Electromagnetic valve

Abstract

The electromagnetic valve 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 into 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 present application relates to the technical field of control valves for automobile air suspension systems, and in particular to a solenoid valve. Background Art

[0002] The distribution valve, also known as the air distribution valve, is mainly used in vehicles with air suspension systems. It adjusts the air pressure and airflow of the air suspension system. When the height of the vehicle changes during operation, the air distribution valve can be used to inflate or deflate the air spring airbag to adjust 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 multiple solenoid valves integrated inside it. The solenoid valves are respectively connected to the compressor pipeline of the air suspension. The solenoid valves are inflated by compressed air and air tanks. The air holes on the solenoid valves inflate and deflate the air springs of the air suspension system. The solenoid valve is an important component of the distribution valve, and its performance directly affects the performance of the distribution valve. The structure of the solenoid valve of the related art includes a valve body, an electromagnetic drive part and a valve core arranged in the valve body shell. The electromagnetic drive 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 to the moving iron core of the electromagnetic drive part and can move synchronously with the moving iron core to close or open the valve port of the valve body.

[0003] The silent effect of the solenoid valve when it is in action directly affects the user experience. For this reason, the solenoid valve of the related technology is connected with a cushion block or a buffer block on the end face of the moving iron core close to the static iron core. The cushion block or the buffer block is made of soft material. When the valve core opens the valve port, it abuts against the end of the static iron core to reduce the impact force between the moving iron core and the static iron core and reduce noise. Such as the solenoid valve disclosed in the Chinese prior patent applications with announcement numbers CN215721142U and CN221504116U. The valve body shell of the solenoid valve of the above-mentioned related technology will inevitably produce a certain deformation after long-term use, which will cause the movement of the moving iron core to be blocked and the solenoid valve to be scrapped; in order to extend the service life of the solenoid valve and facilitate the assembly of the moving iron core, a large gap is reserved between the outer circumferential wall of the moving iron core and the inner wall of the valve body shell, so that even if the valve body shell has a certain deformation after long-term use, it will not affect the movement of the moving iron core.

[0004] The solenoid valve of the above-mentioned related technology 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 electromagnetic coil is energized to make the moving iron core move toward the static iron core to open the valve, the moving iron core will tilt at a certain angle along the axial direction. In this way, even if a protruding soft buffer pad is connected to the end of the moving iron core, it will inevitably cause the inclined edge of the moving iron core to collide hard with the static iron core, thereby generating a large noise and a poor user experience. Summary of the invention

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

[0006] The technical solution of the present application is to provide a solenoid valve having the following structure:

[0007] A valve housing, a valve seat, an electromagnetic coil, a valve core, a static iron core and a moving iron core connected in the valve housing, wherein an elastic member is connected between the moving iron core and the static iron core, and the elastic member is used to make the moving iron core always have a movement tendency away from the static iron core;

[0008] A buffer assembly includes a first buffer component and a second buffer component, wherein the first buffer component is connected to one end of the moving iron core close to the static iron core and extends axially outward from the end surface of the moving iron core; the second buffer component is connected to one end of the static iron core close to the moving iron core and extends axially outward from the end surface of the static iron core; the projection of the first buffer component along the axial direction of the valve housing and the projection of the second buffer component along the axial direction of the valve housing do not overlap with each other, and are used for making the first buffer component resist against the static iron core, and making the second buffer resist against the moving iron core, when the electromagnetic coil is energized to cause the moving iron core to move toward the static iron core.

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

[0010] In some embodiments, both the first buffer and the second buffer are made of flexible materials, and the height of the first buffer extending from the end surface of the moving iron core is higher than or equal to the height of the second buffer extending from the end surface of the stationary 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 shape of the notch is one or more of a rectangular parallelepiped, a trapezoid and an arc.

[0013] In some embodiments, an axially concave installation 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 member is connected in the installation 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 member is connected in the connecting groove.

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

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

[0016] In some embodiments, one end of the valve housing is sealed to the valve seat, and the other end of the valve housing is sealed to the static iron core.

[0017] In some embodiments, 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 near one end of the valve seat, and a valve port that is sealed against the valve core is provided at the inner end of the valve seat.

[0018] In summary, compared with the related art, the solenoid valve of the present application has the following advantages: the solenoid valve is provided with a buffer assembly between the moving iron core and the stationary iron core, and the buffer assembly includes a first buffer connected to the moving iron core and a second buffer connected to the stationary iron core, the first buffer and the second buffer both extend outwardly along the axial direction, and the projection of the first buffer along the axial direction of the valve housing and the projection of the second buffer along the axial direction of the valve housing do not overlap each other, so that when the solenoid valve is opened, the first buffer abuts against the stationary iron core, and the second buffer abuts against the moving iron core, that is, the first buffer and the second buffer are axially spaced apart. Staggered arrangement; even if the moving iron core tilts during axial movement, the staggered cooperation of the first buffer member and the second buffer member will prevent the inclined edge of the moving iron core from colliding hard with the static iron core. Therefore, the solenoid valve can effectively prevent the moving iron core from colliding hard with the static iron core due to its tilt. In addition, when the solenoid valve is opened, the first buffer member abuts against the static iron core, and the second buffer member abuts against the moving iron core, thereby increasing the buffering area between the moving iron core and the static iron core. Therefore, the impact force between the moving iron core and the static iron core can be effectively reduced or absorbed, so that the solenoid valve has a good silent effect when it is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a solenoid valve in some embodiments of the present application.

