Nitrogen-rich air oxygen concentration detection device for airborne film separator

Abstract

The invention belongs to an air oxygen concentration detection technology and relates to a nitrogen-rich air oxygen concentration detection device for an airborne film separator. The device is characterized in that the device is composed of an oxygen concentration detection air circuit and an oxygen concentration signal processing circuit, wherein the oxygen concentration detection air circuit comprises an airborne film separator (2), a sampling pipeline (6), an oxygen concentration sensor (9), an absolute pressure reducer (7), a sealing airket (3), a filtering and flow limiting assembly and alocking screw ring (11), and the oxygen concentration signal processing circuit is composed of a DC / DC converter (13), an amplifier (14), an AD converter (15), a display encoder (16) and a comparator(17). The invention provides an oxygen concentration high-precision monitoring device for an aircraft fuel tank inerting system, by filtering impurities in oxygen-enriched air, limiting air flow andreducing air fluctuation and environmental height influence, mechanical and electrical integration monitoring is achieved, measurement precision is high, the response time is short, reliability is high, the service life is long, and the requirement for detecting the oxygen concentration of nitrogen-enriched air is met.

Description

technical field [0001] The invention belongs to gas oxygen concentration detection technology, and relates to a nitrogen-enriched gas oxygen concentration detection device for an airborne membrane separator. [0002] technical background [0003] The separators currently onboard can generate oxygen-enriched air from the aircraft's own compressed air source over a very long period of time. Passengers can thus be supplied with oxygen-enriched air not only during the descent of the aircraft but also during its temporary flight altitude. Such as: Chinese patent application CN1549785A (for the method and device of dispensing oxygen-enriched air for aircraft passengers) has announced that "separator 2 includes an output pipeline 8 and a pipeline 10, wherein, nitrogen-enriched air flows out from pipeline 8, Oxygen-enriched air flows in the pipeline 10. The pipeline 10 is provided with a sensor 12 to monitor the oxygen concentration of the oxygen-enriched air flowing through there."...

AI Technical Summary

Problems solved by technology

", while the domestic C919, ARJ21 and other passenger aircraft use the products of foreign companies such as Parker and Eaton in the nitrogen-enriched gas oxygen concentration detection device. Due to the undisclosed foreign technology, the current shortcomings of measuring the oxygen concentration of oxygen-enriched air are: 1. When the aircraft A first portion of oxygen-enriched air is delivered to passengers from a separate source 18 during descent between the cruising altitude and the temporary altitude, and from near the temporary altitude, at least during a generally stable flight of the aircraft, an onboard separator 2 to produce a second part of oxygen-enriched air delivered to passengers. The sensor 12 only detects the oxygen concentration of the oxygen-enriched air in the separator 2, and does not detect the oxygen concentration of the oxygen-enriched air in the independent source 18. It can be seen that the frequency of use of the sensor 12 is relatively small. The service life has not been fully verified; 2. The oxygen concentration detection structure disclosed in the Chinese patent application CN1549785A describes that the oxygen-enriched air of the separator 2 flows in the pipeline 10, and the pipeline 10 is provided with a sensor 12 to monitor the oxygen-enriched air flowing therethrough. Oxygen concentration of oxygen air, the disclosed structure is relatively simple; 3, the sensor 12 is affected by factors such as test gas cleanliness, pressure, flow rate, etc. during the test, the structure disclosed in Chinese patent application CN1549785A is difficult to meet reliability, service life and Requirements for test accuracy; 4. The gas sampled by oxygen-enriched air passes through the passenger cockpit, while the gas sampled by nitrogen-enriched gas passes through the ambient atmosphere at flight altitude, which is greatly affected by the altitude; 5. Due to the low oxygen content of nitrogen-enriched gas, The accuracy of the oxygen concentration sensor for testing oxygen content is required to reach 0.3%, while the current sensor for testing oxygen-enriched air can only meet the accuracy requirement of less than 2% due to various factors

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