Electric valve and automobile thermal management system

Abstract

The invention provides an electric valve and an automobile thermal management system. The electric valve comprises a driving part, a valve body, a lead screw, a first valve element, a second valve element, a first elastic piece and a second elastic piece. The lead screw drives the first valve element and the second valve element to do vertical linear motion to be matched with the first valve port and the second valve port, and proportional adjustment and runner switching are achieved. The first elastic piece and the second elastic piece are arranged on the inner side and the outer side of the first valve element correspondingly, pre-tightening force is provided for closing the first valve port and the second valve port correspondingly, the valve element and the valve ports are tightly attached after flow channels are switched, it is guaranteed that the electric valve can overcome thread gaps under the power failure condition, the flow channel on-off mode can still be maintained, and the service life of the electric valve is prolonged. And the electric valve can operate stably.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and in particular to an electric valve and an automotive thermal management system. Background Technology

[0002] In refrigeration cycle systems, multi-way valves are often used as core components for regulating refrigerant flow paths. Linear module-driven electric valves include a drive component, a nut, a lead screw, and a valve core component. The lead screw and nut are threaded together. The drive component rotates the nut, causing the lead screw to move the valve core component axially to seal or open the valve port. When the drive component stops rotating, the threaded clearance between the nut assembly and the lead screw leads to poor sealing between the valve core and the valve port, resulting in reduced flow control accuracy of the electric valve. Therefore, it is necessary to provide an electric valve and an automotive thermal management system to overcome the aforementioned defects. Summary of the Invention

[0003] The purpose of this invention is to provide an electric valve and an automotive thermal management system.

[0004] According to one aspect of the present invention, an electric valve and an automotive thermal management system are provided, comprising: The drive component includes a nut assembly; Valve body, with a valve cavity formed inside the valve body; A first interface is provided on the valve body and is connected to the valve cavity; The second interface is located on the valve body and communicates with the valve cavity. In the axial direction of the valve body, the second interface is located below the first interface. A first valve port is positioned circumferentially between the first interface and the second interface of the valve cavity. A lead screw is disposed in the valve cavity and threadedly engaged with the nut assembly. Under the drive of the driving component, the lead screw can move up and down along the axial direction of the valve body. The first boss portion is fixedly mounted on the lead screw; A limiting part is fixed to the end of the lead screw away from the driving component; A first valve core is sleeved on the lead screw and positioned between the first boss portion and the limiting portion, and the first valve core is movable relative to the lead screw. The second valve core is placed inside the valve cavity. A first channel and a second channel are provided inside the second valve core. The first channel is located at the upper part of the second valve core, and the first valve core is placed inside the first channel. The second channel is located at the lower part of the second valve core. The outer diameter of the limiting part is smaller than the inner diameter of the second channel and can move into the second channel. The outer diameter of the first valve core is larger than the inner diameter of the second channel. The first sealing part is disposed on the outer surface of the second valve core and can abut against the first valve port to form a sealing surface; The first elastic element is disposed between the first valve core and the first boss portion; When the lead screw moves downward to the point where the first sealing part abuts against the first valve port, the lead screw continues to move downward to continuously compress the first elastic element, and the first elastic element pushes the second valve core downward or keeps the second valve core with a downward tendency.

[0005] Preferably, it further includes: The third interface is located on the valve body and communicates with the valve cavity, and the third interface is positioned above the first interface in the axial direction of the valve body. The second valve port is positioned circumferentially between the first interface and the third interface along the valve cavity; The second sealing part is disposed on the outer surface of the second valve core and can abut against the second valve port to form a sealing surface. The second boss portion is located on the upper part of the second valve core and protrudes towards the lead screw side; The second elastic element is disposed between the first valve core and the second boss portion; When the lead screw moves upward to the point where the second sealing part abuts against the second valve port, the lead screw continues to move upward to continuously compress the second elastic element, and the second elastic element pushes the second valve core upward or keeps the second valve core with an upward tendency.

