Solenoid valve

Abstract

The invention relates to a solenoid valve. The electromagnetic valve comprises a fixing part, a valve rod and a sealing body. The fixing part comprises a valve seat and a fixed iron core. The valve rod can abut against the valve seat or be separated from the valve seat. The sealing body part is arranged on the axial outer side of the valve rod, and the fixed iron core part is arranged on the axial outer side of the sealing body part. The relative position of the sealing body and one of the fixing part and the valve rod is fixed, and the other one of the fixing part and the valve rod is provided with a receding structure. When the electromagnetic valve is not powered on, the valve rod is separated from the valve seat, and a gap exists between one part of the sealing body and the receding structure, so that a fluid medium can enter the gap. When the electromagnetic valve is powered on, the valve rod moves along the central axis to abut against the valve seat in response to the electromagnetic force of the electromagnetic valve, and a part of the sealing body abuts against the main body of the valve rod to prevent the fluid medium from entering the gap. According to the embodiment of the invention, the fluid pressure in the space in the sealing body can be effectively relieved, so that the movement of the valve rod is easier, and the response speed of the electromagnetic valve is improved.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure generally relate to the technical field of valves, and more particularly to a solenoid valve. Background Art

[0002] An air suspension damping system is a vehicle suspension system. In an air suspension damping system, there are multiple chambers, and there is a solenoid valve between these chambers, which is used to control the conduction and disconnection between adjacent chambers in these chambers by opening and closing the solenoid valve. According to the requirements of the air suspension damping system, it is necessary to ensure that the solenoid valve is not pushed open by the air pressure impact between the chambers in the closed state of the solenoid valve to avoid gas leakage between adjacent chambers. Therefore, high requirements are imposed on the sealing performance of the solenoid valve.

[0003] However, the existing sealing structures in solenoid valves still have deficiencies. For example, when the solenoid valve is energized and working, it is subject to large frictional forces, pressures and other movement resistances, resulting in problems such as slow closing response or even inability to close of the solenoid valve, thus affecting the performance of the solenoid valve and failing to meet the requirements of the air suspension damping system. Therefore, there is an urgent need for an optimized solenoid valve. Summary of the Invention

[0004] To at least overcome the problems existing in the existing solenoid valves and / or other potential problems, an exemplary embodiment of the present disclosure provides a solenoid valve.

[0005] An embodiment of the present disclosure relates to a solenoid valve. The solenoid valve includes a fixed part, including: a valve seat; and a fixed iron core, a valve rod, which can abut against the valve seat or disengage from the valve seat; a sealing body, which is partially arranged on the outer side of the axial direction of the valve rod, and the fixed iron core is partially arranged on the outer side of the axial direction of the sealing body; wherein the relative position of the sealing body with respect to one of the fixed part and the valve rod is fixed, and an avoidance structure is provided on the other of the fixed part and the valve rod. When the solenoid valve is not energized, the valve rod disengages from the valve seat, and there is a gap between a part of the sealing body and the avoidance structure, so that the fluid medium can enter the gap; and when the solenoid valve is energized, the valve rod moves along the central axis in response to the electromagnetic force of the solenoid valve to abut against the valve seat, and the part of the sealing body abuts against the main body of the valve rod to block the fluid medium from entering the gap.

[0006] According to the embodiment of the present disclosure, in a simple way, it is possible to effectively connect the space inside the sealing body with the space outside the sealing body when the solenoid valve is not energized, which helps to relieve the fluid pressure in the space inside the sealing body. In this way, the movement of the valve rod is easier. As a result, the response speed of the solenoid valve can be improved.

[0007] In some embodiments, the relative position of the seal body and the stationary iron core is fixed, and the clearance structure is a valve stem recess extending from at least a part of the outer periphery of the valve stem toward the central axis of the solenoid valve. With this embodiment, the valve stem recess can be reliably avoided from the seal body when necessary to achieve the communication between the space inside the seal body and the space outside the seal body.

[0008] In some embodiments, the valve stem recess is a recess extending around the entire outer periphery of the valve stem toward the central axis of the solenoid valve. With this embodiment, the valve stem recess can be realized in a simple and reliable manner.

[0009] In some embodiments, the valve stem recess is a groove extending from a part of the outer periphery of the valve stem toward the central axis of the solenoid valve. With this embodiment, the valve stem recess can be realized in a more diverse manner to expand its scope of use.

