Title of Invention	SPRING FIXING STRUCTURE OF RECIPROCATING COMPRESSOR
Abstract	Disclosed is a spring fixing structure of a reciprocating compressor. A spring fixing portion having an inclination surface at an entrance side therof is provided at a frame unit and a mover to which both end portion of a resonant movement of a piston are fixed or at the frame unit and a spring supporter coupled to the mover, and an end portion of the resonant spring is coupled to the spring fixing portion. According to this, the resonant spring is easily fixed and as assembly work is easily fixed and facilitated due to a precise assembly tolerance.

Title of Invention

SPRING FIXING STRUCTURE OF RECIPROCATING COMPRESSOR

Abstract

Disclosed is a spring fixing structure of a reciprocating compressor. A spring fixing portion having an inclination surface at an entrance side therof is provided at a frame unit and a mover to which both end portion of a resonant movement of a piston are fixed or at the frame unit and a spring supporter coupled to the mover, and an end portion of the resonant spring is coupled to the spring fixing portion. According to this, the resonant spring is easily fixed and as assembly work is easily fixed and facilitated due to a precise assembly tolerance.

Full Text	[1] The present invention relates to a reciprocating compressor, and more partkularly, to a spring fixing structure of a reciprocating compressor capable of easily and precisely fixing a resonant spring for causing a resonant movement of a piston and capable of facilitating an assembly work by a precise assembly tolerance. Background Art [2] Generally, a compressor converts an electric energy into a kinetic energy, and compresses a refrigerant by the kinetic energy. The compressor is a core factor con- stituting a refrigerating cjcle system, and is divided into a rotary compressor, a scroll compressor, a reciprocating compressor, and etc. according to a compression mechanism for compressing a refrigerant [3] Figure 1 is a sectional view showing one embodiment of a reciprocating compressor. [4] As shown, the reciprocating compressor comprises: a casing 100 provided with a gas siction pipe 110 and a discharge pipe 120; a frame unit 200 disposed inside the casing 100; a driving motor 300 mounted at the frame unit 200 for generating a linear reciprocation force; a compression unit 400 for compressing gas by receiving the driving force of the driving motor 300; and a resonant spring unit 500 for resonating the driving force of the driving motor 300. [5] The frame unit 200 includes: a front frame 210 accommodating the compression unit 400 therein; a middle frame 220 coupled to the front frame 210; and a rear frame 230 for fixing the driving motor 300 with the middle frame 220. [6] The driving motor 300 includes: an outer stator 310 fixed between the middle frame 220 and the rear frame 230; an inner stator 320 inserted into the outer stator 310 and fixedly coupled to the rear frame 230; a mover 330 movably inserted between the outer stator 310 and the inner stator 320; and a winding coil 340 coupled to inside of the outer stator 310. The mover 330 is composed of a magnet 331, and a magnet holder 332 for supporting the magnet 331. [7] The compression unit 400 includes: a cylinder 410 fixedly coupled to the front frame 210; a piston 420 of which one side is movably inserted into an inner space of the cylinder 410 and another side is fixedly coupled to the mover 330; a discharge WO 2004/081421 2 PCT/KR2004/000507 valve assembly 430 mounted at one side of the cylinder 410 for controlling a discharge of a refrigerant; and a suction valve 440 mounted at the end of the piston 420 for controlling a flow of a refrigerant introduced into the inner space of the cylinder 410. The discharge valve assembly 430includes: a discharge cover 431 for covering the inner space of the cylinder 410; a discharge valve 432 inserted into the discharge cover 431 for opening and closing the inner space of the cylinder 410; and a discharge spring 433 inserted into the discharge cover 431 for elastially supporting the discharge valve 432. [8] The resonant spring unit 500 includes: a spring supporter 510 fixedly coupled to the mover 330; a front coil spring 520 disposed between one side surface of the spring supporter 510 and an inner side surface of the front frame 210; and a rear coil spring 530 disposed between another side surface of the spring supporter 510 and one side surface of the middle frame 220. The front coil spring 520 and the rear coil spring 530 constitute the resonant spring. [9] Operation of the reciprocating compressor will be explained as follows. [10] When a power is supplied to the reciprocating compressor, a linear reciprccation force is generated by an electromagnetic interaction of the driving motor 300. The linear reciprccation force is transmitted to the piston 420 through the mover 330. [11] The piston 420 is linearly-reciprccated in the inner space of the cylinder 410, by the linear reciprccation of the piston 420 and a pressure difference, the suction valve 440 and the discharge valve 432 are operated thus to suck a refrigerant into the inner space of the cylinder 410, compress, and discharge. The discharged refrigerant inside the compression space is exhausted outside the compressor through the discharge cover 431 and the discharge pipe 120. [12] The front coil spring 520 and the rear coil spring 530 respectively disposed at both sides of the piston 420 are contracted and relaxed according to the reciprccation of the piston 420, thereby elastically supporting the piston 420. The front coil spring 520 and the rear coil spring 530 cause the resonant movement of the mover 330 and the piston 420. [13] Said reciprocating compressor is fabricated through a series of assembly processes in a production line. At the time of the assembly processes, an assembly structure and an assembly work of components have to be simplified and facilitated in order to reduce the number of the assembly processes and to obtain more precise assembly dimension. [14] Figure 2 is a sectional view showing a fixing structure of the resonant spring con- WO 2004/081421 3 PCT/KR2004/000507 stituting the reciprocating compressor. [15] As shown, a fixing groove 521 having a certain depth and the same inner diameter as an outer diameter of the front coil spring 520 is formed at an inner side surface of the front frame 210. The fixing groove 521 has a right-angled edge and a*right-angled corner. A fixing protrusion 511 having a certain height and the same outer diameter as an inner diameter of the front coil spring 520 is formed at one surface of the spring supporter 510 facing the fixing groove 521 of the front frame 210, and the fixing protrusion 511 has a right-angled edge and a right-angled corner. One end portion of the front coil spring 520 is inserted into the fixing groove 211 of the front frame, and another end portion thereof is fitted into the fixing protrusion 511 of the spring supporter. An outer surface of said one end portion of the front coil spring 520 is in contact with an inner circumferential surface of the fixing groove 211, and an inner surface of said end portion of the front coil spring 520 is in contact with an outer cir- cumferential surface of the fixing protrusion 511. [16] A fixing groove 221 having a certain depth and the same inner diameter as an outer diameter of the rear coil spring 530 is formed at one surface of the middle frame 220, and the fixing groove 221 has a right-angled edge and a right-angled corner. A fixing protrusion 512 having a certain height and the same outer diameter as an inner diameter of the rear coil spring 530 is formed at one surface of the spring supporter 