JP2022039055A - Motor-operated valve - Google Patents

Abstract

To provide a motor-operated valve that can effectively restrain a position shift of a valve port and a valve element.SOLUTION: A motor-operated valve 1 comprises a valve body 10 having a cylindrical shape, a valve seat member 20 attached to a lower end part of the valve body 10, a can 30 attached to an upper end part of the valve body 10, and a valve element 40 arranged so as to be opposed to a valve port 23 of the valve seat member 20. The motor-operated valve 1 comprises a valve stem 45 in which the valve element 40 is connected to a lower end part via a connection mechanism 50, and a guide stem 60 supporting the valve stem 45 movably in an up-down direction. The guide stem 60 is fitted to only the valve seat member 20. The guide stem 60 is pressed toward the side of the valve seat member 20 by a plate spring 17 attached to the valve body 10.SELECTED DRAWING: Figure 2

Description

The present invention relates to an electric valve.

An example of a conventional motorized valve is disclosed in Patent Documents 1 and 2.

The motorized valve of Patent Document 1 has a valve body having a cylindrical shape. A valve seat member is attached to the lower end of the valve body. The valve seat member has a valve opening. A can is welded to the outer peripheral edge of the upper end surface of the valve body. A support member (guide stem) is arranged inside the valve body and the can. A flange-shaped disk as a support member is welded to the inner peripheral edge of the upper end surface of the valve body. The support member supports the valve shaft so as to be movable in the vertical direction. A male screw is provided on the valve shaft. The male screw of the valve shaft is screwed into the female screw provided on the support member. A valve holder is fixed to the lower end of the valve shaft. The valve holder holds the valve body. The valve body is arranged so as to face the valve opening in the vertical direction. The support member supports the valve holder so that it can move in the vertical direction.

In the motorized valve of Patent Document 1, the support member is assembled to the valve seat member via the valve body. Therefore, the stacking of dimensional tolerances of each member may affect the position accuracy of the valve opening of the valve seat member and the valve body supported by the support member via the valve holder.

The motorized valve of Patent Document 2 has a fitting portion in which a support member (guide bush) is fitted with a valve seat member. Therefore, the support member and the valve seat member are directly assembled, and the stacking of dimensional tolerances of the members can be reduced.

Japanese Unexamined Patent Publication No. 2018-71643 Japanese Unexamined Patent Publication No. 2013-133914

However, in the motorized valve of Patent Document 2, the support member is also fitted with the valve body. Therefore, if the position of the valve seat member is deviated from the valve body, the support member may not be properly fitted to the valve seat member. As a result, the positions of the valve port and the valve body may be displaced.

Therefore, an object of the present invention is to provide an electric valve capable of effectively suppressing a misalignment between a valve port and a valve body.

In order to achieve the above object, the electric valve according to the present invention has a tubular valve body, a valve seat member attached to one end of the valve body, and the other end of the valve body. The attached can, the valve body arranged so as to face the valve opening of the valve seat member, the valve shaft whose valve body is provided on the valve seat member side, and the valve shaft are the valve body. And a support member that supports the valve so as to be movable in a direction facing the valve port, the support member is fitted only to the valve seat member, and the holding member attached to the valve body causes the support member. It is characterized in that it is pushed toward the valve seat member side.

In the motorized valve according to the present invention, the support member is directly assembled only to the valve seat member and is held between the valve seat member and the holding member attached to the valve body. Therefore, the motorized valve can reduce the stacking of dimensional tolerances of each member, and can correctly fit the support member and the valve seat member. Therefore, the motorized valve according to the present invention can effectively suppress the positional deviation between the valve port and the valve body.

In the present invention, the motorized valve has a rotor arranged inside the can and connected to the valve shaft, and a stator arranged outside the can, and the valve seat member with respect to the valve body. The size of the gap between the rotor and the can, and the size of the gap between the rotor and the can so that the support member comes into contact with the valve body before the rotor comes into contact with the can when the inclination of the rotor is gradually increased. It is preferable that the size of the gap between the support member and the valve body is set. When the valve seat member is tilted with respect to the valve body, the support member is also tilted with respect to the valve body, but the support member does not tilt beyond the tilt when the support member is in contact with the valve body. Therefore, by making the support member come into contact with the valve body before the rotor comes into contact with the can, it is possible to prevent the rotor from coming into contact with the can. As a result, it is possible to prevent the support member from being assembled in a state where the rotation of the rotor is hindered.

