JP2022015164A - Motor valve - Google Patents

Abstract

To provide a motor valve capable of making a seal member normally function to divide a valve chest and a back pressure chamber while securing contact accuracy between a valve element and a valve seat.SOLUTION: A motor valve 1 includes: a valve body 10 having a valve chest 14 and a valve port 13a; a valve element 30 for opening/closing the valve port 13a; and a support member 21 having a valve element guide hole 28 into which the valve element 30 is inserted. The motor valve 1 further includes: a pressure equalization passage 39 connecting a valve port 13a to a back pressure chamber 29 as a space on the upper end side of the valve element 30 in the valve element guide hole 28 in a valve closing state that a lower end 31b of the valve element 30 is in contact with the valve seat 13b; and a seal member 34 arranged between the valve element 30 and the support member 21. The valve element 30 has a groove-shaped valve chest side fluid introduction path 35 connecting the valve chest 14 to a valve chest side space 33a adjacent to the valve chest 14 side of the seal member 34.SELECTED DRAWING: Figure 2

Description

The present invention relates to an electric valve.

An example of a conventional motorized valve is disclosed in Patent Document 1. This motorized valve has a valve body that opens and closes a valve opening opened in the valve chamber. The valve body is inserted into the valve body guide hole of the support member. The valve body can move up and down in the valve body guide hole. A sealing member is arranged between the valve body and the support member. The sealing member separates the valve chamber and the space above the valve body (back pressure chamber) in the valve body guide hole. The motorized valve is closed when the lower end of the valve body comes into contact with the valve seat and the valve opening is closed. In the closed state, the valve port and the back pressure chamber are connected through a pressure equalizing passage provided in the valve body. This structure cancels the upward fluid pressure and the downward fluid pressure applied to the valve body.

Patent No. 6516960

The motorized valve having the above-mentioned structure can reduce the force required to move the valve body. Therefore, it is possible to adopt a relatively large valve port for the motorized valve. When the valve opening is enlarged in the motorized valve, it is necessary to reduce the gap between the valve body and the support member in order to bring the valve body and the valve seat into contact with each other with high accuracy. However, if this gap is made small, it becomes difficult for the fluid in the valve chamber and the fluid in the back pressure chamber to be introduced into the space adjacent to the sealing member. Therefore, the fluid pressure is not appropriately applied to the sealing member, and it becomes difficult for the sealing member to function normally. As a result, in the motorized valve, there is a possibility that the differential pressure capable of sealing the fluid between the valve chamber and the back pressure chamber may decrease, or the torque required for moving the valve body may increase.

Therefore, an object of the present invention is to provide an electric valve capable of normally functioning a sealing member that separates a valve chamber and a back pressure chamber while ensuring the contact accuracy between the valve body and the valve seat. do.

In order to achieve the above object, the electric valve according to the present invention has a valve body having a valve chamber and a valve opening, a valve body for opening and closing the valve opening, and a valve body guide hole into which the valve body is inserted. A support member and a back pressure chamber which is a space on the other end side of the valve body in the valve port and the valve body guide hole in a closed state where one end of the valve body is in contact with the valve seat of the valve port. It has a pressure equalizing passage to be connected and an annular sealing member arranged between the valve body and the support member so as to partition the valve chamber and the back pressure chamber, and has the valve body or the valve body or the back pressure chamber. The support member is characterized by having a groove-shaped or hole-shaped valve chamber-side fluid introduction path connecting the valve chamber and a space adjacent to the valve chamber side of the sealing member.

The motorized valve according to the present invention has a groove-shaped or hole-shaped valve chamber-side fluid introduction path in which the valve body or the support member connects the valve chamber and the space adjacent to the valve chamber side of the sealing member. .. From this, the motorized valve can introduce the fluid from the valve chamber into the space adjacent to the valve chamber side of the sealing member through the fluid introduction path on the valve chamber side. Therefore, in the motorized valve, the fluid pressure is appropriately applied to the sealing member, and the sealing member can function normally.

In the present invention, the valve body or the support member provides a groove-shaped or hole-shaped back pressure chamber side fluid introduction path connecting the back pressure chamber and the space adjacent to the back pressure chamber side of the sealing member. It is preferable to have it. By doing so, the fluid can be introduced from the back pressure chamber into the space adjacent to the back pressure chamber side of the sealing member through the back pressure chamber side fluid introduction path. Therefore, the fluid pressure is appropriately applied to the sealing member, and the sealing member can function normally.

In the present invention, the motorized valve has one or a plurality of the valve chamber side fluid introduction paths, and the total cross-sectional area of the valve chamber side fluid introduction paths is between the valve body and the support member. It is preferably larger than the cross-sectional area of the annular gap. By doing so, more fluid flows in one or more valve chamber side fluid introduction paths than the gap between the valve body and the support member, and the space adjacent to the valve chamber side of the sealing member from the valve chamber. The fluid can be introduced quickly. In addition, it is possible to prevent foreign matter from entering the gap between the valve body and the support member.

In the present invention, the valve body has an annular groove on the outer peripheral surface for holding the sealing member, and the sealing member is formed on an annular sealing portion made of a rubber-like elastic material and an outer peripheral portion of the sealing portion. It has an annular outer cap portion that is covered and slid with the support member, and the valve chamber side fluid introduction path connects the valve chamber and the space adjacent to the valve chamber side of the seal portion. It is preferable to do so. By doing so, the fluid in the valve chamber is introduced to the inside of the outer cap portion through the valve chamber side fluid introduction path, and the fluid in the valve chamber is introduced to the outside of the outer cap portion through the gap between the valve body and the support member. be introduced. As a result, fluid pressure can be appropriately applied to the outer cap portion. Therefore, it is possible to prevent the outer cap portion from being turned over and to appropriately slide the outer cap portion with the support member.

