Liquefied petroleum gas steel cylinder valve

Abstract

The invention discloses a liquefied petroleum gas steel cylinder valve, and relates to the technical field of petroleum gas stop valves. Comprising a valve body, a gas inlet pipe and a gas outlet pipe, the gas inlet pipe and the gas outlet pipe are fixedly communicated with the valve body, the gas inlet pipe is fixedly communicated with a liquefied petroleum gas steel cylinder, a gas blocking head is arranged in the gas inlet pipe, a through hole is formed in the middle of the gas blocking head, an overflowing blocking ball is placed in the gas inlet pipe on the gas inlet side of the gas blocking head, and the diameter of the through hole is smaller than that of the overflowing blocking ball. A reset assembly is arranged, under high pressure, if gas leakage is caused by poor sealing performance between a pressing rod and the side wall of the top inserting hole and between a sealing ring and the side wall of the top inserting hole, liquefied petroleum gas can enter a cavity, the pressing rod can move upwards along with increase of pressure in the cavity, at the moment, extrusion force between an inner extending plate and the sealing ring can be increased, and the sealing ring is prevented from being damaged. Liquefied petroleum gas can be effectively prevented from leaking into air, the sealing performance of the reset assembly is improved, and the use safety of the steel cylinder valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied petroleum gas cut-off valves, and specifically to a liquefied petroleum gas cylinder valve. Background Art

[0002] The liquefied petroleum gas cylinder valve is a key component connecting the cylinder and the using equipment, and its safety is directly related to the life and property safety of users.

[0003] Chinese invention patent, application publication number CN118793822A discloses an overcurrent cut-off valve for bottled liquefied petroleum gas cylinders. The right end of the cut-off valve has an air inlet, and the left end has an air outlet; an air transmission channel is provided inside the cut-off valve, and the air transmission channel includes an air inlet channel, an overcurrent chamber, a valve chamber, and an air outlet channel arranged in sequence from right to left; an overcurrent steel ball is provided in the overcurrent chamber, and the overcurrent steel ball is reset by a reset button; an air valve core blocking the valve chamber is provided in the valve chamber, and the air valve core is driven by a coil. This overcurrent cut-off valve has an overcurrent automatic cut-off function, and also integrally integrates a fault self-feedback solenoid valve, and improves the feedback stability through a five-core wire.

[0004] Another example is that Chinese invention patent, application publication number CN117469438A discloses a manually pressed and reset overcurrent cut-off liquefied petroleum gas cylinder valve, belonging to the technical field of cylinder valves. When gas leakage occurs, the floating steel ball of the overcurrent cut-off valve is impacted by the medium, and the overcurrent cut-off air outlet of the overcurrent cut-off valve is closed by the seat sealing gasket of the overcurrent cut-off valve. Press the cover body of the overcurrent cut-off valve, and the elastic rod body of the overcurrent cut-off valve slides in the manually pressed and reset component of the overcurrent cut-off valve to extrude the floating steel ball of the overcurrent cut-off valve, so that the floating steel ball of the overcurrent cut-off valve is quickly reset to complete the normal operation of the present invention. The present invention adds an overcurrent protection structure at the air outlet position, supplements the product safety protection function, and pressing the cover body of the overcurrent cut-off valve can quickly reset the present invention, with simple operation and strong practicability.

[0005] The above solutions have all solved the problem of overcurrent protection for liquefied petroleum gas cylinders. However, in actual applications, there are still certain defects in the existing technologies and overcurrent protection valves circulating in the existing market: For example, since the reset component for resetting the blocking ball is arranged on the high-pressure inlet pipe side, pressing the reset component multiple times may reduce the sealing performance of the reset component, resulting in leakage of high-pressure liquefied petroleum gas at the reset component. In addition, to improve the sealing effect, the air blocking head for blocking is generally made of rubber material. After using the liquefied petroleum gas cylinder for a long time, due to possible cracks in the rubber material caused by aging, and impurities in the liquefied petroleum gas will adhere to the outer surfaces of the air blocking head and the anti-leakage blocking ball, thereby reducing the sealing performance between the air blocking head and the anti-leakage blocking ball, resulting in leakage of liquefied petroleum gas. Summary of the Invention

