JP2001304498A - Valve device for gas cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device to allow any ordinary user to handle easily, capable of restricting the gas filling person(s) to a gas cylinder, and requiring no operation to open a shutoff valve at the time of gas filling. SOLUTION: In a housing 3, the internal space A of a gas cylinder 1 is put in communication with a gas takeout hole 5 via a gas lead-in passage 11, shutoff valve 12 and gas leadout passage 13, and also put in communication with a gas filling hole 6 via a gas filling passage 14. The gas leadout passage 13 is equipped with a decompression valve 15 and a first check valve 16 for holding the residual pressure in the sequence as named from the upstream, and it is arranged so that a gas takeout metal piece 57 can be connected with the gas takeout hole 5. The gas filling hole 6 is equipped with a second check valve 17 to hinder the gas flowing from the space A to the gas filling hole 6, and it is arranged so that a proprietary gas filling metal piece 57 having different connecting structure from the gas takeout metal piece 57 can be connected with the gas filling hole 6.

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 As a valve device of this type, a device previously proposed by the present applicant has been disclosed in Japanese Patent No. 2821699.
There is something shown in the issue. It has a gas inlet, a shut-off valve, a pressure reducing valve, a first check valve for maintaining residual pressure in the housing,
A gas outlet serving also as a gas filling port is provided in series in order, and a bypass is provided in parallel with the pressure reducing valve between the outlet of the shut-off valve and the first check valve, and a shut-off valve is provided in the bypass. A second check valve for preventing a flow from the outlet to the gas outlet is provided, and the piston of the pressure reducing valve is opened and closed by a balancing force between a valve opening spring force and a valve closing secondary pressure. It is configured as follows.

[0003]

According to this prior art, the gas in the gas cylinder can be taken out at a reduced pressure by the pressure reducing valve at the time of taking out the gas, and the filling gas supplied from the gas outlet at the time of filling the gas can be taken out. In addition, the gas cylinder can be filled through the opening gap between the bypass passage having a small flow resistance and the shutoff valve, so that the gas cylinder is excellent in that the filling time is short. However, there was room for improvement in the following points.

In order to fill the gas from the gas outlet which also serves as the gas filling port, it is necessary to open the above-mentioned closing valve and fill the gas into the gas cylinder. Further, since the gas outlet also serves as the gas filling port, it is necessary to make the connecting portion between the gas outlet and the gas outlet fitting a durable connection structure that can withstand high-pressure gas filling, resulting in an increase in cost. Moreover, since the gas outlet that also serves as the gas filling port has a screw connection structure in the related art, not only does it take time to screw and connect the gas takeout fitting or the gas filling fitting, but it is also difficult for general consumers to use. . On the other hand, since the gas filling port has a screw connection structure, the person who fills the gas cannot be limited to a specific person, so that filling of low-quality gas cannot be excluded. SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive valve device which is easy for general consumers to use, eliminates the filling of low-quality gas by limiting the number of gas fillers, and does not require the opening of a shut-off valve during gas filling.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a gas cylinder valve device is constructed as follows, for example, as shown in FIGS. In the housing 3, the internal space A of the gas cylinder 1 communicates with the gas outlet 5 through the gas introduction path 11, the shutoff valve 12, and the gas outlet path 13 in order, and the internal space A
Is connected to the gas charging port 6 via the gas charging path 14. A pressure reducing valve 15 and a first check valve 16 for maintaining residual pressure are sequentially provided in the gas outlet path 13 from the upstream side, and a gas outlet fitting 57 can be connected to the gas outlet 5. Further, a second check valve 17 for preventing a flow from the internal space A to the gas filling port 6 is provided in the gas filling path 14,
The gas filling port 6 is characterized in that a dedicated gas filling fitting 58 having a different connection structure from the gas extraction fitting 57 can be connected.

According to a second aspect of the invention, the following feature is added to the first aspect of the invention. That is, in the valve device for a gas cylinder described in claim 1, for example, FIGS.
As shown in (1), the gas extraction fitting 57 is constituted by a quick joint.

[0007] The third aspect of the present invention is the first or second aspect.
In the valve device for a gas cylinder described in the above, for example, as shown in FIGS. 1, 4, 5 and 9, the pressure reducing valve 15
A check valve mounting hole 55 of the first check valve 16 and a safety valve mounting hole 54 of the secondary safety valve 19 are provided in a branch chamber 44 downstream of the first check valve 16. The safety valve mounting hole 54, the branch chamber 44, and the check valve mounting hole 55 are formed on the same central axis X from one side of the housing 3 toward the gas outlet 5. And

According to a fourth aspect of the present invention, in the gas cylinder valve device according to the third aspect, as shown in FIGS. 4 and 5, for example, the safety valve mounting hole 54 and the check valve mounting hole 55 are provided.
With respect to the central axis X of the pressure reducing valve 15.
Are arranged crossing each other on different planes.

