CN108050767B - Refrigerator and defrosting control method thereof - Google Patents
Refrigerator and defrosting control method thereof Download PDFInfo
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- CN108050767B CN108050767B CN201711450424.8A CN201711450424A CN108050767B CN 108050767 B CN108050767 B CN 108050767B CN 201711450424 A CN201711450424 A CN 201711450424A CN 108050767 B CN108050767 B CN 108050767B
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- refrigerator
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- evaporator
- defrosting
- temperature
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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
- F25D21/002—Defroster control
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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
- F25D21/002—Defroster control
- F25D21/004—Control mechanisms
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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
- F25D21/08—Removing frost by electric heating
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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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
Abstract
The invention also provides a refrigerator and a defrosting control method thereof. The method adjusts the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator. When the surface temperature of the evaporator rises to a certain temperature value, the voltage applied to the electromagnetic defrosting device is reduced and adjusted, so that the power of the electromagnetic defrosting device is reduced. According to the defrosting control method, when the surface frost accumulation of the evaporator is thick and the temperature is low, the electromagnetic defrosting device is operated at high power, so that the defrosting efficiency is improved; when the frost accumulation on the surface of the evaporator is less and the temperature is higher, the electromagnetic defrosting device is operated at low power so as to avoid the too fast temperature rise on the surface of the evaporator. The method determines the operating power of the electromagnetic defrosting device according to the specific defrosting condition of the evaporator, improves the defrosting efficiency and optimizes the working process of the electromagnetic defrosting device while ensuring the normal and stable rise of the surface temperature of the evaporator.
Description
Technical Field
The invention relates to a refrigerating and freezing device, in particular to a refrigerator and a defrosting control method thereof.
Background
After the air-cooled refrigerator runs for a period of time, the evaporator of the air-cooled refrigerator can generate a frosting condition, and the frosting condition can influence the running efficiency of the air-cooled refrigerator, so that the refrigerator needs to perform defrosting operation on the evaporator after the refrigerator is cooled for a period of time.
A defrosting heating wire is arranged in the existing refrigerator and close to the evaporator, and the evaporator is heated by utilizing heat radiation after the heating wire is electrified so as to achieve the aim of defrosting. However, in the conventional electric heating defrosting, the evaporator at the position close to the heating wire has higher temperature and higher defrosting speed, and the evaporator at the position far away from the heating wire has lower defrosting speed, so that the integral defrosting of the evaporator is easy to be uneven. In addition, the electric heating defrosting can simultaneously heat the air around the evaporator, thereby not only causing heat energy loss, but also prolonging the defrosting time.
In addition, the defrosting method used by the existing refrigerator is that preset time is set according to experience data, defrosting is automatically started after the refrigerator refrigerates for a certain time, and defrosting is stopped after the refrigerator defrosts for a certain time. However, this method of empirically setting the defrosting start point and end point is not effective in defrosting because the frosting/defrosting state cannot be clearly defined. Particularly, when the defrosting is determined to be stopped, if the frosting on the evaporator is not completely eliminated, the defrosting is stopped, so that the defrosting is insufficient, and the subsequent refrigerating effect of the evaporator is further influenced; if the frost on the evaporator is completely eliminated, but the heating wire is not stopped, the energy waste is caused, and the service life of the defrosting device is also influenced.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a refrigerator and a defrosting control method thereof that overcome or at least partially solve the above problems.
An object of the present invention is to improve a defrosting effect of a refrigerator.
Another object of the present invention is to accurately determine the termination time point of the defrosting process.
In one aspect, the present invention provides a defrosting control method for a refrigerator, the refrigerator including an electromagnetic defrosting apparatus for performing electromagnetic radiation defrosting on an evaporator of the refrigerator, the method including: in the process of refrigerating operation of the refrigerator, detecting that the refrigerator reaches a defrosting condition; starting an electromagnetic defrosting device to start defrosting, and continuously detecting the surface temperature of an evaporator and the power of the electromagnetic defrosting device; adjusting the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator; judging whether the surface temperature of the evaporator reaches a preset temperature or not, and judging whether the power of the electromagnetic defrosting device reaches a target power or not; if yes, the electromagnetic defrosting device is turned off, and defrosting is finished.
Optionally, the step of adjusting the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator comprises; judging whether the surface temperature is less than or equal to a first temperature; if yes, adjusting the voltage applied to the electromagnetic defrosting device to a first preset voltage value; if not, judging whether the surface temperature is less than or equal to the second temperature and greater than the first temperature; if yes, adjusting the voltage applied to the electromagnetic defrosting device to a second preset voltage value; if not, adjusting the voltage applied to the electromagnetic defrosting device to a third preset voltage value; the first preset voltage value is greater than the second preset voltage value, the second preset voltage value is greater than the third preset voltage value, and the first temperature is less than the second temperature.
