JP2022088126A - Valve device - Google Patents

Abstract

To provide a valve device capable of reducing a use amount of a brazing material while securing sealability.SOLUTION: A solenoid valve 1A comprises a valve seat member 4 separate from a valve body 2, and an annular recess 243 is formed on a detached side surface 241 of the valve body 2. This makes it easier to fasten a molten brazing material to the recess 243, and an amount of a brazing material required can be reduced as compared with the configuration in which the brazing material permeates the entire circumference between the entire outer peripheral surface of a flange part and the inner peripheral surface of the valve body 2. Therefore, it is possible to reduce an amount of the brazing material used while securing sealability.SELECTED DRAWING: Figure 2

Description

The present invention relates to a valve device.

Generally, as a valve device for opening and closing a flow path, a solenoid valve that moves a valve body by driving a plunger with an electromagnet is known. In such a valve device, wear and noise may occur due to the collision of the valve body with the valve seat. For the purpose of reducing these wear and noise and improving the processing accuracy of the contact part with the valve body, the valve body in which the valve chamber is formed and the valve body are separate parts, and the valve port and the valve body A solenoid valve including a valve body receiver having a valve seat formed therein 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 receiver, which are separate parts from each other, are fixed by brazing.

Japanese Unexamined Patent Publication No. 2019-124240

However, in the solenoid valve described in Patent Document 1, the brazing filler metal is arranged on the outlet port side of the valve body, and the brazing filler metal is infiltrated so that the brazing filler metal wraps around the entire outer periphery of the flange portion. The amount of brazing material used tended to increase. On the other hand, when trying to reduce the amount of the brazing material used, it becomes difficult for the brazing material to wrap around the entire outer periphery of the flange portion, and there is a possibility that the sealing performance is deteriorated.

An object of the present invention is to provide a valve device capable of reducing the amount of brazing filler metal used while ensuring hermeticity.

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

According to the present invention as described above, since an annular recess is formed in at least one of the seating side surfaces facing each other and the facing surface, it is possible to easily fasten the molten brazing material in the recess. can. As a result, while fixing the valve body and the valve seat member, it is easy to braze over the entire circumference so as to surround the valve port, and it is possible to suppress fluid leakage at the connection portion 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 portion, and compared with the configuration in which the brazing material permeates the entire circumference between the outer circumference of the flange portion and the inner peripheral surface of the valve body. The amount of brazing material required can be reduced. Therefore, it is possible to reduce the amount of the brazing material used while ensuring the sealing property.

At this time, in the valve device of the present invention, is the recess having an exposed portion exposed from the flange portion when viewed from the seating side formed on the seating side surface, and is the exposed portion formed in an annular shape? Alternatively, it is preferably formed at a plurality of locations in the circumferential direction. With such a configuration, the state of brazing in the recess can be visually recognized from the seated side. At this time, it is determined whether the exposed portions are formed in an annular shape or at a plurality of locations in the circumferential direction, so that the annular recesses are appropriately brazed over the entire circumferential direction or substantially the entire circumference. It can be confirmed, and the deterioration of the sealing property due to the local absence of the brazing material can be suppressed.

Further, in the valve device of the present invention, it is preferable that the exposed portion is formed in an annular shape by forming the outer diameter of the recess on the side surface of the seat to be larger than the outer diameter of the flange portion. With such a configuration, it is possible to make it easier to confirm whether brazing is properly performed over the entire circumferential direction of the recess.

Further, in the valve device of the present invention, the outer peripheral surface of the flange portion is arranged in the recess of the seating side surface, and on the seating side of the seating portion and on the outer peripheral side of the seating portion. It is preferable to have a protruding portion. According to such a configuration, the brazing material before melting can be arranged along the outer periphery of the arranging portion and can be sandwiched between the bottom surface of the recess and the protruding portion, improving workability at the time of brazing. be able to.

