Control valve for variable displacement compressor
AssigneeTgk Co., Ltd.
InventorHisatoshi Hirota
Life of this patent
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Abstract
To provide a control valve for a variable displacement compressor using a diaphragm for a pressure-sensing section, which is capable of sensing suction pressure as absolute pressure. A core, a first plunger, and a spring of a solenoid are accommodated in a bottomed sleeve. A diaphragm is welded to an open end of the bottomed sleeve under vacuum atmosphere, whereby an assembly having a vacuum inside is formed. As a result, suction pressure Ps can be sensed as an absolute pressure with reference to a vacuum. The magnetic gap between the first plunger and the core is adjusted by the amount of press-fitting of the core into the bottomed sleeve, and the adjustment of load of the spring incorporated into the bottomed sleeve is made by deforming the bottom of the bottomed sleeve such that it is dented inward.
Claims14
A control valve for a variable displacement compressor, which is mounted on the variable displacement compressor for control of pressure in a gastightly-formed crankcase by sensing suction pressure, comprising:
- a vacuum container that contains a first plunger in a state urged in a direction away from a core of a solenoid;
- a diaphragm for sensing the suction pressure, the diaphragm sealing an open end of the vacuum container such that an inside of the vacuum container is kept gastight and having an inner surface with which the first plunger is in abutment in an urged state;
- and
- a second plunger that is disposed between the diaphragm and a valve section for controlling pressure in the crankcase, and urged in a direction away from the diaphragm such that the second plunger opens the valve section when the solenoid is not energized,
- wherein the first plunger and the second plunger are magnetically coupled via the diaphragm when the solenoid is energized.
Dependencies are inferred from the claim text.