JPH059597Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (Field of Industrial Application) The present invention relates to a leak prevention mechanism for a valve device of a refillable gas cylinder.

(Prior Art) There are generally two types of refillable valve structures. One type has a handle and by turning the handle, the valve stem is pressed against the valve seat for a seal.The other type uses internal pressure and a spring to press the valve stem against the valve seat.

(Problems to be solved by the invention) The former sealing method is reliable, but the overall shape is large and expensive. The latter is easy to operate and inexpensive, but since the valve part is not fixed with screws or the like, there is a possibility of gas leakage during transportation. Additionally, if gas from a cartridge is collected with the valve open after use, moisture and other dust may enter the cartridge, causing it to rust or contain foreign matter, thus shortening the cartridge's service life. Sometimes I put it away.

The present invention solves the problems associated with the latter case.

B. Structure of the invention (means for solving problems) The leakage prevention mechanism of the valve device for a refillable cylinder according to the invention includes a main body, a cylinder, a valve, and a lid.

The main body has a gas passage passing through it, a cylinder attachment port provided at one end of the gas passage, and an opening provided at the other end of the gas passage.

The cylinder has a spring seat on the inner wall surface of the opening.

The valve has a valve seat and a valve body. This valve seat is formed so that a part of the main body projects into the cylinder mounting opening in a cylindrical shape surrounding the gas passage. In addition, the valve body is provided at one end of the valve rod, and is resiliently supported by a coil spring interposed between its own spring receiving part and the spring seat of the cylinder mentioned above, and presses against the valve seat, allowing the valve rod to move freely in the gas passage. It passes through and the screw at the other end is inserted into the opening.
The valve rod is pushed in when a pressure gas supply source or extraction means is attached to the opening, thereby separating the valve body from the valve seat.

The lid has a screw on one side that engages with the screw of the valve stem, and when the screw is inserted into the opening, it comes into contact with one end surface of the main body and is rotatable.

The screws on the lid are screwed together with the screws on the valve rod, and the lid is rotated to increase the pressure contact between the valve body and the valve seat.

(Operation) Screw the lid screw into the screw at the end of the valve stem. One surface of the lid contacts the opening side end surface of the main body and rotates in a fixed position, so that the valve rod is gradually drawn toward the lid and the valve body is brought into close contact with the valve seat. Since coil spring pressure and gas pressure are applied to the valve rod, it does not rotate together with the lid. The cylinder is transported in this state, but since the valve body and valve seat are in close contact, no gas leakage occurs even if vibrations are applied. When using gas, remove this lid and connect a normal extraction means to this opening.The extraction means pushes the valve rod against the coil spring and releases the valve body from the valve seat, so that the gas inside can be released. leak. When the cylinder is empty, screwing the lid onto the valve stem prevents moisture and dust from entering the cylinder. When filling with gas, a pressure gas supply source is connected to this opening, and the valve rod is similarly pushed in to fill the cylinder with pressure gas.

(Embodiment) Reference numeral 1 denotes a valve device for a refillable cylinder, which includes a main body 2, a cylinder 3, a valve 1', and a lid 15.

The main body 2 has a mounting opening 4 for a cylinder 3 at one end on the axis, and an opening 5 at the other end. Both ports 4 and 5 communicate through a gas passage 6. The cylinder 3 is provided with a spring seat 12 on the inner wall surface of the opening 3'.

The valve 1' has a valve seat 7 and a valve body 9. Valve seat 7
A part of the main body 2 is formed so as to surround the gas passage 6 and protrude toward the attachment port 4 side in a cylindrical shape. Further, the valve body 9 is provided at one end of the valve rod 8 and is supported by a coil spring 13 interposed between a spring receiving portion 11 of the valve body 9 and a spring seat 12 of the cylinder 3. Then, with the valve rod 8 inserted into the gas passage 6 and the cylinder 3 attached to the mounting port 4, the gasket 10 and the valve seat 7 provided on the valve body 9 facing the valve seat 7 bend the coil spring 13. Press it.

The other end of the valve rod 8 projects into the opening 5 with the cylinder 3 attached to the mounting port 4, and a screw 14 is provided at the other end.

The lid 15 is provided with a screw 17 on one surface 16 that engages with the screw 14 of the valve rod 8, and with the screw 17 inserted into the opening 5, the lid 15 is in contact with the end surface 18 of the main body 2 on the opening 5 side. Can be rotated.

Therefore, when the screw 17 of this lid 15 is screwed into the screw 14 of the valve rod 8 and the lid 15 is rotated, after the one surface 16 of the lid 15 comes into contact with the end surface 18 on the opening 5 side, this lid 15 rotates in a fixed position, attracts the valve rod 8, and causes the valve body 9 to be firmly seated on the valve seat 7. When the cylinder 3 is transported in this state, the valve seat 7 and the valve body 9 will not loosen even if subjected to vibrations or shocks, and no gas leakage will occur.

In the drawing, 21 is a connecting O-ring accommodated in the stepped portion 22 of the gas passage 6, 23 is an O-ring holder, and 2
4 is a gasket for cylinder 3 inserted into installation port 4, 2
5 is a safety valve connected to the installation port 4, 26 is a cylinder 3
A mounting screw 28 which is screwed into the neck screw 27 is a set screw that prevents the cylinder 3 from falling off.