[0006] The object of the present invention is to provide a liquefied petroleum gas cylinder valve to solve the problems raised in the above-mentioned background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A liquefied petroleum gas cylinder valve includes a valve body, an inlet pipe and an outlet pipe fixedly communicated with the valve body. The inlet pipe is fixedly communicated with a liquefied petroleum gas cylinder. A gas blocking head is arranged in the inlet pipe. A through hole is formed in the middle of the gas blocking head. An overcurrent blocking ball is placed in the inlet pipe on the air inlet side of the gas blocking head. The diameter of the through hole is smaller than the diameter of the overcurrent blocking ball. A threaded pipe is fixedly communicated with the top of the inlet pipe located at the top of the overcurrent blocking ball. A reset assembly is arranged in the threaded pipe. The overcurrent blocking ball that fits against the side of the through hole due to excessive gas flow is reset through the reset assembly. A ring-shaped cylinder is fixed to one side of the gas blocking head. A partition plate is fixed to one side of the ring-shaped cylinder. A leakage prevention cavity is formed between the partition plate and the gas blocking head. A communicating pipe fixedly communicated with the partition plate is arranged in the leakage prevention cavity. A leakage prevention assembly is arranged at the bottom of the communicating pipe.

[0008] Furthermore, the reset assembly includes an installation pipe that is movably screwed into the threaded pipe. A bottom jack and a top jack are formed in the installation pipe. Among them, the aperture of the bottom jack is smaller than the aperture of the top jack. A reset rod is movably inserted into the bottom jack. After the overcurrent blocking ball fits against the side of the through hole, the reset rod is located on the left side of the overcurrent blocking ball or directly above the overcurrent blocking ball. A pressing rod adapted to the top jack is formed at the top of the reset rod. A first spring is fixed between the bottom wall of the top jack and the pressing rod. A sealing ring that fits against the top of the top jack is fixed on the rod body of the pressing rod.

[0009] Furthermore, an outer extension plate is formed at the top of the installation pipe. An annular plate is fixed to the outside of the pressing rod. An inner extension plate is formed at the bottom of the annular plate. A sealing ring is arranged between the outer extension plate and the inner extension plate. And a cavity is formed between the annular plate and the pressing rod.

[0010] Furthermore, the leakage prevention assembly includes a fixing plate. An elastic membrane plate is fixed to the side of the fixing plate facing away from the gas blocking head. A plurality of air outlet holes are formed in the plates of the fixing plate and the elastic membrane plate. A connecting block is arranged in the middle of the elastic membrane plate. A fixing pipe is fixed to the bottom of the fixing plate. A first insertion rod that is movably inserted into the fixing plate is fixed to the side of the connecting block. A first piston is fixed to the end of the first insertion rod. The first piston is movably inserted into one side pipe body of the fixing pipe. A second spring is fixed between the connecting block and the fixing plate. A top plate is arranged at the top of the other side pipe body of the fixing pipe. A leakage prevention blocking ball is arranged on the top of the top plate. A plurality of guide rods that are movably inserted into the top plate are fixed to the bottom of the leakage prevention blocking ball. A plurality of third springs are fixed between the leakage prevention blocking ball and the top plate. A second plug rod is fixed to the bottom end of the top plate, and a second piston that is movably inserted into the other pipe body of the fixed pipe is fixed to the bottom end of the second plug rod.

[0011] Furthermore, the air inlet of the communicating pipe is vertically downward, and the anti-leakage plug ball is located directly below the air inlet of the communicating pipe.

[0012] Furthermore, a medium is filled between the first piston and the second piston in the fixed pipe.

