JP2001182898A - Valve device for gas cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the filling of a gas having a different type from a regular gas or lower quality. SOLUTION: A gas inlet 6 of a housing 4 is communicated via an inlet passage 11, a shutoff valve chamber 13 of a shutoff valve 15 and an outlet passage 14 in sequence with a takeout port 8, and the inlet passage 11 is communicated via a filling passage 22 to a filling port 10. A first check valve 20 provided in the outlet passage 14 has a check valve seat 20a and a check valve chamber 20b arranged in sequence ranging from the shutoff valve chamber 13 to the takeout port 8. A check member 30 of a second check valve provided in the filling passage 22 prevents the flow from the inlet passage 11 to the filling port 10. The peripheral wall of the takeout port 8 is connected with a gas takeout fitting 21 in a sealed manner. The peripheral wall of the filling port 10 is connected with a dedicated gas filling fitting different from a standardized or marketed pipe joint in a duplicated and sealed manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In general, a gas cylinder valve device of this type is configured such that a gas extraction fitting is connected to an extraction nozzle of the valve device at the time of gas extraction, and a gas filling metal fitting is connected to the same extraction nozzle at the time of gas filling. ing.

[0003]

The above-mentioned conventional gas-filling fitting is excellent in that it can be manufactured easily and inexpensively because it can adopt the same connection structure as the standardized gas extraction fitting.
However, if the conventional gas filling fitting is used, the gas cylinder can be filled with gas at a place other than the designated filling station.Therefore, there is a possibility that a different kind of gas from the regular gas or a low-quality gas may be filled. is there. An object of the present invention is to provide a gas cylinder valve device that can solve the above-mentioned problems.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, as shown in FIGS. 1 to 6, a gas cylinder valve device is constructed as follows.
The internal space S of the gas cylinder 1 communicates with the outlet 8 through the inlet path 11, the closing valve chamber 13 of the shut-off valve 15, and the outlet path 14 in order, and the internal space S passes through the filling path 22 to the filling port 10. A first check valve 20 is provided in communication with the outlet passage 14, and the first check valve 20 is arranged in this order from the closing valve chamber 13 to the outlet 8. And a check valve 20b, a check member 20c inserted into the check valve chamber 20b, and a check spring 20d for closing the check member 20c to the check valve seat 20a. The first check valve 20 is configured to prevent the flow from the outlet 8 to the shut-off valve chamber 13, and the filling path 22 is provided with a second check valve 23. The valve 23 is used to connect the internal space S of the gas cylinder 1 to the filling port 10. The first connecting portion 7 to which the gas outlet 21 is connected in a sealed state is provided on the peripheral wall of the outlet 8, and only the dedicated gas filling member 34 is fitted to the keyed and sealed state. The second connecting portion 9 connected to the charging port 10 is provided on the peripheral wall of the filling port 10.

[0005] Here, the connection in the form of a double key is as follows.
Unlike a standard connection structure such as a standardized pipe joint or a commercially available pipe joint, it means a structure in which only a special fitting specially manufactured for gas filling can be connected.

The first aspect of the present invention has the following operational effects, for example, as shown in FIGS. During the storage of the gas cylinder 1, the closing valve 15 is closed. As a result, the gas in the gas cylinder 1 is removed from the outlet 8.
Outflow to the outside through the shut-off valve 15 is prevented. In addition, the gas in the gas cylinder 1 flows out through the filling port 10 to the outside.
Has been blocked by When taking out the gas from the gas cylinder 1, the gas extraction fitting 21 is connected to the first connection portion 7 in a hermetically sealed manner, and the above-mentioned closing valve 15 is opened. Then
The gas in the gas cylinder 1 is supplied to the inlet passage 11 and the shutoff valve 15.
Through the opening gap of the first check valve 20 and the outlet 8 in order. When filling the emptied gas cylinder 1 with gas, a dedicated gas filling fitting 34 is hermetically connected to the second connection portion 9 in a state where the closing valve 15 is closed, and the gas filling fitting 34 The gas is supplied to the valve device 3. Then, the supplied gas is charged into the gas cylinder 1 through the valve opening gap of the second check valve 23 and the charging path 22 in order.

