Sealing assembly, sealing ring assembly, and power plant

Abstract

This invention discloses a sealing assembly, comprising: a bushing, a rotating shaft, a sealing seat, a sealing ring, and a deformation component; the rotating shaft is rotatably disposed within the bushing; the sealing seat is disposed on the outer periphery of the rotating shaft and adapted to rotate 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; the outer periphery of the sealing ring abuts against the inner wall of the bushing, and a portion of the sealing ring is received within the sealing groove, and a notch adapted to deform the sealing ring is formed on the sealing ring, the notch being adapted for fluid to pass through the sealing ring; the deformation component is disposed on the notch, and the deformation component is adapted to expand or contract according to the increase or decrease of temperature to adjust the size of the notch. The sealing assembly of this invention can reduce leakage and improve sealing effect by reducing the notch in the sealing ring under high-speed operating conditions.

Description

Technical Field

[0001] This invention relates to the field of rotary dynamic seals, and in particular to a sealing assembly, a sealing ring assembly, and a power device. Background Technology

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

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a sealing assembly that, during sealing, can adjust the size of the sealing ring notch to reduce leakage; simultaneously, it can utilize hydrodynamic pressure to tighten and limit the sealing ring under high-speed operating conditions, thereby improving the stability of the sealing ring.

[0004] This invention proposes a sealing assembly, which includes a bushing, a rotating shaft, a sealing seat, a sealing ring, and a deformation component. The rotating shaft is rotatably disposed within the bushing. The sealing seat is disposed on the outer periphery of the rotating shaft and adapted to rotate with the rotating shaft. 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 abuts 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 received within the sealing groove. A notch adapted to deform the sealing ring is formed on the sealing ring. The deformation component is disposed in the notch and is adapted to expand or contract according to the increase or decrease of temperature to adjust the size of the notch.

[0005] According to the sealing assembly of the present invention, since the deformable component is adapted to expand or contract according to the increase or decrease of temperature to adjust the size of the notch, the sealing assembly of the present invention can reduce leakage and improve sealing effect by reducing the notch of the sealing ring under high-speed operation.

[0006] According to some embodiments of this application, the deformable component is constructed as a shape memory alloy part.

[0007] According to some embodiments of this application, the sealing ring is provided with shape memory alloy parts at both ends of the notch, the shape memory alloy parts being adapted to extend or contract toward each other according to temperature changes.

[0008] According to some embodiments of this application, the shape memory alloy member located at one end of the notch has a protrusion extending toward the other end of the notch, and portions of the protrusions of the two shape memory alloy members overlap along the axial direction of the sealing ring.

[0009] According to some embodiments of this application, the sealing ring has a protruding boot bottom at at least one end in the axial direction, and the inner peripheral wall of the boot bottom and the inner peripheral wall of the sealing ring are located in the same arc surface.

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

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

[0012] According to some embodiments of this application, the sealing ring abuts against the first end face in the axial direction and the second end face in the axial direction 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] This application also proposes a sealing ring assembly, which includes a sealing ring and a deformation component, wherein the sealing ring and the deformation component are configured as any of the sealing ring and deformation components described above.

[0014] This application also proposes a power device, which includes any of the sealing components described above.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

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

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

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

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

[0021] Figure 5 This is a partial structural schematic diagram of the inner peripheral wall of the sealing ring according to some embodiments of this application.

[0022] Figure label:

[0023] Bushing 10; Rotating shaft 20; Sealing seat 30; Second end face 31;

[0024] Sealing ring 40; Notch 41; Boot bottom 42; First end face 43;

[0025] Deformation component (shape memory alloy part) 50; Protrusion 51;

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

[0027] First sealing gap 81; second sealing gap 82. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The following is for reference. Figures 1-5 A sealing assembly according to an embodiment of the present invention is described. The sealing assembly of the present invention can be applied to a variety of rotating turbine machinery such as aero-engines and gas turbines, and can be applied to a variety of technical fields such as nuclear power, aerospace, and petrochemicals.