510 facing the fixing groove 221 of the middle frame 220, and the fixing protrusion 512 has a right-angled edge and a right-angled corner. One end portion of the rear coil spring 530 is inserted into the fixing groove 221 of the middle frame, and another end portion thereof is fitted into the fixing protrusion 512 of the spring supporter. An outer surface of said one end portion of the rear coil spring 530 is in contact with an inner circumferential surface of the fixing groove 221, and an inner surface of said end portion of the rear coil spring 530 is in contact with an outer circumferential surface of the fixing protrusion 512. [17] A plurality of fixing grooves 211 and 221 are respectively formed at the front frame 210 and the middle frame 220, and the fixing protrusions 511 and 512 corresponding to the fixing grooves 211 and 221 are formed at the spring supporter 510. A plurality of the front coil springs 520 and the rear coil springs 530 are respectively coupled to the fixing grooves 211 and 221 and the fixing protrusions 511 and 512. The front coil spring 520 and the rear coil spring 530 have the same size and shape. [18] Since assembly tolerances of the piston 420 and the mover 330 are determined according to assembly tolerances of the front coil spring 520 and the rear coil spring WO 2004/081421 4 PCT/KR2004/000507 530, assembly dimensions between the front and rear coil springs 520 and 530 and the fixing grooves 211 and 221, and between the front and rear coil springs 520 and 530 and the fixing protrusions 511 and 512 have to be precisely maintained. £19] In case that the inner diameters of the fixing grooves 211 and 221 are larger than the outer diameters of the front and rear coil springs 520 and 530 or the outer diameters of the fixing protrusions 511 and 512 are smaller than the inner diameters of the front and rear coil springs 520 and 530, movement widths of the piston 420 and the mover 330 connected to the spring supporter 510 in the circumference direction are great at the time of the compressor operation. According to this, a fictional contact is generated between the piston 420 and the cylinder 410 and between the mover 330 and the outer stator 310/ the inner stator 320 requiring a minute assembly tolerance, thereby lowering a compression function and causing a component damage. [20] R>wever, in the resonant spring unit fixing structure, it is complicated to fix the front and rear coil springs precisely and it is difficult to assemble the components. [21] The reason is because the assembly tolerances between the front/rear coil springs and the counterpart components become minute, the outer diameters of the front/rear coil springs 520/530 are same as the outer diameters of entrance sides of the fixing grooves 211/221 to which the front/rear coil springs 520/530 are coupled, and the inner diameters of the front/rear coil springs 520/530 are same as the outer diameters of entrance sides of the fixing protrusions 511/512. According to this, an assembly pro- ductivity of the compressor is greatly lowered. Disclosure [22] Therefore, an object of the present invention is to provide a spring fixing structure capable of easily and precisely fixing a resonant spring for causing a resonant movement of a piston and capable of facilitating an assembly work by a precise assembly tolerance. [23] To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a spring fixing structure of a reciprocating compressor comprising: a frame unit disposed inside a casing; a driving motor mounted at the frame unit for generating a linear re- ciprocation force; a cylinder fixedly coupled to the frame unit; a piston connected to a mover of the driving motor and linearly-reciprocated in the cylinder by receiving the driving force of the driving motor; and a resonant spring mounted between the mover or a spring supporter coupled to the mover and the frame unit for causing resonant movements of the mover and the piston, in the reciprocating compressor, a spring WO 2004/081421 5 PCT/KR2004/000507 fixing portion having an inclination surface at an entrance side thereof is provided at the frame unit and the mover to which both end portions of the resonant spring are fixed or at the frame unit and a spring supporter coupled to the mover, and an end portion of the resonant spring is coupled to the spring fixing portion. [24] The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanjing drawings. Description of Drawings [25] Figure 1 is a sectional view showing one embodiment of a reciprocating compressor in accordance with the conventional art; [26] Figure 2 is a sectional view showing a fixing stricture of a resonant spring con- stituting the reciprocating compressor; [27] Figure 3 is a sectional view showing a reciprocating compressor provided with one. embodiment of a spring fixing structure of a reciprocating compressor according to the present invention; [28] Figure 4 is a sectional view showing the spring fixing structure of a reciprocating compressor, and [29] Figures 5, 6,7, and 8 are sectional views respectively showing another em- bodiments of the spring fixing structure of a reciprocating compressor according to the present invention. Mode for Invention [30] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the acoompanjing drawings. [31] Figure 3 is a front view showing a reciprocating compressor provided with one embodiment of a spring fixing structure of a reciprocating compressor according to the present invention. The same numerals were given to the same parts as those of the con- ventional art. [32] As shown, the reciprocating compressor comprises: a casing 100 provided with a gas suction pipe 110 and a discharge pipe 120; a frame unit 200 disposed inside the casing 100; a driving motor 300 mounted at the frame unit 200 for generating a linear reciprocation force; a compression unit 400 for compressing gas by receiving the driving force of the driving motor 300; and a resonant spring unit 500 for resonating the driving force of the driving motor 300. The constriction of the reciprocating compressor according to the present invention is same as that of the reciprocating compressor according to the conventional art, thereby omitting explanations for the WO 2004/081421 6 PCT/KR2004/000507 same construction. A resonant spring fixing stricture constituting the resonant spring unit 500 will be explained as follows. [33] The resonant spring unit 500 is composed of a spring supporter 510 fixedly coupled to the mover 330 thus to move with the mover 330, and a resonant spring for elastically supporting the spring supporter 510. The spring supporter 510 is formed as a predetermined shape, and one side thereof is fixedly coupled to the mover 330 and another side thereof is disposed between a front frame 210 and a middle frame 220 constituting the frame unit 200. The resonant spring is constituted with coil springs CS. [34] The plurality of coil springs CS are positioned between an inner side surface of the front frame 210 and one surface of the spring supporter 510, and between another surface of the spring supporter 510 and one surface of the middle frame 510, [35] As shown in Figure 4, a spring fixing portion SF having an inclination surface at an entrance side thereof is provided at the frame unit 210, or the middle frame 220, or the spring supporter 510 to which both end portions of the coil spring CS are fixed, and an end portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 4 shows a case that the coil spring CS is fixed to the middle frame 220. [36] The spring fixing portion SF includes: a cylindrical groove 223 having a certain depth and an inner diameter corresponding to an outer diameter of the coil spring CS; and a guiding