JPH0828742A - High-speed solenoid valve - Google Patents

Abstract

PURPOSE:To prevent the breakage or the like of a seal member from occurrence, improve the durability in a high speed solenoid valve and improve the sealing capability and surely prevent the occurrence of leakage or the like. CONSTITUTION:A valve element 8 comprises a seal member in contact with a valve seat 7 for closing channels 5 and 6, a seal cover provided around this seal member and a seal plate provided in the surface opposite to the surface of the seal member opposed to the valve seat. A cap member 18, which abuts against the seal cover upon opening operation and moves the valve element 8 with the movement of a plunger 15 while supporting the valve element 8, is provided on the end face part of the plunger 15 in the velve element 8 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high speed electromagnetic valve. More specifically, the present invention relates to a high-speed electromagnetic valve that can be applied to a pneumatic pellet injector that supplies fuel to a nuclear fusion device, a high-pressure gas facility that uses a pressure feed system, and the like.

[0002]

2. Description of the Related Art Conventionally, a plunger (movable iron core) has been used as a valve for controlling the introduction of various fluids such as gas.
Known are a solenoid valve in which a seal material such as rubber and rubber is integrated, and a high-speed solenoid valve having a structure in which a seal material such as a plunger, a cap and polyimide is separated.

In the former solenoid valve, the plunger and the seal material are integrated, and when a voltage is applied (energized) to the coil, the plunger of the integrated structure is pulled up as the current rises, and the seal material A fluid such as gas can flow through a gap formed between the valve seat and the valve seat. On the other hand, when the energization is stopped, the seal member and the valve seat come into contact with each other due to the urging force of the spring provided, and the flow is stopped by the sealing.

Further, in the latter high-speed solenoid valve, the plunger, the cap and the sealing material are separated from each other, and when the coil is energized, the current rises,
First, the plunger and the cap operate to accelerate the accelerating force, and when the high speed operation is achieved, the sealing material is latched, thereby pulling up the sealing material and forming a gap with the valve seat. A fluid such as a gas can flow through this gap. On the other hand, when the energization is stopped, the plunger and the seal material receive the urging force of the springs respectively provided on the plunger and the seal material, and the seal material seals the valve seat, and the fluid flow is stopped.

[0005]

However, in the case of a solenoid valve in which the plunger and the seal material are integrated, the seal material is fitted into the plunger and then caulked to integrate the plunger and the seal material. Therefore, during the closing operation, the seal member and the valve seat abut against each other due to the biasing force of the spring. As a result, there has been a problem that the seal surface is damaged or the seal material is detached from the plunger to cause a leak or the like.

Further, in the case of a high speed solenoid valve in which the plunger, the cap and the seal material are separated, the seal material is suddenly latched during the opening operation, and the seal material is applied to the valve seat by the biasing force of the spring during the closing operation. At the time of contact, there is a problem that an impact force is applied to the latch portion of the seal material, the seal material is damaged, and a leak or the like occurs. The present invention has been made in view of the above circumstances, solves the drawbacks of the conventional electromagnetic valve, prevents damage to the sealing material, etc. to improve durability, and also improves sealing performance. It is an object of the present invention to provide an improved high-speed electromagnetic valve capable of reliably preventing the occurrence of leaks and the like.

[0007]

In order to solve the above-mentioned problems, the present invention has a valve seat provided in a fluid passage formed in a valve body, and a valve body for opening and closing the valve seat is a valve. It is connected via a first elastic body to a fixed shaft arranged coaxially with the seat, and the first elastic body is biased so as to push the valve body toward the valve seat, and the plunger is fixed. A second elastic body, which is arranged so as to be slidable along the shaft and is biased so as to push the plunger toward the valve seat, is connected to the plunger. A coil is arranged around the plunger. A high-speed electromagnetic valve capable of sliding movement along a fixed axis of a plunger by these coils and a second elastic body, the valve body contacting a valve seat and closing a flow path; A seal cover placed around this seal material And a seal plate disposed on the surface of the seal member opposite to the valve seat facing surface, and supports the valve element by abutting against the seal cover at the opening operation at the end surface of the plunger on the valve element side. However, a high-speed electromagnetic valve is provided, which is provided with a cap body that moves this along with the movement of the plunger.

[0008]

[Operation] In the high-speed electromagnetic valve of the present invention, a valve seat is provided in the fluid passage formed in the valve body, and the valve body for opening and closing the valve seat is mounted on a fixed shaft arranged coaxially with the valve seat. Via a first elastic body, the first elastic body urges the valve body to be pushed out toward the valve seat, and the plunger is slidably arranged along its fixed axis.
A second elastic body that is biased to push it toward the valve seat is connected to this plunger, and a coil is arranged around the plunger, and these coils and the second elastic body are used to fix the fixed shaft of the plunger. It is possible to slide along. In addition, the valve body is provided with a seal material that contacts the valve seat to close the flow path, a seal cover that is disposed around the seal material, and a surface of the seal material that is opposite to the valve seat facing surface. A cap body that is configured to move along with the movement of the plunger while supporting the valve body and abutting against the seal cover at the time of opening operation. To do.

