JP2008032197A - Device for opening and closing valve body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for opening and closing a valve body which can prevent the flow of a brazing material over the contact surface of a valve seat with the valve body when the valve seat is assembled by brazing, and can surely perform the opening and closing operation of a flow passage. <P>SOLUTION: When a flow-out pipe 6 and a valve seat 40 mounted to a plate 4 by brazing have been positioned at a mounting hole 12b of the plate 4, a rising portion 41d formed on the valve seat 40 is inserted into the flow-out pipe 6, and the brazing material 90a flowing toward an opening 3b is kept back by means of the rising portion 41d of the valve seat 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a valve body opening / closing device, and more particularly to a valve body opening / closing device that opens and closes a flow path by operating a valve body by driving a motor.

  2. Description of the Related Art Conventionally, a valve body opening / closing device that drives a valve body using a motor as a drive source and opens and closes a refrigerant flow path of a refrigerator or the like is known. For example, in Patent Document 1, when a disk valve provided with an opening is rotated by a motor and the position of the opening of the disk valve matches one of the outlets provided in the valve seat plate, A valve body opening and closing device is described in which the matching outlet is open.

JP 2004-293573 A

  The valve seat used in such a valve body opening / closing device is often attached to the plate of the valve body opening / closing device by brazing, and the wax that flows into the joint surface between the valve body and the plate contacts the valve body. As the surface roughness of the contact surface increases, the sealing of the valve body and valve seat secured by polishing or the like is impeded, or the wax that adheres to the contact surface There is a problem that the contact surface of the valve body with the valve seat is damaged by the edge.

  The problem to be solved by the present invention is to prevent the brazing material from flowing out to the contact surface of the valve seat with the valve body when the valve seat provided at the fluid outflow or inflow opening is attached to the plate by brazing. Then, it is providing the valve body opening / closing apparatus which can perform opening and closing of a flow path reliably.

  In order to solve the above-described problems, the present invention provides, as described in claim 1, an inflow portion into which a fluid can flow, an outflow portion from which a fluid can flow out, and either the inflow portion or the outflow portion. A valve body for opening and closing the flow path, an opening portion for opening and closing the flow path by the valve body, a drive mechanism for operating the valve body to switch the opening portion to an open state or a closed state, and the drive mechanism In the valve body opening / closing device having a motor as a driving source, the opening has a hollow pipe as the inflow portion or the outflow portion, a plate having a mounting hole into which the hollow pipe is inserted, and the hollow inner periphery. A valve seat that has a smaller central hole and that is formed in a ring shape that abuts the valve body on the central hole and closes the central hole. By arranging in the area of the inner periphery, It is disposed across the end surface of the empty pipe and the plate, and has a rising portion protruding from the inner periphery of the central hole to the inner periphery of the pipe. The plate, the pipe, the plate, and the valve seat are low The valve seat, the plate, and the plate are arranged with a gap that can be coupled by attaching, and the rising portion restricts brazing due to brazing from flowing into the contact surface of the valve seat with the valve body. The gist is that the pipe is combined.

  In this case, as described in claim 2, a reservoir portion of the wax is formed over the entire circumference between the outer peripheral surface of the rising portion formed on the inner peripheral edge of the valve seat and the inner wall surface of the pipe. It is desirable that

  According to a third aspect of the present invention, it is preferable that the outer periphery of the valve seat has a size that does not contact the contact surface of the valve body with the valve seat over the entire periphery.

  Furthermore, as described in claim 4, it is better if the periphery of the mounting hole of the plate is formed thicker than other portions.

  And as for Claim 5, it is preferable that the said valve seat is what the said standing | starting-up part was formed by press molding.

  According to a sixth aspect of the present invention, the driving mechanism is configured such that the opening is opened when the valve body is separated from the valve seat, and the valve body is brought into contact with the valve seat. Thus, it is preferable that the opening is closed, and the contact portion of the valve body with the valve seat is formed of an elastic body.

