Solenoid valve and thermal management system of vehicle

Abstract

The utility model provides a solenoid valve and a thermal management system of a vehicle. The electromagnetic valve (1) comprises a valve piston (11), the valve piston (11) conducts stroke motion in response to current of the electromagnetic valve (1) and limits the opening position and the closing position of the electromagnetic valve (1), the valve piston (11) comprises a magnetic conduction section and a sliding section, a sliding face is constructed on the surface of the sliding section, the magnetic conductivity of the sliding face is lower than that of the magnetic conduction section, and the magnetic conduction section and the sliding section are connected through the sliding face. And for guiding the stroke movement of the valve piston (11). According to the invention, high control precision and high response speed can be realized, and good motion performance can be realized at the same time.

Description

Technical Field

[0001] The present disclosure belongs to the field of flow control valves, and in particular, relates to a solenoid valve and a thermal management system of a vehicle. Background Art

[0002] This section is intended to provide background information relevant to understanding the various technologies described herein. As implied by the title of this section, this is a discussion of related technologies that should not in any way imply that they are necessarily prior art. Therefore, it should be understood that any statement in this section should be read from this perspective, rather than any admission of prior art.

[0003] Among electronic expansion valves, electronic expansion valves driven by stepper motors are one design form, which include speed reduction type and direct acting type; in addition, electromagnetic expansion valves are also one design form. Among them, electronic expansion valves driven by stepper motors can achieve precise and stable control, but the response from closed to fully open state is slow, and the cost is high due to the complex structure; while electromagnetic expansion valves have low cost and high responsiveness, but may not meet high performance requirements (such as control accuracy, stability, and flexibility to meet different systems). Utility Model Content

[0004] According to different aspects, the object of the present disclosure is to provide a solenoid valve that can achieve high control accuracy and fast response speed while having good movement performance.

[0005] In addition, the present disclosure is also intended to solve or alleviate other technical problems existing in the prior art.

[0006] The present disclosure solves the above problems by providing a solenoid valve and a thermal management system for a vehicle. Specifically, according to one aspect of the present disclosure, there is provided:

[0007] A solenoid valve, wherein the solenoid valve includes a valve piston, the valve piston performs a stroke movement in response to the current of the solenoid valve and defines the open position and the closed position of the solenoid valve, the valve piston includes a magnetic conductive section and a sliding section, the surface of the sliding section is constructed with a sliding surface, the magnetic permeability of the sliding surface is lower than the magnetic permeability of the magnetic conductive section, and the sliding surface is used to guide the stroke movement of the valve piston.

[0008] According to another aspect of the present disclosure, the present disclosure provides a thermal management system for a vehicle, wherein the thermal management system includes any one of the above-mentioned solenoid valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other features of the present disclosure will become apparent with reference to the accompanying drawings, in which:

[0010] Figure 1A cross-sectional schematic diagram of a solenoid valve according to the present disclosure is shown;

[0011] Figure 2 A cross-sectional schematic diagram of another solenoid valve according to the present disclosure is shown;

[0012] Figure 3 A three-dimensional schematic diagram of a valve piston according to the present disclosure is shown;

[0013] Figure 4 A cross-sectional schematic diagram of a valve core according to the present disclosure is shown; and

[0014] Figure 5 A cross-sectional schematic diagram of a coil assembly according to the present disclosure is shown. DETAILED DESCRIPTION

[0015] It is easy to understand that according to the technical solution of the present disclosure, without changing the essential spirit of the present disclosure, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present disclosure, and should not be regarded as the entirety of the present disclosure or as a limitation or restriction to the technical solution of the present disclosure.

[0016] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third", etc. or similar expressions are only used for description and distinction purposes, and cannot be understood as indicating or implying the relative importance of the corresponding components.

[0017] refer to Figure 1 , which shows a cross-sectional schematic diagram of a solenoid valve according to the present disclosure.

