CN113677919B - Flow control valve and method of assembling the same - Google Patents
Flow control valve and method of assembling the same Download PDFInfo
- Publication number
- CN113677919B CN113677919B CN202080008945.1A CN202080008945A CN113677919B CN 113677919 B CN113677919 B CN 113677919B CN 202080008945 A CN202080008945 A CN 202080008945A CN 113677919 B CN113677919 B CN 113677919B
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- Prior art keywords
- valve
- base member
- outer tube
- drive shaft
- flow control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Lift Valve (AREA)
- Valve Housings (AREA)
Abstract
Provided are a flow control valve and an assembly method thereof, which can effectively reduce differential pressure applied to a valve element in a moving direction without restricting the shape of the valve element. In the flow control valve (1), a lower end (20 a) of an outer tube member (20) is closed by a base member (10), and an upper end (20 b) of the outer tube member (20) is closed by a holder body (71), and a back pressure chamber (23) partitioned from a valve chamber (13) is formed. A drive shaft (64) is disposed across the valve chamber (13) and the back pressure chamber (23). The base member (10) is provided with a flow path (16) connected to the valve port (15) and a pressure equalizing hole (17) connecting the flow path (16) to the back pressure chamber (23).
Description
Technical Field
The present invention relates to a flow rate control valve incorporated in, for example, a refrigeration cycle or the like for controlling the flow rate of a fluid such as a refrigerant, and a method of assembling the same.
Background
Patent document 1 discloses a conventional pressure-balanced flow control valve. The flow control valve of patent document 1 includes a cylindrical guide portion provided in a valve housing, and a valve body slidably provided in the guide portion. The valve body opens and closes the valve port by the actuator moving in the axial direction (i.e., the moving direction) of the guide portion. The valve element is provided with a pressure equalizing passage connecting the valve port and the back pressure chamber, and thereby pressure balance between the fluid pressure of the valve port and the fluid pressure of the back pressure chamber is obtained. This reduces the difference (differential pressure) between the fluid pressure applied to the valve element from the valve port side and the fluid pressure applied to the valve element from the back pressure chamber side.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication 2016-211600
However, in the flow control valve of patent document 1, since the vertical hole penetrating the valve body is provided as a pressure equalizing passage, the tip end of the valve body cannot be formed in a sharp shape. Therefore, the shape of the valve element is restricted. Thus, it is difficult to realize, for example, a flow rate characteristic of equal percentage, and the flow rate characteristic is also restricted.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a flow rate control valve and an assembling method thereof, which can effectively reduce a differential pressure applied to a valve body in a moving direction without restricting the shape of the valve body.
In order to achieve the above object, a flow control valve according to one embodiment of the present invention includes: a base member provided with a valve chamber and a valve port opening to the valve chamber; an outer tube member disposed outside the base member; a valve element disposed opposite to the valve port and opening/closing the valve port; a drive shaft, the valve core being provided at a distal end portion of the drive shaft; and a support member that supports the drive shaft so as to be movable in a direction in which the valve port and the valve body face each other, wherein one end of the outer tube member is closed by the base member, and the other end of the outer tube member is closed by the support member, thereby forming a back pressure chamber partitioned from the valve chamber, wherein the valve body or the drive shaft is disposed across the valve chamber and the back pressure chamber, and wherein the base member is provided with a flow path connected to the valve port and a pressure equalizing hole connecting the flow path to the back pressure chamber.
According to the present invention, one end of the outer tube member is closed by the base member, and the other end of the outer tube member is closed by the support member, and a back pressure chamber is formed so as to be partitioned from the valve chamber. The valve body or the drive shaft is disposed across the valve chamber and the back pressure chamber. The base member is provided with a flow path connected to the valve port and a pressure equalizing hole connecting the flow path to the back pressure chamber. Thus, the pressure equalizing hole provided in the base member can reduce the difference between the fluid pressure applied to the valve body from the valve port side and the fluid pressure applied to the valve body from the back pressure chamber side in the closed state in which the valve port is closed by the valve body. Therefore, the differential pressure applied to the valve element in the moving direction can be effectively reduced without restricting the shape of the valve element.
In the present invention, it is preferable that the flow rate control valve has a sealing member formed in a ring shape through which the valve body or the drive shaft passes, and seals between the valve chamber and the back pressure chamber, and a sealing portion sealed by the sealing member has the same diameter as the valve port. In this way, in the valve-closed state, the difference between the fluid pressure applied to the valve element from the valve port side and the fluid pressure applied to the valve element from the back pressure chamber side can be made zero (including substantially zero). Therefore, the differential pressure applied to the valve element in the moving direction can be reduced more effectively without restricting the shape of the valve element.
In the present invention, it is preferable that one of the base member and the support member is provided with a projection, and the other of the base member and the support member is provided with a hole into which the projection is inserted to restrict movement of the projection in a direction orthogonal to the opposing direction. For example, when the base member and the support member are assembled via the outer tube member, axial misalignment of the valve port and the valve element may occur due to dimensional tolerances and assembly accuracy of the base member and the outer tube member, and the support member and the outer tube member, respectively. In contrast, by providing the positioning protrusion on one of the base member and the support member and providing the positioning hole on the other of the base member and the support member, the base member and the support member are directly assembled, and thus axial displacement of the valve port and the valve element can be effectively suppressed.
In the present invention, it is preferable that the base member has a circular hole as the hole and is disposed coaxially with the valve port, and the support member has a cylindrical portion as the protrusion and is disposed coaxially with the drive shaft. This can effectively suppress axial displacement between the valve port and the valve body with a relatively simple structure.
In the present invention, it is preferable that the cylindrical portion is pressed into the circular hole. This makes it possible to more reliably assemble the base member and the support member.
