Novel disturbance-suppressing brush seal

Abstract

This invention discloses a novel disturbance-suppressing brush seal, comprising: a brush seal element and a disturbance-suppressing hole opening adjustment structure. The brush seal element includes a front baffle, a brush filament bundle, and a rear baffle. The portion of the front baffle near the rotor has disturbance-suppressing holes evenly arranged circumferentially. The disturbance-suppressing hole opening adjustment structure is installed at the front end of the front baffle and includes an external gear disk, a planetary gear, and an internal gear disk. The internal gear disk is fitted in front of the front baffle and has corresponding holes that mate with the disturbance-suppressing holes on the front baffle. The external gear disk is meshed with the planetary gear and connected to the outside of the internal gear disk. This novel disturbance-suppressing brush seal has a simple structure, reliable operation, and adjustable disturbance-suppressing hole opening, which can evenly suppress disturbances and seal leakage.

Description

Technical Field

[0001] This invention relates to a sealing structure for use in rotating machinery, and in particular to a novel disturbance-suppressing brush seal. Background Technology

[0002] Brush seals are widely used in turbine machinery such as aero engines, steam turbines, and compressors. They consist of a front baffle, a bristle bundle, and a rear baffle. As a flexible contact dynamic seal, the brush bristles move with the rotor when it deflects, resulting in leakage rates that are 1 / 5 to 1 / 10 of traditional labyrinth seals. Currently, brush seals are gradually replacing traditional labyrinth seals. They maintain excellent sealing performance while allowing transient misalignment between the stator and rotor, improving unit efficiency and reducing rotor instability. This is a key technology in the development of modern advanced turbine machinery. Furthermore, the flexible contact between the brush bristles and the rotor shaft improves the vibration characteristics of the rotor system, ensuring the safety of unit operation.

[0003] The airflow within the brush filament bundle of a traditional brush seal is complex. The radial airflow in the gap between the front baffle and the brush filament bundle exerts an unsteady radial airflow force on the front row of brush filaments, lifting them from the rotor surface and causing them to shift towards the front baffle, generating disturbance. This leads to a radial gap between the brush filaments and the rotor surface, increasing the leakage of the brush seal. At the same time, the roots of the disturbed front row of brush filaments are subjected to fatigue stress, making them prone to fatigue fracture and causing premature failure of the brush seal. In addition, the operating conditions in the engine are variable, and the incoming flow pressure is constantly changing, which will also change the degree of disturbance of the brush filaments.

[0004] Therefore, proposing a disturbance-suppressing brush seal that can adapt to changes in engine operating conditions to effectively suppress brush bristle disturbance, extend the service life of the brush bristles and brush seal, and reduce brush seal leakage has become an urgent problem to be solved. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a novel disturbance-suppressing brush seal to solve the problem of disturbance of the front row of brush filaments in existing brush seal structures.

[0006] This invention provides a novel disturbance-suppressing brush seal, comprising: a brush seal element and a disturbance-suppressing hole opening adjustment structure. The brush seal element includes a front baffle, a brush filament bundle, and a rear baffle. The portion of the front baffle near the rotor has disturbance-suppressing holes evenly distributed circumferentially to suppress disturbances in the front row of brush filaments. The disturbance-suppressing hole opening adjustment structure is installed at the front end of the front baffle and includes an external gear disk, a planetary gear, and an internal gear disk. The internal gear disk is fitted in front of the front baffle and has corresponding holes that mate with the disturbance-suppressing holes on the front baffle. The external gear disk is meshed with the planetary gear and connected to the outside of the internal gear disk, allowing the planetary gear to drive the internal gear disk to rotate, thereby adjusting the opening of the disturbance-suppressing hole.

[0007] Preferably, the suppression hole is inclined, and when viewed from the front to the back, the suppression hole is inclined downward.

[0008] Further preferably, when viewed from front to back, the disturbance suppression hole is inclined in the direction of the brush filament bundle.

[0009] Further preferably, the opening direction of the corresponding hole is the same as that of the suppression hole.

[0010] In a further preferred embodiment, the front end face of the front baffle is provided with a boss structure, and the internal gear disk is rotatably mounted on the boss structure via a first bearing.

[0011] Further preferably, there are four planetary gears, which are evenly distributed along the outer periphery of the internal gear disk.

[0012] In a further preferred embodiment, a mounting post is fixedly provided on the front end face of the front baffle, and the planetary gear is rotatably mounted on the mounting post through a second bearing.

[0013] Further preferably, the brush seal is a welded integral structure.

[0014] Further preferably, the novel disturbance-suppressing brush seal further includes: a pressure sensor, a controller, and a drive structure. The pressure sensor is used to monitor the incoming flow pressure of the novel disturbance-suppressing brush seal structure. The output end of the drive structure is connected to the external gear disk of the novel disturbance-suppressing brush seal and is used to drive the external gear disk to rotate. Both the pressure sensor and the drive structure are connected to the controller. The controller is used to adjust the opening of the disturbance-suppressing orifice in real time through the drive structure according to the pressure value monitored by the pressure sensor.

