Electromagnetic valve for thermal management system

Abstract

The utility model provides an electromagnetic valve for a heat management system, relates to the technical field of electromagnetic valves, and aims to solve the technical problem that in the prior art, an electromagnetic valve which is conducted in a one-way mode cannot meet application scenes needing two-way conduction. An electromagnetic valve for a thermal management system is characterized in that the left end of a first mounting cavity is communicated with a first air port, the right end of the first mounting cavity is communicated with a pressure relief hole through a first flow channel, a first valve needle is movably arranged in the first mounting cavity, the upper end of the first mounting cavity is communicated with a second mounting cavity through a second flow channel, and the second mounting cavity is communicated with a chamber; the third mounting cavity is communicated with the second air port through a third flow channel, the third mounting cavity is communicated with the chamber, the third valve needle is movably connected into the third mounting cavity, the fourth mounting cavity is located below the pressure relief hole, the upper end of the pressure relief hole is communicated with the chamber, and the lower end of the pressure relief hole is communicated with the fourth mounting cavity; the fourth mounting cavity is communicated with the second air port, and the fourth valve needle is movably connected into the fourth mounting cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve used in a thermal management system. Background Art

[0002] Various types of solenoid valves are often used in thermal management systems to control and regulate fluid media. Common solenoid valves include valve seats, pistons, valve cover assemblies, return springs, moving iron cores, static iron cores, coil assemblies, etc. The solenoid valve takes in air from the side holes of the valve seat and exhausts air from the lower holes. When the coil assembly is energized, the static iron core generates a magnetic field, driving the moving iron core to move. At the same time, the piston moves to connect the air inlet with the air outlet. After the coil assembly is powered off, the return spring resets the moving iron core and the piston. In some application scenarios of thermal management systems, two-way communication of pipelines is often required, but the above-mentioned solenoid valve can only take in air from the air inlet and exhaust air from the air outlet, and can only achieve one-way conduction. Therefore, it cannot meet some application scenarios that require two-way conduction. Utility Model Content

[0003] In view of the deficiencies of the prior art, the purpose of the present utility model is to provide a solenoid valve for a thermal management system, so as to solve the technical problem that the unidirectional conductive solenoid valve in the prior art cannot meet the application scenarios that require bidirectional conductive conduction.

[0004] To solve the above technical problems, the utility model provides a solenoid valve for a thermal management system, comprising a valve seat, a moving iron core and a driving assembly, the moving iron core is vertically movably connected to the valve seat, the driving assembly is connected to the valve seat and is used to control the moving iron core to move vertically, wherein, it also includes a piston, a first valve needle, a second valve needle, a third valve needle, a fourth valve needle, a first spring, a second spring and a third spring, a side wall of the valve seat is provided with a first air port, a bottom end of the valve seat is provided with a second air port, the piston is vertically slidably connected to the valve seat and is located below the moving iron core, a chamber is formed between the top end of the piston and the inner wall of the valve seat, a pressure relief hole, a first flow channel, a second flow channel, a third flow channel, a first installation cavity, a second installation cavity, a third installation cavity and a fourth installation cavity are provided in the piston, the pressure relief hole is arranged in the vertical direction, the left end of the first installation cavity is connected to the first air port, the right end of the first installation cavity is connected to the pressure relief hole through the first flow channel, the first valve needle is movably arranged in the first installation cavity along the horizontal direction, the first spring is connected to The cam is connected to the first valve needle and drives the first valve needle to block the first flow channel to the right, the upper end of the first installation chamber is communicated with the lower end of the second installation chamber through the second flow channel, the upper end of the second installation chamber is communicated with the chamber, the second valve needle is vertically movably connected in the second installation chamber, the second spring is connected to the second valve needle and drives the second valve needle to block the second flow channel downward, the lower end of the third installation chamber is communicated with the second air port through the third flow channel, the upper end of the third installation chamber is communicated with the chamber, the third valve needle is vertically movably connected in the third installation chamber, the third spring is connected to the third valve needle and drives the third valve needle to block the third flow channel downward, the fourth installation chamber is located below the pressure relief hole, the upper end of the pressure relief hole is communicated with the chamber, the lower end of the pressure relief hole is communicated with the fourth installation chamber, the fourth installation chamber is communicated with the second air port, the fourth valve needle is vertically movably connected in the fourth installation chamber and is used to block the lower end of the pressure relief hole upward, and in the initial state, the moving iron core blocks the upper end of the pressure relief hole and the bottom end of the piston abuts against the bottom end inside the valve seat to block the first air port and the second air port.

