WO2020230382A1

WO2020230382A1 - Flow control valve

Info

Publication number: WO2020230382A1
Application number: PCT/JP2020/005112
Authority: WO
Inventors: 良太荒井; 宏気相原
Original assignee: 株式会社不二工機
Priority date: 2019-05-15
Filing date: 2020-02-10
Publication date: 2020-11-19
Also published as: JPWO2020230382A1; JP7106178B2; CN113785148A; CN113785148B

Abstract

Provided is a flow control valve capable of effectively suppressing a force applied to a valve body in a lateral direction. A flow control valve (1) has: a cylindrical housing (11) in which a valve chamber (14) is provided; and a sleeve (20), a lower end section (20a) of which is disposed in the valve chamber (14). The flow control valve (1) has: a valve body (30) that is held by the sleeve (20) so as to be movable in the direction of the axis (L) of the housing (11) and a distal end section (30a) of which is disposed in the valve chamber (14); and a first duct (18) that is disposed so as to penetrate the housing (11). In addition, the lower end section (20a) of the sleeve (20) is disposed between the valve body (30) and the first duct (18).

Description

Flow control valve

The present invention relates to, for example, a flow rate control valve incorporated in a refrigeration cycle and used for controlling the flow rate of a fluid such as a refrigerant.

A conventional flow control valve is disclosed in Patent Document 1. The flow rate control valve of Patent Document 1 includes a valve body, a valve body arranged in the valve body, and an electric motor for moving the valve body.

The valve body has a cylindrical housing with a valve chamber. The housing is attached with a first conduit that penetrates the housing in the lateral direction (direction orthogonal to the axial direction of the housing). The first conduit leads to the valve chamber. A valve seat member is attached to one end of the housing. The valve seat member is provided with a valve opening leading to the valve chamber and a valve seat surrounding the valve opening. A second conduit connected to the valve opening is attached to the valve seat member. A cylindrical holder is attached to the other end of the housing. A sleeve is attached to the inside of the holder. A valve body is inserted inside the sleeve. The valve body and the valve seat are arranged so as to face each other in the axial direction of the housing. The valve body is moved in the axial direction of the housing by an electric motor, and is brought into contact with and separated from the valve seat to open and close the valve opening.

Japanese Unexamined Patent Publication No. 2013-130271

In the flow control valve of Patent Document 1, the valve body and the first conduit are arranged so as to face each other in the lateral direction in the valve chamber. Therefore, a lateral force is generated with respect to the valve body by the fluid flowing through the first conduit. As a result, the valve body may be displaced laterally with respect to the valve seat.

Therefore, an object of the present invention is to provide a flow rate control valve capable of effectively suppressing a force applied in the lateral direction to the valve body.

In order to achieve the above object, the flow control valve of the present invention includes a tubular housing provided with a valve chamber, a sleeve having one end arranged in the valve chamber, and the sleeve in the axial direction of the housing. A flow control valve having a valve body that is movably held and has a tip portion arranged in the valve chamber, and a conduit arranged so as to penetrate the housing, and one end portion of the sleeve is the said. It is characterized in that it is arranged between the valve body and the conduit.

According to the present invention, in the valve chamber provided in the housing, one end of the sleeve is arranged between the valve body and the conduit. Therefore, the amount of the fluid that has flowed into the valve chamber from the conduit hits one end of the sleeve and directly hits the valve body can be reduced. Therefore, the force applied to the valve body by the fluid can be effectively suppressed.

In the present invention, when the valve chamber is viewed from the opening of the conduit, it is preferable that one end of the sleeve occupies an area of 30% or more of the opening and is visually recognized. By doing so, the amount of fluid that directly hits the valve body can be reduced more effectively. Therefore, the force applied to the valve body in the lateral direction can be further suppressed.

In the present invention, it is preferable that the valve seat member is fixed to one end of the housing by a brazing material, and the peripheral edge of the valve seat member forms an annular groove together with the inner peripheral surface of the housing. By doing so, the brazing material can be installed in the annular groove at the time of assembling the flow control valve, and the molten brazing material can be temporarily stored in the annular groove to suppress unnecessary outflow. Therefore, the brazing material can be efficiently flowed between the housing and the valve seat member, and the housing and the valve seat member can be more reliably fixed.

In the present invention, it is preferable that a spiral groove through which the brazing material for fixing the housing and the valve seat member flows is formed on the inner peripheral surface of the housing or the outer peripheral surface of the valve seat member. By doing so, the brazing material flows through the spiral groove and the housing and the valve seat member are fixed in the entire circumferential direction. Therefore, the housing and the valve seat member can be more reliably fixed to each other.

In the present invention, the conduit is fixed to the housing by a brazing material, an annular gap is formed between the inner peripheral surface of the housing and the outer peripheral surface of the valve seat member, and the annular gap is the housing. It is preferable that the brazing material for fixing the pipe to the conduit is formed so as to enter. By doing so, the brazing material that fixes the housing and the conduit enters the annular gap between the housing and the valve seat member and then solidifies to fill the annular gap, and the housing and the valve seat member are separated from each other. It can be fixed more reliably.

In the present invention, it is preferable that the housing is formed so as to be plane-symmetrical in the axial direction. By doing so, it is not necessary to distinguish each end of the housing when assembling the flow control valve, and the assembling property can be improved.

In the present invention, the valve body driving unit has a valve body driving unit that moves the valve body in the axial direction of the housing, and the valve body driving unit includes a cylindrical can, a rotor housed inside the can, and the can. It is preferable to have a stator arranged on the outside of the housing, and the housing and the can are joined by welding. By doing so, the number of welding points can be reduced as compared with a configuration in which the housing is welded to one end of the holder to which the sleeve is attached and the can is welded to the other end, so that the cost required for the welding process can be reduced. Can be reduced. Further, in the present invention, as compared with the above configuration, since the holder is not arranged between the housing and the can, the welded portion can be arranged so as to be farther from the conduit, and therefore, between the valve body and the sleeve. It is possible to suppress the influence of welding heat on the sealing member for sealing and the conduit brazed to the housing. Further, in the present invention, as compared with the above configuration, since the holder does not need to support the housing and the can, the holder can be omitted or the rigidity of the holder can be reduced to reduce the size, and the holder occupies the inside of the housing. The volume can be reduced and the valve chamber volume can be increased accordingly. As a result, the maximum flow rate of the flow rate control valve can be increased.

