JP7425715B2 - valve device - Google Patents

Description

The present invention relates to a valve device.

Generally, 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 body. In such a valve device, wear and noise may occur due to the valve body colliding with the valve seat. In order to reduce these wear and noise and to improve the machining accuracy of the contact part with the valve body, the valve body where the valve chamber is formed is a separate part from the valve body, and the valve port and An electromagnetic valve including a valve body receiver in which a valve seat is formed has been proposed (see, for example, Patent Document 1). In the solenoid valve described in Patent Document 1, the valve body and the valve body holder, which are separate parts, are fixed by brazing.

JP2019-124240A

However, in the solenoid valve described in Patent Document 1, the brazing material is placed on the outlet port side of the valve body, and the brazing material is allowed to penetrate the entire outer periphery of the flange. The amount of brazing filler metal used tends to increase. On the other hand, if an attempt is made to reduce the amount of brazing filler metal used, it becomes difficult for the brazing filler metal to wrap around the entire outer periphery of the flange portion, which may result in a decrease in sealing performance.

An object of the present invention is to provide a valve device that can reduce the amount of brazing filler metal used while ensuring sealing performance.

The valve device of the present invention opens and closes a flow path between a first port connected to a first joint and a second port connected to a second joint by seating or unseating a valve body on a valve seat. A valve device comprising: a valve body that moves straight toward a seated side or an unseated side; a valve body having a first port and a second port; and a valve chamber for accommodating the valve body; , comprising: a valve port formed separately from the valve body and communicating with the second port; a valve seat member in which the valve seat is formed; and a driving means for driving the valve body; The valve body includes an inserted portion into which a part of the valve seat member is inserted from the unseated side, and a recessed side surface formed around the inserted portion and facing the unseated side. The valve seat member includes an insertion portion that is inserted into the inserted portion, and a flange portion that has a facing surface that faces the seating side surface and is arranged to cover the seating side surface. An annular recess is formed in at least one of the seating side surface and the opposing surface so as to surround the valve port.

According to the present invention as described above, since the annular recess is formed in at least one of the seating side surface and the opposing surface that face each other, it is possible to easily hold the molten brazing material in this recess. can. This makes it easy to secure the valve body and the valve seat member while brazing them all around the valve port, thereby suppressing fluid leakage at the connection between the valve body and the valve seat member. can. At this time, the maximum outer diameter of the recess can be made smaller than the diameter of the flange, and compared to a structure in which the brazing material permeates the entire circumference between the outer circumference of the flange and the inner circumferential surface of the valve body. The amount of brazing filler metal required can be reduced. Therefore, the amount of brazing filler metal used can be reduced while ensuring sealing performance.

In this case, in the valve device of the present invention, the recessed portion having an exposed portion exposed from the flange portion when viewed from the unseated side is formed on the unseated side, and the exposed portion is formed in an annular shape. Alternatively, it is preferable that they are formed at multiple locations in the circumferential direction. According to such a configuration, the state of the brazing inside the recess can be visually confirmed from the unseating side. At this time, the exposed portion is formed in an annular shape or in multiple locations in the circumferential direction, so that it can be checked whether brazing is properly performed over the entire circumferential direction or substantially the entire circumferential direction in the annular recessed portion. This makes it possible to suppress the deterioration in sealing performance due to the local absence of the brazing filler metal.

Further, in the valve device of the present invention, it is preferable that the outer diameter of the recessed portion of the seating side surface is larger than the outer diameter of the flange portion, so that the exposed portion is formed in an annular shape. According to such a configuration, it is possible to more easily confirm whether brazing is appropriately performed over the entire circumferential direction of the recessed portion.

Further, in the valve device of the present invention, the outer circumferential surface of the flange portion includes an arrangement portion disposed within the recess of the seating side surface, and an arrangement portion disposed on the seating release side and an outer peripheral side of the arrangement portion. It is preferable to have a protruding protrusion. According to this configuration, the brazing material before melting can be placed along the outer periphery of the placement part and sandwiched between the bottom surface of the recess and the protrusion, improving workability during brazing. be able to.

