Guide sleeve sealing structure of hydraulic servo-motor and hydraulic servo-motor

Abstract

The guide sleeve sealing structure comprises a guide sleeve body of the hydraulic servo-motor, a USH sealing ring, a first step seal sealing ring and a second step seal sealing ring, the inner side of the guide sleeve body is of a hollow structure, and a first sealing groove, a second sealing groove and a third sealing groove are sequentially formed in the guide sleeve body; the USH sealing ring is located in the first sealing groove, the first step seal sealing ring is located in the second sealing groove, and the second step seal sealing ring is located in the third sealing groove. Compared with the prior art, reliable sealing can be provided no matter static sealing or dynamic sealing, so that normal work of the hydraulic servo-motor is guaranteed, and the reliability and stability of the whole system are improved.

Description

Technical Field

[0001] The invention relates to the field of oil motor sealing structures, in particular to a guide sleeve sealing structure of an oil motor and an oil motor. Background Art

[0002] The existing sealing forms of oil motors mainly include static seals and dynamic seals. Static seals refer to seals that prevent medium leakage when the sealing part is relatively static. Dynamic seals refer to seals that prevent medium leakage when the sealing part is in a relatively moving state. Figure 1 As shown, the guide sleeve of the gasoline engine on the 660MW is sealed with two step seals; in addition, as disclosed in the utility model with publication number CN210978044U, an oil motor is provided with two step seals to seal the guide sleeve, specifically comprising a shell and a piston rod sleeved in the shell, wherein: a first mounting hole is provided at the first side end of the shell; the connecting end of the piston rod extends out of the first mounting hole and is coaxially connected to the valve stem, and a first sealing ring and a second sealing ring 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 form of the above gasoline engine guide sleeve has the following defects:

[0004] The Step Seal can only be installed in a deformed state and cannot maintain its original sealing properties, which may result in oil leakage during operation. Summary of the invention

[0005] The purpose of the present invention is to provide a guide sleeve sealing structure and an oil motor for the oil motor in order to overcome the defect that the guide sleeve of the oil motor is sealed only by two step seals in the prior art, which can only be deformed for installation and cannot maintain the original sealing performance, resulting in oil leakage during operation.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A guide sleeve sealing structure of an oil motor comprises a guide sleeve body of the oil motor, a USH sealing ring, a first step seal sealing ring and a second step seal sealing ring, wherein the inner side of the guide sleeve body is a hollow structure and is provided with a first sealing groove, a second sealing groove and a third sealing groove in sequence, the USH sealing ring is located in the first sealing groove, the first step seal sealing ring is located in the second sealing groove, and the second step seal sealing ring is located in the third sealing groove.

[0008] Furthermore, the first sealing groove is located in the middle of the guide sleeve body.

[0009] Furthermore, an annular oil groove is provided at one end of the guide sleeve body, and the annular oil groove is connected to an oil groove pipeline, one end of the oil groove pipeline is connected to the annular oil groove, and the other end passes through to the outside of the guide sleeve body.

[0010] Furthermore, the second sealing groove and the third sealing groove are respectively located on both sides of the annular oil groove.

[0011] Furthermore, the second sealing groove and the third sealing groove have the same size.

[0012] Furthermore, 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.

[0013] Furthermore, the USH sealing ring is made of polyurethane.

[0014] Furthermore, the guide sleeve body is used to install a piston rod of the oil motor, and the USH sealing ring, the first step seal sealing ring and the second step seal sealing ring are all interference fit with the piston rod.

[0015] Furthermore, the edges of the first sealing groove, the second sealing groove and the third sealing groove are all rounded.

[0016] The present invention also provides an oil motor, comprising the guide sleeve sealing structure of the oil motor as described above.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] (1) The present invention transforms the guide sleeve sealing structure of the hydraulic motor, and installs a USH ring seal in addition to the original two-way Ster seal. The commonly used material of the USH ring is polyurethane, which has high hardness and wear resistance, and can withstand frequent friction without being easily damaged. In addition, the USH ring has good elasticity and resilience, can fit the sealing surface tightly, effectively prevent leakage, and can provide reliable sealing for both static and dynamic sealing.

[0019] (2) In the working environment of the hydraulic motor, the internal oil needs to be effectively sealed. The original two sealing rings have oil seepage and a certain probability of oil leakage. The three sealing rings are equivalent to adding a sealing line of defense, further increasing the sealing performance of the sealing component, preventing oil leakage and oil seepage, and reducing oil loss in the system. In actual operation, the three-ring 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.), reducing the amount of oil leakage caused by poor sealing. The reduction in leakage helps to maintain the stable pressure of the oil inside the hydraulic motor, thereby ensuring the normal operation of the hydraulic motor and improving the reliability and stability of the entire system.

