Sealing structure of a guide sleeve for hydraulic drive and hydraulic drive

Abstract

Sealing structure of a guide sleeve for a hydraulic drive, characterized in that the sealing structure comprises a guide sleeve body (1) of the hydraulic drive, a USH sealing ring (2), a first stepseal sealing ring (3) and a second stepseal sealing ring (4), wherein the guide sleeve body (1) is hollow on the inside and a first sealing groove, a second sealing groove and a third sealing groove are provided one after the other on the inside, and wherein the USH sealing ring (2) is located in the first sealing groove, the first stepseal sealing ring (3) is located in the second sealing groove and the second stepseal sealing ring (4) is located in the third sealing groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of sealing structures of a hydraulic drive, in particular a sealing structure of a guide sleeve for a hydraulic drive and a hydraulic drive. STATE OF THE ART

[0002] Existing seal types for hydraulic drives mainly include static seals and dynamic seals. A static seal is a seal that prevents the leakage of fluid when the seal part is in a relatively static state. A dynamic seal is a seal that prevents the leakage of fluid when the seal part is in a state of relative movement. Currently, as in Fig. 1, the guide sleeve of the 660 MW gasoline hydraulic actuator is sealed with two step seal rings. Furthermore, as disclosed in the present utility model with the publication number CN210978044U, a hydraulic actuator with two step seal rings for sealing the guide sleeve is provided, which in particular comprises a housing and a piston rod supported in the housing, wherein: a first mounting hole is provided at the first side end of the housing; the connecting end of the piston rod protrudes from the first mounting hole and is coaxially connected to the valve stem; first and second sealing rings are provided between the inner wall of the first mounting hole and the piston rod; an annular oil groove is provided on the contact surface between the inner wall of the first mounting hole and the piston rod, and the annular oil groove is located between the first sealing ring and the second sealing ring.

[0003] The sealing shape of the above-mentioned guide sleeve for petrol hydraulics has the following defects: The stepseal sealing ring can only be installed by deformation and cannot retain its original sealing properties, which can lead to oil leakage during operation. CONTENT OF THE PRESENT UTILITY MODEL

[0004] The purpose of the utility model is to provide a sealing structure of a guide sleeve for hydraulic drive and a hydraulic drive to solve the defect that the guide sleeve of the hydraulic drive in the prior art is only sealed by two stepseal sealing rings, and the assembly can only be carried out by deformation and the original sealing performance cannot be maintained, resulting in oil leakage during operation.

[0005] The purpose of the utility model can be achieved through the following technical solutions: A sealing structure of a guide sleeve for hydraulic drive, comprising a guide sleeve body of the hydraulic drive, a USH sealing ring, a first stepseal sealing ring and a second stepseal sealing ring, wherein the guide sleeve body is hollow on the inside and a first sealing groove, a second sealing groove and a third sealing groove are provided on the inside in sequence, and wherein the USH sealing ring is located in the first sealing groove, the first stepseal sealing ring is located in the second sealing groove and the second stepseal sealing ring is located in the third sealing groove.

[0006] Furthermore, the first sealing groove is located in the center of the guide sleeve body.

[0007] Furthermore, an annular oil groove is provided at one end of the guide sleeve body, wherein the annular oil groove is connected to an oil groove line, and wherein one end of the oil groove line is connected to the annular oil groove and wherein another end extends to the outside of the guide sleeve body.

[0008] Furthermore, the second sealing groove and the third sealing groove are located on both sides of the annular oil groove.

[0009] Furthermore, the second sealing groove and the third sealing groove have the same size.

[0010] Furthermore, the width of the first sealing groove is greater than the sum of the width of the second sealing groove and the width of the third sealing groove.

[0011] Furthermore, the USH sealing ring is made of polyurethane.

[0012] Furthermore, the guide sleeve body is designed for installation of the piston rod of the hydraulic drive, wherein the USH sealing ring, the first stepseal sealing ring and the second stepseal sealing ring are all connected to the piston rod via a press fit.

[0013] Furthermore, the edges of the first sealing groove, the second sealing groove and the third sealing groove are all rounded.

[0014] The utility model further relates to a hydraulic drive comprising the above-described sealing structure of a guide sleeve of the hydraulic drive.