In the present invention, the housing has a cylindrical main body portion and a cylindrical connecting portion connected to the main body portion and joined by welding to the can, and the thickness of the connecting portion is increased. It is preferable that the thickness is smaller than the thickness of the main body portion and is the same as the thickness of the can, and the outer diameter of the connecting portion is the same as the outer diameter of the can. By doing so, it is possible to reduce the heat capacity of the portion of the housing to be joined by welding while ensuring the rigidity of the housing. Therefore, the amount of heat required for welding can be reduced. Further, since a step portion is formed between the main body portion and the connection portion inside the housing, for example, the holder or sleeve can be easily positioned by bringing the holder or sleeve to which the sleeve is attached into contact with the step portion. can do. Further, in the configuration in which the holder or sleeve is press-fitted into the housing, the amount of press-fitting of the holder or sleeve can be made uniform in a plurality of flow control valves by bringing the holder or sleeve into contact with the step portion.

In the present invention, it is preferable that the holder to which the sleeve is attached or the sleeve is joined by welding at the welded portion between the housing and the can. By doing so, the three members of the housing, the can, and the holder or sleeve can be joined by one welding. Therefore, the holder or sleeve can be easily fixed to the housing and the can, and can be positioned accurately.

In the present invention, at the welded portion between the housing and the can, the holder to which the sleeve is attached is joined by welding, and the sleeve is press-fitted into the holder from the housing side toward the can side. It is preferably attached. By doing so, the three members of the housing, the can, and the holder can be joined by one welding. Therefore, the holder can be easily fixed to the housing and the can, and can be positioned accurately. Further, when the sleeve is press-fitted into the holder from the housing side toward the can side, a force is applied to the sleeve from the housing side toward the can side by the fluid in the valve chamber, so that the sleeve is prevented from falling off from the holder. it can.

According to the present invention, the force applied in the lateral direction to the valve body can be effectively suppressed.

It is sectional drawing of the flow rate control valve which concerns on 1st Example of this invention. It is a side view of the flow rate control valve of FIG. It is an enlarged sectional view of the valve body of the flow control valve of FIG. 1 and the vicinity thereof. It is sectional drawing of the flow rate control valve which concerns on 2nd Example of this invention. It is a figure explaining the assembling method of the flow rate control valve of FIG. It is an enlarged sectional view of the valve body of the flow control valve which concerns on 3rd Example of this invention, and the vicinity thereof. It is an enlarged sectional view of the valve body of the flow control valve which concerns on 4th Embodiment of this invention, and the vicinity thereof. It is an enlarged sectional view of the valve body of the flow control valve which concerns on 5th Embodiment of this invention, and the vicinity thereof. It is an enlarged sectional view of the valve body of the flow control valve which concerns on 6th Embodiment of this invention, and the vicinity thereof.

(First Example)
Hereinafter, the flow rate control valve according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a cross-sectional view (longitudinal cross-sectional view) along the axis L of the flow control valve according to the first embodiment of the present invention. FIG. 2 is a side view of the flow control valve of FIG. 1 as viewed from the axial direction of the first conduit. In FIG. 2, the first conduit is shown in cross section. FIG. 3 is an enlarged cross-sectional view of the valve body of the flow control valve of FIG. 1 and its vicinity.

The flow rate control valve 1 of this embodiment is used as an expansion valve in, for example, a heat pump type heating / cooling system, and is a bidirectional flow type electric valve in which a refrigerant as a fluid flows in both directions.

The flow rate control valve 1 has a valve body 10, a sleeve 20, a valve body 30, and a valve body driving unit 40.

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

The housing 11 is formed in a cylindrical shape having the same diameter over the entire axis L direction (vertical direction in each figure). The housing 11 is provided with a valve chamber 14 inside. The housing 11 is provided with a circular through hole 11a.

The center of the through hole 11a of the housing 11 coincides with the central portion of the housing 11 in the axis L direction (that is, the portion where the distance D1 from the lower end of the housing 11 and the distance D2 from the upper end are equal). In FIG. 3, the alternate long and short dash line with the reference numeral C is a line passing through the center of the through hole 11a and is also an axis line (hereinafter, referred to as “axis line C”) of the first conduit 18 described later. The housing 11 is formed so as to be plane-symmetrical in the L direction of the axis. That is, the housing 11 is plane-symmetric with respect to a plane that passes through the central portion in the axis L direction and is orthogonal to the axis L. Since the housing 11 is formed so as to be plane-symmetrical in the axis L direction, for example, a seamless pipe made of metal such as stainless steel is cut to a predetermined length, and a through hole 11a is cut to provide the housing 11. Can be made. Therefore, as compared with the case where the housing 11 is manufactured by deep drawing press working or the like, it is not necessary to control the wear of the press die, and further, the machining accuracy of the end portion of the housing 11 and the through hole 11a by cutting is not required. Can be easily improved.

The valve seat member 12 is formed in a substantially cylindrical shape. The valve seat member 12 is attached to the housing 11 so as to close the lower end 11b, which is one end of the housing 11. The valve seat member 12 is fixed to the lower end portion 11b of the housing 11 with a brazing material. A cylindrical protrusion 15 is provided on the upper surface of the valve seat member 12. A valve opening 16 that penetrates the valve seat member 12 in the L direction of the axis is provided inside the protrusion 15. An annular valve seat 17 is provided on the upper end surface of the protrusion 15. The valve seat 17 is arranged so as to surround the valve opening 16.

A first conduit 18 extending in the direction orthogonal to the axis L (lateral direction) is attached to the through hole 11a of the housing 11. The first conduit 18 is arranged so as to penetrate the housing 11 in the lateral direction. The valve chamber side end 18a of the first conduit 18 is arranged in the valve chamber 14. The first conduit 18 leads to the valve chamber 14. In this embodiment, the first conduit 18 is fixed to the housing 11 by a brazing material.

A second conduit 19 extending in the L direction of the axis is attached to the valve seat member 12. The second conduit 19 is inserted into the valve opening 16 and leads to the valve chamber 14 via the valve opening 16. In this embodiment, the second conduit 19 is fixed to the valve seat member 12 by a brazing material.

The holder 13 is formed in a cylindrical shape. The lower end of the holder 13 is attached to the upper end 11c, which is the other end of the housing 11. The upper end of the holder 13 is attached to the lower end of the can 41, which will be described later. The holder 13 is fixed to the housing 11 and the can 41 by welding or the like.