[0020] Figure 2 is a cross-sectional view of a solenoid valve in some embodiments of the present application.

[0021] Figure 3 It is a three-dimensional diagram of the cross-sectional structure of a solenoid valve in some embodiments of the present application.

[0022] Figure 4 It is a schematic projection diagram of a first buffer component and a second buffer component of a solenoid valve in some embodiments of the present application along the axial direction.

[0023] Figure 5It is a structural stereogram of a buffer assembly of a solenoid valve in some embodiments of the present application.

[0024] Description of reference numerals:

[0025] 1. Valve body, 100. Valve shell, 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 air hole, 201. Second air hole, 202. Valve port. DETAILED DESCRIPTION

[0026] First, those skilled in the art should understand that these implementations 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 make adjustments to them as needed to adapt to specific application scenarios.

[0027] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings 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 clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 to Figure 3As shown; the embodiment of the present application discloses a solenoid valve, which is used for an air pressure distribution valve of an automobile air suspension system. The structure of the solenoid valve includes a valve body 1 and a valve seat 2. The valve body 1 includes a valve housing 100, an electromagnetic coil 101, and a valve core 105, a static iron core 103 and a moving iron core 102 connected in the valve housing 100, and an elastic member 104 is connected between the moving iron core 102 and the static iron core 103, one end of the elastic member 104 is against the static iron core 103, and the other end of the elastic member 104 is against the moving iron core 102, so that the moving iron core 102 always has a movement tendency away from the static iron core 103; specifically, a first positioning hole is provided at the center of the inner end of the static iron core 103, a second positioning hole is provided at the center of one end of the moving iron core 102 close to the static iron core 103, the elastic member 104 is a coil spring, and the two ends of the elastic member 104 are respectively connected to the first positioning hole and the second positioning hole.

[0031] The valve housing 100 of this embodiment is a metal housing, one end of the valve housing 100 is sealed and connected to the valve seat 2, and the other end of the valve housing 100 is sealed and connected to the static iron core 103. The moving iron core 102 is located between the static iron core 103 and the valve seat 2 and is slidably fitted in the valve housing 100 along the axial direction of the valve housing 100, and the end of the moving iron core 102 away from the static iron core 103 is connected to the valve core 105; the valve seat 2 has a central hole, which is a first air hole 200, and the outer wall of the valve housing 100 near the end of the valve seat 2 is provided with a second air hole 201, and the inner end of the valve seat 2 is provided with a valve port 202 that is sealed against the valve core 105. The valve core 105 closes the valve port 202, thereby disconnecting the first air hole 200 and the second air hole 201, and the valve is closed; similarly, the valve core 105 opens the valve port 202, thereby connecting the first air hole 200 and the second air hole 201, and the valve is opened.

[0032] In the above embodiment, an annular groove 110 is provided on the outer circumferential wall of the moving iron core 102. The provision of the annular groove 110 reduces the contact area between the moving iron core 102 and the inner wall of the valve housing 100, thereby making the movement of the moving iron core 102 smoother.

[0033] It is not difficult to understand that when the electromagnetic coil 101 is de-energized, due to the elastic force of the elastic member 104, the moving iron core 102 moves in the direction away from the static iron core 103 to close the valve port 202, and under the elastic force of the elastic member 104, the valve is in a closed state; when the electromagnetic coil 101 is energized, the electromagnetic coil 101 generates an electromagnetic force, thereby magnetizing the static iron core 103 and the moving iron core 102, so that the two overcome the elastic force of the elastic member 104 under the action of mutual magnetic attraction, so that the moving iron core 102 moves in the direction close to the static iron core 103, and the valve is in an 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 first protruding buffer part, it will inevitably cause the inclined edge of the moving iron core to 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 surface 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 surface 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 in 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, in addition to the first buffer 106 being provided at the end of the moving iron core 102, the second buffer 107 is also provided at the end of the stationary iron core 103. Therefore, when the electromagnetic coil 101 is energized to make the moving iron core 102 approach the stationary iron core 103, even if the moving iron core 102 is tilted during axial movement, the inclined edge of the moving iron core 102 will not have a hard collision with the stationary iron core 103 due to the staggered cooperation of the first buffer 106 and the second buffer 107. Therefore, the solenoid valve can be effectively Prevent the moving iron core 102 from having a hard collision with the static iron core 103 due to its tilt; in addition, when the solenoid valve is opened, the first buffer member 106 is against the static iron core 103, and the second buffer member 107 is against the moving iron core 102. Under the joint action of the first buffer member 106 and the second buffer member 107, the buffer area between the moving iron core 102 and the static iron core 103 is increased, thereby effectively reducing or absorbing the impact force between the moving iron core 102 and the static iron core 103, so that the solenoid valve has a good silent effect when opening, which gives the user a good experience.

