JPH0553997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a gas cutoff valve, and more particularly, the present invention relates to an improvement in a gas cutoff valve, and more particularly, to a plunger operated by a solenoid or a manual operating rod, by removing a gas seal member from the plunger. This invention relates to a gas cutoff valve that can significantly reduce operating resistance and improve durability.

[Prior Art] In order to prevent gas from leaking from the gas distribution chamber to the valve operating mechanism storage chamber, a conventional gas cutoff valve has a solenoid S and a manual operation rod M, as shown in FIGS. 2 and 3. A gas seal member D, that is, a diaphragm D is directly attached between the plunger P operated by the casing C and the casing C, and this diaphragm D completely seals the gas distribution chamber 10 and the valve operating mechanism storage chamber 30. is isolated. Therefore, there are the following problems. That is, (1) When the plunger P is operated by the solenoid S, the valve operating mechanism storage chamber 30 is turned into an air damper by the diaphragm D, which adversely affects the operating performance of the solenoid S. In other words, since the solenoid S that operates the plunger P is pulse-driven and instantaneously energized, if the air damper phenomenon occurs as described above, the plunger P may return to its original state and the valve may not open or close. .

(2) Furthermore, the hardness of the diaphragm D changes due to a decrease in temperature, which adversely affects the operating performance of the solenoid S. That is, when the temperature of the gas decreases, the diaphragm D hardens and the operating resistance of the plunger P increases, so it is necessary to use a solenoid with a large capacity in advance.
As a result, the gas cutoff valve becomes larger and costs increase.

(3) Furthermore, since the diaphragm D is repeatedly deformed by the movement of the plunger P, there is a risk that durability may be reduced.

[Object of the Invention] The present invention has been achieved as a result of studies to solve the above-mentioned problems.

Therefore, an object of the present invention is to greatly reduce the operating resistance of the plunger and improve durability by removing the plunger operated by a solenoid or manual operating lever and the gas seal member that directly contacts the manual operating lever. An object of the present invention is to provide a gas cutoff valve that can improve the performance.

[Structure of the Invention] That is, the present invention includes a gas distribution chamber 10 in which a gas inlet 12 and a gas outlet 13 are communicated via a valve nozzle 11, and a gas distribution chamber 10 that is opposite to the valve nozzle 11 of the gas distribution chamber 10. Valve actuation mechanism 2 is provided inside.
0, and a valve body 40 that is operated by the valve operating mechanism 20 to open and close the valve nozzle 11.
0 is a solenoid S, a manual operating rod M arranged so as to extend from one end side of the solenoid S, and is located within the solenoid S and is driven by the solenoid S and the manual operating rod M, In a gas cutoff valve having a plunger P that drives the valve body 40 located on the other end side of the solenoid S, a cylindrical plunger sliding pipe 21 that guides the plunger P into the solenoid S.
A plunger holder 22 is provided on one end side of the plunger sliding pipe 21 to suck the plunger P.
A post nut 26 is provided at one end of the plunger holder 22 so as to surround the manual operating rod M, and one end of the post nut 26 is
closed with the manual operating rod M housed;
A manual button 27 is movably provided on the post nut 26, and the plunger sliding tube 21
A solenoid mounting holder 60 is provided so as to cover the entrance of the valve operating mechanism storage chamber 30 from the outer periphery of the other end, and a gap is formed between the plunger sliding pipe 21 and the plunger holder 22. A first gas seal member 51 for airtight maintenance is provided,
The plunger holder 22 and the post nut 2
A second gas seal member 52 is provided between the post nut 26 and the manual button 27 to keep the gap between them airtight, and a third gas seal member 52 is provided between the post nut 26 and the manual button 27 to keep the gap between them airtight. A gas seal member 53 is provided, and the solenoid mounting holder 60
and the vicinity of the entrance of the valve actuation mechanism storage chamber 30, a fourth gas seal member a is provided to keep the gap therebetween airtight, and the plunger sliding pipe 21
The gas flowing into the plunger sliding pipe 21 from the other end side is prevented from flowing out into the valve operating mechanism storage chamber 30, and the valve operating mechanism storage chamber 3
The valve actuating mechanism storage chamber 30 is characterized in that it is configured to prevent gas from flowing out from the inlet of the valve actuating mechanism storage chamber 30.