The sleeve 20 is formed in a substantially cylindrical shape. The sleeve 20 is attached to the holder 13. The sleeve 20 is fixed to the inside of the holder 13 by press fitting. The press-fitting direction of the sleeve 20 is from the can 41 side to the housing 11 side. The sleeve 20 is arranged so as to be coaxial with the valve seat 17 and to face the valve seat 17 at a distance in the L direction of the axis. A partition wall 21 is provided inside the sleeve 20. The partition wall 21 partitions the space inside the sleeve 20 in the L direction of the axis.

The lower end 20a, which is one end of the sleeve 20, is arranged in the valve chamber 14. The valve body 30 is inserted inside the lower end portion 20a. The lower end portion 20a is a valve body guide portion that guides the movement of the valve body 30 in the axis L direction. The lower end portion 20a is arranged in the valve chamber 14 so as to face the valve chamber side end portion 18a of the first conduit 18 in the lateral direction. As shown in FIG. 2, the lower end portion 20a is arranged so as to be visible when the valve chamber 14 is viewed from the opening 18b of the valve chamber side end portion 18a. In this embodiment, the lower end portion 20a is arranged so as to occupy an area of 50% of the opening 18b of the valve chamber side end portion 18a and be visually recognized. The lower end portion 20a is preferably arranged so as to occupy at least 30% or more of the area of the opening of the valve chamber side end portion 18a so as to be visually recognized, and the larger the ratio, the better. By doing so, a part of the refrigerant flowing through the first conduit 18 hits the lower end portion 20a, and the amount of the refrigerant directly hitting the valve body 30 can be effectively reduced. The flow rate control valve 2 of the second embodiment to the flow rate control valve 6 of the sixth embodiment, which will be described later, have the same configuration.

A bearing member 22 is arranged inside the upper end of the sleeve 20. The bearing member 22 integrally includes a large-diameter portion 23 and a small-diameter portion 24 coaxially connected to the lower end portion of the large-diameter portion 23. The upper end of the large diameter portion 23 is fixed to the sleeve 20. A female screw 24a is provided on the inner peripheral surface of the small diameter portion 24.

The valve body 30 is formed in a cylindrical shape. The outer diameter of the valve body 30 is the same as (including substantially the same) the inner diameter of the lower end portion 20a of the sleeve 20. The valve body 30 is slidably held in the lower end portion 20a of the sleeve 20 in the axis L direction. The tip portion 30a of the valve body 30 is arranged in the valve chamber 14. The tip portion 30a of the valve body 30 faces the valve seat 17 of the valve seat member 12 in the L direction of the axis. The lower end portion 20a of the sleeve 20 is arranged between the valve body 30 and the valve chamber side end portion 18a of the first conduit 18.

An annular plate-shaped pressing member 31 is arranged on the upper end surface 30b of the valve body 30. A groove 30c is formed by the valve body 30 and the pressing member 31. The groove 30c is provided with an annular sealing member 32 made of a rubber material or the like. The sealing member 32 seals the gap between the valve body 30 and the sleeve 20.

The valve body driving unit 40 moves the valve body 30 in the L direction of the axis. As a result, the tip portion 30a of the valve body 30 comes into contact with and separates from the valve seat 17 to open and close the valve opening 16. The valve body drive unit 40 includes a can 41, a stator 42, a rotor 43, a planetary gear mechanism 50, and an elevating drive unit 60.

The can 41 is formed in a cylindrical shape having a peripheral wall portion 41a and a ceiling portion 41b. The stator 42 is attached to the outside of the can 41. The rotor 43 is rotatably arranged inside the can 41. An electric motor is composed of a stator 42 and a rotor 43.

The planetary gear mechanism 50 is arranged inside the rotor 43. The planetary gear mechanism 50 slows down the rotation of the rotor 43. The planetary gear mechanism 50 includes a sun gear 51, a fixed ring gear 52, a plurality of planetary gears 53, a carrier 54, an output gear 55, an output shaft 56, and a gear case 57. The sun gear 51 is integrally provided on the rotor support member 45 attached to the rotor shaft 44. The rotor shaft 44 is rotatably supported by the bearing member 46. The fixed ring gear 52 is an internal gear fixed to the upper end of the gear case 57. The plurality of planetary gears 53 are arranged between the sun gear 51 and the fixed ring gear 52 and mesh with each other. The carrier 54 rotatably supports the planetary gear 53. The output gear 55 is an internal gear that is formed in a bottomed tubular shape and meshes with the planetary gear 53 from the outside. The output shaft 56 is fixed to the bottom of the output gear 55 by press fitting or the like. The gear case 57 is formed in a cylindrical shape and is fixed to the upper end of the sleeve 20 by welding or the like.

The elevating drive unit 60 has a spring receiving body 61, a valve opening spring 62, a thrust transmission member 63, an elevating shaft 64, a ball 67, and a ball receiving seat 68.

The spring receiver 61 is provided at the cylindrical portion 61a, the upper end portion of the cylindrical portion 61a, and is provided at the upper end side hooking portion 61b protruding outward and the lower end portion side of the cylindrical portion 61a protruding inward. It has a hook portion 61c and a hook portion 61c. The spring receiver 61 is housed in a spring chamber 28 provided between the partition wall 21 of the sleeve 20 and the bearing member 22. A small diameter portion 24 of the bearing member 22 is inserted into the cylindrical portion 61a. The spring receiver 61 can move in the L direction along the axis with respect to the bearing member 22.

The valve opening spring 62 is a spiral coil spring. The valve opening spring 62 is sandwiched in a compressed state between the partition wall 21 of the sleeve 20 and the hook portion 61b on the upper end side of the spring receiver 61 in the spring chamber 28. As a result, the valve opening spring 62 applies a force that pushes it upward with respect to the spring receiver 61.

The thrust transmission member 63 integrally has a large-diameter portion 63a, a medium-diameter portion 63b, and a small-diameter portion 63c, which are connected in order from top to bottom. The large diameter portion 63a is hooked on the lower end side hook portion 61c of the spring receiver 61. A ball receiving seat 68 is attached to the inside of the large diameter portion 63a. The medium diameter portion 63b is inserted through a through hole 21a provided in the partition wall 21 of the sleeve 20. The small diameter portion 63c is fixed to the hole portion 30d opened in the upper end surface 30b of the valve body 30 by press fitting or the like. The pressing member 31 is pressed against the valve body 30 by the step portion between the medium diameter portion 63b and the small diameter portion 63c.

