Valve leak protection structure for natural gas

Abstract

The utility model discloses a valve leak protection structure for natural gas, including fixed post and set up inside the intercommunication passage, intercommunication passage includes the thread groove for installing the air inlet pipe, and the thread groove is located fixed post inside one side intercommunication to have the intercommunication groove, the inside of intercommunication groove is provided with the sealing assembly, and one side of sealing assembly is provided with the drive structure, the utility model discloses the reasonable design structure through the fixed post installation between natural gas air inlet pipe and valve, through intercommunication passage with natural gas air inlet pipe and valve intercommunication, and set up sealing structure and drive structure in the inside of fixed post, when the leakage appears, and drive structure drives sealing structure and seals the gas outlet of natural gas air inlet pipe, realize the sealing in the initial position of connection, solve traditional solenoid valve plugging mode only can realize the sealing in the inside of the pipeline connected with solenoid valve output end, if the leakage happens in the connecting part of natural gas main pipe gas outlet pipe and solenoid valve, it is difficult to realize the sealing and play the problem of leak protection.

Description

Technical Field

[0001] This utility model relates to the field of gas safety technology, specifically to a gas valve leak-proof protection structure for natural gas. Background Technology

[0002] The leak-proof protection structure of natural gas valves is the core design to ensure the safety of gas use. Its core function is to prevent natural gas leakage caused by valve failure, loose connection or improper operation by means of multiple seals, pressure monitoring and automatic shut-off.

[0003] The internal sealing structure of traditional natural gas solenoid valves has certain limitations. Taking the solenoid valve for natural gas pipelines disclosed in Chinese utility model patent CN111365512A as an example, the sealing structure of this type of solenoid valve is mostly located in the internal center. When the internal pressure device of the solenoid valve detects an abnormality, or when a natural gas leak is detected externally, the solenoid valve will automatically close when the equipment is started. However, this solenoid valve sealing method can only seal the inside of the pipeline connected to the output end of the solenoid valve. If the leak occurs at the connection between the natural gas main outlet pipe and the solenoid valve, this sealing method of the traditional solenoid valve cannot play a role in preventing gas leakage. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a gas leakage prevention protection structure for natural gas valves.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A gas valve leak-proof protection structure for natural gas includes a fixed column, the fixed column having a connecting channel inside, the two ends of which are respectively connected to a natural gas inlet pipe and a natural gas valve, for connecting the natural gas inlet pipe and the natural gas valve; The connecting channel includes a threaded groove at one end of the fixed column and an outlet pipe at the other end of the fixed column, so that the threaded groove and the outlet pipe are respectively connected to the inlet pipe and the natural gas valve. The threaded groove is connected to a connecting groove on the side inside the fixed column, and the connecting groove and the outlet pipe are connected through a venting groove. The connecting groove is equipped with a sealing component. A driving structure is provided on one side of the sealing component to drive the sealing component to move towards the side of the threaded groove, so as to seal the gas outlet of the gas inlet pipe through the sealing component and cut off the gas source at the node of natural gas flow.

[0006] Furthermore, the sealing assembly includes a transmission structure installed inside the fixed column. One side of the transmission structure is connected to the drive structure, and the other side of the transmission structure is connected to a sealing ball. The sealing ball is disposed inside the communicating groove, and the center of the sealing ball is located on the axis of the threaded groove.

[0007] Furthermore, the sealing ball is a silicone ball, and the diameter of the sealing ball is larger than the inner diameter of the natural gas inlet pipe.

[0008] Furthermore, the transmission structure includes a fixed cylinder fixedly connected inside the fixed column. The fixed cylinder has a sealing cavity inside. A sealing disc and a sealing plate are slidably connected to the inner wall of the sealing cavity. A connecting rod is fixedly connected to the center of the side surface of the sealing plate away from the sealing disc. The end of the connecting rod away from the sealing plate passes through one side of the fixed cylinder and extends into the communicating groove. The end of the connecting rod located inside the communicating groove is fixedly connected to the sealing ball. The output end of the drive structure passes through one side of the fixed cylinder, and the output end of the drive structure located inside the fixed cylinder is fixedly connected to the center of the surface of the sealing disc.

[0009] Furthermore, both the fixed cylinder and the sealing cavity have horizontal convex cross-sectional shapes, with the sealing disc located on the side with the larger diameter and the sealing plate located on the side with the smaller diameter. Both the sealing disc and the sealing plate have sealing rings on their outer sides.

[0010] Furthermore, a positioning block is fixedly connected to the inner wall of the fixed cylinder. The positioning block is located at the end of the smaller diameter part of the U-shaped part of the fixed cylinder, which plays a limiting role in the sealing plate.

