Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Control valve for variable capacity compressor

a variable capacity compressor and control valve technology, which is applied in the direction of valve operating means/release devices, machines/engines, positive displacement liquid engines, etc., can solve the problems of increased hysteresis in the valve opening, difficult to obtain high straightness in the bellows, and poor control

Inactive Publication Date: 2004-05-13
FUJIKOKI CORP
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] The invention relates to a control valve for a variable capacity compressor, which comprises a bellows main body retained as a pressure sensing element in a bellows case with an airtight structure and transfers expansion and contraction of the bellows main body in response to a variation in inlet pressure of the variable capacity compressor to a valve element through a valve rod supported to be movable in a valve lifting direction from a valve housing integral with the bellows case to thereby change a valve opening degree.
[0017] With the control valve for the variable capacity compressor according to the invention, it is possible to minimize hysteresis in valve opening / closing operation and to enhance accuracy in the valve opening / closing operation even if straightness of the bellows is somewhat poor.

Problems solved by technology

However, in general, it is hard to obtain high straightness in a bellows because of a structure of the bellows.
As a result, the force perpendicular to the valve lifting direction is transferred to a valve rod to thereby cause an increase in hysteresis in valve opening / closing operation, poor control, and deterioration in a valve opening / closing accuracy.

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

first embodiment

[0021] First, a control valve according to the present invention will be described by referring to FIG.

[0022] The control valve 10 shown in FIG. 1 is inserted and fixed into a control valve mounting hole formed in a housing of a variable capacity compressor (not shown) as a flow control valve for a flow rate of a refrigerant from a discharge pipe for the refrigerant to a crankcase.

[0023] The control valve 10 is formed of a tubular valve housing 11, an end cap 12 mounted to an upper end of the valve housing 11, and a bellows case 13 connected to a lower end of the valve housing 11 by caulking.

[0024] An assembly of the valve housing 11 and the end cap 12 is formed of a valve chest 14, a valve port 16 defined by a valve seat portion 15, a first port 17 formed on one side of the valve port 16, a spring receiving seat 23 disposed on the other side of the valve port 16 through the valve chest 14, a second port 18 formed in the spring receiving seat 23, and a valve rod retaining hole 19. T...

second embodiment

[0041] Next, a control valve according to the invention will be described by referring to FIG. 2. In FIG. 2, components similar to those shown in FIG. 1 (first embodiment) are denoted by similar reference numerals.

[0042] The control valve 10' of the embodiment is different from the control valve 10 of the first embodiment in (1) a shape of a patch member 31' and (2) shapes of a bellows case 13', a lower patch member 28', and an adjusting screw member 33' for supporting the lower patch member 28'.

[0043] With regard to the above difference (1), in the present embodiment, a large-diameter portion 31'd formed in a midway position between the base portion 31'c and a fitting recessed portion 31'b of the patch member 31' is formed to be deeper than the large-diameter portion 31d in the first embodiment. By an amount by which the large-diameter portion 31'd is made deeper, the fitting recessed portion 31'b of the patch member 31' is made shallower. Therefore, a length of a portion of the va...

third embodiment

[0048] Next, a control valve according to the invention will be described by referring to FIG. 3. In FIG. 3, components similar to those shown in FIG. 1 (first embodiment) are denoted by similar reference numerals.

[0049] Similarly to the control valve 10 in FIG. 1 (first embodiment), the control valve 10" shown in FIG. 3 includes as a pressure sensing element the bellows main body 27 retained in the bellows case 13 with an airtight structure and expansion and contraction of the bellows main body 27 in response to variations in the inlet pressure Ps of the variable capacity compressor are transferred to the ball valve 21 through the valve rod 25" supported in the valve rod retaining hole 19 formed in the valve housing 11 integral with the bellows case 13 to thereby change the valve opening degree.

[0050] The control valve 10 is similar to the above-described first embodiment in that (1) the patch member 31 is provided to the movable-side end portion of the bellows main body 27 and the...

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

In a control valve for a variable capacity compressor, a patch member is provided to a movable-side end portion of a bellows main body. A valve rod is fitted in the fitting recessed portion formed in the patch member. A compression coil spring is disposed between the patch member and a lower patch member for supporting a fixed-side end portion of the bellows main body.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a control valve for a variable capacity compressor.[0003] 2. Description of the Related Art[0004] It is disclosed in Japanese Utility Model Publication No. 02-37001 to use a bellows pressure response valve as a capacity control valve provided to a variable capacity compressor and the like. The bellows pressure response valve has an advantage in that it is small and that a long pressure responding stroke can be obtained as compared with a diaphragm pressure response valve.[0005] However, in general, it is hard to obtain high straightness in a bellows because of a structure of the bellows. Therefore, if the bellows is winding with respect to a valve lifting direction, a force perpendicular to the valve lifting direction arises when the bellows expands and contracts in the valve lifting direction. As a result, the force perpendicular to the valve lifting direction is transferred to a valve rod to thereby cause an i...

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
IPC IPC(8): F04B49/00F04B27/14F04B27/18F16K31/126
CPCF04B27/1804F04B2027/1859F04B2027/1827F04B2027/1813
Inventor KAINUMA, HIROSHITOMARU, MASAKIIMAI, MASAYUKIKATO, SHINSUKE
Owner FUJIKOKI CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com