Solenoid valve

Abstract

Exemplary embodiments of the present disclosure relate to a solenoid valve. The solenoid valve includes: a valve seat; the fixed iron core section is arranged on one side, opposite to the valve seat, of the electromagnetic valve; the iron core can move away from the valve seat under the action of a magnetic field in the axial direction of the electromagnetic valve; a closing body capable of abutting against or disengaging from the valve seat; wherein in a first phase in which the iron core moves away from the valve seat, the iron core does not exert a force away from the valve seat on the closing body, and in a second phase following the first phase, the iron core interacts with the closing body and drives the closing body to separate from the valve seat and move together away from the valve seat, the side, away from the valve seat, of the iron core is provided with an iron core first surface, and when the iron core first surface abuts against the fixed iron core section, the distance between the closing body first surface of the closing body and the fixed iron core section under the action of a magnetic field is smaller than a threshold value, so that a gap is kept between the closing body and the valve seat.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure generally relate to the field of valve technology, and more particularly to a solenoid valve applied to an air supply system of an air spring of a vehicle. Background Art

[0002] The air suspension system is a vehicle suspension system. In the air suspension system, the air spring is used as an elastic element, which can adjust the height of the air suspension by inflating and deflating, thereby changing the height or posture of the vehicle body to improve the vehicle's ride smoothness and handling stability. At the same time, the air suspension can also manually adjust the height and posture of the vehicle body according to the driver's intention and driving status, providing a more personalized driving experience. Compared with traditional coil springs used in vehicles, air springs are lightweight and can improve the vehicle's energy efficiency, comfort and handling.

[0003] In short, air suspension is an important component that can improve the vehicle's ride smoothness, handling stability, comfort and passability, and is of great significance to improving the quality and performance of the vehicle. Therefore, more and more vehicles are equipped with air suspension systems.

[0004] In order to adapt to more variable road conditions, lower energy consumption, and improve the car's passability and ride comfort, the solenoid valve in the air spring air supply system is required to have faster response, lower wear, and better performance under high pressure. The existing methods cannot meet the above requirements. Therefore, there is an urgent need for an improved solenoid valve that can achieve the above effects, thereby improving the response level of the solenoid valve. Utility Model Content

[0005] To at least overcome the problems existing in the existing solenoid valves and / or other potential problems, an example embodiment of the present disclosure provides a solenoid valve.

[0006] The solenoid valve according to the embodiment of the present disclosure includes: a valve seat; a fixed iron core segment, which is arranged on the side of the solenoid valve opposite to the valve seat; an iron core, which can move away from the valve seat along the axial direction of the solenoid valve under the action of a magnetic field; and a closing body, which can abut against the valve seat or detach from the valve seat; wherein in a first stage of the movement of the iron core away from the valve seat, the iron core does not apply a force to the closing body to move away from the valve seat, and in a second stage after the first stage, the iron core interacts with the closing body and drives the closing body to detach from the valve seat and move away from the valve seat together, wherein the closing body has a first closing body surface on the side away from the valve seat, and the iron core has a first iron core surface on the side away from the valve seat, and wherein when the first iron core surface abuts against the fixed iron core segment, the distance between the first closing body surface of the closing body and the fixed iron core segment under the action of the magnetic field is less than a threshold value, so that a gap is maintained between the closing body and the valve seat.

[0007] According to an embodiment of the present disclosure, when the solenoid valve is opened, the closing body is attracted by the fixed iron core segment of the solenoid valve under the action of the magnetic field, so that the gap opening between the closing body and the valve seat is kept at the maximum, thereby increasing the design flow rate of the solenoid valve.

[0008] In some embodiments, the solenoid valve further includes a magnetic isolation section, adjacent to the fixed core section; and a magnetic conductive section, adjacent to the magnetic isolation section and abutting against the valve seat, the magnetic conductive section having a thickness greater than that of the magnetic isolation section. In some embodiments, the fixed core section, the magnetic isolation section and the magnetic conductive section are integrally formed. In this way, the one-piece housing design greatly reduces the number of parts and the assembly process, greatly reduces costs, and also improves the precision of parts and the consistency of products.

