Normally open medium pressure solenoid valve

Abstract

The utility model provides a normally open medium pressure solenoid valve, including main valve subassembly and electromagnetic subassembly, the front end of main valve subassembly is opened with main inflow channel, the rear end of main valve subassembly is opened with main outflow channel, the inside of main valve subassembly is opened with control chamber, be provided with sealing spring and sealing piston in control chamber, be opened with pilot channel on sealing piston, the upper end of main valve subassembly is opened with installation groove, the inside of main valve subassembly is provided with vice inflow channel, the inside of main valve subassembly is opened with vice outflow channel, electromagnetic subassembly includes magnetic isolation pipe, movable core, return spring and electromagnetic coil, the inside of main valve subassembly is provided with detection chamber, be provided with microswitch in detection chamber, the lower end of sealing piston is connected with trigger rod, trigger rod passes through main outflow channel and extends into detection chamber. Setting microswitch and signal transmitter in detection chamber are used for monitoring the opening and closing state of solenoid valve, avoid causing safety accident because of misoperation.

Description

Technical Field

[0001] This utility model relates to solenoid valves, and more particularly to a normally open medium-pressure solenoid valve. Background Technology

[0002] Currently, Chinese patent CN114458769A discloses a fast-response pilot-operated solenoid valve structure, including an electromagnet assembly, a spring assembly, a pilot valve assembly, and a main valve assembly.

[0003] The electromagnet assembly consists of a magnetic shielding sleeve, a coil, a clamping nut, a clamping cap, and a nozzle body connection. The bottom of the clamping cap is a conical surface or a flat surface.

[0004] The pilot valve assembly includes an armature, a pilot valve core, and a pilot seal. The pilot seal is nested at the lower end of the pilot valve core, which is located in the inner hole of the armature. The armature can drive the pilot valve core and the pilot seal to move up and down.

[0005] The spring assembly includes a spring seat, a pilot spring, a return spring, a washer, and a limiting block. The spring seat is connected to the lower end of the cap in the electromagnet assembly. The limiting block is installed in the nozzle body hole of the electromagnet assembly and is axially limited by the washer. The two ends of the pilot spring are connected to the spring seat and the pilot valve core in the pilot valve assembly, respectively. The two ends of the return spring are connected to the washer and the armature in the pilot valve assembly, respectively. The pilot valve assembly can move up and down in the spring assembly.

[0006] The main valve assembly includes a main valve core, a main valve sealing ring, and a main valve seat. The main valve sealing ring is located in the sealing ring groove on the main valve core. The main valve seat has an inlet channel. The main valve core has a pressure relief channel and a pilot channel parallel to the axis. The main valve core can move up and down between the main valve seat and the gasket in the above-mentioned spring assembly.

[0007] The cavity formed by the cap and the magnetic sleeve in the pilot valve assembly and the electromagnet assembly is the upper cavity of the spring. The cavity formed between the main valve assembly and the pilot valve assembly is the control cavity. The pilot channel connects the inlet channel and the control cavity.

[0008] After being powered on, the electromagnet assembly generates attraction, and the pilot valve assembly moves upward against the spring force of the pilot spring. The sealing surface A27 separates, allowing the control chamber and the back pressure chamber to connect through the pressure relief channel. The pressure in the control chamber is reduced through the pressure relief channel, causing the main valve core to move upward after a pressure difference is generated between the inlet channel and the control chamber. The sealing end face B1 separates from the sealing end face B2, allowing the medium in the inlet channel to flow out into the back pressure chamber.

[0009] However, the aforementioned pilot-operated solenoid valve does not have a detection structure installed. Therefore, if the operator performs subsequent operations when the pilot-operated solenoid valve fails to open or close normally, a major safety accident may easily occur. Utility Model Content

[0010] In view of this, the purpose of this utility model is to provide a normally open medium-pressure solenoid valve, which is equipped with a detection mechanism to monitor the opening and closing status and avoid safety accidents caused by misoperation.

