A two-way cartridge valve

Abstract

The utility model discloses a two -way plug -in valve, including valve body, valve bush and valve core. Be equipped with plug -in valve hole and pressure oil channel in the valve body, and the annular oil cavity is integrally formed through casting at the intersection of plug -in valve hole and pressure oil channel. The valve bush lower part is evenly distributed with pressure oil hole corresponding annular oil cavity circumference, and the bottom is equipped with axial through -hole and stepped annular boss, and is matched with the valve hole step in the valve body. The valve core is cylindrical structure, and is nested in the valve bush, and is the precise gap cooperation between the valve bush. The valve core is equipped with sealing groove, and the built -in combination sealing part includes the first sealing ring of rectangular section and the second sealing ring located in its inside, to improve the sealing property and reduce the friction. The pressure oil hole of valve bush is equipped with second sealing groove and valve bush sealing ring above, and the stepped annular boss is equipped with step sealing ring, and the step sealing ring both sides are equipped with the baffle ring. The upper edge of axial through -hole is equipped with sealing cone surface, and is matched with the sealing blade edge of valve core bottom.

Description

Technical Field

[0001] This utility model belongs to the technical field of cartridge valves, and mainly relates to a two-way cartridge valve. Background Technology

[0002] Two-way cartridge valves are characterized by high flow capacity, fast response speed, and high standardization, making them ideal for building high-pressure, high-flow hydraulic systems. They can also be highly integrated into the valve block, resulting in a compact system structure, fewer leakage points, and the ability to flexibly achieve multiple functions by changing the pilot control method. However, the structure of current two-way cartridge valves on the market is not entirely reasonable, such as... Figure 1 As shown, the valve sleeve is designed with a large shoulder step, which creates a large annular oil passage cavity on the outside of the valve sleeve. Although this increases the oil passage area, the valve core size is large due to this structure, resulting in a large valve body volume. Furthermore, the seal between the valve core and the valve sleeve is not tight enough, and the pressure holding effect is poor. Although using conventional sealing gaskets can increase the sealing performance, if the seal is tight enough, it will increase the friction between the valve core and the valve sleeve, resulting in a slower opening and closing speed. Summary of the Invention

[0003] This utility model provides a two-way cartridge valve, including a valve body, a valve sleeve, and a valve core. The valve body is provided with a cartridge valve hole and a pressure oil passage. The valve sleeve is disposed in the cartridge valve hole. An annular oil cavity is provided at the intersection of the cartridge valve hole and the pressure oil passage. Pressure oil holes are evenly distributed around the lower part of the valve sleeve corresponding to the annular oil cavity. An axial through hole is provided at the bottom of the valve sleeve. The annular oil cavity is integrally formed inside the valve body by casting. Both the valve sleeve and the valve core are cylindrical structures. The valve core is nested inside the valve sleeve. A combined sealing component is provided between the valve core and the valve sleeve. A valve hole step is provided below the annular oil cavity in the valve body. A stepped annular boss is provided at the bottom of the valve sleeve.

[0004] Furthermore, the outer wall of the valve core and the inner wall of the valve sleeve are precisely fitted with a clearance. A sealing groove is provided on the valve core. The sealing groove is located on the circumferential surface above the pressure oil hole and is in close contact with the valve body. A combined sealing component is provided in the sealing groove. The combined sealing component includes a first sealing ring and a second sealing ring. The second sealing ring is located inside the sealing groove of the valve core, and the first sealing ring is located outside the second sealing ring and is in close contact with the valve sleeve. The cross-section of the first sealing ring is rectangular.

[0005] Furthermore, the stepped annular boss at the bottom of the valve sleeve mates with the valve hole step, and a stepped sealing ring is also provided on the annular boss. A second sealing groove is also provided on the valve sleeve, which is located above the pressure oil hole of the valve sleeve, and a valve sleeve sealing ring is provided in the second sealing groove.

[0006] Furthermore, both the step seal ring and the valve sleeve seal ring are made of elastic rubber rings with a circular cross-section.

[0007] Furthermore, retaining rings are provided on both sides of the stepped sealing ring and the valve sleeve sealing ring.