In the present invention, the valve seat member has a valve seat member side arc surface arranged on the circumference and a valve seat member side detent surface arranged off the circumference, and the support member. However, it is preferable to have a support member side arc surface in contact with the valve seat member side arc surface and a support member side detent surface in contact with the valve seat member side detent surface. By doing so, the valve seat member and the support member can be accurately positioned. Further, it is possible to regulate that the support member rotates with respect to the valve seat member.

In the present invention, the valve seat member side detent surface is a plane arranged on the chord of the circumference, and the support member side detent surface is a plane in contact with the valve seat member side detent surface. Is preferable. By doing so, it is possible to regulate the rotation of the support member with respect to the valve seat member with a relatively simple shape.

In the present invention, the valve seat member has a plurality of valve seat member side planes arranged on polygonal sides, and the support member is in contact with the plurality of valve seat member side planes. It is preferable to have a flat surface. By doing so, the valve seat member and the support member can be accurately positioned. In addition, it is possible to regulate the rotation of the support member.

In the present invention, the valve seat member is arranged so as to surround the valve opening, has a tubular portion extending in the fitting direction between the valve seat member and the support member, and the support member is the support member. It is preferable to have a tubular guide portion extending in the fitting direction and having an inner peripheral surface in contact with the outer peripheral surface of the tubular portion. By doing so, it is possible to effectively prevent the support member from being fitted at an angle with respect to the valve seat member.

In the present invention, the valve seat member has a valve seat member-side tapered surface inclined with respect to the fitting direction of the valve seat member and the support member, and the support member has the valve seat member with respect to the fitting direction. It is preferable to have a support member-side tapered surface that is inclined and is in contact with the valve seat member-side tapered surface. By doing so, the tapered surface on the valve seat member side and the tapered surface on the support member side come into contact with each other, and the alignment (alignment) between the valve seat member and the support member can be performed autonomously.

In the present invention, the valve seat member side tapered surface is a tapered surface having an annular shape or an arc shape when viewed from the fitting direction, and the support member side tapered surface is the valve seat member side tapered surface. It is preferable that the shape in contact with the surface and viewed from the fitting direction is an annular shape or an arc-shaped tapered surface. By doing so, the tapered surface on the valve seat member side and the tapered surface on the support member side come into contact with each other, and the alignment (alignment) between the valve seat member and the support member can be performed autonomously.

According to the present invention, the positional deviation between the valve opening and the valve body can be effectively suppressed.

It is a vertical sectional view of the electric valve which concerns on one Embodiment of this invention. It is an enlarged sectional view (front view) of the electric valve of FIG. It is an enlarged sectional view (side view) of the electric valve of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a figure which shows the guide stem (support member) of the electric valve of FIG. It is another enlarged sectional view of the electric valve of FIG. It is an enlarged sectional view which shows the structure of the 1st modification of the electric valve of FIG. It is an enlarged sectional view which shows the structure of the 2nd modification of the electric valve of FIG. It is an enlarged sectional view which shows the structure of the 3rd modification of the electric valve of FIG. It is a figure which shows the structure of the guide stem which the electric valve of FIG. 9 has. It is an enlarged sectional view which shows the structure of the 4th modification of the electric valve of FIG.

Hereinafter, the motorized valve according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 is a cross-sectional view (vertical cross-sectional view) along the axis L direction of the motorized valve according to the embodiment of the present invention. 2 and 3 are enlarged cross-sectional views of the valve body of the motorized valve of FIG. 1 and its vicinity thereof. FIG. 2 is a cross-sectional view of the motorized valve as viewed from the front. FIG. 3 is a cross-sectional view of the motorized valve as viewed from the side surface. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. FIG. 5 is a diagram showing a guide stem (support member) of the motorized valve of FIG. FIG. 5A is a front view of the lower part of the guide stem. FIG. 5B is a side view of the lower part of the guide stem. In FIGS. 5A and 5B, the description of the upper part of the guide stem is omitted. FIG. 6 is an enlarged cross-sectional view for explaining the gap between the valve body and the guide stem and the gap between the can and the rotor in the motorized valve of FIG. The black-painted portion (reference numeral W) in FIGS. 2, 3 and 6 indicates a welded portion.

As shown in each figure, the motorized valve 1 includes a valve body 10, a valve seat member 20, a can 30, a valve body 40, a valve shaft 45, a connecting mechanism 50, and a guide stem 60 as a support member. , And a valve body driving unit 70.