In the present invention, the support member has an annular groove for holding the sealing member on the inner peripheral surface of the valve body guide hole, and the sealing member has an annular sealing portion made of a rubber-like elastic material. It has an annular inner cap portion that covers the inner peripheral portion of the seal portion and slides with the valve body, and the valve chamber side fluid introduction path is the valve chamber and the valve chamber of the seal portion. It is preferable to connect to the space adjacent to the side. By doing so, the fluid in the valve chamber is introduced to the outside of the inner cap portion through the valve chamber side fluid introduction path, and the fluid in the valve chamber is introduced to the inside of the inner cap portion through the gap between the valve body and the support member. be introduced. As a result, fluid pressure can be appropriately applied to the inner cap portion. Therefore, it is possible to prevent the inner cap portion from being turned over and to appropriately slide the inner cap portion with the valve body.

In the present invention, the sealing member has an annular reinforcing member and a pair of annular packings arranged so as to sandwich the reinforcing member, and the sealing member is held by the valve body. It is preferable that the outer peripheral edge of the packing is provided with an outer lip that slides on the support member. By doing so, the fluid pressure can be appropriately applied to the packing. Therefore, the outer lip can be appropriately slid with the support member.

In the present invention, the sealing member has an annular reinforcing member and a pair of annular packings arranged so as to sandwich the reinforcing member, and the sealing member is held by the support member. It is preferable that the inner peripheral edge of the packing is provided with an inner lip that slides on the valve body. By doing so, the fluid pressure can be appropriately applied to the packing. Therefore, the inner lip can be appropriately slid with the valve body.

According to the present invention, the sealing member that separates the valve chamber and the back pressure chamber is normally formed while reducing the gap between the valve body and the support member to ensure the contact accuracy between the valve body and the valve seat. Can be made to work.

It is sectional drawing of the electric valve which concerns on one Embodiment of this invention. It is an enlarged sectional view of the electric valve of FIG. It is a figure explaining the structure of the fluid introduction passage of the electric valve of FIG. It is an enlarged sectional view of the electric valve of the 1st modification of the electric valve of FIG. It is a figure explaining the structure of the fluid introduction passage of the electric valve of FIG. It is an enlarged sectional view of the electric valve of the 2nd modification of the electric valve of FIG. It is a figure explaining the structure of the fluid introduction passage of the electric valve of FIG. It is an enlarged sectional view of the electric valve of the 3rd modification of the electric valve of FIG. FIG. 8 is an enlarged cross-sectional view of the inside of the alternate long and short dash line frame of FIG. It is an enlarged sectional view of the electric valve which concerns on the 4th modification of the electric valve of FIG. FIG. 3 is an enlarged cross-sectional view of the inside of the alternate long and short dash line frame of FIG.

Hereinafter, the configuration of the flow path switching valve according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a vertical cross-sectional view (cross-sectional view along the axis L) of the motorized valve according to the embodiment of the present invention. FIG. 1 shows an electric valve in a valve open state. FIG. 2 is an enlarged cross-sectional view of the motorized valve of FIG. FIG. 2 shows an electric valve in a closed state. FIG. 3 is a diagram illustrating a fluid introduction path of the motorized valve of FIG. FIG. 3A is a cross-sectional view taken along the line IIIA-IIIA of FIG. FIG. 3B is an enlarged cross-sectional view of the inside of the alternate long and short dash line frame of FIG.

The motorized valve 1 according to this embodiment is used as an expansion valve in, for example, a heat pump type heating / cooling system. The motorized valve 1 is a bidirectional flow type motorized valve in which a fluid (refrigerant) flows in both directions.

The motorized valve 1 has a valve body 10, a can 18, a support member 21, a bearing member 22, a valve body 30, a sealing member 34, and a valve body driving unit 40.

The valve body 10 has a tubular member 11, a holder 12, and a valve seat member 13.

The tubular member 11 has a substantially cylindrical shape. A valve chamber 14 is provided inside the tubular member 11.

The holder 12 has a stepped substantially cylindrical shape in which the outer diameter of the lower portion is larger than the outer diameter of the upper portion. The lower portion of the holder 12 is fitted into the upper end opening 11a of the tubular member 11. The tubular member 11 and the holder 12 are welded together. The fitting amount of the holder 12 and the tubular member 11 is set to such an extent that the fitting configuration is maintained even after welding.

The valve seat member 13 has a substantially cylindrical shape. The valve seat member 13 is housed in the valve chamber 14. The lower portion of the valve seat member 13 is fitted into the lower end opening 11b of the tubular member 11. The tubular member 11 and the valve seat member 13 are brazed. The valve seat member 13 has a valve opening 13a which is a circular hole. The valve opening 13a is open to the valve chamber 14. An annular valve seat 13b is provided on the inner edge of the upper end of the valve seat member 13. The valve seat 13b is arranged so as to surround the valve opening 13a.

A first conduit 15 is brazed to the tubular member 11. The first conduit 15 penetrates the tubular member 11 in the lateral direction (direction orthogonal to the axis L) and is connected to the valve chamber 14. A second conduit 16 is brazed to the valve seat member 13. The second conduit 16 is connected to the valve opening 13a. The length of insertion of the first conduit 15 into the tubular member 11 shall be such that the molten brazing (fillet) does not flow into the first conduit 15 from the valve chamber 14 side during brazing. Is desirable.

The can 18 has a cylindrical shape with the upper end closed. The lower end of the can 18 is welded to the upper part of the holder 12.

The support member 21 has a substantially cylindrical shape. The support member 21 is press-fitted into the holder 12 of the valve body 10. The support member 21 is arranged so as to face the valve seat member 13 at a distance in the vertical direction (axis L direction). The support member 21 has a partition wall 21a. The partition wall 21a vertically partitions the inner space of the support member 21. The space above the partition wall 21a is the spring chamber 27. The space below the partition wall 21a is the valve body guide hole 28.

