JP2018035866A - Expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion valve capable of suppressing generation of noise caused by vibration of a valve member without wearing inside of a valve body.SOLUTION: An expansion valve includes: a power element having an upper lid member, a reception member and a diaphragm sandwiched between the upper lid member and the reception member; a valve body having an inlet port, a valve chamber communicated with the inlet port, a valve hole communicated with the valve chamber, an outlet port communicated with the valve hole, and a valve seat and a power element mounting portion that are formed in an opening on the valve chamber side of the valve hole; a valve member disposed to come into contact with the valve seat; a support member for supporting the valve member; a coil spring provided in the valve chamber to energize the support member toward the valve hole; a valve rod mounted to the power element to drive the valve member; and a vibration isolation spring that is fixed into the valve chamber and with which an outer peripheral surface of the support member comes into slidable contact.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a temperature sensing mechanism built-in type expansion valve used in a refrigeration cycle, and more particularly to an expansion valve having a power element attached to a valve body.

Conventionally, for refrigeration cycles used in air conditioners installed in automobiles, a temperature expansion valve with a built-in temperature sensing mechanism that adjusts the refrigerant flow rate according to the temperature is used to save installation space and piping work. Has been. The valve body of such an expansion valve has an inlet port into which high-pressure refrigerant is introduced and a valve chamber communicating with the inlet port, and a valve member drive mechanism called a power element is provided on the top of the valve body. Is done.
A spherical valve member disposed in the valve chamber is opposed to the valve seat in the valve hole that opens to the valve chamber, and is operated by a valve rod driven by a power element to open a throttle passage between the valve seat and the valve seat. Control the degree.
Moreover, the refrigerant | coolant which passed the valve hole is sent to an evaporator side from an exit port. The refrigerant returning from the evaporator to the compressor side passes through a return passage provided in the valve body.

The power element is composed of an upper lid member that forms a pressure working chamber, a thin diaphragm that is elastically deformed under pressure, and a disk-shaped receiving member. The three members are overlapped and the circumference is joined by TIG welding means, etc. Formed.
A working gas is enclosed in a pressure working chamber formed by the upper lid member and the diaphragm. At this time, in order to enclose the working gas in the pressure working chamber, a hole is provided in the top of the upper lid member, and after filling the working gas from this hole, the hole is closed with a steel ball or the like, and the pressure working chamber is sealed by projection welding means or the like. Stop.

In the expansion valve as described above, when a high pressure refrigerant is introduced into the valve chamber from the inlet port and a high pressure is applied to the back side of the support member that supports the valve member in a short time, Since a force in a direction orthogonal to this is loaded, vibration is likely to occur in the valve member, and noise may be generated accordingly.
In order to suppress this noise, an expansion valve provided with a vibration-proof spring that suppresses vibration of a support member that supports the valve member is known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2005-156046

In the expansion valve described in Patent Document 1, the vibration-proof spring includes a disc portion and a plurality of legs extending radially from the outer periphery of the disc portion, and one end of the plurality of legs is a valve chamber. The vibration damping structure elastically supports the support member in the valve chamber by contacting with the inner surface of the valve chamber.
By the way, the anti-vibration spring is made of a relatively stiff material (hard material) such as stainless steel or its alloy in order to improve its durability, while the valve body reduces the weight of the expansion valve. Therefore, when the material is made of a material with relatively low rigidity (soft material) such as aluminum or an alloy thereof, the leg portion of the vibration-proof spring slides with the inner surface of the valve chamber. There is a concern that the wear may be reduced due to wear.

  Accordingly, an object of the present invention is to provide an expansion valve that can suppress the generation of noise due to vibration of a valve member while preventing wear of the valve body.

  To achieve the above object, an expansion valve according to the present invention includes a power element including an upper lid member, a receiving member, and a diaphragm sandwiched between the upper lid member and the receiving member, an inlet port, and a valve communicating with the inlet port. A valve body including a chamber, a valve hole communicating with the valve chamber, an outlet port communicating with the valve hole, a valve seat formed at an opening of the valve hole on the valve chamber side, and a power element mounting portion; A valve member disposed in contact with the seat; a support member that supports the valve member; a coil spring that is fixed in the valve chamber and biases the support member toward the valve hole; and is attached to the power element. And a vibration isolation spring fixed to the valve chamber and slidably in contact with the outer peripheral surface of the support member.

