JPH0526390Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a valve used in an industrial machine that utilizes fluid pressure or vacuum pressure, and more specifically relates to a valve having a fluid leakage detection chamber.

[Prior Art] A valve in which a valve body for opening and closing a valve seat is formed of two diaphragms, and a space between these diaphragms is opened to the outside to form a fluid leakage detection chamber is disclosed, for example, in Japanese Patent Laid-Open No. 55
These valves are known from Japanese Patent Laid-open No. 155968 and Japanese Patent Laid-Open No. 14678/1983, and these valves are provided with a hole in the center of each diaphragm in order to displace the two diaphragms integrally. A pressing member such as a movable iron core is attached to the hole.

Therefore, in these valves, fluid leaked from the leak detection chamber may further leak from the leak detection chamber due to improper attachment of the pressing member to the hole in the diaphragm.

However, if the fluid flowing through the fluid chamber is, for example, a corrosive fluid, if this fluid flows out from the leak detection chamber into the operating section, there is a risk of damage to the operating section or contamination of the external environment. It is necessary to reliably prevent fluid from leaking again from the detection chamber.

Furthermore, in the above-mentioned known valve, if the pressing member and the two diaphragms are eccentric, the diaphragms are prone to damage, making centering difficult.

[Problem to be solved by the invention] The problem to be solved by the invention is to provide a valve with a leakage detection chamber that can reliably prevent fluid leaked into the leakage detection chamber from further leaking from the leakage detection chamber. It's about doing.

[Means for Solving the Problems] In order to solve the above problems, the present invention has an inlet port, an outlet port, and a fluid chamber that communicates the two ports, and a valve seat between the two ports is provided in the fluid chamber. a valve body provided with a valve body, a valve body that opens and closes the valve seat,
In the valve, the valve includes an operating part that drives the valve body, and a fluid leakage detection chamber that opens to the outside and is formed between the valve body and the operating part, and the valve body has a thin film-like structure that opens and closes the valve seat. a valve member, a thin film-like sealing member on the operation part side, a protrusion provided integrally at the center of these members for displacing both members together, and a space between the outer peripheral portions of these members. A pedestal is provided which is formed integrally with or separately from the valve member, and the outer peripheral portions of the valve member and the sealing member in the valve body are held between the valve body and the operating section, and the fluid chamber and the operating section are controlled by these members. These members and the pedestal constitute the leakage detection chamber, and the operating section includes a pressing member that comes into contact with and presses the valve body.

[Function] When the pressing member is operated, the valve member and the sealing member are integrally displaced by the protrusions provided at the central portions of the valve member and the sealing member, so it is not necessary to fix the pressing member and the valve body. Also, the valve body opens and closes the valve seat.

In this case, the spaces between the leak detection chamber, the fluid chamber, and the operating section are sealed by the thin film-like valve member and sealing member that constitute the valve body, preventing re-leakage between the valve body and the pressing member. Since there is no hole, re-leakage of fluid from the leakage detection chamber due to improper attachment of the valve body and the pressing member can be reliably prevented.

Furthermore, since the pressing member and the valve body are not fixed, alignment of these members is simple and assembly is easy.

[Embodiment] Fig. 1 shows an embodiment of the present invention, in which a valve body 1 has an inlet port 2, an outlet port 3, and a fluid chamber 4 that communicates both ports, and a valve seat 5 is provided in the fluid chamber 4. It is being

The valve seat 6 provided in the fluid chamber 4 to open and close the valve seat 5 is arranged so that the peripheral edge of the thin film-like valve member 7 on the valve seat 5 side and the thin film-like sealing member 8 on the opposite side is It has a structure connected by an annular pedestal 10 provided with a plurality of through holes 9 in the direction, and a protrusion 11 at the center of the sealing member 8.
By locking the tip of the valve member 7 to the locking portion 12 at the center of the valve member 7, both the members 7 and 8 are configured to be able to be displaced as one unit, and are partitioned by the valve member 7, the sealing member 8, and the pedestal 10. This space is designated as a leakage detection chamber 14.

