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Lubricating oil pressure difference false alarm fault point searching method

A technology of false alarms and fault points, which is applied in the direction of engine testing, machine/structural component testing, and measuring devices, can solve problems such as flight safety hazards, affecting flight missions, and endangering flight safety, so as to achieve strong test pertinence, Avoid repetitive and disordered labor and reduce labor intensity

Active Publication Date: 2017-02-22
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3) When the warning light turns from off to on during the normal operation of the engine, the failure will affect the completion of the flight mission. If it is not handled properly, it will also cause safety hazards to the flight. According to regulations, the engine must be stopped in the air, endangering flight safety.

Method used

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  • Lubricating oil pressure difference false alarm fault point searching method
  • Lubricating oil pressure difference false alarm fault point searching method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068] Example No. 1 When the product is pressurized to the boosting working point after returning to the factory, the alarm light and the non-alarm light are turned on at the same time, and the fault phenomenon has been repeated many times in the factory, and the fault phenomenon has not appeared. , the contact gap is found to be out of tolerance by testing the contact gap. It can be judged that the reason why the alarm light does not go out is that the gap between the contacts on the combination of the lever and the spring sheet is too small, which causes the normally closed point on the switch component to not be completely disconnected, and the alarm light does not go out. Fault No. 1 is also the reason.

[0069] b. The characteristics of the capsule of the sensory part are too poor

example 2

[0070] Example No. 2 The faulty product returned to the factory for test work point out of tolerance (requirement (kPa): step-down point I: 103.4±2.74, boost point I+ΔI, ΔI: 4.8~8.92, measured value: boost point 110.4kPa, drop The pressure point is 99.2kPa), the product is decomposed and the performance test of the sensor film is carried out. It is found that the sensor film is out of tolerance, so that the alarm light does not alarm when it is a normal alarm.

[0071] c. Product welding quality problems

[0072] Example No. 3, the faulty product returned to the factory for testing, and the fault recurred many times, and the welding wire was found to be short-circuited by opening the meter; the No. 3 fault was also due to the poor contact of the socket due to the welding quality problem, so that the alarm light did not alarm when it was a normal alarm.

[0073] Corrective Action

[0074] In view of the faults caused by the out-of-tolerance contact gap, out-of-tolerance charac...

Embodiment 1

[0079] Oil accumulation test in the contact cavity of the lubricating oil differential pressure annunciator:

[0080] Six tests were carried out, and it was finally verified that the external oil vapor could enter the contact cavity of the lubricating oil differential pressure signal from the joint surface of the product and the joint of the cover plate and the casing. The six main trials are as follows:

[0081] ①Room temperature oil leakage test - immerse the product mounting seat in lubricating oil for 295 hours at room temperature, and no oil enters the contact cavity.

[0082] ②Room temperature oil immersion test - immerse the product in lubricating oil for 90 hours at room temperature except for the electrical socket, and no oil enters the contact cavity.

[0083] ③Pressure test at room temperature - pressurize (lubricating oil) 1Mpa for each of the high and low pressure chambers of the sensing part of the product, and at the same time simulate the working state of the ...

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Abstract

The invention provides a lubricating oil pressure difference false alarm fault point searching method. The method includes performing airplane ground electrical line inspection after eliminating the airplane maneuvering flight faults, drawing a fault tree, and performing verification and checking according the fault tree; checking a lubricating oil pressure difference signal device; 3.2) checking the lubricating oil; performing the contrast test of different types of lubricating oil on the engine and eliminating the faults caused by the pressure of the different types of lubricating oil; performing classification analysis to determine the fault points of the faults; and for the reasons of the fault points, taking measures to eliminate the faults. The method of the invention improves the accuracy and effectiveness of the fault diagnosis, reduces the over-reliance on the operators' level in the fault analysis and fault positioning carried in the product testing process, and prevents repeated and disordered work, thereby reducing the labor intensity, and improving the work efficiency.

Description

[0001] 【Technical field】 [0002] The invention belongs to a method for an aero-engine troubleshooting test, in particular to a method for finding fault points for false alarm of lubricating oil pressure difference. [0003] 【Background technique】 [0004] The failure rate of the engine oil pressure difference alarm is high. After analysis and test verification, there are many reasons for the alarm. In order to monitor the operation of the lubricating oil system, the engine is equipped with a lubricating oil pressure differential signal device, and the sensing part of the lubricating oil pressure differential signal device senses the pressure difference between the oil supply pressure of the engine and the return oil pressure of the gearbox. When the differential pressure is less than or less than A kg / cm 2 When the annunciator contacts are closed, the red warning light in the cockpit of the aircraft is turned on. In the process of starting the engine, when the high pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00
CPCG01M15/00
Inventor 梁明莉杨薇郭晓强马峰贺孝涛丁伟闫庆安文红武
Owner AECC AVIATION POWER CO LTD
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