Defrosting system, refrigerator and control method

Abstract

The application discloses a defrosting system, a refrigerator and a control method, which comprise a protective cover, an evaporator and a heating device are arranged in the protective cover, the heating device is arranged below the evaporator, a temperature sensor is arranged on the top of the heating device, and the temperature sensor is used for detecting the temperature of the top of the heating device. The application can defrost the evaporator above through the heating device, accurately detect the temperature of the heating device through the temperature sensor arranged on the top of the heating device, accelerate defrosting, shorten the heating time of the heating device, ensure that the temperature of the freezing compartment of the air-cooled frost-free refrigerator does not increase too much within the shortened heating time, and enable the freezing compartment to preserve the food placed inside in a short time.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and more particularly to a defrosting system, a refrigerator, and a control method. Background Technology

[0002] In order to achieve frost-free operation, existing air-cooled frost-free refrigerators typically have a heater installed under the evaporator. The heater melts the frost that forms on the evaporator. However, considering the safety of the refrigerator, the surface temperature of the heater cannot be too high.

[0003] Existing solutions typically involve placing a temperature sensor on the upper part of the evaporator and using a low-power heater to heat it. During the heating process, when the temperature on the upper part of the evaporator reaches the preset value of the temperature sensor, the refrigerator will stop defrosting; or when the heater reaches its maximum working time, the refrigerator will stop defrosting.

[0004] However, the above solution has the following shortcomings: The inability to accurately detect the heater temperature results in slow defrosting and prolonged heating. Furthermore, prolonged heating prevents the freezer compartment from quickly dropping to a temperature suitable for preserving food, thus affecting food preservation. Summary of the Invention

[0005] In view of this, the present invention provides a defrosting system, a refrigerator, and a control method to solve the problems of refrigerators in the prior art being unable to accurately detect the temperature of the heater, resulting in slow defrosting and long heating times.

[0006] To achieve one or more of the above objectives or other objectives, the technical solution of the present invention is a defrosting system, including a protective cover, an evaporator and a heating device are provided inside the protective cover, the heating device is located below the evaporator, and a temperature sensor is provided on the top of the heating device for detecting the temperature of the top of the heating device.

[0007] Furthermore, an air duct is formed between the evaporator and the heating device, and a temperature sensor is installed in the air duct; The protective cover is equipped with an exhaust device corresponding to the air duct, and the exhaust device is used to blow airflow into the air duct.

[0008] A refrigerator comprising the defrosting system described above.

[0009] A method for controlling a refrigerator as described above includes the following steps: Step S1: When the refrigerator is powered on and the compressor's cumulative running time reaches the first preset time, the refrigerator is controlled to enter the defrosting stage, and the heating device is in operation during the defrosting stage. Step S2: Determine whether the temperature detected by the temperature sensor is within the preset temperature range; Step S3: When the determination is yes, adjust the working state of the refrigerator so that the temperature detected by the temperature sensor is maintained within the preset temperature range.

[0010] Further, in step S3, adjusting the refrigerator's operating state to maintain the temperature detected by the temperature sensor within the preset temperature range includes: Step S31: When the temperature detected by the temperature sensor reaches the first preset temperature T1, control the heating device to run for a second preset time. Step S32: When the temperature detected by the temperature sensor reaches the second preset temperature T2, the heating device is turned off for a third preset time and the defrosting stage is exited. Wherein, the first preset temperature T1 is the lower limit of the preset temperature range, and the second preset temperature T2 is the upper limit of the preset temperature range.

[0011] Furthermore, the first preset temperature T1 ranges from 200℃ to 350℃.

[0012] Furthermore, the range of the second preset temperature T2 is T2 > T1 + 2℃.

[0013] Furthermore, in step S31, when controlling the heating device to operate for a second preset time, the control method further includes: Determine whether the temperature detected by the temperature sensor has reached the third preset temperature T3; When the determination is yes, the heating device is stopped and the exhaust device is started to keep the temperature detected by the temperature sensor within the preset temperature range.