In one embodiment of the expansion valve according to the present invention, the vibration-proof spring includes a cylindrical main body portion and a plurality of sliding arms formed on the inner peripheral surface side of the main body portion. Alternatively, the anti-vibration spring includes an annular main body part and a plurality of sliding arms formed on the inner peripheral side of the main body part along the central axis direction.
At this time, the plurality of sliding arms may be arranged at positions facing each other with respect to the central axis of the main body, or the plurality of sliding arms are arranged at equal intervals in the circumferential direction of the main body. May be.

  According to the expansion valve of the present invention, it is possible to provide an expansion valve that can suppress the generation of noise due to vibration of the valve member without wearing the inside of the valve body.

It is a longitudinal cross-sectional view which shows the expansion valve by 1st Example of this invention. It is a disassembled perspective view which shows the detail of the valve structure used for the expansion valve shown in FIG. It is a perspective view which shows the vibration proof spring applied to the expansion valve by 1st Example of this invention. It is an expanded sectional view of the principal part which shows the attachment state of the valve hole of the expansion valve shown in FIG. 1, and a valve structure. It is a longitudinal cross-sectional view which shows the expansion valve by 2nd Example of this invention. It is a disassembled perspective view which shows the detail of the valve structure used for the expansion valve shown in FIG. It is a perspective view which shows the vibration-proof spring applied to the expansion valve by 2nd Example of this invention. It is an expanded sectional view of the principal part which shows the attachment state of the valve hole of the expansion valve shown in FIG. 5, and a valve structure. It is a longitudinal cross-sectional view which shows the expansion valve by 3rd Example of this invention. It is an expanded sectional view of the principal part which shows the attachment state of the valve hole of the expansion valve shown in FIG. 9, and a valve structure.

<First embodiment>
FIG. 1 is a longitudinal sectional view showing an expansion valve according to a first embodiment of the present invention.
As shown in FIG. 1, the expansion valve 10 according to the first embodiment of the present invention includes a valve body 11, a valve rod 60, a power element 70, and a valve structure 100.

The valve body 11 of the expansion valve 10 is made of, for example, an aluminum alloy, and can be formed by extruding an aluminum alloy or the like with the X direction shown in FIG.
The valve body 11 includes a power element mounting portion 12 formed on the upper surface portion and having an internal thread, an inlet port 20 into which a high-pressure refrigerant is introduced, a refrigerant outlet port 28, a refrigerant return passage 30, and the valve body 11. Has a female screw 80 for screwing a stud bolt (not shown) for attaching to the other parts, and a through groove or hole (both not shown) for inserting the bolt.

A female thread 11a that opens to the lower end is formed at the lower part of the valve body 11, and the valve chamber 24 is formed by sealing the female thread 11a with a plug 50 of the valve structure 100 described later. Further, the inlet port 20 communicates with the valve chamber 24 from the side through a small diameter hole 20a.
On the other hand, an outlet port 28 is formed above the valve chamber 24 in the valve body 11. The outlet port 28 communicates with the upper end portion of the valve chamber 24 through a valve hole (orifice) 26, and a valve seat 25 is formed on the valve hole 24 side of the valve hole 26.

A return passage 30 is formed further above the outlet port 28 in the valve body 11 so as to penetrate the valve body 11 in the X direction in FIG.
The refrigerant flows in from the inlet port 20, passes through the valve hole 26, expands, and then is sent from the outlet port 28 to an evaporator (not shown). The refrigerant that has passed through the evaporator passes through the valve body 11 so as to enter from the left side of the return passage 30 and escape to the right side (that is, in the direction of the arrow X), and returns to the compressor (not shown).

A power element attachment portion 12 for attaching a power element 70 described later is formed further above the return passage 30 in the valve body 11.
The power element attachment portion 12 is formed as a bottomed cylindrical hole having a circular opening on the upper surface of the valve body 11 at the upper end of the valve body 11 and having an internal thread on the inner wall surface thereof.
Further, a communication hole 31 reaching the return passage 30 is formed in the central portion of the power element mounting portion 12, and a later-described valve rod 60 is inserted therethrough.

The power element 70 is configured by including a diaphragm and a stopper member (both not shown) between the upper lid member 71 and the receiving member 72.
At this time, a pressure working chamber is formed between the upper lid member 71 and the diaphragm, and working gas is sealed in the pressure working chamber.

