Large-diameter pilot-operated type normally-closed electromagnetic valve

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to a large-diameter pilot-operated type normally-closed electromagnetic valve which comprises a valve element, an electromagnetic assembly and a mounting seat, the electromagnetic assembly is fixedly mounted on the mounting seat, a sliding hole is formed in the mounting seat, a valve rod is slidably connected into the sliding hole, and a pilot hole is formed in the mounting seat; the valve rod is designed to be provided with the plugging part and the sliding part, the plugging part and the sliding part are connected through the swing spring, when the valve is opened and the pressure of water flow acts on the swing part, the swing part can incline along with the water flow, the pressure of the water flow cannot act on the sliding part, and therefore friction between the valve rod and the sliding hole is reduced; and when the valve is closed, the swing rod in the straightening assembly can rotate along with movement of the sliding part, the swing rod exerts pressure on the plugging part to enable the axis of the plugging part to be consistent with that of the sliding part, and therefore it is ensured that the bottom face of the plugging part can be attached to the pilot hole, and the sealing effect of the plugging part on the pilot hole is improved.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, in particular to a large-caliber pilot-operated normally closed solenoid valve. Background Art

[0002] The large-diameter pilot-operated normally closed solenoid valve, when powered on, relies on electromagnetic force to lift the valve stem and the pilot valve port opens. At this time, the upper chamber of the solenoid valve releases pressure through the pilot hole, forming a pressure difference with lower top and higher bottom around the main valve core. Under the action of the pressure difference, the fluid pressure pushes the main valve core to move upward to open the main valve port. When the power is off, under the action of the spring force and the gravity of the main valve core, the valve stem is reset, the pilot hole is closed, the main valve core moves downward, the main valve port is closed, the pressure in the upper chamber of the solenoid valve increases, and the fluid pressure pressurizes the main valve core for better sealing.

[0003] When the large-diameter pilot-operated normally closed solenoid valve is opened, the fluid will flow from the upper chamber to the lower chamber. At this time, the lower end of the valve stem on the side of the inlet will be continuously impacted by the fluid, which will cause the upper end of the valve stem to exert pressure on the inner side of the pin hole. At this time, when the valve stem is controlled to open and close by electromagnetic force, there will be greater friction between the upper end of the valve stem and one side of the pin hole. During the frequent opening and closing of the large-diameter pilot-operated normally closed solenoid valve, the inner side of the pin hole will cause obvious wear due to long-term extrusion and friction, which will cause the valve stem to deviate, and then the lower end face of the valve stem cannot completely fit with the edge of the pilot valve port, and the fluid leaks from the gap between the lower end face of the valve stem and the pilot valve port.

[0004] In view of the above problems, the prior art provides some solutions, such as patent application number: CN201820917249.2, which provides a solenoid valve with a pilot valve core, including a moving iron, a fixed iron, a valve stem, a valve core and a pilot valve core, wherein the moving iron is placed on the left side of the cavity, the fixed iron is placed on the right side of the cavity, and a through hole is provided on the axis of the fixed iron, one end of the valve stem is fixed to the moving iron, and the other end can movably pass through the through hole, and the top of the valve stem is integrally formed with a connecting block, and the top of the connecting block is detachably connected with the above-mentioned pilot valve core. The solenoid valve with a pilot valve core is detachably connected with the pilot valve core at the top of the valve stem. After long-term use and wear and failure, the pilot valve core can be replaced separately without replacing the entire valve stem, saving costs and extending the service life of the solenoid valve. With the solenoid valve housing that is easy to disassemble, it provides convenience for the later replacement of the pilot valve core and other components. Although this design facilitates the replacement of the valve core, it does not solve the problem of leakage caused by wear of the valve core. Summary of the invention

