JP2000310397A - Valve device for gas cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a valve device on which a safety valve is attached compact. SOLUTION: An inlet passage 8, a closing valve chamber 25 and a gas outlet 5 are sequentially provided in a housing 3. A first check valve 11 to avoid a flow from the inlet passage 8 to the closing valve chamber 25 is provided in a gas filling passage 10 arranged in parallel with the closing valve chamber 25, and the flow to the closing valve chamber 25 and the first check valve 11 is avoided by a second check valve 12. A sleeve 31 is internally fitted in a recessed part 30 to open on an outer surface of the housing 3, a first check valve chamber 34 of the first check valve 11 is constituted of an inner space of the sleeve 31, and the first check valve chamber 34 is communicated to the outside of the housing 3 through a gas discharge passage 14. A rupture disc 16 provided in the gas discharge passage 14 is airtightly pressurized in the housing 3 by screw thrust of a cover member 32, and the sleeve 31 is pressurized and fixed in the housing 3 through the rupture disc 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device which is mounted on a gas cylinder containing compressed gas or liquefied gas and used for taking out and filling gas.

[0002]

2. Description of the Related Art This type of gas cylinder valve device includes:
Conventionally, Japanese Patent Application Laid-Open No. 8-1593 proposed by the present applicant has been proposed.
No. 97 is described. In the conventional valve device, a gas inlet, a shutoff valve, and a gas outlet are sequentially arranged in a housing, and a first check valve is provided in parallel with the shutoff valve. Is blocked by a second check valve, and a gas discharge passage is branched from an inlet passage between the gas inlet and the shut-off valve so as to be outside the gas discharge passage. A safety valve is attached to the end.

[0003]

In the above prior art,
Since the boss portion for mounting the safety valve in addition to the two boss portions for mounting the respective check valves protrudes outside the housing, there is a problem that the valve device becomes large. An object of the present invention is to make a valve device provided with a safety valve compact.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, as shown in FIGS. 1 to 3, a valve device for a gas cylinder is constituted as follows.
A shut-off valve 7 is provided in the housing 3 between the gas inlet 4 and the gas outlet 5, and a gas filling path 10 for connecting the gas outlet 5 to the internal space A of the gas cylinder 1 is arranged in parallel with the shut-off valve 7. And a first check valve 11 for preventing a flow from the internal space A of the gas cylinder 1 to the gas outlet 5 is provided in the gas filling path 10, and the shut-off valve is provided from the gas outlet 5. In the gas cylinder valve device configured so that the flow to the first check valve 7 and the first check valve 11 can be blocked by the second check valve 12, the first check member 36 of the first check valve 11 is housed. The first check valve chamber 34 communicates with the internal space A of the gas cylinder 1 through the gas filling path 10 and communicates with the outside of the housing 3 through the gas discharging path 14, and the gas discharging path 14 Sealed with a rupture disk 16 It is.

[0005] The invention of claim 1 has the following effects. When the gas in the internal space of the gas cylinder 1 abnormally rises in pressure for some reason, the abnormal pressure is applied to the rupturable plate 16 via the gas filling path 10 and the first check valve chamber 34 of the first check valve 11. Acts to rupture the rupturable plate 16, whereby the gas at the abnormal pressure is released from the gas discharge passage 1.
4 and is discharged to the outside of the housing 3. And
ADVANTAGE OF THE INVENTION According to this invention, when providing a safety valve in the valve apparatus for gas cylinders, it becomes possible to attach a gas discharge path and a rupturable plate of the safety valve to the mounting space of the first check valve, and it is possible to use a dedicated valve for mounting the safety valve. Since there is no need to provide a boss portion, the valve device can be made compact.

Further, as shown in the second aspect of the present invention, in the first aspect of the present invention, the following configuration is preferable. That is, the first check valve chamber 34 and the rupturable plate mounting chamber 17 of the gas discharge passage 14 are arranged in series and linearly, and the rupturable plate 16 mounted in the rupturable plate mounting chamber 17 is provided. The peripheral portion is pressed against the housing 3 in an airtight manner by the screw thrust of the lid member 32. According to the second aspect of the present invention, the first check valve and the rupturable plate can be mounted on the housing with one lid member. Therefore, the valve device can be made more compact by reducing the number of parts.