  Furthermore, as described in claim 7, the valve body is engaged with a slope provided on a rotating member that is rotationally driven by the drive source, and the valve seat includes a valve body regulating portion that stands on the valve body side. Preferably, the valve body restricting portion has a detent function for restricting the operation of the valve body along the inclined surface of the rotating member in the axial direction of the rotating member as the rotating member rotates.

  According to the valve element opening and closing device of the present invention, the pipe is inserted into the mounting hole of the plate, the valve seat is disposed on the insertion end face of the pipe, and these are assembled integrally by brazing. At this time, the brazing material flowing in the direction of the opening is blocked by the rising portion provided in the valve seat so as to protrude to the inner periphery of the pipe. For this reason, the wax does not stick to the contact portion of the valve seat with the valve body, the valve body is prevented from being damaged due to repeated opening and closing operations at the opening, and permanent use of the valve body opening / closing device can be expected. . In addition, the flow-off wax increases the surface roughness of the contact portion of the valve seat with the valve body, thereby hindering the sealing between the valve seat and the valve body, and fluid leaks or flows backward when the opening is closed. Can be prevented.

  Further, as in claim 2, a brazing material reservoir is provided between the rising portion formed on the inner peripheral edge of the valve seat and the inner wall surface of the pipe so that excess brazing material is stored in the reservoir. By doing so, the flow of the brazing material toward the opening can be suppressed, and the brazing material can be prevented from adhering to the contact surface of the valve seat with the valve body.

  Further, if the contact surface of the valve body with the valve seat is smaller than the outer peripheral edge of the valve seat as in claim 3, even if the valve seat leaks somewhat from the outer peripheral edge, the fixed solder Since the material and the valve body do not come into contact with each other, the opening / closing operation of the smooth opening of the valve body is not restricted, and the valve body can be prevented from being damaged by the fixed brazing material.

  If the pipe mounting hole is formed thicker than other parts as in claim 4, the joining area of the brazing material between the pipe outer peripheral surface and the inner wall surface of the mounting hole is increased, and the plate and the pipe The joint strength by brazing increases. In addition, it becomes easy to temporarily fix the pipe to the plate before brazing.

  If the rising portion is formed on the inner peripheral edge of the valve body by press molding as in claim 5, the rising portion of the valve seat can be easily formed by burring.

  Further, in the case of a drive mechanism in which the opening and closing state of the fluid opening is switched by repeating the contact state between the valve body and the valve seat as in claim 6, the contact portion of the valve body with the valve seat is elastic. If it is formed of a body, not only the impact with the valve seat of the valve body is mitigated, but also the valve seat is thermally deformed by brazing, and the smoothness at the contact part of the valve seat with the valve body is somewhat Even if it is low, the fluid opening can be reliably closed.

  Further, as in claim 7, if the valve seat integrally has a valve body regulating portion having a rotation preventing function standing on the valve body side, the number of parts is reduced, leading to a reduction in manufacturing cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a valve element opening / closing device 1 according to an embodiment of the present invention, and FIG. 2 is an external perspective view thereof. In addition, the up-down direction in the following description shall show the up-down direction in FIG.

  As shown in these drawings, the valve body opening / closing device 1 of this embodiment includes a bottomed cylindrical main body case 2, a plate 4 attached to the main body case 2, and the plate 4 and the main body case. As an inflow pipe 5 as an inflow part for allowing a fluid to flow into the fluid space 92 formed by 2 through the opening 3a, and as an outflow part for allowing the fluid that has flowed into the fluid space 92 to flow out through the opening 3b Are respectively attached to the plate 4 and disposed.

  In the fluid space 92, at least the valve body 12 that opens and closes the opening 3b of the outflow pipe 6, the drive mechanism 9 that operates the valve body 12 to switch the opening 3b to an open state or a closed state, A valve seat 40 serving as a contact portion of the valve body 12 and a rotor 10 of a stepping motor (hereinafter simply referred to as a motor) 7 which is a drive source of the drive mechanism unit 9 are disposed.