[0005] The purpose of the present invention is to provide a large-caliber pilot-operated normally closed solenoid valve to solve the problem that the inner side of the pin hole will cause wear due to long-term extrusion and friction, causing the valve stem to deviate, and then causing the lower end face of the valve stem to be unable to completely fit with the edge of the pilot valve port, and the fluid leaks from the gap between the lower end face of the valve stem and the pilot valve port.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A large-caliber pilot-operated normally closed solenoid valve comprises a valve core, an electromagnetic assembly and a mounting seat, wherein the electromagnetic assembly is fixedly mounted on the mounting seat, a sliding hole is provided on the mounting seat, a valve stem is slidably connected inside the sliding hole, a compression spring 1 is arranged between the valve core and the inside of the mounting seat, a diaphragm is fixedly connected to the valve core, the diaphragm is also fixedly connected to the mounting seat, a compression spring 2 is arranged between the valve stem and the inner wall of the mounting seat, a pilot hole is provided on the mounting seat, the valve core comprises a sliding portion and a blocking portion, a swing spring is arranged between the sliding portion and the blocking portion, a swaying assembly with a swing rod is also arranged inside the mounting seat, the swing rod is hinged to the mounting seat, and the swaying assembly is used to push the swing rod to rotate toward the blocking portion when the sliding portion moves toward the pilot hole so that the blocking portion and the axis of the sliding portion are consistent.

[0008] It is easy to understand that when a large-diameter pilot-operated normally closed solenoid valve is opened, the lower end of the valve stem on the side of the inlet will be continuously impacted by the fluid, which will cause the upper end of the valve stem to exert pressure on the inner side of the sliding hole. The inner side of the sliding hole will cause obvious wear under long-term extrusion and friction, which will cause the valve stem to deviate, and then the lower end face of the valve stem cannot completely fit with the edge of the pilot valve port, which will cause the fluid to leak from the gap between the lower end face of the valve stem and the pilot valve port. This design is achieved by designing the valve stem into a sliding part and a sealing part, and the sliding part and the sealing part are connected by a swing spring, which makes the large-diameter normally closed solenoid valve open. When the large-diameter pilot-operated normally closed solenoid valve is opened, the pressure of the water flow acts on the swing part, and the swing part will tilt along with the water flow, which relieves the pressure on the sliding part, thereby reducing the friction between the valve stem and the sliding hole and improving the service life of the large-diameter pilot-operated normally closed solenoid valve. When the large-diameter pilot-operated normally closed solenoid valve is closed, the rocker arm in the swing assembly will rotate along with the movement of the sliding part, and the rocker arm will apply pressure to the blocking part to make the axis of the blocking part consistent with that of the sliding part, thereby ensuring that the bottom surface of the blocking part can fit with the outside of the pilot hole, thereby improving the sealing effect of the blocking part on the pilot hole.

[0009] Preferably, the alignment assembly includes an alignment block 1, which is fixedly connected to the mounting seat, a limit block is arranged on the blocking portion, a swing groove is also provided inside the mounting seat, the rocker arm extends to the outside of the swing groove, one end of the rocker arm is fixedly connected to an alignment block 2, an alignment groove 1 is provided on the alignment block 1, an alignment groove 2 is provided on the alignment block 2, a pressing rod is fixedly connected to the sliding portion, the pressing rod is located on a side of the rocker arm away from the sliding portion, when the sliding portion moves toward the pilot hole, the pressing rod contacts the rocker arm to cause the rocker arm to rotate, and at this time the limit block respectively fits with the inner walls of the alignment groove 1 and the alignment groove 2.

[0010] It is easy to understand that when the sliding part moves toward the pilot hole, the pressing rod moves with the sliding part. During the movement of the pressing rod, it will contact the side of the rocker arm away from the sliding part, and the pressing rod will apply pressure to the rocker arm to rotate the rocker arm. At this time, the straightening block 2 at one end of the rocker arm will contact the blocking part, and the straightening block will push the blocking part and wrap the blocking part between the straightening block 1 and the straightening block 2. At this time, the axis of the blocking part is consistent with the sliding part. The straightening component drives the rocker arm to rotate by utilizing the sliding of the sliding part caused by the electromagnetic force of the electromagnetic component. The sealing part can be adjusted without the need for an additional power device, which reduces the cost. In addition, when the large-diameter pilot-operated normally closed solenoid valve is opened, the rocker arm is rotated back in the direction away from the blocking part due to the pressure of the water flow, which avoids the collision and wear of the blocking part with the rocker arm when it swings, thereby also improving the service life of the valve stem.

