Unlock instant, AI-driven research and patent intelligence for your innovation.

A brush seal with constrained brush filaments

A brush-type sealing and constrained technology, applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve problems such as brush wire flutter, and achieve the effect of saving manufacturing costs, reducing leakage, and reducing requirements

Inactive Publication Date: 2016-10-12
南京博沃科技发展有限公司
View PDF6 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A brush seal with constrained brush filaments
  • A brush seal with constrained brush filaments
  • A brush seal with constrained brush filaments

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a brush-type seal with constrained brush filaments, which includes an upstream ring, a downstream ring, and brush filaments clamped between the upstream ring and the downstream ring, and also includes more than one limiting piece, the limiting piece is a long strip One end of the limiting piece is a fixed end, and the other end is a free end; the limiting piece is set between the upstream ring and the downstream ring, and is arranged alternately between the whole circle of brush filaments, and between two adjacent limiting pieces The brush filaments are defined as brush filament bundles, the width direction of the limiting sheet crosses the thickness direction of the brush filament bundle along the axial direction, and the fixed ends of the limiting sheets are arranged between the fixed ends of the brush filaments. The brush seal with constrained brush filaments of the present invention is mainly a solution to the uncontrollable "pressure closure effect" of the traditional brush seal, which not only greatly enhances the structural stability of the brush seal, but also facilitates the increase in the arrangement of brush filaments. Tightness, thereby reducing the leakage between the brush filaments and improving the sealing performance of the brush seal. Furthermore, the present invention proposes a new way of reducing the wear rate of brush seals.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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