JP2012225646A - Pressure control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure control valve, which has a simple structure, has a low production cost, and can facilitate the adjustment of the degree of opening a valve.SOLUTION: The pressure control valve 21 includes: a valve body 22 having a valve chamber 22a in the main valve body; a valve seat 23 disposed in the valve chamber; and a valve body 24 detachable and attachable for the valve seat, the valve body is provided with a cylindrical part, the valve seat is made of a thin plate and is provided with a cylindrical part which surrounds the circumferential surface of the cylindrical part, while the circumferential surface of the cylindrical part of the valve body and a thin-plate-like cylindrical part are brought into contact with each other, two spaces are divisionally formed in the valve chamber, communication of the spaces is intercepted to get to a closed state and, when a pressure of a fluid in one side space of the two spaces exceeds the prescribed value, the valve seat is elastically deformed and the valve body and the valve seat are separated from each other to get to an open state. The valve seat is constituted with an elastomer and the valve can be opened and closed by utilizing a deformation of the elastomer, therefore, the structure is simple and the production cost can be suppressed low. By changing dimensions and material of the elastomer, the adjustment of operating pressure and the degree of opening the valve can be simply adjusted.

Description

  The present invention relates to a pressure control valve, and more particularly to a pressure control valve used for a refrigeration cycle used for refrigeration and air conditioning.

  Conventionally, in the refrigeration cycle and the like, a pressure control valve is used to control the pressure of a refrigerant or the like. For example, a vapor compression refrigeration cycle that circulates a refrigerant in a sealed circuit constituted by a compressor, a radiator, a pressure control valve (expansion valve), an evaporator, and the like is used for a vehicle air conditioner and the like.

  As an example of a pressure control valve used in the vapor compression refrigeration cycle, Patent Document 1 discloses a body having a refrigerant flow path from an internal heat exchanger to an evaporator via a valve port, A valve seat that is provided, a valve body that is housed in the body and contacts and separates from the valve seat, a diaphragm that is fixed to one end of the valve body, a lid that forms a sealed space above the diaphragm, and a lower support portion; A pressure control valve including a spring mounting portion provided at the other end of the valve body and a spring interposed between the spring mounting portion and the valve seat is described.

  In the pressure control valve having the above configuration, the valve closing force of the valve body is between the internal pressure in the sealed space formed above the diaphragm fixed to one end of the valve body and the spring mounting portion of the valve seat and the valve body. The valve opening force of the valve body is obtained by the pressure of the refrigerant from the internal heat exchanger. The valve closing / opening state is switched according to the balance between the valve closing force and the valve opening force.

JP 2007-139209 A

  However, in the pressure control valve described in Patent Document 1, the valve closing force for the valve body is obtained from two of the internal pressure of the sealed space and the spring interposed between the valve seat and the spring mounting portion of the valve body. The structure is complicated and the manufacturing cost is high.

  There is also a pressure control valve that obtains the valve closing force for the valve body only by a coil spring that urges the valve body in the valve seat direction. However, such a pressure control valve also requires a coil spring and its mounting structure. Thus, there was room for improvement in terms of the valve structure and manufacturing cost.

  Accordingly, the present invention has been made in view of the above-described problems in the prior art, and provides a pressure control valve that is simple in structure, low in manufacturing cost, and can easily adjust the valve opening. For the purpose.

  In order to achieve the above object, the present invention is a pressure control valve, comprising a valve body having a valve chamber therein, a valve seat provided in the valve chamber, and a valve body contacting and separating from the valve seat. The valve body includes a columnar portion, the valve seat is formed of a thin plate, and includes a cylindrical portion surrounding the circumferential surface of the columnar portion, and the circumferential surface of the columnar portion of the valve body and the In a state in which the thin cylindrical portion is in contact with each other, two spaces are defined in the valve chamber, and communication between these spaces is blocked and closed, and one of the two spaces is closed. When the pressure of the fluid in the space exceeds a predetermined value, the valve seat is elastically deformed, and the valve body and the valve seat are separated from each other to be in an open state.

  And according to this invention, since a valve seat can be comprised with an elastic body and a valve can be opened and closed using a deformation | transformation of an elastic body, a structure is simple and manufacturing cost can be held down low. In addition, the operating pressure and the valve opening can be easily adjusted by changing the dimensions and material of the elastic body.

  Further, the present invention is a pressure control valve, comprising: a valve body having a valve chamber therein; a valve seat provided in the valve chamber; and a valve body contacting and separating from the valve seat, A solid cylindrical body made of an elastic body, wherein the valve seat is an inner peripheral surface of the valve chamber surrounding the solid cylindrical body, the outer peripheral surface of the solid cylindrical body and the valve chamber Two spaces are defined in the valve chamber in a state in which the inner peripheral surfaces are in contact with each other, and communication between these spaces is blocked and a closed state is established, and one of the two spaces is closed. When the pressure of the fluid inside exceeds a predetermined value, the valve body is elastically deformed, and the valve body and the valve seat are separated from each other to be in an open state.