[0011] Preferably, a sliding groove is provided on the straightening block, a slider is slidably connected to the sliding groove, a connecting block is fixedly connected to one end of the slider, a connecting hole is provided on the blocking portion, both sides of the connecting block are chamfered, the connecting block on the slider extends to the inside of the connecting hole on the blocking portion, a pressing block is fixedly connected to the other end of the slider, the pressing block is in contact with the sliding portion, and the edges around the connecting hole are chamfered.

[0012] It is easy to understand that when the large-diameter pilot-operated normally closed solenoid valve is closed, the sliding part applies pressure to the sealing part through the swing spring, so that the sealing part seals the pilot hole, and the swing spring cannot completely transmit the pressure applied by the sliding part to the sealing part, which causes the sealing part to be unable to seal the pilot hole more forcefully, and the swing spring will age under long-term pulling, further reducing the pressure on the sealing part. The design arranges a slider on the straightening block 1. When the sealing block is straightened by the straightening assembly, the connecting block on the slider will enter the connecting hole 1 on the sealing part. When the sliding part slides, it will push the pressing block at the other end of the slider. At this time, the sliding part can directly transmit the pressure to the sealing part through the slider, so that the sealing part can better fit with the outside of the pilot hole, thereby improving the sealing effect of the pilot hole of the large-diameter pilot-operated normally closed solenoid valve when it is closed.

[0013] Preferably, a movable groove is provided on the inner wall of the sliding hole, the pressing block is located inside the movable groove, and a second connecting hole is also provided on the sliding part. Both sides of the pressing block are chamfered. When the sliding part moves toward the pilot hole, the pressing block is squeezed into the second connecting hole, and the surface of the pressing block fits with the inner wall of the second connecting hole. When the sliding part moves in the direction away from the pilot hole, the pressing block is squeezed away from the second connecting hole.

[0014] It is easy to understand that when the large-diameter pilot-operated normally closed solenoid valve is opened, the electromagnetic assembly will attract the sliding part to move in the direction away from the pilot hole, and the sliding part will pull the blocking part through the swing spring and make the blocking part away from the pilot hole. In this process, since the swing spring is compressed when the valve is closed, the sliding part will first stretch the swing spring before pulling the blocking part when the valve is opened. This will cause the blocking part of the large-diameter pilot-operated normally closed solenoid valve to be unable to open the pilot hole immediately after receiving the valve opening command, thereby causing the large-diameter pilot-operated normally closed solenoid valve to respond more slowly when opening the valve. By opening the second connecting hole on the sliding part, when the valve is closed, the sliding part moves and applies pressure to the pressing block to make the slider elastically deform, thereby making the pressing block enter the second connecting hole. At this time, the sliding part and the blocking part are connected to each other through the slider. Therefore, when the valve is opened, the sliding part can directly pull the blocking part through the slider, and after the sliding part moves to a certain distance, the pressing block is squeezed away from the second connecting hole. Therefore, this design ensures the response speed of the large-diameter pilot-operated normally closed solenoid valve when opening the valve, and ensures that the blocking part of the large-diameter pilot-operated normally closed solenoid valve can open the pilot hole as soon as possible after receiving the valve opening command.

[0015] Preferably, the second straightening block and the rocker arm are both provided with a plurality of rectangular grooves, and the plurality of rectangular grooves are evenly distributed on the second straightening block and the rocker arm.

[0016] It is easy to understand that the design provides rectangular grooves on the straightening block 2 and the rocker rod. When the pressing rod follows the sliding part to squeeze the rocker rod, the pressure of the water flow on the straightening block 2 and the rocker rod can be reduced, the pressure of the swing component driving the rocker rod is reduced, and the influence of the straightening component on the normal sliding of the sliding part during operation is further reduced, thereby improving the reliability of the large-caliber pilot-operated normally closed solenoid valve. In addition, the rectangular grooves are provided on the straightening block 2 and the rocker rod, which can also reduce the weight of the straightening block 2 and the rocker rod, further reducing the pressure of the swing component driving the rocker rod and the influence of the straightening component on the normal sliding of the sliding part during operation.