[0009] In some embodiments, the magnetic isolation section is formed separately from the fixed iron core section and the magnetic conductive section. In this way, the solenoid valve can be applied to more usage scenarios.

[0010] In some embodiments, there is a radial gap between the iron core and the magnetic conductive section, and the outer surface of the iron core is provided with a plurality of grooves extending along the axial direction of the solenoid valve, wherein the solenoid valve further comprises a ball capable of rolling in the groove. In this way, the movement of the iron core is converted into rolling friction by using the ball, thereby greatly reducing the wear during movement, improving the reliability of the product, and further improving the response level of the solenoid valve.

[0011] In some embodiments, a plurality of the grooves are evenly distributed along the outer surface. In this way, structural reliability can be improved and manufacturing is easy.

[0012] In some embodiments, a blocking portion is provided in the groove, the blocking portion protruding inward from the wall of the groove, and used to limit the movement of the ball along the axial direction of the solenoid valve. In this way, it is possible to avoid the ball sliding out of the groove to cause movement failure.

[0013] In some embodiments, there is a radial gap between the iron core and the magnetic conductive section, and the outer surface of the iron core is provided with a plurality of grooves extending along the radial direction of the solenoid valve, wherein the solenoid valve further comprises balls rolling in the grooves. In this way, users can be given more choices and more types of solenoid valves can be configured according to different design requirements.

[0014] The solenoid valve further includes a compression spring, which is disposed between the iron core and the fixed iron core segment and is configured to be compressed when the iron core moves away from the valve seat, and to apply an elastic restoring force to the valve seat when the iron core moves toward the valve seat. In this way, the preload force and elastic restoring force of the compression spring can be used to ensure that the medium passage is effectively opened and closed.

[0015] In some embodiments, the solenoid valve further includes an axial medium exchange channel disposed in the valve seat and a lateral medium exchange channel disposed near the valve seat, wherein the closing body is configured to: block the axial medium exchange channel to shut off the medium passage between the axial medium exchange channel and the lateral medium exchange channel when abutting against the valve seat, and not block the axial medium exchange channel to establish the medium passage between the axial medium exchange channel and the lateral medium exchange channel when detaching from the valve seat. In this way, the opening and closing of the medium passage can be conveniently controlled, thereby realizing flexible adjustment of the solenoid valve.

[0016] These and other aspects of the present disclosure will become more apparent from the following description of the embodiment(s). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] In the attached picture:

[0019] Figures 1A to 1C shows a cross-sectional view of a solenoid valve according to an exemplary embodiment of the present disclosure in different working states;

[0020] FIG. 2A to FIG. 2C They are Figures 1A to 1C an enlarged view of a portion of;

[0021] Figure 3 A feasible alternative solution of the solenoid valve according to the embodiment of the present disclosure is shown, wherein the magnetic isolation section, the fixed iron core section and the magnetic conductive section are integrated to form the shell of the solenoid valve, and the iron core slides and rubs in the shell;

[0022] Figure 4 Another feasible alternative of the solenoid valve according to the embodiment of the present disclosure is shown, wherein the magnetic isolation section, the fixed iron core section and the magnetic conductive section are separated to form the shell of the solenoid valve, and the iron core rolls and rubs in the shell;

[0023] Figure 5 Another feasible alternative of the solenoid valve according to the embodiment of the present disclosure is shown, wherein the magnetic isolation section, the fixed iron core section and the magnetic conductive section are separated to form the shell of the solenoid valve, and the iron core slides and rubs in the shell; and

[0024] Figure 6 Still another possible alternative of the solenoid valve according to the embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0025] The principles of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described only for illustrative purposes and to help those skilled in the art understand and implement the present disclosure without implying any limitation on the scope of the present disclosure. In addition to the methods described below, the disclosure described herein can be implemented in various ways.

