JPH0416074Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a residual pressure valve for a gas cylinder that prevents air from entering an empty gas cylinder.

<Assumed basic structure> If a gas user leaves the cylinder valve open when the gas cylinder is empty, air, dust, water, etc. will enter the cylinder and contaminate it, making it difficult to use it next time. Reduces the purity of the gas filled in the cylinder.

In order to prevent the purity of this gas from decreasing, a gas cylinder residual pressure valve is used to automatically shut off the gas passage when the internal pressure of the cylinder drops to the residual pressure value, thereby preventing air from entering the cylinder. ing.

In addition, this gas cylinder residual pressure valve is designed to automatically open at the filling gas pressure in order to save time and effort when filling the cylinder with gas.

The basic structure of a residual pressure valve for a gas cylinder that functions as described above is as shown in FIGS. 1 to 4 or 13, for example, as follows.

That is, an inlet 2, a filling valve chamber 3, a take-out valve chamber 4, and an outlet 5 for the gas stored in the gas cylinder 1.
are connected in series on one center line, and the filling valve body 7 is inserted into the filling valve chamber 3 and the take-out valve body 8 is inserted into the take-out valve chamber 4. A valve body stopper 9 is provided between the valve chamber 4, and the filling valve body 7 and the taking out valve body 8 are connected to each valve closing spring 10,1.
1 to the valve body stopper 9 side, and press each valve face 1
By bringing 2 and 13 into contact with each other, each valve body 7,
The air passages 14 and 15 running in the direction of the center line 6 formed at 8 are configured to cut off communication with each other, and when the gas cylinder 1 is filled with gas, the filled gas 16 flows through the outlet 5 and the outlet 5. The valve opening pressure surface 17 of the filling valve body 7 is pressurized through the valve chamber 4 and the air passage 15 of the take-out valve body 8, and the filling valve body 7 is moved against the valve-closing spring 10 to open the take-out valve. The valve is opened by pushing it away from the body 8, and the filling gas 16 further enters the valve opening gap 1.
8. Ventilation passage 14 of the filling valve chamber 3 and the filling valve body 7
When the gas 19 stored in the gas cylinder 1 is taken out of the cylinder, the stored gas 19 passes through the inlet 2, the filling valve chamber 3, and the filling valve body. 7 ventilation passage 1
4, pressurizes the valve opening pressure receiving surface 20 of the take-out valve body 8, pushes the take-out valve body 8 away from the filling valve body 7 against the valve-closing spring 11, and opens the valve, thereby releasing the stored gas. 19 further passes through the valve opening gap 21, the venting passage 15 of the take-out valve chamber 4, and the take-out valve body 8 to the outlet 5.
When the internal pressure of the gas cylinder 1 has decreased to the residual pressure value, the valve closing spring 11 overcomes the internal pressure of the cylinder and brings the take-out valve element 8 into contact with the filling valve element 7 to close the gas cylinder. The valve is configured to block the outflow of the stored gas 19 so that the internal pressure of the cylinder does not fall below the residual pressure value.

<Prior art> As a conventional example that adopts this basic structure,
The present applicant previously proposed what is shown in FIG. 13 (Utility Model Publication No. 51-38065).

That is, in the above basic structure, the take-out valve body 8
is formed with a ventilation passage 15 on the outer periphery of the valve and is configured to be received by a cylindrical stopper 41 when the valve is opened. , an annular ventilation space 42 on the outer periphery of the cylindrical stopper 41 , a vent hole 43 formed in the cylindrical wall of the cylindrical stopper 41 , and a spring gap between the pitches of the valve closing spring 11 to flow out from the outlet 5 . ing.

Further, the valve face 13 of the take-out valve body 8 abuts orthogonally with the cylindrical valve face 12 of the filling valve body 7, and a packing 44 is fixed to the abutting portion.

<Problem that the invention attempts to solve> The above conventional example has the following problems.

B. The extraction valve element 8 forms a ventilation passage 15 on the outer periphery and slides freely against the valve chamber peripheral wall surface 45, and the valve closing spring 11 vibrates when the stored gas 19 flows out. When the outflow pressure and speed of the gas 19 enters a certain range, the take-out valve body 8 causes chattering, which gives a sense of danger to the operator due to the abnormal noise of the chattering, and also causes the take-out valve body 8 to malfunction. Causes wear and tear.

(b) In addition, a cylindrical stopper 41 and an annular ventilation space 42 are provided on the outer periphery of the valve closing spring 11, and the cylindrical stopper 41 is made large in order to sufficiently widen the passage cross-sectional area narrowed by the ventilation hole 43 and the valve closing spring 11. Due to the need to increase the diameter of the residual pressure valve, the overall diameter of the residual pressure valve becomes larger.

