JP2001041397A - Valve device for gas cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the gas filling work. SOLUTION: An outlet nozzle 16 is screwed to the housing main body 3 of a housing 2, a sleeve 17 is screwed allowable to move forward and rearward in the axial core direction to the tube hole 16a of the outlet nozzle 16, and an outlet passage 7 is communicated with the sleeve 17. A check valve seat 13 is provided on the peripheral wall of the starting end 7a of the outlet passage 7, and a check valve chamber 14 and an outlet hole 15 are provided in order inside the sleeve 17. A check valve member 19 inserted in the check valve chamber 14 is pressured to the check valve seat 13 by a check valve spring 20. An engaging tool 24 opposing to the check valve member 19 from the check valve seat 13 side is provided to the sleeve 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for a gas cylinder having a residual pressure holding function and a backflow preventing function.

[0002]

2. Description of the Related Art This type of gas cylinder valve device includes:
Conventionally, the applicant has proposed the above-mentioned Japanese Utility Model No. 56-502.
No. 34 is disclosed. In the above-mentioned prior art, a check valve seat, a check valve chamber, and an outlet hole are sequentially provided in a housing, and a check member inserted into the check valve chamber is connected to the check valve seat by a check spring. The pressure receiving exclusion chamber is recessed and formed in the check member by pressing. When filling the gas cylinder with a new gas, a valve opening tool provided at the tip of the gas filling fitting is airtightly fitted into the pressure receiving exclusion chamber, and the pressure of the filling gas reverses the check member. It is designed to be separated from the stop valve seat.

[0003]

The above prior art is excellent in that the check valve can be forcibly opened by the pressure of the filling gas, but there is room for improvement in the following points. That is,
When the above-mentioned check member has a small diameter, the diameter of the pressure receiving exclusion chamber formed in the check member also becomes small, so that the valve-opening tool of the gas filling fitting is airtightly fitted into the pressure receiving exclusion chamber. This makes the gas filling operation troublesome. An object of the present invention is to facilitate a gas filling operation.

[0004]

In order to achieve the above object, the invention of claim 1 is directed to a valve for a gas cylinder, for example, as shown in FIG. 1 to FIG. 3 or FIG. 4 or FIG. 5 to FIG. The device was configured as follows. A check valve seat 13, a check valve chamber 14, and an outlet hole 15 are sequentially provided in the housing 2, and a check member 19 inserted into the check valve chamber 14 is moved by a check spring 20 to the above check valve seat. In the valve device for a gas cylinder pressed against 13, a cylinder member 17 is provided which is advanced and retracted with respect to the check valve seat 13, and the above-described check valve chamber 14 is formed in the cylinder member 17, and the check valve is provided. The engagement member 24 facing the check member 19 in the valve chamber 14 from the check valve seat 13 side is provided in the cylindrical member 17.

[0005] The invention of claim 1 is, for example, shown in FIG.
As shown in FIG. 3 and FIG. When filling the gas cylinder with new gas, the cylinder member 17
Is switched from the advanced position X in FIG. 2A to the retracted position Y in FIG. 3, and the cylindrical member 17 is retracted from the check valve seat 13.
Then, at the same time, the engagement member 24 provided on the cylindrical member 17 retreats the check member 19, and the check member 19
Is forcibly separated from the check valve seat 13, so that the filling gas may be supplied to the outlet hole 15 in that state. As described above, since the check member can be forcibly opened only by retracting the cylindrical member with respect to the check valve seat, the operation of forcibly opening the valve is facilitated, and the gas filling operation is not troublesome.

Further, as shown in the invention of claim 2, FIG.
(A), when the cylindrical member 17 is mounted in the outlet nozzle 16 of the housing 2 so as to be able to advance and retreat in the axial direction, the cylindrical member can be covered by the outlet nozzle. Can be prevented from being erroneously operated.

