Solenoid valve and automobile thermal management system comprising same
By introducing a second elastic element into the solenoid valve, the elastic coefficient requirement of the first elastic element is reduced, the problem of excessive electromagnetic force when the solenoid valve is energized is solved, and the size of the solenoid valve is reduced and its reliability is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-10
AI Technical Summary
Existing solenoid valves require a main return spring with a larger elastic coefficient when not energized, which results in a greater electromagnetic force required when energized, increasing the energy consumption and size of the solenoid valve.
The second elastic element is located inside the integral formed by the first and second moving valve cores, which reduces the elastic coefficient requirement of the first elastic element. The second elastic element provides the reset force, reducing the electromagnetic force requirement when the solenoid valve is energized.
This reduces the electromagnetic force required when the solenoid valve is energized, thus reducing the size of the solenoid valve and improving its reliability.
Smart Images
Figure CN224107748U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of solenoid valve and the automobile thermal management system comprising solenoid valve. BACKGROUND
[0002] Currently, solenoid valve includes valve sleeve, and main valve core and sub valve core received in valve sleeve. The head of main valve core is abutted to main reset spring, and the bottom of main valve core is abutted to sub reset spring. The bottom of main valve core is provided with receiving cavity, and a part of sub valve core is received in receiving cavity and another part of sub valve core passes through the head of main valve core, and sub valve core can move relative to main valve core. However, when solenoid valve is not powered, in order to realize the reset of main valve core, main reset spring needs to first resist the elastic force of sub reset spring extra, so that solenoid valve needs to use main reset spring with greater elastic coefficient. This leads to the electromagnetic force required when solenoid valve is powered is also greater, otherwise the elastic force of main reset spring cannot be resisted. SUMMARY
[0003] One object of the present application is to reduce the electromagnetic force required when solenoid valve and the automobile thermal management system comprising solenoid valve are powered.
[0004] A solenoid valve, comprising: a valve sleeve; a first movable valve core and a first elastic member abutting to the head of the first movable valve core and used for providing a reset force for the first movable valve core when the solenoid valve is not powered, which are arranged in sequence along an axial direction and can move axially in the valve sleeve; the head of the first movable valve core comprises a first receiving cavity extending along the axial direction; a second movable valve core arranged along the axial direction, the second movable valve core comprises a tail portion received in the first receiving cavity and can move axially within a limited range relative to the bottom of the first receiving cavity; and a second elastic member received in the first receiving cavity in a compressed state and abutting between the head of the first movable valve core and the tail portion of the second movable valve core to apply a force to the second movable valve core away from the bottom of the first receiving cavity.
[0005] The solenoid valve can present one or more of the following features, alone or in combination.
[0006] In some embodiments, the head of the first movable valve core further comprises a bent portion extending inwardly at the first receiving cavity, and the bent portion comprises a first limiting portion formed by the inner side of the bent portion and in contact with the tail portion of the second movable valve core and used for defining the maximum distance of the tail portion of the second movable valve core away from the bottom of the first receiving cavity.
[0007] In some embodiments, the head of the first moving spool further comprises a ring-shaped bending part formed by inwardly folding the annular edge of the first moving spool at the opening of the first accommodating cavity, the bending part comprises a first limiting part formed by the inner wall of the bending part, which is in contact with the tail of the second moving spool and is used to limit the maximum distance of the tail of the second moving spool from the bottom of the first accommodating cavity.
[0008] In some embodiments, the second moving spool further comprises a rod body extending axially from the tail, the diameter of the tail is greater than the diameter of the rod body, so that the tail comprises a shoulder at the connection with the rod body, and the first limiting part is in contact with the shoulder of the tail.
[0009] In some embodiments, the electromagnetic valve further comprises a static core fixed to the valve sleeve, the first moving spool, the first elastic member, and the static core are sequentially arranged along the axial direction; the bending part further comprises a second limiting part formed by the outer side of the bending part, which is used to cooperate with the static core to limit the maximum range of movement of the first moving spool to the static core.
[0010] In some embodiments, one end of the second elastic member abuts against the bottom or wall of the first accommodating cavity, and the other end abuts against the tail of the second moving spool.
[0011] In some embodiments, the tail of the second moving spool comprises a second accommodating cavity extending axially and accommodating one end of the second elastic member, and the opening of the second accommodating cavity is directed towards the inside of the first accommodating cavity.
