Air source heat pump hot-air fan with combined operating modes

Abstract

The invention discloses an air source heat pump hot-air fan with combined operating modes. A housing of an air source heat pump is divided into a first cavity and a second cavity. When an automatic valve is closed, a drying chamber is heated by relatively closed circulating air under the action of a condenser fan. When materials in the drying chamber are heated to a certain temperature, the humidity is increased, the automatic air valve is opened, and an air inlet of the evaporator is used as a fresh air inlet of the drying chamber. On the basis of the integral system structure and cold air utilization after heat exchange of an evaporator, opening and closing of the automatic valve are used as conversion conditions, a material drying way performing dehumidifying and humidity elimination simultaneously is created, and organic combination of various operating modes is realized. The integral function tendency of the system can be automatically, flexibly and conveniently changed, and different and conflicting requirements of various stages of material drying are met. In addition, energy efficiency ratio and material drying speed can be greatly increased, and equipment investment is saved.

Description

technical field [0001] The invention relates to an air source heat pump air blower used for material drying. Background technique [0002] Material drying generally uses air as the heating medium to heat the material with heat energy higher or significantly higher than the temperature of the material. The heated air contacts the surface of the material, the hot air cools down, and the temperature of the material absorbs heat rises. After the material is heated, From the surface to the inside, the water absorbs heat and evaporates or vaporizes. The water molecules and the heating medium become hot and humid air, and the dehumidification fan is discharged outside the drying room. [0003] The air source heat pump is mainly composed of a condenser, a condenser fan, a compressor, a throttling device, an evaporator, and an evaporator fan. loop loop. [0004] Drying chambers using air source heat pumps have been widely used in people's production activities, mainly of the dehumi...

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Problems solved by technology

[0007] Compared with the following dehumidification type, the energy efficiency ratio of the dehumidification type is much improved, but its disadvantages are: 1) Even if the waste heat is recovered, only about 35% can be recovered, and a large amount of heat is still discharged. Drying outdoors causes a lot of energy waste; 2) During the entire drying process of materials, the dehumidification effect (dehumidification rate) of the dehumidification type is much worse than that of the dehumidification type; 3 ) The fresh air for dehumidification and supplementation comes from the air in the environment without dehumidification treatment; the above three shortcomings reduce the drying speed of materials

[0009] The disadvantages of this technical solution are: 1) When the material in the drying room is initially heated, it is meaningless to cool and dehumidify the evaporator, because the temperature difference between the air temperature in the drying room and the ambient temperature is small, and the air in the drying room cannot reach the dew point for dehydration

On the contrary, due to the cooling of the evaporator, the initial heating time of the material in the drying chamber is significantly prolonged

2) The air source heat pump fan operates in a sealed or relatively sealed environment and cannot absorb heat from the external environment. A large part of the heating energy of the heat pump is offset by the condensation and dehumidification of the evaporator, and the energy efficiency ratio is only about 1.0. The energy efficiency ratio is too low, the heating rate of the material is slow, and the drying effect is only better than that of the resistance type, and the advantages of high-efficiency heating of the air source heat pump are not utilized, and the drying speed of the material is not as good as that of the dehumidification type air source heat pump

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