CN114576413A

CN114576413A - Valve device

Info

Publication number: CN114576413A
Application number: CN202111321495.4A
Authority: CN
Inventors: 吉冈大辉; 小山祐; 剑持大一郎; 横田健久
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2020-12-02
Filing date: 2021-11-09
Publication date: 2022-06-03
Anticipated expiration: 2041-11-09
Also published as: JP2022088126A; CN114576413B; JP7425715B2

Abstract

The invention provides a valve device capable of ensuring sealing performance and reducing the usage amount of welding flux. The solenoid valve (1A) is provided with a valve seat member (4) that is separate from the valve body (2), and an annular recessed portion (243) is formed on the unseated side surface (241) of the valve body (2). Thus, the molten solder can be easily stored in the recess (243), and the amount of solder required can be reduced as compared with a structure in which the solder is caused to permeate all around the outer periphery of the flange portion and the inner peripheral surface of the valve main body 2. Thus, the amount of solder used can be reduced while ensuring the sealing property.

Description

Valve device

Technical Field

The present invention relates to a valve device.

Background

In general, as a valve device for opening and closing a flow path, an electromagnetic valve is known in which a plunger is driven by an electromagnet to move a valve element. In such a valve device, abrasion and noise may occur due to collision of the valve element with the valve seat. For the purpose of reducing such wear and noise, improving the machining accuracy of a contact portion with the valve element, and the like, there has been proposed a solenoid valve including a valve body formed with a valve chamber, and a valve element receiver formed with a valve port and a valve seat as separate members from the valve body (see, for example, patent document 1). In the solenoid valve described in patent document 1, a valve body and a valve body receiver, which are independent members, are fixed by brazing.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ] Japanese patent laid-open publication No. 2019-124240

Disclosure of Invention

[ problem to be solved by the invention ]

However, in the solenoid valve described in patent document 1, the solder is arranged on the outlet port side of the valve main body, and the solder penetrates to surround the entire outer periphery of the flange portion, so that the amount of the solder used is likely to increase. On the other hand, if the amount of solder used is to be reduced, it is difficult for the solder to surround the entire outer periphery of the flange portion, and the sealing property may be reduced.

The invention aims to provide a valve device which can ensure sealing performance and reduce the using amount of welding flux.

[ MEANS FOR SOLVING PROBLEMS ] A method for solving the problems

A valve device according to the present invention opens and closes a flow path between a first port to which a first joint is connected and a second port to which a second joint is connected by seating or unseating a valve element on or from a valve seat, the valve device including: the valve body, it moves straight to the side of sitting on or leaving the seat; a valve body having the first port and the second port, and having a valve chamber for accommodating the valve body; a valve seat member formed separately from the valve main body and having a valve port communicating with the second port and the valve seat formed therein; and a drive unit that drives the valve body, the valve body including: an inserted portion into which a part of the valve seat member is inserted from the unseated side; and a unseated side surface formed around the inserted portion and facing the unseated side, the valve seat member including: an insertion portion into which the inserted portion is inserted; and a flange portion having an opposing surface opposing the unseated side surface and disposed so as to cover the unseated side surface, wherein an annular recess is formed in at least one of the unseated side surface and the opposing surface so as to surround the valve port.

According to the present invention, the annular recessed portion is formed in at least one of the free seat side surface and the facing surface facing each other, so that the molten solder can be easily retained in the recessed portion. This makes it possible to easily perform brazing over the entire circumference so as to surround the valve port while fixing the valve main body and the valve seat member, and to suppress leakage of fluid at the connection portion between the valve main body and the valve seat member. In this case, the maximum outer diameter of the recess portion can be made smaller than the diameter of the flange portion, and the amount of solder required can be reduced as compared with a structure in which solder is caused to permeate through the entire circumference between the outer circumference of the flange portion and the inner circumferential surface of the valve main body. Thus, the amount of solder used can be reduced while ensuring the sealing property.

In this case, in the valve device according to the present invention, it is preferable that the recess portion having an exposed portion exposed from the flange portion when viewed from the unseated side is formed in the unseated side surface, and the exposed portion is formed in an annular shape or formed at a plurality of circumferential positions. With this configuration, the brazing state in the recess can be visually confirmed from the unseated side. In this case, the exposed portion is formed in an annular shape or formed at a plurality of circumferential positions, and it can be confirmed whether or not brazing is properly performed over the entire or substantially the entire circumferential direction in the annular recessed portion, and a decrease in sealing performance due to the partial absence of the brazing material can be suppressed.