[0026] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0027] References in this disclosure to "one embodiment", "embodiment", "example embodiment", etc. indicate that the described embodiment may include specific features, structures, or characteristics, but not every embodiment must include the specific features, structures, or characteristics. In addition, these phrases do not necessarily refer to the same embodiment. In addition, when specific features, structures, or characteristics are described in conjunction with an embodiment, those skilled in the art believe that it is within the knowledge of those skilled in the art to apply such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0028] It should be understood that although the terms "first" and "second", etc. may be used to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the exemplary embodiments. The term "and / or" as used herein includes any and all combinations of one or more of the listed terms.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The terms used herein are only used for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments. As used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprise", "include", "have", "have", "include" and / or "include" when used herein, indicate the presence of the features, elements and / or components, etc., but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0031] As mentioned above, more and more vehicles are equipped with air spring systems. The air spring system is provided with a solenoid valve, which is installed in the air circuit of the air spring system to control the connection and disconnection of the air circuit. The existing battery valve has some shortcomings, such as the slow opening response of the solenoid valve and the large opening current, which leads to high energy consumption of the solenoid valve.

[0032] In order to at least solve the above problems, an embodiment of the present disclosure provides a solenoid valve for an air spring system of a vehicle. Figures 1A to 6 The specific structure of the solenoid valve 1 according to the embodiment of the present disclosure will be described.

[0033] Figures 1A to 1C FIG. 1 shows a cross-sectional view of a solenoid valve 1 according to an exemplary embodiment of the present disclosure, which respectively shows different working states of the solenoid valve 1. First, referring to FIG. Figure 1A , which shows a cross-sectional view of the solenoid valve 1 in a power-off state. As shown, the solenoid valve 1 includes a housing 10 located outside. The housing 10 of the solenoid valve 1 generally includes a fixed core segment 11 located at the end of the solenoid valve 1, a magnetic isolation segment 12 connected to the fixed core segment 11, and a magnetic conductive segment 13 connected to the magnetic isolation segment 12, wherein the thickness of the magnetic conductive segment 13 is greater than the thickness of the magnetic isolation segment 12. Figure 1A As shown, the fixed core segment 11, the magnetic isolation segment 12 and the magnetic conductive segment 13 are sequentially arranged along the axial direction. In the embodiment shown in FIG1 , the fixed core segment 11, the magnetic isolation segment 12 and the magnetic conductive segment 13 are formed in one piece, and together constitute the housing 10 of the solenoid valve 1. In such a setting, the magnetic saturation principle of the thin-wall structure is used to achieve the magnetic isolation effect. The one-piece structure helps to ensure the reliability of the housing 10 of the solenoid valve. Compared with the existing design that requires multiple parts to be welded to form the housing, according to the embodiment of the present disclosure, only a single part is needed to achieve upper and lower magnetic conductivity and middle magnetic isolation, which greatly reduces costs. In addition, the housing 10 formed in one piece can also avoid the sealing problem caused by welds during the assembly of multiple parts, and can also overcome the coaxiality problem during the assembly process.

[0034] Continue to refer Figure 1A The solenoid valve 1 further includes a valve seat 20 at the other end thereof, and the valve seat 20 is axially opposite to the fixed core segment 11. In some embodiments, the valve seat 20 may be made of plastic material and may be mounted on the sleeve 14 by injection molding. It should be noted that the connection methods between the components listed here are merely exemplary and non-restrictive. Based on actual usage scenarios and design requirements, those skilled in the art may also conceive of other processes to achieve the connection between the components.

[0035] like Figure 1AAs shown, the solenoid valve 1 is provided with an axial medium exchange channel 80 and a lateral medium exchange channel 90, wherein the axial medium exchange channel 80 is provided in the valve seat 20 located in the solenoid valve 1, and the lateral medium exchange channel 90 is provided in the sleeve 14 of the solenoid valve 1. The axial medium exchange channel 80 and the lateral medium exchange channel 90 can be connected to the air pipeline (not shown) of the air spring system. The solenoid valve 1 also includes a closing body 50, which can move back and forth in the axial direction of the solenoid valve 1 (i.e., along the direction of the solenoid valve 1). Figure 1A The opening and closing of the gas path between the axial medium exchange channel 80 and the lateral medium exchange channel 90 are controlled.

