Brush type sealing structure with movable pressing ring

Abstract

The utility model discloses a brush type sealing structure with a movable pressing ring. The brush type sealing structure with the movable pressing ring comprises a front plate, a rear plate and a sealing ring, the back plate is positioned behind the front plate; the brush wire bundle is clamped between the front plate and the back plate; the movable pressing ring comprises a radial part and an axial part, the radial part extends in the radial direction of the movable pressing ring, the axial part extends in the axial direction of the movable pressing ring from the radial part, and the rear end face of the radial part abuts against the brush wire bundle; and the elastic piece is respectively propped against the front end surface of the radial part and the front plate. The brush type sealing structure with the movable pressing ring has the advantages of being good in sealing effect, long in service life and the like.

Description

Technical Field

[0001] This utility model relates to the field of dynamic sealing technology, and more specifically, to a brush seal structure with a movable pressure ring. Background Technology

[0002] Brush seals reduce air leakage by using flexible brush filaments that adhere to the rotor surface. They are used in turbine machinery such as aircraft engines, gas turbines, and steam turbines. Compared to labyrinth seals, brush seals offer superior sealing performance.

[0003] In related technologies, brush seal structures are prone to brush bristle vibration under airflow, a phenomenon known as "flutter." This phenomenon not only reduces the sealing performance of the brush seal structure, leading to increased leakage, but also reduces its service life. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a brush seal structure with a movable pressure ring, which has advantages such as good sealing effect and long service life.

[0005] To achieve the above objectives, an embodiment of this utility model proposes a brush seal structure with a movable pressure ring. The brush seal structure with a movable pressure ring includes: a front plate; a back plate located behind the front plate; a bristle bundle sandwiched between the front plate and the back plate; a movable pressure ring including a radial portion and an axial portion, the radial portion extending radially along the movable pressure ring, and the axial portion extending axially from the radial portion toward the movable pressure ring, the rear end face of the radial portion abutting against the bristle bundle; and an elastic member abutting against the front end face of the radial portion and the front plate respectively.

[0006] The brush-type sealing structure with a movable pressure ring according to the embodiments of this utility model has the advantages of good sealing effect and long service life.

[0007] In addition, the brush seal structure with a movable pressure ring according to the above embodiments of the present invention may also have the following additional technical features:

[0008] According to one embodiment of the present invention, a mounting groove is provided on the front plate, and the inner circumferential surface of the axial portion abuts against the radial inner surface of the mounting groove.

[0009] According to one embodiment of the present invention, the rear surface of the movable pressure ring is constructed as an arc-shaped surface that bulges rearward from the radial center compared to the radial inner and outer edges.

[0010] According to one embodiment of the present invention, the connection between the rear surface and the inner circumferential surface of the movable pressure ring and the connection between the rear surface and the outer circumferential surface are rounded.

[0011] According to one embodiment of the present invention, the elastic element is annular and extends radially inward from front to back. The elastic element is provided with a plurality of elastic notches spaced apart along the circumference of the elastic element, and the elastic notches are connected to the front edge or the rear edge of the elastic element.

[0012] According to one embodiment of the present invention, the elastic element is a wave spring or a helical spring.

[0013] According to one embodiment of the present invention, the elastic elements are multiple and are spaced apart along the circumference of the movable pressure ring.

[0014] According to one embodiment of the present invention, the front surface of the back plate is provided with a groove.

[0015] According to one embodiment of the present invention, the rear surface of the movable pressure ring is provided with a self-lubricating coating.

[0016] According to one embodiment of the present invention, the elastic element is a sheet metal bending element with a sheet metal thickness of 0.2-1 mm.

[0017] Additional aspects and advantages of this 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

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a cross-sectional view of a brush seal structure with a movable pressure ring according to a specific embodiment of the present invention.

[0020] Figure 2 This is a partial cross-sectional view of a brush seal structure with a movable pressure ring according to a specific embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the elastic element of a brush-type sealing structure with a movable pressure ring according to a specific embodiment of the present invention.

[0022] Figure 4 This is a partial cross-sectional view of a brush seal structure with a movable pressure ring according to another specific embodiment of the present invention.