In the valve device according to the present invention, it is preferable that the recessed portion of the unseated side surface has an outer diameter larger than an outer diameter of the flange portion, and the exposed portion is formed in an annular shape. With this configuration, it is possible to easily confirm whether or not brazing is properly performed over the entire circumferential direction of the recess.

In the valve device of the present invention, it is preferable that the outer peripheral surface of the flange portion includes: a disposition portion disposed in the recess of the side surface of the separation seat; and a protruding portion protruding from the arrangement portion to an outer peripheral side of the arrangement portion. According to this configuration, the solder before melting can be arranged along the outer periphery of the arrangement portion, and sandwiched between the bottom surface of the recess and the protruding portion, and workability during soldering can be improved.

In the valve device according to the present invention, it is preferable that a groove for communicating the space on the seat-separated side and the space on the seat-seated side is formed in an inner peripheral surface of the inserted portion, the groove opens into the recessed portion at an end on the seat-separated side, the flange portion has a regulating portion disposed in the recessed portion for regulating insertion into the inserted portion, and the regulating portion regulates insertion into the inserted portion while regulating insertion into the inserted portion by a dimension of protrusion from the inner peripheral surface of the inserted portion when inserted into the inserted portion being smaller than a depth of the groove of the recessed portion. According to this configuration, the molten solder can be caused to pass from the recessed portion to the groove or from the groove to the recessed portion, and the solder can be easily caused to permeate therethrough.

In the valve device according to the present invention, the flange portion may include a plurality of large diameter portions and small diameter portions, the small diameter portions may have an outer diameter smaller than an outer diameter of the recess portion of the unseated side surface, and the large diameter portions may have an outer diameter larger than an outer diameter of the recess portion of the unseated side surface. With this configuration, the maximum outer diameter of the flange portion can be ensured. Thus, for example, the outer peripheral surface of the large diameter portion can be disposed close to or in contact with the inner peripheral surface of the valve main body, and the valve seat member can be prevented from rattling with respect to the valve main body.

In the valve device according to the present invention, it is preferable that the drive unit includes a plunger, a suction tool, and an exciting coil, and the valve device functions as an electromagnetic valve.

[ Effect of the invention ]

According to the valve device of the present invention, the amount of solder used can be reduced while ensuring the sealing property.

Drawings

Fig. 1 is a sectional view of a valve device according to a first embodiment of the present invention.

Fig. 2 is an enlarged sectional view of a main portion of the valve device.

Fig. 3 is a sectional view showing a main part of the valve device in a further enlarged manner.

Fig. 4 is a cross-sectional view showing a state before brazing of the valve device.

Fig. 5 is a sectional view of a main portion of a valve device according to a second embodiment of the present invention.

Fig. 6 is a plan view showing a flange portion of the valve device.

Fig. 7 is a cross-sectional view showing a state before brazing of the valve device.

Fig. 8 is a sectional view showing a main part of a valve device according to a modification of the present invention.

In the figure:

1A-an electromagnetic valve (valve device), 2-a valve body, 21-a first port, 22-a second port, 23-a valve chamber, 241-an unseated side surface, 243-a concave portion, 25-an inserted portion, 3-a valve body, 4-a valve seat member, 41-an inserted portion, 42, 45, 46-a flange portion, 421, 461-an opposed surface, 423-an arrangement portion, 424-a protruding portion, 451-a large diameter portion, 452-a small diameter portion, 462-a concave portion, 5-a drive unit, a1, a 2-an exposed portion.

Detailed Description

Embodiments of the present invention will be described with reference to the accompanying drawings. In the second embodiment, the same reference numerals are given to the components common to the first embodiment, and the description thereof is omitted.

[ first embodiment ]

As shown in fig. 1 and 2, a solenoid valve 1A of the present embodiment is a valve device that opens and closes a flow path between a first joint 101 and a second joint 102, and includes a valve main body 2, a valve body 3, a valve seat member 4, and a drive unit 5.