In the present invention, it is preferable that the cylindrical portion has a press-fit end portion press-fitted into the circular hole and a main body portion connected to the press-fit end portion and having a diameter larger than that of the press-fit end portion, and a step portion between the press-fit end portion and the main body portion is in contact with the base member. Thus, the press-fit end portion can be press-fitted into the circular hole until the stepped portion between the press-fit end portion of the cylindrical portion and the main body portion comes into contact with the base member. Therefore, when a plurality of flow rate control valves are assembled, the amount of press-fitting (the size of the pressed portion) into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
In the present invention, it is preferable that the cylindrical portion has a press-fit end portion press-fitted into the circular hole and a main body portion connected to the press-fit end portion, and a protruding portion protruding radially outward from the press-fit end portion is provided at an end portion of the main body portion on the press-fit end portion side, the protruding portion being in contact with the base member. This allows the press-fit end to be press-fitted into the circular hole until the protruding portion of the cylindrical portion comes into contact with the base member. Therefore, when a plurality of flow control valves are assembled, the amount of press-fitting into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
In the present invention, it is preferable that the support member has a fitting portion fitted to an inner side of the outer tube member, and an outer peripheral surface of the fitting portion is formed to be in contact with an inner peripheral surface of the outer tube member. Thus, when the cylindrical portion of the support member is press-fitted into the circular hole of the base member, the outer peripheral surface of the fitting portion of the support member contacts the inner peripheral surface of the outer tube member, and the support member can be guided to move in the press-fitting direction. Therefore, the cylindrical portion can be prevented from being pushed obliquely into the circular hole.
In the present invention, it is preferable that the support member has an abutting portion that abuts against an end surface of the other end of the outer tube member. Thereby, the cylindrical portion can be pushed into the circular hole until the abutment portion of the support member abuts against the end surface of the other end of the outer tube member. Therefore, when a plurality of flow control valves are assembled, the amount of press-fitting into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
In the present invention, it is preferable that the flow rate control valve further includes a valve body driving portion including the drive shaft, the support member is disposed inside a housing of the valve body driving portion and the outer tube member, and the housing and the outer tube member are welded. Thus, the housing and the outer tube member are directly welded, and the welding area can be reduced as compared with a structure in which the housing and the outer tube member of the valve element driving portion are welded to the support member.
In the present invention, it is preferable that the outer tube member is fixed to the support member in a state where an end surface of the other end of the outer tube member is in contact with the support member. Thus, when a plurality of flow control valves are assembled, the amount of press-fitting into the circular hole of the base member in the cylindrical portion of the support member can be made uniform.
In order to achieve the above object, another aspect of the present invention provides a method for assembling a flow control valve, the flow control valve including: a base member provided with a valve chamber and a valve port opening to the valve chamber; an outer tube member disposed outside the base member; a valve element disposed opposite to the valve port and opening/closing the valve port; a drive shaft, the valve core being provided at a distal end portion of the drive shaft; and a support member that supports the drive shaft so as to be movable in a direction in which the valve port and the valve body face each other, wherein the base member is provided with a flow path connected to the valve port and a pressure equalizing hole that connects the flow path to an outside of the base member, and wherein the method of assembling the flow control valve is characterized in that one end of the outer tube member is closed by the base member, a cylindrical portion provided on the support member and arranged coaxially with the drive shaft is press-fitted into a circular hole provided on the base member and arranged coaxially with the valve port, and the press-fitting of the cylindrical portion is advanced until the other end of the outer tube member abuts against the support member, whereby the other end of the outer tube member is closed by the support member, whereby a back pressure chamber that is partitioned from the valve chamber is formed outside of the base member, and the valve body or the drive shaft is arranged across the valve chamber and the back pressure chamber.
According to the present invention, one end of the outer tube member is closed with the base member. A cylindrical portion provided on the support member and disposed coaxially with the drive shaft is press-fitted into a circular hole provided on the base member and disposed coaxially with the valve port. The pushing cylinder portion is pushed in until the other end of the outer tube member comes into contact with the support member, and the other end of the outer tube member is closed by the support member, whereby a back pressure chamber partitioned from the valve chamber is formed on the outer side of the base member, and the valve body or the drive shaft is disposed so as to cross the valve chamber and the back pressure chamber. Thus, the cylindrical portion of the support member is press-fitted into the circular hole of the base member, and the base member and the support member are directly assembled, whereby axial displacement between the valve port and the valve body can be effectively suppressed with a relatively simple structure. In addition, the base member and the support member can be assembled more reliably by pressing the cylindrical portion into the circular hole. Further, by pushing the cylindrical portion until the other end of the outer tube member comes into contact with the support member and closing the other end of the outer tube member with the support member, the amount of pushing the cylindrical portion of the support member into the circular hole of the base member can be made uniform when the plurality of flow rate control valves are assembled.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the differential pressure applied to the valve element in the moving direction can be effectively reduced without restricting the shape of the valve element.
Drawings
Fig. 1 is a longitudinal sectional view (valve-open state) of a flow control valve according to a first embodiment of the present invention.
Fig. 2 is a longitudinal sectional view (valve-closed state) of the flow control valve of fig. 1.
Fig. 3 is an enlarged cross-sectional view of a valve body and its vicinity of the flow control valve of fig. 1.
Fig. 4 is a longitudinal sectional view (valve-open state) showing a structure of a modified example of the flow control valve of fig. 1.
Fig. 5 is a longitudinal sectional view (valve-closed state) showing a structure of a modified example of the flow control valve of fig. 1.
Fig. 6 is an enlarged cross-sectional view of a valve body and its vicinity of a flow control valve according to a second embodiment of the present invention.
Fig. 7 is an enlarged cross-sectional view of a valve body and its vicinity of a flow control valve according to a third embodiment of the present invention.
Detailed Description
(first embodiment)
A flow rate control valve according to a first embodiment of the present invention will be described below with reference to fig. 1 to 4.
Fig. 1 and 2 are longitudinal sectional views (valve-opening state and valve-closing state) of a flow control valve according to a first embodiment of the present invention. Fig. 3 is an enlarged cross-sectional view of a valve body and its vicinity of the flow control valve of fig. 1. Fig. 4 and 5 are longitudinal sectional views (valve-open state and valve-closed state) showing the structure of a modification of the flow control valve of fig. 1.
The flow control valve 1 of the present embodiment is an electrically operated valve used for adjusting the flow rate of a refrigerant in a refrigeration cycle or the like, for example.
