CN111075949A

CN111075949A - Valve device and electromagnetic valve

Info

Publication number: CN111075949A
Application number: CN201910920232.1A
Authority: CN
Inventors: 木村宏光
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2018-10-19
Filing date: 2019-09-26
Publication date: 2020-04-28
Anticipated expiration: 2039-09-26
Also published as: JP2020063820A; CN111075949B; JP6941087B2

Abstract

The invention provides a valve device and an electromagnetic valve, which can prevent fluid from remaining in a valve chamber under a valve closing state. A solenoid valve as a valve device is provided with a valve housing (1), an electromagnetic drive section (2), and a valve element (3), wherein the valve housing (1) is provided with a main body section (1A), a primary pipe section (1B), and a secondary pipe section (1C). A conical valve chamber (11) is provided in a main body section (1A), the valve chamber (11) has a mortar-shaped valve seat surface (12) having an inner diameter that decreases downward, an outlet port (14) is provided in a bottom portion of the valve seat surface (12) so as to open, and an inlet port (13) is provided in an intermediate portion of the valve seat surface (12) above the outlet port (14) so as to open. The valve element (3) is provided with a diaphragm (31), and the diaphragm (31) is provided with a contact surface (34) which is a part of a conical surface having a smaller inner diameter as the diaphragm moves downward. In the valve-closing position of the valve body (3), the close contact surface (34) is in close contact with the valve seat surface (12), and the inflow port (13) is closed.

Description

Valve device and electromagnetic valve

Technical Field

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

Background

Conventionally, as a valve device, there has been used a solenoid valve and an electric valve each including a valve chamber, a valve body movable in the valve chamber, an inlet port communicating with the valve chamber and into which a fluid is introduced, and an outlet port communicating with the valve chamber and out of which the fluid is introduced. As one of such valve devices, an electromagnetic valve used in an analyzer or the like for sending a fluid (liquid, reagent) out by a predetermined amount has been proposed (for example, see patent document 1). The electromagnetic valve described in patent document 1 includes: a diaphragm (valve core) dividing the valve chamber into two halves; an inflow port that opens at a substantially center of a bottom surface of the valve chamber; and an outflow port opened at a position separated from the center of the bottom surface.

In this solenoid valve, an elastic valve seat is attached to the inflow port, and an annular protrusion of the valve seat protrudes toward the valve chamber side. When the solenoid valve is closed, the descending valve body first comes into contact with the annular protruding portion to close the inlet port and stop the inflow of fluid into the valve chamber, and then the valve body further descends to press the annular protruding portion to contract and bring the diaphragm into close contact with the bottom surface of the valve chamber, thereby allowing the fluid in the valve chamber to flow out from the outlet port.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 8-277960

Disclosure of Invention

Problems to be solved by the invention

However, in the conventional valve device described in patent document 1, the annular protruding portion of the valve seat is pressed to contract and the diaphragm is brought into close contact with the bottom surface of the valve chamber, so that the diaphragm comes into contact with the bottom surface from the outer peripheral side thereof and the inner peripheral side of the periphery of the annular protruding portion comes into contact with the bottom surface last. Therefore, the outflow port is closed before the inner peripheral side of the diaphragm abuts against the bottom surface of the valve chamber, and there is a possibility that the fluid remains in the valve chamber. Further, if the annular protrusion cannot be sufficiently contracted due to deterioration of the valve seat, insufficient driving force, or the like, a gap may be formed between the diaphragm around the annular protrusion and the bottom surface of the valve chamber, and in this case, a problem of remaining fluid in the valve chamber may also occur. If the fluid remains in the valve chamber as described above, the fluid amount and concentration may change at the time of delivery at the next valve opening, which may cause a measurement error to cause a decrease in analysis accuracy. In addition, when the valve chamber is purged, the purge level may be lowered by the influence of the remaining fluid.

The invention aims to provide a valve device and a solenoid valve, which can prevent fluid from remaining in a valve chamber in a valve closing state.

