Electromagnetic valve

Abstract

The utility model discloses an electromagnetic valve which comprises a valve shell, a valve seat, an electromagnetic coil, a valve element, a static iron core and a movable iron core, the valve element, the static iron core and the movable iron core are connected in the valve shell, and an elastic piece is connected between the movable iron core and the static iron core. The buffering assembly comprises a first buffering piece and a second buffering piece, and the first buffering piece is connected to the end, close to the static iron core, of the movable iron core and outwards extends out of the end face of the movable iron core in the axial direction. The second buffer piece is connected to one end, close to the movable iron core, of the static iron core and extends out of the end face of the static iron core in the axial direction; the projection of the first buffering piece in the axial direction of the valve shell and the projection of the second buffering piece in the axial direction of the valve shell do not coincide, and when the electromagnetic coil is electrified to enable the movable iron core to move in the direction close to the static iron core, the first buffering piece abuts against the static iron core, and the second buffering piece abuts against the movable iron core. According to the electromagnetic valve, hard impact between the movable iron core and the static iron core due to inclination can be effectively prevented, the impact strength between the movable iron core and the static iron core can be effectively reduced, and the mute effect is good.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile air suspension system control valves, in particular to an electromagnetic valve. BACKGROUND

[0002] The distribution valve, namely the air distribution valve, is mainly applied to a vehicle with an air suspension system, and adjusts the air pressure and airflow of the air suspension system. When the height of the vehicle body changes during the running of the vehicle, the air distribution valve can inflate or deflate the air spring air bag, so as to realize the adjustment of the suspension height and hardness of the vehicle, thereby improving the suspension performance and driving stability of the vehicle. The distribution valve of the related art has a plurality of electromagnetic valves integrated therein, the electromagnetic valves are respectively connected to the compressor pipeline of the air suspension, the electromagnetic valves are inflated by compressed air and the air tank, and the air holes on the electromagnetic valves inflate or deflate the air spring of the air suspension system. The electromagnetic valve is an important component of the distribution valve, and its performance directly affects the performance of the distribution valve. The electromagnetic valve of the related art has a valve body and an electromagnetic driving part and a valve core arranged in the valve body shell. The electromagnetic driving part includes an electromagnetic coil, a moving iron core, a static iron core, and a spring arranged between the moving iron core and the static iron core. The valve core is connected with the moving iron core of the electromagnetic driving part and can move synchronously with the moving iron core to close or open the valve port of the valve body.

[0003] The mute effect of the electromagnetic valve when it is in action directly affects the user experience. Therefore, the electromagnetic valve of the related art is connected with a pad or a buffer block on the end face of the end of the moving iron core close to the static iron core. The pad or the buffer block is made of soft material and can reduce the impact force between the moving iron core and the static iron core and reduce the noise when the valve core opens the valve port. The electromagnetic valve disclosed in the prior Chinese patent applications with the announcement numbers CN215721142U and CN221504116U. The valve body shell of the electromagnetic valve of the related art will inevitably deform after a long time of use, thereby causing the movement of the moving iron core to be blocked and the electromagnetic valve to be scrapped. In order to prolong the service life of the electromagnetic valve and facilitate the assembly of the moving iron core, a larger gap is reserved between the outer circumferential wall of the moving iron core and the inner wall of the valve body shell. Even if the valve body shell deforms to a certain extent after a long time of use, the movement of the moving iron core will not be affected.

[0004] The electromagnetic valve of the related art has the following defects in actual use: due to the existence of the gap between the outer circumferential wall of the moving iron core and the inner wall of the valve body shell, when the electromagnetic force generated by the energization of the electromagnetic coil moves the moving iron core in the direction close to the static iron core to open the valve, the moving iron core will tilt by a certain angle along the axial direction. Even if the soft buffer pad block protruding outward is connected to the end of the moving iron core, the tilted edge of the moving iron core will inevitably collide with the static iron core, thereby generating a large amount of noise and reducing the user experience. CONTENT OF THE UTILITY MODEL

[0005] The technical problem to be solved by the present application is to overcome the defects of the above related technologies, and to provide an electromagnetic valve which can effectively prevent the hard impact of the moving iron core on the static iron core due to tilting, effectively reduce the impact force between the moving iron core and the static iron core, and has a good silent effect.

