A core iron assembly, a solenoid valve and an automobile thermal management system

Abstract

This invention provides a core-iron assembly, a solenoid valve, and an automotive thermal management system. It includes a sleeve, a coil assembly, a first iron core, a pressure head, a second iron core, and a copper ring. The coil assembly is disposed outside the sleeve; the first iron core is fixed inside the sleeve and has a groove; the pressure head is fitted into the groove; the second iron core is disposed inside the sleeve and can move axially along the sleeve; a first elastic element is disposed between the second and first iron cores; and the copper ring is sleeved between the pressure head and the sealing head. This invention, by placing a copper ring between the first and second iron cores of the solenoid valve, enables the first and second iron cores to quickly eliminate residual magnetism when the solenoid valve is de-energized and slows down the impact speed of the iron cores when energized, thereby shortening the separation time of the first and second iron cores, reducing noise when the first and second iron cores are engaged, reducing wear, and thus extending the service life of the solenoid valve.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and in particular to a core iron assembly, a solenoid valve, and an automotive thermal management system. Background Technology

[0002] In the field of solenoid valve technology, especially for solenoid valves used in automotive thermal management systems, in addition to basic technical indicators such as switching function and leakage requirements, parameters such as response speed, operating noise, and lifespan are also important indicators for evaluating the performance of solenoid valves. When the coil of a solenoid valve is energized, the iron core quickly attracts, which generates some noise. Wear caused by the collision of the iron cores is also one of the reasons for shortening the service life of the solenoid valve. When the coil of the solenoid valve is de-energized, because the iron core was magnetized when the coil was energized, it is difficult for the iron core to completely demagnetize when the coil is de-energized. Residual magnetism will still cause the iron core to briefly attract, producing a "magnetic viscosity" effect, prolonging the solenoid valve's mode switching action time. If the residual magnetism problem cannot be effectively solved, the solenoid valve may even fail. Therefore, it is necessary to provide a solenoid valve and automotive thermal management system to overcome the above-mentioned defects. Summary of the Invention

[0003] The purpose of this invention is to provide a core iron assembly, a solenoid valve, and an automotive thermal management system.

[0004] According to a first aspect of the present invention, a core iron assembly is provided, comprising: casing; A coil assembly, wherein the coil assembly is disposed outside the sleeve; The first iron core is fixed inside the sleeve and has a groove on it. A pressing head, which is fitted into the groove portion; The second iron core is disposed inside the sleeve and adjacent to the pressure head; under the action of the coil assembly, the first iron core or the second iron core can move along the axial direction of the sleeve so that the first iron core and the second iron core are in contact. The first elastic element is disposed between the second iron core and the first iron core; A copper ring is fitted between the first iron core and the pressure head.

[0005] Preferably, the groove portion includes a first groove and a second groove arranged adjacent to each other along the axial direction, the inner diameter of the second groove is larger than the inner diameter of the first groove, and the copper ring is sleeved on the circumferential direction of the pressure head and disposed in the second groove.

[0006] Preferably, the pressing head includes an embedded section and a pressing section with an integrally formed structure. The embedded section is fitted into the first groove, and the outer diameter of the upper surface of the pressing section is larger than the inner diameter of the first groove and smaller than the inner diameter of the second groove.

[0007] Preferably, a portion of the copper ring protrudes from the lower surface of the first iron core, such that a predetermined gap remains between the first and second iron cores when they are joined together.

[0008] Preferably, the copper ring includes a body portion and a protrusion portion integrally formed with the body portion and located on the outer edge side of the body portion, the protrusion portion protruding axially from the lower surface of the first iron core.

[0009] Preferably, the thickness of the copper ring is greater than the axial height of the second groove.

[0010] Preferably, the groove includes a first slot, the pressing head includes an embedding section and a third slot located circumferentially on the embedding section, the copper ring is disposed in the third slot, and the embedding section and the copper ring are integrally embedded in the first slot.

