Rotary compressor

Abstract

Disclosed is a rotary compressor provided with: a cylinder (30); an eccentric part (31a) of a shaft (31), said eccentric part being disposed inside the cylinder (30); a piston (32) that is fitted around the eccentric part (31a) and has a cylindrical groove (32a) formed therein, the arc angle of said groove being greater than 180 DEG ; the piston (32), inserted in a slot formed in the cylinder (30); the slot (30b) provided in the cylinder (30); the groove (32a) provided in the piston (32); and a vane (33) having a cylindrical part (33a) provided on one end thereof. A compression chamber (39) is formed between the cylinder (30) and the piston (32). The cylindrical part (33a) fits into the groove (32a) so as to be able to swing freely. As the shaft (31) rotates, the vane (33) moves back and forth inside the slot (30b).; The compression chamber (39) is partitioned by the vane (33) into a high-pressure-side space (39b) and a low-pressure-side space (39a). The groove (32a) provided in the piston (32) is formed in a cylindrical shape having an arc angle greater than 180 DEG. An imaginary extension line (La) of the arc is located inwards of an imaginary outer circumference line (Lb) of the piston (32). Thus it is difficult for gas or oil to leak from the high-pressure-side space (39b) of the compression chamber (39) to the low-pressure-side space (39a).

Description

technical field [0001] The present invention relates to a rotary compressor including a vane having a cylindrical portion inserted into an opening formed in a cylinder, whereby a compression chamber is partitioned into a high-pressure side space and a low-pressure side space by the vane. Background technique [0002] Conventionally, in refrigerators or air conditioners, compressors are used to suck in gaseous refrigerant evaporated by an evaporator, compress the sucked gaseous refrigerant to the necessary pressure to condense the sucked gaseous refrigerant, and send high temperature to the refrigerant circuit. High pressure gas refrigerant. As one of such compressors, a rotary piston type rotary compressor (hereinafter simply referred to as a rotary compressor) is known. [0003] Figure 10 It is a partial longitudinal sectional view showing an example of a conventional rotary compressor. in addition, Figure 11 for Figure 10 A cross-sectional view along plane A-A of the...

AI Technical Summary

Problems solved by technology

[0016] However, Figure 12 In the swing piston type rotary compressor shown, a gap must be provided in the swing part of the piston 132 and the vane 133. Therefore, compared with the above-mentioned rotary compressor, gas or lubricating oil can easily flow from the high-pressure side of the compression chamber through the gap in the swing part. Space leakage into low pressure side space

As a result, in the conventional oscillating piston type rotary compressor, there is a problem that the compression loss increases and the efficiency of the compressor decreases.

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