According to a fifth aspect of the present invention, in the gas cylinder valve device according to the third aspect, for example, as shown in FIG. 9, a center axis X of the safety valve mounting hole 54 and the check valve mounting hole 55 is provided. The central axis Y of the pressure reducing valve 15 is disposed substantially on the same plane, and the pressure reducing sleeve 40 of the pressure reducing valve 15 is provided in the branch chamber 44 so as to intersect with the central axis X.

The invention of claim 6 is the invention of claims 1 to 5
In the valve device for a gas cylinder described in any one of the above, for example, as shown in FIGS. 4, 5, and 9, the first check valve 16 is provided so as to face the gas outlet 5. The first check member 62 of the check valve 16 is connected to the gas outlet 5.
A valve opening preventing means 10 for preventing the valve opening operation from being performed,
It is characterized in that it is constituted by the spring receiving member 60c of the first check valve 16.

[0011] The invention of claim 7 is the invention of claims 1 to 6.
In the valve device for a gas cylinder described in any one of the above, for example, as shown in FIGS. 1, 2 and 7, a float type remaining amount displaying the remaining amount of the liquefied gas G in the gas cylinder 1 on the housing 3. A display device 20 is provided. The rod insertion hole 8 of the remaining amount display device 20 is, for example, shown in FIGS.
As shown in FIG. 5, the surplus wall portion 37 near the shut-off valve 12 in plan view is provided, and the display cylinder 92 of the remaining amount display device 20 is disposed in parallel with the rod insertion hole 8. To be provided. The display scale 9 of the display tube 92
2 a is provided so as to be exposed from the excess wall portion 37.

[0012]

According to the present invention, the following operations and effects are obtained. (A) According to the first aspect of the present invention, the gas outlet 5 and the gas filling port 6 are separately provided, and the gas depressurized by the pressure reducing valve 15 can be taken out from the gas outlet 5. That is,
The connection portion of the gas outlet 5 does not need to have a strong connection structure that can withstand the filling of the high-pressure gas, and the valve device can be manufactured inexpensively correspondingly.

(B) According to the first aspect of the present invention, the residual pressure in the gas cylinder having consumed the gas can be maintained at the set pressure to prevent the gas cylinder from being contaminated. That is, when the shut-off valve 12 is opened at the time of gas removal, the high-pressure gas in the internal space A of the gas cylinder 1 is reduced to a predetermined pressure by the pressure reducing valve 15, and is connected to the gas outlet 5 through the first check valve 16. It is taken out via the gas takeout fitting 57. If the backflow gas enters the gas outlet 5 for any reason during the gas removal, the first check valve 16
This prevents the backflow and prevents the inside of the gas cylinder 1 from being contaminated with the backflow gas. When the removal of gas proceeds and the residual pressure in the gas cylinder 1 decreases to the set pressure, the first check valve 16 is automatically activated by the first check spring (reference numeral 63 in FIGS. 4 and 9). Closed. This allows
Further removal of the gas is prevented, the residual pressure in the gas cylinder 1 is maintained at the set pressure, and the gas cylinder is prevented from being contaminated in this respect as well.

(C) In the first aspect of the present invention, the gas filling path 1
4 is provided with a second check valve 17 for preventing a flow from the internal space A of the gas cylinder 1 to the gas filling port 6, and the gas filling port 6 is provided with a dedicated gas filling having a connection structure different from that of the gas extraction fitting 57. Since the fitting 58 is configured to be connectable, only the gas supplier having the dedicated gas filling fitting 58 can be limited as a gas filler. This makes it possible to indirectly exclude the supply of low-quality gas and designate a healthy gas supplier.

(D) When filling the emptied gas cylinder 1 with high-pressure gas, the gas is injected from the dedicated filling port 6 with the closing valve 12 kept closed. Then, the gas is charged into the gas cylinder 1 through the second check valve 17 provided in the charging path 14 and the gas introduction path 11. This eliminates the need to open the shut-off valve when filling gas,
No need for gas filling work.

(E) In the second aspect of the invention, in the gas cylinder valve device according to the first aspect, since the gas outlet fitting 57 is formed by a quick coupling, a general customer is constituted by a quick coupling at the gas outlet. Since the gas extraction fitting can be easily connected, the cylinder valve can be easily used. In addition, since a high pressure during gas filling is not applied to the gas outlet as described above, even a quick joint having a relatively complicated connection structure can be implemented at low cost, so that the burden on general consumers can be reduced.