[0006] Preferably, the driving component includes: Stator assembly; A rotor assembly, comprising a rotor component sleeved inside the stator assembly and a connecting component that rotates integrally with the rotor component, the rotor assembly being capable of rotating in the excitation magnetic field generated by the stator assembly; A nut assembly, comprising a plastic nut that rotates integrally with the connector, wherein the threaded portion of the lead screw is fitted inside the plastic nut and threadedly engages with the nut assembly.

[0007] Preferably, the rotor component and the connecting component are integrally molded into a rotor assembly by injection molding, and the rotor assembly is fixedly connected to the plastic nut by injection molding.

[0008] Preferably, the first valve core includes a base portion sleeved on the lead screw and a sleeve portion disposed on the base portion, the base portion and the sleeve portion being an integral structure, the first elastic element being located inside the sleeve portion, and the second elastic element being located outside the sleeve portion.

[0009] Preferably, the valve cavity is further provided with a limiting plate, the outer side of the limiting plate is fixedly connected to the valve body, and the limiting plate is provided with a through hole, through which the lead screw assembly passes.

[0010] Preferably, the second valve core further includes: A sealing section is formed on the outer side of the second valve core, and the outer wall of the sealing section is attached to the inner wall of the valve cavity and can move along the valve cavity; A flow channel section is provided below the sealing section, and the outer diameter of the flow channel is smaller than the inner diameter of the valve cavity; The second sealing part is located at the lower part of the flow channel section, and the outer diameter of the second sealing part is larger than the inner diameter of the first valve port and smaller than the inner diameter of the valve cavity between the first valve port and the second valve port. A first sealing part is located below the second sealing part and at a predetermined distance from the second sealing part. The outer diameter of the first sealing part is larger than the inner diameter of the first valve port and smaller than the inner diameter of the valve cavity between the first valve port and the second valve port.

[0011] Preferably, the first valve port is a sealing ring made of PTFE material, and the second valve port is a sealing ring made of PTFE material. The first valve port and the second valve port have the same structure and are distributed in a mirror image on the upper and lower sides of the first interface.

[0012] Preferably, the first valve port includes a fixing part and a sealing part. The fixing part is press-fitted into the groove of the valve body, and the sealing part is an annular boss with an inclined surface, the annular boss facing the first sealing part.

[0013] According to another aspect of the present invention, an automotive thermal management system is provided, including the aforementioned electric valve.

[0014] Compared with existing technologies, the electric valve and automotive thermal management system provided by this invention have the following advantages: This invention uses a lead screw to drive the first and second valve cores in linear motion, cooperating with the first and second valve ports to achieve proportional adjustment and flow channel switching. Furthermore, by providing a first elastic element and a second elastic element on the inner and outer sides of the first valve core, pre-tightening forces are provided for closing the first and second valve ports respectively, ensuring a tight fit between the valve core and valve port after flow channel switching. This guarantees that even in the event of a power outage, the electric valve can overcome thread clearance and maintain the flow channel on / off mode, enabling stable operation of the electric valve. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the electric valve in this invention; Figure 2 This is a bottom view schematic diagram of the electric valve in this invention; Figure 3 This is a cross-sectional schematic diagram of the electric valve in the present invention when the valve core has just entered the first state; Figure 4 In this invention ( Figure 3 A magnified view of a portion of region A in the middle; Figure 5 This is a cross-sectional schematic diagram of the electric valve in the present invention when the valve core is in the first state; Figure 6 For the valve cavity in this invention ( Figure 5 A magnified view of a portion of region B in the middle; Figure 7 This is a cross-sectional schematic diagram of the electric valve in this invention when the valve core has just entered the second state; Figure 8 For the valve cavity in this invention ( Figure 7 A magnified view of a portion of region C in the middle; Figure 9 This is a cross-sectional schematic diagram of the electric valve in this invention when the valve core has just entered the second state; Figure 10 For the valve cavity in this invention ( Figure 9 A magnified view of a portion of region D.

