JP6941087B2 - Valve device and solenoid valve - Google Patents

Description

The present invention relates to a valve device and a solenoid valve.

Conventionally, as a valve device, a valve chamber, a valve body that can move in the valve chamber, an inflow port that communicates with the valve chamber to introduce a fluid, and an outflow port that communicates with the valve chamber and leads out a fluid. Solenoid valves and electric valves equipped with the above are used. As one of such valve devices, a solenoid valve used in an analyzer or the like to deliver a predetermined amount of fluid (liquid, reagent) has been proposed (see, for example, Patent Document 1). The solenoid valve described in Patent Document 1 includes a diaphragm (valve body) that divides the valve chamber into upper and lower parts, an inflow port that opens substantially in the center of the bottom surface of the valve chamber, and an outflow port that opens at a position off the center of the bottom surface. And have.

In this solenoid valve, an elastic valve seat is attached to the inflow port, and a ring-shaped protrusion of the valve seat is provided so as to project toward the valve chamber side. When the solenoid valve closes, the lowered valve body first comes into contact with the ring-shaped protrusion to close the inflow port to stop the inflow of fluid into the valve chamber, and then the valve body further lowers. While pressing and contracting the ring-shaped protrusion, the diaphragm is brought into close contact with the bottom surface of the valve chamber, whereby the fluid in the valve chamber is allowed to flow out from the outflow port.

Japanese Unexamined Patent Publication No. 8-277960

However, in the conventional valve device as described in Patent Document 1, the diaphragm is brought into close contact with the bottom surface of the valve chamber while pressing and contracting the ring-shaped protrusion of the valve seat. The outer peripheral side starts to abut on the bottom surface, and the inner peripheral side around the ring-shaped protrusion finally abuts on the bottom surface. Therefore, the outflow port is closed before the inner peripheral side of the diaphragm comes into contact with the bottom surface of the valve chamber, and there is a possibility that fluid may remain in the valve chamber. In addition, if the ring-shaped protrusion cannot be sufficiently contracted due to deterioration of the valve seat or insufficient driving force, a gap may be created between the diaphragm around the ring-shaped protrusion and the bottom surface of the valve chamber. In this case as well, there is an inconvenience that the fluid remains in the valve chamber. If the fluid remains in the valve chamber in this way, the amount and concentration of the fluid will change at the time of feeding at the next valve opening, which may lead to a decrease in analysis accuracy due to a measurement error. Also, when cleaning the valve chamber, the cleaning level may decrease due to the influence of the remaining fluid.

An object of the present invention is to provide a valve device and a solenoid valve that can prevent fluid from remaining in the valve chamber when the valve is closed.

In the valve device of the present invention, the valve chamber, the valve body that can move in the valve chamber, the inflow port that communicates with the valve chamber to introduce the fluid, and the fluid is led out by communicating with the valve chamber. A valve device including an outflow port, wherein the valve chamber has a mortar-shaped valve seat surface whose inner diameter decreases downward, and opens at the bottom of the valve seat surface to open the outflow port. Is provided, the inflow port is provided by opening in the middle portion of the valve seat surface above the outflow port, and the valve body has a close surface provided so as to face the valve seat surface. a valve opening position for opening the inlet port spaced apart from the valve seat surface, is provided movably and valve closed position closing the inlet port by tightly the contact surface on the valve seat surface, between the The valve body has a diaphragm that seals the valve chamber, and the peripheral portion of the diaphragm is held in close contact with the upper end edge of the valve seat surface, and the surface of the diaphragm on the valve chamber side causes the valve body. It is characterized in that the close contact surface is formed.

According to the present invention, an outflow port is provided at the bottom of the mortar-shaped valve seat surface, and an inflow port is provided at the middle portion of the valve seat surface above the outflow port, so that the fluid can flow. By facilitating the flow to the lower outflow port along the valve seat surface and closing the inflow port by bringing the close surface of the valve body into close contact with the valve seat surface at the valve closing position, the inflow of fluid into the valve chamber is stopped. It is possible to prevent fluid from remaining in the valve chamber.
Further, according to this configuration, the valve body has a diaphragm, and the peripheral portion of the diaphragm is held in close contact with the upper end edge of the valve seat surface, so that the upper end edge of the valve seat surface accompanies the valve closing movement. The close surfaces of the diaphragm surface can be brought into contact with each other in order from the beginning. Further, by sealing the valve chamber with a diaphragm, it is possible to prevent fluid from leaking to the outside of the valve chamber.

