JP3120316B2 - Valve unit for gas cylinder - Google Patents

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 attached to a gas cylinder containing compressed gas or liquefied gas and used for taking out and filling gas.

[0002]

2. Description of the Related Art Generally, a valve device for a gas cylinder of this kind is provided with a valve box 103 as shown in FIG.
A shut-off valve 107 is provided between the gas inlet 104 and the gas outlet 105 in the inside. In the valve device of the first conventional example, the operation of filling the empty gas cylinder 101 with new high-pressure gas is performed in the following procedure. First, the gas outlet 10
The gas filling fitting 117 is connected to 5, and the handle wheel of the above-mentioned closing valve 107 is turned to the loose side to open the closing valve 107, and then the gas is filled into the gas cylinder 101. After the gas filling is completed, the handle is rotated to the tightening side to close the closing valve 107.

In the first conventional example, when gas is charged,
Since it is necessary to rotate the handle wheel twice between the loosening side and the tightening side, there is a problem that the rotating operation is troublesome and the efficiency of the gas filling operation is low.

In order to solve the above-mentioned problems, the present inventors have proposed a technique disclosed in Japanese Utility Model Publication No. 49-43951 (hereinafter referred to as a second conventional example) proposed by the present applicant and a technique disclosed in Japanese Patent Application Laid-Open No. HEI 5-49125.
The technology described in Japanese Patent Application Laid-Open No. 215299 (hereinafter, referred to as a third conventional example) was considered first.

[0005] In the second conventional example, as shown in FIG. 18 (b), at a location different from the gas outlet 105 on the outer surface of the valve box 103,
A gas filling port 113 communicating with the gas inlet 104 is provided, and a plug 119 of a quick joint 116 with a two-way check valve is screwed and fixed to the gas filling port 113, and a socket 120 of the quick joint 116 is connected to the tip of the gas filling fitting. It is fixed to the part. When the socket 120 of the fitting is connected to the plug 119 of the valve device 102 at the time of gas filling, the socket 120 and the plug 11
The two non-return members 111 and 112 built into the valve 9 are brought into contact with each other to open the valve.

In the third conventional example, as shown in FIG. 18C, a gas filling path 210 is branched from an inlet path 208 in a valve box 203, and the gas filling path 210 A check valve 211 for preventing gas flow to the gas charging connection port 213 is provided.

[0007]

The second conventional example shown in FIG. 18B does not require opening / closing the handlebar of the shut-off valve 107 at the time of gas filling operation, which facilitates the operation. Excellent, but with the following problems:

Since the plug 119 projects greatly from the outer surface of the valve box 103 and the valve device 102 is enlarged, the valve device 1
02 cannot be covered with the existing protective cap. Also,
Since the quick coupling 116 has a structure in which the two non-return members 111 and 112 are opened by connecting the socket 120 to the plug 119, the socket 120 is plugged after the gas cylinder 101 is filled with gas. When separating from the gas cylinder 119, the separation operation is performed while the pressure of the filling gas in the gas cylinder 101 is still applied. For this reason, a large force is required for the separation operation of the quick joint 116, and the operation becomes very difficult, and the efficiency of the gas filling operation is reduced.

Further, the gas filling fitting cannot use the existing gas filling fitting 117 shown in the first conventional example of FIG.
It is necessary to newly prepare a dedicated gas-filling fitting provided with the socket 120. Then, at a gas filling station, a gas cylinder provided with the above-described valve device of the first conventional example is connected to a second gas cylinder.
When two types of gas cylinders are mixed with the gas cylinder provided with the valve device of the conventional example, the gas filling fittings to be connected are different, so it is necessary to divide these gas cylinders for each valve device. The efficiency of the gas filling operation is further reduced by the time required for the sorting.

In the third conventional example shown in FIG. 18 (c), as in the second conventional example, there is no need to open and close the handle wheel of the shut-off valve 207 during the gas filling operation, so that the operation is easy. become. Further, at the time when the gas filling operation to the gas cylinder 201 is completed, the check valve 211 is automatically closed by the check spring to prevent the reverse flow from the gas cylinder 201 to the gas filling connection port 213, so that the gas filling is performed. The metal fitting can be removed in a depressurized state. For this reason, the metal fitting can be removed with a light force, and the gas filling operation is further facilitated.

However, the third conventional example has the following problems. In order to provide the gas charging connection port 213, it is necessary to project a gas charging nozzle from the valve box 203, so that the valve box 203 must be large. Also,
In the case where the existing gas filling fitting 117 shown in FIG. 18A can be connected to the gas filling connection port 213, the protrusion length of the nozzle corresponds to the screw size of the connection portion or the like. As the size increases, the outer diameter of the valve box 203 further increases. Therefore, the valve device 202 cannot be covered by the existing protective cap.

An object of the present invention is to provide a valve device which can perform gas filling work efficiently and can be made compact.

[0013]

Means for Solving the Problems To achieve the above object,
For example, the invention of claim 1 is applied to each of FIGS. 1 and 2, FIGS. 3 to 6, or FIGS. 7 and 8, FIGS. 9 and 10, or FIGS. 11 to 17. As shown respectively, the valve device is configured as follows.

