JPS5821958Y2 - Cylinder valve with cassette type automatic residual pressure valve - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cylinder valve that incorporates a residual pressure valve that prevents outside air from entering an empty cylinder.It has a structure that does not pose any problem when installing pressure reducing valves or joints, etc. The purpose of the present invention is to provide a simple and easy to find faulty part, replacement and repair, and to be able to accurately and easily fill gas into a cylinder.

Conventional pulp cylinders consisted of only a main valve, so if the main valve was left open after the cylinder was emptied, impurities such as outside air, dust, water, or oil could enter the cylinder. However, this contaminates the newly filled gas and causes a decrease in the purity of the gas.

In order to eliminate this drop in gas purity, it is necessary to wash the empty cylinders collected from customers with water, dry them, and then perform gas replacement or vacuuming to expel impure gas (mixed air, etc.) from inside the cylinders. The disadvantage is that the work requires a lot of time, effort, and equipment.

In order to eliminate these drawbacks, the present inventor has developed a system in which a residual pressure valve is installed inside the gas outlet hole of the cylinder pulp, which automatically shuts off the gas outlet passage when the pressure inside the cylinder drops below a certain value. Patent application 1977-8947) was first proposed.

(See 4th wick A) However, since the residual pressure valve is installed in the gas outlet hole, this type has the following drawbacks.

(a) Since the depth L of the gas outlet hole H becomes shallower due to the inclusion of the residual pressure valve R, the screw fitting dimension of equipment such as a pressure reducer connected to the gas outlet hole H becomes shorter. If the connection strength is insufficient, existing equipment cannot be used.

In order to solve this problem, if the protrusion amount K of the gas outlet hole H is increased and the depth L of the gas outlet hole H is increased, the safety cap that is screwed onto the neck of the cylinder body and covers the cylinder pulp will protrude too much. If it hits the gas outlet tube G, it will not be able to be screwed into the cylinder body.

(b) Since the residual pressure valve is installed inside the gas outlet hole H, which is restricted by connected equipment, etc., the outer diameter of the valve should be set to the inner diameter d or less of the gas outlet hole H. A sufficient cross-sectional area of the flow path must also be secured.

This may result in unreasonable design of the residual pressure valve or inability to obtain a sufficient gas flow rate.

←→ Since the peripheral wall portion of the gas outlet hole H constitutes the valve box of the residual pressure valve, the residual pressure valve body must be assembled within the narrow gas outlet hole H, and the assembly work is troublesome.

We proposed a housing in which a residual pressure valve was installed in combination with the main valve in the main valve chamber of the pulp cylinder body (Japanese Patent Laid-Open No. 49-914851).

(See FIG. 4B) However, in this case, since the residual pressure valve is installed in the main valve chamber in combination with the main valve, there are the following drawbacks.

B) Since the main valve V and the residual pressure valve R are organically combined within the narrow main valve chamber, the structures of both valves become complicated, making assembly difficult and increasing manufacturing costs.

(e) When a valve malfunctions, it may become unclear which of the main valve V or the residual pressure valve R has failed, making it difficult to accurately locate the malfunctioning location, and the main valve V or residual pressure valve R
Since they cannot be separated and both must be disassembled and reassembled at the same time, repair becomes difficult.

Even when repairing a broken or malfunctioning residual pressure valve, all the gas in the cylinder must be released, so there is a loss due to gas release, or it takes a lot of effort to replace the gas, and when both valves are disassembled. In addition, since outside air flows into the cylinder as impure gas, operations such as evacuation and gas replacement are required when refilling.

Furthermore, both of the above-mentioned examples have the disadvantage that the residual pressure valve must be opened during refilling, making the refilling process troublesome.

The present invention was proposed in view of these points, and takes advantage of the respective advantages of the above two conventional examples, and
The purpose is to eliminate this drawback, and as a means to achieve this purpose, a residual pressure valve chamber is formed in the middle of the gas passage connecting the main valve chamber and the gas outlet hole in the valve box. A cassette type automatic residual pressure valve is removably inserted and fixed into the residual pressure valve chamber with an opening on a side different from the side where the gas outlet hole is formed, and the cassette type automatic residual pressure valve is installed on the inlet side and the outlet side to maintain a pressure higher than the set pressure. It is characterized in that the valve opens only when there is pressure, allowing gas to flow out or flow in.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 is a vertical cross-sectional front view of cylinder pulp, Figure 2 is Figure 1A
-A sectional view.