[0007] At the time of gas filling, only the dedicated gas filling fitting 34 can be connected to the second connecting portion 9 in a key-like manner, so that a standardized pipe joint or a commercially available pipe joint can be used. It is possible to prevent a standard gas-filled metal fitting from being connected to the second connection portion 9. For this reason,
The above-mentioned standard gas filling fitting can prevent different types of gases or gases of different qualities from being accidentally filled in the gas cylinder. Further, at the time of gas filling, the gas connection fitting 21 is mistakenly connected to the first connection portion 7,
When the gas is supplied to the valve device 3 from the take-out fitting 21, the check member 20c is closed to the check valve seat 20a by the pressure of the gas and the urging force of the check spring 20d. Gas can be prevented from filling the gas cylinder 1. In addition, even when the push rod is intentionally made to enter the valve device 3 from the outlet 8, the check member 20c is closed by the check valve seat 20a by the pushed push rod. Also in this case, it is possible to prevent the gas cylinder from being filled with the gas. As described above, it is possible to prevent the gas cylinder from being filled with a different type of gas or a low-quality gas from the regular gas.

According to a second aspect of the present invention, the first
It is preferable to provide a means 91 between the check valve chamber 20b of the check valve 20 and the outlet 8 for preventing the check member 20c from being operated from the outside. According to the second aspect of the present invention, the first check valve can be positively prevented from being forcibly opened, so that the gas cylinder is reliably prevented from being filled with a different kind of gas or a low-quality gas. it can.

According to a third aspect of the present invention, there is provided means 91 for preventing the check member 20c from being operated from outside.
Is constituted by the peripheral wall of the check valve chamber 20b,
Since the above-described prevention means can also be used by the peripheral wall of the check valve chamber, the prevention means can be manufactured at a low cost with a simple configuration.

[0010] As shown in the fourth aspect of the present invention, it is preferable that the structure for connecting the gas filling fitting 34 to the second connecting portion 9 in a key-like manner is configured as follows. The second above
A locking wall 68 projecting radially outward from the supporting portion A of the connecting portion 9 at a predetermined interval in the circumferential direction, and an insertion groove 67 formed between these adjacent locking walls 68. A plurality of convex portions 61 inserted into the insertion groove 67 and the adjacent convex portions 6
1 and 61, a recessed portion 62 for receiving the locking wall 68 is provided, and the locked portion 63 is formed by projecting the convex portion 61 further to the back side than the locking wall 68. And a swivel-allowed groove 64 which is retracted radially outward from the outer peripheral surface of the locking wall 68.

The invention of claim 4 can provide a connection structure completely different from a standard gas-filled metal fitting made of a standardized pipe joint or a commercially available pipe joint. Can be more reliably prevented from being accidentally charged into the gas cylinder. In addition, by combining the outer dimensions or width dimensions or the number of installations of the above-mentioned locking walls, it is possible to select various types of connection shapes, so that the connection structure can be selected according to the type of gas stored in the gas cylinder. This has the effect of being able to sort.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
6 will be described with reference to FIG. First, the structure of the valve device will be described with reference to FIGS. 1 is a vertical sectional view of the valve device, FIG. 2 is a partial sectional view corresponding to the line II-II in FIG. 1, and FIG. 3 is a line III-III in FIG. FIG. The leg 5 of the housing 4 of the valve device 3 is screwed and fixed to the neck 2 of the gas cylinder 1. Its legs 5
A gas inlet 6 is opened downward on the lower surface 5a of the housing 4, and an outlet 8 is opened on an outlet nozzle (first connection portion) 7 protruding from the upper portion of the housing 4. In addition, a filling nozzle (second connection portion) protruding from an intermediate height portion of the housing 4.
At 9, a filling port 10 is opened.

