Air temperature testing box

Abstract

The invention provides an air temperature testing box. The air temperature testing box is characterized by comprising a control system, a box body, and a heater, a refrigerating device, a medium circulation device and an air circulation device which are arranged in an inner cavity of the box body, wherein the medium circulation device is connected with the heater and the refrigerating device respectively; the medium circulation device comprises a sealed circulation tank, a circulation pump and a heat exchanger, which are connected in sequence to form a closed loop; the sealed circulation tankis connected with the refrigerating device; the heater is arranged in the sealed circulation tank and is used for directly heating a medium; the air circulation device comprises a variable frequency draught fan and an air channel plate; the box body is provided with a working region, a working region door, an equipment region and an equipment region door; the heat exchanger, the variable frequencydraught fan and the air channel plate are arranged in the working region. According to the air temperature testing box provided by the invention, a temperature index is higher, the temperature risingspeed is rapid and the working efficiency is high; calibration requirements of various high-precision environment temperature monitoring instruments can be met.

Description

technical field [0001] The invention relates to the technical field of environmental test devices, in particular to an air temperature test chamber. Background technique [0002] The temperature test chamber is mainly suitable for the inspection and calibration of various performance indicators of various electronic components such as electronic devices, electronic instruments and meters, and high-precision temperature detection instruments in high and low temperature environments. For example, with the development of sensor technology and the improvement of production technology, high-precision thermometers using NTC and semiconductor sensors continue to develop, and the measurement accuracy can even reach MPE±0.1°C. Its calibration method is usually compared with a standard platinum resistance thermometer in a liquid constant temperature bath or an air test chamber. Among them, although the accuracy of the liquid constant temperature bath can meet the calibration needs of...

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Problems solved by technology

Among them, although the accuracy of the liquid constant temperature bath can meet the calibration needs of environmental temperature monitoring instruments, many integrated digital temperature sensors cannot be placed in the constant temperature bath, but it is only suitable for devices where the sensor and the measuring instrument can be separated, and is limited by the constant temperature. The temperature chamber size and temperature range of the tank, the calibration efficiency is low, and the constant temperature bath cannot effectively reflect the change of air temperature

[0003] Compared with the liquid constant tank, the air temperature calibration test box allows the calibration and inspection of the integrated ambient temperature detection equipment, but due to the poor thermal conductivity of the air, the mechanical structure of the box, processing technology, heat preservation treatment, medium circulation mode, Due to the air circulation in the box, the accuracy of the temperature sensor, and the automatic temperature control, the temperature fluctuation and uniformity of the existing large-scale air temperature test chambers cannot achieve high accuracy. The temperature field fluctuation can only reach ±0.2°C / 30min, the temperature uniformity is 0.3°C, and the measurement expansion uncertainty of the device exceeds 0.2°C (k=2), which cannot meet the calibration and inspection requirements of high-precision environmental monitoring instruments or electronic components

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