[0017] Preferably, when the blocking portion contacts the inner wall of the mounting seat and the pressing block is located inside the second connecting hole, the distance between the bottom surface of the sliding portion and the exit of the sliding hole is A, and A≤0 mm.

[0018] It is easy to understand that this design makes it possible for the bottom surface of the sliding part to be flush with the sliding hole or the sliding part to be located inside the sliding hole when the large-diameter pilot-operated normally closed solenoid valve is closed. This makes it possible for the sliding part to not extend out of the sliding hole when the large-diameter pilot-operated normally closed solenoid valve is opened or closed, thereby preventing the water flow from impacting the side of the sliding part. Therefore, this design further reduces the impact of the water flow impact on the rotation of the valve stem, and further increases and reduces the power required for the rotation of the valve stem.

[0019] Preferably, there is a sliding gap between the inner wall of the first straightening groove and the limit block, and between the inner wall of the second straightening groove and the limit block, the sliding gap width is B, and B≤0.05mm, a limiting ring is arranged on the mounting seat, the limiting ring is arranged coaxially with the pilot hole, and the end of the sealing portion close to the pilot hole is chamfered.

[0020] It is easy to understand that when the straightening block 1 and the straightening block 2 straighten the blocking part, the blocking part will be subjected to the pressure of the straightening block 1 and the straightening block 2, thereby increasing the friction force on the blocking part when it moves toward the pilot hole. When the large-diameter pilot-operated normally closed solenoid valve needs to close the valve, the blocking part will move slowly due to the friction force, which will cause the response speed of the large-diameter pilot-operated normally closed solenoid valve to decrease when it needs to close the valve. Moreover, when the compression spring 2 used to push the sliding part ages and loses its elasticity after long-term use, this may cause the sliding part to be unable to push the blocking part to move, thereby causing the large-diameter pilot-operated normally closed solenoid valve to be unable to close the valve. The design limits the distance between the straightening block 1 and the straightening block 2 when they are closed. When the straightening block 1 and the straightening block 2 are closed, there will be a sliding gap with the blocking part. This makes it possible for the straightening block 1 and the straightening block 2 to not apply pressure to the blocking part when they straighten the blocking part, thereby avoiding the blocking part from getting stuck and unable to close when it moves.

[0021] Preferably, there is a swing gap between the pressing rod and the rocker arm, a torsion spring is provided at the hinge between the rocker arm and the mounting seat, a protrusion is fixedly connected to the rocker arm, and when the sliding part moves toward the pilot hole, the pressing rod contacts the protrusion, and when the sealing part contacts the mounting seat, the pressing rod moves away from the protrusion.

[0022] It is easy to understand that when the valve core of the large-diameter pilot-operated normally closed solenoid valve is completely closed, water hammer is likely to occur inside the pipeline, causing vibration. In addition, factors such as changes in water pressure inside the pipeline during daily use will also cause vibration. The vibration will cause the blocking part to collide with the straightening block 2, which in turn causes wear between the blocking part and the straightening block 2. The design sets a protrusion on the rocker arm. When the pressing rod follows the movement of the sliding part, it will contact the protrusion. At this time, the pressing rod will cause the rocker arm to swing toward the blocking part. When the blocking part contacts the pilot hole, the sliding part needs to continue to move. At this time, the pressing rod will move away from the protrusion. At this time, the rocker arm is no longer squeezed by the pressing rod and is moved away from the blocking part by the torsion spring. At this time, when the large-diameter pilot-operated normally closed solenoid valve vibrates, the blocking part will not collide with the straightening block 2. Therefore, the design avoids the collision and wear between the blocking part and the straightening block 2, thereby improving the service life of the large-diameter pilot-operated normally closed solenoid valve.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention designs the valve stem into a blocking part and a sliding part, and connects the blocking part and the sliding part to each other through a swing spring. When the valve is opened, when the pressure of the water flow acts on the swing part, the swing part will tilt along with the water flow, and the water flow pressure cannot act on the sliding part by itself, thereby reducing the friction between the valve stem and the sliding hole and improving the service life. When the valve is closed, the swing rod in the alignment assembly will rotate along with the movement of the sliding part, and the swing rod applies pressure to the blocking part to make the axes of the blocking part and the sliding part consistent, thereby ensuring that the bottom surface of the blocking part can fit with the pilot hole, thereby improving the sealing effect of the blocking part on the pilot hole.

