Pilot-operated type electromagnetic valve

Abstract

The utility model belongs to the technical field of valve bodies, and particularly relates to a pilot-operated type electromagnetic valve which comprises an electromagnetic coil portion, a sleeve arranged in the electromagnetic coil portion in a penetrating mode, a gland installed on the lower portion of the electromagnetic coil portion, a static iron core installed on the lower portion in the sleeve, and a spring arranged on the upper portion of the static iron core. The upper portion of the spring abuts against a movable iron core, a pilot sealing gasket is arranged at the upper end of the movable iron core, the movable iron core and the pilot sealing gasket are sleeved with a lead screw, an abutting opening is formed in the top end of the lead screw, a pilot valve element is arranged on the upper portion of the lead screw, the pilot valve element is sleeved with an abutting ring, and the lower portion of the side face of the abutting ring is connected with the inner side face of the sleeve. According to the utility model, devices such as the static iron core and the like are all arranged in the sleeve, the sealing performance is higher, and meanwhile, the technical effect that the opening and closing of a channel can be realized by lower power is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of valve body technology, and in particular relates to a pilot-operated solenoid valve. Background Technology

[0002] With the rapid development of hydrogen fuel cell vehicles, high-pressure hydrogen storage systems, as core systems, place stringent demands on the performance of key valve components. The cylinder valve, as the safety control center of the hydrogen storage cylinder assembly, needs to possess rapid response, high-pressure sealing, and precise flow control capabilities. Traditional direct-acting solenoid valves, due to their high drive power and limited opening / closing pressure differential, generally employ pilot-operated solenoid valves. Pilot-operated solenoid valves utilize a two-stage control structure, establishing pressure balance through a pilot orifice and using the medium pressure differential to achieve rapid opening and closing of the main valve core. This structure reduces the control coil power to 5-10W while withstanding working pressures up to 70MPa. However, existing pilot-operated solenoid valves, such as the pilot-operated solenoid valve disclosed in Chinese utility model patent publication number CN218992358U, require multiple sealing treatments to ensure no leakage points in the valve body. Furthermore, the pilot-operated structure is relatively complex. Therefore, a pilot-operated solenoid valve with a simpler structure, effective sealing, and a more streamlined and rational design is needed. Utility Model Content

[0003] To address the aforementioned problems, this utility model proposes a pilot-operated solenoid valve, which effectively solves the issues of numerous sealing points and complex pilot-operated structures in existing technologies.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A pilot-operated solenoid valve includes an electromagnetic coil section, a sleeve is inserted inside the electromagnetic coil section, a pressure cap is installed at the lower part of the electromagnetic coil section, the lower end of the sleeve is connected to the pressure cap, an external thread is provided on the upper outer side of the sleeve, a sealing element is installed on the upper outer side of the sleeve, a stationary iron core is installed at the lower part of the sleeve, a spring is provided on the upper part of the stationary iron core, a moving iron core is abutted on the upper part of the spring, a pilot sealing gasket is provided at the upper end of the moving iron core, and a lead screw is sleeved and installed outside the moving iron core and the pilot sealing gasket. The top end has a stop interface, the upper part of the lead screw is provided with a pilot valve core, the lower side of the pilot valve core has a snap interface, the top outer side of the lead screw is provided with a snap ring, the snap ring passes through the snap interface and snaps into the pilot valve core, the snap interface is provided with a stop part opposite to the stop interface, the pilot valve core is sleeved with a stop ring, the lower side of the stop ring is connected to the inner side of the sleeve, the upper side of the stop ring has a connecting vent hole, the upper side of the stop ring is installed with an annular sealing gasket, the pilot valve core is slidably connected to the snap ring and its upper end abuts against the annular sealing gasket, and the center of the pilot valve core has a pilot hole.

[0005] Furthermore, the upper diameter of the moving iron core is larger than the lower diameter of the moving iron core, the lower end of the moving iron core passes through the spring, and the spring abuts against the middle of the moving iron core.

[0006] Furthermore, the middle part of the moving iron core is threadedly connected to the inner wall of the lead screw.

[0007] Furthermore, the outer side of the stationary iron core is threadedly connected to the inner wall of the sleeve.

[0008] Furthermore, mounting holes are provided on the upper side of the stationary iron core.

[0009] Furthermore, a side air groove is provided on the side of the lead screw at the upper part of the retaining ring, and a retaining groove is provided inside the pilot valve core. The retaining ring is located in the retaining groove, and the width of the retaining groove is greater than the thickness of the retaining ring.