(F) In the third aspect of the present invention, in the gas cylinder valve device according to the first or second aspect,
The first check valve 1 is provided in the branch chamber 44 downstream of the pressure reducing valve 15.
6 is provided facing the check valve mounting hole 55 of the secondary safety valve 19 and the safety valve mounting hole 54 of the secondary safety valve 19, and the safety valve mounting hole 54 and the branch chamber are provided from one side of the housing 3 toward the gas outlet 5. Since the check valve mounting hole 44 and the check valve mounting hole 55 are formed on the same central axis X, the hole can be manufactured at a low cost by forming a hole from one direction. Also, as shown in FIG. 4, the first check valve 16 is inserted through the safety valve mounting hole 54 to be mounted in the check valve mounting hole 55, and the secondary safety valve 19 is mounted in the safety valve mounting hole 54. , The first check valve 1 from the gas outlet side
As compared with the case of mounting 6, the member corresponding to the cover bolt is not required, and the member does not protrude from the housing 3.

(G) According to the fourth aspect of the present invention, in the valve device for a gas cylinder according to the third aspect, there is provided a gas cylinder valve device as shown in FIGS.
As shown in the figure, the safety valve mounting hole 54 and the check valve mounting hole 5
Since the central axis Y of the pressure reducing valve 15 is arranged so as to intersect on a different plane with respect to the central axis X of the valve 5, the first check valve 16 and the secondary safety valve 19 are mutually connected in the housing 3. It can be installed compactly with the closest approach.

(H) In the fifth aspect of the present invention, in the gas cylinder valve device according to the third aspect, as shown in FIG. 9, for example, the safety valve mounting hole 54 and the check valve mounting hole 55 are provided.
With respect to the central axis X of the pressure reducing valve 15.
Are arranged on substantially the same plane, the branch chamber 44 serves as a common gas flow path for the pressure reducing valve 15, the first check valve 16, and the secondary safety valve 19. Further, since the pressure reducing sleeve 40 of the pressure reducing valve 15 is provided in the branch chamber 44 so as to intersect with the central axis X, the three valves 15, 16, and 19 are brought closest to the housing 3 so as to be compact. Can be incorporated.

According to the invention of claim 6, in the valve device for a gas cylinder according to any one of claims 1 to 5, the first check valve 16 is provided so as to face the gas outlet 5.
The valve opening preventing means 10 for preventing the first check member 62 of the first check valve 16 from being opened from the gas outlet 5 is provided with the spring receiving member 60c of the first check valve 16. Since the valve opening preventing means can be used also by the spring receiving member 60c, the valve opening preventing means can be manufactured with a simple configuration at a low cost.

(H) According to the invention of claim 7, in the gas cylinder valve device according to any one of claims 1 to 6, the rod insertion hole 8 of the float type remaining amount display device 20 is viewed in a plan view. And a display cylinder 92 of the remaining amount display device 20 is disposed in parallel with the rod insertion hole 8 in the excess wall portion 37 in the vicinity of the closing valve 12.
Therefore, the housing itself can be made compact by effectively utilizing the dead space (excess wall portion) near the shutoff valve. Further, since the display scale portion 92a of the display cylinder 92 is provided so as to be exposed from the surplus wall portion 37, the remaining amount of the liquefied gas in the gas cylinder can be visually recognized at a glance.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the outline of the valve device according to the present invention will be described based on the system diagram of FIG. The valve device 2 includes a housing 3 mounted on a gas cylinder 1.
A gas inlet 4 and a rod insertion hole 8 of a remaining amount display device 20 to be described later are provided on the bottom surface, and a gas outlet 5 and a dedicated gas filling port 6 are provided on a side surface of the housing 3. Then, inside the housing 3, the internal space A of the gas cylinder 1 is communicated with the gas outlet 5 through the gas inlet 4, the gas introduction path 11, the shutoff valve 12, and the gas outlet path 13, and is connected to the gas introduction path 11. The gas filling port 6 is connected to the gas filling port 6 via a gas filling path 14. Further, the housing 3 is provided with a float type remaining amount display device 20 for displaying the remaining amount of the liquefied gas G through the rod insertion hole 8.

The gas outlet passage 13 is provided with a pressure reducing valve 15 and a first check valve 16 for maintaining the residual pressure in this order from the upstream side, and faces a branch chamber 44 downstream of the pressure reducing valve 15. 1
A check valve 16 and a secondary safety valve 19 are provided. The branch chamber 44 is also a common gas flow path of the first check valve 16 and the secondary safety valve 19. In addition, a second check valve 17 for preventing a flow to the gas filling port 6 is provided in the filling path 14, and is connected to a gas introducing path 11 from the gas inlet 4 to the closing valve 12 so as to communicate with a primary safety valve 18. Is provided.

