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Control valve for variable displacement compressor

a variable-discharge compressor and control valve technology, which is applied in the direction of machines/engines, positive-discharge liquid engines, lighting and heating apparatus, etc., can solve the problem of inability to perform rotational speed control, and achieve the effect of high sensitivity and stable operation

Inactive Publication Date: 2006-03-02
TGK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The present invention has been made in view of the problem, and an object thereof is to provide a control valve for a variable displacement compressor, which is capable of controlling the variable displacement compressor having high sensitivity stably without causing hunting, even when a rapid change in pressure is caused by a sudden change in the rotational speed of the engine.
[0014] To solve the above problem, the present invention provides a control valve for a variable displacement compressor, which is configured to sense differential pressure between discharge pressure in a discharge chamber of the compressor and suction pressure in a suction chamber of the compressor, and control a flow rate of refrigerant allowed to flow from the discharge chamber into a crankcase to thereby change a discharge capacity of the refrigerant, comprising a pressure-sensing section that senses a change in pressure caused by a rapid change in a rotational speed of the compressor and makes a motion of a valve section in a valve-opening / closing direction slower by a value proportional to a degree of the change in pressure.

Problems solved by technology

A compressor used in the refrigeration cycle of an automotive air conditioner, for compressing refrigerant, uses an engine as a drive source, and hence is incapable of performing rotational speed control.
However, a high-sensitivity variable displacement compressor suffers from the problem of reacting sensitively to rapid changes in the discharge pressure Pd and the suction pressure Ps caused by a sudden change in the rotational speed of the engine, resulting in hunting.

Method used

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  • Control valve for variable displacement compressor
  • Control valve for variable displacement compressor
  • Control valve for variable displacement compressor

Examples

Experimental program
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Effect test

first embodiment

[0026]FIG. 1 is a central longitudinal cross-sectional view schematically showing a control valve for a variable displacement compressor, according to the present invention.

[0027] The control valve 11 comprises a pressure-sensing section 12 that senses a rapid change in discharge pressure Pd, a valve section 13 that senses the differential pressure (Pd−Ps) between the discharge pressure Pd and suction pressure Ps to control the flow rate of refrigerant allowed to flow from a discharge chamber into a crankcase, and a solenoid 14 that is capable of setting a predetermined value to which the differential pressure (Pd−Ps) is to be controlled by the control valve, from outside, these sections being arranged on the same axis.

[0028] A body 15 containing the pressure-sensing section 12 and the valve section 13 has an upper part thereof, as views in FIG. 1, formed with a cylinder 16, and an upper end thereof formed with an opening closed by a lid 17. A high-pressure port 18 which communicat...

second embodiment

[0041]FIG. 3 is a central longitudinal cross-sectional view schematically showing a control valve for a variable displacement compressor, according to a In FIG. 3, component elements having functions identical or equivalent to those of the component elements shown in FIG. 1 are designated by identical reference numerals, and detailed description thereof is omitted.

[0042] As is distinct from the control valve 11 according to the first embodiment which is configured to sense a rapid change in the discharge pressure Pd for control of the valve lift of the valve section 13, the control valve 11a according to the second embodiment is configured to sense a rapid change in pressure Pc supplied to the crankcase for control of the valve lift of the valve section 13.

[0043] To this end, in the control valve 11a according to the second embodiment, the pressure-sensing section 12 is disposed in a space communicating with the medium-pressure port 26, and the pressure-sensing piston 19 that rece...

third embodiment

[0045]FIG. 4 is a central longitudinal cross-sectional view schematically showing a control valve for a variable displacement compressor, according to the present invention. In FIG. 4, component elements having functions identical or equivalent to those of the component elements shown in FIG. 1 are designated by identical reference numerals, and detailed description thereof is omitted.

[0046] As is distinct from the control valve 11 according to the first embodiment which is configured to sense a rapid change in the discharge pressure Pd for control of the valve lift of the valve section 13 and the control configured to sense a rapid change in the pressure Pc supplied to the crankcase for control of the valve lift of the valve section 13, the control valve 11b according to the third embodiment is configured to sense a rapid change in suction pressure Ps for control of the valve lift of the valve section 13.

[0047] To this end, in the control valve 11b, the pressure-sensing piston 19 ...

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Abstract

To provide a control valve for a variable displacement compressor, which is capable of promptly restoring a high-sensitivity variable displacement compressor to a predetermined discharge capacity without causing hunting even when the rotational speed of the compressor is rapidly changed. A valve section controls the flow rate of refrigerant flowing from a discharge chamber to a crankcase, based on the differential pressure between discharge pressure and suction pressure. A pressure-sensing section is provided in a high-pressure port, and when a pressure-sensing piston having a pressure-receiving area larger than that of a valve element is exposed to a rapid change in the discharge pressure, the differential pressure generated between the discharge pressure and pressure in a pressure-adjusting chamber acts on the valve element in a direction opposite to a valve-opening / closing direction, to thereby temporarily make slower the motion of the valve element which is to be opened or closed by the differential pressure between the discharge pressure and the suction pressure. This makes it possible to promptly restore a high-sensitivity variable displacement compressor to a predetermined discharge capacity without hunting.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS, IF ANY [0001] This application claims priority of Japanese Application No. 2004-251287 filed on Aug. 31, 2004 and entitled “CONTROL VALVE FOR VARIABLE DISPLACEMENT COMPRESSOR” and No. 2005-021518 filed on Jan. 28, 2005, entitled “CONTROL VALVE FOR VARIABLE DISPLACEMENT COMPRESSOR”. BACKGROUND OF THE INVENTION [0002] (1) Field of the Invention [0003] The present invention relates to a control valve for a variable displacement compressor, and more particularly to a control valve for a variable displacement compressor, which is mounted on a variable displacement compressor as a component of a refrigeration cycle of an automotive air conditioner, for control of the discharge capacity of the compressor by the differential pressure between discharge pressure and suction pressure. [0004] (2) Description of the Related Art [0005] A compressor used in the refrigeration cycle of an automotive air conditioner, for compressing refrigerant, uses an engin...

Claims

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Application Information

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IPC IPC(8): F04B49/00F04B1/26
CPCF04B2027/1827F04B2027/1854F04B2027/1813F04B27/1804F04B2027/1859F04B49/06F25B1/00F04B27/14
Inventor HIROTA, HISATOSHI
Owner TGK