[0018] The solenoid valve 1 includes a valve piston 11, which performs stroke motion in response to the current of the solenoid valve 1 and defines the open position and the closed position of the solenoid valve 1. The valve piston 11 includes a magnetic conductive section and a sliding section. The surface of the sliding section is configured with a sliding surface. The magnetic permeability of the sliding surface is lower than that of the magnetic conductive section and is used to guide the stroke motion of the valve piston 11.

[0019] According to the technical solution, through the design of the solenoid valve, the valve piston can make stroke movement according to the current of the solenoid valve. For example, the larger the current, the larger the opening of the solenoid valve. Therefore, the solenoid valve can also be understood as a proportional valve. It can be understood that high-precision opening adjustment can be achieved by fine control of the current, thereby achieving high-precision fluid flow control. In this regard, the valve piston has the dual functions of the armature (i.e., it is attracted by the electromagnet and makes a lift movement) and the piston (i.e., it limits the opening and closing position / state of the solenoid valve), and has the functions of fine flow adjustment and flow opening and closing. Compared with some other solenoid valves (in this solenoid valve, it realizes the switching between the open and closed positions by the on and off of the electromagnet, but there is no intermediate position, but the flow regulation is realized by the duty cycle adjustment method. Since the duty cycle adjustment is achieved by switching the switch state, this solenoid valve often has a large operating noise), it has higher adjustment accuracy and low noise.

[0020] This design divides the valve piston into a magnetic section and a sliding section. It should be understood that the magnetic section is used to respond to the electromagnetic valve, for example, the magnetic field generated after the coil is energized, so that the magnetic circuit of the electromagnetic valve passes through the magnetic section to be acted upon by the magnetic force, thereby driving the valve piston to perform corresponding movements. Therefore, the design of the magnetic section affects the response speed and accuracy of the valve piston movement. On the other hand, the motion performance of the valve piston, such as motion coordination or motion guidance, motion durability, and motion smoothness are also relatively important performance indicators. Correspondingly, the sliding surface of the sliding section of this scheme is responsible for guiding the movement of the valve piston. For example, during the movement, the sliding surface can cooperate with surrounding parts, such as the valve body and the magnetic circuit isolator to be explained below, to ensure that the valve piston has the expected motion behavior and runs smoothly. Therefore, through the design of the magnetic section and the sliding section, it is possible to find a balance between the response performance and the motion performance, and achieve the purpose of the present disclosure.

[0021] To this end, the present solution defines that the magnetic permeability of the sliding surface is lower than the magnetic permeability of the magnetic section, so that the magnetic circuit can mainly pass through the magnetic section to drive the piston, and can guide the magnetic circuit through the magnetic area inside the valve piston to achieve precise motion response, while the motion guidance of the piston is mainly or only supported by the sliding section (in some embodiments, the magnetic section does not contact the surrounding parts), and the above-mentioned technical effects are achieved in a division of labor. In this regard, it should be known that in order to form the expected closed magnetic circuit, the sliding surface is constructed to have relatively low magnetic permeability or non-magnetic conductivity, while the other parts of the sliding section except the sliding surface still have magnetic permeability. In this regard, the valve piston can be constructed as a rotating body, such as a rotating body structure based on a cylinder. It is also feasible that the diameter of the magnetic section is smaller than the diameter of the sliding section, so that the functional distinction between the magnetic section and the sliding section can be achieved through the structural design and manufacture of the valve piston, and thereby the respective expected technical effects can be achieved. Alternatively or supplementally, the magnetic conductive section and sliding section of the valve piston may have the same diameter, while the sections of the components that cooperate therewith, such as the magnetic conductive section, sliding section of the valve body and the guide portion of the magnetic circuit isolator to be introduced below, may be designed with different inner diameters. For example, the magnetic conductive section may have a larger inner diameter, while the sliding section and the guide portion may have smaller inner diameters.

