A temperature-measuring resistor that is not prone to temperature jumps

Abstract

The invention discloses a temperature measuring resistor with low possibility of temperature value jump. The temperature measuring resistor comprises a temperature measurement probe, the circumferenceof the front end of the temperature measurement probe is provided with forward threads, the circumference of the back end of the temperature measurement probe is provided with counter threads whose diameter is greater than that of the forward threads, an annular groove is arranged between the forward threads and the counter threads, the pitch of the forward threads equals that of the counter threads, the width of the annular groove is greater than the length of the forward threads, the temperature measurement probe is connected with a signal cable via a cable connector, the signal cable is composed of two signal lines, and the cable connector comprises an aviation plug connected with the temperature measurement probe and an aviation socket connected with the signal cable. The temperaturemeasuring resistor has the advantages that the detected temperature value tends not to jump, shutdown due to misoperation of a hydropower station set tends not to occur, a lot of detection and maintenance can be omitted, and the economic benefit of a hydropower station is increased.

Description

technical field [0001] The invention belongs to the field of temperature-measuring resistors for temperature detection of thrust bearing pads of hydropower station units, and in particular relates to a temperature-measuring resistor that is not prone to temperature value jumps. Background technique [0002] The high temperature of the thrust bearing pad of the hydropower station unit will lead to tile burning accidents, so the hydropower station unit is equipped with a monitoring system. When the temperature of the thrust bearing pad is higher than the fixed value, the monitoring system will act on the shutdown of the hydropower station unit to prevent the accident from expanding and causing equipment damage. damage. However, due to the harsh operating environment of the temperature measuring resistor used to detect the temperature of the thrust bearing pad in the monitoring system (high temperature, high heat, oil immersion, etc.), the temperature measuring resistor itself ...

AI Technical Summary

Problems solved by technology

The reasons for the failure of the temperature measuring resistance are as follows: 1. The temperature measuring probe is connected to the temperature measuring hole of the thrust bearing bush through a forward or reverse screw thread. When the temperature measuring probe is screwed into the temperature measuring hole, it will Drive the signal cable to twist, so that the signal cable is in a twisted state, which accelerates the aging of the signal cable, and the insulation layer of the signal cable is easily broken, which makes the copper core inside the signal cable exposed, which causes the temperature value to jump; 2. The signal cable is composed of two The signal cable is composed of two signal lines, and the signal cable is easy to become hard and brittle after long-term immersion in the oil tank of the thrust bearing, which will cause the insulation layer of the signal line to break and the copper core inside the signal line to be exposed, resulting in a short circuit or grounding phenomenon, causing a jump in temperature value; 3. The cable connector includes the aviation plug connected to the temperature probe and the aviation socket connected to the signal cable. The pin of the aviation plug is cylindrical, and the joint surface between the pin and the metal shrapnel on the aviation socket is small, and the bonding strength is not enough. , the vibration of the hydropower unit during operation will cause repeated disengagement and combination between the pin and the metal shrapnel, that is, the poor contact between the aviation socket and the aviation plug will also cause the temperature value to jump; 4. The signal line is lubricated in the oil tank for a long time Oil scours, the bottom of the oil tank has sharp metal shavings, and the metal shavings are easy to penetrate into the insulation layer of the signal line, causing the signal line to steal electricity, which will also cause the temperature value to jump

[0004] Therefore, the existing temperature-measuring resistors have the disadvantage that the detected temperature value is prone to jump, which may easily cause the hydropower unit to malfunction and stop, which increases a lot of detection and maintenance work, and also reduces the economic benefits of the hydropower station.

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