[0011] Preferably, the pressure head is provided with a through hole, which extends from the lower part of the first iron core to the upper part of the first iron core.

[0012] Preferably, according to a second aspect of the invention, a solenoid valve is provided, comprising: Core iron components; Valve cover, which is fixedly connected to the core iron assembly; The valve body is fixedly connected to the valve cover, and the valve body and the valve cover form a valve cavity. The bottom of the valve body is provided with a valve seat, which has an annular structure. The internal area of ​​the valve seat is connected to the first valve port, and the circumferential area of ​​the valve seat is connected to the second valve port. A piston assembly is disposed within the valve cavity and is movable up and down along the valve cavity. The piston assembly includes a body portion, a sealing block disposed within the body portion, a first balance flow channel connecting the upper part of the valve cavity to the first valve port, and a second balance flow channel connecting the upper part of the valve cavity to the second valve port. The first balance flow channel and the valve needle are located on the same axis, and the second balance flow channel is the gap between the piston assembly and the inner wall of the valve cavity. When the valve needle abuts against the upper end face of the first balance flow channel, the piston assembly abuts against the valve seat, sealing the passage between the first valve port and the second valve port.

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

[0014] Compared with the prior art, the core iron assembly, solenoid valve and automotive thermal management system provided by the present invention have the following beneficial effects: By setting a copper ring between the first iron core and the second iron core of the solenoid valve, the present invention enables the first iron core and the second iron core to quickly eliminate residual magnetism when the solenoid valve is de-energized and to slow down the impact speed of the iron core when energized, thereby reducing the action time for the first iron core and the second iron core to separate, reducing the noise when the first iron core and the second iron core are engaged, reducing wear and thus extending the working life of the solenoid 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 structure of the solenoid valve in this invention; Figure 2 This is a top view of the solenoid valve in Embodiments 1 and 2 of the present invention; Figure 3 This is a cross-sectional schematic diagram of the solenoid valve in Embodiment 1 of the present invention; Figure 4 This is one of the enlarged partial views of the core iron assembly in Embodiment 1 of the present invention; Figure 5 This is a second enlarged view of the core iron assembly in Embodiment 1 of the present invention; Figure 6 This is a third enlarged view of the core iron assembly in Embodiment 1 of the present invention; Figure 7 This is a partial enlarged view of the valve body assembly in Embodiment 1 of the present invention; Figure 8 This is a cross-sectional schematic diagram of the solenoid valve in Embodiment 2 of the present invention; Figure 9 This is a partial enlarged view of the core iron assembly in Embodiment 2 of the present invention; Figure 10 This is a top view of the solenoid valve in Embodiment 3 of the present invention; Figure 11 This is a cross-sectional schematic diagram of the solenoid valve in Embodiment 3 of the present invention; Figure 12 This is a partial enlarged view of the core iron assembly in Embodiment 3 of the present invention.

[0016] Figure 13 This is a partial enlarged view of the valve body assembly in Embodiment 3 of the present invention; Explanation of reference numerals in the attached figures: 1. Housing; 12. Screw assembly; 2. Sleeve; 3. Coil assembly; 4. First iron core; 41. Sealing head; 411. First slot; 412. Second slot; 413. Threaded hole; 42. Pressing head; 421. Embedded section; 422. Pressing section; 423. Through hole; 424. Third slot; 425. Fourth slot; 5. Second iron core; 51. Fifth slot; 52. Pressure ring; 43. Movable cavity; 6. Copper ring; 7. First elastic element; 8. Second elastic element; 100. Core iron assembly; 200. Valve needle; 210. Shoulder; 300, Valve body assembly; 310, Valve cover; 320, Valve body; 330, Piston assembly; 340, Valve chamber; 350, Valve seat; 360, First valve port; 370, Second valve port; 380, First balance flow channel; 390, Second balance flow channel. 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. Example 1

[0023] See Figures 1 to 7 This embodiment discloses a solenoid valve, which is mainly used in automotive thermal management systems. This embodiment takes a normally closed solenoid valve as an example for explanation. When the coil assembly 3 is not energized, the solenoid valve is in the closed state.