[0011] To solve the above-mentioned technical problems, the technical solution of this utility model is: a normally open medium-pressure solenoid valve, including a main valve assembly and a solenoid assembly;

[0012] The main valve assembly has a main inlet channel at its front end and a main outlet channel at its rear end. A control chamber is located inside the main valve assembly, connecting the main inlet channel and the main outlet channel. A sealing spring and a sealing piston are installed in the control chamber. The sealing spring forces the sealing piston to seal the front end of the main outlet channel. A pilot channel is provided on the sealing piston to connect the upper and lower ends of the control chamber, which is separated by the sealing piston.

[0013] The main valve assembly has an installation groove at its upper end, and a secondary inflow channel is provided inside the main valve assembly. The secondary inflow channel connects the upper end of the control chamber and the installation groove. The main valve assembly also has a secondary outflow channel inside the main valve assembly. The secondary outflow channel connects the installation groove and the main outflow channel.

[0014] The electromagnetic assembly includes a magnetic shielding tube, a movable iron core, a return spring, and an electromagnetic coil. The lower end of the magnetic shielding tube is disposed in the mounting groove. The movable iron core is slidably disposed in the magnetic shielding tube. The return spring is connected to the main valve assembly and the movable iron core to drive the movable iron core upward and away from the secondary outflow channel. The electromagnetic coil is disposed outside the magnetic shielding tube. When the electromagnetic coil is energized, it will drive the movable iron core downward and seal the secondary outflow channel.

[0015] The main valve assembly has a detection chamber inside, in which a micro switch is installed. The lower end of the sealing piston is connected to a trigger rod, which passes through the main outlet channel and extends into the detection chamber. When the sealing piston seals the front end of the main outlet channel, the trigger rod presses the moving contact of the micro switch. When the sealing piston moves upward and releases the seal on the front end of the main outlet channel, the trigger rod separates from the moving contact of the micro switch. A signal transmitter is installed in the detection chamber and is electrically connected to the micro switch.

[0016] With the above technical solution, when the electromagnetic coil is energized, it drives the movable iron core downwards via magnetic force, sealing the front end of the secondary outlet channel. Simultaneously, the medium in the main inlet channel enters the lower end of the control chamber under pressure and then enters the upper end of the control chamber via the pilot channel, applying downward pressure to the sealing piston to balance the upward pressure from the medium in the lower end of the control chamber. The sealing piston then moves downwards under the force of the sealing spring, sealing the front end of the main outlet channel. At the same time, the lower end of the trigger rod presses the moving contact of the microswitch, which sends a signal through a signal transmitter to indicate that the solenoid valve is closed. When the electromagnetic coil is de-energized, the return spring drives the movable iron core upwards, releasing the seal on the front end of the secondary outlet channel and allowing the secondary outlet channel to connect with the mounting groove. Simultaneously, the medium at the upper end of the control chamber flows through the secondary inflow channel, the mounting groove, and the secondary outflow channel, and finally exits through the main outflow channel. This creates a pressure difference at the lower end of the control chamber, causing the sealing piston to move upwards and release the seal on the front end of the main outflow channel. Afterwards, the medium in the main inflow channel enters the main outflow channel through the control chamber. At the same time, the sealing piston moves the trigger rod upwards, causing the lower end of the trigger rod to separate from the moving contact of the microswitch. The microswitch then sends a signal through the signal transmitter to indicate that the solenoid valve is in the open state. The microswitch and signal transmitter are installed in the detection chamber to monitor the opening and closing status of the solenoid valve, preventing safety accidents caused by misoperation.

[0017] Preferably, the upper end of the magnetic shielding tube is provided with a positioning screw sleeve, the internal thread of the positioning screw sleeve is connected to a manual control rod, the lower end of the manual control rod extends into the magnetic shielding tube and abuts against the movable iron core, and the upper end of the manual control rod protrudes from the positioning screw sleeve and is provided with an adjustment handle.

