A defrosting system of an air-cooled refrigerator and a defrosting control method thereof

Abstract

The invention discloses a defrosting system of an air cooling refrigerator and a defrosting control method of the defrosting system of the air cooling refrigerator. The defrosting system of the air cooling refrigerator comprises an evaporator, electric heating tubes, a controller, an evaporator temperature sensor, a water pan and a freezing chamber temperature sensor, one or more electric heating tubes are fixed to a heat exchange tube of the evaporator and connected with the controller, the evaporator wall face temperature sensor is arranged on the surface of the heat exchange tube of the evaporator and connected with the controller, the freezing chamber temperature sensor is installed on the inner wall of an air cooling refrigerator freezing chamber and connected with the controller, and the water pan is arranged under the evaporator. According to the control method of the defrosting system of the air cooling refrigerator, the controller is adopted to detect the temperature of the wall face of the evaporator and the temperature of the freezing chamber, and the detected temperatures are combined with the accumulated running time of a compressor or the total running time of the compressor to judge whether defrosting should be performed or not; when the temperature of refrigerant in the heat exchange tube T>=T3 or the defrosting time t>=t2, the defrosting process is stopped; when defrosting water is discharged out of the refrigerator, the refrigerator is started again to enter the next refrigerating circulation. According to the defrosting system and the defrosting method, defrosting is uniform, the defrosting time is shortened, the electric heating defrosting efficiency is improved, and energy consumption of the refrigerator is reduced.

Description

technical field

[0001] The invention belongs to the technical field of refrigerator manufacturing, and in particular relates to a defrosting system of an air-cooled refrigerator and a defrosting control method thereof. Background technique

[0002] Frosting on the evaporator of an air-cooled refrigerator will increase the thermal resistance between the evaporator and the air in the freezer, hindering the heat exchange on the surface of the evaporator, thereby affecting the cooling effect and increasing power consumption. Therefore, the air-cooled refrigerator must be defrosted in time. The main defrosting method of cold refrigerators is electric heating defrosting. There are two kinds of defrosting by electric heating method: one is to defrost by quartz tube radiation; the other is to defrost by using aluminum electric heating wire arranged outside the evaporator. The defrosting device of a general refrigerator includes an evaporator, a defrosting heating pipe, a water tray...

Examples

Embodiment 1

[0028] Such as image 3 As shown, the control method of the defrosting system of the air-cooled refrigerator in this embodiment includes the following steps:

[0029] Step 1: When the air-cooled refrigerator is in cooling operation, the compressor starts, and the controller 3 starts to accumulate the running time of the compressor. When the controller 3 detects that the accumulated running time of the compressor is t 累积 ≥t 1 , t 1 =60min, evaporator heat exchange tube wall temperature Te≤T 1 ,T 1 =-30℃, and freezer temperature T 冷冻 ≥T 2 when T 2 =-20°C; or when the total running time of the compressor reaches the set defrosting cycle t 周期 , enter the defrosting process;

[0030] Step 2: During defrosting, the controller 3 turns off the compressor, turns on the defrosting electric heating circuit to heat the electric heating wire 9, and at the same time the controller 3 starts timing the defrosting time; the electric heating tube 2 transfers heat to the evaporator 1 Th...

Embodiment 2

[0034] Such as image 3 As shown, the control method of the defrosting system of the air-cooled refrigerator in this embodiment includes the following steps:

[0035] Step 1: When the air-cooled refrigerator is in cooling operation, the compressor starts, and the controller 3 starts to accumulate the running time of the compressor. When the controller 3 detects that the accumulated running time of the compressor is t 累积 ≥t 1 , t 1 =600min, evaporator heat exchange tube wall temperature Te≤T 1 ,T 1 =-5℃, and freezer temperature T 冷冻 ≥T 2 when T 2 =-5°C; or when the total running time of the compressor reaches the set defrosting cycle t 周期, enter the defrosting process;

[0036] Step 2: During defrosting, the controller 3 turns off the compressor, turns on the defrosting electric heating circuit to heat the electric heating wire 9, and at the same time the controller 3 starts timing the defrosting time; the electric heating tube 2 transfers heat to the evaporator 1 The ...