The valve body 10 has a cylindrical shape. A valve chamber 14 is provided inside the valve body 10. A metal leaf spring 17 as a holding member is attached to the upper end of the valve body 10. The leaf spring 17 integrally has a frame portion 17a which is an annular disk and a plurality of spring pieces 17b which are continuously provided on the inner peripheral edge of the frame portion 17a. The frame portion 17a is fixed to the inner peripheral edge portion of the upper end surface 10a of the valve body 10 by welding. The spring piece 17b pushes the guide stem 60 downward.

The valve seat member 20 integrally has a tubular portion 21 and a bottom wall portion 22. The tubular portion 21 has a cylindrical shape. The tubular portion 21 extends in the vertical direction (axis L direction). The bottom wall portion 22 is continuously provided at the lower end portion of the tubular portion 21. The bottom wall portion 22 is provided with a valve opening 23 and a valve seat 24. The valve port 23 is a circular hole. The valve port 23 is open to the valve chamber 14. The tubular portion 21 and the valve seat 24 are arranged so as to surround the valve opening 23. The valve seat member 20 is attached to the lower end portion (one end portion) of the valve body 10. Specifically, the valve seat member 20 is fixed to the lower end of the valve body 10 by brazing.

The outer peripheral edge portion of the upper end portion 21k of the tubular portion 21 is cut out in a stepped shape. The upper end portion 21k of the tubular portion 21 is provided with an arc surface 21a on the valve seat member side and a detent surface 21b on the valve seat member side. The arc surface 21a on the valve seat member side is formed along the circumference K (indicated by a two-dot chain line in FIG. 4). The arc surface 21a on the valve seat member side is arranged on the circumference K. The valve seat member side detent surface 21b is a flat surface formed along the chord of the circumference K. The valve seat member side detent surface 21b is arranged on the chord having a circumference K. In other words, the valve seat member side detent surface 21b is arranged away from the circumference K. The circumference K is concentric with the valve port 23 and has a smaller diameter than the outer peripheral surface 21c of the tubular portion 21.

A first conduit 26 is brazed to the valve body 10. The first conduit 26 penetrates the valve body 10 from the side and is connected to the valve chamber 14. A second conduit 27 is brazed to the bottom wall portion 22 of the valve seat member 20. The second conduit 27 is connected to the valve port 23.

The can 30 has a cylindrical shape with the upper end closed. The outer diameter of the can 30 is equal to the outer diameter of the valve body 10. The inner diameter of the can 30 is larger than the inner diameter of the valve body 10. The can 30 is attached to the upper end portion (the other end portion) of the valve body 10. Specifically, the lower end portion of the can 30 is fixed to the outer peripheral edge portion of the upper end surface 10a of the valve body 10 by welding.

The valve body 40 integrally has a body portion 41 and a valve portion 42. The body portion 41 has a cylindrical shape. The valve portion 42 has a conical shape. The valve portion 42 is continuously provided at the lower end portion of the body portion 41. The tip of the valve portion 42 is directed toward the valve seat member 20 side. The valve body 40 opens and closes the valve opening 23. The valve body 40 is arranged in the valve chamber 14 so as to face the valve port 23 in the vertical direction. The vertical direction is the opposite direction between the valve body 40 and the valve port 23. The valve portion 42 is brought into contact with and separated from the valve seat 24. When the valve portion 42 separates from the valve seat 24, the valve opening 23 opens and the valve is opened. In the valve open state, the first conduit 26 and the second conduit 27 are connected via the valve chamber 14. When the valve portion 42 comes into contact with the valve seat 24, the valve opening 23 closes and the valve is closed. In the closed state, the connection between the first conduit 26 and the second conduit 27 is cut off. The valve body 40 is restricted from rotating around the axis L.

The valve shaft 45 has a long cylindrical shape as a whole. The valve shaft 45 has a large diameter portion 46, a small diameter portion 47, and a disk portion 48. A lower stopper body 46a is attached to the lower end portion of the large diameter portion 46. An upper stopper body 46b is attached to the upper end portion of the large diameter portion 46. The lower stopper body 46a and the upper stopper body 46b are rotated and moved together with the valve shaft 45. The large diameter portion 46 is provided with a male screw 46c. The small diameter portion 47 is continuously provided at the upper end portion of the large diameter portion 46. The diameter of the small diameter portion 47 is smaller than the diameter of the large diameter portion 46. The disk portion 48 is continuously provided at the lower end portion of the large diameter portion 46. The diameter of the disk portion 48 is larger than the diameter of the large diameter portion 46.

