Leak-proof gas pipeline self-closing valve

Abstract

The leakproof gas pipeline self-closing valve comprises a valve body, the valve body comprises a shell, an underpressure opening is fixedly connected to the front face of the shell, a high-pressure opening is fixedly connected to the surface of the shell, a sealing strip is fixedly connected to the interior of the shell, and a valve element is slidably connected to the interior of the sealing strip; a front cleaning frame is fixedly connected to the front face of the valve element, a round blind hole is fixedly connected to the top of the valve element, the valve element is slidably connected with an on-off column through the round blind hole in the top, a firing pin is fixedly connected to the back face of the valve element, a scraper is fixedly connected to the surface of the firing pin, and a pin frame is fixedly connected to the interior of the valve body. According to the self-closing valve, introduced natural gas is used for assisting the limiting column to move, meanwhile, the cleaning mechanism matched with the valve element is used, the reliability of the valve is improved, and the probability of natural gas safety accidents is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gas safety devices, in particular to a leakage-proof gas pipeline self-closing valve. Background Art

[0002] Gas pipeline self-closing valve is a device installed on the pipeline of low-pressure gas system. When the pipeline gas supply pressure is under-pressure or over-pressure, it can automatically close without electricity or other external power and needs to be opened manually. In the natural gas transmission pipeline, the self-closing valves at the user end often cause some of their components to fail due to long-term use, which in turn affects the safety of indoor natural gas use and even the occurrence of natural gas safety accidents. Therefore, it is very important to reduce the probability of failure of the self-closing valves. Summary of the invention

[0003] The purpose of the present invention is to provide a leakage-proof gas pipeline self-closing valve to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a self-closing valve for leak-proof gas pipeline, comprising a valve body, the valve body is made of metal, the valve body comprises a shell, an underpressure port is fixedly connected to the front of the shell, a high-pressure port is fixedly connected to the surface of the shell, a seal is fixedly connected to the inside of the shell, the seal is made of rubber, a valve core is slidably connected to the inside of the seal, a front cleaning frame is fixedly connected to the front of the valve core, a circular blind hole is fixedly connected to the top of the valve core, the valve core is slidably connected to an on-off column through the circular blind hole on the top, a striker is fixedly connected to the back of the valve core, the striker is made of metal, a scraper is fixedly connected to the surface of the striker, the scraper is made of polymer, a needle holder is fixedly connected to the inside of the valve body, the front of the needle holder is slidably connected to the striker, and a safety valve is fixedly connected to the back of the valve body, providing an overall technical solution of the present invention, using an on-off mechanism in conjunction with a shell to realize over-pressure and low-pressure protection of natural gas, using natural gas to assist the on-off mechanism to act, and using a cleaning mechanism to clean the active contact part of the on-off mechanism, thereby improving the working reliability of the self-closing valve and thus improving the safety of using natural gas.

[0005] Preferably, the underpressure port is connected to an air inlet connector on the front side, a thread is fixedly connected inside the air inlet connector, the material of the air inlet connector is metal, the back side of the shell is connected to an air outlet connector, the material of the air outlet connector is metal, the back side of the air outlet connector is connected to a hose interface, the material of the hose interface is metal, a circular through hole is fixedly connected to the top of the high-pressure port, the number of the circular through holes is two, and the other circular through hole is symmetrically distributed about the central axis of the valve body, the number of the seals is two, and they are symmetrically distributed about the central axis of the valve body, a technical solution for the connection part of the self-closing valve and the natural gas pipeline of the present invention is provided, and the connection method of the self-closing valve with the natural gas pipeline and the user end is clarified.

