Retractable electrode for tungsten rhenium thermocouple calibration device

Abstract

The invention relates to a telescopic electrode for a tungsten rhenium thermocouple calibration device, which comprises an electrode, wherein the electrode sequentially passes through an insulating sliding seat, a round seat, a corrugated pipe, a transition cap, an insulating ring and a transition ring; one end of the corrugated pipe is welded with the round seat, and the other end of the round seat is connected with the insulating sliding seat; the other end of the corrugated pipe is welded with the transition cap, the other end of the transition cap is welded with the insulating ring, and the other end of the insulating ring is welded with the transition ring; and the other end of the transition ring is welded and fixed on the electrode. The telescopic electrode fully can meet the requirements that the temperature of a tungsten tube reaches 3,000 DEG C, and the expansion amount reaches 20 millimeters to the maximum. A telescopic component, namely the corrugated pipe works in a non-high temperature state, which prolongs the service life.

Description

technical field [0001] The invention relates to a stretchable electrode, in particular to a stretchable electrode for a tungsten-rhenium thermocouple calibration device. Background technique [0002] The melting point of tungsten-rhenium thermocouple wire is 3120-3360°C, and the maximum operating temperature is 3000°C. [0003] Many scientific research institutions in China have developed tungsten-rhenium thermocouple calibration devices. For example, China Institute of Atomic Energy, Chongqing Institute of Instrument Materials and other technical institutions have developed high-temperature calibration equipment for tungsten-rhenium thermocouples. The temperature range of the calibration equipment developed by the Chongqing Instrument Materials Research Institute is 1200°C to 2350°C; the temperature range of the calibration equipment developed by the China Institute of Atomic Energy is from room temperature to 2900°C. In fact, the lower limit of the temperature of the stand...

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Problems solved by technology

The melting point of tantalum is about 2900°C. Obviously, the upper temperature limit of the tungsten-rhenium thermocouple calibration device using this structure is 2900°C. In addition, this structure has another disadvantage, that is, there is a sliding contact between the tungsten tube and the tantalum sleeve. If you want to make the sliding resistance small, you must make the contact not too close, resulting in poor electrode contact, which will easily increase the contact resistance, increase the local power, increase the temperature, and even cause local melting in severe cases; if the electrical contact is good, it will inevitably cause sliding. Increased resistance

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