The high and low temperature impact test chamber is the most common temperature test equipment in the environmental test equipment. The related products are high and low temperature alternating test chamber, constant temperature and humidity test chamber, high and low temperature wet heat alternating test chamber and so on. The above several test equipments are nothing more than temperature control, and the control methods are similar. We will refer to the high and low temperature impact test chamber to learn more about the temperature control of the high and low temperature impact test chamber series.
First of all, how do high and low temperature impact test chambers achieve high and low temperatures?
When it comes to temperature, there are high and low temperatures. High temperature control is a heating process and control is relatively simple. The heating of high and low temperature impact test chamber adopts independent heating mode, far infrared nickel-chromium alloy high-speed heating electric heating wire, temperature control adopts system co-channel coordinated control, and output power is calculated by microcomputer to achieve high precision and high efficiency electricity. benefit. In order to achieve rapid heating rate and high temperature, it is generally achieved by increasing the number of heating wires and improving the temperature control software control performance.
The refrigeration system of the high and low temperature impact test chamber uses a unit freon refrigeration system consisting of a Taikang totally enclosed compressor made in France. The working principle of refrigeration is to use an inverse card cycle, which consists of two isothermal processes and two adiabatic processes. The refrigerant is adiabatically compressed to a higher pressure by the compressor, and the consumed work increases the temperature of the exhaust gas. The refrigerant is heat-exchanged with the surrounding medium through the condenser to transfer heat to the surrounding medium. This cycle is repeated to achieve the purpose of cooling. The high and low temperature impact test chamber adopts balanced temperature regulation. When the refrigeration system is in continuous operation, the control system controls the output of the heater according to the result of the automatic calculation output according to the set temperature point, and finally achieves a dynamic balance.
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