A liquefied petroleum gas cylinder valve

Abstract

The present invention discloses a liquefied petroleum gas cylinder valve, which relates to the technical field of petroleum gas shut-off valves. The valve body comprises an air inlet pipe and an air outlet pipe fixedly connected to the valve body. The air inlet pipe is fixedly connected to the liquefied petroleum gas cylinder. A gas plug is provided in the air inlet pipe, a through hole is provided in the middle of the gas plug, and an overflow blocking ball is placed in the air inlet pipe on the air inlet side of the gas plug. The diameter of the through hole is smaller than the diameter of the overflow blocking ball. The present invention is provided with a reset assembly. Under high pressure, if the pressure rod and the sealing ring and the side wall of the top socket cause leakage due to poor sealing, 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 squeezing 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, thereby increasing the sealing performance of the reset assembly and improving the safety of the cylinder valve.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum gas cut-off valves, in particular 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 equipment used. Its safety is directly related to the safety of users' lives and property.

[0003] A Chinese invention patent, application publication number CN118793822A, discloses a shut-off valve for liquefied petroleum gas cylinders. The valve has an air inlet on the right side and an air outlet on the left side. The valve contains a gas supply channel, which includes, from right to left, an air inlet channel, a flow chamber, a valve chamber, and an air outlet channel. The flow chamber contains a steel ball, which is reset by a reset button. The valve chamber contains a valve core that blocks the valve chamber and is driven by a coil. The valve has an automatic shut-off function, an integrated fault self-feedback solenoid valve, and uses a five-core wire to improve feedback stability.

[0004] For example, the Chinese invention patent, application publication number CN117469438A discloses a manually press-reset overcurrent cut-off liquefied petroleum gas cylinder valve, which belongs to the technical field of gas cylinder valves. When gas leakage occurs, the floating steel ball of the overcurrent cut-off valve closes the overcurrent cut-off outlet of the overcurrent cut-off valve under the impact of the medium on the sealing flat gasket of the overcurrent cut-off valve seat. The overcurrent cut-off valve cover body is pressed, and the overcurrent cut-off valve spring rod body slides in the manual press-reset component of the overcurrent cut-off valve to squeeze 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 outlet position, supplements the product safety protection function, and the present invention can be quickly reset by pressing the overcurrent cut-off valve cover body. The operation is simple and practical.

[0005] The above solutions all solve the problem of overcurrent protection for liquefied petroleum gas cylinders. However, in actual applications, the existing technology and the overcurrent protection valves currently circulating on the market still have certain defects:

[0006] For example, since the reset assembly used to reset the sealing ball is set on the side of the high-pressure air intake pipe, pressing the reset assembly multiple times may reduce the sealing performance of the reset assembly, thereby causing high-pressure petroleum gas to leak at the reset assembly;

[0007] In addition, in order to improve the sealing effect, the gas plugging head used for sealing is generally made of rubber material. After long-term use of liquefied petroleum gas cylinders, the rubber material may crack due to aging, and impurities in the liquefied petroleum gas will adhere to the outer surface of the gas plugging head and the anti-leakage plugging ball, thereby reducing the sealing between the gas plugging head and the anti-leakage plugging ball, causing liquefied petroleum gas leakage. Summary of the Invention

[0008] The object of the present invention is to provide a liquefied petroleum gas cylinder valve to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solution: a liquefied petroleum gas cylinder valve, comprising a valve body, an air inlet pipe and an air outlet pipe fixedly connected to the valve body, the air inlet pipe being fixedly connected to the liquefied petroleum gas cylinder, a gas plug being provided in the air inlet pipe, a through hole being formed in the middle of the gas plug, an overflow blocking ball being placed in the air inlet pipe on the air inlet side of the gas plug, the diameter of the through hole being smaller than the diameter of the overflow blocking ball;

[0010] The top of the air inlet pipe located on top of the overflow blocking ball is fixedly connected with a threaded tube, and a reset component is provided in the threaded tube. The overflow blocking ball that is in contact with the side of the through hole due to excessive gas flow is reset by the reset component;

[0011] An annular cylinder is fixed on one side of the gas blocking head, and a partition is fixed on one side of the annular cylinder. A leakage-proof cavity is formed between the partition and the gas blocking head. A connecting pipe fixedly connected to the partition is provided in the leakage-proof cavity, and an anti-leakage component is provided at the bottom of the connecting pipe.