Means for solving the problems

The valve device of the present invention includes a valve chamber, a valve body movable in the valve chamber, an inflow port communicating with the valve chamber and introducing a fluid, and an outflow port communicating with the valve chamber and discharging the fluid, and is characterized in that the valve chamber has a mortar-shaped valve seat surface having an inner diameter that decreases downward, the outflow port is provided in a bottom portion of the valve seat surface so as to open, the inflow port is provided in an intermediate portion of the valve seat surface above the outflow port so as to open, the valve body has a contact surface provided to face the valve seat surface, and is provided so as to be movable between a valve opening position where the contact surface is separated from the valve seat surface to open the inflow port and a valve closing position where the contact surface is brought into contact with the valve seat surface to close the inflow port.

According to the present invention, since the outflow port is provided at the bottom of the mortar-shaped valve seat surface and the inflow port is provided at the middle portion of the valve seat surface above the outflow port, the fluid can easily flow down along the valve seat surface to the outflow port, and the close contact surface of the valve body is brought into close contact with the valve seat surface at the valve closing position to close the inflow port, thereby preventing the fluid from flowing into the valve chamber, and making it difficult to leave the fluid in the valve chamber.

In this case, it is preferable that the valve body gradually expands a close contact region from an upper end side of the valve seat surface located above the inflow port toward the outflow port in accordance with a valve closing movement from the valve opening position toward the valve closing position, and the close contact surface is brought into close contact with the valve seat surface.

With this configuration, as the valve element moves to close the valve, the close contact area gradually expands from the upper end side of the valve seat surface toward the outlet port, and the close contact surface comes into close contact with the valve seat surface, so that the fluid can be pressed toward the outlet port, and the fluid can be more reliably discharged from the valve chamber.

Further, it is preferable that the valve body has an elastic body that constitutes the close contact surface and is elastically deformable, and in the open valve position, a separation distance between the close contact surface and the valve seat surface is wider than an upper end side and a lower end side of the valve seat surface, and the elastic body is elastically deformed as the valve closes, thereby gradually expanding a close contact region and making the close contact surface and the valve seat surface closely contact each other.

With this configuration, the distance separating the close contact surface of the valve body from the valve seat surface is increased on the lower end side of the valve seat surface, and the elastic body of the valve body is elastically deformed as the valve closes, and the close contact region is gradually expanded, and the close contact surface is brought into close contact with the valve seat surface, whereby the close contact surface can be sequentially brought into contact with the upper end side of the valve seat surface as the valve closes, and the fluid can be more reliably pressed toward the outlet port.

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

According to this configuration, the valve body has the pressing portion, and the pressing portion presses the elastic body toward the inlet port, whereby the inlet port can be reliably closed at the valve-closed position, and even if the pressure in the inlet port abnormally increases, the 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 that urges the elastic body from a side opposite to the adhesion surface toward the valve seat surface.

According to this configuration, the valve body has the biasing portion, and the biasing portion biases the elastic body toward the valve seat surface, so that the contact surface of the elastic body can be brought into contact with the valve seat surface while being bent in an appropriate shape during the valve closing movement, and the elastic body can be appropriately brought into contact with the valve seat surface at the valve closing position.

Further, it is preferable that the valve body has a diaphragm that seals the valve chamber, a peripheral portion of the diaphragm is held in close contact with an upper end edge of the valve seat surface, and the close contact surface is formed by a surface of the diaphragm on the valve chamber side.

According to this configuration, the valve body has the 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 close contact surface of the diaphragm surface can be sequentially brought into contact with the upper end edge of the valve seat surface in accordance with the movement of closing the valve. Further, by sealing the valve chamber with the diaphragm, leakage of the fluid to the outside of the valve chamber can be prevented.

The solenoid valve according to the present invention includes an electromagnetic drive portion that moves a plunger disposed in a plunger housing so as to face an attracting member in an axial direction of the plunger housing to drive a valve element, and is characterized by including the valve chamber, the valve element, the inlet port, and the outlet port of any one of the valve devices.

According to the present invention, it is possible to realize a solenoid valve in which fluid is less likely to remain in a valve chamber in a valve closed state, as in the case of the above-described effects of the valve device.