[0025] 2. The present invention arranges a pressing rod inside the mounting seat so that the alignment assembly can drive the rocker arm to rotate by utilizing the sliding of the sliding part caused by the electromagnetic force of the electromagnetic assembly. The blocking part can be adjusted without the need for an additional power device, thereby reducing costs. In addition, when the large-caliber pilot-operated normally closed solenoid valve is opened, the rocker arm is rotated back in a direction away from the blocking part due to the pressure of the water flow, thereby avoiding wear and collision between the blocking part and the rocker arm when swinging, thereby increasing the service life of the valve stem.

[0026] 3. The present invention arranges a slider inside the mounting seat. When the blocking block is aligned by the alignment assembly, the connecting block on the slider will enter into the connecting hole 1 on the blocking part. When the sliding part slides, it will push the pressing block at the other end of the slider. At this time, the sliding part can directly transfer the pressure to the blocking part through the slider, so that the blocking part can better fit with the outer side of the pilot hole, thereby improving the sealing effect of the pilot hole of the large-caliber pilot-operated normally closed solenoid valve when it is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a large-caliber pilot-operated normally closed solenoid valve of the present invention;

[0028] Figure 2 for Figure 1 Sectional view at AA;

[0029] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0030] Figure 4 It is a cross-sectional view of a large-caliber pilot-operated normally closed solenoid valve with the valve core opened;

[0031] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0032] Figure 6 for Figure 1 Sectional view at DD in the middle;

[0033] Figure 7 for Figure 6 Enlarged view of point E in the middle;

[0034] Figure 8 It is a structural schematic diagram of the swing rod of the present invention.

[0035] In the figure: 1. electromagnetic assembly; 2. mounting seat; 3. valve core; 4. sliding hole; 5. valve stem; 6. compression spring 1; 7. diaphragm; 8. compression spring 2; 9. pilot hole; 10. sliding part; 11. sealing part; 12. swing spring; 13. rocker arm; 14. alignment block 1; 15. limit block; 16. swing groove; 17. alignment block 2; 18. alignment groove 1; 19. alignment groove 2; 20. pressing rod; 21. sliding groove; 22. slider; 23. connecting block; 24. connecting hole 1; 25. pressing block; 26. movable groove; 27. connecting hole 2; 28. rectangular groove; 29. ​​limit ring; 30. protrusion. DETAILED DESCRIPTION

[0036] The present invention provides a large-caliber pilot-operated normally closed solenoid valve, and the technical solution is as follows:

[0037] See also Figures 1 to 8 A large-caliber pilot-operated normally closed solenoid valve comprises a valve core 3, an electromagnetic assembly 1 and a mounting seat 2. The electromagnetic assembly 1 is fixedly mounted on the mounting seat 2. The electromagnetic assembly 1 is an electromagnet and a coil in the prior art. A sliding hole 4 is provided on the mounting seat 2. A valve stem 5 is slidably connected inside the sliding hole 4. A compression spring 6 is provided between the valve core 3 and the inside of the mounting seat 2. A diaphragm 7 is fixedly connected to the valve core 3. The diaphragm 7 is also fixedly connected to the mounting seat 2. A compression spring 8 is provided between the valve stem 5 and the inner wall of the mounting seat 2. A pilot hole 9 is provided on the mounting seat 2. The valve core 3 It includes a sliding part 10 and a blocking part 11, a swing spring 12 is arranged between the sliding part 10 and the blocking part 11, and a swaying assembly with a swing rod 13 is also arranged inside the mounting seat 2. The swing rod 13 is hinged to the mounting seat 2, and the swaying assembly is used to push the swing rod 13 to rotate toward the blocking part 11 when the sliding part 10 moves toward the pilot hole 9 so that the axis of the blocking part 11 is consistent with that of the sliding part 10. When the blocking part 11 contacts the inner wall of the mounting seat 2 and the pressing block 25 is located inside the second connecting hole 27, the distance between the bottom surface of the sliding part 10 and the exit of the sliding hole 4 is A, A=0mm.

