A Fault Point Finding Method for Lubricating Oil Pressure Difference Alarm

A technology of false alarms and fault points, applied in the direction of engine testing, machine/structural component testing, instruments, etc., can solve problems affecting flight missions, hidden dangers of flight safety, endangering flight safety, etc., to avoid repetition and disorder The effect of simplifying labor, highly targeted experiments, and reducing labor intensity

Active Publication Date: 2019-03-01
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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  • A Fault Point Finding Method for Lubricating Oil Pressure Difference Alarm
  • A Fault Point Finding Method for Lubricating Oil Pressure Difference Alarm

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0063] Example 1: When the product was pressurized to the boost working point after returning to the factory, the alarm light and the non-alarm light were turned on at the same time, and the fault phenomenon reappeared many times in the factory. , By testing the contact gap, it is found that the contact gap is out of tolerance. It can be judged that the reason why the alarm light is not extinguished is that the gap between the contacts on the combination of the lever and the spring leaf is too small, causing the normally closed point on the switch part to not be completely disconnected, and the alarm light is not extinguished. Fault No. 1 is also the cause.

[0064] b. The characteristics of the capsule of the sensing part are out of tolerance

example 2

[0065] Example No. 2 faulty product returned to the factory to test the operating point is out of tolerance (requirement (kPa): step-down point I: 103.4±2.74, step-up point I+ΔI, ΔI: 4.8~8.92, measured value: step-up point 110.4kPa, step-down point The pressure point is 99.2kPa), the product is decomposed and the performance test is performed on the membrane of the sensing part, and it is found that the membrane properties of the sensor are out of tolerance, which causes the alarm light to not alarm when it is normally alarming.

[0066] c. Product welding quality problems

[0067] For example, the No. 3 faulty product returned to the factory for testing, and the fault recurred many times. Opening the meter inspection found that the welding wire was short-circuited; the No. 3 fault was also caused by poor contact of the socket due to welding quality problems, which caused the warning light to not alarm when it was normally alarming.

[0068] Corrective Action

[0069] In view...

Embodiment 1

[0074] Oil accumulation test in the contact cavity of the lubricating oil differential pressure annunciator:

[0075] Six tests were carried out, and it was finally verified that external oil vapor can enter the contact chamber of the lubricating oil differential pressure annunciator from the joint surface of the product shell and the joint between the cover plate and the shell. The six main trials are as follows:

[0076] ①Oil seepage test at room temperature—the product mounting base was immersed in lubricating oil for 295 hours at room temperature, and no oil entered the contact cavity.

[0077] ②Oil immersion test at room temperature——The product was immersed in lubricating oil for 90 hours except for the electrical socket at room temperature, and no oil entered the contact cavity.

[0078] ③Normal temperature pressurization test——pressurize (lubricating oil) 1Mpa in the high and low pressure chambers of the sensing part of the product, and at the same time simulate the w...

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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

【Technical field】 [0001] The invention belongs to a method for troubleshooting an aero-engine, in particular to a method for finding a fault point for lubricating oil pressure error alarm. 【Background technique】 [0002] Engine lubricating oil differential pressure alarm failure rate 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 differential pressure annunciator, and the sensing part of the lubricating oil differential pressure annunciator senses the pressure difference between the lubricating oil supply pressure of the engine and the oil return pressure of the gearbox. When the pressure difference is less than or less than A kg / cm 2 , the annunciator contacts are closed, turning on the red warning light in the cockpit of the aircraft. During the engine starting process, when the high-pressure engine speed rises to a certain...

Claims

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Application Information

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Patent Type & Authority Patents(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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