The bearing member 22 has a bearing main body portion 22a and a bearing extension portion 22b. The bearing body 22a has a cylindrical shape. The bearing extension portion 22b has a cylindrical shape having an outer diameter smaller than that of the bearing main body portion 22a. The bearing extension portion 22b is coaxially connected to the lower end of the bearing main body portion 22a. A female screw 22c is provided on the inner peripheral surface of the bearing member 22. The female screw 22c is arranged so as to extend from the bearing extension portion 22b to the bearing main body portion 22a. The bearing member 22 is arranged inside the upper part of the support member 21. The bearing member 22 is caulked and joined to the upper part of the support member 21.

The valve body 30 opens and closes the valve opening 13a. The valve body 30 has a substantially cylindrical shape. The outer diameter of the valve body 30 is slightly smaller than the diameter of the valve body guide hole 28 of the support member 21. The valve body 30 is inserted into the valve body guide hole 28. The space above the valve body 30 in the valve body guide hole 28 becomes the back pressure chamber 29. The valve body 30 can slide and move in the vertical direction in the valve body guide hole 28. The valve body 30 is supported by the support member 21 so as to face the valve seat member 13 in the vertical direction. The valve body 30 is guided to move in the vertical direction by the support member 21.

The valve body 30 has a cylindrical body 31 and a pressing member 32. An annular plate-shaped pressing member 32 is arranged on the upper surface 31a of the cylindrical body 31. The pressing member 32 forms an annular groove 33 together with a notched step portion provided on the peripheral edge of the upper surface 31a of the cylindrical body 31. The annular groove 33 holds the annular sealing member 34.

The sealing member 34 is arranged between the valve body 30 and the support member 21 in a state of being compressed in the radial direction. The sealing member 34 closes between the valve body 30 and the support member 21. The sealing member 34 separates the valve chamber 14 and the back pressure chamber 29.

The sealing member 34 has a sealing portion 34a and an outer cap portion 34b. The seal portion 34a is a ring-shaped member made of a rubber-like elastic material (such as a rubber material or a synthetic resin material having rubber-like elasticity). The seal portion 34a is, for example, an O-ring. The outer cap portion 34b is an annular band-shaped member made of a synthetic resin such as polytetrafluoroethylene (PTFE), which has less elastic deformation than the seal portion 34a. The outer cap portion 34b covers the outer peripheral portion of the seal portion 34a. The outer peripheral surface of the outer cap portion 34b is in contact with the inner peripheral surface of the valve body guide hole 28. When the valve body 30 moves in the vertical direction, the outer peripheral surface of the outer cap portion 34b slides with the inner peripheral surface of the valve body guide hole 28. The material of the outer cap portion 34b is selected in consideration of slidability, foreign matter resistance, and wear resistance in an environment of a refrigerant state (high temperature gas, low temperature liquid, etc.) flowing inside. The sealing member 34 may be composed of, for example, only the sealing portion 34a.

An annular gap C1 is provided between the valve body 30 and the support member 21, specifically, between the outer peripheral surface of the cylindrical body 31 and the inner peripheral surface of the valve body guide hole 28. Further, an annular gap C2 is provided between the outer peripheral surface of the pressing member 32 and the inner peripheral surface of the valve body guide hole 28. In this embodiment, the gap C1 and the gap C2 have the same size. The gap C1 is on the valve chamber 14 side of the sealing member 34. The gap C2 is on the back pressure chamber 29 side of the sealing member 34.

A valve chamber side fluid introduction path 35 having a groove shape is provided on the outer peripheral surface of the cylindrical body 31. The valve chamber side fluid introduction path 35 extends linearly in the vertical direction from the vicinity of the lower end 31b of the cylindrical body 31 to the annular groove 33. In this embodiment, four valve chamber side fluid introduction paths 35 are provided and are arranged so as to be evenly spaced in the circumferential direction. The number of the valve chamber side fluid introduction paths 35 may be one or a plurality. The valve chamber side fluid introduction path 35 connects the valve chamber 14 and a space (valve chamber side space 33a) adjacent to the valve chamber 14 side of the sealing portion 34a of the sealing member 34 in the annular groove 33. .. The valve chamber side fluid introduction path 35 introduces the fluid in the valve chamber 14 into the valve chamber side space 33a.

A back pressure chamber side fluid introduction path 36 having a groove shape is provided on the outer peripheral surface of the pressing member 32. The back pressure chamber side fluid introduction path 36 extends linearly in the axis L direction from the upper surface of the pressing member 32 to the annular groove 33. In this embodiment, four back pressure chamber side fluid introduction paths 36 are provided and are arranged so as to be evenly spaced in the circumferential direction. The number of the fluid introduction paths 36 on the back pressure chamber side may be one or a plurality. The back pressure chamber side fluid introduction path 36 has a back pressure chamber 29 and a space (back pressure chamber side space 33b) adjacent to the back pressure chamber 29 side of the sealing portion 34a of the sealing member 34 in the annular groove 33. You are connected. The back pressure chamber side fluid introduction path 36 introduces the fluid in the back pressure chamber 29 into the back pressure chamber side space 33b. The size of the gap C2 between the outer peripheral surface of the pressing member 32 and the inner peripheral surface of the valve body guide hole 28 may be made larger, and the back pressure chamber side fluid introduction path 36 may be omitted.

