JP2535208Y2 - Rotary compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a rotary compressor capable of preventing refrigerant from leaking and preventing lubricating oil from flowing into a cylinder chamber more than necessary.

[0002]

2. Description of the Related Art Generally, a rotary compressor employed in a refrigerator is provided with blades for partitioning a cylinder chamber into a low pressure side and a high pressure side, and the blades extend along blade grooves formed in a cylinder block. It is housed so that it can reciprocate freely. Since this blade slides along the blade groove wall, in order to improve lubricity,
The formation of an oil groove in a blade or a blade groove wall has already been proposed in Japanese Utility Model Laid-Open No. 60-78995 and Japanese Utility Model Laid-Open No. 61-126097.

For example, FIG. 6 shows a "compressor" proposed in Japanese Utility Model Laid-Open Publication No. 61-126097. In this compressor, a blade groove 4 for guiding the movement of a blade 3 is formed in a cylinder block 2 that partitions a cylinder chamber 1, and an oil sump groove 6 is formed in a groove wall 5 of the blade groove 4. An oil passage 7 immersed in oil stored at the bottom of the case is connected to the oil reservoir groove 6.

[0004]

[Problems to be solved by the invention] By the way, the blade 3
Or, if an oil groove is formed in the groove wall 5, a pressure imbalance occurs through the oil groove. That is, in the above proposal, when the oil sump groove 6 is formed on the high-pressure side surface of the blade 3, the blade 3 is inserted through the oil sump groove 6.
In this case, a pressure difference is generated on both end faces of the cylinder, and the refrigerant leaks to the outside of the cylinder chamber 1. On the other hand, if the refrigerant is formed on the low pressure side face, oil flows into the high pressure side more than necessary. Was.

The present invention has been made to effectively solve the above problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary compressor capable of preventing refrigerant from leaking and preventing lubricant oil from flowing into a cylinder chamber more than necessary.

[0007]

SUMMARY OF THE INVENTION The present invention provides a rotary compressor in which a blade is reciprocated along a blade groove formed in a cylinder block to partition the cylinder chamber into a low pressure side and a high pressure side. Are formed in the thickness direction, and an open groove is formed to open the open end of the through hole into the blade groove.

[0008]

By forming a through hole in the cylinder block and opening the through hole to the blade groove through the open groove, both end surfaces of the blade communicate with each other through the through hole to generate in the cylinder chamber. Pressure fluctuations and the like can be absorbed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 4 shows, for example, a horizontal rotary compressor. As shown in the figure, a closed case 12 is provided in the compressor 11.
Inside 2 is accommodated an electric element 14 provided at one end of the crankshaft 13 and a compression element 15 provided at the other end of the crankshaft 13. Sealed case 12
The lubricating oil A is stored at the bottom.

As shown in FIGS. 1 and 5, the compression element 15 is provided with a cylinder block 17 defining a cylinder chamber 16, and a main bearing 18 which supports the crankshaft 13 with the cylinder block 17 interposed therebetween. A sub bearing 19 is provided. A roller 22 is fitted into the eccentric portion 21 formed on the crankshaft 13 so as to surround the eccentric portion 21. As shown in FIG.
The blade 23 that partitions the cylinder chamber 16 into a low pressure side and a high pressure side comes into contact with each other. This blade 23
Are elastically supported by a cylinder block 17 so as to reciprocate along a blade groove 24 opened toward the cylinder chamber 16.

In particular, a through hole 25 is formed in the cylinder block 17 so as to penetrate the cylinder block 17 in the thickness direction.
5 has a circular cross section having a diameter larger than the groove width of the blade groove 24 as shown in FIGS. The cylinder block 17 has two open ends 25a, 2
Open grooves 26 and 27 for opening 5b to the blade groove 24 are formed. As shown in FIG. 3, the open grooves 26 and 27 have a rectangular cross section formed at a relatively shallow depth.

Therefore, the compression element 15 performs a process of sucking, compressing, and discharging the gas refrigerant.
End faces 23a, 23b of blade 23 in contact with 8, 19
Pressure difference occurs on the side, or a momentary pressure fluctuation occurs in the cylinder chamber 16, these pressure differences and the pressure fluctuation are transmitted through the through-hole 25 passing through the cylinder block 17 through the open grooves 26 and 27. Will be absorbed. That is, since the through holes 25 having relatively large diameters opened through the open grooves 26 and 27 are formed on both end surfaces of the blade 23, the end surfaces 23 of the blade 23 are formed through the through holes 25.
The a and 23b sides are communicated with each other to balance the pressure, and instantaneous pressure fluctuations are absorbed.

Therefore, in the present invention, it is possible to prevent the refrigerant from leaking out of the cylinder chamber 16 and prevent the lubricating oil A from flowing into the low pressure side of the cylinder chamber 16 as in the prior art. In addition, it is possible to prevent the bearings 18 and 19 from being worn by direct contact of the both end surfaces 23a and 23b of the blade 23 with the bearings 18 and 19.

Further, in the present invention, after a cylinder block which is generally used is formed, a through hole 25 is formed, and the cylinder block 17 is formed only by cutting a part from the open end of the through hole 25 to the blade groove. Since it can be formed, a groove can be provided in the blade itself as in the related art, and processing can be easily performed as compared with a method in which the inside of the blade groove is processed.

[0016]

In summary, according to the present invention, since a through hole is formed in the cylinder block and an open groove for opening the open end of the through hole to the blade groove is formed, refrigerant leakage and lubricating oil are required. As described above, it is possible to prevent the gas from flowing into the cylinder chamber, and it is possible to prevent the wear of the bearing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of the rotary compressor of the present invention.

FIG. 2 is a sectional view showing a main part of FIG.

FIG. 3 is a view taken along line AA of FIG. 2;

FIG. 4 is a sectional view showing a rotary compressor.

FIG. 5 is a sectional view showing a main part of FIG. 4;

FIG. 6 is a schematic diagram showing a conventional example.

[Explanation of symbols]

 17 Cylinder block 23 Blade 24 Blade groove 25 Through hole Open end 25a, 25b 26, 27 Open groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotary compressor for reciprocating a blade along a blade groove formed in a cylinder block to partition a cylinder chamber into a low pressure side and a high pressure side, and penetrates the cylinder block in the thickness direction. A rotary compressor having a through hole and an open groove for opening an open end of the through hole into the blade groove.