[0011] Furthermore, an elastic block is also provided inside the fixed cylinder. The elastic block is located on the side of the sealing plate away from the sealing disc, and plays a buffering role.

[0012] Furthermore, an exhaust pipe is fixedly connected to the side of the fixed cylinder away from the sealing ball, and the end of the exhaust pipe away from the fixed cylinder extends to the outer surface of the fixed column to balance the pressure inside the sealing cavity.

[0013] Compared with existing technologies, this gas valve leak-proof protection structure has the following advantages: I. This utility model installs a fixing column between the natural gas inlet pipe and the valve, connecting the natural gas inlet pipe and the valve through a threaded groove, connecting groove, venting groove and outlet pipe. A sealing structure and a driving structure are set inside the fixing column. In the event of a gas leak, the driving structure drives the sealing structure to seal the outlet of the natural gas inlet pipe, achieving a seal at the initial connection position. This solves the problem that traditional solenoid valve sealing methods can only seal the inside of the pipe connected to the output end of the solenoid valve. If the leak occurs at the connection between the outlet pipe of the natural gas main and the solenoid valve, it is difficult to achieve a seal to prevent gas leakage.

[0014] II. This utility model features a fixed cylinder and a sealing cavity that are both convex in shape, with a positioning block inside the fixed cylinder to limit the sealing plate, thereby controlling the sealing ball and preventing seal deviation. At the same time, sealing rings are provided on the outer sides of both the sealing plate and the sealing disc to form a sealed second chamber, which can provide a buffering effect while ensuring effective force transmission. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a longitudinal sectional view of the present invention; Figure 3 This is a cross-sectional view of the sealing component in this utility model.

[0016] In the diagram: 1. Fixed column; 2. Threaded groove; 3. Connecting groove; 4. Vent groove; 5. Air outlet pipe; 6. Electric push cylinder; 7. Sealing assembly; 71. Fixed cylinder; 72. Sealing disc; 73. Sealing cavity; 74. Exhaust pipe; 75. Positioning block; 76. Sealing plate; 77. Elastic block; 78. Connecting rod; 79. Sealing ball. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] like Figure 1-3 As shown, this utility model provides a technical solution: a gas valve leak-proof protection structure for natural gas, including a fixed column 1. The fixed column 1 has a connecting channel inside, and the two ends of the connecting channel are respectively connected to a natural gas inlet pipe and a natural gas valve, for connecting the natural gas inlet pipe and the natural gas valve; the connecting channel includes a threaded groove 2 opened at one end of the fixed column 1 and an outlet pipe 5 located at the other end of the fixed column 1, so that the threaded groove 2 and the outlet pipe 5 are respectively connected to the inlet pipe and the natural gas valve; a connecting groove 3 is connected to the side of the threaded groove 2 inside the fixed column 1, and the connecting groove 3 and the outlet pipe 5 are connected by a venting groove 4; a sealing component 7 is provided inside the connecting groove 3, and a driving structure is provided on one side of the sealing component 7, for driving the sealing component 7 to move towards the side of the threaded groove 2, so that the outlet of the inlet pipe is sealed by the sealing component 7, cutting off the gas source at the node of natural gas flow.

[0019] In the above embodiment, the fixed column 1 serves as the core load-bearing structure. The fixed column 1 is integrally welded to the gas outlet pipe 5 and is installed at the input end of the natural gas valve via a threaded seal on the gas outlet pipe 5. The fixed column 1 is also installed at the output end of the natural gas inlet pipe via a threaded seal on the threaded groove 2. Furthermore, it is internally connected to the gas outlet pipe via a connecting groove 3 and a venting groove 4, forming a complete channel for natural gas flow. The driving structure is an electric push cylinder 6, installed inside the fixed column 1. Its output end is connected to the sealing assembly 7. A controller is also connected to the fixed column 1 and to the electric push cylinder 6 to control its operation. When a gas leak occurs, the electric push cylinder 6 drives the sealing component 7 to move towards the inlet pipe until the sealing component 7 covers the outlet of the inlet pipe, forming a complete seal. This breaks the limitation of traditional solenoid valves that only seal the output pipe, and moves the sealing position forward to the initial connection between the inlet pipe and the protective structure, solving the leakage problem at the connection point and improving the overall gas leak prevention. Among them, the fixed column 1 is connected to the natural gas inlet pipe and the natural gas outlet pipe 5 to the natural gas valve through the threaded groove 2. This not only makes installation and disassembly convenient, but also achieves a preliminary seal through the threaded fit, reducing the risk of gas leakage at the connection point.

[0020] The sealing assembly 7 includes a transmission structure installed inside the fixed column 1. One side of the transmission structure is connected to the drive structure, and the other side of the transmission structure is connected to a sealing ball 79. The sealing ball 79 is located inside the communicating groove 3, and the center of the sealing ball 79 is located on the axis of the threaded groove 2. The sealing ball 79 is a silicone ball, and the diameter of the sealing ball 79 is larger than the inner diameter of the natural gas inlet pipe.

