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Vane seal with clearance control

A technology for controlling functions and sealing devices, applied in the direction of preventing leakage, engine components, machines/engines, etc., which can solve problems such as expansion of sealing gaps and inability to adjust sealing gaps

Active Publication Date: 2016-04-06
NANJING TIANCHENGHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional technical solution is mainly based on the grate tooth seal. The sealing gap cannot be adjusted during the operation of the equipment. Only a large enough sealing gap can only be reserved during the installation and commissioning stage. Theoretically, it is guaranteed that the equipment will not be rubbed in any state
However, in practical applications, high-speed rotating machinery still often encounters some unpredictable transient vicious conditions. The grate seals are rubbed for a short time, and the seal gap will be permanently enlarged.

Method used

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  • Vane seal with clearance control
  • Vane seal with clearance control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Vane type sealing device with gap control function, including upstream ring, vane assembly, downstream ring, control ring, retractor and drive system; vane assembly is embedded between upstream ring and downstream ring; control ring is adjacent to downstream ring; telescoping One end of the actuator is connected to the stator, and the other end is connected to the control ring; the drive system can drive the retractor to expand and contract.

[0059] There are 4 above-mentioned expanders evenly distributed along the circumference of the sealing device, which are respectively located at the upper, lower, left, and right positions. The length of the expander is adjusted according to the gap measurement, and the sealing gap at the corresponding position can be adjusted respectively. There is basically a linear relationship between the amount of change in the length of the expander and the adjustment amount of the sealing gap.

[0060] The expander is a cavity structure wit...

Embodiment 2

[0068] It is basically the same as Example 1, except that the expansion joint of the expander is convex; the angle between the two adjacent slits of the shielding sheet is 3°, and the two shielding sheets are stacked, and the slits Stagger each other. Along the rotation direction of the rotor, the radial angle between the blade element and the rotor is 30°; along the axial flow direction, the axial angle between the blade element and the rotor is 20°; the free end of the blade element and the downstream ring There is an axial gap of 0.5mm between them. The thickness of the blade element is 0.08mm, the thickness of the spacer is 0.03mm, and the thickness of the shroud is 0.1mm.

[0069] After calculation, using the above design parameters, the sealing gap is reduced by about 0.14mm for every 0.1mm extension of the expander, and the adjustable amount of the sealing gap is about 0.7mm.

Embodiment 3

[0071] It is basically the same as in Embodiment 1, except that the included angle between two adjacent slits of the shroud is 30°; along the rotation direction of the rotor, the radially included angle between the blade element and the rotor is 52°; Along the axial airflow direction, the axial angle between the blade element and the rotor is 27°; there is an axial gap of 0.6mm between the free end of the blade element and the downstream ring; the thickness of the blade element is 0.3mm, and the thickness of the spacer is 0.1mm, and the thickness of the shutter is 0.5mm.

[0072] After calculation, using the above design parameters, the sealing gap is reduced by about 0.17mm for every 0.1mm of expansion of the expander, and the adjustable amount of the sealing gap is about 1mm.

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PUM

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Abstract

The invention discloses a blade type sealing device having a clearance control function. The blade type sealing device having the clearance control function is installed on stators which are arranged at the periphery of a rotor and comprises an upstream ring, a blade assembly, a downstream ring and a control ring; the blade assembly is arranged between the upstream ring and the downstream ring; the control ring is adjacent to the downstream ring. The blade type sealing device having the clearance control function has the advantages of being applied to various rotary machinery and particularly applied to devices such as an aircraft engine and a gas turbine, rapidly responding to device states and adjusting sealing clearance, allowing a sealing device and the rotor being in collision for a short time and not influencing the sealing performance and enabling the devices to operate in an economic state for a long time.

Description

technical field [0001] The invention relates to a vane type sealing device, which is especially suitable for high-speed rotating machines such as aero-engines and gas turbines. Background technique [0002] Sealing technology plays a very important role in modern industrial production and scientific and technological development. Whether it is to improve the development of science and technology and the level of industrial production technology, or in terms of technological transformation and equipment transformation and renewal, sealing technology occupies an important position and plays an important role. Here, an aero engine is taken as an example to illustrate the importance of sealing technology. [0003] As we all know, no matter for military aeroengine or civil aeroengine, sealing technology directly affects the performance of the engine. The leakage of the main channel air flow directly affects the efficiency of each engine component; and for the air system, the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D11/22
Inventor 石伟伟韦红旗王丽丽
Owner NANJING TIANCHENGHENG TECH CO LTD