Bidirectional sealing piston

Abstract

The utility model relates to a bidirectional sealing piston. The bidirectional sealing piston comprises a U-shaped sealing ring and an assembly seal, the U-shaped sealing ring and the assembly seal are arranged outside the piston main body in a sleeving manner; the assembly seal comprises two side sealing rings, the side sealing rings are arranged outside the piston body in a sleeving mode, a main sealing ring is arranged between the two side sealing rings, and side face stress grooves are formed in the two sides of the main sealing ring correspondingly. The side, facing the main sealing ring, of each side sealing ring is provided with a protruding block extending into the corresponding side face stress groove. By arranging the side sealing rings and the main sealing ring, the effect of improving the sealing performance is achieved, when one side of the piston is extruded by hydraulic oil, the side sealing ring on the side slightly displaces in the axial direction of the piston block, the displaced side sealing ring extrudes the main sealing ring through the protruding block, and therefore the sealing performance of the piston is improved. And the main sealing ring is slightly and elastically deformed, so that the main sealing ring is more tightly attached to the inner wall of the oil cylinder.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic piston technology, specifically to a bidirectional sealing piston. Background Technology

[0002] The piston is the most important structure of a hydraulic cylinder. Hydraulic oil is introduced into the hydraulic cylinder to push the piston to move. During the piston's movement, it is necessary to ensure good sealing between the piston and the inner wall of the hydraulic cylinder. Therefore, common pistons usually use sealing rings for sealing.

[0003] When the piston is used vertically, it tends to move downwards due to the weight of the piston and piston rod. Therefore, when the seal ring leaks slightly due to wear or other reasons, the piston will slowly descend under the influence of gravity, which will weaken the effect of the hydraulic cylinder. Therefore, a bidirectional sealing piston is proposed to solve the above-mentioned problems. Utility Model Content

[0004] Based on the above description, this utility model provides a bidirectional sealing piston to solve the problem that the sealing effect of existing hydraulic cylinder pistons deteriorates due to wear during use, leading to piston downward movement.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a bidirectional sealing piston, comprising: a U-shaped sealing ring and an assembly of seals;

[0006] The U-shaped sealing ring and the assembly are both sleeved on the outside of the piston body;

[0007] The assembly and seal include two side sealing rings, which are fitted onto the outside of the piston body. A main sealing ring is provided between the two side sealing rings. Side force-bearing grooves are provided on both sides of the main sealing ring. A protrusion extending into the side force-bearing groove is provided on the side of the side sealing ring facing the main sealing ring.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the piston body includes a piston block, and a first mounting groove, a second mounting groove, and a third mounting groove are provided on the circumferential surface of the piston block. There are two second mounting grooves, and the third mounting groove is disposed between the two second mounting grooves.

[0010] Furthermore, a U-shaped sealing ring is provided inside the first mounting groove and fitted onto the outside of the piston block.

[0011] Furthermore, the third mounting groove is provided with a main sealing ring sleeved on the outside of the piston block. The main sealing ring includes a sealing ring body with a T-shaped cross-section. The width of the T-shaped cross-section facing the piston block is smaller than the width of the cross-section facing away from the piston block.

[0012] Furthermore, the sealing ring body is provided with an annular groove along the outer ring, and the sealing ring body is provided with side force grooves on both sides facing the side sealing ring.

[0013] Furthermore, the second mounting groove is provided with a side sealing ring sleeved on the outside of the piston block. The side sealing ring includes an annular ring, with a force-bearing groove on the side of the annular ring away from the main sealing ring, and a protrusion and a sealing strip on the side facing the sealing ring body.

[0014] Furthermore, the protrusion extends into the interior of the side force groove and contacts the inner wall of the side force groove.

