Normally open solenoid valve for double-cavity air spring

Abstract

The utility model relates to a normally open solenoid valve for a double-cavity air spring, which comprises a shell, a movable iron core axially moving and a coil assembly controlling the movable iron core to move are arranged in the shell, a base is mounted at one end of the shell, a base is mounted between the base and the coil assembly, and a valve port is arranged on the base. A tappet capable of moving axially is arranged at the position, corresponding to the valve port, between the base and the base, one end of the tappet penetrates through the base to abut against the movable iron core, an elastic piece is arranged at the second end of the tappet, and an auxiliary sealing piece is arranged between the tappet and the base and comprises a sealing body which is in a circular ring shape. The upper end and the lower end of the sealing body are each provided with an outer lip part and an inner lip part, the two outer lip parts, the two inner lip parts and the whole vertical section of the sealing body are in an X shape, the two inner lip parts are in interference fit with the outer wall of a tappet, and the two outer lip parts are in interference fit with a base. A brand new auxiliary sealing piece structure is designed, and the difference value of dynamic and static friction force can be reduced as much as possible through the design.

Description

Technical Field

[0001] This utility model relates to the field of automotive air spring technology, and in particular to a normally open solenoid valve for a dual-chamber air spring. Background Technology

[0002] Under a specific air pressure condition, a single-chamber air spring exhibits only a single characteristic curve for its stiffness. However, by using a solenoid valve to connect and disconnect an additional air reservoir outside the main reservoir, the volume of the reservoir can vary under a given air pressure. When the solenoid valve opens, the total volume of the reservoir increases, leading to a decrease in pressure and a softening of the vehicle's suspension. Conversely, if the solenoid valve remains closed, the suspension can remain relatively stiff. Therefore, by adding a solenoid valve, the air spring exhibits a multi-stiffness characteristic curve.

[0003] Currently, spring-loaded solenoid valves present a challenge in coordinating sealing pressure and NVH (Noise, Vibration, and Harshness). Due to the relatively high internal sealing pressure (≈15 bar), conventional solenoid valves employing O-ring seals result in significant sealing friction. To counteract this friction, a larger electromagnetic force is required. Therefore, optimizing the existing solenoid valve sealing structure is necessary to address these issues. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a normally open solenoid valve for a double-cavity air spring. A brand-new auxiliary sealing component structure is designed. The auxiliary sealing component consists of an outer lip, an inner lip, and a sealing body. The overall vertical cross section is X-shaped. The two inner lips are interference-fitted with the outer wall of the push rod, and the two outer lips are interference-fitted with the base. This design can minimize the difference between dynamic and static friction.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a normally open solenoid valve for a double-cavity air spring is provided, including a housing. The housing has an axially movable moving iron core and a coil assembly for controlling the movement of the moving iron core inside. A base is installed at one end of the housing. A base is installed between the base and the coil assembly. A valve port is opened on the base. A push rod that can move axially is provided between the base and the base at the position corresponding to the valve port. One end of the push rod passes through the base and abuts against the moving iron core. An elastic element is provided at the second end of the push rod. An auxiliary sealing element is provided between the push rod and the base. The auxiliary sealing element includes a sealing body. The sealing body is annular. Both the upper and lower ends of the sealing body are provided with outer lips and inner lips. The vertical cross section of the two outer lips, the two inner lips, and the sealing body as a whole is X-shaped. The two inner lips are interference-fitted with the outer wall of the push rod, and the two outer lips are interference-fitted with the base.

[0006] As a supplement to the technical solution described in this utility model, the coil assembly includes enameled wire and a frame. The frame is installed inside the housing, and enameled wire is wound around the outside of the frame. A magnetic shielding tube is installed in the inner hole of the frame, and the moving iron core is axially movable inside the magnetic shielding tube.

[0007] As a supplement to the technical solution described in this utility model, a connector connected to the frame is installed at one axial end of the outer shell, and the connector has a terminal connected to the enameled wire inside.

[0008] As a supplement to the technical solution described in this utility model, a vibration damping pad for reducing noise is provided between the inside of the magnetic shielding tube and the end of the moving iron core. The vibration damping pad slows down the moving iron core, which can effectively reduce noise.