[Operation of the invention] In the present invention, one end side of the plunger sliding pipe 21 is connected to the plunger holder 22 and the post nut 26.
and a manual button 27, in which a plunger P that moves in the axial direction and a manual operating rod M are housed. and,
The above plunger sliding pipe 21, plunger holder 2
2. Post nut 26 and manual button 27
Since the spaces between the two are airtightly maintained by the first, second, and third gas seal members 51, 52, and 53, the plunger sliding pipe 21 can be opened from the other end of the plunger sliding pipe 21. The gas that has entered the valve operating mechanism storage chamber 30 will not leak.

Further, a solenoid mounting holder 60 is provided so as to cover the entrance of the valve operating mechanism storage chamber 30 from the outer periphery of the other end of the plunger sliding pipe 21, and the solenoid mounting holder 60 and the area around the entrance of the valve operating mechanism storage chamber 30 are connected. Since the fourth gas seal member a is provided in between, gas will not leak into the valve actuation mechanism storage chamber 30 from the entrance of the valve actuation mechanism storage chamber 30.

Since the plunger P and the manual operating rod M are not provided with a gas seal member that directly contacts them, sliding resistance due to the gas seal member does not act on the plunger P when the plunger P moves. That is, since the movement resistance of the plunger P becomes extremely small, the opening and closing of the valve nozzle 11 becomes extremely stable.

[Embodiments of the Invention] The present invention will be specifically described below using Examples with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view showing a gas cutoff valve according to an embodiment of the present invention.

In the figure, E denotes a gas cutoff valve according to an embodiment of the present invention, which includes a gas flow chamber 10 in which a gas inlet 12 and a gas outlet 13 are communicated via a valve nozzle 11;
The gas distribution chamber 10 includes a valve operating mechanism storage chamber 30 in which a valve operating mechanism 20 is disposed, which is provided opposite to the valve nozzle 11; It is composed of a valve body 40 that opens and closes.

To further explain this structure, the valve operating mechanism 20 includes a solenoid S and an upper part (one end side) of the solenoid S, as illustrated in this embodiment.
The operating mechanism T of the manual operating rod M located in
and these solenoid S and manual operation rod M
and a plunger P operated by an operating mechanism T.

The solenoid S has the plunger P inside.
The plunger holder 22 is fitted to the upper part (one end side) of the plunger sliding tube 21 into which the plunger sliding tube 21 is slidably inserted, via the gas seal member 51 (first gas sealing member), and the plunger sliding tube 21 It is constructed by arranging a permanent magnet 23 around the lower part (lower end part) and a solenoid coil 24 around the middle part.

And the upper part (one end side) of the plunger P
is formed in a convex shape as shown in the figure, and a manual operating rod M having a display section Ma on the top is attached to the upper end (one end side) of the manual operating rod M, passing through the plunger holder 22. Further, the valve body 40 is removably attached to the lower end (lower end side) of the plunger P via a valve rod 25.

Further, a solenoid mounting holder 60 is installed on the lower surface of the upper casing 31 forming the valve operating mechanism storage chamber 30 so as to cover this.
A valve pressing spring 61 is attached between the lower part of the holder 60 and the upper surface of the valve element 40.

Therefore, when a gas cutoff pulse signal is sent to the solenoid S described above, the magnetic field of the solenoid coil 24 forms a circuit opposite to the magnetic field circuit of the permanent magnet 23,
As a result, the attraction force of the permanent magnet 23 decreases, and the plunger P to which the valve body 40 is attached is lowered by the pressing force of the valve body pressing spring 61, and the valve body 40
is brought into pressure contact with the valve nozzle 11 to block gas flow.

Furthermore, when a gas flow pulse signal is sent to the solenoid S, the magnetic field of the solenoid coil 24 forms a magnetic field circuit in the same direction as the magnetic field circuit of the permanent magnet 23, and as a result, the attraction force of the solenoid S increases and the plunger P rises against the pressing force of the valve element pressing spring 61, and the valve element 40 pushes against the valve nozzle 11.
can be opened to allow gas to flow through.

