Sealing assembly, sealing ring assembly and power equipment

Abstract

The invention discloses a sealing assembly which comprises a lining, a rotating shaft, a sealing seat, a sealing ring and a deformation component. The rotating shaft is rotatably arranged in the bushing; the sealing seat is arranged on the periphery of the rotating shaft and suitable for rotating along with the rotating shaft, and a sealing groove is formed in the outer circumferential face of the sealing seat and / or the inner circumferential wall of the lining. The periphery of the sealing ring abuts against the inner wall of the lining, part of the sealing ring is contained in the sealing groove, a notch suitable for sealing ring deformation is formed in the sealing ring, and a notch suitable for fluid to pass through the sealing ring is formed in the notch; the deformation part is arranged in the notch and is suitable for stretching or contracting according to the rising or falling of the temperature so as to adjust the size of the notch. According to the sealing assembly, the leakage amount can be reduced by reducing the notches of the sealing rings in the high-rotating-speed working state, and the sealing effect is improved.

Description

Technical Field

[0001] The invention relates to the field of rotary dynamic seals, and in particular to a sealing component, a sealing ring component and a power device. Background Art

[0002] In the related technologies of expansion ring sealing, since the structure of the sealing ring itself has an opening, the sealing fluid contained in the sealing side will inevitably leak to the non-sealed side through the opening; and since the opening size of the sealing ring is relatively fixed, the leakage amount cannot be controlled and adjusted; in addition, due to problems such as vibration and posture change of the device, the sealing ring may be displaced, which increases the gap between the sealing ring and other structures, thereby increasing the leakage amount. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a sealing assembly that can adjust the size of the sealing ring gap to reduce leakage during sealing; and can use fluid dynamic pressure to clamp and limit the sealing ring under high-speed working conditions to improve the stability of the sealing ring.

[0004] The present invention proposes a sealing assembly. According to the present application, the sealing assembly includes a bushing, a rotating shaft, a sealing seat, a sealing ring and a deformation component; the rotating shaft is rotatably arranged in the bushing; the sealing seat is arranged on the outer periphery of the rotating shaft and is suitable for rotating with the rotating shaft, and a sealing groove is formed on the outer peripheral surface of the sealing seat and / or the inner peripheral wall of the bushing; one radial side of the sealing ring is stopped against the inner peripheral wall of the bushing or the outer peripheral surface of the sealing seat, and the other radial side of the sealing ring is accommodated in the sealing groove, and a notch suitable for the deformation of the sealing ring is formed on the sealing ring; the deformation component is arranged in the notch, and the deformation component is suitable for expanding or contracting according to the increase or decrease of temperature to adjust the size of the notch.

[0005] According to the sealing assembly of the embodiment of the present invention, since the deformable component is suitable for expanding or contracting to adjust the size of the gap according to the increase or decrease in temperature, the sealing assembly of the present invention can reduce leakage by reducing the gap of the sealing ring and improve the sealing effect under high-speed working conditions.

[0006] According to some embodiments of the present application, the deformation component is configured as a memory alloy part.

[0007] According to some embodiments of the present application, the sealing ring is provided with memory alloy pieces at both ends of the gap, respectively, and the memory alloy pieces are suitable for expanding or contracting toward each other according to temperature changes.

[0008] According to some embodiments of the present application, the memory alloy piece located at one end of the notch is formed with a convex portion extending toward the other end of the notch, and portions of the convex portions of the two memory alloy pieces overlap along the axial direction of the sealing ring.

[0009] According to some embodiments of the present application, a protruding shoe bottom is formed on at least one end of the sealing ring in the axial direction, and the inner circumferential wall of the shoe bottom and the inner circumferential wall of the sealing ring are located in the same arc surface.

[0010] According to some embodiments of the present application, dynamic pressure grooves are formed on the inner circumferential wall of the sealing ring and / or the inner circumferential wall of the shoe bottom.

[0011] According to some embodiments of the present application, the dynamic pressure groove is configured as a plurality of first grooves and a plurality of second grooves that are symmetrically arranged in the axial direction and spaced apart in the circumferential direction, and the first grooves and the second grooves are inclined away from each other in a clockwise or counterclockwise direction.

[0012] According to some embodiments of the present application, a first axial end face of the sealing ring abuts against a second axial end face of the sealing groove, and at least one of the first end face and the second end face is provided with a dynamic pressure groove.

[0013] The present application also proposes a sealing ring assembly. The sealing ring assembly according to the present application includes a sealing ring and a deformation component. The sealing ring and the deformation component are constructed as any one of the above-mentioned sealing rings and deformation components.

