Iron core structure for air suspension electromagnetic valve

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to an iron core structure for an air suspension electromagnetic valve. Comprising a valve body, an air inlet is formed in the lower end of the valve body and communicated with an inner cavity of the valve body, a movable iron core is arranged in the inner cavity, a static iron core is installed at the upper end of the inner cavity, and an exhaust hole is formed in the static iron core; an axial cavity is formed in the movable iron core, an upper sealing gasket, a guide sleeve and a lower sealing gasket are sequentially arranged in the axial cavity from top to bottom, the upper end of the guide sleeve is sleeved with an upper sealing spring, the lower end of the upper sealing spring is fixedly connected with the guide sleeve, and the upper end of the upper sealing spring extends out of the guide sleeve and abuts against the upper sealing gasket. The upper sealing gasket can move up and down to seal the exhaust hole; the lower sealing gasket abuts against the air inlet hole and is used for opening and closing the air inlet hole. The problem of gas supply conflict of a constant-pressure opening function is solved in the electromagnetic valve assembly, the structure of the movable iron core is improved, the upper sealing gasket moves independently relative to the movable iron core and is not affected by electromagnetic force, and the service life is greatly prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to an iron core structure for an air suspension solenoid valve. Background Art

[0002] The commercial vehicle air suspension system consists of a controller, air spring, solenoid valve assembly, height sensor, air pressure sensor, and remote control. The solenoid valve assembly is a pilot air solenoid valve structure, which uses a low-power electromagnetic force to control the moving iron core to close and open the pilot hole, and then uses the pressure of compressed air to push the main piston to inflate and exhaust the suspension airbag, thereby adjusting the suspension height of the entire vehicle.

[0003] However, existing technologies have the following drawbacks: First, there's the "air competition" problem. As the number of air-consuming systems (such as brakes and transmissions) increases throughout the vehicle, air suspension systems receive a lower priority. Existing solenoid valves lack a high-pressure opening function, preventing them from prioritizing critical systems when air pressure is insufficient. The existing solution involves adding a relief valve to the air circuit, which only opens air when pressure exceeds a specific threshold (e.g., X bar). However, this increases costs, complicates the air circuit structure, and introduces additional risks of leakage and failure.

[0004] On the other hand, the durability of the traditional moving iron core structure is insufficient to meet the high-frequency adjustment requirements of intelligent driving. The moving iron core utilizes a dual rubber seal design: the upper seal relies on electromagnetic compression to achieve a seal. However, this electromagnetic force is subject to significant fluctuations, including vehicle voltage fluctuations (18V to 32V), operating temperature variations, and the resistance of the cone spring. Excessive instantaneous electromagnetic force can impact the upper seal, causing irreversible damage and ultimately seal failure. The lower seal, under the action of the cone spring, must withstand the longitudinal dynamic loads (with a safety factor of 1.3) caused by high-pressure intake air (typically 10-12.5 bar) and road jolts. Long-term, high-frequency operation can easily lead to rubber fatigue cracking. Furthermore, the two large exhaust slots on the side of the moving iron core, designed to accommodate ventilation, weaken the structural strength and increase the clearance between the moving iron core and the bushing. This results in radial runout during movement, exacerbating eccentric wear of the bushing and causing the sealing ring of the upper seal to shift or even intersect, completely losing its sealing performance. The current improvement plan only alleviates the problem by improving material properties (such as the wear resistance of the outer surface of the iron core and the impact resistance of the upper and lower sealing gaskets of the iron core), but fails to fundamentally solve structural design defects such as electromagnetic force fluctuation impact, dynamic seal overload and eccentric wear.