The internal space S of the gas cylinder 1 communicates with the outlet 8 through the gas inlet 6, the inlet passage 11, the closing valve seat 12 of the closing valve 15, the closing valve chamber 13 and the outlet passage 14 in this order. You. The closing member 16 inserted into the above-mentioned closing valve chamber 13 is opened and closed by the above-mentioned closing valve seat 12 by the spindle 17 and the handle wheel 18. Further, a first check valve 20 is mounted on the outlet path 14. The first check valve 2
0 prevents the flow from the outlet 8 to the closing valve chamber 13. The first check valve 20 includes a check valve seat 20a and a check valve chamber 20b arranged in order from the close valve chamber 13 toward the outlet 8.
The check valve 20c includes a check member 20c inserted into the check valve chamber 20b and a check spring 20d for closing the check member 20c to the check valve seat 20a.

More specifically, a sleeve 90 is screwed into the take-out nozzle 7, and a cap 91 is screwed to a deep portion of the sleeve 90. That cap 9
The above-mentioned check valve chamber 20b is formed by the internal space 1. The check spring 20d is mounted between the check member 20c inserted into the check valve chamber 20b and the bottom wall of the cap 91. A communication hole 92 penetrates through the bottom wall of the cap 91, and the check valve chamber 20 b communicates with the outlet 8 through the communication hole 92. The bottom wall of the cap 91, which is the peripheral wall of the check valve chamber 20b, prevents the check member 20c from being operated from the outside. The sleeve 90 has
A screwdriver hole 94 and a channel groove 95 are formed.

Further, the internal space S of the gas cylinder 1
Is a filling path 2 branched from the middle of the entrance path 11
2 through the filling port 10. A second check valve 23 is mounted on the filling path 22. That is, a check valve seat 27 and a check valve chamber 28 are sequentially provided in a straight line with respect to the filling port 10 in a cassette cylinder 25 fixed in a sealing manner to the filling path 22. The check member 30 attached to the check valve chamber 28 is moved by the check spring 31 to the check valve seat 2.
Closed at 7. Only the dedicated gas filling fitting 34 can be connected to the filling nozzle 9 which is the peripheral wall of the filling port 10 in a key-like manner. That is, as will be described later, the filling nozzle 9 is provided with a support portion A for detachably supporting the supported portion B at the tip (the left end in FIG. 2 or 4) of the gas filling fitting 34. . In addition, the valve opening tool 35 of the gas filling fitting 34 is configured to be able to face the check member 30 through the filling port 10. In addition, a safety valve 98 is communicated with the end of the relief path 97 branched from the entrance path 11.

The valve device 3 is used as follows. When gas is stored in the gas cylinder 1, the closing member 16 is brought into close contact with the closing valve seat 12 by the handle wheel 18. In addition, the gas in the internal space S of the gas cylinder 1 is prevented from flowing out to the filling port 10 in the second mode.
It is blocked by a check valve 23. That is, the check member 30 closes and contacts the check valve seat 27 due to the gas pressure in the inlet passage 11 and the elastic pressure of the check spring 31, whereby the gas in the inlet passage 11 is charged. Leakage to the mouth 10 is prevented.

At the time of taking out gas from the gas cylinder 1, the gas take-out fitting 21 is connected to the take-out nozzle 7 which is the first connecting portion.
And the closing member 16 is separated from the closing valve seat 12 by the handle wheel 18. Then, the gas in the internal space S of the gas cylinder 1 flows into the closing valve chamber 13 via the gas inlet 6 and the inlet passage 11, and the gas pressure causes the check member 20c of the first check valve 20 to check. Seat 20a
Away from As a result, the gas passes through the check valve seat 20a, the groove 95 of the sleeve 90, the screwdriver hole 94, and the outlet 8 in this order, and the gas outlet fitting 21
Taken out of