The valve chamber side fluid introduction path 35 is a groove having a semicircular cross section. The valve chamber side fluid introduction path 35 may be a groove having a V-shaped cross section, a groove having a rectangular cross section, or the like. Alternatively, the valve chamber side fluid introduction path 35 may have a hole shape that passes through the valve body 30 as long as it connects the valve chamber 14 and the valve chamber side space 33a. Further, the back pressure chamber side fluid introduction path 36 is also a groove having a semicircular cross section. The back pressure chamber side fluid introduction path 36 may also have a V-shaped groove, a rectangular groove, or the like, or may have a hole shape.

The total cross-sectional area S2, which is the total cross-sectional area (cross-sectional area orthogonal to the axis L) of each valve chamber side fluid introduction path 35, is an annular gap C1 between the cylindrical body 31 of the valve body 30 and the support member 21. It is preferable that it is larger than the cross-sectional area S1 (cross-sectional area orthogonal to the axis L). By doing so, more fluid flows in the valve chamber side fluid introduction path 35 than in the gap C1, and the fluid in the valve chamber 14 can be quickly introduced into the valve chamber side space 33a. In addition, it is possible to prevent foreign matter from entering the gap C1. The total cross-sectional area of the back pressure chamber side fluid introduction path 36 is also preferably larger than the cross-sectional area of the annular gap C2 between the holding member 32 and the support member 21 of the valve body 30.

The valve body driving unit 40 moves the valve body 30 in the vertical direction to bring the valve body 30 into contact with and separate from the valve seat 13b of the valve seat member 13.

The valve body driving unit 40 includes a stator 42, a rotor 43, a rotor shaft 44, a connecting member 45, and a planetary gear mechanism 50. The stator 42 is arranged outside the can 18. The rotor 43 is rotatably arranged inside the can 18. The rotor 43 is connected to the rotor shaft 44 via a disk-shaped connecting member 45. The stator 42 and the rotor 43 form an electric motor. The planetary gear mechanism 50 slows down the rotation of the rotor 43.

The planetary gear mechanism 50 is arranged inside the rotor 43. The planetary gear mechanism 50 includes a gear case 51, a sun gear 52, a fixed ring gear 53, a planetary gear 54, a carrier 55, an output gear 56, and an output shaft 57. The gear case 51 has a cylindrical shape and is fixed to the upper part of the support member 21. The sun gear 52 is integrated with the connecting member 45. A rotor shaft 44 is inserted inside the sun gear 52. The fixed ring gear 53 is an internal gear and is fixed to the upper end of the gear case 51. A plurality of planetary gears 54 are provided so as to surround the sun gears 52. The planetary gear 54 meshes with the sun gear 52 and the fixed ring gear 53. The carrier 55 rotatably supports the planetary gear 54. The output gear 56 is an internal gear having a bottomed cylinder shape. The output gear 56 meshes with the planetary gear 54. The output shaft 57 has a substantially cylindrical shape. The output shaft 57 is arranged inside the bearing body 22a. The output shaft 57 is rotatably supported around the axis L by the bearing body 22a. The upper part of the output shaft 57 is press-fitted into the through hole at the bottom of the output gear 56. The output shaft 57 rotates together with the output gear 56. The output shaft 57 has a slit 57a extending upward from the lower surface.

Further, the valve body driving unit 40 has a spring receiving body 61, a valve opening spring 62, a thrust transmission member 63, a rotary elevating shaft 64, a ball 67, and a ball receiving seat 68.

The spring receiving body 61 has a cylindrical portion 61a, an annular-shaped upper hook portion 61b, and an annular-shaped lower hook portion 61c. The inner diameter of the cylindrical portion 61a is slightly larger than the outer diameter of the bearing extension portion 22b. A bearing extension portion 22b is inserted into the cylindrical portion 61a. The bearing extension portion 22b guides the vertical movement of the spring receiver 61. The upper hook portion 61b projects radially outward from the upper end of the cylindrical portion 61a. The lower hook portion 61c protrudes inward in the radial direction from the lower end of the cylindrical portion 61a. The spring receiver 61 is housed in the spring chamber 27.

The valve opening spring 62 is a spiral coil spring. The valve opening spring 62 is arranged in a compressed state between the partition wall 21a of the support member 21 and the upper hooking portion 61b of the spring receiving body 61 in the spring chamber 27. The valve opening spring 62 applies a force to push upward (in the valve opening direction) with respect to the spring receiving body 61.

The thrust transmission member 63 has a substantially cylindrical shape. The thrust transmission member 63 has an upper portion 63a, a central portion 63b, and a lower portion 63c which are sequentially arranged from the upper side to the lower side. The outer diameter of the upper portion 63a is larger than the outer diameter of the central portion 63b. The outer diameter of the central portion 63b is larger than the outer diameter of the lower portion 63c. The central portion 63b is inserted inside the through hole 21b provided in the partition wall 21a of the support member 21 and the lower hook portion 61c. It is desirable that the gap between the central portion 63b and the through hole 21b is small. The lower end of the upper portion 63a is in contact with the lower hook portion 61c. The lower portion 63c passes through the inside of the holding member 32 of the valve body 30 and is press-fitted into the hole 31c of the upper surface 31a of the cylindrical body 31. The pressing member 32 is held between the lower end of the central portion 63b and the upper surface 31a of the cylindrical body 31.

The thrust transmission member 63 has a vertical passage 63d and a horizontal passage 63e. The vertical passage 63d extends in the vertical direction. The horizontal passage 63e extends laterally from the vertical passage 63d in the central portion 63b. The pressure equalizing passage 39 is composed of the inner space 31d, the vertical passage 63d, and the horizontal passage 63e of the cylindrical body 31 of the valve body 30. The pressure equalizing passage 39 connects the valve port 13a and the back pressure chamber 29 in the closed state.

