Title of Invention	CYLINDER SUPPORTING STRUCTURE OF RECIPROCATING COMPRESSOR.
Abstract	In a cylinder supporting structure of a reciprocating compressor for combining a cylinder compressing gas with a franse with a fastening means, by including a bridging portion formed in the cylinder, an axial support extended-projected from the inner circumference of the cylinder, and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferential direction by being contacted-supported by the outer surface of the cylinder, it is possible to prevent deformation of the cylinder and facilitate assembly operation.

Title of Invention

CYLINDER SUPPORTING STRUCTURE OF RECIPROCATING COMPRESSOR.

Abstract

In a cylinder supporting structure of a reciprocating compressor for combining a cylinder compressing gas with a franse with a fastening means, by including a bridging portion formed in the cylinder, an axial support extended-projected from the inner circumference of the cylinder, and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferential direction by being contacted-supported by the outer surface of the cylinder, it is possible to prevent deformation of the cylinder and facilitate assembly operation.

Full Text	WO 2004/081378 1 PCT/KR2004/000508 Description CYLINDER SUPPORTING STRUCTURE OF RE- CIPROCATING COMPRESSOR Technical Field [1] The present invention relates to a reciprocating compressor, and in particular to a cylinder supporting stricture of a reciprocating compressor capable of facilating assembly operation of a cylinder combined with a frame and preventing deformation of the cylinder when the cylinder is fixed-combined with the frame and a discharge cover covering thereon. Background Art [2] Generally, a compressor converts electrc energy into kinetic energy and compresses refrigerant by the kinetic energy. The compressor is the core part, and the compressor can be divided into a rotary compressor, a scroll compressor and a re- ciprocating compressor, etc. according to fluid compression mechanisms. [3] Figure 1 is a sectional view illustrating the reciprocating compressor. As depicted in Figure 1, the reciprocating compressor includes a casing 100 having a gas siction pipe 110 and a discharge pipe 120; a frame unit 200 disposed in the casing 100; a driving motor 300 installed to the frame unit 200 to generate a linear reciprocating driving force; a compression unit 400 for compressing gas by receiving the driving force of the driving motor 300; and a resonance spring unit 500 for resonating the driving force of the driving motor 300. [4] The frame unit 200 includes a front frame 210 for housing the compression unit 400; a middle frame 220 combined with the front frame 210; and a rear frame 230 for fixing the driving motor 300 with the middle frame 220. [5] The driving motor 300 includes an outer stator 310 fixed between the middle frame 220 and the rear frame 230; an inter stator 320 inserted into the outer stator 310 and fixedly combined with the rear frame 230; a mover 330 movably inserted between the outer stator 310 and the inner stator 320; and a wiring coil 340 combined with the outer stator 310. The mover 330 consists of a magnet 331 and a magnetholder332 for supporting the magnet 331. [6] The compression unit 400 includes a cylinder 410 fixedly combined with the front frame 210; a piston 420 in which one end is movably inserted into an inner spase (P) of the cylinder 410 and the other end is fixedly combined with the mover 330; a discharge cover 430 installed to a side of the front frame 210 to cover the inner space WO 2004/081378 2 PCT/KR2004/000508 (P) of the cylinder; a discharge valve 440 disposed in the discharge cover 430 to open/ close the inner space (P) of the cylinder; a discharge spring 450 disposed in the discharge cover 430 to support the discharge valve 440; and a suction valve 460 installed to the end of the piston 420 to control flow of refrigerant sicked into the inner space (P) of the cylinder. [7] Reference numeral 510 is a spring support, 520 is a front coil spring, and 530 is a rear coil spring. [8] Operation of the reciprocating compressor will be described as following. [9] When power is supplied to the reciprocating compressor, a linear reciprocating driving force is generated by electro-magnetic mutual operation of the driving motor 300, and the linear reciprocating driving force is transmitted to the piston 420 through the mover 330. [10] The piston 420 performs a linear reciprocating motion in the inner spare (P) of the cylinder 410, by a pressure difference generated in the inner space (P) of the cylinder 420 according to the linear reciprocating motion, the siction valve 460 and the discharge valve 440 are operated, and accordingly the refrigerant is sicked into the inner space (P) of the cylinder 410, compressed and discharged. The discharged re- frigerant is discharged to the outside through the discharge cover 430 and the discharge pipe 120 combined with the discharge cover 430. [11] By the resonance spring unit 500, the motion of the mover 330 and the piston 420 is resonated. [12] In the meantime, in order to minimize leakage of compression refrigerant between the cylinder 410 and the piston 420 in the operation and improve a compression performance, the cylinder 410 and the piston 420 have to be assembled precisely. In addition, in order to make the piston 420 perform the linear reciprocating motion smoothly in the inner space (P) of the cylinder 410, the cylinder 410 has to be precisely combined to the front frame 210. [13] Figure 2 is an exploded-sectional view illustrating the assembly of the cylinder. [14] As depicted in Figure 2, in the front frame 210, a cylinder insertion hole 212 having a certain inner diameter is pierced-formed at a