[0038] For further information, see Figures 1 to 8The alignment assembly includes an alignment block 14, which is fixedly connected to the mounting seat 2, a limit block 15 is arranged on the blocking portion 11, a swing groove 16 is also provided inside the mounting seat 2, the swing rod 13 extends to the outside of the swing groove 16, one end of the swing rod 13 is fixedly connected to an alignment block 2 17, an alignment groove 18 is provided on the alignment block 14, an alignment groove 2 19 is provided on the alignment block 2 17, and a pressing rod 20 is fixedly connected to the sliding portion 10, and the pressing rod 20 is located on the side of the swing rod 13 away from the sliding portion 10. When the sliding portion 10 moves toward the pilot hole 9, the pressing rod 20 contacts the swing rod 13 to make the swing The rod 13 rotates, and at this time, the limit block 15 is respectively fitted with the inner walls of the alignment groove 18 and the alignment groove 2 19, a sliding groove 21 is provided on the alignment block 14, and a slider 22 is slidably connected to the sliding groove 21, and a connecting block 23 is fixedly connected to one end of the slider 22, and a connecting hole 24 is provided on the blocking portion 11, and both sides of the connecting block 23 are chamfered. The connecting block 23 on the slider 22 extends to the inside of the connecting hole 24 on the blocking portion 11, and a pressing block 25 is fixedly connected on the other end of the slider 22, and the pressing block 25 contacts the sliding portion 10, and the edges around the connecting hole 24 are chamfered.

[0039] See also Figures 1 to 8 , a movable groove 26 is provided on the inner wall of the sliding hole 4, and the pressing block 25 is located inside the movable groove 26. A second connecting hole 27 is also provided on the sliding part 10, and both sides of the pressing block 25 are chamfered. When the sliding part 10 moves toward the pilot hole 9, the pressing block 25 is squeezed into the second connecting hole 27, and the surface of the pressing block 25 fits with the inner wall of the second connecting hole 27. When the sliding part 10 moves in the direction away from the pilot hole 9, the pressing block 25 is squeezed away from the second connecting hole 27. Eight rectangular grooves 28 are provided on the second aligning block 17 and the rocker 13. The eight rectangular grooves 28 are evenly distributed on the second aligning block 17 and the rocker 13. There is a sliding gap between the inner wall of the positive groove 18 and the limit block 15, and between the inner wall of the aligning groove 2 19 and the limit block 15, and the sliding gap width is B = 0.05mm. A limit ring 29 is arranged on the mounting seat 2, and the limit ring 29 is arranged coaxially with the pilot hole 9. The end of the blocking portion 11 close to the pilot hole 9 is chamfered, and there is a swinging gap between the pressing rod 20 and the rocker arm 13. A torsion spring is arranged at the hinge between the rocker arm 13 and the mounting seat 2, and a protrusion 30 is fixedly connected to the rocker arm 13. When the sliding portion 10 moves toward the pilot hole 9, the pressing rod 20 contacts with the protrusion 30, and when the blocking portion 11 contacts the mounting seat 2, the pressing rod 20 moves away from the protrusion 30.

