JPH0715419B2 - Gas shutoff valve - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement of a gas cutoff valve, and more particularly, to easily and appropriately change the pressure-sensitive performance at an installation work site according to the type of gas used. The present invention relates to a gas cutoff valve equipped with a gas pressure detection mechanism.

[Conventional technology]

In the gas cutoff valve, a gas pressure detection mechanism having a pressure detection unit using a diaphragm needs to set its pressure sensitive performance according to the type of gas used.

However, in the conventional gas pressure detection mechanism of this type, as shown in FIG. 6, the detection pressure of the pressure detection diaphragm D cannot be changed unless the spring 82 is replaced with one corresponding to the type of gas, or It had a structure in which the spring force was adjusted with screws or the like. Therefore, there are the following problems. That is, (1) it is necessary to produce various types of gas pressure detection mechanisms corresponding to each type of gas used and keep them in stock. Therefore, while the production line, quality control, inventory control, etc. become complicated, the inventory amount increases and the cost increases.
It is necessary to bring various types of gas pressure detection mechanism to the installation site.

(2) Therefore, in order to solve the above-mentioned problems, prepare various types of springs, bring them to the construction site and exchange them according to the type of gas, or adjust the spring force at the construction site. However, the adjustment is difficult and requires a high level of skill and skill as well as the precise adjustment is not possible.

[Object of the Invention]

The present invention has been studied to solve the above problems,
It has been achieved.

Therefore, an object of the present invention is to make it possible to easily and accurately change the pressure-sensitive performance at the installation site by adapting the detection pressure changing structure of the pressure detection diaphragm to correspond to the type of gas used. There is provided a gas cutoff valve having the above gas pressure detection mechanism. Especially.

[Structure of Invention]

That is, the present invention is a gas cutoff valve including a gas cutoff mechanism configured to open and close a valve nozzle by a valve element operated by a plunger actuation mechanism, and a gas pressure detection mechanism provided in the gas cutoff mechanism. The gas pressure detection mechanism is a gas flow chamber in which a gas flow inlet and a gas flow outlet communicate with each other via a valve nozzle, and a pressure detection chamber in which the pressure detection mechanism is provided in communication with the gas flow chamber. And a pressure detection diaphragm provided in the pressure detection chamber, the pressure detection mechanism being interlocked with the pressure in the gas flow chamber,
A cylinder provided on the side opposite to the flow chamber of this pressure detection diaphragm and provided with a plurality of elastic body receiving members projecting at intervals in the axial direction, and one side slidably inserted into the diaphragm side of this cylinder. An abutting body having the other side attached to the diaphragm, an elastic body independently interposed between the abutting body and each elastic body receiving member, and each elastic body is selected to be the pressure detecting diaphragm. A gist of the gas cutoff valve is constituted by a pressing force selecting means for applying a predetermined pressing force via the abutment body.

Example of Invention

Hereinafter, the present invention will be specifically described by way of examples with reference to the drawings.

1 to 5 show a gas cutoff valve according to an embodiment of the present invention, and FIG. 1 shows a main part, that is, a pressure detection chamber constituting a gas pressure detection mechanism and a pressure detection mechanism arranged inside this. FIG. 2 is a side view explanatory view showing a process of changing the detection pressure of the pressure detection diaphragm D, and FIG. 3 is a partially cutaway front view showing a main part in a valve closed state. FIG. 4 is a front view explanatory view in which a part of a main part in a valve opened state is cut away, and FIG. 5 is a part showing a plunger operating mechanism and an operating mechanism of a manually operated rod which constitute a gas shutoff mechanism. It is a front view explanatory view which notched.

In the figure, S is a gas cutoff valve according to an embodiment of the present invention,
It is composed of a gas cutoff mechanism G configured to open and close the valve nozzle 11 by a valve element 40 operated by the plunger actuation mechanism 20, and a gas pressure detection mechanism E provided in the gas cutoff mechanism G.

The gas pressure detection mechanism E includes a gas flow chamber 10 in which a gas inlet 12 and a gas outlet 13 are communicated with each other via a valve nozzle 11.
And a pressure detection chamber 70 provided in communication with the gas flow chamber 10 and having a pressure detection mechanism 80 arranged therein.