The gas cylinder 1 has a filling pressure [about 15
MPa] or more (for example, about 15 MPa (about 150 kgf / c
m ² ) to about 30 MPa (about 300 kgf / cm ² )), and the valve device 2 is used as follows. When taking out the gas, the gas take-out fitting 57 constituted by a quick coupling is connected to the gas take-out port 5 and the shut-off valve 12 is opened. Then, the high-pressure gas in the internal space A of the gas cylinder 1 is reduced to a predetermined pressure by the pressure reducing valve 15,
The gas is taken out from the gas outlet 5 through the check valve 16. The gas outlet fitting 57 using the quick coupling is intended to make it easy for general consumers to easily connect to the gas outlet 5 in the field of beverage gas, for example, and to make the cylinder valve easier to use. is there.

During the above gas removal, the pressure reducing valve 15
When the gas outlet 5 has an abnormally high pressure due to a foreign substance being caught in the gas, the abnormal pressure is released from the secondary safety valve 19. If the backflow gas enters the gas outlet 5 for any reason during the gas removal, the backflow is prevented by the first check valve 16 and the inside of the gas cylinder 1 is contaminated with the backflow gas. To prevent In addition, when the removal of gas proceeds and the residual pressure in the gas cylinder 1 decreases to the set pressure, the first check valve 16 is automatically closed by the check spring (reference numeral 63 in FIGS. 4 and 9). As a result, further removal of the gas is prevented, and the residual pressure in the gas cylinder 1 is maintained at the set pressure. As a result, even if the shut-off valve 12 is accidentally left open, it is possible to prevent the atmosphere from entering the gas cylinder 1 and being contaminated.

On the other hand, when filling the emptied gas cylinder 1 with a high-pressure liquefied gas (hereinafter, simply referred to as "high-pressure gas"), the gas discharge port 6 is supplied to the gas filling port 6 with the closing valve 12 kept closed. A dedicated gas filling fitting 58 having a different connection structure from the fitting 57 is connected, and high-pressure gas is filled from the gas filling port 6. Then, the high-pressure gas is supplied to the second check valve 17.
And the gas introduction path 11 in order to fill the gas cylinder 1. It should be noted that the exclusive gas filling fitting 58 is intended to limit only a gas supplier having the exclusive gas filling instrument 57 as a gas filler, and thereby indirectly reduce the quality of the gas. The gas supply can be eliminated and a healthy gas supplier can be designated.

Next, a specific structure of the valve device 2 will be described in detail with reference to a first embodiment and a second embodiment. 2 to 6 show a valve device according to the first embodiment, FIG. 2 is a front view in which a part of the valve device is cut,
3 is a vertical cross-sectional view taken along line AA in FIG. 2, FIG. 4 is a cross-sectional plan view taken along line BB in FIG. 2, and FIG. 5 is a vertical cross-sectional view taken along line CC in FIG. 6 is a cross-sectional plan view taken along line DD in FIG.

As shown in FIG. 2, the leg screw 30a of the valve device 2 according to the present invention is screwed and fixed to the neck of the gas cylinder 1. A protection cap (not shown) of the valve device 2 is attached to the neck screw portion 1a of the gas cylinder 1. A gas inlet 4 and a rod insertion hole 8 of the remaining amount display device 20 are opened on the lower surface of the leg 30 of the housing 3 constituting the valve device 2, and the filling port 6 is formed on the left side of the housing 3. The gas outlet 5 is opened on the upper right side of the housing 3.

As shown in FIG. 3, the shut-off valve 12 is
It is provided in the upper half of the housing 3. That is, a closing valve seat 21 is formed at an upper end of the gas introduction passage 11, and a closing valve chamber 22 extending vertically above the closing valve seat 21.
Is formed, and a closing member 24 screwed into the closing valve chamber 22 is formed.
Are moved toward and away from the closing valve seat 21. A first male screw cover 26 is screwed into the upper surface boss portion 31 of the housing 3 and fixed.
Is inserted in an airtight manner, the lower portion 27b of the spindle 27 is rotatably fitted into the closing member 24, and the operation handle 28 is attached to the upper portion 27a of the spindle 27.

As shown in FIG. 3, the pressure reducing valve 15 is provided inside the back boss 32 protruding from the rear of the housing 3 at an intermediate position in the vertical direction.
It is provided in a position facing. That is, the pressure reducing valve chamber 43 of the pressure reducing valve 15 is formed facing the gas outlet path 13. A pressure reducing valve seat 42 is formed at the end of the gas outlet passage 13, and a small-diameter pressure reducing valve member 46 constituting a pressure reducing operating body 45 is provided so as to be able to approach and separate from the pressure reducing valve seat 42. The pressure reducing valve member 46 is provided so as to be able to advance and retreat via a guide sleeve 39, and an outer peripheral flange portion 39 a of the guide sleeve 39 is fixed to the inner end surface of the cover bolt 50 so as not to come off.

