Freezers are also called freezers, which are equipment that preserves food and other items at low temperatures. There are two distinctions between home and commercial use. Most commercial freezers are Top Open Door Freezer, which is used in restaurants, water bars, food processing, and supermarkets. In terms of structure, the freezer generally includes a box, a refrigeration system, and an electrical system.
The basic function of the freezer is to refrigerate and keep the inside of the box at an appropriate low temperature. The refrigeration system is generally composed of four basic components: a compressor, a condenser, a capillary tube or a thermal expansion valve, and an evaporator. Refrigerant is a liquid that can boil at low temperature at low pressure. It absorbs heat when it boils. The refrigerant circulates continuously in the refrigeration system. The compressor increases the gas pressure of the refrigerant, causing liquefaction conditions. When passing through the condenser, it condenses and liquefies to release heat. , And then reduce the pressure and temperature when passing through the capillary tube, and then boil and vaporize to absorb heat when passing through the evaporator. Nowadays, refrigeration diodes are developed and used without complicated mechanical devices, but the efficiency is poor, so they are used in small refrigerators. In addition, because some moisture and impurities are unavoidable in the system, a filter drier is generally installed at the inlet end of the capillary tube.
Refrigerators use electricity as the main energy source, rely on electric motors to drive compressors or refrigeration diodes, and are generally equipped with relay protectors and thermostats. Refrigerator motors using compressors can be divided into resistance split-phase starting type, capacitor starting type, and capacitor starting capacitor operation type according to different starting methods. The motor of the hermetic compressor is installed inside the refrigeration system. It is in contact with refrigerant and refrigerating oil for a long time, and bears pressure and high temperature. Therefore, it must be resistant to refrigerant and refrigerating oil, stable electrical performance, high-temperature resistance, vibration, and shock resistance, There are requirements for greater starting torque and keeping clean and moisture-free.