The connecting mechanism 50 connects the valve body 40 to the lower end portion of the valve shaft 45 (that is, the end portion on the valve seat member 20 side). That is, the valve body 40 is provided at the lower end portion of the valve shaft 45 via the connecting mechanism 50. The connecting mechanism 50 includes a valve holder 51, a spring receiving member 52, and a valve closing spring 53.

The valve holder 51 has a cylindrical shape. The upper wall portion 51a of the valve holder 51 is caulked and fixed to the disk portion 48 of the valve shaft 45. As a result, the valve holder 51 is connected to the valve shaft 45. A disk member 54 is caulked and fixed to the lower end of the valve holder 51. A valve body insertion hole 54a is provided in the center of the disk member 54. A spacer 43, which is an annular disk, is arranged above the disk member 54. The body portion 41 of the valve body 40 is inserted inside the valve body insertion hole 54a and the spacer 43. A sleeve 44 for preventing the sleeve from coming off is fixed to the body portion 41. The disk member 54 supports the valve body 40 so as to be movable in the vertical direction. The inner space of the valve holder 51 is connected to the valve chamber 14 through the pressure equalizing hole 51b.

The spring receiving member 52 has a cylindrical shape. A flange 52a projecting outward in the radial direction is provided at the lower end of the spring receiving member 52. The spring receiving member 52 is arranged inside the valve holder 51 so as to be movable in the vertical direction. The lower surface of the spring receiving member 52 is in contact with the body portion 41 of the valve body 40.

The valve closing spring 53 is a compression coil spring. The valve closing spring 53 is arranged between the upper wall portion 51a of the valve holder 51 and the flange 52a of the spring receiving member 52. The valve closing spring 53 presses the spring receiving member 52 against the body 41 of the valve body 40. The valve closing spring 53 pushes the valve body 40 downward via the spring receiving member 52.

The valve body 40 and the valve shaft 45 may be directly connected without the connection mechanism 50.

The guide stem 60 integrally has a cylindrical portion 61, a cylindrical portion 62, and an annular protrusion 63.

A first stopper portion 61a is provided at the lower end portion of the cylindrical portion 61. A second stopper portion 61b is provided at the upper end portion of the cylindrical portion 61. The columnar portion 61 is provided with a female screw 61c that penetrates in the vertical direction. A male screw 46c of the valve shaft 45 is screwed into the female screw 61c. When the valve shaft 45 rotates around the axis L, the valve shaft 45 moves in the vertical direction due to the screw feed action. The columnar portion 61 supports the valve shaft 45 so as to be movable in the vertical direction. When the valve shaft 45 reaches the upper limit position, the lower stopper body 46a abuts on the first stopper portion 61a, and the upward movement of the valve shaft 45 is restricted. When the valve shaft 45 reaches the lower limit position, the upper stopper body 46b abuts on the second stopper portion 61b, and the downward movement of the valve shaft 45 is restricted.

The cylindrical portion 62 is continuously provided at the lower end portion of the cylindrical portion 61. The inner diameter of the cylindrical portion 62 is equal to the outer diameter of the valve holder 51. A valve body 40 and a connecting mechanism 50 are arranged inside the cylindrical portion 62. The cylindrical portion 62 supports the valve holder 51 so as to be movable in the vertical direction.

At the lower part of the cylindrical portion 62, a support member side arc surface 62a and a support member side detent surface 62b are provided. The arc surface 62a on the support member side is formed along the circumference K. The arc surface 62a on the support member side is arranged on the circumference K. The support member side detent surface 62b is a flat surface formed along the chord of the circumference K. The support member side detent surface 62b is arranged on the chord having a circumference K. In other words, the support member side detent surface 62b is arranged away from the circumference K. Further, a first opening 62c and a second opening 62d are provided in the lower portion of the cylindrical portion 62.

The lower end portion 62k of the cylindrical portion 62 is fitted with the upper end portion 21k of the tubular portion 21 of the valve seat member 20. In the fitted state, the support member side arc surface 62a is in contact with the valve seat member side arc surface 21a, and the support member side detent surface 62b is in contact with the valve seat member side detent surface 21b. The cylindrical portion 62 and the tubular portion 21 are axially aligned with each other by the contact between the arc surface 62a on the support member side and the arc surface 21a on the valve seat member side. The contact between the support member side detent surface 62b and the valve seat member side detent surface 21b restricts the guide stem 60 from rotating about the axis L with respect to the valve seat member 20.