[0013] Furthermore, air flow holes, bottom vertical holes and top vertical holes are formed in the bottom of the annular cylinder. The aperture of the bottom vertical hole is larger than that of the top vertical hole. A piston pipe having an inner diameter equal to that of the top vertical hole is fixed to the top of the top vertical hole; A cross bar is fixed to the side surface of the top plate. A connecting rod is fixed to the bottom end of the cross bar. A third piston adapted to the piston pipe is fixed to the bottom end of the connecting rod; A gate slot is formed in the pipe body of the communicating pipe. A gate plate is movably inserted into the gate slot. The gate plate is fixed to the cross bar through a vertical rod.

[0014] Furthermore, a groove is provided in the air inlet pipe, and the bottom spherical surface of the flow-through plug ball is adapted to the groove.

[0015] Furthermore, a reducing pipe is fixed in the air inlet pipe. A communicating pipe that slopes downward is fixed and communicated with the side surface of the reducing pipe. The aperture of the communicating pipe is smaller than the diameter of the flow-through plug ball. The extension line of the central axis of the communicating pipe is located at the bottom of the flow-through plug ball.

[0016] Furthermore, a slope is formed on the outer side of the through hole of the air blocking head. A magnet is arranged in the air blocking head. A magnetic conductive layer is arranged on the outer surface of the flow-through plug ball. The magnet and the magnetic conductive layer attract each other.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: For the liquefied petroleum gas cylinder valve, a reset assembly is provided. Under high pressure, if liquefied petroleum gas leaks due to poor sealing between the pressure rod and the side wall of the top jack, the liquefied petroleum gas will enter the cavity. As the pressure in the cavity increases, the pressure rod will move upward. At this time, the extrusion force between the inner extension plate and the sealing ring will increase, which can effectively prevent the liquefied petroleum gas from leaking into the air, improve the sealing performance of the reset assembly, and enhance the safety of use of the cylinder valve.

[0018] Meanwhile, a leakage prevention component is provided. After the overcurrent blocking ball seals the slope surface, since there is no air flow thrust on the elastic diaphragm, the second spring drives the elastic diaphragm to reset to the right. At this time, the first piston moves to the right along the fixed pipe, and the first piston pushes the medium, so as to realize the upward movement of the second piston along the fixed pipe, and realize the sealing of the communication pipe by the leakage prevention blocking ball, thereby ensuring the tightness of the leakage prevention cavity and preventing liquefied petroleum gas from leaking to the outside through the gap between the overcurrent blocking ball and the slope surface.

[0019] In addition, a slope surface, a magnet and a magnetic conductive layer are provided, so that when there is an overcurrent, the overcurrent blocking ball can fit on the slope surface, improving the fitting effect between the spherical surface of the overcurrent blocking ball and the slope surface, thereby increasing the sealing performance between the overcurrent blocking ball and the air blocking head.

[0020] In addition, a groove, a reduced diameter pipe and a downwardly inclined vent pipe are provided. During overcurrent, the air flow of liquefied petroleum gas blown out through the vent pipe pushes the bottom of the overcurrent blocking ball, causing the overcurrent blocking ball to float up quickly, improving the response sensitivity of the overcurrent blocking ball during overcurrent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a half-sectional view of the air inlet pipe of the present invention; Figure 3 is a sectional view of the air inlet pipe of the present invention; Figure 4 is Figure 3 an enlarged view of part A in Figure 5 is an axonometric view of the air blocking head of the present invention; Figure 6 is a half-sectional view of the air blocking head of the present invention; Figure 7 is Figure 6 an enlarged view of part B in

[0022] In the figure: 1. Valve body; 2. Inlet pipe; 3. Outlet pipe; 4. Air-blocking head; 401. Annular cylinder; 402. Partition plate; 403. Connecting pipe; 404. Slope; 405. Magnet; 5. Anti-leakage component; 501. Fixed plate; 502. Elastic diaphragm; 503. Connecting block; 504. Fixed pipe; 505. First piston; 506. Second spring; 507. Second plug rod; 508. Second piston; 509. Top plate; 510. Anti-leakage plug ball; 511. Guide rod; 512. Third spring; 513. Air flow hole; 514. Bottom vertical hole; 515. Piston pipe; 516. Third piston; 517. Connecting rod; 518. Cross bar; 519. Gate slot; 520. Gate plate; 6. Overflow plug ball; 601. Magnetizable layer; 7. Reset component; 701. Threaded pipe; 702. Installation pipe; 703. Reset rod; 704. Outer extension plate; 705. Sealing ring; 706. First spring; 707. Pressing rod; 708. Annular plate; 709. Sealing ring; 801. Reducing pipe; 802. Vent pipe. Specific implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] The cylinder valve of this solution is used for the overcurrent protection of liquefied petroleum gas cylinders.

