Vacuum vitrescence drying machine

Abstract

The invention belongs to the field of drying equipment and in particular relates to a vacuum vitrescence drying machine which comprises a material tank, a heating unit, a vacuum unit and a condensation unit, wherein the heating unit comprises a heating plate and a heater, the heating plate is arranged in the material tank and used for accommodating materials, and the heater is arranged outside the material tank and used for providing heat for the heating plate; the vacuum unit comprises a roots pump and a rotary vane pump; the condensation unit comprises a primary cold trap, an auxiliary cold trap and a refrigeration unit which is used for refrigerating the primary cold trap and the auxiliary cold trap; the primary cold trap is arranged between the roots pump and the material tank, and the auxiliary cold trap is arranged between the rotary vane pump and the roots pump; the refrigeration unit comprises refrigeration coils and a refrigeration machine, the refrigeration coils are arranged in the primary cold trap and the auxiliary cold trap, and the refrigeration machine is used for refrigerating the refrigeration coils. The primary cold trap and the auxiliary cold trap can fully response wave crest impact, moisture can be fully gathered, the moisture is prevented from infiltering into a vacuum pump system due to not being gathered, the vacuum maintenance of a whole system is prevented from being affected, and the drying efficiency is prevented from descending.

Description

technical field [0001] The invention belongs to the field of drying equipment, in particular to a vacuum glass dryer. Background technique [0002] Dry preservation is one of the most important preservation methods for food. Drying is to remove part of the water in the food by various means and reduce its water activity, so as to effectively inhibit the growth and reproduction of microorganisms and achieve the purpose of long-term food preservation. Moreover, after the food is dried, the quality is reduced and the volume is reduced, which can save packaging, storage and transportation costs, and bring convenience. [0003] At present, the drying methods used in industrial applications mainly include hot air drying, medium and short-wave infrared drying, microwave drying, variable temperature and pressure difference puffing drying, vacuum drying and vacuum freeze drying. However, these single drying methods have their own advantages, disadvantages and limitations: hot air d...

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Problems solved by technology

However, these single drying methods have their own advantages, disadvantages and limitations: hot air drying equipment requires simple, uniform drying of materials but a relatively long production cycle; medium and short-wave infrared drying is faster than hot air drying, but its penetrating ability is not strong. The heating speed is slow, and the surface of the material is easy to burn in the later stage of drying; the heating of the microwave drying material is uneven, and the product is easy to crack; the production cycle of variable temperature and pressure difference puffing drying is short, and the product is good, but there are certain requirements for the moisture content of the material Generally, it needs to be pre-dried to remove a certain amount of water; vacuum drying equipment is expensive and dry slowly; vacuum freeze-dried products have the best quality, but the energy consumption is huge and the drying time is long

However, there is no equipment with simple structure and continuous production for realizing glassy drying technology.

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