[0012] Furthermore, the reset assembly includes a mounting tube movably screwed to the threaded tube, a bottom socket and a top socket formed in the mounting tube, wherein the aperture of the bottom socket is smaller than the aperture of the top socket, a reset rod is movably inserted in the bottom socket, and when the overflow blocking ball is in contact with the side surface of the through hole, the reset rod is located to the left of the overflow blocking ball or directly above the overflow blocking ball;

[0013] A pressure rod adapted to the top socket is formed on the top of the reset rod, a first spring is fixed between the bottom wall of the top socket and the pressure rod, and a sealing ring that fits the top of the top socket is fixed on the rod body of the pressure rod.

[0014] Furthermore, an outer extension plate is formed on the top of the mounting tube, an annular plate is fixed on the outside of the pressure rod, an inner extension plate is formed at the bottom of the annular plate, a sealing ring is provided between the outer extension plate and the inner extension plate, and a cavity is formed between the annular plate and the pressure rod.

[0015] Furthermore, the anti-leakage assembly includes a fixed plate, an elastic membrane plate is fixed to the side of the fixed plate away from the gas blocking head, a plurality of air outlet holes are opened on the plate body of the fixed plate and the elastic membrane plate, a connecting block is provided in the middle of the elastic membrane plate, and a fixing tube is fixed to the bottom of the fixed plate;

[0016] A first plug rod movably connected to the fixed plate is fixed to the side of the connecting block, a first piston is fixed to the end of the first plug rod, the first piston is movably connected to the tube body on one side of the fixed tube, and a second spring is fixed between the connecting block and the fixed plate;

[0017] A top plate is provided on the top of the tube body on the other side of the fixed tube, an anti-leakage blocking ball is provided on the top of the top plate, a plurality of guide rods movably connected to the top plate are fixed to the bottom of the anti-leakage blocking ball, and a plurality of third springs are fixed between the anti-leakage blocking ball and the top plate;

[0018] A second plug rod is fixed at the bottom end of the top plate, and a second piston movably plugged with the tube body on the other side of the fixed tube is fixed at the bottom end of the second plug rod.

[0019] Furthermore, the air inlet of the connecting pipe is vertically downward, and the anti-leakage blocking ball is located directly below the air inlet of the connecting pipe.

[0020] Furthermore, a medium is placed between the first piston and the second piston in the fixed tube.

[0021] Furthermore, the bottom of the annular cylinder is provided with an air flow hole, a bottom vertical hole and a top vertical hole, the aperture of the bottom vertical hole is larger than the aperture of the top vertical hole, and a piston tube having an inner diameter equal to that of the top vertical hole is fixed to the top of the top vertical hole;

[0022] A crossbar is fixed to the side of the top plate, a connecting rod is fixed to the bottom end of the crossbar, and a third piston adapted to the piston tube is fixed to the bottom end of the connecting rod;

[0023] A gate groove is provided on the pipe body of the communicating pipe, a gate plate is movably inserted in the gate groove, and the gate plate and the cross bar are fixed by a vertical bar.

[0024] Furthermore, a groove is provided in the air inlet pipe, and the bottom spherical surface of the flow blocking ball is adapted to the groove.

[0025] Furthermore, a reducer is fixed in the air inlet pipe, and a downward-inclined ventilation pipe is fixedly connected to the side of the reducer, and the aperture of the ventilation pipe is smaller than the diameter of the flow-blocking ball, and the extension line of the central axis of the ventilation pipe is located at the bottom of the flow-blocking ball.