The elevating shaft 64 is made of metal such as stainless steel, and integrally has a columnar portion 65 and a flat plate portion 66 connected to the upper end portion of the columnar portion 65. A male screw 65a is provided on the outer peripheral surface of the cylindrical portion 65. The male screw 65a is screwed into the female screw 24a of the bearing member 22. The flat plate portion 66 is movably inserted in the slit 56a provided on the output shaft 56 of the planetary gear mechanism 50 in the axis L direction. The elevating shaft 64 is rotated along with the rotation of the output shaft 56, and moves in the axis L direction by the screw feeding action. A ball 67, a ball receiving seat 68, and a thrust transmitting member 63 are arranged between the elevating shaft 64 and the valve body 30. As the elevating shaft 64 moves toward the valve seat member 12, the valve body 30 approaches the valve seat 17.

In this embodiment, the axis of the housing 11, the valve port 16 of the valve seat member 12, the valve seat 17, the sleeve 20, the bearing member 22, the valve body 30, the rotor shaft 44, the output shaft 56, and the elevating shaft 64, respectively. Corresponds to the axis L. In other words, they are all placed coaxially.

Next, an example of the operation of the flow control valve 1 of this embodiment will be described.

In the flow control 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 increased by the planetary gear mechanism 50 and transmitted from the output shaft 56 to the elevating shaft 64. The elevating shaft 64 moves in the axis L direction (vertical direction) according to the rotation direction due to the screw feeding action with the bearing member 22.

When the elevating shaft 64 moves downward, the thrust transmission member 63 is pushed downward, and the valve body 30 moves downward together with the thrust transmission member 63. Then, the tip portion 30a of the valve body 30 comes into contact with the valve seat 17 and the valve opening 16 is closed (valve closed state).

When the elevating shaft 64 moves upward in the valve closed state, the valve opening spring 62 in the compressed state is restored and the spring receiver 61 is pushed upward. Then, the thrust transmission member 63 is pulled upward by the lower end side hooking portion 61c of the spring receiver 61, and the valve body 30 moves upward together with the thrust transmission member 63. As a result, the tip portion 30a of the valve body 30 is separated from the valve seat 17 and the valve opening 16 is opened (valve open state).

In the valve open state, for example, when the refrigerant flows from the first conduit 18 into the valve chamber 14, a part of the refrigerant flowing through the first conduit 18 hits the lower end portion 20a of the sleeve 20, and the remaining part of the refrigerant is the valve body 30. It corresponds to the portion protruding from the sleeve 20 of the. Therefore, the amount of the refrigerant that directly hits the valve body 30 can be reduced. Similarly, when the refrigerant flows from the valve chamber 14 to the first conduit 18, the amount of the refrigerant acting directly on the valve body 30 can be reduced.

From the above, according to the flow rate control valve 1 of the present embodiment, in the valve chamber 14 provided in the housing 11, the lower end portion 20a of the sleeve 20 is arranged between the valve body 30 and the first conduit 18. .. As a result, the amount of the refrigerant that has flowed from the first conduit 18 into the valve chamber 14 hits the lower end portion 20a of the sleeve 20 and directly hits the valve body 30 can be reduced. Therefore, the force applied to the valve body 30 by the refrigerant can be effectively suppressed.

Further, when the valve chamber 14 is viewed from the opening 18b of the first conduit 18, the flow control valve 1 is visually recognized with the lower end portion 20a of the sleeve 20 occupying an area of 50% of the opening 18b. By doing so, the amount of the refrigerant that directly hits the valve body 30 can be reduced more effectively. Therefore, the force applied to the valve body 30 in the lateral direction can be further suppressed.

Further, the flow rate control valve 1 is formed so that the housing 11 is plane-symmetrical in the axis L direction. By doing so, it is not necessary to distinguish between the lower end portion 11b and the upper end portion 11c of the housing 11 when assembling the flow control valve 1, and the assembling property can be improved.

(Second Example)
Hereinafter, the flow rate control valve according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5.

FIG. 4 is a cross-sectional view (vertical cross-sectional view) along the axis L of the flow control valve according to the second embodiment of the present invention. FIG. 5 is a view for explaining the method of assembling the flow control valve of FIG. 4, and is an enlarged cross-sectional view of the lower end portion of the housing and its vicinity. In FIG. 5, the lower end of the housing is arranged facing upward. In the following description, the same components as those of the flow control valve 1 of the first embodiment described above (including substantially the same components) are designated by the same reference numerals, and the description thereof will be omitted.

The flow rate control valve 2 according to the second embodiment has a valve body 10A having a housing 11A, a valve seat member 12A, and a holder 13 instead of the valve body 10 described above. The flow rate control valve 2 has the same (including substantially the same) configuration as the flow rate control valve 1 according to the first embodiment described above, except for the valve body 10A.

The housing 11A has a cylindrical main body portion 70 and a cylindrical valve seat member mounting portion 71 connected to the lower end portion of the main body portion 70. The outer diameter of the main body portion 70 is the same as the outer diameter of the peripheral wall portion 41a of the can 41. The inner diameter of the main body portion 70 is smaller than the inner diameter of the peripheral wall portion 41a of the can 41. That is, the thickness of the main body portion 70 is larger than the thickness of the peripheral wall portion 41a of the can 41. The outer diameter of the valve seat member mounting portion 71 is the same as the outer diameter of the main body portion 70. The inner diameter of the valve seat member mounting portion 71 is larger than the inner diameter of the main body portion 70. That is, the housing 11A is provided with a valve seat member mounting portion 71, which is an enlarged diameter portion having an inner diameter wider than that of other portions, at the lower end portion 11b. A step portion 11e is provided between the inner peripheral surface 70a of the main body portion 70 of the housing 11A and the inner peripheral surface 71a of the valve seat member mounting portion 71.

The upper surface 12a of the valve seat member 12A is arranged close to the first conduit 18. As shown in FIG. 5, the valve seat member 12A is provided with an annular protrusion 72 that protrudes outward in the radial direction from the outer peripheral surface 12b. The outer diameter of the annular protrusion 72 and the inner diameter of the valve seat member mounting portion 71 are the same. A spiral groove 73 is formed on the outer peripheral surface 72a of the annular protrusion 72. The spiral groove 73 may be formed on the inner peripheral surface 71a of the valve seat member mounting portion 71.