[0010] Furthermore, an outer convex ring is provided on the outer side of the middle part of the sleeve, the lower side of the outer convex ring is in contact with the upper side of the electromagnetic coil part, and the lower end of the sleeve is threadedly connected to the pressure cap.

[0011] Furthermore, a countersunk hole with a raised ring is provided on the upper side of the electromagnetic coil part, and the outer raised ring is disposed in the countersunk hole with a fitting sealing groove provided on the upper side of the electromagnetic coil part with a fitting sealing ring disposed in the fitting sealing groove.

[0012] Furthermore, an inner boss is provided on the upper inner side of the abutment ring, and an outer boss is provided on the side of the pilot valve core, with the upper side of the outer boss abutting against the lower side of the inner boss.

[0013] Furthermore, an outer sealing groove is provided on the upper side of the gland, and an outer sealing ring is installed in the outer sealing groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In this invention, the stationary iron core and other components are all located inside the sleeve to avoid additional leakage points and improve sealing performance. At the same time, the pilot valve core, in conjunction with the retaining ring at the top of the lead screw, achieves a movable locking connection. Together with the electromagnetic coil, stationary iron core, and moving iron core, a pilot-operated seal is achieved. The opening and closing of the channel can be achieved with relatively low power. Furthermore, this invention has high integration and a more reasonable and compact structure. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the internal structure of this utility model;

[0017] Figure 2 for Figure 1 Enlarged view of the structure of section A in the middle;

[0018] Figure 3This is a three-dimensional structural diagram of the present invention;

[0019] Figure 4 This is a schematic diagram of the connection structure between the lead screw and the pilot valve core.

[0020] Figure 5 This is a schematic diagram of the top structure of the lead screw.

[0021] In the diagram: 1. Electromagnetic coil section; 2. Sleeve; 3. Gland; 4. Stationary iron core; 5. Spring; 6. Moving iron core; 7. Pilot sealing gasket; 8. Lead screw; 9. Abutment interface; 10. Pilot valve core; 11. Snap interface; 12. Snap ring; 13. Abutment part; 14. Abutment ring; 15. Connecting vent; 16. Annular sealing gasket; 17. Pilot hole; 18. Mounting hole; 19. Side air groove; 20. Snap groove; 21. Outer convex ring; 22. Convex ring countersunk hole; 23. Fitting sealing groove; 24. Inner boss; 25. Outer boss; 26. Outer sealing groove; 27. Sealing element one; 28. Channel one. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1-3 As shown, a pilot-operated solenoid valve includes a solenoid coil section 1, which comprises a solenoid coil and a housing for accommodating the solenoid coil. A through hole is provided at the center of the solenoid coil section 1. A sleeve 2 is inserted inside the solenoid coil section 1, with the inner wall of the sleeve 2 fitting against the inner wall of the through hole. A pressure cap 3 is installed at the lower part of the solenoid coil section 1. A threaded hole is provided on the upper side of the pressure cap 3. An external thread is provided on the outer side of the lower end of the sleeve 2. The lower end of the sleeve 2 is threadedly connected to the threaded hole on the pressure cap 3. The upper part of the sleeve 2... The sleeve 2 has an external thread on its outer side. A sealing groove is formed on the upper outer side of the sleeve 2. A sealing element 27, which is a rubber sealing ring, is installed inside the sealing groove. A downward-facing receiving cavity is formed at the center of the upper end of the sleeve 2. A stationary iron core 4 is installed at the bottom of the receiving cavity inside the sleeve 2. A spring 5 is provided on the upper part of the stationary iron core 4. A moving iron core 6 is abutted on the upper part of the spring 5. A pilot sealing gasket 7 is provided on the upper end of the moving iron core 6. A screw 8 is installed on the outside of the moving iron core 6 and the pilot sealing gasket 7.