In a valve device for a gas cylinder provided with a shut-off valve 7 in a valve box 3 between a gas inlet 4 and a gas outlet 5, a gas filling path for connecting the gas outlet 5 to an internal space A of the gas cylinder 1. 10 is provided in parallel with the shut-off valve 7, and a 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. Gas filling fittings 17 at gas outlet 5
Was configured to be attachable. The invention of claim 1 above is
For example, as shown in FIGS. 1 and 2 (or FIGS. 7 and 8, or FIGS. 9 and 10), the following operation is performed. When the gas is taken out, the high-pressure gas in the gas cylinder 1 is passed through the shut-off valve 7 by operating the shut-off valve 7 to the open side.
Taken out of When filling the empty gas cylinder 1 with a new high-pressure gas, a gas filling fitting 17 is connected to the gas outlet 5 with the closing valve 7 closed, and a high-pressure filling gas is supplied from the fitting 17. I do. Then, the filling gas is filled into the internal space A of the gas cylinder 1 from the gas outlet 5 through the check valve 11 and the gas inlet 4 in order.
When the gas filling operation is completed, the check valve 11 is automatically closed by a check spring or the like to prevent backflow from the gas cylinder 1 to the gas outlet 5, so that the gas in the gas filling fitting 17 is externally discharged. The above-mentioned metal fittings 17
Can be removed in a depressurized state. For this reason,
The metal fitting 17 can be removed with a light force.

The invention according to claim 2 is, for example, shown in FIGS.
4, 7, and 8, 9 and 10, 11, 11, 13, and FIG.
As shown in each of FIGS.
It is configured as follows. Gas inlet 4 and gas in valve box 3
And a shut-off valve 7 provided between the
Gas outlet 5
A gas filling path 10 communicating with the internal space A of the vessel 1;
The gas cylinder 1 is provided in the gas filling path 10 and
The second blockage prevents the flow from the internal space A to the gas outlet 5 described above.
(1) a check valve 11;
And a second check valve for preventing the flow to the first check valve 11
And a gas filling fitting 17 at the gas outlet 5.
It is configured to be attachable. The invention of claim 2 above is basically
In general, the operation is the same as that of the first aspect of the present invention,
1 and 2 (or FIGS. 7 and 8, or 9 and 10)
As shown in FIG. That is, gas
At the time of removal, the gas cylinder is opened by opening the closing valve 7.
The high-pressure gas in 1 passes through the shut-off valve 7 and the second check valve 12 in order.
From the gas outlet 5. During the above gas extraction
In some cases, the backflow gas invades the gas outlet 5 for some reason.
When the second check valve 12 comes in,
, The backflow gas enters the gas cylinder 1.
Can be prevented.

The invention according to claim 3 is, for example, shown in FIGS.
As shown in FIGS. 4, 7, and 8, FIGS. 9, 10, 11, 13, and 14, the valve device is configured as follows. The closing valve 7 and the first
A gas cylinder valve device comprising a check valve (11) and a second check valve (12), wherein the stop valve (7) and the second check valve (12) are disposed between a gas inlet (4) and a gas outlet (5). The second check valve 12 is arranged so as to prevent the flow from the gas outlet 5 to the shut-off valve 7, and the gas filling path 10 is provided in parallel with the shut-off valve 7. One end of the gas filling path 10 is connected to the above-mentioned closing valve 7 and the above-mentioned second
The other end of the gas filling passage 10 is communicated with the internal space A of the gas cylinder 1 through the space between the gas outlet 5 and the check valve 12. Is arranged so that the first check valve 11 prevents the flow from the internal space A to the second check valve 12, and a gas filling fitting 17 can be attached to the gas outlet 5. Configured. The third aspect of the present invention also operates basically in the same manner as the first aspect of the present invention. For example, FIGS. 1 and 2 (or FIGS. 7 and 8 or FIGS. 9 and 10)
As shown in FIG. That is, when taking out the gas, by opening the closing valve 7, the high-pressure gas in the gas cylinder 1 is taken out of the gas outlet 5 through the closing valve 7 and the second check valve 12 in order. If the backflow gas enters the gas outlet 5 for some reason during the gas removal, the second check valve 12 prevents the backflow, so that the backflow gas enters the gas cylinder 1. Can be prevented.

[0017]

【Example】

(First Embodiment) FIGS. 1 and 2 show a first embodiment. First, the schematic configuration of the valve device will be described with reference to the system diagram of FIG.

Valve device 2 fixed to gas cylinder 1
Has a gas inlet 4 and a gas outlet 5 on the outer surface of the valve box 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 filling passage 10 for communicating the gas outlet 5 with the internal space A of the gas cylinder 1 is provided with the shut-off valve 7.
Are provided in parallel with each other. The gas filling path 10 is connected to the gas outlet 5 from the internal space A of the gas cylinder 1.
A first check valve 11 for preventing the flow to the air is provided.

Further, a second check valve 12 for maintaining residual pressure is provided in the outlet passage 9. The second check valve 12 is connected to the shut-off valve 7 and the first check valve 11 through the gas outlet 5.
It is installed to prevent the flow to A relief valve 15 of a rupturable plate type is provided in a relief path 14 branched from the inlet path 8. The gas outlet 5 has a gas filling fitting 17.
Can be connected. The metal fitting 17 is provided with a forced valve opening means 18 for forcibly opening the second check valve 12.

The 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.

As the removal of gas proceeds, the gas cylinder 1
When the residual pressure decreases to the set value, the second check valve 12 is automatically closed by a check spring (not shown). 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 closing 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 new high-pressure gas, the closing valve 7 is kept closed,
The gas filling fitting 17 is connected to the gas outlet 5. Then, the second check valve 12 is opened by manual operation (or the pressure of the filling gas itself) by the forcible valve opening means 18 provided on the metal fitting 17. Next, a high-pressure filling gas is supplied from the fitting 17. 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 FIG. 1 while referring to FIG. The leg screw 21 of the valve box 3 of the valve device 2 is screwed and fixed to the neck 1 a of the gas cylinder 1. While the gas cylinder 1 is being transported or stored, a protective cap (not shown) is fixed to the outer peripheral portion of the neck 1a by screws or the like, and the protective cap covers the valve device 2. The gas inlet 4 is opened on the lower surface of the leg screw portion 21. An outlet nozzle 22 protrudes leftward from an intermediate height of the valve box 3, and the outlet nozzle 22 is connected to the gas outlet 5.
Is opened.

