WO2019230427A1

WO2019230427A1 - Flow passage switching valve and method for manufacturing same

Info

Publication number: WO2019230427A1
Application number: PCT/JP2019/019537
Authority: WO
Inventors: 望月　健一; 近藤　大介; 恒吏高橋
Original assignee: 株式会社不二工機; 株式会社デンソー
Priority date: 2018-05-28
Filing date: 2019-05-16
Publication date: 2019-12-05
Also published as: CN112005036B; JPWO2019230427A1; CN112005036A; JP6928356B2

Abstract

[Problem] To provide a flow passage switching valve which can effectively increase the degree of freedom for configuring a valve body, and a method for manufacturing the flow passage switching valve. [Solution] This flow passage switching valve (1) has: a valve body (10) which is made of a resin and is provided with a valve chamber (14); a ball valve body (20) accommodated rotatably in the valve chamber (14); a driving unit (40) having a driving mechanism which rotates the ball valve body (20); and a valve shaft (50) which connects the ball valve body (20) and the driving mechanism. The driving unit (40) has a driving unit case (42) which is made of a resin and accommodates the driving mechanism. In addition, the driving unit case (42) is joined to the valve body (10).

Description

Flow path switching valve and manufacturing method thereof

The present invention relates to a flow path switching valve and a manufacturing method thereof.

An example of a conventional flow path switching valve is disclosed in Patent Document 1. In this flow path switching valve, a ball valve body is rotatably accommodated in a valve case as a valve body. A geared motor that rotationally drives the ball valve body via a valve shaft is attached to the valve case. Further, the valve case is provided with one inlet channel and two outlet channels leading to the valve chamber. This flow path switching valve alternatively connects the inlet flow path to one of the two outlet flow paths according to the rotational position of the ball valve body.

JP 2010-223418 A

Such a flow path switching valve can be used in various devices while reducing costs by making the geared motor, valve shaft and valve body common and changing the configuration of the valve case such as the arrangement of the inlet flow path and the outlet flow path. It becomes possible to make it correspond. However, since it is necessary to provide the valve case with a mounting structure such as a screwing structure or a snap-fit structure for mounting the geared motor, the degree of freedom of the configuration of the valve case may be limited.

Therefore, an object of the present invention is to provide a flow path switching valve capable of effectively increasing the degree of freedom of the configuration of the valve body, and a method for manufacturing the flow path switching valve.

In order to achieve the above object, a flow path switching valve according to an aspect of the present invention includes a valve chamber and a resin valve body provided with a plurality of flow paths leading to the valve chamber, and rotatable in the valve chamber. A valve body that switches connection of the flow path according to a rotational position, a drive unit that has a drive mechanism that rotates the valve body, and a valve shaft that connects the valve body and the drive mechanism. The flow path switching valve has a drive part case made of resin that houses the drive mechanism, and the drive part case is joined to the valve body.

According to the present invention, the resin drive unit case that houses the drive mechanism that rotates the valve body is joined to the valve body. As a result, it is only necessary to share only the joint portion with the drive unit case in the valve body, so that it is possible to effectively increase the degree of freedom in the configuration of the valve body by minimizing the portion subjected to design constraints. it can.

In the present invention, it is preferable that the drive case is ultrasonically welded or infrared welded to the valve body. By doing in this way, compared with the joining by an adhesive agent, for example, it is not necessary to consider the application amount of an adhesive agent and application unevenness, and a drive part case and a valve body can be joined easily. Moreover, since the inside of a drive part case and a valve main body can be welded, it can prevent that a welding location is exposed.

In the present invention, the valve body has a valve shaft insertion hole into which the valve shaft is inserted, and the valve shaft insertion hole is formed so that the valve body rotates as the valve shaft rotates. Preferably it is. By doing so, the valve body and the valve shaft can be separated, and at the time of assembly, the timing for inserting the valve shaft into the valve shaft insertion hole and coupling the valve body and the valve shaft can be selected. For example, after inserting the valve shaft into the valve body accommodated in the valve body, the valve body and the drive case can be combined and welded. Alternatively, the valve body can be accommodated in the valve body, the valve shaft can be supported by the drive unit case, and the valve body and the drive unit case can be welded in combination while the valve shaft is inserted into the valve shaft insertion hole. Thereby, it is possible to select an assembly procedure that is less susceptible to welding.

In the present invention, the drive unit case integrally includes a bearing portion into which the valve shaft is inserted, and the valve shaft includes an annular sealing member that seals a gap with the bearing portion, The valve body is disposed so that the valve shaft insertion hole faces the bearing portion with a space therebetween, and the valve shaft contacts the valve body when the valve shaft advances into the valve shaft insertion hole. It is preferable to have a stopper surface. By doing so, it is possible to prevent the valve shaft from being inserted deeper than necessary into the valve shaft insertion hole during assembly.

In this invention, it is preferable that the distance from the sealing location of the said sealing member in the said bearing part to the end surface by the side of a valve body becomes shorter than the distance from the said valve body side stopper surface to the said valve body. . When ultrasonic welding is used, if the sealing member is in contact with the bearing when applying ultrasonic waves to the drive unit case, the sealing member will melt and adhere to the bearing, or the sealing member may be damaged. May end up. And in this invention, when it has the said structure, when applying an ultrasonic wave to a drive part case, a sealing member is arrange | positioned outside a bearing part by abutting the valve body side stopper surface of a valve shaft against a valve body. be able to. Therefore, it can prevent that a sealing member adheres to a bearing part, or is damaged. Even when infrared welding is employed, it is possible to prevent the valve shaft and the sealing member from dropping from the bearing portion during welding by disposing the sealing member outside the bearing portion.

In the present invention, the valve shaft has a bearing portion side stopper surface that faces the end surface on the valve body side of the bearing portion when the valve shaft faces the valve body side stopper surface and advances into the bearing portion. Preferably it is. In this way, when a force from the valve body side toward the bearing portion side is generated with respect to the valve shaft due to a pressure difference between the valve chamber and the atmosphere, the bearing portion-side stopper surface is placed on the end surface of the bearing portion on the valve body side. bump into. Therefore, the valve shaft can be prevented from falling off.

In the present invention, the valve shaft has an insertion portion that is inserted into the valve shaft insertion hole formed in a polygonal column shape, and the valve shaft insertion hole is formed in the same shape as the cross-sectional shape of the insertion portion. Preferably it is. By doing in this way, the insertion part of a valve shaft and the valve shaft insertion hole of a valve body fit, and rotation of a valve shaft can be reliably transmitted to a valve body.

