A Finned Low Hysteresis Contact Fingertip Seal

A fingertip sealing and contact technology, which is applied in the direction of leakage prevention, engine components, machines/engines, etc., can solve the problems of decreased sealing performance, increased sealing gap, and lagging recovery movement, etc., to achieve good high pressure difference tolerance, eliminate Effect of contact friction and elimination of hysteresis effect

Active Publication Date: 2018-04-20
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the friction between the low-pressure fingertip sheet and the rear baffle, when the rotor radially displaces, the fingertip sheet is pushed away from the initial position, and when the radial displacement of the rotor returns, the fingertip sheet The recovery movement of the rotor lags behind the recovery of the rotor, and even the phenomenon of "stuck" will appear, thereby increasing the sealing gap and causing the sealing performance to decline

Method used

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  • A Finned Low Hysteresis Contact Fingertip Seal
  • A Finned Low Hysteresis Contact Fingertip Seal
  • A Finned Low Hysteresis Contact Fingertip Seal

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] refer to figure 1 , a low-hysteresis contact fingertip seal with fins, including a contact fingertip seal that cooperates with the rotor 5, the contact fingertip seal is sequentially composed of a front baffle 1, a high-voltage fingertip sheet 2, a low-voltage fingertip There is a sheet-type fin 4 on the low-pressure fingertip sheet, and the fin 4 is located on the low-pressure side of the low-voltage fingertip sheet 3 .

[0018] The fins 4 and the low-voltage side surface of the fingertip beam of the low-voltage fingertip sheet 3 are arranged in a "T" shape, and the low-voltage fingertip sheet 3 and the fins 4 are integrally structured. The fin 4 is a strip-shaped thin leaf structure with a certain width, and the shape line in the length direction is the same as the fingertip beam shape line of the low-voltage fingertip sheet 3, such...

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Abstract

A low-hysteresis contact type fingertip seal with a fin comprises a contact type fingertip sealing device matched with a rotor. The contact type fingertip sealing device is formed by connecting a front baffle, a high-pressure fingertip sheet and a low-pressure fingertip sheet. The low-pressure fingertip sheet is provided with a fin structure, and the fin structure and the surface of the low-pressure side of a fingertip beam are arranged in a T-shaped mode. The fin structure has a certain width in the axial direction and accordingly can provide supporting force for resisting the front-back differential pressure for the fingertip sheet, so that the fingertip sheet is protected against axial deformation under the action of fluid pressure, and the fin structure plays a role in axially supporting a rear baffle in a conventional contact type fingertip seal. The rear baffle structure is omitted. The hysteresis effect caused by friction force between a low-pressure fingertip sheet and the rear baffle of the conventional contact type fingertip seal is reduced. The dynamic sealing performance of the contact type fingertip seal is improved.

Description

technical field [0001] The invention belongs to a contact sealing device for a rotating shaft, in particular to a low-hysteresis contact fingertip seal with fins. Background technique [0002] In turbomachinery, especially in aero-engines, it is often necessary to seal the fluid between the rotating part and the stationary part in order to reduce the leakage of working fluid and improve its working efficiency. The contact fingertip seal is a flexible rotor seal evolved from the brush seal. This new type of seal is similar to the brush seal in principle, and its sealing performance is equivalent to or even better than that of the brush seal, but the production cost is greatly reduced. When the rotor radially displaces and deviates from its original position, the flexible fingertip beam can flexibly deform under the extrusion of the rotor, and follow the radial runout of the rotor to generate lift, so that its sealing performance can be maintained at a better level . Howeve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D11/00
CPCF01D11/003
Inventor 李永健胡翔宇索双富黄伟峰郭飞王子羲高志王玉明
Owner TSINGHUA UNIV
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