[0006] The technical solution of the present application is to provide an electromagnetic valve with the following structure:

[0007] The valve shell, the valve seat, the electromagnetic coil, the valve core, the static iron core and the moving iron core connected in the valve shell, and the elastic member connected between the moving iron core and the static iron core, which is used to make the moving iron core always have a movement trend away from the static iron core;

[0008] The buffer assembly includes a first buffer member and a second buffer member, the first buffer member is connected to one end of the moving iron core close to the static iron core and extends outward from the end surface of the moving iron core in the axial direction; the second buffer member is connected to one end of the static iron core close to the moving iron core and extends outward from the end surface of the static iron core in the axial direction; the projection of the first buffer member in the axial direction of the valve shell does not coincide with the projection of the second buffer member in the axial direction of the valve shell, which is used to make the first buffer member abut against the static iron core and the second buffer member abut against the moving iron core when the moving iron core moves towards the static iron core under the action of the electromagnetic coil.

[0009] In some embodiments, the first buffer member and the second buffer member are both arranged in a ring shape, and the outer diameter of the first buffer member is smaller than the inner diameter of the second buffer member.

[0010] In some embodiments, the first buffer member and the second buffer member are both made of flexible material, and the height of the first buffer member extending out of the end surface of the moving iron core is higher than or equal to the height of the second buffer member extending out of the end surface of the static iron core.

[0011] In some embodiments, a notch is provided on one end of the first buffer member close to the static iron core, and / or a notch is provided on one end of the second buffer member close to the moving iron core.

[0012] In some embodiments, the notch has one or more of the shapes of a cuboid, a trapezoid and an arc.

[0013] In some embodiments, an axially recessed mounting groove is provided on the end surface of one end of the static iron core close to the moving iron core, and the second buffer member is connected in the mounting groove; an axially recessed connecting groove is provided on the end surface of one end of the moving iron core close to the static iron core, and the first buffer member is connected in the connecting groove.

[0014] In some embodiments, the moving iron core is provided with a tapered surface at the outer edge of the end surface of one end of the static iron core.

[0015] In some embodiments, the moving iron core is provided with an annular groove on the outer circumferential wall.

[0016] In some embodiments, one end of the valve shell is sealingly connected with the valve seat, and the other end of the valve shell is sealingly connected with the static iron core.

[0017] In some embodiments, the center of the valve seat is provided with a first air hole, and the outer side wall of one end of the valve shell close to the valve seat is provided with a second air hole, and the inner end of the valve seat is provided with a valve port that sealingly abuts against the valve core.

[0018] In summary, the electromagnetic valve of the present application has the following advantages compared with related art: the electromagnetic valve is provided with a buffer assembly between the moving iron core and the static iron core, the buffer assembly includes a first buffer connected to the moving iron core and a second buffer connected to the static iron core, the first buffer and the second buffer both extend outward along the axial direction, and the projection of the first buffer along the axial direction of the valve shell does not overlap with the projection of the second buffer along the axial direction of the valve shell, so that when the electromagnetic valve is opened, the first buffer abuts against the static iron core, and the second buffer abuts against the moving iron core, i.e., the first buffer and the second buffer are staggered along the axial direction. Even if the moving iron core tilts when moving axially, the tilted edge of the moving iron core will not collide with the static iron core due to the staggered cooperation of the first buffer and the second buffer, so that the electromagnetic valve can effectively prevent the moving iron core from colliding with the static iron core due to tilting. In addition, when the electromagnetic valve is opened, the first buffer abuts against the static iron core, and the second buffer abuts against the moving iron core, which increases the buffer area between the moving iron core and the static iron core, thereby effectively reducing or absorbing the impact force between the moving iron core and the static iron core, and making the electromagnetic valve have good silent effect during opening operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of an electromagnetic valve of some embodiments of the present application.

[0020] Figure 2 is a sectional view of an electromagnetic valve of some embodiments of the present application.

[0021] Figure 3 is a sectional structural perspective view of an electromagnetic valve of some embodiments of the present application.

[0022] Figure 4 is a projection schematic view of a first buffer and a second buffer of an electromagnetic valve of some embodiments of the present application along the axial direction.

[0023] Figure 5is a structural perspective view of a buffer assembly of an electromagnetic valve according to some embodiments of the present application.