[0021] In the above embodiment, the diameter of the sealing ball 79 is larger than the inner diameter of the natural gas inlet pipe, ensuring that it completely covers the outlet of the inlet pipe when it abuts against the end face of the connecting groove 3, forming a complete seal and preventing gas leakage from the edges. The silicone sealing ball 79 has good elasticity and sealing performance. When it comes into contact with the end face of the connecting groove 3, it can fill tiny gaps through deformation, further improving the sealing effect. At the same time, silicone is resistant to gas corrosion and can maintain its sealing performance for a long time, adapting to the natural gas usage environment.

[0022] The transmission structure includes a fixed cylinder 71 fixedly connected inside the fixed column 1. The fixed cylinder 71 has a sealing cavity 73 inside. A sealing disc 72 and a sealing plate 76 are slidably connected to the inner wall of the sealing cavity 73. A connecting rod 78 is fixedly connected to the center of the side surface of the sealing plate 76 away from the sealing disc 72. The end of the connecting rod 78 away from the sealing plate 76 passes through one side of the fixed cylinder 71 and extends into the interior of the connecting groove 3. The end of the connecting rod 78 inside the connecting groove 3 is fixedly connected to the sealing ball 79. The output end of the drive structure passes through one side of the fixed cylinder 71, and the output end of the drive structure inside the fixed cylinder 71 is fixedly connected to the center of the surface of the sealing disc 72.

[0023] In the above embodiment, the fixed column 1 has a first chamber inside, and the electric push cylinder 6 and the fixed cylinder 71 are respectively fixedly installed inside the first chamber. The fixed cylinder 71 provides sliding space for the sealing disc 72 and the sealing plate 76, and a sealed second chamber is formed by the inner walls of the sealing disc 72, the sealing plate 76 and the fixed cylinder 71. Then, when the electric push cylinder 6 drives the sealing disc 72 to move to the left, the pressure inside the second chamber increases, which further drives the sealing plate 76 to move to the left. The sealing plate 76 drives the sealing ball 79 to move through the connecting rod 78, so that the sealing ball 79 abuts against the end face of the connecting groove 3 and covers the air outlet of the air inlet pipe, thus completing the sealing effect. The output end of the electric push cylinder 6 extends directly into the interior of the fixed cylinder 71 and is fixedly connected to the sealing disc 72, so as to more accurately control the moving distance of the sealing disc 72, thereby ensuring the sealing accuracy of the sealing ball 79. The second chamber enables the belt drive force between the sealing disc 72 and the sealing plate 76, which ensures the effective transmission of force while buffering the impact between the two and avoiding component wear caused by rigid contact.

[0024] The cross-sectional shape of the fixed cylinder 71 and the sealing cavity 73 is a horizontal convex shape, and the sealing disc 72 is located on the side with a larger diameter, while the sealing plate 76 is located on the side with a smaller diameter; both the sealing disc 72 and the sealing plate 76 are provided with sealing rings on their outer sides.

[0025] In use, the sealing disc 72 and the sealing plate 76 are located at different diameter sections of the convex shape of the fixed cylinder 71, thereby making the second chamber also form a convex shape. This enhances the pressure control capability of the sealing cavity 73 by forming a stepped sealing space. At the same time, the sealing ring between the sealing disc 72 and the sealing plate 76 and the fixed cylinder 71 further fills the gap with the inner wall of the fixed cylinder 71, providing double protection for the airtightness of the sealing cavity 73 and ensuring that the electric push cylinder 6 can effectively drive the sealing ball 79 to complete the sealing action.

[0026] A positioning block 75 is fixedly connected to the inner wall of the fixed cylinder 71. The positioning block 75 is located at the end of the smaller diameter part of the U-shaped part of the fixed cylinder 71 and plays a role in limiting the sealing plate 76. In use, the positioning block 75 is annular in shape, and the middle of the annulus facilitates the connection between the two sides. It is used to restrict the sealing plate 76 from sliding back and forth in the smaller diameter part and prevent the sealing plate 76 from leaving the sliding area.

[0027] The fixed cylinder 71 is also provided with an elastic block 77. The elastic block 77 is located on the side of the sealing plate 76 away from the sealing disc 72, and plays a buffering role. In use, the elastic block 77 is a silicone rod. The elastic block 77 is located on the left side of the sealing plate 76, which provides a buffering effect for the movement of the sealing plate 76 and avoids damage to the sealing components.