Effects of the invention

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

Drawings

Fig. 1 is a longitudinal sectional view showing a valve-open state when a solenoid valve according to an embodiment of the present invention is energized.

Fig. 2 is a vertical cross-sectional view showing a closed state of the solenoid valve in a non-energized state.

Fig. 3 (a) to (C) are enlarged cross-sectional views showing a first modification of the solenoid valve.

Fig. 4 (a) to (C) are enlarged cross-sectional views showing a second modification of the solenoid valve.

Fig. 5 is an enlarged cross-sectional view showing a third modification of the solenoid valve.

Fig. 6 (a) to (C) are enlarged cross-sectional views showing a fourth modification of the solenoid valve.

Fig. 7 is an enlarged longitudinal sectional view of a main portion of a valve device according to a modification of the present invention.

In the figure:

2-electromagnetic drive portion, 3-valve core, 11-valve chamber, 12-valve seat surface, 13-inflow port, 14-outflow port, 21-plunger housing, 22-suction member, 23-plunger, 31-diaphragm, 33-elastic body, 34-adhesion surface, 35-pressing portion, 36-forcing portion.

Detailed Description

A solenoid valve as a valve device according to an embodiment of the present invention will be described with reference to fig. 1 to 6. As shown in fig. 1 and 2, the solenoid valve of the present embodiment includes a valve housing 1, an electromagnetic drive portion 2, and a valve body 3. The concept of "up and down" in the following description corresponds to the up and down of the drawings of fig. 1 and 2. The solenoid valve is used to send a predetermined amount of fluid supplied from a supply source to a supply target. As the fluid, various liquids such as a chemical solution, various gases, and the like can be arbitrarily selected, and both a gas such as a gas-liquid two-phase refrigerant and a liquid can be in a state.

The valve housing 1 is an integrally molded resin component, and includes a generally cylindrical main body portion 1A, a tubular primary pipe portion 1B that protrudes laterally from the main body portion 1A and is connected to a supply source, and a tubular secondary pipe portion 1C that protrudes downward from the main body portion 1A and is connected to a supply destination. The valve housing 1 is not limited to an integrally molded component made of resin, and may be made of metal, or may be formed by combining a plurality of members. 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 centered on the axis X is formed from the step portion 10 toward the lower portion. The axis X is also a center line of the plunger housing 21 described later.

The valve chamber 11 has a mortar-shaped valve seat surface 12 whose inner diameter decreases downward. Further, the valve housing 1 includes: an inlet port 13 extending through the body 1A and the primary pipe 1B in the left-right direction, communicating with the valve chamber 11, and into which fluid is introduced; and an outlet port 14 extending vertically through the main body 1A and the secondary pipe portion 1C, communicating with the valve chamber 11, and through which the fluid is led out. The outlet port 14 is provided so as to open at the bottom of the seating surface 12, and the inlet port 13 is provided so as to flex upward inside the main body portion 1A and to open at the middle portion of the seating surface 12 above the outlet port 14.

The electromagnetic drive unit 2 includes a plunger housing 21 made of a non-magnetic material, an attraction piece 22 made of a magnetic material fixed to an upper end of the plunger housing 21, a plunger 23 disposed in the plunger housing 21 so as to face a lower side of the attraction piece 22, and a plunger spring 24 disposed between the attraction piece 22 and the plunger 23. The electromagnetic drive unit 2 includes a bobbin 25 disposed on the outer periphery of the plunger housing 21, an electromagnetic coil 26 formed by winding a wire around the bobbin 25, a case 27 in which the bobbin 25 and the electromagnetic coil 26 are disposed, a yoke 28 for securing a magnetic path from the lower portion of the case 27 toward the plunger 23 and the suction piece 22, and a fixing ring 29 fastened to the plunger housing 21 at a lower surface position of the case 27.