Optionally, before the step of detecting that the refrigerator reaches the defrosting condition, the method further comprises: when the refrigerator is powered on and started for the first time, the target power of the electromagnetic defrosting device is determined.
Optionally, when the refrigerator is powered on and started for the first time, the step of determining the target power of the electromagnetic defrosting device includes: detecting the surface temperature of the evaporator; judging whether the surface temperature of the evaporator reaches a preset temperature or not; if so, starting the electromagnetic defrosting device, adjusting the voltage applied to the electromagnetic defrosting device to a third preset voltage value, and continuously operating the electromagnetic defrosting device for a first preset time period; and during the continuous operation of the electromagnetic defrosting device, calculating the average power in the last second preset time period as the target power.
Optionally, the step of detecting that the refrigerator reaches the defrosting condition comprises: recording the continuous operation time of the refrigerator and the accumulated opening times of the door body of the refrigerator in the continuous operation time; judging whether the continuous operation time of the refrigerator reaches a preset accumulated operation time or not, wherein the accumulated opening times of the door body exceed the preset times; if yes, determining that the refrigerator reaches a defrosting condition.
In another aspect, the present invention also provides a refrigerator, including: a refrigeration cycle system composed of a compressor, an evaporator and a condenser; an electromagnetic defrosting device disposed toward the evaporator, configured to heat the evaporator by radiating electromagnetic waves thereto to defrost the evaporator; the temperature detection device is arranged on the surface of the evaporator and is configured to detect the surface temperature of the evaporator; the power detection device is electrically connected with the electromagnetic defrosting device and is configured to detect the operating power of the electromagnetic defrosting device; the voltage adjusting device is electrically connected with the temperature detecting device and the electromagnetic defrosting device and is configured to adjust the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator; the electromagnetic defrosting device is configured to be started to defrost when the refrigerator is detected to reach a defrosting condition in the refrigerating operation process of the refrigerator; and is also configured to be closed to finish defrosting under the condition that the surface temperature of the evaporator reaches the preset temperature and the power of the electromagnetic defrosting device reaches the target power.
Optionally, the voltage adjusting device is further configured to adjust the voltage applied to the electromagnetic defrosting device to a first preset voltage value when the surface temperature is equal to or lower than a first temperature; under the condition that the surface temperature is less than or equal to the second temperature and greater than the first temperature, the voltage applied to the electromagnetic defrosting device is adjusted to be a second preset voltage value; under the condition that the surface temperature is higher than the second temperature, the voltage applied to the electromagnetic defrosting device is adjusted to be a third preset voltage value; the first preset voltage value is greater than the second preset voltage value, the second preset voltage value is greater than the third preset voltage value, and the first temperature is less than the second temperature.
Optionally, the power detection device is further configured to determine a target power of the electromagnetic defrosting device when the refrigerator is powered on for the first time.
Optionally, the electromagnetic defrosting device is further configured to be turned on when the refrigerator is powered on for the first time and the surface temperature of the evaporator reaches a preset temperature, and operate continuously for a first preset time period at a working voltage of a third preset voltage value; the power detection device is further configured to calculate the average power in the last second preset time period as the target power during the continuous operation of the electromagnetic defrosting device.
Optionally, the refrigerator further comprises: an operation time detecting device configured to record a continuous operation time of the refrigerator; the door body opening and closing detection device is arranged on a door body or a refrigerator body of the refrigerator and is configured to record the opening times of the door body in the continuous operation time of the refrigerator; the electromagnetic defrosting device is configured to be started when the continuous operation time of the refrigerator reaches a preset accumulated operation time and the accumulated opening times of the door body exceed the preset times.
The invention provides a refrigerator. The refrigerator provided by the invention utilizes the electromagnetic defrosting device to defrost the evaporator, the electromagnetic defrosting device heats the evaporator by adopting a magnetic field induction eddy current heating principle, and compared with the prior art in which heating wires are used for defrosting, the defrosting effect is better. Specifically, the electromagnetic defrosting device can uniformly emit electromagnetic radiation to each part of the evaporator, so that the whole evaporator can be uniformly heated, and all parts of the evaporator are more uniformly defrosted. In addition, only metal can receive electromagnetic waves to convert magnetic energy into heat energy, so that the electromagnetic defrosting device only heats the surface of the evaporator and does not heat air around the evaporator. Therefore, the refrigerator of the embodiment can defrost more directly and quickly, heating of positions except for frosting is avoided, and the heat energy utilization efficiency is improved.