In the valve box 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,
The closing member 26 is opened and closed by the spindle 27 and the handle 28 on the above-mentioned closing valve seat. The spindle 27 and the handle 28 constitute opening / closing operation means 29.

Further, a boss portion 31 projects rightward from the valve box 3. The first check valve 11 is mounted on a cover bolt 32 fixed to the boss portion 31 with a screw. That is, a first check valve seat 33, a first check valve chamber 34, and a communication passage 35 are sequentially provided between the above-described closing valve chamber 25 and the above-mentioned inlet passage 8. The first check member 36 inserted into the first check valve chamber 34 is moved by the first check spring 37 to the first check valve 37.
The check valve seat 33 is closed and contacted. At the time of gas filling, the pressure flowing from the gas outlet 5 into the closing valve chamber 25 causes
The first check member 36 is separated from the first check valve seat 33 against the first check spring 37. The gas filling passage 10 includes an outlet passage 9, a closing valve chamber 25, a first check valve chamber 34, a communication passage 35, and an inlet passage 8, between the gas outlet 5 and the gas inlet 4. And is provided in parallel with the closing valve seat 24.

The second check valve 12 has an outlet nozzle 22
Is housed in a cassette tube 39 fitted inside. That is, the cylindrical second check member 41 inserted into the second check valve chamber 40 is
The second check valve seat 43 is closed and contacted by the internal pressure of the valve chamber 40 and the second check spring 42. When the gas is taken out, the second check member 41 is pressed against the second check spring 42 from the second check valve seat 43 by the pressure gas flowing into the second check valve inlet passage 44 from the close valve chamber 25. Separated. When the gas filling fitting 17 (not shown here) is connected to the outlet nozzle 22, the second check member 41 is moved to the second check valve seat by the valve opening tool 18a of the forced valve opening means 18. 43.

The valve device 2 has the following advantages. Since gas extraction and gas filling can be performed by one gas outlet 5, the gas filling port 113 of the second conventional example shown in FIG. 18B and the gas filling connection of the third conventional example shown in FIG. The port 213 does not need to be provided in the valve box 3, and the gas filling nozzle can be omitted from the valve box 3. Therefore, the valve box 3 can be made small in diameter and low in height. Further, the space in the peripheral wall portion of the closing valve chamber 25 can be used as a mounting space for the first check valve 11, so that the valve box 3 can be made more compact.

Further, since it is not necessary to form a through hole for inserting a gas filling fitting into the gas filling port 113 or the gas filling connection port 213 of the conventional example, the existing protective cap can be used as it is. is there. Further, since gas can be charged from the gas outlet 5, the gas filling fitting 17 can be used.
The existing one shown in FIG. 18A can be used as it is.

The rupture disc type safety valve (not shown here, see the reference numeral 15 in FIG. 2) is provided at the end of the relief path 14 branched from the inlet path 8. The safety valve is mounted on a boss protruding rearward from the valve box 3 in the drawing. Alternatively, the above-described safety valve may be arranged on the right boss portion in the drawing, and the first check valve may be arranged on the back boss portion.

FIGS. 3 to 12 show the second to ninth embodiments. In these embodiments, members having the same functions as those in the first embodiment will be described in principle with the same reference numerals.

(Second Embodiment) FIG. 3 shows a second embodiment. In this case, the first check valve 11 is configured substantially similarly to the second check valve of the first embodiment. That is, the closing valve chamber 2
5 communicates with the inlet passage 8 through the first check valve inlet passage 46 and the first check valve seat 33 in order. The cylindrical first check member 36 inserted into the first check valve chamber 34 is closed and brought into contact with the first check valve seat 33 by the internal pressure of the valve chamber 34 and the first check spring 37. . At the time of gas filling, the first check member 36 is separated from the first check valve seat 33 against the first check spring 37 by the pressure gas flowing into the first check valve inlet passage 46. .

The second check valve of the first embodiment is
Although omitted here, it may be provided in the outlet nozzle 22 or at an intermediate height of the valve box 3.

(Third Embodiment) FIG. 4 shows a third embodiment. In this case, the outlet nozzle 22 protrudes upward from the valve box 3. Further, the closing valve chamber 25 of the closing valve 7 is disposed laterally, and the spindle 27 and the handle 28 are provided to project leftward. Inside the outlet nozzle 22, a second check valve 12 similar to that of the first embodiment is provided. 1st check valve 1
1 is disposed on the opposite side of the above-described closing valve chamber 25 and is provided in parallel with the closing valve seat 24 between the outlet passage 9 and the inlet passage 8. According to this embodiment, the space in the bottom wall portion of the closing valve chamber 25 can be used as a mounting space for the first check valve 11, so that the valve box 3 can be made compact and low in height.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment. The gas filling passage 10 is provided in parallel with the inlet passage 8, and a terminal portion 10 a of the gas filling passage 10 is opened at the lower surface of the leg screw portion 21 (the two-dot chain line diagram in FIG. 2 described above). reference). The first check valve 1 is connected to the terminal portion 10a.
1 is provided. The first check valve 11 includes a leg screw 21
, A first check member 36 attached to the cassette tube 48, and a first check spring 37 for closing and contacting the first check member 36 to the first check valve seat 33. Be composed. The rupture disc type safety valve 15
Is mounted on a boss portion 49 and a cap nut 50 projecting rightward from the valve box 3. Reference numeral 14 denotes an escape route.