Next, the operating mechanism T of the manual operating rod M attached to the upper end of the plunger P as described above will be explained.

In this embodiment, the operating mechanism T of the manual operating rod M is connected to the solenoid S as shown in FIG.
A post nut 26 is screwed to the upper part (one end side) of the plunger holder 22 via a gas seal member 52 (second gas seal member), and a gas seal member 53 is screwed to the upper part (one end side) of the post nut 26.
A manual button 27 that is loosely inserted so that it can be raised and lowered (movably) through a third gas seal member and closes the upper part of the post nut 26, and a spring 28 that provides a return function to the manual button 27.
and a spring holder 29 that accommodates the spring 28.

To further explain this structure, as shown in the figure, the manual button 27 has an internal structure that engages with the neck of the display section Ma provided at the top of the manual operating lever M when the manual operating lever M is pulled up. An engaging member 27a having a mating engaging portion A is provided, and a spring receiver 27b for receiving the spring 28 is protruded from the outside.

In addition, the above-mentioned manual button 27 is molded from transparent synthetic resin in this embodiment, and is similar to the display part Ma of the above-mentioned manual operation rod M.
is made so that it can be viewed silently from the outside.

Further, the spring 28, as shown in the figure,
It is composed of an upper spring 28a and a lower spring 28b, and the upper spring 28a is
It is installed between the flange 29a formed at the top of the spring holder 29 and the spring receiver 27b of the manual button 27, and
8b is installed between the spring receiver 27b and a flange 29b formed at the bottom of the spring holder 29.

A cap 32 is removably screwed onto the top of the upper casing 31 via a gas seal member 54. In this embodiment, this cap 32 is molded from transparent synthetic resin.
The display section Ma of the above-mentioned manual operation rod M is arranged so that it can be viewed silently from the outside.

The operating mechanism T of the manual operating rod M is configured as described above, so when shutting off the gas flow by manual operation, first remove the cap 32 from the top of the upper casing 31, and then After that, the manual button 27 is pressed to lower it, and the manual operating lever M is lowered.

Then, the upper part of the plunger P separates from the plunger holder 22, the attraction force between the plunger holder 22 and the plunger P decreases, and the plunger P with the valve body 40 attached is lowered by the pressing force of the valve body pressing spring 61. However, the valve body 40 is brought into pressure contact with the valve nozzle 11 and can block the flow of gas (see FIG. 1A).

When gas is to be circulated by manual operation, first remove the cap 32 from the top of the upper casing 31 as described above, then pull up the manual button 27 and move the plunger P to the plunger holder 22. Raise it to the adsorption area.

Then, due to the suction force of the plunger holder 22, the plunger P rises against the pressing force of the valve element pressing spring 61, and the valve element 40 is moved toward the valve nozzle 11.
can be opened to allow gas to flow (first
(See Figure B).

In addition, in the figure, 62 is a Y-shaped gasket, which is attached to the plunger P in the solenoid mounting holder 60.
It is attached around the insertion part of the plunger P and prevents dust and the like contained in the gas from entering between the plunger P and the plunger sliding tube 21.

In addition, in this embodiment, the gas sealing means for preventing gas leakage from the gas distribution chamber 10 to the valve actuation mechanism storage chamber 30 includes the upper part of the plunger sliding pipe 21 and the plunger holder 22, as described above.
A gas seal member 51 (an O-ring in this embodiment) provided between the plunger holder 2 and the plunger holder 2
2 and the post nut 26 (an O-ring in this embodiment).
And this post nut 26 and manual button 2
7 and a gas seal member 53 (in this embodiment, an O-ring).

In this way, in the present invention, each gas seal member is not provided on the sliding portion of the plunger P at all.

[Effects of the Invention] As described above, the present invention does not include any gas seal member that directly contacts the manual operation rod and the plunger to maintain airtightness. Therefore,
It has the following effects. That is, (1) When the plunger is operated by a solenoid, the plunger does not become an air damper, unlike when a diaphragm is provided in the plunger, for example. Therefore, the operating performance of the solenoid can be greatly improved.