  And according to this invention, since a valve body is comprised with an elastic body and a valve can be opened and closed using a deformation | transformation of an elastic body, a structure is simple and manufacturing cost can be held down low. In addition, the operating pressure and the valve opening can be easily adjusted by changing the dimensions and material of the elastic body.

  As described above, according to the present invention, it is possible to provide a pressure control valve that is simple in structure, low in manufacturing cost, and that can easily adjust the valve opening.

It is sectional drawing which shows 1st Embodiment of the pressure control valve concerning this invention. It is sectional drawing which shows 2nd Embodiment of the pressure control valve concerning this invention.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of a pressure control valve according to the present invention. This pressure control valve 21 is roughly divided into a valve main body 22 having a valve chamber 22a therein, and a valve seat 23 in the valve chamber 22a. It consists of the valve body 24 etc. which contact / separate to.

  The valve body 22 is formed of metal, synthetic resin, or the like, and includes a valve chamber 22a as a cylindrical space inside, and a valve seat 23 and a valve body 24 are accommodated in the valve chamber 22a. A housing 25 having a flow path 25a is integrated on the left side of the valve body 22, and a housing 26 having a flow path 26a is integrated on the right side. A plurality of through holes 22 b are formed as flow paths at the left end of the valve body 22.

  The valve seat 23 is formed in a cylindrical shape with a thin plate of metal or the like, and is fixed to the valve body 22. An O-ring 27 is interposed between the right end portion of the valve seat 23 and the valve main body 22, and the left end portion of the valve seat 23 abuts on the protruding portion 22 c of the valve main body 22. A cylindrical gap 29 is formed between the outer peripheral surface of the valve seat 23 and the inner peripheral surface of the valve main body 22, and the gap 29 communicates with the flow path 25a through the through hole 22b.

  The valve body 24 is generally formed in a substantially cylindrical shape from metal, synthetic resin, or the like, and is in contact with the inner peripheral surface of the valve seat 23 at the large-diameter portion 24a on the right side. The portion excluding the large diameter portion 24a of the valve body 24 is formed in a cylindrical shape having the same diameter, but is not a complete cylinder, and a plurality of cutout portions 24b are formed, and the cutout portions 24b communicate with the valve chamber 22a. .

  The housing 25 is made of metal, synthetic resin, or the like, and a cylindrical space having a large diameter and a small diameter is formed as a flow path 25a therein. The large-diameter-side flow path 25a is a space continuous with the valve chamber 22a and communicates with the gap 29 through the through hole 22b.

  The housing 26 is formed of metal, synthetic resin, or the like, and a cylindrical and frustoconical space is formed therein as a flow path 26a. The flow path 26a constitutes a space continuous with the valve chamber 22a.

  Next, the operation of the pressure control valve 21 having the above configuration will be described with reference to FIG.

  FIG. 1A shows a state in which the pressure control valve 21 is closed. In this state, the large diameter portion 24a of the valve body 24 is in contact with the inner peripheral surface of the valve seat 23, so that the flow from the flow path 25a. The fluid does not flow in any direction from the channel 26a and the channel 26a to the channel 25a.

  When the pressure of the fluid on the flow path 26a side rises from the state of FIG. 1 (a) and exceeds a predetermined value, the valve seat 23 is elastically deformed outward and expanded as shown in FIG. 1 (b). A gap is formed between the inner peripheral surface of the valve seat 23 and the large diameter portion 24 a of the valve body 24. Through this gap, the fluid flows to the left, through the notch 24b of the valve body 24, toward the flow path 25a, and the pressure control valve 21 is opened. In FIG. 1 (b), in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 21 are omitted, and only the cross section is shown.

  On the other hand, when the pressure of the fluid on the flow path 25a increases from the state of FIG. 1A, the fluid pressure in the notch 24b of the valve body 24 and the like increases through the flow path 25a, but the flow path 25a Is communicated with the gap 29 through the through-hole 22b, the fluid pressure in the gap 29 is also increased, and the inner circumferential surface of the valve seat 23 is pressed toward the valve body 24 by this fluid pressure. Therefore, the inner peripheral surface of the valve seat 23 and the large diameter portion 24a of the valve body 24 are not separated. Therefore, the closed state of the pressure control valve 21 is maintained.

  As described above, as shown in FIG. 1B, the pressure control valve 21 opens when the pressure of the fluid on the flow path 26a side exceeds a predetermined value, and as shown in FIG. Since the fluid does not flow from the flow path 25a to the flow path 26a and the closed state can be maintained, it also functions as a check valve. In FIG. 1C, in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 21 are omitted, and only a cross section is shown.

  Next, a second embodiment of the pressure control valve according to the present invention will be described with reference to FIG.

  The pressure control valve 81 is roughly divided into a valve body 83 having a valve chamber 82a therein, and a valve body 83 that contacts and separates from an inner peripheral surface 82b (hereinafter referred to as “valve seat”) of the valve body 82 that functions as a valve seat. Etc.

  The valve body 82 is formed of metal, synthetic resin, or the like, and includes a valve chamber 82a as a cylindrical space inside, and the valve body 83 is accommodated in the valve chamber 82a. A housing 85 having a flow path 85a is integrated on the left side of the valve body 83, and a housing 86 having a flow path 86a is integrated on the right side.

  The valve body 83 is a solid elastic body made of a synthetic resin such as rubber, and is formed in a cylindrical shape whose outer diameter gradually decreases from the left to the right, and the right end 83a is a valve body. It is fixed to a support member 87 fixed to the inner peripheral surface of 82. Although the support member 87 is formed in a disc shape, a plurality of through holes (not shown) are formed in the support member 87, so that the left and right sides of the valve chamber 82a partitioned by the support member 87 are in communication. On the other hand, the left end portion 83b has a larger diameter than the other portions and includes a recess 83c. The outer peripheral surface of the left end portion 83b is in contact with the valve seat 82b.

  The housing 85 is formed of metal, synthetic resin, or the like, and a cylindrical space is formed inside as a flow path 85a. The housing 86 is also formed of synthetic resin or the like, and a cylindrical space is formed as a flow path 86a inside.

  Next, the operation of the pressure control valve 81 having the above configuration will be described with reference to FIG.

  FIG. 2A shows a state in which the pressure control valve 81 is closed. In this state, the left end portion 83b of the valve body 83 is in contact with the inner peripheral surface of the valve seat 82b. The fluid does not flow in any direction from 86a and the flow path 86a to the flow path 85a.

  When the pressure of the fluid on the flow path 86a rises from the state of FIG. 2A and exceeds a predetermined value, the left end 83b is elasticized by the fluid pressure in the valve chamber 82a as shown in FIG. 2B. The diameter is reduced by the deformation, and a gap is formed between the valve seat 82b. The fluid flows through the gap to the left toward the flow path 85a, and the pressure control valve 81 is opened. In FIG. 2 (b), in order to make the drawing easier to see, stepped portions and contour lines of each component of the pressure control valve 81 are omitted, and only a cross section is shown.

  On the other hand, when the pressure of the fluid on the flow path 85a side increases from the state of FIG. 2A, the fluid pressure in the recess 83c of the valve body 83 also increases via the flow path 85a. The portion 83b is pressed toward the valve seat 82b, and the left end portion 83b and the valve seat 82b are not separated from each other. Therefore, the closed state of the pressure control valve 81 is maintained.

  As described above, the pressure control valve 81 opens when the pressure of the fluid on the flow path 86a side exceeds a predetermined value as shown in FIG. 2B, and as shown in FIG. Since the fluid does not flow from the flow path 85a to the flow path 86a and the closed state can be maintained, it also functions as a check valve. In FIG. 2C, in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 81 are omitted, and only the cross section is shown.

21 Pressure control valve 22 Valve body 22a Valve chamber 22b Through hole 22c Projecting portion 23 Valve seat 24 Valve body 24a Large diameter portion 24b Notch portion 25 Housing 25a Channel 26 Housing 26a Channel 27 O-ring 29 Clearance 81 Pressure control valve 82 Valve body 82a Valve chamber 82b Inner peripheral surface (valve seat)
83 Valve body 83a Right end part 83b Left end part 83c Recessed part 83d Stopper 85 Housing 85a Flow path 86 Housing 86a Flow path 87 Support member 87a Insertion hole

Claims (2)

  A valve body having a valve chamber therein; a valve seat provided in the valve chamber; and a valve body contacting and separating from the valve seat, the valve body including a cylindrical portion, and the valve seat is a thin plate A cylindrical portion surrounding the circumferential surface of the columnar portion, and the circumferential surface of the columnar portion of the valve body and the thin cylindrical portion are in contact with each other in the valve chamber. When the two spaces are partitioned and the communication between these spaces is blocked and closed, and the pressure of the fluid in one of the two spaces exceeds a predetermined value, the valve seat A pressure control valve, which is elastically deformed and wherein the valve body and the valve seat are separated from each other to be in an open state.   A valve body having a valve chamber therein, a valve seat provided in the valve chamber, and a valve body that contacts and separates from the valve seat, the valve body is a solid cylindrical body made of an elastic body, The valve seat is an inner peripheral surface of the valve chamber surrounding the solid cylindrical body, and the outer peripheral surface of the solid cylindrical body and the inner peripheral surface of the valve chamber are in contact with each other, When two spaces are defined in the valve chamber, the communication between these spaces is blocked and closed, and when the pressure of the fluid in one of the two spaces exceeds a predetermined value, The pressure control valve, wherein the valve body is elastically deformed, and the valve body and the valve seat are separated from each other to be in an open state.

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