Electromagnetic valve

Abstract

The invention relates to an electromagnetic valve, and relates to the technical field of electromagnetic valves, the electromagnetic valve comprises an electromagnetic valve shell, a connecting seat is fixedly arranged at the right end of the electromagnetic valve shell, a pipeline mounting seat is fixedly connected to the right end of the connecting seat, and a pressure relief non-return assembly is arranged in the pipeline mounting seat; and an electromagnetic driving assembly is arranged in the electromagnetic valve shell. By arranging the unloading assembly composed of the positioning sleeve, the first buffering thread, the second buffering thread and the like, the service life of the electromagnetic valve is effectively prolonged, and the stability of the electromagnetic valve is effectively improved. When the electromagnetic valve works, the movable valve rod bears tensile force and drives the positioning sleeve to move, and impact force generated when the positioning sleeve impacts the annular positioning seat can be dispersed to the surfaces of the first buffering threads on the movable valve rod and the second buffering threads on the inner wall of the positioning sleeve. Due to the fact that the first buffering threads and the second buffering threads are matched with each other and distributed in a staggered mode, impact force can be evenly dispersed, and the tensile strength of the movable valve rod is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of solenoid valve technology, and in particular to a solenoid valve. Background Technology

[0002] Solenoid valves, as key components in fluid control, are widely used in automation control, hydraulic and pneumatic systems, and other applications. Their core function is to control the on / off state of pipelines by driving the valve core with electromagnetic force. However, traditional solenoid valves commonly suffer from the following technical problems during long-term, high-frequency operation: 1. The moving valve stem is prone to fatigue fracture. In traditional solenoid valves, the moving valve stem and the positioning sleeve are often rigidly connected or simply threaded. When the solenoid valve is frequently opened or closed, the moving valve stem moves repeatedly under the action of electromagnetic force and return spring, generating a continuous impact force between the positioning sleeve and the annular positioning seat. This impact force is concentrated at the connection between the moving valve stem and the positioning sleeve, which can easily lead to excessive local stress on the moving valve stem. After long-term use, fatigue wear or even fracture may occur, which can then cause valve core detachment, pipeline leakage, and other malfunctions, seriously affecting the service life and reliability of the solenoid valve.

[0003] 2. The pressure relief and check valve functions of traditional solenoid valves usually need to be achieved through separate pressure relief valves and check valves, which means that multiple additional components need to be installed in the pipeline system. This not only increases the complexity of the overall structure and installation cost, but may also reduce the sealing performance due to mismatch between components.

[0004] To address this, we designed a new type of solenoid valve that improves the durability of core components while integrating pressure relief and backflow prevention functions and optimizing sealing performance. Summary of the Invention

[0005] The purpose of this application is to provide a solenoid valve.

[0006] Firstly, the solenoid valve provided in this application adopts the following technical solution: An electromagnetic valve includes a solenoid valve housing, a connecting seat fixedly disposed at the right end of the solenoid valve housing, a pipeline mounting seat fixedly connected to the right end of the connecting seat, a pressure relief and backflow prevention component disposed inside the pipeline mounting seat, an electromagnetic drive component disposed inside the solenoid valve housing, and an unloading component disposed inside the connecting seat. The electromagnetic drive assembly includes an electromagnetic mounting base fixedly installed on the inner wall of the solenoid valve housing. The electromagnetic mounting base has a sliding limiting groove inside. An electromagnet is fixedly installed on the inner wall of the sliding limiting groove, and a movable valve stem is slidably installed on the inner wall of the sliding limiting groove. The unloading assembly includes a positioning sleeve fixedly connected to the end of the movable valve stem. A plurality of first buffer threads are fixedly installed on the surface of the movable valve stem. The positions of the first buffer threads correspond to those of the positioning sleeve. A plurality of second buffer threads are fixedly installed on the inner wall of the positioning sleeve. The first buffer threads and the second buffer threads match each other, and the plurality of first buffer threads and second buffer threads are staggered between the movable valve stem and the positioning sleeve.

[0007] Preferably, the positioning sleeve and the movable valve stem are threaded together by a first buffer thread and a second buffer thread. A wire retaining ring is fitted on the surface of the movable valve stem. The wire retaining ring is disposed between the inner wall of the positioning sleeve and the first buffer thread. An annular positioning seat is fixedly embedded on the right side of the solenoid valve housing. The position of the annular positioning seat corresponds to that of the positioning sleeve, and the annular positioning seat is fitted on the surface of the movable valve stem. The annular positioning seat is used to limit the positioning sleeve.