[0040] See also Figures 1 to 8When the electromagnetic assembly 1 in the large-caliber pilot-operated normally closed electromagnetic valve is started, the electromagnet inside the electromagnetic assembly 1 attracts the sliding part 10, and the sliding part 10 is compressed by the suction force and compresses the compression spring 28 and slides in the sliding hole 4. During the movement of the sliding part 10, the inner wall of the connecting hole 27 on the sliding part 10 will apply pressure to the pressing block 25. At this time, the slider 22 will follow the sliding part 10 to move in the sliding groove 21. When the slider 22 moves, the connecting block 23 at one end of the slider 22 will apply pressure to the connecting hole 1 24 on the blocking part 11. At this time, the blocking part 11 will move together with the slider 22 and move away from the pilot hole 9. When the slider 22 contacts When the slider 22 is inside the sliding groove 21, it is restricted and cannot move further. At this time, the sliding part 10 continues to move, and the inner wall of the connecting hole 27 will apply pressure to the pressing block 25 and squeeze the slider 22 to make the slider 22 elastically deform in the direction away from the sliding part 10. The pressing block 25 leaves the connecting hole 27. At this time, the sliding part 10 stops moving and the pressing rod 20 follows the sliding movement to the top of the protrusion 30. After the pilot hole 9 is opened, the liquid will flow out through the pilot hole 9. At this time, the maximum pressure below the valve core 3 is greater than the pressure above, and the valve core 3 is pushed. At this time, the liquid starts to flow, and the pressure of the liquid pushes the blocking part 11, and the blocking part 11 pulls the spring and swings.

[0041] See also Figures 1 to 8When the electromagnetic assembly 1 in the large-caliber pilot-operated normally closed electromagnetic valve is closed, the electromagnet inside the electromagnetic assembly 1 no longer attracts the sliding part 10. The sliding part 10 slides in the sliding hole 4 under the thrust of the compression spring 28, and the pressing rod 20 moves with the sliding part 10. When the pressing rod 20 contacts the protrusion 30 on the rocker 13, the pressing block 25 applies pressure to the protrusion 30 and pushes the rocker 13 to rotate. At this time, the straightening block 217 at one end of the rocker 13 moves with the rocker 13. After the rocker 13 moves a certain distance, the inner wall of the straightening groove 219 on the straightening block 217 contacts the limit block 15 on the blocking part 11. At this time, the straightening block 217 pushes the blocking part 11, and the rocker 13 continues to rotate. When the straightening block 217 contacts the straightening block 14, the blocking part 11 comes into the straightening groove 18 and is moved by the straightening block 11 4 and the straightening block 17 are wrapped inside, and the connecting block 23 on the slider 22 enters into the connecting hole 1 24. At this time, the sliding part 10 continues to move. When the bottom surface of the sliding part 10 contacts the pressing block 25, the sliding part 10 will push the slider 22 to move, and then the slider 22 pushes the blocking part 11 to move toward the pilot hole 9. When the blocking part 11 contacts the limit ring 29 and fits with the pilot hole 9, the sliding part 10 continues to move. At this time, the bottom surface of the sliding part 10 will apply pressure to the pressing block 25 and cause the slider 22 to undergo elastic deformation. At this time, the pressing block 25 will enter the inside of the connecting hole 27. At this time, the pressing rod 20 is away from the protrusion 30, and the rocker arm 13 is away from the blocking part 11 by the action of the torsion spring. At this time, the liquid cannot flow into the pilot hole 9, and the valve core 3 is pushed downward by the compression spring 1 6. At this time, the large-caliber pilot normally closed solenoid valve is closed.

[0042] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A large-caliber pilot-operated normally closed solenoid valve, comprising a valve core (3), an electromagnetic assembly (1) and a mounting seat (2), wherein the electromagnetic assembly (1) is fixedly mounted on the mounting seat (2), a sliding hole (4) is provided on the mounting seat (2), a valve stem (5) is slidably connected inside the sliding hole (4), a compression spring (6) is provided between the valve core (3) and the inside of the mounting seat (2), a diaphragm (7) is fixedly connected to the valve core (3), and the diaphragm (7) is also fixedly connected to the mounting seat (2), a compression spring (8) is provided between the valve stem (5) and the inner wall of the mounting seat (2), and a pilot hole (9) is provided on the mounting seat (2), characterized in that: The valve core (3) comprises a sliding portion (10) and a blocking portion (11), a swing spring (12) is arranged between the sliding portion (10) and the blocking portion (11), and a swaying assembly having a sway rod (13) is also arranged inside the mounting seat (2), the sway rod (13) is hinged to the mounting seat (2), and the swaying assembly is used for rotating the sway rod (13) toward the blocking portion (11) when the sliding portion (10) moves toward the pilot hole (9), so that the axes of the blocking portion (11) and the sliding portion (10) are consistent.