[0009] As a supplement to the technical solution described in this utility model, a sliding bearing is provided between the base and the push rod to ensure smooth sliding between the base and the push rod.

[0010] As a supplement to the technical solution described in this utility model, an annular groove is provided between the base and the push rod, and the outer side of the annular groove is sealed by a baffle. The sliding bearing and the auxiliary seal are respectively arranged in the annular groove from the inside to the outside.

[0011] As a supplement to the technical solution described in this utility model, the inner sidewall of the base located above the valve port is provided with a tapered sidewall, and the second end of the push rod is provided with a rectangular sealing ring for forming a seal with the tapered sidewall. The vertical cross-section of the rectangular sealing ring is rectangular. A good sealing effect can be achieved through the tapered sidewall and the rectangular sealing ring. During the movement of the push rod, the rectangular sealing ring will be squeezed to improve the sealing effect.

[0012] As a supplement to the technical solution described in this utility model, an inwardly concave arc surface is provided between adjacent outer and inner lips. The concave arc surface achieves a smooth transition between the outer and inner lips, while improving the structural strength and stability between them.

[0013] Beneficial Effects: This utility model relates to a normally open solenoid valve with a double-chamber air spring. It features a novel auxiliary sealing structure, consisting of an outer lip, an inner lip, and a sealing body. The overall vertical cross-section is X-shaped. The two inner lips are interference-fitted with the outer wall of the push rod, and the two outer lips are interference-fitted with the base. This design minimizes the difference between dynamic and static friction. During the solenoid valve's closing process, the electromagnetic force increases exponentially with the decrease in electromagnetic gap. The application of the auxiliary sealing component effectively reduces friction during the solenoid valve's closing stroke, optimizing the overall force during the closing process and reducing vibration and noise. An inwardly concave arc surface is provided between adjacent outer and inner lips, achieving a smooth transition between them while simultaneously improving the structural strength and stability of both. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the utility model in its open state;

[0015] Figure 2 This is a cross-sectional view of the present invention in its closed state;

[0016] Figure 3 This is a schematic diagram of the structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the auxiliary sealing element described in this utility model;

[0018] Figure 5 This is a cross-sectional view of the auxiliary sealing element described in this utility model.

[0019] Diagram: 1. Push rod, 2. Auxiliary seal, 3. Rectangular sealing ring, 4. Moving iron core, 5. Base, 6. Base, 7. Enamelled wire, 8. Sliding bearing, 9. Elastic element, 10. Shock-absorbing pad, 11. Housing, 12. Terminal, 13. Connector, 14. Frame, 15. Magnetic shielding tube, 16. Valve port, 17. Baffle, 18. Conical sidewall, 19. Sealing body, 20. Outer lip, 21. Inner lip, 22. Arc surface, 23. Side opening. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0021] The embodiments of this utility model relate to a normally open solenoid valve for a double-chamber air spring, such as... Figure 1-5As shown, the device includes a housing 11. Inside the housing 11, there is an axially movable moving iron core 4 and a coil assembly for controlling the movement of the moving iron core 4. A base 6 is mounted on one end of the housing 11, and a base 5 is mounted between the base 6 and the coil assembly. A valve port 16 is provided on the base 6. A axially movable push rod 1 is provided between the base 6 and the base 5 at the position corresponding to the valve port 16. One end of the push rod 1 passes through the base 5 and abuts against the moving iron core 4. An elastic element 9, which is a spring, is provided at the second end of the push rod 1. An auxiliary sealing element 2 is provided between the push rod 1 and the base 5. The auxiliary sealing element 2 includes a sealing body 19. The sealing body 19 is annular in shape. Both the upper and lower ends of the sealing body 19 are provided with outer lips 20 and inner lips 21. The vertical cross-section of the two outer lips 20, the two inner lips 21 and the sealing body 19 as a whole is X-shaped. The two inner lips 21 are interference-fitted with the outer wall of the push rod 1, and the two outer lips 20 are interference-fitted with the base 5. The X-shaped auxiliary sealing element 2 is designed to minimize the difference between dynamic and static friction. At the same time, it can reduce the spring force and minimize the electromagnetic force. Therefore, through the lip sealing design of the auxiliary sealing element 2, the friction force on the entire mover is minimized, and the overall force is minimized, thereby optimizing the overall NVH characteristics of the solenoid valve.

