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Control valve for variable displacement compressor

a compressor and variable-discharge technology, applied in the direction of valve operating means/release devices, machines/engines, positive-discharge liquid engines, etc., can solve the problems of control error, metal dust contained, inability to perform rotational speed control,

Inactive Publication Date: 2005-10-06
TGK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention has been made in view of this point, and an object thereof is to prevent the movable parts of a solenoid of a control valve for a variable displacement compressor, in which a diaphragm is used as a pressure-sensing section, from being adversely affected by metal dust contained in refrigerant.

Problems solved by technology

A compressor used in a refrigeration cycle of an automotive air conditioner is driven by an engine whose rotational speed varies depending on a traveling condition of the vehicle, and hence incapable of performing rotational speed control.
In the control valve having a pressure-sensing section implemented by a diaphragm, the relative pressure between the suction pressure Ps and atmospheric pressure is sensed, and hence due to a change in atmospheric pressure between when the vehicle is running on a road at a high altitude and when the vehicle is running on a road at a low altitude, there occurs a control error.
However, the conventional control valve is configured such that refrigerant flows through the valve section and the solenoid, and hence metal dust contained in the refrigerant circulating through a refrigeration cycle tends to affect the solenoid, particularly movable parts thereof.

Method used

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

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first embodiment

[0020]FIG. 1 is a central longitudinal cross-sectional view of the arrangement of a control valve for a variable displacement compressor, according to the present invention. FIG. 2 is an enlarged fragmentary cross-sectional view showing a welded portion of a diaphragm. FIG. 3 is an enlarged fragmentary cross-sectional view showing a press-fitting portion of a bottomed sleeve.

[0021] This control valve for a variable displacement compressor has a valve section provided at an upper location, as viewed in FIG. 1. The valve section has a body 11, and the body 11 has a side portion thereof formed with a port 12 for communicating with a discharge chamber of the variable displacement compressor when the control valve is mounted in the compressor, to receive discharge pressure Pd from the discharge chamber. The port 12 has a strainer 13 fixed to the periphery thereof. The port 12 for receiving the discharge pressure Pd communicates with a port 14 opening in the center of the top of the body ...

second embodiment

[0038]FIG. 4 is a central longitudinal cross-sectional view of the arrangement of a control valve for a variable displacement compressor, according to the present invention. FIG. 5 is an enlarged exploded cross-sectional view showing a diaphragm and a bottomed sleeve. It should be noted that component elements in FIG. 4 identical or similar in function to those in FIG. 1 are designated by identical reference numerals, and detailed description thereof is omitted.

[0039] The control valve for a variable displacement compressor of the second embodiment is distinguished from the control valve for a variable displacement compressor of the first embodiment in that the shape of the diaphragm 25 is modified. As shown in detail in FIG. 5, the present diaphragm 25 comprises three component parts. First, a base part 40 having a largest diameter has a central portion thereof formed with a hole, and is welded to the flange portion of the bottomed sleeve 21. An intermediate connecting part 41 in t...

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Abstract

To prevent the movable parts of a solenoid of a control valve for a variable displacement compressor, in which a diaphragm is used as a pressure-sensing section, from being affected by metal dust contained in refrigerant. A core, a 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 a vacuum ambience, whereby an assembly that makes the inside a vacuum is formed. As a result, suction pressure Ps can be sensed as an absolute pressure with reference to a vacuum. The movable parts of the solenoid are housed in the vacuum container, so that they are free from the influence of metal dust contained in refrigerant circulating through a refrigeration cycle.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS, IF ANY [0001] This application claims priority of Japanese Application No. 2004-097964 filed on Mar. 30, 2004 and 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 suitable for controlling refrigerant displacement of a variable displacement compressor for an automotive air conditioner. [0004] (2) Description of the Related Art [0005] A compressor used in a refrigeration cycle of an automotive air conditioner is driven by an engine whose rotational speed varies depending on a traveling condition of the vehicle, and hence incapable of performing rotational speed control. To eliminate the inconvenience, a variable displacement compressor capable of changing the discharge amount of refrigera...

Claims

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Application Information

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IPC IPC(8): F04B27/18F04B27/14F04B49/00
CPCF04B27/1804F04B2027/1854F04B2027/1859F04B27/1018F04B39/14F04B49/22F05B2210/12F05B2210/14F16F1/04F16K31/0606Y10S417/00
Inventor HIROTA, HISATOSHI
Owner TGK