In the present invention, the valve body has a peripheral wall part, the drive part case has an annular wall part inserted in the welding direction inside the peripheral wall part, and the drive part case is welded to the valve body. It is preferable that the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion are in contact with each other. By doing in this way, at the time of welding, the drive unit case moves in a direction approaching the valve body (welding direction) and the welded portions are joined together, and the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion Is in contact with the valve body, the movement of the drive unit case in the direction perpendicular to the welding direction with respect to the valve body is restricted. Therefore, it can suppress that a drive part case and a valve main body will be welded in the state which the position shifted.

In the present invention, in the state before the drive unit case is welded to the valve body, the length in the welding direction at the contact portion between the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion is 1. It is preferably 5 mm or more. By doing in this way, the part which the inner peripheral surface of a peripheral wall part and the outer peripheral surface of an annular wall part contact sufficiently is secured, and a drive part case and a valve body will be welded in the state where a position shifted. Can be suppressed more effectively.

In the present invention, it is preferable that an annular tapered surface is provided on at least one of a peripheral portion of the valve shaft insertion hole and a peripheral portion of an end surface on the valve body side of the valve shaft. In this way, even if the shafts are misaligned when the valve shaft is inserted into the valve shaft insertion hole, the valve shaft is guided to the valve shaft insertion hole by the annular taper surface and automatically aligned. can do.

In order to achieve the above object, a flow path switching valve manufacturing method according to another aspect of the present invention includes a valve body and a resin valve body provided with a plurality of flow paths leading to the valve chamber, A drive having a valve body rotatably accommodated in the valve chamber and switching the connection of the flow path according to a rotation position, a drive mechanism for rotating the valve body, and a resin drive unit case for housing the drive mechanism And a valve shaft that connects the valve body and the drive mechanism, wherein the drive case is joined to the valve body.

According to the present invention, the resin drive unit case that houses the drive mechanism that rotates the valve body is joined to the valve body. As a result, it is only necessary to share only the welded portion with the drive unit case in the valve body, so that it is possible to minimize the portion subjected to design constraints and effectively increase the degree of freedom of the configuration of the valve body. it can.

In the present invention, the drive unit case integrally includes a bearing portion into which the valve shaft is inserted, and the valve shaft includes an annular sealing member that seals a gap with the bearing portion, The valve body has a valve shaft insertion hole formed so that the valve body rotates as the valve shaft rotates by inserting the valve shaft, and the valve shaft is the valve shaft insertion hole. A valve body-side stopper surface that abuts the valve body when the insertion into the valve body is performed, and the distance from the sealing portion of the sealing member to the end surface on the valve body side in the bearing portion is from the valve body-side stopper surface. The valve shaft is configured to be shorter than the distance to the valve body, and the valve shaft is inserted into the valve shaft insertion hole of the valve body accommodated in the valve chamber until the valve body side stopper surface hits the valve body. The valve shaft insertion hole and the bearing portion are opposed to each other with a space therebetween. A valve body and the drive part case are combined, and the drive part case is ultrasonically or infrared welded to the valve body in a state where the sealing member is outside the bearing part, and the drive part case is attached to the valve body. After welding, it is preferable to move the valve shaft toward the bearing portion along the axial direction so that the sealing member seals the gap. When ultrasonic welding is used, if the sealing member is in contact with the bearing when ultrasonic waves are applied to the drive unit case, the sealing member may melt and adhere to the bearing, or the sealing member may be damaged. May end up. And in this invention, when it has the said structure, when applying an ultrasonic wave to a drive part case, the valve body side stopper surface of a valve shaft is abutted against a valve body, and a sealing member is arrange | positioned outside a bearing part. . Therefore, it can prevent that a sealing member adheres to a bearing part, or is damaged. Even when infrared welding is employed, it is possible to prevent the valve shaft and the sealing member from dropping from the bearing portion during welding by disposing the sealing member outside the bearing portion.

In the present invention, the annular wall portion of the drive unit case is inserted in the welding direction inside the peripheral wall portion of the valve body, and the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion are brought into contact with each other. After combining the valve body and the drive unit case so that the length in the welding direction at the contact portion between the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion is 1.5 mm or more, It is preferable that the driver case is ultrasonically or infraredly welded to the valve body. By doing in this way, at the time of welding, the drive unit case moves in the direction approaching the valve body (welding direction) and is welded, so that the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion are in contact with each other, The drive unit case is restricted from moving in the direction orthogonal to the welding direction with respect to the valve body. Further, by setting the length in the welding direction at the contact portion between the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion to be 1.5 mm or more, the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion are Sufficient contact area can be secured. Therefore, it can suppress effectively that a drive part case and a valve main body will shift and weld.

According to the present invention, the degree of freedom of the configuration of the valve body can be effectively increased.

It is a front view of the flow-path switching valve which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the flow-path switching valve of FIG. It is a perspective view containing the partial cross section of the flow-path switching valve of FIG. It is a disassembled perspective view containing the partial cross section of the flow-path switching valve of FIG. It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 1 (state which inserted the valve stem in the ball valve body). It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 1 (The state which combined the valve main body and the drive part case). It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 1 (The state which moved the valve shaft to the bearing part side). It is sectional drawing explaining the manufacturing method of the flow-path switching valve which concerns on 2nd Embodiment of this invention (state which inserted the valve stem in the ball valve body). It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 8 (The state which combined the valve main body and the drive part case). It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 8 (The state which moved the valve shaft to the bearing part side). It is sectional drawing explaining the manufacturing method of the flow-path switching valve which concerns on 3rd Embodiment of this invention (state which inserted the valve shaft in the bearing part). It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 11 (state which irradiates infrared rays to a valve main body and a drive part case). It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 11 (the state which combined the valve main body and the drive part case, before welding). It is sectional drawing explaining the manufacturing method of the flow-path switching valve of FIG. 11 (The state which combined the valve main body and the drive part case, after welding).