[0024] See appendix Figure 3 The solenoid valve includes a core iron assembly 100, a valve needle 200, and a valve body assembly 300. The core iron assembly 100 provides power to the entire solenoid valve, attracting the moving iron core to move upward, driving the valve needle 200 to open the fluid passage, and realizing the opening and closing control of the fluid passage.

[0025] See appendix Figure 3 The core iron assembly 100 includes a housing 1, a sleeve 2, a coil assembly 3, a first iron core 4, a second iron core 5, a copper ring 6, and a first elastic element 7. The housing 1 is used to install the core iron assembly 100. The coil assembly 3 is sleeved on the outside of the sleeve 2. The first iron core 4 and the second iron core 5 are arranged inside the sleeve 2, adjacent to each other. The first iron core 4 serves as a stationary iron core. A threaded hole 413 is provided on the end face of the first iron core 4 away from the second iron core 5. The sleeve 2 and the first iron core 4 are fixed in the housing 1 by a screw assembly 12. The first iron core 4 is fixed in the sleeve 2. The first iron core 4 includes a sealing head 41 fixed in the sleeve 2, a groove in the sealing head 41, and a pressing head 42 fitted in the groove. The second iron core 5 serves as a moving iron core. It is located within the sleeve 2 and can move axially along the sleeve 2. Under the action of the coil assembly 3, the second iron core 5 can move axially along the sleeve 2, causing the first iron core 4 to fit against the second iron core 5. A first elastic element 7 is also provided between the first iron core 4 and the second iron core 5. The copper ring 6 is sleeved between the sealing head 41 and the pressing head 42 and is located within the second slot 412 of the sealing head 41.

[0026] In the existing technology, on the one hand, when the coil assembly 3 is energized, the second iron core 5 and the first iron core 4 are magnetized and attract each other. Since the first iron core 4 is fixed, the second iron core 5 moves towards the first iron core 4. As the distance between the second iron core 5 and the first iron core 4 decreases, the attraction force between them increases, and the movement speed also increases. Even if the first elastic element 7 reduces the movement speed of the second iron core 5, the impact will still cause noise. On the other hand, at the moment the solenoid valve coil is de-energized, the iron core is difficult to completely demagnetize, and the residual magnetism will still cause the iron core to be attracted briefly, producing a "magnetic viscosity" effect, which prolongs the action time of the solenoid valve mode switching.

[0027] In this embodiment, when the coil is energized and the second iron core 5 is attracted to the first iron core 4, an induced current is generated inside the copper ring 6 during the movement of the core iron. This generates a magnetic field opposite to the direction of the existing main magnetic field, hindering the movement of the second iron core 5. However, the magnetic field generated by the copper ring 6 is small and does not last. During the attraction movement of the second iron core 5, the copper ring 6 acts as a damper, buffering the moving iron core when the first iron core 4 is about to be attracted. This buffering disappears quickly and does not affect the final attraction state of the iron core; it only reduces the impact sound generated when the second iron core 5 is attracted.

[0028] In this embodiment, when the coil is de-energized, an induced current is generated in the copper ring 6, which in turn generates a small magnetic field. After interaction, the iron core is quickly demagnetized, thus separating smoothly and greatly shortening the action time of the solenoid valve mode switching.

[0029] See appendix Figure 4 To facilitate the installation of the copper ring 6, the first iron core 4 is designed as a split structure. The groove includes a first groove 411 and a second groove 412. The first groove 411 and the second groove 412 are arranged adjacent to each other along the axial direction. The inner diameter of the second groove 412 is larger than the inner diameter of the first groove 411. The copper ring 6 is sleeved on the pressure head 42 and is located in the second groove 412.