certain-shaped body portion 211, a ring- shaped oil pocket 213 having a certain width and depth is formed on the inner cir- cumference of the cylinder insertion hole 212, and a mounting portion 214 having a certain depth and outer diameter is formed at an inlet side of the cylinder insertion hole 212. [15] The cylinder 410 is inserted into the cylinder insertion hole 412 of the front frame WO 2004/081378 3 PCT/KR2004/000508 210. The cylinder 410 includes a cylinder portion 411 having a certain length; and a ring-shaped bridging portion 412 extended-projected from the outer circumference of the cylinder portion 411. In the cylinder 410, the cylinder portion 411 is inserted into the cylinder insertion hole 212 of the body portion 211, and the bridging portion 412 is inserted into the mounting portion 214. [16] By the oil pccket 213 and the mounting portion 214 formed at the inner cir- cumference of the cylinder insertion hole 212, relatively projected two portions are formed, one is a front support portion 215, and the other is a rear support portion 216. An inner diameter of the front support portion 215 and the rear support portion 216 is corresponded to an outer diameter of the cylinder portion 411 of the cylinder 410, the front support portion 215 and the rear support portion 216 are contacted to the outer circumference of the cylinder portion 411 of the cylinder 410, and accordingly the cylinder 410 is supported. In addition, an inner diameter of the mounting portion 214 is corresponded to an outer diameter of the bridging portion 412 of the cylinder 410. [17] The discharge cover 430 includes a cap portion 431 having a cap shape; and a flange portion 432 curved-extended from the end of the cap portion 431. [18] In the discharge cover 430, the flange portion 432 is contacted to the end surface 217 of the body portion 211 of the front frame and the side surface 413 of the bridging portion 412 of the cylinder, and the flange portion 432 is combined with the end surface 217 of the body portion 411 of the front frame by plural bolts 10 fastened at the flange portion 432 of the discharge cover. Accordingly, the discharge cover 430 is fixedly combined with the front frame 210. [19] An oil passage 218 in which oil flow into/out of the oil pccket 213 is respectively formed at the front frame 210. [20] The piston 420 is movably inserted into the inner space (P) of the cylinder. [21] Reference numeral 433 is a through hole, and 219 is a screw hole, [22] However, in the above-mentioned stricture, when the plural bolts 10 are fastened in order to combine the discharge cover 430, the front frame 210 and the cylinder 410, a fastening force applied on the bolts 10 is transmitted to the front frame 210. [23] The fastening force transmitted to the front frame 210 acts on the portion at which bolt 10 is combined, due to that, repulsive power may act on the front support portion 215 which is the inner side of the portion at which the bolt 10 is fastened, and twisted force generated in fastening of the bolts 10 may acton the front support portion 215. [24] By the repulsive power and twisted force acting on the front support portion 215, as depbted in Figure 3, deformation occurs at the front support portion 215 supporting WO 2004/081378 4 PCT/KR2004/000508 the cylinder 410, and the deformation force is transmitted to the cylinder 410 contacted with the front support portion 215. By the force transmitted to the cylinder 410, the cylinder 410 may be deformed or error may cccur in assembly size of the cylinder, and accordingly abrasion of the parts may oxur or operation may not be performed smoothly. Disclosure [25] In order to solve the above-mentioned problems, it is an object of the present invention to provide a cylinder supporting stricture of a reciprocating compressor capable of facilitating assembly operation of a cylinder combined with a frame and preventing deformation of the cylinder in combining of a discharge oover for covering the cylinder with the frame. [26] In order to achieve the above-mentioned object, in a reciprocating compressor including a frame having a cylinder insertion hole therein, a cylinder inserted into the cylinder insertion hole of the frame, a piston performing a linear reciprocating motion in the cylinder by receiving a driving force of a driving motor, a discharge cover for covering a side of the cylinder and a fastening means for combining the discharge cover with the frame, a cylinder supporting stricture of a reciprocating compressor includes a bridging portion formed in the cylinder; an axial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the length direction by being supported by the bridging portion of the cylinder, and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferentional direction by being contacted-supported by the outer surface of the cylinder. Description of Drawings [27] Figure 1 is a sectional view illustrating a general reciprocating compressor; [28] Figure 2 is an exploded-sectional view illustrating assembly of a cylinder of the conventional reciprocating compressor; [29] Figure 3 is an enlarged-sectional view illustrating a cylinder supporting stricture of the reciprocating compressor; [30] Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a cylinder supporting stricture of a reciprocating compressor respectively; [31] Figure 6 is a sectional view illustrating a modified example of an axial support of a cylinder supporting structure of the reciprocating compressor in accordance with the present invention; and [32] Figure 7 is a partial-enlarged sectional view illustrating the cylinder supporting WO 2004/081378 5 PCT/KR2004/000508 stricture of the reciprocating compressor in accordance with the present invention. Mode for Invention [33] Hereinafter, the