Further, in the valve device of the present invention, a groove is formed in the inner circumferential surface of the inserted portion to communicate the space on the unseated side and the space on the seating side, and the groove is formed on the inner circumferential surface of the inserted part, and the groove The end portion opens into the recess, and the flange portion has a restriction portion disposed within the recess to restrict insertion into the inserted portion, and the restriction portion is inserted into the insertion portion. At this time, since the protruding dimension of the inserted part from the inner circumferential surface is smaller than the depth of the groove in the recess, the groove and the recess are communicated while restricting insertion into the inserted part. It is preferable to let According to such a configuration, the molten brazing material can pass from the recess to the groove or from the groove to the recess, making it easier for the brazing material to penetrate.

Further, in the valve device of the present invention, the flange portion has a plurality of large diameter portions and a plurality of small diameter portions, and the outer diameter of the small diameter portion is smaller than the outer diameter of the recessed portion of the seating side surface, and The exposed portion may be formed at a plurality of locations in the circumferential direction by forming the outer diameter of the large diameter portion to be larger than the outer diameter of the recessed portion of the seating side surface. According to such a configuration, the maximum outer diameter of the flange portion can be ensured. Thereby, for example, the outer circumferential surface of the large diameter portion can be arranged so as to be close to or in contact with the inner circumferential surface of the valve body, and it is possible to suppress rattling of the valve seat member with respect to the valve body.

Moreover, in the valve device of the present invention, it is preferable that the driving means has a plunger, an attractor, and an exciting coil, and functions as a solenoid valve.

According to the valve device of the present invention, it is possible to reduce the amount of brazing filler metal used while ensuring sealing performance.

FIG. 1 is a sectional view showing a valve device according to a first embodiment, which is an example of the present invention. FIG. 3 is an enlarged cross-sectional view showing a main part of the valve device. It is a sectional view further enlarging and showing the main part of the valve device. It is a sectional view showing the state before brazing of the valve device. It is a sectional view showing the main part of the valve device concerning a 2nd embodiment which is an example of the present invention. FIG. 3 is a plan view showing a flange portion of the valve device. It is a sectional view showing the state before brazing of the valve device. It is a sectional view showing the main part of the valve device concerning the modification of the present invention.

Embodiments of the present invention will be described with reference to the drawings. Note that, in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[First embodiment]
As shown in FIGS. 1 and 2, the solenoid valve 1A of this 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 body 2, a valve body 3, , a valve seat member 4 , and a driving means 5 .

In the electromagnetic valve 1A, the valve body 3 is provided to move straight in a predetermined direction. In the following, the direction of straight movement of the valve body 3 is referred to as the Z direction, the side where the valve body 3 moves to close the valve is referred to as the seating side (lower side in FIG. 1), and the side where the valve body 3 moves to open the valve is referred to as the seating side. The side where the seat is seated is the unseating side (the upper side in FIG. 1). Further, two directions orthogonal to the Z direction are defined as an X direction and a Y direction. When describing the Z direction, it may be referred to as the unseating side or the seating side, or simply the upper and lower sides, but unless otherwise specified, the upper and lower directions are based on FIG. 1.

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

The entire valve body 2 is formed in a cylindrical shape extending along the Z direction, and has a convex portion 24 that protrudes toward the inner circumference between the second port 22 and the valve chamber 23 . As a result, 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 and is a part of the valve seat member 4, is inserted into the inserted portion 25 from the unseating side. The surface of the convex portion 24 facing the unseated side becomes a unseated side surface 241 , and the unseated side surface 241 is formed around the inserted portion 25 . Further, a spiral groove 242 whose axial direction is in the Z direction is formed on the inner circumferential surface of the convex portion 24 (that is, the inner circumferential surface of the inserted portion 25). The groove 242 is formed so as to communicate the space (valve chamber 23) on the unseated side of the inserted part 25 with the space (second port 22) on the seated side of the inserted part 25. Further, the end of the spiral groove 242 on the unseated side opens into a recess 243, which will be described later, so that the groove 242 and the recess 243 can communicate with each other.

The valve body 3 is made of metal such as stainless steel and has a spherical shape, and is held by a valve body holder 514, which will be described later, and opens and closes a valve port 43, which will be described later, by moving straight in the Z direction.