[0024] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the top of the lead screw 8 has a stop interface 9, the upper part of the lead screw 8 is provided with a pilot valve core 10, the lower side of the pilot valve core 10 has a locking interface 11, the top outer side of the lead screw 8 is provided with an integrally connected retaining ring 12, the retaining ring 12 passes through the locking interface 11 and is locked into the pilot valve core 10, the locking interface 11 is provided with a stop part 13 opposite to the stop interface 9, the stop part 13 is integrally formed with the pilot valve core 10 and is obtained by CNC machining, the pilot valve core 10 is sleeved with a stop ring 14, the lower side of the stop ring 14 is threaded to the inner side of the sleeve 2, the upper part of the stop ring 14... A plurality of vent holes 15 are provided on the side and are evenly distributed around the abutment ring 14. An annular sealing gasket 16 is installed on the upper side of the abutment ring 14 and an abutment groove is provided on the lower side of the annular sealing gasket 16. The upper end of the abutment ring 14 is engaged in the abutment groove. The pilot valve core 10 is slidably connected to the retaining ring 12 and its upper end abuts against the annular sealing gasket 16. The upper edge of the pilot valve core 10 is chamfered and abuts against the lower part of the inner wall of the annular sealing gasket 16. A pilot hole 17 is provided in the center of the pilot valve core 10 and extends from the upper center of the pilot valve core 10 to the lower end of the abutment part 13.

[0025] In this embodiment, the upper diameter of the moving iron core 6 is larger than the lower diameter of the moving iron core 6, and the lower end of the moving iron core 6 passes through the spring 5, so that the upper end of the spring 5 can abut against the middle of the moving iron core 6 to prevent the spring 5 from shifting during compression.

[0026] In this embodiment, the middle part of the moving iron core 6 is provided with an external thread, and the inner wall of the lead screw 8 is provided with an internal thread. The moving iron core 6 and the inner wall of the lead screw 8 are connected by threads. Through the threaded connection, the movement of the moving iron core 6 can drive the lead screw 8 to move.

[0027] In this embodiment, the outer side of the stationary iron core 4 is provided with external threads, and the bottom of the inner wall of the sleeve 2 is provided with internal threads. The stationary iron core 4 and the sleeve 2 are connected by threads.

[0028] In this embodiment, the upper side of the stationary iron core 4 is provided with a mounting hole 18, which is a hexagonal bolt hole. The stationary iron core 4 can be directly fixed to the bottom of the sleeve 2 by threaded connection through the mounting hole 18 using a hexagonal wrench.

[0029] like Figure 1 , Figure 4 and Figure 5As shown, in this embodiment, a side air groove 19 is provided on the side of the lead screw 8 at the upper part of the retaining ring 12, and a retaining groove 20 is provided inside the pilot valve core 10. The retaining ring 12 is located in the retaining groove 20, and the width of the retaining groove 20 is greater than the thickness of the retaining ring 12, so that the retaining ring 12 can slide up and down in the retaining groove 20.

[0030] like Figure 1 As shown, in this embodiment, an outer protruding ring 21 is integrally connected to the outer side of the middle part of the sleeve 2. The lower side of the outer protruding ring 21 is attached to the upper side of the electromagnetic coil part 1. The lower end of the sleeve 2 is threadedly connected to the pressure cover 3. By locking the pressure cover 3 with the thread, the lower side of the outer protruding ring 21 is tightly attached to the electromagnetic coil part 1, thereby clamping and fixing the electromagnetic coil part 1.

[0031] In this embodiment, a countersunk hole 22 is provided on the upper side of the electromagnetic coil part 1, and an outer countersunk hole 22 is provided in the countersunk hole 22. A fitting sealing groove 23 is provided on the upper side of the electromagnetic coil part 1, and a fitting sealing ring is provided in the fitting sealing groove 23.

[0032] In this embodiment, an inner boss 24 is provided on the upper inner side of the abutment ring 14, and an outer boss 25 is provided on the side of the pilot valve core 10. The upper side of the outer boss 25 abuts against the lower side of the inner boss 24.

[0033] In this embodiment, an outer sealing groove 26 is provided on the upper side of the pressure cover 3, and an outer sealing ring is installed in the outer sealing groove 26.

[0034] In the closed state, the moving iron core 6 is driven by the elastic potential energy of the spring 5 to move the lead screw 8 upward, thereby causing the pilot sealing gasket 7 inside the lead screw 8 to abut against the lower part of the pilot hole 17. At this time, the pilot hole 17 is closed. At this time, the top of the pilot valve core 10 moves upward and abuts against the annular sealing gasket 16. At this time, the channel 28 is separated from the connecting air hole 15 on the retaining ring 12 to form a seal.