[0020] (3) The present invention also optimizes the positions of the three sealing rings. To address the leakage problem of the annular oil groove, two step-seal sealing rings are arranged on both sides of the annular oil groove, thereby improving the sealing effect of the annular oil groove; the USH sealing ring (2) is arranged in the middle of the guide sleeve, and the thickness and width are increased to fit the sealing surface tightly, thereby achieving main body sealing and leakage prevention, and having a better sealing effect overall. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the guide sleeve structure of a hydraulic motor provided in the background technology of the present invention;

[0022] Figure 2 It is a schematic diagram of a guide sleeve sealing structure of an oil motor provided in an embodiment of the present invention;

[0023] In the figure, 1. guide sleeve body, 2. USH sealing ring, 3. first step seal ring, 4. second step seal ring, 5. annular oil groove, 6. oil groove pipeline. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] Example 1

[0031] like Figure 2 As shown, this embodiment provides a guide sleeve sealing structure of an oil motor, including a guide sleeve body 1 of the oil motor, a USH sealing ring 2, a first step seal ring 3 and a second step seal ring 4, the inner side of the guide sleeve body 1 is a hollow structure, and is provided with a first sealing groove, a second sealing groove and a third sealing groove in sequence, the USH sealing ring 2 is located in the first sealing groove, the first step seal ring 3 is located in the second sealing groove, and the second step seal ring 4 is located in the third sealing groove.

[0032] 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 pipeline 6 , one end of the oil groove pipeline 6 is connected to the annular oil groove 5 , and the other end passes through to the outside of the guide sleeve body 1 .

[0033] Preferably, the second sealing groove and the third sealing groove are respectively located on both sides of the annular oil groove 5. To solve the leakage problem of the annular oil groove, two step seal rings are arranged on both sides of the annular oil groove to improve the sealing effect of the annular oil groove;

[0034] Preferably, the second sealing groove and the third sealing groove have the same size to ensure balanced sealing effects on both sides of the annular oil groove 5 .

[0035] Preferably, the first sealing groove is located in the middle 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. That is, in this solution, the USH sealing ring 2 is arranged in the middle of the guide sleeve, and the thickness and width are increased to fit the sealing surface tightly, so as to achieve main body sealing and leakage prevention, and have a better sealing effect as a whole.

[0036] The commonly used material of USH sealing ring 2 is polyurethane, which has high hardness and wear resistance, and can withstand frequent friction without being easily damaged. In addition, the USH ring has good elasticity and resilience, can fit the sealing surface tightly, effectively prevent leakage, and can provide reliable sealing for both static and dynamic sealing.

[0037] For the materials of each seal ring, the working medium, temperature, pressure and other factors can be considered to select the seal ring material suitable for the working conditions to ensure that the seal ring has good wear resistance, corrosion resistance and sealing performance. According to the size and shape of the sealing part, select the appropriate seal ring specification to ensure that the seal ring can fit the sealing surface tightly to achieve a good sealing effect. At the same time, the installed seal ring should not have a tendency to stick-slip movement to ensure the normal operation of the oil motor.

[0038] The piston rod of the oil motor is installed in the guide sleeve body 1. Preferably, the USH seal ring 2, the first step seal ring 3 and the second step seal ring 4 are all interference fit with the piston rod, that is, each seal ring can have an appropriate amount of compression after installation to ensure the sealing performance.

[0039] Preferably, the edges of the first sealing groove, the second sealing groove and the third sealing groove are all rounded to avoid the edges of the sealing groove being too sharp to avoid damaging the sealing ring.

[0040] This embodiment also provides an oil motor, including a guide sleeve sealing structure of an oil motor as described above, so as to install the piston rod in the corresponding guide sleeve.

[0041] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A guide sleeve sealing structure of an oil motor, characterized in that: The invention comprises a guide sleeve body (1) of an oil motor, a USH sealing ring (2), a first step seal ring (3) and a second step seal ring (4); the inner side of the guide sleeve body (1) is a hollow structure and is provided with a first sealing groove, a second sealing groove and a third sealing groove in sequence; the USH sealing ring (2) is located in the first sealing groove, the first step seal ring (3) is located in the second sealing groove, and the second step seal ring (4) is located in the third sealing groove.

2. The guide sleeve sealing structure of a hydraulic motor according to claim 1, characterized in that: The first sealing groove is located in the middle of the guide sleeve body (1).

3. The guide sleeve sealing structure of a hydraulic motor according to claim 1, characterized in that: 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 pipeline (6). One end of the oil groove pipeline (6) is connected to the annular oil groove (5), and the other end passes through the outside of the guide sleeve body (1).

4. The guide sleeve sealing structure of a hydraulic motor according to claim 3, characterized in that: The second sealing groove and the third sealing groove are respectively located on two sides of the annular oil groove (5).

5. The guide sleeve sealing structure of a hydraulic motor according to claim 4, characterized in that: The second sealing groove and the third sealing groove have the same size.

6. The guide sleeve sealing structure of a hydraulic motor according to claim 1, characterized in that: 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.

7. The guide sleeve sealing structure of a hydraulic motor according to claim 1, characterized in that: The USH sealing ring (2) is made of polyurethane.

8. The guide sleeve sealing structure of a hydraulic motor according to claim 1, characterized in that: The guide sleeve body (1) is used to install the piston rod of the oil motor, and the USH sealing ring (2), the first step seal sealing ring (3) and the second step seal sealing ring (4) are all interference fit with the piston rod.

9. The guide sleeve sealing structure of a hydraulic motor according to claim 1, characterized in that: The edges of the first sealing groove, the second sealing groove and the third sealing groove are all rounded.

10. An oil motor, characterized in that: It comprises a guide sleeve sealing structure of an oil motor as described in any one of claims 1-9.

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