The lower portion of the receiving member 72 is cylindrical, and a male screw 72a is formed around it. The screw 72a is attached to the power element mounting portion 12 by being screwed with the female screw of the power element mounting portion 12 described above.
At this time, a packing 35 is interposed between the power element 70 and the valve body 11 to prevent leakage from the communication hole 31 when the power element 70 is attached to the valve body 11.

A through hole 29 is formed between the outlet port 28 and the return passage 30. And the valve hole 26, the through-hole 29, and the communication hole 31 are arrange | positioned so that a center may respectively be on the same straight line.
Further, a valve rod 60 is provided in such a manner as to be inserted into each of the valve hole 26, the through hole 29, and the communication hole 31.

The upper end side of the valve rod 60 is in contact with the stopper member of the power element 70, and the lower end side thereof is disposed so as to contact a valve member 40 of the valve structure 100 described later.
With such an arrangement, the expansion valve 10 shown in FIG. 1 moves the stopper member up and down in response to the movement of the diaphragm deformed according to the fluctuation of the internal pressure in the pressure working chamber of the power element 70, and the stopper member Is transferred to the valve member 40 of the valve structure 100 through the valve rod 60, and the expansion valve is opened and closed.

The plug 50 constituting a part of the valve structure 100 is a bottomed cylindrical member, and has a recess 52 formed on the upper surface side and a hexagonal hole 53 formed on the lower surface side.
Further, a male screw is formed on the lower outer peripheral surface of the plug 50 and is attached in a manner to be engaged with a female screw 11 a that opens at the lower end of the valve body 11.
At this time, a seal member 54 such as an O-ring is provided between the valve main body 11 and the plug 50, thereby sealing the valve chamber 24.

FIG. 2 is an exploded perspective view showing details of a valve structure used in the expansion valve shown in FIG.
As shown in FIG. 2, the valve structure 100 includes a ball-shaped valve member 40 that contacts the valve seat 25 of the valve body 11 to control the orifice opening area, a support member 42 that supports the valve member 40, and a support The coil spring 44 that supports the member 42, the plug 50 that receives the coil spring 44, and the vibration-proof spring 110 that slidably contacts the outer peripheral surface of the support member 42.

The support member 42 includes a disc portion 42 a having a conical recess for supporting the valve member 40, and a flange portion 42 b protruding to the side surface. The lower surface of the flange portion 42 b is the upper end of the coil spring 44. For example, it is made of stainless steel or an alloy thereof.
Further, the coil spring 44 is accommodated between the lower surface of the flange portion 42 b provided in the support member 42 and the recess 52 formed in the plug 50, whereby the valve member 40 is interposed via the support member 42. It is urged toward the side where the valve seat 25 is located, and is made of, for example, stainless steel or an alloy thereof, like the support member 42.
The spring force of the coil spring 44 can be adjusted by changing the screwing amount of the plug 50 to adjust the distance between the valve seat 25 and the bottom surface of the recess 52.

FIG. 3 is a perspective view showing an anti-vibration spring applied to the expansion valve according to the first embodiment of the present invention.
As shown in FIG. 3, the anti-vibration spring 110 applied to the first embodiment is in contact with the cylindrical main body 111, the notch 112 from which a part of the main body 111 is removed, and the notch 112. And a formed sliding arm 113.

The main body 111 is made of, for example, a plate made of stainless steel or an alloy thereof. As an example, the long and narrow strip-shaped member is curved into a cylindrical shape, and ends thereof are coupled to each other by a coupling unit 111a by an appropriate technique. Thus, it has a cylindrical shape (cylindrical shape, rectangular tube shape, etc.).
The sliding arm 113 has a longitudinal portion in the circumferential direction of the main body 111, and is formed such that one end thereof is connected to the main body 111 and the other end is a free end.

The sliding arm 113 is arranged so as to be bent from the base so that the tip thereof enters the inner peripheral surface side of the main body 111.
A protruding portion 114 having a shape imitating a part of a spherical surface is formed at the tip of the sliding arm 113 so as to be in sliding contact with the outer peripheral surface of the flange portion 42b of the support member 42 at a point or a small area. Yes.