[0006] Preferably, the circular through hole at the top of the high-pressure port is slidably connected with a release switch, and the number of the release switches is two, which are symmetrically distributed about the central axis of the valve body. The release switch includes a connecting rod, the surface of the connecting rod is slidably connected to the through hole of the high-pressure port, the bottom of the connecting rod is fixedly connected to a bottom touch plate, the bottom surface of the bottom touch plate is covered with rubber, the front of the bottom touch plate is fixedly connected to a circular blind hole, the bottom touch plate is slidably connected to a sliding column through the circular blind hole, the sliding column is made of polymer, the back of the sliding column is fixedly connected to a spring, the back of the spring is fixedly connected to the circular blind hole of the bottom touch plate, the top of the connecting rod is fixedly connected to a top plate, and the surface of the connecting rod is slidably connected to a spring. A technical solution for the recovery mechanism after the self-closing valve triggers the overpressure protection is provided, and the cooperation of polymer components and metal components is utilized to reduce the possibility of sparks generated by friction between metal components to ignite natural gas, thereby improving the safety of the pipeline.

[0007] Preferably, a fixing ring is fixedly connected to the front of the needle holder, a needle tube is connected to the front of the needle holder, a brush plate is fixedly connected to the surface of the needle tube, four brush plates are arranged symmetrically about the central axis of the needle tube, and a technical solution for guiding and fixing the trigger mechanism of the safety mechanism in the present invention is provided.

[0008] Preferably, the valve core includes a cylinder, the valve core is made of metal, the surface of the cylinder is slidably connected to the seal, the front of the cylinder is connected to a circular through hole, the number of the circular through holes is two, and they are symmetrically distributed about the central axis of the cylinder, the back of the cylinder is fixedly connected to a card slot, the card slot is made of metal, the back of the cylinder is fixedly connected to a circular blind hole, the circular blind hole is connected to the circular through hole on the front of the cylinder, the inside of the circular blind hole on the back of the cylinder is fixedly connected to a striker, the inside of the circular through hole on the front of the cylinder is connected to a power-assisting airway, and the power-assisting airway is connected to the circular blind hole on the top of the valve core The assist air duct is connected with the circular blind hole at the bottom of the valve core, a cleaning block is fixedly connected to the surface of the front cleaning frame, the cleaning block is made of elastic material, the circular blind hole at the top of the valve core is connected with the circular through hole on the front of the on-off column, the circular blind hole at the bottom of the valve core is connected with the circular through hole on the front of the on-off column, the surface of the striker is covered with a rubber layer, the surface of the scraper is fixedly connected with a scraper frame, there are four scraper frames, which are symmetrically distributed about the central axis of the striker, a technical solution for the valve core body structure of the present invention is provided, and the matching relationship between the valve core body and the limiting mechanism is clarified.

[0009] Preferably, a spring is fixedly connected to the bottom of the on-off column, and the bottom of the spring is fixedly connected to the inside of the blind hole at the top of the valve core. The on-off column includes a sliding column, and the bottom of the sliding column is fixedly connected to the top of the spring. The top of the sliding column is fixedly connected to a connecting plate, and the number of the connecting plates is two, which are symmetrically distributed about the central axis of the sliding column. A roller is rotatably connected to one side of the power-assisting airway, and the roller is made of a polymer. There are four circular blind holes on the top of the valve core, two of which are in a group, for a total of two groups, one of which is located at the top of the valve core and the other is located at the bottom of the valve core. The two groups of blind holes are symmetrically distributed about the central axis of the valve core. There are four on-off columns, and their positions correspond to the circular blind holes at the top and bottom of the valve core, providing a supplementary solution to the matching relationship between the valve core body structure and the limiting mechanism of the present invention.

[0010] Preferably, the safety valve includes an opening plate, the opening plate is made of metal, a rectangular through hole is fixedly connected to the front of the opening plate, the number of the rectangular through holes is two, and they are symmetrically distributed about the central axis of the opening plate, the bottom of the rectangular through hole of the opening plate is connected to a rectangular blind hole, the bottom of the rectangular blind hole of the opening plate is connected to a circular through hole, the center of the circular through hole at the bottom of the rectangular blind hole of the opening plate is connected to a rectangular hole, and an opening slide plate is slidably connected inside the opening plate, providing a technical solution for the safety mechanism of the present invention.