Further, the invention also provides a defrosting control method. The method adjusts the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator. When the surface temperature of the evaporator rises to a certain temperature value, the voltage applied to the electromagnetic defrosting device is reduced and adjusted, so that the power of the electromagnetic defrosting device is reduced. According to the defrosting control method, when the surface frost accumulation of the evaporator is thick and the temperature is low, the electromagnetic defrosting device is operated at high power, so that the defrosting efficiency is improved; when the frost accumulation on the surface of the evaporator is less and the temperature is higher, the electromagnetic defrosting device is operated at low power so as to avoid the too fast temperature rise on the surface of the evaporator. The method determines the operating power of the electromagnetic defrosting device according to the specific defrosting condition of the evaporator, improves the defrosting efficiency and optimizes the working process of the electromagnetic defrosting device while ensuring the normal and stable rise of the surface temperature of the evaporator.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic view of an evaporator and an electromagnetic defrosting apparatus of a refrigerator according to one embodiment of the present invention;
FIG. 2 is a schematic block diagram of a refrigerator according to one embodiment of the present invention;
fig. 3 is a schematic view of a defrosting control method of a refrigerator according to one embodiment of the present invention;
fig. 4 is a flowchart of a defrosting control method of a refrigerator according to one embodiment of the present invention.
Detailed Description
As shown in fig. 1 and 2, an embodiment of the present invention provides a refrigerator. In this embodiment, the refrigerator is an air-cooled refrigerator, and the air-cooled refrigerator includes: a door body, a cabinet body and a refrigeration cycle system consisting of a compressor 100, an evaporator 300 and a condenser 200. The interior of the box body forms a storage compartment and an air supply duct located at the rear part of the storage compartment, and the evaporator 300 is arranged in the air supply duct. The inside fan that still is provided with in air supply wind channel, the fan is used for carrying the dry cold air after the evaporimeter 300 cooling in the wind channel to the storage compartment indoor to refrigerate the storage compartment. Air entering the storage compartment is circulated back into the air duct. The air-cooled refrigerator utilizes the air flow circulation principle to refrigerate the storage compartment.
The refrigerator of the present embodiment further includes: the electromagnetic defrosting device 400. The electromagnetic defrosting device 400 is disposed in the air duct and toward the evaporator 300, and is configured to heat the evaporator 300 by radiating electromagnetic waves to the evaporator 300 to defrost the evaporator 300. The electromagnetic defrosting device 400 heats the evaporator 300 by using the magnetic field induced eddy current heating principle, an electromagnetic coil is arranged in the electromagnetic defrosting device, and a magnetic field is generated by passing current through the coil, when the magnetic force in the magnetic field passes through the evaporator 300, countless small eddy currents are generated on the surface of the shell of the evaporator 300, so that metal ions in the shell of the evaporator 300 move at a high speed, and the temperature of the evaporator 300 is rapidly increased. The electromagnetic defrosting device 400 converts electric energy into magnetic energy and converts the magnetic energy into heat energy, so that the evaporator 300 can rapidly generate heat, and the frost is directly melted after the evaporator 300 generates heat.
The refrigerator of this embodiment utilizes electromagnetism defrosting device 400 to defrost evaporator 300, and compared with the prior art, uses the heater strip to defrost, and the defrosting effect is better. Specifically, the electromagnetic defrosting device 400 can uniformly emit electromagnetic radiation to each part of the evaporator 300, and the temperature of the whole evaporator 300 can be uniformly increased, so that each part of the evaporator 300 is more uniformly defrosted. In addition, since only metal can receive electromagnetic waves and convert magnetic energy into heat energy, the electromagnetic defrosting apparatus 400 heats only the surface of the evaporator 300 and does not heat the air around the evaporator 300. Therefore, the refrigerator of the embodiment can defrost more directly and quickly, heating of positions except for frosting is avoided, and the heat energy utilization efficiency is improved.
The electromagnetic defrosting device 400 is internally provided with a frosting degree detection module and a power adjustment module, and the frosting degree detection module comprehensively judges the frosting degree of the evaporator 300 by detecting the surface temperature of the evaporator 300 and/or detecting the frosting thickness of the surface of the evaporator 300 and combining other factors. The power adjusting module finely adjusts the working power of the electromagnetic defrosting device 400 according to the determined frosting degree so as to adapt to different working environments. Generally, during defrosting, when the frosting degree gradually decreases (as the evaporator 300 becomes frosted and thinner and the surface temperature thereof increases), the power of the electromagnetic defrosting device 400 is adjusted by the power adjusting module to slightly increase.
The refrigerator of the present embodiment further includes: temperature detection means 310, power detection means 410 and voltage regulation means 420. The temperature detecting device 310 is disposed on a surface of the evaporator 300 and configured to detect a surface temperature of the evaporator 300. In this embodiment, the temperature detecting device 310 may be a temperature sensor. The temperature sensor is electrically connected to the electromagnetic defrosting apparatus 400, and the electromagnetic defrosting apparatus 400 can receive temperature data detected by the temperature sensor.
The power detection device 410 is electrically connected to the electromagnetic defrosting device 400 and configured to detect the operating power of the electromagnetic defrosting device 400. In this embodiment, the power detection device 410 may be disposed on a main control board of the refrigerator, and the power detection device 410 calculates the instantaneous power of the electromagnetic defrosting device 400 by detecting the voltage across the electromagnetic defrosting device 400 and the current passing through the electromagnetic defrosting device 400.