[0014] Furthermore, the value range of the third preset temperature T3 is T3 < T1 - 30℃.

[0015] Furthermore, when the refrigerator exits the defrosting stage, the control method further includes: The compressor is controlled to run at a first preset speed, and it is determined whether the temperature detected by the temperature sensor has reached a fourth preset temperature T4. When the determination is yes, control the compressor to switch to the second preset speed; If the determination is negative, the compressor is controlled to continue operating at the first preset speed.

[0016] Furthermore, the first preset rotational speed is greater than the second preset rotational speed.

[0017] Furthermore, the fourth preset temperature T4 has a range of -10℃ to -20℃.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: This invention uses a heating device to defrost the evaporator above, and then uses a temperature sensor located on top of the heating device to accurately detect the temperature of the heating device, thereby speeding up defrosting and shortening the heating time of the heating device. This ensures that the temperature of the freezer compartment of the frost-free refrigerator does not rise too much during the shortened heating time, allowing the freezer compartment to keep the food placed inside fresh for a short period of time. Attached Figure Description

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects and not to describe a particular order.

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the internal structure of the protective cover of the present invention; Figure 2 This is a flowchart of the defrosting stage of the present invention; Figure 3 This is a flowchart of the refrigeration stage of the present invention; Figure 4 The flowcharts for the defrosting and cooling stages of this invention are as follows. Figure 5 This is another flowchart of the defrosting stage of the present invention; Figure 6 This is another flowchart of the defrosting and cooling stages of the present invention.

[0022] Figure label: 10. Protective cover; 20. Evaporator; 30. Heating device; 40. Temperature sensor; 50. Air duct; 60. Exhaust system. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Therefore, a feature pointed out in this specification is used to illustrate one feature of one embodiment of the invention, and does not imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0024] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0025] As an example, refer to the appendix Figure 1 and attached Figure 4 The present invention proposes a defrosting system, including a protective cover 10, an evaporator 20 and a heating device 30 are provided inside the protective cover 10, the heating device 30 is located below the evaporator 20, and a temperature sensor 40 is provided on the top of the heating device 30 for detecting the temperature of the top of the heating device 30.

[0026] The temperature sensor 40 is preferably a high-temperature resistant temperature sensor, and the temperature sensor 40 is located in the middle of the top of the heating device 30.

[0027] The defrosting system also has a control center. When the compressor of the frost-free refrigerator reaches the first preset time, the defrosting system needs to be activated to defrost the refrigerator. The first preset time is preferably any time point between 12 hours and 24 hours. Of course, the first preset time can also be set to other suitable running times according to the specific operating conditions of the compressor, which is not limited here.

[0028] When the defrosting system is activated, the frost-free refrigerator enters the defrosting stage. At this time, the control center controls the heating device 30 to start and heat the evaporator 20 above the heating device 30. When the temperature sensor 40 detects that the temperature at the top of the heating device 30 is at the first preset temperature T1, the heating device 30 will continue to run at the first preset temperature T1 for a second preset time, so that the frost on the evaporator 20 melts into water and is discharged.

[0029] If the temperature sensor 40 detects that the temperature at the top of the heating device 30 is greater than the second preset temperature T2, in order to prevent the temperature in the freezer compartment of the refrigerator from getting too high, the heating device 30 will be turned off, and the remaining heat of the heating device 30 will be used to continue defrosting the evaporator 20. After a third preset time, the frost-free refrigerator will exit the defrosting stage and the compressor of the frost-free refrigerator will start running and enter the cooling stage until the frost-free refrigerator enters the defrosting stage again.

[0030] The first preset temperature T1 is preferably 200℃~350℃. Of course, the first preset temperature T1 can also be set to other suitable temperatures according to the specific operating conditions of the frost-free refrigerator, which is not limited here.

[0031] The second preset time is preferably 30 to 50 minutes. Of course, the second preset time can also be set to other suitable defrosting times according to the defrosting situation on the evaporator 20, which is not limited here.