The pressure reducing member 45 is connected to the pressure reducing valve member 46.
And a large-diameter piston 47. The pressure-reducing valve member 46 projects airtightly into the pressure-reducing valve chamber 43, and the piston 47 airtightly enters a pressure-reducing operating chamber 51 formed in a cover bolt 50. The pressure reducing body 45 is inserted into the valve opening spring 52.
To the valve opening side. The decompression working chamber 51 includes:
A communication hole 48 formed in the pressure reducing body 45 communicates with the pressure reducing valve chamber 43. The leftward valve opening force of the valve opening spring 52 and the piston 4
The balance force with the rightward closing force acting on the valve 7 causes the pressure reducing valve member 46 to open and close the pressure reducing valve seat 42.

The first check valve 16 for holding the residual pressure is shown in FIG.
As shown in the figure, the secondary safety valve 19 is provided inside a right-side boss 33 protruding from the upper half of the right side of the housing 3, and protrudes from the upper half of the left side of the housing 3. The boss 34 is provided inside the left boss 34. These first
The check valve 16 and the secondary safety valve 19 are provided on a common central axis X, and both of them face the branch chamber 44. The first check valve 16 and the secondary safety valve 19 are provided with a common sleeve 60 constituting a valve box. The first check valve 16 is provided on the front half 60a of the common sleeve 60 and the secondary safety valve 1 is provided.
Numeral 9 is incorporated in the rear half portion 60b of the common sleeve 60 in the form of a cassette, and a branch communication passage 44a communicating with the branch chamber 44 is formed in an intermediate portion of the common sleeve 60. As shown in FIG. 5, the pressure reducing chamber 43 of the pressure reducing valve 15
The upper edge portion and the lower edge portion of the branch chamber 44 communicate with each other via a communication portion 43a between them.

In the first embodiment, the left boss 34
From the left end face to the inside of the right face boss portion 33, the safety valve mounting hole 54 of the secondary safety valve 19, the branch chamber 44, and the first
The check valve mounting hole 55 of the check valve 16 is formed on the same center axis X, and the first check valve 16 is mounted in the check valve mounting hole 55 through the safety valve mounting hole 54 on the left side. The safety valve 19 is mounted in the safety valve mounting hole 54. As shown in FIGS. 3, 4 and 5, the pressure reducing valve 1 with respect to the common central axis X of the safety valve mounting hole 54 and the check valve mounting hole 55.
The center axis Y of 5 is shifted downward and crossed on different planes.

As described above, since the first check valve 16 is mounted in the check valve mounting hole 55 through the left safety valve mounting hole 54, the first check valve 16 is mounted from the gas outlet 5 side. In comparison, a member corresponding to the cover bolt becomes unnecessary, and the member does not protrude from the housing 3. The branch chamber 44 serves as a common gas flow path for the pressure reducing valve 15, the first check valve 16, and the secondary safety valve 19, and differs from the axis X by shifting the center axis Y of the pressure reducing valve 15 downward. Since the first non-return valve 16 and the secondary safety valve 19 are arranged closest to each other in the housing 3, they can be integrated in a compact manner.

The first check valve 16 is provided with a spring receiver 60c on the front half 60a of the common sleeve 60 constituting the valve box.
Is assembled through a screw hole, and the first check valve seat 6 is inserted therein.
1, the first check member 62 and the first check spring 63 are assembled, and the first check member 62 is
The first half 60a of the common sleeve 60 is airtightly fitted into the check valve mounting hole 55 by being brought into contact with the check spring 63.

A first check valve seat 61 is formed in the front half 60a of the common sleeve 60. The first check spring 63
Is received by the bottomed cylindrical spring receiving member 60c,
Its resilience can be adjusted. Thereby, the branch chamber 44
The gas pressure inside pushes the first check member 62 open against the valve closing force of the first check spring 63, and the gas pressure from the gas outlet 5 through the check valve mounting hole 55 on the outer periphery of the spring receiver 60 c. leak. When the gas pressure in the gas cylinder 1 becomes equal to or lower than a predetermined value, the first check spring 63 closes the first check member 62, and contaminated outside air flows into the gas cylinder 1 from the gas outlet 5. To prevent The spring receiving member 60c, which is the valve opening prevention means 10, prevents the first check member 62 from being opened from the gas outlet 5.

The secondary safety valve 19 is provided with a spring receiver 60d on the rear half 60b of the common sleeve 60 constituting the valve box.
And a safety valve seat 66 composed of an O-ring, a safety valve body 67 and a valve closing spring 68 are assembled therein, and the safety valve body 67 is closed with respect to the safety valve seat 66 by the spring 6.
8, and the rear half 60b of the common sleeve 60 is screwed into the safety valve mounting hole 54.

Thus, when the gas pressure in the branch chamber 44 becomes abnormally higher than the set pressure, the safety valve 67 is opened against the closing force of the valve closing spring 68, and the gas is released to the safety valve. The safety valve chamber 69 around the valve 67 is released to the atmosphere through the air communication hole 69b. When the gas pressure in the gas cylinder 1 falls below a predetermined value, the safety valve 67 is closed by the valve closing spring 68 to prevent the contaminated outside air from flowing into the gas cylinder 1 from the atmosphere communication hole 69b. I do.