  Each of these members and mechanisms will be described in more detail with reference to FIGS. 3 is an external perspective view showing the configuration inside the main body case 2, and FIG. 4 is an exploded perspective view of the components.

  The main body case 2 is formed by integrally forming a relatively large diameter large diameter cylindrical portion 2a and a relatively small diameter small diameter cylindrical portion 2b by press drawing of a metallic stainless material. A flange portion 2c is formed at the opening edge of the large-diameter cylindrical portion 2a, and the flange portion 2c and the stepped portion 4a of the plate 4 are fixed by TIG (tungsten inert gas) welding, whereby a fluid space 92 is formed. Is formed.

  In the main body case 2, one end of the support shaft 13 is fitted and supported in a recess 20 a formed in the inner bottom wall surface 20 of the main body case 2, and the other end is inserted into the center hole 3 c of the plate 4 to be welded or the like. It is fixed by.

  In the small-diameter cylindrical portion 2b of the main body case 2, the rotor 10 of the motor 7 is rotatably supported on the support shaft 13, and the large-diameter cylindrical portion 2a includes an upper cam member that constitutes the drive mechanism unit 9. 32 and the lower cam member 36 are supported.

  Further, in the rotor 10, an annular magnet (permanent magnet) 17 is supported on a shaft tube portion 16 that is loosely inserted into the support shaft 13 by holding portions 16 a that are provided around both ends of the outer periphery of the shaft tube portion 16. It is provided integrally in a state.

  The drive coils 14 and 14 are wound around the coil bobbins 15 and 15 on the outer peripheral surface of the small-diameter cylindrical portion 2 b of the main body case 2 corresponding to the rotor 10, and the two-layer stator 72 a connected to the connection substrate 74. , 72a is formed. The stator portion 72 is fixed to the stator case 8 so as to surround the outer peripheral surface thereof, and is attached to the outside of the main body case 2.

  Accordingly, the motor 7 has a magnetic attractive force or a magnetic repulsive force between the motor 10 and the magnet 17 due to a magnetic field generated by energizing the drive coils 14 and 14 from the external power supply terminal 76 via the connection board 74. And the rotor 10 is configured to be rotationally driven around the support shaft 13 by a magnetic field.

  On the other hand, an upper cam member 32 and a lower cam member 36 constituting the drive mechanism portion 9 are disposed on the large-diameter cylindrical portion 2a of the main body case 2, and the upper cam member whose details are shown in FIGS. 32, the coupling portion 33 is provided with a coupling groove 33a that is engaged with a coupling protrusion (not shown) formed on the lower end surface of the shaft tube portion 16 of the rotor 10, and is provided below the main body portion 34. On the end face, an upper cam surface 34a formed in a spiral shape, a pressing surface 34b orthogonal to the direction of the support shaft 13 and a bottom surface 34c are formed.

  The lower cam member 36, the details of which are shown in FIGS. 6 and 7, includes a lower cam surface 38a formed on the boundary line between the cylindrical portion 37 and the base portion 38 at the same spiral angle as the upper cam surface 34a. A receiving surface 38b orthogonal to the direction of the shaft 13 and a height holding projection 38c are formed, and a shaft hole 39 into which the support shaft 13 is loosely inserted is formed at the center.

  As shown in FIG. 7, the upper cam member 32 and the lower cam member 36 match the rotational direction positions of the D-cut convex portion 35a and the D-cut concave portion 37a provided on the upper cam member 32 and the lower cam member 36, respectively. When the upper cam member 32 receives rotational power from the rotor 10 due to the engagement between the D-cut convex portion 35a and the D-cut concave portion 37a, the upper cam member is inserted and engaged with the through hole 35 of the upper cam member 32. 32 and the lower cam member 36 rotate together. As for the axial direction, the height holding projection 38c of the lower cam member 36 is brought into contact with the bottom surface 34c of the upper cam member 32, whereby the axial position of the upper cam member 32 is determined.