Further, as described in the third aspect of the present invention, in the second aspect of the present invention, the following configuration is preferable. That is, the sleeve 31 is fitted in the recess 30 opened on the outer surface of the housing 3,
And the first check valve chamber 34 communicates with the rupturable plate mounting chamber 17 through an outlet hole 31a in the outer end wall of the sleeve 31. Then, a first check spring 37 is attached between the peripheral wall of the outlet hole 31a and the first check member 36, and the rupturable plate 16 and the gasket 18 are moved by the screw thrust of the cover member 32. The sleeve 31 is pressed and fixed to the housing 3 via the. According to the third aspect of the present invention, since the sleeve separate from the housing can be precisely machined, the first sleeve inserted into the precisely machined sleeve can be used.
The check member operates smoothly.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
3 will be described with reference to FIG. FIG. 1 is a system diagram of a gas cylinder valve device. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view of the valve device as viewed from an elevation. First, the schematic configuration of the valve device will be described with reference to the system diagram of FIG.

A valve device 2 fixed to a gas cylinder 1
Has a gas inlet 4 and a gas outlet 5 on the outer surface of the housing 3. A shut-off valve 7 is provided in a gas outlet path 6 from the gas inlet 4 to the gas outlet 5. The gas outlet path 6 is constituted by an inlet path 8 and an outlet path 9. The gas outlet 5 is connected to the internal space A of the gas cylinder 1.
A gas filling passage 10 communicating with the shut-off valve 7 is provided in parallel with the shut-off valve 7. The gas filling path 10 is provided with a first check valve 11 for preventing a flow from the internal space A of the gas cylinder 1 to the gas outlet 5. Further, a second check valve 12 for maintaining residual pressure is provided in the outlet path 9. The second check valve 12 functions to prevent a flow from the gas outlet 5 to the shut-off valve 7 and the first check valve 11. Further, the gas discharge passage 14 is led out of the first check valve chamber 34 (see FIG. 2 or FIG. 3) of the first check valve 11, and the gas discharge passage 14 is provided with the primary safety valve 15.

The above-mentioned valve device 2 is used as follows. At the time of gas removal, by opening the closing valve 7,
The high-pressure gas in the gas cylinder 1 is supplied to the shut-off valve 7 and the second check valve 12.
And is taken out from the gas outlet 5 in order. During the gas removal, if the backflow gas enters the gas outlet 5 for any reason, the second check valve 12
Prevents the backflow, so that the inside of the gas cylinder 1 can be prevented from being contaminated by the backflow gas. When the removal of gas proceeds and the residual pressure of the gas cylinder 1 decreases to a set value, the second check valve 12 is automatically closed by the second check spring 42 (see FIG. 2). This prevents the gas from being taken out further and keeps the residual pressure of the gas cylinder 1 at the set pressure. As a result, even if the stop valve 7 is accidentally left open, it is possible to prevent the atmosphere from entering the empty gas cylinder 1.

When filling the empty gas cylinder 1 with a new high-pressure gas, the closing valve 7 is kept closed,
A gas filling fitting (not shown) is connected to the gas outlet 5. Then, the above-mentioned second check valve 12 is opened by the manual operation of the forced valve opening means provided on the gas filling fitting. Next, a high-pressure filling gas is supplied from the gas filling fitting. Then, the filling gas passes through the second check valve 12 and the first check valve 11 in order from the gas outlet 5, and is filled into the internal space A of the gas cylinder 1 from the gas inlet 4.

The specific structure of the valve device 2 will be described with reference to FIGS. 2 and 3 while referring to FIG. The leg screw 21 of the housing 3 of the valve device 2 is screwed and fixed to the neck 1 a of the gas cylinder 1. The gas inlet 4 is opened on the lower surface of the leg screw portion 21. An intermediate height portion of the housing 3 is swelled leftward, and the outlet path 9 is provided in the swelling portion 3a. An outlet nozzle 22 is provided on the peripheral wall of the end portion of the outlet passage 9, and the gas outlet 5 is opened at an end face of the outlet nozzle 22. In the housing 3, the gas inlet 4 communicates with the gas outlet 5 through the inlet passage 8, the closing valve seat 24, the closing valve chamber 25, and the outlet passage 9 in this order. A closing member 26 is inserted into the closing valve chamber 25 so as to be able to move up and down, and the closing member 26 is opened and closed by the spindle 27 and the handle 28 on the closing valve seat 24.