In the figure, reference numeral 1 denotes a valve box, and a male screw 3 fixed to the cylinder 2 is formed at the lower part of the circumferential surface, a gas inlet hole 4 is opened at the lower end surface, and a main valve chamber 5 is formed in the upper half of the box. The residual pressure valve chamber 6 is formed in the right-hand side of the intermediate height with an upward opening, and the gas outlet hole γ is formed in the left-hand side of the intermediate height with a left-facing opening. A female screw 8 for fixing a pressure reducing valve, etc. is formed on the inner circumferential surface of the hole I, and a safety valve chamber 9 is formed in a rearward opening shape at the intermediate height of the female screw 8, and this safety valve chamber 9 is screwed into this from behind. The safety valve 10 is closed IL.

A main valve chamber 5 is connected to the gas port 4 through an inlet hole 11, a residual pressure valve chamber 6 is connected to the main valve chamber 5 through an intermediate hole 12, and a gas outlet hole I is connected to the residual pressure valve chamber 6 through an outlet hole 13. , the gas in the cylinder 2 passes through a gas port 4, a main valve chamber 5, a residual pressure valve chamber 6, and a gas outlet I in order to flow out to the outside.

The safety valve chamber 9 is connected to the inlet hole 11 through an outlet hole 14.

A main valve 15 is installed inside the main valve chamber 5;
The valve stem 11 is pivotally supported by a retainer nut 16 that is screwed to close the upper part of the valve, and when the handle 18 is rotated to the left or right, the main valve 15 is rotated in the same direction via the valve stem 1T. is,
This main valve 15 is guided by the screw fitting part 19 and moves up and down,
The valve seat 20 at the inlet of the main valve chamber 5 is configured to open and close.

A cassette type automatic residual pressure valve 21 is removably inserted and fixed into the residual pressure valve chamber 6 by screw fitting 22 .

This cassette type automatic residual pressure valve 21 is constructed as shown in FIG.

That is, the cassette indicated by the reference numeral 23 has a cylindrical main body 2 with a bottom.
4 and a cylindrical lid 25 that is fitted and fixed into the opening of the cylinder.

A large-diameter inlet chamber 26 is formed within the cassette body 24, and a small-diameter exit chamber 2T is formed within the cassette cylinder lid 25.
A valve seat 28 is provided to protrude toward the inlet chamber 26 from the outer peripheral wall surface of the communication port between the inlet chamber 26 and the outlet chamber 27 .

An inflow valve body 29 is inserted into the inlet chamber 26 so as to be able to move forward and backward, and this inflow valve body 29 is pushed and biased to the left by a valve closing spring 30, so that the end face of the gasket 31 fixed to its left end face is pressed. The valve surface 32 of the outer peripheral portion is in closing contact with the valve seat 28.

An introduction passage 33 is formed on the outer periphery of the inflow valve body 29, and an outlet hole 34 is transparently provided in the center of the inlet passage 33. The introduction passage 33Fi communicates with the intermediate hole 12 and the inlet chamber 26. The outlet chamber 21 is communicated with the outlet chamber 21.

An outflow valve body 35 is inserted into the outlet chamber 27 so as to be movable forwards and backwards, and this outflow valve body 35 is pressed to the right by a valve closing spring 36, so that a valve protruding from the outer periphery of the left end face of the outflow valve body 35 is inserted. Side 3
1 is in closing contact with a valve surface 38 on the inner peripheral spine of the end face of the gasket 31 of the inflow valve body 29.

Next, its effect will be explained.

When the main valve 15 is opened by operating the handle 18 from the state where the cylinder 2 is filled with gas, the gas in the cylinder 2 flows into the residual pressure valve chamber 6 via the main valve chamber 5, and the gas in the cylinder 2 flows into the residual pressure valve chamber 6 through the inlet passage 33 and the inlet chamber 2.
6 and the outlet passage 34, the outflow valve body 35 is opened against the valve closing spring 36, and the water flows out from the outlet hole 7 via the outlet hole 13.

