Piston type large-diameter pilot electromagnetic valve

Abstract

The invention relates to the technical field of electromagnetic valves, and discloses a piston type large-diameter pilot electromagnetic valve which comprises a main valve body, a connecting shell is fixedly connected to the outer wall of the main valve body, a connecting cylinder is in threaded connection with the interior of the connecting shell, a pilot head is fixedly connected to the outer wall of the connecting cylinder, and a controller is electrically connected to the outer wall of the pilot head. A sliding rail is arranged in the connecting cylinder, a pilot valve element is slidably connected to the inner wall of the connecting cylinder, a first telescopic rod is fixedly connected to the inner bottom wall of the pilot valve element, and a first spring is slidably connected to the outer wall of the first telescopic rod. And through precise matching of the sliding rail and the limiting strip, it is ensured that the pilot valve element stably slides in the connecting cylinder along a preset track. The first telescopic rod provides axial limiting, and the first spring achieves reliable resetting, so that the valve element acts more accurately. The double-guide structure effectively prevents the valve element from deviating or clamping stagnation, control precision is remarkably improved, the service life is remarkably prolonged, and the double-guide structure is particularly suitable for high-frequency action working conditions.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, specifically to a piston-type large-diameter pilot solenoid valve. Background Technology

[0002] A solenoid valve is a basic automated component that controls the flow of fluids (liquid or gas) using electromagnetic force. Its core principle is to use the attraction force generated by an electromagnet to drive the valve core, thereby opening or closing the valve to achieve fluid direction control, flow regulation, or pressure protection. In the field of high-pressure, high-flow-rate fluid control, traditional solenoid valves, due to structural limitations, struggle to meet the requirements for rapid response and sealing performance under large-diameter, high-pressure conditions. To ensure sufficient fluid flow and efficient production processes, a piston-type, large-diameter pilot-operated solenoid valve is needed.

[0003] Piston-type large-diameter pilot-operated solenoid valves are a special type of solenoid valve that combines piston structure and pilot-operated principle, and has a large diameter. Ordinary small-diameter solenoid valves, due to their small diameter, cannot meet the requirements of such high flow rate. Traditional solenoid valves mostly rely on the clearance fit between the valve core and the valve seat for guidance. Under high-frequency operation, the clearance is prone to increase due to friction and wear, causing the valve core to deviate. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a piston-type large-diameter pilot solenoid valve, which solves the problem that traditional solenoid valves are prone to valve core misalignment due to increased clearance caused by friction and wear under high-frequency operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A piston-type large-diameter pilot-operated solenoid valve includes a main valve body. A connecting shell is fixedly connected to the outer wall of the main valve body. A connecting cylinder is threadedly connected to the inside of the connecting shell. A pilot head is fixedly connected to the outer wall of the connecting cylinder. A controller is electrically connected to the outer wall of the pilot head. A slide rail is provided inside the connecting cylinder. A pilot valve core is slidably connected to the inner wall of the connecting cylinder. A first telescopic rod is fixedly connected to the inner bottom wall of the pilot valve core. A first spring is slidably connected to the outer wall of the first telescopic rod. A limit strip is fixedly connected to the outer wall of the pilot valve core. A pad is fixedly connected to the bottom end of the pilot valve core. A flow guide block is fixedly connected inside the connecting shell. Pressure guiding holes are provided inside both the main valve body and the flow guide block. A connecting assembly is provided on the outer wall of the main valve body.

[0006] By adopting the above technical solution, the precise cooperation between the slide rail and the limiting strip ensures that the pilot valve core slides smoothly along a predetermined trajectory within the connecting cylinder. The first telescopic rod provides axial limiting, and the first spring ensures reliable reset, making the valve core movement more precise. This dual-guide structure effectively prevents valve core misalignment or jamming, significantly improving control accuracy and service life, and is particularly suitable for high-frequency operating conditions.