[0032] The second preset temperature T2 is preferably T2 > T1 + 2℃. Of course, the second preset temperature T2 can also be set to other suitable temperatures according to the specific operating conditions of the frost-free refrigerator, which is not limited here.

[0033] The third preset time is preferably 5 minutes. Of course, the third preset time can also be set to other suitable times according to the defrosting situation on the evaporator 20, which is not limited here.

[0034] Therefore, the defrosting system of the present invention can accelerate defrosting and shorten the heating time of the heating device 30 in the frost-free refrigerator. By shortening the heating time, the temperature of the freezer compartment of the frost-free refrigerator can be guaranteed not to rise too much during the shortened heating time, so that the freezer compartment can still keep the food placed inside fresh for a short time.

[0035] In one embodiment, refer to Appendix Figure 1 and attached Figure 5-6 An air duct 50 is formed between the evaporator 20 and the heating device 30, and a temperature sensor 40 is provided in the air duct 50.

[0036] The protective cover 10 is provided with an exhaust device 60 corresponding to the air duct 50. The exhaust device 60 is used to blow airflow into the air duct 50.

[0037] If the temperature sensor 40 detects that the temperature at the top of the heating device 30 is at the third preset temperature T3 at the second preset time, the control center will determine that the temperature sensor 40 is covered with frost that has fallen from the evaporator 20. At this time, the control center will turn off the heating device 30 and start the exhaust device 60 to increase the airflow in the air duct 50, thereby causing the frost on the temperature sensor 40 to fall off or melt, until the temperature detected by the temperature sensor 40 is once again at the first preset temperature T1. Then the control center will turn off the exhaust device 60 and start the heating device 30 again.

[0038] If the temperature sensor 40 detects that the temperature at the top of the heating device 30 is greater than the second preset temperature T2, the heating device 30 will be turned off to prevent the temperature inside the freezer compartment from becoming too high. The remaining heat from the heating device 30 will then continue defrosting the evaporator 20 for a third preset time. After this period, the frost-free refrigerator will exit the defrosting stage, and the compressor will start running again to enter the cooling stage. This allows the temperature in the freezer compartment to drop rapidly, ensuring that the food inside remains fresh without affecting its preservation. Then, after the compressor's cumulative running time reaches the first preset time again, the frost-free refrigerator will re-enter the defrosting stage, forming a cycle.

[0039] The third preset temperature T3 is preferably T3 < T1 - 30℃. Of course, the third preset temperature T3 can also be set to other suitable temperatures according to the specific operating conditions of the frost-free refrigerator, which is not limited here.

[0040] In one embodiment, the present invention provides a refrigerator including the defrosting system described above. Of course, the refrigerator proposed in this invention includes components such as a freezer compartment and compressor, which are standard features of conventional frost-free refrigerators.

[0041] In one embodiment, refer to Appendix Figure 2 The present invention proposes a refrigerator control method as described above, comprising the following steps: Step S1: When the refrigerator is powered on and the compressor's cumulative running time reaches the first preset time, the refrigerator is controlled to enter the defrosting stage, and the heating device 30 is in operation during the defrosting stage; the first preset time is preferably 12 hours or 24 hours.

[0042] Step S2: Determine whether the temperature detected by temperature sensor 40 is within the preset temperature range.

[0043] Step S3: When the determination is yes, adjust the working state of the refrigerator so that the temperature detected by the temperature sensor 40 is maintained within the preset temperature range; when the determination is no, the working state of the refrigerator remains unchanged, and the heating device 30 continues to heat, causing the temperature to rise.

[0044] When the temperature detected by the temperature sensor 40 is maintained within the preset temperature range, the method further includes: Step S31: When the temperature detected by the temperature sensor 40 reaches the first preset temperature T1, control the heating device 30 to run for a second preset time; the second preset time is preferably 30 minutes to 50 minutes.

[0045] When controlling the heating device 30 to operate for a second preset time, the control method further includes: Determine whether the temperature detected by the temperature sensor 40 has reached the third preset temperature T3; the value range of the third preset temperature T3 is T3 < T1 - 30℃.