[0030] The pressure head 42 includes an integrally formed embedding section 421 and a pressing section 422. The embedding section 421 is a cylindrical structure and is fitted into the first slot 411. The pressing section 422 is a conical structure. The pressing section 422 cooperates with the second iron core 5, so that the pressing section 422 is fitted into the fifth slot 51 of the second iron core 5, thereby realizing the switching of different states of the solenoid valve.

[0031] The copper ring 6 is sleeved around the embedded section 421 and located in the second groove 412. The bottom diameter of the pressing section 422 is larger than the diameter of the embedded section 421, so that the pressing section 422 has a limiting function, and the copper ring 6 is fixedly installed in the second groove 412.

[0032] To facilitate the assembly of the first iron core 4, the pressing head 42 is provided with a through hole 423, which extends from the lower part of the sealing head 41 to the upper part of the sealing head 41. Specifically, the pressing head 42 also includes a fourth slot 425 disposed within the pressing section 422 and arranged axially, and a through hole 423 penetrating through the fourth slot 425 to the upper part of the sealing head 41. Since the sealing head 41 and the pressing head 42 are interference-fitted, during the assembly process, the gas in the first slot 411 can be discharged through the through hole 423, thereby facilitating the assembly of the first iron core 4. In addition, the first elastic member 7 is partially located within the fourth slot 425. The function of the first elastic member 7 is to provide elastic force when the power is off, so that the first iron core 4 separates from the second iron core 5.

[0033] In a preferred embodiment, a portion of the copper ring 6 protrudes from the lower surface of the sealing head 41, creating a predetermined gap between the first iron core 4 and the second iron core 5 when they are joined. (See attached document.) Figure 5 The copper ring 6 includes a body portion and a protrusion integrally formed with the body portion and located on the outer edge side of the body portion. The protrusion protrudes axially from the lower surface of the sealing head 41. (See attached document) Figure 6 The thickness of the copper ring 6 is greater than the axial height of the second slot 412. This arrangement not only enables the copper ring 6 to perform its demagnetizing and damping functions, but also, because the copper ring protrudes from the lower surface of the sealing head, leaving a gap when the first iron core 4 and the second iron core 5 are attracted together, it can directly reduce the attraction between the second iron core 5 and the first iron core 4 physically, thus avoiding the problem of the first elastic element 7 having an excessively large elastic coefficient.

[0034] The valve needle 200 is disposed at the bottom of the second iron core 5. The second iron core 5 has a movable cavity 43 inside. The upper part of the valve needle 200 has a shoulder 210. The shoulder 210 is located in the movable cavity 43 and can move a predetermined distance along the axial direction of the movable cavity 43. The lower part of the valve needle 200 passes through the movable cavity 43 along the axial direction and enters the valve body assembly 300. A second elastic member 8 is provided between the shoulder 210 and the top of the movable cavity 43.

[0035] When the coil assembly 3 is not energized, there is a certain distance between the lower end face of the shoulder 210 of the valve needle 200 and the abutment surface of the second iron core 5 against the valve needle 200, forming a "no-stroke" when the second iron core 5 moves. That is, during the process of the second iron core 5 and the first iron core 4 being attracted together, the valve needle 200 remains stationary until the abutment surface contacts the lower end face of the shoulder 210 of the valve needle 200, and the compression of the second elastic member 8 decreases. Therefore, the magnetic force required for the second iron core 5 to move upward is smaller.

[0036] When the current in coil assembly 3 is constant, the greater the distance between the first iron core 4 and the second iron core 5, the smaller the magnetic force, i.e., the smaller the attraction force. Therefore, the less resistance the second iron core 5 needs to overcome in the initial stage of movement, the better; the "no-load stroke" plays this role. After the holding surface contacts the valve needle 200, the second iron core 5 drives the valve needle 200 to continue moving upward, thereby opening the flow channel of the solenoid valve.