On the other hand, a detection port 15 is opened at a location of the valve body 1 corresponding to the pedestal 10, and the leakage detection chamber 14 is opened to the outside of the valve body 1 via the through hole 9 and the detection port 15.

Further, a well-known electromagnetic operation section 20 consisting of an excitation coil 21, a fixed iron core 22, a movable iron core 23, a return spring 24, etc. is integrally attached to the valve body 1.
The tip of the movable iron core 23 constituting the pressing member is brought into contact with the back of the sealing member 8.

In the above-mentioned valve, when the excitation coil 21 is not energized, the valve member 7 of the valve body 6 closes the base 5 due to the biasing force of the return spring 24, as shown in FIG. Fluid flow at 4 is blocked. When the excitation coil 21 is energized in this state, the fixed core 22 attracts the movable core 23 against the biasing force of the return spring 24, so the fluid pressure from the inlet port 2 causes the valve body 6 to press against the valve seat 5. When opened, the fluid in the inlet port 2 flows out through the fluid chamber 4 and out the outlet port 3.

In the above-mentioned state, if the fluid in the fluid chamber 4 leaks to the electromagnetic operation unit 20 due to a seal failure or a pinhole on the valve member 7 side, for example, this fluid will first leak into the leak detection chamber 14. do.
Therefore, by connecting an appropriate leakage detector, leakage fluid collector, etc. to the detection port 15, fluid leakage can be detected at an early stage.

In addition, a valve member 7 and a sealing member 8 that constitute the valve body 6 are also provided.
are integrally displaced by the protrusion 11, so the valve body can be displaced with the movable core 23 in contact with the valve body 6, so that the movable core 23, the valve member 7, and the sealing member 8 Fluid will not leak into the leakage detection chamber 14 due to improper installation or the like.

Furthermore, since the movable iron core 23 and the valve body 6 are simply in contact with each other, their alignment is simple and assembly is easy.

In the valve body of the above embodiment, the valve member and the base can be integrated, like the valve body 16 shown in FIG.

[Effects of the invention] The present invention seals the leakage detection chamber provided between the valve body and the operation part from the valve body and the operation part by a thin film-like valve member and a sealing member that constitute the valve body. In addition, by integrally providing a protrusion in the center of each of these members, the valve body can be displaced without attaching a pressing member to the valve body, so that fluid leaked into the leak detection chamber can be prevented from entering the operation part or the fluid. Re-leakage into the room can be reliably prevented.

Therefore, even if the fluid flowing through the valve body is likely to damage the operating section or contaminate the working environment, the operating section or the external environment will not be affected by the fluid.

Furthermore, since the pressing member is simply brought into contact with the valve body without being attached to it, alignment is simple and assembly is easy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention, and FIG. 2 is a longitudinal sectional front view showing a modification of the valve body. 1... Valve body, 2... Inlet port, 3... Outlet port, 5... Valve seat, 6, 16... Valve body, 10...
...Pedestal, 11...Protrusion, 14...Leak detection chamber,
15...Detection port, 20...Operation unit.

Claims (1)

[Scope of Claim for Utility Model Registration] A valve body having an inlet port, an outlet port, and a fluid chamber that communicates the two ports, and in which the fluid chamber is provided with a valve seat between the two ports, and a valve body that opens and closes the valve seat. In the valve, the valve includes a valve body that drives the valve body, an operating section that drives the valve body, and a fluid leakage detection chamber that opens to the outside and is formed between the valve body and the operating section, wherein the valve body is connected to the valve seat. A thin film-like valve member that opens and closes the valve member, a thin film-like sealing member on the operating section side, a protrusion provided integrally at the center of each of these members for integrally displacing both members, and these members. A pedestal formed integrally with or separately from the valve member is provided between the outer circumferential portions of the valve body, and the outer circumferential portions of the valve member and the sealing member of the valve body are held between the valve body and the operating portion, and these thin film-like members are Therefore, the fluid chamber and the operating section are individually sealed, and these members and the pedestal constitute the leakage detection chamber, and the operating section is provided with a pressing member that comes into contact with and presses the valve body. , A valve having a leakage detection chamber.