Air path opening and closing combined drying device

Abstract

The invention relates to an air path opening and closing combined drying device, and the device comprises a heating and dehumidifying room, wherein the interior of the heating and dehumidifying room is divided into at least one inner cavity and at least one outer cavity through a partition plate; the outer cavity is communicated with ambient air, and the inner cavity is communicated with a curingbarn to form a circulating channel of drying airflow; the side wall of the inner cavity or the partition plate is further provided with a fresh air opening and a moisture discharging opening. When thedrying airflow is in closed circulation, the fresh air opening and the moisture discharging opening are closed at the same time, and the drying airflow circularly moves in a closed circulation channel formed by the inner cavity and the curing barn; when the drying airflow is partially circulated in an open circuit mode, the fresh air opening and the moisture discharging opening are opened at thesame time, warm and wet return air in the curing barn enters the inner cavity, part of the warm and wet return air entering the inner cavity is discharged out of the inner cavity through the moisturedischarging opening, and meanwhile environment fresh air is supplemented into the inner cavity through the fresh air opening. The method solves the problems that in the yellowing period, cells such asfresh tobacco leaves are still in the aerobic respiration and living body metabolism stages, and the autologous heat productivity of the tobacco leaves is large, so that more heat is generated in thecuring barn, and the dry-bulb temperature exceeds the target value.

Description

technical field [0001] The invention relates to the technical field of heat pump drying, in particular to a drying device combined with gas path opening and closing. Background technique [0002] Since green development has become the mainstream concept in society, heat pumps have gradually become the leading technology in the drying field of agricultural products, wood, paper, seafood, etc. instead of coal-fired hot air stoves, gas hot air stoves, and oil-fired hot air stoves. [0003] Heat pump drying of tobacco leaves is the focus of heat pump drying of agricultural products. After years of research and development by many heat pump companies, the heat pump technology for tobacco leaf curing has gradually matured. The heat pump tobacco curing room that cooperates with the intensive curing room and insulation board room stipulated in the 2009 National Tobacco Administration Document No. 418 is gradually being promoted in the smoking area. [0004] During the 170-hour baki...

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Problems solved by technology

[0009] This kind of heat pump system with "one machine, three functions" has added the function of internal dehumidification and external heat removal in addition to the main functions of external heat absorption and internal heating, internal dehumidification and internal heating, and solves the problem of excess heat inside the barn during the yellowing period. Outflow problem, but the structure of the heat pump system is too complicated. On the pipeline between the compressor, the throttle valve and the three heat exchangers, a four-way valve, two solenoid valves, and three one-way valves are installed, resulting in The stability and reliability of the heat pump system are greatly reduced

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