preferred embodiments of the present invention will be described with reference to acompanying drawings. [34] Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a cylinder supporting stricture of a reciprocating compressor respectively. The same parts with the conventional art will have the same reference numerals. [35] As depicted in Figures 4 and 5, a cylinder 410 is inserted into a front frame 240 of a frame unit 200, and a piston 420 is movably inserted into an inner space (P) of the cylinder. And, a discharge cover 430 covers a side of the cylinder 410 and is fixedly combined with the front frame 240 by a fastening means. The fastening means is plural bolts. [36] In the front frame 240, a cylinder insertion hole 242 having a certain inner diameter is formed at a certain-shaped body portion 241. And, a ring-shaped axial support 243 having a certain width and height is formed at the inner circumference of the cylinder insertion hole 242, a ring-shaped radial support 244 having a certain width and height is formed at the inner circuniference of the cylinder insertion hole 242 at a certain internal from the axial support 243, herein the radial support 244 has an inner diameter greater than that of the axial support 243. [37] The axial support 243 is arranged so as to be nearer to the discharge cover 430 in comparison with the radial support 244. The axial support 243 and the radial support 244 are extended-formed on the inner circumference of the cylinder insertion hole 242. [38] The cylinder 410 includes a cylinder unit 411 having a certain length so as to receive a piston 420 therein; and a bridging portion 412 projected from the outer cir- cumference of the cylinder portion 411 so as to have a certain width and height. The bridging portion 412 has a ring shape. [39] An inner diameter of the cylinder insertion hole 242 of the front frame 240 is greater than an outer diameter of the cylinder unit 411 of the cylinder 410, an inner diameter of the radial support 244 of the front frame 240 is the same with an outer diameter of the cylinder unit 411 of the cylinder 410, and an inner diameter of the axial support 243 is smaller than an outer diameter of the cylinder unit 411. [40] In the cylinder 410, the cylinder unit 411 is inserted into the cylinder insertion hole 242 of the front frame 240, a side surface of the bridging portion 412 is contacted to a side surfxe of the axial support 243, and the inner ciraimfercnce of the radial support 244 is contacted to the outer circumference of the cylinder unit 411. By contacting the WO 2004/081378 6 PCT/KR2004/000508 side of the axial support 243 of the front frame 240 to the side of the bridging portion 412, the cylinder 410 is supported in the axial direction, by contacting an inner surface (A) of the radial support 244 of the front frame 240 to the outer circumference of the cylinder unit 411, the cylinder 410 is supported in the radial direction. [41] A width (a) of the radial support 244 is greater than a width (b) of the axial support 243. [42] An oil pocket 245 in which oil circulates is formed in a space between the axial support 243 and the radial support 244. A mounting portion 247 is formed between an inlet of the cylinder insertion hole 242 and a side of the axial support 243. A width (c) (in the length direction) of (he bridging portion 412 is the same with or greater than a distance between the end of the inlet of the cylinder insertion hole 242 of the front frame and a side surface of the axial support 243. An outer diameter of the bridging portion 412 is smaller than an inner diameter of the cylinder insertion hole 242. [43] The discharge cover 430 includes a cap portion 431 having a cap shape and a flange portion 432 curved-extended from the cap portion 431. [44] In the discharge cover 430, the flange portion 432 is contacted to an end surface 246 of the body portion of the front frame and a side of the bridging portion 412 of the cylinder, and plural bolts 10 pierce through holes 433 formed at the flange portion 432 and are respectively fastened to screw holes 248 formed at the end surface 246 of the body portion of the front frame. According lo that, the discharge cover 430 is fixedly combined with the front frame 240, by fastening the plural bolts 10 to the discharge cover 430 and the front frame 240, the cylinder 410 is pressurized-fixed to the discharge cover 430. [45] In the front frame 240, oil passages 249 in which oil flows into/out of the oil pocket 245 are formed. [46] In the discharge cover 430, a discharge valve 440 for opening/closing an inner space (P) of the cylinder and a discharge spring 450 for elastcally supporting the discharge valve 440 are arranged. [47] As depicted in Figure 6, as a modified form of the axial support 243, the axial support 243 consists of plural protrusions (B) extended-formed at the inner wall of the cylinder insertion hole 242 so as to have a certain width, height and length in the cir- cumferential direction. A diameter of a circle formed by the inner surface of the plural protrusions (B) is greater than an outer diameter of the cylinder 410. [48] Hereinafter, advantages of the cylinder supporting stricture of the reciprocating compressor in accordance with the present invention will be described. WO 2004/081378 7 PCT/KR2004/000508 [49] In the present invention, the cylinder 410 combined with the front frame 240 is supported in the axial and radial direction by pressurization of the discharge cover 430, and accordingly a combination state is firm. In more detail, the bridging portion 412 of the cylinder contacts-supports the axial support 243 in the axial direction, the discharge cover 430 pressurizes the cylinder 410 in the axial direction, the radial support 244 of the front