inclination surface 224 inclined with a certain inclination angle at the edge of the cylindrral groove 223 so that an inner diameter of an entrance side thereof become greater than the inner diameter of the cylindrical groove 223. [37] The inner diameter of the inner ciraimferential surface of the cylindrral groove is constant The guiding inclination surface 224 starts from an arbitrary position of the inner ciraimferential surface of the cylindrical groove 223. The guiding inclination surface 224 has a conical shape. [38] The coil spring CS is insertion-fixed to the cylindrical groove 223 through the guiding inclination surface 224. Since the coil spring CS is inserted into the cylindrical groove 223 by being guided by the guiding inclination surface 224 of which inner diameter is larger than the inner diameter of the cylindrical groove 223, the assembly work of the coil spring CS is simplified and facilitated. [39] Figure 5 shows another embodiment of the resonant spring fixing structure. [40] As shown, a spring fixing portion SF having an inclination surfxe at an entrance side thereof is provided at the frame unit 210, or the middle frame 220, or the spring supporter 510 to which both end portions of the coil spring CS are fixed, and an end WO 2004/081421 7 PCT/KR2004/000507 portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 5 shows a case that the coil spring CS is fixed to the middle frame 220. [41] The spring fixing portion SF is formed as a conical groove 226 of whfch inner cir- cumferential surface is an inclination surface 225. An inner diameter of a bottom surface of the conical groove 226 corresponds to an outer diameter of the coil spring CS, and an inner diameter of an entrance side of the conical groove 226 is formed to be larger than the inner diameter of the bottom surface thereof. A depth of the conial groove 226 is preferably greater than a wire diameter of the coil spring CS. [42] The coil spring CS is insertion-fixed to the conial groove 226. Since the entrance of the conical groove 226 is greater than the outer diameter of the coil spring CS and is formed as the inclination surface 225, the assembly work of the coil spring CS is simplified and facilitated. [43] Figure 6 shows still another embodiment of the resonant spring fixing stricture. [44] As shown, a spring fixing portion SF having an inclination surface at an entrance side thereof is provided at the frame unit 210, or the middle frame 220, or the spring supporter 510 to which both end portions of the coil spring CS are fixed, and an end portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 6 shows a case that the coil spring CS is fixed to the spring supporter 510. [45] The spring fixing portion SF is composed of a spring fixing protrusion 515 protruded with a certain height and an outer diameter corresponding to the inner diameter of the coil spring CS and having a guiding inclination surface 514 inclined with a certain inclination angle at the protruded edge. [46] The end portion of the coil spring CS is insertion-fixed to the spring fixing protrusion 515. The spring fixing protrusion 515 is disposed inside the coil spring CS, and an axial direction of the coil spring CS and an axial direction of the spring fixing protrusion are positioned on the same line or are parallel each other. [47] The coil spring CS is guided by the guiding inclination surface 514 of which inner diameter is smaller than the inner diameter of the coil spring CS thus to be coupled to the spring fixing protrusion 515 provided with the guiding inclination surface 514, thereby having a simplified and facilitated assembly work of the coil spring CS. [48] Figure 7 shows yet another embodiment of the resonant spring fixing structure. [49] • As shown, a spring fixing portion SF having an inclination surface at an entrance side thereof is provided at the frame unit 210, or the middle frame 220, or the spring supporter 510 to which both end portions of the coil spring CS are fixed, and an end portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 7 shows WO 2004/081421 8 PCT/KR2004/000507 a case that the coil spring CS is fixed to the spring supporter 510. [50] The spring fixing portion SF is composed of a spring fixing protrusion 517 protruded with a certain height and an outer diameter corresponding to the inner diameter of the coil spring CS and having a guiding inclination surface 516 of a hemi- spherral shape at the protruded edge. [51] The end portion of the coil spring CS is insertion-fixed to the spring fixing protrusion 517. The spring fixing protrusion 517 is disposed inside the coil spring CS. [52] Since the coil spring CS is guided by the guiding inclination surface 516 of a hemi- spherical shape of which inner diameter is smaller than the inner diameter of the coil spring CS thus to be coupled to the spring fixing protrusion 517 provided with the guiding inclination surface 516, the assembly work of the coil spring CS is simplified and facilitated. [53] A plurality of the aforementioned resonant spring fixing strictures are respectively provided at both side surfaces of the spring supporter 510, and the front frame 210 and the middle frame 220 facing said both side surfaces of the spring supporter 510. [54] Only the spring fixing portion SF of a protrusion shape, or only the spring fixing portion SF of a groove shape, or both said spring fixing portion SF of a protrusion shape and said spring fixing portion SF of a groove shape can be formed at the spring supporter 510, the front frame 210, and the middle frame 220, respectively. [55] The spring fixing portion SF of a protrusion shape is preferably applied to components having a relatively thin thickness, and the spring tixing portion SF of a groove shape is preferably applied to components having a relatively thick thickness. [56] Figure 8 shows still yet another embodiment of the spring fixing stricture of a re- ciprocating compressor according to the present invention. [57] As shown, a spring fixing protrusion 515 having a guiding inclination surface 514 at an entrance side thereof is formed at the spring supporter 510, a spring fixing groove 223 having a guiding inclination surface 224 at an entrance side thereof is formed at the frame unit 200 facing the spring fixing protrusion of the spring supporter 510, and both end portions of the coil spring CS constituting the resonant spring are fixedly coupled to the spring fixing protrusion 515 and the spring fixing groove 223. Figure 8 shows a case that the coil spring CS is coupled between the spring supporter 510 and the middle frame 220. [58] The spring fixing protrusion 515, as aforementioned, is extendingly-protruded at one surface of the spring supporter 510, and the outer diameter thereof is the same as the inner diameter of the coil spring CS. The guiding inclination surface 514 is formed WO 2004/081421 9 PCT/KR2004/000507 at an edge of the protruded part. [59] The spring fixing groove 223 is formed at one surface of the front frame 210 or the middle frame 220 facing the spring supporter S10, and the inner diameter of the spring fixing groove 223 is the same as the outer diameter of the ooil spring CS constituting the resonant spring. The guiding inclination surface 224 is formed to have a certain in- clination angle at the edge of the entrance side of the groove. [60] One side of the coil spring CS constituting the resonant spring is fixed to the spring fixing protrusion 515 by being introduced along the guiding inclination surface 514 of the spring fixing protrusion, and another side of the coil spring CS is fixed to the spring fixing groove 223 by being introduced along the guiding inclination surface 224 of the spring fixing groove 223. At this