External control valve of variable displacement compressor

Abstract

The invention relates to an external control valve of a variable displacement compressor. The external control valve comprises a valve body, wherein a connector is arranged at the top of the valve body, a split washer is arranged between the connector and the valve body, a first O-shaped seal ring is sleeved on the outer side of the middle part of the connector, a valve rod is inserted into the interior of the connector, the top of the valve rod is connected with a core iron, a coil assembly is arranged at the outer side of the core iron, the bottom of the valve rod extends to the interior of the valve body, a first through hole is arranged at the top of the valve body, two second O-shaped seal rings are arranged in two grooves at the outer side of the middle part of the valve body, and a second through hole is arranged between the two second O-shaped seal rings. The invention has the beneficial effect that: by changing the pulse quantity applied to a stepping motor, a transmission rod moves upwards and downwards, therefore, the opening degree of the control valve is changed so as to satisfy the requirements on different refrigerating agent flows; the external control valve has the advantages of sufficient driving force, wide controllable range, favorable linear relationship between pulse signals and the opening degree, high reaction speed and good heat dissipation; and a working medium loop is in a closed structure and separated from an electric loop, therefore, the external control valve is safe and reliable.

Description

technical field [0001] The invention relates to an external control valve of a variable displacement compressor. Background technique [0002] In automotive air-conditioning and refrigeration systems, variable displacement compressors are widely used due to their ability to adjust steplessly variable capacity. The variable displacement compressor uses the control valve to adjust the piston stroke of the compressor, and then changes the displacement of the compressor to realize the capacity adjustment of the refrigeration system. Variable displacement compressors can be divided into two categories: internal control and external control. The internal control compressor mainly adopts a pneumatic internal control valve, which is driven by the compressor crankcase and the suction pressure difference to adjust the compressor piston stroke. Since this type of control valve is mainly operated by the operating characteristics of the compressor itself (including the suction and disc...

AI Technical Summary

Problems solved by technology

At present, the external control valves at home and abroad all adopt the electromagnetic drive mode. Although the structure is simple and the volume is small, there are disadvantages such as small electromagnetic force, serious magnetic flux leakage, serious electromagnetic mutual inductance, slow response speed, long degaussing time, and difficult heat dissipation. It greatly affects the displacement control quality of the variable displacement compressor

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