Further, in the valve device of the present invention, a groove is formed on the inner peripheral surface of the inserted portion to communicate the space on the seating side and the space on the seating side, and the groove is formed on the seating side. The flange portion is arranged in the recess and has a restricting portion that restricts insertion into the inserted portion, and the restricting portion is inserted into the inserted portion. At that time, the protrusion dimension from the inner peripheral surface of the inserted portion is smaller than the depth of the groove in the recess, so that the groove and the recess are communicated with each other while restricting insertion into the inserted portion. It is preferable to let it. According to such a configuration, the molten brazing material can pass from the recess to the groove or from the groove to the recess, and the brazing material can be easily permeated.

Further, in the valve device of the present invention, the flange portion has a plurality of large diameter portions and small diameter portions, and the outer diameter of the small diameter portion is formed to be smaller than the outer diameter of the recess on the side surface of the detached seat. Since the outer diameter of the large diameter portion is formed to be larger than the outer diameter of the recess on the side surface of the seat, the exposed portions may be formed at a plurality of locations in the circumferential direction. According to such a configuration, the maximum outer diameter of the flange portion can be secured. Thereby, for example, the outer peripheral surface of the large diameter portion can be arranged so as to be close to or in contact with the inner peripheral surface of the valve body, and rattling of the valve seat member with respect to the valve body can be suppressed.

Further, 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 an electromagnetic valve.

According to the valve device of the present invention, the amount of brazing filler metal used can be reduced while ensuring hermeticity.

It is sectional drawing which shows the valve device which concerns on 1st Embodiment which is an example of this invention. It is sectional drawing which shows the main part of the valve device in an enlarged manner. It is sectional drawing which shows the main part of the valve device further enlarged. It is sectional drawing which shows the state before brazing of the valve device. It is sectional drawing which shows the main part of the valve device which concerns on 2nd Embodiment which is an example of this invention. It is a top view which shows the flange part of the valve device. It is sectional drawing which shows the state before brazing of the valve device. It is sectional drawing which shows the main part of the valve device which concerns on the modification of this invention.

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

[First Embodiment]
As shown in FIGS. 1 and 2, the solenoid valve 1A of the present embodiment is a valve device that opens and closes a flow path between the first joint 101 and the second joint 102, and is a valve body 2 and a valve body 3. The valve seat member 4 and the driving means 5 are provided.

In the solenoid valve 1A, the valve body 3 is provided so as to move straight in a predetermined direction. In the following, the direction of the straight movement of the valve body 3 is the Z direction, the side where the valve body 3 moves so as to close the valve is the seating side (lower side in FIG. 1), and the valve body 3 moves so as to open the valve. The side to be seated is the seating side (upper side in FIG. 1). Further, the two directions orthogonal to the Z direction are defined as the X direction and the Y direction. When explaining the Z direction, it may be referred to as a detached side or a seated side, and may be simply referred to as an up / down side, but unless otherwise specified, the upper and lower sides are referred to with reference to FIG.

The valve body 2 is made of a metal such as brass 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 the present embodiment, the first port 21 is the inlet port (primary side) and the second port 22 is the exit port (secondary side). The valve body 2 is formed with a valve chamber 23 that communicates with the first port 21 and the second port 22 and accommodates the valve body 3. The valve chamber 23 also accommodates the lower end of the plunger 512, which will be described later. The valve body 2 is not limited to that made of brass, and may be made of, for example, stainless steel.

The valve body 2 is formed in a cylindrical shape as a whole extending along the Z direction, and has a convex portion 24 protruding inward from the second port 22 and the valve chamber 23. As a result, the inserted portion 25 having a diameter smaller than that of 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 seating side. The surface of the convex portion 24 facing the detached side becomes the detached side surface 241, and the detached side surface 241 is formed around the inserted portion 25. Further, a spiral groove 242 whose axial direction is the Z direction is formed on the inner peripheral surface of the convex portion 24 (that is, the inner peripheral surface of the inserted portion 25). The groove 242 is formed so as to communicate the space on the seated side of the inserted portion 25 (valve chamber 23) and the space on the seated side of the inserted portion 25 (second port 22). Further, the end portion of the spiral groove 242 on the detached seat side is opened in the 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 formed in a spherical shape by, for example, a metal such as stainless steel, is held by a valve body holder 514 described later, and moves straight in the Z direction to open and close the valve port 43 described later.

