A high-precision high and low temperature constant temperature test device

Abstract

The invention discloses a high-precision high-low-temperature constant-temperature testing device which comprises a bedplate (1). The bedplate (1) is provided with a ventilating pipe (2), the upper portion of the ventilating pipe (2) is provided with a seal cover (3), the bedplate (1) is provided with ventilating holes (4) which are formed by surrounding the ventilating pipe (2), the bottom of the bedplate (1) is provided with an air outlet box (5) communicated with the ventilating holes (4), the air outlet box (5) is connected with a temperature control cavity (7) through an air outlet pipe (6), the temperature control cavity (7) is communicated with the lower portion of the ventilating pipe (2), and a condenser pipe (8) and a heating pipe (9) are arranged in the temperature control cavity (7) and connected with a temperature sensor (10) arranged in the seal cover (3) through a control unit; the side of the temperature control cavity (7) is provided with a side fan (11), and the lower end of the ventilating pipe (2) is provided with a bottom fan (12). The high-precision high-low-temperature constant-temperature testing device has the advantages of being small in temperature control fluctuation and good in temperature uniformizing effect.

Description

technical field [0001] The invention relates to a high-low temperature constant temperature test device, in particular to a high-precision high-low temperature constant temperature test device with stable temperature control. Background technique [0002] There are many working principles of traditional high and low temperature incubators. At present, the most used one is the built-in gas circulation system in the incubator. The temperature is refrigerated by the compressor and heated by the heating wire to make the gas in the box cool or warm up. The controller can adjust the circulating air volume and direction to make the temperature in the box evenly balanced. The high and low temperature box adopting this principle has a simple structure, but due to the difference in the way of circulation and convection, the control results are not accurate, and the technical requirements of a high-precision constant temperature box cannot be realized. [0003] Other principles includ...

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Problems solved by technology

[0004] At present, the high and low temperature thermostats usually adopt the above principle, and the technical indicators can only meet the following requirements: temperature range: 0°C ~ 100°C, temperature deviation ± 1.0°C, temperature uniformity 1.0°C, temperature fluctuation ± 0.5°C; temperature range: -60℃~0℃ or 100℃~200℃, temperature deviation ±2.0℃, temperature uniformity 3.0℃, temperature fluctuation ±0.5℃; temperature range: 200℃~300℃, temperature deviation ±3.0℃, temperature uniformity 3.0°C, temperature fluctuation ±2°C

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