(First embodiment)
Hereinafter, the configuration of the flow path switching valve according to the first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a front view of a flow path switching valve according to a first embodiment of the present invention. 2A is a cross-sectional view (longitudinal cross-sectional view) along the axial direction of the valve shaft of the flow path switching valve of FIG. 1, and FIG. 2B is surrounded by a one-dot chain line in FIG. It is the figure which expanded the part. FIG. 3 is a perspective view including a partial cross section of the flow path switching valve of FIG. FIG. 4 is an exploded perspective view including a partial cross section of the flow path switching valve of FIG. In the present specification, “up, down, left and right” is used in each drawing to indicate the relative positional relationship between the members, and does not indicate an absolute positional relationship.

As shown in FIGS. 1 to 4, the flow path switching valve 1 of the present embodiment includes a valve body 10, a ball valve body 20,

support members

30 and 30, a drive unit 40, and a valve shaft 50. Have.

The valve body 10 is made of a synthetic resin as a material and is formed in a substantially cubic box shape having an open top. The valve main body 10 includes a bottom wall portion 15 and a peripheral wall portion 16 that is connected to the peripheral edge portion of the bottom wall portion 15. The peripheral wall portion 16 includes a left wall portion 10a, a front wall portion 10b, a right wall portion 10c, and a back wall portion 10d. A substantially L-shaped first flow path 11 is provided in the left side wall portion 10a. A straight second flow path 12 is provided in the front wall portion 10b. A substantially L-shaped third flow path 13 is provided in the right side wall portion 10c. The opening 11 a of the first flow path 11, the opening 12 a of the second flow path 12, and the opening 13 a of the third flow path 13 are directed in the same direction (front side, front side in FIG. 1). The first flow path 11, the second flow path 12, and the third flow path 13 communicate with a valve chamber 14 provided in the valve body 10. Two or four or more flow paths leading to the valve chamber 14 may be provided.

The ball valve body 20 is formed in a hollow ball shape (spherical shape) using, for example, metal or synthetic resin as a material. The ball valve body 20 is rotatably accommodated in the valve chamber 14 of the valve body 10. In the state shown in FIG. 3, the ball valve body 20 includes a first opening 21 that opens toward the left side, a second opening 22 that opens toward the front, and a third opening 23 that opens toward the right side. And are provided. The first opening 21, the second opening 22, and the third opening 23 are connected to each other within the ball valve body 20. In this embodiment, the ball valve body 20 is used as the valve body, but a columnar valve body may be used.

The ball valve body 20 connects the first flow path 11, the second flow path 12, and the third flow path 13 at the rotational position shown in FIG. 3. The ball valve body 20 connects the first flow path 11 and the second flow path 12 at a rotation position rotated 90 degrees clockwise in plan view from the rotation position shown in FIG. The ball valve body 20 connects the second flow path 12 and the third flow path 13 at a rotation position rotated 90 degrees counterclockwise in plan view from the rotation position shown in FIG. The ball valve body 20 switches the connection between the first flow path 11, the second flow path 12, and the third flow path 13 according to the rotational position.

A valve shaft insertion hole 24 into which the valve shaft 50 is inserted is provided in the upper part of the ball valve body 20. The valve shaft insertion hole 24 is formed such that when the valve shaft 50 is inserted, the ball valve body 20 rotates as the valve shaft 50 rotates. Specifically, the valve shaft insertion hole 24 is formed in the same shape as the cross-sectional shape (transverse cross-sectional shape) in the direction orthogonal to the axial direction of the prismatic portion 52 of the valve shaft 50.

The

support members

30 and 30 are formed in an annular shape using, for example, a synthetic resin. The

support members

30 and 30 are rotatably supported in the valve chamber 14 with the ball valve body 20 interposed therebetween. The

support members

30, 30 seal (seal) the valve body 10 and the ball valve body 20 together with O-

rings

31, 31 made of a rubber material provided between the valve body 10.

The drive unit 40 includes a drive mechanism in which a reduction gear including a motor and a gear 41 (not shown) is combined, and a resin drive unit case 42 that houses the drive mechanism. The drive unit case 42 is formed in a substantially rectangular parallelepiped box shape. The drive unit case 42 includes a lower case 43 and an upper case 44. The lower case 43 and the upper case 44 are assembled to each other by a mounting structure (not shown) such as a screwing structure or a snap fit structure.

The lower case 43 integrally has a cylindrical bearing portion 45 at the center of the bottom wall 43a. The bearing portion 45 rotatably supports the valve shaft 50 while the valve shaft 50 is inserted. Further, the bottom wall 43a of the lower case 43 is provided with a rib 43b as an annular wall portion. The rib 43 b is inserted inside the peripheral wall portion 16 of the valve body 10. The rib 43b is formed so as to be fitted to the peripheral wall portion 16. The outer peripheral surface of the rib 43 b is in contact with the inner peripheral surface of the peripheral wall portion 16. The rib 43 b is combined with the upper end portion of the peripheral wall portion 16 of the valve body 10 and joined to each other at the weld portion M. In this embodiment, the welding part M is ultrasonically welded. The welding part M may be infrared welded instead of ultrasonic welding.

The valve shaft 50 has a cylindrical portion 51 and a rectangular column portion 52 that is coaxially connected to the lower end of the cylindrical portion 51. The axis of the valve shaft 50 coincides with the axis L.

The cylindrical part 51 is provided with an annular stopper part 53 projecting radially outward at its lower end. The stopper portion 53 is formed so that the outer diameter thereof is larger than the outer diameter of the cylindrical portion 51 and the inner diameter of the bearing portion 45. Accordingly, when the insertion of the cylindrical portion 51 into the bearing portion 45 is advanced, the bearing portion-side stopper surface 53a that is the upper surface of the stopper portion 53 abuts against the lower end surface 45a of the bearing portion 45 on the ball valve body 20 side. During normal operation or no load, a clearance (clearance) is provided between the lower end surface 45a of the bearing portion 45 and the bearing portion side stopper surface 53a.

Further, a groove 51 a is formed at the lower end portion of the cylindrical portion 51 at a position above the stopper portion 53 over the entire circumference. The groove 51a is fitted with a sealing member 54 (O-ring) formed in an annular shape using a rubber material or the like as a material. The cylindrical portion 51 is inserted into the bearing portion 45 and is rotatably supported by the bearing portion 45. The outer diameter of the cylindrical portion 51 is slightly smaller than the inner diameter of the bearing portion 45. When the cylindrical portion 51 is inserted into the bearing portion 45, the sealing member 54 seals the gap between the valve shaft 50 and the bearing portion 45. Thereby, the fluid in the valve chamber 14 is prevented from leaking to the outside.