The flow control valve 1 includes a valve body 5, a valve element 6, and a valve element driving unit 8.
The valve body 5 has a base member 10 and an outer cylinder member 20.
The base member 10 is made of, for example, a stainless steel material. The base member 10 is formed in a bottomed cylindrical shape as a whole. The base member 10 integrally has a substantially cylindrical base body 11 and a bottom wall 12 provided at a lower end of the base body 11.
The base body 11 is provided with a valve chamber 13 as a columnar space. The base body 11 is provided with a circular hole 14 which is an upward opening hole for positioning. The circular hole 14 is connected to the valve chamber 13. In this embodiment, the diameter of the valve chamber 13 is the same as the diameter of the circular hole 14.
The bottom wall 12 is provided with: a circular valve port 15 that opens to the valve chamber 13; a flow path 16 connected to the valve port 15 and extending downward; a pressure equalizing hole 17 extending in the lateral direction from the flow path 16; and a valve seat 18 surrounding the valve port 15. The valve port 15 and the flow passage 16 are provided so as to be smaller in diameter than the valve chamber 13 and coaxial with the valve chamber 13. The pressure equalizing hole 17 connects the flow passage 16 with a back pressure chamber 23, which will be described later, formed outside the base member 10. The valve element 6 is seated on the valve seat 18.
The outer tube member 20 is formed in a cylindrical shape and is made of, for example, a stainless steel material. The outer tube member 20 is disposed outside the base member 10, and accommodates the base member 10 inside. The bottom wall 12 of the base member 10 is fitted into a lower end 20a of the outer tube member 20 as one end, and the lower end 20a is closed by the base member 10. The lower end 20a of the outer tube member 20 is brazed to the bottom wall 12.
The valve body 5 has a first conduit 26 extending transversely through the outer cylinder member 20 and the base body 11 and connected to the valve chamber 13. The first conduit 26 is brazed to the outer barrel member 20. The valve body 5 further includes a second conduit 27 connected to the flow path 16 of the base body 11. The second conduit 27 is brazed to the bottom wall 12 of the base body 11.
The valve element 6 is made of, for example, a stainless steel material. The valve body 6 is formed in a solid (i.e., not hollow) cylindrical shape as a whole, and has a substantially conical shape facing downward at the lower end. The valve body 6 integrally includes a cylindrical body 31, a downward-facing generally conical tip 32 provided at the lower end of the body 31, and an annular projection 33 projecting laterally from the lower end of the body 31. The upper end surface 31a of the trunk 31 is provided with a mounting hole 31b. A distal end projection 64e of a distal end portion 64c of the drive shaft 64, which will be described later, is fitted into the mounting hole 31b. Thus, the valve body 6 is provided at the distal end portion 64c of the drive shaft 64. The trunk portion 31 is provided with a transverse hole 31c penetrating from the attachment hole 31b in the transverse direction. The fluid pressure in the mounting hole 31b is made the same as the fluid pressure on the outside of the valve body 6 by the lateral hole 31c, so that the tip protrusion 64e is restrained from coming out of the mounting hole 31b.
The valve body 6 is disposed in the valve chamber 13 so as to face the valve port 15 in the vertical direction. The valve body 6 moves in the up-down direction by the valve body driving section 8, and opens and closes the valve port 15. The up-down direction is the direction in which the valve port 15 is opposite to the valve element 6, and is the moving direction of the valve element 6. When the valve body 6 is separated from the valve seat 18, the valve port 15 is opened to be in a valve-open state. In the valve-open state, the first conduit 26 and the second conduit 27 are connected via the valve chamber 13. When the valve body 6 contacts the valve seat 18 (is seated on the valve seat 18), the valve port 15 is closed and the valve is closed. In the valve-closed state, the first conduit 26 and the second conduit 27 are cut off.
The tip end portion 32 of the valve body 6 has a solid structure, and there is no restriction on the shape of the tip end portion 32. Therefore, the shape of the tip end portion 32 of the valve element 6 may be a shape designed to obtain an equal percentage characteristic or a characteristic similar thereto as the flow rate characteristic. Examples of such a shape include a shape having an elliptical surface or a conical surface portion having a multi-stage conical shape. The taper angle of the stepped conical surface portion gradually increases as approaching the valve port 15 side so as to be pseudo-elliptical. Alternatively, the shape of the tip end portion 32 of the valve body 6 may be a shape designed to obtain linear characteristics as the flow rate characteristics.
The valve element driving portion 8 is attached to the upper portion of the valve main body 5. The valve element driving portion 8 moves the valve element 6 in the up-down direction to contact and separate the valve element 6 with respect to the valve seat 18, thereby closing or opening the valve port 15. The valve element driving portion 8 includes a housing 40 as a case, a motor portion 50, a driving mechanism portion 60, and a holder 70.
The housing 40 is made of, for example, a stainless steel material. The housing 40 is formed in a cylindrical shape with an upper end closed. A holder 70 (specifically, a holder body 71) described later is fitted into the lower end 40a of the housing 40, and the lower end 40a is closed by the holder 70. The lower end 40a of the housing 40 is welded to the holder 70.
The motor unit 50 includes: a rotor 51, the rotor 51 being rotatably accommodated inside the housing 40; and a stator 52, the stator 52 being disposed outside the housing 40. The stator 52 is composed of a yoke 53, a bobbin 54, a stator coil 55, a resin mold cover 56, and the like. The rotor 51 and the stator 52 constitute a stepping motor.
The drive mechanism 60 includes a guide bush 61, a valve shaft holder 62, a stopper mechanism 63, a drive shaft 64, and a seal member 65.
The guide bush 61 integrally has a cylindrical small diameter portion 61a and a cylindrical large diameter portion 61b coaxially connected to the lower end of the small diameter portion 61 a. The inner diameter of the small diameter portion 61a is the same as the inner diameter of the large diameter portion 61b. An external thread 61c is provided on the outer peripheral surface of the small diameter portion 61 a. A transverse hole 61d penetrating in the transverse direction is provided in the small diameter portion 61 a.