[0022] In this embodiment, in order to improve the sealing performance of the valve port 16 during opening and closing, a tapered sidewall 18 is provided on the inner sidewall of the base 6 located above the valve port 16. The second end of the push rod 1 is provided with a rectangular sealing ring 3 for forming a seal with the tapered sidewall 18. The vertical cross-section of the rectangular sealing ring 3 is rectangular. A good sealing effect can be achieved through the tapered sidewall 18 and the rectangular sealing ring 3. During the movement of the push rod 1, the rectangular sealing ring 3 will be squeezed to improve the sealing effect.

[0023] The push rod 1, the moving iron core 4, and the coil assembly that controls the movement of the moving iron core 4 constitute the moving part structure of the solenoid valve.

[0024] This utility model involves a sealing structure with two internal seals. One seal is the main seal, sealing the valve port 16 at the bottom of the solenoid valve and the side port 23 on the side. This seal uses a rectangular sealing ring 3. A rectangular sealing ring 3 is set at the second end of the push rod 1. The rectangular sealing ring 3 contacts and is pressed against the conical sidewall 18 to form a seal. The other seal is an auxiliary seal, located in the area of ​​the solenoid valve's moving part. After the solenoid valve is closed, it has the same pressure difference as the main seal. To meet the sealing requirements, the auxiliary sealing element 2 in this sealing area needs to have a certain interference fit with the push rod 1 of the moving part. Because the sealing pressure is relatively high (≈15 bar), the conventional O-ring design will result in a large sealing friction. To counteract this friction, a large electromagnetic force is required. As is well known, static friction is much greater than dynamic friction. After overcoming the static friction, the electromagnetic force plays a major role, resulting in a large overall force, which in turn causes the moving part to accelerate more and the solenoid valve to vibrate to an unacceptable degree.

[0025] To reduce the overall force, the moving element needs to maintain a small difference between dynamic and static friction. Therefore, the design aims to reduce this difference while minimizing friction, thereby reducing the electromagnetic force. This reduction in the combined force of electromagnetic force, spring force, and friction optimizes the NVH performance of the solenoid valve. Therefore, the auxiliary sealing element 2 in this invention is a bidirectional lip-cup structure. This structure achieves bidirectional sealing with the same sealing pressure, and the friction can be minimized through a small interference fit between the inner and outer diameters and the sealing ring lip.

[0026] As a preferred embodiment of the auxiliary seal 2, an inwardly recessed arc surface 22 is provided between adjacent outer lips 20 and inner lips 21. The recessed arc surface 22 enables a smooth transition between the outer lips 20 and inner lips 21, while improving the structural strength and stability between the two.

[0027] In this embodiment, the coil assembly includes enameled wire 7 and a bobbin 14. The bobbin 14 is installed inside the outer shell 11. The bobbin 5 is preferably made of high-strength nylon. The enameled wire 7 is wound around the outside of the bobbin 14. A magnetic shielding tube 15 is installed in the inner hole of the bobbin 14. The moving iron core 4 is axially movably disposed inside the magnetic shielding tube 15. A connector 13 connected to the bobbin 14 is installed at one axial end of the outer shell 11. The connector 13 has a terminal 12 connected to the enameled wire 7 inside.

[0028] In this embodiment, a noise-reducing damping pad 10 is provided between the inside of the magnetic shielding tube 15 and the end of the moving iron core 4. The damping pad 10 is fixed to the top of the magnetic shielding tube 15. The fixing method between the two can be embedded installation, snap-fit, etc. The damping pad 10 can slow down the moving iron core 4 and effectively reduce noise.

[0029] In this embodiment, in order to ensure smooth sliding between the base 5 and the push rod 1, a sliding bearing 8 is provided between the base 5 and the push rod 1 to assist sliding; an annular groove is provided between the base 5 and the push rod 1, and the outer side of the annular groove is sealed by a baffle 17. The outer side of the annular groove and the baffle 17 can be fixed by welding. The sliding bearing 8 and the auxiliary sealing element 2 are respectively arranged in the annular groove from the inside to the outside.