frame supports the outer ciraimference of the cylinder portion 411 of the cylinder in the radial direction, and accordingly the combination state of the cylinder 410 is firm. [501 And, when the plural bolts 10 are fastened to combine the discharge cover 430, the front frame 240 and the cylinder 410, the fastening force by the bolts 10 acts on the front frame 240. The fastening force acting on the front frame 240 acts on a portion at which the bolt 10 is combined, axording to that, repulsive power xts on the axial support 243 formed at the inner side of the portion (at which the bolt 10 is combined), and twisted force occurred in fastening of the bolts 10 acts on the axial support 2-6. Hbwever, because the axial support 243 is not contacted to the cylinder portion 411 of the cylinder but maintains a certain interval, the repulsive power and the twisted force act only on the axial support 243 without being transmitted to the cylinder 410. Ac- cordingly, by the fastening of the plural bolts 10, deformation of the cylinder is prevented, by making the fastening force of the bolts 10 acting only in the axial direction of the cylinder 410 through the discharge cover 430, the bridging portion 412 of the cylinder is supported by the axial support 243 in the axial direction, and ac- cordingly the cylinder 410 is fixed. [51] In addition, in the present invention, an inner diameter of the axial support 243 of the front frame is greater than an outer diameter of the cylinder portion 411, when the cylinder 410 is combined with the front frame 240, assembly operation can be simplified. Industrial Applicability [52] As described-above, in the cylinder supporting stricture of the reciprocating compressor in axordance with the present invention, when the cylinder for compressing gas is fixedly combined with the frame, by preventing deformation of the cylinder, the cylinder can maintain a set assembly size, and accordingly it is possible to prevent contact and abrasion between parts in operation and perform the operation smoothly. Therefore, life span of the parts can be extended, and reliability can be improved. [53] In addition, by facilitating assembly operation of the cylinder, assembly pro- WO 2004/081378 8 PCT/KR2004/000508 dictivity can be improved, by maintaining a firm assembly state, collision and noise among the parts can be prevented. WO 2004/081378 9 PCT/KR2004/000508 Claims [1] In a reciprocating compressor including a frame having a cylinder insertion hole therein, a cylinder inserted into the cylinder insertion hole of the frame, a piston performing a linear reciprocating motion in the cylinder by receiving a driving force of a driving motor, a discharge cover for covering a side of the cylinder and a fastening means for combining the discharge cover with the frame, a cylinder supporting stricture of a reciprocating compressor, comprising: a bridging portion formed in the cylinder; an axial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the length direction by being supported by the bridging portion of the cylinder; and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferentional direction by being contasted-supported by the outer surface of the cylinder. [2] The stricture of claim 1, wherein the axial support is formed as a ring shape having a certain width and height, and an inner diameter of the axial support is greater than an outer diameter of the cylinder. [3] The structure of claim 1, wherein the radial support is formed as a ring shape having a certain width and height, and an inner diameter of the radial support is the same with an outer diameter of the cylinder. [4] The stricture of claim 1, wherein a length directional width of the radial support is greater than a length directional width of the axial support. [5] The stricture of claim 1, wherein the bridging portion of the cylinder on the outer circumference of the cylinder is formed as a ring shape having a certain width and height [6] The stricture of claim 5, wherein an outer diameter of the bridging portion is smaller than an inner diameter of the cylinder insertion hole of the frame. [7] The stricture of claim 1, wherein the axial support and the radial support are formed so as to have a certain interval therebetween, and an oil pocket in which oil flows is formed between the axial support and the radial support. [8] The stricture of claim 1, wherein a distance between the inlet end of the cylinder insertion hole of the cylinder and a side of the axial support is less than or the same with a length directional width of the bridging portion of the cylinder. [9] The stricture of claim 1, wherein the cylinder is pressurized-combined with the WO 2004/081378 10 PCT/KR2004/000508 discharge cover by combining the discharge cover and the frame by using the fastening means. [10] The stricture of claim 1, wherein the axial support consists of plural protrusions extended-formed at the inner wall of the cylinder insertion hole of the frame so as to have a certain width, height and circumferential length, and a diameter of a circle formed by the inner surface of the protrusions is greater than an outer diameter of the cylinder. In a cylinder supporting structure of a reciprocating compressor for combining a cylinder compressing gas with a franse with a fastening means, by including a bridging portion formed in the cylinder, an axial support extended-projected from the inner circumference of the cylinder, and a radial support extended-projected from the inner circumference of the cylinder insertion hole of the frame to support the cylinder in the circumferential direction by being contacted-supported by the outer surface of the cylinder, it is possible to prevent deformation of the cylinder and facilitate assembly operation.