[0024] Explanation of reference numerals:

[0025] 1. valve body, 100, valve housing, 101, electromagnetic coil, 102, moving iron core, 103, static iron core, 104, elastic member, 105, valve core, 106, first buffer member, 107, second buffer member, 108, notch, 109, mounting groove, 110, annular groove, 2, valve seat, 200, first gas hole, 201, second gas hole, 202, valve port. DETAILED DESCRIPTION

[0026] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0027] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0028] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0030] As Figures 1-3The application discloses an electromagnetic valve which is used for an air pressure distribution valve of an automobile air suspension system. The electromagnetic valve comprises a valve body 1 and a valve seat 2. The valve body 1 comprises a valve shell 100, an electromagnetic coil 101, a valve core 105, a static iron core 103 and a dynamic iron core 102 which are connected in the valve shell 100. An elastic element 104 is connected between the dynamic iron core 102 and the static iron core 103. One end of the elastic element 104 is abutted against the static iron core 103, and the other end of the elastic element 104 is abutted against the dynamic iron core 102, so that the dynamic iron core 102 always has a movement tendency of moving away from the static iron core 103. Specifically, a first positioning hole is arranged at the center of the inner end of the static iron core 103, a second positioning hole is arranged at the center of one end of the dynamic iron core 102 which is close to the static iron core 103, and the elastic element 104 is a spiral spring, and the two ends of the elastic element 104 are connected in the first positioning hole and the second positioning hole respectively.

[0031] The valve shell 100 is a metal shell. One end of the valve shell 100 is sealingly connected with the valve seat 2, and the other end of the valve shell 100 is sealingly connected with the static iron core 103. The dynamic iron core 102 is slidingly fitted in the valve shell 100 along the axial direction of the valve shell 100 and is located between the static iron core 103 and the valve seat 2. One end of the dynamic iron core 102 which is away from the static iron core 103 is connected with the valve core 105. The valve seat 2 has a central hole which is a first air hole 200. A second air hole 201 is arranged on the outer side wall of one end of the valve shell 100 which is close to the valve seat 2. The inner end of the valve seat 2 is provided with a valve port 202 which is abutted against and sealed by the valve core 105. The valve core 105 closes the valve port 202, so that the first air hole 200 and the second air hole 201 are disconnected, and the valve is closed. Similarly, the valve core 105 opens the valve port 202, so that the first air hole 200 and the second air hole 201 are connected, and the valve is opened.

[0032] In the above embodiment, an annular groove 110 is arranged on the outer circumferential wall of the dynamic iron core 102. The annular groove 110 reduces the contact area between the dynamic iron core 102 and the inner wall of the valve shell 100, so that the movement of the dynamic iron core 102 is more smooth.

[0033] It can be understood that, in the power-off state of the electromagnetic coil 101, the dynamic iron core 102 moves away from the static iron core 103 under the elastic force of the elastic element 104 to close the valve port 202, and the valve is in the closed state under the elastic force of the elastic element 104. In the power-on state of the electromagnetic coil 101, the electromagnetic coil 101 generates an electromagnetic force, so that the static iron core 103 and the dynamic iron core 102 are magnetized, and the dynamic iron core 102 moves towards the static iron core 103 under the magnetic attraction force and the elastic force of the elastic element 104, so that the valve is in the open state.

[0034] It can be understood that the moving iron core slides in the valve housing to open or close the valve core. The valve housing is made of metal. After the solenoid valve is used for a long time, the valve housing will inevitably be deformed. In order not to affect the movement of the moving iron core and extend the service life of the solenoid valve, the gap between the outer circumferential wall of the moving iron core and the inner wall of the valve housing is generally set larger. When the electromagnetic coil is energized to move the moving iron core toward the static iron core, the moving iron core will inevitably tilt at a certain angle along the axial direction, and the inclined edge of the end face of the moving iron core will collide hard with the end face of the static iron core to generate noise; even if the moving iron core is provided with a protruding first buffer part, it is inevitable that the inclined edge of the moving iron core will collide hard with the static iron core during the opening of the solenoid valve.