[0022] In order to achieve low magnetic permeability of the sliding surface and to improve the wear resistance of the sliding surface, so as to improve the motion durability of the valve piston, in some embodiments of the present disclosure, the sliding surface is constructed with a heat treatment portion. The heat treatment portion is formed, for example, by a carburized layer, which can improve the hardness and wear resistance of the part, improve the fatigue strength of the part, enhance the dimensional stability of the part, refine the grains (improve toughness and strength), improve process stability, and has good compatibility with the heat treatment process. In addition, according to carburization, material composition and heat treatment process, the carburized layer can reduce the magnetic permeability of the sliding surface, thereby better guiding the magnetic circuit through the internal magnetic permeability area to achieve accurate motion response. In addition, considering the manufacturing cost and efficiency, for the manufacture of the magnetic permeability section, the entire valve piston can be heat treated together first, and then the heat treatment portion can be removed in the magnetic permeability section area, for example, by turning, so that its magnetic permeability characteristics can be maintained, and at the same time, its diameter is smaller than the diameter of the sliding section, achieving the effect of killing two birds with one stone. It can also be understood that the adjustment of improving hardness, wear resistance and / or magnetic permeability can be achieved through other surface treatment processes.

[0023] It can also be mentioned that the lengths of the magnetic conductive section and the sliding section (in the axial direction of the valve piston) should be determined adaptively according to the requirements. It should be known that the magnetic conductive section should not be too short, otherwise the magnetic resistance will be too large and the magnetic conductivity will be reduced, which is undesirable; the sliding section also needs to have a certain length so that it can have good motion guidance and good wear resistance over the entire stroke of the valve piston.

[0024] The present disclosure does not impose any particular restrictions on the material of the valve piston. As an example only, the valve piston can be made of low-carbon steel doped with rare earths. The technical effects of this design include improving strength and wear resistance, improving corrosion resistance, optimizing thermal performance, and improving magnetic properties. It should be understood that during the design and manufacturing process, the material of the valve piston needs to be selected (such as the specific type and content of rare earth doped, etc.) based on the specific performance requirements, application environment, cost, and environmental friendliness of the solenoid valve.

[0025] In some embodiments of the present disclosure, the magnetic conductive section includes a first magnetic conductive section 111 and a second magnetic conductive section 112, the sliding section includes a first sliding section 113 and a second sliding section 114, the first magnetic conductive section 111, the first sliding section 113, the second magnetic conductive section 112 and the second sliding section 114 are arranged in sequence in the axial direction of the valve piston 11, and the first sliding section 113 is arranged in the upper half of the valve piston 11.

[0026] In this technical solution, the magnetic conductive section and the sliding section are arranged crosswise so as to achieve a more comprehensive driving and motion guiding function over the entire axial length of the valve piston. In addition, this technical solution specifies that the first sliding section is arranged in the upper half of the valve piston. First of all, it should be noted that the "upper half" or similar expressions in this article are only used to express relative positions. For example, this position can be combined with Figure 1 It can also be understood as the half away from the valve seat or the half that does not limit the open position or the closed position. It can be seen from this position limitation that the first sliding section or the first sliding surface corresponding to it is higher than the center of gravity of the entire valve piston. Therefore, the shaking that may occur during the movement of the valve piston can be better limited by the first sliding section, thereby better ensuring the sliding stability of the valve piston over the entire axial length. If necessary, more sliding sections or magnetic sections can be set and the layout positions of the sliding sections and magnetic sections can be flexibly and flexibly adjusted as needed.

[0027] Combination Figure 2 and Figure 3 ,in, Figure 2 A cross-sectional schematic diagram of another solenoid valve according to the present disclosure is shown; and Figure 3 A schematic three-dimensional diagram of a valve piston according to the present disclosure is shown.

[0028] The valve piston 11 is provided with a recessed portion 115 , which extends inward from the outer periphery of the valve piston 11 and respectively connects the magnetic conductive section and the sliding section in the axial direction of the valve piston 11 .