The voltage adjusting device 420 is electrically connected to the temperature detecting device 410 and the electromagnetic defrosting device 400, and is configured to adjust the voltage applied to the electromagnetic defrosting device 400 according to the surface temperature of the evaporator 300. The power of the electromagnetic defrosting apparatus 400 is related to the voltage applied across the electromagnetic defrosting apparatus, and therefore, the power of the electromagnetic defrosting apparatus 400 is higher as the voltage across the electromagnetic defrosting apparatus 400 is higher, which can be adjusted by the voltage adjusting apparatus 420. The voltage adjusting device 420 has a main adjusting function on the power of the electromagnetic defrosting device 400, and the power adjusting module built in the electromagnetic defrosting device 400 only slightly adjusts the working power of the electromagnetic defrosting device 400 according to the frosting degree of the evaporator. In this embodiment, the voltage adjusting device 420 may be a thermistor connected in series with the electromagnetic defrosting device 400, and the thermistor changes its resistance value according to the temperature of the evaporator 300, thereby adjusting the voltage applied to the electromagnetic defrosting device 400.
Specifically, the voltage adjusting device 420 is further configured to adjust the voltage applied to the electromagnetic defrosting device 400 to a first preset voltage value in the case that the surface temperature is equal to or lower than the first temperature; under the condition that the surface temperature is less than or equal to the second temperature and greater than the first temperature, adjusting the voltage applied to the electromagnetic defrosting device 400 to a second preset voltage value; in case that the surface temperature is greater than the second temperature, the voltage applied to the electromagnetic defrosting apparatus 400 is adjusted to a third preset voltage value. The first temperature and the second temperature may be set according to a maximum temperature (hereinafter, referred to as an upper limit temperature) to which the evaporator 300 can be heated. In the present embodiment, the first temperature is set to be 30 ℃ lower than the upper limit temperature, and the second temperature is set to be 20 ℃ lower than the upper limit temperature, for example: the upper temperature limit is set to 5 c, and the corresponding first and second temperatures are-25 c and-15 c, respectively.
The electromagnetic defrosting device 400 is configured to start defrosting when the refrigerator is detected to reach a defrosting condition during the refrigerating operation of the refrigerator; and is also configured to be turned off to finish defrosting in case that the surface temperature of the evaporator 300 reaches a preset temperature and the power of the electromagnetic defrosting device 400 reaches a target power.
The predetermined temperature is 0 c, i.e., the freezing temperature, and when the temperature of the evaporator 300 reaches 0 c, the frost formation of the surface evaporator 300 is substantially removed. In the present embodiment, in order to more accurately determine whether the frost formation is completely removed, the power detection device 410 further detects the power of the electromagnetic defrosting device 400. According to the above description, under the condition that the voltage across the electromagnetic defrosting device 400 is constant, the working power of the electromagnetic defrosting device 400 changes according to the frosting degree of the evaporator 300, that is, the working power of the electromagnetic defrosting device 400 has a certain corresponding relationship with the frosting degree, the target power represents that the voltage across the electromagnetic defrosting device 400 is set to be the third preset voltage value, the surface temperature of the evaporator 300 is 0 ℃, and the power of the electromagnetic defrosting device 400 is set when there is no frosting. Therefore, when the electromagnetic defrosting apparatus 400 is raised to the target power, it indicates that the frost on the surface of the evaporator 300 has been removed. In the present embodiment, the defrosting termination time point is determined by combining the surface temperature of the evaporator 300 and the operating power of the electromagnetic defrosting device 400, and it can be more accurately determined when defrosting is terminated. Preventing the evaporator 300 from defrosting insufficiently and affecting the subsequent refrigeration of the evaporator 300.
The power detection device 410 is further configured to determine a target power of the electromagnetic defrosting device 400 when the refrigerator is powered on for the first time. The target power represents a power value which can be reached by the power adjusting module when the frost is completely removed in the defrosting process of the refrigerator.
The electromagnetic defrosting apparatus 400 is further configured to be turned on and continuously operated for a first preset time period at an operating voltage of a third preset voltage value in a case where the surface temperature of the evaporator 300 reaches a preset temperature when the refrigerator is first powered on. The power detection device 410 also calculates the average power in the last second preset time period as the target power during the continuous operation of the electromagnetic defrosting device 400. In this embodiment, the preset temperature is 0 ℃, the first preset time period is 30s, and the second preset time period is 5 s. When the refrigerator is first powered on and started, the temperature of the evaporator 300 will gradually decrease from above 0 ℃ as the cooling process continues. When the temperature of the evaporator 300 is reduced to 0 ℃, the surface of the evaporator starts to frost, at this time, the electromagnetic defrosting device 400 is turned on, the voltage applied to the electromagnetic defrosting device 400 is adjusted to a third preset voltage value, and the electromagnetic defrosting device 400 is controlled to continuously operate for 30 s. When the electromagnetic defrosting device 400 is just started, the power value of the electromagnetic defrosting device 400 fluctuates, and after the power of the electromagnetic defrosting device 400 tends to be stable, the power value of the electromagnetic defrosting device is recorded. Specifically, the power detection device 410 detects the average power value of the last 5 seconds within 30s of the operation of the electromagnetic defrosting device 400. The average power value is a power value corresponding to the electromagnetic defrosting device 400 when the surface of the evaporator 300 is at 0 ℃ and there is no frost, that is, the target power.