The valve shaft holder 62 is formed in a cylindrical shape with an upper end closed. The valve shaft holder 62 integrally has a cylindrical peripheral wall portion 62a and an upper wall portion 62b closing the upper end of the peripheral wall portion 62 a. An internal thread 62c screwed with the external thread 61c of the guide bush 61 is provided on the inner peripheral surface of the peripheral wall portion 62 a. The upper wall 62b is integrally coupled to the rotor 51 via a support ring 66 fixed to the upper wall 62b by caulking. Accordingly, when the rotor 51 rotates, the valve shaft holder 62 also rotates. When the valve shaft holder 62 rotates, the valve shaft holder 62 moves in the axial direction (up-down direction) of the guide bush 61 by the feed screw action of the male screw 61c and the female screw 62c. A return spring 67 composed of a coil spring is provided above the valve shaft holder 62, and the return spring 67 is configured to facilitate re-screwing of the male screw 61c and the female screw 62c when they are disengaged from each other.
The stopper mechanism 63 has a lower stopper body 63a fixed to the guide bush 61 and an upper stopper body 63b fixed to the valve shaft holder 62. When the valve shaft holder 62 reaches the lower limit position, the lower stopper 63a and the upper stopper 63b of the stopper mechanism 63 abut against each other, and the movement of the valve shaft holder 62 relative to the guide bush 61 is restricted.
The drive shaft 64 is formed in an elongated cylindrical shape as a whole. The drive shaft 64 is inserted through the guide bush 61 and is disposed coaxially with the guide bush 61. The drive shaft 64 is integrally provided with an upper end portion 64a, a body portion 64b, and a distal end portion 64c in this order from the top down. The upper end portion 64a is formed to have a smaller diameter than the body portion 64b, and is inserted into a through hole of the upper wall portion 62b of the valve shaft holder 62. A push nut 64d is fixed to the upper end 64 a. The body 64b is supported by the guide bush 61 so as to be slidable in the up-down direction. Between the stepped portions of the upper end portion 64a and the trunk portion 64b and the upper wall portion 62b of the valve shaft holder 62, a compression coil spring 68 that always presses the drive shaft 64 downward is provided. By being provided with the jack nut 64d and the compression coil spring 68, the drive shaft 64 moves in the up-down direction with the movement of the valve shaft holder 62. The distal end portion 64c is provided with a thin distal end projection 64e fitted into the mounting hole 31b of the body portion 31 of the valve body 6. The drive shaft 64 is integrally provided with a flange portion 64f protruding in the lateral direction at the lower end of the trunk portion 64 b. The flange 64f has the same diameter as the trunk 31 of the valve body 6.
The seal member 65 is formed in an annular shape. The seal member 65 is fitted with a tip end portion 64c of the drive shaft 64. That is, the distal end portion 64c of the drive shaft 64 penetrates the seal member 65. The seal member 65 is disposed between the flange portion 64f and the upper end surface 31a of the body portion 31 of the valve body 6. In the present embodiment, the seal member 65 is provided with an annular gasket 65b made of Polytetrafluoroethylene (PTFE) on the outer side of an O-ring 65a made of a rubber material.
The holder 70 is made of, for example, a stainless steel material. The holder 70 integrally has a substantially disk-shaped holder body 71 and a cylindrical portion 72 as a positioning protrusion. The cylindrical portion 72 protrudes downward from the lower surface 71a of the holder body 71.
The upper end 20b of the outer tube member 20 is welded to the holder body 71 in a state where an end surface 20c of the upper end 20b as the other end thereof is in contact with the lower surface 71a of the holder body 71. The upper end 20b of the outer tube member 20 is closed by the holder main body 71. Thereby, the back pressure chamber 23 partitioned from the valve chamber 13 is formed by the base member 10, the outer cylinder member 20, and the holder main body 71. In addition, the lower end 40a of the housing 40 is welded to the holder body 71.
A circular press-fit hole 71b disposed coaxially with the cylindrical portion 72 is provided in the center of the upper surface of the holder body 71. The large diameter portion 61b of the guide bush 61 is press-fitted into the press-fitting hole 71b. Thus, the holder body 71 is integrated with the guide bush 61 in a state where the guide bush 61 and the cylindrical portion 72 are coaxially arranged. The retainer 70 and the guide bush 61 constitute a support member 69 that supports the drive shaft 64 so as to be movable in the direction in which the valve port 15 and the valve element 6 face each other. A shaft hole 71c through which the body portion 64b of the drive shaft 64 is inserted is provided in the center of the bottom surface of the press-fit hole 71b. A vertical hole 71d penetrating in the vertical direction is provided in the peripheral edge portion of the holder body 71.
The cylindrical portion 72 is pressed into the circular hole 14 of the base member 10. Thus, the holder 70 is directly assembled with the base member 10, and the cylindrical portion 72 and the circular hole 14 are coaxially arranged. The cylindrical portion 72 and the valve port 15 are also coaxially arranged. Further, by inserting the cylindrical portion 72 into the circular hole 14, the circular hole 14 restricts movement of the cylindrical portion 72 in a direction orthogonal to the up-down direction (opposite direction).
Inside the cylindrical portion 72, the body portion 31 of the valve body 6, the distal end portion 64c and the flange portion 64f of the drive shaft 64, and the sealing member 65 are disposed so as to be movable in the up-down direction. The gasket 65b disposed on the outer periphery of the seal member 65 is pressed against the inner surface of the cylindrical portion 72. Thereby, the sealing member 65 seals between the valve chamber 13 and the back pressure chamber 23. The seal member 65 slides on the inner peripheral surface of the cylindrical portion 72 as the drive shaft 64 moves in the up-down direction. A transverse hole 72a penetrating in the transverse direction is provided at the upper end of the cylindrical portion 72. In the present embodiment, the inner diameter of the cylindrical portion 72 (i.e., the diameter of the sealing portion sealed by the sealing member 65) is the same as the diameter of the valve port 15. The inner diameter of the cylindrical portion 72 may be different from the diameter of the valve port 15, but preferably the difference between them is reduced.
