A redundant metal skeleton platinum resistance temperature sensing element and its manufacturing method

Abstract

A multi-redundant metal framework platinum resistor temperature sensing element specifically comprises a hollow metal framework which is provided with an Al2O3 insulation coating. One end of the metal framework is trumpet-shaped, and the periphery of the other end is provided with a plurality of silver lug plates uniformly distributed along the circumferential direction. Each silver lug plate is connected with a lead-out wire, and the periphery of the silver lug plates is wound with an alkali-free glass fiber rope. The metal framework is wound with a platinum wire. The periphery of the platinum wire and the alkali-free glass fiber rope is coated with a high-temperature-resistant insulation sealing coating. A manufacturing method comprises the following steps: a metal framework stamping step, a surface cleaning step, an Al2O3 insulation coating applying step, a platinum wire winding step, a debugging and spot-welding step, a binding step, and a sealing step. By applying air and fuel-lubricating oil temperature sensors assembled by the temperature sensing element of the invention, as a measured medium can flow through the inner and outer surfaces of the metal framework, the conduction area of the medium is increased greatly. Because the framework adopts a metal pipe structure, the thermal conduction coefficient is increased, the conduction thickness is decreased, and the sensor time constant is increased greatly.

Description

technical field [0001] The invention relates to a redundant metal skeleton platinum resistance temperature sensing element, in particular to a redundant metal skeleton platinum resistance temperature sensing element and a manufacturing method thereof, belonging to the technical field of temperature sensing elements. Background technique [0002] Due to its high temperature measurement accuracy and long-term stability, the thermal resistance temperature sensor is widely used to measure the temperature of the medium in areas such as aero-engine fuel oil, fan inlet, and compressor inlet. The temperature-sensing elements of traditional thermal resistance temperature sensors include: platinum resistors wound around mica skeletons, platinum resistors wound around ceramic skeletons, thin-film platinum resistors with ceramic skeletons, and platinum resistors wound around glass skeletons. These platinum resistors are all made of mica, ceramic Non-metallic materials with high dielectr...

AI Technical Summary

Problems solved by technology

The temperature-sensing elements of traditional thermal resistance temperature sensors include: platinum resistors wound around mica skeletons, platinum resistors wound around ceramic skeletons, thin-film platinum resistors with ceramic skeletons, and platinum resistors wound around glass skeletons. These platinum resistors are all made of mica, ceramic Non-metallic materials with high dielectric strength, such as glass and glass, are used as platinum wire temperature-sensing materials to wind the skeleton, which effectively solves the dielectric index requirements for sensor insulation. characteristics, so that the response time and structural reliability of the sensor cannot be greatly improved

With the development of my country's aero-engines in the direction of large propulsion ratio and high reliability, it is difficult for traditional platinum resistance temperature sensors to meet the high reliability and high performance requirements of aero-sensors.

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