Direct-heat and constant-temperature circulating heat pump drying machine

Abstract

The invention relates to a direct-heat and constant-temperature circulating heat pump drying machine. The direct-heat and constant-temperature circulating heat pump drying machine comprises a machine case, a draught fan arranged in the machine case, an evaporator arranged on the right side of the draught fan, a condenser arranged on the right side of the evaporator, a circulating loop connected with the evaporator and the condenser, a throttling device, a liquid storage tank, a compressor, an air inlet pipe arranged on the throttling device, an electric adjusting valve arranged at the tail end of the air inlet pipe, an air supply pipe arranged on the left side of the condenser, an air returning port formed in the tail end of the air supply pipe, an air outlet formed in the right side of the condenser, and a centrifugal fan arranged in the air outlet, wherein the throttling device, the liquid storage tank and the compressor are arranged on the circulating loop. According to the direct-heat and constant-temperature circulating heat pump drying machine, the air volume can be adjusted through the electric adjusting valve and the centrifugal fan, and the constant-temperature air discharging is achieved; a circulating air flue is formed through the air outlet and the air returning port, exhausted waste heat can be recycled, and the drying efficiency is high. Heat is absorbed through the evaporator, heating of the evaporator is improved, the effect of energy saving is achieved, the work efficiency ratio of a main machine is increased, meanwhile, the structure is simple, and using is convenient.

Description

technical field [0001] The invention relates to a heat pump dryer, in particular to a direct heating constant temperature circulation heat pump dryer. Background technique [0002] The waste heat in the traditional flue-cured room is not recovered, and it is directly discharged to the outside, which wastes a lot of heat energy. Moreover, the heat source of the traditional dryer cannot quickly provide heat with a constant temperature, the heating speed is slow, the temperature is not constant, and the hot air is directly discharged to the outside, resulting in waste heat recovery. Low utilization. [0003] For example, the Chinese patent number is "201210202763.5", and the patent name is "High-efficiency and energy-saving dense flue-cured tobacco room", which mainly uses a rotary air heat exchanger for heat exchange. The combustion efficiency of the furnace is improved by using part of the flue gas after heat exchange to preheat the air required by the furnace. Although it c...

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Problems solved by technology

[0002] The waste heat in the traditional flue-cured room is not recovered, and it is directly discharged to the outside, which wastes a lot of heat energy. Moreover, the heat source of the traditional dryer cannot quickly provide heat with a constant temperature, the heating speed is slow, the temperature is not constant, and the hot air is directly discharged to the outside, resulting in waste heat recovery. low utilization

[0003] For example, the Chinese patent number is "201210202763.5", and the patent name is "High-efficiency and energy-saving dense flue-cured tobacco room", which mainly uses a rotary air heat exchanger for heat exchange. The combustion efficiency of the furnace is improved by using part of the flue gas after heat exchange to preheat the air required by the furnace. Although it can realize the utilization of waste heat, the temperature of the waste heat can only be increased, and it does not have the function of constant temperature. Complex structure, complex use, inconvenient, high cost of mechanical production

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