Sealing structure and electric actuating mechanism
By designing annular protrusions on the outer wall of the sealing ring and fitting a spring, the problem of insufficient sealing performance at the rotating shaft of the electric actuator is solved, and effective sealing of lubricating oil is achieved, and leakage caused by thermal expansion and contraction is avoided.
Patent Information
- Application Number
- CN202421005846.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-10
AI Technical Summary
The conventional sealing ring between the rotating shaft of the electric actuator and the housing may easily lead to leakage of lubricant oil after thermal expansion and contraction, and cannot be effectively sealed.
A sealing structure is designed, the outer wall of the sealing ring has at least two annular protrusions, the outer diameter is increased in sequence, and is equipped with an annular or C-shaped clamping spring. The clamping spring applies elastic force between the sealing rings to tighten the sealing ring to prevent Lubricating oil leaks.
By increasing the tightening force during assembly and using the clamping effect of the spring, the sealing structure can effectively resist lubricant leakage caused by thermal expansion and contraction, achieving a leak-free sealing effect.
Smart Images
Figure CN222277488U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sealing structures, in particular to a sealing structure and an electric actuator. Background Art
[0002] The rotating shaft of the electric actuator rotates with the housing, one end of the rotating shaft extends out of the housing and is fixed with a handwheel, and the rotating shaft and the housing are usually sealed only with a conventional sealing ring.
[0003] However, the cross-section of a conventional sealing ring is a regular circle or rectangle. After the sealing ring expands and contracts due to heat and cold, the outer wall shrinks as a whole, causing the lubricating oil inside the electric actuator to leak from the outside of the sealing ring. Utility Model Content
[0004] The technical problem to be solved by the utility model is how to improve the sealing performance of the rotating shaft of the electric actuator.
[0005] The utility model provides a technical solution to the above technical problems as follows: a sealing structure, comprising a sealing ring, wherein the outer wall of the sealing ring has at least two annular protrusions, the annular protrusions are coaxially arranged with the sealing ring, at least two of the annular protrusions are axially spaced apart from each other along the sealing ring, and the outer diameters of the at least two annular protrusions increase sequentially.
[0006] The beneficial effects of the utility model are as follows: the outer diameters of at least two annular protrusions are increased successively, thereby increasing the tensioning force during assembly, and the interference fit between the annular protrusion with a larger diameter and the housing is larger, which resists leakage of lubricating oil inside the electric actuator from the outer diameter of the sealing ring due to thermal expansion and contraction, and the sealing structure meets the requirement of no leakage.
[0007] On the basis of the above technical solution, the present invention can also be improved as follows.
[0008] Furthermore, there are three annular protrusions, and the three annular protrusions are respectively a first protrusion, a second protrusion and a third protrusion.
[0009] The beneficial effect of adopting the above further solution is that: there are three annular protrusions, the structure is simple and the sealing effect is good.
[0010] Furthermore, the outer diameter of the first protrusion is b mm, the outer diameter of the second protrusion is c mm, and the outer diameter of the third protrusion is d mm, c=b+0.5 mm, d=c+0.5 mm.
[0011] Furthermore, the annular protrusion is annular with a triangular cross section.
[0012] Furthermore, it also includes a retaining spring, which is annular or C-shaped, and is clamped between two adjacent annular protrusions, and applies an elastic force radially inward to the sealing ring.
[0013] The beneficial effect of adopting the above further solution is that the retaining spring is used to tighten the sealing ring so that the sealing ring and the rotating shaft are tightly held to prevent the lubricating oil inside the electric actuator from leaking from the inner diameter of the sealing ring due to thermal expansion and contraction.
[0014] Furthermore, at least one clamping spring is provided between every two adjacent annular protrusions.
[0015] Furthermore, the cross section of the retaining spring is circular, and the cross section diameter of the retaining spring is 1 mm.
[0016] Furthermore, the center of the sealing ring has an axially arranged central through hole.
[0017] The beneficial effect of adopting the above further solution is that the sealing ring is sleeved on the rotating shaft through the central through hole.
[0018] Furthermore, the sealing ring is made of perfluoroether rubber, and the surface of the sealing ring has a perfluoropolyether grease layer.
[0019] The utility model also provides an electric actuator, comprising a housing, a rotating shaft and the sealing structure, wherein the rotating shaft is rotatably matched with the housing, and the sealing ring is sleeved on the outside of the rotating shaft and seals the gap between the rotating shaft and the housing.
[0020] The beneficial effect is that the sealing structure is used to achieve reliable sealing of the gap between the shell and the rotating shaft, and the lubricating oil in the shell will not leak. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a cross-sectional view of the sealing structure of the utility model, wherein φ represents the diameter.
[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0023] 1. First protrusion; 2. Second protrusion; 3. Third protrusion; 4. Circlip; 5. Center through hole. DETAILED DESCRIPTION
[0024] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0025] like Figure 1As shown, this embodiment provides a sealing structure, including a sealing ring, wherein the outer wall of the sealing ring has at least two annular protrusions, the annular protrusions are coaxially arranged with the sealing ring, at least two of the annular protrusions are axially spaced apart from each other along the sealing ring, and the outer diameters of at least two of the annular protrusions increase sequentially.
[0026] The outer diameters of at least two annular protrusions increase successively, thereby increasing the tension force during assembly. The annular protrusion with a larger diameter has a larger interference fit with the housing, which prevents the internal lubricating oil of the electric actuator from leaking from the outer diameter of the sealing ring due to thermal expansion and contraction, and the sealing structure meets the requirement of no leakage.