[0036] Figure 1B It shows a cross-sectional view of the solenoid valve 1 when it is powered on but the gas path between the axial medium exchange channel 80 and the lateral medium exchange channel 90 remains closed. Figure 1C FIG. 1 shows a cross-sectional view of the solenoid valve 1 when it is powered on and the medium passage between the axial medium exchange channel 80 and the lateral medium exchange channel 90 is open. Figures 1A to 1C As shown, a seal 59 is provided at the end of the closing body 50. In some embodiments, the seal 59 can be made of a rubber material. Figure 1A and Figure 1B In the state shown, the seal 59 abuts against the valve seat 20, and since the axial medium exchange channel 80 is blocked, the medium passage between the axial medium exchange channel 80 and the lateral medium exchange channel 90 is blocked. Figure 1C In the embodiment, as the main body of the closing body 50 moves along the axial direction L1, the sealing member 59 is separated from the valve seat 20, and the axial medium exchange channel 80 is no longer blocked. Therefore, the gas as the medium can enter the internal space S of the solenoid valve 1 from the axial medium exchange channel 80 and leave from the lateral medium exchange channel 90, thereby establishing a gas path between the axial medium exchange channel 80 and the lateral medium exchange channel 90. It should be noted that the gas path between the axial medium exchange channel 80 and the lateral medium exchange channel 90 is bidirectional. In other embodiments, the medium can also flow from the lateral medium exchange channel 90 into the internal space S of the solenoid valve 1 and leave from the axial medium exchange channel 80, thereby establishing a medium path from the lateral medium exchange channel 90 to the axial medium exchange channel 80. The embodiments of the present disclosure do not limit the flow direction of the medium.

[0037] In the solenoid valve 1 according to the embodiment of the present disclosure, the opening and closing of the medium passage is achieved by the movement of the closing body 50 along the axial directions L1 and L2. Furthermore, the movement of the closing body 50 is driven by the iron core 30, and the movement of the iron core 30 is achieved by the magnetic force with the external coil 2. This will be described in detail below.

[0038] like Figures 1A to 1C As shown, the iron core 30 is arranged between the fixed iron core segment 11 and the valve seat 20. The external coil 2 can be energized in response to a signal from the outside. Under the electromagnetic action, the iron core 30 can move along the axial direction L1 toward the fixed iron core segment 11 (that is, away from the valve seat 20). According to the embodiment of the present disclosure, during the use of the solenoid valve 1, the integrally formed shell 10 has no assembly welds, which can guide the movement of the iron core 30 and avoid problems such as the iron core 30 getting stuck during the movement.

[0039] Refer to the following FIG. 2A to FIG. 2C The interaction between the core 30 and the closing body 50 is described in detail. FIG. 2A to FIG. 2C They are Figures 1A to 1C A magnified view of a portion of the.

[0040] like FIG. 2A to FIG. 2C As shown, the outer surface 55 of the closing body 50 is provided with a first groove 51, and the inner surface 37 of the iron core 30 is adjacent to the outer surface 55 of the closing body 50. A second groove 32 is provided on the inner surface 37 of the iron core 30, and the second groove 32 is connected to the first groove 51, so as to accommodate the clamping ring 60. The clamping ring 60 is sleeved between the iron core 30 and the closing body 50 in the circumferential direction of the solenoid valve 1, so as to play a role in force transmission between the two. FIG. 2A to FIG. 2C As shown, the first groove 51 includes an upper end surface 511 and a lower end surface 512 , and the second groove 32 includes an upper end surface 321 and a lower end surface 322 .

[0041] like Figure 1A As shown, the solenoid valve 1 also includes a compression spring 40 arranged between the iron core 30 and the fixed iron core segment 11, and the compression spring 40 is configured to be compressed when the iron core 30 moves away from the valve seat 20, and to apply an elastic restoring force to the valve seat 20 when the iron core 30 moves toward the valve seat 20.

[0042] Refer to the following FIG. 2A to FIG. 2C Combined with Figures 1A to 1C The working process of the solenoid valve 1 from the power-off state to the power-on state is described in detail.

