The refrigerator is generally called a "commercial refrigerator", which is a refrigerating and freezing device with a small refrigeration device. It is widely used in food stores, restaurants, kitchens and hotels to store food such as meat, poultry, eggs, fish, shrimp, vegetables and fruits. Most commercial refrigerators (cabinet) use open-type compressors. The volume of the refrigerator is much larger than that of the household refrigerator. The volume of the refrigerator is generally 0.2 to 3, and the largest assembled refrigerator has a volume of 10 cubic meters. Refrigerator refrigeration system working characteristics The working principle of the refrigeration system of the refrigerator is basically the same as that of the household refrigerator, which also includes the four processes of compression, condensation, throttling and evaporation. Taking the air-cooled unit as an example, when the refrigerator is working, the low-temperature and low-pressure refrigerant vapor in the evaporator is sucked into the compressor, compressed into high-temperature and high-pressure refrigerant vapor, and is cooled in an air-cooled condenser. The air is quickly blown toward the surface of the condenser through the axial fan facing the condenser, exchanges heat with the refrigerant in the system, and the refrigerant is condensed into a high pressure and supercooled liquid. The refrigerant liquid coming out of the condenser is filtered and dried by the drying filter, and then throttled and depressurized by the thermal expansion valve, and the refrigerant becomes wet steam. Finally, the refrigerant in the evaporator absorbs the heat of the food in the tank, the refrigerant becomes a low-temperature and low-pressure vapor, and is sucked by the compressor to start the next refrigeration cycle. The capillary is replaced by a thermal expansion valve in the refrigeration system of the refrigerator in order to regulate the flow of refrigerant into the evaporator to accommodate changes in refrigeration load. Viruses and bacteria are everywhere. Preventing them in advance is the best way to reduce the risk of infection. Wearing a mask and washing hands frequently are crucial. The new type of coronavirus has the characteristics of contact transmission, and the fact that the virus exists on the doorknob of patients with pneumonia has also shown the necessity of paying attention to hand hygiene and wearing disposable protective gloves.
Whether it is going out to purchase daily necessities or buying through online platforms, it is inevitable to come into contact with "foreign" items, such as supermarket shopping carts, packaging bags, express packaging boxes, etc., and more things need to be touched after resuming work, such as It is inevitable to take public transportation, elevators, etc., these places may have been touched by patients or suspected patients. Wearing disposable protective gloves is an effective means to reduce the risk of infection when there is no condition to wash your hands at any time.
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