[0018] With the above technical solution, if the electromagnetic coil malfunctions and fails to drive the movable iron core downward, the operator can adjust the handle to drive the manual control lever to rotate clockwise. Since the manual control lever is threadedly connected to the positioning screw sleeve, while the manual control lever rotates circumferentially, it will move axially downward and press down on the movable iron core to seal the front end of the secondary outflow channel.

[0019] Preferably, a positioning ring groove is provided circumferentially on the outer side wall of the manual control lever, and a set screw is threadedly connected to the outer side wall of the positioning screw sleeve. The threaded section of the set screw extends into the positioning ring groove. When the manual control lever rotates circumferentially, the threaded section of the set screw moves axially in the positioning ring groove.

[0020] The above technical solution uses the positioning ring groove and the set screw to limit the axial movement of the manual control lever.

[0021] Preferably, a mounting ring groove is provided circumferentially on the outer side wall of the manual control lever, and a sealing ring is nested in the mounting ring groove, with the outer ring of the sealing ring abutting against the inner side wall of the magnetic shielding tube.

[0022] Through the above technical solution, the sealing ring can seal the gap between the manual control lever and the magnetic shielding tube, thereby improving the sealing performance of the solenoid valve.

[0023] Preferably, the main valve assembly includes a valve body, a valve cover detachably disposed on the upper end of the valve body, and a valve seat detachably disposed on the lower end of the valve body. The control chamber is formed by the valve body and the valve cover, and the detection chamber is formed by the valve body and the valve seat.

[0024] Through the above technical solution, the main valve assembly consists of a detachably connected valve body, valve cover, and valve seat, which makes the processing of the control chamber and the detection chamber more convenient and the assembly of accessories more convenient.

[0025] Preferably, the upper end of the control chamber is provided with an upper receiving groove, the upper end of the sealing piston is provided with a lower receiving groove, and the two ends of the sealing spring are respectively received in the upper receiving groove and the lower receiving groove.

[0026] Through the above technical solution, the upper and lower storage slots can be used to limit the upper and lower ends of the sealing spring respectively, making the sealing spring less prone to displacement.

[0027] Preferably, the sealing piston includes a piston body and a piston head. An assembly ring groove is formed on the outer side wall of the piston body, and a sealing ring is provided in the assembly ring groove. The outer ring of the sealing ring abuts against the inner side wall of the control chamber. An assembly groove is formed at the lower end of the piston body, and a sealing block for sealing the front end of the main outlet channel is provided in the assembly groove. The lower end of the piston head abuts against the sealing block to press the sealing block into the assembly groove. The upper end of the piston head passes through the sealing block and the piston body and extends into the lower receiving groove. A nut is threadedly connected to the upper end of the piston head, and the nut abuts against the bottom of the lower receiving groove. The trigger rod is located at the lower end of the piston head.

[0028] Through the above technical solution, the sealing ring can seal the gap between the piston body and the inner wall of the control chamber, thereby improving the sealing performance of the solenoid valve. The sealing block is pressed and fixed in the assembly groove by the piston head, which has the advantage of convenient assembly and disassembly.

[0029] Preferably, the main valve assembly has a connecting through hole connecting the main outlet channel and the detection chamber. The trigger rod passes through the connecting through hole. A sealing ring groove is formed on the outer side wall of the trigger rod. A rubber ring is nested in the sealing ring groove. The outer ring of the rubber ring abuts against the inner side wall of the sealing ring groove.

[0030] Through the above technical solution, the rubber ring can seal the gap between the trigger rod and the inner wall of the connecting through hole, thereby improving the sealing performance of the solenoid valve.

[0031] Preferably, the movable iron core includes a fixed iron core, a movable valve core, a sealing block, and a valve core spring. A limiting groove is formed at the lower end of the fixed iron core body. A sliding groove is formed on the upper inner wall of the limiting groove, and the width of the limiting groove is greater than the width of the sliding groove. The upper end of the movable valve core is slidably disposed in the sliding groove. An outwardly flange is formed on the lower outer wall of the movable valve core, and the outwardly flange is movably disposed in the limiting groove. The reset spring is connected to the main valve assembly and the outwardly flange. A retaining groove is formed at the lower end of the movable valve core, and the sealing block is retained in the retaining groove. A receiving groove is formed on the upper inner wall of the retaining groove, and the width of the retaining groove is greater than the width of the receiving groove. The valve core spring is disposed in the receiving groove and connected to the movable valve core and the sealing block.