[0025] Example 1: As Figures 1-7As shown in the figure, the present invention provides a technical solution: a liquefied petroleum gas cylinder valve, including a valve body 1, an intake pipe 2 and an outlet pipe 3. The intake pipe 2 and the outlet pipe 3 are fixedly connected to the valve body 1, and the intake pipe 2 and the outlet pipe 3 are symmetrically arranged on both sides of the valve body 1. Among them, the intake pipe 2 is connected to the liquefied petroleum gas cylinder, and the outlet pipe 3 is connected to a cooker or other gas-requiring devices. A gas-blocking head 4 made of rubber material is arranged in the intake pipe 2. To ensure the connection stability of the gas-blocking head 4 in the intake pipe 2, an interference fit is adopted between the gas-blocking head 4 and the intake pipe 2. When installing the gas-blocking head 4, it is necessary to open the top cover of the valve body 1 and insert the gas-blocking head 4 from the left side of the intake pipe 2. To further improve the connection stability of the gas-blocking head 4 in the intake pipe 2, an adhesive can also be coated on the outer side of the gas-blocking head 4. A through hole is opened in the middle of the gas-blocking head 4, and a slope 404 is opened on the outside of the through hole. An overcurrent blocking ball 6 made of glass, plastic or other hard materials is placed in the intake pipe 2 on the intake side of the gas-blocking head 4. It should be noted that the diameter of the through hole is smaller than the diameter of the overcurrent blocking ball 6, and the weight of the overcurrent blocking ball 6 is comprehensively determined by technicians according to factors such as the pressure of liquefied petroleum gas and the minimum overcurrent. When overcurrent occurs, the liquefied petroleum gas flowing in the outlet pipe 3 blows up the overcurrent blocking ball 6, thereby realizing the blocking of the through hole. When blocking, the spherical surface of the overcurrent blocking ball 6 fits with the slope 404.

[0026] To improve the fitting effect between the spherical surface of the overcurrent blocking ball 6 and the slope 404, thereby increasing the sealing performance between the overcurrent blocking ball 6 and the gas-blocking head 4, as Figure 3 and Figure 6 shown, a magnet 405 with the same cross-section as the slope 404 is arranged in the gas-blocking head 4, and a magnetic conductive layer 601 is electroplated or sprayed on the outer surface of the overcurrent blocking ball 6. It can be known that the magnet 405 attracts the magnetic conductive layer 601. In addition, the magnet 405 can be replaced by magnetic powder, that is, magnetic powder is sprayed on the slope 404, thereby forming a magnetic film on the surface of the slope 404. The fitting between the spherical surface of the overcurrent blocking ball 6 and the slope 404 is realized through the principle of attraction between the magnetic film and the magnetic conductive layer 601 on the outer surface of the overcurrent blocking ball 6. It should also be noted that in this solution, when there is no overcurrent, the suction force between the magnet 405 and the magnetic conductive layer 601 can overcome the self-gravity of the overcurrent blocking ball 6, so that the overcurrent blocking ball 6 fits on the outside of the slope 404.

[0027] As Figures 2-4 shown, a threaded pipe 701 is fixedly connected to the top of the intake pipe 2 at the top of the overcurrent blocking ball 6, and a reset assembly 7 is arranged in the threaded pipe 701. The overcurrent blocking ball 6 that fits against the side of the through hole due to excessive gas flow is reset through the reset assembly 7.