[0037] See appendix Figure 7 The valve body assembly 300 includes a valve cover 310, a valve body 320, and a piston assembly 330. The valve cover 310 is fixedly connected to the housing 1 of the core iron assembly 100. The valve body 320 is fixedly connected to the valve cover 310, forming a valve cavity 340. A valve seat 350 with an annular structure is provided at the bottom of the valve body 320. The internal area of ​​the valve seat 350 communicates with a first valve port 360, which is the outlet end. The circumferential area of ​​the valve seat 350 communicates with a second valve port 370, which is the inlet end. The piston assembly 330 is disposed within the valve cavity 340 and can move up and down along the valve cavity 340, dividing the valve cavity 340 into an upper part and a lower part. The valve seat 350 is located in the lower part of the valve cavity 340.

[0038] The piston assembly 330 includes a body portion and a sealing block disposed within the body portion. The body portion has a cylindrical structure, and the sealing block is fixedly disposed within the body portion. A first balancing flow channel 380 is provided within the sealing block, connecting the upper part of the valve chamber 340 to the first valve port 360. A second balancing flow channel 390 is provided within the body portion and the sealing block, connecting the upper part of the valve chamber 340 to the second valve port 370. The first balancing flow channel 380 and the valve needle 200 are located on the same axis, and the upper surface of the first balancing flow channel 380 forms a support surface that mates with the valve needle 200, thereby achieving the blocking or opening of the first balancing flow channel 380.

[0039] In the closed state (coil assembly 3 is de-energized), under the action of the first elastic element 7, the second iron core 5 is located at the lower limit position. The valve needle 200 plays a limiting role and blocks the first balance flow channel 380. The upper part of the valve cavity 340 is connected to the second valve port 370 only through the second balance flow channel 390. The upper part of the valve cavity 340 is connected to the high pressure chamber of the second valve port 370, and the pressure is the same as the pressure of the high pressure chamber. The piston assembly 330 moves downward under the pressure difference and the push of the valve needle 200, closing the passage between the first valve port 360 and the second valve port 370.

[0040] In the open state (coil assembly 3 is energized), under the electromagnetic action of coil assembly 3, valve needle 200 is driven out of valve cavity 340 by second iron core 5. First balance flow channel 380 connects first valve port 360 (low pressure) with upper part of valve cavity 340, and second balance flow channel 390 connects second valve port 370 (high pressure) with upper part of valve cavity 340. At this time, upper part of valve cavity 340 is located between high pressure and low pressure. Piston assembly 330 moves upward under the action of pressure difference, opening the passage between first valve port 360 and second valve port 370. Example 2

[0041] See Figure 8 , 9 This embodiment discloses a solenoid valve. This embodiment uses a normally closed solenoid valve as an example for explanation. When the coil is not energized, the solenoid valve is in the closed state. The solenoid valve includes: a core iron assembly 100, a valve needle 200, and a valve body assembly 300. This embodiment focuses on describing the structure of the core iron assembly 100; the structure of the valve body assembly 300 is the same as in Embodiment 1.

[0042] See appendix Figure 8 The core iron assembly 100 includes a housing 1, a sleeve 2, a coil assembly 3, a first iron core 4, a second iron core 5, a copper ring 6, and a first elastic element 7. The housing 1 is used to mount the core iron assembly 100. The sleeve 2 is fixed inside the housing 1. The coil assembly 3 is sleeved outside the sleeve 2. The first iron core 4 and the second iron core 5 are located inside the sleeve 2, adjacent to each other. The first iron core 4 serves as a stationary iron core, fixed inside the sleeve 2. The first iron core 4 includes a sealing head 41 fixed inside the sleeve 2, a groove within the sealing head 41, and a pressing head 42 fitted into the groove. The second iron core 5 serves as a moving iron core, located inside the sleeve 2 and axially movable along the sleeve 2. Under the action of the coil assembly 3, the second iron core 5 can move axially along the sleeve 2, causing the first iron core 4 and the second iron core 5 to come into contact. A first elastic element 7 is provided between the first iron core 4 and the second iron core 5, and the copper ring 6 is sleeved between the sealing head 41 and the pressing head 42.