[0005] After adopting the above structure, the solenoid valve for thermal management system of the utility model has the following advantages: when the first air port takes in air, the moving iron core blocks the upper end of the pressure relief hole, and the gas enters from the first installation cavity. At this time, the gas generates rightward pressure on the first valve needle, so that the first valve needle still blocks the left end of the first flow channel, and the gas enters the second flow channel and exerts an upward force on the second valve needle, overcoming the elastic force of the second spring, so that the second valve needle moves away from the second flow channel, and the gas enters the chamber through the second flow channel and the second installation cavity, and the gas entering the chamber exerts a downward force on the third valve needle, and the third valve needle still blocks the upper end of the third flow channel. At this time, the piston remains in a force balance state. After the driving component drives the moving iron core to move upward, the chamber is connected with the pressure relief hole, and the gas enters the pressure relief hole, resulting in a decrease in the pressure in the chamber and a pressure difference. The pressure difference causes the piston to move upward so that the first air port is connected with the second air port, and the gas is discharged from the second air port. At the same time, the gas will also flow out from the pressure relief hole to the second air port through the chamber, maintaining the pressure difference so that the piston remains In the upper position, after the driving assembly drives the moving iron core to move downward, the moving iron core re-blocks the upper end of the pressure relief hole so that the pressure difference disappears, and the piston moves downward under the action of the moving iron core and re-blocks the first air port and the second air port; when the second air port intakes air, the gas exerts an upward force on the fourth valve needle, so that the fourth valve needle blocks the lower end of the pressure relief hole, and the gas enters from the third flow channel and exerts an upward force on the third valve needle, overcoming the elastic force of the third spring so that the third valve needle is away from the third flow channel, and the gas enters the chamber through the third flow channel and the third installation cavity, and the gas in the chamber exerts a downward force on the second valve needle so that the second valve needle still blocks the second flow channel. Similarly, after the moving iron core opens the pressure relief hole, the pressure difference is used to make the piston rise, and the second air port is connected with the first air port, and at the same time, the gas flows from the chamber through the first flow channel and the first installation cavity into the first air port. After the moving iron core closes the pressure relief hole, the piston also re-blocks the first air port and the second air port; in this way, the two-way conduction of the solenoid valve is realized, which can meet some application scenarios in the thermal management system that require two-way conduction.

[0006] As an improvement, a first groove is provided at the bottom end of the moving iron core, and a first sealing ring is connected to the first groove. In the initial state, the first sealing ring seals the upper end of the pressure relief hole. With this structure, the sealing effect of the moving iron core on the upper end of the pressure relief hole is increased by setting the first sealing ring.

[0007] As an improvement, a limiting pad is connected in the first groove, and a first annular groove is circumferentially provided on the outer peripheral wall of the lower part of the first sealing ring, and the upper end of the limiting pad is abutted against the top of the first annular groove; by adopting this structure, the limiting pad is used to improve the stability of the connection between the first sealing ring and the moving iron core.

[0008] As an improvement, a second groove is provided at the bottom end of the piston, and a second sealing ring is connected to the second groove. In the initial state, the bottom end of the second sealing ring abuts against the bottom end of the valve seat to block the first air port and the second air port. With this structure, the second sealing ring is used to improve the sealing effect of the piston on the first air port and the second air port.

[0009] As an improvement, the drive assembly includes a static iron core, a coil assembly and a fifth spring. The coil assembly is connected to the top of the valve seat, the static iron core is connected to the coil assembly and is located above the moving iron core, and the fifth spring is connected between the top of the moving iron core and the bottom of the static iron core. With this structure, the upward movement of the moving iron core is controlled by the coil assembly and the static iron core, and the downward movement is controlled by the fifth spring.

[0010] As an improvement, a first truncated cone portion is provided at the top end of the moving iron core, a first truncated cone groove is provided at the bottom end of the stationary iron core, and the first truncated cone portion is slidably connected in the first truncated cone groove; with this structure, according to mold flow analysis, under high pressure environment, the provision of the first truncated cone portion and the first truncated cone groove can enable the moving iron core to move stably.