[0012] In some embodiments, the electromagnetic valve further comprises a static core fixed to the valve sleeve and through which the second moving spool passes, the first moving spool, the first elastic member, and the static core are sequentially arranged along the axial direction, the first elastic member is located outside the first accommodating cavity, and the two ends of the first elastic member abut against the tail of the static core and the head of the first moving spool, respectively.
[0013] In some embodiments, the electromagnetic valve further comprises a plug and a switch piston which are integrally pressed into the first end of the rod body of the second moving spool or are fixed to the first end of the rod body of the second moving spool in a cladding manner, and the plug comprises a flat pressing surface used to drive the switch piston.
[0014] In some embodiments, the switch piston is provided with a balance channel penetrating through the switch piston along the axial direction, and the plug is used to block the balance channel through the flat pressing surface.
[0015] The utility model also provides a kind of automobile thermal management system, and automobile thermal management system includes above-mentioned electromagnetic valve.
[0016] The second elastic member is located inside the whole formed by the first moving valve core and the second moving valve core, the second elastic member does not resist the first elastic member, the requirement of the elastic coefficient of the electromagnetic valve to the first elastic member can be reduced, and thus the requirement of the electromagnetic force of the electromagnetic valve when energized can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] To further disclose the technical contents of the present case, first refer to the drawings, wherein:
[0018] Figure 1 is a perspective view of the angle of the electromagnetic valve provided by an embodiment of the present utility model;
[0019] Figure 2 is another perspective view of the angle of the electromagnetic valve provided by an embodiment of the present utility model;
[0020] Figure 3 is Figure 1 a plan view of the electromagnetic valve shown;
[0021] Figure 4 is Figure 3 an A-A cross-sectional view of the electromagnetic valve shown;
[0022] Figure 5 is Figure 4 an enlarged view of B part;
[0023] Figure 6 is similar to Figure 4 , but shows another state of the electromagnetic valve;
[0024] Figure 7 is a perspective view of the electromagnetic valve provided by another embodiment of the present utility model;
[0025] Figure 8 is Figure 7 a cross-sectional view of the electromagnetic valve shown. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present utility model will be described below in combination with the drawings of the present utility model.
[0027] Referring to Figure 1 , the electromagnetic valve 50 provided by an embodiment of the present utility model includes an electromagnetic assembly 51 for generating a magnetic field, a connector 53 for supplying power to the electromagnetic assembly 51, and a U-shaped bracket 55 connected to both ends of the electromagnetic assembly 51, etc. One end of the U-shaped bracket 55 is provided with a mounting hole 57, and the mounting hole 57 is used for connecting the electromagnetic valve 50 with the outside.
[0028] Referring to Figure 1 and Figure 2The solenoid valve 50 further comprises a static core 33. The static core 33 is mounted at one end of the solenoid valve 50. The stem of a moving core of the solenoid valve 50 extends outwardly through the static core 33.
[0029] Reference is made to Figures 3 to 5 The electromagnetic assembly 51 comprises an insulating frame 51a, a coil 51b mounted to the insulating frame 51a, and a protective shell 51c covering the outer periphery of the insulating frame 51a and the coil 51b. A connector 53 is fixedly connected to the protective shell 51c, and a terminal 54 is mounted in the connector 53 and electrically connected to the coil 51b. In the present embodiment, the terminal 54 is electrically connected to the coil 51b through a diode 53b, which is used to prevent counter electromotive force.
[0030] The insulating frame 51a has a through hole in the middle portion. The solenoid valve 50 further comprises a valve sleeve 5, a first moving core 10, a first elastic member 15, a second moving core 20, and a second elastic member 25. The valve sleeve 5 is mounted to the through hole in the middle portion of the insulating frame 51a. The valve sleeve 5 comprises an open end. The tail portion of the static core 33 is fixed in the open end of the valve sleeve 5, i.e. the static core 33 is fixed to the valve sleeve 5. In the present embodiment, the tail portion of the static core 33 is welded to the open end of the valve sleeve 5. The first moving core 10 and the first elastic member 15 are arranged in sequence along the axial direction. The first moving core 10 is mounted in the valve sleeve 5 and can reciprocate axially in the valve sleeve 5, and the head portion of the first moving core 10 comprises a first receiving cavity 12 extending along the axial direction. The first elastic member 15 abuts against the head portion of the first moving core 10. In the present embodiment, the first moving core 10, the first elastic member 15, and the static core 33 are arranged in sequence along the axial direction. The first elastic member 15 is located outside the first receiving cavity 12. The first elastic member 15 is used to provide a restoring force for the first moving core 10 when the solenoid valve 50 is not powered on, so as to reset the first moving core 10 when the solenoid valve 50 is powered off. The first elastic member 15 abuts against the tail portion of the static core 33 and the head portion of the first moving core 10 at two ends, respectively. Thus, when the solenoid valve 50 is powered on, the first moving core 10 needs to overcome the restoring force of the first elastic member 15 first, and then move axially towards the static core 33.