The annular protrusion 63 is provided at the central portion in the vertical direction on the outer peripheral surface 62e of the cylindrical portion 62. The outer diameter of the annular protrusion 63 is larger than the outer diameter of the cylindrical portion 62 and smaller than the inner diameter of the valve body 10. The annular protrusion 63 and the valve body 10 face each other with a gap C1 in the direction orthogonal to the axis L. The upper surface 63a of the annular protrusion 63 is pushed downward by the spring piece 17b of the leaf spring 17. That is, the guide stem 60 is pushed toward the valve seat member 20 by the leaf spring 17. The guide stem 60 is arranged with a gap from the valve body 10, and is fitted only to the valve seat member 20.

The valve body driving unit 70 moves the valve body 40 in the vertical direction. The valve body 40 is brought into contact with and separated from the valve seat 24 by the valve body driving unit 70. The valve body driving unit 70 has a rotor 71 and a stator 72.

The rotor 71 has a cylindrical shape with the upper end closed. The upper wall portion 71a of the rotor 71 is connected to the small diameter portion 47 (that is, the end portion on the can 30 side) of the valve shaft 45 via the connecting body 73. The rotor 71 is rotatably arranged inside the can 30. The rotor 71 and the can 30 face each other with a gap C2 in the direction orthogonal to the axis L. The stator 72 is arranged outside the can 30. The rotor 71 and the stator 72 form a stepping motor.

The gap C2 between the rotor 71 and the can 30 is larger than the gap C1 between the annular protrusion 63 and the valve body 10. Further, the size of the gap C1 and the size of the gap C2 are the sizes of the guide stem 60 before the rotor 71 comes into contact with the can 30 when the inclination of the valve seat member 20 with respect to the valve body 10 is gradually increased. The annular protrusion 63 is set to be in contact with the valve body 10.

In the electric valve 1, the valve body 10, the valve seat member 20 (cylindrical portion 21, valve opening 23, valve seat 24), can 30, valve body 40, valve shaft 45, connecting mechanism 50 (valve holder 51, spring receiving member). 52), the guide stem 60 (cylindrical portion 61, cylindrical portion 62, annular protrusion 63) and the rotor 71 are arranged so that their respective central axes coincide with the axis L.

The valve body 10, the valve seat member 20, the can 30, the valve body 40, and the valve shaft 45 are made of metal such as stainless steel. The guide stem 60 is made of synthetic resin.

Next, an example of the operation of the motorized valve 1 will be described.

In the motorized valve 1, the stator 72 is energized so that the rotor 71 rotates in one direction. The valve shaft 45 rotates together with the rotor 71, and the valve shaft 45 moves downward due to the screw feeding action between the male screw 46c of the valve shaft 45 and the female screw 61c of the guide stem 60. The valve holder 51 moves downward together with the valve shaft 45. As the valve holder 51 moves downward, the valve body 40 moves downward, and the valve body 40 comes into contact with the valve seat 24 to close the valve opening 23 (valve closed state).

In the motorized valve 1, the stator 72 is energized so that the rotor 71 rotates in the other direction. The valve shaft 45 rotates together with the rotor 71, and the valve shaft 45 moves upward due to the screw feeding action between the male screw 46c of the valve shaft 45 and the female screw 61c of the guide stem 60. The valve holder 51 moves upward together with the valve shaft 45. As the valve holder 51 moves upward, the valve body 40 moves upward, and the valve body 40 separates from the valve seat 24 to open the valve opening 23 (valve open state).

In assembling the motorized valve 1, the valve seat member 20 is brazed to the lower end of the valve body 10. The first conduit 26 is brazed to the valve body 10, and the second conduit 27 is brazed to the valve seat member 20. The valve body 40, the valve shaft 45, the connecting mechanism 50 and the rotor 71 are assembled to the guide stem 60. The cylindrical portion 62 of the guide stem 60 is inserted into the valve body 10. The lower end portion 62k of the cylindrical portion 62 and the upper end portion 21k of the tubular portion 21 of the valve seat member 20 are brought close to each other in the L direction of the axis, and these are fitted. The axis L direction is the fitting direction between the valve seat member 20 and the guide stem 60. The leaf spring 17 is welded to the valve body 10 to hold the guide stem 60 between the leaf spring 17 and the valve seat member 20. The can 30 is welded to the valve body 10, and the stator 72 is attached to the can 30, to complete the motorized valve 1.