[0043] See appendix Figure 9To facilitate the installation of the copper ring 6, the first iron core 4 is designed as a split structure. The copper ring 6 is disposed on the first iron core 4. The first iron core 4 includes a sealing head 41 fixed in the sleeve 2, a groove portion disposed in the sealing head 41, and a pressing head 42 fitted in the groove portion. The groove portion includes a first slot 411. The pressing head 42 includes an insert section 421 and a third slot 424 disposed in the circumferential direction of the insert section 421. The insert section 421 is fitted in the first slot 411, and the copper ring 6 is sleeved on the insert section 421 and disposed in the third slot 424.

[0044] The first iron core 4 includes a pressure head 42 and a fourth slot 425 located at the bottom of the pressure head 42 and arranged axially. A fifth slot 51 is provided at the top of the second iron core 5. A pressure ring 52 is provided on the fifth slot 51. The first elastic member 7 is located between the top of the fourth slot 425 and the pressure ring 52 and is located inside the fourth slot 425 to realize the reset of the second iron core 5.

[0045] To facilitate the assembly of the first iron core 4, the pressing head 42 further includes a fifth slot 51 disposed within the pressing section 422 and arranged axially, and a through hole 423 extending through the fifth slot 51 to the upper part of the sealing head 41. A first elastic element 7 is provided between the first iron core 4 and the second iron core 5, and the first elastic element 7 is located within the fifth slot 51. Since the sealing head 41 and the pressing head 42 are interference-fitted, during the assembly process, the gas in the first slot 411 can be discharged through the through hole 423, facilitating the assembly of the first iron core 4. Example 3

[0046] See appendix Figures 10 to 13 This embodiment discloses a solenoid valve, which is mainly used in automotive thermal management systems. This embodiment takes a normally open solenoid valve as an example for explanation. When the coil assembly 3 is not energized, the solenoid valve is in the open state.

[0047] See appendix Figure 11 The solenoid valve includes a core assembly 100, a valve needle 200, and a valve body assembly 300. The core assembly 100 provides power to the entire solenoid valve, attracting the moving iron core to move downwards, driving the valve needle 200 to close the passage, and realizing the closure control of the fluid passage.

[0048] The core iron assembly 100 includes a housing 1, a sleeve 2, a coil assembly 3, a first iron core 4, a second iron core 5, a copper ring 6, and a first elastic element 7. The housing 1 is used to mount the core iron assembly 100. A plug is fitted onto the upper part of the sleeve 2, and the sleeve 2 is fixed inside the housing 1 by a screw assembly 12. The coil assembly 3 is sleeved on the outside of the sleeve 2. The first iron core 4 and the second iron core 5 are located inside the sleeve 2, arranged adjacent to each other. Unlike the previous two embodiments, the first iron core 4 is a movable iron core and can move axially along the sleeve 2. The first iron core 4 includes a sealing head 41 fixed inside the sleeve 2, a groove portion provided in the sealing head 41, and a pressing head 42 fitted into the groove portion. The second iron core 5 is a stationary iron core, fixed to the sleeve 2. Under the action of the coil assembly 3, the first iron core 4 can move axially along the sleeve 2, causing the first iron core 4 and the second iron core 5 to fit together. A first elastic element 7 is provided between the first iron core 4 and the second iron core 5, and the copper ring 6 is sleeved between the sealing head 41 and the pressing head 42.

[0049] See appendix Figure 12 To facilitate the installation of the copper ring 6, the first iron core 4 is designed as a split structure. The groove includes a first groove 411 and a second groove 412. The first groove 411 and the second groove 412 are arranged adjacent to each other along the axial direction. The inner diameter of the second groove 412 is larger than the inner diameter of the first groove 411. The copper ring 6 is sleeved on the pressure head 42 and is located in the second groove 412.

