Defrosting method for air-cooled refrigerator

Abstract

This invention discloses a defrosting method for a frost-free refrigerator, with the following specific steps: Step 1: The refrigerator enters defrosting mode; Step 2: After entering defrosting mode, the defrosting heater is turned on, but the fan is not turned on. After heating for time t1, a temperature difference will appear between the top and bottom of the finned evaporator; Step 3: The current temperature of the defrosting sensor is detected as 'a'; Step 4: The fan is turned on for 1 second and then off for 3 seconds; Step 5: The current temperature of the defrosting sensor is detected as 'b'; Step 6: If b ≥ T1, the defrosting mode is exited; Step 7: If b < T1, the temperature difference b - a before and after the defrosting sensor and fan are turned on and off is further determined; Step 8: If b - a ≥ T2, Step 2 is continued, and the fan is off for 3 minutes; Step 9: If b - a < T2, Step 1 is continued, and the fan is turned on for 1 second and then off for 3 seconds. This invention utilizes forced convection by a fan to improve defrosting efficiency.

Description

Technical fields:

[0001] This invention relates to a defrosting method for a frost-free refrigerator, which belongs to the field of household appliance technology. Background technology:

[0002] Currently, frost-free refrigerators rely on natural convection or thermal radiation to transfer heat to every corner of the evaporator during defrosting. The heat in existing frost-free refrigerators is dissipated slowly, which is extremely inefficient.

[0003] Therefore, it is indeed necessary to improve existing technologies to address their shortcomings. Summary of the Invention:

[0004] The present invention provides a defrosting method for an air-cooled refrigerator to solve the problems existing in the prior art, which utilizes a fan to force convection to improve defrosting efficiency.

[0005] The technical solution adopted in this invention is as follows: a defrosting method for a frost-free refrigerator, the specific steps of which are as follows:

[0006] Step 1: The refrigerator enters defrost mode;

[0007] Step 2: After the refrigerator enters defrost mode, the defrost heater turns on, but the fan does not turn on. After the defrost heater has been heating for time t1, a temperature difference will appear between the top and bottom of the finned evaporator.

[0008] Step 3: Detect the current temperature of the defrost sensor as a;

[0009] Step 4: Turn on the fan at this time, and turn it off for 3 seconds after it starts running for 1 second.

[0010] Step 4: Detect the current temperature of the defrost sensor as b;

[0011] Step 5: If b ≥ T1, then exit defrost mode;

[0012] Step 6: If b < T1, then further determine the temperature difference ba before and after the defrost sensor fan starts and stops;

[0013] Step 7: If ba≥T2, then continue to Step 2 and shut down the fan for 3 minutes;

[0014] Step 8: If ba < T2, then continue with step 4, repeating the process of starting the fan for 1 second and then stopping it for 3 seconds.

[0015] Furthermore, t1 = 3min.

[0016] Furthermore, T1 = 10℃.

[0017] Furthermore, T2 = 1℃.

[0018] Furthermore, the defrosting heater is a steel pipe heater or a quartz tube heater.

[0019] The present invention has the following beneficial effects: The defrosting method of the air-cooled refrigerator of the present invention turns on the defrosting heater, and the hot air at the bottom blows to the top. However, in order to prevent the hot air from blowing into the freezer compartment, the fan is turned on for a while and then turned off. After the defrosting heater heats for a period of time and the hot air accumulates, the fan is turned on again for a while, thereby improving the heat dissipation efficiency. Attached image description:

[0020] Figure 1 This is a flowchart of the defrosting method for the air-cooled refrigerator of the present invention. Detailed implementation method:

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] The defrosting method for a frost-cooled refrigerator of the present invention comprises the following specific steps:

[0023] Step 1: The refrigerator enters defrost mode;

[0024] Step 2: After the refrigerator enters defrost mode, the defrost heater turns on, but the fan does not turn on. After the defrost heater has been heating for t1 (t1 = 3 minutes), a certain temperature difference will appear between the top and bottom of the finned evaporator.

[0025] Step 3: Detect the current temperature of the defrost sensor as a;

[0026] Step 4: Turn on the fan at this time. Turn on the fan for 1 second and then turn it off for 3 seconds. Turn the fan on and off for a while so that the hot air is only blown into the space where the finned evaporator is located, and minimize the hot air in the freezer or refrigerator compartment.

[0027] Step 4: Detect the current temperature of the defrost sensor as b;

[0028] Step 5: If b ≥ T1 (T1 = 10)℃, then exit defrosting mode;

[0029] Step 6: If b < T1℃, then further determine the temperature difference ba before and after the defrost sensor fan starts and stops;

[0030] Step 7: If ba≥T2 (T2=1℃), then continue to Step 2 and stop the fan for 3 minutes;

[0031] Step 8: If ba < T2, then continue with step 4, repeating the process of starting the fan for 1 second and then stopping it for 3 seconds.

[0032] The defrosting method of the air-cooled refrigerator of the present invention involves intermittently turning on the fan when the defrosting heater is turned on, thereby forcing convection to efficiently transport heat to all corners of the space where the finned evaporator is located, thus achieving efficient defrosting.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A defrosting method for a frost-free refrigerator, characterized in that: The specific steps are as follows: Step 1: The refrigerator enters defrost mode; Step 2: After the refrigerator enters defrost mode, the defrost heater turns on, but the fan does not turn on. After the defrost heater has been heating for time t1, a temperature difference will appear between the top and bottom of the finned evaporator. Step 3: Detect the current temperature of the defrost sensor as a; Step 4: Turn on the fan at this time, and turn it off for 3 seconds after it starts running for 1 second. Step 5: Detect the current temperature of the defrost sensor as b; Step 6: If b ≥ T1, then exit defrost mode; Step 7: If b < T1, then further determine the temperature difference ba before and after the defrost sensor fan starts and stops; Step 8: If ba≥T2, then continue to Step 2 and shut down the fan for 3 minutes; Step 9: If ba < T2, then continue with step 4, repeating the process of starting the fan for 1 second and then stopping it for 3 seconds.

2. The defrosting method for a frost-free refrigerator as described in claim 1, characterized in that: t1 = 3 min.

3. The defrosting method for a frost-free refrigerator as described in claim 2, characterized in that: T1＝10℃。 4. The defrosting method for a frost-free refrigerator as described in claim 3, characterized in that: T2＝1℃。 5. The defrosting method for a frost-free refrigerator as described in claim 4, characterized in that: The defrosting heater is either a steel pipe heater or a quartz tube heater.

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