[0029] The present disclosure recognizes that in the fluid flow test for some valve pistons, it is found that the flow curve may have a step (stuck) phenomenon, that is, with the change of the current of the solenoid valve and the lift or lowering movement of the valve piston, the fluid flow has a sudden change or the change amplitude is not always in a stable proportion to the change amplitude of the current, which is reflected in the flow curve with the flow rate as the vertical coordinate and the current as the horizontal coordinate, that is, the step or the part with non-uniform slope. The present disclosure has analyzed and confirmed that one of the reasons for this situation is that problems such as part processing accuracy and cleanliness lead to excessive friction (for example, the friction between the valve piston and surrounding parts). In addition, simulation shows that the 360° uneven sliding surface gap of the sliding section will also cause 360° uneven pressure. In response to these situations, the present disclosure proposes the above technical solution.

[0030] The construction of the recessed portion can be realized by a variety of processes, such as cutting processes such as turning to cut the valve piston, which is generally cylindrical, from the outer peripheral edge. Therefore, the recessed portion can also be understood as a cut-out portion or a gap or a notch. It can be seen that the presence of the recessed portion can reduce the weight of the valve piston and the entire solenoid valve, thereby obtaining the benefit of improving the response speed. In addition, since the recessed portion is connected to the magnetic conductive section and the sliding section in the axial direction, that is to say, in some embodiments, the recessed portion reduces the axial length of the sliding section, and at the same time, it also shortens the partial length of the magnetic conductive section without substantially affecting the electromagnetic performance. In particular, the reduction in the length of the sliding section reduces the sliding contact surface between the valve piston and the surrounding parts, reducing its sensitivity to processing accuracy and particles. After the simulation of the present disclosure for this improvement, the results show that the design can reduce the lateral pressure-bearing area of ​​the sliding section of the valve piston, thereby reducing the lateral force, and then reducing the friction force. In addition, since the length of the sliding section is reduced, the manufacturing and assembly tolerances of the sliding section within the entire periphery can be better controlled and constrained, and the accumulated tolerance is reduced, thereby improving the unevenness of the sliding surface gap. In summary, this technical solution improves the overall robustness of the product without increasing costs.

[0031] In the above-mentioned technical solution in which the magnetic conductive section includes the first and second magnetic conductive sections and the sliding section includes the first and second sliding sections, it is also feasible that the recessed portion is configured to connect the second magnetic conductive section 112 and the second sliding section 114 in the axial direction of the valve piston 11, respectively, and the above-mentioned technical effect can also be achieved. At the same time, since the first sliding surface is not affected, and the first sliding surface is exemplarily configured in the upper half of the valve piston, it is still possible to achieve a more comprehensive motion guidance and anti-swaying effect as described above. It can also be mentioned that in the case of this design, the first and second magnetic conductive sections and the first sliding section located above the recessed portion remove the interior of the sliding surface to achieve the magnetic conductive effect, that is, the valve piston area where the recessed portion is located and the valve piston area where the second sliding section is located can be set to be non-magnetic or relatively poor in magnetic conductivity. Of course, for reasons such as manufacturing cost or efficiency, these areas can also be set to be magnetic, and will not affect the generation of the magnetic circuit. Based on these concepts, those skilled in the art can adjust the size, quantity, position and other features of the recessed portion or the cut-off portion according to actual needs.

[0032] from Figure 1 and Figure 2 It can also be clearly seen that the solenoid valve 1 also includes a magnetically conductive static iron core 12, a return spring 13 arranged inside the static iron core 12, and a spring seat 14 whose magnetic conductivity is lower than that of the magnetic conductive section (for example, made of non-magnetic material), the return spring 13 is used to apply a spring force in the direction of the closed position to the valve piston 11, the spring seat 14 is arranged at the upper end of the valve piston 11 and extends upward beyond the upper end of the valve piston 11 in the axial direction of the valve piston 11, and in the open position, the spring seat 14 abuts against the static iron core 12, and the valve piston 11 is spaced apart from the static iron core 12.