time, since both sides of the ooil spring CS are guided by the guiding inclination surface 514 of which inner diameter is smaller than that of the coil spring CS and by the guiding inclination surface 224 of which outer diameter is larger than that of the ooil spring CS thus to be coupled to the spring fixing protrusion 515 and the spring fixing groove 223, the assembly work of the resonant spring is simplified and facilitated. [61] A reciprocating compressor can be divided into various types of which one is the aforementioned reciprocating compressor. In a reciprocating compressor that a driving motor 300 is positioned at the same direction as a piston 420 and the piston 420 is disposed inside the driving motor 300, a resonant spring is respectively disposed at both sides of the piston 420. In this case, a position that the resonant spring is fixedly- coupled is varied. The present invention can be applied to this case, too. [62] As aforementioned, in the spring fixing structure of the redprocating compressor according to the present invention, when the resonant spring is fixedly-coupled to the spring supporter, or the front frame, or the middle frame, the resonant spring is guided by the guiding inclination surface of which inner diameter is smaller than that of the resonant spring or of which outer diameter is larger than that of the resonant spring thus to be fixedlycoupled. Therefore, the fixing and coupling work of the resonant spring is simple and easy, thereby easily assembling two components. [63] According to this, the resonant springs are respectively coupled to the spring supporter, and the assembly that the resonant springs and the spring supporter are integrally assembled is used as one component at the time of an assembly work, thereby decreasing assembly processes. [64] Since it is simple to set the assembly position precisely and to assemble two components, a dimension of a part to which the resonant spring is finally fixed can be WO 2004/081421 10 PCT/KR2004/000507 'more minute and an assembly dimension with the resonant spring can be maintained more minutely. According to this, assembly dimensions of the piston ad the mover supported by the resonant spring and the spring supporter can be more minutely maintained. [65] Since the assembly dimension of the piston can be more minutely maintained, an abrasion between the piston and the cylinder is decreased and a compression leakage is prevented thus to enhance a compression function. [66] Also, since the assembly dimension of the mover is more minutely maintained, an abrasion between the mover and the inner/outer stators is prevented and an interval between the outer stator and the inner stator to which the mover is inserted is decreased thus to enhance a function of the driving motor. [67] As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing de- scription, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modi- fications that fall within the metes and bounds of the claims, or equivalence of sich metes and bounds are therefore intended to be embraced by the appended claims. WO 2004/081421 11 PCT/KR2004/000507 Claims [1] A spring fixing structure of a reciprocating compressor comprising: a frame unit disposed inside a casing; a driving motor mounted at the frame unit for generating a linear reciprocation force; a cylinder fixedly coupled to the frame unit; a piston connected to a mover of the driving motor and linearly-reciprocated in the cylinder by receiving the driving force of the driving motor, and a resonant spring mounted between the mover or a spring supporter coupled to the mover and the frame unit for causing resonant movements of the mover and the piston, in the reciprocating compressor, a spring fixing portion having an inclination surface at an entrance side thereof is provided at the frame unit and the mover to which both end portions of the resonant spring are fixed or at the frame unit and a spring supporter coupled to the mover, and an end portion of the resonant spring is coupled to the spring fixing portion. [2] The spring fixing structure of claim 1, wherein the spring fixing portion includes: a cylindrical groove having a certain depth and an inner diameter corresponding to an outer diameter of the resonant spring; and a guiding inclination surface inclined with a certain inclination angle at an edge of the cylindrical groove so that an inner diameter of an entrance side thereof become greater than the inner diameter of the cylindrical groove. [3] The spring fixing structure of claim 2, wherein the guiding inclination surface starts from an arbitrary position of the cylindrical groove. [4] The spring fixing structure of claim 1, wherein the spring fixing portion is formed as a conical groove of which inner circumferential surfxe is an in- clination surface, an inner diameter of a bottom surface of the conical groove corresponds to an outer diameter of the resonant spring, and an inner diameter of an entrance side of the conical groove is formed to be larger than the inner diameter of the bottom surface thereof. [5] The spring fixing stricture of claim 4, wherein a depth of the conical groove is greater than a wire diameter of the resonant spring. [6] The spring fixing structure of claim 1, wherein the spring fixing portion is protruded with a certain height and an outer diameter corresponding to the inner WO 2004/081421 12 PCT/KR2004/000507 diameter of the resonant spring and is provided with a guiding inclination surface inclined with a certain inclination angle at the protruded edge. [7] The spring fixing structure of claim 1, wherein the spring fixing portion is protruded with a certain height and an outer diameter corresponding to the inner diameter of the resonant spring and is provided with a guiding inclination surface of a hemispherical shape at the protruded edge. [8] A spring fixing stricture of a reciprocating compressor comprising: a frame unit disposed inside a casing; a driving motor mounted at the frame unit for generating a linear reciprocation force; a cylinder fixedly coupled to the frame unit; a piston connected to a mover of the driving motor and linearly-reciprocated in the cylinder by receiving the driving force of the driving motor; and a resonant spring mounted between the mover or a spring supporter coupled to the mover and the frame unit for causing resonant movements of the mover and the piston, in the reciprocating compressor, a spring fixing protrusion having a guiding inclination surface at an entrance side thereof is formed at the spring supporter, a spring fixing groove having a guiding inclination surface at an entrance side thereof is formed at the frame unit facing the spring fixing protrusion of the spring supporter, and both end portions of the resonant spring are fixedly coupled to the spring fixing protrusion and the spring fixing groove. [9] The spring fixing structure of claim 8, wherein an outer diameter of the spring fixing protrusion is the same as an inner diameter of the resonant spring. [10] The spring fixing structure of claim 8, wherein an inner diameter of the spring fixing groove is the same as an outer diameter of the resonant spring. Disclosed is a spring fixing structure of a reciprocating compressor. A spring fixing portion having an inclination surface at an entrance side therof is provided at a frame unit and a mover to which both end portion of a resonant movement of a piston are fixed or at the frame unit and a spring supporter coupled to the mover, and an end portion of the resonant spring is coupled to the spring fixing portion. According to this, the resonant spring is easily fixed and as assembly work is easily fixed and facilitated due to a precise assembly tolerance.