In the solenoid valve 1A, the spool 3 is set to move straight in a predetermined direction. Hereinafter, the direction of the linear movement of the valve body 3 is defined as the Z direction, the side where the valve body 3 moves so as to close the valve is defined as the seating side (lower side in fig. 1), and the side where the valve body 3 moves so as to open the valve is defined as the unseated side (upper side in fig. 1). Two directions orthogonal to the Z direction are referred to as an X direction and a Y direction. The Z direction is sometimes referred to as a separating side or a seating side, and may be abbreviated as above or below, and when not particularly described, the top and bottom are based on fig. 1.

The valve main body 2 is made of metal such as brass, and has a first port 21 connected to the first joint 101 and a second port 22 connected to the second joint 102. In the present embodiment, the first port 21 is an inlet port (primary side), and the second port 22 is an outlet port (secondary side). A valve chamber 23 that communicates with the first port 21 and the second port 22 and accommodates the spool 3 is formed in the valve main body 2. The valve chamber 23 also accommodates a lower end portion of a plunger 512 described later. The valve main body 2 is not limited to brass, and may be made of stainless steel, for example.

The valve main body 2 is formed in a cylindrical shape extending in the Z direction as a whole, and has a convex portion 24 protruding toward the inner peripheral side between the second port 22 and the valve chamber 23. Thereby, an inserted portion 25 having a smaller diameter than the second port 22 is formed inside the convex portion 24. An insertion portion 41, which will be described later, which is a part of the valve seat member 4 is inserted into the inserted portion 25 from the unseated side. The surface of the projection 24 facing the unseating side is an unseating side surface 241, and the unseating side surface 241 is formed around the inserted portion 25. Further, a spiral groove 242 having an axial direction in the Z direction is formed in the inner peripheral surface of the convex portion 24 (i.e., the inner peripheral surface of the inserted portion 25). The groove 242 is formed to communicate the space (valve chamber 23) on the unseated side of the inserted portion 25 with the space (second port 22) on the seated side of the inserted portion 25. Further, the unseated end of the spiral groove 242 opens to a recess 243 described later, and the groove 242 and the recess 243 can communicate with each other.

The valve body 3 is formed into a spherical shape from a metal such as stainless steel, is held by a valve body holder 514 described later, and moves linearly in the Z direction to open and close a valve port 43 described later.

The valve seat member 4 is formed as a member (independent member) independent of the valve main body 2 from a metal such as stainless steel, and has an insertion portion 41 and a flange portion 42, and a valve port 43 and a valve seat 44 communicating with the second port 22 are formed. The material of the valve seat member 4 may be appropriately selected according to the required wear resistance, hardness, impact absorption, and the like, and for example, the valve body 2 may be made of brass having excellent workability and the valve seat member 4 may be made of stainless steel having excellent durability, although the material may be resin according to the material of the valve body 3 and the valve holder 514 described later. The insertion portion 41 is formed in a circular shape when viewed from the Z direction, and is pressed (inserted) into the inserted portion 25 from the unseated side, and is disposed with its lower end portion close to the upper end portion of the second joint 102.

The flange portion 42 is formed in a circular shape when viewed from the Z direction, and has an outer diameter larger than the inner diameter of the inserted portion 25, so that it cannot be inserted into the inserted portion 25. In a state where the insertion portion 41 of the valve seat member 4 is inserted into the inserted portion 25, the flange portion 42 is arranged so as to cover the unseating side surface 241 of the valve main body 2 from the unseating side, and the lower surface (surface on the unseating side) thereof is an opposing surface 421 opposing the unseating side surface 241 in the Z direction.

The valve port 43 is formed to penetrate the entire valve seat member 4 in the Z direction, and thereby communicates with the second port 22. Further, a valve seat 44 is formed on a surface (an upper surface of the flange portion 42) on the unseated side of the valve seat member 4, and the valve body 3 is seated on or unseated from the valve seat 44. The through-shaped valve port 43 has an orifice 431 as a portion of the valve port 43 having the smallest inner diameter.

The drive unit 5 is constituted by a plunger unit 51 and a solenoid assembly 52. The plunger unit 51 has a plunger tube 511, a plunger 512, an attraction member 513, a spool holder 514, and a coil spring 515.

The plunger tube 511 is a cylindrical member formed of, for example, metal, and is hermetically connected to an upper opening (an opening on the seat-separated side) of the valve main body 2. The plunger 512 is a movable iron core slidable in the Z direction inside the plunger tube 511. The plunger 512 has a plunger chamber 512A as an opening on the free seat side, a pressure equalizing hole 512B as a through hole in the Z direction, and a lower end hollow portion 512C as an opening provided on the seated seat side. The plunger 512 has a pressure equalizing hole 512B in the Z direction and a lower end hollow portion 512C, and thus the plunger chamber 512A and the valve chamber 23 communicate with each other through a through hole 514A described later to equalize the pressure.