[0050] The pressure head 42 includes an integrally formed embedding section 421 and a pressing section 422. The embedding section 421 is a cylindrical structure and is fitted into the first slot 411. The pressing section 422 is a conical structure. The pressing section 422 cooperates with the second iron core 5, so that the pressing section 422 is fitted into the fifth slot 51 of the second iron core 5, thereby realizing the switching of different states of the solenoid valve.

[0051] The copper ring 6 is sleeved around the embedded section 421 and located in the second groove 412. The bottom diameter of the pressing section 422 is larger than the diameter of the embedded section 421, so that the pressing section 422 has a limiting function, and the copper ring 6 is fixedly installed in the second groove 412.

[0052] See appendix Figure 11 , 12The first iron core 4 has a movable cavity 43. The upper part of the valve needle 200 has a shoulder 210, which is located in the movable cavity 43 and can move axially along the movable cavity 43 by a predetermined distance. The lower part of the valve needle 200 passes axially through the movable cavity 43 and the second iron core 5 into the valve body assembly 300. The pressure head 42 has a through hole 423, which extends from the lower part of the sealing head 41 to the upper part of the sealing head 41. On the one hand, the through hole can be used to assemble the valve needle 200. On the other hand, during the assembly process, the gas in the first slot 411 can be discharged through the through hole, which facilitates the assembly of the first iron core 4.

[0053] See appendix Figure 13 The valve body assembly 300 includes a valve cover 310, a valve body 320, and a piston assembly 330. The valve cover 310 is fixedly connected to the housing 1 of the core iron assembly 100. The valve body 320 is fixedly connected to the valve cover 310, forming a valve cavity 340. A valve seat 350 with an annular structure is provided at the bottom of the valve body 320. The internal area of ​​the valve seat 350 communicates with a first valve port 360, which is the outlet end. The circumferential area of ​​the valve seat 350 communicates with a second valve port 370, which is the inlet end. The piston assembly 330 is disposed within the valve cavity 340 and can move up and down along the valve cavity 340, dividing the valve cavity 340 into an upper part and a lower part. The valve seat 350 is located in the lower part of the valve cavity 340.

[0054] The piston assembly 330 includes a body portion and a sealing block disposed within the body portion. The body portion has a cylindrical structure, and the sealing block is fixedly disposed within the body portion. A first balancing flow channel 380 is provided within the sealing block, connecting the upper part of the valve chamber 340 to the first valve port 360. A second balancing flow channel 390 is provided within the body portion and the sealing block, connecting the upper part of the valve chamber 340 to the second valve port 370. The first balancing flow channel 380 and the valve needle 200 are located on the same axis, enabling the sealing or opening of the first balancing flow channel 380.

[0055] In the closed state (coil assembly 3 is energized), under the electromagnetic action of coil assembly 3, the first iron core 4 is located at the lower limit position. The valve needle 200 acts as a limit and blocks the first balance flow channel 380. The upper part of the valve cavity 340 is connected to the second valve port 370 only through the second balance flow channel 390. The upper part of the valve cavity 340 is connected to the high pressure chamber of the second valve port 370, and the pressure is the same as the pressure of the high pressure chamber. The piston assembly 330 moves downward under the pressure difference and the push of the valve needle 200, closing the passage between the first valve port 360 and the second valve port 370.

[0056] In the open state (coil assembly 3 is de-energized), under the action of the first elastic element 7, the valve needle 200 is driven by the first iron core 4 to exit the valve chamber 340. The first balance flow channel 380 connects the first valve port 360 (low pressure) with the upper part of the valve chamber 340, and the second balance flow channel 390 connects the second valve port 370 (high pressure) with the upper part of the valve chamber 340. At this time, the upper part of the valve chamber 340 is located between the high pressure and the low pressure. The piston assembly 330 moves upward under the action of the pressure difference, opening the passage between the first valve port 360 and the second valve port 370.

