Solenoid valve

Abstract

The utility model relates to the technical field of vehicle parts, in particular to design of an electromagnetic valve. The utility model provides an electromagnetic valve which comprises a movable iron core, a static iron core, a spring, a coil assembly and a first shell, the movable iron core and the static iron core are oppositely arranged, the spring elastically supports the movable iron core, the coil assembly is arranged outside the static iron core, the first shell is plastic-coated outside the coil assembly, and the coil assembly comprises a coil framework and a gasket which are sleeved on the static iron core; wherein the gasket and the end face of the coil framework are embedded in the axial direction; the end face of the coil framework and / or the gasket limit the movable iron core and the spring in the axial direction, and the end face of the coil framework and / or the gasket limit the spring in the radial direction. By improving the coil framework and the gasket of the electromagnetic valve, the problem that the sealing ring is aged due to injection molding is solved, position deviation of the spring is avoided, and a winding window is effectively enlarged under the condition that the overall dimension and the interface dimension of the electromagnetic valve are not changed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parts, in particular to a solenoid valve. Background Art

[0002] Vehicle fluid control, such as brake control, transmission control, engine control, suspension control, etc., widely uses solenoid valves as actuators.

[0003] The main components of the solenoid valve include the valve core assembly and the coil assembly. Figure 1 The local structure of the existing solenoid valve is shown. Figure 1 As shown, the valve core assembly includes a relatively arranged moving iron core 110' and a stationary iron core 120', a spring 130' elastically supporting the moving iron core 110', a yoke 140' arranged outside the moving iron core 110' and the stationary iron core 120', and other components; the coil assembly is arranged outside the stationary iron core 120', and includes a coil frame 210' sleeved on the stationary iron core 120', a coil 220' wound on the coil frame 210', a gasket 230' pressed on the coil frame 210', and other components. Outside the coil assembly, a first shell 310' is molded (the step seat 311' is also formed by injection molding during the process of forming the first shell 310'); outside the moving iron core 110', a second shell 320' is arranged. The first shell 310' is provided with an air port (not specifically shown in the figure, the air port provided in the first shell 310' is, for example, the air outlet of the solenoid valve, but not limited to this, it can also be the air inlet of the solenoid valve, and the air port provided in the first shell 310' will be described as an example below), and the second shell 320' is provided with an air port (not specifically shown in the figure, the air port provided in the second shell 320' is, for example, the air inlet of the solenoid valve, but not limited to this, it can also be the air outlet of the solenoid valve, the first shell 310' and the second shell 320' can be provided with an air inlet and an air outlet respectively, and the air port provided in the second shell 320' will be described as an example below). A gas channel, such as an exhaust channel 430', is provided in the static iron core 120'.

[0004] The working principle of the solenoid valve is as follows: the moving iron core 110' can be switched between two working positions. In the first working position, one end of the moving iron core 110' blocks the exhaust channel 430', so that the air inlet and the air outlet of the solenoid valve are connected; the moving iron core 110' can be moved to the first working position under the action of the coil 220', and in this process, different parts of the step seat 311' respectively limit the moving iron core 110' and the spring 130' to prevent the moving iron core 110' from contacting the static iron core 120', and to prevent the spring 130' from being over-compressed and losing its return function. In the second working position, the other end of the moving iron core 110' blocks the air inlet, so that the exhaust channel 430' and the air outlet are connected; the moving iron core 110' can be moved to the second working position under the action of the spring 130'.

[0005] In addition, to seal the air path, a first sealing ring 241 ′ and a second sealing ring 242 ′ are respectively provided inside and outside the coil frame 210 ′. The first sealing ring 241 ′ is pressed by the gasket 230 ′, and the second sealing ring 242 ′ is pressed by the step seat 311 ′.

[0006] The current solenoid valve has the following problems:

[0007] Since the step seat 311' needs to be formed on the coil frame 210', the sealing ring, especially the second sealing ring 242' needs to be pre-installed before injection molding. During injection molding, the high temperature and high pressure injection position is close to the sealing ring, which is easy to cause aging of the sealing ring, thereby affecting the sealing performance of the solenoid valve.

[0008] There is a gap between the step seat 311 ′ and the static iron core 120 ′. During the operation of the solenoid valve, the spring 130 ′ is easily displaced and stuck in the gap, thus affecting the normal operation of the moving iron core.

[0009] The winding window of the coil frame 210' is relatively compact, resulting in insufficient electromagnetic force of the solenoid valve; if a solenoid valve with greater electromagnetic force is desired, the size can only be enlarged to increase the winding window, which will increase the overall size and interface size of the entire solenoid valve, affecting the layout and installation of the solenoid valve in the vehicle.

[0010] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Utility Model Content

[0011] In view of this, the utility model provides a solenoid valve, which solves the problem of aging of the injection-molded sealing ring by improving the coil skeleton and gasket of the solenoid valve, avoids position displacement of the spring, and increases the winding window without changing the outline size and interface size of the solenoid valve.

[0012] One aspect of the utility model provides a solenoid valve, comprising a moving iron core and a stationary iron core arranged relatively to each other, a spring elastically supporting the moving iron core, a coil assembly arranged outside the stationary iron core, and a first shell plastic-coated outside the coil assembly, wherein the coil assembly comprises a coil frame and a gasket sleeved on the stationary iron core; wherein: the gasket is axially engaged with the end face of the coil frame; the end face of the coil frame and / or the gasket limit the moving iron core and the spring in the axial direction, and the end face of the coil frame and / or the gasket limit the spring in the radial direction.

[0013] In some embodiments, the end surface of the coil skeleton is provided with a first support portion protruding toward the washer, and the first support portion passes through the slot hole of the washer; the end surface of the first support portion limits the moving iron core in the axial direction, and the side wall of the first support portion limits the spring in the radial direction.

[0014] In some embodiments, the gasket is provided with a second support portion protruding toward the end face of the coil skeleton, and the second support portion is inserted into the end face groove of the coil skeleton; the bottom surface of the second support portion limits the spring in the axial direction, the side wall of the second support portion limits the spring in the radial direction, and the inner ring end face of the second support portion limits the moving iron core in the axial direction.

[0015] In some embodiments, the second supporting portion is formed as an annular groove structure, and the gasket is formed as a V-shaped structure with the slot hole on the inner side wall.

[0016] In some embodiments, the end surface of the coil skeleton is also provided with a third support portion protruding toward the washer and connected to the first support portion to form a step portion; the slot exposes the step portion, and the washer and the third support portion limit the spring in the axial direction.

[0017] In some embodiments, the gasket is formed as a planar annular structure with the slotted hole.

[0018] In some embodiments, the first support portion includes a plurality of first support portions that are circumferentially spaced apart.

[0019] In some embodiments, a first sealing ring is installed on the inner wall of the end surface of the coil skeleton, and the inner circumference of the gasket covers the first sealing ring.

[0020] In some embodiments, a second sealing ring is installed on the outer wall of the end surface of the coil skeleton, and the outer periphery of the gasket presses the second sealing ring.

[0021] Compared with the prior art, the beneficial effects of the present invention include at least:

[0022] By axially fitting the washer and the end face of the coil frame, the space occupied by the washer and the end face of the coil frame in the axial direction is compressed, thereby increasing the space occupied by the body of the coil frame (winding window); in this way, the winding and electromagnetic force of the solenoid valve can be optimized without changing the outline size and interface size of the solenoid valve, providing feasibility for upgrading the solenoid valve. In addition, the design of fitting the end face of the coil frame with the washer makes the assembly structure of the two stable and reliable, thereby ensuring the stability of the solenoid valve.

[0023] The end face and / or washer of the coil skeleton limit the movable iron core in the axial direction, and the end face and / or washer of the coil skeleton limit the spring in the axial direction, so there is no need to form an injection molding structure for limiting the movable iron core and the spring on the coil skeleton, so the sealing ring does not need to be pre-installed before the injection molding process, and can be installed after the injection molding is completed and before the washer is installed, effectively avoiding the problem of aging of the sealing ring formed by injection molding, and ensuring the sealing performance of the solenoid valve. In addition, the end face and / or washer of the coil skeleton replace the injection molding structure to limit the movable iron core and the spring, so that the high-temperature and high-pressure injection molding position is far away from the sealing ring installation position, avoiding the thermal deformation of the sealing ring installation position.

[0024] The spring is radially limited by the end face of the coil skeleton and / or the washer to avoid positional displacement of the spring during the operation of the solenoid valve, thereby ensuring the normal movement of the moving iron core and further ensuring the normal operation of the solenoid valve.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the accompanying drawings described below are only some embodiments of the present utility model, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0027] Figure 1 A partial structural schematic diagram of an existing solenoid valve is shown;

[0028] Figures 2 to 4 A partial structural schematic diagram of a solenoid valve in an embodiment of the utility model is shown;

[0029] Figures 5 to 7 A partial structural schematic diagram of a solenoid valve in another embodiment of the utility model is shown. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided to make the present invention comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art.

[0031] The accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.

[0032] In the description of the present invention, the terms "top", "bottom", "upper", "lower", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The terms "first", "second" and similar terms used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components. In addition, the term "plurality" means two or more, unless otherwise clearly and specifically defined.

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in different embodiments may be combined with each other.

[0034] Figures 2 to 4 The partial structure of the solenoid valve in one embodiment of the utility model is shown in FIG. Figures 5 to 7 The partial structure of the solenoid valve in another embodiment of the utility model is shown; Figures 2 to 7 As shown, the solenoid valve provided by the embodiment of the utility model includes:

[0035] The movable iron core 110 and the stationary iron core 120 are arranged opposite to each other, the spring 130 elastically supporting the movable iron core 110, the coil assembly arranged outside the stationary iron core 120 and the first shell 310 coated with plastic outside the coil assembly, the coil assembly includes a coil frame 210 and a gasket 230 sleeved on the stationary iron core 120;

[0036] The washer 230 is fitted with the end surface 218 of the coil frame 210 in the axial direction Z;

[0037] The end surface 218 of the coil skeleton 210 and / or the washer 230 limit the movable iron core 110 and the spring 130 in the axial direction Z, and the end surface 218 of the coil skeleton 210 and / or the washer 230 limit the spring 130 in the radial direction X.

[0038] The main structure of the solenoid valve can refer to Figure 1 The embodiment of the utility model mainly describes the structural changes of the coil skeleton 210 and the washer 230 and the resulting changes in the limiting structure of the moving iron core 110 and the spring 130, and the changes in the assembly process of the electromagnetic valve.

[0039] In an embodiment of the utility model, the limiting support of the moving iron core 110 in the axial direction Z can be achieved by the end face 218 of the coil skeleton 210, or by the gasket 230, or by the end face 218 of the coil skeleton 210 and the gasket 230; specifically, when the gasket 230 is engaged with the end face 218 of the coil skeleton 210 in the axial direction Z, a support portion that is compatible with the moving iron core 110 and can limit the moving iron core 110 in the axial direction Z can be provided on the gasket 230, and / or a support portion that is compatible with the moving iron core 110 and can limit the moving iron core 110 in the axial direction Z can be provided on the end face 218 of the coil skeleton 210, thereby achieving the limit positioning of the moving iron core 110 in the axial direction Z by the end face 218 of the coil skeleton 210 and / or the gasket 230. The limiting support of the spring 130 in the axial direction Z can be achieved by the end face 218 of the coil skeleton 210, or by the washer 230, or by the end face 218 of the coil skeleton 210 and the washer 230; specifically, when the washer 230 is engaged with the end face 218 of the coil skeleton 210 in the axial direction Z, a support portion that is compatible with the spring 130 and can limit the spring 130 in the axial direction Z can be provided on the washer 230, and / or a support portion that is compatible with the spring 130 and can limit the spring 130 in the axial direction Z can be provided on the end face 218 of the coil skeleton 210, thereby achieving the limit support of the spring 130 in the axial direction Z by the end face 218 of the coil skeleton 210 and / or the washer 230. Furthermore, the limiting support of the spring 130 in the radial direction X can be achieved by the end face 218 of the coil skeleton 210, or by the washer 230, or by the end face 218 of the coil skeleton 210 and the washer 230; specifically, when the washer 230 is engaged with the end face 218 of the coil skeleton 210 in the axial direction Z, a support portion that is compatible with the spring 130 and can limit the spring 130 in the radial direction X can be provided on the washer 230, and / or a support portion that is compatible with the spring 130 and can limit the spring 130 in the radial direction X can be provided on the end face 218 of the coil skeleton 210, thereby achieving the limit support of the spring 130 in the radial direction X by the end face 218 of the coil skeleton 210 and / or the washer 230.

[0040] By fitting the washer 230 with the end face 218 of the coil frame 210 in the axial direction Z, the space occupied by the washer 230 and the end face 218 of the coil frame 210 in the axial direction Z is compressed, thereby increasing the space occupied by the body of the coil frame 210 (i.e., the winding window, where the coil 220 is wound); in this way, the winding and electromagnetic force of the solenoid valve can be optimized without changing the outline size and interface size of the solenoid valve, providing feasibility for upgrading the solenoid valve. In addition, the design of fitting the end face 218 of the coil frame 210 with the washer 230 makes the assembly structure of the two stable and reliable, thereby ensuring the stability of the solenoid valve.

[0041] The end face 218 of the coil skeleton 210 and / or the gasket 230 limit the moving iron core 110 and the spring 130 in the axial direction Z, and there is no need to form an injection molding structure for limiting the moving iron core 110 and the spring 130 on the coil skeleton 210, so that the sealing ring (including the first sealing ring 241 and the second sealing ring 242) does not need to be pre-installed before the injection molding process, and can be installed after the injection molding is completed and before the gasket 230 is installed, effectively avoiding the problem of aging of the sealing ring formed by injection molding, and ensuring the sealing performance of the solenoid valve. In addition, the end face 218 of the coil skeleton 210 and / or the gasket 230 replace the injection molding structure to limit the moving iron core 110 and the spring 130, so that the high-temperature and high-pressure injection molding position is far away from the sealing ring installation position, avoiding the thermal deformation of the sealing ring installation position.

[0042] The spring 130 is limited in the radial direction X by the end face 218 of the coil skeleton 210 and / or the washer 230, so as to avoid the position deviation of the spring 130 during the operation of the solenoid valve, ensure the normal operation of the moving iron core 110, and further ensure the normal operation of the solenoid valve. Specifically, the moving iron core 110 can move to the first working position under the action of the coil 220, at which time one end of the moving iron core 110 blocks the exhaust channel 430, so that the air inlet and the air outlet of the solenoid valve are connected. In this process, the end face 218 of the coil skeleton 210 and / or the washer 230 limit the moving iron core 110 and the spring 130 in the axial direction Z to avoid the moving iron core 110 from contacting the static iron core 120, and to avoid the spring 130 from being over-compressed and losing the return function, and the end face 218 of the coil skeleton 210 and / or the washer 230 limit the spring 130 in the radial direction X to avoid the position deviation of the spring 130 and the inability to effectively play the return function. Furthermore, the moving iron core 110 can move to the second working position under the action of the spring 130 , at which time the other end of the moving iron core 110 blocks the air inlet, so that the exhaust channel 430 is connected to the air outlet.

[0043] Combination Figures 2 to 7 As shown, in some embodiments, the end face 218 of the coil skeleton 210 is provided with a first support portion 211 protruding toward the washer 230, and the first support portion 211 passes through the slot of the washer 230; the end face of the first support portion 211 limits the moving iron core 110 in the axial Z direction, and the side wall of the first support portion 211 limits the spring 130 in the radial X direction.

[0044] The first support portion 211 passes through the slot of the washer 230, so that the washer 230 is engaged with the end face 218 of the coil skeleton 210 in the axial direction Z. The first support portion 211 may specifically include a plurality of circumferentially spaced apart structures, for example, the first support portion 211 may form a two-claw structure, a three-claw structure, etc., depending on the end face structure of the moving iron core 110, so as to achieve position-limiting support for the moving iron core 110 in the axial direction Z. In addition, the side wall of the first support portion 211 can also play the role of limiting the spring 130 in the radial direction X, so as to prevent the spring 130 from being offset.

[0045] Combination Figures 2 to 4 As shown, in some embodiments, the washer 230 is provided with a second support portion 232 protruding toward the end face 218 of the coil skeleton 210, and the second support portion 232 falls into the end face groove of the coil skeleton 210; the bottom surface of the second support portion 232 limits the spring 130 in the axial Z direction, the side wall of the second support portion 232 limits the spring 130 in the radial X direction, and the inner ring end face 233 of the second support portion 232 limits the moving iron core 110 in the axial Z direction.

[0046] The second support portion 232 falls into the end face groove of the coil skeleton 210, so that the washer 230 and the end face 218 of the coil skeleton 210 are embedded in the axial direction Z. The second support portion 232 can be specifically formed as an annular groove structure, or other groove structures adapted to the spring 130, so as to use the bottom surface to provide a reliable limiting support function for the spring 130 in the axial direction Z, and use the side wall to limit the spring 130 in the radial direction X to prevent the spring 130 from positional displacement. In addition, the inner ring end face 233 of the second support portion 232 can also cooperate with the end face of the first support portion 211 to limit the movable iron core 110 in the axial direction Z.

[0047] exist Figures 2 to 4 In the illustrated embodiment, the gasket 230 may be formed into a V-shaped structure with a slotted hole on the inner side wall, so that the first support portion 211 of the coil frame 210 passes through the slotted hole on the inner side wall of the gasket 230, and the second support portion 232 of the gasket 230 falls into the end surface groove of the coil frame 210, thereby realizing an extremely stable assembly structure between the gasket 230 and the coil frame 210. Such a fitting design pushes the top of the winding window of the coil frame 210 upward by at least 2.81 mm, and the bottom of the winding window of the coil frame 210 can be pushed down by about 0.44 mm, thereby expanding the winding window of the coil frame 210 by about 3.25 mm in the axial direction Z, thereby effectively increasing the winding window in a limited space, so as to optimize the winding and electromagnetic force of the solenoid valve, and provide feasibility for upgrading the solenoid valve.

[0048] In addition, Figures 2 to 4 In the illustrated embodiment, the end face of the first support portion 211 and the inner ring end face 233 of the second support portion 232 are used to jointly limit the moving iron core 110 in the axial direction Z, the bottom face of the second support portion 232 is used to limit the spring 130 in the axial direction Z, and the side wall of the first support portion 211 and the side wall of the second support portion 232 are used to jointly limit the spring 130 in the radial direction X, thereby achieving a stable and reliable limiting support effect on the moving iron core 110 and the spring 130.

[0049] Combination Figures 5 to 7As shown, in some embodiments, the end face 218 of the coil skeleton 210 is also provided with a third support portion 213 which protrudes toward the washer 230 and is connected to the first support portion 211 to form a stepped portion; the slot hole of the washer 230 exposes the stepped portion, and the washer 230 and the third support portion 213 limit the spring 130 in the axial Z direction.

[0050] The slot of the washer 230 exposes a stepped portion, so that the washer 230 is engaged with the end surface 218 of the coil frame 210 in the axial direction Z. The washer 230 can be formed as a planar annular structure with a slot, so as to cooperate with the third support portion 213 to limit the support spring 130 in the axial direction Z.

[0051] exist Figures 5 to 7 In the illustrated embodiment, the first support portion 211 and the third support portion 213 of the coil skeleton 210 pass through the slots of the gasket 230, so that the gasket 230 is engaged with the end face 218 of the coil skeleton 210. Such engagement causes the top of the winding window of the coil skeleton 210 to be pushed up by about 1.65 mm, and the bottom of the winding window of the coil skeleton 210 to be pushed down by about 0.44 mm, thereby expanding the winding window of the coil skeleton 210 by about 2.09 mm in the axial direction Z, thereby effectively increasing the winding window in a limited space, so as to optimize the winding and electromagnetic force of the solenoid valve, and provide feasibility for upgrading the solenoid valve.

[0052] In addition, Figures 5 to 7 In the illustrated embodiment, the end face of the first support portion 211 is utilized to limit the movable iron core 110 in the axial direction Z, the washer 230 and the third support portion 213 are utilized to jointly limit the spring 130 in the axial direction Z, and the side wall of the first support portion 211 is utilized to limit the spring 130 in the radial direction X, thereby also realizing an effective limiting support function for the movable iron core 110 and the spring 130.

[0053] In other embodiments, the washer 230 and the end face 218 of the coil skeleton 210 may have other structural features, as long as the washer 230 and the end face 218 of the coil skeleton 210 are interlocked in the axial direction Z, the end face 218 of the coil skeleton 210 and / or the washer 230 limit the moving iron core 110 and the spring 130 in the axial direction Z, and the end face 218 of the coil skeleton 210 and / or the washer 230 limit the spring 130 in the radial direction X.

[0054] Furthermore, combined with Figures 2 to 7As shown, the inner wall of the end face of the coil skeleton 210 is installed with a first sealing ring 241, and the inner circumference of the gasket 230 presses the first sealing ring 241; the outer wall of the end face of the coil skeleton 210 is installed with a second sealing ring 242, and the outer circumference of the gasket 230 presses the second sealing ring 242. Through the cooperation between the sealing ring groove of the coil skeleton 210 and the inner and outer circumferences of the gasket 230, the first sealing ring 241 and the second sealing ring 242 are stably assembled to ensure the sealing of the gas path of the solenoid valve. In addition, by pressing the first sealing ring 241 and the second sealing ring 242 with the gasket 230, the high-temperature and high-pressure injection molding position is far away from the sealing ring installation position, avoiding the sealing ring installation position from being deformed by heat.

[0055] Furthermore, combined with Figures 2 to 7 As shown, the solenoid valve of the utility model can be assembled through the following process.

[0056] The component to be coated with plastic is obtained, and the component to be coated with plastic includes a coil frame 210 sleeved outside the static iron core 120. In addition, a coil 220 can be wound on the coil frame 210, and a yoke 140 can be arranged outside the coil frame 210.

[0057] The first shell 310 is formed by overmolding the component to be overmolded. The first shell 310 can be formed by placing the component to be overmolded into a mold for injection molding.

[0058] A sealing ring is installed on the end surface 218 of the coil frame 210 . The sealing ring includes a first sealing ring 241 and a second sealing ring 242 .

[0059] The washer 230 is welded to the end face 218 of the coil skeleton 210, so that the washer 230 and the end face 218 of the coil skeleton 210 are embedded in the axial direction Z. By embedding the washer 230 and the end face 218 of the coil skeleton 210 in the axial direction Z, the space occupied by the washer 230 and the end face 218 of the coil skeleton 210 in the axial direction Z is compressed, thereby increasing the space occupied by the winding window of the coil skeleton 210; in this way, the winding and electromagnetic force of the solenoid valve can be optimized without changing the outline size and interface size of the solenoid valve, providing feasibility for the upgrade of the solenoid valve. In addition, the design of the embedding of the end face 218 of the coil skeleton 210 and the washer 230 makes the assembly structure of the two stable and reliable, thereby ensuring the stability of the solenoid valve.

[0060] The movable iron core 110 and the spring 130 are assembled so that the end surface 218 of the coil frame 210 and / or the washer 230 limit the movable iron core 110 and the spring 130 in the axial direction Z, and the end surface 218 of the coil frame 210 and / or the washer 230 limit the spring 130 in the radial direction X. In addition to the movable iron core 110 and the spring 130, a second housing 320 may also be provided.