[0043] First reference Figure 1A and Figure 2A, at this time, the external coil 2 is not energized, and the solenoid valve 1 is also in a power-off state. At this time, the compression spring 40 is squeezed by the fixed core segment 11 and the core 30 and has a certain preload force, which acts on the core 30. Through the abutment between the protrusion 300 of the core 30 and the protrusion 500 of the closing body 50, the elastic preload force of the compression spring 40 can be transmitted from the core 30 to the closing body 50, thereby ensuring that the seal 59 at the end of the closing body 50 is tightly against the valve seat 20 at this time to block the axial medium exchange channel 80. At this time, the medium passage between the axial medium exchange channel 80 and the lateral medium exchange channel 90 is cut off. Therefore, the solenoid valve 1 according to the embodiment of the present disclosure is a normally closed valve, and the medium passage is closed when the solenoid valve 1 is not energized.

[0044] Subsequently, under the stimulation of the external signal, the external coil 2 is energized to generate a magnetic field. Under the electromagnetic action, the iron core 30 first begins to move along the axial direction L1 toward the fixed iron core segment 11 (that is, away from the valve seat 20), and the protrusion 300 of the iron core 30 begins to lose contact with the protrusion 500 of the closing body 50. At this time, refer to Figure 2A Since the lower end surface 322 of the second groove 32 of the iron core 30 is at a certain axial distance from the lower surface of the clamping ring 60, the iron core 30 does not apply an axial force toward the fixed iron core segment 11 (that is, away from the valve seat 20) to the clamping ring 60 at the beginning of the stroke of the iron core 30, resulting in the iron core 30 not applying an axial force toward the fixed iron core segment 11 to the closing body 50.

[0045] As the core 30 continues to move upward along the direction indicated by L1, the axial distance between the lower end surface 322 of the second groove 32 of the core 30 and the lower surface of the collar 60 gradually decreases, and finally the lower end surface 322 contacts the lower surface of the collar 60, as shown in FIG. Figure 1B and Figure 2B As shown. At this time, the iron core 30 and the collar 60 begin to interact with each other, which leads to the iron core 30 and the closing body 50 also beginning to interact with each other. Therefore, in the early stage of the travel of the iron core 30 (i.e., the first stage), the iron core 30 does not apply an axial force toward the fixed iron core segment 11 to the closing body 50, so this travel can be regarded as a low-load travel segment. Figure 2B As shown, the distance between the lower end surface 322 of the second groove 32 of the core 30 and the upper end surface 511 of the first groove 51 is greater than the cross-sectional diameter (ie, wire diameter) of the collar 60. The difference between the two is the length of the low-load stroke section.

[0046] In such Figure 1B and Figure 2BAfter the moment shown, the travel of the iron core 30 enters the second stage. As the iron core 30 continues to move upward along the direction shown by L1, the lower end surface 322 of the second groove 32 of the iron core 30 begins to squeeze the lower surface of the clamping ring 60. Under this squeezing action, the upper surface of the clamping ring 60 also transmits the squeezing force to the upper end surface 511 of the first groove 51 of the closing body 50, and the closing body 50 and the clamping ring 60 move together with the iron core 30. In other words, the clamping ring 60 acts as a transmission component to transmit force between the iron core 30 and the closing body 50. Under the transmission action of the clamping ring 60, the iron core 30 can drive the closing body 50 to leave the valve seat 20, so that the axial medium exchange channel 80 is no longer blocked by the closing body 50. Therefore, the medium can enter the internal space S of the solenoid valve 1 from the axial medium exchange channel 80 and leave from the lateral medium exchange channel 90, or enter the internal space S of the solenoid valve 1 from the lateral medium exchange channel 90 and leave from the axial medium exchange channel 80, thereby establishing an air path between the axial medium exchange channel 80 and the lateral medium exchange channel 90.