[0026] Furthermore, a slope is provided on the outer side of the through hole of the gas blocking head, a magnet is provided in the gas blocking head, and a magnetic conductive layer is provided on the outer surface of the flow blocking ball, and the magnet and the magnetic conductive layer are attracted to each other.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The liquefied petroleum gas cylinder valve is provided with a reset assembly. Under high pressure, if leakage occurs due to poor sealing between the pressure rod and the sealing ring and the side wall of the top socket, liquefied petroleum gas will enter the cavity. As the pressure in the cavity increases, the pressure rod will move upward. At this time, the squeezing 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 improve the safety of the cylinder valve.

[0029] At the same time, an anti-leakage component is provided. When the overflow blocking ball blocks the slope, the elastic diaphragm has no airflow thrust, and 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 tube, and the first piston pushes the medium, thereby realizing the second piston moving upward along the fixed tube, realizing the blocking of the connecting tube by the anti-leakage blocking ball, thereby ensuring the airtightness of the anti-leakage cavity and preventing liquefied petroleum gas from leaking to the outside through the gap between the overflow blocking ball and the slope.

[0030] In addition, a slope surface, a magnet and a magnetic conductive layer are provided so that the flow blocking ball can fit on the slope surface when the flow is flowing, thereby improving the fitting effect between the spherical surface of the flow blocking ball and the slope surface, thereby increasing the sealing between the flow blocking ball and the gas blocking head.

[0031] In addition, grooves, reducing pipes and downward-inclined vent pipes are also provided. When the flow is excessive, the airflow of liquefied petroleum gas blown out through the vent pipe pushes the bottom of the excessive flow blocking ball, causing the excessive flow blocking ball to float up quickly, thereby improving the response sensitivity of the excessive flow blocking ball during excessive flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 A half-section view of the air intake pipe of the present invention;

[0034] Figure 3 is a cross-sectional view of the air intake pipe of the present invention;

[0035] Figure 4 for Figure 3 Enlarged view of part A;

[0036] Figure 5 This is an axial view of the gas plug of the present invention;

[0037] Figure 6 A half-section view of the gas plug of the present invention;

[0038] Figure 7 for Figure 6 Magnified view of part B.

[0039] In the figure: 1. Valve body; 2. Air inlet pipe; 3. Air outlet pipe; 4. Air plug; 401. Annular cylinder; 402. Partition; 403. Connecting pipe; 404. Slope; 405. Magnet; 5. Anti-leakage assembly; 501. Fixed plate; 502. Elastic membrane plate; 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 ball; 511. Guide rod; 512. Third spring ; 513, air flow hole; 514, bottom vertical hole; 515, piston tube; 516, third piston; 517, connecting rod; 518, cross bar; 519, gate groove; 520, gate plate; 6, over-flow blocking ball; 601, magnetic conductive layer; 7, reset assembly; 701, threaded tube; 702, mounting tube; 703, reset rod; 704, outer extension plate; 705, sealing ring; 706, first spring; 707, pressure rod; 708, annular plate; 709, sealing ring; 801, reducer; 802, vent pipe. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0041] The cylinder valve of this solution is used for overcurrent protection of liquefied petroleum gas cylinders.

[0042] Example 1: Figure 1-Figure 7As shown, the present invention provides a technical solution: a liquefied petroleum gas cylinder valve, comprising a valve body 1, an air inlet pipe 2 and an air outlet pipe 3, the air inlet pipe 2 and the air outlet pipe 3 are fixedly connected to the valve body 1, and the air inlet pipe 2 and the air outlet pipe 3 are symmetrically arranged on both sides of the valve body 1, wherein the air inlet pipe 2 is connected to the liquefied petroleum gas cylinder, and the air outlet pipe 3 is connected to the stove or other gas-requiring device, and a gas plug 4 made of rubber material is provided in the air inlet pipe 2. To ensure the connection stability of the gas plug 4 in the air inlet pipe 2, the gas plug 4 and the air inlet pipe 2 are interference fit. When installing the gas plug 4, it is necessary to open the top cover of the valve body 1 and insert the gas plug 4 from the left side of the air inlet pipe 2. To further improve To ensure the connection stability of the high-pressure gas plug 4 in the air inlet pipe 2, the outer side of the gas plug 4 can also be coated with adhesive. A through hole is provided in the middle of the gas plug 4, and a slope 404 is provided on the outer side of the through hole. A flow-blocking ball 6 made of glass, plastic or other hard materials is placed in the air inlet pipe 2 on the air inlet side of the gas plug 4. It should be noted that the diameter of the through hole is smaller than the diameter of the flow-blocking ball 6. The weight of the flow-blocking ball 6 is comprehensively determined by technicians based on factors such as the pressure of the liquefied petroleum gas and the minimum flow rate. When an overflow occurs, the liquefied petroleum gas flowing in the outlet pipe 3 blows up the flow-blocking ball 6, thereby achieving the blocking of the through hole. During blocking, the spherical surface of the flow-blocking ball 6 fits with the slope 404.