[0016] Explanation of reference numerals in the attached figures: 1. Drive components; 11. Stator assembly; 12. Rotor assembly; 121. Rotor components; 122. Connecting components; 123. Bearings; 13. Nut assembly; 131. Plastic nuts; 2. Valve body; 21. Valve cavity; 22. First interface; 23. Second interface; 24. Third interface; 25. First valve port; 26. Second valve port; 251. Fixing part; 252. Sealing part; 3. Lead screw; 31. First boss portion; 32. Limiting portion; 33. Threaded portion; 4. First valve core; 41. Base portion; 42. Sleeve portion; 5. Second valve core; 51. First channel; 52. Second channel; 53. Sealing section; 54. Flow channel section; 55. Second sealing part; 56. First sealing part; 57. Second boss part; 6. First elastic element; 7. Second elastic element; 8. Limiting plate; 81. Through hole. Detailed Implementation

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0019] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0020] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0023] See Figures 1 to 10 This embodiment provides an electric valve, particularly an electric three-way valve, which includes a drive component 1, a valve body 2, a lead screw 3, a first valve core 4, a second valve core 5, a first elastic element 6, and a second elastic element 7.

[0024] The drive component 1 is fixedly connected to the valve body 2, forming a valve cavity 21 inside the valve body 2. The valve body 2 is provided with a first interface 22, a second interface 23, and a third interface 24. The first interface 22, the second interface 23, and the third interface 24 are spaced apart in the axial direction by a predetermined distance and are respectively connected to the valve cavity 21. In the axial direction of the valve body 2, the second interface 23 is located below the first interface 22. In this embodiment, the second interface 23 is located on the bottom surface of the valve body 2. In the axial direction of the valve body 2, the third interface 24 is located above the first interface 22.

[0025] The first valve port 25 is positioned between the first interface 22 and the second interface 23 along the circumference of the valve cavity 21, and the second valve port 26 is positioned between the first interface 22 and the third interface 24 along the circumference of the valve cavity 21. This means that the first valve port 25 is located at the lower end of the second valve port 26, and the first sealing part 56 and the second sealing part 55 of the second valve core 5 move between the first valve port 25 and the second valve port 26 to achieve the switching of the flow channel.

[0026] On one hand, the first valve port 25 is a sealing ring made of PTFE material, and the second valve port 26 is a sealing ring made of PTFE material. The first valve port 25 and the second valve port 26 have the same structure and are distributed in a mirror image on the upper and lower sides of the first interface 22. By changing the traditional metal-to-metal hard seal of the electric valve to a soft seal of PTFE and metal, the sealing performance of the electric valve can be improved.

[0027] On the other hand, the first valve port 25 includes a fixing part 251 and a sealing part 252. The fixing part 251 is press-fitted into the groove of the valve body 2, and the sealing part 252 is an annular boss with an inclined surface, the annular boss facing the first sealing part 56. By fitting the PTFE ring into the metal groove, when the valve is closed, the PTFE sealing ring and the metal valve core form a sealing structure. This achieves a soft seal with superior sealing performance and ensures that the PTFE sealing ring is not easily deformed, effectively improving the product's durability.

[0028] The driving component 1 includes a stator assembly 11, a rotor assembly 12, and a nut assembly 13. The stator assembly 11 includes a coil assembly, which generates an excitation magnetic field when the stator assembly 11 is energized. The rotor assembly 12 includes a rotor component 121 sleeved inside the stator assembly 11, a connecting component 122 rotating integrally with the rotor component 121, and a bearing 123 disposed between the connecting component 122 and the valve body 2. The rotor component 121 and the connecting component 122 can rotate in the excitation magnetic field generated by the stator assembly 11. The nut assembly 13 includes a plastic nut 131 rotating integrally with the connecting component 122. The threaded portion 33 of the lead screw 3 is sleeved inside the plastic nut 131 and threadedly engaged with the nut assembly 13.

[0029] The lead screw 3 is located inside the valve cavity 21 and is threadedly engaged with the nut assembly 13, converting the rotational motion of the rotor assembly 12 into the linear motion of the lead screw 3. Under the drive of the drive component 1, the lead screw 3 can move up and down along the axial direction of the valve body 2, thereby driving the axial movement of the first valve core 4 and the second valve core 5.

[0030] See appendix Figure 3 , 4 A first boss 31 is provided in the middle region of the lead screw 3, and a limiting part 32 is provided at the end of the lead screw 3 away from the driving component 1. The first valve core 4 is sleeved on the lead screw 3 and placed between the first boss 31 and the limiting part 32. The first valve core 4 can move relative to the lead screw 3, and the first boss 31 and the limiting part 32 can play a limiting role.

