Boot-type brush seal structure between opposing rotating shafts that can suppress centrifugal effects

Abstract

The present invention discloses a boot-shaped brush seal structure between opposed rotating shafts capable of suppressing centrifugal effects, which includes an inner rotor, an outer rotor, a front baffle, a rear baffle, a brush bundle, and a brush fixing boot. Among them, the front baffle, the brush bundle, and the rear baffle are sequentially fixed to the inner side of the outer rotor along the axial direction of the outer rotor. The brush fixing boot is annular, and the brush fixing boot is fixed to the free end of the brush bundle and is in clearance fit with the inner rotor for sealing the inner rotor. This boot-shaped brush seal structure between opposed rotating shafts capable of suppressing centrifugal effects has a reasonable structure, can prevent the generation of an annular leakage channel between the brush tip and the inner rotor, and effectively improves the sealing performance of the brush seal between opposed rotating shafts.

Description

Technical Field

[0001] The present invention relates to a brush seal structure between rotating shafts, and particularly provides a boot-shaped brush seal structure between rotating shafts that can suppress the centrifugal effect. Background Art

[0002] Brush seals are key seal technologies widely used in turbomachinery fields such as aeroengines and gas turbines. They consist of a front baffle, brush filaments, and a rear baffle. The leakage of a brush seal is only 10 - 20% of that of a traditional labyrinth seal, so it is widely used as an advanced seal form. A brush seal is a flexible contact dynamic seal technology. The brush filaments have good flexibility and can follow the movement of an eccentric rotor, having good sealing performance and improving the dynamic characteristics of the rotor, which is beneficial to ensuring the safe and stable operation of an aeroengine group. Therefore, brush seals play an important role in the turbomachinery seal fields of industries such as aerospace.

[0003] Conventional brush seals are applied to single-rotor parts and are installed on the outer stator, and the overall brush seal structure remains stationary. However, there is also a sealing requirement in the area between counter-rotating shafts of turbomachinery, and the working conditions between counter-rotating shafts are more demanding. The seal structure not only needs to maintain excellent sealing performance under high linear velocity conditions, but also needs to have a high adaptability to the radial runout of the rotor. The brush seal has better sealing performance than traditional labyrinth non-contact seals, and the brush seal has stronger adaptability to the radial runout of the rotor than graphite seals. Therefore, due to its own flexibility and excellent sealing performance and other characteristics, the brush seal meets the sealing requirements in the area between counter-rotating shafts.

[0004] However, there are engineering problems in applying a basic brush seal in the area between counter-rotating shafts: such as Figure 4 As shown, if the brush filaments are installed on the outer rotor, when the outer rotor drives the brush filaments to rotate at high speed, under the action of high-speed centrifugal force, the flexible brush filaments tend to expand radially outwards, and the presence of the inner rotor cannot provide a spatial constraint on the tips of the brush filaments. Therefore, the sealing circle radius formed by the free ends of the brush filaments will become larger (as Figure 5 shown), and a new leakage channel will be formed between the free ends of the brush filaments and the inner rotor, affecting the overall sealing performance of the brush seal.

[0005] Therefore, it has become an urgent problem to be solved to propose a new brush seal structure between counter-rotating shafts to improve the sealing performance of the brush seal. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a boot-shaped brush seal structure between counter-rotating shafts that can suppress the centrifugal effect to solve the problem of poor sealing performance of the existing brush seal structure between counter-rotating shafts.

[0007] The technical solution provided by the present invention is: a boot-type brush seal structure between opposed rotating shafts that can suppress the centrifugal effect, including an inner rotor, an outer rotor, a front baffle, a rear baffle, a brush bundle, and a brush fixing boot. Among them, the front baffle, the brush bundle, and the rear baffle are sequentially fixed to the inner side of the outer rotor along the axial direction of the outer rotor. The brush fixing boot is annular, and the brush fixing boot is fixed to the free end of the brush bundle and is in clearance fit with the inner rotor for sealing the inner rotor.

[0008] Preferably, the brush fixing boot is fixedly connected by a plurality of petal-shaped brush fixing boot units along its circumferential direction.

[0009] Further preferably, the brush fixing boot includes a brush fixing boot body and a wear-resistant base. The outer side of the brush fixing boot body is fixedly connected to the free end of the brush bundle, and the wear-resistant base is fixedly connected to the inner side of the brush fixing boot body.

[0010] Further preferably, both the brush fixing boot body and the brush bundle are metal structural parts, and the two are fixedly connected by welding.

[0011] Further preferably, the brush fixing boot body and the wear-resistant base are clamped by a mortise and tenon structure and then fastened by bolts.

[0012] Further preferably, a pressure relief groove is provided on the inner side of the brush fixing boot.

[0013] Further preferably, a circumferential boss is provided on the outer periphery of the inner rotor, and the circumferential boss is arranged at the rear side of the brush fixing boot.

