Improved vacuum rake type dryer

Abstract

The invention provides an improved vacuum harrow dryer with energy conservation, high efficiency, short heating time, high production efficiency and stable product quality. The vacuum harrow dryer comprises a casing body, harrow teeth and a transmission device, the harrow teeth are fixed on a stirring shaft, the stirring shaft is penetrated in the casing body, the stirring shaft is connected with the transmission device, the casing body is provided with a jacket, and the jacket is provided with a steam inlet and a steam outlet. The vacuum harrow dryer is characterized in that the stirring shaft is a hollow pipe, and the steam inlet and the steam outlet are formed at the external end parts of the stirring shaft.

Description

(1) Technical field [0001] The invention relates to the field of material drying equipment, in particular to an improved vacuum rake dryer. (2) Background technology [0002] Vacuum rake dryer is a traditional drying equipment with simple structure, convenient operation and strong applicability. It is mainly used in the fields of medicine, food, light industry, chemical industry, etc. When the traditional vacuum rake dryer dries the material, the material enters the shell from the feeding device, and is stirred by the rake teeth that are constantly rotating forward and reverse, and the material along the axis Walking back and forth, the surface in contact with the inner wall of the shell is constantly renewed, and is indirectly heated by the steam of the shell, evenly stirred and crushed by the rake teeth, so that the water in the material is vaporized, and under the action of the vacuum system, the water inside the material is Parts and surface moisture are more advantageo...

AI Technical Summary

Problems solved by technology

[0002] Vacuum rake dryer is a traditional drying equipment with simple structure, convenient operation and strong applicability. It is mainly used in the fields of medicine, food, light industry, chemical industry, etc. When the traditional vacuum rake dryer dries the material, the material enters the shell from the feeding device, and is stirred by the rake teeth that are constantly rotating forward and reverse, and the material along the axis Walking back and forth, the surface in contact with the inner wall of the shell is constantly renewed, and is indirectly heated by the steam of the shell, evenly stirred and crushed by the rake teeth, so that the water in the material is vaporized, and under the action of the vacuum system, the water inside the material is Parts and surface moisture are more advantageously discharged, and the vaporized water is discharged from the outlet of the vacuum pump through the dry dust collector, wet dust collector and condenser, but since the heating is through steam (hot water) only to a single surface of the shell Circular heating, the material is heated with the continuous contact with the surface of the shell, so that the moisture in the material is vaporized and contacted by heat, because the heating is only provided by the surface of the shell, which results in a long time for the temperature to be transmitted to the entire material and low production efficiency. The energy of electricity and steam consumes a lot relatively, and because the temperature source is on the surface of the shell, there is only a single heat cycle, and the temperature penetrating into the middle of the material is very different from the temperature of the shell wall. There is a phenomenon of material accumulation, it is not easy to fall off, and the product quality is unstable due to agglomeration

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