When the coil is energized, a suction force is generated, the plunger moves along the fixed shaft, the cap body contacts the seal cover, and the valve body is supported at a high speed to be separated from the valve seat. Form a gap with the valve seat. A fluid such as gas can be flowed through the gap to a flow path formed in the valve body. On the other hand, when the energization of the coil is stopped, the suction force disappears, the plunger is pushed back by the urging force of the second elastic body, and the support of the valve body by the cap body is released. As a result, the valve body is pushed out in the valve seat direction by the urging force of the first elastic body, and the sealing material comes into contact with the valve seat. This blocks the fluid flow path.

As described above, in the high-speed electromagnetic valve of the present invention, even if the cap body latches the valve body by the movement of the plunger during the opening operation, the sealing material is not directly latched and the cap body is sealed. Latch the cover.
Therefore, the latch force applied when the plunger moves at a high speed can be received by the seal cover, and the seal material provided on the valve body is protected by the seal cover.

Further, during the closing operation, the valve body moves only by the urging force of the first elastic body and contacts the valve seat. Therefore, it is possible to prevent the sealing material from impactingly contacting the valve seat. Further, since the urging force of the first elastic body acts on the sealing material via the sheet plate, the urging force does not concentrate on the sealing material and acts on the sealing material as a uniform surface pressure by the sealing plate. Can be done. The impact force at the time of contact with the valve seat is reduced.

In this way, the sealing material is not damaged even when the valve body is opened and closed, and the durability is improved.
At the same time, the sealing material effectively makes surface contact with the valve seat, and the sealing performance of the valve seat is improved. The occurrence of leaks is surely prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The high-speed electromagnetic valve of the present invention will be described below in more detail with reference to the drawings. FIG.
FIG. 4 is a partial sectional view showing an embodiment of the high speed electromagnetic valve of the present invention. In the example of FIG. 1, a valve body (1) and a backless sleeve (2) connected thereto are provided, and the valve body (1) and the backless sleeve (2) are sleeve nuts. They are interconnected by (3). Further, a metal packing (4) is interposed in the connecting surface portion of the backless sleeve (2) with the valve body (1) to enhance airtightness.

The valve body (1) is provided at its side with an inlet passage (5) for a fluid such as a gas extending horizontally and an outlet passage (6) in the vertical direction.
The introduction path (5) and the outflow path (6) communicate with each other to form a fluid flow path. A valve seat (7) is provided at the top of the outflow passage (6). A valve body (8) is arranged above the valve seat (7). This valve body (8) is built in the backless sleeve (2). When the valve body (8) moves downward and comes into contact with the valve seat (7), the flow passage is closed and the flow of fluid is stopped. On the other hand, when the valve body (8) moves upward and separates from the valve seat (7), a gap is formed between the valve body (8) and the valve seat (7), the flow path opens, and the inflow of the fluid flows. And spills are made.

2A and 2B are a plan view and a cross-sectional view, respectively, showing the valve body illustrated in FIG. 1 in an enlarged manner. As illustrated in FIGS. 2a and 2b, the valve body (8) is provided with a sealing material (9) formed in a substantially cylindrical shape. This sealing material (9) directly contacts the above-mentioned valve seat (7). A seal cover (10) is attached to the outer periphery of the seal material (9).
0) protects the sealing material (9). further,
A disc-shaped sealing plate (11) is arranged on the top of the sealing material (9).

In the example of FIG. 1, the spring rod (1) serving as a fixed shaft is provided inside the backless sleeve (2).
2) is provided coaxially with the valve seat (7). The valve body (8) is connected to the spring rod (12) via the spring (13) as the first elastic body. That is, the spring (13) is inserted between the spring rod (12) and the seal plate (11) of the valve body (8) illustrated in FIGS. 2A and 2B, and the spring (13) is inserted into the valve body (8). ) Is pushed downward toward the valve seat (7). By the urging force of the spring (13), the sealing material (9) of the valve body (8) comes into contact with the valve seat (7), and the fluid flow path can be closed. Also, as illustrated in FIGS. 2a and 2b,
The surface of the seal plate (11) has a circular groove (14) to prevent the spring (13) from being misaligned during the operation of the high speed electromagnetic valve.
Is also formed. In this way, the biasing force of the spring (13) is prevented from concentrating on the seal material (9) by interposing the seal plate (11) without directly connecting the spring (13) to the seal material (9). It is possible to disperse the urging force by the seal plate (11) to act on the seal material (9) as a uniform surface pressure.

