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Compressor having a suction throttle valve

a compression valve and throttle valve technology, applied in the field of compression valves, can solve the problems of generating noise, reducing the speed of compression, and reducing the load required for the displacement of the disk spring, so as to achieve the effect of reducing the rate of displacement and increasing the load of the disk spring

Inactive Publication Date: 2008-05-08
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a compressor with a suction throttle valve for adjusting the opening of the suction passage. The valve has a valve body and an urging member, which is a disk spring. The spring characteristics have a range where the load required for displacement of the disk spring is reduced with an increase of displacement of the disk spring. The displacement range of the valve body has a similar range where the load of the disk spring is reduced with an increase of the displacement of the disk spring. This results in a compressor that can efficiently compress air or gas without causing excessive wear and tear on the valve.

Problems solved by technology

When the stop is set for the maximum displacement, the suction reed valve does not open to a sufficient degree to be in contact with the stop when the displacement is small or when the displacement is minimum.
As a result, the suction reed valve generates self-excited vibration to cause suction pulsation, the vibration from which may be propagated to the exterior of the compressor, thereby generating noise.
In this compressor, if the throttling effect by the opening control valve is given priority, the compressor operation at the maximum displacement is influenced by the throttling effect and, therefore, pressure loss is caused in the suction passage, thereby inviting a deterioration in compressing performance.
If the compressing performance during the maximum displacement operation is given priority, on the other hand, sufficient throttling effect of the opening control valve is not obtained during operation at a small displacement.
However, when flow rate is relatively high during operation at a variable displacement, the suction passage is subjected to the throttling effect by the opening control valve.
However, despite the intention, there is another problem that a throttling effect by the opening control valve is produced in the suction passage when flow rate is relatively high during operation at a variable displacement.
In the suction throttle valve using the compression coil spring, if a small load is required when the compression coil spring starts to be displaced, the throttling effect of the suction throttle valve is not obtained sufficiently during operation at a low refrigerant flow rate.

Method used

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  • Compressor having a suction throttle valve
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  • Compressor having a suction throttle valve

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Experimental program
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first embodiment

[0019] The swash plate variable displacement compressor (hereinafter referred to merely as “compressor”) will now be described. In FIG. 1, the left side of the compressor on the drawing corresponds to the front side of the compressor, and the right side of the compressor on the drawing correspond to the rear side of the compressor.

[0020] As shown in FIG. 1, the compressor has a cylinder block 11. The front end of the cylinder block 11 is connected to a front housing 12 and the rear end of the cylinder block 11 is connected to a rear housing 13 through a valve plate assembly 25. The cylinder block 11 has a compression chamber 33 formed therein. The cylinder block 11 and the front housing 12 cooperate to define therein a space as a crank chamber 14.

[0021] The cylinder block 11 and the front housing 12 rotatably support a rotary shaft 15 which extends through the crank chamber 14. The front end of the rotary shaft 15 extends out of the front housing 12 and is connected to a mechanism...

second embodiment

[0052] The following will describe a compressor of the second preferred embodiment according to the present invention with reference to FIG. 4 which is a partially enlarged fragmentary cross sectional view showing the compressor of the

[0053] For convenience of explanation, common or similar elements or parts are designated by the same reference numerals as those used in the first preferred embodiment and, therefore, the description of such similar elements or parts will be omitted and only the modifications will be described.

[0054] As shown in FIG. 4, the compressor of the second embodiment has a suction throttle valve 60. The suction throttle valve 60 has a valve housing 61 including a valve chamber 62 and a communication port 63, a valve seat 65 including a flange 66 and a valve hole 67, a valve body 68 including a valve member 69 and a communication passage 70 and a plurality of disk springs 75. The valve housing 61 of the second preferred embodiment differs from the valve housi...

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PUM

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Abstract

A compressor has a compression chamber formed in a cylinder block, a suction passage formed upstream of the compression chamber and a suction throttle valve formed in the suction passage for adjusting opening of the suction passage. The suction throttle valve has a valve hole and a valve seat formed around the valve hole, a valve body for opening and closing the valve hole and an urging member for urging the valve body in the direction which causes the valve hole to be closed. The urging member is a disk spring. The spring characteristics of the disk spring includes a range where the increasing rate of the load required for displacement of the disk spring is reduced with an increase of displacement of the disk spring. The displacement range of the valve body includes a range where the increasing rate of the load of the disk spring is reduced with an increase of the displacement of the disk spring.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates generally to a compressor, and more particularly to a compressor having a suction throttle valve in a suction passage. [0002] A conventional piston type compressor is equipped with a stop for preventing a suction reed valve of the compressor from being vibrated by self-excitation during suction of refrigerant gas. In the piston type variable displacement compressor, however, the amount of suction gas drawn into the compressor differs between the time of maximum displacement and the time of variable displacement. When the stop is set for the maximum displacement, the suction reed valve does not open to a sufficient degree to be in contact with the stop when the displacement is small or when the displacement is minimum. As a result, the suction reed valve generates self-excited vibration to cause suction pulsation, the vibration from which may be propagated to the exterior of the compressor, thereby generating noise. [00...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B25/00
CPCF04B49/225F04B27/1036F04B39/10F04B39/00
Inventor OTA, MASAKIKURITA, HAJIME
Owner TOYOTA IND CORP