Outer sealing structure of hydraulic oil cylinder

Abstract

The utility model discloses an outer sealing structure of a hydraulic oil cylinder, which belongs to the technical field of oil cylinder sealing, and comprises a cover thread arranged on the inner side wall of an end cover and a sealing component arranged on the outer side wall of the end part of a barrel body, and when the end cover is connected to the end part of the barrel body, the sealing component is matched with the cover thread and is used for sealing the end part of the barrel body; a cavity is formed in the barrel, a movable rod is arranged in the cavity, a piston is fixedly arranged at the end, located in the barrel, of the movable rod, and the piston is in sliding connection with the inner wall of the cavity through a piston sealing piece; the left end of the barrel communicates with a first oil inlet pipe, and the right end of the barrel communicates with a second oil inlet pipe. When the sealing ring is aged, the sealing performance of the sealing ring is gradually weakened, and leakage is caused, the sealing assembly serves as a second defensive line, leakage of hydraulic oil is effectively avoided, normal operation of the hydraulic oil cylinder is protected, and the service life of the hydraulic oil cylinder is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil cylinder sealing, and in particular relates to an external sealing structure of a hydraulic oil cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference on both sides. The hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The seal is a mechanism to prevent the leakage of the working medium (internal leakage and external leakage) and to prevent foreign matter (such as air, dust and water, etc.) from entering the hydraulic components and hydraulic systems. In order to ensure that the hydraulic oil in the cylinder is not easy to leak out, a sealing ring is arranged outside the end cover, which is squeezed and contacted with the inner wall of the cylinder and the surface of the end cover to achieve sealing. The seal here is a static seal. However, when it is in an extruded state for a long time, the sealing ring is prone to aging, resulting in its sealing gradually weakening, resulting in leakage. Therefore, a structure of external sealing of the hydraulic cylinder is required to prevent the leakage of hydraulic oil when the sealing performance of the end cover is weakened. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide an external sealing structure for a hydraulic oil cylinder, thereby solving the problems in the above-mentioned background technology.

[0004] The purpose of the utility model is achieved as follows: a hydraulic oil cylinder external sealing structure, which includes a cover thread arranged on the inner wall of the end cover, and a sealing component arranged on the outer wall of the end of the cylinder, when the end cover is connected to the end of the cylinder, the sealing component and the cover thread cooperate with each other to seal the end of the cylinder; a cavity is arranged inside the cylinder, a movable rod is arranged inside the cavity, a piston is fixedly arranged at the end of the movable rod located inside the cylinder, and the piston is slidably connected to the inner wall of the cavity through a piston seal; the left end of the cylinder is connected to a first oil inlet pipe, and the right end of the cylinder is connected to a second oil inlet pipe.

[0005] Furthermore, the sealing assembly includes a groove opened on the outer wall of the cylinder, a deformable sealing block is fixedly provided inside the groove, and the upper end of the sealing block protrudes upward above the groove, and a part above the groove is an exposed part; when the end cover is screwed into the top of the groove, the exposed part of the sealing block is squeezed and deformed inside the groove.

[0006] Furthermore, the sealing block includes a fixing portion, which is used to fix the sealing block inside the groove, and a Y-shaped deformation portion is fixedly provided at the left end of the fixing portion, and the upper arm of the Y-shaped deformation portion extends to the upper outside of the groove.

[0007] Furthermore, an outer wall of the upper arm of the Y-shaped deformation portion is provided with a first auxiliary thread corresponding to the cover thread.

[0008] Furthermore, the fixing portion and the Y-shaped deformation portion are integrally formed.

[0009] Preferably, the sealing block comprises a fixing rod, which is used to fix the sealing block inside the groove, and a plurality of V-shaped deformation parts are fixedly provided on the outside of the fixing rod, and the upper arm of the V-shaped deformation part extends to the upper outside of the groove.

[0010] Preferably, the ends of the upper arm and the lower arm of the V-shaped deformation portion are respectively fixedly provided with an upper matching portion and a lower matching portion, the outer wall of the upper matching portion is provided with a second auxiliary thread corresponding to the cover thread, and the lower matching portion is fixedly connected to the inner bottom surface of the groove.

[0011] Preferably, the fixing rod, the plurality of V-shaped deformation portions, the upper matching portion and the lower matching portion are integrally formed.

[0012] The beneficial effects of the utility model are as follows: by arranging a cover thread on the inner side wall of the end cover and arranging a sealing assembly on the outer side wall of the end of the cylinder, when the end cover is connected to the end of the cylinder, the sealing assembly is deformed, and under the stress of the deformation, the end cover and the cylinder are in a sealed state. When the sealing ring ages, causing its sealing performance to gradually weaken and leak out, the sealing assembly is the second line of defense, effectively preventing hydraulic oil from leaking out, protecting the normal operation of the hydraulic cylinder, and extending the service life of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 The utility model Figure 1 Middle A: Enlarged view;

[0015] Figure 3 It is a schematic diagram of the sealing block structure of Example 3 of the utility model.

