Liquid nitrogen refrigeration micro-wave heating vacuum drier

Abstract

The invention relates to the technical field of vacuum freeze drying, and provides a liquid nitrogen refrigeration micro-wave heating vacuum drier, which includes a refrigeration drying part connected with a water circulation vacuum pump and a liquid nitrogen refrigeration system, as well as a PLC main-control system connected with the water circulation vacuum pump, the liquid nitrogen refrigeration system and the refrigeration drying part, wherein the refrigeration drying part includes a sealed freeze-dry box; a rotating main shaft is vertically arranged in the freeze-dry box; the rotating main shaft is connected with a plurality layers of freeze-dry pallets from the top down; a micro-wave heating system is arranged above each layer of freeze-dry pallet; and the micro-wave heating system include microwave generators. The liquid nitrogen refrigeration micro-wave heating vacuum drier provided by the invention adopts the liquid nitrogen refrigeration manner and the microwave rotary heating manner, effectively enlarges the refrigeration temperature reach of the freeze-dry box, improves the freeze-dry efficiency, and reduces the freeze-dry time and energy consumption; besides, the water circulation vacuum pump adopted by the liquid nitrogen refrigeration micro-wave heating vacuum drier requires no water catching system, and effectively controls the degree of vacuum of the freeze-dry box, thereby avoiding the problems such as high energy consumption caused by the adoption of the water catching system.

Description

Technical field: [0001] The invention relates to the technical field of vacuum freeze drying, in particular to a liquid nitrogen freeze microwave heating vacuum dryer. Background technique: [0002] Vacuum freeze-drying technology uses the principle of sublimation to dry substances and is widely used in the field of food and drug processing. This is because vacuum freeze-drying can prevent the physical, chemical and biological denaturation of dry substances to the greatest extent. Therefore, the development prospects of vacuum freeze-drying machines increasingly favored by people. The vacuum freeze dryer includes eight systems, namely refrigeration, circulation, vacuum, electrical, hydraulic, pneumatic, water ring, SIP / CIP. [0003] At present, the traditional freeze dryers used are mainly compressor refrigeration systems. For example, a vacuum freeze dryer disclosed in Patent No. 200610008269.X is a vacuum freeze dryer using compressor refrigeration. Although this vacuum...

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Problems solved by technology

Although this vacuum freeze dryer can be used in the field of food and drug production, due to the use of electric heating, compressor refrigeration, and freon as a refrigerant, this vacuum freeze dryer has many problems in freezing, such as a small temperature range and low heat transfer efficiency. High, high operating costs, high probability of failure, high equipment maintenance costs, etc.

[0004] The patent number is 201020223133.2. The published invention patent proposes the use of liquid nitrogen freezing as the refrigeration system of the vacuum freeze dryer, which can effectively improve the temperature control range and heat transfer efficiency, but the design concept of this liquid nitrogen freeze vacuum drying is still Based on the traditional vacuum freeze dryer model, only the refrigeration system of the freeze dryer is changed, and the electric heating system is still used, and the vacuum system combined with the vacuum pump and the Roots pump, etc.

This has led to problems with the liquid nitrogen freeze vacuum dryer, such as high operating costs, slow and uneven heating of the product, etc.

[0005] In addition, microwave freeze-drying technology has been reported. This technology is a combination of microwave drying and vacuum freezing.

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