2. A large-caliber pilot-operated normally closed solenoid valve according to claim 1, characterized in that: The alignment assembly comprises an alignment block (14), the alignment block (14) being fixedly connected to the mounting seat (2), a limit block (15) being arranged on the blocking portion (11), a swing groove (16) being arranged inside the mounting seat (2), the swing rod (13) extending to the outside of the swing groove (16), one end of the swing rod (13) being fixedly connected to an alignment block (17), the alignment block (14) being provided with an alignment groove (18), the alignment The second block (17) is provided with a second aligning groove (19). The sliding portion (10) is fixedly connected with a pressing rod (20). The pressing rod (20) is located on a side of the rocker arm (13) away from the sliding portion (10). When the sliding portion (10) moves toward the pilot hole (9), the pressing rod (20) contacts the rocker arm (13) to rotate the rocker arm (13). At this time, the limit block (15) is respectively in contact with the inner walls of the first aligning groove (18) and the second aligning groove (19).

3. A large-caliber pilot-operated normally closed solenoid valve according to claim 2, characterized in that: The aligning block (14) is provided with a sliding groove (21), a slider (22) is slidably connected to the sliding groove (21), one end of the slider (22) is fixedly connected to a connecting block (23), the blocking portion (11) is provided with a connecting hole (24), both sides of the connecting block (23) are chamfered, the connecting block (23) on the slider (22) extends into the inside of the connecting hole (24) on the blocking portion (11), the other end of the slider (22) is fixedly connected to a pressing block (25), the pressing block (25) is in contact with the sliding portion (10), and the edges of the connecting hole (24) are chamfered.

4. A large-caliber pilot-operated normally closed solenoid valve according to claim 3, characterized in that: The inner wall of the sliding hole (4) is provided with a movable groove (26), the pressing block (25) is located inside the movable groove (26), the sliding portion (10) is further provided with a second connecting hole (27), both sides of the pressing block (25) are chamfered, when the sliding portion (10) moves toward the pilot hole (9), the pressing block (25) is squeezed into the second connecting hole (27), and the surface of the pressing block (25) is in contact with the inner wall of the second connecting hole (27), when the sliding portion (10) moves in a direction away from the pilot hole (9), the pressing block (25) is squeezed away from the second connecting hole (27).

5. A large-caliber pilot-operated normally closed solenoid valve according to claim 2, characterized in that: The second aligning block (17) and the swing rod (13) are both provided with a plurality of rectangular grooves (28), and the plurality of rectangular grooves (28) are evenly distributed on the second aligning block (17) and the swing rod (13).

6. A large-caliber pilot-operated normally closed solenoid valve according to claim 1, characterized in that: When the blocking portion (11) contacts the inner wall of the mounting seat (2) and the pressing block (25) is located inside the second connecting hole (27), the distance between the bottom surface of the sliding portion (10) and the exit of the sliding hole (4) is A, and A≤0 mm.

7. A large-caliber pilot-operated normally closed solenoid valve according to claim 4, characterized in that: There is a sliding gap between the inner wall of the first alignment groove (18) and the limit block (15), and between the inner wall of the second alignment groove (19) and the limit block (15), the sliding gap width is B, and B is less than or equal to 0.05 mm. A limit ring (29) is provided on the mounting seat (2), and the limit ring (29) is coaxially arranged with the pilot hole (9). The end of the blocking portion (11) close to the pilot hole (9) is chamfered.

8. A large-caliber pilot-operated normally closed solenoid valve according to claim 7, characterized in that: There is a swing gap between the pressing rod (20) and the swing rod (13), a torsion spring is provided at the hinge between the swing rod (13) and the mounting seat (2), a protrusion (30) is fixedly connected to the swing rod (13), and when the sliding part (10) moves toward the pilot hole (9), the pressing rod (20) contacts the protrusion (30), and when the blocking part (11) contacts the mounting seat (2), the pressing rod (20) moves away from the protrusion (30).

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