As shown in the invention of claim 3, FIG.
), An outlet nozzle 16 is attached to the housing main body 3 of the housing 2 so as to be able to advance and retreat in the axial direction, and the cylindrical member 1 is formed by a peripheral wall of a cylindrical hole 16a of the outlet nozzle 16.
In the case of the configuration 7, since the outlet nozzle can also serve as a cylindrical member, the configuration of the valve device is simplified.

Further, as shown in the invention of claim 4 (see FIG. 2 (A) or FIG. 4), by supporting the cylindrical member 17 on the housing 2 so as to be able to screw in the axial direction, When the cylindrical member 17 is moved forward to the check valve seat 13 and the retracted position Y is separated from the check valve seat 13 as described above.
In the case of switching between (1) and (2), the cylinder member 17 can be advanced and retracted with a reliable and simple structure.

As shown in the invention of claim 5, FIG.
To FIG. 7), the cylindrical member 1 is attached to the housing 2.
When the cylindrical member 17 is slidably supported in the axial direction and the cylindrical member 17 is pressed by the elastic body 52 to the advanced position X approaching the check valve seat 13, the following operation and effect are achieved. That is, at the time of gas filling, the tubular member can be switched to the retracted position by pulling the cylindrical member outward in the axial direction against the elastic body, and by releasing the pulling force, the retracted position can be changed. The cylindrical member can be automatically returned to the advanced position by the elastic force of the elastic body. Therefore, it is possible to prevent the above-mentioned tubular member from being erroneously held at the retracted position after gas filling. In addition, a spring, rubber, or the like can be used as the elastic body.

[0010]

FIG. 1 to FIG. 3 show a first embodiment of the present invention. First, the structure of a gas cylinder valve device to which the present invention is applied will be described with reference to FIGS. FIG. 1 is an elevation view of the valve device. FIG. 2 (A)
FIG. 2 is an enlarged sectional view of a main part of the valve device. FIG.
FIG. 2B is a view taken along line 2B-2B in FIG. 2A.

A leg screw 3a is provided at a lower portion of the housing body 3 of the housing 2 of the valve device 1, and the leg screw 3a is provided.
Is screwed to the neck of a gas cylinder (not shown). In the housing main body 3, an inlet passage 4, a closing valve chamber 6 of a closing valve 5, and an outlet passage 7 are formed in order, and by rotating a spindle 8 screwed to a peripheral wall of the closing valve chamber 6, The closing member 9 provided at the lower part of the spindle 8 serves as the closing valve seat 1.
0 is opened and closed.

A check valve 12 for maintaining a residual pressure is provided in the outlet path 7.
The check valve seat 13 and the check valve chamber 14 of the check valve 12 and the outlet hole 15 are sequentially arranged. That is, the check valve seat 13 is formed on the peripheral wall of the start end portion 7a of the outlet passage 7 at a height in the middle of the housing body 3. An outlet nozzle 16 is screwed tightly at an intermediate height of the housing body 3, and a cylindrical hole 16a of the outlet nozzle 16 is provided.
A sleeve (cylindrical member) 17 is screwed to the axial direction via a screw portion 17a. The check valve chamber 14 is formed in the right portion of the sleeve 17, and the outlet hole 15 is formed in the left end of the sleeve 17. The check member 19 inserted into the check valve chamber 14 is pressed against the check valve seat 13 by the check spring 20.

An intermediate portion of the sleeve 17 in the axial direction and the cylindrical hole 16a of the outlet nozzle 16 are sealed by an O-ring 22, and an annular ring is provided between the left portion of the sleeve 17 and the outlet nozzle 16 of the same. The connection gasket 23 is fitted. Further, the engagement member 24 facing the check member 19 from the check valve seat 13 side is provided with the sleeve 17.
Is provided. Here, the engagement member 24 is formed in a ring shape, and is fitted on the inner peripheral surface of the sleeve 17. The threaded portion 17a of the sleeve 17 is prevented from loosening by bringing the retaining ring 26 attached to the right end of the sleeve 17 into contact with the outer peripheral surface of the peripheral wall of the check valve seat 13. In the left part of the sleeve 17, an operation hole 31 into which the operation tool 30 is fitted in a detent shape is provided.