[0008] Preferably, the connecting seat has a transfer air chamber inside, the positioning sleeve is located inside the transfer air chamber, and the right end of the movable valve rod extends into the transfer air chamber. The right inner wall of the transfer air chamber has a connecting air hole.

[0009] Preferably, the pressure relief and backflow prevention assembly includes a buffer cavity formed inside the pipeline mounting base. A conical spring and a movable disc are fixedly installed on the inner wall of the buffer cavity. A rubber valve flap is fixedly connected to the surface of the movable disc. A sealing valve core is fixedly connected to the surface of the rubber valve flap. An L-shaped pressure relief channel is formed inside the pipeline mounting base. The position of the sealing valve core corresponds to the L-shaped pressure relief channel. An air outlet is formed on the inner wall of the L-shaped pressure relief channel. The position of the air outlet corresponds to the connecting air outlet, and the output end of the connecting air outlet is connected to the input end of the air outlet. An air inlet is formed inside the pipeline mounting base.

[0010] Preferably, the size of the sealing valve core matches the port of the L-shaped pressure relief channel, and the sealing valve core is inserted into the inner wall of the port of the L-shaped pressure relief channel. One end of the conical spring is fixedly connected to the inner wall of the buffer cavity, and the other end of the conical spring is fixedly connected to the side surface of the movable disc away from the rubber valve flap. The outer edge of the rubber valve flap is fixedly connected to the inner wall of the buffer cavity, and the rubber valve flap forms a partition between the buffer cavity and the L-shaped pressure relief channel.

[0011] Preferably, the bottom end of the pipe mounting base is provided with an air inlet cavity, one end of the air inlet hole extends into the interior of the air inlet cavity, and the other end of the air inlet hole extends into the interior of the buffer cavity. The air inlet hole connects the interior of the buffer cavity and the interior of the air inlet cavity. The bottom end of the pipe mounting base is provided with an air inlet pipe thread groove, and the top end of the pipe mounting base is provided with an air outlet pipe thread groove. The air inlet pipe thread groove and the air outlet pipe thread groove are used to install the air inlet pipe and the air outlet pipe, respectively.

[0012] Preferably, the end of the movable valve stem is provided with a cylindrical mounting groove, and a return spring is fixedly connected to the inner wall of the cylindrical mounting groove. The other end of the return spring is fixedly connected to the inner wall of the sliding limit groove.