[0031] The second moving valve core 20 is arranged in the axial direction. The second moving valve core 20 is partially accommodated in the first accommodating cavity 12 and can move in the axial direction within a limited range relative to the bottom of the first accommodating cavity 12. Specifically, the second moving valve core 20 includes a tail portion 21 and a stem 23 extending in the axial direction from the tail portion 21, and the tail portion 21 is accommodated in the first accommodating cavity 12 and can move in the axial direction within a limited range relative to the bottom of the first accommodating cavity 12. The stem 23 of the second moving valve core 20 extends outwardly through the static iron core 33. The second elastic member 25 is accommodated in the first accommodating cavity 12 in the axial direction and is in a compressed state abutting between the head portion of the first moving valve core 10 and the tail portion 21 of the second moving valve core 20 to apply a force to the second moving valve core 20 away from the bottom of the first accommodating cavity 12. Specifically, one end of the second elastic member 25 abuts against the bottom or wall of the first accommodating cavity 12, and the other end abuts against the tail portion 21 of the second moving valve core 20, so that the second moving valve core 20 is subjected to a force away from the bottom of the first accommodating cavity 12. The electromagnetic valve further includes a plug 24 fixed to the head end of the stem 23 in a tight fit or cladding manner, for example, the plug 24 is pressed into the head end of the stem 23 in the axial direction and is integrally or claddingly fixed. It can be understood that the head end of the stem 23 can also be provided with the plug 24 in a screw connection manner, which is not limited in the present application. In the embodiment, the plug 24 includes a flat pressing surface, and the plug 24 is used to drive a driven component, such as a piston switch, through the flat pressing surface.
[0032] In the present application, when the first moving valve core 10 and the second moving valve core 20 are observed as a whole, the second elastic member 25 is located inside the whole, and the restoring force of the first elastic member 15 is not opposed by the second elastic member 25, so that the restoring force provided by the first elastic member 15 can be smaller than the force provided by the second elastic member 25, which reduces the requirement of the elastic coefficient of the first elastic member 15 by the electromagnetic valve 50, so that the electromagnetic force required to overcome the restoring force of the first elastic member 15 when the electromagnetic valve 50 needs to drive the first moving valve core 10 is smaller, so that the electromagnetic force required when the electromagnetic valve 50 is energized is also smaller, thereby reducing the size of the electromagnetic valve 50 and improving the reliability of the electromagnetic valve 50.
[0033] In the present embodiment, the head of the first spool 10 further comprises a bent portion extending inwardly at the opening of the first accommodating cavity 12. The bent portion comprises a first limiting portion 13 formed by the inner side of the bent portion. The first limiting portion 13 is in contact with the tail 21 of the second spool 20. The first limiting portion 13 is used to limit the movement range of the tail 21 of the second spool 20 relative to the bottom of the first accommodating cavity 12. Specifically, the bent portion extends inwardly from the head of the first spool 10 at the opening of the first accommodating cavity 12. In the present embodiment, the bent portion extends relatively inwardly from the head of the first spool 10 at the opening of the first accommodating cavity 12. Each first limiting portion 13 is used to limit the maximum distance of the tail 21 of the second spool 20 away from the bottom of the first accommodating cavity 12. In the present embodiment, the bent portion comprises a free end. When the solenoid valve 50 is not energized, the tail 21 of the second spool 20 is subjected to a force away from the bottom of the first accommodating cavity 12 under the action of the second elastic member 25, so that the tail 21 of the second spool 20 presses against the first limiting portion 13, making the first limiting portion 13 in contact with the tail 21 of the second spool 20. In the present embodiment, the diameter of the tail 21 is greater than the diameter of the stem 23, so that the tail 21 comprises a shoulder at the connection between the tail 21 and the stem 23, and the first limiting portion 13 is in contact with the shoulder of the tail 21.