The rotary elevating shaft 64 is made of metal such as stainless steel, and has a cylindrical portion 65 and a flat plate portion 66. A male screw 65c is provided on the outer peripheral surface of the cylindrical portion 65. The male screw 65c is screwed into the female screw 22c of the bearing member 22. The flat plate portion 66 is continuously provided on the upper surface of the cylindrical portion 65. The thickness of the flat plate portion 66 is slightly smaller than the width of the slit 57a of the output shaft 57. The flat plate portion 66 is inserted into the slit 57a so as to be movable in the vertical direction. The rotary elevating shaft 64 is rotated along with the rotation of the output shaft 57, and moves in the vertical direction by the screw feeding action. The rotary elevating shaft 64 is connected to the valve body 30 via a ball 67, a ball receiving seat 68, and a thrust transmission member 63. It is desirable that the threaded portion such as the male screw 65c, the ball 67, and the ball receiving seat 68 have high hardness. In this embodiment, these members are heat-treated to increase their hardness.

In this embodiment, the tubular member 11, the valve seat member 13 (valve opening 13a, valve seat 13b), the support member 21, the valve body guide hole 28, the bearing member 22, the valve body 30, the rotor shaft 44, the output shaft 57, The axes of the spring receiver 61, the thrust transmission member 63, and the rotary elevating shaft 64 coincide with the axis L.

Next, an example of the operation of the motorized valve 1 according to this embodiment will be described.

In the motorized valve 1, a rotational force is generated in the rotor 43 by passing an electric current through the stator 42. The rotational force of the rotor 43 is decelerated by the planetary gear mechanism 50 and transmitted from the output shaft 57 to the rotary elevating shaft 64. The rotary elevating shaft 64 moves up and down according to the rotation direction due to the screw feeding action with the bearing member 22.

When the rotary elevating shaft 64 moves downward (valve closing direction), the thrust transmission member 63 is pushed downward via the ball 67 and the ball receiving seat 68. The valve body 30 moves downward together with the thrust transmission member 63, the lower end 31b of the cylindrical body 31 of the valve body 30 comes into contact with the valve seat 13b, and the valve opening 13a closes (valve closed state). At this time, the valve opening spring 62 is compressed. In the closed state, the valve port 13a and the back pressure chamber 29 are connected through the pressure equalizing passage 39. Therefore, the upward fluid pressure and the downward fluid pressure applied to the valve body 30 are canceled.

In order to effectively cancel the fluid pressure, the outer diameter D1 of the sealing member 34 and the diameter D2 of the valve seat 13b (specifically, the diameter of the contact point between the valve body 30 and the valve seat 13b) are made the same. Is desirable. However, these diameters may have a dimensional difference in consideration of the force of the valve opening spring 62. In the case of this embodiment, since the valve opening spring 62 is composed of a compression coil spring that exerts a pressing force in the valve opening direction above a certain level at any position from the valve closing to the fully opening position, the vicinity of the valve closing position. Then, a stronger pressing force is generated than the valve opening position. When the valve is closed, the rotary elevating shaft 64 must move the valve body 30 in the direction opposite to the pressing force in the valve opening direction (valve closing direction) by the valve opening spring 62. Therefore, the valve closing force can be increased by adopting a compression coil spring having a small pressing force as the valve opening spring 62 without changing the outer diameter D1 or the diameter D2. In the case of an application in which the fluid pressure on the second conduit 16 side becomes high when the valve is closed, the outer diameter D1 of the sealing member 34 is provided with a dimensional difference so as to be larger than the diameter D2 of the valve seat 13b (D1> D2). As a result, the force pushing the valve body in the valve closing direction (valve closing force) can be increased. Further, if a compression coil spring having a small spring constant is adopted as the valve opening spring 62, the influence of the change in the pressing force depending on the position of the valve body in the elevating direction (change in the load applied to the rotary elevating shaft 64, etc.) can be reduced. can. In this embodiment, the pressing force by the spring is generated in the valve opening direction, but in the configuration in which the pressing force of the spring is generated in the valve closing direction, the pressing force in the valve opening direction is set by setting D2> D1. Can be increased.

When the rotary elevating shaft 64 moves upward in the valve closed state, the valve opening spring 62 is restored and the spring receiver 61 moves upward. The upper portion 63a of the thrust transmission member 63 is caught by the lower hook portion 61c of the spring receiver 61, and the thrust transmission member 63 is pulled upward. The valve body 30 moves upward together with the thrust transmission member 63, the lower end 31b of the cylindrical body 31 of the valve body 30 is separated from the valve seat 13b, and the valve opening 13a opens (valve open state).

The valve chamber 14 and the valve chamber side space 33a of the annular groove 33 of the valve body 30 are connected by the valve chamber side fluid introduction path 35. Therefore, the fluid in the valve chamber 14 is introduced into the valve chamber side space 33a, and the pressure of the fluid is appropriately applied to the sealing member 34. Further, the back pressure chamber 29 and the back pressure chamber side space 33b of the annular groove 33 of the valve body 30 are connected by the back pressure chamber side fluid introduction path 36. Therefore, the fluid in the back pressure chamber 29 is introduced into the back pressure chamber side space 33b, and the pressure of the fluid is appropriately applied to the sealing member 34. As a result, the sealing member 34 functions normally.

From the above, in the motorized valve 1 according to the present embodiment, the valve body 30 has a groove-shaped valve chamber side fluid in which the valve chamber 14 connects the valve chamber 14 and the valve chamber side space 33a adjacent to the valve chamber 14 side of the sealing member 34. It has an introduction path 35. Further, the valve body 30 has a groove-shaped back pressure chamber side fluid introduction path 36 that connects the back pressure chamber 29 and the back pressure chamber side space 33b adjacent to the back pressure chamber 29 side of the sealing member 34. There is. From this, the electric valve 1 can introduce the fluid from the valve chamber 14 into the valve chamber side space 33a through the valve chamber side fluid introduction path 35, and the back pressure chamber side fluid introduction path 36 allows the electric valve 1 to introduce the fluid into the back pressure chamber side fluid introduction path 36. A fluid can be introduced from the compression chamber 29 into the back pressure chamber side space 33b. Therefore, in the motorized valve 1, fluid pressure is appropriately applied to the sealing member 34, and the gaps C1 and C2 between the valve body 30 and the support member 21 are reduced to improve the contact accuracy between the valve body 30 and the valve seat 13b. While ensuring, the sealing member 34 can function normally.