At this time, as the valve closing moves from the valve opening position to the valve closing position, the valve body gradually moves from the upper end side of the valve seat surface located above the inflow port toward the outflow port. It is preferable that the close contact surface is brought into close contact with the valve seat surface while expanding the close contact area.

According to this configuration, as the valve body moves to close the valve, the close contact area gradually expands from the upper end side of the valve seat surface toward the outflow port, and the close contact surface comes into close contact with the valve seat surface toward the outflow port. The fluid can be pushed out, and the fluid can be more reliably discharged from the valve chamber.

Further, the valve body has an elastic body that can be elastically deformed to form the close contact surface, and at the valve opening position, the separation distance between the close contact surface and the valve seat surface is set to the upper end side of the valve seat surface. It is preferable that the lower end side is wider than the valve seat surface, and the elastic body is elastically deformed as the valve closes, so that the close contact area is gradually expanded and the close contact surface is brought into close contact with the valve seat surface.

According to this configuration, the separation distance between the close contact surface of the valve body and the valve seat surface is widened on the lower end side of the valve seat surface, and the elastic body of the valve body is elastically deformed and gradually deformed as the valve closes. By making the close contact surface close to the valve seat surface while expanding the close contact area, the close contact surface can be brought into contact with the valve seat surface in order from the upper end side as the valve body closes and moves, and the fluid can flow to the outflow port. You can push it more reliably toward you.

Further, it is preferable that the valve body has a pressing portion that presses the elastic body toward the inflow port from the opposite side of the close contact surface.

According to this configuration, the valve body has a pressing portion, and by pressing the elastic body toward the inflow port by this pressing portion, the inflow port can be reliably closed at the valve closing position, and the inside of the inflow port can be reliably closed. Even if a situation occurs in which the pressure rises abnormally, valve leakage caused by the elastic body being pushed up by the high-pressure fluid can be suppressed.

Further, it is preferable that the valve body has an urging portion for urging the elastic body toward the valve seat surface from the opposite side of the close contact surface.

According to this configuration, the valve body has an urging portion, and the elastic body is urged toward the valve seat surface by the urging portion, so that the close contact surface of the elastic body is appropriately adjusted when the valve is closed. It can be brought into contact with the valve seat surface while being bent into a shape, and the elastic body can be appropriately brought into close contact with the valve seat surface at the valve closed position.

The solenoid valve of the present invention is a solenoid valve including an electromagnetic drive unit that drives a valve body by moving a plunger arranged in a plunger case facing an attractor in the axial direction of the plunger case. It is characterized by including the valve chamber, the valve body, the inflow port and the outflow port in any of the valve devices.

According to the present invention as described above, it is possible to realize a solenoid valve in which fluid is unlikely to remain in the valve chamber when the valve is closed, similar to the effect of the valve device described above.

According to the valve device and the solenoid valve of the present invention, it is possible to prevent fluid from remaining in the valve chamber when the valve is closed.

It is a vertical cross-sectional view which shows the valve open state at the time of energization of the solenoid valve which concerns on embodiment of this invention. It is a vertical cross-sectional view which shows the valve closed state in the non-energized state of the solenoid valve. (A) to (C) are enlarged cross-sectional views showing a first modification of the solenoid valve. (A) to (C) are enlarged cross-sectional views showing a second modification of the solenoid valve. It is an enlarged cross-sectional view which shows the 3rd modification of the solenoid valve. (A) to (C) are enlarged cross-sectional views showing a fourth modification of the solenoid valve. It is a vertical cross-sectional view which shows the main part of the valve device which concerns on the modification of this invention in an enlarged manner.

A solenoid valve as a valve device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. As shown in FIGS. 1 and 2, the solenoid valve of the present embodiment includes a valve housing 1, an electromagnetic drive unit 2, and a valve body 3. The concept of "upper and lower" in the following description corresponds to upper and lower in the drawings of FIGS. 1 and 2. This solenoid valve is used to deliver a predetermined amount of fluid supplied from the supply source to the supply destination. The fluid can be arbitrarily selected from various liquids such as chemicals and various gases, and may be in both gas and liquid states such as a gas-liquid two-phase refrigerant.