[0011] As an improvement, a first annular convex portion is provided on the outer circumferential wall of the first valve needle in the circumferential direction, the first annular convex portion slides in cooperation with the first mounting cavity, a first through hole is provided on the first annular convex portion in the horizontal direction, the first spring abuts between the left end of the first annular convex portion and the inner wall of the first mounting cavity, a second annular convex portion is provided on the outer circumferential wall of the second valve needle in the circumferential direction, the second annular convex portion slides in cooperation with the second mounting cavity, a second through hole is provided on the second annular convex portion in the vertical direction, the second spring abuts between the top end of the second annular convex portion and the inner wall of the second mounting cavity, a third annular convex portion is provided on the outer circumferential wall of the third valve needle in the circumferential direction, the third annular convex portion slides in cooperation with the third mounting cavity, a third through hole is provided on the third annular convex portion in the vertical direction, and the third spring abuts between the top end of the third annular convex portion and the inner wall of the third mounting cavity; adopting this structure, by arranging the first annular convex portion, the second annular convex portion and the third annular convex portion, the movement of the first valve needle, the second valve needle and the third valve needle is more stable.

[0012] As an improvement, the right end of the first valve needle, the left end of the first flow channel, the lower end of the second valve needle, the upper end of the second flow channel, the lower end of the third valve needle, the upper end of the third flow channel, the upper end of the fourth valve needle and the lower end of the pressure relief hole are all truncated cone-shaped; with this structure, the truncated cone-shaped structure enables each valve to have a better sealing effect on each flow channel and pressure relief hole.

[0013] As an improvement, the fourth valve needle is provided with a fourth flow channel and a fifth flow channel. The fourth flow channel runs through the fourth valve needle in the horizontal direction and is connected with the fourth mounting cavity. The fifth flow channel is arranged in the vertical direction. The upper end of the fifth flow channel is connected with the fourth flow channel, and the lower end of the fifth flow channel is connected with the second air port. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the utility model.

[0015] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0016] Figure 3 It is a three-dimensional structural schematic diagram of the utility model.

[0017] Figure numerals: 1, valve seat; 2, moving iron core; 3, drive assembly; 31, stationary iron core; 32, coil assembly; 33, fifth spring; 4, piston; 5, first valve needle; 6, second valve needle; 7, third valve needle; 8, fourth valve needle; 9, first spring; 10, second spring; 11, third spring; 12, first air port; 13, second air port; 14, chamber; 15, pressure relief hole; 16, first flow channel; 17, second flow channel; 18, third flow channel; 19, first installation cavity; 20, second installation cavity cavity; 21, third installation cavity; 22, fourth installation cavity; 23, first groove; 24, first sealing ring; 25, limit pad; 26, first annular groove; 27, second groove; 28, second sealing ring; 29, second annular groove; 30, fourth spring; 34, first truncated cone portion; 35, first truncated cone groove; 36, first annular convex portion; 37, first through hole; 38, second annular convex portion; 39, second through hole; 40, third annular convex portion; 41, third through hole; 42, fourth flow channel; 43, fifth flow channel. DETAILED DESCRIPTION

[0018] The following is a detailed description of a solenoid valve for a thermal management system of the utility model in conjunction with the accompanying drawings.

[0019] like Figures 1 to 3 As shown, a solenoid valve for a thermal management system includes a valve seat 1, a moving iron core 2 and a drive assembly 3. The moving iron core 2 is vertically movably connected in the valve seat 1. The drive assembly 3 is connected to the valve seat 1 and is used to control the vertical movement of the moving iron core 2. The drive assembly 3 includes a static iron core 31, a coil assembly 32 and a fifth spring 33. The coil assembly 32 is connected to the top of the valve seat 1. The static iron core 31 is connected to the coil assembly 32 and is located above the moving iron core 2. The fifth spring 33 is connected between the top of the moving iron core 2 and the bottom of the static iron core 31. When the coil assembly 32 is energized, the static iron core 31 generates a magnetic field to attract the moving iron core 2 to move upward. When the power is off, the magnetic field disappears, and the fifth spring 33 drives the moving iron core 2 to move downward. In addition, Figure 1 As shown, a first truncated cone portion 34 is provided at the top end of the moving iron core 2, and a first truncated cone groove 35 is provided at the bottom end of the stationary iron core 31. The first truncated cone portion 34 is slidably connected in the first truncated cone groove 35. The inclined surface cooperation of the first truncated cone portion 34 and the first truncated cone groove 35 is more conducive to the stationary iron core 31 driving the moving iron core 2 under high pressure, and the specific inclinations of the first truncated cone portion 34 and the first truncated cone groove 35 are determined by mold flow analysis according to the specific working pressure.