  At this time, the upper cam surface 34a of the upper cam member 32 and the lower cam surface 38a of the lower cam member 36 are positioned at a predetermined interval without contacting each other. Further, the pressing surface 34b of the upper cam member 32 and the receiving surface 38b of the lower cam member 36 are positioned at the same interval without contacting each other. That is, when the upper cam member 32 and the lower cam member 36 are engaged, as shown in FIG. 1, a substantially spiral cam groove 42 having a constant width is formed.

  On the other hand, as shown in FIG. 8, the valve body 12 engaged with the upper cam member 32 and the lower cam member 36 has a slider portion which is a cylindrical member into which the main body portion 34 of the upper cam member 32 can be loosely inserted. A cam engaging portion 52 that protrudes from the inner wall of 50 and engages with the cam groove 42 formed by the upper cam member 32 and the lower cam member 36 is formed.

  On the other hand, a pad holding portion 54 that is a block-like member having a step is formed to protrude from the outer wall surface of the slider portion 50. The pad 56 that closes the opening 3b is made of urethane rubber, which is an elastic body, and is attached to the valve body 12 by inserting the pad holding portion 54 into the mounting hole, and the pad contact portion 56a is attached to the valve seat 40. To close the opening 3b. In addition, since the stopper 54a is provided in the front-end | tip of the pad holding | maintenance part 54, the pad 56 does not fall out carelessly.

  As shown in FIG. 4, the drive mechanism portion 9 and the valve body 12 having such a configuration are such that the upper cam member 32 is loosely inserted into the support shaft 13 with the coupling portion 33 up, and the shaft tube portion of the rotor 10. 16 and the coupling part 33 are engaged. After the main body portion 34 of the upper cam member 32 is loosely inserted into the slider portion 50 of the valve body 12, the lower cam member 36 is loosely inserted into the support shaft 13, and the upper cam member is placed with the base portion 38 downward. 32 is engaged. As a result, the cam engaging portion 52 of the valve body 12 is engaged with the cam groove 42 formed by the upper cam member 32 and the lower cam member 36.

  Further, as shown in FIG. 3, the pad holding portion 54 and the pad 56 of the engaged valve body 12 are incorporated so as to be positioned between the rotation preventing portions 41 b and 41 b of the valve seat 40 fixed to the plate 4. It is.

  In the valve body opening / closing device 1 configured as described above, when the pad 56 of the valve body 12 is in contact with the opening 3b and the flow path is closed (the state shown in FIG. 1), the rotor 10 is moved to the motor. When rotated counterclockwise when viewed from the 7 side, the upper cam member 32 and the lower cam member 36 are also rotated in conjunction with the rotor 10, and the valve engaged with the cam groove 42 via the cam engaging portion 52. The body 12 receives a force that moves in the upward spiral direction along the cam surface 38 a of the lower cam member 36.

  At that time, the valve body 12 is placed so that the pad holding portion 54 and the pad 56 are positioned between the rotation preventing portions 41b and 41b of the valve seat 40, and therefore the operation of the lower cam member 36 in the rotational circumferential direction is Be regulated. Therefore, as shown in FIG. 9, the valve body 12 moves in the upward direction away from the opening 3 b in parallel with the support shaft 13 that is the rotation shaft, and opens the opening 3 b that is the fluid outlet.

  On the other hand, when the opening 3b is changed from the open state to the closed state, when the rotor 10 is rotated reversely to the above, the upper cam member 32 and the lower cam member 36 are also rotated in conjunction with the rotation of the rotor 10. Then, the valve body 12 engaged with the cam groove 42 via the cam engagement portion 52 receives a force that moves in the downward spiral direction along the cam surface 34a of the upper cam member 32. Become.