[0015] Compared to the state of the art, the utility model has the following advantages: (1) The utility model modifies the sealing structure of the guide sleeve for hydraulic drives. In addition to the two original Stepseal seals, a USH seal ring is provided. The USH seal ring is typically made of polyurethane, which has high hardness and wear resistance and can withstand frequent friction without being easily damaged. Furthermore, the USH seal ring has good elasticity and resilience, and the USH seal fits tightly to the sealing surface, effectively preventing leakage. The USH seal provides reliable sealing performance not only in static sealing but also in dynamic sealing. (2) In the working environment of the hydraulic actuator, the internal oil must be effectively sealed. The two original seal rings have oil leakage, and there is a certain probability of oil loss. The three seal rings provide additional sealing protection, further improving the sealing performance of the sealing components, preventing oil leakage and seepage, and reducing oil loss in the system. In actual operation, the three-seal sealing system can maintain a better sealing effect under more severe working conditions (such as high temperature, high pressure, certain impurities in the oil, etc.) and can reduce oil leakage caused by poor sealing.Reducing leakage helps keep the oil pressure in the hydraulic actuator stable, ensuring the normal operation of the hydraulic motor and improving the reliability and stability of the entire system. (3) The utility model also optimizes the positions of the three seal rings. To solve the leakage problem of the annular oil groove, two step seal rings are arranged on both sides of the annular oil groove, thereby improving the sealing effect of the annular oil groove. The USH seal ring (2) is arranged in the center of the guide sleeve, and the thickness and width of the USH seal ring are increased to allow the USH seal ring to fit closely to the sealing surface. This achieves a tight seal on the body and prevents leakage. This achieves an overall better sealing effect. SHORT DESCRIPTION OF THE DRAWING Fig. 1 is a schematic diagram of a prior art guide sleeve structure for hydraulic drive; Fig. 2 is a schematic diagram of a sealing structure of a guide sleeve for hydraulic drive in an embodiment of the utility model;

[0016] In the drawings: 1. guide sleeve body, 2. USH sealing ring, 3. first stepseal sealing ring, 4. second stepseal sealing ring, 5. annular oil groove, 6. oil groove line. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the objectives, technical solutions, and advantages of the present utility model, the technical solutions in the embodiments of the present utility model are described clearly and completely below in conjunction with the drawings in the embodiments of the present utility model. It is obvious that the described embodiments represent only a portion of the embodiments of the present utility model, not all of them. The components of the embodiments of the present utility model described and illustrated in the attached drawings can be arranged and implemented in various configurations.

[0018] The detailed description of the embodiments of the present utility model in the accompanying drawings is therefore not intended to limit the scope of the claimed utility model, but rather to illustrate only selected embodiments of the present utility model. Based on the embodiments in this utility model, all other embodiments that a person skilled in the art could derive without creative effort fall within the scope of this utility model.

[0019] Please note that similar reference symbols and letters represent similar elements in the following drawings. Therefore, once a term is defined in one drawing, no further definition or explanation is required in subsequent drawings.

[0020] In the description of the present utility model, it should be noted that the terms “center”, “top”, “bottom”, “left”, “right”, “vertical”, “horizontal”, “inside”, “outside”, etc. indicate the directions or positions based on the drawings or indicate the common directions or positions in which the product of the present utility model is used, are only used to simplify the description of the present utility model and do not imply that the mentioned device or component must have a specific orientation or must be designed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model.

[0021] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be understood as an indication of the relative importance or number of technical features. Therefore, features marked "first," "second," etc., may explicitly or implicitly include one or more of these features. In the description of the present utility model, "several" means two or more, unless expressly stated otherwise.

[0022] Furthermore, terms like "horizontal" and "vertical" don't mean that the components are absolutely horizontal or vertically suspended, but can be slightly tilted. "Horizontal" simply suggests that the direction is more horizontal than "vertical." This doesn't mean the structure has to be completely horizontal; it can be slightly tilted. Example 1

[0023] As in Fig.As shown in Figure 2, this embodiment provides a sealing structure of a hydraulic drive guide sleeve, including a hydraulic drive guide sleeve body 1, a USH seal ring 2, a first step seal ring 3, and a second step seal ring 4. The guide sleeve body 1 is hollow on the inside, and a first seal groove, a second seal groove, and a third seal groove are provided sequentially on the inside. The USH seal ring 2 is located in the first seal groove, the first step seal ring 3 is located in the second seal groove, and the second step seal ring 4 is located in the third seal groove.

[0024] Preferably, an annular oil groove 5 is provided at one end of the guide sleeve body 1, and the annular oil groove 5 is connected to an oil groove line 6, wherein one end of the oil groove line 6 is connected to the annular oil groove 5 and another end of the oil groove line 6 extends to the outside of the guide sleeve body 1.

[0025] Preferably, the second sealing groove and the third sealing groove are each located on two sides of the annular oil groove 5. In order to solve the leakage problem of the annular oil groove, two step seal rings are provided on both sides of the annular oil groove to improve the sealing effect of the annular oil groove.

[0026] Preferably, the second sealing groove and the third sealing groove have the same size to ensure a balanced sealing effect on both sides of the annular oil groove 5.