[0016] In the figure: 1, cover thread 2, cylinder 3, cavity 4, movable rod 5, piston 6, piston seal 7, first oil inlet pipe 8, second oil inlet pipe 9, groove 10, fixing part 11, Y-shaped deformation part 12, fixing rod 13, V-shaped deformation part 14, upper matching part 15, lower matching part 16, end cover. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the present invention in conjunction with the accompanying drawings. It should be noted that all directional words such as up, down, front, back, left, and right that appear in the present invention are based on Figure 1 The directional words are made for reference figures, and all directional words do not limit the utility model, but are only for more clear description and explanation of the utility model. Example

[0018] like Figure 1-3 As shown, this embodiment discloses a hydraulic cylinder external sealing structure, which includes a cover thread 1 arranged on the inner wall of the end cover 16, and a sealing assembly arranged on the outer wall of the end of the cylinder 2. When the end cover 16 is connected to the end of the cylinder 2, the sealing assembly and the cover thread 1 cooperate with each other to seal the end of the cylinder 2; a cavity 3 is arranged inside the cylinder 2, and a movable rod 4 is arranged inside the cavity 3. A piston 5 is fixedly arranged at the end of the movable rod 4 located inside the cylinder 2, and the piston 5 is slidably connected to the inner wall of the cavity 3 through a piston seal 6; a first oil inlet pipe 7 is connected to the left end of the cylinder 2, and a second oil inlet pipe 8 is connected to the right end of the cylinder 2.

[0019] In this embodiment, the cover thread 1 is provided on the inner wall of the end cover 16, and the sealing assembly is provided on the outer wall of the end of the cylinder 2. When the end cover 16 is connected to the end of the cylinder 2, the sealing assembly is deformed, and under the stress of the deformation, the end cover 16 and the cylinder 2 are in a sealed state. When the sealing ring ages, causing its sealing performance to gradually weaken and leak, the sealing assembly is the second line of defense, effectively preventing the hydraulic oil from leaking, protecting the normal operation of the hydraulic cylinder, and extending the service life of the hydraulic cylinder. Example

[0020] like Figure 1-3As shown, this embodiment discloses a hydraulic cylinder external sealing structure, which includes a cover thread 1 arranged on the inner side wall of the end cover 16, and a sealing assembly arranged on the outer side wall of the end of the cylinder 2. When the end cover 16 is connected to the end of the cylinder 2, the sealing assembly cooperates with the cover thread 1 to seal the end of the cylinder 2; a cavity 3 is arranged inside the cylinder 2, and a movable rod 4 is arranged inside the cavity 3. A piston 5 is fixedly arranged at the end of the movable rod 4 located inside the cylinder 2, and the piston 5 is slidably connected to the inner wall of the cavity 3 through a piston seal 6; the left end of the cylinder 2 is connected to a first oil inlet pipe 7, and the right end of the cylinder 2 is connected to a second oil inlet pipe 8. By arranging the cover thread 1 on the inner side wall of the end cover 16 and the sealing assembly on the outer side wall of the end of the cylinder 2, when the end cover 16 is connected to the end of the cylinder 2, the sealing assembly is deformed, and under the stress of the deformation, the end cover 16 and the cylinder 2 are in a sealed state. When the sealing ring ages and its sealing performance gradually weakens, resulting in leakage, the sealing assembly is the second line of defense, effectively preventing hydraulic oil leakage, protecting the normal operation of the hydraulic cylinder, and extending the service life of the hydraulic cylinder.

[0021] In order to achieve better effect, the sealing assembly includes a groove 9 opened on the outer wall of the cylinder 2, a deformable sealing block is fixed inside the groove 9, and the upper end of the sealing block protrudes upward above the groove 9, and a part above the groove 9 is an exposed part; when the end cover 16 is screwed into the groove 9, the exposed part of the sealing block is squeezed and deformed inside the groove 9.

[0022] For better effect, the sealing block includes a fixing portion 10, which is used to fix the sealing block inside the groove 9. A Y-shaped deformation portion 11 is fixed to the left end of the fixing portion 10, and the upper arm of the Y-shaped deformation portion 11 extends to the upper outside of the groove 9.

[0023] For better effect, the outer wall of the upper arm of the Y-shaped deformation portion 11 is provided with a first auxiliary thread corresponding to the cover thread 1 .

[0024] For better effect, the fixing portion 10 and the Y-shaped deformation portion 11 are integrally formed. Example