In the fourth embodiment, since the cassette cylinder 48 protrudes into the internal space A of the gas cylinder 1, the first check valve 11 can prevent the valve box 3 from being enlarged.

(Fifth Embodiment) FIG. 6 shows a fifth embodiment in which the fourth embodiment of FIG. 5 is modified as follows. The first check valve seat 3 is provided at the end portion 10a of the gas filling passage 10.
3 and the first check valve chamber 34 are sequentially formed. A first check spring 37 for urging the first check member 36 toward the first check valve seat 33
Is received by a cylindrical spring receiving bolt 51. In the fifth embodiment, since the first check valve 11 does not protrude from the valve box 3, the external dimensions of the valve device are further reduced.

(Sixth Embodiment) FIGS. 7 and 8 show a sixth embodiment. FIG. 7 is a diagram corresponding to FIG.
FIG. 8 is a partial sectional view of the above-described FIG.

From the peripheral wall of the closing valve chamber 25, the boss 3
The first check valve 11 is mounted on a boss portion 31 of the first check valve 11. That is, as shown in FIG.
The first check member 36 is inserted into the cylindrical hole 54 of the cover bolt 32. The internal space of the cylindrical hole 54 is communicated with the first check valve chamber 34 by the through hole 55 of the first check member 36.

As shown in FIGS. 7 and 8, the valve box 3 protrudes from the peripheral wall of the closing valve chamber 25 in a direction substantially opposite to the direction in which the boss portion 31 projects. The outlet path 9 is provided in the bulging portion 3a. The outlet nozzle 22 is provided on the peripheral wall at the end of the outlet passage 9. Further, the second check valve 1 is provided at an intermediate portion of the outlet passage 9.
2 is attached. That is, another cover bolt 56 is fixed to the above-mentioned bulging portion 3a, and the second check member 41 is inserted into the second check valve chamber 40 in the other cover bolt 56 in a hermetically sealed manner.
The second check valve chamber 40 communicates with the gas outlet 5,
The above-described closing valve chamber 25 is connected to the second check valve inlet passage 44 through the communication hole 57.

As in the case of the first embodiment (see FIGS. 1 and 2), when the pressure in the internal space A of the gas cylinder 1 exceeds a set value, the gas passes through the closing valve chamber 25 and the above-mentioned state. The second check member 41 is opened against the check spring 42 by the pressure of the gas flowing into the second check valve inlet passage 44, and the pressure in the internal space A is set to the set value. When it is lowered to the above, the second check member 41 is automatically closed by the 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, and the pressure of the inflow gas and the check spring 42 cause the backflow gas to flow. The second check member 41 is strongly pressed against the second check valve seat 43. As a result, the backflow gas does not enter the gas cylinder 1. When the empty gas cylinder 1 is filled with new gas, the above-mentioned second check member 41 may be opened by the valve opening tool 18a of the forced valve opening means 18 provided on the gas filling metal fitting.

In the sixth embodiment, the valve box 3 is bulged in a direction substantially opposite to the boss portion 31 on which the first check valve 11 is mounted, and the gas outlet passage 9 provided in the bulged portion 3a is formed. Since the second check valve 12 is mounted in the middle, the second check valve 12
Is provided, the projecting length of the outlet nozzle 22 from the valve box 3 is short.

(Seventh Embodiment) FIGS. 9 and 10 show a seventh embodiment. FIG. 9 shows the valve device of FIG. 3 in which a means for forcibly opening the first check valve is added. FIG. 10 is a system diagram.

As shown in FIG. 10, the aforementioned second check valve 1
In addition to the forcible valve opening means 18 for two, another means 68 for forcibly opening the first check valve 11 is provided. The other forced valve opening means 68 includes the first check valve chamber 34 and the first
Cylinder hole 76 provided in series with check valve seat 33
And the piston 7 inserted in the cylinder hole 76 in a sealed state.
7 is provided. A piston rod 78 projecting rightward from the piston 77 faces the first check member 36, and a left end face of the piston 77 has a communication hole 7.
9 and faces the external space of the valve box 3. The communication hole 7
9 is covered with a dustproof cap 80.

When the inside of the gas cylinder 1 is evacuated prior to filling the empty gas cylinder 1 with gas, the valve device is operated as follows. With the closing valve 7 kept closed, first, the dustproof cap 80 is connected to the communication hole 7.
Remove from 9. Next, the operating tool 82 is connected to the communication hole 7.
9, the first check member 36 is separated from the first check valve seat 33 by the operating tool 82 via the piston 77 and the piston rod 78.
In this state, a vacuum is drawn from the gas filling fitting 17 connected to the gas outlet 5 of the outlet nozzle 22. Then, the residual gas in the gas cylinder 1 passes from the gas inlet 4 to the outside through the first check valve seat 33, the first check valve inlet passage 46, the closing valve chamber 25, the outlet passage 9 and the gas outlet 5 in this order. It is sucked. During the evacuation, it is preferable that the second check valve 12 is also opened by the forcible valve opening means 18.

During the evacuation, the operating tool 82 may be removed from the communication hole 79. That is, the piston 77 is pressed to the right valve-opening operation side by the differential force between the atmospheric pressure on the communication hole 79 side and the negative pressure on the inlet path 8 side, and is opened by the frictional force of the O-ring 84. Be kept in attitude. In order to strongly hold the operation tool 82 in the valve opening operation posture, an appropriate holding tool is required.
(Not shown) may be provided between the operating tool 82 and the valve box 3.

