KR100422365B1 - Lubricating system for hermetic reciprocating compressor - Google Patents

Abstract

The lubrication structure of the hermetic reciprocating compressor according to the present invention includes a main oil flow passage axially penetrated to an eccentric portion of the crankshaft to communicate with an oil pick-up tube; A first oil flow path formed on an outer circumferential surface of the crankshaft eccentric to supply lubricating oil of the main oil flow path to the friction sliding portion between the eccentric portion of the crankshaft and the large diameter portion of the connecting rod; A second oil flow path formed on the crank shaft to supply lubricating oil of the main oil flow path to the friction sliding portion between the crank shaft and the bearing; A third oil passage formed inside the connecting rod to supply lubricating oil of the first oil passage to the friction sliding portion between the small diameter portion of the connecting rod and the piston pin and the bore surface of the cylinder block and the piston; A fourth oil flow passage formed on one side of the cylinder block so that lubricating oil lubricating and scattering and falling by the friction sliding portion between the crankshaft and the bearing are supplied to the friction sliding portion between the inner surface of the cylinder block and the piston; And a fifth oil passage formed in the piston pin such that a part of the oil supplied through the fourth oil passage is supplied to the friction sliding portion between the small diameter portion of the connecting rod and the piston pin. According to this, the amount of lubricating oil supplied to the friction sliding portion between the small diameter portion of the connecting rod and the piston pin and the bore inner surface of the cylinder block and the piston is increased, so that lubrication can be smoothly performed on this portion.

Description

Lubrication system of hermetic reciprocating compressor {Lubricating system for hermetic reciprocating compressor}

The present invention relates to a hermetic reciprocating compressor, and more particularly to a lubrication structure of a hermetic reciprocating compressor for supplying lubricating oil to each friction sliding part of the compressor.

The hermetic king rod type compressor is configured to compress the refrigerant by converting the rotational motion of the electric mechanism into a reciprocating linear motion of the compression mechanism by using a crank mechanism. Thus, friction sliding portions between the components exist. As shown in FIG. 1, the friction sliding part of the compressor includes the crank shaft 1 between the eccentric portion 2 of the crank shaft 1 constituting the crank mechanism and the large diameter portion 4 of the connecting rod 3. And between the bearing 5, between the small diameter portion 6 of the connecting rod 3 and the piston pin 7, and between the bore inner surface of the cylinder block 8 and the piston 9. In the friction sliding part described above, when the compressor is driven, high heat is generated due to friction between the members, and severe wear occurs. Therefore, lubrication is required for this part. Therefore, the hermetic reciprocating compressor employs a lubrication structure for supplying lubricating oil to the respective friction sliding parts as described above. In FIG. 1, reference numeral 10 denotes a hermetically sealed container, and 11 and 12 denote rotors and stators constituting the electric mechanism part.

As shown in FIG. 2, the lubrication structure of the conventional hermetic reciprocating compressor sucks the lubricating oil stored at the bottom of the hermetic container 10 (see FIG. 1) into the oil pickup tube 20 and supplies the lubricating oil to each friction sliding part. First to third oil passages 22, 23 and 24 are provided.

The oil pick-up tube 20 is connected to the eccentric portion 2 of the crankshaft 1, the lubricant stored in the bottom of the sealed container 10 by the centrifugal force by the rotation of the oil pick-up tube 20 is sucked in The first to third oil passages 22, 23 and 24 are supplied to each friction sliding part. The eccentric portion 2 is formed with a main oil passage 21 communicating with the oil pick-up tube 10 in the axial direction of the eccentric portion.

The first oil passage 22 is formed to communicate with the main oil passage 21 at an approximately central portion of the outer circumferential surface of the eccentric portion 2, and is deflected by the lubricating oil supplied through the first oil passage 22. The friction sliding portion between the core portion 2 and the large diameter portion 4 of the connecting rod 3 is lubricated.

The second oil passage 23 is formed in the crankshaft 1 so as to communicate with the main oil passage 21 of the eccentric portion 2, and to the lubricating oil supplied through the second oil passage 23. As a result, the friction sliding portion between the crankshaft 1 and the bearing 5 is lubricated.

The third oil channel 24 is formed to communicate with the first oil channel 22 of the eccentric portion 2 in the connecting rod 3, and is supplied through the third oil channel 24. The friction sliding portion between the small diameter portion 6 of the connecting rod 3 and the piston pin 7 is lubricated by the lubricating oil.