The gear 41 of the drive unit 40 is fixedly attached to the upper end of the cylindrical part 51 by press-fitting. The valve shaft 50 is rotated around the axis L as the rotation of the gear 41. A flat portion that suppresses idle rotation of the press-fitted gear 41 is provided at the upper end portion of the cylindrical portion 51.

The rectangular column part 52 is formed in a columnar shape whose cross-sectional shape is a regular hexagonal shape. The prism portion 52 is an insertion portion that is inserted into the valve shaft insertion hole 24 of the ball valve body 20. The valve shaft insertion hole 24 is formed in the same hexagonal shape as the cross-sectional shape of the prism portion 52. Therefore, the valve shaft insertion hole 24 and the prism portion 52 are fitted to each other, and the ball valve body 20 is rotated with the rotation of the valve shaft 50. Further, the prism 52 is formed so that its outer diameter is smaller than that of the stopper 53. Thereby, when the insertion of the prism portion 52 into the valve shaft insertion hole 24 is advanced, the valve-body-side stopper surface 53 b that is the lower surface of the stopper portion 53 abuts against the ball valve body 20.

In the present embodiment, the prism portion 52 is formed in a column shape having a regular hexagonal cross-sectional shape, but is not limited thereto. For example, the prism portion 52 may have a polygonal column shape such as a triangular column shape or a quadrangular column shape. Furthermore, a member having a shape other than the prism may be used as the prism 52, for example, a column having a D-shaped cross section in which a part of the side surface of the cylinder is flat. In this case, the valve shaft insertion hole 24 is also formed in the same shape as the cross-sectional shape of the prism portion 52.

As shown in FIG. 2 (b), the flow path switching valve 1 extends from the sealing portion K of the sealing member 54 in the bearing portion 45 to the lower end surface 45 a on the ball valve body 20 side in the axial direction of the valve shaft 50. The distance A is configured to be shorter than the distance B from the valve body side stopper surface 53 b to the ball valve body 20. With this configuration, when the insertion of the rectangular column portion 52 of the valve shaft 50 is advanced until the valve-side stopper surface 53b hits the ball valve body 20 into the valve shaft insertion hole 24 of the ball valve body 20, the sealing member 54 is moved to the bearing portion 45. And is positioned in the valve chamber 14. In addition, in this embodiment, although the sealing location K is made into the location corresponding to the center of the up-down direction of the sealing member 54 in the bearing part 45, in addition to this, the sealing location K in the bearing part 45 is used. It is good also as a location corresponding to the upper wall part of groove 51a.

In the flow path switching valve 1, the rotation of the motor of the drive unit 40 is output to the valve shaft 50 through the gear 41, and the valve shaft 50 is rotated about the axis L as the rotation axis. With the rotation of the valve shaft 50, the ball valve body 20 is rotated and positioned at each rotation position. Thereby, the connection of the flow path according to the rotation position is realized.

Next, an example of a method for manufacturing the flow path switching valve 1 of the present embodiment will be described with reference to FIGS.

5 to 7 are cross-sectional views for explaining a method of manufacturing the flow path switching valve of FIG. 1, in which the valve shaft 50 is inserted into the ball valve body 20 in order, the valve body 10 and the drive unit case 42. The state which combined these, and the state which moved the valve shaft 50 to the bearing part 45 side are shown.

As shown in FIG. 5, the rectangular column portion 52 of the valve shaft 50 is inserted into the valve shaft insertion hole 24 of the ball valve body 20 accommodated in the valve chamber 14 until the valve body side stopper surface 53 b hits the ball valve body 20.

Next, as shown in FIG. 6, the valve body 10 and the lower case 43 of the drive unit case 42 are combined so that the valve shaft insertion hole 24 and the bearing portion 45 face each other with an interval in the vertical direction. Specifically, the rib 43b is inserted inside the peripheral wall portion 16 of the valve body 10 along the vertical direction (that is, the direction in which the drive unit case approaches the valve main body during welding (welding direction)). It arrange | positions so that an internal peripheral surface and the outer peripheral surface of the rib 43b may contact | connect. As a result, the upper end portion of the cylindrical portion 51 of the valve shaft 50 is inserted into the bearing portion 45, and the lower end portion of the cylindrical portion 51 is outside the bearing portion 45. In this state, the sealing member 54 is located in the valve chamber 14 below the bearing portion 45, and the sealing member 54 does not contact the bearing portion 45 and does not press the inside thereof. That is, in this state, the sealing member 54 is outside the bearing portion 45. Then, the shaft center of the valve shaft 50 and the bearing portion 45 are arranged so that the cylindrical portion 51 of the valve shaft 50 and the bearing portion 45 are not in contact with each other (a gap is formed with the bearing portion 45 over the entire outer circumference of the cylindrical portion 51). To match the axis.

Next, ultrasonic waves are applied to the lower case 43 of the drive unit case 42 in a state where the sealing member 54 is outside the bearing portion 45, and the lower case 43 is ultrasonically welded to the valve body 10. At this time, since the lower case 43 is in contact only with the valve body 10 and is not in contact with the valve shaft 50 and the sealing member 54, ultrasonic waves can be applied only between the lower case 43 and the valve body 10. it can. Further, when the lower case 43 is welded to the valve body 10, the inner peripheral surface of the peripheral wall portion 16 and the outer peripheral surface of the rib 43 b are in contact with each other. Therefore, the lower case 43 is guided by the peripheral wall portion 16 and the rib 43b so as to move along the vertical direction, and movement in a direction perpendicular to the vertical direction is restricted. Thereby, the lower case 43 and the valve body 10 can be joined with high accuracy.

Next, as shown in FIG. 7, the valve shaft 50 is moved toward the bearing portion 45 along the axial direction so that the sealing member 54 seals the gap between the valve shaft 50 and the bearing portion 45.

Then, the drive mechanism is assembled into the lower case 43 by press-fitting the gear 41 into the upper end portion of the cylindrical portion 51 of the valve shaft 50, and the drive portion 40 is assembled by covering the upper case 44. In this way, the flow path switching valve 1 is completed.

As described above, according to the flow path switching valve 1 of the present embodiment, the resin drive unit case 42 that houses the drive mechanism that rotates the ball valve body 20 is joined to the valve body 10. Since the valve body 10 does not have a ceiling surface (a wall surface on the drive unit case 42 side), after welding to the drive unit case 42, a part of the wall surface (bottom surface) of the drive unit case 42 is a wall surface (ceiling) of the valve chamber. The surface). Since it did in this way, only the welding part with the drive part case 42 in the valve main body 10 should just be made common, Therefore The place which receives restrictions on a design is minimized and the freedom degree of composition of the valve main body 10 is effective. Can be increased.

