CN114234520B - Refrigerator and defrosting control method thereof - Google Patents

Refrigerator and defrosting control method thereof Download PDF

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Publication number
CN114234520B
CN114234520B CN202111568463.4A CN202111568463A CN114234520B CN 114234520 B CN114234520 B CN 114234520B CN 202111568463 A CN202111568463 A CN 202111568463A CN 114234520 B CN114234520 B CN 114234520B
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China
Prior art keywords
fan
defrosting
evaporator
input voltage
refrigerator
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CN202111568463.4A
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CN114234520A (en
Inventor
董安琪
马科帅
王绚
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Hisense Refrigerator Co Ltd
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Hisense Refrigerator Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/08—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation using ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/36—Visual displays

Abstract

The invention discloses a refrigerator and a defrosting control method thereof, wherein the correlation between the frosting of the surface of an evaporator and the first input voltage of a first fan can be utilized to establish the corresponding relation between the frosting quantity of the evaporator and the first input voltage of the fan under a specific rotating speed. When the first fan actually operates, the frost amount of the evaporator is indirectly judged by detecting the stable operation voltage of the first fan, and defrosting is timely started. The defrosting device can accurately identify the frosting degree of the evaporator, the defrosting heating pipe is started at a better time to defrost the evaporator, energy waste caused by premature defrosting is avoided, deterioration of the refrigeration performance of the refrigerator caused by untimely defrosting is avoided, and defrosting according to needs is realized in the actual use process.

Description

Refrigerator and defrosting control method thereof
Technical Field
The invention relates to the technical field of refrigerator control, in particular to a refrigerator and a defrosting control method thereof.
Background
The defrosting energy consumption accounts for 10% -20% of the running energy consumption of the air-cooled refrigerator, and the energy efficiency index of the whole refrigerator can be remarkably improved by optimizing the defrosting control of the refrigerator. At present, a common defrosting judgment condition for refrigerator products is to accumulate running time by using a whole machine or a compressor, which is also called a variable defrosting period control method. Namely: a shortest defrosting time tmi n, a longest defrosting time tmax are set. In detail, the defrosting intervals of different environment temperature/humidity, setting gear and opening and closing door time are respectively set according to experience, after the defrosting time set by a program is reached, a defrosting heater is started to defrost, after judging that the defrosting layer is completely melted, the defrosting heater stops, and refrigeration is recovered, and the cycle is repeated.
The defrosting method using time as a control parameter can not accurately capture the actual frosting quantity of the surface of the evaporator under different working conditions, and has the problems of premature defrosting, untimely defrosting and the like. For example, when a user actually uses the evaporator, the high-water-content food is put in or the door is frequently opened and closed to accelerate the frosting of the evaporator, and when the frosting time interval set by a program is not reached, the frost layer on the surface of the evaporator is excessively accumulated and influences normal heat exchange, so that the refrigerating efficiency is reduced; when a user does not put food or does not open the door for a long time, less frost is formed on the evaporator, the heat exchange performance is not obviously reduced when the defrosting time interval meets the program setting, and the problems that the refrigerator energy consumption is increased due to premature defrosting, the quality of food is affected due to frequent defrosting temperature rise and the like are solved.
Disclosure of Invention
The embodiment of the invention aims to provide a refrigerator and a defrosting control method thereof, which can accurately identify the frosting degree of an evaporator, start a defrosting heating pipe to defrost the evaporator at a better moment, avoid energy waste caused by premature defrosting, avoid deterioration of the refrigeration performance of the refrigerator caused by untimely defrosting, and realize defrosting according to needs in the actual use process.
To achieve the above object, an embodiment of the present invention provides a refrigerator including:
the cold air circulation system comprises an evaporator and a first fan, the evaporator is arranged between the air duct of the box body and the inner container, the first fan is positioned at the upper part of the evaporator, and the first fan transfers the cold energy of the evaporator into the room through air circulation;
the controller is configured to:
when the first fan is detected to enter a stable running state, acquiring a first input voltage of the first fan;
when the first input voltage is smaller than a preset first voltage threshold value, defrosting operation is executed after the refrigerator is stopped;
acquiring a defrosting temperature of the evaporator in the process of executing the defrosting operation;
and stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
As an improvement of the above, the controller is further configured to:
inputting a preset starting voltage to start the first fan, and detecting the real-time rotating speed of the first fan;
adjusting the starting voltage to adjust the real-time rotation speed;
and when the real-time rotating speed is equal to the preset rated rotating speed, judging that the first fan is in a stable running state.