[0015] The novel disturbance-suppressing brush seal structure provided by this invention allows airflow to be introduced between the front baffle and the brush filament bundle through the disturbance-suppressing hole. This effectively prevents radial airflow from the free end of the brush filaments to the root of the brush filaments from forming within the gap between the front baffle and the brush filament bundle. Simultaneously, the axial airflow generated by the introduced airflow applies a reverse torque to the brush filament bundle, effectively suppressing disturbances in the brush filaments. Furthermore, the opening of the disturbance-suppressing hole on the front baffle can be adjusted through the disturbance-suppressing hole adjustment structure to adapt it to the working environment of the brush seal. This effectively suppresses disturbances in the front row of brush filaments while also preventing increased leakage due to excessively large openings of the disturbance-suppressing hole, achieving a balanced effect of suppressing disturbances and sealing leakage.

[0016] The novel disturbance-suppressing brush seal structure provided by this invention has a simple structure, reliable operation, and adjustable opening of the disturbance-suppressing hole. It can effectively suppress the disturbance of the front row of brush filaments of the brush seal while preventing the increase in leakage caused by excessive opening of the disturbance-suppressing hole, thus achieving a balanced effect of suppressing disturbance and sealing leakage. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the structure of the novel disturbance-suppressing brush seal provided by the present invention;

[0019] Figure 2 for Figure 1 Cross-sectional view along direction A. Detailed Implementation

[0020] The present invention will be further explained below with reference to specific implementation schemes, but this explanation does not limit the scope of the invention.

[0021] like Figure 1 , Figure 2 As shown, the present invention provides a novel disturbance-suppressing brush seal, comprising: a brush seal and a disturbance-suppressing hole opening adjustment structure. The brush seal includes a front baffle 11, a brush bundle 12, and a rear baffle 13. The portion of the front baffle 11 near the rotor has disturbance-suppressing holes 111 evenly arranged circumferentially to suppress disturbances in the front row of brush filaments of the brush bundle 12. The disturbance-suppressing hole opening adjustment structure is installed at the front end of the front baffle 11 and includes an external gear disk 21, a planetary gear 22, and an internal gear disk 23. The internal gear disk 23 is disposed in front of the front baffle 11 and has corresponding holes 231 that mate with the disturbance-suppressing holes 111 on the front baffle 11. The external gear disk 21 is meshed with the planetary gear 22 and connected to the outside of the internal gear disk 23, thereby rotating the internal gear disk 23 through the planetary gear 22 to adjust the opening of the disturbance-suppressing holes 111.

[0022] This novel disturbance-suppressing brush seal allows airflow to be introduced between the front baffle and the brush bristle bundle through the disturbance-suppressing hole. This effectively prevents radial airflow from the free end of the brush bristles to the root of the brush bristles from forming within the gap between the front baffle and the brush bristle bundle. Simultaneously, the axial airflow generated by the introduced airflow applies a reverse torque to the brush bristle bundle, effectively suppressing disturbances in the brush bristles. Furthermore, the opening of the disturbance-suppressing hole on the front baffle can be adjusted through the disturbance-suppressing hole adjustment structure to adapt it to the working environment of the brush seal. This effectively suppresses disturbances in the front row of brush bristles while also preventing increased leakage due to excessively large openings of the disturbance-suppressing hole, achieving a balanced effect of suppressing disturbances and sealing leakage.

[0023] The opening of the damping hole can be adjusted according to the incoming flow pressure of the brush seal structure. When the incoming flow pressure increases, the area of ​​the corresponding region between the damping hole and the corresponding hole is increased by adjusting the damping hole opening adjustment structure (by controlling the rotation of the external gear disk to make the planetary gear and the internal gear disk move together), thereby effectively suppressing the violent disturbance of the front row of brush filaments under high pressure ratio. When the incoming flow pressure decreases, the area of ​​the corresponding region between the damping hole and the corresponding hole is reduced by adjusting the damping hole opening adjustment structure. This suppresses the disturbance of the front row of brush filaments of the brush seal and also reduces the axial airflow through the damping hole, thus reducing the leakage of the brush seal structure. Finally, by adjusting the opening, the disturbance of the front row of brush filaments is suppressed while preventing the leakage of the brush seal structure from increasing due to excessive opening of the damping hole.

[0024] As an improvement to the technical solution, such as Figure 2 As shown, the suppression hole 111 is inclined, and when viewed from front to back, the suppression hole 111 is inclined downward.

[0025] As an improvement to the technical solution, when viewed from the front to the back, the disturbance suppression hole 111 is inclined in the direction of the inclination of the brush filament bundle 12.

[0026] As an improvement to the technical solution, such as Figure 2 As shown, the opening direction of the corresponding hole 231 is the same as that of the suppression hole 111.