The suction piece 513 is a fixed iron core fixed to the unseated side end portion of the plunger tube 511. The coil spring 515 is disposed inside the plunger chamber 512A of the plunger 512, connected to the plunger 512 and the suction member 513, and compression-mounted so as to generate a biasing force in a closing direction on the valve element 3.

The valve element holder 514 is made of metal such as stainless steel, is a substantially cylindrical member fixed to a seating-side end of the plunger 512, is provided in the valve chamber 23, and holds the valve element 3 therein. A through hole 514A in the XY in-plane direction is formed near the Z-direction middle section of the spool holder 514. Accordingly, the interior of the valve body holder 514 communicates with the valve chamber 23, and high-pressure fluid acts on the valve body 3 from the seating side before the valve body 3 contacts the valve seat 44, so that the valve body 3 easily closes the valve port 43 by this pressure difference.

A valve spring 6 is compression-fitted into the lower hollow portion 512C of the plunger 512. The valve spring 6 is connected to the plunger 512 and biases the valve element 3 toward the seat side.

The electromagnetic coil assembly 52 has: a resin bobbin 521 concentrically attached to the plunger tube 511, a coil 522 wound around the bobbin 521 and exciting the plunger 512 and the suction piece 513, a case 523 formed by covering the bobbin 521 around which the coil 522 is wound with a resin and accommodating them inside, a bolt 524 for fixing the case 523 to the suction piece 513, and a lead wire 525 connected to the coil 522.

The solenoid valve 1A of the present embodiment is a normally closed solenoid valve, and in a normal state (non-energized state), the plunger 512 is pushed downward by the urging force of the coil spring 515 connected to the suction element 513, and the valve body 3 is seated and pressed against the valve seat 44 of the valve seat member 4 by the urging force of the valve spring 6 connected to the plunger 512, and the solenoid valve 1A is in a closed state.

On the other hand, when the coil 522 is energized from the lead wire 525 to be in an energized state, the suction piece 513 and the plunger 512 are excited. As a result, a suction force exceeding the biasing force of the coil spring 515 is generated between the suction member 513 and the plunger 512, the valve element holder 514 fixed to the plunger 512, and the spherical valve element 3 held by the valve element holder 514 move to the unseated side. The valve body 3 moves away from the valve seat 44 by moving to the unseating side, the valve seat 44 is opened, and the solenoid valve 1A is opened. Accordingly, the fluid flowing in from the first joint 101 passes through the first port 21, the valve chamber 23, and the valve port 43, and is discharged from the second joint 102.

When the current supply from the lead wire 525 to the coil 522 is stopped and the normal state is again achieved, the attraction piece 513 and the plunger 512 can be demagnetized (or demagnetized), and the attraction force between the attraction piece 513 and the plunger 512 can be eliminated (or reduced). As a result, the valve body 3 moves toward the seating side by the biasing force of the coil spring 515, the valve body 3 is seated on the valve seat 44, and the solenoid valve 1A is closed again.

Here, the fixing structure of the valve main body 2 and the valve seat member 4 formed as separate bodies (independent members) from each other will be described in detail with reference to fig. 3. As described above, the unseated side surface 241 of the valve main body 2 and the facing surface 421 of the valve seat member 4 face each other in the Z direction. An annular recess 243 is formed in the unseated side surface 241 of the opposing surfaces so as to surround the valve port 43. That is, the insertion portion 41 of the valve seat member 4 in which the valve port 43 is formed is disposed inside the convex portion 24 in which the unseated side surface 241 is formed, and the concave portion 243 surrounds the valve port 43 from the outside.

The flange 42 has a restriction portion 422 formed to have a diameter larger than that of the portion of the inserted portion 25 other than the groove 242 and to abut against the bottom surface of the recess 243. The excessive insertion of the valve seat member 4 into the inserted portion 25 is restricted by the restriction portion 422. The outer peripheral surface of the flange portion 42 has an arrangement portion 423 and a protruding portion 424. The arrangement portion 423 is a cylindrical surface extending from the restriction portion 422 toward the seat side, has a dimension in the Z direction larger than the depth of the concave portion 243, and is arranged in the concave portion 243. The protruding portion 424 protrudes from the arrangement portion 423 toward the seat side to the outer peripheral side of the arrangement portion 423 and is arranged outside the recessed portion 243.