Further, the motorized valve 1 has a plurality of fluid introduction paths 35 on the valve chamber side. The total cross-sectional area S2 of the valve chamber side fluid introduction path 35 is larger than the cross-sectional area S1 of the annular gap C1 between the valve body 30 and the support member 21. By doing so, a large amount of fluid flows in the plurality of valve chamber side fluid introduction paths 35 from the gap C1, and the fluid flows from the valve chamber 14 to the valve chamber side space 33a adjacent to the valve chamber 14 side of the sealing member 34. Can be introduced promptly. In addition, it is possible to prevent foreign matter from entering the gap C1.

Further, the valve body 30 has an annular groove 33 on the outer peripheral surface for holding the sealing member 34. The sealing member 34 has an annular sealing portion 34a made of a rubber-like elastic material, and an annular outer cap portion 34b that covers the outer peripheral portion of the sealing portion 34a and slides with the support member 21. .. Then, the valve chamber side fluid introduction path 35 connects the valve chamber 14 and the valve chamber side space 33a adjacent to the valve chamber 14 side of the seal portion 34a, and the back pressure chamber side fluid introduction path 36 is the back pressure chamber 29. And the back pressure chamber side space 33b adjacent to the back pressure chamber 29 side of the seal portion 34a are connected. By doing so, the fluid in the valve chamber 14 is introduced into the inside of the outer cap portion 34b through the valve chamber side fluid introduction path 35, and the fluid in the valve chamber 14 is introduced to the outside of the outer cap portion 34b through the gap C1. Will be done. The fluid in the back pressure chamber 29 is introduced into the inside of the outer cap portion 34b through the back pressure chamber side fluid introduction path 36, and the fluid in the back pressure chamber 29 is introduced to the outside of the outer cap portion 34b through the gap C2. As a result, fluid pressure can be appropriately applied to the outer cap portion 34b. Therefore, it is possible to prevent the outer cap portion 34b from being turned over and to appropriately slide the outer cap portion 34b with the support member 21.

Next, a modified example of the motorized valve 1 according to the above-described embodiment will be described. In the following description, the same components as those of the motorized valve 1 (including substantially the same) are designated by the same reference numerals, and the description thereof will be omitted.

(First modification)
The motorized valve 1A, which is the first modification of the motorized valve 1 described above, is shown in FIGS. 4 and 5.

FIG. 4 is an enlarged cross-sectional view of the motorized valve of the first modification of the motorized valve of FIG. FIG. 5 is a diagram illustrating a configuration of a fluid introduction path of the motorized valve of FIG. FIG. 5A is a cross-sectional view taken along the line VA-VA of FIG. FIG. 5B is an enlarged cross-sectional view of the inside of the alternate long and short dash line frame of FIG.

The motorized valve 1A has a plurality of valve chamber side fluid introduction paths 35A having a hole shape and a plurality of back pressure chamber side fluid introduction paths 36A having a hole shape. The configuration of the motorized valve 1A is substantially the same as that of the motorized valve 1 described above, except for the valve body 30A (cylindrical body 31A and holding member 32A) provided with the valve chamber side fluid introduction path 35A and the back pressure chamber side fluid introduction path 36A. Is the same as.

The valve chamber side fluid introduction path 35A connects the valve chamber 14 and the valve chamber side space 33a of the annular groove 33. The valve chamber side fluid introduction path 35A introduces the fluid in the valve chamber 14 into the valve chamber side space 33a. The back pressure chamber side fluid introduction path 36A connects the back pressure chamber 29 and the back pressure chamber side space 33b of the annular groove 33. The back pressure chamber side fluid introduction path 36A introduces the fluid in the back pressure chamber 29 into the back pressure chamber side space 33b.

(Second modification)
The motorized valve 1B, which is a second modification of the motorized valve 1 described above, is shown in FIGS. 6 and 7.

FIG. 6 is an enlarged cross-sectional view of the motorized valve of the second modification of the motorized valve of FIG. FIG. 7 is a diagram illustrating the configuration of the fluid introduction path of the motorized valve of FIG. FIG. 7A is a cross-sectional view taken along the line VIIA-VIIA of FIG. FIG. 7B is an enlarged cross-sectional view of the inside of the alternate long and short dash line frame of FIG.

The motorized valve 1B is provided with an annular groove 23 on the inner peripheral surface of the valve body guide hole 28 of the support member 21B. The annular groove 23 holds the annular sealing member 24. The sealing member 24 is arranged between the valve body 30B and the support member 21B in a state of being compressed in the radial direction. The sealing member 24 closes between the valve body 30B and the support member 21B. The sealing member 24 separates the valve chamber 14 and the back pressure chamber 29. The configuration of the motor-operated valve 1B other than the support member 21B, the sealing member 24, and the valve body 30B is substantially the same as that of the motor-operated valve 1 described above.

The sealing member 24 has a sealing portion 24a and an inner cap portion 24b. The seal portion 24a is an annular member made of a rubber-like elastic material. The seal portion 24a is, for example, an O-ring. The inner cap portion 24b is an annular band-shaped member made of a synthetic resin such as PTFE. The inner cap portion 24b covers the inner peripheral portion of the seal portion 24a. The inner peripheral surface of the inner cap portion 24b is in contact with the outer peripheral surface of the valve body 30B. When the valve body 30B moves in the vertical direction, the inner peripheral surface of the inner cap portion 24b slides with the outer peripheral surface of the valve body 30B. The sealing member 24 may be composed of, for example, only the sealing portion 24a.

