Vacuum drying apparatus

Abstract

The invention is about a kind of Minton dryer, composing of case vacuum pump and heating groupware. The heating groupware composes of hot plate set in the case and heater offering heat energy to the hot plate out of the case; the vacuum is made up of Roots pump and rotary vane pump, concatenating refrigerating catcher between the Roots pump and rotary vane pump. The refrigerating catcher, expansion valve and heat exchanger build up refrigeration circular system. The invention can recover organic solvent, benefit lowering production costs and environmental protection, reduce pressure quickly, keep vacuum effectiveness good, dries quickly under the low temperature and consume less energy.

Description

technical field [0001] The invention relates to a vacuum drying device. Background technique [0002] Vacuum drying has a series of advantages such as low drying temperature and relative lack of oxygen in the drying room, which can avoid fat oxidation and pigment browning. It is suitable for drying heat-sensitive materials. In addition, the equipment cost and drying cost are relatively low, so vacuum drying is in Food, pharmaceutical, chemical and other industries have a wide range of applications. [0003] The traditional vacuum drying device has a vacuum component, a heating component and a box. The vacuum component has a vacuum pump. The heating component has a plurality of hollow heating tubes arranged in the box. The heating tube is generally heated by steam, and the heat transfer of the material mainly depends on heat conduction. . The material is placed in a metal plate and placed on the heating tube. The heat reaches the inside of the material through heat conducti...

AI Technical Summary

Problems solved by technology

However, the gas extracted by the traditional vacuum drying device is directly discharged into the atmosphere. If the material contains organic solvents, the organic solvents cannot be recovered, which is not conducive to reducing production costs and environmental protection.

The vacuum drying device uses a water ring vacuum pump to reduce the pressure. Due to the influence of the saturated vapor pressure of water, the boiling point of water in the drying box is usually greater than 50°C. Most conventional vacuum drying ovens have a faster drying temperature than 80°C. The drying speed is slow when drying at 50°C~80°C, and it is difficult to dry when the drying temperature is less than 50°C, and the traditional vacuum drying equipment has a small vacuum pumping capacity, slow pressure reduction speed, and high energy consumption

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