High-precision temperature sensitive probe

Abstract

The invention discloses a high-precision temperature sensitive probe, which comprises a temperature sensitive wire on a probe part, a wire which is connected with the temperature sensitive wire and used for transmitting an electrical signal, a protective sleeve, a probe protecting layer arranged outside the temperature sensitive wire on the probe part, and a temperature sensitive material filled between the temperature sensitive wire and the probe protective layer, wherein the wire passes through the inside of the protective sleeve; and the probe protecting layer is connected with the protective sleeve through a sealing ring. In the invention, by adopting the novel packaging and isolation technology, the temperature sensing delay caused by the protective sleeve and a packaging material iseliminated, the interference of environmental temperature with the heat transfer of a temperature sensitive element is blocked, that the probe only bear the action of the temperature field of measured fluid is ensured, the temperature measured by the probe is the current accurate temperature of the measured fluid, the temperature measurement precision is high, and the reaction speed is high. The technology is particularly suitable for use on high temperature measurement precision and quick fluid temperature change occasions, such as measurement of temperature of fluid in cavity and circulating fluid.

Description

technical field [0001] The invention relates to the technical field of temperature detection, in particular to a high-precision temperature-sensing probe suitable for the temperature measurement requirements of high temperature measurement accuracy and rapid change of fluid temperature. Background technique [0002] Temperature is a physical quantity that expresses the degree of hot or cold of an object, and is one of the most common and important thermal parameters in industrial production and scientific experiments. There are two methods of measuring temperature: contact measurement and non-contact measurement. Contact measurement is to select a certain medium to be in contact with the measured object, and conduct heat exchange. When the two reach a thermal equilibrium state, by measuring the relevant physical quantities of the medium (such as the volume of the liquid, the thermoelectric potential of the thermocouple, the resistance of the conductor, etc.), Obtain the phy...

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Problems solved by technology

[0003] People have made a lot of explorations and innovations for temperature, an important and common parameter, but many factors restrict the accuracy of temperature detection, for example: the metal temperature probe part of the traditional probe is embedded in the protective sleeve and is not directly connected to the outside world. Contact, coupled with some external environment temperature interference in signal transmission, will inevitably produce certain measurement errors; and the temperature of the protective sleeve and the temperature measurement medium are often inconsistent, and the protective sleeve will dissipate heat or absorb heat under the action of temperature difference, thus This leads to a delay in measurement and a slow response in the detection process; in terms of material selection, the casing material must meet certain conditions such as hardness, sealing, and corrosion resistance. Due to the characteristics of the material itself, it is not easy to connect the protective casing and the temperature sensor , the material connecting the probe and the bushing is more critical, it needs to have a small thermal conductivity, and the adhesion must meet the process requirements such as fracture prevention

[0004] In many engineering fields, there are high requirements for temperature measurement. For example, in the ground source heat pump soil thermal response test, the temperature difference between the inlet and outlet of the underground buried pipe may be lower than 2K. At this time, the traditional temperature measuring probe is used, and the accuracy is generally in ±1K or so, in many cases, this kind of temperature probe can not accurately measure the temperature difference between the inlet and outlet water, so this kind of temperature measuring probe can not meet the measurement requirements

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