[0011] Preferably, the opening slide plate includes a baffle plate, the baffle plate is made of polymer, the baffle plate is slidably connected to a rectangular blind hole connected to the bottom of the rectangular through hole of the opening plate, the top of the baffle plate is fixedly connected to a rubber layer, the bottom of the baffle plate is fixedly connected to a connecting column, the bottom of the connecting column is fixedly connected to a limiting plate, the top of the limiting plate is fixedly connected to a spring, there are two springs distributed on both sides of the top of the limiting plate, the top of the spring is fixedly connected to the top of the rectangular hole inside the opening plate, there are four opening slide plates, which are symmetrically distributed about the central axis of the opening plate, a supplementary solution to the technical solution of the insurance mechanism of the present invention is provided, and the structure of the actuator in the insurance mechanism is clarified.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The anti-leakage gas pipeline self-closing valve utilizes a sliding valve core with a limit post to slide under the action of natural gas pressure, and activates the limit post when the natural gas pressure is too high or too low, thereby closing the valve core, and then closing the user end and the transmission end of the natural gas pipeline, reducing the probability of natural gas safety accidents and improving the safety of using natural gas; The leak-proof gas pipeline self-closing valve uses a booster airway in a sliding valve core to assist the movement of a limit column with the introduced natural gas, thereby preventing the limit column and the spring from failing due to long-term use, thereby improving the reliability of the valve, thereby improving the safety of using natural gas and reducing the probability of natural gas safety accidents. The leak-proof gas pipeline self-closing valve utilizes a safety mechanism that cooperates with a sliding valve core. When the natural gas pressure is too high, the striker of the valve core activates the safety valve, thereby closing the connection between the entire valve core and the user end, improving the sealing performance of the natural gas and the protection capability of the user end, further reducing the probability of natural gas safety accidents, and improving the reliability of the valve. At the same time, the contact surface of the active part of the self-closing valve is covered with a rubber layer to reduce the wear of the parts, reduce the probability of sparks generated by friction of metal parts to ignite natural gas within a certain range, and improve the safety of using natural gas; This anti-leakage gas pipeline self-closing valve utilizes a cleaning mechanism that cooperates with the valve core to clean the active surface in contact with the valve core under the drive of natural gas pressure, thereby reducing the probability of the valve core being blocked by fine impurities entrained in the natural gas, achieving self-cleaning inside the valve core, improving the reliability of the self-closing valve, and further reducing the probability of natural gas accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall internal cross-section of the present invention; Figure 3 It is a schematic diagram of the position relationship between the column and the seal of the present invention; Figure 4 This is a schematic diagram of the overall structure of the on-off column of the present invention; Figure 5 This is a schematic diagram of the position relationship between the release switch and the housing of the present invention; Figure 6 This is a schematic diagram of the overall structure of the release switch of the present invention; Figure 7 It is a schematic cross-sectional view of the opening plate structure of the present invention; Figure 8 It is a schematic diagram of the overall structure of the opening slide plate of the present invention.