The valve seat member 4 is formed separately (separate part) from the valve 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 that communicates with the second port 22. A valve seat 44 is formed. The material of the valve seat member 4 may be appropriately selected depending on the required wear resistance, hardness, shock absorption, etc. For example, depending on the material of the valve body 3 and the valve body holder 514 described later, resin However, as mentioned above, it is preferable that the valve body 2 is made of brass, which has excellent workability, and the valve seat member 4 is made of stainless steel, which has excellent durability. The insertion part 41 is formed in a circular shape when viewed from the Z direction, is press-fitted (inserted) into the inserted part 25 from the unseating side, and is arranged so that its lower end is close to the upper end of the second joint 102. Ru.

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. When the insertion portion 41 of the valve seat member 4 is inserted into the inserted portion 25, the flange portion 42 is arranged to cover the unseated side surface 241 of the valve body 2 from the unseated side, and also covers the lower surface ( (seating side surface) becomes an opposing surface 421 that faces the unseating side surface 241 in the Z direction.

The valve port 43 is formed to penetrate the entirety of the valve seat member 4 in the Z direction, thereby communicating with the second port 22 . Further, the valve seat 44 is formed on the surface of the valve seat member 4 on the unseated side (the upper surface of the flange portion 42), and the valve body 3 is configured to be seated on or removed from the valve seat 44. ing. Further, the penetrating valve port 43 has an orifice 431 having the smallest inner diameter.

The driving means 5 is composed of a plunger unit 51 and an electromagnetic coil assembly 52. Plunger unit 51 includes plunger tube 511, plunger 512, suction element 513, valve body holder 514, and coil spring 515.

The plunger tube 511 is a cylindrical member made of, for example, metal, and is airtightly connected to the upper opening (opening on the unseated side) of the valve body 2. The plunger 512 is a movable core that can slide in the Z direction within the plunger tube 511. The plunger 512 has a plunger chamber 512A that is an opening on the unseating side, a pressure equalizing hole 512B that is an internal through hole in the Z direction, and a lower end hollow part 512C that is an opening provided on the seating side. It is formed. By forming the pressure equalization hole 512B in the Z direction and the lower end hollow part 512C in the plunger 512, the plunger chamber 512A and the valve chamber 23 are communicated with each other via the through hole 514A, which will be described later, and the pressure is equalized.

The suction element 513 is a fixed core fixed to the end of the plunger tube 511 on the unseating side. The coil spring 515 is arranged inside the plunger chamber 512A of the plunger 512, is connected to the plunger 512 and the suction element 513, and is compressed so as to generate a biasing force in the direction of closing the valve body 3.

The valve body holder 514 is made of metal such as stainless steel, and is a substantially cylindrical member fixed to the seating end of the plunger 512. keeping. A through hole 514A extending in the XY plane is formed near the middle stage of the valve body holder 514 in the Z direction. As a result, the inside of the valve body holder 514 and the valve chamber 23 communicate with each other, and immediately before the valve body 3 contacts the valve seat 44, high pressure fluid acts on the valve body 3 from the seating side. 3 makes it easier to close the valve port 43 due to the pressure difference.

A valve spring 6 is compressed inside the lower end hollow portion 512C of the plunger 512. The valve spring 6 is connected to the plunger 512 and biases the valve body 3 toward the seating side.

The electromagnetic coil assembly 52 includes a resin bobbin 521 that is attached concentrically to the plunger tube 511, a coil 522 that is wound around the bobbin 521, and that excites the plunger 512 and the attractor 513. It has a casing 523 that accommodates the rear bobbin 521 by covering it with resin, a bolt 524 that fixes the casing 523 to the suction element 513, and a lead wire 525 that is connected to the coil 522.

The solenoid valve 1A of this 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 attractor 513. The valve body 3 is seated and pressed against the valve seat 44 of the valve seat member 4 by the biasing force of the valve spring 6 connected to the plunger 512, and the solenoid valve 1A is brought into a closed state.

