Brush type sealing structure with special-shaped pressure spring

Abstract

The utility model discloses a brush type sealing structure with a special-shaped pressure spring. The brush type sealing structure with the special-shaped pressure spring 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 special-shaped compression spring is in a circular ring shape and comprises a front abutting portion, a rear abutting portion and a compression portion, the front surface of the front abutting portion abuts against the front plate, the rear surface of the rear abutting portion abuts against the brush wire bundle, the compression portion is connected with the front abutting portion and the rear abutting portion, and the compression portion is connected with the front abutting portion and the rear abutting portion. And the front abutting part and the rear abutting part are coaxially arranged. The brush type sealing structure with the special-shaped pressure spring 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 an irregularly shaped compression spring. 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 an irregularly shaped compression spring, which has the advantages of 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 an irregularly shaped compression spring. The brush seal structure with an irregularly shaped compression spring includes: a front plate; a back plate located behind the front plate; a bristle bundle sandwiched between the front plate and the back plate; and an irregularly shaped compression spring, which is annular and includes a front abutment portion, a rear abutment portion, and a compression portion. The front surface of the front abutment portion abuts against the front plate, the rear surface of the rear abutment portion abuts against the bristle bundle, and the compression portion is connected to both the front abutment portion and the rear abutment portion. The front abutment portion and the rear abutment portion are coaxially arranged.

[0006] The brush-type sealing structure with irregularly shaped compression spring according to the embodiments of this utility model has the advantages of good sealing effect and long service life.

[0007] In addition, the brush sealing structure with irregularly shaped compression spring according to the above embodiments of this utility model may also have the following additional technical features:

[0008] According to one embodiment of the present invention, the rear surface of the rear abutment portion is constructed as an arc-shaped surface that bulges rearward from the radial center relative to the radial inner and outer edges.

[0009] According to one embodiment of the present invention, the compression section has a V-shaped cross-section perpendicular to the circumferential direction of the compression section.

[0010] According to one embodiment of the present invention, the compression section includes a plurality of compression units, which are arranged in a front-to-back direction, and each compression unit has a V-shaped cross-section perpendicular to the circumference of the compression section.

[0011] According to one embodiment of the present invention, the rear surface of the front plate is provided with a mounting groove, and the front abutment portion is fitted into the mounting groove.

[0012] According to one embodiment of the present invention, the inner edge of the front abutment portion abuts against the radial inner surface of the mounting groove.

[0013] According to one embodiment of the present invention, the front abutment portion is a plane extending radially.

[0014] According to one embodiment of the present invention, the projections of the front abutment portion and the rear abutment portion in a plane perpendicular to the axial direction at least partially overlap.

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

[0016] According to one embodiment of the present invention, the irregular compression spring is a bent sheet metal part 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 an irregularly shaped compression spring according to some specific embodiments of the present invention.

[0020] Figure 2 This is a partial cross-sectional view of a brush seal structure with an irregularly shaped compression spring according to some specific embodiments of the present invention.

[0021] Figure 3 This is a partial cross-sectional view of a brush-type sealing structure with an irregularly shaped compression spring according to some specific embodiments of the present invention.

[0022] Figure 4 This is a partial cross-sectional view of a brush seal structure with an irregularly shaped compression spring according to some other specific embodiments of the present invention.

[0023] Figure 5This is a partial cross-sectional view of a brush-type sealing structure with an irregularly shaped compression spring according to some other specific embodiments of the present invention.

[0024] Reference numerals: 1. Brush seal structure with irregularly shaped compression spring; 2. Front plate; 3. Mounting groove; 4. Back plate; 5. Groove; 6. Brush filament bundle; 7. Irregularly shaped compression spring; 8. Front abutment part; 9. Rear abutment part; 10. Compression part; 11. Compression unit; 22. Compression unit; 33. Compression unit; 431. Detailed Implementation

[0025] This application is based on the inventor's discoveries and understanding of the following facts and problems:

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The following description, with reference to the accompanying drawings, describes a brush seal structure 1 with an irregularly shaped compression spring according to an embodiment of the present invention.

[0033] like Figures 1-5 As shown, the brush sealing structure 1 with irregularly shaped compression spring according to an embodiment of the present invention includes a front plate 10, a back plate 20, a brush filament bundle 30 and an irregularly shaped compression spring 40.