[0043] In order to improve the fit between the spherical surface of the overflow blocking ball 6 and the slope 404, thereby increasing the sealing between the overflow blocking ball 6 and the gas blocking head 4, as shown in FIG. Figure 3 and Figure 6 As shown, a magnet 405 with the same cross-section as the slope 404 is provided in the gas blocking head 4, and a magnetic conductive layer 601 is electroplated or sprayed on the outer surface of the flow-blocking ball 6. It can be seen that the magnet 405 and the magnetic conductive layer 601 attract each other. In addition, the magnet 405 can also be replaced with magnetic powder, that is, magnetic powder is sprayed on the slope 404, so as to form a magnetic film on the surface of the slope 404. The spherical surface of the flow-blocking ball 6 and the slope 404 are fitted together by the principle of attraction between the magnetic film and the magnetic conductive layer 601 on the outer surface of the flow-blocking ball 6. It should also be noted that in this solution, when there is no flow, the suction force between the magnet 405 and the magnetic conductive layer 601 can overcome the self-gravity of the flow-blocking ball 6, thereby making the flow-blocking ball 6 fit to the outside of the slope 404.

[0044] like Figure 2-Figure 4 As shown, the top of the air inlet pipe 2 located on top of the overflow blocking ball 6 is fixedly connected to a threaded tube 701, and a reset component 7 is provided in the threaded tube 701. The overflow blocking ball 6 that fits against the side of the through hole due to excessive gas flow is reset by the reset component 7.

[0045] Specifically, the reset assembly 7 includes a mounting tube 702 that is movably screwed to the threaded tube 701. A bottom jack and a top jack are formed in the mounting tube 702. 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. When the overflow blocking ball 6 is in contact with the side of the through hole, the reset rod 703 is rotated. Figure 3 As shown, the reset rod 703 is located on the left side of the overflow blocking ball 6 or just above the overflow blocking ball 6, so that the overflow blocking ball 6 can be pushed to disengage it from the slope 404, and a pressure rod 707 adapted to the top socket is formed on the top of the reset rod 703, and a sealing ring 705 made of rubber material that fits the top of the top socket is fixed on the bottom rod body of the pressure rod 707, and a first spring 706 is fixed between the bottom wall of the top socket and the pressure rod 707, and the reset rod 703 is located in the spiral coil of the first spring 706. In addition, an outer extension plate 704 is formed on the top of the mounting tube 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 surface of the inner extension plate, and a sealing ring 709 is fixed to the bottom of the outer extension plate 704. When the cross section is circular, a sealing groove with a circular cross section is formed on the top surface of the inner extension plate, and the sealing groove and the sealing ring 709 are interference fit. Of course, when the cross section of the sealing ring 709 is rectangular, the top of the inner extension plate is flat. 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 squeezed. At this time, a cavity is formed between the annular plate 708 and the pressure rod 707. Under high pressure, if the pressure rod 707 and the sealing ring 705 and the side wall of the top socket leak due to poor sealing, 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 squeezing 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, increase the sealing of the reset component 7, and improve the safety of the cylinder valve.