[0008] Furthermore, a sealing cone surface is provided at the upper edge of the axial through hole, and a sealing edge that mates with the sealing cone surface at the upper part of the axial through hole is provided at the bottom edge of the valve core.

[0009] The beneficial effects of this utility model are as follows: By setting a combined sealing ring with a first sealing ring and a second sealing ring on the contact surface between the valve core and the valve sleeve, the sealing performance can be improved, the friction between the valve sleeve and the valve core can be reduced, the opening and closing speed can be increased, and the leakage on both sides of the valve core can be reduced, thus achieving a better pressure holding effect. By optimizing the shoulder step on the valve sleeve and casting the annular oil cavity onto the valve body, the valve sleeve size is reduced while ensuring the oil passage area, making the overall structure simpler and the valve body volume further reduced, thus reducing manufacturing costs and improving performance stability. The vertical insert valve hole and the bottom valve hole step increase the tolerance of the axial through hole and the valve core insert hole during the processing. Even if slight eccentricity occurs, it will not affect the sealing effect of the step sealing ring, avoiding the risk of reduced pressure holding effect due to eccentricity during processing, and the step sealing gasket will not be damaged during the insertion process. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the internal structure of a conventional two-way valve; Figure 2 This is a schematic cross-sectional view of the internal structure of this utility model; in: 1-Valve body, 11-Valve orifice step, 2-Valve sleeve, 21-Shoulder step, 22-Step seal ring, 3-Valve core, 4-Combined sealing component, 41-First sealing ring, 42-Second sealing ring, 5-Annular oil cavity, 6-Spring, 7-Valve sleeve sealing ring, 8-Axial through hole, 9-Pressure oil hole, 10-Steel retainer. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0012] like Figure 2As shown, a two-way cartridge valve includes a valve body 1, a valve sleeve 2, and a valve core 3. The valve body 1 is provided with a cartridge valve hole and a pressure oil passage. The valve sleeve 2 is inserted into the cartridge valve hole on the valve body 1. An annular oil cavity 5 is provided at the intersection of the cartridge valve hole and the pressure oil passage. The annular oil cavity 5 is set in the valve body 1 by casting. A valve hole step 11 is provided below the annular oil cavity 5 in the valve body 1.

[0013] The valve sleeve 2 has a cylindrical structure and can be inserted into the valve hole to precisely fit the inner wall of the valve hole on the valve body 1. The bottom of the valve sleeve 2 is provided with a stepped annular boss. The annular boss and the valve hole step 11 cooperate to increase the sealing between the valve sleeve 2 and the valve body 1. The annular boss is also provided with a stepped sealing ring 22. The stepped sealing ring 22 is a rubber ring with a circular cross-section. Pressure oil holes 9 are evenly distributed around the bottom of the valve sleeve 2 corresponding to the annular oil cavity 5. The valve sleeve 2 is also provided with a second sealing groove. The second sealing groove is located on the circumferential surface above the pressure oil holes 9 of the valve sleeve 2 and is in close contact with the valve body 1. The valve sleeve sealing ring 7 is provided in the second sealing groove. The valve sleeve sealing ring 7 is a rubber ring with a circular cross-section. The bottom of the valve sleeve 2 is provided with an axial through hole 8. A sealing cone surface is also provided at the upper edge of the axial through hole 8.

[0014] The valve core 3 adopts a cylindrical structure and is set inside the valve sleeve 2. The outer wall of the valve core 3 is precisely clearance-fitted with the inner wall of the valve sleeve 2. The bottom edge of the valve core 3 is provided with a sealing edge that matches the sealing cone surface on the upper part of the axial through hole 8, which can improve the sealing performance of the valve core and form an effective limit. A sealing groove is provided on the valve core 3, which is located between the upper part of the pressure oil hole 9 of the valve sleeve 2 and the valve core 3. A combined sealing component 4 is provided in the sealing groove of the valve core 3.

[0015] The combined sealing component 4 includes a first sealing ring 41 and a second sealing ring 42. The second sealing ring 42 is disposed inside the sealing groove of the valve core 3, and the first sealing ring 41 is disposed outside the second sealing ring and fits against the valve sleeve 2. The cross-section of the first sealing ring 41 is rectangular.

