Method for protecting air conditioner against refrigerant shortage and air conditioner

Abstract

The invention provides a method for protecting an air conditioner against refrigerant shortage. The method comprises the steps of detecting first exhaust pressure P1, first air return pressure P2, aninner side environment temperature T1 and an outer side environment temperature T2 before a unit is started; detecting second exhaust pressure Py1, second air return pressure Py2, an exhaust temperature Td and an air return temperature Ts within preset time after the unit is started; calculating a current theoretical shutdown pressure Pt, and comparing the current theoretical shutdown pressure Ptwith a first threshold condition to obtain a first determination result; determining a second threshold condition, and comparing the second exhaust pressure Py1 and the second return air pressure Py2detected in the preset time after startup with a second threshold condition to obtain a second determination result; and according to the first determination result and the second determination result, determining a lack level of a refrigerant of an air conditioning unit, and executing protection treatment according to a refrigerant shortage condition. A situation of misjudgment of lack of the refrigerant is effectively prevented by carrying out dual determination on the pressure during shutdown and operation of the air conditioning unit.

Description

technical field [0001] The present invention and the technical field of air conditioners, in particular, relate to an air conditioner lacking refrigerant protection method and an air conditioner. Background technique [0002] Refrigerant is the blood of the air-conditioning system. During the operation of the air conditioner, the physical state of the refrigerant changes, and heat is transported to achieve the effect of cooling and heating. The lack of refrigerant in the system will cause the cooling effect of the unit to decrease or even disappear. Insufficient refrigerant volume will also lead to poor heat dissipation of the compressor, and the compressor coil temperature will be too high, resulting in damage and burnout of the compressor. [0003] However, due to the limitations of installation methods and processes during the use of air conditioners, fluorine deficiency often occurs, resulting in a decrease in the cooling effect of the air conditioner, or no cooling, aff...

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Problems solved by technology

[0002] Refrigerant is the blood of the air-conditioning system. During the operation of the air conditioner, the heat is transferred through the state change of the refrigerant to achieve the effect of cooling and heating. Insufficient refrigerant in the system will reduce the cooling effect of the unit, or even disappear.

Insufficient amount of refrigerant will also lead to poor heat dissipation effect of the compressor, and the temperature of the compressor coil is too high, resulting in damage and burning of the compressor

[0003] However, due to the limitations of installation methods and processes during the use of air conditioners, fluorine deficiency often occurs, resulting in a decrease in the cooling effect of the air conditioner, or no cooling, which affects the user's use effect and reduces the user experience

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