The plunger housing 21 defines a plunger chamber 21a in the interior formed in a cylindrical shape, and is fixed to the suction tool 22 by welding or the like so as to cover the suction tool 22 with a part of the side surface thereof. The suction unit 22 includes a mortar-shaped suction surface 22a opening on the plunger 23 side and a spring contact member 22b held between the suction unit 22 and the plunger spring 24. The plunger 23 is made of an appropriate magnetic material so as to be attracted by the attraction piece 22, is housed in the plunger chamber 21a, and has a tapered portion 23a and a spring housing hole 23b that houses the plunger spring 24 on the attraction piece 22 side. The plunger 23 has upper and lower two-stage sliding contact rings 23c that are in sliding contact with the inner peripheral surface of the plunger housing 21, and is provided so as to be movable in the axis X direction. Further, the plunger 23 has a projecting shaft portion 23d extending downward, holds the diaphragm 31 at a tip end portion of the projecting shaft portion 23d, and is provided with a valve body base portion 32 constituting a part of the valve body 3.

The valve body 3 is constituted by a diaphragm 31 and a valve body base portion 32 of the plunger 23. The diaphragm 31 is made of rubber, has a substantially disk-like shape as a whole, and has an inner curl portion 31a at the center of the upper surface and an outer curl portion 31b at the outer periphery. Then, the diaphragm 31 is mounted between the valve housing 1 and the electromagnetic driving portion 2 by the inner curl portion 31a being held between the protruding shaft portion 23d and the valve body base portion 32 and the outer curl portion 31b being sandwiched between the fixing ring 29 and the step portion 10 of the valve housing 1. Thereby, the diaphragm 31 hermetically seals the valve chamber 11 of the valve housing 1 and the plunger chamber 21a of the electromagnetic drive portion 2. The diaphragm 31 has an elastic body 33 formed in a truncated cone shape with the axis X as a center line and capable of elastic deformation, and a contact surface 34 is provided on the lower surface side of the elastic body 33, and the contact surface 34 is a part of a conical surface whose inner diameter becomes smaller as it goes downward and has substantially the same shape as the valve seat surface 12.

In the above-described electromagnetic valve, when current is applied as shown in fig. 1, that is, when current is applied to the electromagnetic coil 26, a suction force is generated between the suction tool 22 and the plunger 23, the plunger 23 and the valve body 3 are raised, the abutting surface 34 of the diaphragm 31 of the valve body 3 is separated from the valve seat surface 12, and the inlet port 13 and the outlet port 14 are opened, thereby achieving a valve-open state. In this way, the solenoid valve of the present embodiment is an "energized open-specification" solenoid valve that is brought into a valve-open state (valve-open position) by energization. In such an open valve state, the fluid that has flowed into the valve chamber 11 from the inlet port 13 smoothly flows out from the outlet port 14.

On the other hand, when no current is applied as shown in fig. 2, that is, when no current is applied to the electromagnetic coil 26, the plunger 23 and the valve body 3 are biased downward by the biasing force of the plunger spring 24, and the close contact surface 34 of the diaphragm 31 of the valve body 3 is brought into close contact with the valve seat surface 12 to close the inlet port 13, thereby bringing the valve into a valve-closed state (valve-closed position). In such a closed valve state, the fluid flowing into the 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, so that the fluid does not remain in the valve chamber 11.

In the solenoid valve of the present embodiment, the seat surface 12 of the valve chamber 11 and the abutting surface 34 of the valve body 3 are substantially the same shape formed by a part of a conical surface, and are not limited to shapes that are provided substantially parallel to each other in the valve-opened state and that abut substantially the entire surface simultaneously with the valve-closing movement. That is, the seat surface 12 and the abutting surface 34 may have the following shapes: as the valve element 3 moves to close the valve, the close contact area gradually expands from the upper end side of the seating surface 12 located above the inlet port 13 toward the outlet port 14, and the close contact surface 34 closely contacts the seating surface 12. Further, the following shape is preferable: in the valve-opening position, the distance separating the adhesion surface 34 from the valve seat surface 12 is wider on the lower end side than on the upper end side of the valve seat surface 12, and the elastic body 33 of the diaphragm 31 is elastically deformed in accordance with the valve-closing movement of the valve body 3, whereby the adhesion region is gradually expanded, and the adhesion surface 34 is in close contact with the valve seat surface 12. Specifically, the shapes of the seat surface 12 and the abutting surface 34 as shown in fig. 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. 3 (a), the valve seat surface 12 and the abutting surface 34 of the solenoid valve according to the first modification are each formed by a portion of a conical surface, but the angle θ 2 formed by the abutting surface 34 and the axis X of the valve body 3 in the valve-open position is set to be larger than the angle θ 1 formed by the valve seat surface 12 and the axis X, and the distance separating the abutting surface 34 from the upper end side of the valve seat surface 12 is larger on the lower end side. As shown in fig. 3 (B), when the valve body 3 performs the valve closing movement, the seating surface 12 and the abutting surface 34 abut against each other from the upper end side of the seating surface 12, and the elastic deformation of the elastic body 33 deforms the abutting surface 34 in conformity with the seating surface 12, gradually expanding the abutting region downward, and pressing the fluid R toward the outlet port 14. Further, as shown in fig. 3 (C), when the valve body 3 is lowered to the closed valve position, the fluid R in the valve chamber 11 flows out from the outflow port 14 without remaining by closing the inflow port 13 with the abutting surface 34.

