Short thermocouple calibration system

Abstract

The invention relates to a short thermocouple calibration system. A heat-conducting medium in a temperature-constant field subsystem is made of a pure copper material, pure copper is wrapped in a high-temperature-resistant alloy material, the internal of calibration holes and the internal of a temperature control sensor hole include high temperature alloy material inlaid layers, a protecting tubeof a ceramic material is arranged in the upper portion, a temperature-constant block sealing plate is arranged in the top of a furnace opening, a high-temperature sealant is arranged among a temperature-constant block, an oxidation-preventive cylinder, a temperature-constant block pillar, the protecting tube and the temperature-constant block sealing plate for sealing, a heat insulation layer is arranged in the upper of the temperature-constant block sealing plate, a heating wire is wound around the oxidation-preventive cylinder, and a heat insulation layer wraps the heating wire. The pure copper serves as the heat conducting medium, the calibration holes and the temperature control sensor hole are provided with the sealing inlaid layers of high-temperature alloy materials, a bottom touchtemperature measurement manner is used, the uniformity of the axial temperature field close to the furnace opening is reduced greatly, and the problem that only thermocouples in length of 35mm can becalibrated at present and the short thermocouple is hard to calibrate is solved.

Description

technical field [0001] The invention belongs to the field of thermocouple calibration, and in particular relates to a short thermocouple calibration system. Background technique [0002] At present, thermocouple calibration devices at home and abroad can only calibrate thermocouples with a long length. Generally, the length of thermocouples is required to be at least 150 mm, because shallow calibration holes cannot provide temperature field uniformity that meets technical requirements. It has seriously affected the development of short thermocouples. For example, the dry body furnace of FLUKE company has a deep calibration hole, generally 160 to 203mm, and its uniform temperature field can only be used in the range of 60mm from the bottom up, that is to say, its insertion depth must be above 100mm, but the short thermoelectric The couple length is sometimes only about 35mm, so short thermocouple calibration cannot be achieved. Contents of the invention [0003] In order ...

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Problems solved by technology

[0002] At present, thermocouple calibration devices at home and abroad can only calibrate thermocouples with a long length. Generally, the length of thermocouples is required to be at least 150 mm, because shallow calibration holes cannot provide temperature field uniformity that meets technical requirements. Seriously affected the development of short thermocouples

For example, the dry body furnace of FLUKE company has a deep calibration hole, generally 160 to 203mm, and its uniform temperature field can only be used in the range of 60mm from the bottom up, that is to say, its insertion depth must be above 100mm, but the short thermoelectric The couple length is sometimes only about 35mm, so short thermocouple calibration cannot be achieved

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