[0023] Figure 5This is a schematic diagram of the elastic element of a brush-type sealing structure with a movable pressure ring according to another specific embodiment of the present invention.

[0024] Figure 6 This is a partial cross-sectional view of a brush seal structure with a movable pressure ring according to another specific embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the elastic element of a brush-type sealing structure with a movable pressure ring according to another specific embodiment of the present invention.

[0026] Figure 8 This is a partial cross-sectional view of a brush seal structure with a movable pressure ring according to another specific embodiment of the present invention.

[0027] Figure 9 This is a schematic diagram of the elastic element of a brush-type sealing structure with a movable pressure ring according to another specific embodiment of the present invention.

[0028] Figure 10 This is a partial cross-sectional view of a brush seal structure with a movable pressure ring according to another specific embodiment of the present invention.

[0029] Figure 11 This is a schematic diagram of the movable pressure ring and elastic element of a brush seal structure with a movable pressure ring according to another specific embodiment of the present invention.

[0030] Figure 12 This is a schematic diagram of the elastic element of a brush-type sealing structure with a movable pressure ring according to another specific embodiment of the present invention.

[0031] Reference numerals: 1. Brush seal structure with movable pressure ring; 10. Front plate; 11. Mounting groove; 20. Back plate; 21. Groove; 30. Brush filament bundle; 40. Elastic element; 41. Elastic notch; 50. Movable pressure ring. Detailed Implementation

[0032] This application is based on the inventor's discoveries and understanding of the following facts and problems:

[0033] Brush seals reduce air leakage by using flexible brush filaments that adhere to the rotor surface. They are used in turbine machinery such as aircraft engines, gas turbines, and steam turbines. Compared to labyrinth seals, brush seals offer superior sealing performance.

[0034] In related technologies, brush seal structures are prone to brush bristle vibration under airflow, a phenomenon known as "flutter." This phenomenon not only reduces the sealing performance of the brush seal structure, leading to increased leakage, but also reduces its service life.

[0035] Specifically, some brush seal structures in related technologies use a pressure ring, which is driven by an elastic element or airflow to provide clamping force to the brush filament bundle to suppress the fluttering phenomenon. However, the inventors of this application have found through extensive research that such solutions easily lead to rapid wear of the brush filament bundle, reducing the service life of the brush seal structure.

[0036] The inventors of this application further discovered that the brush seal structure using a pressure ring to provide clamping force in the related technology causes wear because, during operation, in addition to generating clamping force on the brush filament bundle in the axial direction, the pressure ring is also prone to relative displacement with the brush filament bundle in the radial direction, resulting in frequent friction between the pressure ring and the brush filament bundle, which accelerates the wear of the brush seal structure.

[0037] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] The following description, with reference to the accompanying drawings, describes a brush seal structure 1 with a movable pressure ring according to an embodiment of the present invention.

[0041] like Figures 1-12 As shown, the brush sealing structure 1 with a movable pressure ring according to an embodiment of the present invention includes a front plate 10, a back plate 20, a brush bristle bundle 30, a movable pressure ring 50, and an elastic element 40.

[0042] The back plate 20 is located behind the front plate 10 (as indicated by the arrows in the figure in the front-to-back and inside-out directions). The bristle bundle 30 is held between the front plate 10 and the back plate 20. The movable pressure ring 50 includes a radial portion and an axial portion. The radial portion extends radially along the movable pressure ring 50, and the axial portion extends axially from the radial portion toward the front edge of the movable pressure ring 50. The rear end face of the radial portion abuts against the bristle bundle 30. The elastic member 40 abuts against the front end face of the radial portion and the front plate 10, respectively.

[0043] Specifically, the cross-section of the movable pressure ring 50 perpendicular to the circumferential direction is generally L-shaped.

[0044] The fluid flows from front to back, with the front plate 10 in front of the high-pressure side and the back plate 20 in front of the low-pressure side.

[0045] According to the embodiment of the present invention, the brush seal structure 1 with a movable pressure ring is provided with a movable pressure ring 50 and an elastic element 40. The elastic element 40 abuts against the front plate 10 and the movable pressure ring 50 respectively, and the movable pressure ring 50 abuts against the brush filament bundle 30. The elastic element 40 and the movable pressure ring 50 can provide a clamping force to the brush filament bundle 30, suppress the fluttering phenomenon of the brush filament bundle 30, prevent the brush filament bundle 30 from vibrating under the action of airflow and affecting the sealing performance, reduce leakage, reduce wear caused by the vibration of the brush filament bundle 30, and extend the service life of the brush seal structure 1 with a movable pressure ring.

