CN114234520A - Refrigerator and defrosting control method thereof - Google Patents
Refrigerator and defrosting control method thereof Download PDFInfo
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- CN114234520A CN114234520A CN202111568463.4A CN202111568463A CN114234520A CN 114234520 A CN114234520 A CN 114234520A CN 202111568463 A CN202111568463 A CN 202111568463A CN 114234520 A CN114234520 A CN 114234520A
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- 238000010257 thawing Methods 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 238000004140 cleaning Methods 0.000 claims description 9
- 230000017525 heat dissipation Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000000428 dust Substances 0.000 description 14
- 238000009825 accumulation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000002028 premature Effects 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 238000011545 laboratory measurement Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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- 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
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a refrigerator and a defrosting control method thereof, which can establish the corresponding relation between the frosting amount of an evaporator and the first input voltage of a fan at a specific rotating speed by utilizing the correlation between the frosting amount on 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 started in due time. Can accurately discern the evaporimeter degree of frosting, open the defrosting heating pipe at better moment and change the frost to the evaporimeter, avoid too early defrosting to cause the energy extravagant, also avoid changing the frost untimely refrigerator refrigeration performance that leads to worsen, realize changing the frost as required in the in-service use process.
Description
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 operation 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, the defrosting judgment condition commonly adopted by refrigerator products is the accumulated running time of a complete machine or a compressor, and the defrosting judgment condition is also called as a variable defrosting period control method. Namely: a shortest defrosting time tmin and a longest defrosting time tmax are set. In detail, defrosting intervals of different environment temperatures/humidities, set gears and door opening and closing time are respectively set according to experience, a defrosting heater is started to defrost when the defrosting time set by a program is reached, and the defrosting heater is stopped after frost is judged to be completely frosted, refrigeration is resumed, and the process is repeated.
The defrosting method using time as a control parameter cannot accurately capture the actual frosting amount 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, frost formation of the evaporator can be accelerated by putting high-water-content food or frequently opening and closing the door, and when the defrosting time interval set by a program is not reached, frost layers on the surface of the evaporator are excessively accumulated to influence normal heat exchange, so that the refrigerating efficiency is reduced; when a user does not put food or open the door for a long time, the evaporator frosts less, the heat exchange performance is not obviously reduced when the defrosting time interval meets the program setting, and the problems that the energy consumption of the refrigerator is increased due to premature defrosting, the food quality is influenced by frequent defrosting and temperature rise and the like are caused.
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, open a defrosting heating pipe to defrost the evaporator at a better time, avoid energy waste caused by premature defrosting, avoid the refrigeration performance deterioration of the refrigerator caused by untimely defrosting, and realize defrosting as required in the actual use process.
To achieve the above object, an embodiment of the present invention provides a refrigerator, including:
the cold air circulating system comprises an evaporator and a first fan, the evaporator is arranged between the box body air duct 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 compartment through air circulation;
the controller is configured to:
when the first fan is detected to enter a stable operation state, acquiring a first input voltage of the first fan;
when the first input voltage is smaller than a preset first voltage threshold value, executing defrosting operation after the refrigerator is shut down;
acquiring the defrosting temperature of the evaporator in the defrosting operation process;
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 a 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, and 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 operation 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 prompt information for cleaning the condenser.
As a refinement of the above, the first voltage threshold satisfies the following equation:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage collected after the surface of the evaporator is not frosted or single defrosting is finished and the first fan operates stably; delta U is the difference of the input voltage of the first fan when the evaporator is in a frost-free state and a complete frost state; eta is the frosting coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; UX is the input voltage UX of the first fan corresponding to the power consumption change turning point in the power consumption of the refrigeration cycle.
In order to achieve the above object, an embodiment of the present invention further provides a refrigerator defrosting control method, including:
when a first fan in a refrigerator is detected to enter a stable operation state, acquiring a first input voltage of the first fan; the first fan is arranged at the upper part of the evaporator in the refrigerator;
when the first input voltage is smaller than a preset first voltage threshold value, executing defrosting operation after the refrigerator is shut down;
acquiring the defrosting temperature of the evaporator in the defrosting operation process;
and stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
As an improvement of the above, the method further comprises:
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 the preset rated rotating speed, the first fan is judged to be in a stable running state
As an improvement of the above, the method further comprises:
when the second fan is detected to enter a stable operation state, acquiring a second input voltage of the second fan; the second fan is arranged on one side of the condenser in the refrigerator;
and when the second input voltage is smaller than a preset second voltage threshold value, sending prompt information for cleaning the condenser.
