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Analysis supermarket refrigerated showcase vacuum freeze drying equipment system composition
supermarket refrigerated showcase food vacuum freeze drying equipment is a device that integrates vacuum, refrigeration, heating and drying, cleaning and disinfection and other functions.
food vacuum freeze dryer is mainly composed of heating and drying system, vacuum system, refrigeration system and so on.
1, heating and drying system. The heating system provides heat for drying and accelerates the drying speed. There are two heating methods, direct heating and indirect heating. Direct heating generally uses electric heating wires wrapped with insulating mineral materials and metal protective sleeves: indirect heating uses various heat sources to first heat the heat carrier medium outside the drying box, and then use a pump to transport it to the shelf in the drying box. The heating source can be electricity, gas, coal, etc., and the heating medium includes water, mineral oil, water vapor, and glycol aqueous solution. In addition to the above two heating methods, there are also methods of heating by infrared radiation using radiant heating plates, and heating plates using high frequency microwave heating
2, vacuum system. During the freeze-drying process of the supermarket refrigerated showcase, when the vacuum system is working, cryopumps are mainly used to absorb gas molecules on the low-temperature surface, so as to achieve the purpose of pumping, and the gas is not discharged to the outside world. At present, closed-circuit nitrogen compressor vacuum pumps are commonly used in the vacuum field, and GTM and SALVY cryogenic pumps are commonly used. The freeze-drying vacuum system is different from the ordinary vacuum system. The freeze-drying vacuum system not only removes air, but also continuously removes the sublimated water vapor, and has a certain extraction speed requirement. There are two types of vacuum systems in food vacuum freezing and drying equipment, one is a steam jet vacuum system without cold trap, and the other is an oil-sealed mechanical vacuum pump system with cold trap. In order to avoid the situation that the pump is easy to generate heat and a large amount of gas is saturated after being absorbed by the gas load and cannot work, it is generally equipped with a backing pump to pump out a large amount of gas. The pre-freezing of food can be done outside the drying box or inside the drying box. For vacuum refrigeration equipment that completes pre-freezing in the dry box, the refrigeration system must bear the cooling load of food pre-freezing and the load of the cold trap that captures water vapor. The cold trap is the evaporator in the refrigeration system. In vacuum freeze-drying, the temperature of the cold trap should be kept low enough to ensure that the sublimated water vapor has sufficient diffusion power, while preventing water vapor from entering the vacuum pump. The surface of the cold trap should have an appropriate temperature (generally -40 to -50°C) and sufficient water trapping area.
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