Fruits and vegetables are a kind of plants or fungi that can be cooked and cooked into food. Fruits and vegetables are one of the essential foods in people's daily diet. Fruits and vegetables provide nutrients such as vitamins and minerals essential to the human body. According to the statistics of FAO in 1990, 90% of the essential VC and 60% of VA come from fruits and vegetables. In addition, there are many kinds of phytochemicals in fruits and vegetables, which are recognized as effective ingredients for health. At present, nutrients in fruits and vegetables can effectively prevent various substances of chronic and degenerative diseases, and are being discovered by people.

With the use of fruits and vegetables more and more extensive, in order to ensure the freshness of fruits and vegetables, freeze-drying is often used to preserve fruits and vegetables; freeze-drying is commonly referred to as lyophilization, which is to freeze and freeze the fruits and vegetables containing a large amount of water to form a solid, and then under vacuum conditions. The water is directly sublimated from the solid state into a gaseous state, which is separated from the fruits and vegetables. Under such production conditions, fruits and vegetables that are easily oxidized, volatile, and heat-sensitive can be preserved, and the harmful effects of bacteria and enzymes can be inhibited, and the biological, chemical structure and activity of fruits and vegetables can be well ensured. Therefore, the color, fragrance, taste shape and nutrients of freeze-dried fruits and vegetables can be kept the same as fresh products, and the rehydration is simple and fast, and can be basically restored into fresh products. The water content of freeze-dried fruits and vegetables is below 3%. Conducive to the long-term preservation of fruits and vegetables.
    However, the existing lyophilizer usually separates the two processes of pre-cooling and drying, and is separately completed by two independent devices, so that the lyophilizer has a large volume, a complicated structure, frequent operations, and large energy consumption.
Utility model content
   In view of the above deficiencies in the prior art, the object of the present invention is to provide a fruit and vegetable lyophilizer which is small in size and simple in operation, and capable of unifying two processes of pre-cooling and drying-large Food freeze dryer can be used for deep processing of meat, vegetables, fruits, aquatic products, soy milk, beverages, soups, health products and other foods.

Freeze-dried foods meet the requirements of natural, nutritious and convenient. The food freeze dryer is based on the accumulated experience in the fields of heat collection, vacuum, refrigeration, pressure vessel manufacturing and automatic control technology, and has been developed by digesting and absorbing the advanced technology of similar equipment in the world. It uses built-in alternately working water vapor traps, full-liquid circulating cooling systems, heating and water vapor capture systems designed for accelerated sublimation theory, and advanced technologies such as vacuum steam melting.