The circular flange 42 has a maximum diameter at the protruding portion 424 when viewed in the Z direction, and the outer diameter of the protruding portion 424 is larger than the outer diameter of the recess 243 formed in the off-seat side surface 241. That is, the recessed portion 243 has an exposed portion a1 exposed from the flange portion 42, as viewed from the unseated side in the Z direction. The flange portion 42 and the recess portion 243 are formed concentrically, and the exposed portion a1 is formed annularly.

The groove 242 is formed in the inner circumferential surface, and the dimension (radius) between the center of the spiral and the deepest position of the groove is referred to as the maximum inner diameter. That is, the maximum inner diameter is the inner diameter (radius) of the inserted portion 25 plus the depth of the groove 242. The groove 242 has a substantially constant maximum inner diameter, i.e. a substantially constant groove depth, throughout its spiral. In the cross-sections of fig. 2 and 3, the groove 242 located in the recessed portion 243 is not shown, and the portion having the largest inner diameter of the two grooves 242 (one on each of the left and right sides) is shown on the seating side. In the cross section of fig. 2 and 3 rotated by a predetermined angle in the Z-axis direction, the groove 242 has the largest inner diameter in the recess 243. The radius (outer diameter) of the restricting portion 422 is smaller than the maximum inner diameter of the groove 242 in the recessed portion 243, and the restricting portion 422 and the groove 242 are concentrically arranged. In other words, the dimension of the restricting portion 422 protruding from the inner peripheral surface of the inserted portion 25 is smaller than the depth of the groove 242 with respect to the inner peripheral surface of the inserted portion 25. Therefore, the opening of the groove 242 is not completely covered by the restricting portion 422 but partially exposed in the recess 243. Thus, the regulating portion 422 regulates the insertion into the inserted portion 25, and communicates the groove 242 with the recess 243.

Next, a method of fixing the valve main body 2 and the valve seat member 4 will be described. The valve main body 2 and the valve seat member 4 are fixed by brazing in a direction in which the unseated side is the upper side in the vertical direction. First, as shown in fig. 4, solder 10 is disposed in the concave portion 243. At this time, a part of the solder 10 is sandwiched from the Z direction by the bottom surfaces of the protruding portion 424 and the recessed portion 243 so that the solder 10 is along the outer periphery of the arrangement portion 423 of the flange portion 42 (a part of the solder overlaps the protruding portion 424 in the Z direction). In this way, the solder 10 is stably held by the protruding portion 424.

When the solder 10 is melted, a part of the melted solder remains in the recessed portion 243, and the other part moves downward in the vertical direction by gravity, and penetrates into the gap between the valve main body 2 and the valve seat member 4. At this time, the molten solder easily passes through the spiral groove 242. The solder remaining in the recessed portion 243 is annular along the recessed portion 243.

Thus, the solder remaining in the recess 243 is solidified, and the valve chamber 23 and the second joint 102 are not communicated at this position. That is, by appropriately retaining the solder in the recessed portion 243, the valve chamber 23 communicates with the second joint 102 only via the valve port 43.

According to the present embodiment described above, the annular recessed portion 243 is formed in the unseated side surface 241, so that the molten solder can be easily retained in the recessed portion 243. This makes it possible to easily perform brazing over the entire circumference so as to surround the valve port 43 while fixing the valve body 2 and the valve seat member 4, and to suppress leakage of fluid at the connection portion between the valve body 2 and the valve seat member 4. In this case, the maximum outer diameter of the recess 243 can be made smaller than the diameter of the flange 42, and the amount of solder required can be reduced as compared with a structure in which solder is caused to permeate all around the outer periphery of the flange and the inner peripheral surface of the valve main body 2. Therefore, the amount of solder used can be reduced while ensuring the sealing property.

Since the recessed portion 243 has the exposed portion a1, the state of brazing in the recessed portion 243 can be visually confirmed from the unseated side, and a reduction in sealing performance due to the partial absence of solder can be suppressed. Further, since the recessed portion 243 is formed in an annular shape, it is possible to easily confirm whether or not the brazing is properly performed over the entire circumferential direction of the recessed portion.

