Defrosting device of refrigerant loop and rotary compressor for refrigerant loop

Abstract

A defroster restrains a vane jump that takes place when an evaporator is defrosted in a refrigerant circuit using a so-called internal intermediate-pressure type double-stage compression rotary compressor (10). The defroster includes a rotary compressor (10) that discharges a refrigerant gas that has been compressed by a first rotary compressing unit (32) into a hermetic vessel (12) and further compresses the discharged intermediate-pressure refrigerant gas, a gas cooler (154), an expansion valve (156), and an evaporator (157). To defrost the evaporator, the refrigerant gas discharged from the second rotary compressing unit is introduced into the evaporator without decompressing it by the expansion valve. Furthermore, the refrigerant gas discharged from the first rotary compressing unit is introduced into the evaporator. At the same time, an electromotive unit of the rotary compressor is run at a predetermined number of revolutions. The inertial force of a vane at the foregoing number of revolutions is set to be smaller than the urging force of a spring.

Description

technical field [0001] The present invention relates to a defrosting device for a refrigerant circuit and a rotary compressor for the refrigerant circuit, in which a so-called internal intermediate pressure type two-stage compression rotary compressor is used. [0002] The present invention also relates to a rotary compressor, which has an electric unit and first and second rotary compression units driven by the electric unit in a closed container, and the refrigerant gas compressed by the first rotary compression unit is discharged into the airtight container, and the discharged intermediate-pressure refrigerant gas is compressed by the second rotary compression unit. Background technique [0003] In the conventional rotary compressors of this kind, especially in the internal intermediate pressure type multi-stage compression rotary compressors, the refrigerant gas is sucked into the low-pressure chamber side of the cylinder from the suction hole of the first rotary compres...

AI Technical Summary

Problems solved by technology

For this reason, in the past, the pin was fixed to the cylinder by pressing it into the spring hole, but this pressing deformed the protrusion of the cylinder, creating a gap with the support member (bearing) that blocked the opening surface of the cylinder, and it was not possible to secure the inside of the cylinder. The hermeticity, resulting in performance degradation such problems

[0011] Therefore, for example, if the outer diameter of the pin is smaller than the inner diameter of the spring hole to prevent deformation of the cylinder (in this case, it is necessary to prevent the pin from coming out of the airtight container), then the rotary compressor stops and the high-pressure side in the cylinder is closed. When the pressure drops, the intermediate pressure in the airtight container pushes the pin to the spring side, causing the spring to be crushed and malfunctioning of the operation.

[0012] On the other hand, for example, when the outer diameter of the pin is larger than the inner diameter of the spring hole to the extent that the cylinder does not deform, there is a problem that it is difficult to determine where the pin should be inserted in the process of pressing the pin into the spring hole.

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