From the peripheral wall of the closing valve chamber 25, the boss portion 2
The first check valve 11 is mounted on a boss portion 29 of the first check valve 11. That is, the above boss portion 29
The first check valve seat 3 communicated with the shut-off valve chamber 25
3 and a recess 30 opening in the outer surface of the housing 3 are formed. The first check valve chamber 34 is constituted by the internal space of the sleeve 31 fitted in the recess 30. The first check valve chamber 34 communicates with the inlet passage 8 via the communication hole 35. The first check member 36 inserted in the first check valve chamber 34 is brought into close contact with the first check valve seat 33 by the first check spring 37.

When the gas is filled, the first check member 36 is pressed against the first check spring 37 by the pressure of the filling gas flowing into the closing valve chamber 25 from the gas outlet 5. The filling gas is separated from the check valve seat 33 and supplied to the internal space A of the gas cylinder 1 through the inlet passage 8. That is, the gas filling path 10 here is constituted by the outlet path 9, the shutoff valve chamber 25, a part of the recess 30, and the inlet path 8.

Further, the first check valve chamber 34 communicates with the outside of the housing 3 through the gas discharge passage 14, and the gas discharge passage 14 is connected to the rupturable plate 1 of the safety valve 15.
6 sealed. More specifically, the first check valve chamber 34 and the outlet hole 31 provided in the outer end wall of the sleeve 31 are described.
a and a rupturable plate mounting chamber 17 provided in the gas discharge passage 14 are arranged in series and linearly. The right end of the first check spring 37 is received on the peripheral wall of the outlet hole 31a. Then, the peripheral edge of the rupturable plate 16 mounted in the rupturable plate mounting chamber 17 is hermetically sealed to the right end face of the boss portion 29 via the gasket 18 by the screw thrust of the lid member 32 screwed into the boss portion 29. The sleeve 31 is pressed and fixed to the peripheral wall of the recess 30 via the rupturable plate 16 and the gasket 18.

If the gas in the internal space of the gas cylinder 1 abnormally rises above the set pressure for some reason, the abnormal pressure is applied to the inlet passage 8 and the first check member 36. Communication hole 35 and first check valve chamber 3
4 and the outlet hole 31a of the sleeve 31 in order to act on the rupturable plate 16 to rupture the rupturable plate 16. Thereby, the gas of the abnormal pressure is supplied to the cover member 3.
It is discharged to the outside of the housing 3 through the second discharge hole 19. The rupturable plate 16 may be backed up by a fusible plug provided in the gas discharge passage 14.

The second check valve 12 is mounted at an intermediate portion of the outlet passage 9. That is, the bulging portion 3a
A second check member 41 is fixedly inserted into the second check valve chamber 40 in the other cover member 39. The second check valve chamber 40 communicates with the gas outlet 5 through the through hole 41 a of the second check member 41, and the close valve chamber 25 communicates with the second check valve inlet passage 45 through the communication hole 44. Is communicated to

When the pressure in the internal space A of the gas cylinder 1 exceeds the set value, when the above-mentioned closing valve 7 is opened,
Through the above-mentioned closing valve chamber 25, the above-mentioned second check valve inlet passage 4
The second check member 41 is opened against the second check spring 42 by the pressure of the gas which has flowed into 5, and when the pressure in the internal space A decreases to the above set value, The second check member 41 is automatically closed by the second check spring 42. Further, when the backflow gas enters the gas outlet 5 from the outside, the backflow gas flows into the second check valve chamber 40 through the through hole 41a of the second check member 41. The second check member 41 is strongly pressed against the second check valve seat 43 by the pressure of the inflow gas and the second check spring 42. As a result, the backflow gas does not enter the gas cylinder 1. When a new gas is charged into the gas cylinder 1 whose pressure has decreased to the above-mentioned set value, the above-mentioned fourth valve opening means 47 of the forcible valve opening means provided on the above-mentioned gas filling fitting (not shown) is used. (2) The check member 41 may be forcibly opened.