An annular gap 74 is provided between the inner peripheral surface 70a of the main body portion 70 of the housing 11A and the outer peripheral surface 12b of the valve seat member 12A.

Next, an example of an assembly method of the flow rate control valve 2 will be described with reference to FIG.

First, assemble the valve body 10A. Specifically, the lower end portion 11b of the housing 11A is arranged so as to face upward. The valve seat member 12A is fitted inside the lower end 11b so as to close the lower end 11b of the housing 11A. At this time, the inner peripheral surface 71a of the valve seat member mounting portion 71 of the housing 11A and the outer peripheral surface 72a of the annular protrusion 72 are in contact with each other, and the step portion 11e of the housing 11A and one end surface 72b of the annular protrusion 72. Is in contact. Further, an annular gap 74 is formed between the inner peripheral surface 70a of the main body portion 70 and the outer peripheral surface 12b of the valve seat member 12A. The other end surface 72c of the annular protrusion 72 is below the end surface 11f of the lower end portion 11b of the housing 11A. An annular groove 75 is formed by the outer peripheral surface 12b of the valve seat member 12A, the other end surface 72c of the annular protrusion 72, and the inner peripheral surface 71a of the valve seat member mounting portion 71 of the housing 11A. That is, the outer peripheral surface 12b and the other end surface 72c, which are the peripheral edges of the end portion of the valve seat member 12A exposed to the outside of the housing 11A, are annular grooves together with the inner peripheral surface 71a of the valve seat member mounting portion 71 of the housing 11A. Forming 75. One end of the spiral groove 73 is open in the annular groove 75. The first conduit 18 is inserted into the through hole 11a of the housing 11A. The second conduit 19 is inserted into the valve opening 16 of the valve seat member 12A.

Then, the brazing material S1 is installed in the annular groove 75. The brazing material S2 is installed in the vicinity of the through hole 11a. The brazing filler metal S3 is installed near the opening on the outside of the valve opening 16. Then, the assembly in which the housing 11A, the valve seat member 12A, the first conduit 18, and the second conduit 19 are assembled is put into the furnace.

In the furnace, the molten brazing material S1 temporarily accumulates in the annular groove 75 and gradually flows downward along the spiral groove 73. The molten brazing material S2 enters between the through hole 11a of the housing 11A and the first conduit 18, and further enters the annular gap 74 by a capillary phenomenon. The molten brazing material S3 enters between the valve port 16 and the second conduit 19. Then, the assembly is taken out of the furnace, the brazing members S1, S2, and S3 are solidified, the housing 11A and the valve seat member 12A are fixed, the housing 11A and the first conduit 18 are fixed, and the valve seat member 12A is fixed. The second conduit 19 is fixed.

Next, assemble the valve body drive unit 40. The holder 13 into which the sleeve 20 is press-fitted is fixed to the lower end of the can 41 by welding. Then, the valve body 30 is inserted into the lower end portion 20a of the sleeve 20, and the valve body 30 is attached to the valve body driving unit 40. Then, the holder 13 is fixed to the upper end portion 11c of the housing 11A by welding. In this way, the flow control valve 2 is completed.

The flow rate control valve 2 of this embodiment has the same effect as the flow rate control valve 1 of the first embodiment described above.

Further, in the flow control valve 2, the valve seat member 12A is fixed to the lower end portion 11b of the housing 11A by the brazing material S1. The outer peripheral surface 12b and the end surface 72c, which are the peripheral edges of the valve seat member 12A, form an annular groove 75 together with the inner peripheral surface 71a of the valve seat member mounting portion 71 of the housing 11A. By doing so, the brazing filler metal S1 can be installed in the annular groove 75 at the time of assembling the flow control valve 2, and the molten brazing filler metal S1 can be temporarily accumulated in the annular groove 75 to suppress unnecessary outflow. .. Therefore, the brazing material S1 can be efficiently flowed between the housing 11A and the valve seat member 12A, and the housing 11A and the valve seat member 12A can be more reliably fixed to each other.

Further, in the flow control valve 2, a spiral groove 73 through which the brazing material S1 for fixing the housing 11A and the valve seat member 12A flows is formed on the outer peripheral surface 72a of the annular protrusion 72 of the valve seat member 12A. By doing so, the brazing material S1 flows through the spiral groove 73, and the housing 11A and the valve seat member 12A are fixed over the entire circumferential direction. Therefore, the housing 11A and the valve seat member 12A can be more reliably fixed to each other.

Further, in the flow control valve 2, the first conduit 18 is fixed to the housing 11A by the brazing material S2. An annular gap 74 is formed between the inner peripheral surface 70a of the main body portion 70 of the housing 11A and the outer peripheral surface 12b of the valve seat member 12A. The annular gap 74 is formed so that the brazing material S2 that fixes the housing 11A and the first conduit 18 enters. By doing so, the brazing material S2 for fixing the housing 11A and the first conduit 18 enters the annular gap 74 between the housing 11A and the valve seat member 12A and then solidifies to close the annular gap 74. fill in. Therefore, the housing 11A and the valve seat member 12A can be more reliably fixed to each other.

(Third Example)
Hereinafter, the flow rate control valve according to the third embodiment of the present invention will be described with reference to FIG.

FIG. 6 is an enlarged cross-sectional view of the valve body of the flow control valve according to the third embodiment of the present invention and its vicinity. In the following description, the same components as those of the flow control valve 2 of the second embodiment described above (including substantially the same components) are designated by the same reference numerals, and the description thereof will be omitted.

The flow rate control valve 3 according to the third embodiment has a valve body 10B having a housing 11B, a valve seat member 12A, and a holder 13B, instead of the valve body 10A described above. The flow rate control valve 3 has the same (including substantially the same) configuration as the flow rate control valve 2 according to the second embodiment described above, except for the valve body 10B.

The housing 11B has a main body portion 70, a valve seat member mounting portion 71, and a cylindrical connecting portion 76 connected to the upper end portion of the main body portion 70. The outer diameter of the connecting portion 76 is the same as the outer diameter of the main body portion 70 and the outer diameter of the peripheral wall portion 41a of the can 41. The inner diameter of the connecting portion 76 is larger than the inner diameter of the main body portion 70 and is the same as the inner diameter of the peripheral wall portion 41a of the can 41. That is, the housing 11B is provided with a connecting portion 76 at the upper end portion 11c, which is smaller than the thickness of the main body portion 70 and has the same thickness as the peripheral wall portion 41a of the can 41. A step portion 11g is provided between the inner peripheral surface 70a of the main body portion 70 and the inner peripheral surface 76a of the connecting portion 76.