The valve housing 1 is an integrally molded member made of resin, and has a substantially cylindrical main body portion 1A, a tubular primary pipe portion 1B protruding laterally from the main body portion 1A and connected to the supply source, and a main body portion 1A. It is provided with a tubular secondary pipe portion 1C that protrudes downward from the surface and is connected to a supply destination. The valve housing 1 is not limited to the integrally molded member made of resin, and may be made of metal or may be formed by combining a plurality of parts. A thin annular step portion 10 is formed on the upper end surface of the main body portion 1A on the electromagnetic drive portion 2 side, and a conical valve chamber 11 having an axis X as a center line is formed from the step portion 10 toward the lower part. ing. The axis X is also the center line of the plunger case 21, which will be described later.

The valve chamber 11 has a mortar-shaped valve seat surface 12 whose inner diameter decreases toward the bottom. Further, the valve housing 1 extends to the left and right over the main body 1A and the primary pipe 1B, and extends over the inflow port 13 communicating with the valve chamber 11 to introduce the fluid, and the main body 1A and the secondary pipe 1C. It is provided with an outflow port 14 that extends up and down and communicates with the valve chamber 11 to lead a fluid. The outflow port 14 is provided by opening at the bottom of the valve seat surface 12, and the inflow port 13 bends upward inside the main body 1A and opens at the intermediate portion of the valve seat surface 12 above the outflow port 14. Is provided.

The electromagnetic drive unit 2 is arranged in a plunger case 21 made of a non-magnetic material, an attractor 22 made of a magnetic material fixed to the upper end of the plunger case 21, and facing the lower side of the attractor 22 in the plunger case 21. The plunger 23 is provided, and the plunger spring 24 disposed between the suction element 22 and the plunger 23 is provided. Further, the electromagnetic drive unit 2 includes a bobbin 25 arranged on the outer periphery of the plunger case 21, an electromagnetic coil 26 in which a winding is wound around the bobbin 25, and an outer box 27 containing the bobbin 25 and the electromagnetic coil 26. It includes a joint iron 28 for securing a magnetic path from the lower part of the outer box 27 to the plunger 23 and the suction element 22, and a fixing ring 29 fixed to the plunger case 21 at the lower surface position of the outer box 27.

The plunger case 21 defines a plunger chamber 21a inside which is formed in a cylindrical shape, and is fixed to the suction element 22 by welding or the like so as to cover the suction element 22 by a part of the side surface thereof. The suction element 22 has a mortar-shaped suction surface 22a that opens toward the plunger 23, and a spring contact member 22b that is sandwiched between the suction element 22 and the plunger spring 24. The plunger 23 is made of an appropriate magnetic material so as to be attracted by the attractor 22, and is housed in the plunger chamber 21a. At the same time, the taper portion 23a and the spring accommodating hole for accommodating the plunger spring 24 are accommodated on the suction element 22 side. It has 23b and. The plunger 23 has two upper and lower sliding contact rings 23c that are in sliding contact with the inner peripheral surface of the plunger case 21 and is provided so as to be movable in the axis X direction. Further, the plunger 23 has an extension shaft portion 23d extending downward, and a diaphragm 31 is held at the tip end portion of the extension shaft portion 23d, and a valve body base portion 32 forming a part of the valve body 3 is formed. Is provided.

The valve body 3 is composed of a diaphragm 31 and a valve body base 32 of the plunger 23. The diaphragm 31 is made of rubber and has a substantially disk-like shape as a whole, and has an inner bead portion 31a at the center of the upper surface and an outer bead portion 31b at the outer peripheral portion. Then, the inner bead portion 31a is held between the extension shaft portion 23d and the valve body base portion 32, and the outer bead portion 31b is sandwiched between the fixing ring 29 and the step portion 10 of the valve housing 1. As a result, the diaphragm 31 is attached between the valve housing 1 and the electromagnetic drive unit 2. As a result, the diaphragm 31 airtightly seals the valve chamber 11 of the valve housing 1 and the plunger chamber 21a of the electromagnetic drive unit 2. The diaphragm 31 has an elastic body 33 formed in a truncated cone shape with the axis X as the center line and elastically deformable, and on the lower surface side of the elastic body 33, a conical surface whose inner diameter decreases toward the bottom. A close surface 34, which is a part of the valve seat surface 12 and has substantially the same shape as the valve seat surface 12, is provided.