The flow control valve 1 seals the valve chamber 13 and the back pressure chamber 23 by a seal member 65 fitted into the distal end portion 64c of the drive shaft 64, and therefore the drive shaft 64 is disposed across the valve chamber 13 and the back pressure chamber 23. The flow path 16 of the base member 10 and the back pressure chamber 23 are connected through the pressure equalizing hole 17 of the base member 10. The back pressure chamber 23 and the inner space 41 of the housing 40 are connected by a longitudinal hole 71d of the holder body 71. Therefore, in the valve-closed state, the fluid pressure in the flow path 16 is the same as the fluid pressure in the back pressure chamber 23, and the difference (differential pressure) between the fluid pressure applied from the valve port 15 side to the valve element 6 and the fluid pressure applied from the back pressure chamber 23 side to the valve element 6 becomes small. In the present embodiment, the diameter of the valve port 15 (indicated by a double arrow D1 in fig. 3) is made the same as the inner diameter of the cylindrical portion 72 of the retainer 70 (indicated by a double arrow D2 in fig. 3). Therefore, the differential pressure is zero (including substantially zero), and the movement of the valve element 6 due to the differential pressure can be effectively suppressed.
The space 72b inside the cylindrical portion 72 above the flange portion 64f is connected to the back pressure chamber 23 through the lateral hole 72a. The space 72b is also connected to the back pressure chamber 23 through the inner space 41 of the housing 40, the lateral hole 61d of the guide bush 61, the gap between the guide bush 61 and the drive shaft 64, and the shaft hole 71c of the holder 70. Thus, even when the fluid pressure in the space 72b changes due to the movement of the flange portion 64f, the fluid pressure in the space 72b is quickly the same as the fluid pressure in the back pressure chamber 23.
Next, a method of assembling the flow control valve 1 described above will be described.
(1) The valve body 5 is assembled. Specifically, the base member 10 is fitted into the lower end 20a of the outer tube member 20, and the lower end 20a is closed. The first conduit 26 is inserted into the outer barrel member 20 and the base body 11 of the base member 10. The second conduit 27 is embedded in the bottom wall 12 of the base member 10. Then, brazing filler metal is placed at each brazing site and charged into a furnace, whereby brazing is performed.
(2) The valve element driving section 8 is assembled. Specifically, the large diameter portion 61b of the guide bush 61 is press-fitted into the press-fitting hole 71b of the holder body 71, and the holder body 71 and the guide bush 61 are integrated. The female screw 62c of the valve shaft holder 62 is screwed with the male screw 61c of the guide bush 61. The guide bush 61 is provided with a lower stopper 63a. The upper stopper 63b is mounted in advance on the valve shaft holder 62. The rotor 51 is coupled to the valve shaft holder 62 via a support ring 66. The distal end portion 64c of the drive shaft 64 is fitted into the sealing member 65, and the distal end protrusion 64e of the distal end portion 64c is fitted into the mounting hole 31b of the valve body 6, whereby the valve body 6 is mounted on the drive shaft 64. The drive shaft 64 is inserted into the cylindrical portion 72 of the holder 70, the shaft hole 71c of the holder 70, and the guide bush 61 from below. A compression coil spring 68 is provided at an upper end 64a of the drive shaft 64, and the upper end 64a is inserted into a through hole in the upper wall 62b of the valve shaft holder 62. A pusher nut 64d is fixed to an upper end 64a of the drive shaft 64, and a return spring 67 is disposed. Then, the assembly body in which the rotor 51, the guide bush 61, the valve shaft holder 62, the stopper mechanism 63, and the like are assembled is inserted into the inside of the housing 40. A holder body 71 is fitted into the lower end 40a of the housing 40, and the lower end 40a is closed by the holder body 71. The lower end 40a of the housing 40 is welded to the holder body 71. The stator 52 is mounted to the housing 40. In this state, the drive shaft 64 and the valve body 6 are disposed coaxially with the cylindrical portion 72.
(3) Then, the valve main body 5 and the valve element driving portion 8 are assembled. Specifically, the cylindrical portion 72 is pressed into the circular hole 14 of the base member 10. The pushing cylinder portion 72 is pushed until the end face 20c of the upper end 20b of the outer tube member 20 abuts against the holder body 71, and the upper end 20b is closed by the holder body 71, whereby the back pressure chamber 23 partitioned from the valve chamber 13 is formed outside the base member 10. Meanwhile, the drive shaft 64 is disposed so as to cross the valve chamber 13 and the back pressure chamber 23. Finally, the upper end 20b of the outer tube member 20 is welded to the holder body 71. Thus, the flow control valve 1 is completed.
As described above, according to the flow control valve 1 of the present embodiment, the lower end 20a of the outer tube member 20 is closed by the base member 10, and the upper end 20b of the outer tube member 20 is closed by the holder body 71, forming the back pressure chamber 23 partitioned from the valve chamber 13. The drive shaft 64 is disposed across the valve chamber 13 and the back pressure chamber 23. The base member 10 is provided with a flow passage 16 connected to the valve port 15 and a pressure equalizing hole 17 connecting the flow passage 16 to the back pressure chamber 23. In this way, the pressure equalizing hole 17 provided in the base member 10 can reduce the difference between the fluid pressure applied to the valve body 6 from the valve port 15 side and the fluid pressure applied to the valve body 6 from the back pressure chamber 23 side in the closed state. Therefore, the differential pressure applied to the valve body 6 in the moving direction can be effectively reduced without restricting the shape of the valve body 6.
The flow control valve 1 further includes a seal member 65, and the seal member 65 is formed in a ring shape through which the drive shaft 64 passes, and seals between the valve chamber 13 and the back pressure chamber 23. The inner diameter of the cylindrical portion 72 (which is the diameter of the sealing portion sealed by the sealing member 65, indicated by double arrow D2 in fig. 3) is the same as the diameter of the valve port 15 (indicated by double arrow D1 in fig. 3). In this way, in the valve-closed state, the difference between the fluid pressure applied to the valve body 6 from the valve port 15 side and the fluid pressure applied to the valve body 6 from the back pressure chamber 23 side can be made zero. Therefore, the differential pressure applied to the valve body 6 in the moving direction can be reduced more effectively without being restricted in the shape of the valve body 6.