[0010] In some embodiments, the groove is formed by removing material from the part of the outer periphery of the valve stem in the radial direction of the valve stem. With this embodiment, the groove can be machined in a simple manner, thereby reducing costs.

[0011] In some embodiments, the valve stem recess is a keyway extending from a part of the outer periphery of the valve stem toward the central axis of the solenoid valve. With this embodiment, the valve stem recess can meet different usage scenarios to meet specific requirements.

[0012] In some embodiments, the keyway is formed by removing material from a part of the outer periphery of the valve stem in the tangential direction of the valve stem. With this embodiment, the groove can be machined in a simple manner, thereby reducing costs.

[0013] In some embodiments, the relative position of the seal body and the valve stem is fixed, and the clearance structure is a stationary iron core recess extending from at least a part of the inner periphery of the stationary iron core away from the central axis of the solenoid valve. With this embodiment, the seal body can be reliably avoided from the stationary iron core when necessary to achieve the communication between the space inside the seal body and the space outside the seal body.

[0014] In some embodiments, the stationary iron core recess is a groove extending from a part of the inner periphery of the stationary iron core away from the central axis of the solenoid valve. With this embodiment, the stationary iron core recess can be realized in a more diverse manner to expand its scope of use.

[0015] In some embodiments, the groove is formed by removing material from the part of the stationary iron core in the radial direction of the stationary iron core. With this embodiment, the groove can be machined in a simple manner, thereby reducing costs.

[0016] In some embodiments, the stator core recess is a recess extending away from the central axis of the solenoid valve around the entire inner circumference of the stator core. With this embodiment, the stator core recess can be realized in a simple and reliable manner.

[0017] In some embodiments, the valve stem includes an axial through-hole extending along the central axis of the solenoid valve.

[0018] These and other aspects of the present disclosure will become more readily apparent from the following description of the (several) embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for the embodiments. It should be understood that the following drawings only show certain embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Shows a cross-sectional view of a solenoid valve in an open state according to an exemplary embodiment of the present disclosure.

[0021] Figure 2 Shows a cross-sectional view of a solenoid valve in a closed state according to an exemplary embodiment of the present disclosure.

[0022] Figure 3 Shows Figure 1 A partial enlarged view of part C in

[0023] Figure 4 Shows Figure 2 A partial enlarged view of part C in

[0024] Figure 5 Shows Figure 3 and Figure 4 A perspective view of a schematic embodiment of the valve stem in

[0025] Figure 6 Shows a partial enlarged view of a solenoid valve according to another embodiment of the present disclosure.

[0026] Figure 7 Shows Figure 6 A perspective view of the valve stem in

[0027] Figure 8 Shows a partial enlarged view of a solenoid valve according to yet another embodiment of the present disclosure.

[0028] Figure 9 Shows Figure 8 A perspective view of the valve stem in

[0029] Figure 10 Shows a cross-sectional view of another solenoid valve in an open state according to an exemplary embodiment of the present disclosure.

[0030] Figure 11 Shows a cross-sectional view of another solenoid valve in a closed state according to an exemplary embodiment of the present disclosure.

[0031] Figure 12 Shows a partially enlarged view of a solenoid valve according to another embodiment of the present disclosure.

[0032] Figure 13 Shows Figure 12 a perspective view of the stationary iron core in

[0033] Figure 14 Shows a partially enlarged view of a solenoid valve according to yet another embodiment of the present disclosure.

[0034] In the respective drawings, the same reference numerals denote the same or corresponding components.

[0035] List of Reference Numerals 1 Solenoid valve 10 Sealing body 11 Sealing lip 20 Valve seat 21 Axial hole 22 Lateral hole 30 Solenoid 40 Armature 42 Armature shaft 50 Spring 60 Stationary iron core 64 Inner circumference 66 Groove 67 Recess 70 Valve stem 72 Axial through hole 74 Outer circumference 75 Depression 76 Groove 77 Keyway 770 Inner side A Chamber B Chamber L Central axis G Gap Detailed Description

[0036] The principles of the present disclosure will now be described with reference to some example embodiments. It should be understood that the description of these embodiments is for illustrative purposes only and helps those skilled in the art to understand and implement the present disclosure, without implying any limitation to the scope of the present disclosure. The disclosure described herein can be implemented in various ways other than those described below.