As an improvement of the above, the refrigerator further includes:
the heat dissipation system comprises a condenser and a second fan, wherein the second fan is arranged on one side of the condenser;
the controller is further configured to:
when the second fan is detected to enter a stable running state, acquiring a second input voltage of the second fan;
and when the second input voltage is smaller than a preset second voltage threshold value, sending out prompt information for cleaning the condenser.
As an improvement of the above solution, the first voltage threshold satisfies the following formula:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage acquired after the first fan runs stably after no frost is formed on the surface of the evaporator or after single defrosting is finished; Δu is the difference between the input voltages of the first fan when the evaporator is in the frost-free state and the frost-free state; η is the frost coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; and UX is the input voltage UX of the first fan corresponding to the turning point of the power consumption change in the power consumption of the refrigeration cycle.
In order to achieve the above object, an embodiment of the present invention further provides a method for controlling defrosting of a refrigerator, including:
when a first fan in a refrigerator is detected to enter a stable running state, acquiring a first input voltage of the first fan; wherein the first fan is arranged at the upper part of an evaporator in the refrigerator;
when the first input voltage is smaller than a preset first voltage threshold value, defrosting operation is executed after the refrigerator is stopped;
acquiring a defrosting temperature of the evaporator in the process of executing the defrosting operation;
and stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
As an improvement of the above solution, the method further includes:
inputting a preset starting voltage to start the first fan, and detecting the real-time rotating speed of the first fan;
adjusting the starting voltage to adjust the real-time rotation speed;
when the real-time rotating speed is equal to a preset rated rotating speed, judging that the first fan is in a stable running state
As an improvement of the above solution, the method further includes:
when the second fan is detected to enter a stable running state, acquiring a second input voltage of the second fan; wherein the second fan is arranged at one side of a condenser in the refrigerator;
and when the second input voltage is smaller than a preset second voltage threshold value, sending out prompt information for cleaning the condenser.
As an improvement of the above solution, the first voltage threshold satisfies the following formula:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage acquired after the first fan runs stably after no frost is formed on the surface of the evaporator or after single defrosting is finished; Δu is the difference between the input voltages of the first fan when the evaporator is in the frost-free state and the frost-free state; η is the frost coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; and UX is the input voltage UX of the first fan corresponding to the turning point of the power consumption change in the power consumption of the refrigeration cycle.
Compared with the prior art, the refrigerator and the defrosting control method thereof disclosed by the invention can establish the corresponding relation between the frosting quantity of the evaporator and the first input voltage of the first fan under a specific rotating speed by utilizing the correlation between the frosting of the surface of the evaporator and the first input voltage of the first fan. When the first fan actually operates, the frost amount of the evaporator is indirectly judged by detecting the stable operation voltage of the first fan, and defrosting is timely started. The defrosting device can accurately identify the frosting degree of the evaporator, the defrosting heating pipe is started at a better time to defrost the evaporator, energy waste caused by premature defrosting is avoided, deterioration of the refrigeration performance of the refrigerator caused by untimely defrosting is avoided, and defrosting according to needs is realized in the actual use process. In addition, by utilizing the correlation between the input voltage of the second fan and the dust accumulation amount of the condenser, the corresponding relation between the dust accumulation amount of the condenser and the second input voltage can be established at a specific rotating speed, and a user can be reminded of cleaning the condenser in time.