[0046] When the determination is yes, the heating device 30 is stopped and the exhaust device 60 is started to keep the temperature detected by the temperature sensor 40 within the preset temperature range.

[0047] If the determination is negative, the heating device 30 continues to operate.

[0048] Step S32: When the temperature detected by the temperature sensor 40 reaches the second preset temperature T2, the heating device 30 is turned off for a third preset time and the defrosting stage is exited; the third preset time is preferably 5 minutes.

[0049] Wherein, the first preset temperature T1 is the lower limit of the preset temperature range, and the value range of the first preset temperature T1 is 200℃~350℃; the second preset temperature T2 is the upper limit of the preset temperature range, and the second preset temperature T2 is greater than T1+2℃.

[0050] In one embodiment, refer to Appendix Figure 2 The defrosting method of the refrigerator of the present invention is as follows: After the compressor has accumulated 12 hours of operation, the frost-free refrigerator will enter the defrosting stage. At this time, the control center will start the heating device 30 to heat the evaporator 20 above the heating device 30. When the temperature sensor 40 detects that the temperature at the top of the heating device 30 is 300°C, the heating device 30 will continue to run at 300°C for 30 minutes to melt the frost on the evaporator 20 into water and discharge it.

[0051] If the temperature sensor 40 detects that the temperature at the top of the heating device 30 is 270°C or below within the 30 minutes, the control center will determine that the temperature sensor 40 is covered with frost that has fallen from the evaporator 20. If the heating device 30 continues to heat at this time, it will cause the freezer compartment of the frost-free refrigerator to have a safety problem due to excessive temperature. Therefore, the control center needs to turn off the heating device 30 and start the exhaust device 60 to increase the airflow in the air duct 50, thereby causing the frost on the temperature sensor 40 to fall off or melt until the temperature detected by the temperature sensor 40 is 300°C again. Then the control center will turn off the exhaust device 60 and start the heating device 30 again.

[0052] Then, when the temperature sensor 40 detects that the temperature at the top of the heating device 30 is greater than 302°C, in order to prevent the temperature in the freezer compartment of the frost-free refrigerator from getting too high, the control center will turn off the heating device 30 and use the remaining heat of the heating device 30 to continue defrosting the evaporator 20. After 5 minutes, the frost-free refrigerator will automatically exit the defrosting stage and the compressor of the frost-free refrigerator will start running and enter the cooling stage until the frost-free refrigerator enters the defrosting stage again.

[0053] This speeds up defrosting on the evaporator 20 and shortens the heating time of the heating device 30. The shortened heating time ensures that the temperature of the freezer compartment of the frost-free refrigerator does not rise too much within the shortened heating time, allowing the freezer compartment to keep the food placed inside fresh for a short period of time.

[0054] In one embodiment, refer to Appendix Figure 3 When the refrigerator exits the defrosting stage and enters the cooling stage, the control method further includes: The compressor is controlled to run at a first preset speed, and it is determined whether the temperature detected by the temperature sensor 40 has reached a fourth preset temperature T4; the value range of the fourth preset temperature T4 is -10℃ to -20℃.

[0055] When the determination is yes, control the compressor to switch to the second preset speed.

[0056] If the determination is negative, the compressor is controlled to continue operating at the first preset speed.

[0057] The first preset speed is greater than the second preset speed. Specifically, the first preset speed is the high speed of the compressor in a frost-free refrigerator, and a higher rotational speed generally means higher cooling efficiency and faster cooling speed, suitable for scenarios requiring rapid cooling or a larger cooling capacity. The second preset speed is the low speed of the compressor in a frost-free refrigerator, and a lower rotational speed generally means lower cooling efficiency and slower cooling speed, suitable for scenarios requiring less cooling capacity or higher noise levels. Furthermore, operating the compressor at a lower speed extends its lifespan.