[0005] Therefore, there is an urgent need for an iron core structure for an air suspension solenoid valve to solve the above problems. Summary of the Invention

[0006] In response to the technical problems existing in the prior art, the present invention provides an iron core structure for an air suspension solenoid valve. By improving the constant-pressure opening structure and the iron core structure, a high-pressure opening function is realized in the solenoid valve assembly. At the same time, the sealing and movement stability of the moving iron core are optimized, solving the air supply conflicts and service life bottlenecks of commercial vehicle air suspension systems.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: An iron core structure for an air suspension solenoid valve, comprising: A valve body, wherein the lower end of the valve body is provided with an air inlet hole communicating with the inner cavity thereof, the inner cavity is provided with a moving iron core, and the upper end of the inner cavity is provided with a static iron core, and the static iron core is provided with an exhaust hole; An axial chamber is provided inside the moving iron core, and an upper sealing gasket, a guide sleeve and a lower sealing gasket are provided in the axial chamber from top to bottom. The upper end of the guide sleeve is covered with an upper sealing spring, the lower end of the upper sealing spring is fixedly connected to the guide sleeve, and the upper end extends out of the guide sleeve and abuts against the upper sealing gasket. The upper sealing gasket can move up and down to seal the exhaust hole; the lower sealing gasket abuts against the air inlet hole and can move up and down to seal and open the air inlet hole.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the upper sealing gasket is narrow at the top and wide at the bottom, and the surface shape of the axial chamber at the corresponding position matches the upper sealing gasket, and the upper sealing gasket can move downward relative to the guide sleeve.

[0010] Furthermore, a conical spring is installed between the lower end of the moving iron core and the valve body; The lower end extension section of the movable iron core coaxially passes through the conical inner hole of the conical spring, the central axis of the conical spring coincides with the axis of the movable iron core, and the direction of its elastic force is consistent with the axial movement direction of the movable iron core; The lower end of the conical spring is fixed to the lower end of the inner cavity of the valve body, and the upper end thereof abuts against the bottom surface of the moving iron core.

[0011] Furthermore, a constant pressure spring is sleeved on the lower end of the guide sleeve, the upper end of the constant pressure spring is fixedly connected to the guide sleeve, and the lower end extends out of the guide sleeve and abuts against the lower sealing gasket; the lower sealing gasket can move up and down inside the moving iron core.

[0012] Furthermore, an annular protrusion is provided on the surface of the guide sleeve, the upper surface of the protrusion is fixedly connected to the upper sealing spring, and the lower surface of the protrusion is fixedly connected to the constant pressure spring.

[0013] Furthermore, a plurality of radial exhaust grooves are provided on the outer surface of the moving iron core, the number of the exhaust grooves is greater than two, and the plurality of exhaust grooves are evenly distributed.

[0014] Furthermore, there are four exhaust slots.

[0015] Furthermore, a bushing is provided on the surface of the inner cavity, and the moving iron core is located in the bushing and is clearance-matched with the bushing.

[0016] Furthermore, an annular upper sealing lip is formed at the end of the exhaust hole.

[0017] The beneficial effects of the present invention are: 1. This embodiment independently disposes the upper sealing gasket within the axial chamber of the moving iron core. Driven by the upper sealing spring, the upper sealing gasket is not affected by electromagnetic force fluctuations, especially the greater electromagnetic force generated at high voltage and low temperature. The upper sealing spring operates under the action of elastic force, which is far less than the impact force caused by the electromagnetic force in the prior art. In this embodiment, the electromagnetic force drives the moving iron core to move a fixed distance, which results in a fixed compression distance of the upper sealing spring, generating a constant elastic force. The upper sealing gasket moves relatively independently of the moving iron core and is driven only by the constant elastic force of the upper sealing spring. It is completely isolated from the electromagnetic force, thus avoiding impact damage caused by voltage or temperature fluctuations, extending the service life, and solving the problem of sealing durability.

[0018] 2. In this embodiment, the lower sealing gasket is independently arranged in the axial chamber of the moving iron core, and the lower sealing gasket is only controlled by air pressure and the constant pressure spring. At this time, the electromagnetic force only needs to balance the spring force of the conical spring. When the controller energizes the solenoid valve, the electromagnetic force first overcomes the resistance of the conical spring. Afterwards, if the air inlet pressure exceeds a certain threshold (for example, the working pressure of the brake system after inflation), the thrust generated by the air pressure will be able to overcome the resistance of the constant pressure spring and open the lower sealing gasket. The opened high-pressure gas then enters the working chamber, pushing the main piston to move, thereby inflating the suspension system. The response accuracy of the constant pressure threshold (Xbar) is ensured, and the "gas grabbing" problem is solved from the root of the structure. At the same time, since the constant pressure opening structure is integrated into the solenoid valve, there is no need to set a relief valve as in the prior art, which greatly saves costs.