[0046] Furthermore, by including a radial portion and an axial portion in the movable pressure ring 50, not only can the axial force be transmitted using the radial portion, allowing the force of the elastic element 40 to be transmitted to the brush bristle bundle 30, but the radial portion can also be used to limit the movable pressure ring 50 itself and the space between the movable pressure ring 50 and the elastic element 40, restricting the radial displacement of the movable pressure ring 50, alleviating the relative radial displacement between the movable pressure ring 50 and the brush bristle bundle 30, and avoiding frequent friction between the movable pressure ring 50 and the brush bristle bundle 30. This can prevent the movable pressure ring 50 and the brush bristle bundle 30 from being frequently subjected to friction and thus wear down quickly, thereby reducing the wear rate of the brush bristle bundle 30 and improving the service life of the brush seal structure 1 with the movable pressure ring.

[0047] In addition, by setting a movable pressure ring 50, the elastic element 40 can indirectly provide clamping force to the bristle bundle 30 through the movable pressure ring 50, which can reduce the structural restrictions on the elastic element 40, increase the range of options for the elastic element 40, make the selection of the elastic element 40 more diversified, reduce the manufacturing and design difficulty of the elastic element 40, and facilitate the achievement of the best clamping effect.

[0048] Therefore, the brush sealing structure 1 with a movable pressure ring according to the present invention has the advantages of good sealing effect and long service life.

[0049] The following description, with reference to the accompanying drawings, describes a brush seal structure 1 with a movable pressure ring according to a specific embodiment of the present invention.

[0050] In some specific embodiments of this utility model, such as Figures 1-12 As shown, the brush sealing structure 1 with a movable pressure ring according to an embodiment of the present invention includes a front plate 10, a back plate 20, a brush bristle bundle 30, a movable pressure ring 50, and an elastic element 40.

[0051] Specifically, such as Figure 2 , Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, the front plate 10 is provided with a mounting groove 11, and the inner circumferential surface of the axial portion abuts against the radially inner surface of the mounting groove 11. Specifically, the elastic element 40 can abut against the outer circumferential surface of the axial portion. In this way, the abutment between the axial portion and the mounting groove 11 can limit the radial displacement of the movable pressure ring 50, thereby limiting the radial relative movement between the movable pressure ring 50 and the brush filament bundle 30, preventing the movable pressure ring 50 and the brush filament bundle 30 from being frequently rubbed and worn quickly, thereby reducing the wear rate of the brush filament bundle 30 and improving the service life of the brush seal structure 1 with the movable pressure ring.

[0052] Advantageously, such as Figure 2 , Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, the rear surface of the movable pressure ring 50 is constructed as an arc-shaped surface that bulges rearward from the radial center compared to the radial inner and outer edges. This reduces the contact area between the movable pressure ring 50 and the brush bristle bundle 30, thereby reducing the friction between the brush bristle bundle 30 and the movable pressure ring 50, reducing the wear rate between the brush bristle bundle 30 and the movable pressure ring 50, and further extending the service life of the brush seal structure 1 with the movable pressure ring.

[0053] More advantageously, such as Figure 2 , Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, the joints between the rear surface and the inner circumferential surface of the movable pressure ring 50, as well as the joints between the rear surface and the outer circumferential surface, are rounded. This further reduces the wear rate between the brush bristle bundle 30 and the movable pressure ring 50, and further extends the service life of the brush seal structure 1 with the movable pressure ring.