Full Text

WO 2004/081378 1 PCT/KR2004/000508
Description
CYLINDER SUPPORTING STRUCTURE OF RE-
CIPROCATING COMPRESSOR
Technical Field
[1] The present invention relates to a reciprocating compressor, and in particular to a
cylinder supporting stricture of a reciprocating compressor capable of facilating
assembly operation of a cylinder combined with a frame and preventing deformation
of the cylinder when the cylinder is fixed-combined with the frame and a discharge
cover covering thereon.
Background Art
[2] Generally, a compressor converts electrc energy into kinetic energy and
compresses refrigerant by the kinetic energy. The compressor is the core part, and the
compressor can be divided into a rotary compressor, a scroll compressor and a re-
ciprocating compressor, etc. according to fluid compression mechanisms.
[3] Figure 1 is a sectional view illustrating the reciprocating compressor. As depicted in
Figure 1, the reciprocating compressor includes a casing 100 having a gas siction pipe
110 and a discharge pipe 120; a frame unit 200 disposed in the casing 100; a driving
motor 300 installed to the frame unit 200 to generate a linear reciprocating driving
force; a compression unit 400 for compressing gas by receiving the driving force of the
driving motor 300; and a resonance spring unit 500 for resonating the driving force of
the driving motor 300.
[4] The frame unit 200 includes a front frame 210 for housing the compression unit
400; a middle frame 220 combined with the front frame 210; and a rear frame 230 for
fixing the driving motor 300 with the middle frame 220.
[5] The driving motor 300 includes an outer stator 310 fixed between the middle frame
220 and the rear frame 230; an inter stator 320 inserted into the outer stator 310 and
fixedly combined with the rear frame 230; a mover 330 movably inserted between the
outer stator 310 and the inner stator 320; and a wiring coil 340 combined with the
outer stator 310. The mover 330 consists of a magnet 331 and a magnetholder332 for
supporting the magnet 331.
[6] The compression unit 400 includes a cylinder 410 fixedly combined with the front
frame 210; a piston 420 in which one end is movably inserted into an inner spase (P)
of the cylinder 410 and the other end is fixedly combined with the mover 330; a
discharge cover 430 installed to a side of the front frame 210 to cover the inner space

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(P) of the cylinder; a discharge valve 440 disposed in the discharge cover 430 to open/
close the inner space (P) of the cylinder; a discharge spring 450 disposed in the
discharge cover 430 to support the discharge valve 440; and a suction valve 460
installed to the end of the piston 420 to control flow of refrigerant sicked into the inner
space (P) of the cylinder.
[7] Reference numeral 510 is a spring support, 520 is a front coil spring, and 530 is a
rear coil spring.
[8] Operation of the reciprocating compressor will be described as following.
[9] When power is supplied to the reciprocating compressor, a linear reciprocating
driving force is generated by electro-magnetic mutual operation of the driving motor
300, and the linear reciprocating driving force is transmitted to the piston 420 through
the mover 330.
[10] The piston 420 performs a linear reciprocating motion in the inner spare (P) of the
cylinder 410, by a pressure difference generated in the inner space (P) of the cylinder
420 according to the linear reciprocating motion, the siction valve 460 and the
discharge valve 440 are operated, and accordingly the refrigerant is sicked into the
inner space (P) of the cylinder 410, compressed and discharged. The discharged re-
frigerant is discharged to the outside through the discharge cover 430 and the
discharge pipe 120 combined with the discharge cover 430.
[11] By the resonance spring unit 500, the motion of the mover 330 and the piston 420 is
resonated.
[12] In the meantime, in order to minimize leakage of compression refrigerant between
the cylinder 410 and the piston 420 in the operation and improve a compression
performance, the cylinder 410 and the piston 420 have to be assembled precisely. In
addition, in order to make the piston 420 perform the linear reciprocating motion
smoothly in the inner space (P) of the cylinder 410, the cylinder 410 has to be
precisely combined to the front frame 210.
[13] Figure 2 is an exploded-sectional view illustrating the assembly of the cylinder.
[14] As depicted in Figure 2, in the front frame 210, a cylinder insertion hole 212 having
a certain inner diameter is pierced-formed at a certain-shaped body portion 211, a ring-
shaped oil pocket 213 having a certain width and depth is formed on the inner cir-
cumference of the cylinder insertion hole 212, and a mounting portion 214 having a
certain depth and outer diameter is formed at an inlet side of the cylinder insertion hole
212.
[15] The cylinder 410 is inserted into the cylinder insertion hole 412 of the front frame