The pressure detection mechanism 80 includes a pressure detection diaphragm D provided in the pressure detection chamber 70, which operates in conjunction with the pressure in the gas distribution chamber 10, and an axial direction provided on the side opposite to the pressure detection diaphragm D of the pressure detection diaphragm D. Plural elastic body receiving members at intervals
A cylindrical body 83 provided with a protruding portion 81, an abutting body 84 in which one side is slidably inserted into the diaphragm D side of the cylindrical body 83 and the other side is attached to the diaphragm D, and the abutting body 84 and each of the above-mentioned An elastic body 82 independently interposed between the elastic body receiving member 81,
The elastic body 82 is selected to select the pressure detecting diaphragm D.
And a pressing force selecting means 85 for applying a predetermined pressing force via the contact body 84.

This structure will be further described. In this embodiment, the pressure detection chamber 70, which is one of the constituent elements of the gas pressure detection mechanism E, is used.
As shown in FIG. 1, is provided on one side of the gas distribution chamber 10 via a side wall 71, and is communicated with the inside of the gas distribution chamber 10 by a communication hole 72 provided in the side wall 71. .

The pressure detection diaphragm D is removably attached to the communication hole 72 side in the pressure detection chamber 70, and one of the constituent elements of the gas pressure detection mechanism E described above is attached to the back side of the pressure detection diaphragm D. A pressure detection mechanism 80, which is one of them, is arranged.

The pressure detection mechanism 80 is the first in the present embodiment.
As shown in the drawing, a cylinder 83 having a plurality of elastic body receiving members 81 projecting from the pressure detection chamber 70 by means of an appropriate means and axially spaced from each other, and the diaphragm of the cylinder 83. An abutting body 84 for slidably inserting to the D side to the diaphragm D, and the elastic body 82 (the book) which is independently interposed between the abutting body 84 and each elastic body receiving member 81. In the embodiment, since springs are used, they will be referred to as springs hereinafter.), And each of the springs 82 is selected to select a pressing force for applying a predetermined pressing force to the pressure detection diaphragm D via the abutment body 84. And means 85.

Further explaining this structure, the elastic body receiving member 81,
As shown in the present embodiment, two first elastic body receiving members 81a provided on the diaphragm D side and a second elastic body receiving member 81b provided at a distance behind the first elastic body receiving member 81a are arranged. The first spring 82a is independently interposed between the elastic body receiving member 81a and the contact body 84, and the second spring 82b is independently interposed between the second elastic body receiving member 81b and the contact body 84. is there.

The number of the elastic body receiving member 81 and the number of the spring 82 described above are two in each of the present embodiment, but it is needless to say that the number may be appropriately increased if necessary.

The pressing force selecting means 85 for selecting each of the first spring 82a and the second spring 82b and applying a predetermined pressing force to the pressure detecting diaphragm D via the contact body 84 is the first pressing force selecting means 85 in this embodiment. As shown in FIGS. 2 and 2, a plurality of screws 86 are attached to the inner wall of the pressure detection chamber 70 so as to correspond to the second elastic body receiving member 81b.

Therefore, when it is desired to apply the pressing force of only the first spring 82a to the pressure detection diaphragm D, the second spring 82b can be suppressed by the pressing force selecting means 85, as shown by the solid line in FIGS. 1 and 2. The pressing force of the second spring 82b may be prevented from acting on the diaphragm D by setting the pressing force selection means 85.

Further, when the pressing force of the first spring 82a and the pressing force of the second spring 82b are to be combined and applied to the pressure detection diaphragm D, as shown by the dotted line in FIG. The second spring restraint of the pressure selecting means 85 may be released so that the pressing force of the second spring 82b acts on the diaphragm D.

As a result, a predetermined pressing force can be applied to the pressure detection diaphragm D simply by selecting each spring as needed.

Therefore, the pressure-sensitive performance can be easily and accurately changed at the installation work site according to the type of gas used.

Next, the valve element 40, which is one of the components of the gas shutoff mechanism G, will be described with reference to FIGS. 3 and 4.