(Eighth Embodiment) FIG. 11 shows an eighth embodiment in which another forcible valve opening means 68 is added to the valve device of FIG. In this case, the closing valve chamber 25 and the handle 28 are arranged behind the valve box 3, and the cylinder hole 76 and the communication hole 79 of another forcible valve opening means 68 are provided at an intermediate height of the valve box 3. It is provided. The cylinder hole 76 and the closing valve chamber 25 are communicated with each other by a valve seat hole 86.

(Ninth Embodiment) FIG. 12 shows a ninth embodiment in which another forcible valve opening means 68 is added to the valve device of FIG. 12A is a longitudinal sectional view, and FIG. 12B is a sectional view taken along line BB in FIG. 12A.

In this case, the outlet nozzle 22 is disposed at the back of the valve box 3, and the cylinder hole 76 and the communication hole 7 of another forcible valve opening means 68 are provided at an intermediate height at the front of the valve box 3.
9 are provided. The cylinder hole 76 and the closing valve chamber 25 are connected by a groove 88. The outlet passage 9 in the outlet nozzle 22 communicates with the shut-off valve chamber 25 through a hole 89, and the outlet passage 9 has a second check valve similar to that of FIG. (Not shown).

The forcible valve opening means 68 can be applied to the valve device of the sixth embodiment (FIGS. 7 and 8).

FIGS. 13 to 17 show first to fifth modifications of the above-described embodiments, respectively.
FIG. In each modification,
The description will be given by assigning the same reference numerals to the components having the same configuration as in FIG.

(First Modification) As shown in the system diagram of FIG.
A shutoff valve 7 and a pressure reducing valve 62 are provided in order from the gas inlet 4 to the gas outlet 5, and the gas filling path 10 is provided in parallel with the shutoff valve 7 and the pressure reducing valve 62,
A first check valve 11 is provided in the gas filling path 10. The first check valve 11 includes two check valves 11 connected in series.
a.11b. The path between the check valves 11a and 11b and the path between the shut-off valve 7 and the pressure-reducing valve 62 are connected by a branch path 73.
Connected by The second check valve 12 for maintaining the residual pressure includes:
The gas outlet 5 is provided between the check valve 11 b and the pressure reducing valve 62. The flow from the second check valve 12 to the pressure reducing valve 62 is blocked by the third check valve 63.

The gas filling fitting 17 connected to the gas outlet 5 is provided with a forced valve opening means 18 for forcibly opening the second check valve 12. Also, the first check valve 11
Another forcible valve opening means 68 for forcibly opening the other check valve 11b is provided in the valve box 3. Gas inlet 4
And a valve device filter 66 between the
Is provided, and a primary filter 67 for the pressure reducing valve is provided on the inlet side of the pressure reducing valve 62.

A primary safety valve 15 is provided in a relief path 14 branched from the inlet path 8 of the closing valve 7. A pressure reducing outlet side safety valve 65 is connected between the pressure reducing valve 62 and the third check valve 63. Further, a gas introduction passage 70 of a secondary safety valve 69 is communicated with the gas outlet 5, and an opening / closing portion P is provided in the gas introduction passage 70. The opening / closing portion P is provided with an operating portion 71 provided in the forcible valve opening means 18 of the gas filling fitting 17.
It is operated by closing.

The valve device 2 is used as follows. The gas cylinder 1 has a conventional filling pressure (about 150 kg).
The pressure is about 300 kgf / cm ² , which is twice the pressure of f / cm ² ). When the gas is taken out, the high pressure gas in the gas cylinder 1 is reduced to a predetermined pressure by the pressure reducing valve 62 by opening the closing valve 7, and then passes through the third check valve 63 and the second check valve 12 in order. It is taken out from the gas outlet 5.

If the gas outlet 5 has an abnormally high pressure due to a leak from the check valve 11b due to the entry of foreign matter during the gas removal, the abnormal pressure is released from the secondary side safety valve 69. . In addition, even when the gas outlet 5 has an abnormally high pressure due to a foreign substance biting into the pressure reducing valve 62 or the like, the abnormal pressure is released from the secondary safety valve 69 or the pressure reducing outlet safety valve 65 described above. It is. The pressure relief outlet side safety valve 65 may be omitted by setting the relief capacity of the secondary side safety valve 69 to a sufficient value.

If the backflow gas enters the gas outlet 5 for some reason during the gas removal,
The second check valve 12 prevents the backflow, thereby preventing the inside of the gas cylinder 1 from being contaminated with the backflow gas.

When the gas removal proceeds and the residual pressure of the gas cylinder 1 drops to the set pressure, the third check valve 63 is set
(Not shown here), and the second check valve 12 is automatically closed by a spring (not shown). 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 closing valve 7 is accidentally left open, it is possible to prevent the atmosphere from entering the empty gas cylinder 1.

When filling the emptied gas cylinder 1 with high-pressure gas, first, a gas filling fitting 17 is connected to the gas outlet 5. Then, the forced valve opening means 1 provided on the metal fitting 17 is provided.
The above-mentioned second check valve 12 is opened by manual operation (or the pressure of the filling gas) by the step 8. At the same time that the metal fitting 17 is connected, the opening / closing portion P of the gas introduction passage 70 of the secondary safety valve 69
Is closed by the operation unit 71 provided on the fitting 17 of the above. Next, a high-pressure filling gas is supplied from the gas filling fitting 17 with the closing valve 7 closed. Then, the charged gas passes through the second check valve 12 and the first check valves 11b and 11a in order from the gas outlet 5, and is charged into the gas cylinder 1 from the gas inlet 4. In addition, at the time of filling the gas, in the state where the closing valve 7 is opened, the filling gas is charged into the gas cylinder 1 through the above-described path, and passes through the branch passage 73 and the closing valve 7 in order to the gas cylinder 1. Will be filled.