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210. The cylinder 410 includes a cylinder portion 411 having a certain length; and a
ring-shaped bridging portion 412 extended-projected from the outer circumference of
the cylinder portion 411. In the cylinder 410, the cylinder portion 411 is inserted into
the cylinder insertion hole 212 of the body portion 211, and the bridging portion 412 is
inserted into the mounting portion 214.
[16] By the oil pccket 213 and the mounting portion 214 formed at the inner cir-
cumference of the cylinder insertion hole 212, relatively projected two portions are
formed, one is a front support portion 215, and the other is a rear support portion 216.
An inner diameter of the front support portion 215 and the rear support portion 216 is
corresponded to an outer diameter of the cylinder portion 411 of the cylinder 410, the
front support portion 215 and the rear support portion 216 are contacted to the outer
circumference of the cylinder portion 411 of the cylinder 410, and accordingly the
cylinder 410 is supported. In addition, an inner diameter of the mounting portion 214 is
corresponded to an outer diameter of the bridging portion 412 of the cylinder 410.
[17] The discharge cover 430 includes a cap portion 431 having a cap shape; and a
flange portion 432 curved-extended from the end of the cap portion 431.
[18] In the discharge cover 430, the flange portion 432 is contacted to the end surface
217 of the body portion 211 of the front frame and the side surface 413 of the bridging
portion 412 of the cylinder, and the flange portion 432 is combined with the end
surface 217 of the body portion 411 of the front frame by plural bolts 10 fastened at
the flange portion 432 of the discharge cover. Accordingly, the discharge cover 430 is
fixedly combined with the front frame 210.
[19] An oil passage 218 in which oil flow into/out of the oil pccket 213 is respectively
formed at the front frame 210.
[20] The piston 420 is movably inserted into the inner space (P) of the cylinder.
[21] Reference numeral 433 is a through hole, and 219 is a screw hole,
[22] However, in the above-mentioned stricture, when the plural bolts 10 are fastened in
order to combine the discharge cover 430, the front frame 210 and the cylinder 410, a
fastening force applied on the bolts 10 is transmitted to the front frame 210.
[23] The fastening force transmitted to the front frame 210 acts on the portion at which
bolt 10 is combined, due to that, repulsive power may act on the front support portion
215 which is the inner side of the portion at which the bolt 10 is fastened, and twisted
force generated in fastening of the bolts 10 may acton the front support portion 215.
[24] By the repulsive power and twisted force acting on the front support portion 215, as
depbted in Figure 3, deformation occurs at the front support portion 215 supporting

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the cylinder 410, and the deformation force is transmitted to the cylinder 410 contacted
with the front support portion 215. By the force transmitted to the cylinder 410, the
cylinder 410 may be deformed or error may cccur in assembly size of the cylinder, and
accordingly abrasion of the parts may oxur or operation may not be performed
smoothly.
Disclosure
[25] In order to solve the above-mentioned problems, it is an object of the present
invention to provide a cylinder supporting stricture of a reciprocating compressor
capable of facilitating assembly operation of a cylinder combined with a frame and
preventing deformation of the cylinder in combining of a discharge oover for covering
the cylinder with the frame.
[26] In order to achieve the above-mentioned object, in a reciprocating compressor
including a frame having a cylinder insertion hole therein, a cylinder inserted into the
cylinder insertion hole of the frame, a piston performing a linear reciprocating motion
in the cylinder by receiving a driving force of a driving motor, a discharge cover for
covering a side of the cylinder and a fastening means for combining the discharge
cover with the frame, a cylinder supporting stricture of a reciprocating compressor
includes a bridging portion formed in the cylinder; an axial support extended-projected
from the inner circumference of the cylinder insertion hole of the frame to support the
cylinder in the length direction by being supported by the bridging portion of the
cylinder, and a radial support extended-projected from the inner circumference of the
cylinder insertion hole of the frame to support the cylinder in the circumferentional
direction by being contacted-supported by the outer surface of the cylinder.
Description of Drawings
[27] Figure 1 is a sectional view illustrating a general reciprocating compressor;
[28] Figure 2 is an exploded-sectional view illustrating assembly of a cylinder of the
conventional reciprocating compressor;
[29] Figure 3 is an enlarged-sectional view illustrating a cylinder supporting stricture of
the reciprocating compressor;
[30] Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a
cylinder supporting stricture of a reciprocating compressor respectively;
[31] Figure 6 is a sectional view illustrating a modified example of an axial support of a
cylinder supporting structure of the reciprocating compressor in accordance with the
present invention; and
[32] Figure 7 is a partial-enlarged sectional view illustrating the cylinder supporting