Moreover, in order to secure the passage cross-sectional area, a relatively long protruding cylindrical stopper 41 is provided, and in the closed state, the valve face 13 of the take-out valve body 8 and the valve face 12 of the filling valve body 7 protrude. In order to combine
Since the total length of both valves 7 and 8 becomes longer, the overall length of the residual pressure valve becomes longer.

In this way, the entire residual pressure valve is large in diameter and long, and it is difficult to easily incorporate this large residual pressure valve into a relatively small gas outlet mouthpiece of a cylinder valve.

Furthermore, the gasket 44 receives the valve closing force of both the valve bodies 7 and 8 and is subjected to a large surface pressure, so that it is susceptible to fatigue failure at an early stage.

This invention solves all of the above problems A to C,
The purpose is to eliminate the chattering of the valve body, downsize the entire residual pressure valve, and increase the durability of the valve-closing seal.

<Means for solving the problems> In order to achieve the above object, the present invention, as shown in FIGS. 1 to 12, has the following improvements added to the basic structure described above. be.

That is, one of the valve bodies 22 of the take-out valve body 8 and the filling valve body 7 has the ventilation passage 1 in the center of the valve body.
A female valve face 13 is formed on the circumferential surface of the hole of this ventilation passage 15, and a sealing ring 23 is used to seal between the outer circumferential surface of the valve body and the circumferential surface of the valve chamber. The other valve body 24 has a male valve surface 1 protruding from the center of one end surface of the valve body 24.
2 and the female valve surface 13 are sealed with a valve closing seal 25, and the valve closing seal 25 is sealed from the center of the other end surface of the valve body to the one end surface of the valve body. The vent passage 14 is formed to extend through a portion closer to the outer periphery than the valve body 25, and the outer circumferential surface of the valve body and the circumferential surface of the valve chamber are brought into frictional contact via a friction contact body 26. It is something.

<Operation> Next, the operation of the improved part of the present invention will be explained.

(a) When one valve element 22 is pressed by gas pressure to open the valve, this one valve element 22 is in frictional contact with the peripheral surface of the valve chamber through the sealing ring 23, so the occurrence of chattering is prevented. It is.

When the other valve body 24 is operated to open, the other valve body 24 is in frictional contact with the inner circumferential surface of the valve chamber through the frictional contact body 26, so that chattering is prevented from occurring.

(b) The gas flow when the other valve body 24 (structurally corresponding to the conventional take-out valve body 8 in FIG. 13) is opened is explained using FIG. 2 as an example.
Gas 16 enters from the outlet 5 and passes through the extraction valve chamber 4, the ventilation passage 15 of one valve body 22, and the valve opening gap 1.
8. Passes through the filling valve chamber 3 and the air passage 14 of the other valve body 24 and exits from the inlet 2.

In this way, the gas 16 flows directly from the air passage 14 of the other valve body 24 to the inlet 2, thereby allowing the cylindrical stopper 41 of the conventional example shown in FIG.
An annular ventilation space 42 on the outer periphery of the cylindrical stopper 4
1 and the spring gap of the valve closing spring 11 are omitted.

As a result, the cross-sectional area of the passage is no longer narrowed by the ventilation hole 43 and the spring gap in the conventional example, and the cylindrical stopper 41 and the annular ventilation space 42
Since this is omitted, the overall diameter of the residual pressure valve becomes smaller.

Moreover, in the closed state, the female valve surface 13 of one valve body 22 is connected to the male valve surface 1 of the other valve body 24.
2 fits in, the total length of both valves 22 and 24 is shortened, and the conventional cylindrical stopper 4
Since 1 is omitted, the overall length of the residual pressure valve is shortened.

C. In the valve closed state, both the valve bodies 22 and 24 are in direct contact at the contact point 33, and most of the valve closing force of both the valve bodies 22 and 24 is absorbed by this contact point 33,
It does not act so strongly on the valve closing seal 25.

Therefore, the valve-closing seal 25 only comes into sealing contact with both valve surfaces 12 and 13 by its own elastic restoring force, and no unreasonable force is applied thereto.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

Main Embodiment (Figs. 1 to 4) As shown in Fig. 4, the gas cylinder residual pressure valve A of the present invention is incorporated into the gas outlet fitting 32 of the cylinder valve 31 of the gas cylinder 1 by screw fitting. ing. The structure of this residual pressure valve A is as shown in FIG. 1, and the valve opens as shown in FIGS. 2 and 3.

