Two-stage pressure reduction cylinder valve

Abstract

The utility model discloses a two-stage decompression cylinder valve which comprises a valve body, the valve body is provided with a high-pressure air inlet connected with an air cylinder, a low-pressure air outlet connected with an air pipeline and an inflation inlet connected with an inflation pipeline, a first-stage decompression valve and a second-stage decompression valve are installed on the two sides of the valve body respectively, an air inlet hole of the first-stage decompression valve is communicated with the high-pressure air inlet, and an air outlet hole of the second-stage decompression valve is communicated with the low-pressure air inlet. The air outlet hole is communicated with the air inlet hole of the secondary pressure reducing valve; the two-stage pressure reduction cylinder valve adopts two-stage pressure reduction, so that the pressure of output gas is more stable and is not easily interfered by fluctuation of input gas, equipment runs more stably, and the two-stage pressure reduction cylinder valve is particularly suitable for the condition of higher gas storage pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of gas cylinder valves, in particular to a gas cylinder valve with a decompression and gas supply function. Background Art

[0002] The bottled gas system is actually a process of decompressing and outputting gas, mainly composed of a gas cylinder valve responsible for switching and a pressure reducing valve responsible for decompressing and outputting. The traditional gas cylinder valve and pressure reducing valve are respectively independent devices. Later, under the requirement of integration, the pressure reducing valve is integrated into the gas cylinder valve to reduce the probability of device damage and improve the safety of gas use. At present, most of the decompression gas cylinder valves integrating the pressure reducing valve into the gas cylinder valve are single-stage decompression, and there is a problem of large output air pressure fluctuation in some special gas use situations. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a decompression gas cylinder valve with stable output air pressure.

[0004] The technical solution adopted to solve the above technical problem: A two-stage decompression gas cylinder valve, including a valve body, the valve body has a high-pressure air inlet connected to the gas cylinder, a low-pressure air outlet connected to the gas use pipeline, and an inflation port connected to the inflation pipeline. The characteristics are as follows: A first-stage pressure reducing valve and a second-stage pressure reducing valve are respectively installed on both sides of the valve body. Among them, the air inlet hole of the first-stage pressure reducing valve is communicated with the high-pressure air inlet, the air outlet hole is communicated with the air inlet hole of the second-stage pressure reducing valve, and the air outlet hole of the second-stage pressure reducing valve is communicated with the low-pressure air outlet.

[0005] On the above basis, the low-pressure air outlet and the high-pressure air inlet are respectively arranged at the upper and lower ends of the valve body, the first-stage pressure reducing valve, the second-stage pressure reducing valve and the inflation port are arranged at intervals on the side of the valve body, and a switch valve for opening and closing the inflation port is arranged on the other side of the valve body opposite to the inflation port.

[0006] On the above basis, the first-stage pressure reducing valve is a piston type pressure reducing valve, and the second-stage pressure reducing valve is a diaphragm type pressure reducing valve.

[0007] On the above basis, self-closing valves are installed in both the low-pressure air outlet and the inflation port.

[0008] The beneficial effects brought by adopting the utility model: Since the two-stage decompression gas cylinder valve of the utility model adopts two-stage decompression, the pressure of the output gas is more stable, not easily interfered by the fluctuation of the input gas, making the equipment operate more smoothly, and is especially suitable for the situation with higher gas storage pressure. Description of the Drawings

[0009] Figure 1 Longitudinal section of the two-stage decompression gas cylinder valve of the utility model Figure 1 ;

[0010] Figure 2Longitudinal section of the two-stage pressure-reducing bottle valve of the present utility model Figure 2 。 Specific embodiments

[0011] As Figure 1 、 2 shown, a two-stage pressure-reducing bottle valve includes a valve body 1, the valve body having a high-pressure air inlet 1.1 for connecting a gas cylinder, a low-pressure air outlet 1.2 for connecting a gas-using pipeline, and an air inlet 1.3 for connecting an inflation pipeline. In the present utility model, a first-stage pressure-reducing valve 2 and a second-stage pressure-reducing valve 3 are respectively installed on both sides of the valve body 1. Among them, the air inlet hole 2.1 of the first-stage pressure-reducing valve 2 communicates with the high-pressure air inlet 1.1, and the air outlet hole 2.2 communicates with the air inlet 3.1 of the second-stage pressure-reducing valve 3. The air outlet hole 3.2 of the second-stage pressure-reducing valve 3 communicates with the low-pressure air outlet 1.2.

[0012] The high-pressure gas in the gas cylinder enters the first-stage pressure-reducing valve 2 through the high-pressure air inlet 1.1 and the air inlet hole 2.1. After being reduced to gas with an intermediate pressure, it enters the second-stage pressure-reducing valve 3 through the air outlet hole 2.2 and the air inlet 3.1. After being reduced to low-pressure gas again, it enters the low-pressure air outlet 1.2 through the air outlet hole 3.2 and is then transported to the gas-using pipeline. After two-stage pressure reduction, the pressure of the output gas is more stable and is not easily disturbed by the fluctuations of the input gas.

[0013] Both the first-stage pressure-reducing valve 2 and the second-stage pressure-reducing valve 3 among them adopt conventional gas pressure-reducing valves. In this embodiment, the first-stage pressure-reducing valve 2 adopts a piston-type pressure-reducing valve, and the second-stage pressure-reducing valve 3 adopts a diaphragm-type pressure-reducing valve.