[0014] In the figure: 1. valve body; 10. shell; 101. underpressure port; 102. high pressure port; 11. air inlet connector; 12. air outlet connector; 121. hose connector; 13. seal; 14. needle holder; 141. fixing ring; 142. needle tube; 143. brush plate; 15. release switch; 151. bottom touch plate; 152. sliding column; 153. connecting rod; 154. top plate; 2. valve core; 21. column body; 211, power-assist airway; 212, slot; 213, striker; 214, scraper frame; 215, scraper; 216, front cleaning frame; 217, cleaning block; 22, on-off column; 221, sliding column; 222, connecting plate; 223, roller; 3, safety valve; 31, opening plate; 32, opening slide plate; 321, baffle; 322, connecting column; 323, limit plate; 324, rubber layer. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1-8The present invention provides a technical solution: a self-closing valve for leak-proof gas pipeline, comprising a valve body 1, the valve body 1 is made of metal and is the main structure of the self-closing valve, the valve body 1 comprises a shell 10, which is used to accommodate the natural gas transmitted into the self-closing valve and other internal mechanisms, the front of the shell 10 is fixedly connected with an underpressure port 101, which is used to cooperate with the valve core 2 to automatically fix the valve core 2 when the natural gas is underpressure, the back of the underpressure port 101 is an inclined surface, the front of the underpressure port 101 is connected with an air inlet joint 11, which is used to connect the self-closing valve and the natural gas pipeline, the air inlet joint 11 is fixedly connected with a thread inside for threaded connection, the air inlet joint 11 is made of metal, and the back of the shell 10 is connected with an air outlet joint 12, which is used to connect the valve body 1 with the gas at the user end. Pipeline, the gas outlet joint 12 is made of metal, and the back of the gas outlet joint 12 is connected to a hose interface 121 for docking with the gas pipe at the user end. The hose interface 121 is made of metal. The surface of the shell 10 is fixedly connected with a high-pressure port 102, which is used to cooperate with the valve core 2 to complete the protection of the user end when the natural gas is over-pressured, thereby reducing the probability of natural gas use accidents. A circular through hole is fixedly connected to the top of the high-pressure port 102, and the number of the circular through holes is two. The other circular through hole is symmetrically distributed about the central axis of the valve body 1. The front of the high-pressure port 102 is an inclined surface. A seal 13 is fixedly connected to the inside of the shell 10 for increasing the sealing inside the valve. The seal 13 is made of rubber, and the number of the seals 13 is two, which are symmetrically distributed about the central axis of the valve body 1. A needle holder 14 is fixedly connected inside the valve body 1 for guiding and fixing the striker 213. A fixing ring 141 is fixedly connected to the front of the needle holder 14 for fixing the spring. A needle tube 142 is connected to the front of the needle holder 14 for guiding the striker 213 and providing space for the installation of a brush plate 143. A brush plate 143 is fixedly connected to the surface of the needle tube 142 for cleaning impurities attached to the surface of the blind hole on the back of the valve core 2, reducing the adverse effects of impurities on the self-closing valve, thereby improving the reliability of the self-closing valve. There are four brush plates 143. The circular through hole at the top of the high-pressure port 102 is slidably connected with a release switch 15, which is used to restore the normal state of the self-closing valve after the self-closing valve triggers the overpressure protection. The number of release switches 15 is two, which are symmetrically distributed about the central axis of the valve body 1. The release switch 15 includes a connecting rod 153, which is used to connect the bottom touch plate 151 and the top plate 154. The surface of the connecting rod 153 is slidably connected to the through hole of the high-pressure port 102, and the bottom of the connecting rod 153 is fixedly connected with the bottom touch plate 151, which is used to contact the on-off column 22 to assist in releasing the switch 15. To reset the on-off column 22, the bottom surface of the bottom touch plate 151 is covered with rubber, a circular blind hole is fixedly connected to the front of the bottom touch plate 151, the bottom touch plate 151 is slidably connected to the sliding column 152 through the circular blind hole, the sliding column 152 is made of polymer, a spring is fixedly connected to the back of the sliding column 152, the back of the spring is fixedly connected to the circular blind hole of the bottom touch plate 151, the top of the connecting rod 153 is fixedly connected to the top plate 154, and the surface of the connecting rod 153 is slidably connected to the spring for resetting after pressing the top plate 154; The seal 13 is internally slidably connected with a valve core 2, which is used to transmit the transported natural gas and cooperate with the limit mechanism to protect the user-end gas pipeline. The valve core 2 is made of metal. The valve core 2 includes a column 21, which is the main body of the valve core 2. The surface of the column 21 is slidably connected to the seal 13. The front of the column 21 is connected with a circular through hole. The number of the circular through holes is two and is symmetrically distributed about the central axis of the column 21. The back of the column 21 is fixedly connected with a circular blind hole, which is connected to the circular through hole on the front of the column 21. The inside of the circular blind hole on the back of the column 21 is fixedly connected with a striker 213. The striker 2 The surface of 13 is covered with a rubber layer, which