[0033] It should be understood that the static iron core refers to a fixed component, and its magnetic conductivity is used to form a closed magnetic circuit. In this example, the static iron core is also constructed as a rotating body, for example, it can be modified based on the basic structure of a cylinder. A blind hole is opened in the middle of the static iron core to accommodate a reset spring and, if necessary, a gasket can also be set and accommodated to connect the upper end of the reset spring with the blind hole end of the static iron core. The gasket can disperse pressure, prevent wear, adjust clearance, reduce vibration and noise, and simplify installation. When the power is off, the reset spring can use its spring force to push the valve piston to the closed position and keep the valve piston in the closed position, thereby playing a reset function; when the power is on, the solenoid valve, for example, the electromagnet attraction generated by its coil on the valve piston can overcome the spring force of the reset spring, so that the valve piston can move to the middle position or the open position as expected. In this regard, according to the driving capacity of the electromagnet, the spring rate, material, quantity, series-parallel design, size, etc. of the return spring can be adaptively adjusted to meet the resetting requirements while allowing the valve piston to open smoothly.

[0034] As explained above for the “upper half”, the “upper end” here also only refers to a relative position, for example, it can be described as the end away from the valve seat or the end that does not limit the open position or the closed position. Figure 1 and Figure 2 It can be seen intuitively. It can be seen that when the valve piston is in the open position, the spring seat contacts the static iron core, while the valve piston does not contact the static iron core. Therefore, on the one hand, this protects the upper end of the valve piston from damage caused by the collision with the static iron core. On the other hand, if the upper end of the valve piston contacts the static iron core in the open position, when the power is off and the user wants to separate the valve piston from the static iron core, the valve piston may not be able to disengage, that is, it may be sucked by the static iron core and cannot be separated quickly. Therefore, this design avoids the above potential problems by keeping the valve piston and the static iron core always separated.

[0035] In addition, since the spring seat is in contact with the static iron core, it can be made of a harder material, at least with respect to the valve piston, which improves the wear resistance with the return spring. The spring seat is also configured with a protrusion in the center, and the lower end of the spring can be sleeved on the protrusion to support the arrangement of the spring and play a certain guiding and limiting role for the expansion and contraction of the spring.

[0036] The two-stage design of the magnetic conductive section and the sliding section of the valve piston is introduced in the foregoing text. Correspondingly, the valve body can also be designed similarly. For example, the solenoid valve 1 also includes a valve body 15, the valve piston 11 is slidably arranged in the valve body 15 and can control the flow rate of the fluid flowing through the valve body 15, the valve body 15 is provided with a magnetic conductive section and a sliding section, the diameter of the magnetic conductive section is larger than the diameter of the sliding section, and in the entire movement stroke of the valve piston 11, the magnetic conductive section and the magnetic conductive section at least partially always cooperate with each other, and the sliding section and the sliding section at least partially always cooperate with each other.

[0037] Exemplarily, the valve body is constructed as a hollow rotating body, and the gap in the middle forms a cavity, which is used to accommodate and support the stroke movement of the valve piston. In order to realize the flow control function of the valve, a through port 151 can be opened on the outer peripheral surface of the valve body. In the open position, the fluid can flow through the through port into the cavity and flow out from the lower part of the cavity; in the closed position, the valve piston can completely block the through port to hinder the inflow of the fluid; in the middle position between the open position and the closed position, the valve piston can partially block the through port, thereby realizing fine adjustment of the fluid flow. In addition, in order to realize multi-channel flow control, multiple through ports can be provided, distributed at multiple locations on the outer periphery of the valve body.

[0038] Here, the valve body has a magnetic conductive section and a sliding section, and their functions correspond to the magnetic conductive section and sliding section of the valve piston, respectively. That is to say, the magnetic conductive section of the valve body and the magnetic conductive section of the valve piston jointly support the generation of a closed magnetic circuit, and the sliding section of the valve body cooperates with the sliding section of the valve piston to achieve motion guidance or position limiting of the valve piston. It can be seen that within the entire range of the motion stroke of the valve piston, these functional sections cooperate at least partially accordingly. For example, the valve body is formed with a flange portion 152 of a larger diameter, which is arranged in a valve housing to be described later and abuts against the coil support. The valve body area where the flange portion is located is a magnetic conductive area, which cooperates with the second magnetic conductive section of the valve piston to achieve magnetic conductivity, and a sliding area is constructed in the valve body opening area, which cooperates with the second sliding section or the second sliding surface of the valve piston to achieve motion guidance.