As shown in FIG. 3, in the first embodiment, the sliding arms 113 of the anti-vibration spring 110 are formed at three locations so as to be substantially equidistant from each other in the circumferential direction of the main body 111.
Here, FIG. 3 illustrates the case where the notch portion 112 and the sliding arm 113 are arranged at three locations, but the vibration-proof spring 110 is in sliding contact with the flange portion 42b of the support member 42 so as to be sandwiched from the outer peripheral surface side. Therefore, it is sufficient that at least two sliding arms 113 are formed.

When an even number of sliding arms 113 are formed, the sliding arms 113 may not be equally spaced in the circumferential direction of the main body 111, but the pair of sliding arms 113 is related to the central axis of the main body 111. It is preferable to arrange in the position which opposes.
Further, even when an odd number of sliding arms 113 are formed, for example, if they are arranged so as to be line-symmetric with respect to a straight line passing through the central axis of the main body 111, they are arranged at equal intervals particularly in the circumferential direction. There is no need to

When manufacturing the anti-vibration spring 110 shown in FIG. 3, for example, a sliding arm 113 is formed by providing a predetermined number of notches 112 by punching with a press on a strip-shaped member constituting the main body 111. Then, this is bent into a cylindrical shape, and the ends are joined by caulking or the like, thereby forming the coupling portion 111a.
Thereafter, the vibration-proof spring 110 is formed by deforming the sliding arm 113 toward the inner peripheral surface of the main body 111.
Further, at the time of the punching process, the protruding part 114 may be simultaneously formed on the tip of the sliding arm 113 so as to protrude in a direction positioned in advance on the inner peripheral surface side of the main body part 111.

FIG. 4 is an enlarged cross-sectional view of a main part showing a mounting state between the valve hole of the expansion valve and the valve structure 100 shown in FIG. 4 is a cross-sectional view taken along two imaginary planes including the central axis of the anti-vibration spring 110 shown in FIG. 3 and passing through the central axis and the two protrusions 114. FIG.
As shown in FIG. 4, an anti-vibration spring 110 forming a part of the valve structure 100 is attached to the inner peripheral surface 24 a in the vicinity of the valve seat 25 of the valve chamber 24 formed in the valve body 11 by press-fitting or insertion. After that, the open end portion of the inner peripheral surface 24a is caulked (the caulking portion is denoted by reference numeral 24b) to be fixed. Of course, instead of caulking, a technique such as adhesion or welding may be employed.

On the other hand, the support member 42 supported by the upper end of the coil spring 44 is inserted inside the vibration-proof spring 110 in a state where the valve member 40 is supported by the disc portion 42a. It arrange | positions so that it may contact | abut a lower end.
At this time, the protruding portion 114 formed on the sliding arm 113 of the vibration-proof spring 110 is in a state of being substantially point-contacted with the outer peripheral surface of the flange portion 42b of the support member 42.
Accordingly, the support member 42 can be prevented from vibrating in the horizontal direction (X direction) in the drawing, and the support member 42 can slide in the vertical direction (Y direction) in the drawing according to the expansion and contraction of the coil spring 44. Since it is in sliding contact with 113, it is possible to suppress the support member 42 from vibrating in the vertical direction.

With the above-described configuration, according to the expansion valve of the first embodiment of the present invention, the outer peripheral surface of the support member in which the sliding arm of the vibration-proof spring attached to the inner peripheral surface of the valve chamber supports the valve member. By being in sliding contact with the valve chamber, there is no influence of direct sliding on the valve chamber of the valve body formed of a soft material, so that the valve chamber is not worn.
Further, the vibration-proof spring is in sliding contact with the outer peripheral surface of the support member, thereby suppressing the vibration of the support member in the lateral direction and also suppressing the vibration of the support member in the vertical direction accompanying the vertical movement of the support member by the coil spring. Therefore, the generation of noise due to the vibration of the valve member can also be suppressed.

Since the vibration-proof spring and the support member are in sliding contact with each other, the material constituting the support member is preferably the same material as the metal constituting the vibration-proof spring or a harder material, but at least the valve body is formed. Any material that is harder than the material to be used may be used.
Further, the vibration-proof spring applied to the first embodiment can perform the above-described vibration suppression function if it is in sliding contact with the outer peripheral surface of the support member at any position in the height direction. When attaching the spring to the valve chamber, it does not matter the vertical direction.
Furthermore, the main body part 111 of the vibration-proof spring 110 is formed by bending an elongated strip-like member into a cylindrical shape and joining the end parts by an appropriate technique, but without joining the end parts, Of course, it may be fixed to the inner peripheral surface 24a of the valve body 11 in a state of being curved in a cylindrical shape.

