JP2647808B2 - Gas valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas valve used for injecting gas into a gas cylinder.

[0002]

2. Description of the Related Art Generally, gas injected into a vehicle air conditioner is filled in a sealed gas cylinder. When injecting the gas in the gas cylinder into the cooler, a gas valve having a perforation function is used.

As the above-mentioned gas valve, the one shown in FIG. 3 has been conventionally known. In this gas valve, a screw hole 31 formed in a valve body 30 is screw-engaged with an injection cylinder part a of a gas cylinder A to attach the valve body 30 to the gas cylinder A, and a screw hole 32 in the valve body 30 is screwed. The combined valve stem 33 is moved in the axial direction by rotating the handle 34, and the needle 35 at the tip of the valve stem is pierced through the cover plate a 'of the injection cylinder part a. In the direction of the arrow to open the piercing hole 36 of the needle 35, and allow the gas flowing into the valve body 30 from the piercing hole 36 to flow out of the hose connection tube 37 provided on the side of the valve body 30. I have.

[0004]

In the above-mentioned conventional gas valve, the valve rod 33 is moved forward toward the injection cylinder a of the gas cylinder A, and then the valve rod 33 is opened by the hose connection cylinder 37. Since it is necessary to retreat to the position, there is a problem in operability. In general, gas injection into a cooling machine requires several gas cylinders A, and the above operation must be repeated each time the gas cylinders A are replaced, so that there is a problem in that gas injection takes a very long time.

If gas remains in the gas cylinder A after the gas is injected, the valve rod 33 is moved forward and the puncture hole 36 is formed.
Needs to be closed with the needle 35, which is very troublesome and often involves forgetting the closing operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide an excellent gas injection operability. Even if gas remains in the gas cylinder after gas injection, the gas cylinder is automatically closed by a simple operation of removing the injection hose. It is to provide a gas valve that can.

[0007]

According to the present invention, there is provided a gas cylinder having a screw hole at one end which is screwed with a screw formed on an outer periphery of an injection cylinder of a gas cylinder. A valve needle storage space is formed inside a valve body provided with a hose connection shaft at an end, and a cylindrical needle having a sharp tip at an inlet side passage extending from the bottom surface of the screw hole to the valve body storage space. A rear end portion is fixed, and a valve rod insertion hole communicating with the valve body storage space is provided on the axis of the hose connection shaft, and the valve body storage space has an inlet side formed by pressure of gas flowing through an inlet side passage. A first valve body for preventing backflow for opening the passage and a second valve body for opening and closing the valve rod insertion hole are incorporated. The second valve element is slidably inserted into the valve rod insertion hole, and is connected to the hose connection tube. When connecting a hose, install a valve stem that is pressed in the axial direction at the end of the hose. , On its valve stem second valve body when opening the valve stem insertion hole, it adopts a configuration in which a gas outlet passage communicating with the valve body accommodating space.

[0008]

In the gas valve constructed as described above, when the valve body is attached to the injection cylinder by the engagement of the screw hole with the injection cylinder of the gas cylinder, the needle pierces the cover plate of the injection cylinder, and the gas cylinder is slid. The gas inside the nozzle flows from the needle to the inlet side passage, and the pressure of the gas causes the first valve body to open the inlet side passage, so that the gas flows into the valve body storage space.

Therefore, when a hose is connected to the hose connecting cylinder, the valve stem is pushed in the axial direction, the second valve body opens the valve stem insertion hole, and gas in the valve body storage space flows from the gas outflow passage to the hose. Flows.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, a valve body 1 includes a cylindrical body 2, a cylinder fitting 4 formed on the inner periphery of one end of the body 2 and screwed to a screw 3, and the other end of the body 2. A hose connector 6 is provided on the inner circumference of the part and is screwed to the screw 5. The space between the cylinder connector 4 and the hose connector 6 is a valve body storage space 7.

A screw hole 8 is provided at the tip of the cylinder connecting tool 4. The screw hole 8 is provided in the injection cylinder portion a of the gas cylinder A.
Can be screw-engaged with a screw b formed on the outer periphery of.

An inlet side passage 9 communicating with the valve housing space 7 is provided on the bottom surface of the screw hole 8. Inlet passage 9
The rear end of the cylindrical needle 10 is fixed by means such as press fitting. A sharp portion 11 is provided at the tip of the needle 10 located in the screw hole 8.

The hose connector 6 has a hose connection shaft 12 to which a hose is connected, and a valve rod insertion hole 13 communicating with the valve housing space 7 is provided on the axis of the hose connection shaft 12. I have.

In the valve body storage space 7, a first valve body 14 for opening and closing the inlet side passage 9, a second valve body 15 for opening and closing the valve rod insertion hole 13, and both valve bodies 14, 15 are pressed in the closing direction. Spring 1
6 is incorporated.

The first valve element 14 has an O-ring 17, and the O-ring 17 is provided at the lower end of the valve element storage space 7.
8 can be contacted. The first valve element 14 moves in a direction in which the O-ring 17 is separated from the valve seat 18 by the pressure of the gas flowing into the inlet-side path 9 to open the inlet-side path 9, and the pressure of the valve element storage space 7 is reduced to the inlet side. When the pressure becomes higher than the pressure in the passage 9, the inlet-side passage 9 is closed to prevent the gas in the valve housing space 7 from flowing back into the inlet-side passage 9.