The support member 21B is provided with a plurality of valve chamber side fluid introduction paths 25B having a hole shape. The valve chamber side fluid introduction path 25B extends linearly in the vertical direction from the lower end of the support member 21B to the annular groove 23. The valve chamber side fluid introduction path 25B is formed by fitting a cylindrical member 21c having a groove on the outer peripheral surface inside the lower portion of the support member 21B.

The valve body 30B has a cylindrical body 31B. The lower portion 63c of the thrust transmission member 63 is press-fitted into the hole 31c of the upper surface 31a of the cylindrical body 31B. The lower end of the central portion 63b of the thrust transmission member 63 is in contact with the upper surface 31a.

The valve chamber side fluid introduction path 25B connects the valve chamber 14 and a space (valve chamber side space 23a) adjacent to the valve chamber 14 side of the sealing portion 24a of the sealing member 24 in the annular groove 23. .. The valve chamber side fluid introduction path 25B introduces the fluid in the valve chamber 14 into the valve chamber side space 23a.

(Third modification example)
The motorized valve 1C, which is a third modification of the motorized valve 1 described above, is shown in FIGS. 8 and 9.

FIG. 8 is an enlarged cross-sectional view of the motorized valve according to the third modification of the motorized valve of FIG. FIG. 9 is an enlarged cross-sectional view of the inside of the alternate long and short dash line frame of FIG.

The motorized valve 1C is provided with a relatively large gap between the upper portion of the valve body 30C and the valve body guide hole 28. The ring-shaped sealing member 37 is provided so as to project from the outer peripheral surface of the valve body 30C. The sealing member 37 is arranged between the valve body 30C and the support member 21. The configuration of the motor-operated valve 1C other than the sealing member 37 and the valve body 30C is substantially the same as that of the motor-operated valve 1 described above.

The sealing member 37 is held between the cylindrical body 31C of the valve body 30C and the pressing member 32C. The sealing member 37 has an annular reinforcing member 37a and annular packings 37b and 37b. The reinforcing member 37a is made of, for example, a resin material such as polyphenylene sulfide (PPS) or a metal material such as brass. The packing 37b is made of a resin material such as PTFE. The packings 37b and 37b form a pair. The packings 37b and 37b are arranged so as to sandwich the reinforcing member 37a in the vertical direction. An annular outer lip 37c is provided on the outer peripheral edge of the packing 37b. The packing 37b has a substantially L-shaped cross section. The outer lip 37c is slid with the inner peripheral surface of the valve body guide hole 28.

The cylindrical body 31C of the valve body 30C is provided with a plurality of valve chamber side fluid introduction paths 35C having a groove shape on the outer peripheral surface. The valve chamber side fluid introduction path 35C connects the valve chamber 14 and the space adjacent to the valve chamber 14 side of the sealing member 37 (valve chamber side space 77). The valve chamber side fluid introduction path 35C introduces the fluid in the valve chamber 14 into the valve chamber side space 77.

(Fourth modification)
The motorized valve 1D, which is the fourth modification of the motorized valve 1 described above, is shown in FIGS. 10 and 11.

FIG. 10 is an enlarged cross-sectional view of the motorized valve according to the fourth modification of the motorized valve of FIG. FIG. 11 is an enlarged cross-sectional view of the inside of the alternate long and short dash line frame of FIG.

The motorized valve 1D is provided with a relatively large gap between the valve body 30D and the valve body guide hole 28. The inner diameter near the lower end of the valve body guide hole 28 is slightly larger than the outer diameter of the valve body 30D. The ring-shaped sealing member 38 is provided so as to project from the outer peripheral surface of the support member 21D. The sealing member 38 is arranged between the valve body 30D and the support member 21D. The configuration of the motor-operated valve 1D other than the support member 21D, the sealing member 38, and the valve body 30D is substantially the same as that of the motor-operated valve 1 described above.

The sealing member 38 is held by the support member 21D. The sealing member 38 has an annular reinforcing member 38a and annular packings 38b and 38b. The reinforcing member 38a is made of, for example, a resin material such as PPS or a metal material such as brass. The packing 38b is made of a resin material such as PTFE. The packings 38b and 38b form a pair. The packings 38b and 38b are arranged so as to sandwich the reinforcing member 38a in the vertical direction. An annular inner lip 38c is provided on the inner peripheral edge of the packing 38b. The packing 38b has a substantially L-shaped cross section. The inner lip 38c is slid with the inner peripheral surface of the valve body 30D.

The valve body 30D has a cylindrical body 31D. The lower portion 63c of the thrust transmission member 63 is press-fitted into the hole 31c of the upper surface 31a of the cylindrical body 31D. The lower end of the central portion 63b of the thrust transmission member 63 is in contact with the upper surface 31a.

The support member 21D is provided with a valve chamber side fluid introduction path 25D having a hole shape. The valve chamber side fluid introduction path 25D penetrates the support member 21D in the lateral direction.

The valve chamber side fluid introduction path 25D connects the valve chamber 14 and the space adjacent to the valve chamber 14 side of the sealing member 38 (valve chamber side space 78). The valve chamber side fluid introduction path 25D introduces the fluid in the valve chamber 14 into the valve chamber side space 78.

The motorized valves 1A to 1D of the first modified example to the fourth modified example have the same action and effect as the above-mentioned electric valve 1.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is not contrary to the above-mentioned embodiments, those skilled in the art appropriately adding, deleting, or changing the design, or combining the features of the examples as appropriate are also present inventions. Is included in the range of.

