Pneumatic control gas safety valve

Abstract

The utility model discloses a pneumatic control gas safety valve which comprises a pipe body, a thread fixing sleeve, a conical valve core, a spring, a positioning rod and a sealing ring, one end of the pipe body is provided with a fixing flange, the outer edge of the fixing flange is sleeved with the thread fixing sleeve, and the other end of the pipe body is provided with a conical sleeve connector used for fixing a gas hose. A conical cavity is further formed in the middle of the pipe body, a positioning rod extending into the conical cavity is arranged in the pipe body, the outer edge of the positioning rod is sleeved with a conical valve element in sliding connection with the axis, a plurality of sealing rings are arranged on the outer wall of the conical valve element, and a spring is arranged between the fixed end of the positioning rod and the conical valve element. When a gas pipeline falls off, the flow speed of gas in the pipe body is increased, and the pressure difference between the two ends of the conical valve element is increased due to the too high flow speed, so that the conical valve element is driven to move towards one side of the conical cavity till the sealing part of the conical valve element is attached to the conical cavity to complete sealing, and therefore the gas hose is automatically closed after falling off, and continuous leakage of gas is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of gas valves, in particular to a pneumatically controlled gas safety valve. Background Art

[0002] Gas is an indispensable daily consumable in modern families. For safety reasons, gas alarms are usually installed in the kitchen. However, when a gas leak occurs, the gas alarm can only make a sound to serve as an alarm reminder. Once a gas leak is caused by the aging and falling off of the gas hose, and the valve cannot be closed in time, the gas will continue to leak, which can easily cause a major safety accident. Therefore, a pneumatically controlled gas safety valve is designed to solve the above problem. Utility Model Content

[0003] In view of the shortcomings of the existing gas valves, the purpose of the utility model is to provide a pneumatically controlled gas safety valve, which has the advantages of automatically closing after the gas hose falls off to prevent leakage.

[0004] To achieve the above-mentioned purpose, a technical solution adopted by the utility model is: a pneumatically controlled gas safety valve, comprising a pipe body, a threaded fixing sleeve, a conical valve core, a spring, a positioning rod and a sealing ring, wherein one end of the pipe body is provided with a fixing flange, the outer edge of the fixing flange is provided with a threaded fixing sleeve, the threaded fixing sleeve is used to fix the pipe body to the outlet end of the gas pipe, the other end of the pipe body is provided with a conical sleeve interface for fixing the gas hose, the middle part of the pipe body is also provided with a conical cavity, a positioning rod extending into the conical cavity is provided in the pipe body, the axis of the positioning rod is colinear with the axis of the pipe body, the outer edge of the positioning rod is provided with a conical valve core connected with the axis in a sliding manner, the outer wall of the conical valve core is provided with a plurality of sealing rings, a spring is provided between the fixed end of the positioning rod and the conical valve core, the spring forces the conical valve core to stay away from the conical cavity;

[0005] Preferably, one end of the conical valve core is a sealing portion that fits the taper of the conical cavity, and a plurality of sealing rings are provided on the outer edge of the sealing portion. The other end of the conical valve core is a guide portion, and the guide portion faces the gas outlet of the gas pipe and is used to guide the internal gas to flow around the conical valve core. When the gas pipeline falls off, the gas flow rate in the pipe body increases. Since the gap between the conical valve core and the pipe body is limited, the gas flow rate cannot be changed. An excessively fast flow rate will increase the pressure difference between the two ends of the conical valve core, thereby driving the conical valve core to move toward one side of the conical cavity. While the conical valve core moves, the spring is compressed until the sealing portion of the conical valve core fits the conical cavity to complete the sealing, thereby automatically closing after the gas hose falls off to prevent continuous gas leakage.

[0006] Preferably, the contact surface between the fixed flange and the gas pipeline also has a sealing ring;

[0007] Preferably, the positioning rod also has a balancing flow channel running through it, and the balancing flow channel is used to balance the pressure difference generated inside the conical valve core;

[0008] The beneficial effect of the utility model is that when the gas pipeline falls off, the gas flow rate in the pipe body increases. Due to the limited gap between the conical valve core and the pipe body, the gas flow rate cannot be changed. The excessively fast flow rate will cause the pressure difference at both ends of the conical valve core to increase, thereby driving the conical valve core to move toward one side of the conical cavity. While the conical valve core moves, the spring is compressed until the sealing part of the conical valve core fits the conical cavity to complete the sealing, thereby automatically closing after the gas hose falls off to prevent continuous leakage of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a cross-sectional structural view of the utility model in a normal state;

[0010] Figure 2 This is a cross-sectional structural view of the leakage protection state of the utility model;

[0011] Figure 3 This is a partial enlarged view of area I in the utility model 2;

[0012] Figure 4 This is a three-dimensional structural view of the conical valve core of the utility model. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0014] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0015] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided with", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] See also Figures 1 to 4, the utility model embodiment includes:

