Freezing and drying integrated vacuum freezing and drying machine

Abstract

The invention relates to a drying device, in particular to a freezing and drying integrated vacuum freezing and drying machine. The machine comprises a freezing and drying evaporation bin, a freezing evaporation plate arranged in the freezing and drying evaporation bin, a water catching bin, a refrigeration compressor unit, a vacuum pump and an electrical control cabinet, wherein the refrigeration compressor unit is composed of a refrigeration compressor, an oil separator, a condenser and a liquid storage device. The freezing and drying integrated vacuum freezing and drying machine is characterized in that the part between the closed freezing and drying evaporation bin and the closed water catching bin is partitioned through two parallel partition plates, a closed cavity is formed between the two parallel partition plates, a ventilation hole is formed in the lower end of the partition plate on one side of the freezing and drying evaporation bin, and a ventilation hole is formed in the upper end of the water catching bin partition plate on one side of the water catching bin. The refrigeration compressor is connected with the freezing and drying evaporation bin and the water catching bin through a pipeline, and the vacuum pump is connected with the bottom of the water catching bin. The technical scheme has the beneficial effects that the equipment configuration and structure are more reasonable, the equipment running efficiency is high, and the service life is long. The production cost and the using cost of the equipment can be reduced by about 10%-20% compared with current vacuum freezing and drying equipment.

Description

technical field [0001] The invention relates to a drying device, in particular to a freeze-drying combined vacuum freeze-drying machine. Background technique [0002] The vacuum freeze-drying process is carried out in a low-temperature and low-oxygen environment. The material sublimates and escapes water vapor in the ice state and vacuum environment to remove moisture from the material. The moisture content of the freeze-dried material is generally about 3-5%. This process can retain the original color, aroma, taste and nutritional components of the freeze-dried material to the greatest extent, and has the characteristics of appearance, shape and good rehydration, and can restore the fresh state of the material within seconds to minutes. Freeze-dried products do not contain any additives and preservatives, and can be stored at room temperature for 3 to 5 years. Freeze-dried products are light in weight and easy to transport. Aerospace food is all freeze-dried products. [0...

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Problems solved by technology

[0003] The patent named "Vacuum Freeze Dryer" authorized by the China Intellectual Property Office on March 24, 2010, the authorized announcement number: CN100595505C is an invention patent. This machine combines freeze-drying, vacuum heating and drying together, and has a structure Compact, low energy consumption, etc., but there are the following problems in the process of use: 1. When vacuuming, heating and sublimation drying, the sublimated water vapor in the freeze-drying chamber directly enters the bottom of the water-catching chamber from the bottom, and the cold air sinks due to the rising of the hot air Due to the physical characteristics of the water trap, the rising velocity of the water vapor flowing through the trap is relatively fast, which shortens the frosting time of the trap, lowers the water trapping efficiency, prolongs the freeze-drying time, and increases power consumption; 2. Due to the casing type The heat transfer effect of the refrigerant liquid return heater is low, and the cooling of the circulating cooling water cannot meet the water temperature requirements of the condenser, resulting in an increase in the operating load of the refrigeration compressor unit. If the heat exchange area of ​​the refrigerant return liquid heater is increased, it will be greatly Increase equipment production cost and volume and other issues

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