Armored thermometer for reactor coolant pump

Abstract

The invention belongs to the technical field of temperature measurement, and particularly relates to an armored thermometer for a reactor coolant pump. According to the armored thermometer, a Pt100 thermal resistor is connected with one end of a four-core lead through welding, wherein the Pt100 thermal resistor is packaged in a metal protective sleeve; the other end of the four-core lead extends out of the metal protective sleeve and is positioned in an armored outer protective layer; a cold end connector and a polytetrafluoroethylene outer protective layer; the outer wall of the metal protective sleeve is sleeved with a spring sleeve; one end of the spring sleeve is limited through a step on the outer wall of the metal protective sleeve, and the other end of the spring sleeve is pressed through an mounting bolt; a buffering effect is achieved in a vibration environment; the rear end of the armored outer protective layer is connected with the cold end connector; and the rear end of thecold end connector is connected with the polytetrafluoroethylene outer protective layer. The armored thermometer has the advantages of being resistant to vibration, resistant to lubricating oil scouring, resistant to mechanical equipment collision, resistant to oil, convenient to coil and fix and the like, and can be widely applied to temperature measurement of other pump body bearing bushes.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, in particular to an armored thermometer used for reactor coolant pumps. Background technique [0002] The reactor coolant pump of a nuclear power plant unit is a vertical two-speed three-phase squirrel-cage asynchronous motor produced in Russia. In order to monitor the operation of the motor bearing bush in real time, three thermometers are installed on the upper guide bush and the lower guide bush of the motor respectively. The bearing bush is equipped with 5 thermometers. The thermometer adopts an ordinary PT100 thermal resistance with a full polytetrafluoroethylene outer protective layer. The temperature sensing probe of the thermometer is installed on the bearing bush, and the lead wire passes through the reserved through hole of the motor and extends to the outside of the bearing chamber. Due to the operation of the reactor coolant pump The vibration frequency is very high, ...

AI Technical Summary

Problems solved by technology

The thermometer adopts an ordinary PT100 thermal resistance with a full polytetrafluoroethylene outer protective layer. The temperature sensing probe of the thermometer is installed on the bearing bush, and the lead wire passes through the reserved through hole of the motor and extends to the outside of the bearing chamber. Due to the operation of the reactor coolant pump The vibration frequency is very high, and the front part of the thermometer is immersed in the lubricating oil in the bearing chamber to withstand the erosion of the lubricating oil for a long time, which leads to problems such as broken wires of the thermometer and oil leakage of the outer protective layer of PTFE, which affects the Safe and Stable Operation of Reactor Coolant Pumps

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