That is, inside the valve box 30 and the valve box lid 34, the inlet 2, filling valve chamber 3, take-out valve chamber 4, and outlet 5 for the gas stored in the gas cylinder 1 are aligned along one center line 6. Connect them by connecting them in series at the top.

The filling valve body 7 is inserted into the filling valve chamber 3, and the take-out valve body 8 is inserted into the take-out valve chamber 4. A valve body stopper 9 made of a ring plate is fixed between the filling valve chamber 3 and the discharging valve chamber 4.

The filling valve body 7 and the taking-out valve body 8 are pressed against the valve body stopper 9 side by the respective valve closing springs 10 and 11,
By bringing the valve surfaces 12 and 13 into contact with each other, the ventilation passages 14 and 15 formed in the valve bodies 7 and 8 and running in the direction of the center line 6 are cut off from communicating with each other.

Next, the structures of the take-out valve body 8 and the filling valve body 7 will be explained. However, since the present invention can be realized even if the structures of both valve bodies 7 and 8 are replaced with each other, for convenience of explanation, both the valve bodies 8 and 7 will be explained. The following description will be made by referring to the valve bodies 7 and 8 as one valve body 22 and the other valve body 24.

In this main embodiment, the structure of one valve body 22 is used for the valve body 8 for taking out, and the structure of the other valve body 24 is used for the valve body 7 for filling.

One valve body 22 has a ventilation passage 1 in the center of the valve body.
A female-shaped valve surface 13 is formed on the circumferential surface of the hole of this ventilation passage 15, and an O-ring 23 is fitted and supported in a circumferential groove 35 formed on the outer circumferential surface of the valve body. It is constructed by sealing between the outer circumferential surface of the body and the inner circumferential surface of the valve chamber with an O-ring 23 fitted and supported.
The female valve face 13 consists of a tapered cylindrical face 27 and a right cylindrical face 28 continuous to its narrow end.

The other valve body 24 is sealed with a valve-closing seal 25 between the valve-closing contact surfaces of the male valve face 12 protruding from the center of one end face of the valve body and the female valve face 13. A ventilation passage 14 is formed to penetrate from the center of the other end surface of the valve body to a portion of the one end surface of the valve body closer to the outer periphery than the valve closing seal 25, and is connected to the outer peripheral surface of the valve body. It is configured to be in frictional contact with the inner circumferential surface of the valve chamber via a frictional contact body 26. Valve closing sealing tool 2
Reference numeral 5 is an O-ring, which is fitted and supported in a circumferential groove formed in the male valve face 12. This valve closing sealing tool 2
5 is in contact with a corner 29 of the joint between the tapered cylindrical surface 27 and the right cylindrical surface 28 of the female valve surface 13. The friction contact body 26 consists of an O-shaped cross section, an X-shaped cross section, or other rubber ring, and has a circumferential groove 36 formed on the outer peripheral surface of the valve body.
It is inset and supported.

In the figure, numerals 17 and 20 are valve opening pressure receiving surfaces, 18,
21 is a valve opening gap, 33 is a contact point of both valve bodies 22 and 24 when the valve is closed, 37 is a handle of the cylinder valve 31, 38 is a valve body of the cylinder valve 31, 39 is a valve chamber, 40 is a gas passage, 57 is a safety valve.

Other Embodiments As various embodiments of the present invention, in addition to the main embodiment described above, it is possible to consider modifications to some of the main embodiments as described in the following sections.

A Valve closing closure 2 supported by male valve face 12
5 is brought into contact only with the right cylindrical surface 28 or only with the tapered cylindrical surface 27 in the valve closed state.

B As shown in FIG. 5, the structure of one of the shapes 22 is used for the filling valve body 7, and the structure of the other valve body 24 is used for the discharge valve body 8.

C As shown in FIG. 6, the friction contact body 26 is formed of a metal wire or a strip spring, and
4, and one end thereof is fixed to the other valve body 24 with a valve closing spring 10.

D As shown in FIG. 7, the valve box lid 34 in FIG.
omitted.

E As shown in FIG. 8, the valve box 30 of the residual pressure valve A is assembled inside the leg threaded portion 52 of the cylinder valve 31.

F As shown in FIG. 9, the valve box 30 of the residual pressure valve A is connected to the gas extraction mouthpiece 32 of the cylinder valve 31 in a protruding manner.

G As shown in FIGS. 10 to 12, the valve box 30 of the residual pressure valve A is supported by the mounting screw 54, and the valve box 30 of the cylinder valve 31 is inserted into the inside of the valve box portion 53 located on the opposite side from the gas outlet cap 32. When assembled, the inlet 2 is communicated with the valve chamber 39 via the inlet passage 55, and the outlet 5 is communicated with the inside of the gas outlet fitting 32 via the outlet passage 56.