As shown in FIGS. 2 and 6, the gas filling port 6 is formed with an opening in a left boss portion 36 projecting from the left side of the housing 3 at an intermediate height. A dedicated gas filling fitting 58 is mounted via a hooking portion 70 formed on the outer periphery, so that high-pressure gas can be filled from the gas filling port 6. Gas filling fitting 5
8 has a different connection structure from the gas extraction fitting 57. This is to designate a gas filler as a specific person and to prevent the filling of low-quality gas.

The second check valve 17 is provided in the vicinity of the gas filling port 6 and in the middle of the gas introduction path 11.
As shown in FIGS. 2 and 6, the second check valve 17 forms a second check valve box 71 by attaching a bottomed cylindrical second spring receiving member 73 to a second sleeve 72. Second check valve box 7
1, a second check valve seat 74, a second check member 75, and a second check spring 76 are assembled in a cassette type into a second check valve seat 74.
A second check member 75 is contacted by a second check spring 76, and the second sleeve 72 is screwed into the gas filling port 6 in an airtight manner.

A gas introduction chamber 77 communicating with the gas introduction passage 11 is formed on the outer periphery of the second check valve box 71, and a second check valve seat 74 is provided on the gas filling port side in the second sleeve 72. It is formed. The second check spring 76 is received by the second spring receiving member 73 and can adjust the valve closing force. As a result, the gas pressure on the gas filling port 6 side opens the second check member 75 against the valve closing force of the second check spring 76, and the liquefied gas G flows through the gas introduction groove 77. The gas is filled into the gas cylinder 1 through the introduction path 11.

As shown in FIGS. 3 and 6, the primary safety valve 18 is provided inside a front boss 35 protruding from the upper and lower middle portion of the front of the housing 3 and has a valve communication passage facing the gas introduction chamber 77. A rupture disk (rupture disk) 83 was attached to the paragraph section 81 of the 80 via a sealing ring 82, and the rupture disk 83 was pressed and fixed with a cover bolt 84, and the gas pressure in the gas cylinder 1 became abnormally high. At this time, the rupture disk 83 ruptures and the high-pressure gas is
4 through the gas release passage 85 formed in the air release hole 86.
It is configured to be more released.

As shown in FIGS. 1, 2 and 4, in the float type remaining amount display device 20, a connecting rod 88 is inserted into the rod insertion hole 8, and a permanent magnet 91 is fixed to the upper end of the connecting rod 88. A transparent display cylinder 92 having a display scale is provided in the upper half of the housing 3, and a magnetic ring 93 that follows the vertical movement of the permanent magnet 91 is provided in the display cylinder 92. A float 89 in the gas cylinder 1 and a buoyancy suppressing spring 90 are connected to each other at the lower part of the cylinder.

The rod insertion hole 8 and the display cylinder 92 are arranged as shown in FIG.
As shown in (2), it is provided on the surplus wall 37 near the shut-off valve 12. The excess wall portion 37 is provided with the pressure reducing valve 1 in plan view.
5 is formed near the intersection of the first check valve 16 and the secondary safety valve 19 with respect to the center axis X. In this embodiment, the first check valve 16 is located on the right side of the shut-off valve 12. Is formed in front of. Below the surplus wall 37,
As shown in FIGS. 2 and 6, the leg 30 of the housing 3 is located. The surplus wall portion 37 may be formed immediately before the leg 30 of the housing 3 on the left side of the shut-off valve 12 and before the secondary safety valve 19.

The rod insertion hole 8 is provided in the housing 3
The lower end of the leg 30 has an open end, and the gas introduction passage 11
And extends straight, and the upper part is the first check valve 1
6 and extends to the surplus wall 37.
The display cylinder 92 with the display scale is provided on the surplus wall 37 in parallel with the rod insertion hole 8, and the display scale 92 a is provided to be exposed from the surplus wall 37. I have. These arrangements make the housing 3 itself compact by effectively utilizing the dead space between the shut-off valve 12 and the first check valve 16, and the gas cylinder 1
It is intended that the remaining amount of the liquefied gas G (see FIG. 1) inside can be visually recognized at a glance.

The valve device 2 operates as follows.
At the time of taking out gas from the gas cylinder 1, a gas takeoff fitting 57 composed of a quick joint (quick joint structure) is connected to the gas takeout port 5, and the closing member 24 of the shutoff valve 12 is opened with the operation handle 28. Then, the high-pressure gas in the gas cylinder 1 is supplied to the gas inlet 4 and the gas introduction path 11.
Gas outlet passage 1 through the valve seat 21 and the shut-off valve chamber 22
Flow out to 3.