[0032] Through the above technical solution, the outward-flared edge not only cooperates with the limiting groove to restrict the sliding stroke of the movable valve core, but also provides a force application point for the return spring. The sealing block is stuck in the slot, making disassembly and assembly more convenient. The valve core spring applies a downward elastic force to the sealing block to ensure that the sealing block can effectively seal the front end of the secondary outflow channel. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0034] Figure 2 Cross-sectional view of the embodiment Figure 1 ;

[0035] Figure 3 for Figure 2 Enlarged view of part A;

[0036] Figure 4 Cross-sectional view of the embodiment Figure 2 ;

[0037] Figure 5 for Figure 4 Enlarged view of part B.

[0038] Reference numerals: 1. Main inlet channel; 2. Main outlet channel; 3. Control chamber; 4. Main valve assembly; 41. Valve body; 42. Valve cover; 43. Valve seat; 5. Electromagnetic assembly; 51. Magnetic shielding tube; 52. Movable iron core; 521. Fixed iron core; 522. Movable valve core; 523. Sealing block; 524. Valve core spring; 53. Return spring; 54. Electromagnetic coil; 6. Sealing spring; 7. Sealing piston; 71. Piston body; 72. Piston head; 8. Pilot channel; 9. Mounting groove; 10. Secondary inlet channel; 11. Secondary outlet channel; 12. Detection chamber 13. Microswitch; 14. Trigger rod; 15. Signal transmitter; 16. Positioning screw sleeve; 17. Manual control rod; 18. Adjusting handle; 19. Positioning ring groove; 20. Set screw; 21. Mounting ring groove; 22. Sealing ring; 23. Upper storage groove; 24. Lower storage groove; 25. Assembly ring groove; 26. Sealing ring; 27. Assembly groove; 28. Sealing block; 29. ​​Nut; 30. Connecting through hole; 31. Sealing ring groove; 32. Rubber ring; 33. Limiting groove; 34. Sliding groove; 35. Outer flange; 36. Slot; 37. Receiving groove. Detailed Implementation

[0039] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0040] A normally open medium-pressure solenoid valve, such as Figures 1 to 5 As shown, it includes a main valve assembly 4 and an electromagnetic assembly 5 disposed on the upper end of the main valve assembly 4. In use, the opening and closing state of the main valve assembly 4 can be changed through the electromagnetic assembly 5.

[0041] The main valve assembly 4 has a main flow inlet channel 1 at its front end and a main flow outlet channel 2 at its rear end. A control chamber 3 is located inside the main valve assembly 4, connecting the main flow inlet channel 1 and the main flow outlet channel 2. A sealing spring 6 and a sealing piston 7 are installed in the control chamber 3. The sealing spring 6 uses its elasticity to drive the sealing piston 7 to seal the front end of the main flow outlet channel 2. A pilot channel 8 is provided on the sealing piston 7, connecting the upper and lower ends of the control chamber 3, which is separated by the sealing piston 7.

[0042] The upper end of the main valve assembly 4 is provided with a mounting groove 9, and the lower end of the solenoid assembly 5 is disposed in the mounting groove 9. The main valve assembly 4 is provided with a secondary inflow channel 10, which connects the upper end of the control chamber 3 and the mounting groove 9. The main valve assembly 4 is also provided with a secondary outflow channel 11, which connects the mounting groove 9 and the main outflow channel 2.