Also, the drive unit case 42 is ultrasonically welded to the valve body 10. By doing in this way, since the inside of the drive part case 42 and the valve main body 10 can be welded easily, it can prevent that a welding location is exposed. In addition, by adopting ultrasonic welding (or infrared welding), for example, compared to bonding with an adhesive, there is no need to consider the amount of adhesive applied or uneven application, and the drive case and valve body can be easily Can be joined.

Further, the ball valve body 20 has a valve shaft insertion hole 24 into which the valve shaft 50 is inserted. The valve shaft insertion hole 24 is formed so that the ball valve body 20 rotates as the valve shaft 50 rotates. By doing so, the ball valve body 20 and the valve shaft 50 are separate and can be separated from each other. Thereby, the timing which couple | bonds the ball | bowl valve body 20 and the valve shaft 50 at the time of an assembly can be selected. Therefore, an assembly procedure that is less susceptible to welding can be selected.

That is, the flow path switching valve 1 of the present embodiment is a separate body in which the ball valve body 20 and the valve shaft 50 can be separated from each other, and is configured to be able to change the positional relationship with each other during assembly. For example, in a configuration in which the ball valve body 20 and the valve shaft 50 are integrated, the positional relationship between the ball valve body 20 and the valve shaft 50 cannot be changed during assembly. Therefore, when the valve body 10 and the drive unit case 42 are ultrasonically welded, the respective members are arranged at the same position as when the flow path switching valve 1 is completed. Therefore, when ultrasonic waves are applied to the lower case 43 for ultrasonic welding, vibrations due to ultrasonic waves are sequentially generated from the bearing portion 45 in the sealing member 54, the valve shaft 50, the ball valve body 20, the

support members

30, 30, and It is transmitted to O-

rings

31 and 31. As a result, the sealing member 54 and the bearing portion 45, the ball valve body 20 and the

support members

30 and 30, and the valve body 10 and the O-

rings

31 and 31 may be rubbed against each other to be melted or damaged. There is. Therefore, in the flow path switching valve 1 of the present embodiment, the mutual positional relationship between the ball valve body 20 and the valve shaft 50 is changed at the time of assembly, and vibration due to ultrasonic waves applied to the lower case 43 is caused by the sealing member 54. The ball valve body 20 and the O-

rings

31 and 31 are not transmitted.

Further, the drive unit case 42 integrally has a bearing unit 45 into which the valve shaft 50 is inserted. The valve shaft 50 has an annular sealing member 54 that seals a gap with the bearing portion 45. The ball valve body 20 is disposed so as to face the bearing portion 45 at an interval, and the valve shaft formed so that the ball valve body 20 rotates as the valve shaft 50 rotates by inserting the valve shaft 50. An insertion hole 24 is provided. The valve shaft 50 has a valve body-side stopper surface 53b that abuts against the ball valve body 20 when insertion into the valve shaft insertion hole 24 is advanced. By doing so, it is possible to prevent the valve shaft 50 from being inserted deeper than necessary into the valve shaft insertion hole 24 during assembly. The distance A from the sealing portion K of the sealing member 54 in the bearing portion 45 to the lower end surface 45a on the ball valve body 20 side is shorter than the distance B from the valve body side stopper surface 53b to the ball valve body 20. It is configured. When ultrasonic welding is employed, if the sealing member 54 is in contact with the bearing portion 45 when ultrasonic waves are applied to the drive unit case 42, the sealing member 54 melts and adheres to the bearing portion 45 or is sealed. The stop member 54 may be damaged. In the flow path switching valve 1 of the present embodiment, the ball valve body 20 and the valve shaft 50 are separate and have the above-described configuration, so that when applying ultrasonic waves to the drive unit case 42, the valve shaft 50 The sealing member 54 can be disposed outside the bearing portion 45 by abutting the valve body-side stopper surface 53b against the ball valve body 20. Therefore, it can prevent that the sealing member 54 adheres to the bearing part 45, or is damaged.

Further, when the valve shaft 50 faces away from the valve body side stopper surface 53b and is inserted into the bearing portion 45, the bearing portion side stopper surface 53a abuts against the lower end surface 45a of the ball valve body 20 side of the bearing portion 45. have. By doing in this way, when the force which goes to the bearing part 45 side from the ball valve body 20 side with respect to the valve shaft 50 by the pressure difference with the inside of the valve chamber 14 and air | atmosphere arises, the bearing part side stopper surface 53a It strikes against the lower end surface 45a of the bearing portion 45. Therefore, it is possible to suppress the valve shaft 50 from falling off.

In addition, the valve shaft 50 is formed in the shape of a regular hexagonal columnar prism portion 52 into which the valve shaft insertion hole 24 is inserted, and the valve shaft insertion hole 24 is formed in the same shape as the cross-sectional shape of the prismatic column portion 52. . By doing so, the prism portion 52 of the valve shaft 50 and the valve shaft insertion hole 24 are fitted together, and the rotation of the valve shaft 50 can be reliably transmitted to the ball valve body 20.

Further, the valve body 10 has the peripheral wall portion 16, and the drive unit case 42 has a rib 43 b as an annular wall portion inserted along the vertical direction inside the peripheral wall portion 16. And when the drive part case 42 is welded to the valve main body 10, it is comprised so that the internal peripheral surface of the surrounding wall part 16 and the outer peripheral surface of the rib 43b may contact | connect. By doing in this way, the drive part case 42 moves to the direction orthogonal to an up-down direction with respect to the valve main body 10 because the inner peripheral surface of the surrounding wall part 16 and the outer peripheral surface of the rib 43b contact | connect at the time of welding. Be regulated. Therefore, it can suppress that the drive part case 42 and the valve main body 10 are displaced and welded.

(Second Embodiment)
Hereinafter, a flow path switching valve according to a second embodiment of the present invention will be described with reference to FIGS.

The flow path switching valve 2 according to the second embodiment has a valve shaft 50A in which the stopper portion 53 is not provided in place of the valve shaft 50 in the flow path switching valve 1 according to the first embodiment described above. Yes. About the structure of those other than this, the flow-path switching valve 2 has the structure similar to the flow-path switching valve 1. FIG. Regarding the flow path switching valve 2, the same components as those of the above-described flow path switching valve 1 are denoted by the same reference numerals, and description thereof is omitted.