When the internal pressure of cylinder 2 drops to the set residual pressure that is close to empty,
The opening force of the gas flowing from the inlet chamber 26 to the outlet chamber 2T of the residual pressure valve 21 becomes weaker than the closing force of the spring 36, and the valve 2
When the set residual pressure remains in the valve 11, the outflow valve body 35 is automatically closed by its spring 36.

Therefore, even if the main valve 15 is left open, the residual pressure valve 21 is closed to ensure that external impurities such as outside air are prevented from entering the cylinder 2.

When collecting the empty cylinder 2 and refilling it with gas, connect the gas filling port of the gas filling device to the gas outlet hole 7, open the main valve 15, and direct the filling gas toward the cylinder 2. to pump.

Then, the filling gas flows from the outlet hole T through the outlet hole 13 into the outlet chamber 27, pushes the inflow valve body 29 open against the valve closing spring 30, directly flows into the inlet chamber 26, and flows into the intermediate hole 12, It passes through the main valve chamber 5 and the inlet hole 11 in order, flows into the cylinder 2, and is filled.

When this gas filling is completed, the main valve 15 is closed, and the gas outlet hole I
When the gas filling port is removed, both the inlet valve body 29 and the outlet valve body 35 are closed by respective springs 30,36.

As explained above in the embodiments, the present invention forms the residual pressure valve chamber in the valve box separately from the outlet hole and the main valve chamber, and connects the gas inlet opening at the bottom of the valve box and the lower part of the main valve chamber to the inlet. The main valve chamber and the residual pressure valve chamber are connected through a hole, the main valve chamber and the residual pressure valve chamber are connected through an intermediate hole, the residual pressure valve chamber and a gas outlet hole opened on the circumferential surface of the valve box are connected through an outlet hole, and the main valve is connected to the main valve chamber. A valve seat is formed at the end of the main valve chamber on the gas inlet hole side, and the residual pressure valve chamber is opened on a side different from the side where the gas outlet hole is formed in the valve box. An automatic residual pressure valve is removably inserted and fixed, and this cassette type automatic residual pressure valve is formed by a cassette, an inflow valve body, an outflow valve body, and each spring that biases each valve body to close. An inlet chamber and a small-diameter outlet chamber are formed, and an inflow valve seat is formed on the peripheral wall surface of the communication part of the compartment, and the inflow valve body inserted into the inlet chamber is brought into closing contact with the inflow valve seat with a spring, and the outlet is closed. The outflow valve inserted into the chamber is brought into close contact with the outflow valve seat provided on the end face of the inflow valve on the outlet chamber side using a spring, and the residual pressure inside the cylinder body is reduced by the spring pressure of the spring that biases the outflow valve into closing. Since the inlet chamber is set and communicated with the intermediate hole, the following effects are achieved.

B. Due to the presence of the residual pressure valve, when the internal pressure of the cylinder drops below the set residual pressure, the residual pressure pulses and closes, and the main valve is opened. It is possible to reliably prevent impurities from entering the cylinder, and it is possible to prevent a decrease in gas purity and contamination within the cylinder.

Since the residual pressure valve is installed in a residual pressure valve chamber formed in a location different from the gas outlet hole of the valve box, unlike conventional valves that are installed inside the gas outlet hole, the depth dimension of the gas outlet hole must be made sufficiently large. It can be taken deeply.

As a result, the screw fitting dimensions of the pressure reducing valve connected to the gas outlet hole can be made sufficiently large to ensure a strong connection, while the amount of protrusion of the gas outlet hole forming part can be reduced. Cylinder pulp can be protected with conventionally used cylinder pulp covers.

Therefore, it can be easily applied even to a cylinder body that is not equipped with a cylinder pulp equipped with a residual pressure valve.

...Also, since the residual pressure valve chamber is formed between the main valve chamber and the gas outlet hole in the valve box, its size can be freely formed, and the residual pressure valve is formed between the main valve chamber and the gas outlet hole. The size of the sheath gas outlet hole can be freely formed without being restricted by the size.

As a result, the design of the residual pressure valve is not unreasonable, and its operating accuracy can be maintained at a high level, and the cross-sectional area of the gas flow path can also be formed sufficiently large, so that the gas flow resistance can be reduced.