A plunger (15) is provided on the outer periphery of the spring rod (12) so as to be vertically slidable along the spring rod (12). A spring (16) as a second elastic body is provided at the upper end of the spring rod (12), and the spring (16) is inserted into a recess formed in the upper end of the plunger (15). . The spring (16) connects the plunger (15) to the valve seat (7).
The urging force acts so as to push downward in the direction. A cap body (18) having a flange portion (17) protruding inward is fixed to an end surface portion of the plunger (15) on the valve body (8) side, that is, a lower end portion. These valve body (8), plunger (15) and cap body (1)
FIG. 3 is an enlarged view of 8).

As shown in FIG. 3, the cap body (1
The flange portion (17) protruding inward of 8) is a flange portion (19) provided on the upper end portion of the seal cover (10) of the valve body (8) when the high speed electromagnetic valve shown in FIG. 1 is opened. ) From below and can support the valve body (8).
Further, in the example of FIG. 1, the backless sleeve (2)
A coil (20) is arranged on the outer periphery of the. The coil (20) is inserted between the core (21) and the ring core (22) provided at the upper end of the backless sleeve (2) and fixed in the bonnet (23). The core (21) and the ring core (22) are connected to the top of the backless sleeve (2) by a bolt (25) via a bonnet piece (24). Coil (2
0) is the spring rod (1) of the plunger (15) described above.
The slide movement in the vertical direction along 2) is automatically performed.

For example, the high-speed electromagnetic valve having the above structure operates as follows. That is, when a voltage is applied to the coil (20), a suction force is generated between the core (21) and the ring core (22) and the plunger (15), which resists the biasing force of the spring (16). 15) is pulled up and slides upward at high speed along the spring rod (12). Then, the cap body (18) provided at the lower end portion of the plunger (15) comes into contact with the upper end flange portion (19) of the seal cover (10) at the flange portion (17) thereof, while supporting the valve body (8). With the movement of the plunger (15), pull it up. At this time, the spring (13) and the spring (16) are both compressed.

By the way, a step portion (26) is formed at an intermediate portion of the backless sleeve (2), and a stopper ring (27) is attached to the cap body (18). Therefore, the cap body (18) moves upward together with the plunger (15), but after the stopper ring (27) comes into contact with the stepped portion (26) of the backless sleeve (2), the plunger (15) moves. Movement is blocked. In this state, a gap is formed between the valve body (8) and the valve seat (7), and a fluid such as gas introduced into the valve body (1) from the introduction passage (5) through this gap. Can be discharged to the discharge channel (6).

Thus, during the opening operation, the plunger (1
Even if the cap body (18) latches the valve body (8) by the movement of 5), the seal material (9) is not directly latched, and the cap body (18) latches the seal cover (10). . Therefore, the seal cover (10) can receive the shocking latching force applied when the plunger (15) moves at high speed, and the seal material (9) can be received by the seal cover (1).
Safely protected by 0). It is possible to prevent damage to the sealing material (9) during the opening operation.

On the other hand, when the voltage application to the coil (20) is stopped, the attraction force between the core (21) and the ring core (22) and the plunger (15) disappears, and as shown in FIG. 16) by the urging force of the plunger (1
5) is pushed back and slides downward along the spring rod (12). Then, the support of the valve body (8) by the cap body (18) is released, and at the same time, the spring (1
3) extends and pushes the valve body (8) downward. Therefore, the valve body (8) contacts the valve seat (7), and the valve seat (7) is closed by the sealing material (9). The fluid flow path is closed.

The valve body (1) is provided with a stopper (28). When the cap body (18) comes into contact with the stopper (28), the plunger (15) is
Movement is stopped. Thus, during the closing operation, the valve body (8) moves only by the biasing force of the spring (13),
Abut the valve seat (7). For this reason, the sealing material (9) does not impactly contact the valve seat (7). The sealing material (9) is prevented from being damaged during the closing operation, and will not come off even when the sealing material (9) is made of a material such as rubber. Further, since the urging force of the spring (13) acts on the seal material (9) via the seat plate (11), the urging force does not concentrate on the seal material (9) and the seal plate (11) ), It can be made to act on the sealing material (9) as a uniform surface pressure. The impact force when the seal material (9) contacts the valve seat (7) is mitigated. Moreover, the sealing material (9) effectively makes surface contact with the valve seat (7), and the sealing performance of the valve seat (7) is improved.