FIGS. 8 to 10 are cross-sectional views for explaining a method of manufacturing a flow path switching valve according to the second embodiment of the present invention. The valve body 50A is inserted into the ball valve body 20 in order, and the valve body 10 And the drive unit case 42 are combined, and the valve shaft 50A is moved to the bearing unit 45 side.

The valve shaft 50 A includes a cylindrical portion 51 and a prism portion 52 that is coaxially connected to the lower end of the cylindrical portion 51. The axis of the valve shaft 50A coincides with the axis L.

The cylindrical portion 51 is formed so that its outer diameter is smaller than the outer diameter of the prism portion 52. In other words, when the valve shaft 50 A is viewed from the direction of the axis L, the cylindrical portion 51 is included in the projected area of the prism portion 52. Accordingly, when the insertion of the cylindrical portion 51 into the bearing portion 45 is advanced, the bearing portion-side stopper surface 52a that is the upper surface of the prismatic portion 52 abuts against the lower end surface 45a of the bearing portion 45 on the ball valve body 20 side.

The rectangular column part 52 is formed in a columnar shape whose cross-sectional shape is a regular hexagonal shape. The prism portion 52 is an insertion portion that is inserted into the valve shaft insertion hole 24 of the ball valve body 20. The valve shaft insertion hole 24 is formed in the same hexagonal shape as the cross-sectional shape of the prism portion 52. Therefore, the valve shaft insertion hole 24 and the prism portion 52 are fitted together, and the ball valve body 20 is rotated with the rotation of the valve shaft 50A. Further, when the insertion of the prismatic part 52 into the valve shaft insertion hole 24 is advanced, the valve-body-side stopper surface 52 b that is the lower surface of the prismatic part 52 abuts against the ball valve element 20.

As shown in FIG. 10, in the flow path switching valve 2, the distance A from the sealing portion K of the sealing member 54 in the bearing portion 45 to the lower end surface 45a on the ball valve body 20 side is the distance from the valve body side stopper surface 52b to the ball. It is comprised so that it may become shorter than the distance B to the valve body 20. FIG. With this configuration, when the insertion of the rectangular column portion 52 of the valve shaft 50A is advanced into the valve shaft insertion hole 24 of the ball valve body 20 until the valve body side stopper surface 52b hits the ball valve body 20, the sealing member 54 becomes the bearing portion 45. Positioned outside.

Next, an example of a method for manufacturing the flow path switching valve 2 of the present embodiment will be described with reference to FIGS.

As shown in FIG. 8, the prism 52 of the valve shaft 50 A is inserted into the valve shaft insertion hole 24 of the ball valve body 20 accommodated in the valve chamber 14 until the valve body side stopper surface 52 b hits the ball valve body 20.

Next, as shown in FIG. 9, the valve body 10 and the lower case 43 of the drive unit case 42 are combined so that the valve shaft insertion hole 24 and the bearing portion 45 face each other with a space in the vertical direction. Specifically, the rib 43b is inserted along the vertical direction inside the peripheral wall portion 16 of the valve body 10, and is arranged so that the inner peripheral surface of the peripheral wall portion 16 and the outer peripheral surface of the rib 43b are in contact with each other. Thereby, the upper end portion of the columnar portion 51 of the valve shaft 50 A is inserted into the bearing portion 45, and the lower end portion of the columnar portion 51 is outside the bearing portion 45. In this state, the sealing member 54 is positioned in the valve chamber 14 below the bearing portion 45, that is, the sealing member 54 is outside the bearing portion 45. Then, the shaft center of the valve shaft 50A and the bearing portion 45 are arranged so that the cylindrical portion 51 of the valve shaft 50A and the bearing portion 45 are not in contact with each other (a gap is formed with the bearing portion 45 over the entire outer circumference of the cylindrical portion 51). To match the axis.

Next, ultrasonic waves are applied to the lower case 43 of the drive unit case 42 in a state where the sealing member 54 is outside the bearing portion 45, and the lower case 43 is ultrasonically welded to the valve body 10. At this time, the lower case 43 is in contact only with the valve body 10 and is not in contact with the valve shaft 50 A and the sealing member 54, so that ultrasonic waves can be applied only between the lower case 43 and the valve body 10. it can. Further, when the lower case 43 is welded to the valve body 10, the inner peripheral surface of the peripheral wall portion 16 and the outer peripheral surface of the rib 43 b are in contact with each other. Therefore, the lower case 43 is guided so as to move along the vertical direction, and movement in the direction orthogonal to the vertical direction is restricted. Thereby, the lower case 43 and the valve body 10 can be joined with high accuracy.

Next, the valve shaft 50A is moved toward the bearing portion 45 along the axial direction so that the sealing member 54 seals the gap between the valve shaft 50A and the bearing portion 45.

Then, the drive mechanism is assembled into the lower case 43 by press-fitting the gear 41 into the upper end portion of the cylindrical portion 51 of the valve shaft 50A, and the drive unit 40 is assembled by covering the upper case 44. In this way, the flow path switching valve 2 is completed.

Also in the flow path switching valve 2 of the present embodiment, the same effects as the flow path switching valve 1 of the first embodiment described above are exhibited.

The first and second embodiments described above have a configuration in which the drive unit case 42 (specifically, the lower case 43) is ultrasonically welded to the valve body 10. As a welding method, infrared welding may be employed instead of ultrasonic welding. In this case, after welding the welding part of the drive part case 42 and the valve main body 10 with infrared rays, it contacts and welds. By doing so, only the welding location with the drive unit case 42 in the valve body 10 needs to be shared, so as in the case of ultrasonic welding, the location subject to design constraints is minimized, and the configuration of the valve body is reduced. The degree of freedom can be effectively increased.

(Third embodiment)
Hereinafter, a flow path switching valve according to a third embodiment of the present invention will be described with reference to FIGS.

The flow path switching valve 3 according to the third embodiment is used to weld the lower case 43 and the valve body 10 by infrared welding instead of ultrasonic welding in the flow path switching valve 2 according to the second embodiment described above. It has a configuration. Regarding the flow path switching valve 3, the same components as those of the flow

path switching valves

1 and 2 described above are denoted by the same reference numerals, and description thereof is omitted.

