Proportional electromagnetic valve with low hysteresis and long service life
By designing the guide ring plate and elastic plate, the problems of large hysteresis, poor stability and short life of proportional solenoid valves are solved, realizing a solenoid valve with low hysteresis and long life, ensuring the consistency and stability of output characteristics.
Patent Information
- Application Number
- CN202423060057.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Existing proportional solenoid valves suffer from problems such as large hysteresis, poor stability, and short lifespan during operation, mainly due to inconsistencies and wear caused by the friction of the armature on the axial sliding drag-reducing ring.
The design eliminates the need for an axial sliding drag-reducing ring. Through the cooperation of the guide ring plate and the elastic plate, the valve core and armature are coaxially installed. The elastic plate supports the valve core, reduces friction, eliminates hysteresis, and extends service life.
This achieves a low-hysteresis operating state, improves the stability and lifespan of the solenoid valve, and ensures the consistency and long-term stability of output characteristics.
Smart Images
Figure CN223594990U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of solenoid valve technology, specifically to a proportional solenoid valve with low hysteresis and long life. Background Technology
[0002] Valves are the core component of fluid control systems, and solenoid valves are widely used in the valve industry due to their ease of control and fast response. The working principle of a solenoid valve is that when not energized, the armature, valve core, and other parts are located at the beginning of their stroke due to the action of a return spring-like structure; after energization, the magnetic field generated by the coil attracts the armature, valve core, and other parts to move, thus changing the conduction state of the fluid passage inside the valve. Ordinary on / off solenoid valves only have two states: fully open and fully closed, and cannot control the valve's output characteristics such as flow rate and pressure. Proportional solenoid valves, compared to traditional solenoid valves, have the advantage of being able to control output characteristics such as flow rate and pressure. Figure 1 The image shown is a cross-sectional view of a proportional solenoid valve from LOWENSTEIN. This proportional solenoid valve has a simple structure; aside from a few parts requiring high machining precision, the overall machining and assembly are simple, and it provides good proportional output performance.
[0003] Under ideal conditions, in existing proportional solenoid valves, the armature (valve core) remains balanced under the influence of the electromagnetic force of the coil, the return spring force, and the clean air pressure during operation. The armature has a hole connecting the upper and lower cavities, ensuring equal air pressure in both cavities. This allows the clean air pressure on the armature to be considered a constant value under certain operating conditions. This constant value is related not only to the difference between the inlet and outlet air pressures but also to the size of the central hole in the lower half of the valve cavity. The return spring force exhibits a linear variation. Within a certain range, the electromagnetic force on the armature is unaffected by the armature's position and depends only on the coil current. The variation patterns of the electromagnetic force, return spring force, and clean air pressure give the proportional solenoid valve good linear operating characteristics.
[0004] Under actual working conditions, the armature, supported only by the return spring, cannot guarantee movement along the same axis. The armature contacts the inner wall of the upper part of the valve cavity through the axial sliding drag-reducing ring, resulting in unavoidable friction. This leads to:
[0005] 1. There is a significant hysteresis between the lift and return strokes of a proportional solenoid valve. During the lift and return strokes, the valve port gradually opens and closes. The armature moves upward from its initial position to its limit position and then downward back to its initial position. The direction of the frictional force between the axial sliding drag-reducing ring and the inner wall of the upper part of the valve cavity is always opposite to the direction of movement. Different force conditions result in different equilibrium positions of the armature under the same coil current. Specifically, the return position is higher, and the output flow rate during the return stroke is greater than that during the lift stroke.
[0006] 2. Poor consistency in the operating state of proportional solenoid valves. During the assembly process, it is impossible to ensure that the armature of the proportional solenoid valve is on the same axis. The degree of skewness of the armature relative to the axis in the manufactured products is inconsistent, resulting in poor consistency in the final working output characteristics.
[0007] 3. Proportional solenoid valves have low stability and short service life. During operation, the armature of a proportional solenoid valve cannot be guaranteed to always move on the same axis. When disturbances such as changes in valve position occur, the degree of armature skew may change, altering the valve's output characteristics. The axial sliding drag-reducing ring will inevitably wear down with increasing valve operating time, leading to changes in the valve's output characteristics and a short overall service life. Utility Model Content
[0008] To address the aforementioned issues, this invention provides a low-hysteresis, long-life proportional solenoid valve that does not require an axial sliding drag-reducing ring.
[0009] To achieve the above objectives, this utility model specifically adopts the following technical solution: a low-hysteresis, long-life proportional solenoid valve, comprising a drive unit, a transmission unit, and an operating unit installed sequentially from top to bottom. The drive unit includes a protective housing, and a drive module is disposed inside the protective housing. The operating unit includes a valve body, and a valve core is disposed in the middle of the valve body. The transmission unit includes a sealing seat, and a guide ring plate extending into the valve body is disposed at the lower part of the sealing seat. An elastic sheet sleeved on the outside of the valve core is disposed inside the guide ring plate.
