Self-pumping hydrodynamic pressure fingertip sealing device

A technology of fingertip sealing and hydrodynamic pressure, which is applied to engine components, machines/engines, and leakage prevention, and can solve problems such as high leakage rate, poor adaptability to rotor precession, and large wear

Active Publication Date: 2017-09-08
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this technology is to provide a self-pumping hydrodynamic pressure fingertip seal device with hydrodynamic pressure and sealing ability in the running state, and a small or even no le...

Method used

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  • Self-pumping hydrodynamic pressure fingertip sealing device
  • Self-pumping hydrodynamic pressure fingertip sealing device
  • Self-pumping hydrodynamic pressure fingertip sealing device

Examples

Experimental program
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Embodiment Construction

[0093] The implementation of the present technology will be described in detail below in conjunction with the drawings and examples.

[0094] refer to figure 1 , a self-pumping fluid dynamic pressure fingertip seal device, which is composed of a tailgate 4, a low-pressure fingertip seal 2, a high-pressure fingertip beam 1 with a fingertip shoe 9 and a rotor 5, and a high-pressure fingertip shoe with a fingertip shoe 9 The fingertip beam 1, the low-voltage fingertip seal 2, and the tailgate 4 are sequentially stacked from high pressure to low pressure and connected together by rivets, and are covered on the rotor 5. The fingertip boot 9 of the high-voltage fingertip beam 1 is provided with a A drainage hole 11 with a diameter of d and an inner ring groove 10 with a width of t, and a spiral groove 7 is processed on the surface of the rotor 5 .

[0095] The drainage hole 11 is opened on the fingertip shoe 9 , close to the high-voltage fingertip beam 1 in the axial direction of t...

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Abstract

The invention provides a self-pumping hydrodynamic pressure fingertip sealing device which has hydrodynamic pressure and sealing ability in a running state and has the low leakage rate in a stopped state, so as to overcome the deficiency of the high leakage rate or the great abrasion loss caused by the fingertip sealing retardation effect and poor rotor precession adaptability. The self-pumping hydrodynamic pressure fingertip sealing device consists of a rear baffle, a low-pressure fingertip sealing sheet, a high-pressure fingertip beam with a fingertip boot, and a rotor; the high-pressure fingertip beam with the fingertip boot, the low-pressure fingertip sealing sheet and the rear baffle are stacked from high pressure to low pressure side sequentially and are connected through rivets so as to form a ring which sleeves the rotor; the fingertip boot and the rotor form a sealing interface; a drainage hole and an internal ring groove are formed in the fingertip boot; a spiral groove is formed in the surface part of the rotor; the drainage hole communicates with the internal ring groove; the spiral groove and the internal ring groove are opposite in the radial direction; and when the rotor rotates, a fluid on the high pressure side is pumped to the sealing interface via the drainage hole, the internal ring groove and the spiral groove so as to form hydrodynamic pressure to push the fingertip boot away, thereby avoiding frictional wear between a fingertip and the rotor.

Description

technical field [0001] This patent belongs to the field of sealing technology, and particularly relates to a fingertip seal with fluid self-circulation dynamic pressure effect, which is suitable for high-speed, nutating axial displacement and precessing radial displacement, and gases with high working life requirements. Medium sealing occasions. Background technique [0002] Sealing technology plays a very important role in gas turbines and aero engines. Advanced sealing technology can effectively reduce the fuel consumption rate and flight cost of the engine while improving the performance and life of the engine. The main types of seals currently used in aero-engines are grate seals, brush seals, and graphite floating ring seals. With the continuous improvement of the performance of aero-engines, traditional sealing methods, such as grate seals, have been difficult to meet its multiple requirements in terms of work efficiency, thrust-to-weight ratio, fuel consumption, rel...

Claims

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Application Information

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IPC IPC(8): F01D11/00
CPCF01D11/00
Inventor 孙见君张凌峰马晨波张玉言於秋萍
Owner NANJING FORESTRY UNIV
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