A proportional directional valve

Abstract

The utility model provides a proportional reversing valve, including valve shell, be provided with valve cavity in valve shell, be provided with the valve core of axial movement in valve cavity, and the valve core includes the axle rod, is provided with the shoulder at the interval on the axle rod, and the edge of both sides of shoulder all is provided with detachable sealing elastic ring, and the side away from the shoulder of sealing elastic ring is provided with annular V type groove, the outside of sealing elastic ring is inclined plane, and the end away from the shoulder of this inclined plane with valve cavity between is provided with cooperation clearance, the utility model reduces the probability that the particulate pollutant enters the clearance between shoulder and valve cavity, guarantees the flexibility of valve core movement simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of directional valve technology, and in particular to a proportional directional valve. Background Technology

[0002] Proportional directional valves use a proportional electromagnet to move the valve core axially, thereby regulating the direction and flow rate of the oil circuit. A micrometer-level gap is typically maintained between the valve core and the valve chamber to ensure flexible valve core movement. However, even after filtration, residual solid particulate contaminants can remain in the oil. These contaminants can easily enter the gap between the valve core shoulder and the valve chamber, causing obstruction or jamming of the valve core. Preventing particulate contaminants from entering the gap without affecting the flexibility of the valve core movement is a key technical problem that needs to be solved. Utility Model Content

[0003] This invention proposes a proportional directional valve that reduces the probability of particulate contaminants entering the gap between the shoulder and the valve chamber, while ensuring the flexibility of the valve core movement.

[0004] The technical solution of this utility model is implemented as follows: A proportional directional valve includes a valve body, a valve cavity is provided inside the valve body, a valve core that moves axially is provided inside the valve cavity, the valve core includes a shaft, shoulders are provided at intervals on the shaft, and detachable sealing elastic rings are provided on both sides of the shoulder. An annular V-groove is provided on the side of the sealing elastic ring away from the shoulder; the outer side of the sealing elastic ring is an inclined surface, and a fitting clearance is provided between the end of the inclined surface away from the shoulder and the valve cavity.

[0005] Furthermore, both sides of the shoulder are provided with annular grooves, and the inner end of the sealing elastic ring is fitted into the annular groove.

[0006] Furthermore, the inner end of the sealing elastic ring is an annular retaining block, which is fitted into an annular retaining groove.

[0007] Furthermore, the sealing elastic ring is an elastic rubber ring.

[0008] The beneficial effects of this utility model are: This invention features sealing elastic rings on both sides of the shoulder, each with a V-groove. When oil flows, the V-groove expands outwards, sealing against the inner wall of the valve cavity and sealing the end of the gap between the shoulder and the valve cavity, reducing the likelihood of particulate contaminants entering. Even if part of the shoulder moves to the oil outlet, the oil is guided through the V-groove into the corresponding outlet, further reducing the chance of particulate contaminants entering the gap between the shoulder and the valve cavity. This reduces the likelihood of valve core movement being obstructed or jammed, thus extending the service life of the proportional directional valve.

[0009] The outer side of the sealing elastic ring of this utility model is inclined, and a fitting gap is provided between it and the valve cavity. The fitting gap facilitates the installation and disassembly of the valve core in the valve cavity. At the same time, by setting the fitting gap, the contact area between the V-groove and the valve cavity seal is minimized when the V-groove expands outward, and the friction force generated is minimized. Thus, while achieving a seal, the flexible movement of the valve core is not affected. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A magnified view of part A in the image.

[0012] Valve housing 1, valve chamber 2, oil outlet 3, oil inlet 4, oil return 5, shaft 6, shoulder 7, annular groove 8, sealing elastic ring 9, annular retaining block 10, V-groove 11, inclined surface 12, fitting clearance 13. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] like Figure 1-2 As shown, a proportional directional valve includes a valve housing 1, within which a valve chamber 2 is provided. The valve chamber 2 has an oil outlet 3, an oil inlet 4, and an oil return port 5. An axially movable valve core is disposed within the valve chamber 2, and the valve core is connected to a proportional electromagnet, thereby controlling its axial movement. The valve core includes a shaft 6, on which shoulders 7 are fixed at intervals. The shoulders 7 move with the shaft 6, thereby adjusting the oil supply and discharge paths.

[0015] Both sides of the shoulder 7 are provided with annular grooves 8, and sealing elastic rings 9 are fitted into the annular grooves 8. The inner end of the sealing elastic ring 9 is an annular locking block 10, which is fitted into the annular groove 8. The sealing elastic ring 9 is a wear-resistant elastic rubber ring. The diameter of the annular groove 8 is slightly larger than the inner diameter of the sealing elastic ring 9. Because the sealing elastic ring 9 has a certain elasticity, it is easy to fit it into the annular groove 8 and ensure the stability of the fitting. Because the fitting is connected, it is also easy to remove and replace it later.

[0016] The sealing elastic ring 9 has an annular V-groove 11 on the side away from the shoulder 7. The outer side of the sealing elastic ring 9 is an outwardly extending inclined surface 12. A fitting gap 13 is provided between the end of the inclined surface 12 away from the shoulder 7 and the inner wall of the valve cavity 2. This fitting gap 13 can be the same as the gap between the shoulder 7 and the inner wall of the valve cavity 2, or it can be slightly larger or slightly smaller than the gap between the shoulder 7 and the inner wall of the valve cavity 2. The fitting gap 13 facilitates the installation and removal of the valve core in the valve cavity 2.

[0017] The size of the gap 13 only needs to ensure that the V-groove 11 opens outward under the action of the oil, and that the outer edge of the sealing elastic ring 9 abuts against the valve cavity 2. This achieves end sealing of the gap between the shoulder 7 and the inner wall of the valve cavity 2, reducing the probability of microparticle impurities in the oil entering the gap, thereby reducing the probability of valve core movement jamming. Even if part of the shoulder 7 moves to the oil outlet 3, the oil is guided into the corresponding oil outlet 3 through the V-groove 11, further reducing the probability of particulate contaminants entering the gap between the shoulder 7 and the valve cavity 2. In addition, because the contact area between the outer edge of the sealing elastic ring 9 and the valve cavity 2 is small, it does not affect the movement of the valve core.

[0018] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A proportional directional valve, comprising a valve housing, a valve chamber disposed within the valve housing, a valve core that moves axially within the valve chamber, the valve core comprising a shaft, and shoulders spaced apart on the shaft, characterized in that: Both sides of the shoulder are equipped with detachable sealing elastic rings. The side of the sealing elastic ring away from the shoulder is provided with an annular V-groove. The outer side of the sealing elastic ring is an inclined surface, and the end of the inclined surface away from the shoulder is provided with a fitting clearance between it and the inner wall of the valve cavity.

2. A proportional directional valve according to claim 1, characterized in that: Both sides of the shoulder are provided with annular grooves, and the inner end of the sealing elastic ring is fitted into the annular groove.

3. A proportional directional valve according to claim 2, characterized in that: The inner end of the sealing elastic ring is an annular retaining block, which is fitted into an annular retaining groove.

4. A proportional directional valve according to any one of claims 1-3, characterized in that: The sealing ring is an elastic rubber ring.

Images