[0013] Preferably, the inner wall of the buffer cavity is provided with an air guide hole, and the end of the air guide hole away from the buffer cavity extends into the interior of the transfer air cavity.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. By incorporating an unloading assembly consisting of a positioning sleeve, a first buffer thread, and a second buffer thread, the service life and stability of the solenoid valve are effectively improved. When the solenoid valve operates, the moving valve stem bears tensile force and drives the positioning sleeve to move. The impact force generated by the positioning sleeve striking the annular positioning seat is dispersed onto the first buffer thread on the moving valve stem and the second buffer thread surface on the inner wall of the positioning sleeve. Because the first and second buffer threads are matched and staggered, the impact force is evenly distributed, significantly improving the tensile strength of the moving valve stem and greatly reducing the risk of valve core detachment due to valve stem breakage. Under the same impact force, this structure results in a longer tensile fatigue life of the moving valve stem compared to traditional structures, thereby extending the overall service life of the solenoid valve. 2. By incorporating a pressure relief and backflow prevention component, when the solenoid valve is closed, the movable valve stem blocks the connecting air port and the air guide port. The conical spring pushes the movable disc, causing the rubber valve disc to tightly seal the port of the L-shaped pressure relief channel, preventing gas from flowing backward and achieving the backflow prevention function. When the solenoid valve is open, the movable valve stem extends and retracts, allowing gas to enter the buffer cavity from the air inlet, then the transfer chamber from the air guide port, and finally return to the L-shaped pressure relief channel for external discharge. When the pressure in the output pipeline rises abnormally, the high-pressure gas flows back into the L-shaped pressure relief channel, accumulating and pushing the movable disc to compress the conical spring, causing the sealing valve core to separate from the L-shaped pressure relief channel. The high-pressure gas then enters the air inlet cavity through the L-shaped pressure relief channel and the buffer cavity, completing the pressure relief. After the pressure recovers, the conical spring resets, and the sealing valve core re-seals the channel. This simultaneously achieves pressure relief and backflow prevention functions without the need for additional independent components, simplifying the pipeline structure and reducing installation costs. The edge of the rubber valve disc is fixed to the inner wall of the buffer cavity, forming an effective barrier between the buffer cavity and the L-shaped pressure relief channel, improving sealing reliability and preventing gas leakage. Adaptive pressure regulation, through the dynamic balance between the spring force of the conical spring and the gas pressure, achieves automatic pressure relief and reset, with rapid response, ensuring stable pipeline pressure and avoiding equipment damage due to overpressure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall front view structure of this application; Figure 2 This is a schematic diagram of the overall side view structure of this application; Figure 3 This is a schematic diagram of the overall bottom view of this application; Figure 4 This is a schematic diagram of the front section structure of this application; Figure 5 yes Figure 4 Enlarged structural diagram at point A; Figure 6 yes Figure 4 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the front section structure of the pipe mounting bracket; Explanation of reference numerals in the attached drawings: 1. Solenoid valve housing; 2. Connecting seat; 3. Pipeline mounting seat; 4. Pressure relief and check valve assembly; 5. Solenoid drive assembly; 6. Unloading assembly; 201. Transfer air chamber; 202. Connecting air port; 301. Intake cavity; 302. Intake pipe threaded groove; 303. Exit pipe threaded groove; 401. Buffer cavity; 402. Conical spring; 403. Movable disc; 404. Rubber valve flap; 405. Sealing valve core; 406. L-shaped pressure relief channel; 407. Air outlet; 408. Air inlet; 409. Air guide hole; 501. Electromagnetic mounting base; 502. Sliding limit groove; 503. Electromagnet; 504. Movable valve stem; 505. Columnar mounting groove; 506. Return spring; 601. Positioning sleeve; 602. First buffer thread; 603. Second buffer thread; 604. Wire retaining ring; 605. Annular positioning seat. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0017] An electromagnetic valve according to this application includes an electromagnetic valve housing 1, a connecting seat 2 fixedly disposed at the right end of the electromagnetic valve housing 1, a pipeline mounting seat 3 fixedly connected to the right end of the connecting seat 2, a pressure relief and backflow prevention component 4 disposed inside the pipeline mounting seat 3, an electromagnetic drive component 5 disposed inside the electromagnetic valve housing 1, and an unloading component 6 disposed inside the connecting seat 2.

[0018] The electromagnetic drive assembly 5 includes an electromagnetic mounting base 501 fixedly installed on the inner wall of the solenoid valve housing 1. A sliding limiting groove 502 is provided inside the electromagnetic mounting base 501, providing space and guidance for the sliding of the movable valve stem 504, ensuring stable axial movement of the movable valve stem 504. An electromagnet 503 is fixedly installed on the inner wall of the sliding limiting groove 502. As the core component of the electromagnetic drive, the electromagnet 503 generates magnetic force when energized, driving the movable valve stem 504 to move. The movable valve stem 504 is slidably mounted on the inner wall of the sliding limiting groove 502. A cylindrical mounting groove 505 is provided at the end of the movable valve stem 504, providing an installation position for the return spring 506, ensuring stable operation of the return spring 506. A return spring 506 is fixedly connected to the inner wall of the cylindrical mounting groove 505. The other end of the return spring 506 is fixedly connected to the inner wall of the sliding limit groove 502. When the electromagnet 503 is de-energized, the return spring 506 can drive the movable valve stem 504 to quickly reset, ensuring the normal closing of the solenoid valve and improving the response speed and working reliability of the solenoid valve.

[0019] The unloading assembly 6 includes a positioning sleeve 601 fixedly connected to the end of the movable valve stem 504. Several first buffer threads 602 are fixedly provided on the surface of the movable valve stem 504, corresponding to the positions of the positioning sleeve 601. Several second buffer threads 603 are fixedly provided on the inner wall of the positioning sleeve 601. The first buffer threads 602 and second buffer threads 603 are matched to each other, and the several first buffer threads 602 and second buffer threads 603 are staggered between the movable valve stem 504 and the positioning sleeve 601. This staggered distribution structure can evenly disperse the impact force, thereby significantly improving the tensile strength of the movable valve stem 504 and greatly reducing the risk of valve core detachment due to breakage of the movable valve stem 504. The positioning sleeve 601 and the movable valve stem 504 are threadedly connected through the first buffer threads 602 and second buffer threads 603. This threaded connection makes the connection between the positioning sleeve 601 and the movable valve stem 504 more secure and facilitates installation and disassembly.

