Heat pump drying device

Abstract

The invention discloses a heat pump drying device. The heat pump drying device comprises an evaporation room and a heat pump device, wherein the evaporation room comprises an evaporation room main body, a thermal insulation structure, a conveying device, an auxiliary drying device, a draught fan, an air distributing device, a material distributing device, a discharge device and a magnetizing device. According to the heat pump drying device disclosed by the invention, a mode of cooling at one section and heating at one section of the conventional heat pump drying device is changed into a mode of cooling at two sections and heating at two sections, so that high-temperature heat pump cycle has a high energy efficiency ratio under a high-temperature working condition, and low-temperature heat pump cycle has a high energy efficiency ratio under a low-temperature working condition; and the high-temperature heat pump cycle and the low-temperature heat pump cycle are superposed, so that the energy efficiency ratio under the same working condition state is greatly increased in comparison with that of the conventional mode of cooling at one section and heating at one section.

Description

technical field [0001] The invention relates to a heat pump, in particular to a multi-working-condition high-efficiency heat pump drying device. Background technique [0002] At present, the existing heat pump drying device uses the heat pump condenser to heat the circulating air, and then heats the working medium, so that the water in the working medium evaporates, and the circulating air is in a high-temperature and high-humidity state at this time; Cool down and dehumidify, discharge condensed water, the circulating air is in a low-temperature and low-humidity state at this time; then the circulating air is heated by the condenser again, and becomes a high-temperature and low-humidity circulating air, which leads to the evaporation chamber to heat the working medium to take away moisture and achieve the purpose of drying the working medium . Existing heat pump dryers use a single refrigerant, the adjustable range of evaporation temperature and condensation temperature is...

AI Technical Summary

Problems solved by technology

Existing heat pump dryers use a single refrigerant, the adjustable range of evaporation temperature and condensation temperature is narrow, and the greater the temperature difference between the two, the lower the energy efficiency ratio, which cannot well adapt to various drying requirements

The air volume of the evaporator and condenser of the existing heat pump dryer often adopts the same air volume, and the evaporator needs a large temperature difference in the dehumidification condition to ensure the dehumidification capacity and dehumidification efficiency, so the air volume is small; but the air heat exchange process of the condenser It is sensible heat heating process, small air volume leads to high condensation pressure, high compression ratio of compressor, not energy-saving; and in the drying process of working fluid, higher surface wind speed can increase the evaporation speed of its water and improve dehumidification Drying efficiency, the air volume required by the two is not the same

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