WO 2004/081378 5 PCT/KR2004/000508
stricture of the reciprocating compressor in accordance with the present invention.
Mode for Invention
[33] Hereinafter, the preferred embodiments of the present invention will be described
with reference to acompanying drawings.
[34] Figures 4 and 5 are a front-sectional view and a side-sectional view illustrating a
cylinder supporting stricture of a reciprocating compressor respectively. The same
parts with the conventional art will have the same reference numerals.
[35] As depicted in Figures 4 and 5, a cylinder 410 is inserted into a front frame 240 of a
frame unit 200, and a piston 420 is movably inserted into an inner space (P) of the
cylinder. And, a discharge cover 430 covers a side of the cylinder 410 and is fixedly
combined with the front frame 240 by a fastening means. The fastening means is plural
bolts.
[36] In the front frame 240, a cylinder insertion hole 242 having a certain inner diameter
is formed at a certain-shaped body portion 241. And, a ring-shaped axial support 243
having a certain width and height is formed at the inner circumference of the cylinder
insertion hole 242, a ring-shaped radial support 244 having a certain width and height
is formed at the inner circuniference of the cylinder insertion hole 242 at a certain
internal from the axial support 243, herein the radial support 244 has an inner diameter
greater than that of the axial support 243.
[37] The axial support 243 is arranged so as to be nearer to the discharge cover 430 in
comparison with the radial support 244. The axial support 243 and the radial support
244 are extended-formed on the inner circumference of the cylinder insertion hole 242.
[38] The cylinder 410 includes a cylinder unit 411 having a certain length so as to
receive a piston 420 therein; and a bridging portion 412 projected from the outer cir-
cumference of the cylinder portion 411 so as to have a certain width and height. The
bridging portion 412 has a ring shape.
[39] An inner diameter of the cylinder insertion hole 242 of the front frame 240 is
greater than an outer diameter of the cylinder unit 411 of the cylinder 410, an inner
diameter of the radial support 244 of the front frame 240 is the same with an outer
diameter of the cylinder unit 411 of the cylinder 410, and an inner diameter of the axial
support 243 is smaller than an outer diameter of the cylinder unit 411.
[40] In the cylinder 410, the cylinder unit 411 is inserted into the cylinder insertion hole
242 of the front frame 240, a side surface of the bridging portion 412 is contacted to a
side surfxe of the axial support 243, and the inner ciraimfercnce of the radial support
244 is contacted to the outer circumference of the cylinder unit 411. By contacting the

WO 2004/081378 6 PCT/KR2004/000508
side of the axial support 243 of the front frame 240 to the side of the bridging portion
412, the cylinder 410 is supported in the axial direction, by contacting an inner surface
(A) of the radial support 244 of the front frame 240 to the outer circumference of the
cylinder unit 411, the cylinder 410 is supported in the radial direction.
[41] A width (a) of the radial support 244 is greater than a width (b) of the axial support
243.
[42] An oil pocket 245 in which oil circulates is formed in a space between the axial
support 243 and the radial support 244. A mounting portion 247 is formed between an
inlet of the cylinder insertion hole 242 and a side of the axial support 243. A width (c)
(in the length direction) of (he bridging portion 412 is the same with or greater than a
distance between the end of the inlet of the cylinder insertion hole 242 of the front
frame and a side surface of the axial support 243. An outer diameter of the bridging
portion 412 is smaller than an inner diameter of the cylinder insertion hole 242.
[43] The discharge cover 430 includes a cap portion 431 having a cap shape and a flange
portion 432 curved-extended from the cap portion 431.
[44] In the discharge cover 430, the flange portion 432 is contacted to an end surface
246 of the body portion of the front frame and a side of the bridging portion 412 of the
cylinder, and plural bolts 10 pierce through holes 433 formed at the flange portion 432
and are respectively fastened to screw holes 248 formed at the end surface 246 of the
body portion of the front frame. According lo that, the discharge cover 430 is fixedly
combined with the front frame 240, by fastening the plural bolts 10 to the discharge
cover 430 and the front frame 240, the cylinder 410 is pressurized-fixed to the
discharge cover 430.
[45] In the front frame 240, oil passages 249 in which oil flows into/out of the oil pocket
245 are formed.
[46] In the discharge cover 430, a discharge valve 440 for opening/closing an inner
space (P) of the cylinder and a discharge spring 450 for elastcally supporting the
discharge valve 440 are arranged.
[47] As depicted in Figure 6, as a modified form of the axial support 243, the axial
support 243 consists of plural protrusions (B) extended-formed at the inner wall of the
cylinder insertion hole 242 so as to have a certain width, height and length in the cir-
cumferential direction. A diameter of a circle formed by the inner surface of the plural
protrusions (B) is greater than an outer diameter of the cylinder 410.
[48] Hereinafter, advantages of the cylinder supporting stricture of the reciprocating
compressor in accordance with the present invention will be described.

WO 2004/081378 7 PCT/KR2004/000508
[49] In the present invention, the cylinder 410 combined with the front frame 240 is
supported in the axial and radial direction by pressurization of the discharge cover 430,
and accordingly a combination state is firm. In more detail, the bridging portion 412 of
the cylinder contacts-supports the axial support 243 in the axial direction, the
discharge cover 430 pressurizes the cylinder 410 in the axial direction, the radial
support 244 of the front frame supports the outer ciraimference of the cylinder portion
411 of the cylinder in the radial direction, and accordingly the combination state of the
cylinder 410 is firm.
[501 And, when the plural bolts 10 are fastened to combine the discharge cover 430, the
front frame 240 and the cylinder 410, the fastening force by the bolts 10 acts on the
front frame 240. The fastening force acting on the front frame 240 acts on a portion at
which the bolt 10 is combined, axording to that, repulsive power xts on the axial
support 243 formed at the inner side of the portion (at which the bolt 10 is combined),
and twisted force occurred in fastening of the bolts 10 acts on the axial support 2-6.
Hbwever, because the axial support 243 is not contacted to the cylinder portion 411 of
the cylinder but maintains a certain interval, the repulsive power and the twisted force
act only on the axial support 243 without being transmitted to the cylinder 410. Ac-
cordingly, by the fastening of the plural bolts 10, deformation of the cylinder is
prevented, by making the fastening force of the bolts 10 acting only in the axial
direction of the cylinder 410 through the discharge cover 430, the bridging portion 412
of the cylinder is supported by the axial support 243 in the axial direction, and ac-
cordingly the cylinder 410 is fixed.
[51] In addition, in the present invention, an inner diameter of the axial support 243 of
the front frame is greater than an outer diameter of the cylinder portion 411, when the
cylinder 410 is combined with the front frame 240, assembly operation can be
simplified.
Industrial Applicability
[52] As described-above, in the cylinder supporting stricture of the reciprocating
compressor in axordance with the present invention, when the cylinder for
compressing gas is fixedly combined with the frame, by preventing deformation of the
cylinder, the cylinder can maintain a set assembly size, and accordingly it is possible to
prevent contact and abrasion between parts in operation and perform the operation
smoothly. Therefore, life span of the parts can be extended, and reliability can be
improved.
[53] In addition, by facilitating assembly operation of the cylinder, assembly pro-