The second valve body 15 has an O-ring 19 that can abut on the lower end surface of the hose connector 6. This second valve body 15
The valve stem 20 is slidably inserted into the valve stem insertion hole 13 of the hose connector 6 and has an end protruding from the valve stem insertion hole 13 to the outside.
When the joint pipe C attached to the end of the hose B is screw-engaged, the end face of the hose B pushes the valve stem 20 and the second valve body 1
Release 5

The valve stem 20 is provided with a gas outlet 21 communicating with the valve housing space 7 when the second valve body 15 opens the valve stem insertion hole 13. It is open at the end face.

Now, when the valve body 1 is tightened by screwing the screw hole 8 of the cylinder connector 4 into the injection cylinder a of the gas cylinder A, as shown in FIG. a ′, the gas in gas cylinder A is
The first valve element 14 moves in a direction away from the valve seat 18 by the pressure of the gas, and the inlet-side passage 9 is opened.

Therefore, the gas flowing into the inlet side passage 9 flows into the valve body storage space 7, and the second valve body 15 closes the valve rod insertion hole 13 by the pressure of the gas in the valve body storage space 7. .

When the joint pipe C at the end of the hose B is screwed into the hose connection shaft 12 of the hose connector 6 in a state where the valve body 1 is connected to the gas cylinder A, the end of the valve stem 20 is at the tip end surface of the hose B. The valve stem 20 is axially moved by the pushing, and the second valve body 15 is inserted into the valve stem insertion hole 13.
To release.

Therefore, the gas flowing into the valve housing space 7 flows from the valve rod insertion hole 13 into the hose B, and is injected into the cooling device to which the hose B is connected.

Generally, a plurality of gas cylinders A are used for injecting gas into the cooling device. For this reason, when the gas cylinder A becomes empty, it is necessary to replace it with a new gas cylinder A.

When replacing the gas cylinder A, the valve main body 1 is removed from the empty gas cylinder A, and the valve main body 1 is screw-engaged with the injection cylinder part a of the new gas cylinder A in the same manner as described above.

Here, when the valve body 1 is removed from the empty gas cylinder A, the pressure in the valve body storage space 7 is higher than the pressure in the inlet side passage 9 because the second valve body 15 is in an open state. The first valve element 14 closes the inlet side passage 9 due to the pressure difference.

Therefore, the gas injected into the cooler does not flow backward and leak outside.

When the gas is injected into the cooling machine and the gas remains in the gas cylinder A when the gas is filled, the hose B is removed and the valve body 1 is connected to the gas cylinder A.

By removing the hose B, the valve stem 20 is released from being pressed by the hose B, and the second valve body 15 closes the valve stem insertion hole 13 by the pressure of the gas in the valve body housing space 7. The closure prevents the gas from flowing out of the gas cylinder A.

In the embodiment, the first valve element 14 and the second valve element 15
The first valve element 14 is opened and closed by the pressure of the gas in the inlet side passage 9 and the valve element storage space 7 while the springs 16 are incorporated between the first and second elements to press the two valve elements 14 and 15 in the closing direction. ,
Since the second valve element 15 is closed by the pressure of the gas in the valve element storage space 7, the spring 16 may be omitted.

[0030]

As described above, according to the present invention, the gas in the gas cylinder can flow into the hose by screwing the valve body into the injection cylinder of the gas cylinder and connecting the hose to the hose connection shaft. When the main body is removed, the first valve body automatically closes the inlet side passage by the pressure of the gas, so that the valve rod is moved forward, and then moved backward to inject the gas compared to the conventional gas valve. It is excellent in operability and can quickly and efficiently inject gas that requires several gas cylinders.

When the hose is removed with the valve body connected to the gas cylinder, the pressure of the gas in the valve body storage space causes the second valve body to close the valve rod insertion hole. It is possible to prevent the gas remaining in the gas cylinder from flowing out.

Further, since the first valve element is opened and closed by the pressure of gas and the second valve element is opened and closed by attaching and detaching a hose required for gas injection, lever operation and handle operation are performed for opening and closing each valve element. This can be unnecessary, and the flow and cutoff of gas can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a gas valve according to the present invention.

FIG. 2 is a longitudinal sectional front view showing a usage state of the gas valve according to the first embodiment;

FIG. 3 is a longitudinal sectional front view showing a conventional gas valve.

[Explanation of symbols]

 Reference Signs List A gas cylinder a injection cylinder part b screw 1 valve body 7 valve body storage space 8 screw hole 9 inlet side passage 10 needle 12 hose connection shaft 13 valve rod insertion hole 14 first valve element 15 second valve element 20 valve rod 21 gas outflow Road

Claims (1)

(57) [Claims] 1. A valve body storage space in a valve body having a screw hole at one end and a hose connection shaft provided at the other end, the screw hole being screw-engaged with a screw formed on an outer periphery of an injection cylinder portion of a gas cylinder. And fixing a rear end of a cylindrical needle having a sharp end to an inlet side passage extending from the bottom surface of the screw hole to the valve body housing space, and mounting the valve on an axis of the hose connection shaft. A valve stem insertion hole communicating with the body housing space, a first valve body for preventing backflow for opening the inlet side passage by the pressure of gas flowing into the inlet side passage in the valve body housing space, and a valve stem insertion hole. And a second valve body which is slidably inserted into a valve rod insertion hole, and which is pressed in the axial direction by a hose tip when the hose is connected to the hose connection tube. When the second valve element opens the valve rod insertion hole, the valve element storage space is provided in the valve element. A gas valve with a gas outflow passage communicating with the