Overflow cut-off gas cylinder valve

Abstract

The utility model discloses an overflowing cut-off gas cylinder valve which comprises a valve body, an upper cavity channel and a lower cavity channel which are divided by a valve seat are arranged in the valve body, a transverse gas outlet communicated with the upper cavity channel is formed in the side portion of the valve body, an overflowing cut-off mechanism is installed in the gas outlet, and the overflowing cut-off mechanism comprises a core seat connected with the gas outlet in a sealed mode. The core seat is provided with a through air outlet channel, a valve seat opening is formed in the air outlet channel, and a ball used for blocking the valve seat opening and a first spring keeping the ball moving towards the valve seat opening are installed in the air outlet channel in a clearance fit mode. The overflowing cut-off mechanism is installed at the gas outlet of the gas cylinder valve, when a gas using pipeline is abnormally damaged, the gas flow and the flow speed in the pipeline are suddenly increased, the gas flow with the flow speed and the flow suddenly increased pushes the ball to overcome the first spring to move towards the valve seat opening, the valve seat opening is blocked, and gas leakage is cut off.

Description

Technical Field

[0001] The utility model relates to the technical field of bottle valves, in particular to an overcurrent cut-off bottle valve that can automatically close a gas cylinder when a gas pipeline suffers from abnormal breakage, resulting in a large amount of gas leakage. Background Art

[0002] In daily use, the gas pipeline will inevitably suffer from abnormal breakage. When the gas pipeline is damaged, in most cases, people fail to detect it in time, resulting in a large amount of gas leakage, and then triggering major disaster accidents. Therefore, it is necessary to develop a bottle valve that can close the gas cylinder in time when the gas pipeline suffers from abnormal breakage. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a bottle valve that can close the gas cylinder in time when the gas pipeline suffers from abnormal breakage.

[0004] The technical solution adopted to solve the above technical problem: An overcurrent cut-off bottle valve includes a valve body. The valve body has an upper cavity and a lower cavity separated by a valve seat. A lateral air outlet communicating with the upper cavity is formed on the side of the valve body. An overcurrent cut-off mechanism is installed in the air outlet. Its characteristics are: The overcurrent cut-off mechanism includes a core seat hermetically connected to the air outlet. The core seat has a through air outlet cavity. A valve seat opening is formed in the air outlet cavity. A ball used to block the valve seat opening with clearance fit and a first spring for keeping the ball moving towards the valve seat opening are installed in the air outlet cavity.

[0005] On the above basis, a valve seat sleeve that is hermetically connected and sleeved with the core seat and blocked by the core seat and a second spring for keeping the core seat blocking the valve seat sleeve are installed in the air outlet.

[0006] On the above basis, a nut connected by thread is installed on the core seat, and a sealing ring for blocking the valve seat sleeve is clamped between the nut and the core seat.

[0007] On the above basis, a pressure relief valve communicating with the upper cavity is installed on the side of the valve body.

[0008] The beneficial effects brought by adopting the utility model: Since the overcurrent cut-off mechanism is installed at the air outlet of the bottle valve of the utility model, when the gas pipeline suffers from abnormal breakage, the gas flow rate and velocity in the pipeline will suddenly increase. The airflow with suddenly increased velocity and flow rate will push the ball to move towards the valve seat opening against the first spring, block the valve seat opening, and cut off the external leakage of gas. Therefore, by adopting the overcurrent cut-off bottle valve of the utility model, the bottle valve can be closed in time when the gas pipeline suffers from abnormal breakage. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the overcurrent cut-off bottle valve of the utility model. Detailed implementation mode

[0010] As Figure 1 shown, an overcurrent cut-off gas cylinder valve includes a valve body 1. Inside the valve body 1, there are an upper channel 1.2 and a lower channel 1.3 divided by a valve seat 1.1. A lateral air outlet 1.4 communicating with the upper channel 1.2 is formed on the side of the valve body 1, and an overcurrent cut-off mechanism is installed in the air outlet 1.4. Generally, the valve body 1 has an air inlet 1.5 threadedly connected to the gas cylinder, a lateral air outlet 1.4 for connecting a gas pipeline, and a channel communicating the air inlet 1.5 and the air outlet 1.4. A valve seat 1.1 is formed in the channel. The valve seat 1.1 divides the channel into an upper channel 1.2 and a lower channel 1.3. A valve core 2 for blocking the valve seat 1.1 is installed in the upper channel 1.2, and a hand wheel 11 for driving the valve core 2 to lift and lower is installed on the top of the valve body 1. In the present utility model, the overcurrent cut-off mechanism includes a core seat 3 hermetically connected to the air outlet 1.4. The core seat 3 has a through air outlet channel 3.1. A valve seat opening 3.2 is formed in the air outlet channel 3.1. A ball 4 for blocking the valve seat opening 3.2 with clearance fit and a first spring 5 for keeping the ball 4 moving towards the valve seat opening 3.2 are installed in the air outlet channel 3.1.