As a refinement of the above, the first voltage threshold satisfies the following equation:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage collected after the surface of the evaporator is not frosted or single defrosting is finished and the first fan operates stably; delta U is the difference of the input voltage of the first fan when the evaporator is in a frost-free state and a complete frost state; eta is the frosting coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; UX is the input voltage UX of the first fan corresponding to the power consumption change turning point 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 amount of the evaporator and the first input voltage of the first fan under a specific rotating speed by utilizing the correlation between the frosting amount on 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 started in due time. Can accurately discern the evaporimeter degree of frosting, open the defrosting heating pipe at better moment and change the frost to the evaporimeter, avoid too early defrosting to cause the energy extravagant, also avoid changing the frost untimely refrigerator refrigeration performance that leads to worsen, realize changing the frost as required in the in-service 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 structural diagram of a refrigerator according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a refrigerator according to an embodiment of the present invention;
FIG. 3 is a flow chart of the operation of a controller provided by an embodiment of the present invention;
fig. 4 is a flowchart of a refrigerator defrosting control method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a refrigerator provided in an embodiment of the present invention, where the refrigerator includes:
the cold air circulating system 10 comprises an evaporator and a first fan, the evaporator is arranged between the box body air duct 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 compartment through air circulation;
the controller 20 is configured to:
when the first fan is detected to enter a stable operation state, acquiring a first input voltage of the first fan;
when the first input voltage is smaller than a preset first voltage threshold value, executing defrosting operation after the refrigerator is shut down;
acquiring the defrosting temperature of the evaporator in the defrosting operation process;
and stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
For example, the conventional air-cooled refrigerator mainly includes a refrigeration system including a compressor, a condenser, a capillary tube, and an evaporator, a cold air circulation system including an evaporator, a first fan, an air duct, and a compartment, a compressor compartment heat dissipation system including a condenser, a second fan, and a compressor, and a control system. The evaporator is arranged between the box body air duct and the inner container, the first fan is located on the upper portion of the evaporator, and when the first fan operates, the cold quantity of the evaporator is transferred into the compartment through air circulation, so that the refrigerating and cooling processes are achieved. In addition, the bottom of the evaporator is provided with a defrosting heating pipe, and when a defrosting command is received, the defrosting heating pipe is electrified to generate heat 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, cover behind the compressor and be equipped with the louvre, the circulation of air of being convenient for, when the second fan operates, pressure differential around the second fan orders about the box around the air gets into the compressor storehouse through the louvre on right side, through end condenser, second fan, compressor in proper order, discharges through left louvre at last, and at this in-process, the circulation air takes away the heat of condenser and compressor.
Referring to fig. 2, the refrigerator further includes a signal collection 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 detection circuit 62, the motor driving circuit 61 receives a driving signal output by the controller 20, and a driving motor drives a fan blade to rotate; the rotation speed detection circuit 62 is composed of hall elements, and is configured to detect actual rotation speeds of the first fan and the second fan, and transmit the actual rotation speeds to the controller 20 after being received by the signal acquisition 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 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 the first input voltage and the second input voltage 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 a preset rated rotating speed, judging that the first fan is in a stable running state.
Referring to fig. 3, fig. 3 shows an operation process of the controller 20, where the first fan operates at a preset starting voltage U, 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, so that the first fan rotating speed reaches f0 and runs smoothly. After the first fan runs stably, detecting a first input voltage U of the first fan, and comparing the first input voltage U with a preset first voltage threshold Uh. If U is less than Uh, executing defrosting operation, otherwise, continuing to operate; when defrosting is executed, the defrosting temperature Th of the evaporator is collected in real time, and defrosting is stopped when the defrosting temperature Th reaches the preset defrosting exit temperature Tend.
Optionally, the first voltage threshold satisfies the following equation:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage collected after the surface of the evaporator is not frosted or single defrosting is finished and the first fan operates stably; delta U is the difference of the input voltage of the first fan when the evaporator is in a frost-free state and a complete frost state; eta is the frosting coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; UX is the input voltage UX of the first fan corresponding to the power consumption change turning point 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 used for judging the frosting amount based on the actual running state of the fan, and can avoid the judgment error of the frosting amount caused by different food storage amounts and food stacking modes, air duct assembly in batch production, motor parameters and fluctuation of controller hardware parameters, thereby improving the judgment accuracy.