[0037] In the following description and claims, unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0038] References in the present disclosure to "one embodiment", "an embodiment", "example embodiment", etc., mean that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment must include the particular feature, structure, or characteristic. Moreover, these phrases do not necessarily refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, those skilled in the art will recognize that the application of such feature, structure, or characteristic in connection with other embodiments (whether or not explicitly described) is within the knowledge of those skilled in the art.

[0039] It should be understood that although terms such as "first" and "second", etc. may be used to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. 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 example embodiments. The term "and / or" used herein includes any and all combinations of one or more of the listed terms.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "arranged", "provided with", "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the example 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 "comprises", "comprising", "has", "having", "includes", and / or "including" when used herein, specify the presence of the stated features, elements, and / or components, etc., but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0042] As described above, more and more vehicles are beginning to be equipped with air suspension damping systems. An electromagnetic valve is provided in the air suspension damping system. The electromagnetic valve is installed between adjacent chambers inside the air suspension damping system and is used to control the connection and disconnection of the air paths of the adjacent chambers. Existing electromagnetic valves have some deficiencies. For example, when the electromagnetic valve is energized and working, it is subject to relatively large movement resistances such as frictional force and pressure, which results in problems such as slow closing response or even inability to close of the electromagnetic valve, thus affecting the performance of the electromagnetic valve.

[0043] To at least solve the above problems, an embodiment of the present disclosure provides an electromagnetic valve 1 for an air suspension damping system of a vehicle. The following refers to Figures 1 to 14 to describe the specific structure of the electromagnetic valve 1 according to the embodiment of the present disclosure.

[0044] Figure 1 and Figure 2 respectively show cross-sectional views of an electromagnetic valve 1 in an open state and a closed state according to an exemplary embodiment of the present disclosure. The electromagnetic valve 1 of the embodiment of the present disclosure is a normally open valve. Therefore, in Figure 1 the shown embodiment, the electromagnetic valve 1 is in a non-energized state. In Figure 2 the embodiment, the electromagnetic valve 1 is in an energized state. As shown in the figure, the electromagnetic valve 1 connects two chambers A and B, and the chambers A and B are filled with a gas medium. The electromagnetic valve 1 has a fixed part that remains stationary during the operation of the electromagnetic valve 1. The fixed part includes a valve seat 20 and a fixed iron core 60. An axial hole 21 connected to the chamber A and a lateral hole 22 connected to the chamber B are provided in the valve seat 20.

[0045] The following briefly describes the working process of the electromagnetic valve 1 in combination with Figure 1 and Figure 2 When the solenoid 30 of the electromagnetic valve 1 is not energized, the electromagnetic valve 1 is in Figure 1 the shown normally open state. At this time, the valve stem 70 of the electromagnetic valve 1 is disengaged from the valve seat 20. When the solenoid 30 of the electromagnetic valve 1 is energized, a magnetic field will be generated. The armature 40 moves under the action of the magnetic field. As a moving part, it overcomes the elastic force of the spring 50 and moves towards the fixed iron core 60. The armature 40 is in interference fit with the armature shaft 42, resulting in the armature shaft 42 and the armature 40 moving towards the fixed iron core 60 together. The armature shaft 42 is also in interference fit with the valve stem 70, so that the valve stem 70 moves towards the valve seat 20 synchronously with the armature shaft 42 and the armature 40. As the valve stem 70 finally abuts against the valve seat 20, as in Figure 2As shown, the leakage path between chamber A and chamber B will be closed. Finally, the valve stem 70 contacts the valve seat 20 to form a seal, and the solenoid valve 1 is in the closed state at this time. When the solenoid valve 1 is closed, the air pressure in chamber A connected to the shaft hole 21 acts on the lower end face of the valve stem 70, and the air pressure is in the opening direction of the solenoid valve 1. If this air pressure exceeds the electromagnetic force, the air pressure will push open the sealing effect of the valve stem, causing the solenoid valve 1 to leak and fail. As Figure 1 shown, an axial through hole 72 for achieving pressure balance is arranged on the valve stem 70, so that the gas at the lower end can enter the upper part of the valve stem 70 through the axial through hole 72. If the areas of the lower end face and the upper end face of the valve stem 70 are the same, the air pressure can be balanced; and the gas passing through the valve stem 70 is not allowed to leak into the side chamber of the valve seat 20, otherwise it will cause gas leakage and affect the performance of the solenoid valve 1. As Figure 1 shown, the seal 10 of the embodiment of the present disclosure is exactly arranged in the medium leakage channel between the valve stem 70 and the valve seat 20, playing a role in preventing the fluid medium from passing through the medium leakage channel.