The valve seat member 4 is formed of a metal such as stainless steel as a separate body (separate part) from the valve body 2, has an insertion portion 41 and a flange portion 42, and has a valve port 43 communicating with the second port 22. The valve seat 44 and the valve seat 44 are formed. The material of the valve seat member 4 may be appropriately selected according to 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, a resin is used. However, as described above, it is preferable that the valve body 2 is made of brass having excellent workability and the valve seat member 4 is made of stainless steel having excellent durability. The insertion portion 41 is formed in a circular shape when viewed from the Z direction, is press-fitted (inserted) into the inserted portion 25 from the seated side, and its lower end is arranged so as to be close to the upper end of the second joint 102. To.

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 the flange portion 42 cannot be inserted into the inserted portion 25. In the 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 release side surface 241 of the valve body 2 from the release side, and the lower surface thereof ( The seating side surface) becomes the facing surface 421 facing the detached side surface 241 in the Z direction.

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

The drive means 5 is composed of a plunger unit 51 and an electromagnetic coil assembly 52. The plunger unit 51 includes a plunger tube 511, a plunger 512, a suction element 513, a valve body holder 514, and a 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 detached side) of the valve body 2. The plunger 512 is a movable iron core that can slide in the plunger tube 511 in the Z direction. The plunger 512 has a plunger chamber 512A which is an opening on the seating side, a pressure equalizing hole 512B which is a through hole in the Z direction inside, and a lower end hollow portion 512C which is an opening provided on the seating side. It is formed. By forming the pressure equalizing hole 512B in the Z direction and the lower end hollow portion 512C in the plunger 512, the plunger chamber 512A and the valve chamber 23 are communicated with each other through the through hole 514A described later and the pressure is equalized.

The suction element 513 is a fixed iron core fixed to the end of the plunger tube 511 on the detached 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 contracted so as to generate an urging force in the direction of closing the valve body 3.

The valve body holder 514 is made of a metal such as stainless steel, and is a substantially cylindrical member fixed to the seating side end of the plunger 512. The valve body holder 514 is provided in the valve chamber 23, and the valve body 3 is provided inside the valve chamber 23. keeping. A through hole 514A in the XY plane direction is formed in the vicinity of the middle stage in the Z direction of the valve body holder 514. 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 comes into contact with the valve seat 44, a high-pressure fluid acts on the valve body 3 from the seating side. In No. 3, it is easy 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 urges the valve body 3 to the seating side.

The electromagnetic coil assembly 52 is wound around a resin bobbin 521 concentrically attached to the plunger tube 511, a coil 522 that is wound around the bobbin 521 and excites the plunger 512 and an aspirator 513, and a coil 522. It has a casing 523 that accommodates the latter bobbin 521 inside 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 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. 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 closed.

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 urging force of the coil spring 515, and 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 and the spherical valve body 3 move to the seating side. The valve body 3 moves away from the valve seat 44 by moving to the remote seat side, the valve seat 44 is opened, and the solenoid valve 1A is opened. As a result, 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 energization from the lead wire 525 to the coil 522 is stopped and the normal state is restored again, the suction element 513 and the plunger 512 can be demagnetized (or demagnetized), and the attraction force between the suction element 513 and the plunger 512 can be demagnetized. 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, the valve body 3 is seated on the valve seat 44, and the solenoid valve 1A is closed again.