[0034] The back plate 20 is located behind the front plate 10 (as shown by the arrows in the figure in the front-to-back and inside-out directions). The bristle bundle 30 is clamped between the front plate 10 and the back plate 20. The irregular compression spring 40 is annular and includes a front abutment part 41, a rear abutment part 42, and a compression part 43. The front surface of the front abutment part 41 abuts against the front plate 10, the rear surface of the rear abutment part 42 abuts against the bristle bundle 30, and the compression part 43 is connected to both the front abutment part 41 and the rear abutment part 42. The front abutment part 41 and the rear abutment part 42 are coaxially arranged.

[0035] Specifically, the fluid flows from front to back, with the front of the front plate 10 being the high-pressure side and the back of the back plate 20 being the low-pressure side.

[0036] The compression part 43 is adapted to compress to shorten the distance between the front abutment part 41 and the rear abutment part 42.

[0037] According to the embodiment of the present invention, the brush sealing structure 1 with irregularly shaped springs 40 is provided. By using the irregularly shaped springs 40 to abut against the front plate 10 and the brush bundle 30 respectively, the irregularly shaped springs 40 can provide clamping force to the brush bundle 30, suppress the chattering phenomenon of the brush bundle 30, prevent the brush 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 bundle 30, and extend the service life of the brush sealing structure 1 with irregularly shaped springs.

[0038] Furthermore, by setting a shaped compression spring 40, which directly abuts against the brush filament bundle 30, compared to the method of using a pressure ring to provide clamping force to the brush filament bundle in related technologies, on the one hand, the force applied by the shaped compression spring 40 is more stable than that of the airflow-driven method, so as to reduce wear while ensuring the clamping effect. On the other hand, compared to the method of using an elastic element to drive the pressure ring, the pressure ring can be eliminated, avoiding the relative displacement between the pressure ring and the elastic element that would cause frequent friction between the pressure ring and the brush filament bundle. This makes it less likely for radial relative displacement to occur between the brush filament bundle 30 and the shaped compression spring 40, preventing the brush filament bundle 30 from being frequently rubbed and worn quickly due to relative displacement between the pressure ring and the brush filament bundle, thereby alleviating the wear rate of the brush filament bundle 30 and increasing the service life of the brush seal structure 1 with the shaped compression spring.

[0039] Furthermore, by providing a front abutment portion 41, a rear abutment portion 42, and a compression portion 43, with the front abutment portion 41 and the rear abutment portion 42 coaxially arranged, the front abutment portion 41 and the rear abutment portion 42 can move coaxially when the irregular compression spring 40 is deformed. This avoids radial displacement of the rear abutment portion 42 during compression, thereby preventing radial relative movement between the rear abutment portion 42 and the brush filament bundle 30. This further avoids frequent friction between the brush filament bundle 30 and the rear abutment portion 42, which would accelerate the wear of the brush seal structure 1 with the irregular compression spring, and further improves the service life of the brush seal structure 1 with the irregular compression spring.

[0040] Therefore, the brush sealing structure 1 with irregularly shaped compression spring according to the present utility model has the advantages of good sealing effect and long service life.

[0041] The following description, with reference to the accompanying drawings, describes a brush seal structure 1 with an irregularly shaped compression spring according to a specific embodiment of the present invention.

[0042] In some specific embodiments of this utility model, such as Figures 1-5 As shown, the brush sealing structure 1 with irregularly shaped compression spring according to an embodiment of the present invention includes a front plate 10, a back plate 20, a brush filament bundle 30 and an irregularly shaped compression spring 40.

[0043] Advantageously, such as Figures 2-5As shown, the rear surface of the rear abutment portion 42 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 shaped spring 40 and the brush filament bundle 30, thereby reducing the friction between the brush filament bundle 30 and the shaped spring 40, reducing the wear rate between the brush filament bundle 30 and the shaped spring 40, and further extending the service life of the brush seal structure 1 with the shaped spring.

[0044] In some embodiments, such as Figures 1-3 As shown, the compression part 43 has a V-shaped cross-section perpendicular to its circumference. This facilitates elastic deformation of the compression part 43 and allows the front abutment part 41 and the rear abutment part 42 to move coaxially.