[0010] As a further improvement to the above technical solution:
[0011] The valve core has a limiting platform one for installing the elastic sheet on its side wall, and the guide ring plate has a limiting platform two for installing the elastic sheet on its inner side wall.
[0012] The first limiting platform is located below the elastic sheet, and the second limiting platform is located above the elastic sheet.
[0013] The drive module includes a bracket housed within a protective housing. A coil is disposed on the outer side of the bracket, and a permanent magnet is disposed on the inner side. An extension sleeve extending between the bracket and the permanent magnet is disposed on the upper part of the sealing seat.
[0014] An armature located below the permanent magnet is provided inside the extension sleeve. A magnetic isolation pad is provided between the upper part of the armature and the permanent magnet. A reset spring connected to the permanent magnet is provided inside the armature.
[0015] The upper part of the armature is provided with an alignment post, and the lower part is provided with a snap-fit sleeve that connects to the valve core.
[0016] The lower part of the permanent magnet is provided with a guide chamber for use with the alignment post. The alignment post is frustoconical in shape and its diameter gradually decreases from bottom to top.
[0017] The beneficial effects of this utility model embodiment are as follows: The low-hysteresis, long-life proportional solenoid valve includes a drive unit, a transmission unit, and a working unit installed sequentially from top to bottom. The drive unit includes a protective housing, and a drive module is installed inside the protective housing. The working unit includes a valve body, with a cavity in the middle of the valve body. A valve core is installed inside the cavity. An oil inlet and an oil outlet are provided at the bottom of the valve body. A sealing gasket that fits against the oil inlet is provided at the lower part of the valve core. The transmission unit includes a sealing seat installed between the valve body and the protective housing. A guide ring plate extending into the valve body is provided at the lower part of the sealing seat. An elastic sheet fitted outside the valve core is provided inside the guide ring plate. The cooperation between the guide ring plate and the valve body can... By ensuring the sealing seat and valve body are coaxially distributed, and through the design of the elastic plate, the valve core is installed and fixed, so that the valve core is in a suspended state while ensuring coaxial installation with the armature. Compared with the existing method that requires an axial sliding drag-reducing ring to be installed between the valve core and the valve body, this method can ensure the coaxial installation of the valve core and the armature. At the same time, the elastic plate supports the valve core, so that it is in a suspended state after installation, reducing friction with the valve body sidewall during axial movement. This avoids changes in the force state during the lift and return strokes, eliminates the lag caused by friction, and does not reduce the service life of the entire solenoid valve after wear, unlike the axial sliding drag-reducing ring. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the patent involved in the background art;
[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model;
[0020] Figure 3 This is a schematic diagram of the sealing seat in this utility model;
[0021] Figure 4 This is a cross-sectional view of the sealing seat in this utility model;
[0022] Figure 5 This is a schematic diagram of the connection structure between the armature and the valve core in this utility model;
[0023] Figure 6 This is a cross-sectional view of the armature and valve core in this utility model.
[0024] In the diagram: 1. Protective housing; 2. Valve body; 3. Valve core; 4. Sealing seat; 5. Guide ring plate; 6. Elastic sheet; 7. Limiting platform one; 8. Limiting platform two; 9. Bracket; 10. Coil; 11. Permanent magnet; 12. Extension sleeve; 13. Armature; 14. Magnetic shielding gasket; 15. Alignment post; 16. Snap-fit sleeve; 17. Guide chamber; 18. Return spring. Detailed Implementation
[0025] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.
[0026] like Figure 2-6 As shown, the low-hysteresis, long-life proportional solenoid valve of this embodiment includes a drive unit, a transmission unit, and a working unit installed sequentially from top to bottom. The drive unit includes a protective housing 1, in which a drive module is installed. The working unit includes a valve body 2, with a cavity in the middle of the valve body 2. A valve core 3 is installed in the cavity. The bottom of the valve body 2 has an oil inlet and an oil outlet. The lower part of the valve core 3 has a sealing gasket that fits against the oil inlet. The transmission unit includes a sealing seat 4 installed between the valve body 2 and the protective housing 1. The lower part of the sealing seat 4 has a guide ring plate 5 extending into the valve body 2. The guide ring plate 5 has an elastic sheet 6 sleeved on the outside of the valve core 3. The cooperation between the guide ring plate 5 and the valve body 2 can ensure a tight seal. The sealing seat 4 is coaxially distributed with the valve body 2. Through the design of the elastic plate 6, the valve core 3 is installed and fixed, so that the valve core 3 is in a suspended state while ensuring coaxial installation with the armature 13. Compared with the existing method that requires the installation of an axial sliding drag-reducing ring between the valve core 3 and the valve body 2, this method can ensure the coaxial installation of the valve core 3 and the armature 13. At the same time, the elastic plate 6 supports the valve core 3, so that it is in a suspended state after installation, reducing friction with the side wall of the valve body 2 during axial movement. This avoids changes in the force state during the lift and return strokes, eliminates the lag caused by friction, and does not reduce the service life of the entire solenoid valve after wear, unlike the axial sliding drag-reducing ring.