Full Text

[1] The present invention relates to a reciprocating compressor, and more partkularly,
to a spring fixing structure of a reciprocating compressor capable of easily and
precisely fixing a resonant spring for causing a resonant movement of a piston and
capable of facilitating an assembly work by a precise assembly tolerance.
Background Art
[2] Generally, a compressor converts an electric energy into a kinetic energy, and
compresses a refrigerant by the kinetic energy. The compressor is a core factor con-
stituting a refrigerating cjcle system, and is divided into a rotary compressor, a scroll
compressor, a reciprocating compressor, and etc. according to a compression
mechanism for compressing a refrigerant
[3] Figure 1 is a sectional view showing one embodiment of a reciprocating
compressor.
[4] As shown, the reciprocating compressor comprises: a casing 100 provided with a
gas siction pipe 110 and a discharge pipe 120; a frame unit 200 disposed inside the
casing 100; a driving motor 300 mounted at the frame unit 200 for generating a linear
reciprocation force; a compression unit 400 for compressing gas by receiving the
driving force of the driving motor 300; and a resonant spring unit 500 for resonating
the driving force of the driving motor 300.
[5] The frame unit 200 includes: a front frame 210 accommodating the compression
unit 400 therein; a middle frame 220 coupled to the front frame 210; and a rear frame
230 for fixing the driving motor 300 with the middle frame 220.
[6] The driving motor 300 includes: an outer stator 310 fixed between the middle frame
220 and the rear frame 230; an inner stator 320 inserted into the outer stator 310 and
fixedly coupled to the rear frame 230; a mover 330 movably inserted between the outer
stator 310 and the inner stator 320; and a winding coil 340 coupled to inside of the
outer stator 310. The mover 330 is composed of a magnet 331, and a magnet holder
332 for supporting the magnet 331.
[7] The compression unit 400 includes: a cylinder 410 fixedly coupled to the front
frame 210; a piston 420 of which one side is movably inserted into an inner space of
the cylinder 410 and another side is fixedly coupled to the mover 330; a discharge

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valve assembly 430 mounted at one side of the cylinder 410 for controlling a discharge
of a refrigerant; and a suction valve 440 mounted at the end of the piston 420 for
controlling a flow of a refrigerant introduced into the inner space of the cylinder 410.
The discharge valve assembly 430includes: a discharge cover 431 for covering the
inner space of the cylinder 410; a discharge valve 432 inserted into the discharge cover
431 for opening and closing the inner space of the cylinder 410; and a discharge spring
433 inserted into the discharge cover 431 for elastially supporting the discharge valve
432.
[8] The resonant spring unit 500 includes: a spring supporter 510 fixedly coupled to the
mover 330; a front coil spring 520 disposed between one side surface of the spring
supporter 510 and an inner side surface of the front frame 210; and a rear coil spring
530 disposed between another side surface of the spring supporter 510 and one side
surface of the middle frame 220. The front coil spring 520 and the rear coil spring 530
constitute the resonant spring.
[9] Operation of the reciprocating compressor will be explained as follows.
[10] When a power is supplied to the reciprocating compressor, a linear reciprccation
force is generated by an electromagnetic interaction of the driving motor 300. The
linear reciprccation force is transmitted to the piston 420 through the mover 330.
[11] The piston 420 is linearly-reciprccated in the inner space of the cylinder 410, by the
linear reciprccation of the piston 420 and a pressure difference, the suction valve 440
and the discharge valve 432 are operated thus to suck a refrigerant into the inner space
of the cylinder 410, compress, and discharge. The discharged refrigerant inside the
compression space is exhausted outside the compressor through the discharge cover
431 and the discharge pipe 120.
[12] The front coil spring 520 and the rear coil spring 530 respectively disposed at both
sides of the piston 420 are contracted and relaxed according to the reciprccation of the
piston 420, thereby elastically supporting the piston 420. The front coil spring 520 and
the rear coil spring 530 cause the resonant movement of the mover 330 and the piston
420.
[13] Said reciprocating compressor is fabricated through a series of assembly processes
in a production line. At the time of the assembly processes, an assembly structure and
an assembly work of components have to be simplified and facilitated in order to
reduce the number of the assembly processes and to obtain more precise assembly
dimension.
[14] Figure 2 is a sectional view showing a fixing structure of the resonant spring con-

WO 2004/081421 3 PCT/KR2004/000507
stituting the reciprocating compressor.
[15] As shown, a fixing groove 521 having a certain depth and the same inner diameter
as an outer diameter of the front coil spring 520 is formed at an inner side surface of
the front frame 210. The fixing groove 521 has a right-angled edge and a*right-angled
corner. A fixing protrusion 511 having a certain height and the same outer diameter as
an inner diameter of the front coil spring 520 is formed at one surface of the spring
supporter 510 facing the fixing groove 521 of the front frame 210, and the fixing
protrusion 511 has a right-angled edge and a right-angled corner. One end portion of
the front coil spring 520 is inserted into the fixing groove 211 of the front frame, and
another end portion thereof is fitted into the fixing protrusion 511 of the spring
supporter. An outer surface of said one end portion of the front coil spring 520 is in
contact with an inner circumferential surface of the fixing groove 211, and an inner
surface of said end portion of the front coil spring 520 is in contact with an outer cir-
cumferential surface of the fixing protrusion 511.
[16] A fixing groove 221 having a certain depth and the same inner diameter as an outer
diameter of the rear coil spring 530 is formed at one surface of the middle frame 220,
and the fixing groove 221 has a right-angled edge and a right-angled corner. A fixing
protrusion 512 having a certain height and the same outer diameter as an inner
diameter of the rear coil spring 530 is formed at one surface of the spring supporter
510 facing the fixing groove 221 of the middle frame 220, and the fixing protrusion
512 has a right-angled edge and a right-angled corner. One end portion of the rear coil
spring 530 is inserted into the fixing groove 221 of the middle frame, and another end
portion thereof is fitted into the fixing protrusion 512 of the spring supporter. An outer
surface of said one end portion of the rear coil spring 530 is in contact with an inner
circumferential surface of the fixing groove 221, and an inner surface of said end
portion of the rear coil spring 530 is in contact with an outer circumferential surface of
the fixing protrusion 512.
[17] A plurality of fixing grooves 211 and 221 are respectively formed at the front frame
210 and the middle frame 220, and the fixing protrusions 511 and 512 corresponding
to the fixing grooves 211 and 221 are formed at the spring supporter 510. A plurality
of the front coil springs 520 and the rear coil springs 530 are respectively coupled to
the fixing grooves 211 and 221 and the fixing protrusions 511 and 512. The front coil
spring 520 and the rear coil spring 530 have the same size and shape.
[18] Since assembly tolerances of the piston 420 and the mover 330 are determined
according to assembly tolerances of the front coil spring 520 and the rear coil spring