The above refrigerator further includes: an operation time detection device 520 and a door opening/closing detection device 510. And an operation time detecting device 520 configured to record the continuous operation time of the refrigerator. In this embodiment, the operation time detecting device 520 may be a timing device disposed on the main control board of the refrigerator. The door opening and closing detection device 510 is disposed on a door or a cabinet of the refrigerator, and is configured to record the number of times the door is opened during the continuous operation time of the refrigerator. In this embodiment, the door opening/closing detection device 510 includes a pressure sensor and a counter, the pressure sensor is disposed on the door or the box, the pressure sensor determines whether the door is opened by sensing the pressure on the door or the box, and the counter records the number of times the door is opened.
The electromagnetic defrosting device 400 is configured to be turned on when the continuous operation time of the refrigerator reaches a preset accumulated operation time and the accumulated opening times of the door body exceeds a preset number. Generally, the degree of frost formation on the surface of the evaporator 300 is related to the accumulated operation time of the refrigerator and the accumulated door opening times of the refrigerator. The longer the operation time of the refrigerator, the lower the temperature of the evaporator 300, and the more easily frosted; meanwhile, each time a user opens the door body, moisture in the external environment of the refrigerator enters the air duct, and frosting is easily formed on the surface of the evaporator 300, so that the more the door body is opened, the more the evaporator 300 is easily frosted. In this embodiment, when the refrigerator performs cumulative cooling operation for M hours and the door is opened for N times, it is determined that the refrigerator meets the defrosting condition, and the electromagnetic defrosting device 400 starts defrosting. The above M and N may be set according to a specific model of the refrigerator.
The compressor 100 is also configured to be turned off before the electromagnetic defrosting apparatus 400 is turned on, so that the refrigerator suspends cooling. Before the refrigerator is ready to begin defrosting, the compressor 100 is turned off to stop cooling. After the refrigerator stops cooling for a period of time and the temperature of the evaporator 300 slightly rises, the defrosting process is performed to prevent the evaporator 300 from being damaged due to sudden temperature rise of the evaporator 300.
The present invention also provides a refrigerator defrosting control method, and fig. 3 is a schematic view of a refrigerator defrosting control method according to an embodiment of the present invention, which generally includes the steps of:
step S302, in the process of refrigerating operation of the refrigerator, the refrigerator is detected to reach a defrosting condition. After the air-cooled refrigerator operates for a period of time, the evaporator 300 of the air-cooled refrigerator may be frosted, which affects the operation efficiency of the air-cooled refrigerator, and therefore the refrigerator needs to perform a defrosting operation on the evaporator 300 after the refrigerator operates for a period of time. In the embodiment of the present invention, the defrosting condition may be that the surface temperature of the evaporator 300 is reduced to a certain degree, or that the number of times of opening the door of the refrigerator reaches a certain number of times. In other embodiments of the present invention, the defrosting condition may be that the surface of the evaporator 300 is frosted to a certain thickness.
Step S304, turning on the electromagnetic defrosting apparatus 400 to start defrosting, and continuously detecting the surface temperature of the evaporator 300 of the refrigerator and the power of the electromagnetic defrosting apparatus 400. When the refrigerator reaches the defrosting condition, it indicates that the refrigerator needs to be defrosted, and at this time, the electromagnetic defrosting device 400 is turned on to start the defrosting process. In the defrosting process, the surface temperature of the evaporator 300 of the refrigerator and the power of the electromagnetic defrosting device 400 are detected in real time, and the defrosting ending time point is determined according to the numerical values of the two data.
In step S306, the voltage applied to the electromagnetic defrosting apparatus 400 is adjusted according to the surface temperature of the evaporator 300. Specifically, every time the surface temperature of the evaporator 300 rises by a certain temperature value, the voltage applied to the electromagnetic defrosting apparatus 400 is adjusted to be reduced, so as to reduce the power of the electromagnetic defrosting apparatus 400. According to the method provided by the embodiment of the invention, when the frost accumulation on the surface of the evaporator 300 is thicker and the temperature is lower, the electromagnetic defrosting device 400 is operated at high power so as to improve the defrosting efficiency; when the frost accumulation on the surface of the evaporator 300 is less and the temperature is higher, the electromagnetic defrosting device 400 is operated at low power to avoid the rapid temperature rise on the surface of the evaporator 300. The defrosting control method of the embodiment determines the operation power of the electromagnetic defrosting device 400 according to the specific defrosting condition of the evaporator, so that the defrosting efficiency is improved and the operation process of the electromagnetic defrosting device 400 is optimized while the normal and stable rise of the surface temperature of the evaporator 300 is ensured.