[0007] Preferably, the connecting assembly includes an outlet flange and an inlet flange, the outer walls of the outlet flange and the inlet flange are both located on the outer wall of the main valve body, a limiting cylinder is fixedly connected inside the outlet flange and the inlet flange, a locking block is fixedly connected to the inner wall of the limiting cylinder, and a second spring is provided inside the limiting cylinder.

[0008] By adopting the above technical solution, the pipe can be self-adaptively locked by the combination of the locking block and the limiting cylinder, and the elastic deformation of the second spring. Thus, the installation and positioning work can be completed without additional tools, which can significantly shorten the installation time. It is especially suitable for occasions that require frequent disassembly and assembly, while ensuring the connection is firm and the sealing is reliable.

[0009] Preferably, one end of the second spring is fixed to the locking block, and the other end abuts against the inner wall of the limiting cylinder.

[0010] By adopting the above technical solution, the second spring serves as an auxiliary connecting block and the limiting cylinder, thereby ensuring the stability of the block's movement.

[0011] Preferably, the top end of the first telescopic rod is fixedly connected to the inner top wall of the connecting cylinder, one end of the first spring is fixed to the connecting cylinder, and the other end abuts against the inner wall of the pilot valve core, the outer wall of the limiting strip is slidably connected to the inner wall of the slide rail, and the outer wall of the pad is slidably connected to the inner wall of the pressure guiding hole.

[0012] By adopting the above technical solution, the first telescopic rod plays the role of assisting in limiting the pilot valve core, thereby effectively preventing the valve core from shifting or jamming.

[0013] Preferably, a flow guide tube is fixedly connected inside the main valve body, and a diaphragm is fixedly connected to the inner wall of the flow guide tube.

[0014] By adopting the above technical solution, the main valve body serves to limit and fix the guide pipe, thereby ensuring the stability of fluid flow under the action of the guide pipe.

[0015] Preferably, the outer wall of the diaphragm is fixedly connected to a first connecting piece and a second connecting piece, the outer wall of the first connecting piece is fixedly connected to the inner wall of the connecting shell, and the outer wall of the second connecting piece is fixedly connected to the outer wall of the guide block.

[0016] By adopting the above technical solution, the first connecting piece and the second connecting piece act as a limiting diaphragm, thereby ensuring the stability of the diaphragm's reset.

[0017] Preferably, a second telescopic rod is fixedly connected to the upper surface of the diaphragm, the top end of the second telescopic rod is fixedly connected to the inner wall of the connecting shell, and a third spring is slidably connected to the outer wall of the second telescopic rod.

[0018] By adopting the above technical solution, the second telescopic rod serves to connect the diaphragm and the connecting shell, thereby significantly reducing the probability of diaphragm jamming and improving sealing performance.

[0019] Preferably, one end of the third spring is fixedly connected to the upper surface of the diaphragm, and the other end is fixedly connected to the inner wall of the connecting shell.

[0020] By adopting the above technical solution, the third spring serves as an auxiliary connector between the diaphragm and the connecting shell. Under the buffering effect of the third spring, the sealing and disengagement of the diaphragm and the guide tube can be ensured to be stable and reliable.

[0021] Preferably, the main valve body has a first flow channel opening inside, the guide block has a second flow channel opening inside, and a partition is fixedly connected inside the main valve body.

[0022] By adopting the above technical solution, the baffle plays the role of changing the direction of fluid flow. Under the action of the baffle, the fluid can be allowed to flow directly into the main valve body through the guide pipe after passing through the first flow channel.

[0023] Preferably, the spacer is located between the first flow channel opening and the guide tube, and the second connecting piece can be attached to the second flow channel opening when the diaphragm is raised.

[0024] By adopting the above technical solution, the diaphragm slides upward, thereby driving the second connecting piece to block the second flow channel opening, which in turn forces the fluid to change its path.