If a different kind of gas enters the outlet 8 for some reason during the gas removal, the pressure of the introduced gas acts on the check valve chamber 20b through the communication hole 92 of the cap 91. Then, the pressure causes the check member 20c to close and contact the check valve seat 20a. Therefore, the invasion gas can be prevented from flowing into the gas cylinder 1. In addition, the gas cylinder 1
When the gas in the chamber becomes almost empty, the pressure in the stop valve chamber 13 decreases, and the check member 20c closes and contacts the check valve seat 20a by the urging force of the check spring 20d. As a result, a predetermined residual pressure is maintained in the gas cylinder 1.

Next, the gas filling fitting 34 will be described with reference to FIGS. FIG. 4 is a longitudinal sectional view showing a state in which a gas filling fitting 34 is connected to the valve device 3.
FIG. 5 is a view showing another cross section of the gas filling fitting 34. FIG. 6 is a view taken along line VI-VI in FIG. 5 described above.

At the center of the casing 38, a metal passage 39 is formed so as to extend right and left. One end of the flow path 39 communicates with the gas filling hole 41 of the casing peripheral surface 40, and the other end of the flow path 39 is opened at the left end face of the casing. A first piston 44 is inserted into a cylinder hole 43 for engagement operation provided in a left portion of the flow channel 39 via a first sealing member 45 made of an O-ring so as to be able to move in a left-right direction to be hermetically sealed. A first driving chamber 46 is provided on the right outside of the first piston 44.
The first drive chamber 46 is provided with a forward spring 47 for resiliently pressing the first piston 44 leftward, and the forward movement of the first piston 44 is prevented by a retaining ring 48. A second sealing member 50 made of an O-ring is fitted to the left end surface of the first piston 44,
The second sealing member 50 is configured to be brought into sealing contact with the cassette cylinder 25 of the valve device 3. Further, as shown in FIG. 5, the outer diameter D for sealing of the first sealing member 45 is set to a value larger than the outer diameter d for sealing of the second sealing member 50. is there.

The left portion of the rod-shaped valve-opening device 35 is inserted into the cylindrical hole 44a of the first piston 44 so as to be movable in the left-right direction. The casing 38 is supported by the O-ring 53 so as to be able to move hermetically in the left-right direction. The valve opening device 35 is operated in the left-right direction by a pneumatic operation device 55 fixed to a right portion of the casing 38. This operating means 55 is configured by inserting a second piston 57 into a cylinder barrel 56 fixed to the right part of the casing 38.
A second drive chamber 58 is formed on the right side of the second piston 57, and a return spring 59 is mounted on the left side of the second piston 57. The second piston 57 is provided with the valve-opening device 35.
The right end of is fixed with a screw.

A supported portion B supported by a support portion A of the valve device 3 is provided on the left side of the peripheral wall of the cylinder hole 43. As shown in FIGS. 2 (and FIG. 3) and FIG. 4, the support portion A is formed at the tip end of the filling nozzle 9 and is provided at a predetermined interval in the circumferential direction and in the radial direction. The four locking walls 68 projecting outward and the adjacent locking walls 68
-It is constituted by the insertion groove 67 formed between 68. A circumferential groove 69 is formed on the left side of the insertion groove 67 and the locking wall 68.
Is formed over the entire circumference. The supported portion B is
Four L-shaped convex portions 61 protruding leftward and four concave portions 62 retreating rightward are provided alternately in the circumferential direction. The L-shaped convex portion 61 includes a locked wall 63 protruding inward in the radial direction, and a turning permissible groove 6 retreating outward in the radial direction.
4 are connected to the left and right.

A cylindrical operating tool 71 for engagement locking is fitted on the casing peripheral surface 40 via two guide pins 72 and a guide groove 73 so as to be slidable in the left-right direction.
From the left side of the operation tool 71, two lock tools 77 are provided so as to protrude to a position where they fit into the casing concave portion 62. The locking member 77 is pressed leftward from the casing 38 by a locking spring 78. The casing concave portion 62 is provided with a retreating groove 79 that allows the lock member 77 to move rightward.