[0028] Specifically, the reset component 7 includes an installation pipe 702 that is movably screwed to the threaded pipe 701. A bottom jack and a top jack are formed in the installation pipe 702. Among them, the aperture ratio between the bottom jack and the top jack is 1:1.1 - 1.5. A reset rod 703 with a pointed top is movably inserted into the bottom jack. After the overcurrent blocking ball 6 fits against the side of the through hole, referring to Figure 3 As shown, the reset rod 703 is located on the left side of the overcurrent blocking ball 6 or directly above the overcurrent blocking ball 6, so that the overcurrent blocking ball 6 can be pushed to disengage from the slope 404. A pressure rod 707 adapted to the top jack is formed at the top of the reset rod 703. And a sealing ring 705 made of rubber material that fits against the top of the top jack is fixed on the bottom rod body of the pressure rod 707. A first spring 706 is fixed between the bottom wall of the top jack and the pressure rod 707, and the reset rod 703 is located within the helix of the first spring 706. In addition, an outer extension plate 704 is formed at the top of the installation pipe 702. An annular plate 708 is fixed to the outside of the pressure rod 707, and an inner extension plate is formed at the bottom of the annular plate 708. The bottom end surface of the outer extension plate 704 is flush with the top end surface of the inner extension plate. A sealing ring 709 is fixed to the bottom of the outer extension plate 704. When the cross-section of the sealing ring 709 is circular, correspondingly, a sealing groove with a circular cross-section is formed on the top end surface of the inner extension plate, and the sealing groove and the sealing ring 709 are in interference fit. Of course, when the cross-section of the sealing ring 709 is rectangular, the top of the inner extension plate is a flat surface. In this way, in the initial state, under the elastic force of the first spring 706, the inner extension plate and the sealing ring 709 are pressed against each other. At this time, a cavity is formed between the annular plate 708 and the pressure rod 707. Under high pressure, if the liquefied petroleum gas leaks due to poor sealing between the pressure rod 707 and the sealing ring 705 and the side wall of the top jack, the liquefied petroleum gas will enter the cavity. As the pressure in the cavity increases, the pressure rod 707 will move upward. At this time, the pressing force between the inner extension plate and the sealing ring 709 will increase, which can effectively prevent the liquefied petroleum gas from leaking into the air, increasing the sealing performance of the reset component 7 and improving the safety of using this cylinder valve.

[0029] As Figure 3 shown, an annular cylinder 401 is fixed to one side of the air blocking head 4, and a partition plate 402 is fixed to one side of the annular cylinder 401. In this way, a leakage prevention cavity is formed between the partition plate 402 and the air blocking head 4. A communicating pipe 403 that is fixedly connected to the partition plate 402 and is bent is arranged in the leakage prevention cavity. A leakage prevention component 5 that prevents the liquefied petroleum gas from leaking through the gap between the overcurrent blocking ball 6 and the slope 404 is arranged at the bottom of the communicating pipe 403.

[0030] Specifically, as Figure 6 and Figure 7As shown, the leakage prevention component 5 includes a fixing plate 501 fixed to the inner wall of the annular cylinder 401. A flexible diaphragm 502 made of rubber material is fixed to the side of the fixing plate 501 facing away from the air blocking head 4. A connecting block 503 is provided in the middle of the flexible diaphragm 502. When the flexible diaphragm 502 is subjected to pressure from the right side, it extends to the state as shown in Figure 6 shown. A number of air outlet holes with the same quantity are formed on the plates of both the fixing plate 501 and the flexible diaphragm 502. The diameter of the air outlet holes on the fixing plate 501 is larger than that of the air outlet holes on the plate of the flexible diaphragm 502. A fixed pipe 504 is fixed to the bottom of the fixing plate 501. A first plug rod that is movably inserted into the fixing plate 501 is fixed to the side of the connecting block 503. One side rod body of the first plug rod is movably inserted into the fixed pipe 504. A second spring 506 is fixed between the connecting block 503 and the fixing plate 501. The first plug rod is located within the coil of the second spring 506. A first piston 505 is fixed to the end of the first plug rod. The first piston 505 is movably inserted into one side pipe body of the fixed pipe 504. As shown in Figure 7 shown, a top plate 509 is provided at the top of the other side pipe body of the fixed pipe 504. A leakage prevention plug ball 510 is provided on the top of the top plate 509. A number of guide rods 511 that are movably inserted into the top plate 509 are fixed to the bottom of the leakage prevention plug ball 510. The vertical movement of the leakage prevention plug ball 510 is guided by the guide rods 511. In addition, a number of third springs 512 are fixed between the leakage prevention plug ball 510 and the top plate 509. The guide rods 511 are located within the coils of the third springs 512.