In the above solenoid valve, when energized as shown in FIG. 1, that is, when the electromagnetic coil 26 is energized, an attractive force is generated between the suction element 22 and the plunger 23, and the plunger 23 and the valve body 3 rise. The diaphragm 31 of the valve body 3 is in a valve open state when the close contact surface 34 is separated from the valve seat surface 12 to open the inflow port 13 and the outflow port 14. As described above, the solenoid valve of the present embodiment is a "energized open specification" solenoid valve that is in a valve open state (valve open position) when energized. In such a valve open state, the fluid flowing into the valve chamber 11 from the inflow port 13 smoothly flows out from the outflow port 14.

On the other hand, when the electromagnetic coil 26 is not energized, that is, when the electromagnetic coil 26 is not energized as shown in FIG. 2, the plunger 23 and the valve body 3 are urged downward by the urging force of the plunger spring 24, and the diaphragm 31 of the valve body 3 is urged downward. In the case where the close contact surface 34 is in close contact with the valve seat surface 12 and the inflow port 13 is closed, the valve is in the valve closed state (valve closed position). In such a valve closed state, the fluid in the inflow port 13 is blocked by the diaphragm 31 of the valve body 3 and does not flow into the valve chamber 11, and the fluid in the valve chamber 11 smoothly flows out from the outflow port 14 and is in the valve chamber. No fluid remains in 11.

In the solenoid valve of the present embodiment, the valve seat surface 12 of the valve chamber 11 and the close surface 34 of the valve body 3 each have substantially the same shape including a part of the conical surface, and are substantially parallel to each other in the valve open state. The shape is not limited to the shape provided so that substantially the entire surface is brought into close contact with each other as the valve closes. That is, the valve seat surface 12 and the close contact surface 34 gradually come into close contact with each other from the upper end side of the valve seat surface 12 located above the inflow port 13 toward the outflow port 14 as the valve body 3 moves to close the valve. The shape may be such that the surface 34 is in close contact with the valve seat surface 12 while expanding the shape. Further, at the valve opening position, the separation distance between the close contact surface 34 and the valve seat surface 12 is wider on the lower end side than the upper end side of the valve seat surface 12, and the elastic body 33 of the diaphragm 31 accompanies the valve closing movement of the valve body 3. It is preferable that the shape is such that the close contact surface 34 is in close contact with the valve seat surface 12 while gradually expanding the close contact area by elastically deforming. Specifically, the shapes of the valve seat surface 12 and the close contact surface 34 as shown in FIGS. 3 and 4 can be adopted.

FIG. 3 is an enlarged cross-sectional view showing a first modification of the solenoid valve of the present embodiment. As shown in FIG. 3A, the valve seat surface 12 and the close contact surface 34 of the solenoid valve of the first modification are each composed of a part of a conical surface, but the valve seat surface 12 and the axis X are aligned with each other. The angle θ2 formed by the close surface 34 of the valve body 3 and the axis X at the valve opening position is set to be larger than the angle θ1 formed, and the separation from the close surface 34 on the lower end side of the valve seat surface 12 rather than the upper end side. The distance is getting wider. As shown in FIG. 3B, the valve seat surface 12 and the close contact surface 34 start to come into close contact with each other from the upper end side of the valve seat surface 12 when the valve body 3 moves to close the valve, and the elastic body 33 The close contact surface 34 is deformed following the valve seat surface 12 due to the elastic deformation of the fluid R, and pushes the fluid R toward the outflow port 14 while gradually expanding the close contact area downward. Further, as shown in FIG. 3C, when the valve body 3 descends to the valve closing position, the inflow port 13 is closed by the close contact surface 34, whereby all the fluid R in the valve chamber 11 flows out from the outflow port 14. It is designed to do.