[0039] Similarly, the diameter of the magnetic conductive section of the valve body is set to be larger than the diameter of the sliding section, so that the magnetic conductive section will not participate in the movement guidance of the valve piston, realizing functional division. The inner surface of the sliding section of the valve body can also be surface treated similarly to the sliding surface to improve wear resistance and reduce magnetic conductivity.

[0040] To prevent magnetic short circuit, in some embodiments of the present disclosure, the solenoid valve 1 also includes a magnetic circuit isolator 16, which is arranged between the static iron core 12 and the valve body 15 in the axial direction of the valve piston 11, and the magnetic circuit isolator 16 is constructed with a guide portion 161, which cooperates with the sliding surface to guide the stroke movement of the valve piston 11, and the magnetic circuit isolator 16 hinders the magnetic circuit of the solenoid valve 1 from being guided from the valve body 15 to the static iron core 12 via the magnetic circuit isolator 16.

[0041] The magnetic circuit isolator can be constructed as a hollow rotating body, and the cavity formed by the hollow part is used to arrange a part of the valve piston and the static iron core. Those skilled in the art know that various materials can be used to make the magnetic circuit isolator to achieve magnetic circuit isolation. For example, the magnetic circuit isolator is made of austenitic stainless steel, which has the characteristics of excellent corrosion resistance, good mechanical properties, good processing performance, good heat resistance, etc. In addition, it is also possible to consider using ferrites, nickel alloys, non-metallic materials (such as synthetic materials), etc. to manufacture the magnetic circuit isolator.

[0042] Correspondingly, the guide portion of the magnetic circuit isolator can be made of the same or similar material as the sliding surface of the valve piston, such as a material with poor magnetic conductivity or no magnetic conductivity. A carburized layer can also be applied through heat treatment, thereby improving the sliding wear resistance while further isolating the magnetic circuit. It can be seen that the magnetic circuit isolator is also used as a guide sleeve for the valve piston to slide up and down. Overall, the magnetic circuit of the solenoid valve will be guided through the valve body, the magnetic conductive section of the valve piston, and the sliding section, through the air gap between the static iron core and the valve piston and enter the static iron core, finally forming a closed magnetic circuit.

[0043] In order to further improve the response speed of the valve piston, combined with Figure 1 and Figure 2 The valve piston 11 is provided with a through hole 116 that penetrates along its axial direction. In other words, the through hole connects the cavity between the static iron core and the upper part of the valve piston with the cavity between the lower part of the valve piston and the valve body and the valve seat, so that the air pressure of the two cavities is consistent, and the upper and lower pressures are balanced, which is equivalent to no resistance, thereby improving the action response speed of the valve piston. Figure 2 In the embodiment shown, the valve piston is divided into two parts, the upper and lower parts, due to the design of the recessed part. Through holes can be opened in the two parts respectively, and the two cavities mentioned above and the cavity where the recessed part is located are opened, which can also achieve comparable technical effects. See also Figure 3 In addition, the present disclosure does not impose any special restrictions on the size, number, shape, and position of the through holes. For example, in this example, four through holes are provided, two of which are evenly distributed in the upper and lower halves of the valve piston and aligned with each other.

[0044] Combination Figure 4 and Figure 5 ,in, Figure 4 A cross-sectional schematic diagram of a valve core according to the present disclosure is shown; and Figure 5 A cross-sectional schematic diagram of a coil assembly according to the present disclosure is shown.