Fig. 4 is an enlarged cross-sectional view showing a second modification of the solenoid valve of the present embodiment. As shown in fig. 4 (a) to (C), in the solenoid valve according to the second modification, the seating surface 12 and the adhesion surface 34 are formed in a smooth curve (for example, an arc shape) that is convex upward in a vertical cross section, and the adhesion surface 34 is formed of a part of a conical surface and has a wider separation distance from the adhesion surface 34 at a lower end side than an upper end side of the seating surface 12. The abutting surface 34 is not limited to the valve seat surface 12, and may be formed of a smooth curve that is convex downward in a vertical section. As shown in fig. 4 (B), when the valve body 3 performs the valve closing movement, the seating surface 12 and the abutting surface 34 abut against each other from the upper end side of the seating surface 12, and the elastic deformation of the elastic body 33 deforms the abutting surface 34 in conformity with the seating surface 12, gradually expanding the abutting region downward, and pressing the fluid R toward the outlet port 14. Further, as shown in fig. 4 (C), when the valve body 3 is lowered to the closed valve position, the fluid R in the valve chamber 11 flows out from the outflow port 14 without remaining by closing the inflow port 13 with the abutting surface 34.

In the solenoid valve of the present embodiment, the valve body 3 is constituted by the diaphragm 31 and the valve body base portion 32 of the plunger 23, but may further include a pressing portion and an urging portion as shown in fig. 5 and 6 below. 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 of the solenoid valve according to the third modification includes a pressing portion 35, and the pressing portion 35 protrudes radially outward from the valve body base portion 32 of the plunger 23 and faces the inlet port 13 through the elastic body 33 of the diaphragm 31. The pressing portion 35 has an inclination substantially parallel to the valve seat surface 12, and is provided so as to cover an upper portion of the inflow port 13, and when the valve body 3 moves to the valve closing position, the elastic body 33 is pressed toward the inflow port 13 from the side opposite to the contact surface 34, and even if the pressure in the inflow port 13 abnormally increases, the elastic body 33 can be suppressed from being pushed up by the high-pressure fluid to cause valve leakage.

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 of the electromagnetic valve according to the fourth modification includes an urging portion 36, and the urging portion 36 protrudes radially outward from the valve body base portion 32 of the plunger 23 and faces the valve seat surface 12 through the elastic body 33 of the diaphragm 31. The biasing portion 36 is formed of a plate spring made of metal or resin, or the like, which is separate from the plunger 23, and is formed in a disk shape (disc shape) entirely covering the elastic body 33 on the side opposite to the contact surface 34. The biasing portion 36 may be formed of any material or shape as long as it exerts a biasing force (restoring force) by bending along with the valve closing movement of the valve body 3 to bias the elastic body 33 from the side opposite to the close contact surface 34 toward the valve seat surface. The biasing portion 36 is not limited to a plate spring or the like separate from the plunger 23, and may be formed of a thin plate-like portion protruding radially outward from the valve body base portion 32 integrally with the plunger 23, and the thin plate-like portion is bent to exert a biasing force.