[0014] The present application also proposes a power device. The power device according to the present application includes any one of the above-mentioned sealing assemblies.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic structural diagram of an axial cross section of a sealing assembly according to some embodiments of the present application;

[0018] Figure 2 is a schematic structural diagram of a radial cross section of a sealing assembly according to some embodiments of the present application;

[0019] Figure 3 is a schematic structural diagram of a radial cross section of a sealing ring according to some embodiments of the present application;

[0020] Figure 4 is a schematic diagram of the matching state of two deformable components according to some embodiments of the present application;

[0021] Figure 5 It is a schematic diagram of the partial structure of the inner wall of the sealing ring according to some embodiments of the present application.

[0022] Reference numerals:

[0023] Bushing 10; rotating shaft 20; sealing seat 30; second end surface 31;

[0024] Sealing ring 40; notch 41; shoe bottom 42; first end surface 43;

[0025] Deformable component (memory alloy component) 50; convex portion 51;

[0026] Sealing ring 60; dynamic pressure groove 70;

[0027] A first sealing gap 81 ; a second sealing gap 82 . DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] Reference below Figure 1-Figure 5 The sealing assembly according to the embodiment of the present invention is described. The sealing assembly of the present invention can be applied to various rotating turbine machines such as various aircraft engines and gas turbines, and can be applied to various technical fields such as nuclear power, aerospace, and petrochemicals.

[0030] The present invention proposes a sealing assembly, which includes: a bushing 10, a rotating shaft 20, a sealing seat 30, a sealing ring 40 and a deformable component 50; the rotating shaft 20 is rotatably arranged in the bushing 10; the sealing seat 30 is arranged on the outer periphery of the rotating shaft 20 and is suitable for rotating with the rotating shaft 20, and a sealing groove is formed on the outer peripheral surface of the sealing seat 30 and / or the inner peripheral wall of the bushing 10; one radial side of the sealing ring 40 is stopped against the inner peripheral wall of the bushing 10 or the outer peripheral surface of the sealing seat 30, and the other radial side of the sealing ring 40 is accommodated in the sealing groove, and a notch 41 suitable for deformation of the sealing ring 40 is formed on the sealing ring 40; the deformable component 50 is arranged in the notch 41, and the deformable component 50 is suitable for expanding or contracting according to the increase or decrease of temperature to adjust the size of the notch 41.

[0031] It should be noted that the notch 41 provided on the sealing ring 40 in the present application can cause the sealing ring 40 to deform in the radial direction to achieve expansion or contraction, so that the sealing ring 40 can be installed on the outer periphery of the sealing seat 30 or the inner wall of the bushing 10, but the sealing ring 40 cannot achieve complete sealing due to the notch 41, and there is fluid leakage at the notch 41.

[0032] According to the sealing assembly of the embodiment of the present application, a sealing groove is formed on the outer peripheral surface of the sealing seat 30 and / or the inner peripheral wall of the bushing 10, one radial side of the sealing ring 40 abuts against the inner peripheral wall of the bushing 10 or the outer peripheral surface of the sealing seat 30, and the other radial side of the sealing ring 40 is accommodated in the sealing groove, so the sealing ring 40 can close the passage between the sealing seat 30 and the bushing 10. Further, a deformation component 50 is provided at the notch 41 of the sealing ring 40, and the deformation component 50 can be deformed to stretch or shrink according to the change of temperature. After the deformation component 50 is stretched, it can fill or cover at least part of the notch 41 to reduce the area of ​​the notch 41 and thus reduce leakage; when the deformation component 50 is stretched and the notch 41 is completely filled or covered, the notch 41 can be completely sealed. The deformable component 50 of the present application reduces the area of ​​the notch 41 or completely seals the notch 41 according to the change in temperature, thereby compensating for the defect that the sealing ring 40 cannot seal at the notch 41, making the sealing effect of the sealing ring 40 more comprehensive and improving the sealing performance of the sealing assembly.

[0033] In addition, since there is a temperature difference between the working temperature of the sealing component in the working state and the non-working state, the temperature difference is used to control the elongation or shortening of the deformable component 50 in different states, so that the sealing of the deformable component 50 to the notch 41 in the working state can be maintained, so that the sealing component in the working state can achieve the required sealing performance.

[0034] According to the sealing assembly of the present application, a deformable component 50 is provided at the notch 41 of the sealing ring 40. The deformable component 50 can be deformed according to temperature to achieve the closure of the notch 41, thereby improving the sealing effect of the sealing ring 40 and improving the leakage problem caused by the notch 41.

[0035] According to some embodiments of the present application, the deformation component 50 is configured as a memory alloy member 50 .