[0025] Working principle: When the solenoid valve is needed, first install the whole unit in the required position, and connect the whole unit to the corresponding pipeline through the outlet flange and the inlet flange. At this time, the external pipeline will squeeze the locking block to make it slide in the limiting cylinder, which will then squeeze the second spring to retract. Under the rebound of the second spring, the locking block will limit the external pipeline to a certain extent, which can assist the whole unit to connect with the external pipeline, thereby reducing the adjustment time when connecting the pipeline and reducing the installation difficulty. When the controller does not control the pilot valve core in the connecting cylinder to rise via the pilot head, the diaphragm will block the guide tube under the action of the second telescopic rod and the third spring. When the controller controls the pilot valve core in the connecting cylinder to rise via the pilot head, the pilot head will control the pilot valve core to slide upward in the connecting cylinder. At this time, the pilot valve core will drive the limit bar to slide in the slide rail. Under the limit of the first telescopic rod, the pilot valve core will squeeze the first spring to retract. At this time, the pad will slide away from the pressure guide hole, which achieves the effect of improving the movement stability of the pilot valve core. The improved stability can reduce malfunctions caused by vibration or impact and ensure the accurate adjustment of parameters such as flow rate and pressure. The fluid then flows from the connecting shell into the guide block through the first flow channel, then through the pressure guide hole in the guide block into the main valve body, and then into the guide tube in the main valve body. Under pressure, it impacts the diaphragm, and under the limit of the second telescopic rod, it squeezes the third spring to contract, thus allowing the diaphragm to detach from the guide tube. During the upward sliding of the diaphragm, it drives the second connecting piece to block the second flow channel, thus changing the path of the fluid. After passing through the first flow channel, it flows directly into the main valve body through the guide tube and out from the inlet flange. At the same time, the limit of the second telescopic rod also reduces the risk of diaphragm jamming, thereby reducing the frequency of downtime maintenance due to jamming, and reducing spare parts replacement and labor costs.

[0026] This solenoid valve not only improves the stability of the pilot valve core's movement, but also reduces the risk of diaphragm jamming under the limit of the second telescopic rod. It also assists in the overall connection with external pipelines, thereby improving the overall installation efficiency.

[0027] This invention provides a piston-type large-diameter pilot-operated solenoid valve. It has the following beneficial effects: 1. In this invention, the precise cooperation between the slide rail and the limiting strip ensures that the pilot valve core slides smoothly along a predetermined trajectory within the connecting cylinder. The first telescopic rod provides axial limiting, and the first spring achieves reliable reset, making the valve core movement more precise. This dual-guide structure effectively prevents valve core deviation or jamming, significantly improving control accuracy and service life, and is particularly suitable for high-frequency operating conditions.

[0028] 2. In this invention, the second telescopic rod precisely guides the diaphragm's movement trajectory, and the third spring provides cushioning, ensuring stable and reliable sealing and disengagement between the diaphragm and the guide tube. Fluid pressure is evenly distributed through the pressure guide holes, avoiding localized stress concentration. This guiding and pressure-balanced design significantly reduces the probability of diaphragm jamming, improves sealing performance, and ensures the valve's stability during long-term use.

[0029] 3. In this invention, the pipe self-adaptive locking is achieved through a combination of a locking block and a limiting cylinder, utilizing the elastic deformation of a second spring. The standardized design of the outlet and inlet flanges simplifies the connection process. This structure allows for installation and positioning without additional tools, significantly reducing installation time. It is particularly suitable for applications requiring frequent disassembly and assembly, while ensuring a secure connection and reliable sealing. Attached Figure Description

[0030] Figure 1 This is a perspective view of the piston-type large-diameter pilot solenoid valve of the present invention. Figure 2 This is a schematic diagram of the pilot head of the piston-type large-diameter pilot solenoid valve of the present invention. Figure 3 This is a schematic diagram of the flow guide block for the piston-type large-diameter pilot solenoid valve of the present invention. Figure 4 This is a schematic diagram of the pilot valve core of the piston-type large-diameter pilot solenoid valve of the present invention. Figure 5 This is a schematic diagram of the first telescopic rod of the piston-type large-diameter pilot solenoid valve of the present invention. Figure 6 This is a schematic diagram of the limiting cylinder of the piston-type large-diameter pilot solenoid valve of the present invention. Figure 7 This is a schematic diagram of the partition of the piston-type large-diameter pilot solenoid valve of the present invention. Figure 8 This is a schematic diagram of the diaphragm of the piston-type large-diameter pilot solenoid valve of the present invention.