[0045] The solenoid valve 1 also includes: a valve seat 17, which is arranged at one end of the valve body 15. When in the closed position, the valve piston 11 abuts against the valve seat 17 and blocks the fluid in the valve body 15 from flowing out through the outlet 171 of the valve seat 17; a valve housing 18, and an electrical connector 181 is arranged at the end of the valve housing 18 for supplying power to the solenoid valve 1; a coil support 19, which is arranged in the valve housing 18 and forms a accommodating chamber 191; a coil 20, which is supported by the coil support 19 and arranged in an arrangement space formed by the coil support 19 and the valve housing 18. Among them, the valve piston 11, the static iron core 12, the return spring 13, the spring seat 14, the valve body 15, the magnetic circuit isolator 16 and the valve seat 17 can be assembled into the valve core VC (Valve Core) of the solenoid valve 1, the valve housing 18, the coil support 19 and the coil 20 can be assembled into the coil assembly CA (Coil Assembly) of the solenoid valve 1, and the valve core VC is at least partially arranged in the accommodating chamber 191 of the coil support 19 of the coil assembly CA.

[0046] This technical solution expresses an integrated installation method of the solenoid valve. It should be understood that the valve seat can be constructed as a hollow rotating body, and the hollow part can form an outlet for the fluid to flow out. The valve seat is exemplarily made of plastic and is well sealed with the valve body. Overall, the valve seat and the valve body form a part of the lower end of the solenoid valve. The valve housing is a magnetic conductive housing, and the electrical connector therein is used to energize the coil, and the energizing current of the coil determines the opening of the valve piston. Viewed in the radial direction, the magnetic circuit isolator is arranged between the coil support and the valve piston.

[0047] In the present design, the assembly form of the valve core and the coil assembly is particularly limited, and the two can be understood as a separate modular design, which is convenient for the layout design, assembly and maintenance of the solenoid valve. In addition, this design method also takes into account the functionality of the valve core and the coil assembly, can optimize performance and control, and has strong adaptability, which is convenient for flexible configuration according to needs. In terms of the assembly of the two, illustratively, the upper end face of the static iron core abuts against the upper inner wall of the valve housing, the static iron core, the magnetic circuit isolator and a part of the valve body abut against the inner wall of the coil support, and the upper end face of the flange portion of the valve body abuts against the lower end face of the coil support in the axial direction and abuts against the inner wall of the valve housing in the radial direction. Overall, the solenoid valve has a compact structure, fewer parts, low cost and high cost performance.

[0048] According to another aspect of the present disclosure, the present disclosure also relates to a thermal management system for a vehicle, wherein the thermal management system includes any of the above-mentioned solenoid valves 1. It can be understood that the thermal management system of the vehicle includes a battery-side thermal management system and a cabin-side or air-conditioning-side thermal management system. The solenoid valve of the present disclosure can be well suited for use in these thermal management systems, for example, for regulating the flow of refrigerant or refrigerant. As an example, in the thermal management system on the air-conditioning side of the vehicle, a number of solenoid valves of the present disclosure are provided, which are arranged between the LCC (liquid-cooled condenser) and the condenser of the thermal management system; arranged upstream of the evaporator; and arranged upstream of the Chiller (cooler), etc., thereby greatly reducing the cost of the entire system and having significantly improved performance, ensuring market competitiveness. Among them, Chiller and LCC can be two major components shared by the air-conditioning side and the battery side of the thermal management system. It can also be understood that the solenoid valve explained in the present disclosure can also be used in other air-conditioning systems, or broadly speaking, can be used in occasions or fields where flow regulation is required.

[0049] It should be understood that all of the above preferred embodiments are illustrative rather than restrictive, and that various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present disclosure should be within the legal protection scope of the present disclosure.

Claims

1. A solenoid valve (1), characterized in that: The solenoid valve (1) comprises a valve piston (11), wherein the valve piston (11) performs a stroke movement in response to the current of the solenoid valve (1) and defines an open position and a closed position of the solenoid valve (1), wherein the valve piston (11) comprises a magnetic conductive section and a sliding section, wherein the surface of the sliding section is provided with a sliding surface, wherein the magnetic permeability of the sliding surface is lower than that of the magnetic conductive section and is used to guide the stroke movement of the valve piston (11).