Step S308, determining whether the surface temperature of the evaporator 300 reaches a preset temperature, and the power of the electromagnetic defrosting device 400 reaches the target power and reaches the target power. The predetermined temperature is 0 c, i.e., the freezing temperature, and when the temperature of the evaporator 300 reaches 0 c, it indicates that the frost formation of the evaporator 300 has been substantially removed. In the present embodiment, in order to more accurately determine whether the frost formation is completely removed, the power detection device 410 further detects the power of the electromagnetic defrosting device 400. As described above, due to the built-in power adjustment module, the working power of the electromagnetic defrosting apparatus 400 is changed according to the frosting degree of the evaporator 300, that is, the working power of the electromagnetic defrosting apparatus 400 has a certain corresponding relationship with the frosting degree, the target power represents that the working voltage of the electromagnetic defrosting apparatus 400 is the third preset voltage value, the surface temperature of the evaporator 300 is 0 ℃, and the power of the electromagnetic defrosting apparatus 400 is not frosted.
When the surface temperature of the evaporator 300 reaches above-15 ℃, and the voltage across the electromagnetic defrosting device 400 reaches a third preset voltage value, the power of the electromagnetic defrosting device 400 gradually and slowly increases along with the continuous defrosting process, and when the power of the electromagnetic defrosting device 400 increases to the target power, it indicates that the frosting on the surface of the evaporator 300 is completely removed. In the present embodiment, the defrosting termination time point is determined by combining the surface temperature of the evaporator 300 and the operating power of the electromagnetic defrosting device 400, so that it can be more accurately determined when defrosting is finished. Preventing the evaporator 300 from defrosting insufficiently and affecting the subsequent refrigeration of the evaporator 300. In addition, by setting the target power, the power of the electromagnetic defrosting device 400 can be prevented from being too high, the electromagnetic defrosting device 400 can be protected, and the service life of the electromagnetic defrosting device 400 is prolonged.
In step S310, if the determination result in step S308 is yes, the electromagnetic defrosting device 400 is turned off, and defrosting is finished. When the surface temperature of the evaporator 300 reaches 0 ℃ and the power of the electromagnetic defrosting device 400 reaches the target power, the defrosting process of the refrigerator evaporator 300 is finished, and after waiting for a certain time, the refrigerator restarts the compressor 100 for refrigeration.
Fig. 4 is a flowchart of a refrigerator defrosting control method according to an embodiment of the present invention, which sequentially performs the following steps:
in step S402, when the refrigerator is powered on for the first time, the surface temperature of the evaporator 300 is continuously detected. When the refrigerator is first powered on and started, the temperature of the evaporator 300 will gradually decrease from above 0 ℃ as the cooling process continues.
In step S404, it is determined whether the surface temperature of the evaporator 300 reaches a preset temperature. In the present embodiment, the preset temperature is 0 ℃.
In step S406, if the determination result in step S404 is yes, the electromagnetic defrosting device 400 is turned on and continuously operates for 30 seconds. When the temperature of the evaporator 300 is reduced to 0 ℃, the surface of the evaporator starts to frost, and at this time, the electromagnetic defrosting device 400 is turned on, the voltage applied to the electromagnetic defrosting device 400 is adjusted to a third preset voltage value, and the electromagnetic defrosting device 400 is controlled to continuously operate for 30 s.
In step S408, during the continuous operation of the electromagnetic defrosting apparatus 400, the average power in the last 5S is calculated as the target power. When the electromagnetic defrosting device 400 is just started, the power value of the electromagnetic defrosting device 400 fluctuates, and after the power of the electromagnetic defrosting device 400 tends to be stable, the power value of the electromagnetic defrosting device is recorded. Specifically, the power detection device 410 detects the average power value of the last 5 seconds within 30s of the operation of the electromagnetic defrosting device 400. The average power value is a power value corresponding to the electromagnetic defrosting device 400 when the voltage of the electromagnetic defrosting device 400 is a third preset voltage value, the surface of the evaporator 300 is at 0 ℃ and there is no frost.
And step S410, recording the continuous operation time of the refrigerator and the accumulated opening times of the door body of the refrigerator in the continuous operation time.