[0031] The first valve core 4 includes a base portion 41 sleeved on the lead screw 3 and a sleeve portion 42 disposed on the base portion 41. The base portion 41 and the sleeve portion 42 are integral structures. The first elastic member 6 is located inside the sleeve portion 42, and the second elastic member 7 is located outside the sleeve portion 42.

[0032] The second valve core 5 is placed inside the valve cavity 21. A first channel 51 and a second channel 52 are provided inside the second valve core 5. The first channel 51 is located at the upper part of the second valve core 5. The first valve core 4 is placed in the first channel 51. The second channel 52 is located at the lower part of the second valve core 5. The outer diameter of the limiting part 32 is smaller than the inner diameter of the second channel 52 and can move into the second channel 52. The outer diameter of the first valve core 4 is larger than the inner diameter of the second channel 52. The second channel 52 can allow the limiting part 32 to pass through and can block the first valve core 4 from passing through.

[0033] The second valve core 5 has a sealing section 53, a flow channel section 54, a second sealing part 55, and a first sealing part 56 formed on its exterior. The sealing section 53 is formed on the outer side of the second valve core 5. The outer wall of the sealing section 53 is attached to the inner wall of the valve cavity 21 and can move along the valve cavity 21. A sealing ring is provided on the outer peripheral surface of the sealing section 53. The sealing ring divides the valve cavity 21 into a flow channel area located in the lower part of the valve cavity 1 and a control area located in the upper part of the valve cavity 1. The flow channel area controls the flow direction of the valve body 2, and the control area can accommodate the first valve core 4, the first elastic element 6, and the second elastic element 7.

[0034] The flow channel section 54 is located at the lower part of the sealing section 53. The outer diameter of at least a portion of the flow channel section 54 is smaller than the inner diameter of the valve cavity 21. The flow channel area formed by the flow channel section 54 can connect the first interface 22 and the second interface 23, the first interface 22 and the third interface 24, thereby realizing the switching of the electric valve flow channel.

[0035] In this embodiment, the flow channel section 54 is recessed from the lower part of the sealing section 53 toward the center line of the valve body 2 to form a first conical surface. The first conical surface extends downward along the lower part of the first conical surface to form a cylindrical surface. The cylindrical surface extends downward along the lower part of the cylindrical surface and protrudes toward the inner wall of the valve cavity 21 to form a second conical surface. The driving component 1 controls the position of the second valve core 5 through the lead screw 3, thereby controlling the distance between the first conical surface and the second interface 23 and the distance between the second conical surface and the first interface 22, so as to realize the proportional adjustment of the flow rate.

[0036] The second sealing part 55 is disposed on the outer surface of the second valve core 5 and can abut against the second valve port 26 to form a sealing surface. The second sealing part 55 is conical, and the contact portion of the second valve port 26 has a vertical cut edge. Specifically, the second sealing part 55 is located at the lower part of the flow channel section 54, that is, the lower part of the second conical surface, and the outer diameter of the second sealing part 55 is larger than the inner diameter of the first valve port 25 and smaller than the inner diameter of the valve cavity 21 between the first valve port 25 and the second valve port 26. When the second sealing part 55 abuts against the second valve port 26, it restricts the further movement of the lead screw 3 and the second sealing part 55. When the second sealing part 55 does not abut against the second valve port 26, the first interface 22 and the second interface 23 are connected.

[0037] The first sealing part 56 is disposed on the outer surface of the second valve core 5 and can abut against the first valve port 25 to form a sealing surface. Specifically, the first sealing part 56 is located below the second sealing part 55 and is a predetermined distance away from the second sealing part 55. The outer diameter of the first sealing part 56 is larger than the inner diameter of the first valve port 25 and smaller than the inner diameter of the valve cavity 21 between the first valve port 25 and the second valve port 26. When the lead screw 3 moves downward until the first sealing part 56 abuts against the first valve port 25, it restricts further movement of the second valve core 5. When the first sealing part 56 does not abut against the first valve port 25, the first interface 22 and the second interface 23 are connected.