[0031] A second plug rod 507 that is movably inserted into the fixed pipe 504 is fixed to the bottom end of the top plate 509. A second piston 508 that is movably inserted into the other side pipe body of the fixed pipe 504 is fixed to the bottom end of the second plug rod 507. In this solution, the air inlet of the communicating pipe 403 is vertically downward, and the leakage prevention plug ball 510 is located directly below the air inlet of the communicating pipe 403. In this way, the blocking and unblocking of the communicating pipe 403 are realized through the vertical movement of the leakage prevention plug ball 510.

[0032] To enable the first piston 505 to drive the second piston 508 to move synchronously when moving, a medium is filled between the first piston 505 and the second piston 508 in the fixed pipe 504. Among them, the medium is preferably pure water added with antifreeze substances.

[0033] It can be known that after the flow-through plug ball 6 blocks the slope 404, since there is no air flow thrust on the flexible diaphragm 502, the second spring 506 drives the flexible diaphragm 502 to reset to the right (refer to Figure 6), at this time, the first piston 505 moves to the right along the fixed pipe 504. The first piston 505 pushes the medium, so as to realize the upward movement of the second piston 508 along the fixed pipe 504, and realize the blocking of the communication pipe 403 by the anti-leakage plug ball 510, thereby ensuring the tightness of the anti-leakage cavity and preventing liquefied petroleum gas from leaking to the outside through the gap between the overcurrent blocking ball 6 and the slope 404.

[0034] Embodiment 2: On the basis of Embodiment 1, air flow holes 513, bottom vertical holes 514 and top vertical holes are opened at the bottom of the annular cylinder 401. The air flow holes 513 are in communication with both the bottom vertical holes 514 and the top vertical holes, and the aperture of the bottom vertical holes 514 is larger than that of the top vertical holes. A piston pipe 515 with an inner diameter equal to that of the top vertical hole is fixed at the top of the top vertical hole. A cross bar 518 is fixed on the side surface of the top plate 509. The bottom end of the cross bar 518 is fixed with a connecting rod 517. The bottom end of the connecting rod 517 is fixed with a third piston 516 adapted to the piston pipe 515. When the anti-leakage plug ball 510 does not block the communication pipe 403 (refer to Figure 6 ), the third piston 516 is located in the bottom vertical hole 514. When the anti-leakage plug ball 510 blocks the communication pipe 403, the third piston 516 is driven to move upward through the cross bar 518, and the third piston 516 is located in the piston pipe 515, so as to form a sealed space in the anti-leakage cavity. A gate groove 519 is opened on the pipe body of the communication pipe 403, and a gate plate 520 is movably inserted into the gate groove 519, and the gate plate 520 is fixed to the cross bar 518 through a vertical rod. When the anti-leakage plug ball 510 blocks the communication pipe 403, the gate plate 520 is completely inserted into the gate groove 519 to block the communication pipe 403 again. When the anti-leakage plug ball 510 does not block the communication pipe 403 (refer to Figure 6 ), the communication pipe 403 is in a conducting state.