<Effects of the invention> Since the present invention is configured and operates as described above, it has the following effects.

B Since the other valve body 24 is in frictional contact with the peripheral surface of the valve chamber through the frictional contact body 26, the occurrence of chattering is prevented, so the abnormal noise of chattering does not give a sense of danger to the operator. In addition, abnormal wear and damage to the other valve body can be prevented.

(b) The residual pressure valve body has a smaller diameter and a shorter length, so it can be significantly downsized.

Accordingly, the residual pressure valve can be easily and easily incorporated into a relatively small gas outlet mouthpiece of a cylinder valve.

C. The valve-closing seal 25 only makes sealing contact with both valve surfaces 12, 13 by its own elastic restoring force, and hardly receives the valve-closing force of both valve bodies 22, 24.
Since no excessive force is applied, fatigue is less likely to occur and durability is improved.

(d) As illustrated in FIG. 1, when the valve-closing seal 25 is configured to abut against the corner 29 of the joint between the tapered cylindrical surface and the right cylindrical surface of the female valve surface in the closed state. increases the contact pressure of the corner,
Sealing power can be increased.

[Brief explanation of the drawing]

1 to 4 show the main embodiment of the present invention,
Figure 1 is a vertical front view, Figure 2 is a vertical front view when gas is being filled into the cylinder, Figure 3 is a vertical front view when gas is being taken out from the cylinder, and Figure 4 is a residual pressure valve inside the cylinder valve. It is a schematic front view incorporating.
5 to 10 respectively show other embodiments of the present invention, in which FIG. 5 is a longitudinal sectional front view, and FIGS. 6 and 7
The figure is a vertical sectional front view of the main part, Figures 8 to 10 are schematic front views of the residual pressure valve assembled to the cylinder valve, and Figure 1
1 is a sectional view taken from FIG. 10, and FIG. 12 is an enlarged sectional view of the FIG. 10 portion. FIG. 13 is a longitudinal sectional front view of a conventional example. 1... Gas cylinder, 2... Inlet, 3... Valve chamber for filling, 4... Valve chamber for taking out, 5... Outlet, 6
...Center line, 7... Valve body for filling, 8... Valve body for taking out, 9... Valve body stopper, 10, 11... Valve closing spring, 12, 13... Valve surface, 14, 15... Ventilation path, 16...Filled gas, 17...Pressure receiving surface for valve opening, 18...Valve opening gap, 19...Stored gas, 20
...Pressure receiving surface for valve opening, 21...Valve opening gap, 22...
One valve body, 23... Sealing ring, 24... Other valve body, 25... Valve closing seal, 26... Friction contact body, 27... Tapered cylindrical surface, 28... Right cylindrical surface , 29...Corner part, 30...Valve box, 31...Cylinder valve, 32...Gas outlet cap, 52...Leg screw part, 53...Valve box part.

Claims (1)