[0015] Furthermore, the sealing strip has a V-shaped cross-section, with the V-shaped opening facing the main sealing ring and tightly fitting against the inner wall of the second mounting groove.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0017] 1. This utility model, by setting components such as a group seal and a U-shaped sealing ring, and through the cooperation between the group seal and the U-shaped sealing ring, enables the piston to have a double sealing effect, and the piston sealing performance is increased through the cooperation between the group seal and the U-shaped sealing ring;

[0018] 2. By setting the side sealing ring and the main sealing ring, the sealing performance is increased. When one side of the piston is squeezed by hydraulic oil, the side sealing ring on that side is slightly displaced along the axial direction of the piston block. After the displacement, the side sealing ring squeezes the main sealing ring through the protrusion, causing the main sealing ring to undergo slight elastic deformation, thereby making the main sealing ring fit more tightly with the inner wall of the cylinder. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of a bidirectional sealing piston provided in an embodiment of this utility model;

[0020] Figure 2 for Figure 1 Structural sectional view;

[0021] Figure 3 for Figure 2 Another structural diagram from another perspective;

[0022] Figure 4for Figure 3 A magnified view of a portion of region A in the middle;

[0023] Figure 5 This is a schematic diagram of the piston body in an embodiment of the present invention;

[0024] Figure 6 for Figure 5 Another structural diagram from another perspective;

[0025] Figure 7 This is a schematic diagram of the structure of the U-shaped sealing ring in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the side sealing ring in an embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the main sealing ring in an embodiment of the present invention;

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Piston body; 11. Piston block; 12. First mounting groove; 13. Second mounting groove; 14. Third mounting groove; 2. U-shaped sealing ring; 3. Side sealing ring; 31. Annular ring; 32. Force-bearing groove; 33. Protrusion; 34. Sealing strip; 4. Main sealing ring; 41. Sealing ring body; 42. Side force-bearing groove; 43. Annular groove. Detailed Implementation

[0030] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0033] Please see Figure 1 , Figure 2 , Figures 5-7 A bidirectional sealing piston, comprising: a U-shaped sealing ring 2 and a seal;

[0034] The U-shaped sealing ring 2 and the assembly are both sleeved on the outside of the piston body 1;

[0035] The piston body 1 includes a piston block 11. The piston block 11 has a first mounting groove 12, a second mounting groove 13 and a third mounting groove 14 on its circumferential surface. There are two second mounting grooves 13. The third mounting groove 14 is located between the two second mounting grooves 13. A U-shaped sealing ring 2 is provided inside the first mounting groove 12 and sleeved on the outside of the piston block 11.

[0036] Based on the above, the U-shaped sealing ring 2 achieves a preliminary sealing effect, and the first mounting groove 12, the second mounting groove 13, and the third mounting groove 14 respectively limit the position of the U-shaped sealing ring 2, the side sealing ring 3, and the main sealing ring 4.

[0037] like Figures 2-4 as well as Figure 9 As shown, the assembly and seal includes two side sealing rings 3, which are sleeved on the outside of the piston body 1. A main sealing ring 4 is provided between the two side sealing rings 3. Side force grooves 42 are provided on both sides of the main sealing ring 4. A protrusion 33 extending into the side force groove 42 is provided on the side of the side sealing ring 3 facing the main sealing ring 4.

[0038] The third mounting groove 14 is provided with a main sealing ring 4 sleeved on the outside of the piston block 11. The main sealing ring 4 includes a sealing ring body 41. The cross-section of the sealing ring body 41 is T-shaped. The width of the T-shaped cross-section facing the piston block 11 is smaller than the width of the end facing away from the piston block 11. The sealing ring body 41 is provided with an annular groove 43 along the outer ring. The sealing ring body 41 is provided with side force grooves 42 on both sides facing the side sealing ring 3.

[0039] Based on the above, the main sealing ring 4 plays a secondary sealing role. The annular groove 43 provides sufficient space for the elastic deformation of the main sealing ring 4, while the side force groove 42 cooperates with the protrusion 33. When the protrusion 33 squeezes the inner wall of the side force groove 42, the main sealing ring 4 undergoes elastic deformation, which makes it fit more tightly with the inner wall of the cylinder. The greater the pressure provided by the hydraulic oil, the tighter the main sealing ring 4 fits with the inner wall of the cylinder, which increases the sealing performance and avoids the situation where the sealing effect deteriorates due to wear.

[0040] like Figures 2-4 as well as Figure 8 As shown, the second mounting groove 13 is provided with a side sealing ring 3 sleeved on the outside of the piston block 11. The side sealing ring 3 includes an annular ring 31. The annular ring 31 is provided with a force-bearing groove 32 on the side away from the main sealing ring 4, and a protrusion 33 and a sealing strip 34 are provided on the side facing the sealing ring body 41.

