Servo Motor Guide Sleeve Seal Structure and Servo Motor

Abstract

Provided are a guide sleeve seal structure and a servo motor for a servo motor, which ensure the normal operation of the servo motor and improve the reliability and stability of the entire system. 【Solution means】The guide sleeve seal structure includes a guide sleeve body 1, a USH seal ring 2, a first step seal 3, and a second step seal 4 of the servo motor. The inside of the guide sleeve body has a hollow structure, and a first seal groove, a second seal groove, and a third seal groove are sequentially provided therein. The USH seal ring is located in the first seal groove, the first step seal is located in the second seal groove, and the second step seal is located in the third seal groove. Compared with the prior art, the present invention can provide a highly reliable seal regardless of static seal or dynamic seal.

Description

Technical Field

[0001] The present invention relates to the field of seal structures of servo motors, and particularly to a guide sleeve seal structure and a servo motor of a servo motor.

Background Art

[0002] Conventional seal forms of servo motors mainly include static seals and dynamic seals. A static seal refers to a seal that prevents leakage of a medium when the seal position is in a relatively static state. A dynamic seal refers to a seal that prevents leakage of a medium when the seal position is in a relatively moving state. Currently, as shown in FIG. 1, the guide sleeve of a 660MW servo motor uses two stepped seals. Furthermore, the servo motor disclosed in the utility model with the publication number CN210978044U is provided with two stepped seals for sealing the guide sleeve. Specifically, it includes a housing and a piston rod fitted in the housing. A first mounting hole is provided at the first side end of the housing. The connection end of the piston rod extends from the first mounting hole and is coaxially connected to the valve stem. A first seal ring and a second seal 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 seal ring and the second seal ring.

[0003] The seal form of the guide sleeve of the above servo motor has the following defects.

[0004] The stepped seal can only be installed in a deformed state and cannot maintain its original sealing performance, and oil leakage and oil seepage may occur during operation.

Summary of the Invention

Means for Solving the Problems

[0005] The object of the present invention is to provide a guide sleeve seal structure and a servo motor for a servo motor, which overcome the drawbacks in the prior art that the guide sleeve of the servo motor is sealed only by two step seals, and the step seals can only be installed in a deformed state, unable to maintain the original sealing performance, resulting in oil leakage and oil seepage during operation.

[0006] The object of the present invention can be achieved by the following technical solutions.

[0007] A guide sleeve seal structure for a servo motor, comprising a guide sleeve body of the servo motor, a USH seal ring, a first step seal and a second step seal. The inside of the guide sleeve body is a hollow structure, which is provided with a first seal groove, a second seal groove, and a third seal groove in sequence. The USH seal ring is located in the first seal groove, the first step seal is located in the second seal groove, and the second step seal is located in the third seal groove.

[0008] Furthermore, the first seal 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 an oil groove pipeline is connected to the annular oil groove. One end of the oil groove pipeline is connected to the annular oil groove, and the other end penetrates to the outside of the guide sleeve body.

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

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

[0012] Furthermore, the width of the first seal groove is larger than the sum of the widths of the second seal groove and the third seal groove.

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

[0014] Furthermore, a piston rod of a servo motor is attached inside the guide sleeve body, and the USH seal ring, the first step seal, and the second step seal are all shrink-fitted onto the piston rod.

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

[0016] The present invention further provides a servo motor including the guide sleeve seal structure of the servo motor as described above.