On the other hand, when the coil 522 is energized from the lead wire 525 and becomes energized, the attractor 513 and the plunger 512 are excited. As a result, a suction force is generated between the suction element 513 and the plunger 512, and this suction force exceeds the biasing force of the coil spring 515, causing the plunger 512, the valve body holder 514 fixed to the plunger 512, and the valve body The spherical valve body 3 held by the holder 514 moves to the unseating side. The valve body 3 is moved to the unseated side, thereby being unseated from the valve seat 44, the valve seat 44 is opened, and the solenoid valve 1A is placed in an open state. Thereby, 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.

If the power supply from the lead wire 525 to the coil 522 is stopped to return to the normal state, the attractor 513 and the plunger 512 can be demagnetized (or demagnetized), and the attraction force between the attractor 513 and the plunger 512 is reduced. disappears (or decreases). As a result, the valve body 3 is moved to the seating side by the urging force of the coil spring 515 in the same manner as described above, the valve body 3 is seated on the valve seat 44, and the solenoid valve 1A is again in the closed state.

Here, details of the fixing structure between the valve body 2 and the valve seat member 4, which are formed as separate bodies (separate parts) from each other, will be explained with reference to FIG. 3 as well. As described above, the unseating side surface 241 of the valve body 2 and the opposing surface 421 of the valve seat member 4 face each other in the Z direction. An annular recess 243 is formed on the seating side surface 241 of these two 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 arranged inside the convex portion 24 in which the seating side surface 241 is formed, and the recess 243 surrounds the valve port 43 from the outside. .

The flange portion 42 has a regulating portion 422 that is formed to have a larger diameter than the portion of the inserted portion 25 excluding the groove 242 and comes into contact with the bottom surface of the recess 243 . The restricting portion 422 restricts excessive insertion of the valve seat member 4 into the inserted portion 25 . The outer peripheral surface of the flange portion 42 has a placement portion 423 and a protrusion portion 424 . The arrangement part 423 is a cylindrical surface extending from the regulating part 422 toward the unseating side, has a dimension in the Z direction larger than the depth of the recess 243 , and is arranged in the recess 243 . Further, the protruding portion 424 protrudes toward the outer periphery of the arranging portion 423 on the unseating side than the arranging portion 423 and is arranged outside the recess 243 .

The flange portion 42, which is circular when viewed in the Z direction, has the largest diameter at the protrusion 424, and the outer diameter of the protrusion 424 is larger than the outer diameter of the recess 243 formed in the seating side surface 241. That is, the recessed portion 243 has an exposed portion A1 exposed from the flange portion 42 when viewed from the unseating side in the Z direction. The flange portion 42 and the recessed portion 243 are formed in a concentric shape, and the exposed portion A1 is formed in an annular shape.

The groove 242 is formed on the inner peripheral surface, and the dimension (radius) between the center of the spiral and the deepest position of the groove is called 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. Groove 242 has a substantially constant maximum inner diameter, ie, a substantially constant groove depth, throughout its helix. In the cross-sections of FIGS. 2 and 3, the groove 242 located in the recess 243 is not shown, and two parts of the groove 242 with the maximum inner diameter are shown on the seating side (one on the left and one on the left). ing. In a cross section obtained by rotating FIGS. 2 and 3 by a predetermined angle around the Z-axis direction, the groove 242 has a maximum inner diameter within 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 recess 243, and the restricting portion 422 and the groove 242 are arranged concentrically. In other words, the protrusion dimension of the restricting portion 422 from the inner circumferential surface of the inserted portion 25 is smaller than the depth of the groove 242 based on the inner circumferential surface of the inserted portion 25 . Therefore, in the recess 243, the opening of the groove 242 is not completely covered by the restricting part 422, but is partially exposed. This allows the groove 242 and the recess 243 to communicate with each other while the regulating portion 422 regulates insertion into the inserted portion 25 .

Next, a method of fixing the valve body 2 and the valve seat member 4 will be explained. The valve body 2 and the valve seat member 4 are fixed by brazing with the unseated side facing upward in the vertical direction. First, as shown in FIG. 4, the brazing material 10 is placed in the recess 243. At this time, the brazing material 10 is placed along the outer periphery of the placement portion 423 in the flange portion 42, and a portion of the brazing material 10 is sandwiched between the protrusion 424 and the bottom surface of the recess 243 from the Z direction (the brazing material 10 is (The protrusion 424 partially overlaps with the protrusion 424.) In this way, the brazing material 10 is stably held by the protrusion 424.

