Double-front-baffle three-cavity brush seal structure

A technology of brush seals and front baffles, applied in the direction of leakage prevention, engine components, machines/engines, etc., can solve problems affecting the service life of brush seals, aggravate the friction and wear between the brush tip and the rotor, and reduce airflow Direct leakage, avoiding friction, weakening the effect of lateral flow of airflow

Inactive Publication Date: 2019-07-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increased friction between the brush filaments and the tight aggregation of the brush filament bundles caused by the axial differential pressure load lead to an increase in the stiffness of the brush filament bundles, resulting in a "stiffening effect", which greatly intensifies the friction and wear between the brush filament tip and the rotor, and the temperature of the brush filament tip It will even be close to the melting point of the brush material, seriously affecting the service life of the brush seal

Method used

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  • Double-front-baffle three-cavity brush seal structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: see figure 1 It is a double front baffle three-cavity brush seal structure, the brush seal includes a first front baffle 1, a second front baffle 2, a first front cavity 3, a second front cavity 4, a rear baffle Plate 5 , rear cavity 6 , welding zone 7 , brush bundle 8 . The first front baffle 1, the second front baffle 2 and the rear baffle 5 are respectively located on both sides of the brush tow 8, and the inner diameter ends of the second front baffle 2 and the rear baffle 5 have protrusions and inverted horn. A first front cavity exists between the double front plates, a second front cavity 4 exists between the second front baffle plate 2 and the brush filament bundle 8, and a rear cavity exists between the rear baffle plate and the brush filament bundle. The function of the first front cavity is to weaken the lateral flow of high-pressure gas before entering the brush bundle, and the function of the second front cavity and the rear cavity is to red...

Embodiment 2

[0017] Example 2: see figure 1 , as an improvement of the present invention, the thickness of the first front baffle 1 is 0.5-0.9mm, the protection height is 2mm-4mm and does not exceed the protection height of the second front baffle; the thickness of the second front baffle is 0.4mm ~0.8mm, the protection height is 3mm~4mm; the thickness of the rear baffle is 0.3mm~0.7mm, the protection height is 1mm~3mm and does not exceed the protection height of the first front baffle; the axial distance of the first front cavity is 1mm~ 2.5mm, the axial distance between the second front cavity is 0.5mm-0.9mm, and the axial distance between the rear cavity is 1mm-1.5mm; the axial distance between the brush filament bundle and the protrusion at the inner diameter end of the rear baffle is less than 0.3mm. The protection heights of the three baffles and the axial spacing of the three chambers are adjusted according to the shape of the rotor and the application site to achieve the best seali...

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PUM

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Abstract

The invention discloses a double-front-baffle three-cavity brush seal structure. The brush seal structure comprises a first front baffle (1), a second front baffle (2), a rear baffle (5), a fusion welding area (7) and a bristle bundle (8). The first front baffle (1), the second front baffle (2) and the rear baffle (5) are sequentially arranged side by side. A first front cavity (3) is formed between the double front baffles, namely the first front baffle (1) and the second front baffle (2). A second front cavity (4) is formed between the second front baffle (2) and the bristle bundle (8). A rear cavity (6) is formed between the rear baffle (5) and the bristle bundle (8). Bulges and chamfers are correspondingly arranged at the inner diameter ends of the second front baffle (2) and the rearbaffle (5). The double front plates and the rear baffle (5) are correspondingly located on the two sides of the bristle bundle. By the adoption of the technical scheme, the hysteresis effect of a conventional brush seal is eliminated and reduced, the friction between the bristle bundle and a rotor is reduced, the service life of the brush seal is prolonged, the structure is simple and processing is easy.

Description

technical field [0001] The invention relates to a double-front plate and three-cavity brush seal, which belongs to the technical field of dynamic seal structural components in turbomachinery. Background technique [0002] Sealing parts are used to control the leakage between rotating parts and non-rotating parts. It is one of the important components of aircraft engines, gas turbines and other machinery. Good sealing effect can reduce airflow leakage and fuel consumption inside the engine, thereby improving engine thrust And reduce fuel consumption. As a new type of contact air seal, the brush seal usually does not exceed 1 / 3 of the leakage of the traditional labyrinth seal. This is because the brush seal has flexible and densely packed brush wires, which can prevent the dynamic and static parts of the engine from transiently violent Good sealing performance is guaranteed when eccentric, thus greatly improving the efficiency and stability of turbomachinery. Since the adven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D11/00F01D11/08
CPCF01D11/003F01D11/08
Inventor 储成林陈磊
Owner SOUTHEAST UNIV
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