[0034] In an alternative, the first limiting portion 13 is in the form of a ring body with reduced inner diameter, formed by the inwardly folded annular edge of the first spool 10 at the opening of the first accommodating cavity 12. Specifically, the head of the first spool 10 further comprises a ring-shaped bent portion formed by the inwardly folded annular edge of the first spool 10 at the opening of the first accommodating cavity 12, and the bent portion comprises a first limiting portion 13 formed by the inner wall of the bent portion, which is in contact with the tail of the second spool 20 and is used to limit the maximum distance of the tail 21 of the second spool 20 away from the bottom of the first accommodating cavity 12. In this form, the first limiting portion 13 is more rigid. It can be understood that the ring-shaped bent portion can also be a ring body with both outer diameter and inner diameter reduced, which is not limited in the present application.
[0035] When the first spool 10 is reset under the reset force of the first elastic member 15, i.e. the first spool 10 moves axially away from the static core 33, the first limiting portion 13 drives the second spool 20 to move in the same direction as the first spool 10, so that the second spool 20 is reset, and at this time, the first spool 10 is also reset. As described above, when the first spool 10 and the second spool 20 are observed as a whole, the second elastic member 25 is inside the whole, and the reset force of the first elastic member 15 is not resisted by the second elastic member 25, thereby reducing the requirement of the electromagnetic valve 50 on the elastic coefficient of the first elastic member 15. Preferably, the second elastic member 25 is compressed when the electromagnetic valve 50 is powered on and powered off, so that the tail portion 21 keeps in contact with the first limiting portion 13, and only the pressure between the tail portion 21 and the first limiting portion 13 can change with the power on or off of the electromagnetic valve 50 (or the change of the position of the first spool 10).
[0036] By reference to Figure 4 and Figure 6 , when the electromagnetic valve 50 is powered on, the state shown in Figure 4 is switched to the state shown in Figure 6 . When the electromagnetic valve 50 is powered on, the first spool 10 needs to overcome the reset force of the first elastic member 15 before moving axially relative to the valve sleeve 5. At this time, since the electromagnetic valve 50 has reduced the requirement on the elastic coefficient of the first elastic member 15, the electromagnetic valve 50 needs a smaller electromagnetic force to drive the first spool 10 to move axially relative to the valve sleeve 5, more specifically, to move axially towards the static core 33. In this process, the bottom or wall of the first accommodating cavity 12 drives the second spool 20 to move in the same direction by the second elastic member 25, i.e. drives the rod body 23 of the second spool 20 to extend outward. When the second spool 20 is resisted by an external force, for example, by a piston switch, as long as the length of the second elastic member 25 is not further compressed, the elastic force of the second elastic member 25 resisting the first spool 20 will not change, and the electromagnetic valve 50 can continue to drive the rod body 23 of the second spool 20 to extend outward. It can be understood that when the second spool 20 is resisted by an external force, the length of the second elastic member 25 can also be slightly further compressed, as long as the electromagnetic force acting on the first spool 10 can overcome the elastic force caused by the change in the length of the second elastic member 25, the first spool 10 can be moved to or stabilized at the desired position, and the application does not limit the size of the external resistance force received by the second spool 20.
[0037] By reference to Figure 5In the embodiment, the tail portion 21 of the second valve element 20 is provided with a second accommodating cavity 22 extending in the axial direction, and the opening of the second accommodating cavity 22 faces the interior of the first accommodating cavity 12; and the second elastic member 25 is partially accommodated in the second accommodating cavity 22, so that the installation of the second elastic member 25 is more stable. In the embodiment, the second accommodating cavity 22 accommodates one end of the second elastic member 25.
[0038] The head portion of the first valve element 10 further comprises a second limiting portion 14. The second limiting portion 14 is formed by the outer side of the bending portion. The second limiting portion 14 is used to cooperate with the static iron core 33 to limit the maximum range of movement of the first valve element 10 towards the static iron core 33. Preferably, the number of the second limiting portion 14 is the same as that of the first limiting portion 13.