[0038] The first elastic element 6 is disposed between the first valve core 4 and the first boss portion 31. When the lead screw 3 moves downward to the point where the first sealing portion 56 abuts against the first valve port 25, the lead screw 3 continues to move downward to continuously compress the first elastic element 6. The first elastic element 6 pushes the second valve core 5 downward or maintains the second valve core 5 with a downward tendency.

[0039] The second elastic element 7 is disposed between the first valve core 4 and the second boss portion 57. When the lead screw 3 moves upward to the point where the second sealing portion 55 abuts against the second valve port 26, the lead screw 3 continues to move upward to continuously compress the second elastic element 7. The second elastic element 7 pushes the second valve core 5 to move upward or maintains the second valve core 5 with an upward tendency.

[0040] The valve cavity 21 is also provided with a limiting plate 8. The outer side of the limiting plate 8 is fixedly connected to the valve body 2. The limiting plate 8 is provided with a through hole 81. The lead screw 3 assembly passes through the through hole 81. The through hole 81 plays a limiting and guiding role, reducing the shaking of the end of the lead screw 3, thereby improving the movement accuracy of the electric valve.

[0041] To facilitate understanding of the technical solution of this embodiment, the working mode of the electric valve will now be briefly introduced based on the position state of the second valve core 5.

[0042] In the first state, the second sealing part 55 abuts against the second valve port 26, the first interface 22 is connected to the second interface 23, and the first interface 22 is disconnected from the third interface 24.

[0043] In the second state, the first sealing part 56 and the second sealing part 55 are located between the first valve port 25 and the second valve port 26. The first interface 22 is connected to the second interface 23. The flow rate can be proportionally adjusted by controlling the distance between the second conical surface and the first interface 22.

[0044] In the third state, the first sealing part 56 abuts against the first valve port 25, the first interface 22 is connected to the third interface 24, and the first interface 22 is disconnected from the second interface 23.

[0045] See appendix Figures 3 to 6 When the lead screw 3 moves upward and changes from the second state to the first state, the lead screw 3 drives the second valve core 5 to move upward until the second sealing part 55 abuts against the second valve port 26. Since the second valve core 5 is restricted by the second valve port 26 and remains stationary, the lead screw 3 drives the first valve core 4 to continue moving upward. The first valve core 4 continuously compresses the second elastic member 7. Even if the drive component 1 stops working, the second elastic member 7 can still push the second valve core 5 to move upward or maintain the second valve core 5 with an upward tendency, overcoming the thread clearance of the lead screw 3 moving downward, eliminating the gap between the lead screw 3 and the nut assembly 13, and ensuring the stable closure of the second valve port 26.

[0046] See appendix Figures 7 to 10 When the lead screw 3 moves upward and changes from the second state to the third state, the lead screw 3 drives the second valve core 5 to move downward until the first sealing part 56 abuts against the first valve port 25. The first valve core 4 is confined within the first channel 51. The lead screw 3 and the limiting part 32 continue to move downward, and the limiting part 32 continuously compresses the first elastic member 6. Even if the driving component 1 stops working, the first elastic member 6 pushes the second valve core 5 downward or maintains the second valve core 5 with a downward tendency, overcoming the thread clearance of the lead screw 3 moving upward, eliminating the gap between the lead screw 3 and the nut assembly 13, and ensuring the stable closure of the first valve port 25.