Here, the details of the fixing structure of the valve body 2 and the valve seat member 4 formed as separate bodies (separate parts) from each other will be described with reference to FIG. As described above, the detached side surface 241 of the valve 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 on the seating side surface 241 of these two facing surfaces so as to surround the valve port 43. That is, the insertion portion 41 of the valve seat member 4 on which the valve port 43 is formed is arranged inside the convex portion 24 on which the detached side surface 241 is formed, and the concave portion 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 abuts on the bottom surface of the recess 243. The restricting portion 422 regulates over-insertion of the valve seat member 4 into the inserted portion 25. The outer peripheral surface of the flange portion 42 has an arrangement portion 423 and a protrusion 424. The arranging portion 423 is a cylindrical surface extending from the restricting portion 422 toward the seating side, and its Z-direction dimension is larger than the depth of the recess 243, and the arranging portion 423 is arranged in the recess 243. Further, the protruding portion 424 protrudes from the arranging portion 423 to the outer peripheral side from the arranging portion 423 on the remote side from the arranging portion 423, and is arranged outside the concave portion 243.

The flange portion 42 having a circular shape in the Z direction has the largest diameter in the protruding portion 424, and the outer diameter of the protruding portion 424 is larger than the outer diameter of the recess 243 formed in the seating side surface 241. That is, the recess 243 has an exposed portion A1 exposed from the flange portion 42 when viewed from the seating side in the Z direction. The flange portion 42 and the recess 243 are formed concentrically, 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 position where the groove is deepest 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. The groove 242 has a substantially constant maximum inner diameter, that is, a substantially constant groove depth in the entire spiral. In the cross sections of FIGS. ing. In the cross section of FIGS. 2 and 3 rotated by a predetermined angle in the Z-axis direction, the groove 242 has the maximum inner diameter in the recess 243. The radius (outer diameter) of the regulating portion 422 is smaller than the maximum inner diameter of the groove 242 in the recess 243, and is arranged concentrically in the regulating portion 422 and the groove 242. In other words, the protrusion dimension of the restricting portion 422 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, in the recess 243, the opening of the groove 242 is not completely covered by the restricting portion 422, and a part of the groove 242 is exposed. As a result, the groove 242 and the recess 243 communicate with each other while the restricting portion 422 restricts the insertion into the inserted portion 25.

Next, a method of fixing the valve body 2 and the valve seat member 4 will be described. The valve body 2 and the valve seat member 4 are fixed by performing brazing in a direction in which the seating side is the upper side in the vertical direction. First, as shown in FIG. 4, the brazing filler metal 10 is arranged in the recess 243. At this time, the brazing filler metal 10 is aligned with the outer periphery of the arranging portion 423 in the flange portion 42, and a part of the brazing filler metal 10 is sandwiched from the Z direction by the protruding portion 424 and the bottom surface of the recess 243 (the brazing filler metal in the Z direction). A part and the protrusion 424 overlap). In this way, the brazing filler metal 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 of the brazing filler metal moves downward in the vertical direction due to gravity, so that the valve body 2 and the valve seat member 4 It penetrates into the gap between. At this time, the molten brazing material easily passes through the spiral groove 242. Further, the brazing material staying in the recess 243 forms an annular shape along the recess 243.

As the brazing material accumulated in the recess 243 solidifies in this way, the valve chamber 23 and the second joint 102 do not communicate 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 above embodiment, since the annular recess 243 is formed on the seating side surface 241, it is possible to easily fasten the molten brazing material in the recess 243. As a result, while fixing the valve body 2 and the valve seat member 4, it is easy to braze over the entire circumference so as to surround the valve port 43, and fluid leakage at the connection 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 portion 42, and the brazing material is infiltrated into the entire circumference between the entire outer circumference of the flange portion and the inner peripheral surface of the valve body 2. In comparison, the amount of brazing material required can be reduced. Therefore, it is possible to reduce the amount of the brazing material used while ensuring the sealing property.

Since the recess 243 has the exposed portion A1, the state of brazing in the recess 243 can be visually recognized from the seated side, and the deterioration of the sealing property due to the local absence of the brazing material can be suppressed. Further, since the recess 243 is formed in an annular shape, it is possible to make it easier to confirm whether brazing is appropriately performed over the entire circumferential direction of the recess.