[0047] According to an embodiment of the present disclosure, during the opening process of the solenoid valve 1, a low-load stroke section is set in the first stage of the stroke of the iron core 30. In this low-load stroke section, since the iron core 30 does not need to drive the closing body 50 to move together, the movement of the iron core 30 only needs to overcome the elastic preload of the spring without considering the inherent forces such as self-gravity and motion friction. This design has a beneficial technical effect when the solenoid valve 1 is radially pressurized (the medium flows in from the lateral medium exchange channel 90). When radial pressurization is applied and the solenoid valve 1 is powered off, the medium flows into the solenoid valve 1 through the lateral medium exchange channel 90 and flows to the axial medium exchange channel 80, and the flow direction of the medium in the solenoid valve 1 is along L2 toward the axial medium exchange channel 80 (that is, away from the opening direction L1 of the solenoid valve 1). In this case, the closing body 50 will be subjected to the air pressure along L2, which is a resistance to the opening of the solenoid valve 1, and the greater the air pressure, the greater the air pressure resistance. If a low-load stroke section is not designed, at this time, if one wants to make the seal 59 of the closing body 50 leave the valve seat 20 to open the solenoid valve 1, the opening response may be slow due to excessive air pressure, and it may even cause the electromagnetic force of the iron core 30 to be insufficient to overcome the air pressure resistance and cause the seal 59 of the closing body 50 to leave the valve seat 20, thereby causing the solenoid valve 1 to fail to work normally.

[0048] According to the embodiment of the present disclosure, since a low-load stroke section is provided in the first stage of the movement of the iron core 30, the iron core 30 only needs to overcome the elastic preload force of the compression spring 40 in the low-load stroke section, and when the iron core 30 completes the low-load stroke section and applies an axial force to the closing body 50 via the clamp ring 60, the iron core 30 is very close to the end face 15 of the fixed iron core section 11, and the iron core 30 can obtain a larger electromagnetic force from the fixed iron core section 11 at this time, thereby helping to drive the closing body 50 away from the valve seat 20 with a larger electromagnetic force. In addition, since the closing body 50 already has a certain impulse at this time, it is also easier to be lifted away from the valve seat 20, thereby reducing the opening response time. Therefore, according to the embodiment of the present disclosure, by providing a low-load stroke section in the movement stroke of the iron core 30, the closing body 50 can be easily disengaged from the valve seat 20 without increasing the electromagnetic excitation, so that the medium can enter the internal space S of the solenoid valve 1 to establish a medium passage between the lateral medium exchange channel 90 and the axial medium exchange channel 80. In this way, since there is no need to increase the electromagnetic excitation, reliable operation of the solenoid valve 1 can be ensured without increasing the energy consumption.

[0049] refer to Figure 1C and Figure 2C When the closing body 50 is completely separated from the valve seat 20 to open the solenoid valve 1, due to the low-load stroke section, the closing body 50 may be unable to fully fit with the protrusion 300 of the iron core 30 due to its own gravity, thereby affecting the opening of the solenoid valve 1.

[0050] like Figure 1A As shown in FIG. 1 , the closing body 50 has a closing body first surface 51 on the side away from the valve seat 20, and the iron core 30 has an iron core first surface 31 on the side away from the valve seat 20. The distance between the closing body first surface 51 and the iron core first surface 31 is set within a predetermined range, so that when the iron core first surface 31 abuts against the fixed iron core segment 11 (such as Figure 1C As shown in FIG. 1 , the distance between the first surface 51 of the closing body 50 and the fixed core segment 11 under the action of the magnetic field is less than a threshold value, so that a gap is maintained between the closing body 50 and the valve seat 20 .

[0051] exist Figure 1C In the illustrated embodiment, when the first surface 31 of the core abuts against the fixed core segment 11, the first surface 51 of the closing body also abuts against the fixed core segment 11. In other words, at this time, the first surface 31 of the core and the first surface 51 of the closing body can be flush. It should be understood that this is only one embodiment, and in other embodiments, when the first surface 31 of the core abuts against the fixed core segment 11, the first surface 51 of the closing body can also be separated from the surface of the fixed core segment 11 by a certain distance, but the distance is less than a certain threshold value to ensure that the magnetic force between the fixed core segment 11 and the closing body 50 is sufficient to be greater than the gravity of the closing body 50 itself.

