Improved structure of movable iron core and proportional cartridge valve

Abstract

The utility model belongs to the technical field of proportional valve structures, and discloses a movable iron core improved structure and a proportional cartridge valve. Wherein the surface of the movable iron core is coated with a Teflon coating, a spiral groove is formed in the outer circle face of the movable iron core, the spiral groove is used for enabling the movable iron core to generate rotating force under the action of oil liquid, then the movable iron core is made to do axial translation and rotate at the same time, and the spiral groove is further used for collecting and guiding pollutants in the oil liquid. According to the improved structure of the movable iron core, the surface of the movable iron core is provided with the Teflon coating, the abrasion resistance of the movable iron core is improved, the movable iron core rotates and axially moves at the same time through the spiral groove formed in the surface of the movable iron core, the friction force of movement of the movable iron core is reduced, pollutants in oil liquid can be brought into the spiral groove in the rotating process, and the pollution to the environment is reduced. Therefore, the service life of the movable iron core is prolonged, the anti-pollution capacity of the iron core cavity is improved, and the service life of the proportional cartridge valve adopting the movable iron core is prolonged, and the proportional performance of the proportional cartridge valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of proportional valve structures, and particularly relates to an improved structure of a moving iron core and a proportional cartridge valve. Background Art

[0002] In a common proportional valve structure, the spool and the moving iron core are the two parts that move reciprocally most frequently. Since the spool undergoes heat treatment, its surface has high hardness and wear resistance, so its service life is very long. However, since the moving iron core is made of soft magnetic material and its hardness cannot be improved through heat treatment, it is often the first part in the proportional valve to start wearing. After the moving iron core wears, the electromagnetic force will change, affecting the performance of the proportional valve. The particles and other pollutants generated by the worn and fallen materials will cause the movement of the moving iron core to be blocked, further affecting the use of the proportional valve. Summary of the Utility Model

[0003] Based on the above problems, the purpose of the utility model is to provide an improved structure of a moving iron core and a proportional cartridge valve, reduce the wear of the moving iron core, improve the sticking, failure and other situations caused by pollutants, and ensure the normal use of the proportional cartridge valve.

[0004] To achieve the above object, on the one hand, the utility model adopts the following technical scheme:

[0005] An improved structure of a moving iron core, wherein a Teflon coating is applied to the surface of the moving iron core, and a spiral groove is formed on the outer circumferential surface of the moving iron core. The spiral groove is used to generate a rotational force on the moving iron core under the action of oil, so that the moving iron core makes an axial translation and rotation at the same time. The spiral groove is also used to collect and divert the pollutants in the oil.

[0006] As an optional scheme, there is more than one spiral groove, and each spiral groove is evenly distributed around the axis of the moving iron core in a circumferential direction.

[0007] As an optional scheme, the spiral angle of the spiral groove is 45° - 65°.

[0008] As an optional scheme, the cross-section of the spiral groove is in a bow shape.

[0009] On the other hand, the utility model adopts the following technical scheme:

[0010] A proportional cartridge valve, which includes a housing. A core cavity is arranged inside the housing, a coil is wound around the outer wall of the core cavity, a stationary iron core and a moving iron core with the above-mentioned improved structure of the moving iron core are arranged inside the core cavity, and the moving iron core is driven by the magnetic force generated by the coil to move towards the stationary iron core.

[0011] As an alternative, a valve sleeve is provided at one end of the static iron core away from the moving iron core. A valve core is arranged inside the valve sleeve. The valve core moves towards the static iron core under the elastic force of a return spring. A push rod passes through the static iron core. One end of the push rod abuts against the valve core. The moving iron core is sleeved on the other end of the push rod, and a protrusion for limiting the moving iron core is arranged on the push rod.

[0012] As an alternative, the moving iron core and the push rod are in clearance fit, so that the moving iron core can slide and rotate relative to the push rod.

[0013] The beneficial effects of the present utility model: The improved structure of the moving iron core improves the wear resistance of the moving iron core by providing a Teflon coating on the surface of the moving iron core. And through the spiral groove opened on the surface of the moving iron core, the original axial translation movement of the moving iron core is changed to an axial movement while rotating, reducing the friction force of the moving iron core movement. And when rotating, the pollutants in the oil fluid will be brought into the spiral groove, reducing problems such as jamming caused by pollutants. Thereby, the service life of the moving iron core and the anti-pollution ability of the iron core cavity are improved. The proportional cartridge valve using this moving iron core can effectively alleviate the hysteresis loop problem, improving the service life and proportional performance of the proportional cartridge valve. Description of the Drawings

[0014] Figure 1 is the front view of the improved structure of the moving iron core provided by the embodiment of the present utility model;

[0015] Figure 2 is the end view of the improved structure of the moving iron core provided by the embodiment of the present utility model;

[0016] Figure 3 is the structural schematic diagram of the proportional cartridge valve provided by the embodiment of the present utility model.

[0017] In the drawings:

[0018] 1. Moving iron core; 11. Teflon coating; 12. Spiral groove; 2. Outer shell; 3. Iron core cavity; 4. Coil; 5. Static iron core; 6. Valve sleeve; 7. Valve core; 8. Return spring; 9. Push rod; 91. Protrusion. Detailed Embodiments

[0019] The present utility model will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0020] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0022] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0023] Please refer to Figure 1 and Figure 2 As shown, this preferred embodiment provides an improved structure of a moving iron core. In particular, the surface of the moving iron core 1 is coated with a Teflon coating 11, and a spiral groove 12 is formed on the outer circumferential surface of the moving iron core 1. The spiral groove 12 is used to generate a rotational force on the moving iron core 1 under the action of oil, so that the moving iron core 1 makes an axial translation while rotating. The spiral groove 12 is also used to collect and divert the contaminants in the oil.

