Unlock instant, AI-driven research and patent intelligence for your innovation.

Control valve for variable capacity compressor

A technology for compressors and control valves, which is applied in the direction of liquid variable displacement machinery, variable displacement pump components, pump control, etc., and can solve problems such as the increase in the number of components, the positional deviation of steel balls and lower cover components, etc.

Inactive Publication Date: 2004-05-26
FUJIKOKI MFG CO LTD
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, according to the above-mentioned known example, since the expansion and contraction of the bellows is transmitted to the valve body through the ball joint structure composed of steel balls and the lower cover member, there is a problem that not only the steel ball is caused during the expansion and contraction of the bellows The position of the ball and the lower cover part is shifted, and the number of parts is also increased, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control valve for variable capacity compressor
  • Control valve for variable capacity compressor
  • Control valve for variable capacity compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiments of the present invention will be described below with reference to the drawings. figure 1 It is a vertical cross-sectional view of the control valve according to Embodiment 1 of the present invention. In addition, in the following description, expressions of up, down, left, and right are expressions for the convenience of explaining the structure in the drawings, and are not actually limited to the positional relationship as described above. In addition, arrows in the figure indicate the flow direction of the refrigerant. The control valve 10 of Embodiment 1 is a control valve that is inserted and fixed on the housing of a variable displacement compressor (not shown) as a flow control valve for the flow rate of refrigerant flowing from the discharge pipe of the refrigerant to the crankcase. in the mounting hole. The control valve 10 has a cylindrical valve housing 11 , an end cover 12 attached to the upper end of the valve housing 11 , and a bellows cover ...

Embodiment 2

[0037] Below, refer to figure 2 Example 2 will be described. In the description of Embodiment 2, for the same structural components as Embodiment 1, by figure 2 The same reference numerals are given as in , and descriptions thereof are omitted.

[0038] The difference between the control valve 10' of the second embodiment and the control valve 10 of the first embodiment is that the shape of the gland member 31', that is, the contact end 25a on the side of the stem 25' that supports the fitting recess 31'b The length is made shorter (point 1), and the bellows 13', the lower gland part 28' and the shape of each piece of the adjustment screw part 33' supporting the lower gland part 28' (point 2) .

[0039] That is, regarding the first point, in the capping member 31', the large-diameter portion 31'd formed between the bottom plate portion 31'c and the fitting recess 31'b is shortened. As a result, the degree of freedom of inclination of the gland member relative to the valv...

Embodiment 3

[0044] Below, refer to image 3 The control valve 10'' of Embodiment 3 will be described. In the description of Embodiment 3, for the same structural components as in Embodiment 1, in image 3 in giving with figure 1 The same reference numerals are used to omit descriptions thereof.

[0045] In the control valve 10" of embodiment 3, it is the same as embodiment 1 in the following points, one of which is the structure of the control valve of embodiment 1, that is, as a pressure sensing element, it has a bellows with a closed structure The bellows main body 27 supported by the bellows cover 13 will be accompanied by the suction pressure Ps of the variable displacement compressor through the valve stem 25 movably supported in the valve lift direction by the valve housing 11 integrally made with the bellows cover 13. The telescopic transfer ball valve 21 of the above-mentioned bellows main body 27 produced by the variation of the above-mentioned bellows main body 27, in the cont...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This control valve has a bellows body 27 held in a bellows case 13 of a sealed structure. A valve opening quantity is changed by transmitting the extension-contraction of the bellows body 27 caused by a change in suction pressure Ps of a variable displacement compressor to a valve element via a valve rod 25 movably supported in the valve lift direction by a valve housing integral with the bellows case. A wear plate member 31 is arranged in a moving side end part of the bellows body 27, and a fitting recessed part 31b is formed in the wear plate member 31. The valve rod 25 is loosely movably fitted to the fitting recessed part 31b. A compression coil spring 30 is interposed between the wear plate member 31 and a lower wear plate member 28 for supporting a nonmoveable side end part of the bellows body 27.

Description

technical field [0001] The present invention relates to a control valve for a variable displacement compressor. Background technique [0002] Patent Document 1 (Japanese Utility Model Publication No. 02-37001) discloses the use of a bellows type pressure actuated valve as a displacement control valve provided in a variable displacement compressor or the like. Bellows type pressure actuated valves have the advantage over diaphragm type pressure actuated valves that a long pressure response stroke can be obtained with a small volume. [0003] However, in general, the structure of the bellows is difficult to obtain high straightness. When the bellows snakes with respect to the valve lift direction, a lateral force is generated when the bellows expands and contracts in the valve lift direction. Since the lateral force is transmitted to the valve core, the valve Increased hysteresis in the switching action, etc., becomes an important factor of poor control and leads to a decreas...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/00F04B27/14F04B27/18F16K31/126
CPCF04B2027/1813F04B2027/1827F04B2027/1859F04B27/1804
Inventor 海沼广司登丸直树今井正幸加藤真介
Owner FUJIKOKI MFG CO LTD