[0052] Through the above arrangement, relying on the attraction of the fixed core segment 11 to the closing body 50 under the action of the magnetic field, the protrusion 500 of the closing body 50 can be closely attached to the protrusion 300 of the core 30, thereby maintaining the maximum opening of the solenoid valve 1, thereby ensuring the maximum flow through the solenoid valve 1. According to the embodiment of the present disclosure, the solenoid valve 1 can be used in working conditions with a large gas flow. Moreover, according to the embodiment of the present disclosure, there is no need to set up an additional magnet but to use the existing components of the solenoid valve 1. By reasonably designing the distance between the first surface 31 of the core and the first surface 51 of the closing body, the magnetic force between the core segment 11 and the closing body 50 can meet the requirements, thereby avoiding the cost increase of the solenoid valve 1 caused by additional components.

[0053] Figures 3 to 5 sectional views of the solenoid valve 1 according to different exemplary embodiments of the present disclosure are shown respectively. Figure 4 or Figure 5 As shown, in an alternative embodiment, the magnetic isolation section 12 may also be formed separately from the fixed core section 11 and the magnetic conductive section 13. The split design enables the user to select a suitable solenoid valve 1 according to different needs and actual scenarios.

[0054] exist Figure 1A , Figure 2A , Figure 3 , Figure 5 In the illustrated embodiment, there is a radial gap G between the iron core 30 and the magnetic conductive section 13, and the outer surface of the iron core 30 is provided with a plurality of grooves 35 extending along the axial directions L1 and L2 of the electromagnetic valve 1, and the electromagnetic valve 1 also includes a ball 75 capable of rolling in the groove 35. Although the figure shows that there are two balls 75 in each groove 35, this is only for illustration. In other embodiments, other numbers of balls 75 may be provided, and the number is not limited to the embodiments of the present disclosure. In addition, the number of grooves 35 may be provided according to actual needs, such as two, three, four, five, or more. By providing the ball 75, when the iron core 30 moves along the axial direction of the electromagnetic valve 1, the friction pair between it and the magnetic conductive section 13 of the housing 10 is set to rolling friction, which greatly reduces the contact area, achieves low friction and low wear, and has higher reliability. Since the iron core 30 slides more smoothly, the level of rapid response of the electromagnetic valve 1 is further improved.

[0055] In further embodiments, these grooves 35 can be evenly distributed along the outer surface. However, this does not require that the angles between these grooves 35 must be strictly the same. In certain embodiments, there may be some differences in the angles between these grooves 35. Such embodiments also fall within the scope of the present disclosure.

[0056] In some embodiments, Figure 1A , Figure 2A , Figure 3 As shown, a blocking portion 36 may be provided in each groove 35, and the blocking portion 36 protrudes inward from the wall of the groove 35 to limit the movement of the ball 75 along the axial direction of the solenoid valve 1. In this way, it can be ensured that the ball 75 can be restricted to roll in the groove 35 without sliding out of the corresponding groove 35.

[0057] Figure 6 Another implementation of the groove and the ball is shown. Figure 6 In the illustrated embodiment, the outer surface of the iron core 30 is provided with a plurality of grooves 38 extending in the radial direction of the solenoid valve 1, and rolling balls 75 are provided in the grooves 38. In this way, the friction pair form of the iron core 30 can also be set to rolling friction, thereby greatly reducing the contact area, achieving low friction and low wear, and thus further improving the level of rapid response of the solenoid valve 1.

[0058] This solution innovates the dry friction commonly used in the existing armature on the market, which changes the sliding friction of the armature into rolling friction, greatly reduces the wear of the armature, improves the reliability of the solenoid valve, and reduces the resistance of the moving component during movement, further improving the response level; the parts of this solution are different from the existing commonly used solutions, and multiple parts are integrated, which not only reduces the number of parts but also further reduces the processing and assembly procedures, greatly reducing costs.

[0059] Although the embodiments of the present invention are described above using a vehicle air spring system as a scenario, it should be understood that the embodiments of the present invention can also be used in other scenarios and systems. It should also be understood that those skilled in the art can also conceive of other feasible ways of the solenoid valve without departing from the ideas of the present disclosure. Such embodiments also fall within the scope of the present invention.