[0046] like Figure 3 As shown, an annular cylinder 401 is fixed on one side of the gas blocking head 4, and a partition 402 is fixed on one side of the annular cylinder 401. In this way, a leakage-proof cavity is formed between the partition 402 and the gas blocking head 4. A connecting pipe 403 fixedly connected to the partition 402 and in a curved shape is provided in the leakage-proof cavity. The bottom of the connecting pipe 403 is provided with a leakage-proof component 5 to prevent liquefied petroleum gas from leaking out through the gap between the flow-blocking ball 6 and the slope 404.

[0047] Specifically, such as Figure 6 and Figure 7As shown, the anti-leakage component 5 includes a fixing plate 501 fixed to the inner wall of the annular cylinder 401, and an elastic membrane 502 made of rubber material is fixed on the side of the fixing plate 501 away from the gas blocking head 4, and a connecting block 503 is provided in the middle of the elastic membrane 502. When the elastic membrane 502 is subjected to right-side pressure, it extends to Figure 6 In the state shown, the fixed plate 501 and the elastic membrane plate 502 are both provided with a plurality of air outlet holes of the same number, and the diameter of the air outlet holes on the fixed plate 501 is larger than the diameter of the air outlet holes on the elastic membrane plate 502. A fixed tube 504 is fixed to the bottom of the fixed plate 501, and a first plug rod movably connected to the fixed plate 501 is fixed on the side of the connecting block 503, and the rod body on one side of the first plug rod is movably connected to the fixed tube 504, a second spring 506 is fixed between the connecting block 503 and the fixed plate 501, the first plug rod is located in the spiral coil of the second spring 506, and a first piston 505 is fixed at the end of the first plug rod, and the first piston 505 is movably connected to the tube body on one side of the fixed tube 504, as shown in FIG. Figure 7 As shown, a top plate 509 is provided on the top of the tube body on the other side of the fixed tube 504, and an anti-leakage blocking ball 510 is provided on the top of the top plate 509. A plurality of guide rods 511 movably connected to the top plate 509 are fixed to the bottom of the anti-leakage blocking ball 510, and the vertical movement of the anti-leakage blocking ball 510 is guided by the guide rods 511. In addition, a plurality of third springs 512 are fixed between the anti-leakage blocking ball 510 and the top plate 509, and the guide rods 511 are located in the spiral coil of the third spring 512.

[0048] A second plug rod 507 movably connected to the fixed tube 504 is fixed to the bottom end of the top plate 509, and a second piston 508 movably connected to the tube body on the other side of the fixed tube 504 is fixed to the bottom end of the second plug rod 507. In this solution, the air inlet of the connecting tube 403 is vertically downward, and the anti-leakage blocking ball 510 is located directly below the air inlet of the connecting tube 403. In this way, the connecting tube 403 can be blocked and unblocked by the vertical movement of the anti-leakage blocking ball 510.

[0049] In order to achieve synchronous movement of the second piston 508 when the first piston 505 moves, a medium is installed between the first piston 505 and the second piston 508 in the fixed tube 504, wherein the medium is preferably pure water added with antifreeze material.

[0050] It can be known that after the flow blocking ball 6 blocks the slope 404, since the elastic diaphragm 502 has no airflow thrust, the second spring 506 drives the elastic 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 tube 504, and the first piston 505 pushes the medium, so that the second piston 508 moves upward along the fixed tube 504, and the anti-leakage blocking ball 510 blocks the connecting tube 403, thereby ensuring the airtightness of the anti-leakage cavity and preventing the liquefied petroleum gas from leaking to the outside through the gap between the overflow blocking ball 6 and the slope 404.

