Platinum rhodium thermal coupler

Abstract

The invention provides a platinum rhodium thermal coupler which comprises a junction box, an upper connecting pipe, a connecting nut, a flange connecting pipe, a flange, a protecting pipe, a corundum pipe connector, a first corundum pipe, a second corundum pipe and a platinum rhodium wire. The junction box, the upper connecting pipe, the flange connecting pipe and the protecting pipe are sequentially connected. A sealing piece and the corundum pipe connector are located in an inner cavity of the upper connecting pipe and sequentially arranged in the direction from the junction box to the flange connecting pipe and abut against each other. By means of the platinum rhodium thermal coupler, the protecting pipe, the first corundum pipe and the second corundum pipe are adopted outside the platinum rhodium wire to protect the platinum rhodium wire, the three pipes are sealed and fixed independently and are not prone to shaking or influencing one another, the heat transfer between the corundum pipes and the junction box is stopped through the sealing piece, the sealing performance is good, the temperature measuring accuracy is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of thermocouples, in particular to a platinum-rhodium thermocouple. Background technique [0002] At present, platinum-rhodium thermocouples, also known as high-temperature precious metal thermocouples, as temperature measurement sensors, are usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control various production processes. The temperature of fluid, steam and gas medium and solid surface in the range of 0-1800℃, due to the high temperature measured by the platinum-rhodium thermocouple, the tightness between the high-temperature part of the thermocouple and the junction box is very high. The wire of the wire needs to be introduced from the high temperature end to the low temperature end, and it is difficult to block the heat transfer between the heated part and the junction box, which affects the service l...

AI Technical Summary

Problems solved by technology

[0002] At present, platinum-rhodium thermocouples, also known as high-temperature precious metal thermocouples, are used as temperature measurement sensors and are usually used in conjunction with temperature transmitters, regulators, and display instruments to form a process control system to directly measure or control various production processes. The temperature of fluid, steam and gas medium and solid surface in the range of 0-1800°C, due to the high temperature measured by the platinum-rhodium thermocouple, the tightness between the high-temperature part of the thermocouple and the junction box is very high. The wire of the wire needs to be introduced from the high temperature end to the low temperature end, it is difficult to block the heat transfer between the heated part and the junction box, which affects the service life

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