[0025] like Figure 1-3As shown, this embodiment discloses a hydraulic cylinder external sealing structure, which includes a cover thread 1 arranged on the inner side wall of the end cover 16, and a sealing assembly arranged on the outer side wall of the end of the cylinder 2. When the end cover 16 is connected to the end of the cylinder 2, the sealing assembly cooperates with the cover thread 1 to seal the end of the cylinder 2; a cavity 3 is arranged inside the cylinder 2, and a movable rod 4 is arranged inside the cavity 3. A piston 5 is fixedly arranged at the end of the movable rod 4 located inside the cylinder 2, and the piston 5 is slidably connected to the inner wall of the cavity 3 through a piston seal 6; the left end of the cylinder 2 is connected to a first oil inlet pipe 7, and the right end of the cylinder 2 is connected to a second oil inlet pipe 8. By arranging the cover thread 1 on the inner side wall of the end cover 16 and the sealing assembly on the outer side wall of the end of the cylinder 2, when the end cover 16 is connected to the end of the cylinder 2, the sealing assembly is deformed, and under the stress of the deformation, the end cover 16 and the cylinder 2 are in a sealed state. When the sealing ring ages and its sealing performance gradually weakens, resulting in leakage, the sealing assembly is the second line of defense, effectively preventing hydraulic oil leakage, protecting the normal operation of the hydraulic cylinder, and extending the service life of the hydraulic cylinder.

[0026] In order to achieve better effect, the sealing assembly includes a groove 9 opened on the outer wall of the cylinder 2, a deformable sealing block is fixed inside the groove 9, and the upper end of the sealing block protrudes upward above the groove 9, and a part above the groove 9 is an exposed part; when the end cover 16 is screwed into the groove 9, the exposed part of the sealing block is squeezed and deformed inside the groove 9.

[0027] For better effect, the sealing block includes a fixing rod 12, which is used to fix the sealing block inside the groove 9. A plurality of V-shaped deformation parts 13 are fixedly arranged on the outside of the fixing rod 12, and the upper arm of the V-shaped deformation part 13 extends to the upper outside of the groove 9.

[0028] In order to achieve better effect, the ends of the upper arm and the lower arm of the V-shaped deformation portion 13 are respectively fixed with an upper matching portion 14 and a lower matching portion 15, the outer wall of the upper matching portion 14 is provided with a second auxiliary thread corresponding to the cover thread 1, and the lower matching portion 15 is fixedly connected to the inner bottom surface of the groove 9.

[0029] For better effect, the fixing rod 12, the plurality of V-shaped deformation portions 13, the upper matching portion 14 and the lower matching portion 15 are integrally formed.

[0030] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic cylinder external sealing structure, characterized in that: The invention comprises a cover thread (1) arranged on the inner side wall of an end cover (16), and a sealing assembly arranged on the outer side wall of the end of a cylinder (2); when the end cover (16) is connected to the end of the cylinder (2), the sealing assembly and the cover thread (1) cooperate with each other to seal the end of the cylinder (2); a cavity (3) is arranged inside the cylinder (2); a movable rod (4) is arranged inside the cavity (3); a piston (5) is fixedly arranged at the end of the movable rod (4) located inside the cylinder (2); the piston (5) and the inner wall of the cavity (3) are slidably connected via a piston sealing member (6); a first oil inlet pipe (7) is connected to the left end of the cylinder (2), and a second oil inlet pipe (8) is connected to the right end of the cylinder (2).

2. The hydraulic cylinder outer sealing structure according to claim 1, characterized in that: The sealing assembly comprises a groove (9) formed on the outer wall of the cylinder (2), a deformable sealing block being fixedly arranged inside the groove (9), and an upper end of the sealing block protruding upward above the groove (9), with a portion above the groove (9) being an exposed portion; when the end cover (16) is screwed into the groove (9), the exposed portion of the sealing block is squeezed and deformed inside the groove (9).

3. The hydraulic cylinder outer sealing structure according to claim 2 is characterized in that: The sealing block comprises a fixing portion (10), the fixing portion (10) being used to fix the sealing block inside the groove (9), a Y-shaped deformation portion (11) being fixedly provided at the left end of the fixing portion (10), and an upper arm of the Y-shaped deformation portion (11) extending to the upper outside of the groove (9).

4. The hydraulic cylinder outer sealing structure according to claim 3 is characterized in that: The outer wall of the upper arm of the Y-shaped deformation portion (11) is provided with a first auxiliary thread corresponding to the cover thread (1).

5. The hydraulic cylinder outer sealing structure according to claim 2, characterized in that: The sealing block comprises a fixing rod (12), the fixing rod (12) being used to fix the sealing block inside the groove (9), a plurality of V-shaped deformation parts (13) being fixedly provided outside the fixing rod (12), and upper arms of the V-shaped deformation parts (13) extending to the upper outside of the groove (9).

6. The hydraulic cylinder outer sealing structure according to claim 5, characterized in that: An upper matching portion (14) and a lower matching portion (15) are fixedly provided at the ends of the upper arm and the lower arm of the V-shaped deformation portion (13), respectively; the outer wall of the upper matching portion (14) is provided with a second auxiliary thread corresponding to the cover thread (1); and the lower matching portion (15) is fixedly connected to the inner bottom surface of the groove (9).

7. The hydraulic cylinder outer sealing structure according to claim 4, characterized in that: The fixing portion (10) and the Y-shaped deformation portion (11) are integrally formed.

8. The hydraulic cylinder outer sealing structure according to claim 6, characterized in that: The fixing rod (12), the plurality of V-shaped deformation portions (13), the upper matching portion (14) and the lower matching portion (15) are integrally formed.

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