Title of Invention

AN OIL SUCTION PROPELLER STRUCTURE FOR A HERMETICALLY SEALED COMPRESSOR

Abstract

According to the present invention there is disclosed an oil suction propeller structure which is used in the field of hermetically sealed compressor, and is capable of enhancing an oil supply capacity and minimizing a whirling sound and dropping noise which may occur during rotation of a piece and a propeller thereof, by gradually broadening a portion of the propeller in width from bottom to top, said compressor comprising a rotor, a crank shaft (10) pressure fitted in the rotor; an oil guide piece (20) formed in a three tiered conical shape and pressure fitted in a lower portion of the crank shaft (10); an oil suction propeller (30) fixedly inserted in the oil guide piece (20); characterized in that, the oil suction propeller (30) is formed in a three tiered conical shape containing: a lower portion (30b) soaked in the oil in said compressor, an upper portion (3 0a) having a width wider than that of the lower portion (30b); and the intermediate portion (30c) gradually broadening in width towards the upper portion (30a).

Full Text

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil suction propeller structure for a hermetically sealed compressor, and more particularly to an improved propeller structure for a hermetically sealed compressor capable of enhancing an oil supply capacity and minimizing a whirling sound and a dropping noise which may occur during rotation of a piece and a propeller thereof, by gradually broadening a wing of the propeller in width from bottom to top. 2, Description of the Prior Art As shown in Figure 1, a conventional hermetically sealed compressor includes a hermetic container 1 having an upper and a lower cells 1a, 1b, and a motor unit 3 provided in the hermetic container 1 and having a rotor 3a and a stator 3b. An end of each of a plurality of support springs 4 is connected to a side portion along the inner periphery of the lower cell 1 b, and another end of each of the support springs 4 supports a frame 2. A crank shaft 5 having an eccentric portion 6 at an upper portion thereof is heat-inserted into the hole in the rotor 3a. A cylinder 7 is connected to an upper portion of the frame 2. A piston 8 that horizontally shuttles in the cylinder 7 is engaged to the eccentric portion 6 of the crank shaft 5. 1A A valve plate 9 is attached onto an end portion of the cylinder 7, and a head cover 10 is attached onto the valve plate 9. A suction muffler (not shown) is mounted on a portion of the head cover 10. With reference to Figure 2, in order to suck a oil "O" in through the crank shaft 5, a cylinder type oil guide piece 11 is pressure-inserted into the crank shaft 5 which becomes rotated in accordance with the rotor 3a. An oil suction propeller 12 is fixedly inserted into the oil guide piece 11. At this time, respective widths of an upper and lower wings 12a, 12b comprising the suction propeller 12 are identical to each other, and the lower wing 12b of the oil suction propeller 12 is dipped in the oil "O". The oil "O" kept in a lower portion of the hermetic container 1 is upwardly sucked by the rotation of the crank shaft 5 and scattered over the crank shaft 5, The scattered oil "O" is soaked through respective friction portions in the compressor for thereby preventing overheating and abrasion. The oil sucking steps of the thusly constituted hermetically sealed compressor will now be described with reference to Figure 2, First, when an electrical power is supplied to the hermetically sealed compressor, the rotor 3a starts its rotation, Accordingly, as the crank shaft 5 heat-inserted into the rotor 3a becomes rotated, the oil guide piece 11 and the oil suction propeller 12 become rotated. The thusly generated centrifugal force and an thrust force serve to upwardly suck the oil "0". At this time, the centrifugal force and the thrust force are variable depending on respective diameters of the oil guide piece 11 and the oil suction propeller 12, That is, the more increased become the respective diameters of the upper and tower oil suction propeller wings 12a, 12b, the stronger the centrifugal force 2 and the thrust force, and the more oil "O" is upwardly sucked. To the contrary, as the respective diameters of the upper and lower oil suction propeller wings 12a, 12b become smaller, so does the amount of the oil "O" being upwardly sucked resulting from the decreased centrifugal force and the thrust force. However, in the oil suction propeller structure of the conventional hermetically-sealed compressor, as shown in Figure 3, although the sucked-up amount of the oil becomes increased when the respective diameters of the oil guide piece and the oil suction propeller are increased, the oil portion that is in contact with the outer periphery of the oil guide piece may be whirled during the oil suction propeller rotation for thereby generating noise caused by a whirling and a dropping of the oil "O". Further, when the respective diameters of the oil guide piece and the oil suction propeller are decreased for preventing the whiling and dropping noise, the centrifugal force and the thrust force are also decreased, for thereby deteriorating an oil supplying capacity. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an oil suction propeller structure for a hermetically sealed compressor for minimizing a whirling and dropping noise that may occur due to a whirl current of an oil during a rotation of an oil guide piece and an oil suction propeller as well as preventing the oil supply capacity from being deteriorated. -3- Accordingly, the present invention provides an oil suction propeller structure for a hermetically sealed compressor, said compressor comprising : a rotor, a crank shaft pressure fitted in the rotor; an oil guide piece formed in a three tiered conical shape and pressure fitted in a lower portion of the crank shaft; an oil suction propeller fixedly inserted in the oil guide piece; characterized in that, the oil suction propeller is formed in a three tiered conical shape containing: a lower portion soaked in the oil in said compressor, an upper portion having a width wider than that of the lower portion; and the intermediate portion gradually broadening in width towards the upper portion. -3A- ACCOMPANYING BRIEF DESCRIPTION OF THE/DRAWINGS The present invention will become better understood, with reference to the accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein: Figure 1 is a cross-sectional view illustrating a conventional hermetically sealed compressor; Figure 2 is a cross-sectional partial view detailing an oil suction propeller structure of the conventional hermetically sealed compressor: Figure 3 is a cross-sectional view of the oil suction propeller structure illustrating an oil flow in the conventional hermetically sealed compressor; Figure 4 is a cross-sectional partial view detailing an oil suction propeller structure of a hermetically sealed compressor according to the present invention; Figure 5 is a cross-sectional partial view illustrating the flow of oil in the oil suction propeller structure of a hermetically sealed compressor according to the present invention; Figure 6A is a graph for comparing the conventional oil guide piece to the oil guide piece according to the present invention; 4 Figure 6B is a graph for illustrating an oil supply to oil guide pieces having different widths; and Figure 6C is a graph for illustrating noise amounts with regard to oil guide pieced having different widths. DETAILED DESCRIPTION OF THE INVENTION With reference to the accompanying drawings, the oil suction propeller structure of an hermetically sealed compressor according to the present invention will be described. As shown in Fig. 4, the oil suction propeller structure of the present invention becomes vertically narrowed from top to bottom in respective diameters of a crank shaft 10, which is pressure-inserted in a rotor (not shown) and having an oil path 40 along the axis therethrough, and of an oil guide piece 20 which is pressure-inserted in a lower portion of the crank shaft 10. That is, the crank shaft 10 and the oil guide piece 20 are narrower in their lower portions than in their upper portions. Specifically, as shown in Fig. 5, an oil suction propeller 30 fixedly inserted in the oil guide piece 20 has an upper wing 30a and a lower wing 30b, wherein the lower wing 30b portion which is in contact with the oil "O" is narrow compared to the upper wing 30a portion. An intermediate portion 30c extending from the upper wing 30a to the lower wing 30b becomes gradually wider from low to high until it reaches up to the upper wing 30a. The operation of the thusly constituted oil suction propeller structure will now be described. 5 When the crank shaft 10 starts rotation, the oil guide piece 20 and the oil suction propeller 30 respectively engaged to the crank shaft 10 rotate on the common axis thereof. At this time, a central portion of the oil guide piece 20 becomes a rotational center for thereby generating a centrifugal force. Accordingly, the oil suction propeller structure decreases a whirling sound and a dropping noise by narrowing the lower width of the oil guide piece 20 and the oil suction propeller 30, while improving a suction capability of the oil "O" by widening an upper portion of the oi! suction propeller 30. With reference to Figures 6A through 6C, the effects with regard to the oil guide piece employed in the oil suction propeller structure of the hermetically sealed compressor according to the present invention will now be explained in comparison to the conventional oil guide piece. In Figure 6A, there are provided three oi! guide pieces having different widths respectively, and the respective oil suction propellers inserted in the respective oil guide pieces also differ from one another in width. The measurement is carried out under an identical condition. Here, in each of Figures 6A-6C, "a" denotes a conventional oil guide piece having a width of 010, "b" indicates another conventional oil guide piece having a width of 