As shown in the present embodiment, the valve body 40 includes a first valve body 41 that opens and closes the valve nozzle 11 and a slave valve nozzle 42 provided in the first valve body 41, which is operated by the plunger P. It is composed of a second valve body 43 that opens and closes and operates the first valve body 41.

That is, the first valve body 41 constituting the valve body 40 is provided with a through hole 44 penetrating the upper and lower surfaces in the central portion, and the sub valve nozzle 42 is fitted in the through hole 44. is there.

Further, the second valve body is surrounded by surrounding the sub valve nozzle 42.
A second valve body mounting member 45 for mounting the 43 up and down is detachably screwed.

As shown in the figure, the second valve body mounting member 45 has an inwardly projecting step portion 45a formed in the middle portion thereof, and a gas circulation hole 46 is formed in the lower peripheral portion thereof at intervals. ing.

Further, on the lower surface of the above-mentioned first valve body 41, the valve nozzle 11
A seal member 47 made of a rubber-like spring is fitted in a position corresponding to.

Next, the second valve body 43, which is mounted in the second valve body mounting member 45 of the first valve body 41 so as to be able to move up and down, has a rubber-like spring at a position corresponding to the slave valve nozzle 42 on the lower surface. A seal member 48 consisting of is attached, and an attachment portion 49 for attaching the lower end of the plunger P is provided in the central portion of the upper portion.

Then, as shown in the drawing, the second valve body 43 is mounted in the second valve body mounting member 45 so as to be able to move up and down via a second valve body pressure reducing spring 43a.

Therefore, when the valve body 40 is opened, if the plunger P is pulled up, first, the second valve body 43 is pulled up against the pressing force of the second valve body pressure reduction spring 43a, and the slave valve nozzle 42 is opened.
Subsequently, the first valve body 41 can be pulled up to open the valve nozzle 11, and the gas can flow.

As described above, in this embodiment, the plunger P is
First, the second valve body 43 is pulled up against the pressing force of the second valve body pressure lowering spring 43a to open the slave valve nozzle 42. The gas can be caused to flow out from the gas supply side toward the low pressure downstream side, and the gas pressure on the upstream side and the gas pressure on the downstream side can be substantially balanced in advance.

Therefore, the valve body 40 can be opened with a smaller amount of energy as compared with the conventional gas pressure detection mechanism described above.

Further, in this embodiment, when the second valve body 43 is pulled up, the flange portion 43b formed on the lower peripheral edge of the second valve body 43 strikes the step portion 45a of the second valve body mounting member 45. Therefore, the valve opening operation described above can be promoted.

Next, the plunger actuating mechanism 20, which is one of the constituent elements of the gas shutoff mechanism G, will be described with reference to FIG.

As shown in this embodiment, the plunger actuating mechanism 20 includes a solenoid S, an actuating mechanism T of a manually operated rod M arranged above the solenoid S, and an actuating mechanism of the solenoid S and the manual operated rod M. Plunger P operated by T.

The solenoid S fits the plunger holder 22 through the gas seal member 51 (O ring in this embodiment) on the upper part of the plunger slide tube 21 into which the plunger P is slidably inserted. , Plunger sliding tube above
The permanent magnet 23 is arranged around the lower part of the 21, and the solenoid coil 24 is arranged around the middle part.

An upper portion of the brandier P is formed in a convex shape as shown in the figure, and a manual operation bar M having a display portion Ma at the top is attached to the upper end of the plunger P through the plunger holder 22. There is. Further, the above-mentioned valve element 40 is detachably attached to the lower end of the plunger P via a valve rod 25.

Further, a solenoid mounting holder 60 is mounted on the lower surface of the upper casing 31 forming the plunger actuating mechanism accommodating chamber 30 via a gas seal member a (O ring in this embodiment) so as to cover the lower casing 31. A first valve body pressing spring 61 is attached between the lower portion of 60 and the upper surface of the first valve body 41.

Next, the case where the plunger actuating mechanism 20 described above is operated to close the valve body 40 and the case where the valve body 40 is opened will be described.