[0046] Figure 3 and Figure 4 respectively show Figure 1 and Figure 2 partial enlarged views of part C in Figure 3 and Figure 4 shown, the seal 10 is basically arranged on the axial outside of the valve stem 70, and the fixed iron core 60 is basically arranged on the axial outside of the seal 10. In Figure 3 and Figure 4 shown in the embodiment, the seal 10 is fixed on the fixed iron core 60, so the seal 10 is stationary. On the contrary, the valve stem 70 can move along the central axis L, which makes the sealing situation between the valve stem 70 and the seal 10 change with the movement of the valve stem 70.

[0047] As Figure 3 and Figure 4 shown, and with reference to Figures 1 to 2 , the valve stem 70 includes an outer periphery 74, and the valve stem 70 further includes a valve stem recess 75 extending from the outer periphery 74 inwardly, that is, from the outer periphery 74 of the valve stem 70 towards the central axis L of the solenoid valve 1. Figure 5 shows Figure 3 and Figure 4 a perspective view of a schematic embodiment of the valve stem 70 in Figure 5 shown. In the embodiment shown in

[0048] As Figure 3As shown, when the solenoid valve 1 is not powered on, the solenoid valve 1 is in an open state, and the valve stem 70 is separated from the valve seat 20. At this time, there is an overlapping portion between the sealing lip 11 of the sealing body 10 and the recessed portion 75 in the axial direction. Since the recessed portion 75 is concave inward, there is a gap G between the recessed portion 75 and the sealing body 10, so that the fluid medium can enter the gap G. Therefore, when the solenoid valve 1 does not start to be powered on, the space SI inside the sealing body 10 can be connected with the space SE outside the sealing body 10, so that there is no pressure difference between the two, which helps to unload the fluid pressure of the space SI inside the sealing body 10. Compared with the situation where there is a pressure difference between the inner and outer spaces of the sealing body 10, in the scheme of the embodiment of the present disclosure, when the solenoid valve 1 starts to be powered on, the space SI inside the sealing body 10 no longer has resistance to resist the movement of the valve stem 70, which makes the movement of the valve stem 70 easier. As a result, the response speed of the solenoid valve 1 can be improved. Furthermore, since the electromagnetic valve 1 can be driven with a smaller current, energy saving can be achieved, the wear of the sealing body 10 can be reduced, and the service life of the product can be increased.

[0049] like Figure 4 As shown in FIG. 1 , when the solenoid valve 1 is energized, the valve stem 70 moves to abut against the valve seat 20 under the action of the electromagnetic force, and the solenoid valve 1 is in a closed state. Figure 3 In the state shown, since the valve stem 70 has moved a certain distance in the axial direction, the recessed portion 75 and the stationary sealing body 10 are offset in the axial direction, resulting in a portion of the sealing body 10, such as the sealing lip 11, being at the same height as the main body of the valve stem 70 (such as the portion indicated by the periphery 74). Since the main body of the valve stem 70 does not have an inwardly concave recessed portion 75, and the sealing body 10 is made of a material with a certain elasticity, such as rubber, the sealing lip 11 of the sealing body 10 will abut against the main body of the valve stem 70 due to its elasticity, resulting in Figure 3 The gap G shown is Figure 4 Therefore, when the solenoid valve 1 is powered on and works normally, its sealing effect is not affected.

[0050] According to the embodiment of the present disclosure, when the solenoid valve 1 is powered on, the sealing body 10 can still achieve a good sealing effect, and a pressure difference is formed between the space SI inside the sealing body 10 and the space SE outside the sealing body 10. When the solenoid valve 1 is not powered on, the pressure difference is effectively eliminated because the fluid medium can enter the gap G between the recessed portion 75 and the sealing body 10, so that the solenoid valve 1 can start working with less friction resistance when it is powered on next time.

[0051] Figure 6 FIG. 1 shows a partial enlarged view of a solenoid valve 1 according to another embodiment of the present disclosure, Figure 7 Shows Figure 6A three-dimensional view of the valve stem 70 in FIG.