[0037] Further, in the present embodiment, the first buffer 106 and the second buffer 107 are both arranged in an annular shape, preferably in a circular shape, and the outer diameter of the first buffer 106 is smaller than the inner diameter of the second buffer 107. After the solenoid 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 the first buffer 106 is sleeved inside the second buffer 107, so that even if the moving iron core 102 is axially tilted, the inclined portion of the end face of the moving iron core 102 just abuts against the second buffer 107 to avoid hard contact with the end face of the static iron core.

[0038] In other embodiments, the first buffer component and the second buffer component may also be configured to have other shapes, such as a square, an oval, etc.

[0039] In this embodiment, the first buffer 106 and the second buffer 107 are both made of flexible materials, such as rubber, plastic and other flexible materials of the prior art, which have good flexibility and shock-absorbing performance, and can absorb the impact force of the moving iron core when they collide with the static iron core 103 and the moving iron core 102.

[0040] Further in this embodiment, see Figure 2 and Figure 5As shown, the height of the first buffer member 106 extending from the end surface of the moving iron core 102 is higher than or equal to the height of the second buffer member 107 extending from the end surface of the stationary 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 solenoid valve is opened, the first buffer 106 and the static iron core 103, as well as the second buffer 107 and the moving iron core 102 are simultaneously abutted against each other; 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 solenoid valve is opened, the first buffer 106 and the static iron core 103 are first abutted against each other, and after the first buffer 106 is compressed by force, the second buffer 107 and the moving iron core 102 are abutted against each other, so that there is a two-level buffer between the moving iron core 102 and the static iron core 103, thereby further reducing or absorbing the impact force between the moving iron core 102 and the static iron core 103, so that the solenoid valve has a good silencing effect when it is opened.

[0041] In the above-mentioned embodiment, a notch is provided on one end of the first buffer 106 close to the static iron core 103, and / or a notch is provided on one end of the second buffer 107 close to the moving iron core 102. Figure 3 and Figure 5 As shown, the free ends of the first cushion buffer 106 and the second buffer 107 are respectively provided with a rectangular notch 108. The provision of the notch 108 on the first buffer 106 and the second buffer 107 can prevent the vacuum adsorption from being generated when the first buffer 106 and the static iron core 103 and the second buffer 107 and the dynamic iron core 102 collide quickly, making it difficult for the dynamic iron core 102 to separate from the static iron core 103. In addition, the provision of the notch 108 can also improve the deformation capacity of the first buffer 106 and the second buffer 107, thereby further weakening or absorbing the force during the collision, so as to achieve a good silencing effect.

[0042] In other embodiments, the notches on the first cushion member and the second cushion member may also be set to be trapezoidal or arc-shaped.

[0043] Also in this embodiment, see Figure 2 and Figure 3 As shown, the end surface of the static iron core 103 close to the moving iron core 102 is provided with an axially concave mounting groove 109, and the second buffer 107 is connected in the mounting groove 109, and the end surface of the moving iron core 102 close to the static iron core 103 is provided with an axially concave connecting groove, and the first buffer 106 is connected in the connecting groove. This 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 impacted, 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 in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0045] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on 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 moving iron core connected in the valve housing, wherein an elastic member is connected between the moving iron core and the static iron core, and the elastic member is used to make the moving iron core always have a movement tendency away from the static iron core; A buffer assembly includes a first buffer component and a second buffer component, wherein the first buffer component is connected to one end of the moving iron core close to the static iron core and extends axially outward from the end surface of the moving iron core; the second buffer component is connected to one end of the static iron core close to the moving iron core and extends axially outward from the end surface of the static iron core; the projection of the first buffer component along the axial direction of the valve housing and the projection of the second buffer component along the axial direction of the valve housing do not overlap with each other, and are used for making the first buffer component resist against the static iron core, and making the second buffer resist against the moving iron core, 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, characterized in that: The first buffer and the second buffer are both made of flexible materials, and the height of the first buffer extending from the end surface of the moving 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, characterized in that: 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 rectangular parallelepiped, 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 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 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: A tapered surface is provided on the outer edge of the end surface of one end of the moving iron core close to the static iron core.

8. The solenoid valve according to claim 1, characterized in that: An annular groove is arranged 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: The center of the valve seat is provided with a first air hole, and the outer wall of the valve shell close to one end of the valve seat is provided with a second air hole, and the inner end of the valve seat is provided with a valve port which is sealed against the valve core.

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