Refrigerant-deficiency protection method for air conditioner and air conditioner
A technology of refrigerants and air conditioners, which is applied in the field of air conditioning and air conditioning, and can solve problems such as non-refrigeration, burning, and affecting the user's use effect
Active Publication Date: 2021-03-05
NINGBO AUX ELECTRIC
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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
Method used
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Embodiment 1
[0082] This embodiment provides an air conditioner lack of refrigerant protection method, including the following steps:
[0083] S100, obtain the rated shutdown pressure P0 of the air-conditioning unit measured under the rated cooling condition (inside 27°, outside 35°), the rated discharge pressure Pyd0, the rated return air pressure Pys0, and the rated discharge temperature Td0 of the unit during operation , Rated return air temperature Ts0.
[0084] S200. Before each start-up of the air conditioning unit, first detect the first exhaust pressure P1, the first return air pressure P2, the outer ambient temperature T1, and the inner ambient temperature T2 of the unit, and determine the relationship between the first exhaust pressure P1 and the first return air pressure. The size relationship of air pressure P2. in:
[0085] If P1=P2, then calculate the theoretical shutdown pressure Pt when the air conditioning unit is shut down:
[0086] Pt=P1+a*P1(T1-35)k+b*P2(T2-27)k
[...
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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 conditioning, in particular, relate to an air conditioner lack of refrigerant protection method and the air conditioner. Background technique [0002] Refrigerant is the blood of the air conditioning system. During the operation of the air conditioner, the state of the refrigerant changes to transfer heat 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 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 use...
Claims
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IPC IPC(8): F24F11/32F24F11/64F24F11/70F24F11/88F24F110/10F24F110/12F24F140/10
CPCF24F11/32F24F11/64F24F11/70F24F11/88F24F2110/10F24F2110/12F24F2140/10
Inventor 张中强左泽明李海利田涛杨明登
Owner NINGBO AUX ELECTRIC