is used to trigger the safety valve 3. The circular through hole on the front of the column 21 is connected with an assisting air channel 211, which is used to guide natural gas into the bottom of the on-off column 22 to assist the movement of the on-off column 22. The assisting air channel 211 is connected with the circular blind hole on the top of the valve core 2, and the assisting air channel 211 is connected with the circular blind hole at the bottom of the valve core 2. The circular blind hole on the top of the valve core 2 is connected with the circular through hole on the front of the on-off column 22, and the circular blind hole at the bottom of the valve core 2 is connected with the circular through hole on the front of the on-off column 22. The back of the column 21 is fixedly connected with a card slot 212, and the card slot 212 is made of gold. The scraper 215 is fixedly connected to a scraper frame 214 on the surface. There are four scraper frames 214, which are symmetrically distributed about the central axis of the striker 213. The front of the valve core 2 is fixedly connected to a front cleaning frame 216. The surface of the front cleaning frame 216 is fixedly connected to a cleaning block 217. The cleaning block 217 is made of elastic material and is used to squeeze the surface of the seal 13 to cover the contact area between the column 21 and the seal 13, and move with the column 21 to clean. The top of the valve core 2 is fixedly connected to a circular blind hole. The valve core 2 is slidably connected to a switch column 22 through the circular blind hole on the top to cooperate with the underpressure port 101 and the high-pressure port 102 are under-pressure or over-pressure protected. A striker 213 is fixedly connected to the back of the valve core 2. The striker 213 is made of metal. The surface of the striker 213 is covered with a rubber layer. The top of the striker 213 is fixedly connected with a chamfer, which is used to trigger the safety valve 3 to perform over-pressure protection, thereby improving the safety and reliability of the self-closing valve. A scraper 215 is fixedly connected to the surface of the striker 213, which is used to clean impurities in the housing 10 during the movement of the striker 213, reducing the possibility of clogging of the self-closing valve. The scraper 215 is made of polymer, and the front of the needle holder 14 is slidably connected to the striker 213; A spring is fixedly connected to the bottom of the on-off column 22, and the bottom of the spring is fixedly connected to the inside of the blind hole at the top of the valve core 2. The on-off column 22 includes a sliding column 221, which is the main body of the on-off column 22. The front of the sliding column 221 is connected to a circular through hole, the size of which is consistent with the circular through hole on the front of the column body 21. The bottom of the sliding column 221 is fixedly connected to the top of the spring, and the top of the sliding column 221 is fixedly connected to a connecting plate 222 for fixing the position of the roller 223. There are two connecting plates 222, which are symmetrically distributed about the central axis of the sliding column 221. One side of the power-assisting airway 211 is rotatably connected to a roller 223. The material of the roller 223 is a polymer, which is used to assist in the execution of the action of the on-off column 22 and reduce the friction loss with the bottom touch plate 151. There are four circular blind holes in the top of the valve core 2, two of which are in a group, with a total of two groups, one of which is located at the top of the valve core 2 and the other is located at the bottom of the valve core 2. The two groups of blind holes are symmetrically distributed about the central axis of the valve core 2. There are four on-off columns 22, and their positions correspond to the circular blind holes at the top and bottom of the valve core 2. A safety valve 3 is fixedly connected to the back of the valve body 1, which is used to assist the valve core 2 in sealing the self-closing valve when the natural gas is over-pressured. The safety valve 3 includes an opening plate 31, which is the main body of the safety valve 3. The opening plate 31 is made of metal. A rectangular through hole is fixedly connected to the front of the opening plate 31. The number of rectangular through holes is two, which are symmetrically distributed about the central axis of the opening plate 31. The bottom of the rectangular through hole of the opening plate 31 is connected with a rectangular blind hole, and the bottom of the rectangular blind hole of the opening plate 31 is connected with a circular through hole. The center of the circular through hole at the bottom of the rectangular blind hole of the opening plate 31 is connected with a rectangular hole. An opening slide plate 32 is slidably connected inside the opening plate 31, which is used to close the safety valve 3 with the cooperation of the striker 213. The opening slide plate 32 includes a baffle plate 321, which is made of polymer. The baffle plate 321 is slidably connected to a rectangular blind hole that is connected to the bottom of the rectangular through hole of the opening plate 31. A rubber layer 324 is fixedly connected to the top of the baffle plate 321, and a connecting column 322 is fixedly connected to the bottom of the baffle plate 321. The bottom of the connecting column 322 is fixedly connected to a chamfer. The bottom of the connecting column 322 is fixedly connected to a limiting plate 323, and the top of the limiting plate 323 is fixedly connected to a spring. There are two springs distributed on both sides of the top of the limiting plate 323. The top of the spring is fixedly connected to the top of the rectangular hole inside the opening plate 31. There are four opening slide plates 32, which are symmetrically distributed about the central axis of the opening plate 31.