[0058] After the frost-free refrigerator automatically exits the defrosting stage, the compressor will start cooling. To maintain the temperature of the freezer compartment and prevent it from becoming too high for an extended period, the compressor will operate at the first preset speed to lower the temperature as quickly as possible. Once the temperature sensor 40 detects that the temperature at the top of the heating element 30 is between -10℃ and -20℃, the control center will determine that the temperature inside the freezer compartment is sufficient to maintain a temperature that does not affect the preservation of food. At this point, the control center will switch the compressor to the second preset speed. This ensures the rapid cooling required after defrosting while preventing the compressor from operating at the first preset speed for an extended period, thus reducing its lifespan.

[0059] In one embodiment, refer to Appendix Figure 3 The refrigeration method of the refrigerator of the present invention is as follows: After the defrosting stage ends, the frost-free refrigerator enters the cooling stage. At this time, the compressor will turn on and start cooling. The compressor runs at the first preset speed to reduce the temperature of the freezer compartment as quickly as possible.

[0060] Once the temperature sensor 40 detects that the temperature at the top of the heating device 30 is -10℃, the control center will determine that the temperature inside the freezer compartment can be maintained at a temperature that does not affect the preservation of food in the freezer compartment. At this time, the control center will switch the compressor to the second preset speed until the cumulative running time of the compressor reaches 12 hours again, and the refrigerator will enter the defrosting stage again, forming a cycle.

[0061] Therefore, the complete control method of the refrigerator of the present invention is as follows (see appendix). Figure 6 ): After the compressor has accumulated 12 hours of operation, the frost-free refrigerator will enter the defrosting stage. At this time, the control center will start the heating device 30 to heat the evaporator 20 above the heating device 30. When the temperature sensor 40 detects that the temperature at the top of the heating device 30 is 300°C, the heating device 30 will continue to run at 300°C for 30 minutes to melt the frost on the evaporator 20 into water and discharge it.

[0062] If the temperature sensor 40 detects that the temperature at the top of the heating device 30 is 270°C or below within the 30 minutes, the control center will determine that the temperature sensor 40 is covered with frost that has fallen from the evaporator 20. If the heating device 30 continues to heat at this time, it will cause the freezer compartment of the frost-free refrigerator to have a safety problem due to excessive temperature. Therefore, the control center needs to turn off the heating device 30 and start the exhaust device 60 to increase the airflow in the air duct 50, thereby causing the frost on the temperature sensor 40 to fall off or melt until the temperature detected by the temperature sensor 40 is 300°C again. Then the control center will turn off the exhaust device 60 and start the heating device 30 again.

[0063] Then, when the temperature sensor 40 detects that the temperature at the top of the heating device 30 is greater than 302°C, in order to prevent the temperature in the freezer compartment of the frost-free refrigerator from getting too high, the control center will turn off the heating device 30 and use the remaining heat of the heating device 30 to continue defrosting the evaporator 20. After 5 minutes, the frost-free refrigerator will automatically exit the defrosting stage and allow the compressor of the frost-free refrigerator to start running and enter the cooling stage.

[0064] The compressor starts and runs at the first preset speed to lower the temperature of the freezer compartment as quickly as possible. Once the temperature sensor 40 detects that the temperature at the top of the heating device 30 is -10℃, the control center determines that the temperature inside the freezer compartment can be maintained at a temperature that does not affect the preservation of food. At this time, the control center will switch the compressor to the second preset speed. This ensures that the frost-free refrigerator can quickly cool down after defrosting to preserve food, while also preventing the compressor from running at the first preset speed for a long time, thus shortening its lifespan.

[0065] Then, after the compressor's running time accumulates to 12 hours, the frost-free refrigerator will enter the defrosting stage again, forming a cycle.

[0066] In other embodiments, the complete control method of the refrigerator of the present invention is as follows: After the compressor has accumulated 24 hours of operation, the frost-free refrigerator will enter the defrosting stage. At this time, the control center will start the heating device 30 to heat the evaporator 20 above the heating device 30. When the temperature sensor 40 detects that the temperature at the top of the heating device 30 is 350°C, the heating device 30 will continue to run at 350°C for 50 minutes to melt the frost on the evaporator 20 into water and drain it.

