Internal heating type roller vacuum drying machine

Abstract

The invention discloses an internal heating type roller vacuum drying machine which comprises a drum drying bin, a gear ring, an elbow device, a discharging device, a bracket, a heating tank, a driving device, a vacuum unit, an air guide pipe, a heat insulation layer, a riding wheel and a hopper. The drum drying bin comprises a drum, a spiral blade, heating pipes and a fixing strip. Each heating pipe comprises a metal pipe, a heat conduction working medium and a heating device; and the lower ends of the heating pipes are fixed on a drum body in the drum. Heat energy carried by the medium in the heating tank carries out heat conduction heating on materials through the drum body in the drum of the drum drying bin and the heating pipes on the drum body, and the heat conduction heat exchange area of a heater with the heating strip is 8-35 times larger than that of a heating plate; and the vacuum unit exhausts air in the drum drying bin and moisture generated when materials are dried. Whenone heating pipe is damaged and generates leakage, the use of the whole drum drying bin is not influenced, the material drying efficiency is improved, the material drying effect is optimized, and environment-friendly drying, energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention relates to a drum vacuum dryer, in particular to an internal heating drum vacuum dryer. Background technique [0002] Nowadays, in the processing and production fields of grain, food, chemical industry, medicine, agricultural and sideline products, pasture, etc., it is necessary to heat and dry the materials under vacuum conditions; the drum drying chambers of the drum vacuum dryers on the market are mostly heat-conducting in a row-pipe type. Heat dissipation and interlayer heating are used for heat exchange and heat dissipation, but their radiators are large in size, small in heat dissipation area, and low in efficiency of heat energy use. Wet materials often form agglomerates under vacuum, which causes uneven drying of wet materials and affects the drying quality of materials. The heating tube of the drum drying chamber has a high failure rate during use and is not easy to maintain. When a heating pipe in the drying chamber is damaged...

AI Technical Summary

Problems solved by technology

The heat conduction area of ​​the lower end of the heating pipe is limited, and the metal plate surface of the pipe head with a small heat exchange area only inputs a small amount of heat. The heat conduction working medium has a limited heating area, which affects the heat conduction of heat energy to the heat conduction working medium in the inner cavity of the tube. Heating, resulting in insufficient total heat energy of the heat-conducting working medium, resulting in the heating tube not being able to output a large amount of heat energy, and the materials in the drum drying chamber cannot get enough heat energy, which affects the drying speed of the drum vacuum dryer.

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