Variable displacement compressor

Abstract

A variable displacement compressor capable of controlling a piston stroke by openably controlling a displacement control valve to regulate a pressure in a crank chamber, comprising the displacement control valve disposed in a passageway from a discharge chamber to the crank chamber, and a fixed orifice provided in a passageway from the crank chamber to a suction chamber, the displacement control valve further comprising a pressure sensing member for the pressure in the suction chamber or the crank chamber, a valve element having a valve part opened and closed in response to the operation of the pressure sensing member, a valve chamber for disposing the valve part therein and allowing the pressure in the crank chamber to act therein, a partition wall disposed around the valve element, a pressure chamber partitioned from the valve chamber by the partition wall and allowing the pressure in the suction chamber to act therein, and a solenoid provided to the other end of the valve element, wherein a flow passage of non-contact structure is formed in the partition wall, and the number of sliding parts is reduced to lower a sliding resistance.

Description

technical field [0001] The present invention relates to a variable displacement compressor used in a vehicle air conditioner, etc., and particularly relates to a variable displacement compressor capable of achieving a highly reliable operation with a smooth capacity control valve and simplifying the processing of the compressor as a whole. Background technique [0002] As a variable displacement compressor installed in a refrigerating circuit such as an air conditioner for a vehicle, for example, a compressor disclosed in JP-A-11-107929 is known. In such a variable displacement compressor, in order to control its discharge capacity, it is important to determine the control point of the suction chamber pressure with respect to the energization amount of the electromagnetic actuator, and to set a control point to forcibly maintain the variable displacement compressor in a non-energized state. Volume control valve at minimum capacity. [0003] This capacity control valve has ...

AI Technical Summary

Problems solved by technology

Therefore, when the control valve body 118 moves in the axial direction, since sliding resistances are generated on the respective sliding parts, if these sliding resistances are large, the operation of the valve body 118 may be deteriorated.

Furthermore, since the four sliding parts are arranged in the coaxial direction, it may be difficult to maintain the respective sliding parts in a predetermined positional relationship with high precision without axial deviation, which may increase the sliding resistance.

If the operation of the valve body 118 deteriorates due to such sliding resistance, it may hinder the smooth discharge capacity control of the variable displacement compressor.