[0035] In the open state, the electromagnetic coil 1 generates a magnetic field, causing the stationary iron core 4 and the moving iron core 6 to attract each other, thus moving the moving iron core 6 closer to the stationary iron core 4. At this time, the pilot sealing gasket 7 inside the sleeve 2 moves downward, and the pilot hole 17 is in a connected state. At this time, the gas enters the lower part of the pilot valve core 10 through the pilot hole 17. Due to the influence of gas pressure, the pilot valve core 10 moves downward. At this time, the top of the pilot valve core 10 is no longer in contact with the annular sealing gasket 16. At this time, the channel 28 is connected to the connecting air hole 15 on the retaining ring 12, and the gas can pass through the pilot-operated solenoid valve.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pilot-operated solenoid valve, characterized in that: The device includes an electromagnetic coil section (1), a sleeve (2) is installed inside the electromagnetic coil section (1), a pressure cap (3) is installed at the lower part of the electromagnetic coil section (1), the lower end of the sleeve (2) is connected to the pressure cap (3), an external thread is provided on the upper outer side of the sleeve (2), a sealing element (27) is installed on the upper outer side of the sleeve (2), a stationary iron core (4) is installed at the lower part of the sleeve (2), a spring (5) is provided on the upper part of the stationary iron core (4), a moving iron core (6) is abutted on the upper part of the spring (5), a pilot sealing gasket (7) is provided on the upper end of the moving iron core (6), a screw (8) is sleeved on the outside of the moving iron core (6) and the pilot sealing gasket (7), a contact port (9) is provided at the top end of the screw (8), and a pilot valve core (10) is provided on the upper part of the screw (8). The lower side of the pilot valve core (10) is provided with a snap-fit ​​interface (11), and the top outer side of the lead screw (8) is provided with a snap ring (12). The snap ring (12) passes through the snap-fit ​​interface (11) and snaps into the pilot valve core (10). The snap-fit ​​interface (11) is provided with an abutment part (13) opposite to the abutment interface (9). An abutment ring (14) is sleeved on the outside of the pilot valve core (10). The lower side of the abutment ring (14) is connected to the inner side of the sleeve (2). The upper side of the abutment ring (14) is provided with a connecting air hole (15). An annular sealing gasket (16) is installed on the upper side of the abutment ring (14). The pilot valve core (10) is slidably connected to the snap ring (12) and its upper end abuts against the annular sealing gasket (16). A pilot hole (17) is provided in the center of the pilot valve core (10).

2. The pilot-operated solenoid valve according to claim 1, characterized in that: The upper diameter of the moving iron core (6) is larger than the lower diameter of the moving iron core (6), and the lower end of the moving iron core (6) is inserted into the spring (5), with the spring (5) abutting against the middle of the moving iron core (6).

3. The pilot-operated solenoid valve according to claim 1, characterized in that: The middle part of the moving iron core (6) is threadedly connected to the inner wall of the lead screw (8).

4. The pilot-operated solenoid valve according to claim 1, characterized in that: The outer side of the stationary iron core (4) is threadedly connected to the inner wall of the sleeve (2).

5. The pilot-operated solenoid valve according to claim 4, characterized in that: The upper side of the stationary iron core (4) is provided with mounting holes (18).

6. The pilot-operated solenoid valve according to claim 1, characterized in that: The upper part of the retaining ring (12) has a side air groove (19) on the side of the lead screw (8), and the pilot valve core (10) has a retaining groove (20) inside. The retaining ring (12) is located in the retaining groove (20), and the width of the retaining groove (20) is greater than the thickness of the retaining ring (12).

7. The pilot-operated solenoid valve according to claim 1, characterized in that: The sleeve (2) has an outer protruding ring (21) on the outer side of the middle part. The lower side of the outer protruding ring (21) is attached to the upper side of the electromagnetic coil part (1). The lower end of the sleeve (2) is threadedly connected to the pressure cap (3).

8. The pilot-operated solenoid valve according to claim 7, characterized in that: The upper side of the electromagnetic coil part (1) is provided with a convex ring countersunk hole (22), and the outer convex ring (21) is disposed in the convex ring countersunk hole (22). The upper side of the electromagnetic coil part (1) is provided with a fitting sealing groove (23), and a fitting sealing ring is disposed in the fitting sealing groove (23).

9. The pilot-operated solenoid valve according to claim 1, characterized in that: The upper inner side of the abutment ring (14) is provided with an inner boss (24), and the side of the pilot valve core (10) is provided with an outer boss (25). The upper side of the outer boss (25) abuts against the lower side of the inner boss (24).

10. The pilot-operated solenoid valve according to claim 1, characterized in that: The upper side of the pressure cap (3) is provided with an outer sealing groove (26), and an outer sealing ring is installed in the outer sealing groove (26).

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