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Platinum-iridium alloy type ignition electric nozzle for aero-engine

An aero-engine and platinum-iridium alloy technology, which is applied in the direction of machines/engines, mechanical equipment, gas turbine devices, etc., can solve the problems of corrosion and deformation of the center electrode of the ignition nozzle, hidden dangers of the engine ignition system and engine safety, and improve the anti-oxidation performance , saving economic cost, high hardness effect

Inactive Publication Date: 2017-05-17
天津航空机电有限公司
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AI Technical Summary

Problems solved by technology

When the high trigger voltage and high-energy pulse generated by the ignition device act on the ignition nozzle, the high-energy electric spark will cause the electrode and side electrode of the ignition nozzle to undergo electric corrosion. The center electrode of the nozzle will be corroded and deformed, which will cause certain safety hazards to the engine ignition system and the normal operation of the engine

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  • Platinum-iridium alloy type ignition electric nozzle for aero-engine
  • Platinum-iridium alloy type ignition electric nozzle for aero-engine

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Embodiment Construction

[0019] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] see figure 1 . In the structural diagram of the ignition nozzle in the figure, there are center electrode 1 , electrode 2 , sealing wire 3 , side electrode 4 , shell 5 , porcelain tube 6 , and shell 7 . Since the ignition nozzle is used in a high-temperature and high-pressure environment and is also subject to fuel corrosion, the requirements for the electrode material are very high, so the platinum-iridium alloy material with strong oxidation resistance and corrosion resistance is selected. Because 95% alumina ceramics has a high dielectric constant and anti-corona performance, the inner porcelain tube 6 mainly relies on 95% alumina ceramics as an insulating medium. The high temperature glass glue is filled in the rear end of the porcelain tube 6 and the shell 7, and the internal parts of the product are sintered into one body to pre...

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Abstract

The invention belongs to the technical field of ignition systems of aero-engines and relates to material improvement and structure improvement on ignition electric nozzles in the ignition systems of the aero-engines, in particular to a platinum-iridium alloy type ignition electric nozzle for the aero-engine. The platinum-iridium alloy type ignition electric nozzle for the aero-engine comprises an electrode, a sealing-in wire, a shell, a side electrode, a porcelain tube and an outer shell. A center electrode is connected with the electrode through threads and fixed to the electrode through laser welding. The electrode is welded to the sealing-in wire through argon arc welding. The center electrode is made of platinum-iridium alloy. The center electrode, the electrode and the sealing-in wire are welded and then form a whole. The platinum-iridium alloy type ignition electric nozzle for the aero-engine has the advantages of being high in melting point (about 1850 DEG C), high in hardness, high in corrosion resistance, low in contact resistance, good in processing performance and the like, the service life of the platinum-iridium alloy type ignition electric nozzle for the aero-engine is prolonged to a certain extent, and the oxidation resistance of the platinum-iridium alloy type ignition electric nozzle for the aero-engine is improved to a certain extent. The platinum-iridium alloy type ignition electric nozzle for the aero-engine is suitable for high-voltage high-energy ignition systems.

Description

technical field [0001] The invention belongs to the technical field of ignition systems of aero-engines, and relates to material improvement and structure optimization of an ignition tip in an aero-engine ignition system, in particular to a platinum-iridium alloy ignition tip for an aero-engine. Background technique [0002] In the ignition system of an aero-engine, the most commonly used material for the center electrode of the ignition nozzle is a superalloy, which is widely used because of its low cost and high cost performance. However, with the continuous increase of engine thrust-to-weight ratio, higher requirements are placed on the temperature resistance and service life of engine ignition contacts. Traditional ignition contacts are generally only suitable for ignition systems with low trigger voltage and relatively small spark energy. When the high trigger voltage and high-energy pulse generated by the ignition device act on the ignition nozzle, the high-energy elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02C7/266
CPCF02C7/266
Inventor 陈艳武吴恩会邵跃夏国斌程蕾程大强
Owner 天津航空机电有限公司
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