[0057] Similar to Embodiment 1, in a preferred embodiment, a portion of the copper ring 6 protrudes from the lower surface of the sealing head 41, resulting in a predetermined gap between the first iron core 4 and the second iron core 5 in the coupled state. (See attached diagram.) Figure 5 The copper ring 6 includes a body portion and a protrusion integrally formed with the body portion and located on the outer edge side of the body portion. The protrusion protrudes axially from the lower surface of the sealing head 41. (See attached document) Figure 6 The thickness of the copper ring 6 is greater than the axial height of the second slot 412. This arrangement not only enables the copper ring 6 to perform its demagnetizing and damping functions, but also directly reduces the attractive force between the second iron core 5 and the first iron core 4, avoiding the problem of excessive elasticity of the first elastic element 7.

[0058] 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. A core iron assembly, characterized in that, include: casing; A coil assembly, wherein the coil assembly is disposed outside the sleeve; The first iron core is fixed inside the sleeve and has a groove on it. A pressing head, which is fitted into the groove portion; The second iron core is disposed inside the sleeve and adjacent to the pressure head; under the action of the coil assembly, the first iron core or the second iron core can move along the axial direction of the sleeve so that the first iron core and the second iron core are in contact. The first elastic element is disposed between the second iron core and the first iron core; A copper ring is fitted between the first iron core and the pressure head.

2. The core iron assembly as described in claim 1, characterized in that, The groove includes a first groove and a second groove arranged adjacent to each other along the axial direction. The inner diameter of the second groove is larger than the inner diameter of the first groove. The copper ring is sleeved on the circumferential direction of the pressure head and is located inside the second groove.

3. The core iron assembly as described in claim 2, characterized in that, The pressing head includes an embedded section and a pressing section with an integrally formed structure. The embedded section is fitted into the first slot, and the outer diameter of the upper surface of the pressing section is larger than the inner diameter of the first slot and smaller than the inner diameter of the second slot.

4. The core iron assembly as described in claim 3, characterized in that, A portion of the copper ring protrudes from the lower surface of the first iron core, creating a predetermined gap between the first and second iron cores when they are joined together.

5. The core iron assembly as described in claim 4, characterized in that, The copper ring includes a body portion and a protrusion portion integrally formed with the body portion and located on the outer edge side of the body portion. The protrusion portion protrudes axially from the lower surface of the first iron core.

6. The core iron assembly as described in claim 4, characterized in that, The thickness of the copper ring is greater than the axial height of the second groove.

7. The core iron assembly as described in claim 1, characterized in that, The groove includes a first slot, the pressing head includes an embedding section and a third slot located circumferentially on the embedding section, the copper ring is located in the third slot, and the embedding section and the copper ring are integrally embedded in the first slot.

8. The core iron assembly as described in claim 1, characterized in that, The pressure head is provided with a through hole, which extends from the lower part of the first iron core to the upper part of the first iron core.

9. The solenoid valve as described in claim 1, characterized in that, Also includes: A core assembly having the structure of a core assembly as described in any one of claims 1 to 8; Valve cover, which is fixedly connected to the core iron assembly; The valve body is fixedly connected to the valve cover, and the valve body and the valve cover form a valve cavity. The bottom of the valve body is provided with a valve seat, which has an annular structure. The internal area of ​​the valve seat is connected to the first valve port, and the circumferential area of ​​the valve seat is connected to the second valve port. A piston assembly is disposed within the valve cavity and is movable up and down along the valve cavity. The piston assembly includes a body portion, a sealing block disposed within the body portion, a first balance flow channel connecting the upper part of the valve cavity to the first valve port, and a second balance flow channel connecting the upper part of the valve cavity to the second valve port. The first balance flow channel and the valve needle are located on the same axis, and the second balance flow channel is the gap between the piston assembly and the inner wall of the valve cavity. When the valve needle abuts against the upper end face of the first balance flow channel, the piston assembly abuts against the valve seat, sealing the passage between the first valve port and the second valve port.

10. An automotive thermal management system, characterized in that, Includes the solenoid valve as described in claim 9.

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