[0020] A wire retaining ring 604 is fitted onto the surface of the movable valve stem 504. The wire retaining ring 604 is positioned between the inner wall of the positioning sleeve 601 and the first buffer thread 602. The wire retaining ring 604 further limits and fixes the positioning sleeve 601, preventing it from loosening or shifting during movement and enhancing the stability of the unloading assembly 6. An annular positioning seat 605 is fixedly embedded on the right side of the solenoid valve housing 1. The position of the annular positioning seat 605 corresponds to that of the positioning sleeve 601, and the annular positioning seat 605 is fitted onto the surface of the movable valve stem 504. The annular positioning seat 605 limits the positioning sleeve 601, preventing it from moving excessively and affecting the normal operation of other components, thus ensuring the stability of the entire solenoid valve structure.

[0021] The connecting seat 2 has an internal transfer air chamber 201. The positioning sleeve 601 is located inside the transfer air chamber 201, and the right end of the movable valve stem 504 extends into the transfer air chamber 201. The transfer air chamber 201 provides space for gas flow and buffering, allowing gas to flow more smoothly between various components. The right inner wall of the transfer air chamber 201 has a connecting air hole 202, which is an important channel for gas to enter the pipeline mounting seat 3 from the connecting seat 2, ensuring smooth gas flow.

[0022] The pressure relief and check valve assembly 4 includes a buffer cavity 401 formed inside the pipeline mounting base 3. The buffer cavity 401 provides space for gas buffering and pressure regulation, helping to stabilize the pressure within the pipeline. A conical spring 402 and a movable disc 403 are fixedly installed on the inner wall of the buffer cavity 401. The conical spring 402 can elastically deform according to changes in gas pressure, thereby driving the movable disc 403 to move, achieving automatic pressure relief and reset functions. A rubber valve disc 404 is fixedly connected to the surface of the movable disc 403. The rubber valve disc 404 has good elasticity and sealing properties, effectively blocking gas flow between the buffer cavity 401 and the L-shaped pressure relief channel 406. A sealing valve core 405 is fixedly connected to the surface of the rubber valve disc 404. The sealing valve core 405 can tightly cooperate with the port of the L-shaped pressure relief channel 406 to achieve a seal on the L-shaped pressure relief channel 406.

[0023] The pipeline mounting base 3 has an L-shaped pressure relief channel 406 inside, which provides a path for the pressure relief of high-pressure gas, ensuring that high-pressure gas can be discharged in a timely manner when the pressure is abnormal. The position of the sealing valve core 405 corresponds to the L-shaped pressure relief channel 406, and the size of the sealing valve core 405 matches the port of the L-shaped pressure relief channel 406. The sealing valve core 405 is inserted into the inner wall of the port of the L-shaped pressure relief channel 406. This structure ensures that the sealing valve core 405 can effectively seal the L-shaped pressure relief channel 406 and prevent gas leakage. One end of the conical spring 402 is fixedly connected to the inner wall of the buffer cavity 401, and the other end of the conical spring 402 is fixedly connected to the side surface of the movable disc 403 away from the rubber valve flap 404. The outer edge of the rubber valve flap 404 is fixedly connected to the inner wall of the buffer cavity 401. The rubber valve flap 404 forms a partition between the buffer cavity 401 and the L-shaped pressure relief channel 406, which improves the sealing reliability and prevents gas from flowing freely between the buffer cavity 401 and the L-shaped pressure relief channel 406.

[0024] The inner wall of the L-shaped pressure relief channel 406 has an outlet 407, which corresponds to the position of the connecting air hole 202. The output end of the connecting air hole 202 is connected to the input end of the outlet 407, ensuring that gas can smoothly enter the L-shaped pressure relief channel 406 from the connecting seat 2. The inside of the pipeline mounting seat 3 has an inlet 408, which is the channel for gas to enter the buffer cavity 401. The inner wall of the buffer cavity 401 has a guide hole 409, the end of which extends away from the buffer cavity 401 into the interior of the transfer air chamber 201. The guide hole 409 provides a path for gas to enter the transfer air chamber 201 from the buffer cavity 401, realizing the circulation of gas.