The above embodiment can be modified as follows. The gas filling path 10 only needs to connect the gas outlet 5 to the internal space A of the gas cylinder 1. Therefore, the gas filling passage 10 is provided with a dedicated passage different from the inlet passage 8 instead of the one using the inlet passage 8, and the dedicated passage is opened on the lower surface of the leg screw portion 21. You may. In this case, the first check valve chamber 34
Also, the internal space A of the gas cylinder 1 can be
Will be communicated to

The sleeve 31 of the first check valve 11 is
Instead of simply fitting into the peripheral wall of the concave portion 30 of the boss portion 29, it is preferable to air-tightly fit into the right half of the peripheral wall of the concave portion 30 with a sealing tool such as an O-ring. In this case, the gasket 18 does not need to seal between the peripheral wall of the recess 30 and the sleeve 31, and seals between the right end surface of the sleeve 31 and the rupturable plate 16. Just do it. Therefore, the gasket 18
In addition, the outer diameter of the rupturable plate 16 can be reduced. In addition, since the rupturable plate 16 and the sleeve 31 can be individually sealed with different seals, airtightness can be more reliably maintained. The second check valve 12 only needs to have a check function in a gas extracting state.
Instead of the exemplary structure in which the second check member is forcibly opened by being pressed by the valve opening device 47, the second check member may be forcibly opened by the pressure of the filling gas. .

The sleeve 31 is provided on the peripheral wall of the recess 30.
And the detachable sleeve 3
1, the first check valve seat 33 and the first check valve chamber 3
4 can also be formed. Further, the sleeve 31 may be omitted, and the first check member 36 may be inserted directly into the peripheral wall of the recess 30. The means for opening and closing the closing valve 7 may be one provided with an actuator such as an air cylinder or an electric motor, instead of the means for manually operating the handle 28. The above-mentioned closing valve 7 may be constituted by a metal diaphragm type or a ball valve instead of the seat valve type.

[Brief description of the drawings]

FIG. 1 is a system diagram of a gas cylinder valve device of the present invention.

FIG. 2 is a cross-sectional view of the valve device in plan view, and is a cross-sectional view taken along line II-II in FIG.

FIG. 3 is an elevational sectional view of the valve device.

[Explanation of symbols]

1 ... Gas cylinder, 3 ... Housing, 4 ... Gas inlet, 5 ...
Gas outlet, 7: shut-off valve, 10: gas filling path, 11: first
Check valve, 12: second check valve, 14: gas discharge path, 16:
Rupture plate, 17: Rupture disk mounting chamber, 18: Gasket, 30
... recess, 31 ... sleeve, 31a ... outlet hole, 32 ... lid member, 34 ... first check valve chamber, 36 ... first check member, 37 ...
First check spring, A: Internal space of gas cylinder 1.

Claims (3)

[Claims] 1. A shut-off valve (7) is provided in a housing (3) between a gas inlet (4) and a gas outlet (5), and said gas outlet (5) is provided.
A gas filling passage (10) for communicating the gas to the internal space (A) of the gas cylinder (1) is arranged in parallel with the shut-off valve (7),
The gas filling path (10) is provided with a first check valve (11) for preventing a flow from the internal space (A) of the gas cylinder (1) to the gas outlet (5). In the valve device for a gas cylinder, the flow from (5) to the shut-off valve (7) and the first check valve (11) can be blocked by a second check valve (12). The first check valve chamber (34) in which the first check member (36) of the check valve (11) is housed is connected to the internal space (A) of the gas cylinder (1) through the gas filling path (10). And a gas discharge passage (14), which is communicated to the outside of the housing (3) through a gas discharge passage (14), and the gas discharge passage (14) is sealed with a rupturable plate (16). apparatus. 2. The valve device for a gas cylinder according to claim 1, wherein the first check valve chamber (34) and the rupturable plate mounting chamber (17) of the gas discharge passage (14) are arranged in series and linearly. The peripheral portion of the rupturable plate (16) mounted in the rupture plate mounting chamber (17) is pressed against the housing (3) in a gas-tight manner by screw thrust of a lid member (32). A gas cylinder valve device. 3. The valve device for a gas cylinder according to claim 2, wherein a sleeve (31) is fitted inside a recess (30) opened on an outer surface of the housing (3), and the inner space of the sleeve (31) is used to form the sleeve (31). And the first check valve chamber (34) is connected to the rupturable plate mounting chamber through an outlet hole (31a) in the outer end wall of the sleeve (31). (17), a first check spring (37) is mounted between the peripheral wall of the outlet hole (31a) and the first check member (36), and the cover member (32) The rupture plate (16) by the screw thrust of
The valve device for a gas cylinder, wherein the sleeve (31) is pressed and fixed to the housing (3) via a gasket (18).