The high-pressure gas is decompressed by flowing from the opening gap of the pressure-reducing valve member 46 to the pressure-reducing valve seat 42 to the branch chamber 44 through the pressure-reducing valve chamber 43, and the first reverse pressure is applied by the reduced gas pressure. The stop member 62 is connected to the first check spring 6
The gas depressurized to a predetermined value is taken out from the gas outlet 5 while being separated from the first check valve seat 61 against the gas outlet 3. When the backflow gas flows in from the gas outlet 5 for some reason during gas removal, the first check member 62 is brought into close contact with the first check valve seat 61 by the pressure of the flown backflow gas.

If the inside of the branch chamber 44 becomes abnormally high in pressure for some reason, the gas of the abnormal pressure causes the safety valve body 67 to oppose the valve closing spring 68 and cause the safety valve seat 6 to move.
6 and is released from the safety valve chamber 69 to the atmosphere through the atmosphere communication hole 69b. In addition, gas extraction has progressed,
When the residual pressure of the gas cylinder 1 has decreased to the set pressure, the valve closing force of the first check spring 63 overcomes the valve opening force due to the gas pressure in the branch chamber 44, and causes the first check member 62 to move to the first check member 62. (1) Close and contact the check valve seat 61. Thereby, the inside of the gas cylinder 1 is maintained at a predetermined set residual pressure.

When filling the emptied gas cylinder 1 with high-pressure gas, a dedicated gas filling fitting 58 is connected to the gas filling port 6 and the gas is supplied through the gas filling fitting 58 with the closing valve 12 closed. A high pressure gas is supplied from the filling port 6. Then, the high-pressure gas separates the second check member 75 from the second check valve seat 74 and is filled into the gas cylinder 1 through the gas introduction path 11.

Next, a second embodiment of the present invention will be briefly described with reference to FIGS. Here, FIG. 7 is a front view in which a part of the valve device is cut away, and FIG.
9 is a cross-sectional plan view taken along the line FF in FIG. 7, and FIG. 10 is a cross-sectional plan view taken along the line GG in FIG. This second embodiment differs from the first embodiment in the following points. The other points are the same as those of the first embodiment, and members having the same functions are denoted by the same reference numerals, and redundant description is omitted.

In this second embodiment, as shown in FIGS. 7, 8 and 10, the gas filling port 6 has an opening at a front boss 35 protruding from the front of the housing 3 at an intermediate height. The second check valve 17 is formed inside the gas filling port 6 at the back. The primary safety valve 18 is provided on the left boss portion 3 protruding at an intermediate height position on the left side surface of the housing 3.
6 is provided inside. The specific structure of the second check valve 17 and the primary safety valve 18 is the same as that of the first embodiment.

In the second embodiment, as shown in FIG. 9, a pressure reducing valve is provided with respect to a common central axis X of the mounting hole 55 of the first check valve 16 and the mounting hole 54 of the safety valve 19. Fifteen
The central axis Y of the pressure reducing valve 15
The pressure reducing sleeve 40 is protruded into the branch chamber 44, and its central axis Y intersects with the central axis X. This is because the branch chamber 44 serves as a common gas flow path for the pressure reducing valve 15, the first check valve 16, and the secondary safety valve 19, and the three valves 1
5, 16, and 19 are intended to be compactly incorporated in the housing 3 as being closest to each other.

That is, the pressure reducing valve 15 is provided at a position facing the closing valve chamber 22 of the closing valve 12 shown in FIG. Can be Then, the pressure reducing sleeve 40 is mounted so as to face the closing valve chamber 22, and the outer peripheral flange 41 of the pressure reducing sleeve 40 is fixed to the inner end surface of the cover bolt 50 so as not to come off. A gas outlet 13 is formed in the pressure reducing sleeve 40 and faces the closing valve chamber 22. A pressure reducing valve seat 42 is formed at the end of the gas outlet 13, and a pressure reducing operation is performed on the pressure reducing valve seat 42. Small-diameter pressure reducing valve member 46 constituting body 45
The pressure reducing valve chamber 43 is formed around the pressure reducing valve member 46. The first check valve 16
The specific structure of the safety valve 19 is substantially the same as that of the first embodiment.

The above embodiment can be modified as follows. In the above embodiment, the gas introduction path 11 is branched from the gas filling path 14, but the gas introduction path 11 and the gas filling path 14 are replaced with the gas cylinder 1.
May be provided in parallel with the internal space A. The above-mentioned closing valve 12, pressure reducing valve 15, first check valve 1
6. The second check valve 17, the primary safety valve 18, and the secondary safety valve 19 may have different structures from the structures illustrated above. In the case of a compressed gas instead of the exemplified liquefied gas, a pressure gauge is connected to the gas introduction path 11 instead of the float type remaining amount display device 20.