<Second embodiment>
FIG. 5 is a longitudinal sectional view showing an expansion valve according to a second embodiment of the present invention.
In the second embodiment, among the constituent elements of the expansion valve 10, those having the same functions and arrangement as those shown in the first embodiment (FIG. 1) are denoted by the same reference numerals. Further, re-explanation will be omitted for parts other than the main part of the invention.
As shown in FIG. 5, the expansion valve 10 according to the second embodiment of the present invention includes a valve body 11, a valve rod 60, a power element 70, and a valve structure 200.

6 is an exploded perspective view showing details of the valve structure used in the expansion valve shown in FIG.
As shown in FIG. 6, the valve structure 200 supports a ball-shaped valve member 40 that opens and closes in contact with the valve seat 25 of the valve body 11, a support member 42 that supports the valve member 40, and the support member 42. Coil spring 44, plug 50 that receives coil spring 44, and anti-vibration spring 210 that slidably contacts the outer peripheral surface of support member 42.

FIG. 7 is a perspective view showing an anti-vibration spring applied to the expansion valve according to the second embodiment of the present invention.
As shown in FIG. 7, the anti-vibration spring 210 applied to the second embodiment includes an annular main body 211 and a sliding arm 212 extending so as to stand on the inner peripheral surface side of the main body 211. Composed.

As in the first embodiment, the main body 211 is formed of a metal plate such as stainless steel, for example, and the sliding arm 212 has a longitudinal direction in the radial direction of the main body 211, and its tip is a free end. Formed to be.
The sliding arm 212 is bent from the base so that the tip thereof is directed in the height direction of the main body 211, and the tip is slidably contacted with the outer peripheral surface of the flange portion 42 b of the support member 42 at a point or a small area. Thus, the protrusion part 213 which has the shape imitating a part of spherical surface is formed.

As shown in FIG. 7, in the second embodiment, the sliding arms 212 of the anti-vibration spring 210 are formed at three locations so as to be equidistant from each other in the circumferential direction of the main body 211.
Here, FIG. 7 illustrates the case where the sliding arms 212 are arranged at three locations. However, as in the case of the first embodiment, the anti-vibration spring 210 is placed on the flange portion 42b of the support member 42 on the outer peripheral surface side. At least two or more sliding arms 212 may be formed so as to be in sliding contact with each other.

When an even number of sliding arms 212 are formed, the sliding arms 212 may not be equally spaced in the circumferential direction of the main body 211, but the pair of sliding arms 212 is related to the central axis of the main body 211. It is preferable to arrange in the position which opposes.
Also, when an odd number of sliding arms 212 are formed, for example, if they are arranged so as to be a line object with respect to a straight line passing through the center of the main body 211, they are arranged at equal intervals, particularly in the circumferential direction. There is no need.

When manufacturing the anti-vibration spring 210 shown in FIG. 7, the plate-shaped member which comprises the main-body part 211 can be shape | molded by the punching process by a press, for example. At this time, a predetermined number of sliding arms 212 may be simultaneously formed on the inner peripheral surface side of the main body 211 by punching.
Thereafter, the anti-vibration spring 210 is formed by bending the sliding arm 212 in the height direction with respect to the main body 211 and deforming it.
Further, at the time of the punching process, the projecting part 213 may be simultaneously molded at the tip of the sliding arm 212 so as to project in advance in a direction positioned on the inner peripheral surface side of the main body part 211.

FIG. 8 is an enlarged cross-sectional view of a main part showing an attachment state of the valve hole and the valve structure of the expansion valve shown in FIG. FIG. 8 is a cross-sectional view taken along two virtual planes including the central axis of the anti-vibration spring 210 shown in FIG. 7 and passing through the central axis and the two protruding portions 213.
As shown in FIG. 8, in the second embodiment, a step portion 24c having a slightly reduced diameter is formed in the vicinity of the valve seat 25 of the valve chamber 24, and the step portion 24c forms a part of the valve structure 200. The oscillating spring 210 is fitted and caulked (the caulking portion is denoted by reference numeral 24d) to be fixed. Of course, instead of caulking, a technique such as adhesion or welding may be employed.

On the other hand, the support member 42 supported by the upper end of the coil spring 44 is inserted inside the vibration-proof spring 210 in a state where the valve member 40 is supported by the disc portion 42a. It arrange | positions so that it may contact | abut a lower end.
At this time, the protruding portion 213 formed on the sliding arm 212 of the anti-vibration spring 210 is substantially in point contact with the outer peripheral surface of the flange portion 42 b of the support member 42.

Accordingly, the support member 42 can be prevented from vibrating in the horizontal direction (X direction) in the drawing, and the support member 42 can slide in the vertical direction (Y direction) in the drawing according to the expansion and contraction of the coil spring 44. Since it is in sliding contact with 212, it is possible to suppress the support member 42 from vibrating in the vertical direction.
As in the case of the first embodiment, since the vibration-proof spring and the support member are in sliding contact, the material constituting the support member is the same material as the metal constituting the vibration-proof spring or a harder material. Although it is preferable from the viewpoint of reducing the wear of the expansion valve (that is, reducing the wear of the support member), any material that is harder than the material forming the valve body may be used.

By providing the configuration shown above, according to the expansion valve of the second embodiment of the present invention, the sliding arm of the vibration-proof spring attached to the inner peripheral surface of the valve chamber has the outer periphery of the support member that supports the valve member. By having the function of slidingly contacting the surface and guiding the sliding movement of the support member, it is possible to suppress the wear of the valve body and to suppress the generation of noise, similarly to the expansion valve of the first embodiment.
In addition to the above effects, according to the expansion valve of the second embodiment, the sliding arm extends in the height direction of the anti-vibration spring, so that the material required for processing the anti-vibration spring is reduced and supported. The minimum necessary sliding contact with the outer peripheral surface of the member can be made possible.

<Third embodiment>
FIG. 9 is a longitudinal sectional view showing an expansion valve according to a third embodiment of the present invention.
Also in the third embodiment, among the constituent elements of the expansion valve 10, those having the same functions and arrangement as those shown in the first embodiment (FIG. 1) are denoted by the same reference numerals. . Further, re-explanation will be omitted for parts other than the main part of the invention.
As shown in FIG. 9, the expansion valve 10 according to the second embodiment of the present invention includes a valve body 11, a valve rod 60, a power element 70, and a valve structure 300.

In the expansion valve 10 according to the third embodiment of the present invention, the valve structure 300 includes a ball-shaped valve member 40 that opens and closes in contact with the valve seat 25 of the valve body 11, and a support member 310 that supports the valve member 40. The coil spring 44 that supports the support member 42, the plug 50 that receives the coil spring 44, and the vibration-proof spring 110 that slidably contacts the outer peripheral surface of the support member 42.
As shown in FIG. 9, the expansion valve 10 according to the third embodiment is the same as the anti-vibration spring 110 used in the first embodiment, and therefore the description of the structure and the like is omitted. To do.

The support member 310 includes a disc portion 310a having a conical recess for supporting the valve member 40 at a central portion thereof, and a side wall portion 310b standing upright from an outer peripheral portion, and is formed of stainless steel or the like. Yes.
When manufacturing such a support member 310, for example, a disk-shaped member is pressed to form the conical recess of the disk part 310a and the side wall part 310b at the same time.

FIG. 10 is an enlarged cross-sectional view of a main part showing a state where the valve hole and the valve structure of the expansion valve shown in FIG. 9 are attached.
As shown in FIG. 10, in the third embodiment, the inner peripheral surface 24a in the vicinity of the valve seat 25 of the valve chamber 24 is slightly larger in diameter than the lower portion thereof, and the vibration isolating spring 110 is added to this enlarged diameter portion. Are fixed by fitting. This fitting structure eliminates the need for a caulking fixing structure for the vibration-proof spring as in the first embodiment.

On the other hand, the support member 310 supported on the upper end of the coil spring 44 is mounted on the coil spring 44 in such a manner that the side wall portion 310b surrounds the upper end of the coil spring 44 and inserted into the anti-vibration spring 110. It has become.
At this time, the projecting portion 114 formed on the sliding arm 113 of the vibration-proof spring 110 is in sliding contact with the outer peripheral surface of the side wall portion 310b of the support member 310 in the form of point contact.

Accordingly, the support member 310 can be prevented from vibrating in the lateral direction in the drawing, and the support member 310 is in sliding contact with the sliding arm 113 in the vertical direction in the drawing according to the expansion and contraction of the coil spring 44. The vibration of 310 in the vertical direction can also be suppressed.
As in the case of the first embodiment, since the vibration-proof spring and the support member are in sliding contact, the material constituting the support member is the same material as the metal constituting the vibration-proof spring or a harder material. It is preferable that the material is at least harder than the material forming the valve body.

By providing the above-described configuration, according to the expansion valve of the third embodiment of the present invention, the sliding arm of the vibration-proof spring attached to the inner peripheral surface of the valve chamber has the outer periphery of the support member that supports the valve member. By having the function of slidingly contacting the surface and guiding the sliding movement of the support member, it is possible to suppress the wear of the valve body and to suppress the generation of noise, similarly to the expansion valve of the first embodiment.
In addition to the above effects, according to the expansion valve of the third embodiment, the structure of the support member that supports the valve member is simplified, so that the manufacture thereof is facilitated.
Furthermore, since the side wall portion of the support member is located outside the coil spring, the sliding position with the anti-vibration spring is closer to the inner peripheral surface of the valve chamber, thereby improving the stability of the support member against vertical movement. To do.

As described above, the expansion valve according to the present invention has been described based on typical examples thereof, but the present invention is not limited to the above specific examples, and various modifications can be made.
For example, in the first to third embodiments, as the material constituting the support member, the same material as the vibration-proof spring or a harder material is exemplified, but a wear-resistant material such as a ceramic material is applied, Alternatively, a wear-resistant coating may be applied to the sliding surface.
Further, the valve member and the support member may be formed as separate bodies, but may be formed as an integrated object.

Furthermore, in the first to third embodiments, the case where the power element is attached to the upper end of the valve main body by screwing is illustrated, but besides this, a cylindrical portion is formed on the upper portion of the valve main body, You may use the structure which attaches a power element by carrying out the inside caulking process of this cylindrical part in the state which inserted the power element inside.
In addition, various modifications can be made to the above-described embodiment without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Expansion valve 11 Valve main body 12 Power element attaching part 20 Inlet port 24 Valve chamber 24a (Inner valve | bulb) inner peripheral surface 24b Caulking part 24c (Valve room) Step part 24d Caulking part 25 Valve seat 26 Valve hole 28 Outlet port 29 Through hole 30 Return passage 31 Communication hole 40 Valve member 42 Support member 42a Disk portion 42b Flange portion 44 Coil spring 50 Plug 54 Seal member 60 Valve rod 70 Power element 71 Upper lid member 72 Receiving member 100, 200, 300 Valve structure 110 , 210 Anti-vibration springs 111, 211 Main body part 112 Notch part 113, 212 Sliding arm 114, 213 Projection part 310 Support member 310a Disk part 310b Side wall part

Claims (5)

A power element including an upper lid member, a receiving member, and a diaphragm sandwiched between the upper lid member and the receiving member;
Inlet port, valve chamber communicating with the inlet port, valve hole communicating with the valve chamber, outlet port communicating with the valve hole, valve seat formed at the valve chamber side opening of the valve hole, and power element A valve body including a mounting portion;
A valve member disposed in contact with the valve seat;
A support member for supporting the valve member;
A coil spring provided in the valve chamber and biasing the support member toward the valve hole;
A valve stem attached to the power element to drive the valve member;
An anti-vibration spring fixed in the valve chamber and slidably contacting the outer peripheral surface of the support member;
An expansion valve comprising: The expansion valve according to claim 1, wherein the vibration-proof spring includes a cylindrical main body portion and a plurality of sliding arms formed on an inner peripheral surface side of the main body portion. The said vibration-proof spring has an annular main body part and a plurality of sliding arms formed along the central axis direction on the inner peripheral side of the main body part. Expansion valve. The expansion valve according to claim 2 or 3, wherein the plurality of sliding arms are arranged at positions facing each other with respect to a central axis of the main body. The expansion valve according to claim 2 or 3, wherein the plurality of sliding arms are arranged at equal intervals in a circumferential direction of the main body.

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