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Expansion valve

a valve opening degree and valve opening technology, applied in the field of expansion valves, can solve the problems of difficulty in maintaining the characteristic of the valve opening degree within a predetermined characteristic range, and achieve the effect of simple adjustment and increased cos

Inactive Publication Date: 2008-03-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In an expansion valve, it is proposed to adjust the characteristic of the valve opening degree by using an adjustment mechanism before shipment. Further, an adjustment mechanism that enables simple adjustment of the characteristic of the valve opening degree without increasing costs and the number of component parts is desired.
[0008]The present invention is made in view of the foregoing matter, and it is an object of the present invention to provide an expansion valve in which a characteristic of a valve opening degree is adjustable by a simple structure.
[0010]The deformation portion is plastically deformed in the expansion and contraction direction of the spring member by applying an external force. By deforming the deformation portion such that a distance between the valve body and the deformation portion reduces, that is, in a contraction direction of the spring member, the biasing force of the spring member to the valve body increases. On the other hand, by deforming the deformation portion such that the distance between the valve body and the deformation portion increases, that is, in an expansion direction of the spring member, the biasing force of the spring member to the valve body reduces. Namely, by deforming the deformation portion in the expansion and contraction direction of the spring member, the biasing force of the spring member is adjusted. Therefore, the opening degree of the valve body is adjusted to have a predetermined characteristic. In this way, the characteristic of the valve opening degree is properly adjusted by such a simple structure.

Problems solved by technology

If the above situations occur, it is difficult to maintain the characteristic of the valve opening degree within a predetermined characteristic range.

Method used

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second embodiment

[0070]A second embodiment will be described with reference to FIG. 4. In this embodiment, the deformation portion 120 is formed on the bottom wall of the main body block 100. The working surface 120B is provided by a portion of the bottom surface of the main body block 100. The main body block 100 has a tubular projection 140 that extends from the working surface 120B. The tubular projection 140 has a female thread portion 140A on its inner surface, so that the adjustment jig 800 is screwed into the tubular projection 140. The tubular projection 140 is integrally formed with the main body block 100 when the main body block 100 is formed.

[0071]The tubular projection 140 serves an operation portion for displacing the deformation portion 120 in at least one of the upward direction and the downward direction. For example, the tubular projection 140 is located at a center of the deformation portion 120. The tubular projection 140 extends in a direction parallel to the displacement direct...

third embodiment

[0075]A third embodiment of the present invention will be described with reference to FIG. 5. In this embodiment, the main body block 100 has the recessed portion on its bottom, and the deformation portion 120 is provided by the wall that defines the recessed portion. As shown in FIG. 5, the peripheral wall 130 is formed with a female thread portion 130A to which the male thread portion 800A of the adjustment jig 800 is screwed.

[0076]Here, the depth of the recessed portion is greater than that of the first embodiment. Further, the depth of the recessed portion is greater than the diameter of the deformation portion 120.

[0077]The deformation portion 120 is deformed in the upward direction by screwing the adjustment jig 800 into the recessed portion. In this case, the deformation portion 120 can be deformed by a force that is smaller than the force required to simply moving the adjustment jig 800 as the first embodiment. As such, the deformation portion 120 is easily deformed by a sma...

fourth embodiment

[0078]A fourth embodiment will be described with reference to FIG. 6. As shown in FIG. 6, the main body block 100 is formed with an opening portion 150 on its bottom end. The opening portion 150 is located at the bottom of the small diameter passage portion 330 and is in communication with the small diameter passage portion 330. The opening portion 150 is coaxial with the small diameter passage portion 330 and has an inner diameter larger than the inner diameter of the small diameter passage portion 330. Namely, the opening portion 150 is formed at a position opposite to the spool valve 600 and the inner diameter of the opening portion 150 is larger than the outer diameter of the spring member 700.

[0079]Further, a deformation plate member 160 having a shape corresponding to an inner shape of the opening portion 150 is fixed in the opening portion 150 such as in a pressed manner. For example, the deformation plate member 160 has a substantially cup shape. The deformation plate member...

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Abstract

An expansion valve for a refrigerant cycle has an orifice passage portion, a valve body, a spring member and a deformation portion. The orifice passage portion is configured for decompressing and expanding a high pressure refrigerant into a low pressure refrigerant. The valve body is disposed to open and close the orifice passage portion so that a flow rate of the low pressure refrigerant flowing into a low pressure passage portion is controlled in accordance with a valve opening degree. The spring member is disposed between the valve body and the deformation portion for applying a biasing force to the valve body. The deformation portion is plastically deformable in a direction parallel to an expansion and contraction direction of the spring member by applying an external force.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on Japanese Patent Application No. 2006-259438 filed on Sep. 25, 2007, the disclosure of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to an expansion valve for a refrigerant cycle.BACKGROUND OF THE INVENTION[0003]An expansion valve for a refrigerant cycle generally controls a valve opening degree by detecting at least of temperature and pressure of a refrigerant, thereby to control the flow of the refrigerant in the refrigerant cycle. For example, a thermal-type expansion valve that controls a refrigerant to a predetermined condition by detecting the temperature and the pressure of low pressure-side refrigerant is generally known. Also, an expansion valve that controls the refrigerant by detecting a condition of high pressure-side refrigerant is generally known as a pressure control valve.[0004]For example, Japanese Unexamined Patent Publication No. 2002-31053...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B41/06
CPCF25B2341/0683F25B41/062F25B41/335
Inventor HONDA, SHINKOBAYASHI, KAZUTOMOGI, TAKASHI
Owner DENSO CORP
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