[0024] Among them, Teflon is a very wear-resistant material. After spraying Teflon on the surface of the moving iron core 1, the service life of the moving iron core 1 can be greatly improved.

[0025] Thus, by spraying a Teflon coating 11 on the surface of the moving iron core 1, the wear resistance of the moving iron core 1 is improved. And through the spiral groove 12 opened on the surface of the moving iron core 1, the original axial translation movement of the moving iron core 1 is changed to an axial movement while rotating, reducing the frictional force of the movement of the moving iron core 1. Moreover, during the rotational movement, the contaminants in the oil fluid will be brought into the spiral groove 12, reducing problems such as jamming caused by the contaminants, thereby improving the service life of the moving iron core 1 and the anti-pollution ability of the iron core cavity 3.

[0026] Optionally, there is more than one spiral groove 12, and each spiral groove 12 is evenly distributed around the axis of the moving iron core 1 in a circular pattern. In this embodiment, two spiral grooves 12 are taken as an example.

[0027] Particularly, the helix angle of the spiral groove 12 is 45° - 65°. In this angle range, the moving iron core 1 can generate an appropriate amount of rotation during the axial movement. In fact, it does not need to generate too large an amount of rotation.

[0028] Particularly, the cross-section of the spiral groove 12 is bow-shaped, and the smooth groove shape can reduce the kinetic energy loss.

[0029] On this basis, this embodiment also provides a proportional cartridge valve, as Figure 3 shown, which includes a housing 2. Inside the housing 2, there is an iron core cavity 3. A coil 4 is wound around the outer wall of the iron core cavity 3. Inside the iron core cavity 3, there is a static iron core 5 and a moving iron core 1 with the improved structure of the moving iron core described above. The moving iron core 1 is driven by the magnetic force generated by the coil 4 to move towards the static iron core 5.

[0030] Specifically, at one end of the static iron core 5 away from the moving iron core 1, there is a valve sleeve 6. Inside the valve sleeve 6, there is a valve core 7. The valve core 7 is moved towards the static iron core 5 under the elastic force of a return spring 8. A push rod 9 passes through the static iron core 5. One end of the push rod 9 abuts against the valve core 7. The moving iron core 1 is sleeved on the other end of the push rod 9, and a protrusion 91 for limiting the moving iron core 1 is provided on the push rod 9.

[0031] Furthermore, the moving iron core 1 and the push rod 9 are in clearance fit, enabling the moving iron core 1 to slide and rotate relative to the push rod 9.

[0032] Thus, on the one hand, the sprayed Teflon coating 11 can greatly improve the service life of the moving iron core 1. On the other hand, when the proportional cartridge valve is working, the oil fluid passing through the spiral groove 12 will provide a rotational force to the moving iron core 1, changing the original reciprocating up and down movement of the moving iron core 1 to a movement of rotating while moving up and down. In this way, the frictional force of the movement of the moving iron core 1 can be reduced, the frictional force hysteresis loop can be reduced, making the proportional performance of the proportional cartridge valve better. And during the rotational movement, the contaminants in the oil fluid will be brought into the spiral groove 12, reducing problems such as jamming caused by the contaminants, improving the anti-pollution ability of the proportional cartridge valve, and also improving the service life of the proportional cartridge valve from this aspect.

[0033] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Improved structure of the moving iron core, characterized in that, The surface of the moving iron core (1) is coated with a Teflon coating (11), and a spiral groove (12) is formed on the outer circumferential surface of the moving iron core (1). The spiral groove (12) is used to generate a rotational force on the moving iron core (1) under the action of oil, so that the moving iron core (1) makes an axial translation while rotating. The spiral groove (12) is also used to collect and divert contaminants in the oil.

2. The improved structure of the moving iron core according to claim 1, characterized in that, More than one spiral groove (12) is provided, and each spiral groove (12) is evenly distributed around the axis of the moving iron core (1) in a circumferential manner.

3. The improved structure of the moving iron core according to claim 1, characterized in that, The helix angle of the spiral groove (12) is 45° - 65°.

4. The improved structure of the moving iron core according to claim 1, characterized in that, The cross-section of the spiral groove (12) is bow-shaped.

5. Proportional cartridge valve, characterized in that, It includes a housing (2). A core cavity (3) is arranged inside the housing (2). A coil (4) is wound around the outer wall of the core cavity (3). A stationary iron core (5) and a moving iron core (1) with the improved structure of the moving iron core described in any one of claims 1 to 4 are arranged inside the core cavity (3). The moving iron core (1) is driven by the magnetic force generated by the coil (4) to move towards the stationary iron core (5).

6. The proportional cartridge valve according to claim 5, characterized in that, A valve sleeve (6) is arranged at one end of the stationary iron core (5) away from the moving iron core (1). A valve core (7) is arranged inside the valve sleeve (6). The valve core (7) is moved towards the stationary iron core (5) under the elastic force of a return spring (8). A push rod (9) passes through the stationary iron core (5). One end of the push rod (9) abuts against the valve core (7). The moving iron core (1) is sleeved on the other end of the push rod (9), and a protrusion (91) for limiting the moving iron core (1) is arranged on the push rod (9).

7. The proportional cartridge valve according to claim 6, characterized in that, The moving iron core (1) is in clearance fit with the push rod (9), so that the moving iron core (1) can slide and rotate relative to the push rod (9).

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