[0035] In this embodiment, in order to avoid the above-mentioned hard collision between the inclined edge of the moving iron core end face and the end face of the static iron core, see Figure 2 、 Figure 3 and Figure 4 As shown, a buffer assembly is arranged between the moving iron core 102 and the static iron core 103, and the buffer assembly includes a first buffer member 106 and a second buffer member 107. The first buffer member 106 is connected to one end of the moving iron core 102 close to the static iron core 103, and extends axially outward from the end face of the moving iron core 102; the second buffer member 107 is connected to one end of the static iron core 103 close to the moving iron core 102, and extends axially outward from the end face of the static iron core 103; the projection of the first buffer member 106 along the axial direction of the valve housing 100 and the projection of the second buffer member 107 along the axial direction of the valve housing 100 do not overlap with each other, that is, the first buffer member 106 and the second buffer member 107 are staggered along the axial direction, so that when the electromagnetic coil 101 is energized to cause the moving iron core 102 to move toward the static iron core 103, the first buffer member 106 is abutted against the static iron core 103, and the second buffer member 107 is abutted against the moving iron core 102.

[0036] That is, in the above embodiment, the electromagnetic valve is provided with the second buffer 107 at the end of the static iron core 103 in addition to the first buffer 106 at the end of the moving iron core 102, so that when the moving iron core 102 is close to the static iron core 103 due to the energization of the electromagnetic coil 101, even if the moving iron core 102 is tilted when moving in the axial direction, the tilted edge of the moving iron core 102 will not collide with the static iron core 103 hard due to the staggered cooperation of the first buffer 106 and the second buffer 107, so that the electromagnetic valve can effectively prevent the moving iron core 102 from being hard impacted by the static iron core 103 due to tilting; in addition, when the electromagnetic valve is opened, the first buffer 106 abuts against the static iron core 103, and the second buffer 107 abuts against the moving iron core 102, and the buffering area between the moving iron core 102 and the static iron core 103 is increased due to the cooperation of the first buffer 106 and the second buffer 107, so that the impact force between the moving iron core 102 and the static iron core 103 can be effectively reduced or absorbed, the electromagnetic valve has good mute effect during opening operation, and the user experience is good.

[0037] Further in the embodiment, the first buffer 106 and the second buffer 107 are both annular, preferably circular, and the outer diameter of the first buffer 106 is smaller than the inner diameter of the second buffer 107. After the electromagnetic valve is opened, the first buffer 106 abuts against the static iron core 103, the second buffer 107 abuts against the moving iron core 102, and the first buffer 106 is located inside the second buffer 107 or is sleeved in the second buffer 107, so that even if the moving iron core 102 is tilted in the axial direction, the tilted part of the end surface of the moving iron core 102 abuts against the second buffer 107 to avoid hard contact with the end surface of the static iron core.

[0038] In other embodiments, the first buffer and the second buffer can also be provided in other shapes, such as square, oval, etc.

[0039] In the embodiment, the first buffer 106 and the second buffer 107 are both made of flexible materials, such as rubber, plastic, etc., which have good flexibility and shock absorption performance, and can absorb the impact force of the moving iron core when abutting against the static iron core 103 and the moving iron core 102.

[0040] Further in the embodiment, referring to Figure 2 and Figure 5As shown, the height of the first buffer 106 extending out of the end face of the moving iron core 102 is higher than or equal to the height of the second buffer 107 extending out of the end face of the static iron core 103. That is, when the height of the first buffer 106 extending out of the end face of the moving iron core 102 is equal to the height of the second buffer 107 extending out of the end face of the static iron core 103, after the electromagnetic valve is opened, the first buffer 106 and the static iron core 103 and the second buffer 107 and the moving iron core 102 are simultaneously abutted; if the height of the first buffer 106 extending out of the end face of the moving iron core 102 is higher than the height of the second buffer 107 extending out of the end face of the static iron core 103, after the electromagnetic valve is opened, the first buffer 106 and the static iron core 103 are abutted first, and after the first buffer 106 is compressed by force, the second buffer 107 and the moving iron core 102 are abutted, so that the moving iron core 102 and the static iron core 103 have two-stage buffering, thereby further reducing or absorbing the impact force between the moving iron core 102 and the static iron core 103, and making the electromagnetic valve have good silence effect during opening operation.