Further, since the outer peripheral surface of the flange portion 42 has the arrangement portion 423 and the protruding portion 424, the solder 10 before melting can be arranged so as to follow the outer periphery of the arrangement portion 423, and the bottom surface of the recess 243 and the protruding portion 424 sandwich therebetween, and workability at the time of brazing can be improved.

Further, when the restriction portion 422 of the flange portion 42 restricts the insertion into the inserted portion 25, the groove 242 and the recessed portion 243 communicate with each other, so that the molten solder can pass from the recessed portion 243 to the groove 242, and the solder can easily penetrate.

[ second embodiment ]

As shown in fig. 5, the solenoid valve of the present embodiment is different from the solenoid valve 1A of the first embodiment in the point and brazing method using a seat member 4B instead of the seat member 4.

The valve seat member 4B has an insertion portion 41 and a flange portion 45, and is formed of a valve port 43 having an orifice 431 and a valve seat 44. As shown in fig. 6, the flange portion 45 has three large diameter portions 451 and three small diameter portions 452, which are alternately arranged in the circumferential direction. Each of the large diameter portion 451 and the small diameter portion 452 is formed in a range of 60 ° as viewed in the Z direction, but the large diameter portion and the small diameter portion may be different in range, or the large diameter portion and the small diameter portion may be different in range. The large diameter portion 451 has an outer diameter larger than that of the recess 243. The small diameter portion 452 has an outer diameter larger than the inner diameter of the inserted portion 25 and smaller than the outer diameter of the recessed portion 243.

By forming such a small diameter portion 452, the recessed portion 243 has an exposed portion a2 exposed from the flange portion 45 when viewed from the unseated side. The exposed portions a2 are formed at three circumferential positions.

Next, a method of fixing the valve main body 2 and the valve seat member 4B will be described. The valve main body 2 and the seat member 4 are fixed by brazing in a direction in which the seating side is the upper side in the vertical direction. First, as shown in fig. 7, the solder 10 is disposed in the insertion portion 41 of the valve seat member 4. In this case, as shown in the drawing, it is preferable that a stepped portion having a small diameter is formed on the tip end side (seating side) of the insertion portion 41, and the solder 10 is held by the stepped portion (along the outer periphery of the small diameter portion).

The solder 10 melts and moves downward in the vertical direction by gravity, and penetrates into the gap between the valve main body 2 and the valve seat member 4B. At this time, the molten solder easily passes through the spiral groove 242. A part of the solder infiltrated into the gap between the valve main body 2 and the valve seat member 4B reaches the recessed portion 243, and is retained in the recessed portion 243 in an annular shape.

According to the present embodiment described above, as in the first embodiment, the annular recessed portion 243 is formed in the unseated side surface 241, whereby the amount of solder used can be reduced while securing the sealing property. Further, since the recessed portion 243 has the exposed portion a2, the state of brazing in the recessed portion 243 can be visually confirmed from the side away from the seat.

Further, since the flange portion 45 has the large diameter portion 451 and the small diameter portion 452, the maximum outer diameter of the flange portion 45 can be secured. This allows the outer peripheral surface of the large diameter portion 451 to be disposed close to the inner peripheral surface of the valve main body 2, and thus prevents the valve seat member 4 from rattling with respect to the valve main body 2.

The present invention is not limited to the above-described embodiments, and includes other configurations and the like that can achieve the object of the present invention, and modifications and the like described below also belong to the present invention. For example, in the first and second embodiments, the recessed portion 243 is formed in the unseating side surface 241 of the opposed unseating side surface 241 and the opposed surface 421, but a recessed portion may be formed in the opposed surface. For example, as shown in fig. 8, a valve seat member 4C having an insertion portion 41 and a flange portion 46 having a recessed portion 462 formed on an opposing surface 461 may be used. In the embodiment shown in fig. 8, as in the second embodiment, brazing may be performed in a direction in which the seating side is the upper side in the vertical direction.

According to such a configuration, as in the first and second embodiments, the recessed portion 462 is formed, whereby the amount of solder used can be reduced while ensuring the sealing property. In addition, when the valve seat member 4C is formed of a material softer than the valve main body 2, the recess portion is easily formed. Further, since it is not necessary to form a recess in the valve main body 2, it is not necessary to change the design of the valve main body 2.

Further, as in the first and second embodiments, the recessed portion may be formed on the free seat side surface, and as in a modification of fig. 8, the recessed portion may be formed on the facing surface.