Drawings
Fig. 1 is a schematic view of a refrigerator according to an embodiment of the present invention;
fig. 2 is another schematic structural view of a refrigerator according to an embodiment of the present invention;
FIG. 3 is a flow chart of the operation of the controller provided by an embodiment of the present invention;
fig. 4 is a flowchart of a method for controlling defrosting of a refrigerator according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural view of a refrigerator according to an embodiment of the present invention, the refrigerator includes:
the cold air circulation system 10 comprises an evaporator and a first fan, wherein the evaporator is arranged between the air duct of the box body and the inner container, the first fan is positioned at the upper part of the evaporator, and the first fan transfers the cold energy of the evaporator into the room through air circulation;
the controller 20 is configured to:
when the first fan is detected to enter a stable running state, acquiring a first input voltage of the first fan;
when the first input voltage is smaller than a preset first voltage threshold value, defrosting operation is executed after the refrigerator is stopped;
acquiring a defrosting temperature of the evaporator in the process of executing the defrosting operation;
and stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
The conventional air-cooled refrigerator mainly comprises a refrigerating system consisting of a compressor, a condenser, a capillary tube and an evaporator, a cold air circulating system consisting of the evaporator, a first fan, an air duct and a compartment, a compressor bin heat dissipation system consisting of the condenser, a second fan and the compressor, and a control system. The evaporator is arranged between the box body air channel and the liner, the first fan is positioned at the upper part of the evaporator, and when the first fan operates, the cooling capacity of the evaporator is transferred into the compartment through air circulation, so that the refrigerating and cooling process is realized. In addition, a defrosting heating pipe is arranged at the bottom of the evaporator, and when a defrosting instruction is received, the defrosting heating pipe is electrified to generate heat so as to melt the frost condensed on the evaporator. The condenser is located the upper reaches of second fan, the compressor is located the low reaches of second fan, be equipped with the louvre behind the compressor cover, be convenient for the circulation of air, when the second fan was operated, the pressure differential around the second fan drove box air to get into the compressor storehouse through the louvre on right side, through end condenser, second fan, compressor in proper order, finally discharges through the louvre on left side, and in this process, the circulation air takes away the heat of condenser and compressor.
Referring to fig. 2, the refrigerator further includes a signal acquisition module 40, a defrosting module 50, a fan driving module 60, and a display module 70. The fan driving module 60 is connected with the controller 20 through a connecting wire and is divided into a motor driving circuit 61 and a rotating speed detecting circuit 62, the motor driving circuit 61 receives a driving signal output by the controller 20, and the driving motor drives the fan blades to rotate; the rotation speed detecting circuit 62 is composed of hall elements, and is configured to detect the actual rotation speeds of the first fan and the second fan, and transmit the actual rotation speeds to the controller 20 after receiving the actual rotation speeds via the signal collecting module 40. The defrosting module 50 comprises a defrosting heating circuit 51 and an evaporator temperature sensor 52, the controller 20 controls the on-off state of the defrosting heating circuit 51, and the evaporator temperature sensor 52 feeds back signals to the signal acquisition module 40. In addition, the signal acquisition module 40 reads the first input voltage and the second input voltage of the motor, and transmits them to the controller 20. The display module 70 is configured to display a prompt message, for example, the prompt message is a message prompting a user to clean the condenser.
Optionally, the controller 20 is further configured to:
inputting a preset starting voltage to start the first fan, and detecting the real-time rotating speed of the first fan;
adjusting the starting voltage to adjust the real-time rotation speed;
and when the real-time rotating speed is equal to the preset rated rotating speed, judging that the first fan is in a stable running state.
Referring to fig. 3, fig. 3 illustrates a working process of the controller 20, the first fan is operated at a starting voltage U preset by a program, and a real-time rotation speed f of the first fan is detected. And when the real-time rotating speed f is higher than the rated rotating speed f0, the starting voltage U is reduced, and when the real-time rotating speed f is lower than the rated rotating speed f0, the starting voltage U is increased, and finally the rotating speed of the first fan reaches f0 to stably run. After the first fan stably operates, detecting a first input voltage U of the first fan, and comparing the first input voltage U with a preset first voltage threshold value Uh. If U is less than Uh, defrosting operation is executed, otherwise, operation is continued; and when defrosting is carried out, acquiring the defrosting temperature Th of the evaporator in real time, and stopping defrosting when the defrosting temperature Th reaches the preset defrosting exit temperature Tend.
Optionally, the first voltage threshold satisfies the following formula:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage acquired after the first fan runs stably after no frost is formed on the surface of the evaporator or after single defrosting is finished; Δu is the difference between the input voltages of the first fan when the evaporator is in the frost-free state and the frost-free state; η is the frost coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; and UX is the input voltage UX of the first fan corresponding to the turning point of the power consumption change in the power consumption of the refrigeration cycle.
Illustratively, in order to further improve defrosting efficiency, an automatic correction method of the preset defrosting voltage Uh is added. The method is based on the actual running state of the fan to judge the frosting quantity, and can avoid the judgment errors of frosting quantity caused by different food storage quantity and food stacking modes of users, channel assembly in mass production, motor parameters and fluctuation of hardware parameters of a controller, thereby improving the judgment accuracy.