[0041] In the foregoing embodiment, the first buffer 106 is provided with a notch on the end close to the static iron core 103, and / or the second buffer 107 is provided with a notch on the end close to the moving iron core 102. Specifically, in the embodiment, as shown in Figure 3 and Figure 5 the free ends of the first buffer 106 and the second buffer 107 are respectively provided with a notch 108 in the shape of a cuboid. The notch 108 provided on the first buffer 106 and the second buffer 107 can avoid vacuum adsorption when the first buffer 106 and the static iron core 103 and the second buffer 107 and the moving iron core 102 are rapidly abutted, so that the moving iron core 102 is difficult to separate from the static iron core 103. In addition, the notch 108 can also improve the deformation ability of the first buffer 106 and the second buffer 107, thereby further weakening or absorbing the impact force when abutting, so that the silence effect is good.

[0042] In other embodiments, the notch on the first buffer and the second buffer can also be provided in the shape of a trapezoid or an arc, etc.

[0043] In addition, in the embodiment, as shown in Figure 2 and Figure 3 the end face of the end close to the moving iron core 102 of the static iron core 103 is provided with a mounting groove 109 recessed in the axial direction, the second buffer 107 is connected in the mounting groove 109, and the end face of the end close to the static iron core 103 of the moving iron core 102 is provided with a connecting groove recessed in the axial direction, and the first buffer 106 is connected in the connecting groove. Such arrangement makes the installation of the first buffer 106 and the second buffer 107 more convenient and can prevent the first buffer 106 and the second buffer 107 from being separated when being abutted, so that the connection stability of the first buffer 106 and the second buffer 107 is good.

[0044] In the description of the embodiments of the present application, it should be noted that the terms "inner", "outer", and the like indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0045] In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "in this embodiment", "specific example", or "some examples" and the like means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the skilled person in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0046] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A solenoid valve, characterized in that: include A valve housing, a valve seat, an electromagnetic coil, a valve core, a static iron core, and a movable iron core connected to the valve housing, wherein an elastic member is connected between the movable iron core and the static iron core, and the elastic member is used to make the movable iron core always have a tendency to move away from the static iron core; A buffer assembly includes a first buffer member and a second buffer member, wherein the first buffer member is connected to one end of the moving iron core close to the static iron core, and extends axially outward from the end face of the moving iron core; the second buffer member is connected to one end of the static iron core close to the moving iron core, and extends axially outward from the end face of the static iron core; the projection of the first buffer member along the axial direction of the valve housing and the projection of the second buffer member along the axial direction of the valve housing do not overlap with each other, and are used to make the first buffer member and the static iron core abut against each other, and the second buffer member and the moving iron core abut against each other when the electromagnetic coil is energized to cause the moving iron core to move toward the static iron core.

2. The solenoid valve according to claim 1, characterized in that: The first buffer component and the second buffer component are both arranged in an annular shape, and the outer diameter of the first buffer component is smaller than the inner diameter of the second buffer component.

3. The solenoid valve according to claim 1, wherein: The first buffer and the second buffer are both made of flexible material, and the height of the first buffer extending from the end surface of the movable iron core is higher than or equal to the height of the second buffer extending from the end surface of the stationary iron core.

4. The solenoid valve according to claim 1, wherein: A notch is provided on one end of the first buffer member close to the static iron core, and / or a notch is provided on one end of the second buffer member close to the moving iron core.

5. The solenoid valve according to claim 4, characterized in that: The shape of the notch is one or more of a cuboid, a trapezoid and an arc.

6. The solenoid valve according to claim 1, characterized in that: An axially concave mounting groove is provided on the end surface of the static iron core close to one end of the moving iron core, and the second buffer is connected in the mounting groove; an axially concave connecting groove is provided on the end surface of the moving iron core close to one end of the static iron core, and the first buffer is connected in the connecting groove.

7. The solenoid valve according to claim 1, characterized in that: The outer edge of the end surface of the movable iron core close to the static iron core is provided with a tapered surface.

8. The solenoid valve according to claim 1, characterized in that: An annular groove is provided on the outer circumferential wall of the moving iron core.

9. The solenoid valve according to claim 1, characterized in that: One end of the valve housing is sealed and connected to the valve seat, and the other end of the valve housing is sealed and connected to the static iron core.

10. The solenoid valve according to claim 9, characterized in that: A first air hole is provided at the center of the valve seat, and a second air hole is provided on the outer wall of the valve housing close to one end of the valve seat. A valve port is provided at the inner end of the valve seat to seal against the valve core.

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