Multi-cylinder rotary compressor and refrigeration circulation device

Abstract

The present invention relates to a multi-cylinder rotary compressor and a refrigeration circulation device, wherein the multi-cylinder rotary compressor can realize improvement of manufacturing performance and machining precision. The refrigeration circulation device comprises the multi-cylinder rotary compressor for realizing increase of the refrigeration circulation efficiency. In the multi-cylinder rotary compressor (C), a first cylinder (6A) and a second cylinder (6B) which are separated by a middle baffle (2) are provided as a compression mechanism part (3). Cylinder chambers (Sa,Sb) for introducing low-pressure gas are provided at the inner-diameter part. The blade back chambers (11a,11b) are provided on each cylinder chamber through blade grooves (10a,10b) which movably accommodate the blades (12a,12b). The first blade back chamber comprises a spring component (13) which exerts an elastic force to the back end of the blade and causes the front end of the blade to contact with a circumferential wall of a roller (9a). The second blade back chamber is closed by a closing component (15) and a middle baffle, wherein the closing component is formed separately from the auxiliary bearing. The closing component is connected with a pressure control pipe (16) for switching the high-pressure gas and the low-pressure gas for supplying, and is also provided with a guiding path (17) for communicating the closing component with the second blade back chamber.

Description

Technical field [0001] The present invention relates to a multi-cylinder rotary compressor with switchable compression capability and a refrigeration cycle device including the multi-cylinder rotary compressor to form a refrigeration cycle. Background technique [0002] In refrigeration cycle devices, multi-cylinder rotary compressors including a plurality of (mainly two) cylinder chambers in the compression mechanism are often used. In this type of compressor, it is advantageous if it can switch between full-capacity operation and half-capacity operation. Among them, full-capacity operation refers to simultaneous compression in multiple cylinder chambers, and half-capacity operation is Refers to performing compression in one cylinder chamber and stopping compression in the other cylinder chamber to reduce compression work. [0003] The multi-cylinder compressor (variable capacity type rotary compressor) disclosed in Patent Document 1 includes: a roller (rotating piston) that rota...

AI Technical Summary

Problems solved by technology

[0010] However, the intermediate partition and the bearing have the above-mentioned deformed shapes, and thus it takes a lot of time and effort to manufacture them.

In addition, since the inner diameter hole of the intermediate partition plate only needs to be a diameter that can pass through the eccentric portion of the rotating shaft in which the roller is fitted during assembly, machining accuracy is not required, but the inner diameter of the bearing that pivotally supports a part of the rotating shaft The hole must support the shaft without center runout, thus requiring high machining accuracy

[0011] In particular, when machining the inner diameter hole of the bearing, due to the deformed shape, it is difficult to perform chucking for accurate centering, and rotation imbalance occurs, resulting in poor finishing dimensional accuracy

[0012] Although the above-mentioned disadvantages can be eliminated by simply extending the shape of the bearing to the apex of the extension part and making it into a simple circle, on the contrary, it will lead to disadvantages such as cost of materials and increase in weight.

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