Step S412, determining whether the continuous operation time of the refrigerator reaches a preset accumulated operation time, and the accumulated opening times of the door exceeds the preset times. Generally, the degree of frost formation on the surface of the evaporator 300 is related to the accumulated operation time of the refrigerator and the accumulated door opening times of the refrigerator. The longer the operation time of the refrigerator, the lower the temperature of the evaporator 300, and the more easily frosted; meanwhile, each time a user opens the door body, moisture in the external environment of the refrigerator enters the air duct, and frosting is easily formed on the surface of the evaporator 300, so that the more the door body is opened, the more the evaporator 300 is easily frosted. And when the accumulated running time of the refrigerator and the times of opening the door body exceed a certain degree, the refrigerator starts a defrosting process.
In step S414, if the determination result in step S412 is yes, the electromagnetic defrosting device 400 is turned on to start defrosting, and the surface temperature of the evaporator 300 of the refrigerator and the power of the electromagnetic defrosting device 400 are continuously detected. In this embodiment, when the refrigerator performs cumulative cooling operation for M hours and the door is opened for N times, it is determined that the refrigerator meets the defrosting condition, and the electromagnetic defrosting device 400 starts defrosting. The M and N are set according to the specific condition of the refrigerator.
In step S416, the voltage applied to the electromagnetic defrosting apparatus is adjusted to a first preset voltage value. When the refrigerator starts to defrost, the surface of the evaporator frosts very thickly and the temperature is very low, and is generally lower than the first temperature value. At the moment, the voltage applied to the electromagnetic defrosting device is adjusted to be a first preset voltage value, so that the electromagnetic defrosting device runs at high power to accelerate defrosting speed. In the present embodiment, the first temperature value is set to-25 ℃.
In step S418, it is determined that the surface temperature is equal to or lower than the second temperature and greater than the first temperature. As the defrosting process proceeds, frost on the surface of the evaporator 300 melts and its temperature gradually increases. In this example, the second temperature was set to-15 ℃.
In step S420, if the determination result in step S418 is yes, the voltage applied to the electromagnetic defrosting apparatus 400 is adjusted to a second preset voltage value. When the surface temperature of the evaporator rises between the first temperature and the second temperature, the voltage applied to the electromagnetic defrosting device 400 is reduced and adjusted to a second preset voltage value to slow down the defrosting rate. The second preset voltage value is smaller than the first preset voltage value.
In step S422, it is determined whether the surface temperature is equal to or higher than the second temperature. As the defrosting process proceeds, the surface temperature of the evaporator continues to rise.
In step S424, if the determination result in step S422 is yes, the voltage applied to the electromagnetic defrosting apparatus 400 is adjusted to a third preset voltage value. When the surface temperature of the evaporator 300 rises above the second temperature, the voltage applied to the electromagnetic defrosting device 400 is reduced again, and the voltage is adjusted to a third preset voltage value to further slow down the defrosting rate, so as to prevent the temperature of the evaporator 300 from rising too fast. The third preset voltage value is smaller than the second preset voltage value.
In step S426, it is determined that the surface temperature of the evaporator 300 reaches the preset temperature and the power of the electromagnetic defrosting apparatus 400 reaches the target power. The surface temperature of the evaporator 300 and the power of the electromagnetic defrosting device 400 are continuously monitored to determine the termination time point of defrosting.
In step S428, if the determination result in step S426 is yes, the electromagnetic defrosting device 400 is turned off, and defrosting is finished.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A defrosting control method of a refrigerator including an electromagnetic defrosting apparatus for performing electromagnetic radiation defrosting on an evaporator of the refrigerator, the method comprising:
in the refrigerating operation process of the refrigerator, detecting that the refrigerator reaches a defrosting condition;
starting the electromagnetic defrosting device to start defrosting, and continuously detecting the surface temperature of the evaporator and the power of the electromagnetic defrosting device;
adjusting the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator;
judging whether the surface temperature of the evaporator reaches a preset temperature or not, and judging whether the power of the electromagnetic defrosting device reaches a target power or not;
if yes, the electromagnetic defrosting device is closed, and defrosting is finished.
2. The defrosting control method of claim 1, wherein the step of adjusting the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator comprises:
judging whether the surface temperature is less than or equal to a first temperature;
if yes, adjusting the voltage applied to the electromagnetic defrosting device to a first preset voltage value;
if not, judging whether the surface temperature is less than or equal to a second temperature and greater than the first temperature;
if yes, adjusting the voltage applied to the electromagnetic defrosting device to a second preset voltage value;
if not, adjusting the voltage applied to the electromagnetic defrosting device to a third preset voltage value;
wherein
The first preset voltage value is greater than the second preset voltage value, the second preset voltage value is greater than the third preset voltage value, and the first temperature is less than the second temperature.
3. The defrosting control method of claim 2, wherein before the step of detecting that the refrigerator reaches a defrosting condition, further comprising:
and when the refrigerator is powered on and started for the first time, determining the target power of the electromagnetic defrosting device.