[0016] During use, the valve core 3 closes under the action of the spring, and the bottom of the valve core 3 mates with the contact surface of the axial through hole 8. At the same time, the combined sealing component 4 forms a further seal. Under the elastic action of the second sealing ring 42, the first sealing ring 41 always maintains a tight fit with the inner wall of the valve sleeve 2, and the rectangular cross-section increases the sealing area between the valve sleeve 2 and the valve core 3, thereby enhancing the sealing effect. At the same time, the material of the first sealing ring 41 is wear-resistant, which can ensure that the valve core can still maintain the sealing effect under frequent operation. The annular boss and stepped sealing ring 22 provided on the valve sleeve 2 increase the sealing between the valve body 1 and the valve sleeve 2, and enhance the overall pressure holding effect. At the same time, the shoulder step 21 is removed from the upper part of the valve sleeve 2, and the annular oil cavity 5 inside the valve body 1 is further reduced.

[0017] Retaining rings 10 can also be provided on both sides of the stepped sealing ring 22 and the valve sleeve sealing ring 7. The retaining rings 10 can provide solid support for the stepped sealing ring and the valve sleeve sealing ring, reduce the creep and twisting of the stepped sealing ring 22 and the valve sleeve sealing ring 7 in the groove, avoid the bite caused by the change of gap, and further enhance its dynamic sealing effect.

Claims

1. A two-way cartridge valve, comprising: The valve body (1), valve sleeve (2) and valve core (3) are provided. The valve body (1) is provided with a cartridge valve hole and a pressure oil passage. The valve sleeve (2) is provided in the cartridge valve hole. An annular oil cavity (5) is provided at the intersection of the cartridge valve hole and the pressure oil passage. Pressure oil holes (9) are evenly distributed around the lower part of the valve sleeve (2) corresponding to the annular oil cavity (5). An axial through hole (8) is provided at the bottom of the valve sleeve (2). The annular oil cavity (5) is integrally formed inside the valve body (1) by casting. The valve sleeve (2) and the valve core (3) are both cylindrical structures. The valve core (3) is nested in the valve sleeve (2). A combined sealing component (4) is provided between the valve core (3) and the valve sleeve (2). A valve hole step (11) is provided below the annular oil cavity (5) in the valve body (1). A stepped annular boss is provided at the bottom of the valve sleeve (2).

2. A two-way cartridge valve as described in claim 1, characterized in that: The outer wall of the valve core (3) is precisely fitted with the inner wall of the valve sleeve (2). A sealing groove is provided on the valve core (3). The sealing groove is located on the circumferential surface above the pressure oil hole (9) and closely fits the valve body (1). A combined sealing component (4) is provided in the sealing groove. The combined sealing component (4) includes a first sealing ring (41) and a second sealing ring (42). The second sealing ring (42) is located inside the sealing groove of the valve core (3). The first sealing ring (41) is located outside the second sealing ring (42) and fits the valve sleeve (2). The cross-section of the first sealing ring (41) is rectangular.

3. A two-way cartridge valve as described in claim 2, characterized in that: The stepped annular boss at the bottom of the valve sleeve (2) cooperates with the valve hole step (11). A step sealing ring (22) is also provided on the annular boss. A second sealing groove is also provided on the valve sleeve (2). The second sealing groove is located above the pressure oil hole (9) of the valve sleeve (2). A valve sleeve sealing ring (7) is provided in the second sealing groove.

4. A two-way cartridge valve as described in claim 3, characterized in that: Both the stepped sealing ring (22) and the valve sleeve sealing ring (7) are made of elastic rubber rings with a circular cross-section.

5. A two-way cartridge valve as described in any one of claims 3 or 4, characterized in that: As mentioned above, retaining rings (10) are provided on both sides of the stepped sealing ring (22) and the valve sleeve sealing ring (7).

6. A two-way cartridge valve as described in any one of claims 1-4, characterized in that: A sealing cone surface is provided at the upper edge of the axial through hole (8), and a sealing edge that cooperates with the sealing cone surface at the upper part of the axial through hole (8) is provided at the bottom edge of the valve core (3).

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