A fingertip seal
A fingertip seal, the other side of the technology, applied in the direction of machines/engines, leakage prevention, mechanical equipment, etc., can solve the problems of increasing fingertip seal leakage, reducing hysteresis, reducing frictional resistance, etc., to avoid hysteresis, reduce Hysteresis, leakage reduction effect
Active Publication Date: 2021-09-03
AECC SHENYANG ENGINE RES INST
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Problems solved by technology
[0004] One is to increase the stiffness of the fingertip seal so that the elastic recovery force of the fingertip seal is sufficient to overcome the frictional resistance caused by the seal pressure difference, but this solution will aggravate the friction between the fingertip seal and the rotor. Wear, affecting fingertip seal life
[0005] Another type of solution is to process a groove structure on the tailgate, and introduce the gas at the high-pressure end into the groove, thereby reducing the pressure difference between the two ends of the fingertip seal, achieving the effect of reducing frictional resistance, thereby reducing hysteresis, but this solution will Increases fingertip seal leakage, degrades fingertip seal performance
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[0018] In order to make the objectives, technical solutions and advantages of the implementation of the application clearer, the technical solutions in the implementation modes of the application will be described in more detail below with reference to the drawings in the implementation modes of the application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the present application. The embodiments described below by referring to the figures are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection of this application. Embodiments of the pr...
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The application belongs to the technical field of aero-engine sealing, and relates to a fingertip sealing device. The device includes a front baffle and a rear baffle, and a fingertip sealing sheet located between the front and rear baffles. The front baffle is located on the high-pressure gas side. A channel is formed between it and the fingertip seal, there is a cavity between the rear baffle and the fingertip seal, and the fingertip seal has a vent hole connecting the channel and the cavity, the vent hole is closed under the action of the slider, and the slider The spring force and the gas on the high-pressure side work together, so that when the pressure on the high-pressure side is too high, the high-pressure gas enters the air through the vent hole. In the case of low pressure difference, this application overcomes the frictional resistance through the elastic recovery force of the fingertip sealing sheet itself, and avoids hysteresis; form, reducing the pressure differential across the fingertip seal, which in turn reduces hysteresis.
Description
technical field [0001] The application belongs to the technical field of aero-engine sealing, in particular to a fingertip sealing device. Background technique [0002] As the performance of gas turbines continues to develop to new levels, the leakage of seals has become one of the main factors affecting engine performance. Fingertip seal is a new type of sealing technology developed after grate seal and brush seal. It has the advantages of low leakage rate and low manufacturing cost. Fingertip seal has hysteresis. The phenomenon that the frictional resistance generated between the tip seal and the fingertip seal and the tailgate will prevent the fingertip from returning to its original position. For the hysteresis of the fingertip seal, after years of technological development, a pressure-balanced fingertip seal structure has emerged. The disadvantage of this solution is that it will increase the leakage of the fingertip seal and reduce the sealing performance. How to eff...
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IPC IPC(8): F01D11/08
CPCF01D11/08
Inventor 张杰一孔令成
Owner AECC SHENYANG ENGINE RES INST