A kind of multi-wire thermocouple and method for preventing thermocouple charge accumulation

Abstract

The invention discloses a multi-wire system thermocouple. The multi-wire system thermocouple comprises a plurality of positive thermal electrodes and a plurality of negative thermal electrodes, wherein one of the positive thermal electrodes and one of the negative thermal electrodes work in pairs, and one of the other positive thermal electrodes or the other negative thermal electrodes is selected to be grounded, and the rest of thermal electrodes are suspended; one end of each of the positive thermal electrodes and the negative thermal electrodes is connected together; and the thermocouple also comprises a shock absorber and a discharge comb which sleeve a thermocouple temperature measuring rod. According to the multi-wire system thermocouple of the invention, based on timely discharge and charge transfer, charges can be prevented from being accumulated the temperature measuring component to the greatest extent, and at the same time, charge generation quantity can be decreased from the source, and the interference of interference charges on temperature measuring potential can be eliminated from a plurality of channels.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to a method for preventing charge accumulation and a multi-wire thermocouple. Background technique [0002] A thermocouple is a temperature-sensing element that directly measures temperature and converts the temperature signal into a thermal electromotive force signal. In the current industrial environment, a large number of thermocouple thermometers with fast thermal response and simple structure are used. [0003] A thermocouple is actually an energy converter that converts thermal energy into electrical energy and uses the resulting thermoelectric potential to measure temperature. However, in a vibrating working environment, after the thermocouple works for a period of time, there will be a significant temperature measurement deviation; the thermoelectric potential maps the temperature process, as if there is some kind of error. [0004] In order to allow the te...

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Problems solved by technology

[0010] 2. The temperature measurement deviation of the thermocouple is mainly manifested in the fact that after the thermocouple has been working for a period of time, the temperature display value: ① will be significantly higher than the actual temperature value, or ② significantly lower than the actual temperature value, and ③ the displayed temperature value will suddenly rise and fall In these three cases, there is a phenomenon of sudden interference from the outside world.

[0013] As we all know, vibration brings friction between objects, which will generate triboelectric charge, and friction exists such as between the wire and the insulating layer, between the insulating layer and the armored shell, between the armored shell and the mechanical equipment, and the mechanical equipment Between the connecting piece..., the mixed friction charges of various types are called interference charges, and as the interference charges enter along the cracks of the MgO insulating layer, the event that the interference charges are directly superimposed on the thermocouple temperature measuring element occurs

[0014] In short, when the thermocouple thermometer is under vibration conditions, on the one hand, the insulating layer will gradually appear fine cracks due to repeated extrusion, and on the other hand, the vibration will also cause objects to rub against each other, resulting in interference charges; , after increasing and accumulating, it is bound to push up the electrostatic potential energy; once a sufficiently strong electric potential field passes through the crack, it is applied to the thermoelectric electrodes on one side or both sides of the thermocouple, causing a superimposed effect on the thermoelectric potential of the temperature measurement, forming a signal interference source, and subsequent The secondary display instrument cannot be distinguished at all, and a huge deviation of the detection value will occur.

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