The valve device 1 operates as follows.
At the time of gas removal, as shown in FIG. 2 (A), the sleeve 17 is screwed to the right by the operating tool 30, and the sleeve 17 is advanced to the advance position X where the sleeve 17 approaches the check valve seat 13. Switch to. Next, as shown in FIG. 1, a gut 35 is externally fitted to the valve device 1, and a gas extraction fitting 37 is hermetically sealed to the connection gasket 23 by a screw thrust of a push bolt 36 screwed to the gut 35. Contact. In this state, when the shut-off valve 5 is opened, the high-pressure gas in the gas cylinder flows out through the shut-off valve chamber 6 to the start end 7a of the outlet path 7, and the check is performed by the pressure of the gas. The member 19 is opened against the check spring 20. As a result, the high-pressure gas is supplied to the check valve seat 1.
3 and through the circumferential groove 19a and the communication hole 19b of the check member 19 and the outlet hole 15 in order, and is taken out to the outside.

If the backflow gas enters the outlet hole 15 for some reason during the gas removal, the above-described check is performed by the pressure of the backflow gas and the urging force of the check spring 20. The member 19 is strongly pressed against the check valve seat 13. As a result, the backflow gas does not enter the gas cylinder.

When the pressure in the gas cylinder is reduced to a set value by the above-described gas removal, the check member 19 is closed and brought into contact with the check valve seat 13 by the urging force of the check spring 20. This prevents the gas from being taken out further and keeps the residual pressure of the gas cylinder at the set pressure.
As a result, even if the closing valve 5 is accidentally left open, it is possible to prevent the atmosphere from entering the gas cylinder.

When a new gas is charged into the gas cylinder whose pressure has decreased to the above set value, as shown in FIG.
The sleeve 17 is screwed to the left by the operation tool 30, and the sleeve 17 is switched to the retracted position Y away from the check valve seat 13. Then, at the same time, the check member 19 retreats to the left by the engagement member 24 provided on the sleeve 17, and the check member 19 is separated from the check valve seat 13.

In this state, the gas extraction fitting 37 described above is used.
The gas filling fitting 40 is brought into air-tight contact with the connection gasket 23 in the same procedure as described above.
To supply the filling gas to the valve device. Then, the filling gas flows through the outlet hole 15 and the communication hole 19b of the check member 19, and the peripheral groove 19a and the inside of the check valve seat 13 in order, and flows into the starting end 7a of the outlet passage 7, and from here, The gas is filled into the gas cylinder through the closing valve chamber 6 and the inlet passage 4 in FIG.

As shown in FIG. 3, when the sleeve 17 is switched to the retracted position Y, the left end surface of the sleeve 17 may be made to protrude more outward than the left end surface of the outlet nozzle 16. preferable. In this case, by visually recognizing the protruding state, it can be determined that the sleeve 17 has been switched to the retracted position Y.

The first embodiment can be modified as follows. As the mechanism for preventing the threaded portion 17a of the sleeve 17 from loosening, instead of the illustrated retaining ring 26, a spring for urging the sleeve 17 to the right with respect to the outlet nozzle 16 may be used. The mechanism for preventing the screw portion 17a from loosening is not essential to the present invention, and may be omitted. The operated portion for screwing the sleeve 17 is provided with an operation hole 31 having a cross-sectional shape as shown (see FIG. 2B).
Instead, the operation hole may have an elliptical or polygonal cross section. Further, the operated portion may be a protrusion provided on an end surface or an outer peripheral surface of the left end of the sleeve 17 instead of the illustrated hole. The mechanism for switching the sleeve 17 between the advanced position X and the retracted position Y is not limited to the illustrated screw-fitting, but may use a ball lock mechanism or the like.