[0025] The bottom end of the pipe mounting base 3 has an air inlet cavity 301. One end of the air inlet hole 408 extends into the interior of the air inlet cavity 301, and the other end extends into the interior of the buffer cavity 401. The air inlet hole 408 connects the buffer cavity 401 and the interior of the air inlet cavity 301, allowing gas to enter the buffer cavity 401 from the air inlet cavity 301 through the air inlet hole 408. The bottom end of the pipe mounting base 3 has an air inlet pipe threaded groove 302, and the top end of the pipe mounting base 3 has an air outlet pipe threaded groove 303. The air inlet pipe threaded groove 302 and the air outlet pipe threaded groove 303 are used to install the air inlet pipe and the air outlet pipe, respectively. The threaded connection facilitates the installation and disassembly of the pipe while ensuring the sealing of the connection.

[0026] The implementation principle of this embodiment is as follows: When the solenoid valve is opened, the electromagnet 503 is energized to generate magnetic force, attracting the movable valve rod 504 to slide within the sliding limit groove 502. At this time, the return spring 506 is compressed. The movement of the movable valve rod 504 prevents it from blocking the connecting air hole 202 and the air guide hole 409. Gas enters the air intake cavity 301 from the air intake pipe connected to the air intake pipe thread groove 302, and then enters the buffer cavity 401 through the air intake hole 408. Part of the gas entering the buffer cavity 401 enters the transfer cavity 201 through the air guide hole 409, then enters the L-shaped pressure relief channel 406 through the connecting air hole 202 and the air outlet hole 407, and finally exits from the air outlet pipe connected to the air outlet pipe thread groove 303; the other part of the gas pushes the movable disc 403, causing the conical spring 402 to compress, the rubber valve disc 404 to deform, and the sealing valve core 405 to separate from the port of the L-shaped pressure relief channel 406, and the gas can also be discharged from the air outlet pipe through the L-shaped pressure relief channel 406.

[0027] When the solenoid valve is closed, the electromagnet 503 is de-energized, the return spring 506 returns to its original state, and pushes the movable valve stem 504 to reset. The movable valve stem 504 blocks the connecting air port 202 and the air guide port 409. At this time, the conical spring 402 pushes the movable disc 403, causing the rubber valve disc 404 to drive the sealing valve core 405 to tightly seal the port of the L-shaped pressure relief channel 406, preventing gas from flowing backward and achieving the anti-reverse function.

[0028] When the pressure in the output pipeline rises abnormally, high-pressure gas flows back to the L-shaped pressure relief channel 406 and accumulates. The high-pressure gas pushes the movable disc 403 to compress the conical spring 402, causing the sealing valve core 405 to separate from the L-shaped pressure relief channel 406. The high-pressure gas then enters the intake cavity 301 through the L-shaped pressure relief channel 406 and the buffer cavity 401, completing the pressure relief. When the pressure returns to normal, the conical spring 402 resets, pushing the movable disc 403, the rubber valve disc 404, and the sealing valve core 405 back to their original positions. The sealing valve core 405 reseals the port of the L-shaped pressure relief channel 406, ensuring the normal operation of the solenoid valve.

[0029] Throughout the entire operation, the unloading assembly 6 plays a crucial role. When the movable valve stem 504 is subjected to tension and drives the positioning sleeve 601 to move, the impact force generated by the positioning sleeve 601 striking the annular positioning seat 605 is dispersed onto the surfaces of the first buffer thread 602 on the movable valve stem 504 and the second buffer thread 603 on the inner wall of the positioning sleeve 601. Because the first buffer thread 602 and the second buffer thread 603 are matched and staggered, the impact force can be evenly distributed, significantly improving the tensile strength of the movable valve stem 504, reducing the risk of breakage, and extending the service life of the solenoid valve. Simultaneously, the wire retaining ring 604 further limits and fixes the positioning sleeve 601, ensuring the stable operation of the unloading assembly 6.

Claims

1. A solenoid valve, comprising a solenoid valve housing (1), characterized in that, A connecting seat (2) is fixedly provided at the right end of the solenoid valve housing (1), and a pipeline mounting seat (3) is fixedly connected at the right end of the connecting seat (2). A pressure relief and backflow prevention assembly (4) is provided inside the pipeline mounting seat (3), an electromagnetic drive assembly (5) is provided inside the solenoid valve housing (1), and an unloading assembly (6) is provided inside the connecting seat (2). The electromagnetic drive assembly (5) includes an electromagnetic mounting base (501) fixedly installed on the inner wall of the electromagnetic valve housing (1). A sliding limiting groove (502) is provided inside the electromagnetic mounting base (501). An electromagnet (503) is fixedly installed on the inner wall of the sliding limiting groove (502), and a movable valve stem (504) is slidably installed on the inner wall of the sliding limiting groove (502). The unloading assembly (6) includes a positioning sleeve (601) fixedly connected to the end of the movable valve stem (504). 04) has a number of first buffer threads (602) fixedly provided on its surface. The positions of the first buffer threads (602) correspond to those of the positioning sleeve (601). The inner wall of the positioning sleeve (601) has a number of second buffer threads (603) fixedly provided. The first buffer threads (602) and the second buffer threads (603) match each other, and the number of first buffer threads (602) and second buffer threads (603) are staggered between the movable valve stem (504) and the positioning sleeve (601).