When the surface of the evaporator is not frosted or after the single defrosting is finished, the controller starts the first fan to run stably, and then the first input voltage U0 is acquired. And then, when the first fan stably operates in each refrigeration cycle, collecting the first input voltage U of the first fan, and comparing U with U0-eta delta U. When U < U0-DeltaU, defrosting is performed. ΔU and η are determined by prototype test. For example, when the refrigerator starts to operate, the evaporator is ensured to be free of frosting, and when the first fan operates stably in each refrigeration cycle, the first input voltage of the first fan is collected until the evaporator is full of frosting, the recorded first input voltages are [ U0, U1,..UN ] in sequence, and meanwhile, the power consumption of each refrigeration cycle is calculated. The power consumption necessarily shows a change trend of firstly constant and then slowly increasing. And finding the fan first input voltage UX corresponding to the power consumption change turning point, and then eta= (U0-UX)/(U0-UN).
Still further, the refrigerator further includes:
the heat dissipation system 30 comprises a condenser and a second fan, wherein the second fan is arranged on one side of the condenser;
the controller 20 is further configured to:
when the second fan is detected to enter a stable running state, acquiring a second input voltage of the second fan;
and when the second input voltage is smaller than a preset second voltage threshold value, sending out prompt information for cleaning the condenser.
For example, when dust is accumulated in the condenser, the air flow area and the air flow rate in the compressor bin are reduced, and the operation load and the input and output electric signals of the second fan are correspondingly changed. For example, when the condenser surface is covered with dust flock, the air circulation flow rate is reduced, and the second input voltage (power) of the second fan is reduced at the same rotation speed. By utilizing the characteristic, the corresponding relation between the dust collection amount of the condenser and the second input voltage of the fan can be established at a specific rotating speed. Through detecting fan steady operation voltage, judge the condenser laying dust degree indirectly, remind the user in time remove dust. The second voltage threshold may be measured via a laboratory. When the second fan operates, the second input voltage U of the second fan is detected in real time, and the second input voltage U is compared with a preset second voltage threshold Ub. If U is less than Ub, a reminding instruction is sent to the display panel, otherwise, the operation is continued.
Compared with the prior art, the refrigerator disclosed by the embodiment of the invention can establish the corresponding relation between the frosting quantity of the evaporator and the first input voltage of the first fan by utilizing the correlation between the frosting of the surface of the evaporator and the first input voltage of the first fan at a specific rotating speed. When the first fan actually operates, the frost amount of the evaporator is indirectly judged by detecting the stable operation voltage of the first fan, and defrosting is timely started. The defrosting device can accurately identify the frosting degree of the evaporator, the defrosting heating pipe is started at a better time to defrost the evaporator, energy waste caused by premature defrosting is avoided, deterioration of the refrigeration performance of the refrigerator caused by untimely defrosting is avoided, and defrosting according to needs is realized in the actual use process. In addition, by utilizing the correlation between the input voltage of the second fan and the dust accumulation amount of the condenser, the corresponding relation between the dust accumulation amount of the condenser and the second input voltage can be established at a specific rotating speed, and a user can be reminded of cleaning the condenser in time.
Referring to fig. 4, fig. 4 is a flowchart of a method for controlling defrosting of a refrigerator according to an embodiment of the present invention, where the method for controlling defrosting of a refrigerator includes:
s1, when a first fan in a refrigerator is detected to enter a stable running state, acquiring a first input voltage of the first fan;
s2, when the first input voltage is smaller than a preset first voltage threshold value, defrosting operation is executed after the refrigerator is stopped;
s3, acquiring defrosting temperature of the evaporator in the defrosting operation executing process;
and S4, stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
The conventional air-cooled refrigerator mainly comprises a refrigerating system consisting of a compressor, a condenser, a capillary tube and an evaporator, a cold air circulating system consisting of the evaporator, a first fan, an air duct and a compartment, a compressor bin heat dissipation system consisting of the condenser, a second fan and the compressor, and a control system. The evaporator is arranged between the box body air channel and the liner, the first fan is positioned at the upper part of the evaporator, and when the first fan operates, the cooling capacity of the evaporator is transferred into the compartment through air circulation, so that the refrigerating and cooling process is realized. In addition, a defrosting heating pipe is arranged at the bottom of the evaporator, and when a defrosting instruction is received, the defrosting heating pipe is electrified to generate heat so as to melt the frost condensed on the evaporator. The condenser is located the upper reaches of second fan, the compressor is located the low reaches of second fan, be equipped with the louvre behind the compressor cover, be convenient for the circulation of air, when the second fan was operated, the pressure differential around the second fan drove box air to get into the compressor storehouse through the louvre on right side, through end condenser, second fan, compressor in proper order, finally discharges through the louvre on left side, and in this process, the circulation air takes away the heat of condenser and compressor.