[0011] Under normal gas usage conditions, the gas will flow out of the air outlet 1.4 from the air outlet channel 3.1 of the core seat 3. At this time, only the thrust of the air flow with a normal gas usage flow rate on the ball 4 cannot overcome the elastic force of the first spring 5 to push the ball 4 to block the valve seat opening 3.2. Since there is a gap between the ball 4 and the air outlet channel 3.1, the gas can flow through these gaps. When the gas pipeline suffers abnormal damage and a large amount of gas leaks, the gas flow rate and velocity in the pipeline will suddenly increase. The air flow with suddenly increased velocity and flow rate will push the ball 4 to move towards the valve seat opening 3.2 against the elastic force of the first spring 5, block the valve seat opening 3.2, and cut off the gas leakage. The whole process can be completed almost instantly, with timely response, and can effectively prevent major disaster accidents caused by gas leakage.

[0012] Of course, the sealed connection between the core seat 3 and the air outlet 1.4 can be connected to the air outlet 1.4 through other conventional components in addition to directly connecting to the air outlet 1.4. In this embodiment, a valve seat sleeve 6 hermetically connected and blocked by the core seat 3 is installed in the air outlet 1.4, and a second spring 7 for keeping the core seat 3 blocking the valve seat sleeve 6 is provided. A one-way valve structure for restricting the flow in the air outlet direction is formed by the core seat 3, the valve seat sleeve 6, and the second spring 7. In this way, during inflation, the larger inflation pressure can be used to push open the core seat 3 to achieve rapid inflation. Also, during the gas cylinder inspection, the core seat 3 can be pushed open from the outside to achieve rapid exhaust and vacuum pumping.

[0013] The seal of the core seat 3 can be sealed with a conventional sealing ring. Specifically, a nut 8 connected by threads is installed on the core seat 3, and a sealing ring 9 for blocking the valve seat sleeve 6 is clamped between the nut 8 and the core seat 3, which is beneficial to processing and assembly.

[0014] When a pipeline breakage and leakage occur, it is necessary to check the breakage and leakage location. First, turn the handwheel 11 to close the gas cylinder valve, and then complete the replacement and repair of the pipeline. At this time, it is necessary to reset the overcurrent cut-off mechanism. To facilitate the reset of the overcurrent cut-off mechanism, a pressure relief valve 10 communicating with the upper chamber 1.2 is installed on the side of the valve body 1. The pressure relief valve 10 is a conventional component, with a normally closed valve 10.1 installed inside and a button 10.2 installed outside. It is communicated with the upper chamber 1.2 through a through hole 1.6. Pressing the button 10.2 can open the normally closed valve 10.1, and the upper chamber 1.2 is communicated with the outside through the through hole 1.6 via the pressure relief valve 10. In this way, the upper chamber 1.2 originally in a high-pressure state becomes an atmospheric pressure state, and the ball 4 leaves the valve seat opening 3.2 under the elastic force of the first spring 5, and the overcurrent cut-off mechanism is reset.

Claims

1. An overcurrent cut-off gas cylinder valve, comprising a valve body. An upper channel and a lower channel divided by a valve seat are arranged in the valve body. A lateral air outlet communicating with the upper channel is formed on the side of the valve body. An overcurrent cut-off mechanism is installed in the air outlet. It is characterized in that: The overcurrent cut-off mechanism includes a core seat sealingly connected to the air outlet. The core seat has a through air outlet cavity, a valve seat opening is formed in the air outlet cavity, and a ball for plugging the valve seat opening with clearance fit and a first spring for maintaining the tendency of the ball to move towards the valve seat opening are installed in the air outlet cavity.

2. The overcurrent cut-off gas cylinder valve according to claim 1, characterized in that: A valve seat sleeve that is sealingly connected and sleeved with the core seat and blocked by the core seat, and a second spring for maintaining the core seat to block the valve seat sleeve are installed in the air outlet.

3. The overcurrent cut-off gas cylinder valve according to claim 2, characterized in that: A nut connected by thread is installed on the core seat, and a sealing ring for plugging the valve seat sleeve is clamped between the nut and the core seat.

4. The overcurrent cut-off gas cylinder valve according to any one of claims 1-3, characterized in that: A pressure relief valve communicating with the upper cavity is installed on the side of the valve body.

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