The holder 13B is formed in a cylindrical shape. The holder 13B has a first portion 81 whose outer diameter is the same as the inner diameter of the connecting portion 76 of the housing 11B, and a second portion 82 whose outer diameter is the same as the inner diameter of the main body portion 70 of the housing 11B. The first portion 81 and the second portion 82 are continuously provided in the L direction of the axis. A sleeve 20 is fixed to the inside of the holder 13B by press fitting. The press-fitting direction of the sleeve 20 is from the can 41 side to the housing 11B side.

The first portion 81 of the holder 13B is in contact with the peripheral wall portion 41a of the can 41 and the connecting portion 76 of the housing 11B. Then, the peripheral wall portion 41a of the can 41, the connecting portion 76 of the housing 11B, and the first portion 81 of the holder 13B are joined by welding at the welding portion 90 over the entire circumferential direction.

In this embodiment, the holder 13B is arranged inside the housing 11B and the can 41, and the housing 11B and the can 41 are directly joined by welding. As a result, the flow control valve 3 is arranged so that the welded portion 90 is farther away from the first conduit 18 than the flow control valve 2 of the second embodiment, and the welded portion 90 and the first conduit 18 are arranged. The distance is increasing. Therefore, as is clear from the formula (1) for obtaining heat transfer of the metal shown below, the heat of welding transferred from the welded portion 90 to the first conduit 18 and the like becomes smaller as the distance increases. The same applies to the flow rate control valves 4 to the sixth embodiment, which will be described later.

The heat transfer of the metal can be obtained by using the following formula (1).
Q = ((k · A) / L) · (T A -T B) ··· (1)
However, Q is heat transferred, k is the thermal conductivity of the object, A is the cross-sectional area, L is the heat transfer distance, T _A is the heat input side temperature, T _B is the heat transfer side The temperature.

The flow rate control valve 3 of this embodiment has the same effect as the flow rate control valve 2 of the second embodiment described above.

Further, the flow rate control valve 3 has a valve body driving unit 40 that moves the valve body 30 in the axial direction of the housing 11B. The valve body driving unit 40 has a cylindrical can 41, a rotor 43 housed inside the can 41, and a stator 42 arranged outside the can 41. Then, the housing 11B and the can 41 are joined by welding. By doing so, for example, as in the flow control valve 2 of the second embodiment, the housing 11A is welded to one end of the holder 13 to which the sleeve 20 is attached, and the can 41 is welded to the other end. In comparison, the number of welding points can be reduced, so that the cost required for the welding process can be reduced. Further, as compared with the above configuration, the flow control valve 3 can be arranged so that the welded portion 90 is farther away from the first conduit 18 because the holder 13B is not arranged between the housing 11B and the can 41. Therefore, the influence of welding heat on the first conduit 18 brazed to the housing 11B, the sealing member 32 that seals between the valve body 30 and the sleeve 20, and the like can be suppressed. Further, in the flow control valve 3, since the holder 13B does not need to support the housing 11B and the can 41 as compared with the above configuration, the rigidity of the holder 13B can be reduced and the size can be reduced, and the holder 13B can be made smaller in the housing. The volume occupied can be reduced, and the volume of the valve chamber 14 can be increased accordingly. As a result, the maximum flow rate of the flow rate control valve 3 can be increased.

Further, the flow rate control valve 3 has a housing 11B having a cylindrical main body portion 70 and a cylindrical connecting portion 76 connected to the main body portion 70 by welding and connected to the can 41. The thickness of the connecting portion 76 is smaller than the thickness of the main body portion 70 and is the same as the thickness of the can 41. The outer diameter of the connecting portion 76 is the same as the outer diameter of the can 41. By doing so, the heat capacity of the connecting portion 76 joined by welding to the can 41 in the housing 11B can be reduced. Therefore, the amount of heat required for welding can be reduced. Further, since the step portion 11g is provided between the inner peripheral surface 70a of the main body portion 70 and the inner peripheral surface 76a of the connecting portion 76, the first portion 81 of the holder 13B is brought into contact with the step portion 11g. Therefore, the holder 13B can be easily positioned. Further, in the configuration in which the holder 13B is press-fitted into the housing 11B, the press-fitting amount of the holder 13B can be made uniform in the plurality of flow control valves 3 by bringing the first portion 81 of the holder 13B into contact with the step portion 11g.

Further, in the flow control valve 3, the holder 13B is joined by welding at the welding point 90 between the housing 11B and the can 41. By doing so, the three members of the housing 11B, the can 41, and the holder 13B can be joined by one welding. Therefore, the holder 13B can be easily fixed to the housing 11B and the can 41, and the holder 13B can be brought into contact with the housing 11B and the can 41 for accurate positioning.

(Fourth Example)
Hereinafter, the flow rate control valve according to the fourth embodiment of the present invention will be described with reference to FIG. 7.

FIG. 7 is an enlarged cross-sectional view of the valve body of the flow control valve according to the fourth embodiment of the present invention and its vicinity. In the following description, the same components as those of the flow control valve 3 of the third embodiment described above (including substantially the same components) are designated by the same reference numerals, and the description thereof will be omitted.

The flow control valve 4 according to the fourth embodiment has a housing 11B, a valve seat member 12A, and a valve body 10C having no holder, instead of the valve body 10B described above. Further, the flow rate control valve 4 has a sleeve 20C instead of the sleeve 20 described above. The flow rate control valve 4 has the same (including substantially the same) configuration as the flow rate control valve 3 according to the third embodiment described above, except for the valve body 10C and the sleeve 20C.

The sleeve 20C is formed in a substantially cylindrical shape. The sleeve 20C has a first portion 83 whose outer diameter is the same as the inner diameter of the connecting portion 76 of the housing 11B, and a second portion 84 whose outer diameter is the same as the inner diameter of the main body portion 70 of the housing 11B. The first portion 83 and the second portion 84 are continuously provided in the L direction of the axis. The sleeve 20C has the same configuration as the sleeve 20 described above, except that it has a first portion 83 and a second portion 84.