Optionally, the refrigerator defrosting control method further comprises the following steps:
inputting a preset starting voltage to start the first fan, and detecting the real-time rotating speed of the first fan;
adjusting the starting voltage to adjust the real-time rotation speed;
and when the real-time rotating speed is equal to the preset rated rotating speed, judging that the first fan is in a stable running state.
The first fan operates at a starting voltage U preset by a program, and detects a real-time rotation speed f of the first fan. And when the real-time rotating speed f is higher than the rated rotating speed f0, the starting voltage U is reduced, and when the real-time rotating speed f is lower than the rated rotating speed f0, the starting voltage U is increased, and finally the rotating speed of the first fan reaches f0 to stably run. After the first fan stably operates, detecting a first input voltage U of the first fan, and comparing the first input voltage U with a preset first voltage threshold value Uh. If U is less than Uh, defrosting operation is executed, otherwise, operation is continued; and when defrosting is carried out, acquiring the defrosting temperature Th of the evaporator in real time, and stopping defrosting when the defrosting temperature Th reaches the preset defrosting exit temperature Tend.
Optionally, the first voltage threshold satisfies the following formula:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage acquired after the first fan runs stably after no frost is formed on the surface of the evaporator or after single defrosting is finished; Δu is the difference between the input voltages of the first fan when the evaporator is in the frost-free state and the frost-free state; η is the frost coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; and UX is the input voltage UX of the first fan corresponding to the turning point of the power consumption change in the power consumption of the refrigeration cycle.
Illustratively, in order to further improve defrosting efficiency, an automatic correction method of the preset defrosting voltage Uh is added. The method is based on the actual running state of the fan to judge the frosting quantity, and can avoid the judgment errors of frosting quantity caused by different food storage quantity and food stacking modes of users, channel assembly in mass production, motor parameters and fluctuation of hardware parameters of a controller, thereby improving the judgment accuracy.
When the surface of the evaporator is not frosted or after the single defrosting is finished, the controller starts the first fan to run stably, and then the first input voltage U0 is acquired. And then, when the first fan stably operates in each refrigeration cycle, collecting the first input voltage U of the first fan, and comparing U with U0-eta delta U. When U < U0-DeltaU, defrosting is performed. ΔU and η are determined by prototype test. For example, when the refrigerator starts to operate, the evaporator is ensured to be free of frosting, and when the first fan operates stably in each refrigeration cycle, the first input voltage of the first fan is collected until the evaporator is full of frosting, the recorded first input voltages are [ U0, U1,..UN ] in sequence, and meanwhile power consumption of each refrigeration cycle is calculated. The power consumption necessarily shows a change trend of firstly constant and then slowly increasing. Finding the first input voltage UX corresponding to the turning point of the power consumption change, η= (U0-UX)/(U0-UN).
Still further, the refrigerator defrosting control method further includes:
when the second fan is detected to enter a stable running state, acquiring a second input voltage of the second fan;
and when the second input voltage is smaller than a preset second voltage threshold value, sending out prompt information of cleaning the condenser.
For example, when dust is accumulated in the condenser, the air flow area and the air flow rate in the compressor bin are reduced, and the operation load and the input and output electric signals of the second fan are correspondingly changed. For example, when the condenser surface is covered with dust flock, the air circulation flow rate is reduced, and the second input voltage (power) of the second fan is reduced at the same rotation speed. By utilizing the characteristic, the corresponding relation between the dust collection amount of the condenser and the second input voltage of the second fan can be established at a specific rotating speed. Through detecting fan steady operation voltage, judge the condenser laying dust degree indirectly, remind the user in time remove dust. The second voltage threshold may be measured via a laboratory. When the fan operates, the second input voltage U 'of the fan is detected in real time, and the second input voltage U' is compared with a preset second voltage threshold Ub. If U' < Ub, sending a reminding instruction to the display panel, otherwise, continuing to operate.