As described above, the motorized valve 1 includes a valve body 10 having a cylindrical shape, a valve seat member 20 attached to the lower end portion of the valve body 10, and a can 30 attached to the upper end portion of the valve body 10. It has a valve body 40 arranged so as to face the valve port 23 of the valve seat member 20. A valve body 40 is connected to the lower end of the valve shaft 45 of the motorized valve 1 via a connecting mechanism 50. The guide stem 60 supports the valve shaft 45 so as to be movable in the vertical direction. The guide stem 60 is fitted only to the valve seat member 20. Then, the guide stem 60 is pushed toward the valve seat member 20 by the leaf spring 17 attached to the valve body 10.

Therefore, in the motorized valve 1, the guide stem 60 is directly assembled to the valve seat member 20 only, and is held between the valve seat member 20 and the leaf spring 17 attached to the valve body 10. To. Therefore, the motorized valve 1 can reduce the stacking of dimensional tolerances of each member, and can correctly fit the guide stem 60 and the valve seat member 20. Therefore, the motorized valve 1 can effectively suppress the positional deviation between the valve port 23 and the valve body 40.

Further, the motorized valve 1 has a rotor 71 connected to the upper end portion of the valve shaft 45 and a stator 72 arranged outside the can 30. Then, when the inclination of the valve seat member 20 with respect to the valve body 10 is gradually increased, the annular protrusion 63 of the guide stem 60 comes into contact with the valve body 10 before the rotor 71 comes into contact with the can 30. The size of the gap C2 between the rotor 71 and the can 30 and the size of the gap C1 between the guide stem 60 and the valve body 10 are set. When the valve seat member 20 is tilted with respect to the valve body 10, the guide stem 60 is also tilted with respect to the valve body 10, but the guide stem 60 is tilted with its annular protrusion 63 in contact with the valve body 10. It does not tilt beyond. Therefore, it is possible to prevent the rotor 71 from coming into contact with the can 30 by making the annular protrusion 63 of the guide stem 60 come into contact with the valve body 10 before the rotor 71 comes into contact with the can 30. As a result, it is possible to prevent the guide stem 60 from being assembled in a state where the rotation of the rotor 71 is hindered.

Further, the tubular portion 21 of the valve seat member 20 is a valve having a valve seat member-side arc surface 21a arranged on the circumference K concentric with the valve opening 23 and a flat surface arranged on the chord of the circumference K. It has a seat member side detent surface 21b. Then, the cylindrical portion 62 of the guide stem 60 has a support member side arc surface 62a in contact with the valve seat member side arc surface 21a, and a support member side detent surface 62b which is a flat surface in contact with the valve seat member side detent surface 21b. have. By doing so, the valve seat member 20 and the guide stem 60 can be accurately positioned. Further, it is possible to regulate that the guide stem 60 rotates around the axis L with respect to the valve seat member 20. The valve seat member side detent surface 21b and the support member side detent surface 62b may have a shape other than a flat surface, for example, a wavy surface in which convex portions and concave portions are alternately connected.

In the electric valve 1, the tubular portion 21 of the valve seat member 20 has a plurality of valve seat member side planes arranged on the sides of a polygon such as a square or a regular hexagon concentric with the valve opening 23. However, the guide stem 60 may have a plurality of support member side planes in contact with the plurality of valve seat member side planes. By doing so, the valve seat member 20 and the guide stem 60 can be accurately positioned. Further, it is possible to regulate that the guide stem 60 rotates around the axis L with respect to the valve seat member 20.

Next, a modified example of the motorized valve 1 described above will be described with reference to FIGS. 7 to 11. Unless otherwise specified, the components of the modified example having the same reference numerals as the components of the motor-operated valve 1 have the same (including substantially the same) components as the components of the motor-operated valve 1. Have.

FIG. 7 shows an electric valve 1A which is a first modification of the electric valve 1. The motorized valve 1A shown in FIG. 7 has a valve seat member 20A and a guide stem 60A. The motorized valve 1A has the same configuration as the motorized valve 1 described above except for the valve seat member 20A and the guide stem 60A.

The guide stem 60A is provided with a cylindrical guide portion 65A at the lower end portion 62k of the cylindrical portion 62A. The guide portion 65A extends in the vertical direction (axis L direction). Inside the guide portion 65A, the upper end portion 21k of the tubular portion 21A of the valve seat member 20A is fitted. The upper end portion 21k of the tubular portion 21A does not have a stepped notch like the tubular portion 21 of the motorized valve 1 described above. The inner peripheral surface 65a of the guide portion 65A is in contact with the outer peripheral surface 21c of the tubular portion 21A. By doing so, it is possible to effectively prevent the guide stem 60A from being fitted in an inclined manner with respect to the valve seat member 20A.