[0031] The components are as follows: 1. Main valve body; 2. Connecting shell; 3. Connecting cylinder; 4. Pilot head; 5. Controller; 6. Slide rail; 7. Pilot valve core; 8. First telescopic rod; 9. First spring; 10. Limiting strip; 11. Guide block; 12. Gasket; 13. Outlet flange; 14. Inlet flange; 15. Limiting cylinder; 16. Locking block; 17. Second spring; 18. Guide tube; 19. Diaphragm; 20. First connecting piece; 21. Second connecting piece; 22. Second telescopic rod; 23. Third spring; 24. Partition; 25. First flow channel opening; 26. Second flow channel opening; 27. Pressure guide hole; 28. Connecting assembly. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see the appendix Figure 1 - Appendix Figure 5This invention provides a piston-type large-diameter pilot solenoid valve, including a main valve body 1. A connecting shell 2 is fixedly connected to the outer wall of the main valve body 1. A connecting cylinder 3 is threadedly connected to the inside of the connecting shell 2. A pilot head 4 is fixedly connected to the outer wall of the connecting cylinder 3. A controller 5 is electrically connected to the outer wall of the pilot head 4. A slide rail 6 is provided inside the connecting cylinder 3. A pilot valve core 7 is slidably connected to the inner wall of the connecting cylinder 3. A first telescopic rod 8 is fixedly connected to the inner bottom wall of the pilot valve core 7. A first spring 9 is slidably connected to the outer wall of the first telescopic rod 8. A limit strip 10 is fixedly connected to the outer wall of the pilot valve core 7. A pad 12 is fixedly connected to the bottom end of the pilot valve core 7. A flow guide block 11 is fixedly connected inside the connecting shell 2. Pressure guide holes 27 are provided inside both the main valve body 1 and the flow guide block 11. A connecting assembly 28 is provided on the outer wall of the main valve body 1.

[0034] Specifically, the controller 5, through the pilot head 4, controls the lifting of the pilot valve core 7 in the connecting cylinder 3. The controller 5, via the pilot head 4, generates electromagnetic driving force through a pilot control module composed of an electromagnetic coil and an armature, precisely controlling the lifting and lowering of the pilot valve core 7 within the connecting cylinder 3. When the controller 5 is energized, the armature of the pilot head 4 is displaced under the electromagnetic force, causing the pilot valve core 7 to move linearly along the inner cavity of the connecting cylinder 3, achieving reliable lifting and resetting of the valve core. The pilot head 4 controls the pilot valve core 7 to slide upwards within the connecting cylinder 3. At this time, the pilot valve core 7 drives the limit bar 10 to slide within the slide rail 6, where the slide rail 6, through the limit bar 10, limits the movement of the pilot valve core 7. The movement trajectory of the pilot valve core 7 effectively prevents valve core deviation or jamming, significantly improving control accuracy and service life. Under the limiting action of the first telescopic rod 8, the pilot valve core 7 squeezes the first spring 9 to contract. At this time, the pad 12 will slide away from the pressure guide hole 27, and the fluid will flow from the connecting shell 2 to the guide block 11 through the first flow channel 25, and then flow to the main valve body 1 through the pressure guide hole 27 in the guide block 11. The precise cooperation between the slide rail 6 and the limiting strip 10 ensures that the pilot valve core slides smoothly along the predetermined trajectory in the connecting cylinder 3. The first telescopic rod 8 provides axial limiting, and the first spring 9 achieves reliable reset, making the pilot valve core 7 move more accurately.