013.8. An oil guide piece "c" according to the present invention is provided with its upper width of 013,8 and its lower width of 010, wherein the lower portion of the oil guide piece-with the lower width of 010 remains soaked in the oil "O", A vertical axis of the graph in Figure 6B indicates an oil supply per minute (cc/min), and a horizontal axis of the graph in Figure 6C denotes noise (dBA). The conventional oil guide piece "a" having its width of 010 in Fig. 6A is 6 small as disclosed in the oil guide piece "a" in Fig. 6C, and the thusly generated noise becomes 40 dBA. However, in accordance with the decreased centrifugal force and thrust force, the oil supply capacity becomes 210cc/min as shown in Fig. 6B, for thereby deteriorating the oil supply capacity by 120cc/min, compared to "c" in Fig. 6B. Also, the oil guide piece "b" in Fig. 6A has its width of 013.8, and the width of the conventional oil guide piece "b" in Fig. 6B is large, and accordingly its centrifugal force and the thrust force become large, for thereby enabling the oil supply to reach its target amount. However, as shown in "c" of Fig. 6C, the noise level remains higher than 40dBA. In order to overcome such disadvantages of the conventional oil guide pieces, the present invention provides the oil guide piece having a width of 013.8 in its upper portion and a width of 010 in its lower portion, so that the oil supply may be at a rate of 330 cc/min as shown in "c" of Fig. 6B, whereby the oil supply amount becomes equivalent to that of the conventional oil guide piece "b" with its width of 013:8. Also, as shown in "c" of Fig. 6C, the oil guide piece noise according to the present invention becomes equivalent to that of the conventional oil guide piece having its width of 010. That is, the present invention improves an oil supply capability and significantly decreases noise. As described above, the oil suction propeller structure of an hermetically sealed compressor allows the improved oil supply capacity to enhance reliability of the hermetically sealed compressor. Further, the present invention minimizes a whirling sound and a dropping noise which may occur during the rotation of the oil guide piece and the oil suction propeller thereof. 7 WE CLAIM: 1. An oil suction propeller structure for a hermetically- sealed compressor, said compressor comprising : a rotor, a crank shaft pressure fitted in the rotor; an oil guide piece formed in a three tiered conical shape and pressure fitted in a lower portion of the crank shaft; an oil suction propeller fixedly inserted in the oil guide piece; characterized in that, the oil suction propeller is formed in a three tiered conical shape containing: a lower portion soaked in the oil in said compressor, an upper portion having a width wider than that of the lower portion; and the intermediate portion gradually broadening in width towards the upper portion. 2. The structure as claimed in claim 1, wherein the oil guide piece structurally matches the given structural shape of the oil suction propeller. 3. The structure as claimed in claim 1, wherein a width of an upper portion of the oil guide piece and a width of a lower portion thereof are in a ratio of 13.8 to 10 relative to one another. 4. An oil suction propeller for a hermetically sealed compressor, substantially as herein described, particularly with reference to and as illustrated in figures 4, 5, 6A, 6B and 6C of the accompanying drawings. -8- 5. A hermetically sealed compressor, incorporating an oil suction propeller structure as claimed in any of claims 1 to 3. Dated this 21st day of October 1997. -9- According to the present invention there is disclosed an oil suction propeller structure which is used in the field of hermetically sealed compressor, and is capable of enhancing an oil supply capacity and minimizing a whirling sound and dropping noise which may occur during rotation of a piece and a propeller thereof, by gradually broadening a portion of the propeller in width from bottom to top, said compressor comprising a rotor, a crank shaft (10) pressure fitted in the rotor; an oil guide piece (20) formed in a three tiered conical shape and pressure fitted in a lower portion of the crank shaft (10); an oil suction propeller (30) fixedly inserted in the oil guide piece (20); characterized in that, the oil suction propeller (30) is formed in a three tiered conical shape containing: a lower portion (30b) soaked in the oil in said compressor, an upper portion (3 0a) having a width wider than that of the lower portion (30b); and the intermediate portion (30c) gradually broadening in width towards the upper portion (30a).

Documents:

01973-cal-1997-abstract.pdf

01973-cal-1997-assignment.pdf

01973-cal-1997-claims.pdf

01973-cal-1997-correspondence.pdf

01973-cal-1997-description(complete).pdf

01973-cal-1997-drawings.pdf

01973-cal-1997-form-1.pdf

01973-cal-1997-form-13.pdf

01973-cal-1997-form-2.pdf

01973-cal-1997-form-3.pdf

01973-cal-1997-p.a.pdf

1973-CAL-1997-CORRESPONDENCE 1.1.pdf

1973-CAL-1997-FORM-27.pdf

1973-CAL-1997-PA.pdf