The gas filling fitting 34 is a gas cylinder 1
It is used as follows at the time of gas filling work. Prior to gas filling, the gas filling fitting 34 is connected to the filling nozzle 9 of the gas cylinder 1. That is, as shown in FIG. 4, when the locked wall 63 of the casing 38 is inserted into the insertion groove 67 of the filling nozzle 9 and protrudes into the peripheral groove 69, as shown in a two-dot chain line diagram in FIG. The operation tool 71 and the lock tool 77 are retracted rightward by the locking wall 68. Next, when the casing 38 is turned by about 45 degrees, the locked wall 63 is received from the right side by the locking wall 68, and the locking tool 77 faces the insertion groove 67. At the same time, the locking member 77 protrudes into the insertion groove 67 due to the elastic force of the locking spring 78. Thereby, the turning of the casing 38 is locked, and the gas filling fitting 34 can be prevented from dropping from the filling nozzle 9.

Next, the gas filling operation for the gas cylinder 1 will be described.
This will be mainly described with reference to FIGS. First, compressed air is supplied to the second drive chamber 58 of the operation means 55. Then
The valve-opening member 35 is driven leftward via the second piston 57, and the valve-opening member 35 reversely checks the check member 30 against the residual pressure in the gas cylinder 1 and the elastic pressure of the check spring 31. Valve seat 27
Away from Then, the residual gas in the cylinder 1 is discharged from the gas filling hole 41 via the inlet path 11 and the filling path 22 and the flow path 39 of the gas filling fitting 34. Subsequently, a vacuuming operation is performed from the gas filling hole 41. Then, the impurity gas remaining in the gas cylinder 1 is discharged through the same route as described above.

Thereafter, fresh gas is supplied from the gas filling hole 41 to the flow path 39. Then, as shown in FIG. 5 described above, the receiving pressure corresponding to the sealing outer diameter dimension D of the first sealing member 45 and the receiving pressure corresponding to the sealing outer diameter dimension d of the second sealing member 50. The first piston 44 is pressed leftward by the differential force with respect to the pressure, and the first piston 44
Are in sealing contact with the cassette cylinder 25 via the second sealing member 50. Then, the fresh gas flowing into the flow path 39 is filled into the gas cylinder 1 from the check valve chamber 28 via the inlet path 11.

When the gas filling is completed, the second driving chamber 5
The compressed air is discharged from 8. Then, the valve opening device 35 is retracted by the return spring 59, and the check member 30 is moved to the check spring 31.
To close. In this state, the gas in the flow path 39 escapes from the filling hole 41, and the gas filling fitting 34 is removed from the gas cylinder 1. The above removal operation is performed as follows. First, as shown in a two-dot chain line diagram in FIG.
7. Pull out the lock 77 from 7. In this state, the casing 38 is turned by about 45 degrees, and the locked wall 63 is pulled out to the right through the insertion groove 67.

The above embodiment can be modified as follows. The number of the locking walls 68 and the locked walls 63 is not limited to four, but may be two or more. The filling nozzle 9 of the valve device 3 and a dedicated gas filling fitting 34
Any structure may be used as long as it is connected in a keyed manner, and other structures such as a combination of a fitting pin and a fitting hole may be used instead of the illustrated structure. The second check valve 2
3 only needs to block the flow from the internal space S of the gas cylinder 1 to the filling port 10, and is not limited to the illustrated structure. Means for preventing the check member 20c of the first check valve 20 from being operated from the outside is exemplified by the case in which the check wall is constituted by the peripheral wall of the cap 91, but instead or in addition thereto,
It may be constituted by a protrusion, a rod, or the like protruding inward in the radial direction from the sleeve 90.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a gas cylinder valve device.