[0027] Optionally, there may be two, three or more annular protrusions.
[0028] Specifically, the plurality of annular protrusions are evenly distributed along the axial direction of the sealing ring.
[0029] Optionally, the cross-sectional shapes of the multiple annular protrusions are the same (eg Figure 1 As shown), or the cross-sectional shapes of multiple annular protrusions are different.
[0030] Based on any of the above solutions, there are three annular protrusions, which are respectively a first protrusion 1 , a second protrusion 2 and a third protrusion 3 .
[0031] There are three annular protrusions, which have a simple structure and good sealing effect.
[0032] Based on any of the above solutions, the outer diameter of the first protrusion 1 is b mm, the outer diameter of the second protrusion 2 is c mm, and the outer diameter of the third protrusion 3 is d mm, c=b+0.5mm, d=c+0.5mm.
[0033] Based on any of the above solutions, the annular protrusion is a ring with a triangular cross-section.
[0034] Based on any of the above solutions, the sealing structure further includes a retaining spring 4, which is annular or C-shaped, and is clamped between two adjacent annular protrusions and applies an elastic force radially inward to the sealing ring.
[0035] The retaining spring 4 is used to tighten the sealing ring so that the sealing ring and the rotating shaft are tightly held to prevent the lubricating oil inside the electric actuator from leaking from the inner diameter of the sealing ring due to thermal expansion and contraction.
[0036] On the basis of any of the above solutions, at least one clamping spring 4 is provided between every two adjacent annular protrusions.
[0037] Optionally, the number of the clamping springs 4 between each two adjacent annular protrusions is the same or different. When at least two clamping springs 4 are arranged between two adjacent annular protrusions, the at least two clamping springs 4 are arranged in sequence or at intervals along the axial direction of the sealing ring.
[0038] In one specific example, the number of the retaining springs 4 is one less than the number of the annular protrusions, and only one retaining spring 4 is disposed between every two adjacent annular protrusions.
[0039] Based on any of the above solutions, the cross section of the clamping spring 4 is circular, and the cross section diameter of the clamping spring 4 is 1 mm.
[0040] Alternatively, the cross section of the clamping spring 4 is polygonal or elliptical.
[0041] Based on any of the above solutions, the center of the sealing ring has an axially arranged central through hole 5.
[0042] The sealing ring is sleeved on the rotating shaft through the central through hole 5.
[0043] Specifically, the central through hole 5 is coaxially arranged with the sealing ring.
[0044] Based on any of the above solutions, the sealing ring is made of perfluoroether rubber, and the surface of the sealing ring has a perfluoropolyether grease layer.
[0045] Specifically, all outer surfaces of the sealing ring are coated with perfluoropolyether grease, especially the inner wall of the central through hole 5 and the outer wall of the sealing ring need to be in contact with the shaft and the housing, and grease needs to be applied to ensure the normal rotation of the shaft.
[0046] This embodiment also provides an electric actuator, including a housing, a rotating shaft and the sealing structure, wherein the rotating shaft is rotatably matched with the housing, and the sealing ring is sleeved on the outside of the rotating shaft and seals the gap between the rotating shaft and the housing.
[0047] The electric actuator adopts a sealing structure to achieve reliable sealing of the gap between the housing and the rotating shaft, and the lubricating oil in the housing will not leak.
[0048] In one specific example, the electric actuator is a ROTORK II generation product.
[0049] In the description of the present invention, it should be noted that the terms "axial", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0050] In addition, 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, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.
[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A sealing structure, characterized in that: It comprises a sealing ring, the outer wall of which has at least two annular protrusions, the annular protrusions are coaxially arranged with the sealing ring, the at least two annular protrusions are axially spaced apart from each other along the sealing ring, and the outer diameters of the at least two annular protrusions increase sequentially.
2. A sealing structure according to claim 1, characterized in that: There are three annular protrusions, which are respectively a first protrusion (1), a second protrusion (2) and a third protrusion (3).
3. A sealing structure according to claim 2, characterized in that: The outer diameter of the first protrusion (1) is b mm, the outer diameter of the second protrusion (2) is c mm, and the outer diameter of the third protrusion (3) is d mm, c=b+0.5 mm, d=c+0.5 mm.
4. A sealing structure according to claim 1, characterized in that: The annular protrusion is annular with a triangular cross section.
5. A sealing structure according to claim 1, characterized in that: It also comprises a clamping spring (4), which is annular or C-shaped, and is clamped between two adjacent annular protrusions, and applies an elastic force radially inward to the sealing ring.
6. A sealing structure according to claim 5, characterized in that: At least one clamping spring (4) is arranged between every two adjacent annular protrusions.
7. A sealing structure according to claim 5, characterized in that: The cross section of the clamping spring (4) is circular, and the cross section diameter of the clamping spring (4) is 1 mm.
8. A sealing structure according to any one of claims 1 to 7, characterized in that: The center of the sealing ring is provided with a central through hole (5) arranged axially.
9. A sealing structure according to any one of claims 1 to 7, characterized in that: The sealing ring is made of perfluoroether rubber, and the surface of the sealing ring is provided with a perfluoropolyether grease layer.
10. An electric actuator, characterized in that: It comprises a shell, a rotating shaft and a sealing structure as claimed in any one of claims 1 to 9, wherein the rotating shaft is rotatably matched with the shell, and the sealing ring is sleeved on the outside of the rotating shaft and seals the gap between the rotating shaft and the shell.