[0020] The utility model also includes a piston 4, a first valve needle 5, a second valve needle 6, a third valve needle 7, a fourth valve needle 8, a first spring 9, a second spring 10 and a third spring 11, a first gas port 12 is provided on the side wall of the valve seat 1, and a second gas port 13 is provided at the bottom end of the valve seat 1. Figure 3 As shown, in this embodiment, a plurality of first air ports 12 are equidistantly distributed on the side wall of the valve seat 1 along the circumferential direction, and the first air ports 12 and the second air ports 13 themselves are connected by the inner cavity of the hollow valve seat 1; the piston 4 is vertically slidably connected in the valve seat 1 and is located below the moving iron core 2, and a chamber 14 is formed between the top end of the piston 4 and the inner wall of the valve seat 1. Specifically, a valve cover assembly is fixedly connected to the top end of the inner wall of the valve seat 1, and the valve cover assembly and the top end of the piston 4 form a chamber 14.

[0021] like Figure 1 and Figure 2 As shown, a pressure relief hole 15, a first flow channel 16, a second flow channel 17, a third flow channel 18, a first installation cavity 19, a second installation cavity 20, a third installation cavity 21 and a fourth installation cavity 22 are provided in the piston 4. The pressure relief hole 15 is arranged in the vertical direction, the first installation cavity 19 and the second installation cavity 20 are located on the left side of the pressure relief hole 15, and the third installation cavity 21 is located on the right side of the pressure relief hole 15; the left end of the first installation cavity 19 is connected with the first gas port 12, and the right end of the first installation cavity 19 is connected with the pressure relief hole 15 through the first flow channel 16. The first valve needle 5 is movably arranged in the first installation cavity 19 along the horizontal direction, that is, the left and right direction. The first spring 9 connects the first valve needle 5 and drives the first valve needle 5 to block the first flow channel 16 to the right; the upper end of the first installation cavity 19 is connected with the lower end of the second installation cavity 20 through the second flow channel 17, and the upper end of the second installation cavity 20 is connected with the chamber 14. The second valve needle 6 is movably connected in the second installation cavity 20 along the vertical direction, and the second spring 10 connects the second valve needle 6 and drives the second valve needle 5 to block the first flow channel 16 to the right. The needle 6 blocks the second flow channel 17 downward; the lower end of the third installation cavity 21 is connected to the second air port 13 through the third flow channel 18, and the upper end of the third installation cavity 21 is connected to the chamber 14. The third valve needle 7 is vertically movably connected in the third installation cavity 21. The third spring 11 connects the third valve needle 7 and drives the third valve needle 7 to block the third flow channel 18 downward; the fourth installation cavity 22 is located below the pressure relief hole 15, the upper end of the pressure relief hole 15 is connected to the chamber 14, and the lower end of the pressure relief hole 15 is connected to the fourth installation cavity 22 , the fourth installation cavity 22 is communicated with the second air port 13, and the fourth valve needle 8 is vertically movably connected in the fourth installation cavity 22 and is used to block the lower end of the pressure relief hole 15 upward; in the initial state, the moving iron core 2 blocks the upper end of the pressure relief hole 15 and the bottom end of the piston 4 abuts against the bottom end inside the valve seat 1 to block the first air port 12 and the second air port 13. Specifically, an annular protrusion is provided at the bottom end of the valve seat 1 along the edge of the second air port 13, and the bottom end of the piston 4 in the initial state abuts against the top end of the annular protrusion.