[0017] A pneumatically controlled gas safety valve comprises a pipe body 1, a threaded fixing sleeve 2, a conical valve core 3, a spring 4, a positioning rod 5 and a sealing ring 6. One end of the pipe body 1 is provided with a fixing flange 11, and the outer edge of the fixing flange 11 is sleeved with a threaded fixing sleeve 2, and the threaded fixing sleeve 2 is used to fix the pipe body 1 to the outlet end of the gas pipe. The other end of the pipe body 1 is provided with a conical socket 12 for fixing a gas hose. The middle part of the pipe body 1 also has a conical cavity 13. A positioning rod 5 extending into the conical cavity 13 is provided in the pipe body 1, and the axis of the positioning rod 5 is colinear with the axis of the pipe body 1. The outer edge of the positioning rod 5 is sleeved with a conical valve core 3 slidably connected with the axis, and the outer wall of the conical valve core 3 is provided with a plurality of sealing rings 6. A spring 4 is provided between the fixed end of the positioning rod 5 and the conical valve core 3, and the spring 4 forces the conical valve core 3 to stay away from the conical cavity 13.

[0018] One end of the conical valve core 3 is a sealing portion 31 that fits the taper of the conical cavity 13. The outer edge of the sealing portion 31 is provided with a plurality of sealing rings 6. The other end of the conical valve core 3 is a guide portion 32. The guide portion 32 faces the gas outlet of the gas pipe and is used to guide the internal gas to flow around the conical valve core 3. When the gas pipeline falls off, the gas flow rate in the pipe body 1 increases. Since the gap between the conical valve core 3 and the pipe body 1 is limited, the gas flow rate cannot be changed. The excessively fast flow rate will increase the pressure difference between the two ends of the conical valve core 3, thereby driving the conical valve core 3 to move toward one side of the conical cavity 13. While the conical valve core 3 moves, the spring 4 is compressed until the sealing portion 31 of the conical valve core 3 fits the conical cavity 13 to complete the sealing, thereby automatically closing after the gas hose falls off to prevent continuous gas leakage.

[0019] The contact surface between the fixed flange 11 and the gas pipeline also has a sealing ring 6;

[0020] The positioning rod 5 also has a balancing flow channel 51 running through it, and the balancing flow channel 51 is used to balance the pressure difference generated inside the conical valve core 3;

[0021] Through the above settings, in the actual working process, its specific working principle is as follows:

[0022] When the gas pipeline falls off, the gas flow rate in the pipe body 1 increases. Due to the limited gap between the conical valve core 3 and the pipe body 1, the gas flow rate cannot be changed. The excessively fast flow rate will increase the pressure difference between the two ends of the conical valve core 3, thereby driving the conical valve core 3 to move toward the conical cavity 13. When the conical valve core 3 moves, the spring 4 is compressed until the sealing portion 31 of the conical valve core 3 fits the conical cavity 13 to complete the sealing, so that the gas hose is automatically closed after it falls off to prevent continuous gas leakage.

[0023] When the safety valve needs to be reset, the main gas valve is first closed, and after the air pressure in the pipe body 1 is balanced, the spring 4 forces the conical valve core 3 to return to the initial position;

[0024] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pneumatically controlled gas safety valve, characterized in that: It includes a tube body, a threaded fixing sleeve, a conical valve core, a spring, a positioning rod and a sealing ring. One end of the tube body is provided with a fixing flange, and the outer edge of the fixing flange is provided with a threaded fixing sleeve. The threaded fixing sleeve is used to fix the tube body to the outlet end of the gas pipe. The other end of the tube body is provided with a conical sleeve interface for fixing the gas hose. The middle part of the tube body also has a conical cavity. A positioning rod extending into the conical cavity is provided in the tube body, and the axis of the positioning rod is colinear with the axis of the tube body. The outer edge of the positioning rod is provided with a conical valve core slidably connected to the axis. A plurality of sealing rings are provided on the outer wall of the conical valve core. A spring is provided between the fixed end of the positioning rod and the conical valve core. The spring forces the conical valve core to stay away from the conical cavity.

2. A pneumatically controlled gas safety valve according to claim 1, characterized in that: One end of the conical valve core is a sealing part that fits the taper of the conical cavity, and a plurality of sealing rings are arranged on the outer edge of the sealing part. The other end of the conical valve core is a guide part, and the guide part faces the gas outlet of the gas pipe and is used to guide the internal gas to flow around the conical valve core.

3. A pneumatically controlled gas safety valve according to claim 1, characterized in that: The contact surface between the fixed flange and the gas pipeline is also provided with a sealing ring.

4. A pneumatically controlled gas safety valve according to claim 1, characterized in that: The positioning rod is also provided with a balancing flow channel penetrating therein, and the balancing flow channel is used to balance the pressure difference generated inside the conical valve core.

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