2. The solenoid valve (1) according to claim 1, characterized in that: The sliding surface is configured with a heat-treated portion, and / or the diameter of the magnetic conductive section is smaller than the diameter of the sliding section.

3. The solenoid valve (1) according to claim 1, characterized in that: The magnetic conductive section comprises a first magnetic conductive section (111) and a second magnetic conductive section (112); the sliding section comprises a first sliding section (113) and a second sliding section (114); the first magnetic conductive section (111), the first sliding section (113), the second magnetic conductive section (112) and the second sliding section (114) are arranged in sequence in the axial direction of the valve piston (11), and the first sliding section (113) is arranged at the upper half of the valve piston (11).

4. The solenoid valve (1) according to claim 1, characterized in that: The valve piston (11) is provided with a recessed portion (115), which extends inward from the outer periphery of the valve piston (11) and respectively connects the magnetic conductive section and the sliding section in the axial direction of the valve piston (11).

5. The solenoid valve (1) according to claim 1, characterized in that: The solenoid valve (1) also includes a magnetically conductive static iron core (12), a return spring (13) arranged inside the static iron core (12), and a spring seat (14) whose magnetic conductivity is lower than that of the magnetic conductive section. The return spring (13) is used to apply a spring force in the direction of the closed position to the valve piston (11). The spring seat (14) is arranged at the upper end of the valve piston (11) and extends upward beyond the upper end of the valve piston (11) in the axial direction of the valve piston (11). In the open position, the spring seat (14) abuts against the static iron core (12), and the valve piston (11) is spaced apart from the static iron core (12).

6. The solenoid valve (1) according to claim 5, characterized in that The solenoid valve (1) further comprises a valve body (15), the valve piston (11) being slidably arranged in the valve body (15) and being capable of controlling the flow rate of a fluid flowing through the valve body (15), the valve body (15) being provided with a magnetic conductive section and a sliding section, the diameter of the magnetic conductive section being larger than the diameter of the sliding section, and the magnetic conductive section and the sliding section and the sliding section at least partially always cooperate with each other throughout the entire movement stroke of the valve piston (11).

7. The solenoid valve (1) according to claim 6, characterized in that The solenoid valve (1) also includes a magnetic circuit isolator (16), which is arranged between the static iron core (12) and the valve body (15) in the axial direction of the valve piston (11), and the magnetic circuit isolator (16) is constructed with a guide portion (161), and the guide portion (161) cooperates with the sliding surface to guide the stroke movement of the valve piston (11). The magnetic circuit isolator (16) prevents the magnetic circuit of the solenoid valve (1) from being guided from the valve body (15) to the static iron core (12) via the magnetic circuit isolator (16).

8. The solenoid valve (1) according to claim 1, characterized in that: The valve piston (11) is provided with a through hole (116) which penetrates along its axial direction.

9. The solenoid valve (1) according to claim 7, characterized in that: The solenoid valve (1) further comprises: a valve seat (17) arranged at one end of the valve body (15); in the closed position, the valve piston (11) abuts against the valve seat (17) and blocks the fluid in the valve body (15) from flowing out through the outlet (171) of the valve seat (17); A valve housing (18), wherein an electrical connector (181) is arranged at an end of the valve housing (18) for supplying power to the solenoid valve (1); A coil support (19) arranged in the valve housing (18) and forming a receiving chamber (191); a coil (20) supported by the coil support (19) and arranged in an arrangement space formed by the coil support (19) and the valve housing (18), The valve piston (11), the static iron core (12), the return spring (13), the spring seat (14), the valve body (15), the magnetic circuit isolator (16) and the valve seat (17) can be assembled into the valve core (VC) of the solenoid valve (1); the valve housing (18), the coil support (19) and the coil (20) can be assembled into the coil assembly (CA) of the solenoid valve (1); the valve core (VC) is at least partially arranged in the accommodating chamber (191) of the coil support (19) of the coil assembly (CA).

10. A thermal management system for a vehicle, characterized in that: The thermal management system comprises a solenoid valve (1) according to any one of claims 1 to 9.

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