[0022] like Figure 1 and Figure 2As shown, a first groove 23 is provided at the bottom end of the moving iron core 2, and a first sealing ring 24 is connected to the first groove 23. In the initial state, the first sealing ring 24 blocks the upper end of the pressure relief hole 15; in addition, a limiting pad 25 is connected to the first groove 23, and a first annular groove 26 is circumferentially provided on the outer peripheral wall of the lower part of the first sealing ring 24, and the upper end of the limiting pad 25 is against the top end of the first annular groove 26.

[0023] like Figure 1 and Figure 2 As shown, a second groove 27 is provided at the bottom end of the piston 4, and a second sealing ring 28 is connected to the second groove 27. In the initial state, the bottom end of the second sealing ring 28 abuts against the bottom end of the inside of the valve seat 1 (that is, the annular protrusion) to block the first gas port 12 and the second gas port 13.

[0024] like Figure 1 and Figure 2 As shown, a second annular groove 29 is circumferentially provided on the outer peripheral wall of the lower part of the piston 4, and a compressed fourth spring 30 is provided in the second annular groove 29, the upper end of the fourth spring 30 abuts against the top end of the second annular groove 29, and the lower end of the fourth spring 30 abuts against the bottom end inside the valve seat 1.

[0025] like Figure 1 and Figure 2 As shown, a first annular protrusion 36 is circumferentially provided on the outer circumferential wall of the first valve needle 5, the first annular protrusion 36 is slidably matched with the first mounting cavity 19, a first through hole 37 is horizontally provided on the first annular protrusion 36, and the first spring 9 abuts between the left end of the first annular protrusion 36 and the inner wall of the first mounting cavity 19; a second annular protrusion 38 is circumferentially provided on the outer circumferential wall of the second valve needle 6, the second annular protrusion 38 is slidably matched with the second mounting cavity 20, and a second through hole 39 is vertically provided on the second annular protrusion 38, The second spring 10 is abutted between the top of the second annular protrusion 38 and the inner wall of the second installation cavity 20. A third annular protrusion 40 is provided on the outer peripheral wall of the third valve needle 7 in the circumferential direction. The third annular protrusion 40 is slidably matched with the third installation cavity 21. A third through hole 41 is vertically provided on the third annular protrusion 40. The third spring 11 is abutted between the top of the third annular protrusion 40 and the inner wall of the third installation cavity 21. A fourth annular protrusion is provided on the outer peripheral wall of the fourth valve needle 8 in the circumferential direction. The fourth annular protrusion is slidably matched with the fourth installation cavity 22. The fourth valve needle 8 is provided with a fourth flow channel 42 and a fifth flow channel 43. The fourth flow channel 42 passes through the fourth valve needle 8 in the horizontal direction and is connected to the fourth installation cavity 22. The fifth flow channel 43 is provided in the vertical direction. The upper end of the fifth flow channel 43 is connected to the fourth flow channel 42, and the lower end of the fifth flow channel 43 is connected to the second gas port 13. In addition, the right end of the first valve needle 5, the left end of the first flow channel 16, the lower end of the second valve needle 6, the upper end of the second flow channel 17, the lower end of the third valve needle 7, the upper end of the third flow channel 18, the upper end of the fourth valve needle 8 and the lower end of the pressure relief hole 15 are all truncated cone-shaped.