By melting the brazing filler metal 10, a part of the melted brazing filler metal stays in the recess 243, and the other part moves downward in the vertical direction due to gravity, thereby causing the valve body 2 and the valve seat member 4 to penetrate into the gap between At this time, the molten brazing material easily passes through the spiral groove 242. Furthermore, the brazing material remaining in the recess 243 forms an annular shape along the recess 243 .

As the brazing material accumulated in the recess 243 solidifies in this manner, the valve chamber 23 and the second joint 102 are no longer communicated with each other at this position. That is, by appropriately storing the brazing material in the recess 243, the valve chamber 23 communicates with the second joint 102 only through the valve port 43.

According to the present embodiment described above, by forming the annular recess 243 in the seating side surface 241, it is possible to easily hold the molten brazing material in the recess 243. This makes it easy to braze the entire circumference of the valve port 43 while fixing the valve body 2 and the valve seat member 4, thereby preventing fluid leakage at the connecting portion between the valve body 2 and the valve seat member 4. can be suppressed. At this time, the maximum outer diameter of the recess 243 can be made smaller than the diameter of the flange part 42, and the brazing material can be infiltrated throughout the entire circumference between the outer circumference of the flange part and the inner circumferential surface of the valve body 2. In comparison, the amount of brazing filler metal required can be reduced. Therefore, the amount of brazing filler metal used can be reduced while ensuring sealing performance.

Since the concave portion 243 has the exposed portion A1, the state of brazing in the concave portion 243 can be visually confirmed from the unseated side, and a decrease in sealing performance due to local absence of the brazing material can be suppressed. Furthermore, since the recess 243 is formed in an annular shape, it is possible to more easily confirm whether brazing is properly performed over the entire circumferential direction of the recess.

Furthermore, since the outer circumferential surface of the flange portion 42 has the arrangement portion 423 and the protrusion 424, the brazing material 10 before melting can be arranged along the outer circumference of the arrangement portion 423, and the bottom surface of the recess 243 and the protrusion 424, and workability during brazing can be improved.

Further, when the regulating part 422 of the flange part 42 regulates insertion into the inserted part 25, the groove 242 and the recess 243 communicate with each other, so that the molten brazing material passes from the recess 243 to the groove 242. This makes it easier for the brazing filler metal to penetrate.

[Second embodiment]
As shown in FIG. 5, the solenoid valve of this embodiment is different from the solenoid valve 1A of the first embodiment in that a valve seat member 4B is used instead of the valve seat member 4, and in the brazing method. differ.

The valve seat member 4B has an insertion portion 41 and a flange portion 45, and is also formed with 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 arranged alternately in the circumferential direction. It is assumed that each of the large diameter portion 451 and the small diameter portion 452 is formed within a range of 60° when viewed from the Z direction, but the range may be different between the large diameter portion and the small diameter portion, or the large diameter portion and the small diameter portion may have different ranges. The range may be different between sections or between small diameter sections. The outer diameter of the large diameter portion 451 is larger than the outer diameter of the recess 243. The outer diameter of the small diameter portion 452 is 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 unseating side. The exposed portions A2 are formed at three locations in the circumferential direction.

Next, a method of fixing the valve body 2 and the valve seat member 4B will be explained. The valve body 2 and the valve seat member 4 are fixed by brazing with the seating side facing upward in the vertical direction. First, as shown in FIG. 7, the brazing material 10 is placed in the insertion portion 41 of the valve seat member 4. At this time, as shown in the figure, a stepped portion is formed in the insertion portion 41 with a smaller diameter on the tip side (seating side), and the brazing material 10 is held by this stepped portion (the brazing material is placed around the outer periphery of the small diameter portion). It is preferable that the

By melting the brazing filler metal 10, it moves vertically downward by gravity and penetrates into the gap between the valve body 2 and the valve seat member 4B. At this time, the molten brazing material easily passes through the spiral groove 242. A portion of the brazing material that has penetrated into the gap between the valve body 2 and the valve seat member 4B reaches the recess 243 and remains in the recess 243, forming an annular shape.