At the time of this gas filling, the opening / closing section P
Is closed, the high-pressure filling gas supplied to the gas outlet 5 does not flow into the secondary side safety valve 69. For this reason, the filling gas is prevented from blowing out from the secondary side safety valve 69. When the inside of the gas cylinder 1 is evacuated prior to the above gas filling, the second check valve 12 and the closing valve 7 are opened and the other first check valve is operated by the forcible valve opening means 68. What is necessary is just to open and operate the valve 11b.

When the gas in the gas cylinder 1 is taken out at a high pressure, the check valve 11b is opened by the forcible valve opening means 68 and the closing valve 7 is opened. Then, the high-pressure gas in the gas cylinder 1 is released from the shut-off valve 7 and the check valve 1
The gas is taken out from the gas outlet 5 through the first check valve 1 b and the second check valve 12.

In the first modification, the first check valve 11 is constituted by the two check valves 11a and 11b connected in series. Therefore, during storage of the gas cylinder 1 with the closing valve 7 closed, the gas cylinder 1 is closed. The gas in the internal space A can be more reliably prevented from leaking to the gas outlet 5 through the gas filling path 10.

(Second Modification) As shown in FIG. 14, this second modification is a simplification of the first modification. That is, only one first check valve 11 is provided in the gas filling path 10, and the other configuration and operation are the same as those of the first modification. When the inside of the gas cylinder 1 is evacuated prior to gas filling, the first check valve 11 may be opened by another forced valve opening means 68.
When the gas in the gas cylinder 1 is taken out at a high pressure, the first check valve 11
Is opened, the high-pressure gas in the gas cylinder 1 passes through the first check valve 11 and the second check valve 12 and is taken out from the gas outlet 5.

(Third Modification) In the third modification, as shown in FIG. 15, the second check valve 12 in FIG. 14 is omitted. The residual pressure of the gas cylinder 1 is maintained by a spring (not shown) of the third check valve 63. The internal pressure of the gas cylinder 1 is checked by the forced valve opening means 6.
The first check valve 11 may be opened by 8. Other configurations and operations are the same as those in FIG. 13 or FIG.

(Fourth Modification) In the fourth modification, as shown in FIG. 16, the third check valve 63 and the pressure reducing outlet side safety valve 65 in FIG. 15 are omitted. This allows
The structure of the valve device 2 can be greatly simplified. Other configurations and operations are the same as those in FIGS. 13 to 15.

(Fifth Modification) In the fifth modification, as shown in FIG. 17, a second check valve 12 is provided between the inlet of the gas filling passage 10 and the first check valve 11. It is a thing. In this case, since the residual pressure can be held only by the spring (not shown) of the third check valve 63, the first modified example of FIG.
4, the residual pressure can be reduced as compared with the second modified example. Other configurations and operations are the same as those in the above-described FIGS.

Each of the above embodiments can be further modified as follows. The opening / closing operation means 29 may be provided with an actuator such as an air cylinder or an electric motor instead of manually operating the handle 28. Closing valve 7
May be constituted by a metal diaphragm type or a ball valve instead of the seat valve type.

[0068]

The invention of claim 1 of the present application has the following effects because it is configured and operates as described above. Since there is no need to open and close the shut-off valve during the gas filling operation, the operation is easy. Further, when the gas filling operation for the gas cylinder is completed, the check valve of the gas filling path prevents the backflow from the gas cylinder to the gas outlet, so that the gas filling fitting can be removed in a depressurized state. For this reason, the metal fitting can be removed with a light force, and the gas filling operation is further facilitated. In order to obtain the above effects, gas filling can be performed from the gas outlet, so that it is not necessary to newly provide a gas filling connection port. For this reason, the nozzle for the connection port can be omitted from the valve box, and the valve box can be made small in diameter and low in height. As a result, it is possible to use an existing protective cap for the valve device of the present invention. Further, since the gas can be charged from the gas outlet as described above, the existing gas charging fitting can be used as it is. For this reason, even when two types of gas cylinders, that is, the gas cylinder provided with the conventional valve device of FIG. 18A and the gas cylinder provided with the valve device of the present invention are mixed, these gas cylinders are provided for each valve device. There is no need to sort, and the gas filling operation can be performed efficiently.

The second aspect of the present invention also relates to the first aspect of the present invention.
The following effects are obtained in the same manner as described above. That is, it is closed during the gas filling operation.
Since there is no need to open and close the stop valve, the operation is easy.
is there. Also, when the gas filling operation to the gas cylinder is completed
At this point, the first check valve of the gas filling passage discharges gas from the gas cylinder.
The gas filling fitting is depressurized because it prevents backflow to the mouth
Can be removed. For this reason, the bracket is light
Can be removed with force, making gas filling easier
Become. In order to obtain the above effect,
Since filling can be performed, it is necessary to provide a new connection port for gas filling.
No need. For this reason, the nozzle for the connection port is removed from the valve box.
It can be omitted, and the valve box can be made small in diameter and low in height. That
As a result, the existing protective cap is used for the valve device of the present invention.
It is possible to do. In addition, the gas outlet as described above
Gas filling can be performed from
It will be available as is. For this reason, the conventional example shown in FIG.
A gas cylinder provided with a valve device and the valve device of the present invention
When two types of gas cylinders are mixed with the installed gas cylinder
Even if this is the case, separate these gas cylinders for each valve device.
There is no need to divide, and the gas filling operation can be performed efficiently.
According to the second aspect of the present invention, the second check valve is provided.
Thus, the following effect is further obtained. That is, when removing gas
By opening the shut-off valve, the high pressure gas in the gas cylinder is
From the gas outlet through the shutoff valve and the second check valve in order.
Will be issued. Some cause during the above gas extraction
If the backflow gas enters the gas outlet,
Of the gas cylinder
It is possible to prevent the backflow gas from entering the air.