  Since the operation of the valve body 12 in the rotational direction is regulated by the rotation preventing portions 41b and 41b of the valve seat 40, the valve body 12 moves in a downward direction to close the opening 3b in parallel with the support shaft 13. The pad 56 is pressed against the valve seat 40, and the opening 3b is closed.

  As described above, the valve seat 40 serving as a contact surface of the valve body 12 when the opening 3b is closed is brazed to the plate 4 together with the above-described outflow pipe 6 while performing the function of preventing the valve body 12 from rotating. (Hereinafter simply referred to as brazing). FIG. 10 shows a cross-sectional view of the opening 3b that is the fluid outlet formed in the plate 4. As shown in FIG. Since this brazing operation is performed with the valve seat 40 positioned on the lower surface of the plate 4, FIG. 10 is shown upside down from FIG.

  As shown in FIG. 10A, the outflow pipe 6 is loosely inserted into the mounting hole 12b so that the surface of the plate 4 on the fluid space 92 side and the end edge 6a thereof are aligned. On the other hand, the valve seat 40 integrally formed by press molding has positioning holes 41c and 41c formed in the base 41, and two positioning projections 4a provided on the plate 4 in the positioning holes 41c and 41c. , 4a are fitted, and the rising portion 41d of the burring hole 41a enters the inner peripheral side of the outflow pipe 6 and is positioned.

  In this state, the outflow pipe 6 and the valve seat 40 are temporarily fixed to the brazing jig while maintaining a gap that can be brazed between the plate 4 and the flux is applied so as to penetrate the respective joint surfaces. . A ring-shaped nickel brazing material (hereinafter simply referred to as a brazing material) 90 is dropped from the tip of the outflow pipe 6 and placed on the boundary line between the outflow pipe 6 and the plate 4 and then brazed in a heating furnace. The material 90 is heated.

  When the brazing material 90a melted by this heating process flows into the gap between the outer peripheral surface of the outflow pipe 6 and the mounting hole 12b as shown in FIG. It branches into the gap between the seat 40 and the plate 4 and the gap between the valve seat 40 and the end edge 6 a of the outflow pipe 6. Here, the brazing material 90a flowing between the valve seat 40 and the plate 4 flows to the outer peripheral edge 40a of the valve seat 40 by capillary action, and the valve seat 40 is fixed to the plate 4.

  On the other hand, the brazing material 90a flowing between the valve seat 40 and the end edge 6a of the outflow pipe 6 flows in the direction of the opening 3b, but the flow is blocked by the rising portion 41d of the burring hole 41a. Therefore, the brazing material 90a does not flow down from the opening 3b and adhere to the surface 41b of the valve seat 40.

  In the present embodiment, a reservoir 93 that can store a certain amount of brazing material 90 a is formed between the rising portion 41 d and the inner wall of the outflow pipe 6. The brazing material 90a is prevented from rising by capillary action and flowing out from the opening 3a. In addition, a certain amount of brazing material 90a is stored in the pool portion 93, thereby suppressing the brazing material 90a from flowing in the direction of the opening 3b.

  On the other hand, as is clear from FIGS. 1, 9, etc., the pad 56 provided on the valve body 12 has a contact portion 56 a formed smaller than the valve seat 40. This is because the brazing material 90a, which is restrained from flowing in the direction of the opening 3b by the brazing material 90a stored in the pool portion 93, is forced to flow in the direction of the outer peripheral edge 40a of the valve seat 40. Often flows out from the outer peripheral edge 40a and adheres to the vicinity thereof, so that the pad 56 of the valve body 12 is prevented from being damaged by the edge of the adhered wax.

  Further, as can be seen from FIG. 10, since the attachment hole 12b is formed in the thick portion 13b of the plate 4, the contact area between the outer peripheral surface of the outflow pipe 6 and the inner wall surface of the attachment hole 12b is large. Therefore, it becomes easy to temporarily fix the outflow pipe 6 to the plate 4 before brazing, and the brazing strength between the plate 4 and the outflow pipe 6 is high.