Compared with the prior art, the refrigerator defrosting control method disclosed by the embodiment of the invention can establish the corresponding relation between the frosting quantity of the evaporator and the first input voltage of the first fan under a specific rotating speed by utilizing the correlation between the frosting of the surface of the evaporator and the first input voltage of the first fan. When the first fan actually operates, the frost amount of the evaporator is indirectly judged by detecting the stable operation voltage of the first fan, and defrosting is timely started. The defrosting device can accurately identify the frosting degree of the evaporator, the defrosting heating pipe is started at a better time to defrost the evaporator, energy waste caused by premature defrosting is avoided, deterioration of the refrigeration performance of the refrigerator caused by untimely defrosting is avoided, and defrosting according to needs is realized in the actual use process. In addition, by utilizing the correlation between the input voltage of the second fan and the dust accumulation amount of the condenser, the corresponding relation between the dust accumulation amount of the condenser and the second input voltage can be established at a specific rotating speed, and a user can be reminded of cleaning the condenser in time.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims (4)

1. A refrigerator, comprising:
the cold air circulation system comprises an evaporator and a first fan, the evaporator is arranged between the air duct of the box body and the inner container, the first fan is positioned at the upper part of the evaporator, and the first fan transfers the cold energy of the evaporator into the room through air circulation;
the defrosting heating pipe is arranged at the bottom of the evaporator and is electrified to heat so as to melt the frost condensed on the evaporator;
the controller is configured to:
when the first fan is detected to enter a stable running state, acquiring a first input voltage of the first fan;
when the first input voltage is smaller than a preset first voltage threshold value, defrosting operation is executed after the refrigerator is stopped;
acquiring a defrosting temperature of the evaporator in the process of executing the defrosting operation;
stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature;
the controller is further configured to:
inputting a preset starting voltage to start the first fan, and detecting the real-time rotating speed of the first fan;
adjusting the starting voltage to adjust the real-time rotation speed;
when the real-time rotating speed is equal to a preset rated rotating speed, judging that the first fan is in a stable running state;
the first voltage threshold satisfies the following formula:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage acquired after the first fan runs stably after no frost is formed on the surface of the evaporator or after single defrosting is finished; Δu is the difference between the input voltages of the first fan when the evaporator is in the frost-free state and the frost-free state; η is the frost coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; and UX is the input voltage UX of the first fan corresponding to the turning point of the power consumption change in the power consumption of the refrigeration cycle.
2. The refrigerator of claim 1, further comprising:
the heat dissipation system comprises a condenser and a second fan, wherein the second fan is arranged on one side of the condenser;
the controller is further configured to:
when the second fan is detected to enter a stable running state, acquiring a second input voltage of the second fan;
and when the second input voltage is smaller than a preset second voltage threshold value, sending out prompt information for cleaning the condenser.
3. A defrosting control method for a refrigerator, comprising:
when a first fan in a refrigerator is detected to enter a stable running state, acquiring a first input voltage of the first fan; wherein the first fan is arranged at the upper part of an evaporator in the refrigerator;
when the first input voltage is smaller than a preset first voltage threshold value, defrosting operation is executed after the refrigerator is stopped;
acquiring a defrosting temperature of the evaporator in the process of executing the defrosting operation;
stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature;
the method further comprises the steps of:
inputting a preset starting voltage to start the first fan, and detecting the real-time rotating speed of the first fan;
adjusting the starting voltage to adjust the real-time rotation speed;
when the real-time rotating speed is equal to a preset rated rotating speed, judging that the first fan is in a stable running state;
the first voltage threshold satisfies the following formula:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage acquired after the first fan runs stably after no frost is formed on the surface of the evaporator or after single defrosting is finished; Δu is the difference between the input voltages of the first fan when the evaporator is in the frost-free state and the frost-free state; η is the frost coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; and UX is the input voltage UX of the first fan corresponding to the turning point of the power consumption change in the power consumption of the refrigeration cycle.
4. The refrigerator defrosting control method of claim 3, wherein the method further comprises:
when the second fan is detected to enter a stable running state, acquiring a second input voltage of the second fan; wherein the second fan is arranged at one side of a condenser in the refrigerator;
and when the second input voltage is smaller than a preset second voltage threshold value, sending out prompt information for cleaning the condenser.
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