Further, since the outer peripheral surface of the flange portion 42 has the arrangement portion 423 and the protrusion 424, the brazing material 10 before melting is arranged along the outer periphery of the arrangement portion 423, and the bottom surface of the recess 243 and the protrusion 243. It can be sandwiched by the portion 424 and the workability at the time of brazing can be improved.

Further, when the restricting portion 422 of the flange portion 42 restricts the insertion into the inserted portion 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. It is possible to make it easier for the brazing material to penetrate.

[Second Embodiment]
As shown in FIG. 5, the solenoid valve of the present embodiment uses the solenoid valve 4B instead of the valve seat member 4, and the brazing method is the same as that of the solenoid valve 1A of the first embodiment. It's different.

The valve seat member 4B has an insertion portion 41 and a flange portion 45, and is 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 in 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, and the large diameter portion may be different. The range may be different between the parts or between the small diameter parts. 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 recess 243.

Due to the formation of such a small diameter portion 452, the recess 243 has an exposed portion A2 exposed from the flange portion 45 when viewed from the seating 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 described. The valve body 2 and the valve seat member 4 are fixed by performing brazing with the seating side facing upward in the vertical direction. First, as shown in FIG. 7, the brazing filler metal 10 is arranged at the insertion portion 41 of the valve seat member 4. At this time, as shown in the figure, a step portion having a small diameter on the tip side (seating side) is formed in the insertion portion 41, and the brazing material 10 is held by this step portion (the brazing material is placed on the outer periphery of the small diameter portion). It is preferable to follow).

By melting the brazing filler metal 10, it moves downward in the vertical direction due to 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 part 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 stays in the recess 243 to form an annular shape.

According to the above embodiment, similarly to the first embodiment, the annular recess 243 is formed on the seating side surface 241 to reduce the amount of brazing material used while ensuring the sealing property. Can be done. Further, since the recess 243 has the exposed portion A2, the brazed state in the recess 243 can be visually recognized from the seated 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 secured. As a result, the outer peripheral surface of the large diameter portion 451 can be arranged so as to be close to the inner peripheral surface of the valve body 2, and rattling of the valve seat member 4 with respect to the valve body 2 can be suppressed.

The present invention is not limited to the above embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the present invention also includes modifications and the like as shown below. For example, in the first embodiment and the second embodiment, it is assumed that the recess 243 is formed on the detached side surface 241 of the facing detached side surface 241 and the facing surface 421, but the recess is formed on the facing 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 having a recess 462 formed on the facing surface 461 may be used. In the embodiment shown in FIG. 8, brazing may be performed with the seating side facing upward in the vertical direction, as in the second embodiment.

According to such a configuration, as in the first embodiment and the second embodiment, the recess 462 is formed, so that the amount of brazing material used can be reduced while ensuring the sealing property. .. Further, when the valve seat member 4C is formed of a material softer than the valve body 2, it is easy to form a recess. Further, since it is not necessary to form a recess in the valve body 2, there is no need to change the design of the valve body 2.

It should be noted that the recess may be formed on the side surface of the detached seat as in the first embodiment and the second embodiment, and the recess may be formed on the facing surface as in the modified example of FIG.

Further, in the first embodiment, the outer peripheral surface of the flange portion 42 has the arrangement portion 423 and the protrusion portion 424, but the brazing material depends on the size and shape of the brazing material before melting, the relationship with the concave portion, and the like. The flange portion may not have an arranging portion and a protruding portion as long as it can be stably held.

Further, in the first embodiment and the second embodiment, the recesses 243 formed on the seating side surface 241 have the exposed portions A1 and A2, but the recesses are formed on the seating side surface and the recesses are formed. May have no exposed portion. With such a configuration, it is not necessary to process the flange portion in order to form the exposed portion, the shape of the valve seat member can be simplified, and the design change of the valve seat member can be omitted.

Further, in the first embodiment, the solenoid valve 1A is provided with the drive means 5 composed of the plunger unit 51 and the electromagnetic coil assembly 52, but the valve device may be provided with other drive means.