[0014] For the boot-type brush seal structure between opposed rotating shafts that can suppress the centrifugal effect provided by the present invention, the brush bundle is fixed to the inner side of the outer rotor, and the brush fixing boot is installed at the free end of the brush bundle. The brush fixing boot plays a role in spatially constraining the brush bundle, which can limit the tendency of the brush to expand radially outward under the action of high-speed centrifugation, prevent the generation of an annular leakage channel between the brush tip and the inner rotor, solve the leakage channel problem at high speeds, suppress the adverse effects of the centrifugal effect on the overall sealing performance, and improve the sealing performance of the brush seal between opposed rotating shafts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following further describes the present invention in detail with reference to the drawings and embodiments:

[0016] Figure 1 is a sectional view of the boot-type brush seal structure between opposed rotating shafts that can suppress the centrifugal effect provided by the present invention;

[0017] Figure 2 is an axial view of the boot-type brush seal structure between opposed rotating shafts that can suppress the centrifugal effect provided by the present invention;

[0018] Figure 3 Partial enlarged view of the brush fixing boot

[0019] Figure 4 Axial view of the existing brush seal structure between the rotating shafts

[0020] Figure 5 For Figure 4 Schematic diagram of the brush seal structure between the rotating shafts shown in the high-speed working state Specific implementation mode

[0021] The present invention will be further explained below in combination with specific implementation schemes, but the present invention is not limited thereto

[0022] As Figures 1 to 3 As shown, the present invention provides a boot-type brush seal structure between rotating shafts that can suppress the centrifugal effect, including an inner rotor 1, an outer rotor 2, a front baffle 3, a rear baffle 4, a brush bundle 5, and a brush fixing boot 6. Among them, the front baffle 3, the brush bundle 5, and the rear baffle 4 are sequentially fixed to the inner side of the outer rotor 2 along the axis of the outer rotor 2. The brush fixing boot 6 is annular, and the brush fixing boot 6 is fixed to the free end of the brush bundle 5 and is in clearance fit with the inner rotor 1 for sealing the inner rotor 1

[0023] For the boot-type brush seal structure between rotating shafts that can suppress the centrifugal effect, the brush bundle is fixed to the inner side of the outer rotor, and the free end of the brush bundle is installed with a brush fixing boot. The brush fixing boot plays a role of spatial constraint on the brush bundle, which can limit the tendency of the brush wire to expand radially outward under the centrifugal force at high speed, prevent the generation of an annular leakage channel between the brush tip and the inner rotor, solve the leakage channel problem at high speed, suppress the adverse effect of the centrifugal effect on the overall sealing performance, and improve the sealing performance of the brush seal between the rotating shafts

[0024] As an improvement of the technical solution, the brush fixing boot 6 is fixedly connected by a plurality of petal-shaped brush fixing boot units along its circumferential direction

[0025] As an improvement of the technical solution, as Figure 3 shown, the brush fixing boot 6 includes a brush fixing boot body 61 and a wear-resistant base 62. The outer side of the brush fixing boot body 61 is fixedly connected to the free end of the brush bundle 5, and the wear-resistant base 62 is fixedly connected to the inner side of the brush fixing boot body 61

[0026] As an improvement of the technical solution, both the brush fixing boot body 61 and the brush bundle 5 are metal structural parts, and the two are fixedly connected by welding

[0027] As an improvement of the technical solution, as Figure 3As shown, the brush wire fixing boot body 61 and the wear-resistant base 62 are clamped through a mortise and tenon structure and then fastened with bolts.

[0028] As an improvement of the technical solution, as Figure 2 shown, a pressure relief groove 63 is provided on the inner side of the brush wire fixing boot 6, which is used to enhance the hydrodynamic pressure effect, reduce the indirect contact force between the inner rotor and the brush wire fixing boot, improve the contact state between the two, slow down the wear problem, and improve the overall service life of the sealing structure.

[0029] As an improvement of the technical solution, as Figure 1 shown, a circumferential boss 11 is provided on the outer periphery of the inner rotor 1, and the circumferential boss 11 is arranged at the rear side of the brush wire fixing boot 6, which is used to limit the axial movement of the brush wire fixing boot 6.

[0030] The specific embodiments of the present invention are written in a progressive manner, emphasizing the differences between each embodiment, and the similar parts can be referred to each other.

[0031] The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. A boot-type brush seal structure between opposed rotating shafts that can suppress the centrifugal effect, characterized in that, Including: Inner rotor (1), outer rotor (2), front baffle (3), rear baffle (4), brush filament bundle (5) and brush filament fixing boot (6). Among them, the front baffle (3), brush filament bundle (5) and rear baffle (4) are sequentially fixed to the inner side of the outer rotor (2) along the axial direction of the outer rotor (2). The brush filament fixing boot (6) is annular. The brush filament fixing boot (6) is fixed to the free end of the brush filament bundle (5) and is in clearance fit with the inner rotor (1) for sealing the inner rotor (1). The brush filament fixing boot (6) includes a brush filament fixing boot body (61) and a wear-resistant base (62). The outer side of the brush filament fixing boot body (61) is fixedly connected to the free end of the brush filament bundle (5). The wear-resistant base (62) is fixedly connected to the inner side of the brush filament fixing boot body (61). An unloading groove (63) is provided on the inner side of the brush filament fixing boot (6).

2. The boot-shaped brush seal structure between the opposed rotating shafts capable of suppressing the centrifugal effect according to claim 1, characterized in that: The brush filament fixing boot (6) is fixedly connected by multiple petal-shaped brush fixing boot units along its circumferential direction.

3. The boot-shaped brush seal structure between opposed rotating shafts capable of suppressing centrifugal effect according to claim 1, wherein: Both the brush filament fixing boot body (61) and the brush filament bundle (5) are metal structural parts and are fixedly welded.

4. The boot-type brush seal structure between counter-rotating shafts capable of suppressing the centrifugal effect according to claim 1, characterized in that: The brush filament fixing boot body (61) and the wear-resistant base (62) are clamped through a mortise and tenon structure and then fastened by bolts.

5. The boot-type brush seal structure between opposed rotating shafts capable of suppressing centrifugal effects according to claim 1, wherein: A circumferential boss (11) is provided on the outer periphery of the inner rotor (1). The circumferential boss (11) is arranged at the rear side of the brush filament fixing boot (6).

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