[0043] The electromagnetic assembly 5 includes a magnetic shielding tube 51, a movable iron core 52, a return spring 53, and an electromagnetic coil 54. The lower end of the magnetic shielding tube 51 is disposed in the mounting groove 9. The movable iron core 52 is slidably disposed in the magnetic shielding tube 51. The return spring 53 is connected to the main valve assembly 4 and the movable iron core 52 to drive the movable iron core 52 to move upward and away from the secondary outlet channel 11. The electromagnetic coil 54 is disposed outside the magnetic shielding tube 51. When the electromagnetic coil 54 is energized, the electromagnetic coil 54 will drive the movable iron core 52 to move downward and seal the secondary outlet channel 11.

[0044] The main valve assembly 4 has a detection chamber 12 inside, in which a micro switch 13 is installed. A trigger rod 14 is connected to the lower end of the sealing piston 7, passing through the main outlet channel 2 and extending into the detection chamber 12. When the sealing piston 7 seals the front end of the main outlet channel 2, the trigger rod 14 presses the moving contact of the micro switch 13. When the sealing piston 7 moves upward and releases the seal on the front end of the main outlet channel 2, the trigger rod 14 separates from the moving contact of the micro switch 13. A signal transmitter 15 is installed in the detection chamber 12 and is electrically connected to the micro switch 13.

[0045] A positioning screw sleeve 16 is provided at the upper end of the magnetic shielding tube 51. A manual control lever 17 is connected to the internal thread of the positioning screw sleeve 16. The lower end of the manual control lever 17 extends into the magnetic shielding tube 51 and abuts against the movable iron core 52. The upper end of the manual control lever 17 protrudes from the positioning screw sleeve 16 and is provided with an adjusting handle 18. A positioning ring groove 19 is formed circumferentially on the outer wall of the manual control lever 17. A set screw 20 is threadedly connected to the outer wall of the positioning screw sleeve 16. The threaded section of the set screw 20 extends into the positioning ring groove 19. When the manual control lever 17 rotates circumferentially, the threaded section of the set screw 20 moves axially in the positioning ring groove 19. An installation ring groove 21 is formed circumferentially on the outer wall of the manual control lever 17. A sealing ring 22 is nested in the installation ring groove 21. The outer ring of the sealing ring 22 abuts against the inner wall of the magnetic shielding tube 51.

[0046] The main valve assembly 4 includes a valve body 41, a valve cover 42 detachably disposed on the upper end of the valve body 41, and a valve seat 43 detachably disposed on the lower end of the valve body 41. The control chamber 3 is formed by the valve body 41 and the valve cover 42, and the detection chamber 12 is formed by the valve body 41 and the valve seat 43.

[0047] The upper end of the control chamber 3 is provided with an upper storage groove 23, the upper end of the sealing piston 7 is provided with a lower storage groove 24, and the two ends of the sealing spring 6 are respectively stored in the upper storage groove 23 and the lower storage groove 24.

[0048] The sealing piston 7 includes a piston body 71 and a piston head 72. An assembly ring groove 25 is provided on the outer side wall of the piston body 71. A sealing ring 26 is provided in the assembly ring groove 25. The outer ring of the sealing ring 26 abuts against the inner side wall of the control chamber 3. An assembly groove 27 is provided at the lower end of the piston body 71. A sealing block 28 is provided in the assembly groove 27 to seal the front end of the main outlet channel 2. The lower end of the piston head 72 abuts against the sealing block 28 to press the sealing block 28 into the assembly groove 27. The upper end of the piston head 72 passes through the sealing block 28 and the piston body 71 and extends into the lower receiving groove 24. A nut 29 is threadedly connected to the upper end of the piston head 72. The nut 29 abuts against the bottom of the lower receiving groove 24. A trigger rod 14 is provided at the lower end of the piston head 72.

[0049] The main valve assembly 4 has a connecting through hole 30 that connects the main outlet channel 2 and the detection chamber 12. The trigger rod 14 passes through the connecting through hole 30. A sealing ring groove 31 is provided on the outer side wall of the trigger rod 14. A rubber ring 32 is nested in the sealing ring groove 31. The outer ring of the rubber ring 32 abuts against the inner side wall of the sealing ring groove 31.