[When closing the valve]

When a gas cut-off pulse signal is sent to the solenoid S, the magnetic field of the solenoid coil 24 forms a circuit opposite to the magnetic field circuit of the permanent magnet 23, and as a result, the attraction force of the permanent magnet 23 decreases and the valve The plunger P to which the body 40 is attached descends due to the pressing force of the valve body pressing spring 61.

Then, first, the valve body 40 is pressed against the valve nozzle 11 to close the valve nozzle 11, and at the same time, the second valve body 43 descends due to the pressing force of the second valve body lowering spring 43a. The slave valve nozzle 42 is closed to completely shut off the gas flow.

[When opening the valve]

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 circuit of the permanent magnet 23, the attracting force of the solenoid S increases, and the plunger P rises.

Then, first, the second valve body 43 is pulled up against the pressing force of the second valve body pressure reducing spring 43a, and the slave valve nozzle 42 is opened.
Subsequently, the plunger P further rises against the pressing force of the first valve body pressing spring 61, so that the first valve body 41 becomes the valve nozzle.
11 is opened and gas is circulated.

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

As shown in FIG. 1 in the present embodiment, the actuation mechanism T of the manual operation rod M includes a post nut 26 screwed onto an upper portion of the plunger holder 22 of the solenoid S via a gas seal member 52, and this post. Gas seal member for nut 26
Manual button 27 loosely inserted so that it can be raised and lowered via 53
And a spring 28 for giving a return function to the manual button 27, and a spring holder 29 for accommodating the spring 28.

To explain this structure further, the above manual button 27
As shown in the drawing, an engagement portion A is formed inside which engages with the neck portion of the display portion Ma provided on the top of the manual operation rod M when the manual operation rod M is pulled up. A member 27a is provided, and a spring receiver 27b for receiving the spring 28 is further provided on the outside.

The manual button 27 described above is molded of transparent synthetic resin in the present embodiment, so that the display portion Ma of the manual operation rod M can be viewed from the outside.

Further, the spring 28 is composed of an upper spring 28a and a lower spring 28b, as shown in the drawing.The upper spring 28a includes a collar portion 29a formed on the top of the spring holder 29 and a spring of the manual button 27. The lower spring 28b is mounted between the spring holder 27b and the collar portion 29b formed on the bottom portion of the spring holder 29.

A cap 32 is detachably screwed onto the top of the upper casing 31 via a gas seal member 54. In the present embodiment, the cap 32 is molded of transparent synthetic resin, and is the display portion of the manual operation rod M described above.
I can see Ma from the outside.

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

Then, the upper part of the plunger P is even separated from the plunger holder 22, and the attraction force between the plunger holder 22 and the plunger P is reduced, and the plunger P with the valve body 40 attached is lowered by the pressing force of the valve body pressing spring 61. Then, the valve body 40 is brought into pressure contact with the valve nozzle 11 to block the flow of gas.

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

Then, the attraction force of the plunger holder 22 raises the plunger P against the pressing force of the valve body pressing spring 61, and the valve body 40 opens the valve nozzle 11 to allow the gas to flow.

Further, in the present embodiment, the gas sealing means for preventing the leakage of gas from the gas flow chamber 10 to the plunger actuating mechanism housing chamber 30 is, as described above, the upper portion of the plunger sliding tube 21 and the plunger holder 22. A gas seal member 51 (an O ring in this embodiment) provided between the two, and a gas seal member 52 (an O ring in this embodiment) provided between the upper portion of the plunger holder 22 and the post nut 26. A gas seal member 53 (O ring in this embodiment) provided between the post nut 26 and the manual button 27.

As described above, in this embodiment, each gas seal member is not provided on the sliding portion of the plunger P at all.

Therefore, when the plunger S is operated by the solenoid S, the operating performance of the solenoid S can be greatly improved, while the gas seal members 51, 52, 53 do not come into direct contact with the gas, so that the gas seal members 51 are not directly contacted with each other. The hardness of 52, 53 does not change due to the decrease in gas temperature, and the operating resistance of the plunger P does not increase. As a result, the plunger actuating mechanism such as the solenoid can be further downsized in cooperation with the present invention described above, and the cost can be reduced.

Also, when the plunger P is operated by the manual operation rod M, the operation resistance of the plunger is small as described above, so that the manual operation can be facilitated and ensured.