[0035] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 6 The connecting assembly 28 includes an outlet flange 13 and an inlet flange 14. The outer walls of both the outlet flange 13 and the inlet flange 14 are located on the outer wall of the main valve body 1. A limit cylinder 15 is fixedly connected inside both the outlet flange 13 and the inlet flange 14. A locking block 16 is fixedly connected to the inner wall of the limit cylinder 15. A second spring 17 is provided inside the limit cylinder 15. One end of the second spring 17 is fixed to the locking block 16, and the other end abuts against the inner wall of the limit cylinder 15.

[0036] Specifically, the outlet flange 13 and inlet flange 14 connect the entire assembly to the corresponding pipeline. The external pipeline then compresses the locking block 16, causing it to slide within the limiting cylinder 15. The special inner diameter design of the limiting cylinder 15 prevents the locking block 16 from being ejected by the second spring 17. A narrowing section near the opening of the limiting cylinder 15 forms a mechanical stop surface, limiting the maximum displacement of the locking block 16 and compressing the second spring 17. Under the rebound of the second spring 17, the locking block 16 provides a certain degree of restriction to the external pipeline, thus assisting in the connection between the entire assembly and the external pipeline. Through the combined structure of the locking block 16 and the limiting cylinder 15, and the elastic deformation of the second spring 17, the pipeline achieves self-adaptive locking, allowing installation and positioning to be completed without additional tools, significantly shortening installation time while ensuring a strong connection and reliable sealing. The second spring 17 also assists in connecting the locking block 16 and the limiting cylinder 15, ensuring the stability of the locking block 16's movement.

[0037] Please see the appendix Figure 5 The top end of the first telescopic rod 8 is fixedly connected to the inner top wall of the connecting cylinder 3. One end of the first spring 9 is fixed to the connecting cylinder 3, and the other end abuts against the inner wall of the pilot valve core 7. The outer wall of the limiting strip 10 is slidably connected to the inner wall of the slide rail 6, and the outer wall of the pad 12 is slidably connected to the inner wall of the pressure guiding hole 27.

[0038] Specifically, the first telescopic rod 8 serves as an auxiliary limiter for the pilot valve core 7, thereby ensuring the stability of the pilot valve core 7's movement and effectively preventing the valve core 7 from shifting or jamming. The pad 12 acts as a block to block the pressure guide hole 27. The pad 12 is a key sealing element, and its conical end face forms a line contact seal with the valve seat of the pressure guide hole 27.

[0039] Please see the appendix Figure 1 Appendix Figure 3 Appendix Figure 7 and attached Figure 8A guide pipe 18 is fixedly connected inside the main valve body 1, and a diaphragm 19 is fixedly connected to the inner wall of the guide pipe 18. A first connecting piece 20 and a second connecting piece 21 are fixedly connected to the outer wall of the diaphragm 19. The outer wall of the first connecting piece 20 is fixedly connected to the inner wall of the connecting shell 2, and the outer wall of the second connecting piece 21 is fixedly connected to the outer wall of the guide block 11. A second telescopic rod 22 is fixedly connected to the upper surface of the diaphragm 19, and the top end of the second telescopic rod 22 is fixedly connected to the inner wall of the connecting shell 2. A third spring 23 is slidably connected to the outer wall of the rod 22; one end of the third spring 23 is fixedly connected to the upper surface of the diaphragm 19, and the other end is fixedly connected to the inner wall of the connecting shell 2; a first flow channel 25 is opened inside the main valve body 1, a second flow channel 26 is opened inside the guide block 11, and a partition 24 is fixedly connected inside the main valve body 1; the partition 24 is located between the first flow channel 25 and the guide tube 18, and the second connecting piece 21 can be attached to the second flow channel 26 when the diaphragm 19 is raised.

