High-pressure-resistant high-precision temperature sensor

Abstract

The invention discloses a high-pressure-resistant high-precision temperature sensor. The sensor comprises an outer protection tube, an inner protection tube, a junction box, an insulation support, a plurality of conducting wires and an insulation filler. The junction box is arranged at one end of the outer protection tube; a transmitter is arranged in the junction box; the transmitter is used forconverting a temperature signal into an output signal; the inner protection tube is inserted into the outer protection tube; the inner protection tube extends out of the other end of the outer protection tube to form a detection probe; the insulation support is arranged in the inner protection tube; and the plurality of conducting wires are arranged in the insulating support in an axial directionand are connected with the transmitter, the insulating support and the inner protection tube are isolated through the insulating filler, the conducting wires are provided with resistor bodies used fordetecting temperatures, and the resistor bodies are located at an end portion of the detection probe. The high-pressure-resistant high-precision temperature sensor provided by the invention is high in sensitivity, high in thermal response speed and accurate in detection result.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a high-pressure resistant high-precision temperature sensor. Background technique [0002] High temperature melt temperature sensor is mainly used for temperature measurement and control of molten material under high temperature conditions. High-temperature melt temperature sensors are widely used in the pressure measurement and control of high-temperature fluid media in chemical fiber plastics, spinning, polyester, rubber and plastic machinery and other equipment. High-temperature melt has the characteristics of high temperature, high pressure and high viscosity. The lower the temperature, the greater the viscosity, and it is usually solid at room temperature. The temperature change in the device containing the high-temperature melt is also directly related to the normal operation of the high-temperature furnace and the product quality. Since the device is actually a closed dis...

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Problems solved by technology

[0003] In the prior art, the temperature conductive wire used to detect the temperature of the temperature sensor is encapsulated in the detection probe through the potting process. Since the conductive wire is usually soft, the resistor at the end of the conductive wire of this design is usually connected to the end of the detection probe. There is a distance of 3-5mm at the top, and there are problems such as low sensitivity of the sensor, slow heat conduction, long response time, and large error in test results.

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