FIG. 2 is a partial view in a sectional view corresponding to the line II-II in FIG.

FIG. 3 is a view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view showing a state where a gas filling fitting is connected to the valve device.

FIG. 5 is a view showing another cross section of the gas filling fitting.

FIG. 6 is a view taken along the line VI-VI in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas cylinder, 7 ... 1st connection part (extraction nozzle), 8 ... Outlet, 9 ... 2nd connection part (filling nozzle), 10 ... Filling port, 1
DESCRIPTION OF SYMBOLS 1 ... Inlet path, 13 ... Closing valve chamber, 14 ... Outlet path, 15 ... Closing valve, 20 ... 1st check valve, 20a ... Check valve seat, 20b ...
Check valve chamber, 20c: check member, 20d: check spring, 21
... Gas extraction fitting, 22 ... Filling path, 23 ... Second check valve, 3
4 gas filling fitting, 61 convex part, 62 concave part, 63
... Locked wall, 64 ... Swivel allowable groove, 67 ... Insertion groove, 68 ...
Locking wall, 91: means for preventing operation (cap, peripheral wall of check valve chamber 20b), A: support portion, B: supported portion, S: internal space of gas cylinder 1.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsumasa Kagomoto 4-6-1 Shimosakabe, Amagasaki City, Hyogo Pref. Neriki Co., Ltd. DB02 GG03

Claims (4)

[Claims] 1. An internal space (S) of a gas cylinder (1) is connected to an entrance channel.
(11) Closing valve chamber (13) of closing valve (15) and outlet path (14)
And in turn communicate with the outlet (8), the internal space (S) communicates with the filling port (10) through the filling path (22), and a first check is made to the outlet path (14). A check valve seat (20a) and a check valve, the first check valve (20) being arranged in order from the closing valve chamber (13) to the outlet (8). A check chamber (20b), a check member (20c) inserted into the check valve chamber (20b), and a check spring (20d) for closing the check member (20c) to the check valve seat (20a). ), The first check valve (20) having the above-mentioned outlet.
(8) to prevent the flow to the above-mentioned closing valve chamber (13), a second check valve (23) is provided in the filling path (22), and the second check valve (23) is provided. 23) is configured to prevent a flow from the internal space (S) of the gas cylinder (1) to the filling port (10), and a first connection portion to which the gas extraction fitting (21) is connected in a hermetically sealed manner.
(7) is provided on the peripheral wall of the outlet (8), and a second connecting portion (9) in which only a dedicated gas filling fitting (34) is connected in a key-like and sealed manner is formed. 3. A valve device for a gas cylinder, which is provided on a peripheral wall of (2). 2. The valve device for a gas cylinder according to claim 1, wherein: between the check valve chamber (20b) of the first check valve (20) and the outlet (8); A valve device for a gas cylinder, comprising means (91) for preventing the check member (20c) from being operated from the outside. 3. The valve device for a gas cylinder according to claim 2, wherein the means (91) for preventing operation is connected to the check valve chamber (2).
A valve device for a gas cylinder, comprising a peripheral wall of 0b). 4. The gas cylinder valve device according to claim 1, wherein the gas filling fitting (34) is keyed to the second connecting portion (9) in a key-like manner. A locking wall (68) protruding radially outward at a predetermined interval in the circumferential direction on the support portion (A) of the second connection portion (9);
An insertion groove formed between these adjacent locking walls (68) (68)
(67), a plurality of convex portions (61) inserted into the insertion groove (67) in the supported portion (B) of the gas filling metal fitting (34), and adjacent convex portions (61). ) (61) formed above the locking wall
A recessed portion (62) for receiving the (68) is provided, and the above-mentioned protruding portion (61) is locked with a locked wall (63) protruding more deeply than the locking wall (68). A valve device for a gas cylinder, characterized in that the valve device is constituted by a swirl permitting groove (64) which is retracted radially outward from an outer peripheral surface of a locking wall (68).