[0052] Different from the implementation described above, Figure 6 and Figure 7 As shown in FIG. 1 , the valve stem recess 76 is a groove 76 extending toward the central axis L of the solenoid valve 1 around a suitable portion of the outer circumference 74 of the valve stem 70. Similar to the aforementioned recess 75, when the solenoid valve 1 is not energized, as shown in FIG. Figure 6 As shown, there is an overlap between the sealing lip 11 of the sealing body 10 and the groove 76 in the axial direction. Since the groove 76 is concave inward, there is a gap G between the groove 76 and the sealing lip 11 of the sealing body 10, so that the fluid medium can enter the gap G. Therefore, when the solenoid valve 1 is not powered on, the inner and outer spaces of the sealing body 10 can be connected so that there is no pressure difference between the two, which helps to relieve the fluid pressure of the space SI in the sealing body 10. When the solenoid valve 1 is powered on, the valve stem 70 moves to abut against the valve seat 20 under the action of the electromagnetic force, and the solenoid valve 1 is in a closed state. Compared to Figure 6 In the state shown in the figure, since the valve stem 70 has moved a certain distance in the axial direction, the groove 76 and the stationary sealing body 10 are staggered in the axial direction, resulting in a part of the sealing body 10, such as the sealing lip 11, being at the same height as the main body of the valve stem 70. Since the main body of the valve stem 70 does not have the inwardly concave groove 76, the sealing lip 11 of the sealing body 10 will abut against the main body of the valve stem 70 due to its elasticity, resulting in Figure 6 The gap G shown in FIG. 1 is no longer present. Therefore, when the solenoid valve 1 is powered on and works normally, its sealing effect is not affected.

[0053] according to Figures 6 to 7 The embodiment provides another possibility for the valve stem recess so that it can be used in more scenarios. In some embodiments, the groove 76 can be made by removing material from a portion of the outer periphery 74 of the valve stem 70 along the radial direction of the valve stem 70. In this way, Figures 6 to 7 The valve stem recess in the form of groove 76 is easy to process, convenient to manufacture, and low in cost. Figures 6 to 7 The groove 76 shown in the figure is generally in the shape of a racetrack, but this is merely schematic. Grooves of other shapes, such as elliptical, circular, polygonal, etc., are all feasible.

[0054] Figure 8 FIG. 2 shows a partial enlarged view of a solenoid valve 1 according to another embodiment of the present disclosure. Figure 9 Shows Figure 8 A three-dimensional view of the valve stem 70 in FIG.

[0055] Different from the implementation described above, Figure 8 and Figure 9As shown in FIG. 1 , the valve stem recess 77 is a keyway 77 extending from a suitable position of the outer circumference 74 of the valve stem 70 toward the central axis L of the solenoid valve 1, and the inner side 770 of the keyway 77 is a plane. Similar to the aforementioned recess 75 and groove 76, when the solenoid valve 1 is not energized, as shown in FIG. Figure 8 As shown, there is an overlap between the sealing lip 11 of the sealing body 10 and the key slot 77 in the axial direction. Since the key slot 77 is concave inward, there is a gap G between the key slot 77 and the sealing lip 11 of the sealing body 10, so that the fluid medium can enter the gap G. Therefore, when the solenoid valve 1 is not powered on, the inner and outer spaces of the sealing body 10 can be connected so that there is no pressure difference between the two, which helps to relieve the fluid pressure of the space SI in the sealing body 10. When the solenoid valve 1 is powered on, the valve stem 70 moves to abut against the valve seat 20 under the action of the electromagnetic force, and the solenoid valve 1 is in a closed state. Compared to Figure 8 In the state shown, since the valve stem 70 has moved a certain distance in the axial direction, the key groove 77 and the stationary sealing body 10 are offset in the axial direction, resulting in a portion of the sealing body 10, such as the sealing lip 11, being at the same height as the main body of the valve stem 70 (such as the portion indicated by the periphery 74). Since the main body of the valve stem 70 does not have an inwardly concave key groove 77, the sealing lip 11 of the sealing body 10 will abut against the main body of the valve stem 70 due to its elasticity, resulting in Figure 8 The gap G shown in FIG. 1 is no longer present. Therefore, when the solenoid valve 1 is powered on and works normally, its sealing effect is not affected.