[0050] The movable iron core 52 includes a fixed iron core 521, a movable valve core 522, a sealing block 523, and a valve core spring 524. A limiting groove 33 is formed at the lower end of the fixed iron core 521 body. A sliding groove 34 is formed on the inner side wall of the upper end of the limiting groove 33, and the width of the limiting groove 33 is greater than the width of the sliding groove 34. The upper end of the movable valve core 522 is slidably disposed in the sliding groove 34, and an outwardly flange 35 is formed on the outer side wall of the lower end of the movable valve core 522. The outer flange 35 is movably set in the limiting groove 33. The reset spring 53 is connected to the main valve assembly 4 and the outer flange 35. The lower end of the movable valve core 522 is provided with a slot 36. The sealing block 523 is stuck in the slot 36. The upper inner side wall of the slot 36 is provided with a receiving groove 37. The groove width of the slot 36 is greater than the groove width of the receiving groove 37. The valve core spring 524 is set in the receiving groove 37 and is connected to the movable valve core 522 and the sealing block 523.

[0051] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A normally open medium pressure solenoid valve characterized by: Includes the main valve assembly (4) and the solenoid assembly (5); The main valve assembly (4) has a main inlet channel (1) at its front end and a main outlet channel (2) at its rear end. The main valve assembly (4) has a control chamber (3) inside. The control chamber (3) connects the main inlet channel (1) and the main outlet channel (2). The control chamber (3) is provided with a sealing spring (6) and a sealing piston (7). The sealing spring (6) drives the sealing piston (7) to seal the front end of the main outlet channel (2) through its elastic force. The sealing piston (7) has a pilot channel (8) on it. The pilot channel (8) is used to connect the upper and lower ends of the control chamber (3) that is separated by the sealing piston (7). The main valve assembly (4) has an installation groove (9) at its upper end. The main valve assembly (4) has a secondary inflow channel (10) inside. The secondary inflow channel (10) connects the upper end of the control chamber (3) and the installation groove (9). The main valve assembly (4) has a secondary outflow channel (11) inside. The secondary outflow channel (11) connects the installation groove (9) and the main outflow channel (2). The electromagnetic assembly (5) includes a magnetic shielding tube (51), a movable iron core (52), a return spring (53), and an electromagnetic coil (54). The lower end of the magnetic shielding tube (51) is disposed in the mounting groove (9). The movable iron core (52) is slidably disposed in the magnetic shielding tube (51). The return spring (53) is connected to the main valve assembly (4) and the movable iron core (52) to drive the movable iron core (52) to move upward and away from the secondary outflow channel (11). The electromagnetic coil (54) is disposed outside the magnetic shielding tube (51). When the electromagnetic coil (54) is energized, the electromagnetic coil (54) will drive the movable iron core (52) to move downward and seal the secondary outflow channel (11). The main valve assembly (4) is provided with a detection chamber (12), in which a micro switch (13) is provided. The lower end of the sealing piston (7) is connected to a trigger rod (14). The trigger rod (14) passes through the main outlet channel (2) and extends into the detection chamber (12). When the sealing piston (7) seals the front end of the main outlet channel (2), the trigger rod (14) presses the moving contact of the micro switch (13). When the sealing piston (7) moves up and releases the seal on the front end of the main outlet channel (2), the trigger rod (14) separates from the moving contact of the micro switch (13). The detection chamber (12) is provided with a signal transmitter (15), which is electrically connected to the micro switch (13).

2. The normally open medium pressure solenoid valve according to claim 1, characterized in that: The upper end of the magnetic shielding tube (51) is provided with a positioning screw sleeve (16), and the internal thread of the positioning screw sleeve (16) is connected to a manual control rod (17). The lower end of the manual control rod (17) extends into the magnetic shielding tube (51) and abuts against the movable iron core (52). The upper end of the manual control rod (17) protrudes from the positioning screw sleeve (16) and is provided with an adjustment handle (18).

