Variable-capacity compressor

Abstract

A variable-capacity compressor capable of improving starting performance of the compressor and eliminating the risk of the compressor becoming uncontrollable due to contamination or the like in a refrigerant is disclosed. An opening passage allowing the control pressure chamber to communicate with a suction chamber is provided separately from a bleed passage, a valve housing chamber is formed on the opening passage, and the opening passage is formed by including an upstream-side opening passage allowing the control pressure chamber to communicate with the valve housing chamber and a downstream-side opening passage allowing the valve housing chamber to communicate with the suction chamber. A valve body housed so as to open / close the downstream-side opening passage and a biasing means biasing the valve body in an opening direction are provided. The valve housing chamber is connected to the downstream side of a pressure control valve provided on a supply passage.

Description

TECHNICAL FIELD[0001]The present invention relates to a variable-capacity compressor capable of varying a discharge capacity by adjusting a pressure in a control pressure chamber, and particularly relates to a variable-capacity compressor including a supply passage allowing a discharge chamber to communicate with the control pressure chamber and a bleed passage allowing the control pressure chamber to communicate with a suction chamber, in which an opening degree of the supply passage is adjusted by a control valve provided on the supply passage to thereby adjust the pressure in the control pressure chamber.BACKGROUND ART[0002]The variable-capacity compressor adopts a mechanism in which a tilt angle of the swash plate is changed and piston stroke amounts are adjusted by adjusting the pressure of the control pressure chamber to thereby vary the discharge capacity. As such compressor, a structure is known, in which the discharge chamber is allowed to communicate with the control press...

AI Technical Summary

Benefits of technology

The present invention provides a variable-capacity compressor that can adjust its opening degree to control refrigerant flow. By using a valve housing chamber and a valve body to open or close the downstream-side opening passage, the compressor can smoothly discharge refrigerant and increase its starting performance. When the pressure in the discharge chamber increases, the valve body moves to block the downstream-side opening passage, reducing the flow of refrigerant and avoiding an increase in internal circulating refrigerant that can lead to decreased performance. The valve body is positively operated based on the pressure on the downstream side of the control valve, eliminating the risk of uncontrollable valve behavior due to contamination.

Problems solved by technology

Accordingly, there has been known an inconvenience that the pressure in the control pressure chamber is not reduced until all the liquid refrigerant is vaporized and is discharged from the bleed passage and it is difficult to perform control of the discharge capacity (to increase the discharge capacity).

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