Combined opening and closing type circulating heat pump drying system

Abstract

The invention discloses a combined opening and closing type circulating heat pump drying system. The combined opening and closing type circulating heat pump drying system comprises a drying room, a heat pump drying subsystem and a drying air circulation subsystem, wherein the heat pump drying subsystem comprises a compressor, a main condenser, an indoor evaporator, an outdoor heat exchanger, a liquid storage device, a drying filter and a gas-liquid separator; the drying air circulation subsystem comprises an air supply port and an air return port, wherein the air supply port and the air returnport communicate with the drying room through an air duct, the main condenser is arranged at the position corresponding to the air return port, and an air supply fan is arranged at the air supply port; the air return port comprises a bypass air duct and a dehumidifying air duct, wherein the dehumidifying air duct communicates to the position where the main condenser is located by sequentially passing through an evaporation section of a heat pipe heat exchanger and a condensation section of the heat pipe heat exchanger from the drying room; and the bypass air duct communicates with the position where the main condenser is located through the drying room. According to the system, the working efficiency is high, the structure is simple, the size is small, working is carried out more stably,an open type function and a closed type function are provided, the heating speed of the system is fast, and dehumidification is still carried out in the defrosting process.

Description

technical field [0001] The invention relates to the technical field of drying equipment, in particular to a composite open-close cycle heat pump drying system. Background technique [0002] At present, the commonly used heat pump drying devices on the market are divided into open cycle heat pump drying devices and closed cycle heat pump drying devices. The open cycle heat pump drying device uses the evaporator to absorb heat in the outdoor environment, and uses the heat of the condenser to heat the materials in the drying room. When the temperature and humidity in the drying room reach the set value, part of the high-temperature and high-humidity air is discharged outside. A part of the new air is supplemented, and an air heat recovery device is usually provided to recover part of the heat of the exhausted air. The closed cycle heat pump drying device uses an evaporator to cool down the circulating air and condense the moisture in it to discharge, and then heat the air to t...

AI Technical Summary

Problems solved by technology

Chinese invention patent 201810116543.8 discloses an air source heat pump dryer with dual functions of open air energy and closed dehumidification. The heat recovery device uses an air heat recovery device, which still has complex air ducts and large volume.

The most critical thing is that the above three patents did not solve the problems of frequent defrosting in the traditional open cycle when the temperature was raised by the open cycle, the temperature of the drying room was greatly reduced by defrosting, and the excess heat in the drying system could not be discharged.

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