Embodiment 3

[0040] Such as image 3 As shown, the control method of the defrosting system of the air-cooled refrigerator in this embodiment includes the following steps:

[0041] Step 1: When the air-cooled refrigerator is in cooling operation, the compressor starts, and the controller 3 starts to accumulate the running time of the compressor. When the controller 3 detects that the accumulated running time of the compressor is t 累积 ≥t 1 , t 1 =100min, evaporator heat exchange tube wall temperature Te≤T 1 ,T 1 =-20℃, and freezer temperature T 冷冻 ≥T 2 when T 2 =-15°C; or when the total running time of the compressor reaches the set defrosting cycle t 周期 , enter the defrosting process;

[0042] Step 2: During defrosting, the controller 3 turns off the compressor, turns on the defrosting electric heating circuit to heat the electric heating wire 9, and at the same time the controller 3 starts timing the defrosting time; the electric heating tube 2 transfers heat to the evaporator 1 T...

technical field

[0001] The invention belongs to the technical field of refrigerator manufacturing, and in particular relates to a defrosting system of an air-cooled refrigerator and a defrosting control method thereof. Background technique

[0002] Frosting on the evaporator of an air-cooled refrigerator will increase the thermal resistance between the evaporator and the air in the freezer, hindering the heat exchange on the surface of the evaporator, thereby affecting the cooling effect and increasing power consumption. Therefore, the air-cooled refrigerator must be defrosted in time. The main defrosting method of cold refrigerators is electric heating defrosting. There are two kinds of defrosting by electric heating method: one is to defrost by quartz tube radiation; the other is to defrost by using aluminum electric heating wire arranged outside the evaporator. The defrosting device of a general refrigerator includes an evaporator, a defrosting heating pipe, a water tray...

Examples

Embodiment 1

[0028] Such as image 3 As shown, the control method of the defrosting system of the air-cooled refrigerator in this embodiment includes the following steps:

[0029] Step 1: When the air-cooled refrigerator is in cooling operation, the compressor starts, and the controller 3 starts to accumulate the running time of the compressor. When the controller 3 detects that the accumulated running time of the compressor is t 累积 ≥t 1 , t 1 =60min, evaporator heat exchange tube wall temperature Te≤T 1 ,T 1 =-30℃, and freezer temperature T 冷冻 ≥T 2 when T 2 =-20°C; or when the total running time of the compressor reaches the set defrosting cycle t 周期 , enter the defrosting process;

[0030] Step 2: During defrosting, the controller 3 turns off the compressor, turns on the defrosting electric heating circuit to heat the electric heating wire 9, and at the same time the controller 3 starts timing the defrosting time; the electric heating tube 2 transfers heat to the evaporator 1 Th...

Embodiment 2

[0034] Such as image 3 As shown, the control method of the defrosting system of the air-cooled refrigerator in this embodiment includes the following steps:

[0035] Step 1: When the air-cooled refrigerator is in cooling operation, the compressor starts, and the controller 3 starts to accumulate the running time of the compressor. When the controller 3 detects that the accumulated running time of the compressor is t 累积 ≥t 1 , t 1 =600min, evaporator heat exchange tube wall temperature Te≤T 1 ,T 1 =-5℃, and freezer temperature T 冷冻 ≥T 2 when T 2 =-5°C; or when the total running time of the compressor reaches the set defrosting cycle t 周期, enter the defrosting process;

[0036] Step 2: During defrosting, the controller 3 turns off the compressor, turns on the defrosting electric heating circuit to heat the electric heating wire 9, and at the same time the controller 3 starts timing the defrosting time; the electric heating tube 2 transfers heat to the evaporator 1 The ...

Embodiment 3

[0040] Such as image 3 As shown, the control method of the defrosting system of the air-cooled refrigerator in this embodiment includes the following steps:

[0041] Step 1: When the air-cooled refrigerator is in cooling operation, the compressor starts, and the controller 3 starts to accumulate the running time of the compressor. When the controller 3 detects that the accumulated running time of the compressor is t 累积 ≥t 1 , t 1 =100min, evaporator heat exchange tube wall temperature Te≤T 1 ,T 1 =-20℃, and freezer temperature T 冷冻 ≥T 2 when T 2 =-15°C; or when the total running time of the compressor reaches the set defrosting cycle t 周期 , enter the defrosting process;

[0042] Step 2: During defrosting, the controller 3 turns off the compressor, turns on the defrosting electric heating circuit to heat the electric heating wire 9, and at the same time the controller 3 starts timing the defrosting time; the electric heating tube 2 transfers heat to the evaporator 1 T...

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