[0036] It should be noted that memory alloy refers to a special alloy that can change shape under certain conditions and restore its original shape under another condition. In this embodiment, the deformation component 50 is constructed as a memory alloy part 50, which can spontaneously deform under different temperature conditions, does not require manual control and intervention, and can adapt to the closed environment of the sealing component; at the same time, the shape of the memory alloy part 50 is arbitrary, and can be designed and processed according to the shape of the sealing ring 40 and the notch 41, with low requirements on the installation environment, and can be applied to sealing rings 40 of different shapes and sizes.

[0037] In some embodiments, the memory alloy can be constructed as nickel-titanium-based shape memory alloy, copper-based shape memory alloy, iron-based shape memory alloy and new nickel-titanium shape memory alloys such as titanium-nickel-copper, titanium-nickel-iron, titanium-nickel-chromium, as well as gold-cadmium, silver-cadmium and other alloy systems.

[0038] Furthermore, the memory alloy component 50 of this embodiment can have a two-way shape memory effect through memory training, elongating and deforming under higher temperature conditions and shortening and deforming under lower temperature conditions, so that the deformable component 50 has higher flexibility and can meet more sealing requirements and installation conditions.

[0039] According to some embodiments of the present application, the sealing ring 40 is provided with memory alloy pieces 50 at both ends of the notch 41, and the memory alloy pieces 50 are adapted to expand or contract toward each other according to temperature changes. Figure 2 As shown, two ends spaced apart from each other are formed in the notch 41 of the sealing ring 40, and both ends are provided with a memory alloy part 50, which can be deformed to extend or contract according to the change of temperature, and can contact each other after the deformation part 50 is extended to seal the notch 41. In this embodiment, by providing two memory alloy parts 50, the area of ​​the notch 41 can be reduced to a greater extent to reduce the leakage; at the same time, by superimposing the deformation effects of the two memory alloy parts 50, the requirements for the deformation capacity of a single memory alloy part 50 can be reduced.

[0040] According to some embodiments of the present application, the memory alloy member 50 located at one end of the notch 41 is formed with a convex portion 51 extending toward the other end of the notch 41, and portions of the convex portions 51 of the two memory alloy members 50 overlap along the axial direction of the sealing ring 40. Figure 4 As shown, Figure 4 From the perspective of the outer circumference of the sealing ring 40, two memory alloy parts 50 are respectively arranged at the two ends of the notch 41 of the sealing ring 40, the two memory alloy parts 50 are arranged opposite to each other and the two memory alloy parts 50 are provided with convex parts 51 extending toward each other, and when the sealing ring 40 is installed in the bushing 10, the convex parts 51 of the two memory alloy parts 50 at least partially maintain axial overlap. In the sealing assembly of this embodiment, since the convex parts 51 of the two memory alloy parts 50 overlap, the notch 41 of the sealing ring 40 can be changed into an overlap gap between the two memory alloy parts 50, which can reduce the size of the notch 41 and effectively reduce the leakage; at the same time, the deformable parts 50 extend or shorten toward each other when the temperature changes. When the deformable parts 50 extend, the width of at least part of the overlap gap in the fluid leakage direction becomes narrower, so that the leakage area can be further reduced, thereby further improving the sealing effect of the sealing assembly.

[0041] It should also be noted that, since the elastic force generated by the deformation of the sealing ring 40 causes one radial side of the sealing ring 40 to be closely attached to the outer peripheral surface of the sealing seat 30 or the inner peripheral wall of the bushing 10 to achieve installation, there is almost no interaction force between the sealing ring 40 and the sealing groove, so there will be a sealing gap between the sealing ring 40 and the sealing groove, and the size of the sealing gap is adjusted during the installation of the sealing ring 40. However, since the sealing assembly may vibrate when operating at high speed, the sealing ring 40 may move relative to the sealing groove, affecting the sealing gap and reducing the sealing effect of the sealing assembly.

[0042] The sealing gap between the sealing ring 40 and the sealing groove mainly includes a first sealing gap 81 formed between the axially opposite surfaces of the sealing ring 40 and the sealing groove, and a second sealing gap formed between the radially opposite surfaces of the sealing ring 40 and the sealing groove.