FIGS. 4 and 5 to 7 and 8 show a second embodiment, a third embodiment and a fourth embodiment of the present invention, respectively. In these alternative embodiments,
Members having the same configuration as the first embodiment will be described in principle with the same reference numerals.

FIG. 4 of the second embodiment is a diagram corresponding to FIG. 2A. Exit screw 3 of the housing body 3
The outlet nozzle 16 is screwed into b so as to be able to advance and retreat in the axial direction and to be hermetically sealed. Reference numeral 45 denotes an O-ring, and reference numeral 46 denotes a retaining ring for retaining. The cylindrical hole 1 of the above outlet nozzle 16
The check valve chamber 14 is directly formed in 6a, and the engaging member 24 is fitted in the cylindrical hole 16a. In other words, the above-mentioned sleeve (cylindrical member) 17 is constituted by the peripheral wall of the cylindrical hole 16a of the outlet nozzle 16.

Then, a dedicated jig (not shown) is fitted to the outer peripheral surface of the left half of the outlet nozzle 16, and the outlet nozzle 16 and the sleeve (cylindrical member) 17 are moved to the advanced position X shown in the figure. When the screw is advanced to the left retreat position, the engagement member 24 simultaneously retreats the check member 19 to the left, and the check member 19 separates from the check valve seat 13. The mechanism for moving the outlet nozzle 16 in the axial direction is not limited to the illustrated screw fitting, but may use a ball lock mechanism or the like.

FIGS. 5 to 7 show a third embodiment of the present invention. First, according to FIGS. 5A and 5B,
A structure different from the above embodiment will be described. FIG.
(A) is a diagram of a state in which the gas metal fitting 51 has started to be connected to the sleeve 17. FIG. 5B is an enlarged view of an arrow 5B portion in FIG. 5A.

The sleeve 17 is slidable in the axial direction via an O-ring 22 and is hermetically supported in the cylindrical hole 16a of the outlet nozzle 16. In addition, the above outlet nozzle 16
An extension spring (elastic body) 52 is mounted between the sleeve 17 and the sleeve 17.
Is pressed to the advance position X. On the outer peripheral surface at the left part of the sleeve 17, a locking groove 54 described later is formed over the entire circumference.

The gas filling metal fitting 51 is provided with the sleeve 1
7, an outer cylinder 57 externally fitted to the inner cylinder 56, a pressing spring 58 for urging the outer cylinder 57 to the right, and a rightward spring from the inner cylinder 56. Annular wall 59 protruding
And a through hole 60 provided at a predetermined interval in the circumferential direction in the annular wall 59, a locking ball 61 inserted into the through hole 60, and a sealing tool contacting the left end surface of the sleeve 17. 62. The urging force of the pressing spring 58 is set to a value larger than the urging force of the advance spring 52. In addition, a retaining ring 64 for retaining is mounted on the outer peripheral surface at the right end of the annular wall 59.

The procedure for switching the sleeve 17 at the advance position X in FIG. 5A to the retracted position Y in FIG. 7 through the state shown in FIG. 6A will be described below. First, FIGS. 5A and 5B
As shown in the figure, when the inner cylinder 56 is grasped with one hand and the outer cylinder 57 is grasped with the other hand and the outer cylinder 57 is moved to the left against the pressing spring 58, The relief surface 66 of the outer cylinder 57 faces the ball 61, and the ball 61 becomes free.
7 and the sealing member 62 is brought into contact with the left end surface of the sleeve 17.

Next, when the other hand is released from the outer cylinder 57, the operation is performed as shown in FIG. FIG. 6 (B)
FIG. 7B is an enlarged view of a portion indicated by an arrow 6B in FIG.
That is, the urging force of the pressing spring 58 causes the outer cylinder 5 to move.
7 is moved rightward, whereby the outer cylinder 57 contacts the connection gasket 23 and the outer cylinder 5
7 presses the ball 61 inward, and the ball 61 engages with the locking groove 54 of the sleeve 17.