WO 2004/081421 4 PCT/KR2004/000507
530, assembly dimensions between the front and rear coil springs 520 and 530 and the
fixing grooves 211 and 221, and between the front and rear coil springs 520 and 530
and the fixing protrusions 511 and 512 have to be precisely maintained.
£19] In case that the inner diameters of the fixing grooves 211 and 221 are larger than
the outer diameters of the front and rear coil springs 520 and 530 or the outer
diameters of the fixing protrusions 511 and 512 are smaller than the inner diameters of
the front and rear coil springs 520 and 530, movement widths of the piston 420 and the
mover 330 connected to the spring supporter 510 in the circumference direction are
great at the time of the compressor operation. According to this, a fictional contact is
generated between the piston 420 and the cylinder 410 and between the mover 330 and
the outer stator 310/ the inner stator 320 requiring a minute assembly tolerance,
thereby lowering a compression function and causing a component damage.
[20] R>wever, in the resonant spring unit fixing structure, it is complicated to fix the
front and rear coil springs precisely and it is difficult to assemble the components.
[21] The reason is because the assembly tolerances between the front/rear coil springs
and the counterpart components become minute, the outer diameters of the front/rear
coil springs 520/530 are same as the outer diameters of entrance sides of the fixing
grooves 211/221 to which the front/rear coil springs 520/530 are coupled, and the inner
diameters of the front/rear coil springs 520/530 are same as the outer diameters of
entrance sides of the fixing protrusions 511/512. According to this, an assembly pro-
ductivity of the compressor is greatly lowered.
Disclosure
[22] Therefore, an object of the present invention is to provide a spring fixing structure
capable of easily and precisely fixing a resonant spring for causing a resonant
movement of a piston and capable of facilitating an assembly work by a precise
assembly tolerance.
[23] To achieve these and other advantages and in accordance with the purpose of the
present invention, as embodied and broadly described herein, there is provided a spring
fixing structure of a reciprocating compressor comprising: a frame unit disposed inside
a casing; a driving motor mounted at the frame unit for generating a linear re-
ciprocation force; a cylinder fixedly coupled to the frame unit; a piston connected to a
mover of the driving motor and linearly-reciprocated in the cylinder by receiving the
driving force of the driving motor; and a resonant spring mounted between the mover
or a spring supporter coupled to the mover and the frame unit for causing resonant
movements of the mover and the piston, in the reciprocating compressor, a spring

WO 2004/081421 5 PCT/KR2004/000507
fixing portion having an inclination surface at an entrance side thereof is provided at
the frame unit and the mover to which both end portions of the resonant spring are
fixed or at the frame unit and a spring supporter coupled to the mover, and an end
portion of the resonant spring is coupled to the spring fixing portion.
[24] The foregoing and other objects, features, aspects and advantages of the present
invention will become more apparent from the following detailed description of the
present invention when taken in conjunction with the accompanjing drawings.
Description of Drawings
[25] Figure 1 is a sectional view showing one embodiment of a reciprocating
compressor in accordance with the conventional art;
[26] Figure 2 is a sectional view showing a fixing stricture of a resonant spring con-
stituting the reciprocating compressor;
[27] Figure 3 is a sectional view showing a reciprocating compressor provided with one.
embodiment of a spring fixing structure of a reciprocating compressor according to the
present invention;
[28] Figure 4 is a sectional view showing the spring fixing structure of a reciprocating
compressor, and
[29] Figures 5, 6,7, and 8 are sectional views respectively showing another em-
bodiments of the spring fixing structure of a reciprocating compressor according to the
present invention.
Mode for Invention
[30] Reference will now be made in detail to the preferred embodiments of the present
invention, examples of which are illustrated in the acoompanjing drawings.
[31] Figure 3 is a front view showing a reciprocating compressor provided with one
embodiment of a spring fixing structure of a reciprocating compressor according to the
present invention. The same numerals were given to the same parts as those of the con-
ventional art.
[32] As shown, the reciprocating compressor comprises: a casing 100 provided with a
gas suction pipe 110 and a discharge pipe 120; a frame unit 200 disposed inside the
casing 100; a driving motor 300 mounted at the frame unit 200 for generating a linear
reciprocation force; a compression unit 400 for compressing gas by receiving the
driving force of the driving motor 300; and a resonant spring unit 500 for resonating
the driving force of the driving motor 300. The constriction of the reciprocating
compressor according to the present invention is same as that of the reciprocating
compressor according to the conventional art, thereby omitting explanations for the

WO 2004/081421 6 PCT/KR2004/000507
same construction. A resonant spring fixing stricture constituting the resonant spring
unit 500 will be explained as follows.
[33] The resonant spring unit 500 is composed of a spring supporter 510 fixedly coupled
to the mover 330 thus to move with the mover 330, and a resonant spring for
elastically supporting the spring supporter 510. The spring supporter 510 is formed as
a predetermined shape, and one side thereof is fixedly coupled to the mover 330 and
another side thereof is disposed between a front frame 210 and a middle frame 220
constituting the frame unit 200. The resonant spring is constituted with coil springs
CS.
[34] The plurality of coil springs CS are positioned between an inner side surface of the
front frame 210 and one surface of the spring supporter 510, and between another
surface of the spring supporter 510 and one surface of the middle frame 510,
[35] As shown in Figure 4, a spring fixing portion SF having an inclination surface at an
entrance side thereof is provided at the frame unit 210, or the middle frame 220, or the
spring supporter 510 to which both end portions of the coil spring CS are fixed, and an
end portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 4
shows a case that the coil spring CS is fixed to the middle frame 220.
[36] The spring fixing portion SF includes: a cylindrical groove 223 having a certain
depth and an inner diameter corresponding to an outer diameter of the coil spring CS;
and a guiding inclination surface 224 inclined with a certain inclination angle at the
edge of the cylindrral groove 223 so that an inner diameter of an entrance side thereof
become greater than the inner diameter of the cylindrical groove 223.
[37] The inner diameter of the inner ciraimferential surface of the cylindrral groove is
constant The guiding inclination surface 224 starts from an arbitrary position of the
inner ciraimferential surface of the cylindrical groove 223. The guiding inclination
surface 224 has a conical shape.
[38] The coil spring CS is insertion-fixed to the cylindrical groove 223 through the
guiding inclination surface 224. Since the coil spring CS is inserted into the cylindrical
groove 223 by being guided by the guiding inclination surface 224 of which inner
diameter is larger than the inner diameter of the cylindrical groove 223, the assembly
work of the coil spring CS is simplified and facilitated.
[39] Figure 5 shows another embodiment of the resonant spring fixing structure.
[40] As shown, a spring fixing portion SF having an inclination surfxe at an entrance
side thereof is provided at the frame unit 210, or the middle frame 220, or the spring
supporter 510 to which both end portions of the coil spring CS are fixed, and an end