FIGS. 11 to 14 are cross-sectional views illustrating a method for manufacturing a flow path switching valve according to the third embodiment of the present invention. 11 to 14 show, in order, the state in which the valve shaft 50A is inserted into the bearing portion 45 of the drive unit case 42, the state in which the valve body 10 and the drive unit case 42 are irradiated with infrared light, the valve body 10 and the drive unit case 42. And a combination of the valve main body 10 and the drive unit case 42 (welding state).

The valve body 10 is provided with a valve body-side welded portion 16a. The valve body-side welded portion 16 a is an annular protrusion formed so as to protrude upward from the upper end of the peripheral wall portion 16.

An annular tapered surface 24 a is provided on the peripheral edge of the valve shaft insertion hole 24 in the ball valve body 20. An annular tapered surface 52c is provided at the peripheral edge of the valve body-side stopper surface 52b, which is the lower surface of the valve shaft 50 (the end surface on the ball valve body 20 side). By doing so, even when the shafts 50 are displaced when the valve shaft 50 is inserted into the valve shaft insertion hole 24, the valve shaft 50 is guided to the valve shaft insertion hole 24 by the tapered surface 24a and the tapered surface 52c. Can be automatically aligned. Only one of the tapered surface 24a and the tapered surface 52c may be provided.

The lower case 43 is provided with a case side weld 43c. The case-side weld 43c is an annular protrusion that is formed so as to protrude downward from the bottom wall 43a. The case side welding part 43c is arrange | positioned so that the rib 43b may be enclosed. The case side welding part 43c has the same shape as the valve main body side welding part 16a in plan view. An annular tapered surface 43d is provided on the outer edge portion of the lower end surface of the rib 43b. Even when the axis is displaced when the rib 43b is inserted inside the peripheral wall portion 16 of the valve body 10, the tapered surface 43d hits the peripheral wall portion 16 so that the rib 43b can be guided to the inside of the peripheral wall portion 16.

Next, an example of a method for manufacturing the flow path switching valve 3 of the present embodiment will be described with reference to FIGS.

As shown in FIG. 11, the ball valve body 20 is accommodated in the valve chamber 14 of the valve body 10. Further, the cylindrical portion 51 of the valve shaft 50 A is inserted into the bearing portion 45 provided in the lower case 43 of the drive unit case 42. In this state, the sealing member 54 seals the gap between the valve shaft 50 A and the bearing portion 45.

Next, as shown in FIG. 12, the valve body 10 and the lower case 43 of the drive unit case 42 are combined partway. Specifically, the rib 43b is inserted along the vertical direction inside the peripheral wall portion 16 of the valve body 10, and is arranged so that the inner peripheral surface of the peripheral wall portion 16 and the outer peripheral surface of the rib 43b are in contact with each other. At this time, the valve body-side welded portion 16a and the case-side welded portion 43c face each other with an interval in the vertical direction. In this state, each of the valve main body side welded portion 16a and the case side welded portion 43c is irradiated with infrared rays to melt each. In the state shown in FIG. 12, the valve shaft 50 has not yet been inserted into the valve shaft insertion hole 24, but the valve shaft 50 may be inserted into the valve shaft insertion hole 24. Irradiation with infrared rays may be performed in the state shown in FIG.

Next, as shown in FIGS. 13 and 14, the valve body 10 and the lower case 43 of the drive unit case 42 are combined to the end. Specifically, as shown in FIG. 13, the insertion of the rib 43b into the peripheral wall portion 16 of the valve body 10 is advanced to bring the valve body-side welded portion 16a and the case-side welded portion 43c into contact with each other. And as shown in FIG. 14, the said insertion is further advanced and the valve main body side welding part 16a and the case side welding part 43c are welded mutually. In parallel with this, the valve shaft 50 is inserted into the valve shaft insertion hole 24.

The distance between the valve body 10 and the lower case 43 in a state where the valve body side welded portion 16a and the case side welded portion 43c are in contact with each other (FIG. 13, contact state) is C. Let D be the distance between the valve body 10 and the lower case 43 in a state where the valve body side welded portion 16a and the case side welded portion 43c are welded (FIG. 14, welded state). A value obtained by subtracting the distance D from the distance C is a distance (referred to as “amount of welding”) between the valve body 10 and the lower case 43 by welding. This welding amount is preferably about 0.3 mm to 1.0 mm.

In the contact state shown in FIG. 13, it is preferable that the vertical length E at the contact portion between the inner peripheral surface of the peripheral wall portion 16 and the outer peripheral surface of the rib 43b is 1.5 mm or more. Thus, the lower casing 43 is guided so as to move in the vertical direction because the inner peripheral surface of the peripheral wall portion 16 and the outer peripheral surface of the rib 43b are in contact with each other, and the movement in the direction perpendicular to the vertical direction is performed. Be regulated. Thereby, the lower case 43 and the valve body 10 can be joined with high accuracy. Further, by setting the length E to 1.5 mm or more, it is possible to sufficiently secure a portion where the inner peripheral surface of the peripheral wall portion 16 and the outer peripheral surface of the rib 43b are in contact with each other. Therefore, it can suppress more effectively that the drive part case 42 and the valve main body 10 will be welded in the state which the position shifted.

Then, the drive mechanism is assembled into the lower case 43 by press-fitting the gear 41 into the upper end portion of the cylindrical portion 51 of the valve shaft 50A, and the drive unit 40 is assembled by covering the upper case 44. In this way, the flow path switching valve 3 is completed.

The flow path switching valve 3 of the present embodiment also has the same effects as the flow path switching valve 1 of the first embodiment described above.

In addition, you may assemble the flow-path switching valve 3 in the procedure similar to the flow-path switching valve 2 of 2nd Embodiment mentioned above. That is, the prism 52 of the valve shaft 50 A is inserted into the valve shaft insertion hole 24 of the ball valve body 20 accommodated in the valve chamber 14 until the valve body side stopper surface 52 b hits the ball valve body 20. The valve body 10 and the lower case 43 of the drive unit case 42 may be combined and welded with infrared rays. As described above, even when infrared welding is employed, by disposing the sealing member 54 outside the bearing portion 45, the valve shaft 50 and the sealing member 54 may fall off from the bearing portion 45 during welding. Can be prevented.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Those in which those skilled in the art appropriately added, deleted, and changed the design of the above-described embodiments, and combinations of the features of the embodiments as appropriate, are also within the scope of the present invention. Included in the range.