As a result, the solenoid can be downsized, the gas cutoff valve can be downsized, and costs can be reduced.

(2) Also, the gas seal member does not come into direct contact with gas. Therefore, even if the gas seal member undergoes a change in hardness due to a decrease in gas temperature, the operating resistance of the plunger does not increase, so the valve nozzle can be stably opened and closed using a small solenoid.

As a result, it is possible to reduce costs by downsizing the solenoid.

(3) Furthermore, since the gas seal member is not deformed by movement of the plunger or manual operation rod, the durability of the gas cutoff valve can be improved.

[Brief explanation of drawings]

FIG. 1 shows a gas cutoff valve according to an embodiment of the present invention, A is a cross-sectional view showing the closed state and B is a cross-sectional view showing the open state, and FIGS. 2 and 3 are cross-sectional views showing a conventional gas cutoff valve. It is an explanatory view with a part cut away. 10... Gas distribution chamber, 11... Valve nozzle, 12
...Gas inlet, 13...Gas outlet, 20...
Valve operating mechanism, 21...Plunger sliding pipe, 22...
... Plunger holder, 26 ... Post nut, 2
7... Manual button, 30... Valve actuation mechanism storage chamber, 40... Valve body, 51... Gas seal member (first gas seal member), 52... Gas seal member (second gas seal member) , 53...Gas seal member (third gas seal member), 60...Solenoid mounting holder, a...Gas seal member (fourth gas seal member)
(gas seal member), S... solenoid, M...
Manual operating rod, T... Manual operating rod operating mechanism, P... Plunger.

Claims (1)

[Scope of Claims] 1. A gas distribution chamber 10 in which a gas inlet 12 and a gas outlet 13 are communicated via a valve nozzle 11, and a gas distribution chamber 10 provided opposite to the valve nozzle 11 of this gas distribution chamber 10. A valve actuation mechanism storage chamber 30 in which the valve actuation mechanism 20 is arranged, and a valve body 40 that is actuated by the valve actuation mechanism 20 to open and close the valve nozzle 11.
The valve actuation mechanism 20 includes a solenoid S, a manual operation rod M arranged to extend from one end side of the solenoid S, and a manual operation rod M disposed within the solenoid S that is connected to the solenoid S and the manual operation lever M. A gas cutoff valve that is driven by a rod M and has a plunger P that drives the valve body 40 located on the other end side of the solenoid S, comprising: a cylindrical plunger that guides the plunger P into the solenoid S; A sliding pipe 21 is provided, and the plunger P is attached to one end of the plunger sliding pipe 21.
A plunger holder 22 is provided for sucking the air, a post nut 26 is provided at one end of the plunger holder 22 so as to surround the manual operating rod M, and one end of the post nut 26 is closed with the manual operating rod M accommodated therein. A manual button 27 is movably provided on the post nut 26, and a solenoid mounting holder 60 is provided so as to cover the entrance of the valve operating mechanism storage chamber 30 from the outer periphery of the other end of the plunger sliding pipe 21. , A first gas seal member 51 is provided between the plunger sliding pipe 21 and the plunger holder 22 to maintain a gap airtight between them, and a first gas seal member 51 is provided between the plunger holder 22 and the post nut 26. A second gas seal member 52 is provided to airtightly maintain a gap between the post nut 26 and the manual button 27, and a third gas seal member 53 is provided between the post nut 26 and the manual button 27 to airtightly maintain a gap therebetween.
A fourth gas seal member a is provided between the solenoid mounting holder 60 and the inlet peripheral portion 12 of the valve operating mechanism storage chamber 30 to airtightly maintain a gap therebetween, and the plunger sliding pipe The gas flowing into the plunger sliding pipe 21 from the other end side of the plunger 21 is prevented from flowing out into the valve operating mechanism storage chamber 30, and the valve operating mechanism storage chamber 30 is
A gas cutoff valve characterized in that it is configured to prevent gas from flowing out from the inlet of the valve operating mechanism storage chamber 30.