Control valve for variable displacement compressor

A technology of positive displacement compressor and control valve, applied in the field of control valve, can solve problems such as oscillation

CN1743672AInactive Publication Date: 2006-03-08TGK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2006-03-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

A valve section of a control valve controls the flow rate between a discharge chamber and a crankcase, based on the differential pressure between discharge pressure Pd and suction pressure. A pressure-sensing section is provided in a high-pressure port. When a pressure-sensing piston having a pressure-receiving area larger than a valve element is exposed to a rapid discharge pressure change, the differential pressure generated between the discharge pressure and a pressure in a pressure-adjusting chamber acts on the valve element opposite to the valve-opening / closing direction, to temporarily retard the motion of the valve element which opens or closes by the differential pressure. Even a high-sensitivity variable displacement compressor promptly restores without hunting to a predetermined discharge capacity.
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Description

technical field

[0001] The present invention relates to a control valve for a variable displacement compressor, and more particularly to such a control valve for a variable displacement compressor installed in a variable On positive displacement compressors, it is used to control the discharge capacity of the compressor by the pressure difference between the discharge pressure and the suction pressure. Background technique

[0002] A compressor used in a refrigerating cycle of an automobile air conditioner is used to compress refrigerant, and the compressor uses an engine as a driving source, and thus cannot perform rotational speed control. In order to eliminate this inconvenience, a variable displacement type compressor that can change the refrigerant compression capacity is used so as to obtain sufficient cooling capacity regardless of the engine speed.

[0003] In this variable displacement compressor, a wobble plate mounted on a shaft driven by an engine has a compress...

Examples

Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] 1 is a central longitudinal sectional view schematically showing a control valve for a variable displacement compressor according to a first embodiment of the present invention.

[0024] The control valve 11 includes: a pressure sensing portion 12 which senses a rapid change in the discharge pressure Pd; a valve portion 13 which senses the pressure difference (Pd-Ps) between the discharge pressure Pd and the suction pressure Ps, thereby controlling the The flow rate of refrigerant flowing from the discharge chamber into the crankcase; and the solenoid 14, which can be set from the outside to a predetermined value to which the differential pressure (Pd-Ps) is controlled by the control valve, are along the arranged on the same axis.

[0025] The main body 15 including the pressure sensing part 12 and the valve part 13 has a cylinder 16 formed in it...