[0067] If the temperature sensor 40 detects that the temperature at the top of the heating device 30 is 320°C or below within the 50 minutes, the control center will determine that the temperature sensor 40 is covered with frost that has fallen from the evaporator 20. If the heating device 30 continues to heat at this time, it will cause the freezer compartment of the frost-free refrigerator to have a safety problem due to excessive temperature. Therefore, the control center needs to turn off the heating device 30 and start the exhaust device 60 to increase the airflow in the air duct 50, thereby causing the frost on the temperature sensor 40 to fall off or melt until the temperature detected by the temperature sensor 40 is 350°C again. Then the control center will turn off the exhaust device 60 and start the heating device 30 again.

[0068] Then, when the temperature sensor 40 detects that the temperature at the top of the heating device 30 is greater than 352°C, in order to prevent the temperature in the freezer compartment of the frost-free refrigerator from getting too high, the control center will turn off the heating device 30 and use the remaining heat of the heating device 30 to continue defrosting the evaporator 20. After 5 minutes, the frost-free refrigerator will automatically exit the defrosting stage and allow the compressor of the frost-free refrigerator to start running and enter the cooling stage.

[0069] The compressor starts and runs at the first preset speed to lower the temperature of the freezer compartment as quickly as possible. Once the temperature sensor 40 detects that the temperature at the top of the heating device 30 is -20°C, the control center determines that the temperature inside the freezer compartment can be maintained at a level that does not affect the preservation of food. At this point, the control center will switch the compressor to the second preset speed. This ensures that the frost-free refrigerator can quickly cool down after defrosting to preserve food, while also preventing the compressor from running at the first preset speed for an extended period, thus reducing its lifespan.

[0070] Then, after the compressor's running time accumulates to 24 hours, the frost-free refrigerator will enter the defrosting stage again, forming a cycle.

[0071] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A method for controlling a refrigerator, characterized in that, The refrigerator includes a protective cover (10), an evaporator (20) and a heating device (30) are provided inside the protective cover (10), an air duct (50) is formed between the evaporator (20) and the heating device (30), a temperature sensor (40) is provided inside the air duct (50), and the temperature sensor (40) is used to detect the temperature at the top of the heating device (30); the protective cover (10) is provided with an exhaust device (60) corresponding to the air duct (50). The control method includes: When the refrigerator is powered on and the compressor's cumulative running time reaches the first preset time, the refrigerator is controlled to enter the defrosting stage, and during the defrosting stage, the heating device (30) is in operation. Determine whether the temperature detected by the temperature sensor (40) has reached the first preset temperature T1; When the determination is yes, the heating device (30) is controlled to run for a second preset time, and then the temperature range detected by the temperature sensor (40) is determined. If the second preset temperature T2 is reached, the heating device (30) is turned off and kept off for a third preset time. After the third preset time is over, the defrosting stage is exited. If the third preset temperature T3 is reached, the heating device (30) is turned off and the exhaust device (60) is started so that the temperature detected by the temperature sensor (40) is within the preset temperature range; Wherein, the first preset temperature T1 is the lower limit of the preset temperature range, the second preset temperature T2 is the upper limit of the preset temperature range, and the value range of the third preset temperature T3 is T3 < T1 - 30℃.

2. The control method according to claim 1, characterized in that, The first preset temperature T1 ranges from 200℃ to 350℃.

3. The control method according to claim 1 or 2, characterized in that, The second preset temperature T2 has a range of T2 > T1 + 2℃.

4. The control method according to claim 1, characterized in that, When the refrigerator exits the defrosting stage, the control method further includes: Control the compressor to run at a first preset speed, and determine whether the temperature detected by the temperature sensor (40) has reached the fourth preset temperature T4; When the determination is yes, control the compressor to switch to the second preset speed; If the determination is negative, the compressor is controlled to continue operating at the first preset speed.

5. The control method according to claim 4, characterized in that, The first preset speed is greater than the second preset speed.

6. The control method according to claim 4, characterized in that, The fourth preset temperature T4 has a range of -10℃ to -20℃.

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