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display cases Start-up of cascade refrigerators and expansion vessel
author: supermarket refrigerated showcase category: walk-in display coolers Views: 566Time: 2016-08-22
display cases Start-up of cascade refrigerators and expansion vessel
display cases Cascade refrigerators must first start the high-temperature stage, when the intermediate temperature is reduced enough to ensure the condensation of the low-temperature stage The low temperature level can be started only when the pressure does not exceed 1.57MPa. If the expansion vessel is connected to the exhaust pipe and a pressure control valve is installed on the connecting pipe, the high and low temperature parts can be started at the same time. Because once the exhaust pressure of the low temperature part rises to the limit value, the pressure control valve will automatically open, so that the exhaust pipeline is connected to the expansion vessel and the pressure is reduced. This starting method is often used by small cascade refrigeration units.
display cases The low-temperature part of the cascade refrigerator is equipped with an expansion vessel. It is a unique device in the low-temperature system, and its function is to prevent excessive pressure rise in the system. Because when the cascade refrigerator stops running, the temperature in the system will gradually rise to ambient temperature, and the low-temperature refrigerant will all vaporize into superheated vapor (because the critical temperature of low-temperature refrigerant is generally low), in order to prevent low temperature The pressure in the system is excessively increased. In large-scale installations, the low-temperature refrigerant is usually kept in a low-temperature state (regularly operate the high-temperature part) or the low-temperature refrigerant is pumped out, liquefied, and put into a high-pressure steel cylinder. For low-temperature cascade refrigeration devices for small and medium-sized tests, the expansion volume is set in the low-temperature system so that most of the vaporized low-temperature refrigerant vapor enters the expansion and expansion vessel after shutdown, so that the pressure of the entire system is maintained at an allowable level Within work pressure. The pressure maintained in the system after the expansion stop is generally 0.98~1.47MPa.
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