[0040] Specifically, when the controller 5 raises the pilot valve core 7 in the connecting cylinder 3 via the pilot head 4, the fluid flows into the guide pipe 18 in the main valve body 1. The flow channel design of the guide pipe 18 ensures that the fluid directionally impacts the diaphragm 19. Under pressure, the fluid impacts the diaphragm 19. Under the limitation of the second telescopic rod 22, the third spring 23 is compressed and contracted, allowing the diaphragm 19 to detach from the guide pipe 18. Under the precise guidance and stroke limitation of the second telescopic rod 22, the diaphragm 19 can smoothly compress the third spring 23 to achieve axial displacement. During the upward sliding of the diaphragm 19, the second connecting piece 21 blocks the second flow channel opening 26, forcing the fluid to change its path. After passing through the first flow channel opening 25, the fluid flows directly into the main valve body 1 through the guide pipe 18 and out from the inlet flange 14. The telescopic rod 22 precisely guides the movement trajectory of the diaphragm 19, and in conjunction with the buffering effect of the third spring 23, ensures a stable and reliable sealing and disengagement action between the diaphragm 19 and the guide tube 18. The third spring 23 assists in connecting the diaphragm 19 and the connecting shell 2, and its buffering effect ensures a stable and reliable sealing and disengagement action between the diaphragm 19 and the guide tube 18. The second telescopic rod 22 connects the diaphragm 19 and the connecting shell 2, significantly reducing the probability of diaphragm 19 jamming and improving sealing performance. The first connecting piece 20 and the second connecting piece 21 limit the movement of the diaphragm 19, ensuring the stability of the diaphragm 19's reset. The main valve body 1 limits and fixes the guide tube 18, ensuring the stability of fluid flow under the action of the guide tube 18.

[0041] In this embodiment, the piston-type large-diameter pilot solenoid valve is first installed in the required position. The valve is then connected to the corresponding pipeline through the outlet flange 13 and the inlet flange 14. At this time, the external pipeline will squeeze the locking block 16 to slide in the limiting cylinder 15, which will then squeeze the second spring 17 to retract. Under the rebound of the second spring 17, the locking block 16 will limit the external pipeline to a certain extent, thereby assisting the connection between the valve and the external pipeline. When the controller 5 does not control the pilot valve core 7 in the connecting cylinder 3 to rise through the pilot head 4, the diaphragm 19 will block the guide tube 18 under the action of the second telescopic rod 22 and the third spring 23. When the controller 5 controls the pilot valve core 7 in the connecting cylinder 3 to rise through the pilot head 4, the pilot valve core 7 will slide upward in the connecting cylinder 3 through the pilot head 4. At this time, the pilot valve core 7 will drive the limit bar 10 to slide in the slide rail 6. Under the limit of the first telescopic rod 8, the pilot valve core 7 will squeeze the first spring 9 to retract. At this time, the pad 12 will slide away from the pressure guide hole 27. The fluid then flows through the first flow channel 25 from the flow channel guide block 11 in the connecting shell 2, through the pressure guide hole 27 in the guide block 11 to the main valve body 1, and then into the guide tube 18 in the main valve body 1. Under the action of pressure, it will impact the diaphragm 19. Under the limit of the second telescopic rod 22, it will squeeze the third spring 23 to contract, thereby allowing the diaphragm 19 to detach from the guide tube 18. During the upward sliding of the diaphragm 19, it will drive the second connecting piece 21 to block the second flow channel 26, thereby changing the path of the fluid. After passing through the first flow channel 25, it will directly flow into the main valve body 1 through the guide tube 18 and flow out from the inlet flange 14. This solenoid valve not only improves the stability of the pilot valve core 7's movement, but also reduces the risk of diaphragm 19 jamming under the limit of the second telescopic rod 22. It also assists in the connection between the whole system and external pipelines, thereby improving the overall installation efficiency.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A piston-type large-diameter pilot-operated solenoid valve, comprising a main valve body (1), characterized in that, The outer wall of the main valve body (1) is fixedly connected to a connecting shell (2), the inner wall of the connecting shell (2) is threadedly connected to a connecting cylinder (3), the outer wall of the connecting cylinder (3) is fixedly connected to a pilot head (4), the outer wall of the pilot head (4) is electrically connected to a controller (5), the inner wall of the connecting cylinder (3) is provided with a slide rail (6), the inner wall of the connecting cylinder (3) is slidably connected to a pilot valve core (7), the inner bottom wall of the pilot valve core (7) is fixedly connected to a first telescopic rod (8), the outer wall of the first telescopic rod (8) is slidably connected to a first spring (9), the outer wall of the pilot valve core (7) is fixedly connected to a limit strip (10), the bottom end of the pilot valve core (7) is fixedly connected to a pad (12), the inner wall of the connecting shell (2) is fixedly connected to a flow guide block (11), the inner walls of the main valve body (1) and the flow guide block (11) are both provided with pressure guide holes (27), and the outer wall of the main valve body (1) is provided with a connecting assembly (28).