The cylinder 3 is attached to the valve device 1 using the illustrated mechanism. Although the installation order is arbitrary, the valve body 9 is pressed against the valve seat 7 by the coil spring 13 in the installed state,
The screw 14 of the valve rod 8 is made to come out into the opening 5. When a pressure gas supply source is connected to the opening 5, a push rod or the like provided on the supply source side presses down the valve rod 8 against the coil spring 13. Then, when the valve element 9 is separated from the valve seat 7 and its own valve is opened automatically or manually, the cylinder 3 is filled with pressure gas. When the supply source is removed from the opening 5 after filling, the valve body 9 is returned by the coil spring 13 and the gas pressure and seats on the valve seat 7, thereby blocking gas outflow. When using the gas in the cylinder 3, a take-out means may be connected to the opening 5 and the valve rod 8 may be pushed in.

When transporting, screw the screw 17 of the lid 15 onto the screw 14 of the valve rod 8, and tighten the valve body 9 to the valve seat 7 with one surface 16 of the lid 15 in contact with the end surface 18 of the opening 5 of the main body 2. Turn the screw until it seats. The valve body 9 and valve seat 7 are now in close contact with each other, and there is no gap even when subjected to vibrations or shocks, preventing gas leakage when the cylinder 3 is filled with high-pressure gas or from the outside when the cylinder 3 is empty. It can completely prevent the intrusion of moisture, dust, etc.

Providing mounting screws 31 for the gas extraction means or pressurized gas supply source on the inner wall surface of the opening 5 makes it easier to connect these extraction means and the supply source, and when the connection is completed, the valve rod 8 can be pushed in. The gas passage 6 can be kept open.

By protruding from one surface 16 of the lid 15 a rotary positioning boss 32 that fits loosely into the inner diameter of the opening 5, the position of the lid 15 relative to the main body 2 is determined, making it easier to screw together the screw 14 of the valve rod 8. .

By forming the cylindrical hem 33 for protecting the neck of the cylinder 3 on the outer periphery of the lid 15, the neck can be prevented from being damaged by external force.

C. Effects of the invention According to the invention, the valve body and valve seat can be brought into close contact not only by the spring force but also by the tightening force of the screw between the lid and the valve rod, thereby preventing gas leakage from the cylinder. , it is possible to effectively prevent foreign matter from entering the cylinder from the outside.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a specific example of the leakage prevention mechanism according to the present invention, and FIG. 2 is a plan view thereof. 1... Valve device, 1'... Valve, 2... Main body, 3...
...Cylinder, 3'...Opening, 4...Installation port, 5...
...Opening, 6...Gas passage, 7...Valve seat, 8...Valve rod, 9...Valve body, 11...Spring receiver, 12...
Spring seat, 13...Coil spring, 14...Screw, 1
5...Lid, 16...One side, 17...Screw, 18...
... end face, 31 ... mounting screw, 32 ... boss for determining rotational position, 33 ... cylindrical hem for neck protection.

Claims (1)

[Claims for Utility Model Registration] (1) It has a main body 2, a cylinder 3, a valve 1', and a lid 15, and the main body 2 has a gas passage 6 passing through it, and a gas passage 6 provided at one end of the gas passage. The cylinder 3 has a mounting port 4 for the cylinder 3, and an opening 5 provided at the other end of the gas passage, and the cylinder 3 has a spring seat 1 on the inner wall surface of the opening 3'.
2, the valve 1' has a valve seat 7 and a valve body 9, the valve seat 7
A part of the main body 2 is formed in a cylindrical shape that surrounds the gas passage 6 and protrudes into the installation opening 4 of the cylinder, and the valve body 9 is provided at one end of the valve rod 8 and has its own spring. It is elastically supported by a coil spring 13 interposed between the receiving part 11 and the spring seat 12 of the cylinder 3 and comes into pressure contact with the valve seat 7, and the valve rod 8 movably passes through the gas passage 6 to form the other end. screw 14
enters the opening 5 and is pushed in to separate the valve body 9 from the valve seat 7 when a pressure gas supply source or extraction means is attached to this opening, and the lid 15 is inserted into the valve rod 8. It is provided with a screw 17 on one side that engages with the screw 14 of the valve, and is rotatable by contacting one end surface of the main body 2 with the screw 14 inserted into the opening 3', and the screw 17 of the lid 15 is connected to the valve. Leakage of a valve device for a refillable cylinder, characterized in that the pressure contact force between the valve body 9 and the valve seat 7 is increased by screwing the lid with the screw 14 of the rod 8 and rotating the lid. Stopping mechanism. (2) The valve device for a refillable cylinder according to claim (1) of the utility model registration claim, wherein the inner wall surface of the opening 5 is provided with a screw 31 for attaching a gas extraction means or a pressurized gas supply source. Leak prevention mechanism. (3) The utility model according to claim 1 or 2, wherein a rotary positioning boss 32 that fits into the inner diameter of the opening 5 is protruded from the one surface 16 of the lid 15. Leak prevention mechanism for valve devices for refillable cylinders. (4) The leak prevention mechanism for a refillable cylinder valve device according to claim 1, wherein the lid 15 is provided with a cylindrical hem 33 for protecting the neck of the cylinder 3 on the outer periphery.