[0043] In view of the above problems, according to some embodiments of the present application, a protruding shoe bottom 42 is formed at at least one end of the sealing ring 40 in the axial direction, and the inner peripheral wall of the shoe bottom 42 and the inner peripheral wall of the sealing ring 40 are located in the same arc surface. In this embodiment, the outer peripheral surface of the sealing ring 40 abuts against the inner peripheral wall of the bushing 10, and the second sealing gap is formed between the inner peripheral wall of the sealing ring 40 and the bottom wall of the sealing groove. By providing the shoe bottom 42, the facing area of ​​the inner peripheral wall of the sealing ring 40 and the bottom wall of the sealing groove can be increased, and the area where the fluid generates a dynamic pressure effect in the second sealing gap can be increased, thereby enhancing the dynamic pressure effect of the fluid in the second sealing gap and increasing the dynamic pressure of the fluid on the inner peripheral wall of the sealing ring 40. In this embodiment, by increasing the dynamic pressure of the fluid on the sealing ring 40 in the radial direction, the force between the sealing ring 40 and the bushing 10 can be increased, the tightening effect of the sealing ring 40 can be strengthened, the stability of the position of the sealing ring 40 in the working state can be ensured, and the sealing gap can be prevented from becoming larger, thereby ensuring the sealing effect of the sealing assembly.

[0044] In view of the above problems, according to some embodiments of the present application, a dynamic pressure groove 70 is formed on the inner circumferential wall of the sealing ring 40 and / or the inner circumferential wall of the shoe bottom 42. It should be noted that for the fluid flowing in the sealing gap, there will be a pressure drop along the flow direction. In this embodiment, by providing the dynamic pressure groove 70, part of the fluid can be accommodated, so that the pressure of the fluid is stabilized in a wider range, the pressure drop can be slowed down or stopped, the bearing capacity of the seal is increased, and the dynamic pressure effect between the inner circumferential wall of the sealing ring 40 and the bottom wall of the sealing groove can be effectively improved, and the dynamic pressure of the fluid on the inner circumferential wall of the sealing ring 40 is increased, thereby strengthening the tightening effect of the sealing ring 40, improving the stability of the sealing ring 40, and enhancing the sealing effect of the sealing assembly.

[0045] In some embodiments, the inner peripheral wall of the sealing ring 40 abuts against the outer peripheral surface of the sealing seat 30, and the second sealing gap can be constructed to be formed between the outer peripheral surface of the sealing ring 40 and the bottom wall of the sealing groove. The outer peripheral surface of the shoe bottom 42 and the outer peripheral surface of the sealing ring 40 are located in the same arc surface to increase the facing area between the outer peripheral surface of the sealing ring 40 and the bottom wall of the sealing groove, thereby increasing the dynamic pressure of the fluid on the outer peripheral surface of the sealing ring 40, so that the sealing ring 40 is clamped on the sealing seat 30, ensuring the stability of the position of the sealing ring 40 in the working state, preventing the sealing gap from becoming larger, and thereby improving the sealing effect of the sealing assembly. Further, the dynamic pressure groove 70 is provided on the outer peripheral surface of the shoe bottom 42 and / or the outer peripheral surface of the sealing ring 40.

[0046] According to some embodiments of the present application, the dynamic pressure groove 70 is configured as a plurality of first grooves and a plurality of second grooves that are symmetrically arranged in the axial direction and spaced apart in the circumferential direction, and the first grooves and the second grooves are arranged to be inclined away from each other in the clockwise direction or the counterclockwise direction. Figure 5 As shown, the first groove and the second groove are arranged to be inclined away from each other in the clockwise direction or the counterclockwise direction, and a sealing dam is formed between the first groove and the second groove. In this embodiment, the first groove is located on the upstream side of the second sealing gap, and the second groove is located on the downstream side of the second sealing gap. The sealing dam plays a certain blocking role for the fluid, and the second groove can play a certain pushing role for the fluid. In this embodiment, by setting the first groove and the second groove, a dynamic pressure effect can be generated so that the sealing component can achieve low leakage or even zero leakage in a state where the end surface of the second sealing gap is non-contact. In addition, due to the pumping effect of the dynamic pressure groove, the second sealing gap will form a two-phase mixed fluid with a gas-liquid interface. In this embodiment, by setting the first groove and the second groove, it can ensure that the gas-liquid interface is located near the sealing dam. When the working speed of the sealing component changes in a large range, the sealing component can always maintain a low leakage or zero leakage state by adjusting the gas-liquid boundary position; at the same time, the dynamic pressure effect of the dynamic pressure groove increases with the increase of the speed, and the fluid will generate greater pressure with the help of the sealing dam, thereby improving the sealing performance. This embodiment can achieve low leakage or zero leakage due to the provision of the first groove and the second groove, while maintaining excellent sealing performance under high rotation speed and different working conditions.