FIG. 4 is an enlarged cross-sectional view showing a second modification of the solenoid valve of the present embodiment. As shown in FIGS. 4 (A) to 4 (C), the valve seat surface 12 and the close contact surface 34 of the solenoid valve of this second modification have a smooth curve (for example, an upward convex surface 12) in a vertical cross-sectional view. , Arc shape), the close contact surface 34 is composed of a part of the conical surface, and the separation distance from the close contact surface 34 is wider on the lower end side than the upper end side of the valve seat surface 12. Not limited to the valve seat surface 12, the close contact surface 34 may be formed of a smooth curve that is convex downward in a vertical cross-sectional view. As shown in FIG. 4B, the valve seat surface 12 and the close contact surface 34 start to come into close contact with each other from the upper end side of the valve seat surface 12 when the valve body 3 moves to close the valve, and the elastic body 33 The close contact surface 34 is deformed following the valve seat surface 12 due to the elastic deformation of the fluid R, and pushes the fluid R toward the outflow port 14 while gradually expanding the close contact area downward. Further, as shown in FIG. 4C, when the valve body 3 descends to the valve closing position, the inflow port 13 is closed by the close contact surface 34, whereby all the fluid R in the valve chamber 11 flows out from the outflow port 14. It is designed to do.

Further, in the solenoid valve of the present embodiment, the valve body 3 is composed of the diaphragm 31 and the valve body base portion 32 of the plunger 23, and the pressing portion and the biasing portion as shown in FIGS. The unit may be further provided. FIG. 5 is an enlarged cross-sectional view showing a third modification of the solenoid valve of the present embodiment. As shown in FIG. 5, the valve body 3 in the solenoid valve of the third modification projects radially outward from the valve body base 32 of the plunger 23, and presses against the inflow port 13 with the elastic body 33 of the diaphragm 31 interposed therebetween. The part 35 is provided. The pressing portion 35 has an inclination substantially parallel to the valve seat surface 12 and is provided so as to cover the upper part of the inflow port 13, and when the valve body 3 moves to the valve closing position, the opposite side of the close contact surface 34. By pressing the elastic body 33 toward the inflow port 13, even if a situation occurs in which the pressure in the inflow port 13 rises abnormally, the elastic body 33 is pushed up by the high-pressure fluid to generate a valve. Leakage can be suppressed.

FIG. 6 is an enlarged cross-sectional view showing a fourth modification of the solenoid valve of the present embodiment. As shown in FIG. 6, the valve body 3 in the solenoid valve of the fourth modification projects radially outward from the valve body base 32 of the plunger 23 and faces the valve seat surface 12 with the elastic body 33 of the diaphragm 31 interposed therebetween. The urging unit 36 is provided. The urging portion 36 is made of a metal or resin leaf spring or the like separate from the plunger 23, and is formed in an overall disk shape (dish shape) covering the opposite side of the close contact surface 34 of the elastic body 33. ing. The urging portion 36 exerts an urging force (restoring force) by bending with the valve closing movement of the valve body 3, and attaches the elastic body 33 toward the valve seat surface from the opposite side of the close contact surface 34. The material and shape are not particularly limited as long as they are vigorous. Further, the urging portion 36 is not limited to a leaf spring or the like separate from the plunger 23, and is composed of a thin plate-shaped portion that protrudes radially outward from the valve body base 32 integrally with the plunger 23. May exert its urging force by bending.

As shown in FIG. 6B, in the valve body 3 provided with such an urging portion 36, when the valve body 3 moves to close the valve, the close contact surface 34 starts to come into close contact from the upper end side of the valve seat surface 12, and the valve body 3 is attached. The elastic body 33 is deformed into a downwardly convex curved surface while pressing the elastic body 33 toward the valve seat surface 12 at its outer peripheral edge, whereby the elastic body 33 is elastically deformed into a downwardly convex curved surface while being urged. Let me. Due to the deformation of the urging portion 36 and the elastic body 33 due to the valve closing movement of the valve body 3, the close contact surface 34 gradually expands the close contact area from the upper end side of the valve seat surface 12 toward the outflow port 14, and the valve is valved. It is in close contact with the seat surface 12 and pushes the fluid R toward the outflow port 14. Further, as shown in FIG. 6C, when the valve body 3 is lowered to the valve closing position, the urging portion 36 and the elastic body 33 have a shape along the valve seat surface 12, and the close contact surface 34 is the valve seat. The inflow port 13 is closed by being in close contact with the surface 12, whereby all the fluid R in the valve chamber 11 flows out from the outflow port 14.