WO 2004/081421 7 PCT/KR2004/000507
portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 5 shows
a case that the coil spring CS is fixed to the middle frame 220.
[41] The spring fixing portion SF is formed as a conical groove 226 of whfch inner cir-
cumferential surface is an inclination surface 225. An inner diameter of a bottom
surface of the conical groove 226 corresponds to an outer diameter of the coil spring
CS, and an inner diameter of an entrance side of the conical groove 226 is formed to be
larger than the inner diameter of the bottom surface thereof. A depth of the conial
groove 226 is preferably greater than a wire diameter of the coil spring CS.
[42] The coil spring CS is insertion-fixed to the conial groove 226. Since the entrance
of the conical groove 226 is greater than the outer diameter of the coil spring CS and is
formed as the inclination surface 225, the assembly work of the coil spring CS is
simplified and facilitated.
[43] Figure 6 shows still another embodiment of the resonant spring fixing stricture.
[44] As shown, a spring fixing portion SF having an inclination surface at an entrance
side thereof is provided at the frame unit 210, or the middle frame 220, or the spring
supporter 510 to which both end portions of the coil spring CS are fixed, and an end
portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 6 shows
a case that the coil spring CS is fixed to the spring supporter 510.
[45] The spring fixing portion SF is composed of a spring fixing protrusion 515
protruded with a certain height and an outer diameter corresponding to the inner
diameter of the coil spring CS and having a guiding inclination surface 514 inclined
with a certain inclination angle at the protruded edge.
[46] The end portion of the coil spring CS is insertion-fixed to the spring fixing
protrusion 515. The spring fixing protrusion 515 is disposed inside the coil spring CS,
and an axial direction of the coil spring CS and an axial direction of the spring fixing
protrusion are positioned on the same line or are parallel each other.
[47] The coil spring CS is guided by the guiding inclination surface 514 of which inner
diameter is smaller than the inner diameter of the coil spring CS thus to be coupled to
the spring fixing protrusion 515 provided with the guiding inclination surface 514,
thereby having a simplified and facilitated assembly work of the coil spring CS.
[48] Figure 7 shows yet another embodiment of the resonant spring fixing structure.
[49] • As shown, a spring fixing portion SF having an inclination surface at an entrance
side thereof is provided at the frame unit 210, or the middle frame 220, or the spring
supporter 510 to which both end portions of the coil spring CS are fixed, and an end
portion of the coil spring CS is coupled to the spring fixing portion SF. Figure 7 shows

WO 2004/081421 8 PCT/KR2004/000507
a case that the coil spring CS is fixed to the spring supporter 510.
[50] The spring fixing portion SF is composed of a spring fixing protrusion 517
protruded with a certain height and an outer diameter corresponding to the inner
diameter of the coil spring CS and having a guiding inclination surface 516 of a hemi-
spherral shape at the protruded edge.
[51] The end portion of the coil spring CS is insertion-fixed to the spring fixing
protrusion 517. The spring fixing protrusion 517 is disposed inside the coil spring CS.
[52] Since the coil spring CS is guided by the guiding inclination surface 516 of a hemi-
spherical shape of which inner diameter is smaller than the inner diameter of the coil
spring CS thus to be coupled to the spring fixing protrusion 517 provided with the
guiding inclination surface 516, the assembly work of the coil spring CS is simplified
and facilitated.
[53] A plurality of the aforementioned resonant spring fixing strictures are respectively
provided at both side surfaces of the spring supporter 510, and the front frame 210 and
the middle frame 220 facing said both side surfaces of the spring supporter 510.
[54] Only the spring fixing portion SF of a protrusion shape, or only the spring fixing
portion SF of a groove shape, or both said spring fixing portion SF of a protrusion
shape and said spring fixing portion SF of a groove shape can be formed at the spring
supporter 510, the front frame 210, and the middle frame 220, respectively.
[55] The spring fixing portion SF of a protrusion shape is preferably applied to
components having a relatively thin thickness, and the spring tixing portion SF of a
groove shape is preferably applied to components having a relatively thick thickness.
[56] Figure 8 shows still yet another embodiment of the spring fixing stricture of a re-
ciprocating compressor according to the present invention.
[57] As shown, a spring fixing protrusion 515 having a guiding inclination surface 514
at an entrance side thereof is formed at the spring supporter 510, a spring fixing groove
223 having a guiding inclination surface 224 at an entrance side thereof is formed at
the frame unit 200 facing the spring fixing protrusion of the spring supporter 510, and
both end portions of the coil spring CS constituting the resonant spring are fixedly
coupled to the spring fixing protrusion 515 and the spring fixing groove 223. Figure 8
shows a case that the coil spring CS is coupled between the spring supporter 510 and
the middle frame 220.
[58] The spring fixing protrusion 515, as aforementioned, is extendingly-protruded at
one surface of the spring supporter 510, and the outer diameter thereof is the same as
the inner diameter of the coil spring CS. The guiding inclination surface 514 is formed

WO 2004/081421 9 PCT/KR2004/000507
at an edge of the protruded part.
[59] The spring fixing groove 223 is formed at one surface of the front frame 210 or the
middle frame 220 facing the spring supporter S10, and the inner diameter of the spring
fixing groove 223 is the same as the outer diameter of the ooil spring CS constituting
the resonant spring. The guiding inclination surface 224 is formed to have a certain in-
clination angle at the edge of the entrance side of the groove.
[60] One side of the coil spring CS constituting the resonant spring is fixed to the spring
fixing protrusion 515 by being introduced along the guiding inclination surface 514 of
the spring fixing protrusion, and another side of the coil spring CS is fixed to the
spring fixing groove 223 by being introduced along the guiding inclination surface 224
of the spring fixing groove 223. At this time, since both sides of the ooil spring CS are
guided by the guiding inclination surface 514 of which inner diameter is smaller than
that of the coil spring CS and by the guiding inclination surface 224 of which outer
diameter is larger than that of the ooil spring CS thus to be coupled to the spring fixing
protrusion 515 and the spring fixing groove 223, the assembly work of the resonant
spring is simplified and facilitated.
[61] A reciprocating compressor can be divided into various types of which one is the
aforementioned reciprocating compressor. In a reciprocating compressor that a driving
motor 300 is positioned at the same direction as a piston 420 and the piston 420 is
disposed inside the driving motor 300, a resonant spring is respectively disposed at
both sides of the piston 420. In this case, a position that the resonant spring is fixedly-
coupled is varied. The present invention can be applied to this case, too.
[62] As aforementioned, in the spring fixing structure of the redprocating compressor
according to the present invention, when the resonant spring is fixedly-coupled to the
spring supporter, or the front frame, or the middle frame, the resonant spring is guided
by the guiding inclination surface of which inner diameter is smaller than that of the
resonant spring or of which outer diameter is larger than that of the resonant spring
thus to be fixedlycoupled. Therefore, the fixing and coupling work of the resonant
spring is simple and easy, thereby easily assembling two components.
[63] According to this, the resonant springs are respectively coupled to the spring
supporter, and the assembly that the resonant springs and the spring supporter are
integrally assembled is used as one component at the time of an assembly work,
thereby decreasing assembly processes.
[64] Since it is simple to set the assembly position precisely and to assemble two
components, a dimension of a part to which the resonant spring is finally fixed can be