2. The solenoid valve according to claim 1, characterized in that, The positioning sleeve (601) and the movable valve stem (504) are threaded together by the first buffer thread (602) and the second buffer thread (603). A wire retaining ring (604) is fitted on the surface of the movable valve stem (504). The wire retaining ring (604) is located between the inner wall of the positioning sleeve (601) and the first buffer thread (602). An annular positioning seat (605) is fixedly embedded on the right side of the solenoid valve housing (1). The position of the annular positioning seat (605) corresponds to that of the positioning sleeve (601), and the annular positioning seat (605) is fitted on the surface of the movable valve stem (504). The annular positioning seat (605) is used to limit the positioning sleeve (601).

3. A solenoid valve according to claim 2, characterized in that, The connecting seat (2) has a transfer air chamber (201) inside, the positioning sleeve (601) is located inside the transfer air chamber (201), and the right end of the movable valve stem (504) extends into the transfer air chamber (201). The inner wall of the right side of the transfer air chamber (201) has a connecting air hole (202).

4. A solenoid valve according to claim 3, characterized in that, The pressure relief and backflow prevention assembly (4) includes a buffer cavity (401) opened inside the pipeline mounting base (3). A conical spring (402) and a movable disc (403) are fixedly installed on the inner wall of the buffer cavity (401). A rubber valve disc (404) is fixedly connected to the surface of the movable disc (403). A sealing valve core (405) is fixedly connected to the surface of the rubber valve disc (404). An L-shaped pressure relief channel (406) is opened inside the pipeline mounting base (3).

5. A solenoid valve according to claim 4, characterized in that, The position of the sealing valve core (405) corresponds to the L-shaped pressure relief channel (406). The inner wall of the L-shaped pressure relief channel (406) is provided with an air outlet (407). The position of the air outlet (407) corresponds to the connecting air hole (202), and the output end of the connecting air hole (202) is connected to the input end of the air outlet (407). The inside of the pipeline mounting base (3) is provided with an air inlet (408).

6. A solenoid valve according to claim 5, characterized in that, The size of the sealing valve core (405) matches the port of the L-shaped pressure relief channel (406), and the sealing valve core (405) is inserted into the inner wall of the port of the L-shaped pressure relief channel (406). One end of the conical spring (402) is fixedly connected to the inner wall of the buffer cavity (401), and the other end of the conical spring (402) is fixedly connected to the side surface of the movable disc (403) away from the rubber valve flap (404). The outer edge of the rubber valve flap (404) is fixedly connected to the inner wall of the buffer cavity (401). The rubber valve flap (404) forms a partition between the buffer cavity (401) and the L-shaped pressure relief channel (406).

7. A solenoid valve according to claim 6, characterized in that, The bottom end of the pipeline mounting base (3) is provided with an air inlet cavity (301), one end of the air inlet hole (408) extends into the interior of the air inlet cavity (301), and the other end of the air inlet hole (408) extends into the interior of the buffer cavity (401).

8. A solenoid valve according to claim 7, characterized in that, The air inlet (408) connects the buffer cavity (401) and the air inlet cavity (301). The bottom end of the pipe mounting base (3) is provided with an air inlet pipe thread groove (302), and the top end of the pipe mounting base (3) is provided with an air outlet pipe thread groove (303). The air inlet pipe thread groove (302) and the air outlet pipe thread groove (303) are used to install the air inlet pipe and the air outlet pipe, respectively.

9. A solenoid valve according to claim 8, characterized in that, The end of the movable valve stem (504) is provided with a cylindrical mounting groove (505), and a return spring (506) is fixedly connected to the inner wall of the cylindrical mounting groove (505). The other end of the return spring (506) is fixedly connected to the inner wall of the sliding limit groove (502).

10. A solenoid valve according to claim 9, characterized in that, The inner wall of the buffer cavity (401) is provided with an air guide hole (409), and the end of the air guide hole (409) away from the buffer cavity (401) extends into the interior of the transfer air cavity (201).

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