Further, in the first embodiment, a spiral groove 242 is formed on 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 while forming the groove 242. It is assumed that the recess 243 communicates with the recess 243, but the configuration is not limited to this. That is, the groove formed in the inserted portion is not limited to the spiral shape, and for example, a linear groove extending along the linear movement direction of the valve body and an annular shape formed around the linear movement direction of the valve body are annular. A groove may be combined. Further, the groove may be completely covered by the regulating portion, and in such a configuration, a communication hole for communicating the recess and the groove may be provided by additional machining. In addition, if the molten brazing material easily penetrates between the valve body and the valve seat member due to the relationship between the dimensions and the material, a spiral groove or the like is not formed on the inner peripheral surface of the inserted portion. You may.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention.

1A ... Solenoid valve (valve device), 2 ... Valve body, 21 ... 1st port, 22 ... 2nd port, 23 ... Valve chamber, 241 ... Separated side surface, 243 ... Recess, 25 ... Inserted part, 3 ... Valve Body, 4 ... Valve seat member, 41 ... Insertion part, 42, 45, 46 ... Flange part, 421, 461 ... Facing surface, 423 ... Arrangement part, 424 ... Protruding part, 451 ... Large diameter part, 452 ... Small diameter part, 462 ... concave, 5 ... drive means, A1, A2 ... exposed part

Claims (7)

A valve device that opens and closes the flow path between the first port to which the first joint is connected and the second port to which the second joint is connected by seating or leaving the valve body on the valve seat.
The valve body that moves straight to the seating side or the leaving side,
A valve body having the first port and the second port and having a valve chamber for accommodating the valve body, and a valve body.
A valve port formed separately from the valve body and communicating with the second port, and a valve seat member on which the valve seat is formed.
The driving means for driving the valve body is provided.
The valve body has a portion to be inserted in which a part of the valve seat member is inserted from the seated side, and a seated side surface formed around the inserted portion and facing the seated side. Have and
The valve seat member has an insertion portion to be inserted into the seated portion, and a flange portion having a facing surface facing the seating side surface and being arranged so as to cover the seating side surface.
A valve device characterized in that an annular recess is formed on at least one of the seated side surface and the facing surface so as to surround the valve port. The recess having an exposed portion exposed from the flange portion when viewed from the seating side is formed on the seating side surface.
The valve device according to claim 1, wherein the exposed portion is formed in an annular shape or is formed at a plurality of locations in the circumferential direction. The valve device according to claim 2, wherein the exposed portion is formed in an annular shape by forming the outer diameter of the concave portion on the side surface of the detached seat to be larger than the outer diameter of the flange portion. .. The outer peripheral surface of the flange portion has an arrangement portion arranged in a recess on the side surface of the seating portion, and a protruding portion protruding toward the outer peripheral side of the arrangement portion on the separation side from the arrangement portion. The valve device according to claim 3. A groove is formed on the inner peripheral surface of the inserted portion to allow the space on the detached side and the space on the seated side to communicate with each other.
The groove opens in the recess at the end on the detached side, and the groove is opened.
The flange portion has a regulating portion that is arranged in the recess and regulates insertion into the inserted portion.
When the restricting portion is inserted into the inserted portion, the protrusion dimension from the inner peripheral surface of the inserted portion is smaller than the depth of the groove in the recess, so that the restricting portion can be inserted into the inserted portion. The valve device according to any one of claims 2 to 4, wherein the groove and the recess are communicated with each other while being regulated. 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 concave portion on the side surface of the detached seat, and the outer diameter of the large diameter portion is formed to be larger than the outer diameter of the concave portion on the side surface of the detached seat. The valve device according to claim 2, wherein the exposed portions are formed at a plurality of locations in the circumferential direction. The driving means has a plunger, an attractor, and an exciting coil.
The valve device according to any one of claims 1 to 6, wherein the valve device functions as a solenoid valve.

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