WO 2004/081421 10 PCT/KR2004/000507
'more minute and an assembly dimension with the resonant spring can be maintained
more minutely. According to this, assembly dimensions of the piston ad the mover
supported by the resonant spring and the spring supporter can be more minutely
maintained.
[65] Since the assembly dimension of the piston can be more minutely maintained, an
abrasion between the piston and the cylinder is decreased and a compression leakage is
prevented thus to enhance a compression function.
[66] Also, since the assembly dimension of the mover is more minutely maintained, an
abrasion between the mover and the inner/outer stators is prevented and an interval
between the outer stator and the inner stator to which the mover is inserted is
decreased thus to enhance a function of the driving motor.
[67] As the present invention may be embodied in several forms without departing from
the spirit or essential characteristics thereof, it should also be understood that the
above-described embodiments are not limited by any of the details of the foregoing de-
scription, unless otherwise specified, but rather should be construed broadly within its
spirit and scope as defined in the appended claims, and therefore all changes and modi-
fications that fall within the metes and bounds of the claims, or equivalence of sich
metes and bounds are therefore intended to be embraced by the appended claims.

WO 2004/081421 11 PCT/KR2004/000507
Claims
[1] A spring fixing structure of a reciprocating compressor comprising:
a frame unit disposed inside a casing;
a driving motor mounted at the frame unit for generating a linear reciprocation
force;
a cylinder fixedly coupled to the frame unit;
a piston connected to a mover of the driving motor and linearly-reciprocated in
the cylinder by receiving the driving force of the driving motor, and
a resonant spring mounted between the mover or a spring supporter coupled to
the mover and the frame unit for causing resonant movements of the mover and
the piston, in the reciprocating compressor,
a spring fixing portion having an inclination surface at an entrance side thereof is
provided at the frame unit and the mover to which both end portions of the
resonant spring are fixed or at the frame unit and a spring supporter coupled to
the mover, and an end portion of the resonant spring is coupled to the spring
fixing portion.
[2] The spring fixing structure of claim 1, wherein the spring fixing portion includes:
a cylindrical groove having a certain depth and an inner diameter corresponding
to an outer diameter of the resonant spring; and
a guiding inclination surface inclined with a certain inclination angle at an edge
of the cylindrical groove so that an inner diameter of an entrance side thereof
become greater than the inner diameter of the cylindrical groove.
[3] The spring fixing structure of claim 2, wherein the guiding inclination surface
starts from an arbitrary position of the cylindrical groove.
[4] The spring fixing structure of claim 1, wherein the spring fixing portion is
formed as a conical groove of which inner circumferential surfxe is an in-
clination surface, an inner diameter of a bottom surface of the conical groove
corresponds to an outer diameter of the resonant spring, and an inner diameter of
an entrance side of the conical groove is formed to be larger than the inner
diameter of the bottom surface thereof.
[5] The spring fixing stricture of claim 4, wherein a depth of the conical groove is
greater than a wire diameter of the resonant spring.
[6] The spring fixing structure of claim 1, wherein the spring fixing portion is
protruded with a certain height and an outer diameter corresponding to the inner

WO 2004/081421 12 PCT/KR2004/000507
diameter of the resonant spring and is provided with a guiding inclination surface
inclined with a certain inclination angle at the protruded edge.
[7] The spring fixing structure of claim 1, wherein the spring fixing portion is
protruded with a certain height and an outer diameter corresponding to the inner
diameter of the resonant spring and is provided with a guiding inclination surface
of a hemispherical shape at the protruded edge.
[8] A spring fixing stricture of a reciprocating compressor comprising:
a frame unit disposed inside a casing;
a driving motor mounted at the frame unit for generating a linear reciprocation
force;
a cylinder fixedly coupled to the frame unit;
a piston connected to a mover of the driving motor and linearly-reciprocated in
the cylinder by receiving the driving force of the driving motor; and
a resonant spring mounted between the mover or a spring supporter coupled to
the mover and the frame unit for causing resonant movements of the mover and
the piston, in the reciprocating compressor,
a spring fixing protrusion having a guiding inclination surface at an entrance side
thereof is formed at the spring supporter, a spring fixing groove having a guiding
inclination surface at an entrance side thereof is formed at the frame unit facing
the spring fixing protrusion of the spring supporter, and both end portions of the
resonant spring are fixedly coupled to the spring fixing protrusion and the spring
fixing groove.
[9] The spring fixing structure of claim 8, wherein an outer diameter of the spring
fixing protrusion is the same as an inner diameter of the resonant spring.
[10] The spring fixing structure of claim 8, wherein an inner diameter of the spring
fixing groove is the same as an outer diameter of the resonant spring.

Disclosed is a spring
fixing structure of a reciprocating
compressor. A spring fixing portion
having an inclination surface at an
entrance side therof is provided at a
frame unit and a mover to which both
end portion of a resonant movement
of a piston are fixed or at the frame
unit and a spring supporter coupled to
the mover, and an end portion of the
resonant spring is coupled to the spring
fixing portion. According to this, the
resonant spring is easily fixed and
as assembly work is easily fixed and
facilitated due to a precise assembly
tolerance.

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Patent Number

218992

Indian Patent Application Number

01783/KOLNP/2005

PG Journal Number

16/2008

Publication Date

18-Apr-2008

Grant Date

16-Apr-2008

Date of Filing

07-Sep-2005

Name of Patentee

LG ELECTRONICS INC.

Applicant Address

20,YOIDO-DONG, YONGDUNGPO-GU, SEOUL 150-010, REPUBLIC OF KOREA

Inventors:

#	Inventor's Name	Inventor's Address
1	KIM, JANG-WHAN	GAENARI APT. 408-1305, DAEBANG-DONG, CHANGWON, GYEONGSANGNAM-DO, 641-753, REPUBLIC OF KOREA

PCT International Classification Number

F04B 35/04

PCT International Application Number

PCT/KR2004/000507

PCT International Filing date

2004-03-11

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10-2003-0015210	2003-03-11	Republic of Korea