〔The invention's effect〕

As described above, the gas cutoff valve according to the present invention is provided with a plurality of elastic bodies via the elastic body receiving member behind the pressure detection diaphragm provided with the pressure detection mechanism so as to interlock with the pressure in the gas flow chamber. Are arranged independently of each other, and each elastic body is selected so that a predetermined pressing force can be applied to the pressure detection diaphragm. Therefore, the pressure detection diaphragm can be selected by selecting each elastic body as necessary. A predetermined pressing force can be applied to.

Therefore, the pressure-sensitive performance can be easily and accurately changed at the installation work site according to the type of gas used.

Therefore, it is not necessary to produce many kinds of gas pressure detection functions corresponding to each kind of used gas or stock each of them, unlike the above-mentioned conventional one.

As a result, the production line, quality control, inventory control, etc. can be simplified, while the amount of inventory can be greatly reduced to reduce costs.

Moreover, since there is no grief to bring a variety of gas pressure detection mechanisms to the installation work site unlike the conventional ones, the cost of the installation work can be reduced, and the adjustment is easy and no advanced technology is required.

[Brief description of drawings]

1 to 5 show a gas cutoff valve according to an embodiment of the present invention, and FIG. 1 shows a main part, that is, a pressure detection chamber constituting a gas pressure detection mechanism and a pressure detection mechanism arranged inside this. FIG. 2 is a side view explanatory view showing a process of changing the detection pressure of the pressure detection diaphragm D, and FIG. 3 is a partially cutaway front view showing a main part in a valve closed state. FIG. 4 is a front view explanatory view in which a part of a main part in a valve opened state is cut away, and FIG. 5 is a part showing a plunger operating mechanism and an operating mechanism of a manually operated rod which constitute a gas shutoff mechanism. FIG. 6 is a front view explanatory view in which a part is cut out, and FIG. 6 is a front view explanatory view in which a part of a conventional squirrel pressure detecting mechanism is cut out. S ... Gas cutoff valve, E ... Gas pressure detection mechanism, G ... Gas cutoff mechanism, 10 ... Gas distribution chamber, 11 ... Valve nozzle, 12 ...
… Gas inlet of gas distribution chamber, 13 …… Gas outlet of gas distribution chamber, 20 …… Plunger actuating mechanism, 30 …… Plunger actuating mechanism storage chamber, 40 …… Valve body, 70 …… Pressure detection chamber, 80 ......
Pressure detection mechanism, 81 ... Elastic body receiving member, 82 ... Elastic body, 83
…… Cylinder, 84 …… Abutting body, 85 …… Pressing force selection means, D…
... diaphragm.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenya Nakamura 23 Minamikashima, Futamachi-cho, Tenryu-shi, Shizuoka Prefecture (72) Inventor Chihiro Oketani 23 Minamikashima, Futamachi-cho, Tenryu-shi, Shizuoka Prefecture (56) References JP, U) Actual development Sho 54-86070 (JP, U)

Claims (1)

[Claims] 1. A gas cutoff valve comprising a gas cutoff mechanism configured to open and close a valve nozzle by a valve element operated by a plunger actuation mechanism, and a gas pressure detection mechanism provided in the gas cutoff mechanism. The gas pressure detection mechanism is a gas flow chamber communicating with a gas flow inlet and a gas flow outlet via a valve nozzle, and a pressure detection chamber provided with the pressure detection mechanism in communication with the gas flow chamber. The pressure detection mechanism is provided in the pressure detection chamber and is interlocked with the pressure in the gas flow chamber, and a plurality of pressure detection diaphragms are provided on the side opposite to the flow detection chamber of the pressure detection diaphragm and spaced apart in the axial direction. A cylindrical body provided with projecting elastic body receiving members, and an abutting body in which one side is slidably inserted into the diaphragm side of the cylindrical body and the other side is attached to the diaphragm,
An elastic body independently interposed between the abutting body and the elastic body receiving member, and each elastic body is selected to apply a predetermined pressing force to the pressure detection diaphragm via the abutting body. A gas cutoff valve comprising a pressing force selection means to be applied.