[0019] 3. The number of exhaust slots in the moving iron core has been increased from two to four, maintaining the same exhaust channel area. This allows each slot to be smaller, resulting in a tighter clearance than before, effectively reducing the problem of uneven wear. This unique moving iron core structure effectively increases the durability of the solenoid valve assembly, significantly extending the service life of the moving iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an iron core structure for an air suspension solenoid valve according to an embodiment of the present invention; Figure 2 Schematic diagram of the structure of the moving iron core according to an embodiment of the present invention.

[0021] Figure 3It is a structural schematic diagram of the solenoid valve assembly in the background technology of the present invention; In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Moving iron core, 2. Cone spring, 3. Lower sealing gasket, 4. Air inlet, 5. Upper sealing gasket, 6. Exhaust port, 7. Guide sleeve, 8. Upper sealing spring, 9. Constant pressure spring, 10. Protrusion, 11. Exhaust groove, 12. Bushing. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0024] In the description of this application, the term "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art will recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0025] Example like Figure 1-2 As shown, this embodiment provides an iron core structure for an air suspension solenoid valve, comprising: The valve body has an air inlet at its lower end, which communicates with its inner cavity. A moving iron core 1 is provided in the inner cavity, and a static iron core is installed at the upper end of the inner cavity. The static iron core has an exhaust hole. A bushing 12 is provided on the surface of the inner cavity, and the moving iron core 1 is located in the bushing 12 and has a clearance fit therewith. An axial chamber is provided inside the moving iron core 1, and an upper sealing gasket 5, a guide sleeve 7 and a lower sealing gasket 3 are provided in the axial chamber from top to bottom. The upper end of the guide sleeve 7 is sleeved with an upper sealing spring 8, and the lower end of the upper sealing spring 8 is fixedly connected to the guide sleeve 7, and the upper end extends out of the guide sleeve 7 and abuts against the upper sealing gasket 5. The upper sealing gasket 5 can move up and down to seal the exhaust hole; the lower sealing gasket 3 abuts against the air inlet hole and can move up and down to seal and open the air inlet hole.

[0026] Wherein, a conical spring 2 is installed between the lower end of the moving iron core 1 and the valve body; Specifically, the lower end extension section of the movable iron core 1 coaxially passes through the conical inner hole of the conical spring 2, the central axis of the conical spring 2 coincides with the axis of the movable iron core 1, and the direction of its elastic force is consistent with the axial movement direction of the movable iron core 1; Specifically, the lower end of the conical spring 2 is fixed to the lower end of the inner cavity of the valve body, and the upper end abuts against the bottom surface of the movable iron core 1. The conical spring 2 ensures that the movable iron core 1 is pressed down, and the electromagnetic force overcomes the elastic force of the conical spring 2, and the movable iron core 1 moves upward.

[0027] In this embodiment, by independently positioning the upper sealing gasket 5 within the axial cavity of the movable iron core 1, the upper sealing gasket 5 is driven by the upper sealing spring 8 and is not affected by electromagnetic force fluctuations, particularly the greater electromagnetic force generated at high voltage and low temperatures. It operates under the elastic force of the upper sealing spring 8, which is significantly less than the inflation caused by the electromagnetic force. The electromagnetic force drives the movable iron core 1, which moves a fixed distance, causing the upper sealing spring 8 to compress a fixed distance, generating a constant elastic force. The upper sealing gasket 5 moves relatively independently of the movable iron core 1, driven only by the constant elastic force of the upper sealing spring 8 and completely isolated from the electromagnetic force. This prevents damage from voltage or temperature fluctuations, extends its lifespan, and addresses the issue of seal durability.