[0045] In other embodiments, such as Figure 4 and Figure 5 As shown, the compression section 43 includes a plurality of compression units 431, which are arranged along the front-to-back direction. Each compression unit 431 has a V-shaped cross-section perpendicular to the circumference of the compression section 43. This facilitates elastic deformation of the compression section 43 and also facilitates coaxial movement of the front abutment section 41 and the rear abutment section 42.

[0046] Figures 1-5 A brush seal structure 1 with an irregularly shaped compression spring is shown as an example of some examples of the present invention. For example... Figure 2 and Figure 4 As shown, the rear surface of the front plate 10 is provided with a mounting groove 11, and the front abutment part 41 fits into the mounting groove 11. In this way, the mounting groove 11 can be used to position the irregular compression spring 40, which facilitates the installation of the irregular compression spring 40 and improves the stability of the irregular compression spring 40 after installation.

[0047] Specifically, such as Figure 2 and Figure 4 As shown, the inner edge of the front abutment portion 41 abuts against the radially inner surface of the mounting groove 11. This facilitates radial positioning of the shaped compression spring 40, prevents radial displacement of the front abutment portion 41, thereby avoiding radial displacement of the rear abutment portion 42, improving the stability of the shaped compression spring 40, and preventing accelerated wear of the brush filament bundle 30 due to radial displacement of the shaped compression spring 40, thus extending the service life of the brush seal structure 1 with the shaped compression spring.

[0048] More specifically, such as Figures 2-5 As shown, the front abutment portion 41 is a planar surface extending radially. This further improves the stability of the shaped compression spring 40 and extends the service life of the brush seal structure 1 with the shaped compression spring.

[0049] Furthermore, such as Figures 2-5As shown, the projections of the front abutment portion 41 and the rear abutment portion 42 in a plane perpendicular to the axial direction at least partially overlap. Specifically, the front abutment portion 41 and the rear abutment portion 42 are located on the same side of the compression portion 43 in the radial direction. This further avoids radial displacement of the rear abutment portion 42 during compression, thereby preventing radial relative movement between the rear abutment portion 42 and the brush filament bundle 30, further preventing frequent friction between the brush filament bundle 30 and the rear abutment portion 42 that would accelerate the wear of the brush seal structure 1 with the shaped pressure spring, and further improving the service life of the brush seal structure 1 with the shaped pressure spring.

[0050] Advantageously, such as Figure 2 and Figure 4 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 irregular compression spring, 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.

[0051] More advantageously, the rear surface of the rear abutment portion is provided with a self-lubricating coating. This can further reduce the friction and wear rate between the shaped compression spring 40 and the brush bundle 30.

[0052] Optionally, the irregularly shaped compression spring 40 is a bent sheet metal part with a sheet thickness of 0.2-1 mm. This allows the irregularly shaped compression spring 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.

[0053] Other configurations and operations of the brush seal structure 1 with irregularly shaped compression spring according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0054] 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.

[0055] 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 an irregularly shaped compression spring, 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; An irregularly shaped compression spring, which is circular, includes a front abutment portion, a rear abutment portion, and a compression portion. The front surface of the front abutment portion abuts against the front plate, and the rear surface of the rear abutment portion abuts against the brush bristle bundle. The compression portion is connected to the front abutment portion and the rear abutment portion respectively, and the front abutment portion and the rear abutment portion are coaxially arranged.

2. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The rear surface of the rear abutment portion is an arc-shaped surface that bulges rearward from the radial center compared to the radial inner and outer edges.

3. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The compression section has a V-shaped cross-section perpendicular to its circumference.

4. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The compression section includes multiple compression units, which are arranged in a front-to-back direction. Each compression unit has a V-shaped cross-section perpendicular to the circumference of the compression section.

5. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The rear surface of the front plate is provided with a mounting groove, and the front abutment part is fitted into the mounting groove.

6. The brush seal structure with irregularly shaped compression spring according to claim 5, characterized in that, The inner edge of the front abutment portion abuts against the radial inner surface of the mounting groove.

7. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The front abutment portion is a plane extending radially.

8. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The projections of the front abutment and the rear abutment in a plane perpendicular to the axial direction at least partially overlap.

9. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The rear surface of the rear abutment portion is provided with a self-lubricating coating.

10. The brush seal structure with irregularly shaped compression spring according to claim 1, characterized in that, The irregularly shaped compression spring is a bent sheet metal part with a sheet metal thickness of 0.2-1 mm.

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