  Thus, according to the valve element opening / closing device 1 according to the present embodiment, when the valve seat 40 disposed on the outflow pipe 6 and the insertion end surface thereof is brazed into the mounting hole 12b of the plate 4, the valve seat Since the rising portion 41d provided in 40 enters the inner peripheral side of the outflow pipe 6 and the brazing material 90a flowing in the direction of the opening 3b is blocked by the rising portion 41d of the valve seat 40, the valve in the valve seat 40 The wax flows out to the surface of the contact portion with the body 12, the surface roughness of the contact portion increases, and the flow path cannot be closed, or the valve body 12 is damaged and damaged by the edge of the flowed-out wax. Can be prevented.

  Further, since a reservoir portion 93 that can store a certain amount of brazing material 90a is formed between the rising portion 41d provided in the valve seat 40 and the inner wall of the outflow pipe 6, the brazing material 90a is used as the valve seat. Therefore, it is possible to prevent the pad 56 of the valve body 12 coming into contact with the valve seat 40 from being damaged due to the wax sticking to the vicinity of the opening 3b.

  Furthermore, in this embodiment, the pad 56 provided in the valve body 12 has a contact portion 56a formed smaller than the valve seat 40, and a brazing material is fixed to the vicinity of the outer peripheral edge 40a of the valve seat 40. However, the pad 56 of the valve body 12 is not damaged.

  Moreover, since the attachment hole 12b to which the outflow pipe 6 is brazed and fixed is formed in the thick portion 13b of the plate 4, the contact area between the outer peripheral surface of the outflow pipe 6 and the inner wall surface of the attachment hole 12b is large. Temporary fixing of the outflow pipe 6 to the plate 4 before brazing is facilitated, and the brazing strength can be increased.

  Further, the valve seat 40 has a simple shape and can be integrally formed by press molding. This leads to a reduction in manufacturing cost, and the rising portion 41d of the valve seat 40 that suppresses the flow of the brazing material is also formed by burring. It can be easily formed. Furthermore, in the case of the conventional technology in which the valve body and the valve seat are slid in surface contact, when the valve seat 40 is formed by pressing, the valve seat 40 needs to have high smoothness by polishing or the like. In the present embodiment, the valve body 12 is a valve body operation structure in which the valve body 12 moves directly with respect to the opening 3b which is a fluid outlet, and the pad 56 is made of urethane rubber which is an elastic body, so Even if it does not do, the opening part 3b can be sealed reliably.

  Further, in the present embodiment, the valve seat 40 with which the pad 56 of the valve body 12 abuts is provided with the anti-rotation portions 41b and 41b, and the valve seat and the anti-rotation function are shared by one component. The manufacturing cost can be reduced.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the process of brazing the outflow pipe 6 and the valve seat 40 to the plate 4, a ring-shaped brazing material 90 is placed on the boundary line between the outflow pipe 6 and the plate 4, and the brazing material 90 is placed in a heating furnace. Although it has been described that the melting is performed in the furnace, it goes without saying that the technical idea of the present application can be applied even when this brazing is performed manually.

  In the brazing process, the brazing material 90a is introduced from the boundary line between the plate 4 and the outflow pipe 6. However, even if the brazing material 90a is introduced from the outer peripheral edge 40a of the valve seat 40, the brazing material 90a is opened by the rising portion 41d. Leakage of the brazing material 90a flowing in the direction of the portion 3b can be prevented, and the same effect as in the above embodiment can be obtained.

  Moreover, although the said embodiment demonstrated that the pad 56 with which the valve body 12 was equipped was made from urethane rubber, if it has elasticity and can seal the opening part 3b reliably, it will be restricted to it is not.