[0060] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A solenoid valve (1), characterized in that: include: Valve seat (20); A fixed iron core segment (11) is arranged on a side of the solenoid valve (1) opposite to the valve seat (20); an iron core (30) capable of moving away from the valve seat (20) along the axial direction of the solenoid valve (1) under the action of a magnetic field; and A closing body (50) capable of abutting against the valve seat (20) or detaching from the valve seat (20); wherein in a first stage when the iron core (30) moves away from the valve seat (20), the iron core (30) does not exert a force on the closing body (50) to move away from the valve seat (20), and in a second stage after the first stage, the iron core (30) interacts with the closing body (50) and drives the closing body (50) to separate from the valve seat (20) and move away from the valve seat (20) together, The closing body (50) has a first closing body surface (51) on the side away from the valve seat (20), and the iron core (30) has a first iron core surface (31) on the side away from the valve seat (20), and when the first iron core surface (31) abuts against the fixed iron core segment (11), the distance between the first closing body surface (51) of the closing body (50) and the fixed iron core segment (11) is less than a threshold value under the action of the magnetic field, so that a gap is maintained between the closing body (50) and the valve seat (20).

2. The solenoid valve (1) according to claim 1, characterized in that: Also includes: a magnetic isolation section (12), adjacent to the fixed iron core section (11); and A magnetic conductive section (13) is adjacent to the magnetic isolation section (12) and abuts against the valve seat (20), and the magnetic conductive section (13) has a thickness greater than that of the magnetic isolation section (12).

3. The solenoid valve (1) according to claim 2, characterized in that: The fixed iron core segment (11), the magnetic isolation segment (12) and the magnetic conductive segment (13) are formed in one piece.

4. The solenoid valve (1) according to claim 2, characterized in that: The magnetic isolation section (12), the fixed iron core section (11) and the magnetic conductive section (13) are formed separately.

5. The solenoid valve (1) according to any one of claims 2 to 4, characterized in that: There is a radial gap (G) between the iron core (30) and the magnetic conductive section (13), and the outer surface of the iron core (30) is provided with a plurality of grooves (35) extending along the axial direction of the solenoid valve (1). The solenoid valve (1) further comprises a ball (75) capable of rolling in the groove (35).

6. The solenoid valve (1) according to claim 5, characterized in that A plurality of the grooves (35) are evenly distributed along the outer surface.

7. The solenoid valve (1) according to claim 5, characterized in that: A blocking portion (36) is provided in the groove (35), and the blocking portion (36) protrudes inward from the wall of the groove (35) and is used to limit the movement of the ball (75) along the axial direction of the solenoid valve (1).

8. The solenoid valve (1) according to any one of claims 2 to 4, characterized in that: There is a radial gap (G) between the iron core (30) and the magnetic conductive section (13), and the outer surface of the iron core (30) is provided with a plurality of grooves (38) extending in the radial direction of the solenoid valve (1). The solenoid valve (1) further comprises a ball (75) arranged to roll in the groove (38).

9. The solenoid valve (1) according to any one of claims 1 to 4, 6 to 7, characterized in that: It also includes a compression spring (40), which is arranged between the iron core (30) and the fixed iron core segment (11) and is configured to be compressed when the iron core (30) moves away from the valve seat (20) and to apply an elastic restoring force to the valve seat (20) when the iron core (30) moves toward the valve seat (20).

10. The solenoid valve (1) according to any one of claims 1-4, 6-7, characterized in that: The valve seat (20) further comprises an axial medium exchange channel (80) disposed in the valve seat (20) and a lateral medium exchange channel (90) disposed near the valve seat (20). The closing body (50) is configured to: block the axial medium exchange channel (80) when abutting against the valve seat (20) to shut off the medium passage between the axial medium exchange channel (80) and the lateral medium exchange channel (90); and not block the axial medium exchange channel (80) when detaching from the valve seat (20) to establish the medium passage between the axial medium exchange channel (80) and the lateral medium exchange channel (90).

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