[0030] This invention proposes a sealing assembly comprising: a bushing 10, a rotating shaft 20, a sealing seat 30, a sealing ring 40, and a deformation component 50; the rotating shaft 20 is rotatably disposed within the bushing 10; the sealing seat 30 is disposed on the outer periphery of the rotating shaft 20 and adapted to rotate 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 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 received within the sealing groove, and a notch 41 adapted to deform the sealing ring 40 is formed on the sealing ring 40; the deformation component 50 is disposed on the notch 41, and the deformation component 50 is adapted to expand or contract 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 this application can cause the sealing ring 40 to deform radially to expand or contract, thereby allowing the sealing ring 40 to be installed on the outer periphery of the sealing seat 30 or the inner wall of the bushing 10. However, due to the notch 41, the sealing ring 40 cannot achieve a complete seal, and there is fluid leakage at the notch 41.

[0032] According to the sealing assembly of the present application embodiment, 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 received in the sealing groove. Therefore, the sealing ring 40 can close the channel between the sealing seat 30 and the bushing 10. Further, a deformation member 50 is provided at the notch 41 of the sealing ring 40. The deformation member 50 can deform to elongate or contract according to temperature changes. After the deformation member 50 elongates, it can fill or cover at least a portion of the notch 41 to reduce the area of ​​the notch 41 and thus reduce leakage. When the deformation member 50 elongates and completely fills or covers the notch 41, a complete seal of the notch 41 can be achieved. The deformable component 50 of this application reduces the area of ​​the notch 41 or achieves complete sealing of the notch 41 according to the temperature change, which makes up for the defect that the sealing ring 40 cannot achieve sealing 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] Furthermore, since there is a temperature difference between the working and non-working states of the sealing assembly, the elongation or shortening of the deformable component 50 under different states can be controlled by utilizing the temperature difference. This can maintain the seal of the notch 41 by the deformable component 50 under working state, so that the sealing assembly under working state can achieve the required sealing performance.

[0034] According to the sealing assembly of this application, by providing a deformation member 50 at the notch 41 of the sealing ring 40, the deformation member 50 can deform according to temperature to close 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 this application, the deformable component 50 is constructed as a shape memory alloy component 50.

[0036] It should be noted that shape memory alloys are special alloys that can change shape under certain conditions and restore their original shape under other conditions. In this embodiment, the deformation component 50 is constructed as a shape memory alloy part 50, which can spontaneously deform under different temperature conditions without manual control or intervention, and can adapt to the closed environment of the sealing assembly; at the same time, the shape memory alloy part 50 has arbitrary shape and can be designed and processed in accordance with the shape of the sealing ring 40 and the notch 41, with low requirements for the installation environment, and can be applied to sealing rings 40 of different shapes and sizes.

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

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

[0039] According to some embodiments of this application, the sealing ring 40 is provided with shape memory alloy parts 50 at both ends of the notch 41, and the shape memory alloy parts 50 are adapted to extend or contract toward each other according to temperature changes. In this embodiment, as... Figure 2 As shown, two spaced-apart ends are formed in the notch 41 of the sealing ring 40, and each end is provided with a shape memory alloy component 50. The shape memory alloy component 50 can deform according to temperature changes to elongate or contract. After the deformed component 50 elongates, it can contact each other to seal the notch 41. In this embodiment, by providing two shape memory alloy components 50, the area of ​​the notch 41 can be reduced to a greater extent to reduce the leakage. At the same time, by utilizing the superposition of the deformation effects of the two shape memory alloy components 50, the requirement for the deformation capacity of a single shape memory alloy component 50 can be reduced.