3. A normally open medium pressure solenoid valve according to claim 2, characterized in that: The manual control lever (17) has a circumferentially oriented positioning ring groove (19) on its outer side wall. The positioning screw sleeve (16) is threadedly connected to a set screw (20) on its outer side wall. The threaded section of the set screw (20) extends into the positioning ring groove (19). When the manual control lever (17) rotates circumferentially, the threaded section of the set screw (20) moves axially in the positioning ring groove (19).

4. The normally open medium pressure solenoid valve according to claim 2, characterized in that: The manual control lever (17) has a mounting ring groove (21) circumferentially formed on its outer side wall. A sealing ring (22) is nested in the mounting ring groove (21), and the outer ring of the sealing ring (22) abuts against the inner side wall of the magnetic shielding tube (51).

5. The normally open medium pressure solenoid valve according to claim 1, characterized in that: The main valve assembly (4) includes a valve body (41), a valve cover (42) detachably disposed on the upper end of the valve body (41), and a valve seat (43) detachably disposed on the lower end of the valve body (41). The control chamber (3) is formed by the valve body (41) and the valve cover (42), and the detection chamber (12) is formed by the valve body (41) and the valve seat (43).

6. The normally open medium pressure solenoid valve according to claim 1, characterized in that: The upper end of the control chamber (3) is provided with an upper storage groove (23), the upper end of the sealing piston (7) is provided with a lower storage groove (24), and the two ends of the sealing spring (6) are respectively stored in the upper storage groove (23) and the lower storage groove (24).

7. A normally open medium pressure solenoid valve according to claim 6, characterized in that: The sealing piston (7) includes a piston body (71) and a piston head (72). An assembly ring groove (25) is provided on the outer side wall of the piston body (71), and a sealing ring (26) is provided in the assembly ring groove (25). The outer ring of the sealing ring (26) abuts against the inner side wall of the control chamber (3). An assembly groove (27) is provided at the lower end of the piston body (71), and a sealing block (28) for sealing the front end of the main outlet channel (2) is provided in the assembly groove (27). The lower end of the plug (72) abuts against the sealing block (28) to press the sealing block (28) into the assembly groove (27). The upper end of the piston head (72) passes through the sealing block (28) and the piston body (71) and extends into the lower receiving groove (24). The upper end of the piston head (72) is threaded with a nut (29). The nut (29) abuts against the bottom of the lower receiving groove (24). The trigger rod (14) is located at the lower end of the piston head (72).

8. The normally open medium pressure solenoid valve according to claim 1, characterized in that: The main valve assembly (4) has a connecting through hole (30) connecting the main outlet channel (2) and the detection chamber (12). The trigger rod (14) passes through the connecting through hole (30). A sealing ring groove (31) is provided on the outer side wall of the trigger rod (14). A rubber ring (32) is nested in the sealing ring groove (31). The outer ring of the rubber ring (32) abuts against the inner side wall of the sealing ring groove (31).

9. The normally open medium pressure solenoid valve according to claim 1, characterized in that: The movable iron core (52) includes a fixed iron core (521), a movable valve core (522), a sealing block (523), and a valve core spring (524). A limiting groove (33) is formed at the lower end of the fixed iron core (521). A sliding groove (34) is formed on the inner side wall of the upper end of the limiting groove (33), and the width of the limiting groove (33) is greater than the width of the sliding groove (34). The upper end of the movable valve core (522) is slidably disposed in the sliding groove (34). An outwardly flanged edge (35) is formed on the outer side wall of the lower end of the movable valve core (522). The valve core (522) is set in the limiting groove (33). The reset spring (53) is connected to the main valve assembly (4) and the outer flange (35). The lower end of the movable valve core (522) is provided with a slot (36). The sealing block (523) is locked in the slot (36). The upper inner wall of the slot (36) is provided with a receiving groove (37). The groove width of the slot (36) is greater than the groove width of the receiving groove (37). The valve core spring (524) is set in the receiving groove (37) and is connected to the movable valve core (522) and the sealing block (523).

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