Then, as shown in FIG. 7, the inner cylinder 56 is moved leftward by the urging force of the pressing spring 58 with respect to the outer cylinder 57 received by the connection gasket 23. The sleeve 17 moves to the left via the ball 61 and switches to the retracted position Y. As a result, the check member 19 moves to the left via the engaging member 24, so that the check member 19 is forcibly separated from the check valve seat 13. In this state, the inner cylinder 5
When a new gas is supplied to the gas filling passage 69 of FIG. 6, the gas is supplied to the check valve chamber 14, the communication hole 19 b and the circumferential groove 19 a of the check member 19, and the inside of the check valve seat 13. The gas is charged into the gas cylinder sequentially through the above-mentioned closing valve chamber (not shown here).

The above-mentioned sleeve 17 is switched from the retracted position Y in FIG. 7 to the advanced position X in FIG. 5A in a procedure substantially opposite to that described above. That is, in the state of FIG.
Is moved to the left against the pressing spring 58, the outer cylinder 5
Since the relief surface 66 of 7 faces the ball 61, the ball 61 becomes free. Therefore, the ball 61
The engagement of the sleeve 17 with the locking groove 54 is released, and the sleeve 17 is automatically switched to the advanced position X by the advanced spring 52. As a result, the check member 19 in the sleeve 17 is in airtight contact with the check valve seat 13 by the check spring 20.

FIG. 8 shows a fourth embodiment of the present invention, in which the gas filling fitting 51 is provided with the following residual gas detecting device 71. More specifically, the gas filling path 6
The check valve chamber 73 and the check valve seat 74 of the check valve 72 for gas filling are arranged in the middle part of the check valve 9 in order, and the check member 75 inserted into the check valve chamber 73 is moved by the check spring Is pressed against the check valve seat 74. A stop valve 79 and a residual gas detector 80 are arranged in order from the upstream side in a detection path 78 connected to the check valve chamber 73. The stop valve 79 closes the valve body 82 screwed by the handle 81 to the stop valve seat 83. In addition, the above-mentioned residual gas detector 8
0 denotes a housing chamber 85 opened to the atmosphere side, a sponge 86 attached to the housing chamber 85, and a sponge 86
It is made up of soapy water impregnated in water.

The procedure for using the residual gas detecting device 71 is as follows.
This will be described with reference to FIG. 8 with reference to FIGS. 5 to 7 described above. When checking the remaining gas, the stop valve 79 is opened. Next, as shown in FIGS. 5 to 7, the gas filling fitting 51 is connected to the sleeve 17 of the valve device 1, and the check member 19 of the check valve 12 for holding the residual pressure is changed to a check valve. Separate from the seat 13. Then, the check valve seat 1
3 flows out to the atmosphere side through the right part of the gas filling path 69 in FIG. 8 and the detection path 78, and the effluent gas is the soapy water in the sponge 86. Foam. As a result, it can be determined that the residual gas is left upstream of the check valve seat 13 (see FIG. 7), and as a result, the sealing function of the seal portion of the check valve 12 for holding the residual pressure is maintained. Can be determined to have been performed.

When a new gas is charged into the gas cylinder in which the residual gas has been confirmed, the stop valve 79 is closed,
Thereafter, new gas is supplied to the gas filling path 69 of the gas filling fitting 51. Then, the supplied gas is subjected to the pressure by the check member 75 of the check valve 72 for gas filling.
To open the check valve 12 and the shut-off valve 5 for maintaining the residual pressure.
(Not shown here) and the gas cylinder is filled. If no residual gas is detected by the soapy water, there is a possibility that the sealing function of the sealing portion of the residual pressure holding check valve 12 is impaired and the inside of the gas cylinder is contaminated by the atmosphere. Judging that there is, first,
The inside of the gas cylinder is cleaned, and then a new gas is filled.