[Scope of claim for utility model registration] 1. Inlet port 2 for gas stored in gas cylinder 1;
The filling valve chamber 3, the taking-out valve chamber 4, and the outlet 5 are connected in series on one center line 6, and the filling valve body 7 is connected to the filling valve chamber 3, and the taking-out valve chamber 4 is connected to the filling valve chamber 3.
The valve body 8 for taking out is inserted into the valve body 8 for filling, and the valve body stopper 9 is provided between the valve chamber 3 for filling and the valve body 4 for taking out, and the valve body 7 for filling and the valve body 8 for taking out are connected to each valve closing spring 10, 11 to the valve body stopper 9 side and the valve surfaces 12 and 13 are brought into contact with each other, so that the air passages 14 and 15 running in the direction of the center line 6 formed in each valve body 7 and 8 are mutually connected. When the gas cylinder 1 is filled with gas, the filling gas 16 passes through the outlet port 5, the take-out valve chamber 4, and the vent passage 15 of the take-out valve body 8, and the gas cylinder 1 is filled with gas. The valve opening pressure receiving surface 17 of 7 is pressurized to push the filling valve body 7 away from the take-out valve body 8 against the valve closing spring 10 to open the valve, and the filling gas 16 further flows into the valve opening gap 18. The gas cylinder 1 is supplied from the inlet 2 through the air passage 14 of the filling valve chamber 3 and the filling valve body 7.
In addition, when the gas 19 stored in the gas cylinder 1 is taken out from the cylinder, the stored gas 19 is taken out through the inlet 2, the filling valve chamber 3, and the ventilation passage 14 of the filling valve body 7. Pressure is applied to the valve-opening pressure receiving surface 20 of the valve body 8 for removal, and the valve-closing spring 1
1, the stored gas 19 is pushed away from the filling valve body 7 to open the valve, and the stored gas 19 further passes through the valve opening gap 21, the take-out valve chamber 4, and the vent passage 15 of the take-out valve body 8, and then exits from the outlet 5. When the gas flows out to the outside and the internal pressure of the gas cylinder 1 drops to the residual pressure value, the valve closing spring 11 overcomes the internal pressure of the cylinder and brings the take-out valve element 8 into contact with the filling valve element 7 to close the valve. In the residual pressure valve for a gas cylinder configured to block the outflow of the stored gas 19 and prevent the internal pressure of the cylinder from decreasing below the residual pressure value, one of the take-out valve body 8 and the filling valve body 7 The body 22 has a ventilation passage 15 in the center of the valve body.
A female-shaped valve surface 13 is formed on the circumferential surface of the hole of this ventilation passage 15, and a sealing ring 2 is inserted between the outer circumferential surface of the valve body and the circumferential surface of the valve chamber.
3, and the other valve body 24 has a valve-closing contact surface between the male valve face 12 protruding from the center of one end face of the valve body and the female valve face 13. The valve is sealed with a valve-closing seal 25, and the ventilation passage 14 is passed through from the center of the other end of the valve body to a portion of the one end of the valve body closer to the outer periphery than the valve-closing seal 25. A residual pressure valve for a gas cylinder, characterized in that the outer circumferential surface of the valve body and the inner circumferential surface of the valve chamber are brought into frictional contact via a frictional contact body 26. 2. The female valve surface 13 is composed of a tapered cylindrical surface 27 and a right cylindrical surface 28 continuous to the narrow diameter end thereof, and the valve closing seal 25 is supported by the male valve surface 12, and the valve is in the closed state. According to claim 1 of the utility model registration, the valve-closing seal 25 is configured to abut a corner 29 of the joint between the tapered cylindrical surface 27 and the right cylindrical surface 28 of the female valve surface 13. Residual pressure valve for gas cylinders. 3. The female valve surface 13 is composed of a tapered cylindrical surface 27 and a right cylindrical surface 28 continuous to the narrow diameter end thereof, and the valve closing seal 25 is supported by the male valve surface 12, and the valve is in the closed state. The residual pressure valve for a gas cylinder according to claim 1, which is a registered utility model, is constructed such that the valve-closing seal 25 comes into contact with the right cylindrical surface 28 of the female valve surface 13. 4 The female valve surface 13 is made of a tapered cylindrical surface 27, and the valve closing seal 25 is connected to the male valve surface 1.
2, and in the valve closed state, the valve closing seal 2
The residual pressure valve for a gas cylinder according to claim 1, wherein the residual pressure valve 5 is configured to abut against the tapered cylindrical surface 27 of the female valve surface 13. 5 The structure of the one valve body 22 is removed from the valve body 8.
The structure of the other valve body 24 is changed to the filling valve body 7.
The residual pressure valve for gas cylinders described in any one of claims 1 to 4 of the utility model registration claims used in . 6 The structure of one valve body 22 is used as the filling valve body 7, and the structure of the other valve body 24 is used as the discharge valve body 8.
The residual pressure valve for gas cylinders described in any one of claims 1 to 4 of the utility model registration claims used in . 7. The residual pressure valve for a gas cylinder according to any one of claims 1 to 6, wherein the frictional contact body 26 is a ring made of a polymeric material. 8. The residual pressure valve for a gas cylinder according to any one of claims 1 to 6, wherein the frictional contact body 26 is made of a metal spring. 9. Any one of claims 1 to 8 of the utility model registration claims, in which the valve box 30 in which the filling valve chamber 3 and the discharging valve chamber 4 are installed is assembled to the cylinder valve 31 of the gas cylinder 1. Residual pressure valve for gas cylinders described in item 1. 10. The residual pressure valve for a gas cylinder according to claim 9, wherein the valve box 30 is incorporated inside a gas outlet cap 32 of a cylinder valve 31. 11 A valve box portion 53 where the valve box 30 is located on the opposite side of the gas outlet mouthpiece 32 of the cylinder valve 31
The residual pressure valve for a gas cylinder as set forth in claim 9 of the utility model registration claim, which is incorporated into the interior of the gas cylinder. 12. The residual pressure valve for a gas cylinder according to claim 9, wherein the valve box 30 is incorporated into the leg threaded portion 52 of the cylinder valve 31. 13. The residual pressure valve for a gas cylinder according to claim 9, wherein the valve box 30 is connected to a gas outlet mouthpiece 32 of a cylinder valve 31 in a protruding manner.