[0027] The valve core 3 has a limiting platform 7 on its side wall for mounting the elastic plate 6, and the guide ring plate 5 has a limiting platform 8 on its inner side wall for mounting the elastic plate 6. The limiting platform 7 is located below the elastic plate 6, and the limiting platform 8 is located above the elastic plate 6. The limiting platform 7 and the limiting platform 8 limit the elastic plate 6 at the upper and lower parts respectively, thereby limiting the longitudinal displacement distance of the valve core 3. At the same time, the valve core 3 is reset in conjunction with the reset spring 18 during reset.
[0028] The drive module includes a bracket 9 located inside the protective housing 1. A coil 10 is installed on the outside of the bracket 9, and a permanent magnet 11 is provided on the inside. An extension sleeve 12 extending between the bracket 9 and the permanent magnet 11 is provided on the upper part of the sealing seat 4. The permanent magnet 11 passes through the upper part of the extension sleeve 12. A sealing cover is provided on the upper part of the protective housing 1. The permanent magnet 11 and the sealing cover are connected by screws. The extension sleeve 12 is located between the bracket 9 and the permanent magnet 11 and cooperates with the lower guide ring plate 5. This ensures the coaxiality of the valve body 2, the protective housing 1, and the sealing seat 4 after assembly, thereby ensuring the coaxiality of the permanent magnet 11, the armature 13, and the valve core 3. This prevents the solenoid valve from being misaligned during assembly, which would affect the stability of subsequent operations.
[0029] The extension sleeve 12 is provided with an armature 13 located below the permanent magnet 11. A magnetic isolation pad 14 is provided between the upper part of the armature 13 and the permanent magnet 11. A return spring 18 connected to the permanent magnet 11 is provided inside the armature 13. A storage chamber coaxially distributed with the valve core 3 is provided on the upper part of the armature 13. The return spring 18 is located in the storage chamber and its upper part is connected to the permanent magnet 11. Positioning posts for fixing the return spring 18 are provided on both the storage chamber and the permanent magnet 11.
[0030] The upper part of the armature 13 is provided with an alignment post 15, and the lower part is provided with a snap-fit sleeve 16 connected to the valve core 3. The alignment post 15 and the snap-fit sleeve 16 are coaxially distributed. The lower part of the permanent magnet 11 is provided with a guide chamber 17 that cooperates with the alignment post 15. The alignment post 15 is frustoconical and its diameter gradually decreases from bottom to top. The side wall of the alignment post 15 is sloping, which can avoid friction between it and the permanent magnet 11 during axial movement, thus avoiding affecting the stability of the valve core 3 displacement.
[0031] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.
[0034] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.
Claims
1. A low-hysteresis, long-life proportional solenoid valve, comprising a drive unit, a transmission unit, and a working unit installed sequentially from top to bottom, characterized in that: The drive unit includes a protective housing (1), and a drive module is provided inside the protective housing (1). The working unit includes a valve body (2), and a valve core (3) is provided in the middle of the valve body (2). The transmission unit includes a sealing seat (4), and a guide ring plate (5) extending into the valve body (2) is provided at the lower part of the sealing seat (4). An elastic sheet (6) sleeved on the outside of the valve core (3) is provided inside the guide ring plate (5).
2. The low-hysteresis, long-life proportional solenoid valve according to claim 1, characterized in that: The valve core (3) has a limiting platform (7) for installing the elastic plate (6) on its side wall, and the guide ring plate (5) has a limiting platform (8) for installing the elastic plate (6) on its inner side wall.
3. The low-hysteresis, long-life proportional solenoid valve according to claim 2, characterized in that: The first limiting platform (7) is located below the elastic sheet (6), and the second limiting platform (8) is located above the elastic sheet (6).
4. The low-hysteresis, long-life proportional solenoid valve according to claim 1, characterized in that: The drive module includes a bracket (9) housed in a protective housing (1), a coil (10) on the outside of the bracket (9) and a permanent magnet (11) on the inside, and an extension sleeve (12) extending between the bracket (9) and the permanent magnet (11) on the upper part of the sealing seat (4).
5. The low-hysteresis, long-life proportional solenoid valve according to claim 4, characterized in that: An armature (13) is provided inside the extension sleeve (12) and located below the permanent magnet (11). A magnetic isolation pad (14) is provided between the upper part of the armature (13) and the permanent magnet (11). A reset spring (18) connected to the permanent magnet (11) is provided inside the armature (13).
6. The low-hysteresis, long-life proportional solenoid valve according to claim 5, characterized in that: The armature (13) is provided with an alignment post (15) on the upper part and a snap sleeve (16) connected to the valve core (3) on the lower part.
7. The low-hysteresis, long-life proportional solenoid valve according to claim 6, characterized in that: The lower part of the permanent magnet (11) is provided with a guide chamber (17) for use with the alignment post (15). The alignment post (15) is frustoconical and its diameter gradually decreases from bottom to top.