The flow control valve 1 has a circular hole 14 arranged coaxially with the valve port 15 in the base member 10, and a cylindrical portion 72 arranged coaxially with the drive shaft 64 in the retainer 70. The cylindrical portion 72 is pressed into the circular hole 14. This allows the base member 10 and the retainer 70 to be directly assembled, and thus the axial displacement between the valve port 15 and the valve body 6 can be effectively suppressed with a relatively simple structure. In addition, the base member 10 and the holder 70 can be assembled more reliably by press fitting.
In addition, in a state where the end face 20c of the upper end 20b of the outer tube member 20 is in contact with the holder body 71, the outer tube member 20 and the holder body 71 are fixed by welding. Thus, when the plurality of flow control valves 1 are assembled, the amount of press-fitting of the cylindrical portion 72 into the circular hole 14 of the base member 10 can be made uniform.
In the above-described embodiment, the cylindrical portion 72 of the holder 70 is pressed into the circular hole 14 of the base member 10, but other configurations may be adopted. For example, the following structure may be adopted: the cylindrical portion 72 is inserted into the circular hole 14, and a sealing member such as an O-ring is provided between the outer peripheral surface of the cylindrical portion 72 and the inner peripheral surface of the circular hole 14.
In the above-described embodiment, the valve body 6 is formed separately from the drive shaft 64, but the valve body 6 may be formed integrally with the drive shaft 64 as in the flow control valve 1A shown in fig. 4 and 5, for example. In this structure, the valve body 6 includes a drive shaft 64, and the valve body 6 is disposed across the valve chamber 13 and the back pressure chamber 23. The seal member 65 is formed in an annular shape through which the valve body 6 passes, and seals between the valve chamber 13 and the back pressure chamber 23.
In the above-described embodiment, the circular hole 14 as the positioning hole is provided in the base member 10, and the cylindrical portion 72 as the positioning protrusion is provided in the holder 70, but the positioning protrusion may be provided in the base member 10 and the positioning hole may be provided in the holder 70, contrary to this.
(second embodiment)
A flow rate control valve according to a second embodiment of the present invention will be described below with reference to fig. 6.
Fig. 6 is an enlarged cross-sectional view of a valve body and its vicinity of a flow control valve according to a second embodiment of the present invention. In the flow control valve 2 according to the second embodiment shown in fig. 6, the same components as those of the flow control valve 1 are denoted by the same reference numerals, and description thereof is omitted.
The flow control valve 2 has a holder 70A having a different structure from the holder 70 of the flow control valve 1.
The holder 70A is made of, for example, a stainless steel material. The holder 70A integrally has a substantially disk-shaped holder body 71A and a cylindrical portion 72A as a positioning projection. The cylindrical portion 72A protrudes downward from the lower surface 71A of the holder body 71A.
The holder body 71A has the same outer diameter as the inner diameter of the outer cylinder member 20. The holder main body 71A corresponds to a fitting portion, and fits inside the upper end 20b of the outer tube member 20. The upper end 20b of the outer tube member 20 is closed by the holder main body 71A. The holder 70A and the guide bush 61 constitute a supporting member 69A. The support member 69A is disposed inside the housing 40 and the outer tube member 20. The lower end 40a of the housing 40 is welded to the upper end 20b of the outer barrel member 20. By directly welding the housing 40 and the outer tube member 20, the welding sites can be reduced as compared with the flow control valve 1 of the first embodiment in which the housing 40 and the outer tube member 20 are respectively welded to the holder 70.
The cylindrical portion 72A has a press-fit end portion 72c as a distal end portion and a main body portion 72d. The press-fit end portion 72c and the body portion 72d are connected in the up-down direction. The body portion 72d is formed to have a larger diameter than the press-in end portion 72 c. A stepped portion 72e is formed between the press-fitting end portion 72c and the main body portion 72d. The press-fit end 72c is press-fitted into the circular hole 14 until the stepped portion 72e abuts against the base member 10. Thus, the holder 70A is directly assembled with the base member 10, and the cylindrical portion 72A is disposed coaxially with the circular hole 14 (i.e., the valve port 15). The circular hole 14 restricts movement of the cylindrical portion 72A in a direction perpendicular to the up-down direction (opposite direction). The stepped portion 72e of the cylindrical portion 72A abuts against the base member 10. Therefore, when the plurality of flow control valves 2 are assembled, the amount of press-fitting into the circular hole 14 of the base member 10 in the cylindrical portion 72A can be made uniform.
The holder body 71A is fitted inside the upper end 20b of the outer tube member 20. Further, since the outer diameter of the holder body 71A is the same as the inner diameter of the outer tube member 20, the outer peripheral surface of the holder body 71A is formed to be in contact with the inner peripheral surface of the outer tube member 20. Thus, when the press-fit end 72c of the cylindrical portion 72A is press-fitted into the circular hole 14 of the base member 10, the outer peripheral surface of the holder main body 71A contacts the inner peripheral surface of the outer tube member 20, and moves in the up-down direction (press-fitting direction). Therefore, the press-fit end 72c of the cylindrical portion 72A can be prevented from being obliquely pressed into the circular hole 14.
In the present embodiment, the cylindrical portion 72A has a structure in which a stepped portion 72e is provided between the press-fitting end portion 72c and the main body portion 72d. In addition to this structure, the following structure may be adopted. That is, the cylindrical portion 72A has a press-fit end portion 72c as a distal end portion and a main body portion 72d connected to the press-fit end portion 72 c. The end of the body 72d on the press-fit end 72c side is provided with a protruding portion protruding radially outward from the press-fit end 72 c. The protruding portion is provided with one or a plurality of protruding portions at intervals in the circumferential direction, for example. The protruding portion is in contact with the base member 10. In this configuration, by pressing the press-fit end portion 72c into the circular hole 14 until the protruding portion comes into contact with the base member 10, the press-fit amount into the circular hole 14 of the base member 10 in the cylindrical portion 72A can be made uniform even when a plurality of flow rate control valves are assembled.