1 ... Electric valve, 10 ... Valve body, 11 ... Cylindrical member, 11a ... Upper end opening, 11b ... Lower end opening, 12 ... Holder, 13 ... Valve seat member, 13a ... Valve mouth, 13b ... Valve seat, 14 ... Valve chamber , 15 ... 1st conduit, 16 ... 2nd conduit, 18 ... can, 21 ... support member, 21a ... partition wall, 21b ... through hole, 22 ... bearing member, 22a ... bearing body, 22b ... bearing extension, 22c ... Female screw, 27 ... Spring chamber, 28 ... Valve body guide hole, 29 ... Back pressure chamber, 30 ... Valve body, 31 ... Cylindrical body, 31a ... Top surface, 31b ... Lower end, 31c ... Hole, 31d ... Inner space, 32 ... Presser Member, 33 ... annular groove, 33a ... valve chamber side space, 33b ... back pressure chamber side space, 34 ... sealing member, 34a ... seal portion, 34b ... outer cap portion, 35 ... valve chamber side fluid introduction path, 36 ... Back pressure chamber side fluid introduction path, 39 ... pressure equalizing passage, 40 ... valve body drive unit, 42 ... stator, 43 ... rotor, 44 ... rotor shaft, 45 ... connecting member, 50 ... planetary gear mechanism, 51 ... gear case, 52 ... Sun gear, 53 ... Fixed ring gear, 54 ... Planetary gear, 55 ... Carrier, 56 ... Output gear, 57 ... Output shaft, 57a ... Slit, 61 ... Spring receiver, 61a ... Cylindrical part, 61b ... Upper hook part, 61c ... lower hooking part, 62 ... valve opening spring, 63 ... thrust transmission member, 63a ... upper part, 63b ... central part, 63c ... lower part, 63d ... vertical passage, 63e ... horizontal passage, 64 ... rotary elevating shaft, 65 ... Cylinder part, 65c ... Male screw, 66 ... Flat plate part, 67 ... Ball, 68 ... Ball receiving seat, C1 ... Gap, S1 ... Cross-sectional area, S2 ... Total cross-sectional area, L ... Axis line (first modification)
1A ... Electric valve, 30A ... Valve body, 31A ... Cylindrical body, 32A ... Holding member, 35A ... Valve chamber side fluid introduction path, 36A ... Back pressure chamber side fluid introduction path (second modification)
1B ... electric valve, 21B ... support member, 21c ... cylindrical member, 23 ... annular groove, 23a ... valve chamber side space, 24 ... sealing member, 24a ... seal portion, 24b ... inner cap portion, 25B ... valve chamber side fluid Introductory path, 30B ... valve body, 31B ... cylindrical body (third modification)
1C ... Electric valve, 30C ... Valve body, 31C ... Cylindrical body, 32C ... Holding member, 35C ... Valve chamber side fluid introduction path, 37 ... Sealing member, 37a ... Reinforcing member, 37b ... Packing, 37c ... Outer lip, 77 … Valve chamber side space (4th modification)
1D ... Electric valve, 21D ... Support member, 25D ... Valve chamber side fluid introduction path, 30D ... Valve body, Cylindrical body 31D, 38 ... Sealing member, 38a ... Reinforcing member, 38b ... Packing, 38c ... Inner lip, 78 ... Valve chamber side space

Claims (7)

A valve body having a valve chamber and a valve opening, a valve body that opens and closes the valve opening, a support member having a valve body guide hole into which the valve body is inserted, and one end of the valve body is a valve seat of the valve opening. A pressure equalizing passage connecting the valve port and the back pressure chamber, which is a space on the other end side of the valve body in the valve body guide hole, and the valve chamber and the back pressure chamber in a closed state in contact with the valve chamber. It has an annular sealing member arranged between the valve body and the support member so as to partition the valve body.
The valve body or the support member is characterized by having a groove-shaped or hole-shaped valve chamber-side fluid introduction path connecting the valve chamber and a space adjacent to the valve chamber side of the sealing member. Electric valve. The valve body or the support member has a groove-shaped or hole-shaped back pressure chamber side fluid introduction path connecting the back pressure chamber and a space adjacent to the back pressure chamber side of the sealing member. , The electric valve according to claim 1. The motorized valve has one or more fluid introduction paths on the valve chamber side.
The electric valve according to claim 1 or 2, wherein the total cross-sectional area of the valve chamber side fluid introduction path is larger than the cross-sectional area of the annular gap between the valve body and the support member. The valve body has an annular groove on the outer peripheral surface for holding the sealing member.
The sealing member has an annular sealing portion made of a rubber-like elastic material, and an annular outer cap portion that covers the outer peripheral portion of the sealing portion and slides with the support member.
The electric valve according to any one of claims 1 to 3, wherein the fluid introduction path on the valve chamber side connects the valve chamber and a space adjacent to the valve chamber side of the seal portion. The support member has an annular groove on the inner peripheral surface of the valve body guide hole for holding the sealing member.
The sealing member has an annular sealing portion made of a rubber-like elastic material, and an annular inner cap portion that covers the inner peripheral portion of the sealing portion and slides with the valve body.
The electric valve according to any one of claims 1 to 3, wherein the fluid introduction path on the valve chamber side connects the valve chamber and a space adjacent to the valve chamber side of the seal portion. The sealing member has an annular reinforcing member and a pair of annular packings arranged so as to sandwich the reinforcing member.
The sealing member is held by the valve body and
The electric valve according to any one of claims 1 to 3, wherein an outer lip that slides on the support member is provided on the outer peripheral edge of the packing. The sealing member has an annular reinforcing member and a pair of annular packings arranged so as to sandwich the reinforcing member.
The sealing member is held by the support member and
The electric valve according to any one of claims 1 to 3, wherein an inner lip that slides on the valve body is provided on the inner peripheral edge of the packing.

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