[0026] When the first air port 12 is inlet, the moving iron core 2 blocks the upper end of the pressure relief hole 15, and the gas enters from the first installation cavity 19. At this time, the gas exerts a rightward pressure on the first valve needle 5, so the first valve needle 5 still blocks the left end of the first flow channel 16. The gas enters the second flow channel 17 and exerts an upward force on the second valve needle 6, overcoming the elastic force of the second spring 10, so that the second valve needle 6 is away from the second flow channel 17. The gas enters the chamber 14 through the second flow channel 17 and the second installation cavity 20, and the gas entering the chamber 14 exerts a downward force on the third valve needle 7, and the third valve needle 7 still blocks the upper end of the third flow channel 18. At this time, the piston 4 remains in a force balance state. After the driving component 3 drives the moving iron core 2 to move upward, the chamber 14 is connected with the pressure relief hole 15, and the gas enters the pressure relief hole 15, causing the pressure in the chamber 14 to decrease and generate a pressure difference. The pressure difference causes the piston 4 to move upward so that the first air port 12 is connected with the second air port 13, and the gas is discharged from the second air port 13. The moving distance of the piston 4 is less than the moving distance of the moving iron core 2. Therefore, the chamber 14 and the pressure relief hole 15 remain in a connected state. At the same time, the gas will also flow out from the pressure relief hole 15 through the chamber 14 to the second air port 13, maintaining the pressure difference so that the piston 4 remains In the upper position, after the driving assembly 3 drives the moving iron core 2 to move downward, the moving iron core 2 re-blocks the upper end of the pressure relief hole 15 to make the pressure difference disappear, and the piston 4 moves downward under the action of the moving iron core 2 and re-blocks the first air port 12 and the second air port 13; when the second air port 13 takes in air, the gas applies an upward force to the fourth valve needle 8, so that the fourth valve needle 8 blocks the lower end of the pressure relief hole 15, and the gas enters from the third flow channel 18 and applies an upward force to the third valve needle 7, overcoming the elastic force of the third spring 11 to make the third valve needle 7 move away from the third flow channel 18, and the gas enters the chamber through the third flow channel 18 and the third installation cavity 21. 14, the gas in the chamber 14 applies a downward force to the second valve needle 6 so that the second valve needle 6 still blocks the second flow channel 17. Similarly, after the moving iron core 2 opens the pressure relief hole 15, the pressure difference is used to make the piston 4 rise, and the second air port 13 is connected with the first air port 12. At the same time, the gas flows from the chamber 14 through the first flow channel 16 and the first installation cavity 19 into the first air port 12. After the moving iron core 2 closes the pressure relief hole 15, the piston 4 also blocks the first air port 12 and the second air port 13 again; in this way, the two-way conduction of the solenoid valve is realized, which can meet some application scenarios in the thermal management system that require two-way conduction.

[0027] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned one implementation mode, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

Claims

1. A solenoid valve for a thermal management system, comprising a valve seat (1), a moving iron core (2) and a drive assembly (3), wherein the moving iron core (2) is vertically movably connected to the valve seat (1), and the drive assembly (3) is connected to the valve seat (1) and is used to control the moving iron core (2) to move vertically, characterized in that: The valve seat (1) further comprises a piston (4), a first valve needle (5), a second valve needle (6), a third valve needle (7), a fourth valve needle (8), a first spring (9), a second spring (10) and a third spring (11); the side wall of the valve seat (1) is provided with a first air port (12); the bottom end of the valve seat (1) is provided with a second air port (13); the piston (4) is vertically slidably connected in the valve seat (1) and is located below the moving iron core (2); a chamber (14) is formed between the top end of the piston (4) and the inner wall of the valve seat (1); the piston (4) is provided with a pressure relief hole (15), a first flow channel (16), a second flow channel (17), a third flow channel (18), a first installation cavity (19), a second installation cavity (11), and a third spring (12); The first mounting cavity (20), the third mounting cavity (21) and the fourth mounting cavity (22), the pressure relief hole (15) is arranged in the vertical direction, the left end of the first mounting cavity (19) is connected to the first air port (12), the right end of the first mounting cavity (19) is connected to the pressure relief hole (15) through the first flow channel (16), the first valve needle (5) is movably arranged in the first mounting cavity (19) along the horizontal direction, the first spring (9) is connected to the first valve needle (5) and drives the first valve needle (5) to block the first flow channel (16) to the right, the upper end of the first mounting cavity (19) is connected to the lower end of the second mounting cavity (20) through the second flow channel (17), and the The upper end of the second installation cavity (20) is communicated with the chamber (14); the second valve needle (6) is vertically movably connected in the second installation cavity (20); the second spring (10) is connected to the second valve needle (6) and drives the second valve needle (6) to block the second flow channel (17) downward; the lower end of the third installation cavity (21) is communicated with the second air port (13) through the third flow channel (18); the upper end of the third installation cavity (21) is communicated with the chamber (14); the third valve needle (7) is vertically movably connected in the third installation cavity (21); the third spring (11) is connected to the third valve needle (7) and drives the third valve needle (7) to block the second flow channel (17) downward; The third flow channel (18), the fourth installation cavity (22) is located below the pressure relief hole (15), the upper end of the pressure relief hole (15) is connected to the chamber (14), the lower end of the pressure relief hole (15) is connected to the fourth installation cavity (22), the fourth installation cavity (22) is connected to the second air port (13), the fourth valve needle (8) is vertically movably connected in the fourth installation cavity (22) and is used to block the lower end of the pressure relief hole (15) upwards, in the initial state, the moving iron core (2) blocks the upper end of the pressure relief hole (15) and the bottom end of the piston (4) abuts against the bottom end of the inside of the valve seat (1) to block the first air port (12) and the second air port (13).