[0035] Such a setting is considered that when the gas-using device is closed and opened, liquefied petroleum gas can be transported to the gas-using device. Specifically, when the gas-using device is closed, since there is no air flow thrust on the elastic diaphragm 502, the second spring 506 drives the elastic diaphragm 502 to reset to the right (refer to Figure 6 ), the anti-leakage plug ball 510 and the gate plate 520 block the communication pipe 403 and the communication pipe 403 respectively. At this time, the air pressures in the anti-leakage cavity and the air inlet pipe 2 are equal. When the gas-using device is opened, a high pressure difference is generated between the air outlet pipe 3 and the air inlet pipe 2. Under the action of air pressure, the third piston 516 moves downward, so as to drive the anti-leakage plug ball 510 to contact and block the communication pipe 403 through the top plate 509. At this time, high-pressure air flows into the anti-leakage cavity through the air blocking head 4 to realize ventilation.

[0036] Embodiment 3: On the basis of Embodiment 1 or Embodiment 2, a groove is provided in the intake pipe 2, and the bottom spherical surface of the flow-through blocking ball 6 is adapted to the groove. It can be known that the purpose of such a setting is to improve the placement stability of the flow-through blocking ball 6 and improve the response sensitivity of the flow-through blocking ball 6 during overcurrent.

[0037] Embodiment 4: On the basis of Embodiment 3, as Figure 3 shown, a reduced-diameter pipe 801 is fixed in the intake pipe 2, and a downwardly inclined vent pipe 802 is fixedly connected to the side of the reduced-diameter pipe 801. Moreover, the aperture of the vent pipe 802 is smaller than the diameter of the flow-through blocking ball 6. In addition, the extension line of the central axis of the vent pipe 802 is located at the bottom of the flow-through blocking ball 6.

[0038] During overcurrent, the airflow of liquefied petroleum gas blown out through the vent pipe 802 pushes the bottom of the flow-through blocking ball 6, causing the flow-through blocking ball 6 to float up quickly, further improving the response sensitivity of the flow-through blocking ball 6 during overcurrent.

[0039] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended embodiments and their equivalents.

Claims

1. A liquefied petroleum gas cylinder valve, comprising a valve body (1), an inlet pipe (2) and an outlet pipe (3) fixedly communicated with the valve body (1), the inlet pipe (2) being fixedly communicated with a liquefied petroleum gas cylinder, characterized in that: A gas-blocking head (4) is arranged in the intake pipe (2). A through hole is formed in the middle of the gas-blocking head (4). An overcurrent blocking ball (6) is placed in the intake pipe (2) on the intake side of the gas-blocking head (4). The diameter of the through hole is smaller than the diameter of the overcurrent blocking ball (6). A threaded pipe (701) is fixedly communicated with the top of the intake pipe (2) located at the top of the overcurrent blocking ball (6). A reset assembly (7) is arranged in the threaded pipe (701). The overcurrent blocking ball (6) that fits against the side of the through hole due to excessive gas flow is reset by the reset assembly (7). An annular cylinder (401) is fixed to one side of the gas-blocking head (4). A partition plate (402) is fixed to one side of the annular cylinder (401). A leakage prevention cavity is formed between the partition plate (402) and the gas-blocking head (4). A communicating pipe (403) fixedly communicated with the partition plate (402) is arranged in the leakage prevention cavity. A leakage prevention assembly (5) is arranged at the bottom of the communicating pipe (403).

2. The liquefied petroleum gas cylinder valve according to claim 1, characterized in that: The reset assembly (7) includes a mounting pipe (702) that is movably screwed into the threaded pipe (701). A bottom jack and a top jack are formed in the mounting pipe (702). Among them, the aperture of the bottom jack is smaller than the aperture of the top jack. A reset rod (703) is movably inserted into the bottom jack. After the overcurrent blocking ball (6) fits against the side of the through hole, the reset rod (703) is located on the left side of the overcurrent blocking ball (6) or directly above the overcurrent blocking ball (6). A pressing rod (707) adapted to the top jack is formed at the top of the reset rod (703). A first spring (706) is fixed between the bottom wall of the top jack and the pressing rod (707). A sealing ring (705) that fits against the top of the top jack is fixed on the rod body of the pressing rod (707).

