Multi-functional heat pump drying device

Abstract

A multi-functional heat pump drying device comprises a drying chamber and a heat pump unit. A fresh air inlet is formed in the drying chamber, and the heat pump unit comprises a compressor, a condenser and an evaporator; a drying area and an air return area are arranged in the drying chamber, and the air inlet end of the condenser is arranged next to a fresh air inlet; the air outlet end of the condenser communicates with the drying area through an inner circulation draught fan; the multi-functional heat pump drying device further comprises a sensible heat exchanger which internally comprises a first air inlet, a first air outlet, a second air inlet and a second air outlet, hot air discharged from the air outlet end of the condenser passes through the drying area and the air return area successively, and then the air outlet end of the condenser communicates with the first air inlet; the first air outlet communicates with an air inlet of the evaporator, and an air outlet of the evaporator communicates with the second air inlet; the drying chamber of one side of the air outlet of the evaporator is provided with a cold air exhauster, and the second air outlet communicates with the air inlet end of the condenser; the drying chamber of one side of the air return area is provided with a hot air exhausting door; and the most suitable working mode is automatically selected under different working conditions, and product operation is easy.

Description

technical field [0001] The invention relates to the field of heat pump drying equipment, in particular to a multifunctional heat pump drying device. Background technique [0002] Heat pumps have the energy-saving effect of high-efficiency heating, and at the same time have the characteristics of generating cooling capacity while heating. Therefore, heat pumps have been widely used in the field of drying and dehumidification. At present, heat pump drying equipment is mainly divided into individual functions with waste heat recovery. There are two types of hot air function and hot air belt dehumidification function. The former has the advantages of simple structure and high heating energy efficiency. However, this technology is not effective in dealing with low-temperature drying in high humidity environments. The high relative humidity of the environment causes low drying efficiency, and the latter has the advantage of outputting hot air with a lower dew point, which can real...

AI Technical Summary

Problems solved by technology

[0002] Heat pumps have the energy-saving effect of high-efficiency heating, and at the same time have the characteristics of generating cooling capacity while heating. Therefore, heat pumps have been widely used in the field of drying and dehumidification. At present, heat pump drying equipment is mainly divided into individual functions with waste heat recovery. There are two types of hot air function and hot air belt dehumidification function. The former has the advantages of simple structure and high heating energy efficiency. However, this technology is not effective in dealing with low-temperature drying in high humidity environments. The high relative humidity of the environment causes low drying efficiency, and the latter has the advantage of outputting hot air with a lower dew point, which can realize rapid drying of materials at a lower temperature using air with a lower relative humidity, but the disadvantage of this technology is that when When the moisture content of the material is low, the sensible heat energy consumption of the dehumidification surface cooler greatly exceeds the dehumidification energy consumption, especially in the high temperature and low humidity working conditions, the excessive energy consumption of condensation dehumidification is obviously not cost-effective

According to the above analysis, the single hot air technology and the hot air belt dehumidification technology have their own advantages and disadvantages, and have their own advantages and disadvantages under different working conditions. The former is suitable for high temperature and low humidity conditions, and the latter is suitable for low temperature and high humidity conditions. Therefore, the two technologies The adaptability is flawed. For the drying of a wide variety of agricultural products in different seasons, it is obviously insufficient to have a wide range of adaptability. Moreover, even if only a single product is dried in a certain season, its working conditions are constantly changing during the drying process. Changes occur, and corresponding technologies must be adopted according to different drying conditions to achieve the best results

[0003] In addition, the structure and control of heat pump drying equipment with separate hot air and hot air with dehumidification are quite different. If the functions of both are taken into account in the design, the structure will be more complicated, and the function switching will be more complicated. When it is applied to the drying of agricultural products, most of its users are farmers who have not received special training, and the difficulty of operation based on the equipment will make it difficult to popularize the application of this technology

Images