According to the present embodiment, as in the first embodiment, the annular recess 243 is formed in the seating side surface 241, thereby reducing the amount of brazing filler metal used while ensuring sealing performance. Can be done. Moreover, since the recessed portion 243 has the exposed portion A2, the state of the brazing inside the recessed portion 243 can be visually confirmed from the unseating side.

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 ensured. Thereby, the outer circumferential surface of the large diameter portion 451 can be arranged close to the inner circumferential surface of the valve body 2, and wobbling of the valve seat member 4 with respect to the valve body 2 can be suppressed.

Note that the present invention is not limited to the embodiments described above, and includes other configurations that can achieve the object of the present invention, and the present invention also includes the following modifications. For example, in the first embodiment and the second embodiment, the recess 243 is formed in the seating side surface 241 of the opposing seating surface 241 and the opposing surface 421, but the recess 243 is formed in the opposing surface. may be formed. For example, as shown in FIG. 8, a valve seat member 4C having an insertion portion 41 and a flange portion 46 in which a recess 462 is formed in an opposing surface 461 may be used. In the form shown in FIG. 8, similarly to the second embodiment, brazing may be performed with the seating side facing upward in the vertical direction.

According to this configuration, as in the first embodiment and the second embodiment, since the recess 462 is formed, it is possible to reduce the amount of brazing filler metal used while ensuring sealing performance. . Further, when the valve seat member 4C is made of a material softer than the valve body 2, it is easy to form a recessed portion. Further, since there is no need to form a recess in the valve body 2, there is no need to change the design of the valve body 2.

Incidentally, a recess may be formed on the side surface of the seating area as in the first embodiment and the second embodiment, and a recess may be formed on the opposing surface as in the modification shown in FIG.

Further, in the first embodiment, the outer circumferential surface of the flange portion 42 has the arrangement portion 423 and the protruding portion 424, but depending on the size and shape of the brazing material before melting, the relationship with the recess, etc. If the flange part can be stably held, the flange part does not need to have the arrangement part and the protrusion part.

In addition, in the first embodiment and the second embodiment, the recess 243 formed on the seating side surface 241 has the exposed parts A1 and A2, but the recess is formed on the seating side surface and this recess It is also possible to have a configuration in which the electrode does not have an exposed portion. With this configuration, there is no need to process the flange portion to form the exposed portion, and the shape of the valve seat member can be simplified and design changes of the valve seat member can be omitted.

Further, in the first embodiment, the solenoid valve 1A includes the driving means 5 composed of the plunger unit 51 and the electromagnetic coil assembly 52, but the valve device may include other driving means.

Further, in the first embodiment, the spiral groove 242 is formed on the inner peripheral surface of the inserted portion 25, and the regulating portion 422 of the flange portion 42 restricts insertion into the inserted portion 25, and the groove 242 Although it is assumed that the recess 243 is in communication with the recess 243, the structure is not limited to this. That is, the groove formed in the inserted part is not limited to a spiral groove, and for example, a linear groove extending along the rectilinear movement direction of the valve body, and an annular groove formed in an annular shape around the rectilinear movement direction of the valve body. You may also combine grooves. Further, the groove may be completely covered by the regulating portion, and in such a configuration, a communication hole that communicates the recess and the groove may be provided by additional machining. In addition, if the molten brazing filler metal easily penetrates between the valve body and valve seat member due to their dimensions and materials, do not form a spiral groove on the inner circumferential surface of the inserted part. It's okay.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention.

1A... Solenoid valve (valve device), 2... Valve body, 21... First port, 22... Second port, 23... Valve chamber, 241... Seating side surface, 243... Recessed part, 25... Inserted part, 3... Valve Body, 4... Valve seat member, 41... Insertion part, 42, 45, 46... Flange part, 421, 461... Opposing surface, 423... Arrangement part, 424... Projection part, 451... Large diameter part, 452... Small diameter part, 462... recessed part, 5... driving means, A1, A2... exposed part

Claims (8)