2. The solenoid valve for a thermal management system according to claim 1, characterized in that: A first groove (23) is provided at the bottom end of the moving iron core (2), and a first sealing ring (24) is connected inside the first groove (23). In an initial state, the first sealing ring (24) blocks the upper end of the pressure relief hole (15).

3. The solenoid valve for a thermal management system according to claim 2, characterized in that: A limiting pad (25) is connected inside the first groove (23), a first annular groove (26) is circumferentially provided on the outer peripheral wall of the lower portion of the first sealing ring (24), and the upper end of the limiting pad (25) abuts against the top end of the first annular groove (26).

4. The solenoid valve for a thermal management system according to claim 1, characterized in that: A second groove (27) is provided at the bottom end of the piston (4), and a second sealing ring (28) is connected to the inside of the second groove (27). In an initial state, the bottom end of the second sealing ring (28) abuts against the bottom end of the inside of the valve seat (1) to block the first air port (12) and the second air port (13).

5. The solenoid valve for a thermal management system according to claim 1, characterized in that: The driving assembly (3) comprises a static iron core (31), a coil assembly (32) and a fifth spring (33); the coil assembly (32) is connected to the top of the valve seat (1); the static iron core (31) is connected to the coil assembly (32) and is located above the moving iron core (2); the fifth spring (33) is connected between the top of the moving iron core (2) and the bottom of the static iron core (31).

6. The solenoid valve for a thermal management system according to claim 5, characterized in that: The top end of the moving iron core (2) is provided with a first truncated cone portion (34), the bottom end of the stationary iron core (31) is provided with a first truncated cone groove (35), and the first truncated cone portion (34) is slidably connected in the first truncated cone groove (35).

7. The solenoid valve for a thermal management system according to claim 1, characterized in that: A first annular protrusion (36) is circumferentially provided on the outer peripheral wall of the first valve needle (5), and the first annular protrusion (36) is slidably matched with the first mounting cavity (19). A first through hole (37) is horizontally provided on the first annular protrusion (36), and the first spring (9) is abutted between the left end of the first annular protrusion (36) and the inner wall of the first mounting cavity (19). A second annular protrusion (38) is circumferentially provided on the outer peripheral wall of the second valve needle (6), and the second annular protrusion (38) is slidably matched with the second mounting cavity (20). A second through hole (39) is provided on the valve stem (38) in the vertical direction, the second spring (10) abuts between the top of the second annular protrusion (38) and the inner wall of the second mounting cavity (20), a third annular protrusion (40) is provided on the outer peripheral wall of the third valve needle (7) in the circumferential direction, the third annular protrusion (40) is slidably matched with the third mounting cavity (21), a third through hole (41) is provided on the third annular protrusion (40) in the vertical direction, and the third spring (11) abuts between the top of the third annular protrusion (40) and the inner wall of the third mounting cavity (21).

8. The solenoid valve for a thermal management system according to claim 1, characterized in that: The right end of the first valve needle (5), the left end of the first flow channel (16), the lower end of the second valve needle (6), the upper end of the second flow channel (17), the lower end of the third valve needle (7), the upper end of the third flow channel (18), the upper end of the fourth valve needle (8) and the lower end of the pressure relief hole (15) are all truncated cone-shaped.

9. The solenoid valve for a thermal management system according to claim 1, characterized in that: The fourth valve needle (8) is provided with a fourth flow channel (42) and a fifth flow channel (43), the fourth flow channel (42) penetrates the fourth valve needle (8) in the horizontal direction and is connected to the fourth mounting cavity (22), the fifth flow channel (43) is arranged in the vertical direction, the upper end of the fifth flow channel (43) is connected to the fourth flow channel (42), and the lower end of the fifth flow channel (43) is connected to the second air port (13).

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