WO 2004/081378 8 PCT/KR2004/000508
dictivity can be improved, by maintaining a firm assembly state, collision and noise
among the parts can be prevented.

WO 2004/081378 9 PCT/KR2004/000508
Claims
[1] In a reciprocating compressor including a frame having a cylinder insertion hole
therein, a cylinder inserted into the cylinder insertion hole of the frame, a piston
performing a linear reciprocating motion in the cylinder by receiving a driving
force of a driving motor, a discharge cover for covering a side of the cylinder
and a fastening means for combining the discharge cover with the frame, a
cylinder supporting stricture of a reciprocating compressor, comprising:
a bridging portion formed in the cylinder;
an axial support extended-projected from the inner circumference of the cylinder
insertion hole of the frame to support the cylinder in the length direction by
being supported by the bridging portion of the cylinder; and
a radial support extended-projected from the inner circumference of the cylinder
insertion hole of the frame to support the cylinder in the circumferentional
direction by being contasted-supported by the outer surface of the cylinder.
[2] The stricture of claim 1, wherein the axial support is formed as a ring shape
having a certain width and height, and an inner diameter of the axial support is
greater than an outer diameter of the cylinder.
[3] The structure of claim 1, wherein the radial support is formed as a ring shape
having a certain width and height, and an inner diameter of the radial support is
the same with an outer diameter of the cylinder.
[4] The stricture of claim 1, wherein a length directional width of the radial support
is greater than a length directional width of the axial support.
[5] The stricture of claim 1, wherein the bridging portion of the cylinder on the
outer circumference of the cylinder is formed as a ring shape having a certain
width and height
[6] The stricture of claim 5, wherein an outer diameter of the bridging portion is
smaller than an inner diameter of the cylinder insertion hole of the frame.
[7] The stricture of claim 1, wherein the axial support and the radial support are
formed so as to have a certain interval therebetween, and an oil pocket in which
oil flows is formed between the axial support and the radial support.
[8] The stricture of claim 1, wherein a distance between the inlet end of the cylinder
insertion hole of the cylinder and a side of the axial support is less than or the
same with a length directional width of the bridging portion of the cylinder.
[9] The stricture of claim 1, wherein the cylinder is pressurized-combined with the

WO 2004/081378 10 PCT/KR2004/000508
discharge cover by combining the discharge cover and the frame by using the
fastening means.
[10] The stricture of claim 1, wherein the axial support consists of plural protrusions
extended-formed at the inner wall of the cylinder insertion hole of the frame so
as to have a certain width, height and circumferential length, and a diameter of a
circle formed by the inner surface of the protrusions is greater than an outer
diameter of the cylinder.

In a cylinder supporting structure of a reciprocating compressor for combining a cylinder compressing gas with a
franse with a fastening means, by including a bridging portion formed in the cylinder, an axial support extended-projected from the
inner circumference of the cylinder, and a radial support extended-projected from the inner circumference of the cylinder insertion
hole of the frame to support the cylinder in the circumferential direction by being contacted-supported by the outer surface of the
cylinder, it is possible to prevent deformation of the cylinder and facilitate assembly operation.

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Patent Number

219508

Indian Patent Application Number

01775/KOLNP/2005

PG Journal Number

19/2008

Publication Date

09-May-2008

Grant Date

07-May-2008

Date of Filing

06-Sep-2005

Name of Patentee

LG ELECTRONICS INC.

Applicant Address

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

Inventors:

#	Inventor's Name	Inventor's Address
1	AHN, SANG-WOOK	30-18, NAMYANG-DONG, 641-803, CHANGWON GYEONGSANGNAM-DO, REPUBLIC OF KOREA.

PCT International Classification Number

F04B 39/00

PCT International Application Number

PCT/KR2004/000508

PCT International Filing date

2004-03-11

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10-2003-0015222	2003-03-11	Republic of Korea