Heat pump drying device

Abstract

The invention discloses a heat pump type drying device which comprises a compressor, a condenser, an evaporator and a drying chamber. The condenser, the evaporator and the drying chamber are arranged in a closed-loop air way. Air in the closed-loop air way can sequentially flow through the evaporator, the condenser and the drying chamber to form closed circulation. The heat pump drying device further comprises a heat pipe, an evaporation section of the heat pipe is connected with the outer wall of the compressor in a heat conduction manner, and a condensation section of the heat pipe is located in the closed-loop air way. By means of the heat pump type drying device, waste heat of the compressor can be transmitted to the closed-loop air way, heat input of the system is increased, meanwhile, overheat of the compressor can be prevented, it is ensured that the exhaust temperature and pressure of the compressor are stable, and stability of the working condition of the system is maintained.

Description

technical field [0001] The invention relates to the technical field of drying, in particular to a heat pump drying device. Background technique [0002] Please refer to figure 1 , figure 1 It is a schematic diagram of the principle of an existing heat pump drying device. [0003] Generally, a heat pump drying device has an air circulation circuit and a refrigerant circulation circuit, wherein the air circulation circuit includes a drying chamber 5', a fan, a condenser 2' and an evaporator 3', and these four components are placed in a closed air duct , the fan drives the air circulation to establish the wind field of the closed-loop system. The hollow arrow in the figure shows the flow path of the air; the refrigerant circulation circuit includes a compressor 1', a condenser 2', an evaporator 3' and a throttling Element 4'. [0004] When working, first start the fan to establish the wind field of the closed-loop system, then start the compressor 1', the heat pump system w...

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Problems solved by technology

[0005] As the drying process proceeds, the moisture content of the load in the drying chamber 5' gradually decreases, and the heat load required by the load also gradually decreases. In order to ensure the energy efficiency of the system and the safety and reliability of the work, an auxiliary fan 6' is generally installed to Exclude the redundant load of the compressor 1'; at present, about 40% of the electric power input by the compressor 1' is dissipated in the form of heat energy, resulting in a large amount of energy waste

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