[0027] Preferably, the first sealing groove is located in the center of the guide sleeve body 1, and the width of the first sealing groove is greater than the sum of the widths of the second sealing groove and the third sealing groove. This design places the USH sealing ring 2 in the center of the guide sleeve, and its thickness and width are increased to allow the USH sealing ring to fit tightly against the sealing surface. This seals the body, prevents leakage, and achieves an overall better sealing effect.

[0028] Polyurethane is the commonly used material for the USH sealing ring 2, which has high hardness and wear resistance, and can withstand frequent friction without being easily damaged. Furthermore, the USH ring has good elasticity and resilience, and the USH ring fits tightly to the sealing surface, effectively preventing leakage. The USH ring provides reliable sealing performance not only in static sealing but also in dynamic sealing.

[0029] The material of the sealing ring must be considered based on the working medium, temperature, pressure, and other factors. Selecting the sealing ring material suitable for the working conditions ensures that the sealing ring has good wear resistance, corrosion resistance, and sealing performance. The appropriate sealing ring specifications are selected based on the size and shape of the sealing location to ensure that the sealing ring fits tightly against the sealing surface and achieves a good sealing effect. At the same time, the installed sealing ring must not exhibit a tendency towards stick-slip movement to ensure the normal operation of the hydraulic drive.

[0030] The guide sleeve body 1 is used to install the piston rod of the hydraulic drive. Preferably, the USH seal ring 2, the first step seal ring 3, and the second step seal ring 4 are all connected to the piston rod by a press fit. This means that each seal ring can be compressed accordingly after assembly to ensure sealing performance.

[0031] Preferably, the edges of the first sealing groove, the second sealing groove and the third sealing groove are all rounded to prevent the edges of the sealing groove from being too sharp and damaging the sealing ring.

[0032] This embodiment also provides a hydraulic actuator comprising a sealing structure of a guide sleeve for hydraulic actuator as described above for mounting the piston rod in the corresponding guide sleeve.

[0033] The preferred concrete embodiments of the present utility model are described in detail above. It should be understood that those skilled in the art can make many modifications and changes in accordance with the concept of the present utility model without any creative effort. Therefore, all technical solutions that those skilled in the art can obtain through logical analysis, deduction, or limited experimentation based on the prior art in accordance with the concept of the present utility model fall within the scope of protection defined by the claims. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 210978044U

[0002]

Claims

[1] Sealing structure of a guide sleeve for hydraulic drive, characterized by in that the sealing structure comprises a guide sleeve body (1) of the hydraulic drive, a USH sealing ring (2), a first stepseal sealing ring (3) and a second stepseal sealing ring (4), wherein the guide sleeve body (1) is hollow on the inside and a first sealing groove, a second sealing groove and a third sealing groove are provided one after the other on the inside, and wherein the USH sealing ring (2) is located in the first sealing groove, the first stepseal sealing ring (3) is located in the second sealing groove and the second stepseal sealing ring (4) is located in the third sealing groove. [2] Sealing structure of a guide sleeve for hydraulic drive according to claim 1, characterized by that the first sealing groove is located in the center of the guide sleeve body (1). [3] Sealing structure of a guide sleeve for hydraulic drive according to claim 1, characterized bythat an annular oil groove (5) is provided at one end of the guide sleeve body (1), wherein the annular oil groove (5) is connected to an oil groove line (6), and wherein one end of the oil groove line (6) is connected to the annular oil groove (5) and wherein another end extends to the outside of the guide sleeve body (1). [4] Sealing structure of a guide sleeve for hydraulic drive according to claim 3, characterized by that the second sealing groove and the third sealing groove are located on both sides of the annular oil groove (5). [5] Sealing structure of a guide sleeve for hydraulic drive according to claim 4, characterized by that the second sealing groove and the third sealing groove have the same size. [6] Sealing structure of a guide sleeve for hydraulic drive according to claim 1, characterized bythat the width of the first sealing groove is greater than the sum of the width of the second sealing groove and the width of the third sealing groove. [7] Sealing structure of a guide sleeve for hydraulic drive according to claim 1, characterized by that the USH sealing ring (2) is made of polyurethane. [8] Sealing structure of a guide sleeve for hydraulic drive according to claim 1, characterized by that the guide sleeve body (1) is designed for installation of the piston rod of the hydraulic drive, wherein the USH sealing ring (2), the first stepseal sealing ring (3) and the second stepseal sealing ring (4) are all connected to the piston rod via a press fit. [9] Sealing structure of a guide sleeve for hydraulic drive according to claim 1, characterized by that the edges of the first sealing groove, the second sealing groove and the third sealing groove are all rounded. [10] Hydraulic drive, characterized bythat the hydraulic drive comprises a sealing structure of a guide sleeve for hydraulic drive according to one of claims 1 to 9.

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