The medium for impregnating the foaming liquid such as the above-mentioned soapy water may be a cotton-like filter, a sintered metal, a sintered ceramic, or the like instead of the sponge 86 described above.
Further, as the residual gas detector 80, a Bourdon tube type micro pressure gauge, a semiconductor type pressure sensor, an odor sensor, or the like can be used instead of a device using a foaming liquid such as soapy water.

Each of the above embodiments can be further modified as follows. A cassette cylinder may be removably attached to the housing 2, and the check valve seat and the sleeve (cylinder member) may be provided in the cassette cylinder. The method of connecting the gas extraction fitting 37 (and the gas filling fitting 40) to the outlet nozzle 16 is not limited to the gut type illustrated, but may be a screw-in type or the like.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is an elevational view of a valve device for a gas cylinder.

FIG. 2A is an enlarged sectional view of a main part of the valve device. FIG. 2 (B) shows 2B-2B in FIG. 2 (A).
It is an arrow view of a line.

FIG. 3 is a diagram showing a state of the valve device at the time of gas filling and corresponding to FIG. 2A.

FIG. 4 shows a second embodiment of the present invention, and FIG.
FIG.

FIG. 5 (A) shows a third embodiment of the present invention, and is a diagram showing a state in which a gas metal fitting has been started to be connected to a tubular member of a valve device. FIG. 5B is an enlarged view of an arrow 5B portion in FIG. 5A.

FIG. 6A shows a state in which the gas filling fitting is connected to the cylindrical member, and is a view corresponding to FIG. 5A. FIG. 6B is an enlarged view of an arrow 6B portion in FIG. 6A.

FIG. 7 is a view showing a state in which the above-mentioned tubular member is switched to a retracted position, corresponding to FIG. 5 (A).

FIG. 8 shows a fourth embodiment of the present invention, and FIG.
FIG.

[Explanation of symbols]

2 ... housing, 3 ... housing body, 13 ... check valve seat, 14 ... check valve chamber, 15 ... outlet hole, 16 ... outlet nozzle, 16a ... cylinder hole, 17 ... cylinder member (sleeve), 19 ... check Member, 20: check spring, 24: engaging tool, 52: elastic body
(Advance spring).

Claims (5)

[Claims] A check valve seat (13), a check valve chamber (14), and an outlet hole (15) are sequentially provided in a housing (2), and a check valve inserted into the check valve chamber (14) is provided. A stop member (19) is used for a check spring (20).
In the valve device for a gas cylinder pressed against the check valve seat (13) by the above, the cylinder member (17) moved forward and backward with respect to the check valve seat (13)
The check valve chamber (14) is provided in the cylindrical member (17).
And the check member (1) in the check valve chamber (14).
A valve device for a gas cylinder, wherein an engagement tool (24) facing the above-mentioned check valve seat (13) with respect to 9) is provided on the above-mentioned cylindrical member (17). 2. The valve device for a gas cylinder according to claim 1, wherein the cylindrical member (17) is mounted in an outlet nozzle (16) of the housing (2) so as to be able to advance and retreat in an axial direction. Characteristic valve device for gas cylinders. 3. The gas cylinder valve device according to claim 1, wherein an outlet nozzle is provided in a housing body (3) of the housing (2).
(16) is mounted so as to be able to advance and retreat in the axial direction.
(17) A valve device for a gas cylinder, comprising: 4. The valve device for a gas cylinder according to claim 1, wherein the cylindrical member (17) is supported by the housing (2) so as to be capable of screwing in the axial direction. The cylindrical member (17)
Switching between a forward position (X) approaching the check valve seat (13) and a retracted position (Y) away from the check valve seat (13). . 5. The gas cylinder valve device according to claim 1, wherein the cylindrical member (17) is slidably supported in the axial direction by the housing (2). The member (17) is made of an elastic body (52).
Advance position (X) approaching the check valve seat (13)
A gas cylinder valve device, characterized in that the valve device is pressed.