The high-speed electromagnetic valve generally operates in a few milliseconds (msec), but the sealing material (9) is not damaged even by such a high-speed opening / closing operation, the durability is improved, and the valve seat is The sealing property of (7) is also improved. It is possible to reliably prevent the occurrence of leaks and the like. The material of the sealing material (9) can be optimized by applying a high-speed electromagnetic valve to various directions such as a pneumatic pellet injection device and a pressure-feeding high-pressure gas facility. For example, rubber, Teflon, Various materials such as polyimide can be used. Further, as the material of the seal cover (10) and the seal plate (11), an appropriate material such as stainless steel or synthetic resin is selected according to the material of the seal material (9), and the seal material (9) is selected. It can be well protected.

FIG. 5 is a sectional view showing the overall structure of the high speed electromagnetic valve illustrated in FIG. As illustrated in FIG. 5, the valve body (1) is provided with an inlet (29) for a fluid such as gas on the extension of the inlet passage (5), and the lower end of the outlet passage (6). An outflow port (30) is formed in this. And in the example of this FIG. 5, the screw-in joint (31) is connected to the inlet (29) and the VCR gland (3
2), gasket with VCR terina (33) and VCR
Female nuts (34) are sequentially connected. By connecting the screw-in joint (31) to the inlet port (29) in this way, it is possible to prevent leakage and the like even when used in a high temperature atmosphere or a high pressure gas atmosphere, and to replace the valve alone. Etc. can be facilitated and maintainability can be improved.

In both the conventional solenoid valve and the high-speed solenoid valve, a metal gasket, a metal packing or the like is used to fix the flange with a plurality of bolts, nuts or the like in order to engage with the primary side (fluid supply side). Alternatively, when used at high pressure, the solenoid valve and the piping etc. were connected by welding. However, when used in a high-temperature atmosphere or a high-pressure gas atmosphere, the seal material such as rubber and the mating flange portion are subject to thermal expansion and the torque of bolts is insufficient, so that leakage is likely to occur. In the case of the high-speed electromagnetic valve of FIG. 5, by using the screw-in joint (31), it is possible to prevent the occurrence of leakage at the joint with the primary side. Moreover, maintenance becomes easy.

Of course, the present invention is not limited to the above examples. It goes without saying that various aspects are possible in terms of details such as the materials and shapes of the sealing material, the seat cover and the seat plate, and the types of the first and second elastic bodies.

[0028]

As described above in detail, according to the present invention, it is possible to prevent the sealing material provided in the high-speed electromagnetic valve from being damaged and to improve the sealing property of the valve seat. The occurrence of leaks is surely prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a high-speed electromagnetic valve of the present invention.

2A and 2B are a plan view and a cross-sectional view showing an enlarged valve body of the example of FIG. 1, respectively.

3 is an enlarged cross-sectional view of a valve body, a plunger, and a cap body illustrated in FIG.

FIG. 4 is a partial cross-sectional view showing a closed state of the example of FIG.

FIG. 5 is a cross-sectional view illustrating the overall structure of the high speed electromagnetic valve of the present invention.

[Explanation of symbols]

 1 Valve Body 2 Backless Sleeve 3 Sleeve Nut 4 Metal Packing 5 Inlet Path 6 Outflow Path 7 Valve Seat 8 Valve Body 9 Sealing Material 10 Seal Cover 11 Seal Plate 12 Spring Rod 13 Spring 14 Circular Groove 15 Plunger 16 Spring 17 Collar 18 Cap Body 19 Upper end flange 20 Coil 21 Core 22 Ring core 23 Bonnet 24 Bonnet piece 25 Bolt 26 Stepped portion 27 Stopper ring 28 Stopper 29 Inlet 30 Outlet 31 Screw-in joint 32 VCR gland 33 VCR Terryner gasket 34 VCR female nut

Claims (2)

[Claims] 1. A valve seat is provided in a fluid passage formed in a valve body, and a valve element for opening and closing the valve seat has a first elastic body on a fixed shaft arranged coaxially with the valve seat. The first elastic body is biased so as to push the valve body toward the valve seat, and the plunger is slidably arranged along its fixed axis. Is connected to a second elastic body that is urged to push the valve seat toward the valve seat, and a coil is arranged around the plunger. The coil and the second elastic body extend along the fixed axis of the plunger. A high-speed electromagnetic valve capable of sliding movement, in which the valve body includes a seal member that contacts the valve seat to close the flow path, a seal cover disposed around the seal member, and a seal member. Seal plate disposed on the surface opposite to the valve seat facing surface And a cap body that abuts on the seal cover during the opening operation and that moves the plunger along with the movement of the plunger while supporting the valve body at the end face portion on the valve body side of the plunger. Features a high-speed solenoid valve. 2. The high-speed electromagnetic valve according to claim 1, wherein a threaded joint is provided on the fluid introduction side of the flow passage provided in the valve body.