[0051] Example 2: On the basis of Example 1, an air flow hole 513, a bottom vertical hole 514 and a top vertical hole are opened at the bottom of the annular cylinder 401. The air flow hole 513 is connected to the bottom vertical hole 514 and the top vertical hole. The aperture of the bottom vertical hole 514 is larger than the aperture of the top vertical hole. A piston tube 515 with the same inner diameter as the top vertical hole is fixed to the top of the top vertical hole. A cross bar 518 is fixed to the side of the top plate 509. A connecting rod 517 is fixed to the bottom end of the cross bar 518. A third piston 516 adapted to the piston tube 515 is fixed to the bottom end of the connecting rod 517. When the anti-leakage blocking ball 510 does not block the connecting pipe 403 (refer to Figure 6 ), the third piston 516 is located in the bottom vertical hole 514. When the anti-leakage blocking ball 510 blocks the connecting pipe 403, the third piston 516 is driven to move upward by the cross bar 518. The third piston 516 is located in the piston tube 515, so that the anti-leakage cavity forms a closed space. A gate groove 519 is provided on the tube body of the connecting pipe 403. A gate plate 520 is movably inserted in the gate groove 519, and the gate plate 520 is fixed to the cross bar 518 by a vertical rod. When the anti-leakage blocking ball 510 blocks the connecting pipe 403, the gate plate 520 is completely inserted into the gate groove 519 to block the connecting pipe 403 again. When the anti-leakage blocking ball 510 does not block the connecting pipe 403 (refer to Figure 6 ), the connecting pipe 403 is in a conducting state.

[0052] This arrangement is to allow liquefied petroleum gas to be delivered to the gas device when the gas device is closed and opened. Specifically, when the gas device is closed, since the elastic diaphragm 502 has no airflow thrust, the second spring 506 drives the elastic diaphragm 502 to reset to the right (refer to Figure 6 ), the anti-leakage blocking ball 510 and the gate plate 520 respectively block the connecting pipe 403 and the connecting pipe 403. At this time, the air pressure in the anti-leakage chamber and the air inlet pipe 2 is equal. When the air-using device is turned on, 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, thereby driving the anti-leakage blocking ball 510 and the connecting pipe 403 to be unblocked through the top plate 509. At this time, the high-pressure airflow enters the anti-leakage chamber through the air blocking head 4 to achieve ventilation.

[0053] Example 3: Based on Example 1 or Example 2, a groove is provided in the intake pipe 2, and the bottom spherical surface of the overflow 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 overflow blocking ball 6 and improve the response sensitivity of the overflow blocking ball 6 during overflow.

[0054] Example 4: Based on Example 3, Figure 3 As shown, a reducing pipe 801 is fixed in the air inlet pipe 2 and a downward-inclined vent pipe 802 is fixedly connected to the side of the reducing pipe 801, and the aperture of the vent pipe 802 is smaller than the diameter of the flow-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-blocking ball 6.

[0055] During overflow, the LPG flow blown out through the vent pipe 802 pushes the bottom of the overflow blocking ball 6, causing the overflow blocking ball 6 to float up quickly, further improving the response sensitivity of the overflow blocking ball 6 during overflow.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is limited by the accompanying embodiments and their equivalents.

Claims

1. A liquefied petroleum gas cylinder valve, comprising a valve body (1), an air inlet pipe (2) and an air outlet pipe (3) fixedly connected to the valve body (1), wherein the air inlet pipe (2) is fixedly connected to the liquefied petroleum gas cylinder, and characterized in that: An air blocking head (4) is provided in the air inlet pipe (2), a through hole is provided in the middle of the air blocking head (4), an overflow blocking ball (6) is placed in the air inlet pipe (2) on the air inlet side of the air blocking head (4), and the diameter of the through hole is smaller than the diameter of the overflow blocking ball (6); The top of the air inlet pipe (2) located on the top of the overflow blocking ball (6) is fixedly connected to a threaded tube (701), and a reset component (7) is provided in the threaded tube (701). The overflow blocking ball (6) that is in contact with the side of the through hole due to excessive gas flow is reset by the reset component (7); An annular cylinder (401) is fixed to one side of the gas blocking head (4), a partition (402) is fixed to one side of the annular cylinder (401), a leakage prevention cavity is formed between the partition (402) and the gas blocking head (4), a connecting pipe (403) fixedly connected to the partition (402) is provided in the leakage prevention cavity, and a leakage prevention component (5) is provided at the bottom of the connecting pipe (403); The anti-leakage component (5) comprises a fixed plate (501), an elastic membrane plate (502) is fixed to the side of the fixed plate (501) facing away from the air blocking head (4), a plurality of air outlet holes are provided on the plate bodies of the fixed plate (501) and the elastic membrane plate (502), a connecting block (503) is provided in the middle of the elastic membrane plate (502), and a fixing tube (504) is fixed to the bottom of the fixed plate (501); A first plug rod movably connected to the fixed 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 connected to a tube body on one side of the fixed tube (504); and a second spring (506) is fixed between the connecting block (503) and the fixed plate (501); A top plate (509) is provided on the top of the tube body on the other side of the fixed tube (504), an anti-leakage blocking ball (510) is provided on the top of the top plate (509), a plurality of guide rods (511) movably connected to the top plate (509) are fixed to the bottom of the anti-leakage blocking ball (510), and a plurality of third springs (512) are fixed between the anti-leakage blocking ball (510) and the top plate (509); A second insertion rod (507) is fixed to the bottom end of the top plate (509), and a second piston (508) movably plugged into the tube body on the other side of the fixed tube (504) is fixed to the bottom end of the second insertion rod (507).