2.Repairs of the residual pressure valve can be carried out with the main valve closed and gas outflow from the cylinder stopped, which eliminates the loss caused by gas discharge inside the cylinder and the large amount of effort required to replace the gas. Moreover, it also prevents outside air from entering the cylinder.

E. A pulp cylinder with a malfunctioning residual pressure valve can be repaired easily and quickly by anyone, anytime, anywhere, simply by replacing the malfunctioning residual pressure valve with a new residual pressure valve in a cassette type.

When refilling an empty cylinder, simply press the filling gas through the gas outlet hole, and the inflow valve body of the cassette-type residual pressure valve will automatically close against the valve closing spring due to the gas pressure. Since the valve opens immediately, the gas can be filled without having to open the residual pressure valve, which is required in conventional pulp with a built-in residual pressure valve.

Moreover, when gas filling is completed, the inflow valve body is automatically closed by the valve closing spring by closing the main valve, so the closing operation of the inflow valve body can be omitted, and the inflow valve body It is possible to prevent the residual pressure valve from inoperating due to forgetting to close the valve.

Thereby, gas refilling work can be easily performed.

G. Since there is no need for the inflow and outflow valve bodies to slide airtight with O-rings on the peripheral walls of the inlet and outlet chambers, there is no sliding resistance due to O-rings, and both valve bodies can operate at high speed and with high precision. Operate.

Moreover, the vaporized gas of lubricating oil necessary for airtight sliding of the O-ring does not mix with the gas passing through the residual pressure valve and contaminate the gas.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is a vertical front view, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is an enlarged view of part B in FIG. 1. FIGS. 4A and 4B are longitudinal cross-sectional views of essential parts of the previously proposed structure. 1...Valve box, 2...--Cylinder, 4...
...Gas inlet, 5...Main valve chamber, 6...
・Residual pressure valve chamber, 1...Gas outlet hole, 11...
...Inlet hole, 12...Middle hole, 13...
・Outlet hole, 15...Main valve, 20...Valve seat, 21...Automatic residual pressure valve, 23...Cassette, 26...・Inlet chamber, 2γ... Outlet chamber, 28... Inflow valve seat, 29... Inflow valve body, 30, 36... Valve closing spring, 35 ...
...Outflow valve body, 38...Outflow valve seat.

Claims (1)

[Scope of utility model registration request] A gas port 4, a main valve chamber 5, a residual pressure valve chamber 6, and a gas outlet hole I are formed in a valve box 1 that is screwed onto the neck of a cylinder 2, respectively,
The gas man lower opening at the bottom of the valve box 1 and the lower part of the main valve chamber 5 are connected by an inlet hole 11, the main valve chamber 5 and the residual pressure valve chamber 6 are connected by an intermediate hole 12, and the residual pressure valve chamber 6 and the residual pressure valve chamber 6 are connected by an intermediate hole 12. The main valve 15 is connected to the gas outlet hole opened on the circumferential surface of the valve box through the outlet hole 13, and the main valve 15 is connected to the main valve chamber 5.
A valve seat 20 is formed at the end of the main valve chamber 5 on the gas port 11 side, and the residual pressure valve chamber 6 is opened on a side surface of the valve box 1 that is different from the side surface on which the gas outlet hole 1 is formed. With,
A cassette type automatic residual pressure valve 21 is removably inserted and fixed into this opening, and the cassette type automatic residual pressure valve 21 is inserted into the cassette 23.
The cassette 23 has a large diameter inlet chamber 26 and a small diameter outlet chamber 27 inside the cassette 23. At the same time, an inflow valve seat 28 is formed on the peripheral wall surface of the communication portion of the compartments 26 and 27, and the inflow valve body 29 inserted into the inlet chamber 26 is brought into close contact with the inflow valve seat 28 by a spring 30, and the outlet The spring 36 brings the outflow valve body 35 inserted into the chamber 27 into close contact with the outflow valve seat 38 provided on the end surface of the outlet chamber 2T side of the inflow valve body 29, and the spring pressure of the spring 36 biases the outflow valve body 35 to close. Set the residual pressure inside the cylinder body with
A cylinder valve with a cassette type automatic residual pressure valve, which is characterized by being in communication with the cassette type automatic residual pressure valve.