[0028] In this embodiment, the lower sealing gasket 3 is independently arranged in the axial cavity of the moving iron core 1. The lower sealing gasket 3 is only controlled by the air pressure and the constant pressure spring 9, and the electromagnetic force does not participate in its movement, thereby ensuring the response accuracy of the constant pressure threshold (Xbar) and solving the "air grabbing" problem from the structural root.

[0029] In one possible embodiment, the upper sealing gasket 5 is narrow at the top and wide at the bottom, and the surface shape of the axial chamber at the corresponding position matches the upper sealing gasket 5, and the upper sealing gasket 5 can move downward relative to the guide sleeve 7. The end of the exhaust hole forms an annular upper sealing lip.

[0030] In this embodiment, the upper sealing gasket 5 is designed to be narrow at the top and wide at the bottom, ensuring that the upper sealing gasket 5 does not move upward relative to the moving iron core 1, so as to ensure that it can be subjected to the elastic force of the upper sealing spring 8 to seal the exhaust hole.

[0031] In one possible embodiment, a constant-pressure spring 9 is mounted on the lower end of the guide sleeve 7. The upper end of the constant-pressure spring 9 is fixedly connected to the guide sleeve 7, while the lower end extends out of the guide sleeve 7 and abuts against the lower sealing gasket 3. The lower sealing gasket 3 can move up and down within the movable iron core 1. Under the pressure of the constant-pressure spring 9, the lower rubber sealing gasket seals the air supply pressure at the air inlet 4.

[0032] In this embodiment, since the lower sealing gasket 3 is independently arranged in the axial cavity of the moving iron core 1, the lower sealing gasket 3 is only controlled by the air pressure and the constant pressure spring 9, and the electromagnetic force does not participate in its movement, thereby ensuring the response accuracy of the constant pressure threshold (Xbar) and solving the "air grabbing" problem from the structural root.

[0033] The guide sleeve 7 is provided with an annular protrusion 10 on its surface. The upper surface of the protrusion 10 is fixedly connected to the upper sealing spring 8 , and the lower surface of the protrusion 10 is fixedly connected to the constant pressure spring 9 .

[0034] In a possible embodiment, a plurality of radial exhaust slots 11 are provided on the outer surface of the moving iron core 1 , the number of the exhaust slots 11 is greater than two, and the plurality of exhaust slots 11 are evenly distributed.

[0035] In this embodiment, the number of exhaust slots 11 in the movable iron core 1 is increased from two in the prior art to four. While maintaining the same exhaust passage area, each exhaust slot 11 is smaller, meaning the clearance is smaller than before, effectively reducing the problem of uneven wear. This significantly increases the service life of the movable iron core 1.

[0036] The movable iron core 1 structural design effectively increases the durability of the solenoid valve assembly. Its highly integrated functions and high durability make it suitable for all types of commercial vehicles, reducing vehicle costs and extending vehicle life.

[0037] The operating process of the present invention is as follows: When the solenoid valve is energized, the electromagnetic force generated by the coil pulls the movable iron core 1 upward. At this point, the upper seal 5 independently moves upward under the constant force of the upper sealing spring 8, precisely sealing the exhaust hole, while the lower seal 3 remains sealed by the constant pressure spring 9. When the controller energizes the solenoid valve, the electromagnetic force first overcomes the resistance of the conical spring 2. Subsequently, if the pressure at the air inlet 4 exceeds a certain threshold (for example, the operating pressure of the brake system after complete inflation), the thrust generated by this pressure overcomes the resistance of the constant pressure spring 9, causing the lower seal 5 to open. The released high-pressure gas then enters the working chamber, pushing the main piston, thereby inflating the suspension system. During this process, the movement of the upper seal 5 is completely controlled by the spring, isolating it from electromagnetic force fluctuations and preventing impact damage. When power is removed, the movable iron core 1 returns to its original position, the upper seal 5 disengages from the exhaust hole, opening the exhaust channel, and the lower seal 3 reseals the air inlet hole, completing the airbag deflation.

