KR100332788B1 - Structure for lubrication of compressor - Google Patents

Abstract

The present invention relates to a lubrication oil supply structure of the compressor, the present invention is an oil flow path for supplying oil to each mechanism portion for performing the lubrication of the compressor is formed inside the rotating shaft, the lower end of the oil flow path in the case A cylindrical oil pick-up for supplying oil to the oil passage is press-installed, and a protrusion for supporting the press-in of the oil pick-up with respect to the rotary shaft is minimized on the circumferential surface of the oil pick-up to minimize the deformation of the rotary shaft due to the oil pick-up. The oil pick-up is formed by the protrusion to be press-fitted to the lower end of the rotary shaft to prevent the change of the outer diameter of the lower end of the rotary shaft, thereby minimizing the wear of the outer diameter of the lower end of the rotary shaft and the inner diameter of the sub-bearings contacting the lower end of the rotary shaft. Ultimately, the compressor's performance is improved and its life is extended. It is a lock.

Description

Lubrication Lubrication Structure of Compressor {STRUCTURE FOR LUBRICATION OF COMPRESSOR}

The present invention relates to a lubricating oil supply structure of a compressor, and more particularly, to a lubrication oil supply structure of a compressor in which an oil pick-up is press-fitted at a lower end of the rotating shaft to supply oil stored in a lower portion of a case to an oil passage of a rotating shaft.

1 is a longitudinal cross-sectional view illustrating a structure of a general rotary compressor, in which the rotary compressor includes a case 1 having a predetermined internal volume and an electric mechanism unit installed inside the case 1 to generate a driving force. And a compressor mechanism for compressing the refrigerant gas by receiving the driving force of the power mechanism, wherein the power mechanism is inserted into the stator 2 and the stator 2 fixedly coupled to the case 1. It consists of a rotating rotor (3), the compression mechanism is composed of a rotating shaft (4), cylinder (5), main bearing (7) and sub-bearing (8), rolling piston (9) and vanes (not shown) have.

Here, the rotating shaft (4) is formed at the lower portion of the eccentric (4a) is pressed into the inner diameter of the rotor (3), the cylinder (5) has a compression chamber (P) in which gas is sucked and compressed therein It is provided in the case 1 so that the eccentric part 4a of the said rotating shaft 4 is inserted in the said compression chamber P. As shown in FIG.

In addition, the main bearing 7 and the sub-bearing 8 are inserted into the rotary shaft 4 and coupled to the upper and lower portions of the cylinder 5 so as to support the rotary shaft 4 by the fastening of bolts, respectively, the rolling The piston 9 is in linear contact with the inner peripheral surface of the compression chamber P of the cylinder 5 and is inserted into the eccentric portion 4a of the rotary shaft so as to rotate and revolve as the rotary shaft 4 rotates.

Finally, the vane is inserted in a linear motion on one side of the cylinder 5 so as to partition the compression chamber P into the suction part and the compression part while the end thereof is in sliding contact with the outer circumferential surface of the rolling piston 9. .

In addition, a discharge port 5a for discharging the compressed refrigerant gas is formed at one side of the cylinder 5, and a discharge hole 7a is formed at one side of the main bearing 7 so as to communicate with the discharge port 5a. Is formed, the upper side of the case 1 is coupled to the discharge tube 10 for discharging the compressed gas to the outside.

In addition, an upper surface of the main bearing 7 has a discharge valve 13 for opening the discharge hole 7a when the refrigerant gas is above a predetermined pressure, and a retainer for limiting and supporting an open state of the discharge valve 13. 14 are coupled together, and a muffler 16 for reducing the discharge noise of the refrigerant gas is opened and coupled to the upper portion of the main bearing 7.

In addition, an inlet 5b is formed at one side of the cylinder 5 to introduce refrigerant gas into the compression space P, and the inlet 5b is connected to an accumulator 20 installed at the side of the case 1. The suction pipe 12 is coupled, and the lower portion of the case 1 is filled with oil supplied to the sliding element.

In addition, an appropriate oil film is formed between the main bearing 7 and the sub-bearing 8 and the rotating shaft 4 on the rotating shaft 4 so that the rotation of the rotating shaft 4 is naturally performed. A lubrication oil supply structure is provided for lubricating by supplying oil between the sub-bearing 8 and the rotating shaft 4.

2 is a cross-sectional view showing a lubrication oil supply structure of the compressor according to the prior art, Figure 3 is a plan view (a) and a front sectional view (b) showing the oil pickup according to the prior art.

Referring to FIG. 2, the lubricating oil supply structure of the compressor according to the related art is an oil formed inside the rotating shaft 4 to supply oil between the main bearing 7 and the sub bearing 8 and the rotating shaft 4. The oil pick-up 18 made of steel, which is press-fitted to the lower end of the oil channel 4b to supply the oil path 4b, the oil in the case 1 lower portion to the oil channel 4b, and the oil pick-up 18 It is composed of a propeller 19 is installed on the upper side of the oil pickup 18 to provide a suction force so that the inflow of the oil through smoothly.

Here, as shown in FIG. 3, the oil pick up 18 is formed in a cylindrical shape with one side opened, and an oil supply hole 18a is formed at the other side thereof so that the opened face faces upward. It is provided in the oil flow path 4b of 4).

That is, the oil pickup 18 is press-fitted to protrude downward from the lower end of the rotation shaft 4 so that the oil stored in the lower part of the case 1 is smoothly supplied to the oil channel 4b of the rotation shaft 4. Perform the function.

At this time, the reference dimension of the inner diameter of the rotary shaft 4 is 0 to +0.03, the reference dimension of the outer diameter of the oil pick-up 18 is 0 to -0.05, the press-fitting zone of the rotary shaft 4 and the oil pick-up 18 is 0.02 It is set to -0.1 mm.

However, in the lubricating oil supply structure as described above, since the circumferential surface of the oil pick-up 18 is press-fitted into the oil passage 4b of the rotation shaft 4 as a whole, the elastic force of the oil pick-up 18 itself or the oil pick-up 18 Due to the repulsive force of the rotary shaft 4, the outer diameter of the lower end of the rotary shaft 4 is changed.

Therefore, the lubrication oil supply structure of the compressor according to the prior art is the wear of the outer diameter of the lower end of the rotary shaft 4 and the inner diameter of the sub-bearing 8 in contact therewith due to the change in the outer diameter of the lower end of the rotary shaft 4 due to the oil pickup 18. When the phenomenon is severe, the phenomenon occurs that the operation of the compressor itself is not possible even occurs a lock (Lock) phenomenon.

The object of the present invention devised in view of the above problems is to provide a lubricating oil supply structure of the compressor to prevent deformation of the rotating shaft due to oil pick-up, thereby minimizing wear of the rotating shaft and the sub-bearing and preventing lock failure of the compressor. In providing.

1 is a longitudinal sectional view showing a structure of a general rotary compressor;

2 is a cross-sectional view showing a lubrication oil supply structure of the compressor according to the prior art,

3 is a plan view (a) and a front cross-sectional view (b) showing an oil pick-up according to the prior art,

4 is a sectional view showing a lubrication oil supply structure of the compressor according to the present invention;

5 is a plan view (a) and a front cross-sectional view (b) of the oil pickup according to the present invention,

6 is an enlarged cross-sectional view of part A of FIG. 5;

7 is a plan view (a) and a front view (b) showing the oil pickup according to another embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

50: case 51: rotation axis

51a: oil euro 53: sub-bearing

55: oil pickup 57: embossing

57 ': strip-shaped projection

In order to achieve the object of the present invention as described above, an oil flow path for supplying oil to each of the mechanism parts to perform the lubrication action of the compressor is formed inside the rotating shaft, the lower end of the oil flow path oil in the case In the press-installed cylindrical oil pick-up for supplying the oil to the oil passage, the oil pick-up to the rotary shaft is minimized on the circumferential surface of the oil pick-up to minimize the deformation of the rotary shaft due to the press-in of the oil pick-up to the oil passage A lubricating oil supply structure of a compressor is provided, characterized in that a supporting protrusion is formed.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 4 is a cross-sectional view showing a lubrication oil supply structure of the compressor according to the present invention, Figure 5 is a plan view (a) and a front sectional view (b) showing the oil pick-up according to the present invention, Figure 6 is part A of Figure 5 7 is an enlarged cross-sectional view, and FIG. 7 is a plan view (a) and a front view (b) showing an oil pickup according to another embodiment of the present invention.