FIG. 8 shows an electric valve 1B which is a second modification of the electric valve 1. The motorized valve 1B shown in FIG. 8 has a valve seat member 20B and a guide stem 60B. The motorized valve 1B has the same configuration as the motorized valve 1 described above except for the valve seat member 20B and the guide stem 60B.

The guide stem 60B has a cylindrical guide portion 65B at the lower end portion 62k of the cylindrical portion 62B. The guide portion 65B extends in the vertical direction (axis L direction). The inner peripheral surface of the guide portion 65B has a circumferential surface 65c and a support member side tapered surface 65d. The circumferential surface 65c is formed along the vertical direction. The support member side tapered surface 65d is continuously provided at the upper end portion of the circumferential surface 65c. The support member side tapered surface 65d is an inwardly tapered surface having an annular shape when viewed from the vertical direction. The center of the tapered surface 65d on the support member side coincides with the central axis of the guide stem 60B. The tapered surface 65d on the support member side is inclined with respect to the vertical direction, and is formed so that the diameter gradually decreases toward the upper side. Inside the guide portion 65B, the upper end portion 21k of the tubular portion 21B of the valve seat member 20B is fitted. A tapered surface 21d on the valve seat member side is provided on the upper end portion 21k of the tubular portion 21B. The valve seat member side tapered surface 21d is continuously provided at the upper end of the outer peripheral surface 21c of the tubular portion 21B. The valve seat member side tapered surface 21d is an outwardly tapered surface having an annular shape when viewed from the vertical direction. The center of the tapered surface 21d on the valve seat member side coincides with the central axis of the valve seat member 20B. The tapered surface 21d on the valve seat member side is inclined with respect to the vertical direction, and is formed so that the diameter gradually decreases toward the upper side. The tapered surface 21d on the valve seat member side and the tapered surface 65d on the support member side may be formed so that the shape when viewed from the vertical direction is an arc shape.

The circumferential surface 65c of the guide portion 65B is in contact with the outer peripheral surface 21c of the tubular portion 21B. Therefore, it is possible to effectively prevent the guide stem 60B from being fitted at an angle with respect to the valve seat member 20B. Further, the tapered surface 21d on the valve seat member side and the tapered surface 65d on the support member side are in contact with each other. Therefore, the alignment (alignment) between the valve seat member 20B and the guide stem 60B can be autonomously performed.

FIG. 9 shows an electric valve 1C which is a third modification of the electric valve 1. FIG. 10 shows the guide stem 60C included in the motorized valve 1C. FIG. 10A is a view of the lower part of the guide stem 60C as viewed from the front. FIG. 10B is a view of the lower part of the guide stem 60C as viewed from the side surface. In FIGS. 10A and 10B, the description of the upper part of the guide stem 60C is omitted.

The guide stem 60C is provided with rotation restricting walls 66C and 66C on both sides of the first opening 62c of the cylindrical portion 62. The rotation control walls 66C and 66C extend in the vertical direction and are arranged so as to sandwich the first conduit 26 in between. Therefore, the rotation control walls 66C and 66C hit the first conduit 26, and the rotation of the guide stem 60C around the axis L is restricted. In the configuration of this third modification, instead of the valve seat member side arc surface 21a and the valve seat member side detent surface 21b, a valve seat member side circumferential surface arranged on the circumference K is provided, and the support member is provided. Instead of the side arc surface 62a and the support member side detent surface 62b, support member side circumferential surfaces arranged on the circumference K are provided, and these valve seat member side circumferential surfaces and support member side circumferential surfaces are provided. May be configured to touch all around.

FIG. 11 shows an electric valve 1D which is a fourth modification of the electric valve 1. The leaf spring 17D of the motorized valve 1D (specifically, the frame portion 17a which is an annular disk) has the same outer diameter as the outer diameter of the valve body 10 and the outer diameter of the can 30. In the motorized valve 1D, the valve body 10, the can 30, and the leaf spring 17D are fixed by welding. The black-painted portion (reference numeral W) in FIG. 11 indicates a welded portion.