The first portion 83 of the sleeve 20C is in contact with the peripheral wall portion 41a of the can 41 and the connecting portion 76 of the housing 11B. Then, the peripheral wall portion 41a of the can 41, the connecting portion 76 of the housing 11B, and the first portion 83 of the sleeve 20C are joined by welding at the welding portion 90 over the entire circumferential direction.

The flow rate control valve 4 of this embodiment has the same effect as the flow rate control valve 3 of the third embodiment described above.

Further, the flow control valve 4 has a housing 11B having a cylindrical main body portion 70 and a cylindrical connecting portion 76 connected to the main body portion 70 and joined by welding to the can 41. The thickness of the connecting portion 76 is smaller than the thickness of the main body portion 70 and is the same as the thickness of the can 41. The outer diameter of the connecting portion 76 is the same as the outer diameter of the can 41. By doing so, the heat capacity of the connecting portion 76 joined by welding to the can 41 in the housing 11B can be reduced. Therefore, the amount of heat required for welding can be reduced. Further, since the step portion 11g is provided between the inner peripheral surface 70a of the main body portion 70 and the inner peripheral surface 76a of the connecting portion 76, the first portion 83 of the sleeve 20C is brought into contact with the step portion 11g. Therefore, the sleeve 20C can be easily positioned. Further, in the configuration in which the sleeve 20C is press-fitted into the housing 11B, the press-fitting amount of the sleeve 20C can be made uniform in the plurality of flow control valves 4 by bringing the first portion 83 of the sleeve 20C into contact with the step portion 11g.

Further, in the flow control valve 4, the sleeve 20C is joined by welding at the welding point 90 between the housing 11B and the can 41. By doing so, the three members of the housing 11B, the can 41, and the sleeve 20C can be joined by one welding. Therefore, the sleeve 20C can be easily fixed to the housing 11B and the can 41, and the sleeve 20C can be brought into contact with the housing 11B and the can 41 for accurate positioning.

(Fifth Example)
Hereinafter, the flow rate control valve according to the fifth embodiment of the present invention will be described with reference to FIG.

FIG. 8 is an enlarged cross-sectional view of the valve body of the flow control valve according to the fifth embodiment of the present invention and its vicinity. In the following description, the same components as those of the flow control valve 2 of the second embodiment described above (including substantially the same components) are designated by the same reference numerals, and the description thereof will be omitted.

The flow rate control valve 5 according to the fifth embodiment has a valve body 10D having a housing 11A, a valve seat member 12A, and a holder 13D, instead of the valve body 10A described above. The flow rate control valve 5 has the same (including substantially the same) configuration as the flow rate control valve 2 according to the second embodiment described above, except for the valve body 10D.

The holder 13D is formed in a cylindrical shape. The holder 13D has a first portion 85 whose outer diameter is the same as the inner diameter of the peripheral wall portion 41a of the can 41, and a second portion 86 whose outer diameter is the same as the inner diameter of the main body portion 70 of the housing 11A. A sleeve 20 is fixed to the inside of the holder 13D by press fitting. The press-fitting direction of the sleeve 20 is from the housing 11A side to the can 41 side.

The first portion 85 of the holder 13D is in contact with the peripheral wall portion 41a of the can 41. The second portion 86 of the holder 13D is in contact with the main body portion 70 of the housing 11A. The peripheral wall portion 41a of the can 41, the main body portion 70 of the housing 11A, and the first portion 85 of the holder 13D are joined by welding at the welding portion 90 over the entire circumferential direction.

The flow rate control valve 5 of this embodiment has the same effect as the flow rate control valve 3 of the third embodiment described above.

Further, the flow control valve 5 can easily position the holder 13D by bringing the first portion 85 of the holder 13D into contact with the end surface of the upper end portion 11c of the housing 11A. Further, in the configuration in which the holder 13D is press-fitted into the housing 11A, the first portion 85 of the holder 13D is brought into contact with the end surface of the upper end portion 11c of the housing 11A, so that the press-fitting amount of the holder 13D is increased in the plurality of flow control valves 5. Can be made uniform.

Further, in the flow control valve 5, the holder 13D is joined by welding at the welding point 90 between the housing 11A and the can 41. Then, the sleeve 20 is attached to the holder 13D by being press-fitted from the housing 11A side toward the can 41 side. By doing so, the three members of the housing 11A, the can 41, and the holder 13D can be joined by one welding. Therefore, the holder 13D can be easily fixed to the housing 11A and the can 41, and can be positioned accurately. Further, when the sleeve 20 is press-fitted into the holder 13D from the housing 11A side toward the can 41 side, a force is applied to the sleeve 20 from the housing 11A side toward the can 41 side by the refrigerant in the valve chamber 14, so that the sleeve 20 It is possible to prevent 20 from falling off from the holder 13D.

(6th Example)
Hereinafter, the flow rate control valve according to the sixth embodiment of the present invention will be described with reference to FIG.

FIG. 9 is an enlarged cross-sectional view of the valve body of the flow control valve according to the sixth embodiment of the present invention and its vicinity. In the following description, the same components as those of the flow control valve 3 of the third embodiment described above (including substantially the same components) are designated by the same reference numerals, and the description thereof will be omitted.

The flow rate control valve 6 according to the sixth embodiment has a valve body 10E having a housing 11B, a valve seat member 12A, and a holder 13E, instead of the valve body 10B described above. The flow rate control valve 6 has the same (including substantially the same) configuration as the flow rate control valve 3 according to the third embodiment described above, except for the valve body 10E.

The holder 13E is formed in a ring plate shape. The outer diameter of the holder 13E is the same as the inner diameter of the peripheral wall portion 41a of the can 41 and the connecting portion 76 of the housing 11B. A sleeve 20 is arranged inside the holder 13E. The holder 13E and the sleeve 20 are joined by welding.

The holder 13E is in contact with the peripheral wall portion 41a of the can 41 and the connecting portion 76 of the housing 11B. Then, the peripheral wall portion 41a of the can 41, the connecting portion 76 of the housing 11B, and the holder 13E are joined by welding at the welding portion 90 over the entire circumferential direction.

The flow rate control valve 6 of this embodiment has the same effect as the flow rate control valve 3 of the third embodiment described above.