2. The piston-type large-diameter pilot-operated solenoid valve according to claim 1, characterized in that, The connecting assembly (28) includes an outlet flange (13) and an inlet flange (14). The outer walls of the outlet flange (13) and the inlet flange (14) are both located on the outer wall of the main valve body (1). The interior of the outlet flange (13) and the inlet flange (14) are both fixedly connected to a limiting cylinder (15). The inner wall of the limiting cylinder (15) is fixedly connected to a locking block (16). The interior of the limiting cylinder (15) is provided with a second spring (17).

3. The piston-type large-diameter pilot-operated solenoid valve according to claim 2, characterized in that, One end of the second spring (17) is fixed to the locking block (16), and the other end abuts against the inner wall of the limiting cylinder (15).

4. The piston-type large-diameter pilot-operated solenoid valve according to claim 1, characterized in that, The top end of the first telescopic rod (8) is fixedly connected to the inner top wall of the connecting cylinder (3). One end of the first spring (9) is fixed to the connecting cylinder (3), and the other end abuts against the inner wall of the pilot valve core (7). The outer wall of the limiting strip (10) is slidably connected to the inner wall of the slide rail (6), and the outer wall of the pad (12) is slidably connected to the inner wall of the pressure guiding hole (27).

5. The piston-type large-diameter pilot-operated solenoid valve according to claim 1, characterized in that, The main valve body (1) is fixedly connected to a flow guide tube (18), and a diaphragm (19) is fixedly connected to the inner wall of the flow guide tube (18).

6. The piston-type large-diameter pilot-operated solenoid valve according to claim 5, characterized in that, The outer wall of the diaphragm (19) is fixedly connected to a first connecting piece (20) and a second connecting piece (21). The outer wall of the first connecting piece (20) is fixedly connected to the inner wall of the connecting shell (2), and the outer wall of the second connecting piece (21) is fixedly connected to the outer wall of the guide block (11).

7. The piston-type large-diameter pilot-operated solenoid valve according to claim 6, characterized in that, The upper surface of the diaphragm (19) is fixedly connected to a second telescopic rod (22), the top end of the second telescopic rod (22) is fixedly connected to the inner wall of the connecting shell (2), and the outer wall of the second telescopic rod (22) is slidably connected to a third spring (23).

8. The piston-type large-diameter pilot-operated solenoid valve according to claim 7, characterized in that, One end of the third spring (23) is fixedly connected to the upper surface of the diaphragm (19), and the other end is fixedly connected to the inner wall of the connecting shell (2).

9. The piston-type large-diameter pilot-operated solenoid valve according to claim 5, characterized in that, The main valve body (1) has a first flow channel (25) inside, the guide block (11) has a second flow channel (26) inside, and a partition (24) is fixedly connected inside the main valve body (1).

10. The piston-type large-diameter pilot-operated solenoid valve according to claim 9, characterized in that, The partition (24) is located between the first flow channel opening (25) and the guide tube (18), and the second connecting piece (21) can be attached to the second flow channel opening (26) when the diaphragm (19) is raised.

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