In the first embodiment, the flange portion 42 has the arrangement portion 423 and the protruding portion 424 on the outer peripheral surface thereof, but when the solder can be stably held by the size, shape, relationship with the recess, and the like of the solder before melting, the flange portion may not have the arrangement portion and the protruding portion.

In the first and second embodiments, the recessed portion 243 formed in the unseated side surface 241 has the exposed portions a1 and a2, but a recessed portion may be formed in the unseated side surface and may not have an exposed portion. According to such a configuration, it is not necessary to process the flange portion to form the exposed portion, and the shape of the valve seat member can be simplified and the design change of the valve seat member can be omitted.

In the first embodiment, the solenoid valve 1A includes the drive unit 5 including the plunger unit 51 and the solenoid assembly 52, but may be a valve device including another drive unit.

In the first embodiment, the spiral groove 242 is formed in the inner peripheral surface of the inserted portion 25, and the restricting portion 422 of the flange portion 42 restricts the insertion into the inserted portion 25 and communicates the groove 242 and the recessed portion 243, but the present invention is not limited to such a configuration. That is, the groove formed in the inserted portion is not limited to a spiral shape, and for example, a linear groove extending in the linear movement direction of the valve body and an annular groove formed in a ring shape around the linear movement direction of the valve body may be combined. In this case, the groove may be completely covered with the restricting portion, and a communication hole for communicating the recess with the groove may be provided by additional processing. In addition, when the molten solder is likely to penetrate between the valve body and the valve seat member depending on the size, material, and the like of the valve body and the valve seat member, a groove such as a spiral groove may not be formed in the inner peripheral surface of the inserted portion.

While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention is also included in modifications of the design without departing from the scope of the present invention.

Claims

1. A valve device that opens and closes a flow path between a first port to which a first joint is connected and a second port to which a second joint is connected by seating or unseating a valve element on or from a valve seat, the valve device comprising:

the valve body, it moves to the side of sitting on or leaving the seat straightly;

a valve body having the first port and the second port, and having a valve chamber for accommodating the valve body formed therein;

a valve seat member formed separately from the valve main body and having a valve port communicating with the second port and the valve seat; and

a drive unit for driving the valve core,

the valve main body includes: an inserted portion into which a part of the valve seat member is inserted from the unseated side; and a seat-separating side surface formed around the inserted portion and facing the seat-separating side,

the valve seat member includes: an insertion portion into which the inserted portion is inserted; and a flange portion having an opposed surface opposed to the unseated side surface and disposed so as to cover the unseated side surface,

an annular recess is formed in at least one of the unseated side surface and the facing surface so as to surround the valve port.

2. The valve device according to claim 1,

the recess having an exposed portion exposed from the flange portion when viewed from the unseated side is formed in the unseated side surface,

the exposed portion is formed in an annular shape or formed at a plurality of circumferential positions.

3. The valve device according to claim 2,

the outer diameter of the recess portion of the unseated side surface is formed larger than the outer diameter of the flange portion, and the exposed portion is formed in an annular shape.

4. The valve device according to claim 3,

the outer peripheral surface of the flange portion has: a disposition portion disposed in the recess of the side surface of the separation seat; and a protruding portion protruding from the arrangement portion to an outer peripheral side of the arrangement portion.

5. A valve device according to any one of claims 2 to 4,

a groove for communicating the space on the separate seat side with the space on the seat side is formed in the inner peripheral surface of the inserted portion,

the groove opens into the recess at the end on the seat-separating side,

the flange portion has a restriction portion disposed in the recess portion for restricting insertion into the inserted portion,

the restriction portion is configured to have a dimension protruding from an inner peripheral surface of the inserted portion when inserted into the inserted portion smaller than a depth of the groove of the recessed portion, and to allow the groove and the recessed portion to communicate with each other while restricting insertion into the inserted portion.

6. The valve device according to claim 2,

the flange portion has a plurality of large diameter portions and small diameter portions,

the outer diameter of the small diameter portion is formed to be smaller than the outer diameter of the recess of the off-seat side surface, and the outer diameter of the large diameter portion is formed to be larger than the outer diameter of the recess of the off-seat side surface.

7. The valve device according to any one of claims 1 to 6,

the drive unit has a plunger, a suction member, and an excitation coil,

functions as a solenoid valve.