[0056] according to Figures 8 to 9 The embodiment provides another possibility for the valve stem recess so that it can be used in more scenarios. In some embodiments, the keyway 77 can be made by removing material from a portion of the outer periphery 74 of the valve stem 70 along the tangential direction of the valve stem 70 (for example, by a milling process). In this way, Figures 8 to 9 The valve stem recess in the form of a keyway 77 is also easy to process, convenient to manufacture, and low in cost. Figures 8 to 9 The inner side 770 of the keyway 77 shown in the figure is a plane, but this is merely schematic. In other embodiments, the inner side 770 may also be curved.

[0057] Figure 10 and Figure 11 Cross-sectional views of a solenoid valve 1 in an open state and a closed state according to an exemplary embodiment of the present disclosure are respectively shown.

[0058] Different from the previous embodiment, Figure 10 and Figure 11In the illustrated embodiment, the seal body 10 is mounted on the valve stem 70, so its axial position changes with the movement of the valve stem 70. In contrast, the clearance structure is provided on the stationary iron core 60. In other words, in this pair of structures of the seal body 10 and the clearance structure, the seal body 10 is movable while the clearance structure is stationary. For example, the clearance structure is a recess of the stationary iron core extending from at least a part of the inner circumference 64 of the stationary iron core 60 away from the central axis L of the solenoid valve 1. This will be described in detail below in conjunction with Figures 12 to 14 Detailed description.

[0059] Figure 12 FIG. shows a partially enlarged view of the solenoid valve 1 according to another embodiment of the present disclosure, Figure 13 Shows Figure 12 A perspective view of the stationary iron core 60 in. In Figures 12 to 13 In the illustrated embodiment, the recess of the stationary iron core may be a groove 66 extending away from the central axis L of the solenoid valve 1 at a suitable position around the inner circumference 64 of the stationary iron core 60. When the solenoid valve 1 is not energized, there is an overlapping portion in the axial direction between the sealing lip 11 of the seal body 10 fixed on the valve stem 70 and the groove 66 located on the stationary iron core 60. Since the groove 66 is recessed along the direction away from the central axis L, there is a gap G between the groove 66 and the sealing lip 11 of the seal body 10, allowing the fluid medium to enter this gap G. Thus, when the solenoid valve 1 has not started to be energized, the inner and outer spaces of the seal body 10 can be connected, and there is no pressure difference between the two, which helps to relieve the fluid pressure in the space SI inside the seal body 10. When the solenoid valve 1 is energized, as Figure 12 Shown, the valve stem 70 moves under the action of the electromagnetic force to abut against the valve seat 20, and at this time the solenoid valve 1 is in a closed state. Compared with the non-energized state, since the valve stem 70 has moved a certain distance in the axial direction at this time, therefore, as Figure 12 Shown, the groove 66 and the stationary seal body 10 are axially offset, resulting in a part of the seal body 10, such as the sealing lip 11, being at the same height as the main body of the stationary iron core 60 (for example, the part indicated by the inner circumference 64). Since there is no inwardly concave groove 66 in the main body of the stationary iron core 60, the sealing lip 11 of the seal body 10 will abut against the main body of the valve stem 70 due to its elasticity, causing the above-described gap G to no longer exist. Thus, when the solenoid valve 1 is normally energized, its sealing effect is not affected.

[0060] In some embodiments, the groove 66 can be formed by removing material from a part of the stationary iron core 60 in the radial direction of the stationary iron core 60. In this way, Figures 12 to 13 The recess of the stationary iron core in the form of the groove 66 in is easy to machine, convenient to manufacture, and low in cost. It should be noted that although Figures 6 to 7The groove 66 shown is generally in a racetrack shape, but this is only illustrative. Grooves of other shapes, such as oval, circular, polygonal, etc., are also feasible.

[0061] Figure 14 A partial enlarged view of the solenoid valve 1 according to another embodiment of the present disclosure is shown. In the illustrated embodiment, the stationary iron core recess is a recess 67 that extends away from the central axis L of the solenoid valve 1 around the entire inner circumference 64 of the stationary iron core 60. The function of the recess 67 is similar to that of the groove 66 described above and will not be elaborated here. According to Figure 14 the embodiment provides another possibility for the stationary iron core recess so that it can be used in more scenarios.