[0054] In some embodiments, such as Figures 1-5As shown, the elastic element 40 is annular and extends radially inward from front to back. The elastic element 40 has multiple elastic notches 41 spaced apart circumferentially along its circumference, and these notches 41 communicate with the front or rear edge of the elastic element 40. Specifically, Figures 1-3 An embodiment is shown in which the elastic notch 41 is connected to the leading edge of the elastic member 40. Figure 4 and Figure 5 An embodiment is shown in which the elastic notch 41 communicates with the rear edge of the elastic member 40. By providing multiple elastic notches 41 on the elastic member 40, the flexibility of the elastic member 40 can be improved, making it easier for the elastic member 40 to undergo elastic deformation. Compared with the brush-type sealing structure in the related art, the elastic member 40 can still undergo sufficient elastic deformation when the amplitude of the brush filament bundle 30 is small, so that the elastic member 40 can fully adapt to the vibration of the brush filament bundle 30 and avoid excessive clamping force leading to increased wear rate.

[0055] In other embodiments, such as Figure 6 and Figure 7 As shown, the elastic element 40 is a wave spring. This facilitates the manufacturing of the elastic element 40.

[0056] In other embodiments, such as Figure 8 and Figure 9 As shown, the elastic element 40 is a helical spring. This facilitates the manufacturing of the elastic element 40.

[0057] In other embodiments, such as Figures 10-12 As shown, there are multiple elastic elements 40 arranged at circumferential intervals along the movable pressure ring 50. Specifically, the elastic elements 40 can be welded to the movable pressure ring 50. This allows the clamping force to be provided by multiple elastic elements 40, facilitating the manufacture of individual elastic elements 40.

[0058] Advantageously, such as Figure 2 , Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, the front surface of the back plate 20 is provided with a groove 21. This groove 21 can reduce the impact of mechanical forces such as airflow or vibration on the brush filament bundle 30, reduce the displacement or deformation of the brush filament bundle 30 itself, reduce the friction between the brush filament bundle 30 and the back plate 20, reduce the wear rate of the brush filament bundle 30, reduce the hysteresis effect and stiffening effect of the brush seal structure 1 with movable pressure ring, and provide a certain elastic deformation space for the brush filament bundle 30, so that the brush filament bundle 30 can adapt to problems such as rotor thermal deformation, manufacturing errors, and radial runout, maintain the sealing gap, and ensure the sealing effect.

[0059] More advantageously, the rear surface of the movable pressure ring 50 is provided with a self-lubricating coating. This can further reduce the friction and wear rate between the movable pressure ring 50 and the bristle bundle 30.

[0060] Optionally, the elastic element 40 is a bent sheet metal part with a sheet thickness of 0.2-1 mm. This allows the elastic element 40 to have good elasticity, enabling it to fully rebound to adapt to the vibration of the brush filament bundle 30 and improve the vibration suppression effect on the brush filament bundle 30.

[0061] Other configurations and operations of the brush seal structure 1 with a movable pressure ring according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0062] 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, structure, 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, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the present 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 present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A brush seal structure with a movable pressure ring, characterized in that, include: front panel; A back panel, which is located behind the front panel; A bristle bundle, the bristle bundle being held between the front plate and the back plate; A movable pressure ring, comprising a radial portion and an axial portion, wherein the radial portion extends radially along the movable pressure ring, and the axial portion extends axially from the radial portion toward the front of the movable pressure ring, and the rear end face of the radial portion abuts against the bristle bundle; An elastic element, which abuts against the front end face of the radial portion and the front plate respectively.

2. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The front plate is provided with a mounting groove, and the inner circumferential surface of the axial portion abuts against the radial inner surface of the mounting groove.

3. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The rear surface of the movable pressure ring is constructed as an arc-shaped surface that bulges backward from the radial center compared to the radial inner and outer edges.

4. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The connection between the rear surface and the inner circumferential surface of the movable pressure ring and the connection between the rear surface and the outer circumferential surface are rounded.

5. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The elastic element is annular and extends radially inward from front to back. The elastic element has a plurality of elastic notches spaced apart along the circumference of the elastic element, and the elastic notches are connected to the front edge or the rear edge of the elastic element.

6. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The elastic element is a wave spring or a helical spring.

7. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The elastic elements are multiple and spaced apart circumferentially along the movable pressure ring.

8. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The front surface of the back plate is provided with a groove.

9. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The rear surface of the movable pressure ring is provided with a self-lubricating coating.

10. The brush seal structure with a movable pressure ring according to claim 1, characterized in that, The elastic element is a bent sheet metal part with a sheet metal thickness of 0.2-1 mm.

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