[0017] Compared with the prior art, the present invention has the following advantages. (1) The present invention improves the seal structure of the guide sleeve of the servo motor. In addition to the original two step seals, a USH ring is added for sealing. The material commonly used for the USH ring is polyurethane, which has high hardness and wear resistance, can withstand frequent friction, and is not easily damaged. The USH ring has excellent elasticity and resilience, tightly adheres to the seal surface to effectively prevent leakage, and can provide a highly reliable seal regardless of static or dynamic sealing. (2) In the operating environment of the servo motor, it is necessary to effectively seal the internal oil. There is a certain possibility of oil leaching and oil leakage in the original two seal rings. The three seal rings are equivalent to adding one seal defense line, further improving the seal performance of the seal components, preventing oil leakage and leaching, and reducing oil loss in the system. In actual operation, the three-seal-ring system can maintain an excellent seal effect even under more severe operating conditions (such as high temperature, high pressure, and impurities in the oil), and can reduce the amount of oil leakage due to poor sealing. The reduction of leakage stabilizes the hydraulic pressure inside the servo motor, ensures the normal operation of the servo motor, and improves the reliability and stability of the entire system. (3) In this invention, the positions of the three seal rings are also optimized. Regarding the leakage problem of the annular oil groove, two stepped seals are arranged on both sides of the annular oil groove to improve the sealing effect of the annular oil groove. The USH seal ring (2) is arranged in the middle of the guide sleeve. By increasing the thickness and width, it adheres to the sealing surface, realizing the sealing and leakage prevention of the main body, and overall exerting an excellent sealing effect.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Explanation of Reference Signs

[0019] 1. Guide sleeve body, 2. USH seal ring, 3. First stepped seal, 4. Second stepped seal, 5. Annular oil groove, 6. Oil groove pipeline.

Modes for Carrying Out the Invention

[0020] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. The components of the embodiments of the present invention generally described and illustrated in the accompanying drawings may be arranged and designed in various different configurations.

[0021] 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 claimed present invention. Rather, it is intended to represent selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts are included within the protection scope of the present invention.

[0022] In the following figures, the same reference numerals and characters represent the same items. Therefore, once an item is defined in one figure, no further definition or explanation is required in subsequent figures.

[0023] Note that in the description of the present invention, the directions and positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the directions and positional relationships shown in the drawings or the directions and positional relationships in which the product of the present invention is usually placed when in use. This is only for the purpose of explaining and simplifying the present invention, and does not indicate or imply that the devices or elements mentioned must have a specific orientation and must be constructed and operate in a specific orientation. Therefore, this cannot be understood as a limitation of the present invention.

[0024] Note that the terms "first" and "second" are used only for convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the amount of technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality" means two or more unless otherwise clearly limited.

[0025] Also, terms such as "horizontal" and "vertical" do not mean that the member needs to be completely horizontal or suspended, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, and it may be slightly inclined.

Embodiment

[0026] As shown in Figure 2, this embodiment provides a guide sleeve seal structure for a servo motor. The guide sleeve seal structure includes a guide sleeve body 1 of the servo motor, a USH seal ring 2, a first step seal 3, and a second step seal 4. The inside of the guide sleeve body 1 has a hollow structure, and a first seal groove, a second seal groove, and a third seal groove are provided in sequence. The USH seal ring 2 is located in the first seal groove, the first step seal 3 is located in the second seal groove, and the second step seal 4 is located in the third seal groove.

[0027] Preferably, an annular oil groove 5 is provided at one end of the guide sleeve body 1. An oil groove pipeline 6 is connected to the annular oil groove 5. One end of the oil groove pipeline 6 is connected to the annular oil groove 5, and the other end penetrates to the outside of the guide sleeve body 1.

[0028] Preferably, the second seal groove and the third seal groove are respectively located on both sides of the annular oil groove 5. Regarding the leakage problem of the annular oil groove, two step seals are installed on both sides of the annular oil groove to improve the sealing effect of the annular oil groove.

[0029] Preferably, the second seal groove and the third seal groove have the same size to ensure a balanced sealing effect on both sides of the annular oil groove 5.

[0030] Preferably, the first seal groove is located in the middle of the guide sleeve body 1, and the width of the first seal groove is larger than the sum of the widths of the second seal groove and the third seal groove. That is, in this solution, the USH seal ring 2 is arranged in the middle of the guide sleeve, and by increasing the thickness and width, it adheres to the sealing surface to achieve the sealing and leakage prevention of the main body, and overall exhibits an excellent sealing effect.