[0039] Reference Figure 7 And Figure 8 In another embodiment of the utility model, the electromagnetic valve further comprises a piston assembly, which comprises a piston sleeve 60, a switch piston 63 and a third elastic member 65. The head portion of the static iron core 33 is installed in the piston sleeve 60. It can be understood that the static iron core 33 can also have other structures, for example, the electromagnetic valve 50 can further comprise a valve cover, the tail portion of the static iron core 33 is fixed in the opening end of the valve sleeve 5 by welding or other methods, the head portion of the static iron core 33 is fixed with the valve cover by welding or other methods, and the valve cover is installed in the piston sleeve 60, which is not limited in the application.
[0040] The switch piston 63 can reciprocate in the piston sleeve 60 in the axial direction. In the embodiment, a dynamic O-shaped ring 66 is arranged between the switch piston 63 and the piston sleeve 60, and the dynamic O-shaped ring 66 is used to realize the sealing between the switch piston 63 and the piston sleeve 60. The switch piston 63 is used to be driven by the second valve element 20 of the electromagnetic valve to move between the opening position and the blocking position. In the embodiment, the switch piston 63 comprises a sealing member 63b, which is used to seal the axial gap between the switch piston 63 and the piston sleeve 60. It can be understood that when the sealing member 63b seals the axial gap between the switch piston 63 and the piston sleeve 60, the switch piston 63 is in the blocking position. The third elastic member 65 extends in the axial direction and is accommodated in the piston sleeve 60. The opposite ends of the third elastic member 65 abut against the piston sleeve 60 and the switch piston 63 respectively, and are used to exert an elastic force on the switch piston 63 to reset the switch piston 63 when not powered, and to keep the switch piston 63 in contact with the second valve element 20 in the powered state of the electromagnetic valve.
[0041] The opening and closing of the electromagnetic valve are described in detail as follows:
[0042] When the solenoid valve is energized, the first movable valve core 10 moves towards the static core 33, drives the rod body 23 of the second movable valve core 20 to extend away from the valve sleeve 5, and makes the plug 24 at the first end of the rod body 23 abut and push the switch piston 63 to compress the third elastic member 65, until the second limiting portion 14 of the first movable valve core 10 abuts against the static core 33, at this time, the third elastic member 65 exerts a spring force on the switch piston 63 to keep the switch piston 63 in contact with the plug 24 of the second movable valve core 20, and the switch piston 63 is in a blocking position, and the solenoid valve is in a closed state.
[0043] When the solenoid valve is de-energized, the first movable valve core 10 moves axially away from the static core 33 under the action of the first elastic member 15, the first limiting portion 13 abuts against the second movable valve core 20 to drive the second movable valve core 20 to move in the same direction, so that the rod body 23 moves towards the valve sleeve 5 and retracts until the first movable valve core 10 is reset. At this time, the tail portion 21 of the second movable valve core 20 is subjected to a force away from the bottom of the first accommodating cavity 12 under the action of the second elastic member 25, so that the tail portion 21 of the second movable valve core 20 abuts against the first limiting portion 13. At the same time, under the action of the third elastic member 65, the switch piston 63 is reset and is in an open position, and the solenoid valve is in an open state.
[0044] It can be understood that if the distance of the retraction of the rod body 23 is greater than the distance of the reset of the switch piston 63, the plug 24 of the second movable valve core 20 is separated from the switch piston 63 and no longer keeps contact with the switch piston 63, and vice versa.
[0045] In the embodiment, as shown in the figure, Figure 8 To prevent the high-pressure fluid from pushing the switch piston 63 upwards and causing the switch piston 63 to fail to be stably positioned at the desired position, the switch piston 63 is further provided with a balance passage 64 penetrating through the switch piston 63 in the axial direction. When the fluid pressure below the switch piston 63 is too high, the fluid can impact the plug 24 upwards through the balance passage 64, so that the plug 24 temporarily or periodically fails to block the balance passage 64, allowing the fluid to enter the buffer interval 35 between the static core 33 and the switch piston 63 through the balance passage 64. When the fluid enters the buffer interval 35, especially fills the buffer interval 35, at this time, the switch piston 63 is subjected to the pressure of the fluid at both axial ends, and the switch piston 63 can reach a balanced or nearly balanced state, so that the switch piston 63 can be stably positioned at the expected position. Since the plug 24 comprises a flat pressing surface, when the flat pressing surface drives the switch piston 63 and blocks the balance passage 64, the flat pressing surface is beneficial to blocking the balance passage 64 and improving the sealing performance of the solenoid valve, and can also prevent the plug 24 from being embedded in the switch piston 63 when blocking the balance passage 64.