When the surface of the evaporator is not frosted or after single defrosting is finished, the controller starts the first fan to operate stably, and then the first input voltage U0 is collected. And then acquiring a first input voltage U of the first fan and comparing U with U0-eta delta U when the first fan is stably operated in each refrigerating period. When U < U0- Δ U, defrosting is performed. Δ U and η are determined by prototype testing. For example, the refrigerator is started to operate to ensure that no frost is formed on the evaporator, 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 frost, the recorded first input voltage is [ U0, U1.. UN ] in sequence, and meanwhile, the power consumption of each refrigeration cycle is calculated. The power consumption inevitably shows a trend of changing constantly and then slowly increasing. And finding the first input voltage UX of the fan corresponding to the power consumption change turning point, wherein eta is (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 operation 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 prompt information for cleaning the condenser.
For example, when the condenser is dusted, 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 also changed correspondingly. For example, when the surface of the condenser is covered with dust flocks, the air circulation flow rate is reduced, and the second input voltage (power) of the second fan is reduced at the same rotating speed. By utilizing the characteristic, the corresponding relation between the dust accumulation 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, indirectly judge condenser laying dust degree, remind the user in time to remove dust. The second voltage threshold may be obtained via laboratory measurements. And when the second fan runs, detecting a second input voltage U of the second fan in real time, and comparing the second input voltage U with a preset second voltage threshold Ub. And if U is less than Ub, sending a reminding instruction to the display panel, otherwise, continuing to operate.
Compared with the prior art, the refrigerator disclosed by the embodiment of the invention can establish the corresponding relation between the frosting amount of the evaporator and the first input voltage of the first fan at a specific rotating speed by utilizing the correlation between the frosting amount 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 started in due time. Can accurately discern the evaporimeter degree of frosting, open the defrosting heating pipe at better moment and change the frost to the evaporimeter, avoid too early defrosting to cause the energy extravagant, also avoid changing the frost untimely refrigerator refrigeration performance that leads to worsen, realize changing the frost as required in the in-service 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 refrigerator defrosting control method according to an embodiment of the present invention, where the refrigerator defrosting control method includes:
s1, when a first fan in the refrigerator is detected to enter a stable operation 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, executing defrosting operation after the refrigerator is shut down;
s3, acquiring the defrosting temperature of the evaporator in the defrosting operation process;
and S4, stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
For example, the conventional air-cooled refrigerator mainly includes a refrigeration system including a compressor, a condenser, a capillary tube, and an evaporator, a cold air circulation system including an evaporator, a first fan, an air duct, and a compartment, a compressor compartment heat dissipation system including a condenser, a second fan, and a compressor, and a control system. The evaporator is arranged between the box body air duct and the inner container, the first fan is located on the upper portion of the evaporator, and when the first fan operates, the cold quantity of the evaporator is transferred into the compartment through air circulation, so that the refrigerating and cooling processes are achieved. In addition, the bottom of the evaporator is provided with a defrosting heating pipe, and when a defrosting command is received, the defrosting heating pipe is electrified to generate heat 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, cover behind the compressor and be equipped with the louvre, the circulation of air of being convenient for, when the second fan operates, pressure differential around the second fan orders about the box around the air gets into the compressor storehouse through the louvre on right side, through end condenser, second fan, compressor in proper order, discharges through left louvre at last, and at this in-process, the circulation air takes away the heat of condenser and compressor.
Optionally, the refrigerator defrosting control method further comprises:
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 a preset rated rotating speed, judging that the first fan is in a stable running state.
Illustratively, the first fan operates at a preset starting voltage U, and the real-time rotating 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, so that the first fan rotating speed reaches f0 and runs smoothly. After the first fan runs stably, detecting a first input voltage U of the first fan, and comparing the first input voltage U with a preset first voltage threshold Uh. If U is less than Uh, executing defrosting operation, otherwise, continuing to operate; when defrosting is executed, the defrosting temperature Th of the evaporator is collected in real time, and defrosting is stopped when the defrosting temperature Th reaches the preset defrosting exit temperature Tend.
Optionally, the first voltage threshold satisfies the following equation:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage collected after the surface of the evaporator is not frosted or single defrosting is finished and the first fan operates stably; delta U is the difference of the input voltage of the first fan when the evaporator is in a frost-free state and a complete frost state; eta is the frosting coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; UX is the input voltage UX of the first fan corresponding to the power consumption change turning point 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 used for judging the frosting amount based on the actual running state of the fan, and can avoid the judgment error of the frosting amount caused by different food storage amounts and food stacking modes, air duct assembly in batch production, motor parameters and fluctuation of controller hardware parameters, thereby improving the judgment accuracy.