2. A liquefied petroleum gas cylinder valve according to claim 1, characterized in that: The reset assembly (7) includes a mounting tube (702) movably threaded with the threaded tube (701), a bottom jack and a top jack are formed in the mounting tube (702), wherein the aperture of the bottom jack is smaller than the aperture of the top jack, and a reset rod (703) is movably inserted in the bottom jack, and when the overflow blocking ball (6) is in contact with the side surface of the through hole, the reset rod (703) is located on the left side of the overflow blocking ball (6) or directly above the overflow blocking ball (6); A pressure rod (707) adapted to the top socket is formed on the top of the reset rod (703), a first spring (706) is fixed between the bottom wall of the top socket and the pressure rod (707), and a sealing ring (705) is fixed on the rod body of the pressure rod (707) to fit the top of the top socket.

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

4. The liquefied petroleum gas cylinder valve according to claim 1, characterized in that: The air inlet of the connecting pipe (403) is vertically downward, and the anti-leakage blocking ball (510) is located directly below the air inlet of the connecting pipe (403).

5. The liquefied petroleum gas cylinder valve according to claim 1, characterized in that: A medium is placed between the first piston (505) and the second piston (508) in the fixed tube (504).

6. The liquefied petroleum gas cylinder valve according to claim 1, characterized in that: The bottom of the annular cylinder (401) is provided with an air flow hole (513), a bottom vertical hole (514), and a top vertical hole. The diameter of the bottom vertical hole (514) is larger than that of the top vertical hole. A piston tube (515) having the same inner diameter as the top vertical hole is fixed to the top of the top vertical hole. A crossbar (518) is fixed to the side of the top plate (509), a connecting rod (517) is fixed to the bottom end of the crossbar (518), and a third piston (516) adapted to the piston tube (515) is fixed to the bottom end of the connecting rod (517); A gate groove (519) is provided on the tube body of the connecting pipe (403), a gate plate (520) is movably inserted into the gate groove (519), and the gate plate (520) is fixed to the cross bar (518) via a vertical bar.

7. The liquefied petroleum gas cylinder valve according to claim 1, characterized in that: A groove is provided in the air inlet pipe (2), and the bottom spherical surface of the flow blocking ball (6) is adapted to the groove.

8. A liquefied petroleum gas cylinder valve according to claim 1 or 7, characterized in that: A reducing pipe (801) is fixed in the air inlet pipe (2), and a downwardly inclined vent pipe (802) is fixedly connected to the side of the reducing pipe (801), and the aperture of the vent pipe (802) is smaller than the diameter of the flow blocking ball (6), and the extension line of the central axis of the vent pipe (802) is located at the bottom of the flow blocking ball (6).

9. The liquefied petroleum gas cylinder valve according to claim 1, characterized in that: A slope (404) is provided on the outside of the through hole of the gas blocking head (4), a magnet (405) is provided inside the gas blocking head (4), and a magnetic conductive layer (601) is provided on the outer surface of the flow blocking ball (6), and the magnet (405) and the magnetic conductive layer (601) are attracted to each other.

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