3. The liquefied petroleum gas cylinder valve according to claim 2, characterized in that: An outer extension plate (704) is formed at the top of the mounting pipe (702). An annular plate (708) is fixed to the outside of the pressing rod (707). An inner extension plate is formed at the bottom of the annular plate (708). A sealing ring (709) is arranged between the outer extension plate (704) and the inner extension plate. And a cavity is formed between the annular plate (708) and the pressing rod (707).

4. A liquefied petroleum gas cylinder valve according to claim 1, characterized in that: The leakage prevention assembly (5) includes a fixing plate (501). An elastic membrane plate (502) is fixed to the side of the fixing plate (501) facing away from the gas-blocking head (4). A plurality of air outlet holes are formed in the plates of the fixing plate (501) and the elastic membrane plate (502). A connecting block (503) is arranged in the middle of the elastic membrane plate (502). A fixing pipe (504) is fixed to the bottom of the fixing plate (501). A first plug rod that is movably inserted into the fixing plate (501) is fixed to the side of the connecting block (503). A first piston (505) is fixed to the end of the first plug rod. The first piston (505) is movably inserted into one side pipe body of the fixing pipe (504). A second spring (506) is fixed between the connecting block (503) and the fixing plate (501). At the top of the tube body on the other side of the fixed tube (504), there is a top plate (509). At the top of the top plate (509), there is an anti-leakage plug ball (510). At the bottom of the anti-leakage plug ball (510), several guide rods (511) that are movably inserted into the top plate (509) are fixed. Between the anti-leakage plug ball (510) and the top plate (509), several third springs (512) are fixed; At the bottom end of the top plate (509), a second insertion rod (507) is fixed. At the bottom end of the second insertion rod (507), a second piston (508) that is movably inserted into the tube body on the other side of the fixed tube (504) is fixed.

5. A liquefied petroleum gas cylinder valve according to claim 4, characterized in that: The air inlet of the connecting pipe (403) is vertically downward, and the anti-leakage plug ball (510) is located directly below the air inlet of the connecting pipe (403).

6. The liquefied petroleum gas cylinder valve according to claim 4, characterized in that: A medium is filled between the first piston (505) and the second piston (508) in the fixed tube (504).

7. A liquefied petroleum gas cylinder valve according to claim 4, characterized in that: At the bottom of the annular cylinder (401), there are an air flow hole (513), a bottom vertical hole (514), and a top vertical hole. The aperture of the bottom vertical hole (514) is larger than that of the top vertical hole. At the top of the top vertical hole, a piston tube (515) with an inner diameter equal to that of the top vertical hole is fixed; On the side of the top plate (509), a cross bar (518) is fixed. At the bottom end of the cross bar (518), a connecting rod (517) is fixed. At the bottom end of the connecting rod (517), a third piston (516) that is adapted to the piston tube (515) is fixed; On the tube body of the connecting pipe (403), a gate slot (519) is provided. A gate plate (520) is movably inserted into the gate slot (519). The gate plate (520) and the cross bar (518) are fixed by a vertical rod.

8. A liquefied petroleum gas cylinder valve according to claim 1, characterized in that: In the intake pipe (2), there is a groove, and the bottom spherical surface of the flow-through plug ball (6) is adapted to the groove.

9. A liquefied petroleum gas cylinder valve according to claim 1 or 8, characterized in that: In the intake pipe (2), a variable-diameter pipe (801) is fixed. On the side of the variable-diameter pipe (801), a downwardly inclined ventilation pipe (802) is fixedly connected. And the aperture of the ventilation pipe (802) is smaller than the diameter of the flow-through plug ball (6). The extension line of the central axis of the ventilation pipe (802) is located at the bottom of the flow-through plug ball (6).

10. A liquefied petroleum gas cylinder valve according to claim 1, characterized in that: On the outer side of the through hole of the air-blocking head (4), a slope surface (404) is provided. In the air-blocking head (4), there is a magnet (405). On the outer surface of the flow-through plug ball (6), a magnetic conductive layer (601) is provided. The magnet (405) and the magnetic conductive layer (601) attract each other.

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