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Fingertip seal structure and back baffle plate thereof

A fingertip seal and tailgate technology, which is applied to engine seals, engine components, mechanical equipment, etc., can solve problems such as loss of sealing performance, and achieve good sealing performance, low leakage characteristics, and large economic benefits.

Active Publication Date: 2011-09-14
CHINA GAS TURBINE ESTAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the present invention: In order to solve the problem that the prior art fingertip seal structure will cause the loss of sealing performance when reducing the sealing hysteresis, the present invention provides a sealing performance while reducing or eliminating the sealing hysteresis Fingertip seal structure

Method used

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  • Fingertip seal structure and back baffle plate thereof
  • Fingertip seal structure and back baffle plate thereof
  • Fingertip seal structure and back baffle plate thereof

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Embodiment Construction

[0026] The present invention will be described in further detail below by means of specific embodiments:

[0027] see figure 1 , which is a structural schematic diagram of a preferred embodiment of the fingertip sealing structure of the present invention. In this embodiment, the fingertip sealing structure is composed of a front baffle 1, a rear baffle 2 and five layers of fingertip sheets 3 arranged between them, wherein the front baffle 1, the rear baffle 2 And the fingertip piece 3 is an annular plate structure, connected with each other by riveting or welding.

[0028] Please also see figure 2 with image 3 ,in, figure 2 It is the front view of the fingertip sheet of the fingertip sealing structure of the present invention, image 3 yes figure 2 A partial enlargement of the . The inner diameter of the fingertip sheet 3 is provided with a finger body with an involute gap, and two adjacent finger bodies near the inner diameter form a sealing shoe. At the same time...

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Abstract

The invention relates to a fingertip seal structure and a back baffle plate thereof. The fingertip seal structure comprises a front baffle plate (1), a back baffle plate (2) and a plurality of layers of fingertip sheets (3) arranged between the front baffle plate and the back baffle plate, wherein each fingertip sheet is provided with a finger body (6) being a gap form the inner diameter position, and the finger bodies (6) between adjacent fingertip sheets (3) are mutually staggered. A plurality of arc-shaped pressure balance chambers (4) are arranged in the back baffle plate (2), the shape and the arrange means of the arc-shaped pressure balance chambers are consistent with the finger bodies (6), and the width is not larger than that of the finger bodies (6). Space exists between the arc-shaped pressure balance chambers (4) and the inner diameter of the back baffle plate (2), and at the same time the arc-shaped pressure balance chambers (4) are provided with through holes (5) communicated with the back baffle plate (2). The fingertip seal structure eliminates sealing lag and at the same time still can prevent the high-pressure gas in the arc-shaped pressure balance chambers from directly leaking to a low-pressure chamber, so the fingertip seal structure has good sealing performance.

Description

technical field [0001] The invention relates to a fingertip sealing structure and a tailgate. Background technique [0002] Conventional fingertip seals have a "hysteresis" characteristic in sealing performance. When the sealing pressure difference remains constant, the sealing performance of the fingertip seal can be maintained at a relatively low level during the rising speed stage, but when the rotor speed decreases, the sealing performance of the fingertip seal will drop significantly the trend of. This trend will only stop when the sealing pressure drop is sufficiently small. This "hysteresis" characteristic is due to the centrifugal expansion and thermal expansion of the rotor pushing the fingertip sheet away from the initial position, when the centrifugal expansion and thermal expansion are reduced or eliminated, the friction between the fingertip sheet and the tailgate hinders the fingertip The pointed piece returns to its original position, thereby forming a larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/16F16J15/34
Inventor 罗健周连杰胡海涛汪凯吴瑕徐鹏飞赵亚飞
Owner CHINA GAS TURBINE ESTAB
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