The invention of claim 3 is also the invention of claim 2 described above.
The following effects are obtained in the same manner as described above. That is, it is closed during the gas filling operation.
Since there is no need to open and close the stop valve, the operation is easy.
is there. Also, when the gas filling operation to the gas cylinder is completed
At this point, the first check valve of the gas filling passage discharges gas from the gas cylinder.
The gas filling fitting is depressurized because it prevents backflow to the mouth
Can be removed. For this reason, the bracket is light
Can be removed with force, making gas filling easier
Become. In order to obtain the above effect,
Since filling can be performed, it is necessary to provide a new connection port for gas filling.
No need. For this reason, the nozzle for the connection port is removed from the valve box.
It can be omitted, and the valve box can be made small in diameter and low in height. That
As a result, the existing protective cap is used for the valve device of the present invention.
It is possible to do. In addition, the gas outlet as described above
Gas filling can be performed from
It will be available as is. For this reason, the conventional example shown in FIG.
A gas cylinder provided with a valve device and the valve device of the present invention
When two types of gas cylinders are mixed with the installed gas cylinder
Even if this is the case, separate these gas cylinders for each valve device.
There is no need to divide, and the gas filling operation can be performed efficiently.
Also, when removing gas, open the shut-off valve to
The high-pressure gas in the cylinder passes through the stop valve and the second check valve in order.
From the gas outlet. During the above gas removal
For some reason, the backflow gas enters the gas outlet for some reason.
The second check valve prevents the backflow.
This prevents backflow gas from entering the gas cylinder.
Wear.

In the above configuration, the following effects can be further obtained when the configuration is as follows. The gas charge
One end of the filling path communicates with the gas outlet via the closing valve chamber
And the other end of the gas filling path is connected to the inlet path.
Communicated to the interior space of the gas cylinder via, in case of providing the gas <br/> scan fill channel in parallel with the stop valve seat between the stop valve chamber and the inlet passage of the closing valve of the Since the space in the peripheral wall portion of the closing valve chamber can be used as a mounting space for the check valve in the gas filling path, the valve box can be made compact.

One end of the gas filling path passes through the exit path.
To communicate with the gas outlet,
The end communicates with the interior space of the gas cylinder via the above-mentioned entrance path
And, above in parallel with the stop valve seat between said outlet passage and the inlet passage
Also in the case where the gas filling path is provided, the space of the bottom wall portion of the above-mentioned closing valve chamber can be used as a mounting space for the check valve of the gas filling path, so that the valve box can be made compact and low in height.

[0073] The gas filling path is provided in parallel to the inlet passage, the case of providing the check valve of the the end portion of the gas-filled path, prevent the the check valve projects from the valve box Because of this, the valve device becomes more compact.

[0074] The pressure reducing valve is provided between the said gas outlet and a closed valve, the gas to these shut-off valve and the pressure reducing valve
When the filling paths are provided in parallel, the above-described effects of the present invention can be achieved even when the high-pressure gas in the gas cylinder is taken out under reduced pressure.

When the means for forcibly opening the check valve of the gas filling path is provided, the following effects are obtained. That is, when the gas cylinder is evacuated prior to the filling operation of the empty gas cylinder, the check valve is forcibly opened, so that the gas is evacuated from the gas outlet while the closing valve is closed. Can be performed. For this reason,
The operation of opening the closing valve can be omitted.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a valve device for a gas cylinder,
It is a longitudinal section of the valve device.

FIG. 2 is a system diagram of the valve device.

FIG. 3 is a view showing a second embodiment of the valve device and corresponding to FIG. 1 described above.

FIG. 4 is a view showing a third embodiment of the valve device and corresponding to FIG. 1 of the above.

FIG. 5 is a partial view showing a fourth embodiment of the valve device and corresponding to FIG. 1 of the valve device;

FIG. 6 is a view showing a fifth embodiment of the valve device and corresponding to FIG. 5 described above.

FIG. 7 is a view showing a sixth embodiment of the valve device and corresponding to FIG. 1 described above.

8 is a partial cross-sectional view of the valve device of FIG. 7 as viewed from the left side.

FIG. 9 is a view showing a seventh embodiment of the valve device and corresponding to FIG. 3 described above.

FIG. 10 is a system diagram of the valve device shown in FIG. 9;

FIG. 11 is a view showing an eighth embodiment of the valve device and corresponding to FIG. 4 described above.

FIG. 12 shows a ninth embodiment of the valve device,
12A is a view corresponding to FIG. 1 described above, and FIG. 12B is a cross-sectional view taken along line BB in FIG. 12A.

FIG. 13 is a view showing a first modification of the valve device of each of the above-described embodiments, and is a view corresponding to FIG. 2 described above.

FIG. 14 is a view showing a second modified example of the valve device, and corresponding to FIG. 2 in the same.

FIG. 15 is a view showing a third modified example of the valve device and corresponding to FIG. 2 of the above.

FIG. 16 is a view showing a fourth modified example of the valve device, and corresponding to FIG. 2 of the above.

FIG. 17 is a view showing a fifth modification of the above-mentioned valve device and corresponding to FIG. 2 of the above-mentioned valve device.