On the other hand, the piston pin (7) is formed in a hollow, the lubricating oil flowing through the third oil passage 24 is filled in the hollow friction between the bore inner surface of the cylinder block (8) and the piston (9). The sliding part is lubricated.

However, in the lubrication structure of the conventional hermetic reciprocating compressor as described above, the small diameter portion 6 of the connecting rod 3 is provided by the lubricating oil supplied through the third oil passage 24 formed inside the connecting rod 3. ), The friction sliding portion between the piston pin (7) and the bore inner surface of the cylinder block (8) and the piston (9) is not enough, so the amount of lubricant supplied is not sufficient. There is a problem that the life of the neck, the bore inner surface of the cylinder block and the piston, etc. are shortened, and the noise is caused by the wear of such a member.

The present invention has been made in view of the above problems, and the wear of these members is ensured by supplying a sufficient amount of lubricant oil between the small diameter portion of the connecting rod and the piston pin and the friction sliding portion between the bore surface of the cylinder block and the piston. It is an object of the present invention to provide a lubrication structure of a hermetic reciprocating compressor that can prevent noise and reduce noise caused by wear.

1 is a cross-sectional view showing the structure of a general hermetic reciprocating compressor;

2 is a cross-sectional view for explaining the lubrication structure of the conventional hermetic reciprocating compressor and the lubrication action by the lubrication structure;

3 is a cross-sectional view corresponding to FIG. 2 for explaining the lubrication structure of the hermetic reciprocating compressor according to the present invention and the lubrication action by the lubrication structure.

4A and 4B are a plan view and a front sectional view showing a piston pin having a fifth flow path, which is a main component of the present invention.

<Description of Symbols for Main Parts of Drawings>

1; crankshaft 2; eccentric

3; connecting rod 4,6; large and small diameter of the connecting rod

5; bearing 7; piston pin

8; cylinder block 9; piston

20; oil pick-up tube 21; main oil euro

22; first oil channel 23; second oil channel

24; 3rd oil euro 25; 4th oil euro

26; 5th oil euro

The lubrication structure of the hermetic reciprocating compressor according to the present invention for achieving the above object is axially penetrated inside the eccentric to communicate with an oil pick-up tube connected to the eccentric portion of the crankshaft to suck in lubricating oil stored at the bottom of the hermetic container. Main oil euros; A first oil passage formed on an outer circumferential surface of the crankshaft eccentric portion so as to communicate with the main oil passage and supplying lubricating oil to a friction sliding portion between the eccentric portion of the crankshaft and the large diameter portion of the connecting rod; A second oil flow path formed on the crank shaft to communicate with the main oil flow path and supplying lubricating oil to the friction sliding portion between the crank shaft and the bearing; A third oil channel formed in the connecting rod to communicate with the first oil channel to supply lubricating oil to the friction sliding part between the small diameter portion of the connecting rod and the piston pin and the bore surface of the cylinder block and the piston; A fourth oil passage formed through one side of the cylinder block so that lubricating oil that lubricates and scatters the friction sliding portion between the crankshaft and the bearing is supplied to the friction sliding portion between the bore inner surface of the cylinder block and the piston; And a fifth oil channel formed in the piston pin so that a part of the oil supplied through the fourth oil channel is supplied to the friction sliding portion between the small diameter portion of the connecting rod and the piston pin.

The fifth oil channel is formed to be inclined from the upper end of the piston pin to the contact surface of the small diameter part of the connecting rod, and is formed of a V-shaped groove.

Such a lubrication structure of the hermetic reciprocating compressor according to the present invention is provided between the small diameter portion of the connecting rod and the piston pin and between the bore inner surface of the cylinder block and the piston through the third oil channel, the fourth oil channel and the fifth oil channel. Since the lubricating oil is supplied to the friction sliding part, the lubrication of this part is performed smoothly, thereby providing the effect of reducing the wear and noise of the member.

Best Mode for Carrying Out the Invention Preferred embodiments of the present invention will now be described based on the accompanying drawings.

3 is a cross-sectional view for explaining the lubrication structure of the hermetic reciprocating compressor according to the present invention and the lubrication action by the lubrication structure, and FIGS. 4A and 4B illustrate a piston pin having a fifth flow path, which is a main component of the present invention. Top and front cross-sectional views shown. For reference, in describing the present embodiment, the same reference numerals refer to the same parts as those in the related art.

As shown in Figures 3 and 4, the lubrication structure of the hermetic reciprocating compressor according to the present invention, by sucking the lubricating oil stored in the bottom of the hermetic container 10 (see Fig. 1) with the oil pickup tube 20 First to fifth oil passages 22, 23, 24, 25, and 26 for supplying to the friction sliding part of the apparatus.

The oil pick-up tube 20 is connected to the eccentric portion 2 of the crankshaft 1, the lubricant stored in the bottom of the sealed container 10 by the centrifugal force by the rotation of the oil pick-up tube 20 is sucked in The first to fifth oil passages 22, 23, 24, 25, and 26 are supplied to the friction sliding parts. The eccentric portion 2 is formed with a main oil passage 21 communicating with the oil pick-up tube 10 in the axial direction of the eccentric portion.

The first oil passage 22 is formed to communicate with the main oil passage 21 at an approximately central portion of the outer circumferential surface of the eccentric portion 2, and is deflected by the lubricating oil supplied through the first oil passage 22. The friction sliding portion between the core portion 2 and the large diameter portion 4 of the connecting rod 3 is lubricated.

The second oil passage 23 is formed in the crankshaft 1 so as to communicate with the main oil passage 21 of the eccentric portion 2, and to the lubricating oil supplied through the second oil passage 23. As a result, the friction sliding portion between the crankshaft 1 and the bearing 5 is lubricated.

The third oil channel 24 is formed to communicate with the first oil channel 22 of the eccentric portion 2 in the connecting rod 3, and is supplied through the third oil channel 24. The friction sliding portion between the small diameter portion 6 of the connecting rod 3 and the piston pin 7 is lubricated by the lubricating oil. The piston pin (7) is formed in a hollow, the lubricating oil flowing through the third oil passage 24 is filled in the hollow friction sliding portion between the bore inner surface of the cylinder block (8) and the piston (9) Is to be lubricated.

The fourth oil passage 25 is supplied to the friction sliding portion between the crankshaft 1 and the bearing 5 through the second oil passage 23 to lubricate, scatter and drop the cylinder. It is formed through one side of the cylinder block 8 to supply to the friction sliding portion between the bore inner surface of the block (8) and the piston (9), thereby friction between the bore inner surface of the cylinder block (8) and the piston (9) The sliding part is supplied with a larger amount of lubricating oil through the existing third oil passage 24 and the fourth oil passage 25, so that lubrication of the portion is performed smoothly. Here, the fourth oil passage 25 is formed to be located behind the piston bottom dead center position of the cylinder block 8, that is, the position which does not affect the compression and suction of the refrigerant.

The fifth oil passage 26 connects a part of the lubricating oil supplied to the friction sliding portion between the bore inner surface of the cylinder block 8 and the piston 9 through the fourth oil passage 25 of the connecting rod 3. The piston pin 7 is formed on the piston pin 7 so as to be supplied to the friction sliding portion between the small diameter portion 6 and the piston pin 7, whereby a part of the lubricating oil supplied through the fourth oil passage 25 is the fifth oil. Since it is supplied to the friction sliding part between the small diameter part 6 and the piston pin 7 of the connecting rod 3 via the flow path 26, the quantity of the lubricating oil of this part increases and lubrication becomes smoothly. Here, the fifth oil passage 26 is formed in the piston pin 7 so as to have a predetermined inclination from the upper end of the piston pin 7 to the portion in contact with the small diameter portion 6 of the connecting rod 3. Preferably, the fifth oil passage 26 may be formed as a groove having an approximately V shape, but is not limited thereto.

In the lubrication structure of the hermetic reciprocating compressor according to the present invention configured as described above, the lubricating oil stored in the bottom of the hermetic container 10 is sucked through the oil pick-up tube 20 as the compressor is driven, and the crankshaft 1 is cut. The main oil flow passage 21 formed in the core portion 2 flows, where a part of the lubricating oil is connected to the eccentric portion 2 and the connecting rod 3 through the first oil flow passage 22 formed in the eccentric portion 2. Is supplied to the friction sliding portion between the large diameter portion 4 of the to lubricate the portion, and part of the crankshaft 1 and the bearing 5 through the second oil passage 23 formed in the crankshaft 1. It is supplied to the friction sliding part between the parts to lubricate this part. In addition, a part of the oil supplied through the first oil passage 22 may be a small diameter part 6 of the connecting rod 3 and the piston pin through the third oil passage 24 formed in the connecting rod 3. It is supplied to the friction sliding portion between the (7) to lubricate this portion, at this time, a part of the lubricant oil through the inner hollow of the piston pin (7) between the bore inner surface of the cylinder block (8) and the piston (9) This part is lubricated by being supplied to the friction sliding part of.

On the other hand, the lubricating oil supplied to the friction sliding portion between the crankshaft 1 and the bearing 5 through the second oil passage 23 lubricates and scatters this portion, so that a part of the lubricating oil falls in this way. Is supplied to the friction sliding portion between the bore inner surface of the cylinder block 8 and the piston 9 through the fourth oil flow passage 25 formed on one side of the cylinder block 8 to be used for lubrication of this portion. That is, the amount of lubricating oil supplied to the friction sliding portion between the bore inner surface of the cylinder block 8 and the piston 9 can be increased than before, so that smooth lubrication can be achieved.

In addition, a part of the lubricating oil supplied to the friction sliding portion between the bore inner surface of the cylinder block 8 and the piston 9 through the fourth oil passage 25 is the fifth oil passage 26 formed in the piston pin 7. It is supplied to the friction sliding portion between the small diameter portion 6 of the connecting rod 3 and the piston pin (7) through, accordingly, between the small diameter portion 6 and the piston pin (7) of the connecting rod (3) By supplying a larger amount of lubricating oil to the friction sliding part, the lubrication of this part can be smoothed.

That is, the existing third oil is provided in the friction sliding portion between the small diameter portion 6 and the piston pin 7 of the connecting rod 3 and the friction sliding portion between the bore inner surface of the cylinder block 8 and the piston 9. In addition to the lubricating oil supply through the flow passage 24, since the additional lubricating oil supply is made through the fourth and fifth oil flow passages, lubrication of each friction sliding part can be made more smoothly.

According to the present invention as described above, since a large amount of lubricant is smoothly supplied to the friction sliding portion between the small diameter portion of the connecting rod and the piston pin and the friction sliding portion between the bore inner surface of the cylinder block and the piston, this friction Wear due to friction between the members of the sliding portion can be reduced, thereby also reducing the noise can be obtained.

That is, according to the present invention, since lubricating oil is smoothly supplied to each friction sliding portion, not only the life of the compressor can be extended but also the efficiency can be expected.

While the invention has been shown and described with respect to preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (3)

A main oil passage axially penetrated inside the eccentric to communicate with an oil pick-up tube connected to the eccentric portion of the crankshaft so as to suck the lubricant stored in the bottom of the sealed container; A first oil passage formed on an outer circumferential surface of the crankshaft eccentric portion so as to communicate with the main oil passage and supplying lubricating oil to a friction sliding portion between the eccentric portion of the crankshaft and the large diameter portion of the connecting rod; A second oil flow path formed on the crank shaft to communicate with the main oil flow path and supplying lubricating oil to the friction sliding portion between the crank shaft and the bearing; And a third oil passage formed in communication with the first oil passage in the connecting rod to supply lubricating oil between the small diameter portion of the connecting rod and the piston pin and the friction sliding portion between the inner surface of the cylinder block and the piston. In the lubrication structure of a hermetic reciprocating compressor comprising: A fourth oil flow passage formed through one side of the cylinder block so as to lubricate and scatter the friction sliding portion between the crankshaft and the bearing to be supplied to the friction sliding portion between the bore inner surface of the cylinder block and the piston; A fifth oil channel formed in the piston pin so that a part of the oil supplied through the fourth oil channel is supplied to the friction sliding portion between the small diameter portion of the connecting rod and the piston pin, The fifth oil passage is inclined from the upper end of the piston pin to the contact surface of the small diameter portion of the connecting rod is lubricated structure of the hermetic reciprocating compressor. delete The method of claim 1, The fifth oil channel is a lubrication structure of a hermetic reciprocating compressor, characterized in that the groove is formed of a substantially V-shape.