(third embodiment)
A flow rate control valve according to a third embodiment of the present invention will be described below with reference to fig. 7.
Fig. 7 is an enlarged cross-sectional view of a valve body and its vicinity of a flow control valve according to a third embodiment of the present invention. In the flow control valve 3 according to the third embodiment shown in fig. 7, the same components as those of the flow control valve 1 are denoted by the same reference numerals, and description thereof is omitted.
The flow control valve 3 has a holder 70B having a different structure from the holder 70 of the flow control valve 1.
The holder 70B is made of, for example, a stainless steel material. The holder 70B integrally has a substantially disk-shaped holder body 71B and a cylindrical portion 72B as a positioning protrusion. The cylindrical portion 72B protrudes downward from the lower surface 71a of the holder body 71B.
The holder body 71B has a fitting portion 71e and an abutment portion 71f. The fitting portion 71e is formed in a cylindrical shape, and has an outer diameter equal to an inner diameter of the outer tube member 20. The fitting portion 71e is fitted inside the upper end 20b of the outer tube member 20. The abutment portion 71f is an annular projection provided at an upper end of the outer peripheral surface of the fitting portion 71e so as to project radially outward. The outer diameter of the abutting portion 71f is formed to be the same as the inner diameter of the housing 40. The abutment portion 71f abuts against the end surface 20c of the upper end 20b of the outer tube member 20. The upper end 20B of the outer tube member 20 is closed by the holder main body 71B. The holder 70B and the guide bush 61 constitute a supporting member 69B. The support member 69B is disposed inside the housing 40 and the outer tube member 20. The lower end 40a of the housing 40 is welded to the upper end 20b of the outer barrel member 20.
The cylindrical portion 72B is pressed into the circular hole 14 of the base member 10. The abutting portion 71f of the holder body 71B abuts the end surface 20c of the upper end 20B of the outer tube member 20. Therefore, when the plurality of flow control valves 3 are assembled, the amount of press-fitting into the circular hole 14 of the base member 10 in the cylindrical portion 72B can be made uniform.
The fitting portion 71e of the holder body 71B is fitted inside the upper end 20B of the outer tube member 20. Since the outer diameter of the fitting portion 71e is the same as the inner diameter of the outer tube member 20, the outer peripheral surface of the fitting portion 71e is formed to be in contact with the inner peripheral surface of the outer tube member 20. Thus, when the cylindrical portion 72B is pressed into the circular hole 14 of the base member 10, the outer peripheral surface of the fitting portion 71e contacts the inner peripheral surface of the outer tube member 20, and moves in the vertical direction (press-in direction) to be guided. Therefore, the cylindrical portion 72B can be suppressed from being obliquely pressed into the circular hole 14.
The embodiments of the present invention have been described above, but the present invention is not limited to these examples. Those skilled in the art can appropriately add, delete, and design change the constituent elements of the above-described embodiments, and appropriately combine the features of the embodiments, and the present invention is also within the scope of the present invention as long as the gist of the present invention is not violated.
Description of symbols
(first embodiment)
1. 1A flow control valve, 5 valve body, 6 valve element, 8 valve element driving part, 10 base member, 11 base body, 12 bottom wall, 13 valve chamber, 14 circular hole, 15 valve port, 16 flow path, 17 equalizing hole, 18 valve seat, 20 outer cylinder member, 20a lower end, 20b upper end, 23 back pressure chamber, 26 first conduit, 27 second conduit, 31 body part, 31A upper end face, 31b mounting hole, 31c transverse hole, 32 top end part, 33 annular protruding part, 40 housing, 40a lower end, 41 inside space, 50 motor part, 51 rotor, 52 stator, 53 yoke, 54 coil frame, 55 stator coil, 56 resin mold cover, 60 driving mechanism part, 61 guide bushing 61A small diameter portion, 61b large diameter portion, 61c male screw, 61d cross hole, 62 valve shaft holder, 62a peripheral wall portion, 62b upper wall portion, 62c female screw, 63 stop mechanism, 63a lower stop body, 63b upper stop body, 64 drive shaft, 64a upper end portion, 64b body portion, 64c tip end portion, 64d push nut, 64e tip end protrusion, 64f flange portion, 65 sealing member, 65a O-ring, 65b packing, 66 supporting ring, 67 return spring, 68 compression coil spring, 69 supporting member, 70 holder, 71 holder body, 71A lower surface, 71b press hole, 71c shaft hole, 71d longitudinal hole, 72 cylindrical portion, 72a cross hole,
(second embodiment)
2 … flow control valve, 69A … support member, 70A … retainer, 71A … retainer body, 72A … cylindrical portion, 72c … press-in end portion, 72d … body portion, 72e … stepped portion,
(third embodiment)
3 … flow control valve, 69B … support member, 70B … holder, 71B … holder body, 72B … cylindrical portion, 71e … fitting portion, 71f … abutment portion.
Claims (9)
1. A flow control valve, comprising:
a base member provided with a valve chamber and a valve port opening to the valve chamber;
an outer tube member disposed outside the base member;
a valve element disposed opposite to the valve port and opening/closing the valve port;
a valve element driving unit including a drive shaft, the valve element being provided at a distal end portion of the drive shaft; and
a support member that supports the drive shaft so as to be movable in a direction in which the valve port and the valve element face each other,
one end of the outer tube member is closed by the base member, and the other end of the outer tube member is closed by the support member, forming a back pressure chamber partitioned from the valve chamber,
the spool or the drive shaft is disposed across the valve chamber and the back pressure chamber,
the base member is provided with a flow path connected to the valve port and a pressure equalizing hole connecting the flow path to the back pressure chamber,
the lower end of the housing of the spool driving part is closed by the supporting member,
a vertical hole connecting the back pressure chamber and the inner space of the shell is arranged at the periphery of the supporting component,
the support member is provided with a protrusion, the base member is provided with a hole into which the protrusion is inserted to restrict movement of the protrusion in a direction orthogonal to the opposing direction,
the base member is provided with a circular hole as the hole coaxially arranged with the valve port,
the support member is provided with a cylindrical portion as the protruding portion disposed coaxially with the drive shaft,
the cylindrical portion is pressed into the circular hole.