FIG. 18 (a) shows a first conventional example, and FIG. 18 (b)
Shows a second conventional example, and FIG. 18C shows a third conventional example.
3 is a diagram corresponding to FIG. 2 described above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... gas cylinder, 3 ... valve box, 3a ... bulging part, 4 ... gas inlet, 5 ... gas outlet, 7 ... shut-off valve, 8 ... inlet path, 9 ... outlet path, 10 ... gas filling path, 10a ... gas filling End portion of path 10, 11 ... check valve (first check valve), 12 ... another check valve
(Second check valve), 17: gas filling fitting, 24: closing valve seat,
25 ... closing valve chamber, 26 ... closing member, 29 ... opening and closing operation means
(Spindle 27 and handle 28), 31 ... boss part, 3
3 ... check valve seat (first check valve seat), 34 ... check valve chamber (first check valve chamber), 36 ... check member (first check member), 42 ... check spring, 62 ... pressure reducing valve, 68 ... (separate) forced valve opening means, 76
... Cylinder hole, 77 ... Piston, A ... Inner space of gas cylinder 1.

──────────────────────────────────────────────────続 き Continued on the front page (72) Noriaki Arai 4-6-1 Shimosakabe, Amagasaki City, Hyogo Prefecture Neriki Co., Ltd. (72) Inventor Teruo Hatori 4-6-1 Shimosakabe Amagasaki City, Hyogo Prefecture Neriki Co., Ltd. (56) References JP-A-6-174197 (JP, A) JP-A-2-34900 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F17C13 / 04 301

Claims (9)

(57) [Claims] 1. A gas inlet (4) and a gas outlet (4) in a valve box (3).
A gas cylinder valve device provided with a shut-off valve (7) between the gas cylinder (5) and a gas filling path (10) for communicating the gas outlet (5) with the internal space (A) of the gas cylinder (1). The gas filling passage (10) is provided in parallel with the shut-off valve (7) to prevent a flow from the internal space (A) of the gas cylinder (1) to the gas outlet (5). A check valve (11) is provided and the gas outlet
(5) A gas filling fitting (17) is configured to be attachable.
A valve device for a gas cylinder characterized by the above. 2. A gas inlet (4) and a gas outlet in a valve box (3).
A shut-off valve (7) provided between the gas cylinder (5) and the shut-off valve (7), and the gas outlet (5) communicates with the internal space (A) of the gas cylinder (1). Gas filling path (10)
And the gas cylinder provided in the gas filling path (10).
(1) a first check valve (11) for preventing a flow from the internal space (A) to the gas outlet (5), and a shut-off valve (7) from the gas outlet (5) to the gas outlet (5). A second check valve (12) for preventing flow of the gas to the first check valve (11).
(5) A gas filling fitting (17) is configured to be attachable.
A valve device for a gas cylinder characterized by the above. 3. A shut-off valve (7) and a first check valve in a valve box (3).
(11) A gas cylinder valve device provided with a second check valve (12), wherein the closing valve (7) and the second check valve (12) are connected to a gas inlet (4). The second check valve (12) is arranged between the gas outlet (5) and the gas outlet (5) so as to block the flow from the gas outlet (5) to the shut-off valve (7). A gas filling passage (10) is provided in parallel with the shut-off valve (7), and one end of the gas filling passage (10) is connected between the above-mentioned closing valve (7) and the above-mentioned second check valve (12). gas cylinder and the other end of the same gas-filled path (10) with through between communicating to the gas outlet (5)
Communicating to the internal space (A) (1), by placing the first check valve (11) to the gas filling path (10), the first check valve
(11) is configured to prevent the flow from the internal space (A) to the second check valve (12), so that a gas filling fitting (17) can be attached to the gas outlet (5). A valve device for a gas cylinder, comprising: 4. The gas cylinder valve device according to claim 1, wherein the gas inlet (4) is connected to an inlet passage (8), the shutoff valve (7), and an outlet passage (9). Through the gas outlet (5), and the above-mentioned closing valve (7) is connected to the closing valve seat (24) and the closing valve chamber (2).
5) and a closing member (26) inserted into the closing valve chamber (25) and opened and closed with respect to the closing valve seat (24). 5. The valve device for a gas cylinder according to claim 4, wherein one end of the gas filling passage (10) passes through the closing valve chamber (25).
To the gas outlet (5)
Connect the other end of the filling path (10) to the gas
Communicating the interior space to the (A) of the base (1), the gas filling path (10), said closure valve chamber (25) above
Characterized in that it is provided in parallel with the closing valve seat (24) between the inlet valve (8) and the inlet passage (8). 6. The gas cylinder valve device according to claim 4, wherein one end of the gas filling passage (10) is connected through the outlet passage (9).
And communicate with the gas outlet (5)
Connect the other end of the passage (10) to the gas cylinder via the entrance passage (8).
(1) communicates with the internal space (A) of the gas filling path (10), said closure valve between the outlet passage (9) above input <br/> port passage (8) A valve device for a gas cylinder, which is provided in parallel with a seat (24). 7. The gas cylinder valve device according to claim 4, wherein the gas filling passage (10) is provided in parallel with the inlet passage (8), and an end portion of the gas filling passage (10). A valve device for a gas cylinder, wherein the check valve (11) is provided in (10a). 8. The gas cylinder valve device according to claim 1, wherein a pressure reducing valve is provided between the closing valve (7) and the gas outlet (5).
(62), the shut-off valve (7) and the pressure reducing valve (6)
A valve device for a gas cylinder, wherein the gas filling path (10) is provided in parallel with 2). 9. The gas cylinder valve device according to claim 1, wherein the check valve (11) provided in the gas filling path (10) is forcibly opened. 68) A valve device for a gas cylinder, comprising: