Air inflation solenoid valve

Abstract

This invention provides an inflation solenoid valve. One end of the valve stem body is connected to a moving iron core via a connecting part, and the other end of the valve stem body is connected to an inflation port plug. A moving channel is provided on the valve body, and a sealing element and a limiting plug are installed within the moving channel. The valve stem body is sealed to the inner wall of the moving channel via the sealing element, allowing the valve stem body to move within the moving channel. The space where the inflation port plug is located is a first space, and the spaces where the moving and stationary iron cores are located are a second space. The first and second spaces are mutually sealed and isolated by the valve stem body and the sealing element. This invention, by providing a sealing element, prevents back-inflation gas from entering the space where the iron core is located. Simultaneously, within the space where the plug is located, the upper equivalent force-bearing surface of the plug is smaller than the lower equivalent force-bearing surface, thus ensuring that back-inflation generates upward pressure. Under this premise, it allows for a larger inflation port.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, specifically to an air-filling solenoid valve. Background Technology

[0002] Existing inflation solenoid valves for inflating elastic airbags exhibit a phenomenon where, during the valve's operating cycle, after inflating the elastic airbag, the gas inside the airbag is recirculated back into the solenoid valve housing. Figure 1 As shown, when inflation stops, gas will be back-inflated from position A. As shown at position B in the figure, there is an upper equivalent pressure bearing surface at the iron core end of the valve core assembly inside the solenoid valve housing, generating pressure that hinders the opening of the inflation port plug. As shown at position C in the figure, there is a lower equivalent pressure bearing surface at the plug end of the valve core assembly inside the solenoid valve housing, which contacts the inflation port, generating pressure that pushes the inflation port plug open. Generally, the upper equivalent pressure bearing surface is larger than the lower equivalent pressure bearing surface. Figure 2 As shown, pressure will be generated on surface B1 along the valve stem movement direction, hindering the opening of the inflation port plug. Surfaces C1, C2, C3, C4, C5, C6, C7, and C8 will all generate pressure along the valve stem movement direction, pushing the inflation port plug open. Figure 2 As shown in D, the difference between the upper and lower equivalent pressure bearing surfaces can be approximately equal to the cross-sectional size of the solenoid valve's charging port. Because of the existence of surface D, the sum of the equivalent bearing surfaces of surfaces C1 to C8 along the valve stem movement direction is less than the equivalent bearing surface of surface B1 along the valve stem movement direction. Therefore, the larger the solenoid valve's charging port is, the greater the pressure difference between the two. When the pressure difference exceeds a certain value, it will cause the charging port plug of the valve core assembly to be unable to be properly lifted, thus causing the solenoid valve to fail to open normally. Therefore, the charging ports of existing solenoid valves are generally small, but small charging ports cannot meet the current demand for high charging efficiency.

[0003] Patent document CN222859159U discloses a gas distribution valve and an automotive suspension chassis, including: a gas delivery structure and a solenoid valve structure; the solenoid valve structure includes a magnetic shielding sleeve, a valve core, and a valve core drive assembly; the valve core is disposed within the magnetic shielding sleeve, and the valve core is drivenly connected to the valve core drive assembly; the magnetic shielding sleeve has an air inlet groove, the opening end of which is sealed to the first gas delivery channel of the gas delivery structure; the bottom of the air inlet groove has a solenoid valve air inlet; the magnetic shielding sleeve has a solenoid valve air outlet, which is sealed to the second gas delivery channel of the gas delivery structure; the valve core can open and close the solenoid valve air inlet through the valve core drive assembly. However, this patent document still has the drawback of having a small inflation port, which cannot meet the current demand for high inflation efficiency. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide an air-filling solenoid valve.

[0005] According to the present invention, an inflatable solenoid valve includes: a housing, a coil assembly, a yoke, and a valve core assembly;

[0006] The coil sub-assembly, the yoke, and the valve core assembly are disposed within the housing, and the yoke and the valve core assembly are mounted on the coil sub-assembly;

[0007] The valve core assembly includes: valve body, valve seat, valve stem, moving iron core, stationary iron core, and spring;

[0008] The valve stem includes: a moving iron core connecting part, a valve stem body part, and an air inlet plug; one end of the valve stem body part is connected to the moving iron core through the moving iron core connecting part, and the other end of the valve stem body part is connected to the air inlet plug;

[0009] The valve body is provided with a moving channel; the main body of the valve stem is disposed in the moving channel and is sealed to the inner wall of the moving channel by a sealing element; the main body of the valve stem is capable of moving within the moving channel;

[0010] The space where the air inlet plug is located is the first space, and the space where the moving iron core and the stationary iron core are located is the second space. The first space and the second space are mutually sealed and isolated by the valve stem body and the sealing element.

[0011] The projected area of ​​the valve stem body on the air inlet plug along the direction of valve stem movement is greater than the projected area of ​​the air inlet on the valve seat on the air inlet plug along the direction of valve stem movement.

[0012] Preferably, a protruding structure is formed on the bottom side wall of the valve seat in the direction of approaching the air inlet plug, corresponding to the position of the air inlet plug;

[0013] The air inlet plug forms a gap between the protruding structure and the bottom sidewall of the valve seat;

[0014] The air inlet is located on the protruding structure.

[0015] Preferably, the moving iron core connecting part, the valve stem body part, and the air inlet plug are integrally formed.

[0016] Preferably, the inflation port plug includes a plug mounting structure and a rubber plug;

[0017] The plug mounting structure is connected to the valve stem body, and the rubber plug is mounted on the plug mounting structure to block the air inlet.

[0018] Preferably, the plug mounting structure is provided with a limiting groove, and the rubber plug is provided with a limiting protrusion;

[0019] The plug mounting structure and the rubber plug are fixed and limited by the limiting groove and the limiting protrusion.

[0020] Preferably, a limit plug is provided in the moving channel, and a stepped structure is provided on the valve body;

[0021] The sealing element is fixed between the stepped structure and the limiting plug, and the valve stem body and the sealing element can move relative to each other.

[0022] Preferably, a sealing element mounting groove is provided on the valve stem body;

[0023] The seal is installed in the seal mounting groove and is movable within the moving channel.

[0024] Preferably, the valve body and the valve seat are mounted on the yoke;

[0025] The valve body is installed inside the valve seat, and the valve stem is installed on the valve body and is movable on the valve body;

[0026] A spring is provided between the air inlet plug and the valve body, and the spring is used to generate resistance when the air inlet plug is opened.

[0027] Preferably, the coil sub-assembly includes a coil frame and copper wire;

[0028] The copper wire is wound around the coil frame, and the yoke is mounted on the coil frame;

[0029] The coil frame is provided with an iron core channel, and the stationary iron core and the moving iron core are installed in the iron core channel;

[0030] The stationary iron core is connected to the yoke, and the moving iron core is connected to the moving iron core connection part.

[0031] Preferably, a magnetic shielding sleeve is provided on the coil frame, the magnetic shielding sleeve is located inside the iron core channel and surrounds the periphery of the moving iron core;

[0032] The inflation solenoid valve also includes a PCB board and pins, with the PCB board connected to the copper wires via the pins.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. This utility model, by setting a sealing element, seals and isolates the first space where the air inlet plug is located, and the second space where the stationary iron core and the moving iron core are located, preventing gas flow between the two spaces. This ensures that any backfilled gas will only exist in the first space and will not flow into the second space. Consequently, no force-bearing surface is generated on the stationary iron core and the moving iron core. The force-bearing surface is mainly located on the air inlet plug in the first space. The force affecting the valve stem movement mainly comes from the force on the surface not parallel to the valve stem movement direction. On the air inlet plug, this is mainly manifested as the force on its upper and lower surfaces. When the air inlet plug is isolated, its upper and lower surfaces are the same. When installed in a solenoid valve, its equivalent air pressure force-bearing surface can be considered as the total upper surface minus the valve stem body. The projection surface of the valve stem body onto the inflation port plug along the valve stem's movement direction is considered as the total lower surface minus the projection surface of the inflation port onto the inflation port plug along the valve stem's movement direction. Since the pressure at the inflation port is zero, the force on the surface in contact with the inflation port is also zero. As long as the projection surface of the valve stem body onto the inflation port plug along the valve stem's movement direction is larger than the projection surface of the inflation port onto the inflation port plug along the valve stem's movement direction, an upward force can be generated during gas backfilling. Under this premise, the inflation port can be further enlarged to achieve higher inflation efficiency.

[0035] 2. The air inlet of this utility model is integrated on the valve seat and integrally formed with the valve seat, which greatly simplifies the structure of the solenoid valve, saves related parts, and reduces manufacturing costs.

[0036] 3. The air inlet plug of this utility model includes a rubber plug part, which seals the air inlet, thereby achieving good sealing performance and also providing good protection for the air inlet. Attached Figure Description

[0037] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of the structure of a solenoid valve in the prior art;

[0039] Figure 2 This is a schematic diagram of the valve core assembly of a solenoid valve in the prior art;

[0040] Figure 3 This is a three-dimensional structural diagram of the inflation solenoid valve in Example 1;

[0041] Figure 4 This is a top view of the inflation solenoid valve in Embodiment 1;

[0042] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along line BB;

[0043] Figure 6 This is a schematic diagram of the valve core assembly in Example 1;

[0044] Figure 7 This is a top view of the valve core assembly in Embodiment 1;

[0045] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along line EE;

[0046] Figure 9 This is a three-dimensional structural diagram of the inflation solenoid valve in Example 2;

[0047] Figure 10 This is a top view of the inflation solenoid valve in Embodiment 2;

[0048] Figure 11 for Figure 10 Schematic diagram of the cross-sectional structure along line AA;

[0049] Figure 12 This is a schematic diagram of the valve core assembly in Example 2;

[0050] Figure 13 for Figure 12 A schematic diagram of the cross-sectional structure along line EE.

[0051] The diagram shows:

[0052] Outer shell 1 Limiting protrusion 43321

[0053] Coil sub-assembly 2 Moving iron core 44

[0054] Coil frame 21, force-bearing surface 441

[0055] Copper wire 22, bottom surface of the second round platform 4411

[0056] Magnetic shielding sleeve 23 Second frustum side surface 4412

[0057] Yoke 3 Second toroidal surface 4413

[0058] Valve core assembly 4, stress protrusion 442

[0059] Valve body 41, stationary iron core 45

[0060] Stepped structure 411 Adsorption surface 451

[0061] Valve seat 42, bottom surface of the first circular platform 4511

[0062] Inflation port 421, side of first truncated cone 4512

[0063] Protruding structure 422 First toroidal surface 4513

[0064] Valve stem 43, suction groove 452

[0065] Moving iron core connection part 431 Spring 46

[0066] Valve stem body 432 Seal 47

[0067] Sealing groove 4321 Limit plug 48

[0068] 433 air inlet plug PCB board 5

[0069] Plug mounting structure 4331 Pin 6

[0070] Rubber plug 4332 Detailed Implementation

[0071] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0072] Example 1:

[0073] like Figures 3 to 8As shown, this embodiment provides an inflatable solenoid valve, including: a housing 1, a coil assembly 2, a yoke 3, and a valve core assembly 4. The coil assembly 2, the yoke 3, and the valve core assembly 4 are disposed inside the housing 1, and the yoke 3 and the valve core assembly 4 are mounted on the coil assembly 2; the valve core assembly 4 includes: a valve body 41, a valve seat 42, a valve stem 43, a moving iron core 44, a stationary iron core 45, and a spring 46; the valve stem 43 includes: a moving iron core connecting part 431, a valve stem main body 432, and an inflation port plug 433; one end of the valve stem main body 432 is connected to the moving iron core 44 through the moving iron core connecting part 431, and the other end of the valve stem main body 432 is connected to the inflation port plug 433; the valve body 41 is provided with a moving channel; the valve stem main body 432... Valve stem body 432 is installed within the moving channel and is sealed to the inner wall of the moving channel via sealing element 47. Valve stem body 432 is movable within the moving channel. The space containing the air inlet plug 433 is the first space, and the spaces containing the moving iron core 44 and the stationary iron core 45 are the second space. The first and second spaces are mutually sealed and isolated by valve stem body 432 and sealing element 47. The projected area of ​​valve stem body 432 on air inlet plug 433 along the moving direction of valve stem 43 is greater than the projected area of ​​air inlet 421 on valve seat 42 on air inlet plug 433 along the moving direction of valve stem 43. The moving iron core connecting part 431, valve stem body 432, and air inlet plug 433 are integrally formed.

[0074] In this embodiment, the valve stem body 432 is a cylindrical structure. The valve stem body 432 is connected to the air inlet plug 433 through a connecting structure. The connecting structure is also a cylindrical structure. The valve stem body 432 is connected to the connecting structure through a sloping step structure. The valve stem body 432 and the connecting structure are coaxially arranged. The diameter of the valve stem body 432 is larger than the diameter of the connecting structure.

[0075] Valve body 41 and valve seat 42 are mounted on yoke 3; valve body 41 is mounted inside valve seat 42, valve stem 43 is mounted on valve body 41 and can move on valve body 41; spring 46 is provided between air inlet plug 433 and valve body 41, spring 46 is used to generate resistance when air inlet plug 433 is opened. Coil sub-assembly 2 includes coil frame 21 and copper wire 22; copper wire 22 is wound on coil frame 21, yoke 3 is mounted on coil frame 21; iron core channel is provided on coil frame 21, stationary iron core 44 and moving iron core 45 are installed in iron core channel; stationary iron core 44 is connected to yoke 3, moving iron core 45 is connected to moving iron core connection part 431. Magnetic shielding sleeve 23 is provided on coil frame 21, magnetic shielding sleeve 23 is located in iron core channel and surrounds the periphery of moving iron core 45; air inlet solenoid valve also includes PCB board 5 and pin 6, PCB board 5 is connected to copper wire 22 through pin 6.

[0076] A protruding structure 422 is formed on the bottom side wall of the valve seat 42, corresponding to the position of the air inlet plug 433, moving towards the air inlet plug 433. A gap is formed between the air inlet plug 433 and the bottom side wall of the valve seat 42 through the protruding structure 422. The air inlet 421 is opened on the protruding structure 422. The air inlet plug 433 includes a plug mounting structure 4331 and a rubber plug 4332. The plug mounting structure 4331 is connected to the valve stem body 432, and the rubber plug 4332 is mounted on the plug mounting structure 4331 to block the air inlet 421. The plug mounting structure 4331 is provided with a limiting groove, and the rubber plug 4332 is provided with a limiting protrusion 43321. The plug mounting structure 4331 and the rubber plug 4332 are limited and fixed by the limiting groove and the limiting protrusion 43321.

[0077] In this embodiment, the plug mounting structure 4331 is a disc structure, and a stepped structure for abutting the spring 46 is provided on the plug mounting structure 4331. The rubber plug 4332 is a disc structure, and the rubber plug 4332 is coaxially arranged with the plug mounting structure 4331. The diameter of the rubber plug 4332 is smaller than the diameter of the plug mounting structure 4331. The plug mounting structure 4331 is coaxially arranged with the valve stem body 432.

[0078] A limit plug 48 is provided in the moving channel, and a stepped structure 411 is provided on the valve body 41; the sealing element 47 is limited and fixed between the stepped structure 411 and the limit plug 48, and the valve stem body 432 and the sealing element 47 can move relative to each other.

[0079] The stationary iron core 45 is provided with an adsorption surface 451, and the moving iron core 44 is provided with a force-receiving surface 441 that can contact the adsorption surface 451. The surface where the adsorption surface 451 and the force-receiving surface 441 can adsorb each other is the effective adsorption surface. The effective adsorption surface is larger than the projection surface of the moving iron core 44 on the stationary iron core 45 along the moving direction of the moving iron core 44, and / or the effective adsorption area is larger than the projection surface of the stationary iron core 45 on the moving iron core 44 along the moving direction of the moving iron core 44. The stationary iron core 45 is provided with an adsorption groove 452, and the inner surface of the adsorption groove 452 is part or all of the adsorption surface 451. The moving iron core 44 is provided with a force-receiving protrusion 442, and the outer surface of the force-receiving protrusion 442 is part or all of the force-receiving surface 441.

[0080] The adsorption groove 442 is a frustum-shaped groove, and the force-receiving protrusion 452 is a frustum-shaped protrusion. The adsorption groove 442 and the force-receiving protrusion 452 are adapted to each other. The adsorption surface 451 is composed of the bottom surface 4511 of the first frustum, the side surface 4512 of the first frustum, and the first annular surface 4513 surrounding the bottom surface of the first frustum. The force-receiving surface 441 is composed of the bottom surface 4411 of the second frustum, the side surface 4412 of the second frustum, and the second annular surface 4413 surrounding the bottom surface of the second frustum.

[0081] This embodiment uses a sealing element to seal and isolate the first space where the inflation port plug is located, and the second space where the stationary iron core and the moving iron core are located. This prevents gas flow between the two spaces, ensuring that the backfilled gas only exists in the first space and does not flow into the second space. Consequently, no force-bearing surface is generated on the stationary iron core and the moving iron core. The force-bearing surface is mainly on the inflation port plug in the first space. The force affecting the valve stem movement mainly comes from the force on the surface that is not parallel to the valve stem movement direction. On the inflation port plug, this is mainly manifested as the force on its upper and lower surfaces. When the inflation port plug is isolated, its upper and lower surfaces are the same. When installed in a solenoid valve, its equivalent air pressure force-bearing surface can be regarded as the total upper surface minus the force on the valve stem body along the upper surface. The projection surface of the valve stem moving in the direction of movement onto the inflation port plug is such that, since there is no force-bearing surface on the valve stem body that is subjected to downward air pressure and / or downward air pressure component, and there is even a part of the force-bearing surface that is subjected to upward air pressure and / or upward air pressure component, its lower equivalent air pressure force-bearing surface can be regarded as the total lower surface minus the projection surface of the inflation port on the inflation port plug along the valve stem moving direction. Since the pressure at the inflation port position is zero, the force on the surface in contact with the inflation port is also zero. As long as the projection surface of the valve stem body on the inflation port plug along the valve stem moving direction is larger than the projection surface of the inflation port on the inflation port plug along the valve stem moving direction, an upward force can be generated during gas backfilling. Under this premise, the inflation port can be further enlarged to achieve higher inflation efficiency.

[0082] During the working cycle of the inflation solenoid valve, after the airbag inflation operation is completed, a crucial but easily overlooked phenomenon occurs: due to the pressure difference, the gas inside the airbag will backflow into the solenoid valve along the inflation passage. This backflowing gas gradually accumulates in the solenoid valve cavity, forming a continuously increasing reverse pressure. The magnitude of this pressure is closely related to the remaining gas volume in the airbag, the sealing degree of the inflation passage, and the characteristics of the gas medium.

[0083] When the system needs to reopen the inflation / deflation plug for inflation or deflation, this reverse air pressure exerts a direct force on the plug. Specifically, the plug attempts to open under the preset driving force, but the air pressure created by the reverse inflation gas applies resistance from the opposite direction, hindering the plug's movement. As the reverse inflation gas pressure increases, this resistance increases accordingly: initially, it may only slightly delay the plug's opening speed, but when the resistance exceeds the maximum output force of the plug's drive mechanism, it will prevent the plug from opening properly, or even cause it to jam. Figure 1 and Figure 2As shown, the interaction surface between the stationary iron core and the moving iron core of the existing inflation solenoid valve is generally the B1 surface at position B. The interaction surface is small, which results in limited attraction of the stationary iron core to the moving iron core. Under the influence of the reverse inflation pressure, it is impossible to ensure that the inflation port plug can always open normally.

[0084] This embodiment increases the interaction surface between the stationary and moving iron cores by setting grooves and protrusions on their working surfaces. This improves the interaction force between the stationary and moving iron cores when the stationary iron core adsorbs the moving iron core, ensuring that the stationary iron core has a sufficiently large suction force on the moving iron core. This allows the moving iron core to drive the valve stem normally, thereby opening the air inlet plug and ensuring that the plug can open normally, avoiding jamming.

[0085] Example 2:

[0086] like Figures 9 to 13 As shown, the difference between this embodiment and Embodiment 1 is that a sealing element mounting groove 4321 is provided on the valve stem body 432; the sealing element 47 is installed in the sealing element mounting groove 4321, and the sealing element 47 can move within the moving channel. The adsorption groove 452 is a cylindrical groove, and the force-bearing protrusion 442 is a frustum-shaped protrusion.

[0087] This invention prevents backfill gas from entering the space where the iron core is located by setting a sealing element. At the same time, in the space where the plug is located, the upper equivalent force-bearing surface of the plug is smaller than the lower equivalent force-bearing surface, so that the gas backfill generates upward pressure. Under this premise, it is possible to make the air inlet larger.

[0088] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0089] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A pneumatic solenoid valve, characterized in that, include: Housing (1), coil assembly (2), yoke (3) and valve core assembly (4); The coil sub-assembly (2), the yoke (3), and the valve core assembly (4) are disposed inside the housing (1), and the yoke (3) and the valve core assembly (4) are mounted on the coil sub-assembly (2); The valve core assembly (4) includes: valve body (41), valve seat (42), valve stem (43), moving iron core (44), stationary iron core (45), and spring (46). The valve stem (43) includes: a moving iron core connecting part (431), a valve stem body part (432), and an air inlet plug (433); one end of the valve stem body part (432) is connected to the moving iron core (44) through the moving iron core connecting part (431), and the other end of the valve stem body part (432) is connected to the air inlet plug (433); The valve body (41) is provided with a moving channel; the valve stem main body (432) is disposed in the moving channel and is sealed to the inner wall of the moving channel by a sealing element (47); the valve stem main body (432) is capable of moving within the moving channel; The space where the air inlet plug (433) is located is the first space, and the space where the moving iron core (44) and the stationary iron core (45) are located is the second space. The first space and the second space are mutually sealed and isolated by the valve stem body (432) and the sealing element (47). The projected area of ​​the valve stem body (432) on the air inlet plug (433) along the moving direction of the valve stem (43) is greater than the projected area of ​​the air inlet (421) on the valve seat (42) on the air inlet plug (433) along the moving direction of the valve stem (43).

2. The air-filling solenoid valve according to claim 1, characterized in that, On the bottom side wall of the valve seat (42), a protruding structure (422) is formed in the direction of the air inlet plug (433) corresponding to the position of the air inlet plug (433). The air inlet plug (433) forms a gap between the protruding structure (422) and the bottom sidewall of the valve seat (42); The air inlet (421) is located on the protruding structure (422).

3. The inflation solenoid valve according to claim 1, characterized in that, The moving iron core connecting part (431), the valve stem main body part (432), and the air inlet plug (433) are integrally formed.

4. The air-filling solenoid valve according to claim 1, characterized in that, The air inlet plug (433) includes a plug mounting structure (4331) and a rubber plug (4332). The plug mounting structure (4331) is connected to the valve stem body (432), and the rubber plug (4332) is mounted on the plug mounting structure (4331). The rubber plug (4332) is used to block the air inlet (421).

5. The inflation solenoid valve according to claim 4, characterized in that, The plug mounting structure (4331) is provided with a limiting groove, and the rubber plug (4332) is provided with a limiting protrusion (43321). The plug mounting structure (4331) and the rubber plug (4332) are fixed by the limiting groove and the limiting protrusion (43321).

6. The air-filling solenoid valve according to claim 1, characterized in that, A limit plug (48) is provided in the moving channel, and a stepped structure (411) is provided on the valve body (41). The sealing element (47) is fixed between the stepped structure (411) and the limiting plug (48), and the valve stem body (432) and the sealing element (47) can move relative to each other.

7. The air-filling solenoid valve according to claim 1, characterized in that, A sealing element mounting groove (4321) is provided on the valve stem body (432); The seal (47) is installed in the seal mounting groove (4321) and the seal (47) is movable within the moving channel.

8. The air-filling solenoid valve according to claim 1, characterized in that, The valve body (41) and the valve seat (42) are mounted on the yoke (3); The valve body (41) is installed inside the valve seat (42), and the valve stem (43) is installed on the valve body (41) and is movable on the valve body (41); A spring (46) is provided between the air inlet plug (433) and the valve body (41), and the spring (46) is used to generate resistance when the air inlet plug (433) is opened.

9. The air-filling solenoid valve according to claim 1, characterized in that, The coil sub-assembly (2) includes a coil frame (21) and copper wire (22). The copper wire (22) is wound around the coil frame (21), and the yoke (3) is mounted on the coil frame (21); The coil frame (21) is provided with an iron core channel, and the stationary iron core (45) and the moving iron core (44) are installed in the iron core channel; The stationary iron core (45) is connected to the yoke (3), and the moving iron core (44) is connected to the moving iron core connecting part (431).

10. The air-filling solenoid valve according to claim 9, characterized in that, A magnetic shielding sleeve (23) is provided on the coil frame (21). The magnetic shielding sleeve (23) is located inside the iron core channel and surrounds the periphery of the moving iron core (44). The inflation solenoid valve also includes a PCB board (5) and a pin (6), wherein the PCB board (5) is connected to the copper wire (22) through the pin (6).

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