[0062] It should be noted that in the above description of Figures 10 to 14 the sealing lip 11 of the sealing body 10 interacts with the stationary iron core 60, that is, the sealing mating surface that cooperates with the sealing lip 11 is provided on the stationary iron core 60. However, in an embodiment not shown, the sealing mating surface can also be provided on the valve seat 20. In other words, in other embodiments, the sealing body 10 is provided on the valve stem 70, but it is the valve seat 20 that interacts with the sealing lip 11 of the sealing body 19, and such an embodiment also falls within the scope of the present disclosure.

[0063] The different implementation manners of the solenoid valve 1 are described above in conjunction with the respective drawings, but these are only illustrative and not restrictive. Without departing from the inventive concept of the present disclosure, those skilled in the art can also conceive of other implementation manners, and these implementation manners all fall within the protection scope of the embodiments of the present disclosure. Although the embodiments of the present invention are described above with the vehicle air suspension damping system as the scenario, it should be understood that the solenoid valve 1 of 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 manners of the solenoid valve without departing from the idea of the present disclosure. Such embodiments also fall within the scope of the present invention.

[0064] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solenoid valve (1), characterized in that: include: The fixed part includes: a valve seat (20); and Fixed core (60), A valve stem (70) capable of abutting against the valve seat (20) or being detached from the valve seat (20); A sealing body (10) is partially disposed on the axial outer side of the valve stem (70), and the fixed iron core (60) is partially disposed on the axial outer side of the sealing body (10); The relative position of the sealing body (10) and one of the fixing portion and the valve stem (70) is fixed, and a space-avoiding structure is provided on the other of the fixing portion and the valve stem (70). When the solenoid valve (1) is not energized, the valve stem (70) is separated from the valve seat (20), and a gap G exists between a portion of the sealing body (10) and the air avoidance structure, so that the fluid medium can enter the gap G; and When the solenoid valve (1) is energized, the valve stem (70) moves along the central axis L to abut against the valve seat (20) in response to the electromagnetic force of the solenoid valve (1), and the portion of the sealing body (10) abuts against the main body of the valve stem (70) to block the fluid medium from entering the gap G.

2. The solenoid valve (1) according to claim 1, characterized in that: The relative positions of the sealing body (10) and the fixed iron core (60) are fixed, and the air avoidance structure is a valve stem recess extending from at least a portion of the outer periphery (74) of the valve stem (70) toward the central axis L of the solenoid valve (1).

3. The solenoid valve (1) according to claim 2, characterized in that: The valve stem recess is a recessed portion (75) extending around the entire outer circumference (74) of the valve stem (70) toward the central axis L of the solenoid valve (1).

4. The solenoid valve (1) according to claim 2, characterized in that: The valve stem recess is a groove (76) extending around a portion of the outer circumference (74) of the valve stem (70) toward the central axis L of the solenoid valve (1).

5. The solenoid valve (1) according to claim 4, characterized in that: The groove (76) is formed by removing material from the portion of the outer circumference (74) of the valve stem (70) in a radial direction of the valve stem (70).

6. The solenoid valve (1) according to claim 2, characterized in that: The valve stem recess is a keyway (77) extending around a portion of the outer circumference (74) of the valve stem (70) toward the central axis L of the solenoid valve (1).

7. The solenoid valve (1) according to claim 6, characterized in that: The key groove (77) is formed by removing material from a portion of the outer circumference (74) of the valve stem (70) along a tangential direction of the valve stem (70).

8. The solenoid valve (1) according to claim 1, characterized in that: The relative positions of the sealing body (10) and the valve stem (70) are fixed, and the air avoidance structure is a fixed iron core recess extending from at least a portion of the inner periphery (64) of the fixed iron core (60) away from the central axis L of the solenoid valve (1).

9. The solenoid valve (1) according to claim 8, characterized in that: The fixed iron core recess is a groove (66) extending around a portion of the inner circumference (64) of the fixed iron core (60) away from the central axis L of the solenoid valve (1).

10. The solenoid valve (1) according to claim 9, characterized in that: The groove (66) is formed by removing material from the portion of the fixed iron core (60) along the radial direction of the fixed iron core (60).

11. The solenoid valve (1) according to claim 8, characterized in that The fixed iron core recess is a recessed portion (67) extending around the entire inner circumference (64) of the fixed iron core (60) away from the central axis L of the solenoid valve (1).

12. The solenoid valve (1) according to any one of claims 1 to 11, characterized in that: The valve stem (70) comprises an axial through hole (72) extending along the central axis L of the solenoid valve (1).

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