A low-temperature thermocouple calibration device in the temperature range of 77-90k

A calibration device, thermocouple technology, applied in the direction of measuring devices, thermometers, measuring heat, etc., can solve the problems of repeatedly destroying the vacuum state, rearrangement, complicated operation, and non-reuse, so as to make up for the shortage of calibration technology and ensure cold storage. The effect of large quantity supply and calibration capability

CN109238514BInactive Publication Date: 2019-07-09ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-07-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a low-temperature thermocouple calibration device for a 77-90K temperature area. The calibration device comprises a vacuum pump, a liquid nitrogen tank, a tapered container, acalibration platform, a heat sink, a constant-temperature block, a thermocouple to be calibrated, a standard thermometer, a vacuum tank, a vacuum pump and a data collection instrument. By use of the method, a stable temperature point between 77 and 90K can be conveniently obtained, and in addition, a plurality of thermocouple thermometers can be simultaneously calibrated. The set of device has theadvantages of being convenient in operation, high in accuracy, high in a calibration amount and the like.
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Description

technical field

[0001] The invention relates to the technical field of low-temperature refrigeration engineering, in particular to a calibration device for a low-temperature thermocouple thermometer in a temperature range of 77-90K. Background technique

[0002] In low-temperature cavitation and liquid flooding experiments, the temperature range of the experimental section is between 77 and 90K, the frequency of temperature changes is very fast, and more temperature measuring points need to be arranged. Therefore, low-temperature thermocouples are widely used in the temperature measurement of the experimental section of low-temperature cavitation and liquid flooding experiments due to their excellent dynamic response characteristics and low cost.

[0003] The traditional low-temperature thermocouple calibration method uses the boiling point of liquid nitrogen under standard atmospheric pressure, the temperature point of ice-water mixture, and the boiling water point as three...

Examples

Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention will be further described, and the low-temperature thermocouple thermometer calibrated in the liquid nitrogen flooding experiment is taken as a specific embodiment.

[0031] like Figure 1~4 As shown, the thermocouple calibration device of this embodiment includes: a vacuum pump 1, a first valve 2, a second valve 6, a top cover 5, a liquid injection port 4, an air outlet 7, a freezing point tank 8, a data acquisition instrument 9, Thermocouple to be calibrated 3, standard thermometer 10, constant temperature block 11, calibration platform 12, heat sink 13, vacuum chamber 14, liquid nitrogen tank 15, conical container 16, connecting rod 17, heat absorbing rod 18, limit piece 19, Thermocouple socket 20 and controllable heating wire 21.

[0032] like figure 1As shown, the thermocouple calibration device of this embodiment is divided into three chambers from outside to inside, which are vacuum chamber 1...