Expansion valve

Patent metadata

Field	Value
Publication number	US-2016223232-A1
Application number	US-201414917407-A
Country	US
Kind code	A1
Filing date	Sep 2, 2014
Priority date	Sep 11, 2013
Publication date	Aug 4, 2016
Grant date	—

Abstract

A power element has a closed space provided between a first diaphragm and a second diaphragm. An interposing member is interposed between the first diaphragm and the second diaphragm. Accordingly, a size of the closed space can be optionally determined in accordance with a shape such as a thickness of the interposing member. Therefore, limitations on the size of the closed space due to a shape of the first diaphragm and the second diaphragm can be reduced. Accordingly, limitations on the size of a fluid enclosing space due to a shape of a diagram can be reduced.

First claim

What is claimed is:

1 . An expansion valve comprising:
an expansion unit that has a first diaphragm and a second diaphragm stacked with the first diaphragm in an axial direction of a uniaxial center, a fluid enclosing space in which an enclosed fluid is sealed being defined between the first diaphragm and the second diaphragm, each of the first diaphragm and the second diaphragm outwardly expanding in the axial direction of the uniaxial center as a pressure inside the fluid enclosing space increases; a first channel through which a flowing fluid flows, the first channel having a decompressing channel to decompress the flowing fluid; and a flow rate control unit that controls a flow rate of the flowing fluid in the first channel in accordance with deformation of the first diaphragm and the second diaphragm in the axial direction of the uniaxial center, wherein the expansion unit includes an interposing member interposed between the first diaphragm and the second diaphragm, and the interposing member is interposed between the first diaphragm and the second diaphragm to define the fluid enclosing space.

2 . The expansion valve according to claim 1 , wherein
the interposing member includes an annular contact surface in contact with a peripheral edge portion of the first diaphragm, and the interposing member is joined to an outer side of the first diaphragm, the outer side of the first diaphragm being outward of an inner peripheral end of the contact surface in a radial direction of the uniaxial center.

3 . The expansion valve according to claim 2 , wherein
the expansion unit includes an annular collar disposed on a side of the first diaphragm opposite to the contact surface of the interposing member in the axial direction of the uniaxial center, and the collar includes a collar contact surface in contact with the first diaphragm, the collar being joined to an outer side of the first diaphragm outward of an inner peripheral end of the collar contact surface in the radial direction of the uniaxial center.

4 . The expansion valve according to claim 3 , wherein
the collar includes a prohibiting portion that prohibits the first diaphragm from expanding to be deformed.

5 . The expansion valve according to claim 4 , wherein
the prohibiting portion extends radially inward from the collar and prohibits the deformation of the first diaphragm by coming into contact with the first diaphragm when the first diaphragm expands to be deformed.

6 . The expansion valve according to claim 1 , wherein
the interposing member has a fluid introduction path to introduce the enclosed fluid into the fluid enclosing space.

7 . The expansion valve according to claim 1 , wherein
the expansion unit has an outer shape symmetrical with respect to a virtual plane that passes through a center of the expansion unit and that is orthogonal to the uniaxial center.

8 . The expansion valve according to claim 1 , further comprising
a second channel through which the flowing fluid flows, the second channel being separate from the first channel, wherein the interposing member has a channel arrangement portion arranged inside the second channel, and at least a portion of the fluid enclosing space is formed inside the channel arrangement portion.

9 . The expansion valve according to claim 8 , wherein
the expansion unit has an adsorbent to adsorb the enclosed fluid, and the adsorbent is positioned inside a portion of the fluid enclosing space included in the channel arrangement portion.

10 . The expansion valve according to claim 8 , wherein
at least one of an inner peripheral surface and an outer peripheral surface of the channel arrangement portion is covered with a member that has thermal conductivity lower than that of the interposing member.

11 . The expansion valve according to claim 1 , further comprising
a body unit that has the first channel defined therein, the body unit accommodating the flow rate control unit, wherein the expansion unit is accommodated inside the body unit.

12 . The expansion valve according to claim 11 , further comprising
a resin-made lid member that isolates the expansion unit from an outer space, wherein the lid member is in contact with the expansion unit.

13 . The expansion valve according to claim 12 , further comprising
a fixed surface that is not movable in the axial direction of the uniaxial center, wherein the flow rate control unit includes an operation member that increases or decreases a flow rate of the flowing fluid in the first channel by being displaced in the axial direction of the uniaxial center, and one of the first diaphragm and the second diaphragm is pressed against the fixed surface in the axial direction of the uniaxial center, and the other of the first diaphragm and the second diaphragm displaces the operation member in the axial direction of the uniaxial center.

14 . The expansion valve according to claim 12 , wherein
the lid member includes a fixed surface that is not movable in the axial direction of the uniaxial center when the expansion unit is operated, the flow rate control unit includes an operation member that increases or decreases a flow rate of the flowing fluid in the first channel by being displaced in the axial direction of the uniaxial center, and one of the first diaphragm and the second diaphragm is pressed against the fixed surface in the axial direction of the uniaxial center, and the other of the first diaphragm and the second diaphragm displaces the operation member in the axial direction of the uniaxial center.

15 . The expansion valve according to claim 1 , wherein
the interposing member includes an interposing portion interposed between the first diaphragm and the second diaphragm in the axial direction of the uniaxial center, a first pinching portion extending from the interposing portion and pinching the first diaphragm with the interposing portion, and a second pinching portion extending from the interposing portion and pinching the second diaphragm with the interposing portion.

16 . The expansion valve according to claim 1 , wherein
a plurality of the expansion unit are stacked with each other in the axial direction of the uniaxial center.

17 . An expansion valve comprising:
a first channel that has a decompressing channel to decompress a flowing fluid, the flowing fluid flowing through the first channel; a first expansion unit in which a first fluid is sealed, the first expansion unit expanding in an axial direction of a uniaxial center as a temperature of the first fluid rises; a second expansion unit that is stacked with the first expansion unit in the axial direction of the uniaxial center and that expands in the axial direction of the uniaxial center as a temperature of the second fluid rises, a second fluid different from the first fluid being sealed in the second expansion unit; and a flow rate control unit that controls a flow rate of the flowing fluid in the first channel in accordance with the expansion of both the first expansion unit and the second expansion unit in the axial direction of the uniaxial center.

18 . The expansion valve according to claim 17 , wherein
an enclosing space, in which the first fluid is sealed, is defined in the first expansion unit, the first expansion unit includes a first diaphragm defining one side of the enclosing space in the axial direction of the uniaxial center, and a second diaphragm defining the other side of the enclosing space, and the first expansion unit expands in the axial d

Assignees

• Denso Corp

Inventors

• Ito Shigeki
• Fukushima Ryu
• Ohta Hiromi

Classifications

• G05D23/1852

  with sensing element expanding and contracting in response to change of temperature · CPC title

• F16K31/002 Primary

  actuated by temperature variation (thermo-electric F16K31/025) · CPC title

• F25B41/062 Primary

  Mechanical Engineering · mapped topic

• F25B41/335

  via diaphragms · CPC title