Further, in the flow control valve 6, the sleeve 20 can be fixed to the housing 11B by the holder 13E having a relatively simple structure.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. The present invention also includes those having components added, deleted, and design changes as appropriate to the above-described embodiments, and those in which the features of the embodiments are appropriately combined, unless contrary to the gist of the present invention. Is included in the range of.

(First Example)
1 ... Flow control valve, 10 ... Valve body, 11 ... Housing, 11a ... Through hole, 11b ... Lower end, 11c ... Upper end, 12 ... Valve seat member, 13 ... Holder, 14 ... Valve chamber, 15 ... Protrusion, 16 ... Valve port, 17 ... Valve seat, 18 ... First conduit, 18a ... Valve chamber side end, 19 ... Second conduit, 20 ... Sleeve, 21 ... Partition, 22 ... Bearing member, 23 ... Large diameter part, 24 ... Small diameter part, 24a ... Female screw, 28 ... Spring chamber, 30 ... Valve body, 30a ... Tip part, 30b ... Upper end surface, 30c ... Groove part, 31 ... Holding member, 32 ... Sealing member, 40 ... Valve body driving part, 41 ... Can, 41a ... Peripheral wall, 41b ... Ceiling, 42 ... Stator, 43 ... Rotor, 44 ... Rotor shaft, 45 ... Rotor support member, 46 ... Bearing member, 50 ... Planetary gear mechanism, 51 ... Sun gear, 52 ... Fixed ring gear, 53 ... Planetary gear, 54 ... Carrier, 55 ... Output gear, 56 ... Output shaft, 56a ... Slit, 57 ... Gear case, 60 ... Lifting drive unit, 61 ... Spring receiver, 61a ... Cylindrical part, 61b ... Upper end side hooking part, 61c ... Lower end side hooking part, 62 ... Valve opening spring, 63 ... Thrust transmission member, 63a ... Large diameter part, 63b ... Medium diameter part, 63c ... Small diameter part, 64 ... Elevating shaft, 65 ... Cylindrical part, 65a ... Male screw, 66 ... Flat plate part, 67 ... Ball, 68 ... Ball bearing, L ... Housing axis, C ... First conduit axis (2nd embodiment)
2 ... Flow control valve, 10A ... Valve body, 11A ... Housing, 11e ... Step, 11f ... End face, 12A ... Valve seat member, 12a ... Top surface, 12b ... Outer surface, 70 ... Main body, 70a ... Inner circumference, 71 ... valve seat member mounting portion, 71a ... inner peripheral surface, 72 ... annular protrusion, 72a ... outer peripheral surface, 72b ... one end surface, 72c ... other end surface, 73 ... spiral groove, 74 ... annular gap, 75 ... Circumferential groove, S1, S2, S3 ... Brazing material (third embodiment)
3 ... Flow control valve, 10B ... Valve body, 11B ... Housing, 11g ... Step, 12A ... Valve seat member, 13B ... Holder, 70 ... Main body part, 70a ... Inner peripheral surface, 71 ... Valve seat member mounting part, 76 ... connection part, 76a ... inner peripheral surface, 81 ... first part, 82 ... second part, 90 ... welded part (fourth embodiment)
4 ... Flow control valve, 10C ... Valve body, 11B ... Housing, 11g ... Step, 12A ... Valve seat member, 20C ... Sleeve, 70 ... Main body part, 70a ... Inner peripheral surface, 71 ... Valve seat member mounting part, 76 ... connection part, 76a ... inner peripheral surface, 83 ... first part, 84 ... second part, 90 ... welded part (fifth embodiment)
5 ... Flow control valve, 10D ... Valve body, 11A ... Housing, 12A ... Valve seat member, 13D ... Holder, 70 ... Main body part, 70a ... Inner peripheral surface, 71 ... Valve seat member mounting part, 85 ... First part, 86 ... 2nd part, 90 ... Welded part (6th example)
6 ... Flow control valve, 10E ... Valve body, 11B ... Housing, 11g ... Step, 12A ... Valve seat member, 13E ... Holder, 70 ... Main body part, 70a ... Inner peripheral surface, 71 ... Valve seat member mounting part, 76 ... Connection part, 76a ... Inner peripheral surface, 90 ... Welded part

Claims

A tubular housing provided with a valve chamber, a sleeve having one end arranged in the valve chamber, and a sleeve held in the sleeve so as to be movable in the axial direction of the housing and a tip portion arranged in the valve chamber. A flow control valve having a valve body and a conduit arranged through the housing.
A flow control valve characterized in that one end of the sleeve is arranged between the valve body and the conduit.
The flow control valve according to claim 1, wherein one end of the sleeve occupies an area of 30% or more of the opening and is visually recognized when the valve chamber is viewed from the opening of the conduit.
A valve seat member is fixed to one end of the housing by a brazing material.
The flow rate control valve according to claim 1 or 2, wherein the peripheral edge portion of the valve seat member forms an annular groove together with the inner peripheral surface of the housing.
The flow control valve according to claim 3, wherein a spiral groove through which the brazing material for fixing the housing and the valve seat member flows is formed on the inner peripheral surface of the housing or the outer peripheral surface of the valve seat member. ..
The conduit is fixed to the housing by a brazing material,
An annular gap is formed between the inner peripheral surface of the housing and the outer peripheral surface of the valve seat member.
The flow rate control valve according to claim 3 or 4, wherein the annular gap is formed so that the brazing material that fixes the housing and the conduit enters.
The flow rate control valve according to claim 1 or 2, wherein the housing is formed so as to be plane-symmetric in the axial direction.
It has a valve body drive unit that moves the valve body in the axial direction of the housing.
The valve body driving unit has a cylindrical can, a rotor housed inside the can, and a stator arranged outside the can.
The flow rate control valve according to any one of claims 1 to 5, wherein the housing and the can are joined by welding.
The housing has a cylindrical main body portion and a cylindrical connecting portion connected to the main body portion and joined to the can by welding.
The thickness of the connecting portion is smaller than the thickness of the main body portion and is the same as the thickness of the can.
The flow rate control valve according to claim 7, wherein the outer diameter of the connecting portion is the same as the outer diameter of the can.
The flow control valve according to claim 7 or 8, wherein the holder to which the sleeve is attached or the sleeve is joined by welding at the welded portion between the housing and the can.
At the welded portion between the housing and the can, the holder to which the sleeve is attached is joined by welding.
The flow rate control valve according to claim 7 or 8, wherein the sleeve is attached to the holder by being press-fitted from the housing side toward the can side.