[0014] Structural principle of the first-stage pressure-reducing valve 2: A valve cavity 2.3 is formed on the side wall of the valve body 1. A piston 2.4 is installed in the valve cavity 2.3. The piston 2.4 divides the valve cavity 2.3 into an atmospheric pressure cavity 2.3.1 and a pressure cavity 2.3.2. A valve pad 2.5 for blocking the air inlet hole 2.1 is installed at the inner end of the piston 2.4. A spring 2.6 for keeping the piston 2.4 away from the air inlet hole 2.1 is installed in the atmospheric pressure cavity 2.3.1. The air outlet hole 2.2 communicates with the pressure cavity 2.3.2. When using gas, the high-pressure gas enters the pressure cavity 2.3.2 through the air inlet hole 2.1. The pressure of the gas pushes the piston 2.4 to overcome the elastic force of the spring 2.6 and pushes the valve pad 2.5 towards the air inlet hole 2.1. The purpose is to control the flow rate of the gas flowing in from the air inlet hole 2.1 so that the pressure in the pressure cavity 2.3.2 reaches an equilibrium state with the elastic force of the spring 2.6. At this time, the pressure in the pressure cavity 2.3.2 is a relatively low intermediate pressure. The gas at this pressure then enters the second-stage pressure-reducing valve 3 through the air outlet hole 2.2.

[0015] Structural principle of the secondary pressure reducing valve 3: Another valve chamber 3.3 is formed on the side wall of the valve body 1. A hinged lever 3.4 and a diaphragm 3.5 are installed in the valve chamber 3.3. The diaphragm 3.5 divides the valve chamber 3.3 into an atmospheric pressure chamber 3.3.1 and a pressure chamber 3.3.2. A push seat 3.6 is fixedly installed in the center of the diaphragm 3.5. One end of the lever 3.4 is connected to the push seat 3.6, and the other end is installed with a valve pad 3.7 that blocks the air inlet hole 3.1. A spring 3.8 that pushes against the diaphragm 3.5 is installed in the atmospheric pressure chamber 3.3.1. Gas enters the pressure chamber 3.3.2 from the air inlet hole 3.1. The pressure of the gas pushes the diaphragm 3.5 to overcome the elastic force of the spring 3.8 and drives the push seat 3.6 to move. The push seat 3.6 pulls the lever 3.4 to swing, and the valve pad 3.7 at the other end of the lever 3.4 presses against the air inlet hole 3.1 to control the flow rate of the gas flowing in from the air inlet hole 3.1 until the pressure in the pressure chamber 3.3.2 reaches an equilibrium state with the elastic force of the spring 3.8. At this time, the pressure of the gas in the pressure chamber 3.3.2 is the lower gas-using pressure, and the gas at this pressure then flows out of the low-pressure air outlet 1.2 from the air outlet hole 3.2.

[0016] As the optimal implementation scheme of this embodiment, to make the structure of the two-stage pressure reducing valve more reasonable. The low-pressure air outlet 1.2 and the high-pressure air inlet 1.1 are respectively arranged at the upper and lower ends of the valve body 1. The primary pressure reducing valve 2, the secondary pressure reducing valve 3, and the inflation port 1.3 are arranged at intervals on the side of the valve body 1. Of course, a switch valve should be provided for the inflation port 1.3. Therefore, a switch valve 4 for opening and closing the inflation port 1.3 is arranged on the other side of the valve body 1 opposite to the inflation port 1.3. A conventional plunger-type switch valve is used in this embodiment.

[0017] To prevent gas leakage problems in the two-stage pressure reducing valve and ensure gas-using safety, self-closing valves 5 are installed in both the low-pressure air outlet 1.2 and the inflation port 1.3. The self-closing valve 5 is a conventional gas normally closed valve, which can be pushed open by the joint core when performing gas-using and inflation operations to ensure normal gas-using and inflation.

Claims

1. A two-stage pressure-reducing cylinder valve, comprising a valve body, the valve body having a high-pressure air inlet connected to a gas cylinder, a low-pressure air outlet connected to a gas-using pipeline, and an inflation port connected to an inflation pipeline, characterized in that: A primary pressure reducing valve and a secondary pressure reducing valve are respectively installed on both sides of the valve body. The air inlet hole of the primary pressure reducing valve is communicated with the high-pressure air inlet, the air outlet hole is communicated with the air inlet hole of the secondary pressure reducing valve, and the air outlet hole of the secondary pressure reducing valve is communicated with the low-pressure air outlet.

2. The two-stage pressure-reducing bottle valve according to claim 1, wherein: The low-pressure air outlet and the high-pressure air inlet are respectively arranged at the upper and lower ends of the valve body. The primary pressure reducing valve, the secondary pressure reducing valve and the inflation port are arranged at intervals on the side of the valve body. A switching valve for opening and closing the inflation port is arranged on the other side of the valve body opposite to the inflation port.

3. The two-stage pressure-reducing bottle valve according to claim 1, characterized in that: The primary pressure reducing valve is a piston type pressure reducing valve, and the secondary pressure reducing valve is a diaphragm type pressure reducing valve.

4. The two-stage pressure-reducing bottle valve according to any one of claims 1-3, characterized in that: Self-closing valves are installed in both the low-pressure air outlet and the inflation port.

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