[0040] According to some embodiments of this application, the shape memory alloy member 50 located at one end of the notch 41 has a protrusion 51 extending toward the other end of the notch 41, and portions of the protrusions 51 of the two shape memory alloy members 50 overlap along the axial direction of the sealing ring 40. In this embodiment, as... Figure 4 As shown, Figure 4 From the perspective of the outer peripheral surface of the sealing ring 40, two shape memory alloy parts 50 are respectively disposed at the two ends of the notch 41 of the sealing ring 40. The two shape memory alloy parts 50 are disposed opposite each other and each shape memory alloy part 50 is provided with protrusions 51 extending toward each other. When the sealing ring 40 is installed in the bushing 10, the protrusions 51 of the two shape memory alloy parts 50 are at least partially overlapped along the axial direction. In this embodiment, because the protrusions 51 of the two shape memory alloy parts 50 overlap, the notch 41 of the sealing ring 40 can be transformed into an overlap gap between the two shape 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 stretch or shorten toward each other when the temperature changes. When the deformable parts 50 stretch, at least part of the width of the overlap gap in the direction of fluid leakage narrows, which further reduces the leakage area and thus further improves the sealing effect of the sealing assembly.

[0041] It should also be noted that, due to the elastic force generated by the deformation of the sealing ring 40, its radial side is tightly pressed against the outer peripheral surface of the sealing seat 30 or the inner peripheral wall of the bushing 10 for installation. There is almost no interaction force between the sealing ring 40 and the sealing groove. Therefore, a sealing gap exists between the sealing ring 40 and the sealing groove, and the size of this gap is adjusted during the installation of the sealing ring 40. However, due to vibrations and other factors that may occur during high-speed operation of the sealing assembly, 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 sealing ring 40 and the sealing groove on their axially opposite surfaces, and a second sealing gap formed between the sealing ring 40 and the sealing groove on their radially opposite surfaces.

[0043] To address the aforementioned problems, according to some embodiments of this application, at least one end of the sealing ring 40 in the axial direction has a protruding boot bottom 42, the inner peripheral wall of the boot bottom 42 and the inner peripheral wall of the sealing ring 40 being 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 boot bottom 42, the facing area between the inner peripheral wall of the sealing ring 40 and the bottom wall of the sealing groove can be increased, thereby increasing the area where the fluid generates a dynamic pressure effect in the second sealing gap, thus 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. This embodiment, by increasing the radial dynamic pressure of the fluid on the sealing ring 40, can increase the force between the sealing ring 40 and the bushing 10, strengthen the tightening effect of the sealing ring 40, ensure the stability of the position of the sealing ring 40 in the working state, prevent the sealing gap from increasing, and thus ensure the sealing effect of the sealing assembly.

[0044] To address the aforementioned issues, according to some embodiments of this application, a dynamic pressure groove 70 is formed on the inner peripheral wall of the sealing ring 40 and / or the inner peripheral wall of the shoe bottom 42. It should be noted that for fluid flowing within the sealing gap, there will be a pressure drop along the flow direction. In this embodiment, by providing the dynamic pressure groove 70, a portion of the fluid can be accommodated, stabilizing the fluid pressure within a wider range. This reduces or stops the pressure drop, increases the sealing capacity, effectively improves the dynamic pressure effect between the inner peripheral wall of the sealing ring 40 and the bottom wall of the sealing groove, increases the dynamic pressure of the fluid on the inner peripheral wall of the sealing ring 40, 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. The second sealing gap can be configured 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 increasing, and thus 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 this application, the dynamic pressure groove 70 is constructed as a plurality of first grooves and a plurality of second grooves symmetrically arranged in the axial direction and spaced apart in the circumferential direction, wherein the first grooves and second grooves are inclined away from each other in a clockwise or counterclockwise direction. In this embodiment, as Figure 5 As shown, the first and second grooves are inclined away from each other in a clockwise or counterclockwise direction, and a sealing dam is formed between the first and second grooves. In this embodiment, the first groove is located upstream of the second sealing gap, and the second groove is located downstream of the second sealing gap. The sealing dam provides a certain degree of obstruction for the fluid, and the second groove provides a certain degree of push-back effect for the fluid. By setting the first and second grooves, this embodiment can generate a dynamic pressure effect, enabling the sealing assembly to achieve low or even zero leakage in a non-contact state at the end face of the second sealing gap. In addition, due to the pumping action of the dynamic pressure groove, a two-phase mixed fluid with a gas-liquid interface will be formed in the second sealing gap. By setting the first and second grooves, this embodiment can ensure that the gas-liquid interface is located near the sealing dam. When the operating speed of the sealing assembly varies over a wide range, the sealing assembly can always maintain a low or zero leakage state by adjusting the gas-liquid interface position. At the same time, the dynamic pressure effect of the dynamic pressure groove increases with the increase of the rotation speed, and the fluid generates greater pressure with the help of the sealing dam, thereby improving the sealing performance. This embodiment achieves low or zero leakage by setting the first and second grooves, while maintaining excellent sealing performance under high speed and different operating conditions.