[0047] According to some embodiments of the present application, the first end face 43 of the sealing ring 40 in the axial direction abuts against the second end face 31 of the sealing groove in the axial direction, and at least one of the first end face 43 and the second end face 31 is provided with a dynamic pressure groove. In this embodiment, the first end face 43 is configured as the axial end face of the sealing ring 40 close to the sealing fluid side, and the first end face 43 of the sealing ring 40 in the axial direction abuts against the second end face 31 of the sealing groove in the axial direction to form the above-mentioned first sealing gap 81. By providing the dynamic pressure groove, the friction between the first end face 43 and the second end face 31 can be reduced while ensuring the seal, thereby improving the performance of the sealing assembly. Furthermore, the dynamic pressure groove can also be configured as a combination of multiple grooves in the clockwise and counterclockwise directions to improve the adaptability of the sealing assembly to different working conditions.

[0048] According to some embodiments of the present application, a sealing ring 60 is provided between the sealing seat 30 and the rotating shaft 20. In this embodiment, the sealing ring 60 closes the gap between the sealing seat 30 and the rotating shaft 20 to improve the sealing effect of the sealing assembly.

[0049] The invention also provides a sealing ring assembly.

[0050] The sealing ring assembly according to the present application includes: a sealing ring 40 and a deformable component 50, and the sealing ring 40 and the deformable component 50 are configured as any of the above-mentioned sealing rings 40 and deformable components 50. Since the sealing ring assembly of the present application is provided with the sealing ring 40 and the deformable component 50 described in any of the above-mentioned embodiments, the sealing ring assembly has a good sealing effect, so that the mechanical structure using the sealing ring assembly of the present application has a good service life and reliability.

[0051] The invention also provides a power device.

[0052] The power equipment according to the present application includes any one of the above-mentioned sealing assemblies. Since the power equipment according to the present application is provided with the sealing assembly described in any one of the above-mentioned embodiments, the power equipment has good sealing performance, good service life and reliability.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0055] In the description of the present invention, "plurality" means two or more.

[0056] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0057] In the description of the present invention, “on”, “above” and “over” a first feature from a second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific characteristic structure materials or features described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific characteristic structure materials or features described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A sealing assembly, characterized in that: include: bushing; a rotating shaft, the rotating shaft being rotatably disposed in the bushing; A sealing seat, the sealing seat is arranged on the outer periphery of the rotating shaft and is suitable for rotating with the rotating shaft, and a sealing groove is formed on the outer peripheral surface of the sealing seat and / or the inner peripheral wall of the bushing; A sealing ring, one radial side of the sealing ring abuts against the inner peripheral wall of the bushing or the outer peripheral surface of the sealing seat, the other radial side of the sealing ring is accommodated in the sealing groove, and a notch suitable for the sealing ring is formed on the sealing ring; A deformation component is arranged at the notch, and the deformation component is suitable for expanding or contracting according to the increase or decrease of temperature to adjust the size of the notch.

2. The sealing assembly according to claim 1, characterized in that: The deformation component is configured as a memory alloy piece.

3. The sealing assembly according to claim 2, characterized in that: The sealing ring is provided with the memory alloy pieces at both ends of the notch, respectively, and the memory alloy pieces are suitable for expanding or contracting toward each other according to temperature changes.

4. The sealing assembly according to claim 3, characterized in that: The memory alloy piece located at one end of the notch is formed with a convex portion extending toward the other end of the notch, and portions of the convex portions of the two memory alloy pieces are overlapped along the axial direction of the sealing ring.

5. The sealing assembly according to claim 1, characterized in that: A protruding shoe bottom is formed at at least one end of the sealing ring in the axial direction, and the inner circumferential wall of the shoe bottom and the inner circumferential wall of the sealing ring are located in the same arc surface.

6. The sealing assembly according to claim 5, characterized in that Dynamic pressure grooves are formed on the inner peripheral wall of the sealing ring and / or the inner peripheral wall of the shoe bottom.

7. The sealing assembly according to claim 6, characterized in that: The dynamic pressure grooves are configured as a plurality of first grooves and a plurality of second grooves that are symmetrically arranged in the axial direction and spaced apart in the circumferential direction, and the first grooves and the second grooves are inclined away from each other in a clockwise direction or a counterclockwise direction.

8. The sealing assembly according to claim 6, characterized in that A first end surface of the sealing ring in the axial direction abuts against a second end surface of the sealing groove in the axial direction, and at least one of the first end surface and the second end surface is provided with a dynamic pressure groove.

9. A sealing ring assembly, characterized in that: include: A sealing ring and a deformable component, wherein the sealing ring and the deformable component are constructed as the sealing ring and the deformable component as described in any one of claims 1 to 8.

10. A power device, characterized in that: A sealing assembly comprising any one of claims 1-8.

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