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Brush seal with restrained bristles

A brush-type sealing and constrained technology, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve problems such as brush wire vibration, and achieve the effects of saving manufacturing costs, reducing leakage, and increasing tightness

Inactive Publication Date: 2014-10-08
南京博沃科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design of the pressure balance chamber needs to be carefully designed, not only is it more likely to produce a "pressure closure effect", but it is also prone to cause brush filament chattering

Method used

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  • Brush seal with restrained bristles
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  • Brush seal with restrained bristles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Such as Figure 5-12 The brush seal with constrained brush filaments shown is installed at the blade tip of the high-pressure turbine of an aero-engine, including an upstream ring, a downstream ring, brush filaments clamped between the upstream ring and the downstream ring, and more than one stop piece , the limit piece is in the shape of a long strip; one end of the limit piece is a fixed end, and the other end is a free end; The width direction of the position piece crosses the thickness direction of the brush filament bundle along the axial direction, and the fixed end of the limit piece is arranged between the fixed ends of the brush filaments.

[0074] A limiting groove is provided on the side of the downstream ring adjacent to the limiting piece and the brush filaments. The limiting groove is in the shape of a ring arranged along the entire circle of the downstream ring and is concentric with the inner hole of the brush seal. The limit plate is provided with a pr...

Embodiment 2

[0076] Such as Figures 13 to 15 As shown, it is basically the same as Embodiment 1, the difference is that the brush seal with constrained brush filaments is used as the seal of the balance disk between the high and medium pressure cylinders of the steam turbine. The length of the protrusion is slightly shorter than the length of the limiting groove. In the free state, the vertical distance between the lower end of the protrusion (limiting point) and the inner wall of the limiting groove (the direction from the fixed end to the free end is defined as the direction from the top to the bottom) is 0.5mm, but under certain radial air flow, the limit point is in contact with the inner wall of the limit groove. The direction from the fixed end to the free end of the limiting piece is defined as the direction from the upper end to the lower end of the protrusion. The surface layer of the limiting plate is provided with a wear-resistant layer of 5 μm, and the wear-resistant layer is...

Embodiment 3

[0078] Such as Figures 16-17 As shown, it is basically the same as that of Example 1, the difference is that the thickness of the limit piece along the length direction is different, and it is wedge-shaped, and the thickness gradually decreases from the fixed end to the free end; the opposite of the two adjacent limit pieces face parallel. The length of the spacer is 20mm, the width is 1-5mm, and the thickness is 0.05-0.3mm.

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Abstract

The invention discloses a brush seal with restrained bristles. The brush seal comprises an upper loose ring, a lower loose ring and the bristles clamped between the upper loose ring and the lower loose ring. The brush seal further comprises more than one limit piece shaped in elongated sheets, one ends of the limit pieces are fixed end, the other ends of the limit pieces are free ends, and the limit pieces are arranged between the upper loose ring and the lower loose ring and are arranged among the bristles in a circle at intervals, the bristles between the two adjacent limit pieces are defined as a bristle bundle, the width direction of the limit pieces cross the thickness direction of the bristle bundles axially, and the fixed ends of the limit pieces are arranged among the fixed ends of the bristles. The brush seal with restrained bristles mainly aims at providing a solution scheme for incontrollable 'pressure closure effect' of a conventional brush seal, structural stability of the brush seal is not only greatly improved, but arrangement density of the bristles is favorably improved, leakage among the bristles is reduced and sealing performance of the brush seal is improved. Further, the invention provides a new way for reducing wear rate of the brush seal.

Description

technical field [0001] The invention belongs to the field of rotary mechanical seals, in particular to a brush seal with constrained brush filaments. Background technique [0002] In rotating machinery, different types of seals are often used to seal different pressure chambers, including grate seals, brush seals, fingertip seals, graphite seals, etc. In most occasions, the grate seal and the brush seal are often selected. The grate seal has the advantages of high reliability and long life, while the brush seal has better sealing performance. [0003] Brush seals are one of the key technologies in the development of modern advanced turbomachinery, and have been used in turbomachinery such as aero-engines, industrial gas turbines and steam turbines. The basic structure of the brush seal includes at least an upstream ring, a downstream ring and a brush filament, and the brush filament is clamped between the upstream ring and the downstream ring. The above-mentioned brush fil...

Claims

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Application Information

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IPC IPC(8): F16J15/16
Inventor 韦红旗石伟伟
Owner 南京博沃科技发展有限公司