According to the above embodiment, the outflow port 14 is provided at the bottom of the mortar-shaped valve seat surface 12, and the inflow port 13 is provided at the intermediate portion of the valve seat surface 12 above the outflow port 14. As a result, the fluid easily flows to the lower outflow port 14 along the valve seat surface 12, and at the valve closing position, the close surface 34 of the valve body 3 is brought into close contact with the valve seat surface 12 to close the inflow port 13 and the valve is closed. By stopping the inflow of the fluid into the chamber 11, it is possible to prevent the fluid from remaining in the valve chamber 11.

Further, the valve body 3 has a diaphragm 31, and the peripheral portion of the diaphragm 31 is held in close contact with the upper end edge of the valve seat surface 12, so that the valve seat surface 12 is held from the upper end edge of the valve seat surface 12 as the valve closes. The close contact surface 34 of the diaphragm 31 can be brought into contact with the valve seat surface 12 in this order. Further, by sealing the valve chamber 11 and the plunger chamber 21a with the diaphragm 31, it is possible to prevent the fluid from leaking to the outside of the valve chamber 11.

Further, as shown in FIGS. The body 33 elastically deforms and gradually expands the close region, and the close contact surface 34 comes into close contact with the valve seat surface 12, so that the fluid can be pushed out toward the outflow port 14 and the fluid flows out more reliably. It is possible to prevent the fluid from remaining in the valve chamber 11.

Further, as shown in FIG. 5, if the valve body 3 has the pressing portion 35, the elastic body 33 is pressed toward the inflow port 13 by the pressing portion 35, so that the inflow port 13 is in the valve closed position. Even if a situation occurs in which the pressure in the inflow port 13 rises abnormally, the valve leakage caused by the elastic body 33 being pushed up by the high-pressure fluid can be suppressed.

Further, as shown in FIG. 6, if the valve body 3 has the urging portion 36, the urging portion 36 urges the elastic body 33 toward the valve seat surface 12 to move the valve closed. At this time, the close contact surface 34 of the elastic body 33 can be brought into contact with the valve seat surface 12 while being bent into an appropriate shape, and the elastic body 33 can be appropriately brought into close contact with the valve seat surface 12 at the valve closing position.

The present invention is not limited to the above-described embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention. For example, in the above-described embodiment, the solenoid valve is exemplified as the valve device of the present invention, but the valve device may be an electric valve, a manual opening / closing valve, or the like. Further, in the solenoid valve of the above embodiment, the valve body 3 has a diaphragm 31 and the diaphragm 31 is provided with a close surface 34, but the valve body is not limited to the one having a diaphragm, and the following It may be a valve body as shown in FIG.

FIG. 7 is an enlarged vertical cross-sectional view showing a main part of the valve device according to the modified example of the present invention. This valve device includes a valve housing 1 having a valve chamber 11, an inflow port 13 and an outflow port 14, and a valve body 3 having an elastic body 33, similarly to the solenoid valve of the above embodiment. The valve chamber 11 has a mortar-shaped valve seat surface 12, and the elastic body 33 of the valve body 3 is made of rubber and has a close contact surface 34 having substantially the same shape as the valve seat surface 12 on the lower surface of the entire columnar shape. It is configured. The elastic body 33 is not limited to rubber, but may be made of resin. Further, the elastic body 33 of the valve body 3 is made of metal instead of the elastic body 33, and only the close contact surface 34 is made of a rubber or resin surface member. You may. The valve body 3 is driven forward and backward by a driving means (not shown), and as shown in FIG. 7A, the valve opening position where the close contact surface 34 is separated from the valve seat surface 12 to open the inflow port 13 and FIG. 7 (A). As shown in B), the valve seat surface 12 is provided so as to be movable between the valve closing position where the close contact surface 34 is brought into close contact with the valve seat surface 12 and the inflow port 13 is closed. As the driving means, as in the electromagnetic driving unit 2 of the above-described embodiment, the attractive force of the suction element 22 and the plunger 23 may be used, or a rotary driving unit such as a stepping motor and a screw feed mechanism may be provided. It may be the one that has been used.