[0030] Working principle: When the solenoid valve is energized, the moving iron core 4 is subjected to electromagnetic force, overcoming the resistance of the elastic element 9, and pushing the push rod 1 downward until the rectangular sealing ring 3 presses against the valve port 16 of the base 6. At this time, the solenoid valve is closed, and the valve port 16 at the bottom of the base 6 is not connected to the side port 28 on the side of the base 6. When the solenoid valve is de-energized, the electromagnetic force on the moving iron core 4 disappears, and the elastic element 9 pushes the push rod 1 and the moving iron core 4 upward until the shock-absorbing pad 10 touches the top of the magnetic shielding tube 15. At this time, the rectangular sealing ring 3 separates from the valve port 16 of the base 6, the solenoid valve opens, and the valve port 16 at the bottom of the base 6 is connected to the side port 28 on the side of the base 6.

[0031] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0034] The above provides a detailed description of a normally open solenoid valve for a double-chamber air spring provided in this application. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A normally open solenoid valve for a double-chamber air spring, comprising a housing (11), characterized in that: The housing (11) contains an axially movable iron core (4) and a coil assembly for controlling the movement of the iron core (4). A base (6) is mounted on one end of the housing (11), and a base (5) is mounted between the base (6) and the coil assembly. A valve port (16) is provided on the base (6). A axially movable push rod (1) is provided between the base (6) and the base (5) at the position corresponding to the valve port (16). The first end of the push rod (1) passes through the base (5) and abuts against the iron core (4). The second end of the push rod (1) is provided with a spring. The auxiliary sealing element (2) is provided between the push rod (1) and the base (5). The auxiliary sealing element (2) includes a sealing body (19), which is annular. The upper and lower ends of the sealing body (19) are provided with an outer lip (20) and an inner lip (21). The vertical cross section of the two outer lips (20), the two inner lips (21) and the sealing body (19) as a whole is X-shaped. The two inner lips (21) are interference-fitted with the outer wall of the push rod (1), and the two outer lips (20) are interference-fitted with the base (5).

2. The normally open solenoid valve for a double-chamber air spring according to claim 1, characterized in that: The coil assembly includes enameled wire (7) and a bobbin (14). The bobbin (14) is installed inside the outer shell (11). The enameled wire (7) is wound around the outside of the bobbin (14). A magnetic shielding tube (15) is installed in the inner hole of the bobbin (14). The moving iron core (4) is axially movable inside the magnetic shielding tube (15).

3. The normally open solenoid valve for a double-chamber air spring according to claim 2, characterized in that: The outer casing (11) is equipped with a connector (13) connected to the frame (14) at one end of its axial direction. The connector (13) has a terminal (12) connected to the enameled wire (7) inside.

4. A normally open solenoid valve for a double-chamber air spring according to claim 2, characterized in that: A noise-reducing damping pad (10) is provided between the inside of the magnetic shielding tube (15) and the end of the moving iron core (4).

5. A normally open solenoid valve for a double-chamber air spring according to claim 1, characterized in that: A sliding bearing (8) is provided between the base (5) and the push rod (1).

6. A normally open solenoid valve for a double-chamber air spring according to claim 5, characterized in that: An annular groove is provided between the base (5) and the push rod (1), and the outer side of the annular groove is sealed by a baffle (17). The sliding bearing (8) and the auxiliary seal (2) are arranged sequentially from the inside to the outside inside the annular groove.

7. A normally open solenoid valve for a double-chamber air spring according to claim 1, characterized in that: The inner wall of the base (6) located above the valve port (16) is provided with a tapered sidewall (18), and the second end of the push rod (1) is provided with a rectangular sealing ring (3) for forming a seal with the tapered sidewall (18). The vertical cross section of the rectangular sealing ring (3) is rectangular.

8. A normally open solenoid valve for a double-chamber air spring according to claim 1, characterized in that: An inwardly recessed arc surface (22) is provided between adjacent outer lip (20) and inner lip (21).

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