A valve device that opens and closes a flow path between a first port connected to a first joint and a second port connected to a second joint by seating or unseating a valve body on a valve seat,
the valve body that moves straight to the seating side or the unseating side;
a valve body having the first port and the second port, and in which a valve chamber for accommodating the valve body is formed;
a valve port formed separately from the valve body and communicating with the second port, and a valve seat member in which the valve seat is formed;
A driving means for driving the valve body,
The valve body includes an inserted part into which a part of the valve seat member is inserted from the unseated side, and an unseated side surface formed around the inserted part and facing the unseated side. have,
The valve seat member has an insertion portion that is inserted into the inserted portion, and a flange portion that has a facing surface that faces the seating side surface and is arranged to cover the seating side surface,
An annular recess is formed in at least one of the seating side surface and the opposing surface so as to surround the valve port ,
The valve device is characterized in that an outer edge of the recess is located inside an outer edge of the seating side surface . A valve device that opens and closes a flow path between a first port connected to a first joint and a second port connected to a second joint by seating or unseating a valve body on a valve seat,
the valve body that moves straight to the seating side or the unseating side;
a valve body having the first port and the second port, and in which a valve chamber for accommodating the valve body is formed;
a valve port formed separately from the valve body and communicating with the second port, and a valve seat member in which the valve seat is formed;
A driving means for driving the valve body,
The valve body includes an inserted part into which a part of the valve seat member is inserted from the unseated side, and an unseated side surface formed around the inserted part and facing the unseated side. have,
The valve seat member has an insertion portion that is inserted into the inserted portion, and a flange portion that has a facing surface that faces the seating side surface and is arranged to cover the seating side surface,
An annular recess is formed in at least one of the seating side surface and the opposing surface so as to surround the valve port,
The recessed portion having an exposed portion exposed from the flange portion when viewed from the seating side is formed on the seating side,
The valve device is characterized in that the exposed portion is formed in an annular shape or is formed in a plurality of locations in a circumferential direction. 3. The valve device according to claim 2, wherein the outer diameter of the recessed portion of the seating surface is larger than the outer diameter of the flange portion, so that the exposed portion is formed in an annular shape. . The outer circumferential surface of the flange portion has a placement portion disposed within the recess of the seating release side, and a protrusion portion that protrudes further outward than the placement portion on the release side from the placement portion. The valve device according to claim 3, characterized in that: A groove is formed on the inner circumferential surface of the inserted portion to communicate the space on the unseating side and the space on the seating side,
The groove opens into the recess at the end on the release side,
The flange portion has a restriction portion disposed within the recess to restrict insertion into the inserted portion;
When the restricting portion is inserted into the inserted portion, the protruding dimension from the inner circumferential surface of the inserted portion is smaller than the depth of the groove in the recess, thereby preventing insertion into the inserted portion. The valve device according to any one of claims 2 to 4, characterized in that the groove and the recess are allowed to communicate with each other while being regulated. The flange portion has a plurality of large diameter portions and a plurality of small diameter portions,
The outer diameter of the small diameter portion is formed to be smaller than the outer diameter of the recess on the seating side, and the outer diameter of the large diameter portion is larger than the outer diameter of the recess on the seating side. 3. The valve device according to claim 2, wherein the exposed portion is formed at a plurality of locations in the circumferential direction. A valve device that opens and closes a flow path between a first port connected to a first joint and a second port connected to a second joint by seating or unseating a valve body on a valve seat,
the valve body that moves straight to the seating side or the unseating side;
a valve body having the first port and the second port, and in which a valve chamber for accommodating the valve body is formed;
a valve port formed separately from the valve body and communicating with the second port, and a valve seat member in which the valve seat is formed;
A driving means for driving the valve body,
The valve body includes an inserted part into which a part of the valve seat member is inserted from the unseated side, and an unseated side surface formed around the inserted part and facing the unseated side. have,
The valve seat member has an insertion portion that is inserted into the inserted portion, and a flange portion that has a facing surface that faces the seating side surface and is arranged to cover the seating side surface,
A valve device characterized in that an annular recess is formed in the opposing surface so as to surround the valve port. The driving means includes a plunger, an attractor, and an exciting coil,
The valve device according to any one of claims 1 to 7 , characterized in that it functions as a solenoid valve.

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