[0038] In summary, the independent movement of the dual seals relative to the moving iron core 1 ensures air supply priority for critical systems while significantly extending the life of the seal structure. Furthermore, the increased number of air vents 11 within the moving iron core 1 and its unique structure effectively enhance the durability of the solenoid valve assembly. This highly integrated design and high durability are suitable for a wide range of commercial vehicles, reducing overall vehicle costs and increasing vehicle life.

[0039] Although the embodiments or examples of the present disclosure have been described with reference to the accompanying drawings, it should be understood that the above-mentioned methods, systems and devices are merely exemplary embodiments or examples, and the scope of the present invention is not limited by these embodiments or examples, but is only limited by the claims after authorization and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. In addition, the steps may be performed in an order different from that described in this disclosure. Further, the various elements in the embodiments or examples may be combined in various ways. It is important that as technology evolves, many of the elements described herein may be replaced by equivalent elements that appear after this disclosure.

Claims

1. An iron core structure for an air suspension solenoid valve, characterized in that: include: A valve body, wherein the lower end of the valve body is provided with an air inlet hole communicating with the inner cavity thereof, the inner cavity is provided with a moving iron core, and the upper end of the inner cavity is provided with a static iron core, and the static iron core is provided with an exhaust hole; An axial chamber is provided inside the moving iron core, and an upper sealing gasket, a guide sleeve and a lower sealing gasket are provided in the axial chamber from top to bottom. The upper end of the guide sleeve is covered with an upper sealing spring, the lower end of the upper sealing spring is fixedly connected to the guide sleeve, and the upper end extends out of the guide sleeve and abuts against the upper sealing gasket. The upper sealing gasket can move up and down to seal the exhaust hole; the lower sealing gasket abuts against the air inlet hole and can move up and down to seal and open the air inlet hole.

2. The iron core structure for an air suspension solenoid valve according to claim 1, characterized in that: The upper sealing gasket is narrow at the top and wide at the bottom. The surface shape of the axial chamber at the corresponding position matches the upper sealing gasket. The upper sealing gasket can move downward relative to the guide sleeve.

3. The iron core structure for an air suspension solenoid valve according to claim 1, characterized in that: A conical spring is installed between the lower end of the moving iron core and the valve body; The lower end extension section of the movable iron core coaxially passes through the conical inner hole of the conical spring, the central axis of the conical spring coincides with the axis of the movable iron core, and the direction of its elastic force is consistent with the axial movement direction of the movable iron core; The lower end of the conical spring is fixed to the lower end of the inner cavity of the valve body, and the upper end thereof abuts against the bottom surface of the moving iron core.

4. The iron core structure for an air suspension solenoid valve according to claim 3, characterized in that: The lower end of the guide sleeve is covered with a constant pressure spring, the upper end of the constant pressure spring is fixedly connected to the guide sleeve, and the lower end extends out of the guide sleeve and abuts against the lower sealing gasket; the lower sealing gasket can move up and down inside the moving iron core.

5. The iron core structure for an air suspension solenoid valve according to claim 4, characterized in that: An annular protrusion is provided on the surface of the guide sleeve, the upper surface of the protrusion is fixedly connected to the upper sealing spring, and the lower surface of the protrusion is fixedly connected to the constant pressure spring.

6. The iron core structure for an air suspension solenoid valve according to claim 1, characterized in that: A plurality of radial exhaust slots are provided on the outer surface of the moving iron core, the number of the exhaust slots is greater than two, and the plurality of exhaust slots are evenly distributed.

7. The iron core structure for an air suspension solenoid valve according to claim 6, characterized in that: There are four exhaust slots.

8. The iron core structure for an air suspension solenoid valve according to claim 1, characterized in that: A bushing is provided on the surface of the inner cavity, and the moving iron core is located in the bushing and is in clearance fit with the bushing.

9. The iron core structure for an air suspension solenoid valve according to claim 1, characterized in that: An annular upper sealing lip is formed at the end of the exhaust hole.

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