Triplex backup temperature measurement sensor

Abstract

The invention discloses a triplex backup temperature measurement sensor, and aims to provide a triplex redundancy backup total temperature sensor capable of improving the reliability and reducing thevolume and weight of the sensor. The triplex backup temperature measurement sensor is implemented according to the technical scheme that an inner tube of a double-layer sealed metal exploring tube ofa coaxially connected temperature sensing sensor penetrates through a metal throat of the temperature sensing sensor, and then is fixedly connected to a tail cover at the rear end and packaged in a mutually independent air flow channel of a metal outer tube; and three platinum wires wound on an electric conductor winding cylinder lead out six platinum wire taps which are connected to bent joint connecting pieces and leading-out wires, an air flow passes through a tube cylinder annular hole of the metal outer tube and the electric conductor winding cylinder and flows to the inner tube wall of the double-layer sealed metal exploring tube via a probe measuring end, the air flow is transformed into a sound velocity air flow by means of a Laval principle of the metal throat, the kinetic energyof the air flow is converted into a corresponding triplex backup resistance signal, and the triplex backup resistance signal is provided for an engine control system and converted into a triplex redundancy electric signal for three channels.

Description

technical field [0001] The invention relates to a device that can be widely used in the fields of meteorology, automobiles, aviation, industrial automation measurement and various experimental instruments and meters, and uses the characteristics of element resistance parameters changing with temperature to detect temperature and temperature-related parameters. Especially the three-redundancy total temperature sensor used for engine inlet temperature measurement. Background technique [0002] The sensors of the engine control system have a high failure rate because they work in the harsh environment of high temperature, high pressure and strong vibration, and their reliability plays a decisive role in the normal operation of the entire control system. At present, the aero-engine control system usually adopts a dual-redundancy structure or a dual-redundancy plus protection channel structure, which has two channels that are identical and independent of each other. The two chann...

AI Technical Summary

Problems solved by technology

According to the different lead wire methods of temperature measuring sensors, platinum resistors are divided into three types: two-wire system, three-wire system and four-wire system. The three lead wire methods have their own characteristics. The two-wire lead wire method has simple leads, but the problem is that the measurement error is large. , it is inevitable to introduce line resistance error in the measurement, and it is only suitable for occasions where the measurement accuracy is not high

The cost of the four-wire platinum resistance sensor is relatively high, and the calculation formula is required to calculate Vout=K×I×R×(R-RT) / (3×R+RT+2r)

If the resistance value of the resistance to be measured is equivalent to the resistance of the wire, or even much smaller than the resistance of the wire, only the four-wire measurement method can be used. This method has high measurement accuracy, but this method requires the sensor to generate 4 leads for long-distance transmission. The process will increase the cost and the weight of the entire test system, which cannot meet the requirements of some special industries, and is mainly used for high-precision temperature detection

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