[0017] Working principle: The self-closing valve is connected to the delivery end of the natural gas pipeline through the air inlet joint 11, and connected to the delivery hose at the user end through the hose interface 121, and the connection is completed. Under normal circumstances, natural gas enters the self-closing valve from the air inlet joint 11, and then passes through the valve core 2, and the natural gas enters from the circular through hole on the front of the column 21, and then leaves the column 21 from the circular through hole at the rear, and then leaves the self-closing valve through the rectangular through hole on the front of the opening plate 31 and enters the gas pipeline at the user end; When the natural gas pipeline is under-pressured, the natural gas pressure in the pipeline drops, and the valve core 2 slides forward under the influence of the natural gas under-pressure, stretching the spring fixedly connected to the valve core 2 at the same time, until the on-off column 22 close to the front side of the valve core 2 slides with the valve core 2 to just below the under-pressure port 101, and the on-off column 22 slides upward under the thrust of the spring until the roller 223 on the top of the on-off column 22 contacts the bottom of the under-pressure port 101, and the circular through hole on the front side of the slide column 221 moves upward with the slide column 221. When the movement is completed, the through hole and the column 2 1, the circular through holes on the front side are completely staggered, thereby realizing the closing of the self-closing valve. When the natural gas pipeline pressure gradually returns to normal, the valve core 2 slides backward under the influence of the increased natural gas pressure and the spring tension. At this time, the on-off column 22 slides with the valve core 2, and the roller 223 rolls in contact with the inclined surface of the under-pressure port 101, driving the on-off column 22 to slide downward, squeezing the spring until the on-off column 22 completely leaves the under-pressure port 101 driven by the column 21, and the circular through hole on the front side of the valve core 2 is connected again, and the gas supply is restored; When overpressure occurs in the natural gas pipeline, due to the excessive natural gas pressure, the valve core 2 moves backward under the influence of the natural gas pressure, squeezing the spring behind the valve core 2 at the same time. When the on-off column 22 close to the back of the valve core 2 moves to just below the high-pressure port 102, the on-off column 22 moves upward under the influence of the spring thrust until the roller 223 contacts the rubber layer at the bottom of the bottom touch plate 151, and the through hole on the front of the column 21 is blocked, and the gas supply is terminated. At the same time, the striker 213 moves backward with the valve core 2 under the guidance of the needle holder 14. When the chamfered part of the other end of the striker 213 passes through the circular through hole on the front of the opening plate 31, the other end of the striker 213 hits the chamfer at the bottom of the connecting column 322, thereby pushing the opening slide plate 32 to slide along the circular through hole and the rectangular through hole inside the opening plate 31 until the rubber layer 324 contacts the top of the rectangular through hole on the front of the opening plate 31, completing the closing of the safety valve 3, thereby improving The sealing performance of the self-closing valve is improved. When the pressure of the natural gas pipeline returns to the normal range, the personnel press the top plate 154, and the top plate 154 drives the connecting rod 153 to slide downward, and the connecting rod 153 drives the bottom touch plate 151 to slide downward, and the bottom touch plate 151 drives the sliding column 152 to slide downward together. At this time, the sliding column 152 moves forward under the action of the spring reasoning, extending the contact area with the roller 223, and the bottom of the bottom touch plate 151 contacts the roller 223, driving the roller 223 to slide downward, and the roller 223 drives the on-off column 22 to slide downward until the on-off column 22 is reset. The limit of the forward movement of the valve core 2 is completely released, and the valve core 2 moves forward under the action of the spring thrust. The on-off column 22 is restored to its original position, so that the front through hole of the column 21 is restored to communication. At the same time, because the striker 213 is reset under the drive of the valve core 2, the opening slide plate 32 is also reset immediately, and the insurance valve 3 is restored to open. At this point, the self-closing valve is restored to communication; When the natural gas enters the self-closing valve along the through hole on the front of the column 21, a part of the gas flows to the bottom of the on-off column 22 through the auxiliary gas channel 211, exerting axial pressure on the bottom of the on-off column 22. If the spring at the bottom of the on-off column 22 loses its efficiency due to long-term use, resulting in the on-off column 22 being unable to be fully pushed, then when overpressure or underpressure protection is performed, the gas pressure on the on-off column 22 will assist the on-off column 22 to move upward, preventing the spring efficiency from being reduced, resulting in a reduction in the protection effect of the self-closing valve; Because the gas pressure of natural gas in a normal state is not a stable value, under normal conditions, the natural gas pressure will affect the movement state of the valve core 2, allowing the valve core 2 to slide within a range that does not trigger the protection function. During the sliding process of the column 21, the front cleaning frame 216 on the front side of the column 21 drives the cleaning block 217 to slide together to clean up possible tiny solid impurities within the movable range of the contact surface between the valve core 2 and the seal 13 to prevent them from jamming the valve core 2. At the same time, the brush plate 143 slides relative to the inner wall of the circular blind hole behind the valve core 2 to clean up possible impurities in the blind hole to prevent them from affecting the gas supply and causing the self-closing valve to malfunction.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-closing valve for leak-proof gas pipeline, comprising a valve body (1), characterized in that: The valve body (1) comprises a shell (10), the front of the shell (10) being fixedly connected with an underpressure port (101), the surface of the shell (10) being fixedly connected with a high-pressure port (102), the interior of the shell (10) being fixedly connected with a seal (13), the interior of the seal (13) being slidably connected with a valve core (2), the front of the valve core (2) being fixedly connected with a front cleaning frame (216), the top of the valve core (2) being fixedly connected with a circular blind hole, the valve core (2) being slidably connected with a switch column (22) through the circular blind hole at the top, the back of the valve core (2) being fixedly connected with a striker (213), the surface of the striker (213) being fixedly connected with a scraper (215), the interior of the valve body (1) being fixedly connected with a needle holder (14), the front of the needle holder (14) being slidably connected with the striker (213), and the back of the valve body (1) being fixedly connected with a safety valve (3).