[0047] According to some embodiments of this application, the sealing ring 40 has a first end face 43 in the axial direction abutting against the second end face 31 in the axial direction of the sealing groove, 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 near the sealing fluid side, and the first end face 43 in the axial direction of the sealing ring 40 abuts against the second end face 31 in the axial direction of the sealing groove to form the aforementioned first sealing gap 81. By providing a dynamic pressure groove, the friction between the first end face 43 and the second end face 31 can be reduced while ensuring sealing, thereby improving the performance of the sealing assembly. Furthermore, the dynamic pressure groove can also be configured as a combination of multiple grooves in clockwise and counterclockwise directions to improve the adaptability of the sealing assembly to different working conditions.

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

[0049] The present invention also proposes a sealing ring assembly.

[0050] The sealing ring assembly according to this application includes a sealing ring 40 and a deformation component 50, wherein the sealing ring 40 and the deformation component 50 are configured as described in any of the above embodiments. Because the sealing ring assembly of this application is provided with the sealing ring 40 and the deformation component 50 as described in any of the above embodiments, the sealing ring assembly has a good sealing effect, enabling the mechanical structure using the sealing ring assembly of this application to have a good service life and reliability.

[0051] The present invention also proposes a power device.

[0052] The power equipment according to this application includes any of the sealing components described above. Because the power equipment of this application is equipped with any of the sealing components described in the above embodiments, the power equipment has good sealing performance, good service life, and high reliability.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

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

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

[0056] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0057] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structural material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structural materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

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

Claims

1. A sealing assembly, characterized in that, include: bushing; A rotating shaft, which is rotatably disposed within the bushing; A sealing seat is disposed on the outer periphery of the rotating shaft and adapted to rotate 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 which abuts against the inner peripheral wall of the bushing or the outer peripheral surface of the sealing seat, and the other radial side of which is received in the sealing groove, and a notch is formed on the sealing ring to accommodate the change of the sealing ring. A deformable component is disposed at the notch, the deformable component being adapted to expand or contract in response to an increase or decrease in temperature to adjust the size of the notch.

2. The sealing assembly according to claim 1, characterized in that, The deformation component is constructed of shape memory alloy.

3. The sealing assembly according to claim 2, characterized in that, The sealing ring is provided with shape memory alloy parts at both ends of the notch, and the shape memory alloy parts are adapted to extend or contract toward each other according to temperature changes.

4. The sealing assembly according to claim 3, characterized in that, The shape memory alloy member located at one end of the notch has a protrusion extending toward the other end of the notch, and portions of the protrusions of the two shape memory alloy members overlap along the axial direction of the sealing ring.

5. The sealing assembly according to claim 1, characterized in that, The sealing ring has a protruding boot bottom at at least one end in the axial direction, and the inner peripheral wall of the boot bottom and the inner peripheral wall of the sealing ring are located in the same arc surface.

6. The sealing assembly according to claim 5, characterized in that, A dynamic pressure groove is formed on the inner peripheral wall of the sealing ring and / or the inner peripheral wall of the bottom of the boot.

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

8. The sealing assembly according to claim 6, characterized in that, The sealing ring abuts against the first end face in the axial direction and the second end face in the axial direction 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.

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

10. A power equipment, characterized in that, Includes the sealing assembly as described in any one of claims 1-8.

Images