  Furthermore, in the said embodiment, the valve body 12 which opens and closes a flow path was provided only in the opening part 3b which is a fluid outflow port, and the brazing process of the outflow pipe 6 and the valve seat 40 in the said location was demonstrated. The present invention may be applied to a valve body opening / closing device that controls the opening and closing of the inlet, and may also be applied to a valve body opening / closing device that controls the opening and closing of both the outlet and the inlet. Further, the present invention can be applied to a valve body opening / closing device having a plurality of outlets and inlets.

It is sectional drawing of the valve body opening / closing apparatus which concerns on one embodiment of this invention. It is an external appearance perspective view of the valve body opening / closing apparatus shown in FIG. It is the external appearance perspective view which showed the structure in the main body case of a valve body opening / closing apparatus. It is a disassembled perspective view of the component in the main body case shown in FIG. It is an external appearance perspective view of the upper cam member which is a component of a drive mechanism part. It is an external appearance perspective view of the lower cam member which is a component of a drive mechanism part. It is an external appearance perspective view for demonstrating engagement of an upper cam member and a lower cam member. It is an external appearance perspective view of the valve body which opens and closes the opening part which is an outflow port of a fluid. It is sectional drawing of the state by which the opening part which is an outflow port of a fluid was open | released. It is sectional drawing which showed the flow of the brazing material at the time of brazing and fixing an outflow pipe and a valve seat to a plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve body opening / closing apparatus 4 Plate 6 Outflow pipe 7 Motor 9 Drive mechanism part 10 Rotor 12 Valve body 12b Mounting hole 13b Thick part 40 Valve seat 41a Burring hole 41d Rising part 41b, 41b Non-rotating part 56 Pad 90 Brazing material in front)
90a brazing material (after melting)
93 pool

Claims (7)

An inflow part through which fluid can flow in, an outflow part through which fluid can flow out, a valve body for opening and closing either the inflow part or the outflow part, and the flow path is opened and closed by the valve body A valve body opening and closing device, a drive mechanism that operates the valve body to switch the opening to an open state or a closed state, and a valve body opening and closing device that includes a motor that is a drive source of the drive mechanism.
The opening has a hollow pipe as the inflow part or the outflow part, a plate having a mounting hole into which the hollow pipe is inserted, and a central hole smaller than the hollow inner periphery, and the valve is provided in the central hole. A valve seat formed in a ring shape that contacts a body and closes the central hole, and the valve seat is formed by disposing the central hole in a region of an inner periphery of the pipe. The center hole has a rising portion that protrudes from the inner periphery of the pipe, and the plate, the pipe, the plate, and the valve seat are brazed by brazing. It is arranged with a gap that can be joined,
The valve seat, the plate, and the pipe are coupled to each other in a state where brazing due to brazing is restricted from flowing into the contact surface of the valve seat with the valve body by the rising portion. Valve body opening and closing device.   2. The reservoir of the wax is formed over the entire circumference between the outer peripheral surface of the rising portion formed on the inner peripheral edge of the valve seat and the inner wall surface of the pipe. Valve body opening and closing device.   The valve body opening / closing device according to claim 1 or 2, wherein the outer periphery of the valve seat is of a size that does not contact the contact surface of the valve body with the valve seat over the entire circumference.   The valve body opening and closing device according to claim 1, wherein a periphery of the mounting hole of the plate is formed to be thicker than other portions.   The valve body opening / closing device according to claim 1, wherein the valve seat has the rising portion formed by press molding.   The drive mechanism is configured such that the opening is opened when the valve body is separated from the valve seat, and the opening is closed when the valve body is in contact with the valve seat. The valve body opening / closing device according to claim 1, wherein a contact portion of the valve body with the valve seat is formed of an elastic body. The valve body is engaged with an inclined surface provided on a rotating member that is rotationally driven by the drive source, the valve seat has a valve body restricting portion that stands on the valve body side, and the valve body restricting portion is the rotating member. The valve body opening / closing function according to claim 1, further comprising a rotation preventing function for restricting an operation of the valve body along an inclined surface of the rotating member in an axial direction of the rotating member as the member rotates. apparatus.

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