4 to 6, the lubrication oil supply structure of the compressor according to the present invention, the deformation of the rotary shaft 51 due to the oil pick-up 55 is pressed into the lower end of the rotary shaft 51 of the compressor to minimize the The oil pickup 55 is press-fitted to the rotation shaft 51 by the protrusion 57 formed on the circumferential surface of the oil pick-up 55 instead of the entire circumferential surface thereof.

In other words, an oil flow path 51a is provided inside the rotary shaft 51 to supply oil between the respective mechanical parts, that is, the main bearing and the sub bearing 53 and the rotary shaft 51 to perform a lubricating action. At the lower end of the oil passage 51a, a cylindrical oil pickup 55 for supplying the oil stored in the lower portion of the case 50 to the oil passage 51a is protruded and installed to protrude to the lower side of the rotary shaft 51. A circumferential surface of the oil pick-up 55 is provided with a protrusion supporting the press-in of the oil pick-up with respect to the rotation shaft 51 so that deformation of the rotation shaft 51 due to the press-in of the oil pick-up 55 is minimized.

Here, as shown in FIG. 5, the oil pick-up 55 is formed in a cylindrical shape with one side opened and an oil supply hole 55a formed at the other side thereof so that the opened surface faces upward. 51 is provided in the oil flow path 51a.

In addition, as shown in FIGS. 5 and 6, at least one hemispherical embossing 57 formed on the circumferential surface of the oil pick-up 55 is protruded to have a height of 0.1 mm or less.

In addition, the embossing 57 is most preferably formed about four at intervals of 90 degrees along the circumferential surface of the oil pickup (55).

At this time, the reference dimension of the inner diameter of the rotary shaft 51 is 0 to +0.03, the reference dimension of the embossing 57 of the oil pick-up 55 is 0 to -0.03, of the rotary shaft 51 and the embossing 57 The press-fitting table is set to 0.02 to 0.1 mm.

In addition, according to another embodiment of the present invention, the protrusion is a strip-shaped protrusion 57 'continuously formed along the circumferential surface of the oil pickup 55', and the cross-sectional shape of the protrusion 57 'is embossed. It is made to be the same as the cross-sectional shape of 57.

Finally, the propeller 59 is provided on the upper side of the oil pick-up 55 to provide a suction force so that the inflow of oil through the oil pick-up 55 is made smoothly.

As described above, in the lubrication oil supply structure of the compressor according to the present invention, since the oil pick-up 55 is press-fitted to the lower end of the rotation shaft 51 by a protrusion formed on the circumferential surface of the oil pick-up 55, the rotation shaft is formed by the protrusion. The press-fit of the oil pick-up 55 to the 51 is supported to prevent the change in the outer diameter of the lower end of the rotary shaft 51, and thus the outer diameter of the lower end of the rotary shaft 51 and the wear of the inner diameter of the sub-bearing 53 in contact with the lower end of the rotary shaft 51. Is minimized and compressor lock failure is prevented, thereby improving the performance of the compressor and extending its life.

Claims (3)

An oil flow path for supplying oil to each of the mechanism parts is formed inside the rotating shaft to perform lubrication of the compressor, and a cylindrical oil pick-up for supplying oil in the lower part of the case into the oil flow path is press-fitted at the lower end of the oil flow path. In being installed, The lubrication oil supply structure of the compressor, characterized in that the circumferential surface of the oil pick-up is provided with a protrusion for supporting the press-in of the oil pick-up to the rotary shaft to minimize the deformation of the rotary shaft due to the press-in of the oil pick-up to the oil passage. The method of claim 1, Lubricating oil supply structure of the compressor, characterized in that the projection is at least one formed hemispherical embossing. The method of claim 1, The protrusion is a lubrication oil supply structure of the compressor, characterized in that the strip-shaped projection continuously formed along the circumferential surface of the oil pickup.