[0027] As an improvement to the technical solution, such as Figure 2 As shown, the front end face of the front baffle 11 is provided with a boss structure, and the internal gear disk 23 is rotatably mounted on the boss structure through the first bearing 3.

[0028] As an improvement to the technical solution, such as Figure 2 As shown, there are four planetary gears 22, which are evenly distributed along the outer periphery of the internal gear disk 23.

[0029] As an improvement to the technical solution, such as Figure 2 As shown, a mounting post is fixedly provided on the front end face of the front baffle 11, and the planetary gear 22 is rotatably mounted on the mounting post through the second bearing 4.

[0030] As an improvement to the technical solution, the brush seal is a welded integral structure.

[0031] As an improvement to the technical solution, the novel disturbance-suppressing brush seal further includes a pressure sensor, a controller, and a drive structure. The pressure sensor is used to monitor the incoming flow pressure of the novel disturbance-suppressing brush seal structure. The output end of the drive structure is connected to the external gear disk 21 of the novel disturbance-suppressing brush seal and is used to drive the external gear disk 21 to rotate. Both the pressure sensor and the drive structure are connected to the controller. The controller is used to adjust the opening of the disturbance-suppressing orifice in real time through the drive structure according to the pressure value monitored by the pressure sensor.

[0032] This novel disturbance-suppressing brush seal can adjust the opening of the disturbance-suppressing orifice in real time by monitoring the pressure value. Ultimately, it can suppress the disturbance of the front brush filaments while preventing the leakage of the brush seal structure from increasing due to excessive opening of the disturbance-suppressing orifice. The correspondence between the incoming flow pressure and the opening of the disturbance-suppressing orifice can be obtained in advance through a large number of experiments and stored in the incoming flow pressure-disturbance orifice opening correspondence table. During operation, when the incoming flow pressure is obtained, the opening corresponding to the pressure is obtained by looking up the table, and the drive structure sequentially drives the outer gear disk, planetary gear, and inner gear disk to rotate until the corresponding opening is reached. Then the drive structure is closed, thus realizing the opening adjustment.

[0033] The specific embodiments of the present invention are written in a progressive manner, emphasizing the differences between the various implementation schemes, and the similar parts can be referred to each other.

[0034] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A disturbance-suppressing brush seal, characterized in that, include: A brush seal and a disturbance-suppressing hole opening adjustment structure are provided. The brush seal includes a front baffle (11), a brush filament bundle (12), and a rear baffle (13). The front baffle (11) near the rotor has disturbance-suppressing holes (111) evenly arranged along its circumference to suppress disturbances in the front row of brush filaments of the brush filament bundle (12). The disturbance-suppressing hole opening adjustment structure is installed at the front end of the front baffle (11) and includes an external gear disk (21), a planetary gear (22), and an internal gear. The inner gear disk (23) is disposed in front of the front baffle (11) and has a corresponding hole (231) that mates with the suppression hole (111) on the front baffle (11). The outer gear disk (21) is connected to the outside of the inner gear disk (23) by meshing with the planetary gear (22) and is used to drive the inner gear disk (23) to rotate by the planetary gear (22), thereby adjusting the opening of the suppression hole (111).

2. The disturbance-suppressing brush seal according to claim 1, characterized in that: The suppression hole (111) is inclined, and when viewed from the front to the back, the suppression hole (111) is inclined downward.

3. The disturbance-suppressing brush seal according to claim 2, characterized in that: Viewed from front to back, the disturbance suppression hole (111) is inclined in the direction of the filament bundle (12).

4. The disturbance-suppressing brush seal according to claim 2, characterized in that: The corresponding hole (231) has the same opening direction as the suppression hole (111).

5. The disturbance-suppressing brush seal according to claim 1, characterized in that: The front end face of the front baffle (11) is provided with a boss structure, and the internal gear disk (23) is rotatably mounted on the boss structure through the first bearing (3).

6. The disturbance-suppressing brush seal according to claim 1, characterized in that: There are four planetary gears (22), which are evenly distributed along the outer periphery of the inner gear disk (23).

7. The disturbance-suppressing brush seal according to claim 1, characterized in that: A mounting post is fixedly provided on the front end face of the front baffle (11), and the planetary gear (22) is rotatably mounted on the mounting post through the second bearing (4).

8. The disturbance-suppressing brush seal according to claim 1, characterized in that: The brush seal is a welded, one-piece structure.

9. The disturbance-suppressing brush seal according to claim 1, characterized in that, Also includes: The pressure sensor, controller, and drive structure are provided. The pressure sensor is used to monitor the incoming flow pressure of the disturbance-suppressing brush seal structure. The output end of the drive structure is connected to the external gear disk (21) of the disturbance-suppressing brush seal and is used to drive the external gear disk (21) to rotate. Both the pressure sensor and the drive structure are connected to the controller. The controller is used to adjust the opening of the disturbance-suppressing hole in real time through the drive structure according to the pressure value monitored by the pressure sensor.

Images