As shown in fig. 6 (B), in the valve element 3 including such a biasing portion 36, when the valve element 3 performs a valve closing movement, the abutting surface 34 abuts against the upper end side of the valve seat surface 12, and the biasing portion 36 presses the elastic body 33 toward the valve seat surface 12 by its outer peripheral edge and deforms into a curved surface shape protruding downward, thereby biasing the elastic body 33 and elastically deforming into a curved surface shape protruding downward. Due to the deformation of the biasing portion 36 and the elastic body 33 accompanying the valve closing movement of the valve body 3, the contact surface 34 gradually expands the contact area from the upper end side of the valve seat surface 12 toward the outlet port 14, and contacts the valve seat surface 12 to press the fluid R toward the outlet port 14. Further, as shown in fig. 6 (C), when the valve body 3 is lowered to the closed valve position, the biasing portion 36 and the elastic body 33 are shaped along the seat surface 12, and the fluid R in the valve chamber 11 flows out from the outflow port 14 without remaining by the close contact surface 34 being in close contact with the seat surface 12 to close the inflow port 13.

According to the present embodiment described above, since 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, the fluid can easily flow to the outflow port 14 below 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 closing position to close the inflow port 13, thereby preventing the fluid from flowing into the valve chamber 11, and making it difficult to leave the fluid in the valve chamber 11.

The valve body 3 further includes 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 close contact surface 34 of the diaphragm 31 can be brought into contact with the valve seat surface 12 in order from the upper end edge of the valve seat surface 12 in accordance with the valve closing movement. Further, by sealing the valve chamber 11 and the plunger chamber 21a with the diaphragm 31, leakage of the fluid to the outside of the valve chamber 11 can be prevented.

As shown in fig. 3 and 4, the distance separating the abutting surface 34 of the valve body 3 from the valve seat surface 12 is increased on the lower end side of the valve seat surface 12, and the elastic body 33 of the valve body 3 is elastically deformed as the valve closes, and the abutting area is gradually expanded, and the abutting surface 34 abuts against the valve seat surface 12, whereby the fluid can be pressed toward the outflow port 14, and the fluid can be more reliably caused to flow out, and the fluid is less likely to remain 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, whereby the inflow port 13 can be reliably closed at the valve-closed position, and even if the pressure in the inflow port 13 abnormally increases, the elastic body 33 can be suppressed from being pushed up by the high-pressure fluid to cause valve leakage.

As shown in fig. 6, if the valve body 3 has the biasing portion 36, the biasing portion 36 biases the elastic body 33 toward the valve seat surface 12, so that the contact surface 34 of the elastic body 33 is brought into contact with the valve seat surface 12 while being bent in an appropriate shape during the valve closing movement, and the elastic body 33 is brought into contact with the valve seat surface 12 appropriately at the valve closing position.

The present invention is not limited to the above-described embodiments, and includes other configurations and the like that can achieve the object of the present invention, and modifications and the like described below 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 a motor-operated valve, a manual opening/closing valve, or the like. In the solenoid valve of the above embodiment, the valve body 3 has the diaphragm 31, and the abutting surface 34 is provided on the diaphragm 31, but the valve body is not limited to having the diaphragm, and may be the following valve body as shown in fig. 7.

Fig. 7 is an enlarged longitudinal sectional view of a main portion of a valve device according to a modification of the present invention. The valve device includes, as in the solenoid valve of the above embodiment: a valve housing 1 having a valve chamber 11, an inlet port 13, and an outlet port 14; and a valve body 3 having an elastic body 33. 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 contact surface 34 having substantially the same shape as the valve seat surface 12 on the lower surface of the overall cylindrical shape. The elastic body 33 is not limited to be made of rubber, and may be made of resin, and instead of the elastic body 33 of the valve body 3, a metal may be used, and the contact surface 34 may be formed only by a surface member made of rubber or resin. The valve body 3 is driven to advance and retract by a drive unit (not shown) and is provided so as to be movable between a valve opening position at which the close contact surface 34 is separated from the valve seat surface 12 to open the inlet port 13 as shown in fig. 7 (a) and a valve closing position at which the close contact surface 34 is brought into close contact with the valve seat surface 12 to close the inlet port 13 as shown in fig. 7 (B). As this drive means, a rotary drive unit such as a stepping motor and a screw feed mechanism may be provided by utilizing the suction force of the suction tool 22 and the plunger 23 as in the electromagnetic drive unit 2 of the above-described embodiment.

