Heat pump type tail heat recovery counter flow dryer

Abstract

The invention discloses a heat pump type tail heat recovery counter flow dryer. A draught hood of a dryer body is connected with a draught fan. The draught fan is connected with an evaporator of a heat pump system through a cyclone dust collector and then emptied. The evaporator of the heat pump system is connected with a host machine through a coolant pipe. The host machine is connected with a condenser through a coolant pipe. The air outlet end of an air blower is connected with an air intake hood through the condenser. An impeller of the draught fan is provided with blades which are in a hollow inverted water drop shape, and a back plate is of a dish-shaped structure. The contour line of the draught fan is an involute. The dryer is provided with the draught fan, a heat exchanger and closed conical hoppers arranged below a sieve plate steel strip, and axial-flow fans are arranged in the conical hoppers, so that through type counter flow low-temperature drying of materials is achieved, dust on the impeller of the draught fan is cleaned away in real time, the strength of the impeller of the draught fan is improved, stability is enhanced, safety accidents caused by dust accumulation are effectively eradicated, and the application prospects are wide.

Description

technical field [0001] The invention relates to a drying machine, in particular to a heat pump tail heat recovery countercurrent drying machine in which a fan does not accumulate dust. Background technique [0002] People generally refer to drying with a drying temperature below 60 degrees Celsius as low-temperature drying. Low-temperature drying is widely used in the drying of heat-sensitive materials such as crop seeds, Chinese medicinal materials, and biological products. Due to its mature technology, strong adaptability, low operating cost and high reliability, hot air dryer is still one of the first choice equipment for low temperature drying. Low-temperature drying is less easy to recover tail heat due to the lower exhaust temperature. If the penetration and countercurrent drying of materials can be realized in the hot-air low-temperature drying process, and the tail heat can be effectively recovered, it will be of great significance for improving drying efficiency an...

AI Technical Summary

Problems solved by technology

Once part of the hardened dust is shaken off, it will immediately leave the dynamic rotation balance of the induced draft fan, and then generate strong vibration, which may cause serious personnel and equipment safety accidents

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