[0046] The utility model discloses another embodiment further provides a kind of automobile thermal management system. Automobile thermal management system includes above-mentioned solenoid valve.
[0047] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. An electromagnetic valve comprising a valve housing (5), characterized in that The electromagnetic valve comprises: a first spool (10) axially reciprocating in the valve sleeve (5) and a first elastic member (15) abutting to the head of the first spool (10) and used for providing a restoring force for the first spool (10) when the electromagnetic valve is not energized, the head of the first spool (10) comprising a first accommodating cavity (12) extending in the axial direction; a second spool (20) arranged in the axial direction, the second spool (20) comprising a tail (21) accommodated in the first accommodating cavity (12) and capable of axially moving within a limited range relative to the bottom of the first accommodating cavity (12); and a second elastic member (25) axially accommodated in the first accommodating cavity (12) and abutting between the head of the first spool (10) and the tail (21) of the second spool (20) to apply a force to the second spool (20) away from the bottom of the first accommodating cavity (12) in a compressed state.
2. The electromagnetic valve of claim 1, wherein: the head of the first spool (10) further comprises a bent portion extending inwardly at the first accommodating cavity (12), the bent portion comprising a first limiting portion (13) formed by the inner side of the bent portion and used for contacting the tail of the second spool (20) and limiting the maximum distance of the tail (21) of the second spool (20) away from the bottom of the first accommodating cavity (12); or the head of the first spool (10) further comprises a ring-shaped bent portion formed by inwardly folding the annular edge of the first spool (10) at the opening of the first accommodating cavity (12), the bent portion comprising a first limiting portion (13) formed by the inner wall of the bent portion and used for contacting the tail of the second spool (20) and limiting the maximum distance of the tail (21) of the second spool (20) away from the bottom of the first accommodating cavity (12).
3. The electromagnetic valve according to claim 2, wherein The second spool (20) further comprises a rod body (23) extending axially from the tail (21), the diameter of the tail (21) being greater than the diameter of the rod body (23) so that the tail (21) comprises a shoulder at the connection with the rod body (23), and the first limiting portion (13) contacts the shoulder of the tail (21).
4. The electromagnetic valve according to claim 2, wherein The electromagnetic valve further comprises a static core (33) fixed to the valve sleeve (5), the first spool (10), the first elastic member (15), and the static core (33) being arranged in the axial direction in sequence; the bent portion further comprises a second limiting portion (14) formed by the outer side of the bent portion and used for cooperating with the static core (33) to limit the maximum range of movement of the first spool (10) toward the static core (33).
5. The electromagnetic valve according to claim 1, wherein One end of the second elastic member (25) abuts to the bottom or wall of the first accommodating cavity (12), and the other end abuts to the tail of the second spool (20).
6. The electromagnetic valve according to claim 1, wherein The tail of the second moving valve core (20) comprises a second accommodating cavity (22) extending in the axial direction and accommodating one end of the second elastic member (25), and the opening of the second accommodating cavity (22) faces the inside of the first accommodating cavity (12).
7. The electromagnetic valve according to claim 1, wherein The electromagnetic valve further comprises a static iron core (33) fixed to the valve sleeve (5) and through which the second moving valve core (20) passes, the first moving valve core (10), the first elastic member (15), and the static iron core (33) are sequentially arranged in the axial direction, the first elastic member (15) is located outside the first accommodating cavity (12), and the two ends of the first elastic member (15) abut against the tail of the static iron core (33) and the head of the first moving valve core (10) respectively.
8. The electromagnetic valve according to claim 1, wherein The electromagnetic valve further comprises a plug (24) and a switch piston (63) which are integrally pressed in the axial direction or fixedly covered at the head end of the rod body (23) of the second moving valve core (20), the plug (24) comprises a flat pressing surface for driving the switch piston (63).
9. The electromagnetic valve according to claim 8, wherein The switch piston (63) is provided with a balance channel (64) penetrating through the switch piston (63) in the axial direction, and the plug (24) is used for blocking the balance channel (64) through the flat pressing surface.
10. An automotive thermal management system characterized by: The automobile thermal management system comprises the electromagnetic valve according to any one of claims 1 to 9.