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Labyrinth and fingertip combined type seal structure

A sealing structure and fingertip sealing technology, which is applied to engine sealing, leakage prevention, engine components, etc., can solve problems such as unbearable pressure difference, unsuitable for high pressure ratio axial sealing, etc., to prevent gas leakage and reduce manufacturing Cost, make up for the effect of large leakage

Inactive Publication Date: 2010-02-17
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is this easy-to-deform structure that makes it unable to withstand large pressure differences, and is not suitable for the axial seal of high-pressure ratio impeller machinery.

Method used

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  • Labyrinth and fingertip combined type seal structure
  • Labyrinth and fingertip combined type seal structure
  • Labyrinth and fingertip combined type seal structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0023] combine figure 1 and figure 2 . The sealing structure of the present invention includes a labyrinth seal and a fingertip seal; the fingertip seal includes a first high-pressure sealing fingertip 3, a second high-pressure sealing fingertip 4, and a low-pressure sealing fingertip 5 with a fingertip shoe , there is an arc-shaped gap on the fingertip piece, the three fingertip pieces are fixed together, a front baffle 1 is set in front of the high-pressure sealing level fingertip piece, and a rear baffle is set behind the low-pressure sealing level fingertip piece with fingertip boots Plate 6; labyrinth seal is the seal tooth 7 that is inlaid on the front baffle. There are bolt holes 2 on the periphery of the fingertip sheet and the front and rear baffles to fix the fingertip sheet and connect it to the receiver. The number of the sealing teeth is selected...

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Abstract

The invention provides an improved labyrinth and fingertip combined type seal structure which adopts a fingertip seal and a fingertip seal front baffle plate as main bodies, wherein the fingertip sealfront baffle plate is improved into a labyrinth seal structure, the fingertip seal comprises two high-pressure seal grade fingertip pieces and a low-pressure seal grade fingertip piece with a fingertip shoe, arc-shaped gaps are arranged on the fingertip pieces, the three fingertip pieces are fixed together, the front baffle plate is arranged in front of the high-pressure seal grade fingertip pieces, a rear baffle plate is arranged at the rear of the low-pressure seal grade fingertip piece with a fingertip shoe, and the labyrinth seal is a seal tooth which is inlaid in the front baffle plate.The labyrinth and fingertip combined type seal structure is used for axially sealing a mechanical rotor of an impeller and can effectively prevent the axial gas leakage of an engine; and if the direction of the seal tooth is changed, the labyrinth and fingertip combined type seal structure can be used for sealing holes.

Description

(1) Technical field [0001] The invention relates to a sealing structure, in particular to a labyrinth and fingertip combined sealing structure for axial sealing. (2) Background technology [0002] Due to the development of modern turbomachinery technology, the leakage of the seal has become one of the main factors affecting its performance. This requires that the new sealing form has better sealing characteristics and higher service life. [0003] Traditional sealing forms include grate (labyrinth) seals, brush seals, etc. Among them, brush seals are expensive and easy to wear, while labyrinth seals have a large amount of leakage. In recent years, new types of seals include fingertip seals and honeycomb seals, both of which have good sealing performance, especially fingertip seals can reduce wear and improve service life due to their better adaptability. But it is this easy-to-deform structure that makes it unable to withstand large pressure differences, and is not suitabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/447F01D11/02
Inventor 郑群岳国强张海
Owner HARBIN ENG UNIV
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