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
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.
대표청구항▼
What is claimed is: 1. 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
What is claimed is: 1. 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. 2. The control valve according to claim 1, wherein the vacuum container is a bottomed sleeve that accommodates the core of the solenoid and the first plunger. 3. The control valve according to claim 2, wherein the core is press-fitted in the bottomed sleeve, and a magnetic gap between the core and the first plunger is adjusted by an amount of press-fitting of the core into the bottomed sleeve. 4. The control valve according to claim 3, wherein the bottomed sleeve has a bottom-side portion thereof formed as a part for press-fitting of the core by reducing a diameter of the bottom-side portion. 5. The control valve according to claim 2, comprising a shaft axially extending through the core and having one end thereof fixed to the first plunger, a bearing disposed in contact with a bottom of the bottomed sleeve and supporting the other end of the shaft, and a spring having one end thereof engaged with the shaft and the other end thereof held in abutment with the bearing and urging the first plunger in the direction away from the core, and wherein a position of the bearing receiving the spring is changed by deforming the bottom of the bottomed sleeve from outside such that the bottom is dented, to thereby adjust load of the spring. 6. The control valve according to claim 2, wherein the bottomed sleeve has a magnetic circuit portion thereof having a yoke disposed therearound, the magnetic circuit portion being caused to acquire magnetism such that the magnetic circuit portion forms a magnetic circuit together with the core disposed within the bottomed sleeve. 7. The control valve according to claim 6, wherein the magnetic circuit portion is caused to acquire magnetism by performing cold working thereon such that the bottomed sleeve formed straight is reduced in diameter. 8. The control valve according to claim 7, wherein the magnetic circuit portion is press-fitting portion wherein the core is fixed in the bottomed sleeve. 9. The control valve according to claim 1, wherein the vacuum container has a flange portion formed on an open end thereof, the diaphragm being circumferentially welded to the flange portion along an entire perimeter thereof to seal the vacuum container, and a sealing member for sealing between a space from which the diaphragm receives the suction pressure and the atmosphere is disposed radially inward of a position where the diaphragm is welded. 10. The control valve according to claim 1, wherein the diaphragm comprises a base part formed with a hole in a central portion thereof and welded to a flange portion formed on the open end of the vacuum container, a funnel-shaped intermediate connecting part having an inner periphery welded to an inner periphery of the base part, and a disk having an outer periphery welded to an outer periphery of the intermediate connecting part. 11. The control valve according to claim 1, wherein the vacuum container comprises a sleeve having one open end thereof sealed with the diaphragm and containing the first plunger, and the core disposed such that the core seals the other open end of the sleeve. 12. The control valve according to claim 11, wherein the core has a through hole through which axially extends a shaft in a manner extending through an end face of the core opposed to the first plunger, the shaft having one end thereof fixed to the first plunger, a space in which are arranged a bearing supporting the other end of the shaft, and a spring having one end thereof engaged with the shaft and the other end thereof in contact with the bearing, for urging the first plunger in a direction away from the core, via the shaft, the space being gastightly closed by a closing portion that can adjust load of the spring by receiving an external force from outside to thereby change an axial position of the bearing. 13. The control valve according to claim 12, wherein the closing portion is formed integrally with the core. 14. The control valve according to claim 12, wherein the closing portion is formed by the bearing press-fitted into the space.
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이 특허에 인용된 특허 (3)
Hisatoshi Hirota JP, Capacity controller of capacity variable compressor.
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