1, 2, 3 ... flow path switching valve, 10 ... valve body, 10a ... left side wall, 10b ... front wall, 10c ... right side wall, 10d ... back wall, 11 ... first flow path, 12 ... first 2 channel, 13 ... 3rd channel, 11a, 12a, 13a ... opening, 14 ... valve chamber, 15 ... bottom wall part, 16 ... peripheral wall part, 16a ... valve body side welding part, 20 ... ball valve body, 21 ... 1st opening, 22 ... 2nd opening, 23 ... 3rd opening, 24 ... Valve shaft insertion hole, 24a ... Tapered surface, 30 ... Supporting member, 31 ... O-ring, 40 ... Drive part, 41 ... Gear, 42 ... Drive part case, 43 ... lower case, 43a ... bottom wall, 43b ... rib, 43c ... case-side welded part, 43d ... tapered surface, 44 ... upper case, 45 ... bearing part, 45a ... lower end face, 50 ... valve stem, 51 ... cylindrical part, 51a ... groove, 52 ... rectangular column part, 53 ... stopper part, 52a, 53a ... bearing part side strike Pa surface, 52b, 53b ... Valve body side stopper surface, 52c ... Tapered surface, 54 ... Sealing member, M ... Welding part, K ... Sealing part, A ... Distance from sealing part to lower end surface of bearing part, B ... Distance from the valve body side stopper surface to the ball valve body, C ... Distance between the valve body and the lower case when the valve body side welded part and the case side welded part are in contact with each other, D ... Valve body side welded part and case The distance between the valve main body and the lower case in a state where the side welded portion is welded, E: the vertical length at the contact portion between the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the rib

Claims

A resin valve body provided with a valve chamber and a plurality of flow paths leading to the valve chamber, a valve body rotatably accommodated in the valve chamber, and switching the connection of the flow paths according to a rotation position; A flow path switching valve having a drive unit having a drive mechanism for rotating the valve body, and a valve shaft connecting the valve body and the drive mechanism,
The drive unit has a resin drive unit case that houses the drive mechanism;
The flow path switching valve, wherein the drive unit case is joined to the valve body.
2. The flow path switching valve according to claim 1, wherein the drive case is ultrasonically welded or infrared welded to the valve body.
The valve body has a valve shaft insertion hole into which the valve shaft is inserted;
The flow path switching valve according to claim 2, wherein the valve shaft insertion hole is formed so that the valve body rotates with the rotation of the valve shaft.
The drive part case integrally has a bearing part into which the valve shaft is inserted,
The valve shaft has an annular sealing member that seals a gap with the bearing portion;
The valve body is disposed such that the valve shaft insertion hole faces the bearing portion with a gap therebetween,
The flow path switching valve according to claim 3, wherein the valve shaft has a valve body-side stopper surface that abuts against the valve body when the valve shaft is inserted into the valve shaft insertion hole.
The distance from the sealing part of the sealing member in the bearing portion to the end face on the valve body side is configured to be shorter than the distance from the valve body side stopper surface to the valve body. 4. The flow path switching valve according to 4.
The valve shaft has a bearing portion-side stopper surface that faces the end surface of the bearing portion on the valve body side when the valve shaft faces the valve body-side stopper surface and the insertion into the bearing portion is advanced. The flow path switching valve according to claim 4 or 5.
The valve shaft is formed into a polygonal columnar insertion portion to be inserted into the valve shaft insertion hole,
The flow path switching valve according to any one of claims 3 to 6, wherein the valve shaft insertion hole is formed in the same shape as a cross-sectional shape of the insertion portion.
The valve body has a peripheral wall;
The drive unit case has an annular wall part inserted in the welding direction inside the peripheral wall part,
The inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion are in contact with each other when the drive unit case is welded to the valve body. The flow path switching valve according to claim 7.
In the state before the drive unit case is welded to the valve body, the length in the welding direction at the contact portion between the inner peripheral surface of the peripheral wall portion and the outer peripheral surface of the annular wall portion is 1.5 mm or more. The flow path switching valve according to claim 8.
10. An annular tapered surface is provided on at least one of a peripheral portion of the valve shaft insertion hole and a peripheral portion of an end surface of the valve shaft on the valve body side. The flow path switching valve according to Item.
A resin valve body provided with a valve chamber and a plurality of flow paths leading to the valve chamber, a valve body rotatably accommodated in the valve chamber, and switching the connection of the flow paths according to a rotation position; Manufacture of a flow path switching valve having a drive unit having a drive mechanism for rotating a valve body, a drive unit case made of resin for housing the drive mechanism, and a valve shaft connecting the valve body and the drive mechanism A method,
A method of manufacturing a flow path switching valve, wherein the drive case is joined to the valve body.
The drive part case integrally has a bearing part into which the valve shaft is inserted,
The valve shaft has an annular sealing member that seals a gap with the bearing portion;
The valve body has a valve shaft insertion hole formed such that the valve body rotates as the valve shaft rotates by inserting the valve shaft;
The valve stem has a valve body-side stopper surface that abuts the valve body when the valve shaft is inserted into the valve shaft insertion hole;
The distance from the sealing part of the sealing member in the bearing portion to the end surface on the valve body side is configured to be shorter than the distance from the valve body side stopper surface to the valve body,
Inserting the valve shaft into the valve shaft insertion hole of the valve body housed in the valve chamber until the valve body side stopper surface hits the valve body,
The valve body and the drive unit case are combined so that the valve shaft insertion hole and the bearing portion face each other with a gap therebetween,
Ultrasonic welding or infrared welding of the driving unit case to the valve body in a state where the sealing member is outside the bearing unit,
The valve shaft is moved to the bearing portion side along the axial direction so that the sealing member seals the gap after the drive unit case is welded to the valve body. 11. A method for producing a flow path switching valve according to 11.
The annular wall portion of the drive unit case is inserted in the welding direction inside the peripheral wall portion of the valve body to bring the inner peripheral surface of the peripheral wall portion into contact with the outer peripheral surface of the annular wall portion, and After combining the valve body and the drive unit case so that the length in the welding direction at the contact portion between the inner peripheral surface and the outer peripheral surface of the annular wall portion is 1.5 mm or more, the drive unit case The method for manufacturing a flow path switching valve according to claim 11 or 12, wherein ultrasonic welding or infrared welding is performed on the valve body.