[0031] The material commonly used for the USH seal ring 2 is polyurethane, which has high hardness and wear resistance, can withstand frequent friction, and is not easily damaged. The USH ring has excellent elasticity and resilience, can tightly adhere to the sealing surface to effectively prevent leakage, and can provide a highly reliable seal regardless of whether it is a static seal or a dynamic seal.

[0032] Regarding the material of each seal ring, considering factors such as the operating medium, temperature, pressure, etc., select a seal ring material suitable for the operating conditions to ensure that the wear resistance, corrosion resistance, and sealing performance of the seal ring are good. Select the appropriate specifications of the seal ring according to the size and shape of the sealing position to ensure that the seal ring tightly adheres to the sealing surface and a good sealing effect can be obtained. At the same time, in order to ensure the normal operation of the servo motor, the added seal ring should not tend to have a stick-slip motion.

[0033] Inside the guide sleeve body 1, the piston rod of the servo motor is installed. Preferably, the USH seal ring 2, the first step seal 3, and the second step seal 4 are all press-fitted onto the piston rod. That is, each seal ring can be properly compressed after installation to ensure the sealing performance.

[0034] Preferably, the edges of the first seal groove, the second seal groove, and the third seal groove are all rounded to avoid the edges of the seal groove being too sharp and damaging the seal ring.

[0035] This embodiment further provides a servo motor, which includes the guide sleeve seal structure of the servo motor as described above, and the piston rod is installed in the corresponding guide sleeve.

[0036] The preferred embodiments of the present invention have been described in detail above. It should be understood by those skilled in the art that many modifications and changes can be made based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art through logical analysis, inference, or limited experiments based on the concept of the present invention and based on the prior art should be within the scope of protection defined in the claims.

Claims

1. A guide sleeve seal structure for a servo motor, comprising a guide sleeve body (1) of the servo motor, a USH seal ring (2), a first step seal (3), and a second step seal (4), wherein the inside of the guide sleeve body (1) has a hollow structure, and a first seal groove, a second seal groove, and a third seal groove are sequentially provided therein. The USH seal ring (2) is located in the first seal groove, the first step seal (3) is located in the second seal groove, and the second step seal (4) is located in the third seal groove. A guide sleeve seal structure for a servo motor is characterized by this.

2. The servo motor guide sleeve seal structure according to claim 1, wherein the first seal groove is located in the middle of the guide sleeve body (1).

3. An annular oil groove (5) is provided at one end of the guide sleeve body (1), an oil groove pipeline (6) is connected to the annular oil groove (5), one end of the oil groove pipeline (6) is connected to the annular oil groove (5), and the other end penetrates to the outside of the guide sleeve body (1). The servo motor guide sleeve seal structure according to claim 1 is characterized by this.

4. The servo motor guide sleeve seal structure according to claim 3, wherein the second seal groove and the third seal groove are respectively located on both sides of the annular oil groove (5).

5. The servo motor guide sleeve seal structure according to claim 4, wherein the second seal groove and the third seal groove have the same size.

6. The servo motor guide sleeve seal structure according to claim 1, wherein the width of the first seal groove is larger than the sum of the widths of the second seal groove and the third seal groove.

7. The servo motor guide sleeve seal structure according to claim 1, wherein the USH seal ring (2) is made of polyurethane.

8. A piston rod of the servo motor is installed inside the guide sleeve body (1), and the USH seal ring (2), the first step seal (3), and the second step seal (4) are all interference-fitted onto the piston rod. The servo motor guide sleeve seal structure according to claim 1 is characterized by this.

9. The edge portions of the first seal groove, the second seal groove, and the third seal groove are all rounded, and the guide sleeve seal structure of the servomotor according to claim 1 is characterized thereby.

10. A servomotor, characterized by including the guide sleeve seal structure of the servomotor according to any one of claims 1 to 9.

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