2. The anti-leakage gas pipeline self-closing valve according to claim 1, characterized in that: The underpressure port (101) is connected to an air inlet connector (11) on the front side, and a thread is fixedly connected to the inside of the air inlet connector (11). The shell (10) is connected to an air outlet connector (12) on the back side, and a hose interface (121) is connected to the back side of the air outlet connector (12). The top of the high-pressure port (102) is fixedly connected to a circular through hole, and the number of the circular through holes is two, and the other circular through hole is symmetrically distributed about the central axis of the valve body (1). The number of the sealing strips (13) is two, and they are symmetrically distributed about the central axis of the valve body (1).

3. The anti-leakage gas pipeline self-closing valve according to claim 2 is characterized in that: The circular through hole at the top of the high-pressure port (102) is slidably connected to a release switch (15). The number of the release switches (15) is two and they are symmetrically distributed about the central axis of the valve body (1). The release switch (15) comprises a connecting rod (153). The surface of the connecting rod (153) is slidably connected to the through hole of the high-pressure port (102). The bottom of the connecting rod (153) is fixedly connected to a bottom touch plate (151). The front of the bottom touch plate (151) is fixedly connected to a circular blind hole. The bottom touch plate (151) is slidably connected to a sliding column (152) through the circular blind hole. The back of the sliding column (152) is fixedly connected to a spring. The back of the spring is fixedly connected to the circular blind hole of the bottom touch plate (151). The top of the connecting rod (153) is fixedly connected to a top plate (154). The surface of the connecting rod (153) is slidably connected to a spring.

4. The anti-leakage gas pipeline self-closing valve according to claim 3, characterized in that: The front side of the needle rack (14) is fixedly connected to a fixing ring (141), the front side of the needle rack (14) is connected to a needle tube (142), the surface of the needle tube (142) is fixedly connected to a brush plate (143), and the number of the brush plates (143) is four and they are symmetrically distributed about the central axis of the needle tube (142).

