1. Air cooling method of high and low temperature impact test box: multi-stage diaphragm air heat exchanger. Second, the air circulation device: high and low temperature impact test box built-in air-conditioning room, circulating air duct and long-axis centrifugal fan, use efficient refrigerator and energy adjustment system, through efficient fan to effectively exchange to achieve the purpose of temperature change . By improving the air flow, the air flow rate and the heat exchange capacity with the heater and the air cooler are improved, thereby greatly improving the temperature uniformity of the high and low temperature impact test chamber. 3. Refrigeration system and compressor: In order to ensure the cooling rate and minimum temperature requirements of the test chamber, the high and low temperature impact test chamber produced by Lin Bin is used in this test chamber using a set of imported German Copeland semi-hermetic compressor binary cascade Type water cooling refrigeration system. It consists of a high-temperature refrigeration cycle and a low-temperature refrigeration cycle. The connecting container is an evaporative condenser. The evaporative condenser is also used for energy transfer. It transfers the heat energy in the working room through the two-stage refrigeration system to achieve the purpose of temperature rise. The design of refrigeration system uses energy regulation technology, an effective processing method can not only ensure the normal operation of the refrigeration unit but also effectively adjust the energy consumption and cooling capacity of the refrigeration system, so that the operating cost of the refrigeration system And the failure rate dropped to a more economical state. 4. Refrigerant: adopt DUPONT R502 (high temperature cycle), R23 (low temperature cycle); Fifth, some other auxiliary parts of the refrigeration system: expansion valve (US SPORLAN), solenoid valve (Italy CASTEL); filter (US SPORLAN); pressure controller (British and American RANCO), oil separator (European and American ALCO) and other refrigeration accessories Imported parts are used. Sixth, the working principle of high and low temperature impact test box refrigeration: the high and low refrigeration cycles are all reverse Karo cycles, which are composed of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed by the compressor to a higher pressure, which consumes work to increase the temperature of the exhaust gas, and then the refrigerant exchanges heat isothermally with the surrounding medium through the condenser, and transfers the heat to the surrounding medium. After the refrigerant adiabatically expands to work through the valve, the refrigerant temperature decreases. Finally, the refrigerant absorbs heat isothermally from the object with a higher temperature through the evaporator, thereby lowering the temperature of the object to be cooled. This cycle is repeated to achieve the purpose of high and low temperature impact test.
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Overview of refrigeration equipment for high and low temperature impact test chamber