Similar to the above embodiment, the valve device of such a modified example is also provided with an outflow port 14 at the bottom of the mortar-shaped valve seat surface 12, and is provided at an intermediate portion of the valve seat surface 12 above the outflow port 14. Since the inflow port 13 is provided, the fluid can easily flow to the lower outflow port 14 along the valve seat surface 12, and the close contact surface 34 of the valve body 3 is brought into close contact with the valve seat surface 12 at the valve closed position. By closing the inflow port 13 and stopping the inflow of the fluid into the valve chamber 11, it is possible to prevent the fluid from remaining in the valve chamber 11.

Further, in the first and second modifications of the embodiment, the valve body 3 has the elastic body 33 of the diaphragm 31, and the separation distance between the close contact surface 34 and the valve seat surface 12 at the valve opening position is the valve seat surface 12. The structure is such that the elastic body 33 elastically deforms as the valve closes and the valve seat surface 12 is in close contact with the valve seat surface 12, but the structure is not limited to this. .. That is, the valve body does not have an elastic body, and the valve seat surface is composed of an elastic body, and the valve seat surface is elastically deformed to gradually expand the close area and the valve seat surface and the close contact surface are in close contact with each other. It may be. Further, in the above-described embodiment, the valve body 3 is configured to move linearly forward and backward along the axis X, but the present invention is not limited to this, and the valve body may move in a curved or rotational motion. By such movement of the valve body, the valve seat surface and the close surface may be in close contact with each other while gradually expanding the close region from the upper end side of the valve seat surface downward.

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.

2 Electromagnetic drive 3 Valve body 11 Valve chamber 12 Valve seat surface 13 Inflow port 14 Outflow port 21 Plunger case 22 Attractor 23 Plunger 31 Diaphragm 33 Elastic body 34 Close contact surface 35 Pressing part 36 Biasing part

Claims (6)

It is provided with a valve chamber, a valve body that can move in the valve chamber, an inflow port that communicates with the valve chamber to introduce a fluid, and an outflow port that communicates with the valve chamber and leads out a fluid. It is a valve device
The valve chamber has a mortar-shaped valve seat surface whose inner diameter decreases toward the bottom, and the outflow port is provided by opening at the bottom of the valve seat surface, and the valve above the outflow port. The inflow port is provided by opening in the middle part of the seat surface.
The valve body has a close contact surface provided so as to face the valve seat surface, and the valve opening position at which the inflow port is opened apart from the valve seat surface and the close contact surface are brought into close contact with the valve seat surface. It is movably provided between the valve closing position that closes the inflow port and the valve closing position .
The valve body has a diaphragm that seals the valve chamber, and the peripheral portion of the diaphragm is held in close contact with the upper end edge of the valve seat surface, and the surface of the diaphragm on the valve chamber side causes the valve body to hold the diaphragm. A valve device characterized by having a close contact surface. With the valve closing movement from the valve opening position to the valve closing position, the valve body gradually forms a close region from the upper end side of the valve seat surface located above the inflow port toward the outflow port. The valve device according to claim 1, wherein the close contact surface is brought into close contact with the valve seat surface while being expanded. The valve body has an elastic body that can be elastically deformed to form the close surface, and at the valve opening position, the separation distance between the close surface and the valve seat surface is larger than that on the upper end side of the valve seat surface. The valve device according to claim 2, wherein the lower end side is wide, and the elastic body is elastically deformed as the valve closes, so that the close contact area is gradually expanded and the close contact surface is brought into close contact with the valve seat surface. .. The valve device according to claim 3, wherein the valve body has a pressing portion that presses the elastic body toward the inflow port from the opposite side of the close contact surface. The valve device according to claim 3 or 4, wherein the valve body has an urging portion that urges the elastic body toward the valve seat surface from the opposite side of the close contact surface. A solenoid valve provided with an electromagnetic drive unit that drives a valve body by moving a plunger arranged in the plunger case facing the attractor in the axial direction of the plunger case.
A solenoid valve comprising the valve chamber, the valve body, the inflow port, and the outflow port in the valve device according to any one of claims 1 to 5.

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