[0041] The protrusion 33 extends into the interior of the side force groove 42 and contacts the inner wall of the side force groove 42. The cross-section of the sealing strip 34 is V-shaped, the opening of the V-shape faces the main sealing ring 4, and it fits tightly against the inner wall of the second mounting groove 13.

[0042] Based on the above, the side sealing ring 3 provides a triple sealing effect. When the side sealing ring 3 is subjected to hydraulic oil pressure, it moves along the piston body 1 towards the main sealing ring 4. During this process, the protrusion 33 squeezes the main sealing ring 4, causing it to undergo elastic deformation. That is, after the outer edge of the main sealing ring 4 undergoes elastic deformation, it fits more tightly with the inner wall of the cylinder. At this time, the sealing strip 34 plays a further sealing role, preventing hydraulic oil from leaking from the gap between the inner wall of the annular ring 31 and the piston block 11.

[0043] In summary, by setting up a U-shaped sealing ring 2, a side sealing ring 3, and a main sealing ring 4, this piston achieves a multi-stage sealing effect, increasing sealing performance. Furthermore, through the cooperation between the side sealing ring 3 and the main sealing ring 4, the hydraulic oil pushes the side sealing ring 3, causing the main sealing ring 4 to undergo elastic deformation. This results in a tighter fit between the main sealing ring 4 and the inner wall of the cylinder, further enhancing the sealing effect. Within certain limits, the higher the pressure, the better the sealing effect between the main sealing ring 4 and the inner wall of the cylinder.

[0044] 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 bidirectional sealing piston, characterized in that, include: U-shaped sealing ring (2) and assembly seal; The U-shaped sealing ring (2) and the assembly are both sleeved on the outside of the piston body (1); The assembly and seal include two side sealing rings (3), which are fitted onto the outside of the piston body (1). A main sealing ring (4) is provided between the two side sealing rings (3). Side force grooves (42) are provided on both sides of the main sealing ring (4). A protrusion (33) extending into the side force groove (42) is provided on the side of the side sealing ring (3) facing the main sealing ring (4).

2. The bidirectional sealing piston according to claim 1, characterized in that, The piston body (1) includes a piston block (11). The piston block (11) has a first mounting groove (12), a second mounting groove (13) and a third mounting groove (14) on its circumferential surface. There are two second mounting grooves (13), and the third mounting groove (14) is located between the two second mounting grooves (13).

3. The bidirectional sealing piston according to claim 2, characterized in that, The first mounting groove (12) is provided with a U-shaped sealing ring (2) that is sleeved on the outside of the piston block (11).

4. The bidirectional sealing piston according to claim 2, characterized in that, The third mounting groove (14) is provided with a main sealing ring (4) sleeved on the outside of the piston block (11). The main sealing ring (4) includes a sealing ring body (41). The cross-section of the sealing ring body (41) is T-shaped. The width of the T-shaped cross-section facing the piston block (11) is smaller than the width of the end facing away from the piston block (11).

5. The bidirectional sealing piston according to claim 4, characterized in that, The sealing ring body (41) has an annular groove (43) along its outer ring, and the sealing ring body (41) has side force grooves (42) on both sides facing the side sealing ring (3).

6. The bidirectional sealing piston according to claim 5, characterized in that, The second mounting groove (13) is provided with a side sealing ring (3) sleeved on the outside of the piston block (11). The side sealing ring (3) includes an annular ring (31). The annular ring (31) has a force-bearing groove (32) on the side away from the main sealing ring (4), and a protrusion (33) and a sealing strip (34) on the side facing the sealing ring body (41).

7. The bidirectional sealing piston according to claim 6, characterized in that, The protrusion (33) extends into the interior of the side force groove (42) and contacts the inner wall of the side force groove (42).

8. The bidirectional sealing piston according to claim 6, characterized in that, The sealing strip (34) has a V-shaped cross section, with the V-shaped opening facing the main sealing ring (4) and closely fitting the inner wall of the second mounting groove (13).

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