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, 1A, 1B, 1C, 1D ... Electric valve, 10 ... Valve body, 10a ... Upper end surface, 14 ... Valve chamber, 17, 17D ... Leaf spring, 17a ... Frame part, 17b ... Spring piece, 20, 20A, 20B ... Valve seat member, 21, 21A, 21B ... Cylindrical portion, 21a ... Valve seat member side arc surface, 21b ... Valve seat member side detent surface, 21c ... Outer peripheral surface, 21d ... Valve seat member side tapered surface, 21k ... Upper end, 22 ... bottom wall, 23 ... valve opening, 24 ... valve seat, 26 ... first conduit, 27 ... second conduit, 30 ... can, 40 ... valve body, 41 ... body, 42 ... valve, 43 ... Spacer, 44 ... Sleeve, 45 ... Valve shaft, 46 ... Large diameter part, 46a ... Lower stopper body, 46b ... Upper stopper body, 46c ... Male screw, 47 ... Small diameter part, 48 ... Disk part, 50 ... Connecting mechanism , 51 ... valve holder, 51a ... upper wall portion, 51b ... pressure equalizing hole, 52 ... spring receiving member, 52a ... flange, 53 ... valve closing spring, 54 ... disk member, 54a ... valve body insertion hole, 60, 60A , 60B, 60C ... Guide stem, 61 ... Cylindrical part, 61a ... First stopper part, 61b ... Second stopper part, 61c ... Female screw, 62, 62A, 62B ... Cylindrical part, 62a ... Support member side arc surface, 62b ... Support member side detent surface, 62c ... 1st opening, 62d ... 2nd opening, 62e ... outer peripheral surface, 62k ... lower end, 63 ... annular protrusion, 63a ... upper surface, 65A, 65B ... guide part, 65a ... inner circumference Surface, 65c ... Circumferential surface, 65d ... Support member side tapered surface, 66C ... Rotation control wall, 70 ... Valve drive unit, 71 ... Rotor, 71a ... Upper wall part, 72 ... Stator, 73 ... Connecting body, W ... Welding point

Claims (8)

A valve body with a tubular shape and
A valve seat member attached to one end of the valve body,
A can attached to the other end of the valve body,
A valve body arranged so as to face the valve opening of the valve seat member, and
The valve body is provided on the valve seat member side, and the valve shaft
It has a support member that supports the valve shaft so as to be movable in the direction opposite to the valve body and the valve opening.
An electric valve characterized in that the support member is fitted only to the valve seat member and is pushed toward the valve seat member by a pressing member attached to the valve body. A rotor arranged inside the can and connected to the valve shaft,
With a stator disposed on the outside of the can,
The rotor and the can so that the support member comes into contact with the valve body before the rotor comes into contact with the can when the inclination of the valve seat member with respect to the valve body is gradually increased. The electric valve according to claim 1, wherein the size of the gap and the size of the gap between the support member and the valve body are set. The valve seat member has a valve seat member side arc surface arranged on the circumference and a valve seat member side detent surface arranged off the circumference.
1 or claim 1, wherein the support member has a support member side arc surface in contact with the valve seat member side arc surface and a support member side detent surface in contact with the valve seat member side detent surface. Item 2. The electric valve according to Item 2. The valve seat member side detent surface is a flat surface arranged on the chord of the circumference.
The electric valve according to claim 3, wherein the support member side detent surface is a flat surface in contact with the valve seat member side detent surface. The valve seat member has a plurality of valve seat member side planes arranged on the sides of a polygon, and the valve seat member has a plurality of valve seat member side planes.
The electric valve according to claim 1 or 2, wherein the support member has a plurality of support member side planes in contact with the plurality of valve seat member side planes. The valve seat member is arranged so as to surround the valve opening, and has a tubular portion extending in the fitting direction between the valve seat member and the support member.
One of claims 1 to 5, wherein the support member extends in the fitting direction and has a cylindrical guide portion in which an inner peripheral surface is in contact with an outer peripheral surface of the tubular portion. The electric valve described in. The valve seat member has a valve seat member-side tapered surface inclined with respect to the fitting direction of the valve seat member and the support member.
The aspect according to any one of claims 1 to 6, wherein the support member is inclined with respect to the fitting direction and has a support member-side tapered surface in contact with the valve seat member-side tapered surface. Electric valve. The tapered surface on the valve seat member side has an annular shape or an arc shape when viewed from the fitting direction.
The electric valve according to claim 7, wherein the support member side tapered surface is in contact with the valve seat member side tapered surface, and the shape when viewed from the fitting direction is an annular shape or an arc shape tapered surface.

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