[Brief description of the drawings]

FIG. 1 is a system diagram of a valve device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the valve device according to the first embodiment.

FIG. 3 is a vertical sectional side view taken along line AA in FIG. 2;

FIG. 4 is a cross-sectional plan view taken along line BB in FIG.

FIG. 5 is a vertical sectional view taken along line CC in FIG. 3;

FIG. 6 is a cross-sectional plan view taken along the line DD in FIG. 2;

FIG. 7 is a diagram corresponding to FIG. 2 of a valve device according to a second embodiment of the present invention.

8 is a vertical sectional side view taken along line EE in FIG. 7;

FIG. 9 is a cross-sectional plan view taken along line FF in FIG. 7;

FIG. 10 is a cross-sectional plan view taken along the line GG in FIG. 7;

[Explanation of symbols]

1 ... gas cylinder, 3 ... housing, 5 ... gas outlet, 6
... gas filling port, 8 ... rod insertion hole, 10 ... valve opening prevention means, 11 ... gas introduction path, 12 ... closing valve, 13 ... gas outlet path, 14 ... gas filling path, 15 ... pressure reducing valve, 16 ... first Check valve, 17: second check valve, 19: secondary safety valve, 20: remaining amount display device, 37: excess wall portion, 40: pressure reducing sleeve, 4
4, branch chamber, 54, safety valve mounting hole, 55, check valve mounting hole, 57, gas extraction fitting, 58, special gas filling fitting,
60c: spring receiver of the first check valve, A: internal space of the gas cylinder 1, G: liquefied gas, XY: central axis.

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Mitsumasa Kagomoto 4-6-1 Shimosakabe, Amagasaki-shi, Hyogo F-term (reference) in Neriki Co., Ltd. 3E072 AA01 GA30

Claims (7)

[Claims] 1. A gas outlet in a housing (3) through an internal space (A) of a gas cylinder (1) through a gas introduction path (11), a shutoff valve (12), and a gas outlet path (13) in that order. (5), the internal space (A) communicates with the gas filling port (6) via the gas filling path (14), and the pressure reducing valve (15) and the residual pressure are connected to the gas outlet path (13). A first check valve (16) for holding is provided in order from the upstream side, and a gas outlet fitting (57) can be connected to the gas outlet (5). A second check valve (1) for preventing a flow from the internal space (A) to the gas filling port (6).
7), and a dedicated gas filling fitting (5) having a connection structure different from that of the gas extraction fitting (57) is provided in the gas filling opening (6).
8) A valve device for a gas cylinder, wherein the valve device is configured to be connectable. 2. The gas cylinder valve device according to claim 1, wherein said gas extraction fitting (57) is formed by a quick joint. 3. The gas cylinder valve device according to claim 1, wherein the first branch is provided in a branch chamber (44) downstream of the pressure reducing valve (15).
A check valve mounting hole (55) of the check valve (16) and a safety valve mounting hole (54) of the secondary safety valve (19) are provided facing each other, and a gas outlet (5) is provided from one side of the housing (3). ), The safety valve mounting hole (54) and the branch chamber (4).
4) The valve device for a gas cylinder, wherein the check valve mounting hole (55) is formed on the same central axis (X). 4. The gas cylinder valve device according to claim 3, wherein the safety valve mounting hole (54) and the check valve mounting hole (55).
A central axis (Y) of the pressure reducing valve (15) intersects a different plane with respect to the central axis (X) of the valve device. 5. The valve device for a gas cylinder according to claim 3, wherein the pressure reducing valve (15) is arranged with respect to a center axis (X) of the safety valve mounting hole (54) and the check valve mounting hole (55). The central axis (Y) of the pressure-reducing valve (15) is disposed substantially on the same plane, and a pressure reducing sleeve (40) of the pressure reducing valve (15) is provided in the branch chamber (44) so as to intersect with the central axis (X). A gas cylinder valve device characterized by the above-mentioned. 6. The gas cylinder valve device according to claim 1, wherein the first check valve (1) faces the gas outlet (5).
6), and a valve opening preventing means (10) for preventing the first check member (62) of the first check valve (16) from being opened from the gas outlet (5). A valve device for a gas cylinder, comprising a spring receiver (60c) of the first check valve (16). 7. The gas cylinder valve device according to claim 1, wherein the housing (3) displays the remaining amount of the liquefied gas (G) in the gas cylinder (1). Type remaining amount display device (2
0), and the rod insertion hole (8) of the remaining amount display device (20) is provided with an excess wall portion (37) near the closing valve (12) in plan view.
And a display cylinder (92) of the remaining amount display device (20) is provided in the excess wall portion (37) in parallel with the rod insertion hole (8), and a display scale of the display cylinder (92) is provided. A valve device for a gas cylinder, wherein a portion (92a) is provided so as to be exposed from the surplus wall portion (37).