2. The flow control valve according to claim 1, wherein,
a sealing member formed in a ring shape through which the valve body or the drive shaft passes, the sealing member sealing between the valve chamber and the back pressure chamber,
the diameter of the sealing part sealed by the sealing component is the same as the diameter of the valve port.
3. A flow control valve according to claim 1 or 2, characterized in that,
the cylindrical portion has a press-fit end portion into which the circular hole is press-fitted, and a main body portion connected to the press-fit end portion and having a diameter larger than that of the press-fit end portion,
the stepped portion between the press-in end portion and the main body portion abuts the base member.
4. A flow control valve according to claim 1 or 2, characterized in that,
the cylindrical part has a press-in end portion pressed into the circular hole and a main body portion connected to the press-in end portion,
a protruding portion protruding radially outward from the press-fit end portion is provided at an end portion of the main body portion on the press-fit end portion side,
the protruding portion abuts against the base member.
5. A flow control valve according to claim 1 or 2, characterized in that,
the support member has a fitting portion fitted to the inner side of the outer tube member,
the outer peripheral surface of the fitting portion is formed to be in contact with the inner peripheral surface of the outer tube member.
6. A flow control valve according to claim 1 or 2, characterized in that,
the support member has an abutment portion that abuts against an end surface of the other end of the outer tube member.
7. A flow control valve according to claim 1 or 2, characterized in that,
the supporting member is disposed inside the housing and the outer tube member,
the housing and the outer barrel member are welded.
8. A flow control valve according to claim 1 or 2, characterized in that,
the outer tube member is fixed to the support member with the end surface of the other end of the outer tube member abutting the support member.
9. A method of assembling a flow control valve, the flow control valve comprising: a base member provided with a valve chamber and a valve port opening to the valve chamber; an outer tube member disposed outside the base member; a valve element disposed opposite to the valve port and opening/closing the valve port; a valve element driving unit including a drive shaft, the valve element being provided at a distal end portion of the drive shaft; and a support member that supports the drive shaft so as to be movable in a direction in which the valve port and the valve body face each other, wherein the base member is provided with a flow path connected to the valve port and a pressure equalizing hole that connects the flow path to an outside of the base member, and wherein the method of assembling the flow rate control valve is characterized in that,
closing one end of the outer cylinder member with the base member,
the lower end of the housing of the valve element driving part is closed by the supporting member,
a cylindrical portion provided on the support member and disposed coaxially with the drive shaft is press-fitted into a circular hole provided on the base member and disposed coaxially with the valve port,
pushing the cylinder until the other end of the outer tube member is in contact with the support member, closing the other end of the outer tube member by the support member, forming a back pressure chamber on the outside of the base member, the back pressure chamber being partitioned from the valve chamber, and disposing the valve body or the drive shaft across the valve chamber and the back pressure chamber,
a vertical hole is provided in a peripheral edge portion of the support member, the vertical hole connecting the back pressure chamber and an inner space of the housing.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-029199 | 2019-02-21 | ||
| JP2019029199 | 2019-02-21 | ||
| JP2019081869 | 2019-04-23 | ||
| JP2019-081869 | 2019-04-23 | ||
| PCT/JP2020/002714 WO2020170720A1 (en) | 2019-02-21 | 2020-01-27 | Flow control valve and assembly method for same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113677919A CN113677919A (en) | 2021-11-19 |
| CN113677919B true CN113677919B (en) | 2023-09-05 |
Family
ID=72144647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080008945.1A Active CN113677919B (en) | 2019-02-21 | 2020-01-27 | Flow control valve and method of assembling the same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6910683B2 (en) |
| CN (1) | CN113677919B (en) |
| WO (1) | WO2020170720A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019175129A1 (en) | 2018-03-12 | 2019-09-19 | Koninklijke Philips N.V. | Ultrasound imaging plane alignment using neural networks and associated devices, systems, and methods |
| JP7333045B2 (en) * | 2019-02-20 | 2023-08-24 | 株式会社不二工機 | flow control valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008064301A (en) * | 2006-08-07 | 2008-03-21 | Fuji Koki Corp | Pilot type control valve |
| CN107023691A (en) * | 2016-01-22 | 2017-08-08 | 株式会社不二工机 | Flow channel switching valve |
| CN107435754A (en) * | 2016-05-26 | 2017-12-05 | 株式会社不二工机 | Flow control valve |
| CN107631033A (en) * | 2016-07-19 | 2018-01-26 | 株式会社鹭宫制作所 | Motor-driven valve |
| JP2018159433A (en) * | 2017-03-23 | 2018-10-11 | 株式会社不二工機 | Flow regulation valve |
-
2020
- 2020-01-27 JP JP2020545208A patent/JP6910683B2/en active Active
- 2020-01-27 WO PCT/JP2020/002714 patent/WO2020170720A1/en active Application Filing
- 2020-01-27 CN CN202080008945.1A patent/CN113677919B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008064301A (en) * | 2006-08-07 | 2008-03-21 | Fuji Koki Corp | Pilot type control valve |
| CN107023691A (en) * | 2016-01-22 | 2017-08-08 | 株式会社不二工机 | Flow channel switching valve |
| CN107435754A (en) * | 2016-05-26 | 2017-12-05 | 株式会社不二工机 | Flow control valve |
| CN107631033A (en) * | 2016-07-19 | 2018-01-26 | 株式会社鹭宫制作所 | Motor-driven valve |
| JP2018159433A (en) * | 2017-03-23 | 2018-10-11 | 株式会社不二工機 | Flow regulation valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2020170720A1 (en) | 2021-03-11 |
| WO2020170720A1 (en) | 2020-08-27 |
| CN113677919A (en) | 2021-11-19 |
| JP6910683B2 (en) | 2021-07-28 |
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