When the surface of the evaporator is not frosted or after single defrosting is finished, the controller starts the first fan to operate stably, and then the first input voltage U0 is collected. Thereafter, during each refrigeration cycle when the first fan is operating steadily, a first fan input voltage U is collected and U0-eta delta U is compared. When U < U0- Δ U, defrosting is performed. Δ U and η are determined by prototype testing. For example, the refrigerator is started to operate to ensure that no frost is formed on an evaporator, when the first fan stably operates in each refrigeration cycle, the first input voltage of the first fan is collected until the evaporator is full of frost, and the recorded first input voltage is [ U0, U1.. UN ] in sequence, and meanwhile, the power consumption of each refrigeration cycle is calculated. The power consumption inevitably shows a trend of changing constantly and then slowly increasing. Finding the first input voltage UX corresponding to the power consumption change turning point, η ═ U0-UX)/(U0-UN).
Still further, the refrigerator defrosting control method further includes:
when the second fan is detected to enter a stable operation 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 the condenser is dusted, 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 also changed correspondingly. For example, when the surface of the condenser is covered with dust flocks, the air circulation flow rate is reduced, and the second input voltage (power) of the second fan is reduced at the same rotating speed. By utilizing the characteristic, the corresponding relation between the dust collecting 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, indirectly judge condenser laying dust degree, remind the user in time to remove dust. The second voltage threshold may be obtained via laboratory measurements. And when the fan runs, detecting a second input voltage U 'of the fan in real time, and comparing the second input voltage U' with a preset second voltage threshold Ub. And if the U' is less than the 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 amount of the evaporator and the first input voltage of the first fan at a specific rotating speed by utilizing the correlation between the frosting amount on 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 started in due time. Can accurately discern the evaporimeter degree of frosting, open the defrosting heating pipe at better moment and change the frost to the evaporimeter, avoid too early defrosting to cause the energy extravagant, also avoid changing the frost untimely refrigerator refrigeration performance that leads to worsen, realize changing the frost as required in the in-service 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 embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A refrigerator, characterized by comprising:
the cold air circulating system comprises an evaporator and a first fan, the evaporator is arranged between the box body air duct 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 compartment through air circulation;
the controller is configured to:
when the first fan is detected to enter a stable operation state, acquiring a first input voltage of the first fan;
when the first input voltage is smaller than a preset first voltage threshold value, executing defrosting operation after the refrigerator is shut down;
acquiring the defrosting temperature of the evaporator in the defrosting operation process;
and stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
2. The refrigerator of claim 1, wherein 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 a preset rated rotating speed, judging that the first fan is in a stable running state.
3. The refrigerator of claim 1, further comprising:
the heat dissipation system comprises a condenser and a second fan, and 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 operation 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 prompt information for cleaning the condenser.
4. The refrigerator of claim 1, wherein the first voltage threshold satisfies the following equation:
Uh＝U0-ηΔU；
η＝(U0-UX)/(U0-UN)；
wherein Uh is the first voltage threshold; u0 is input voltage collected after the surface of the evaporator is not frosted or single defrosting is finished and the first fan operates stably; delta U is the difference of the input voltage of the first fan when the evaporator is in a frost-free state and a complete frost state; eta is the frosting coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; UX is the input voltage UX of the first fan corresponding to the power consumption change turning point in the power consumption of the refrigeration cycle.
5. A refrigerator defrosting control method is characterized by comprising the following steps:
when a first fan in a refrigerator is detected to enter a stable operation state, acquiring a first input voltage of the first fan; the first fan is arranged at the upper part of the evaporator in the refrigerator;
when the first input voltage is smaller than a preset first voltage threshold value, executing defrosting operation after the refrigerator is shut down;
acquiring the defrosting temperature of the evaporator in the defrosting operation process;
and stopping defrosting when the defrosting temperature reaches a preset defrosting exit temperature.
6. The refrigerator defrosting control method of claim 5, wherein the method further comprises:
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 a preset rated rotating speed, judging that the first fan is in a stable running state.
7. The refrigerator defrosting control method of claim 5, wherein the method further comprises:
when the second fan is detected to enter a stable operation state, acquiring a second input voltage of the second fan; the second fan is arranged on one side of the condenser in the refrigerator;
and when the second input voltage is smaller than a preset second voltage threshold value, sending prompt information for cleaning the condenser.
8. The refrigerator defrosting control method of claim 5, wherein 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 collected after the surface of the evaporator is not frosted or single defrosting is finished and the first fan operates stably; delta U is the difference of the input voltage of the first fan when the evaporator is in a frost-free state and a complete frost state; eta is the frosting coefficient; UN is the input voltage of the first fan when the evaporator is full of frost; UX is the input voltage UX of the first fan corresponding to the power consumption change turning point in the power consumption of the refrigeration cycle.
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