[0028] An exhaust pipe 74 is fixedly connected to the side of the fixed cylinder 71 away from the sealing ball 79. The end of the exhaust pipe 74 away from the fixed cylinder 71 extends to the outer surface of the fixed column 1 to balance the internal pressure of the sealing cavity 73.

[0029] When a gas leak occurs, the electric push cylinder 6 is activated, causing the sealing disc 72 to slide to the left. Since the sealing disc 72 and the sealing plate 76 are in a sealed second chamber, the pressure between them increases, which in turn pushes the sealing plate 76 to slide to the left as well. This, in turn, pushes the sealing ball 79 to slide to the left, so that the outer surface of the sealing ball 79 abuts against the end of the connecting groove 3, covering the gas outlet of the inlet pipe, thus achieving a seal from the initial position of the gas pipeline connection. After the maintenance personnel have finished dealing with the gas leak, the electric push cylinder 6 is activated again, causing the sealing disc 72 to slide to the right. The pressure between the sealing disc 72 and the sealing plate 76 decreases, which in turn pulls the sealing plate 76 to slide to the right as well. This moves the sealing ball 79 away from the end face of the connecting groove 3, allowing the natural gas inlet pipe to reconnect with the inside of the connecting groove 3, enabling normal operation.

Claims

1. A gas leakage prevention protection structure for a natural gas valve, characterized in that: Includes a fixed column (1), the fixed column (1) has a connecting channel inside, the two ends of the connecting channel are respectively connected to a natural gas inlet pipe and a natural gas valve, for connecting the natural gas inlet pipe and the natural gas valve; The connecting channel includes a threaded groove (2) at one end of the fixed column (1) and an outlet pipe (5) at the other end of the fixed column (1), so that the threaded groove (2) and the outlet pipe (5) are connected to the inlet pipe and the natural gas valve respectively. The threaded groove (2) is connected to a connecting groove (3) on one side inside the fixed column (1), and the connecting groove (3) and the outlet pipe (5) are connected by a ventilation groove (4). The interior of the connecting groove (3) is provided with a sealing component (7), and a driving structure is provided on one side of the sealing component (7) for driving the sealing component (7) to move toward one side of the threaded groove (2) so as to seal the outlet of the inlet pipe through the sealing component (7) and cut off the gas source at the node of natural gas flow. The sealing assembly (7) includes a transmission structure installed inside the fixed column (1). One side of the transmission structure is connected to the drive structure, and the other side of the transmission structure is connected to a sealing ball (79). The sealing ball (79) is disposed inside the communicating groove (3), and the center of the sealing ball (79) is located on the axis of the threaded groove (2). The sealing ball (79) is a silicone ball, and the diameter of the sealing ball (79) is larger than the inner diameter of the natural gas inlet pipe; The transmission structure includes a fixed cylinder (71) fixedly connected inside the fixed column (1). The fixed cylinder (71) has a sealing cavity (73) inside. The inner wall of the sealing cavity (73) is slidably connected to a sealing disc (72) and a sealing plate (76). A connecting rod (78) is fixedly connected to the center of the side surface of the sealing plate (76) away from the sealing disc (72). One end of the connecting rod (78) away from the sealing plate (76) passes through one side of the fixed cylinder (71) and extends into the inside of the connecting groove (3). One end of the connecting rod (78) inside the connecting groove (3) is fixedly connected to a sealing ball (79). The output end of the drive structure passes through one side of the fixed cylinder (71), and the output end of the drive structure located inside the fixed cylinder (71) is fixedly connected to the center of the surface of the sealing disc (72).

2. The gas leakage prevention protection structure for natural gas valves according to claim 1, characterized in that: The cross-sectional shape of the fixed cylinder (71) and the sealing cavity (73) is a horizontal convex shape, and the sealing disc (72) is located on the side with a larger diameter, while the sealing plate (76) is located on the side with a smaller diameter. Both the sealing disc (72) and the sealing plate (76) are provided with sealing rings on their outer sides.

3. The gas leakage prevention protection structure for natural gas valves according to claim 1, characterized in that: A positioning block (75) is fixedly connected to the inner wall of the fixed cylinder (71). The positioning block (75) is located at the end of the convex-shaped smaller diameter part of the fixed cylinder (71) and plays a limiting role for the sealing plate (76).

4. The gas leakage prevention protection structure for natural gas valves according to claim 1, characterized in that: The fixed cylinder (71) is also provided with an elastic block (77), which is located on the side of the sealing plate (76) away from the sealing disk (72) and plays a buffering role.

5. The gas leakage prevention protection structure for natural gas valves according to claim 1, characterized in that: The side of the fixed cylinder (71) away from the sealing ball (79) is fixedly connected to an exhaust pipe (74), and the end of the exhaust pipe (74) away from the fixed cylinder (71) extends to the outer surface of the fixed column (1) to balance the pressure inside the sealing cavity.

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