[0047] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. An electric valve, characterized in that, include: The drive component includes a nut assembly; Valve body, with a valve cavity formed inside the valve body; A first interface is provided on the valve body and is connected to the valve cavity; The second interface is located on the valve body and communicates with the valve cavity. In the axial direction of the valve body, the second interface is located below the first interface. A first valve port is positioned circumferentially between the first interface and the second interface of the valve cavity. A lead screw is disposed in the valve cavity and threadedly engaged with the nut assembly. Under the drive of the driving component, the lead screw can move up and down along the axial direction of the valve body. The first boss portion is fixedly mounted on the lead screw; A limiting part is fixed to the end of the lead screw away from the driving component; A first valve core is sleeved on the lead screw and positioned between the first boss portion and the limiting portion, and the first valve core is movable relative to the lead screw. The second valve core is placed inside the valve cavity. A first channel and a second channel are provided inside the second valve core. The first channel is located at the upper part of the second valve core, and the first valve core is placed inside the first channel. The second channel is located at the lower part of the second valve core. The outer diameter of the limiting part is smaller than the inner diameter of the second channel and can move into the second channel. The outer diameter of the first valve core is larger than the inner diameter of the second channel. The first sealing part is disposed on the outer surface of the second valve core and can abut against the first valve port to form a sealing surface; The first elastic element is disposed between the first valve core and the first boss portion; When the lead screw moves downward to the point where the first sealing part abuts against the first valve port, the lead screw continues to move downward to continuously compress the first elastic element, and the first elastic element pushes the second valve core downward or keeps the second valve core with a downward tendency.

2. The electric valve as described in claim 1, characterized in that, Also includes: The third interface is located on the valve body and communicates with the valve cavity, and the third interface is positioned above the first interface in the axial direction of the valve body. The second valve port is positioned circumferentially between the first interface and the third interface along the valve cavity; The second sealing part is disposed on the outer surface of the second valve core and can abut against the second valve port to form a sealing surface; The second boss portion is located on the upper part of the second valve core and protrudes towards the lead screw side; The second elastic element is disposed between the first valve core and the second boss portion; When the lead screw moves upward to the point where the second sealing part abuts against the second valve port, the lead screw continues to move upward to continuously compress the second elastic element, and the second elastic element pushes the second valve core upward or keeps the second valve core with an upward tendency.

3. The electric valve as described in claim 1, characterized in that, The driving component includes: Stator assembly; A rotor assembly, comprising a rotor component sleeved inside the stator assembly and a connecting component that rotates integrally with the rotor component, the rotor assembly being capable of rotating in the excitation magnetic field generated by the stator assembly; A nut assembly, comprising a plastic nut that rotates integrally with the connector, wherein the threaded portion of the lead screw is fitted inside the plastic nut and threadedly engages with the nut assembly.

4. The electric valve as described in claim 3, characterized in that, The rotor component and the connecting component are integrally formed into a rotor assembly by injection molding, and the rotor assembly is fixedly connected to the plastic nut by injection molding.

5. The electric valve as described in claim 2, characterized in that, The first valve core includes a base portion sleeved on a lead screw and a sleeve portion disposed on the base portion. The base portion and the sleeve portion are an integral structure. The first elastic element is located inside the sleeve portion, and the second elastic element is located outside the sleeve portion.

6. The electric valve as described in claim 1, characterized in that, The valve cavity is also provided with a limiting plate, the outer side of which is fixedly connected to the valve body. The limiting plate has a through hole inside, through which the lead screw assembly passes.

7. The electric valve as described in claim 1, characterized in that, The second valve core also includes: A sealing section is formed on the outer side of the second valve core, and the outer wall of the sealing section is attached to the inner wall of the valve cavity and can move along the valve cavity; A flow channel section is provided below the sealing section, and the outer diameter of the flow channel is smaller than the inner diameter of the valve cavity; The second sealing part is located at the lower part of the flow channel section, and the outer diameter of the second sealing part is larger than the inner diameter of the first valve port and smaller than the inner diameter of the valve cavity between the first valve port and the second valve port. A first sealing part is located below the second sealing part and at a predetermined distance from the second sealing part. The outer diameter of the first sealing part is larger than the inner diameter of the first valve port and smaller than the inner diameter of the valve cavity between the first valve port and the second valve port.

8. The electric valve as described in claim 7, characterized in that, The first valve port is a sealing ring made of PTFE material, and the second valve port is a sealing ring made of PTFE material. The first valve port and the second valve port have the same structure and are distributed in a mirror image on the upper and lower sides of the first interface.

9. The electric valve as described in claim 8, characterized in that, The first valve port includes a fixing part and a sealing part. The fixing part is press-fitted into the groove of the valve body, and the sealing part is an annular boss with an inclined surface, which faces the first sealing part.

10. An automotive thermal management system, characterized in that, Includes the electric valve as described in any one of claims 1 to 9.

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