[0061] The end face 218 of the coil skeleton 210 and / or the washer 230 limit the moving iron core 110 and the spring 130 in the axial direction Z, and there is no need to form an injection molding structure for limiting the moving iron core 110 and the spring 130 on the coil skeleton 210, so the first sealing ring 241 and the second sealing ring 242 do not need to be pre-installed before the injection molding process, and can be installed after the injection molding is completed and before the washer 230 is installed, effectively avoiding the problem of aging of the injection-molded sealing ring and ensuring the sealing performance of the solenoid valve. In addition, the end face 218 of the coil skeleton 210 and / or the washer 230 replace the injection molding structure to limit the moving iron core 110 and the spring 130, so that the high-temperature and high-pressure injection molding position is far away from the sealing ring installation position, avoiding the thermal deformation of the sealing ring installation position.

[0062] The spring 130 is limited in the radial direction X by the end surface 218 of the coil skeleton 210 and / or the washer 230 to avoid positional displacement of the spring 130 during the operation of the solenoid valve, thereby ensuring the normal operation of the moving iron core 110 and further ensuring the normal operation of the solenoid valve. When the solenoid valve is working, the moving iron core 110 can move to the first working position under the action of the coil 220, at which time one end of the moving iron core 110 blocks the exhaust channel 430, so that the air inlet (which can be set in the second housing 320) and the air outlet (which can be set in the first housing 310) of the solenoid valve are connected. In this process, the end face 218 of the coil skeleton 210 and / or the washer 230 limit the moving iron core 110 and the spring 130 in the axial Z direction to prevent the moving iron core 110 from contacting the static iron core 120, and to prevent the spring 130 from being over-compressed and losing the return function, and the end face 218 of the coil skeleton 210 and / or the washer 230 limit the spring 130 in the radial direction X direction to prevent the spring 130 from being offset and unable to effectively play the return function. Further, the moving iron core 110 can move to the second working position under the action of the spring 130, at which time the other end of the moving iron core 110 blocks the air inlet, so that the exhaust channel 430 and the air outlet are connected.

[0063] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A solenoid valve, comprising a moving iron core and a stationary iron core arranged opposite to each other, a spring elastically supporting the moving iron core, a coil assembly arranged outside the stationary iron core, and a first shell plastic-coated outside the coil assembly, wherein the coil assembly comprises a coil frame and a gasket sleeved on the stationary iron core; characterized in that: The washer is engaged with the end surface of the coil frame in the axial direction; The end surface of the coil skeleton and / or the washer limit the movable iron core and the spring in the axial direction, and the end surface of the coil skeleton and / or the washer limit the spring in the radial direction.

2. The solenoid valve according to claim 1, characterized in that The end surface of the coil skeleton is provided with a first supporting portion protruding toward the washer, and the first supporting portion passes through the slot hole of the washer; The end surface of the first support portion limits the movable iron core in the axial direction, and the side wall of the first support portion limits the spring in the radial direction.

3. The solenoid valve according to claim 2, characterized in that: The washer is provided with a second support portion protruding toward the end surface of the coil skeleton, and the second support portion is inserted into the end surface groove of the coil skeleton; The bottom surface of the second support portion limits the spring in the axial direction, the side wall of the second support portion limits the spring in the radial direction, and the inner ring end surface of the second support portion limits the moving iron core in the axial direction.

4. The solenoid valve according to claim 3, characterized in that: The second supporting portion is formed as an annular groove structure, and the gasket is formed as a V-shaped structure with the slot hole on the inner side wall.

5. The solenoid valve according to claim 2, characterized in that: The end surface of the coil skeleton is also provided with a third support portion protruding toward the washer and connected to the first support portion to form a step portion; The slot exposes the stepped portion, and the washer and the third support portion limit the spring in the axial direction.

6. The solenoid valve according to claim 5, characterized in that The gasket is formed into a planar annular structure with the slotted hole.

7. The solenoid valve according to claim 2, characterized in that: The first supporting parts include a plurality of first supporting parts distributed at intervals in the circumferential direction.

8. The solenoid valve according to claim 1, characterized in that A first sealing ring is installed on the inner wall of the end surface of the coil frame, and the inner circumference of the gasket presses the first sealing ring.

9. The solenoid valve according to claim 1, characterized in that: A second sealing ring is installed on the outer wall of the end surface of the coil frame, and the outer circumference of the gasket presses the second sealing ring.

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