A heat pump air conditioner using electric auxiliary heat to improve defrosting and dehumidification effects

Abstract

The invention discloses a heat pump air conditioner, which includes an outdoor unit, an indoor unit, a gas pipe and a liquid pipe, the outdoor unit and the indoor unit are connected through the gas pipe and the liquid pipe, the indoor unit includes a casing, and the casing is provided with an air inlet and an outlet. In the air outlet, an indoor fan, an indoor heat exchanger and an electric heater are arranged in the casing, an air inlet grille for closing or opening the air inlet is arranged on the air inlet, and a grille for closing or opening the air outlet is arranged on the air outlet. Air outlet grille, when the air conditioner reverse cycle defrosting, the control will turn on the electric heater, and drive the air inlet and outlet grille to close the air inlet and outlet, so that the air inside the cabinet is isolated from the indoor air. Driven by the fan, the circulating air can quickly transfer the heat generated by the electric heater to the low-temperature refrigerant through the finned tube heat exchanger, which can not only quickly remove the frost, but also prevent the low-temperature refrigerant from absorbing heat from the room , improve indoor comfort, and apply the present invention can also improve the dehumidification effect of the air conditioner.

Description

technical field [0001] The invention relates to the technical field of heating, ventilating and air-conditioning heat pumps, in particular to a heat pump air conditioner which utilizes the electric auxiliary heat of an indoor unit to improve defrosting and dehumidification effects. Background technique [0002] When the heat pump air conditioner is heating in winter, the outdoor heat exchanger will generally frost, which will seriously affect the heat exchange of the heat exchanger, so periodic defrosting is required to maintain normal heating operation. The reverse cycle defrosting method used in defrosting, in order to avoid blowing cold air into the room, the indoor fan generally stops running. Due to the poor heat transfer effect of natural convection, it will cause unclean defrosting, compressor low-pressure shutdown protection, and room temperature drop A series of problems such as severe (seriously affecting indoor comfort) and other defrosting methods, such as electr...

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Problems solved by technology

[0002] When the heat pump air conditioner is heating in winter, the outdoor heat exchanger will generally frost, which will seriously affect the heat exchange of the heat exchanger, so periodic defrosting is required to maintain normal heating operation. The reverse cycle defrosting method used in defrosting, in order to avoid blowing cold air into the room, the indoor fan generally stops running. Due to the poor heat transfer effect of natural convection, it will cause unclean defrosting, compressor low-pressure shutdown protection, and room temperature drop A series of problems such as severe (seriously affecting indoor comfort) and other defrosting methods, such as electric heating defrosting, thermal storage defrosting, etc., although the defrosting effect is good and the room temperature has been greatly improved, but due to the initial investment Due to its large size and complex processing, it is difficult to apply it to a small heat pump air conditioner with a compact structure, so it is necessary to develop a new defrosting method to solve this problem

[0003] At present, the air intake volume of the indoor unit of the air conditioner is generally adjusted in stages, and the adjustment ability is limited. It is impossible to achieve a good match between the air volume and the indoor cold, heat or humidity load. Although it can be achieved through frequency conversion adjustment, but because it is too expensive and The control is too complicated, so the current frequency conversion technology is mainly used in multi-connected and large-scale air-conditioning systems. The existing small household air conditioners are basically fixed-frequency settings, which makes the energy efficiency of the air conditioner low under partial load, especially in dehumidification. Since the temperature and humidity of indoor air vary greatly throughout the year, and in order to avoid blowing cold air into the room in the existing dehumidification process, the indoor fans are all running at the lowest speed (with constant air volume), which obviously cannot match the indoor humidity load , when the humidity load is large, the slow dehumidification speed will seriously affect the comfort of the room, so it is necessary to solve this problem to improve the cooling, heating and dehumidification performance of the air conditioner

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