5. The anti-leakage gas pipeline self-closing valve according to claim 1, characterized in that: The valve core (2) comprises a column (21), the surface of the column (21) is slidably connected to the seal (13), the front of the column (21) is connected to a circular through hole, the number of the circular through holes is two and they are symmetrically distributed about the central axis of the column (21), the back of the column (21) is fixedly connected to a slot (212), the valve core (2) is fixedly connected to the inside of a fixing ring (141) via a spring fixedly connected to the slot (212), the back of the column (21) is fixedly connected to a circular blind hole, the circular blind hole is connected to the circular through hole on the front of the column (21), the inside of the circular blind hole on the back of the column (21) is fixedly connected to a striker (213), the inside of the circular through hole on the front of the column (21) is connected to a spring (212), and the inside of the circular through hole on the front of the column (21) is connected to a spring (212). A power-assisting air passage (211) is provided, the power-assisting air passage (211) is connected to a circular blind hole at the top of the valve core (2), the power-assisting air passage (211) is connected to a circular blind hole at the bottom of the valve core (2), a cleaning block (217) is fixedly connected to the surface of the front cleaning frame (216), the circular blind hole at the top of the valve core (2) is connected to a circular through hole at the front of the on-off column (22), the circular blind hole at the bottom of the valve core (2) is connected to a circular through hole at the front of the on-off column (22), the surface of the striker (213) is covered with a rubber layer, the surface of the scraper (215) is fixedly connected to a scraper frame (214), the number of the scraper frames (214) is four, and they are symmetrically distributed about the central axis of the striker (213).

6. The anti-leakage gas pipeline self-closing valve according to claim 5, characterized in that: The bottom of the on-off column (22) is fixedly connected to a spring, and the bottom of the spring is fixedly connected to the inside of the blind hole at the top of the valve core (2). The on-off column (22) comprises a sliding column (221), and the bottom of the sliding column (221) is fixedly connected to the top of the spring. The top of the sliding column (221) is fixedly connected to a connecting plate (222). The number of the connecting plates (222) is two and they are symmetrically distributed about the central axis of the sliding column (221). One side of the boosting airway (211) is rotatably connected to a roller (223). The number of the circular blind holes at the top of the valve core (2) is four, two in a group, for a total of two groups, one of which is located at the top of the valve core (2) and the other is located at the bottom of the valve core (2). The two groups of blind holes are symmetrically distributed about the central axis of the valve core (2). The number of the on-off columns (22) is four, and their positions correspond to the circular blind holes at the top and bottom of the valve core (2).

7. The anti-leakage gas pipeline self-closing valve according to claim 1, characterized in that: The safety valve (3) comprises an opening plate (31), the front face of the opening plate (31) being fixedly connected with a rectangular through hole, the number of the rectangular through holes being two and being symmetrically distributed about the central axis of the opening plate (31), the bottom of the rectangular through hole of the opening plate (31) being connected with a rectangular blind hole, the bottom of the rectangular blind hole of the opening plate (31) being connected with a circular through hole, the center of the circular through hole at the bottom of the rectangular blind hole of the opening plate (31) being connected with a rectangular hole, and the interior of the opening plate (31) being slidably connected with an opening slide plate (32).

8. The anti-leakage gas pipeline self-closing valve according to claim 7, characterized in that: The opening slide plate (32) comprises a baffle plate (321), the baffle plate (321) being slidably connected to a rectangular blind hole communicating with the bottom of a rectangular through hole of the opening plate (31), a rubber layer (324) being fixedly connected to the top of the baffle plate (321), a connecting column (322) being fixedly connected to the bottom of the baffle plate (321), a limiting plate (323) being fixedly connected to the bottom of the connecting column (322), a spring being fixedly connected to the top of the limiting plate (323), two springs being distributed on both sides of the top of the limiting plate (323), the top of the spring being fixedly connected to the top of the rectangular hole inside the opening plate (31), and four opening slide plates (32) being symmetrically distributed about the central axis of the opening plate (31).

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