In the valve device of this modification as well, similarly to the above-described embodiment, by providing the outflow port 14 at the bottom of the mortar-shaped valve seat surface 12 and providing the inflow port 13 at the intermediate portion of the valve seat surface 12 above the outflow port 14, the fluid can easily flow down along the valve seat surface 12 to the outflow port 14, and by bringing the adhesion surface 34 of the valve body 3 into close contact with the valve seat surface 12 at the valve closing position to close the inflow port 13, the inflow of the fluid into the valve chamber 11 is prevented, and the fluid can be made difficult to remain in the valve chamber 11.

In the first and second modifications of the above embodiment, the valve body 3 has the elastic body 33 of the diaphragm 31, and the distance between the close contact surface 34 and the valve seat surface 12 is increased on the lower end side of the valve seat surface 12 in the valve opening position, and the elastic body 33 is elastically deformed to gradually expand the close contact region and the close contact surface 34 is in close contact with the valve seat surface 12 in accordance with the valve closing movement, but the present invention is not limited to this configuration. That is, the valve body may be configured not to have an elastic body, and the seating surface may be configured to be made of an elastic body, and the seating surface may be configured to be in close contact with the close contact surface while gradually expanding the close contact region by elastic deformation of the seating surface. Further, in the above embodiment, the valve body 3 is configured to linearly advance and retreat along the axis X, but the present invention is not limited thereto, and the valve body may move while following a curved or rotational motion, or may be configured such that the seating surface and the contact surface contact each other while gradually expanding the contact area downward from the upper end side of the seating surface by such movement of the valve body.

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

Claims

1. A valve device comprising a valve chamber, a valve body movable in the valve chamber, an inlet port communicating with the valve chamber and into which a fluid is introduced, and an outlet port communicating with the valve chamber and out of which the fluid is discharged,

the valve chamber has a mortar-shaped valve seat surface whose inner diameter decreases downward, the outlet port is provided by opening at the bottom of the valve seat surface, the inlet port is provided by opening at the middle part of the valve seat surface above the outlet port,

the valve body has a close contact surface provided to face the valve seat surface, and is provided to be movable between a valve opening position where the valve body is separated from the valve seat surface to open the inlet port and a valve closing position where the valve body closes the inlet port by bringing the close contact surface into close contact with the valve seat surface.

2. The valve device according to claim 1,

the valve body gradually expands a close contact area from an upper end side of the valve seat surface located above the inlet port toward the outlet port in accordance with a valve closing movement from the valve-open position toward the valve-closed position, and brings the close contact surface into close contact with the valve seat surface.

3. The valve device according to claim 2,

the valve body has an elastic body that constitutes the close contact surface and is elastically deformable, and in the open valve position, a distance separating the close contact surface and the valve seat surface is wider at a lower end side than at an upper end side of the valve seat surface, and the elastic body is elastically deformed to gradually expand a close contact region and to bring the close contact surface into close contact with the valve seat surface as the valve closes.

4. The valve device according to claim 3,

the valve body has a pressing portion that presses the elastic body from a side opposite to the close contact surface toward the inlet port.

5. The valve device according to claim 3 or 4,

the valve body has an urging portion that urges the elastic body from a side opposite to the close contact surface toward the valve seat surface.

6. The valve device according to any one of claims 1 to 5,

the valve body has a diaphragm that seals the valve chamber, a peripheral portion of the diaphragm is held in close contact with an upper end edge of the valve seat surface, and the close contact surface is formed by a surface of the diaphragm on the valve chamber side.

7. An electromagnetic valve including an electromagnetic drive portion that moves a plunger disposed in a plunger housing so as to face an attracting member in an axial direction of the plunger housing to drive a valve element, the electromagnetic valve being characterized in that,

the valve chamber, the valve body, the inlet port, and the outlet port of the valve device according to any one of claims 1 to 6.