4. The defrosting control method according to claim 3, wherein the step of determining the target power of the electromagnetic defrosting device when the refrigerator is powered on for the first time comprises:
detecting a surface temperature of the evaporator;
judging whether the surface temperature of the evaporator reaches the preset temperature or not;
if yes, starting the electromagnetic defrosting device, adjusting the voltage applied to the electromagnetic defrosting device to a third preset voltage value, and enabling the electromagnetic defrosting device to continuously operate for a first preset time period;
and calculating the average power in the last second preset time period as the target power during the continuous operation of the electromagnetic defrosting device.
5. The defrosting control method of claim 2, wherein the step of detecting that the refrigerator reaches a defrosting condition comprises:
recording the continuous operation time of the refrigerator and the accumulated opening times of the door body of the refrigerator in the continuous operation time;
judging whether the continuous operation time of the refrigerator reaches a preset accumulated operation time or not, wherein the accumulated opening times of the door body exceed the preset times;
and if so, determining that the refrigerator reaches the defrosting condition.
6. A refrigerator, comprising:
a refrigeration cycle system composed of a compressor, an evaporator and a condenser;
an electromagnetic defrosting device disposed toward the evaporator, configured to heat the evaporator by radiating electromagnetic waves thereto to defrost the evaporator;
the temperature detection device is arranged on the surface of the evaporator and is configured to detect the surface temperature of the evaporator;
the power detection device is electrically connected with the electromagnetic defrosting device and is configured to detect the running power of the electromagnetic defrosting device;
the voltage adjusting device is electrically connected with the temperature detecting device and the electromagnetic defrosting device and is configured to adjust the voltage applied to the electromagnetic defrosting device according to the surface temperature of the evaporator; wherein
The electromagnetic defrosting device is configured to be started to defrost under the condition that the refrigerator is detected to reach a defrosting condition in the refrigerating operation process of the refrigerator; and the electromagnetic defrosting device is also configured to be turned off when the surface temperature of the evaporator reaches a preset temperature and the power of the electromagnetic defrosting device reaches a target power, so that defrosting is finished.
7. The refrigerator of claim 6, wherein
The voltage adjusting device is further configured to adjust the voltage applied to the electromagnetic defrosting device to a first preset voltage value when the surface temperature is lower than or equal to a first temperature; under the condition that the surface temperature is less than or equal to a second temperature and greater than the first temperature, adjusting the voltage applied to the electromagnetic defrosting device to a second preset voltage value; under the condition that the surface temperature is higher than the second temperature, adjusting the voltage applied to the electromagnetic defrosting device to a third preset voltage value; wherein
The first preset voltage value is greater than the second preset voltage value, the second preset voltage value is greater than the third preset voltage value, and the first temperature is less than the second temperature.
8. The refrigerator of claim 7, wherein
The power detection device is further configured to determine a target power of the electromagnetic defrosting device when the refrigerator is powered on and started for the first time.
9. The refrigerator of claim 8, wherein
The electromagnetic defrosting device is further configured to be started when the refrigerator is powered on and started for the first time and the surface temperature of the evaporator reaches the preset temperature, and continuously operates for a first preset time period under the working voltage of the third preset voltage value;
the power detection device is further configured to calculate the average power in the last second preset time period as the target power during the continuous operation of the electromagnetic defrosting device.
10. The refrigerator of claim 7, further comprising:
an operation time detecting device configured to record a continuous operation time of the refrigerator; and
the door body opening and closing detection device is arranged on a door body or a refrigerator body of the refrigerator and is configured to record the opening times of the door body in the continuous operation time of the refrigerator; wherein
The electromagnetic defrosting device is configured to be started when the continuous operation time of the refrigerator reaches a preset accumulated operation time and the accumulated opening times of the door body exceed the preset times.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711450424.8A CN108050767B (en) | 2017-12-27 | 2017-12-27 | Refrigerator and defrosting control method thereof |
| PCT/CN2018/123267 WO2019128944A1 (en) | 2017-12-27 | 2018-12-24 | Refrigerator and defrosting control method thereof |
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| CN201711450424.8A CN108050767B (en) | 2017-12-27 | 2017-12-27 | Refrigerator and defrosting control method thereof |
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| CN108050767B true CN108050767B (en) | 2020-06-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108050767B (en) * | 2017-12-27 | 2020-06-23 | 青岛海尔股份有限公司 | Refrigerator and defrosting control method thereof |
| CN110906613B (en) * | 2018-09-17 | 2021-11-26 | 海尔智家股份有限公司 | Air-cooled refrigerator |
| CN110906635A (en) * | 2018-09-17 | 2020-03-24 | 青岛海尔智能技术研发有限公司 | Heat exchanger defroster, refrigeration equipment and refrigerator |
| CN110044026A (en) * | 2019-03-26 | 2019-07-23 | 青岛海尔空调器有限总公司 | A kind of electrochemistry air-conditioning and its control method |
| KR20200116320A (en) * | 2019-04-01 | 2020-10-12 | 엘지전자 주식회사 | Refrigerator |
| CN110195960B (en) * | 2019-05-30 | 2021-01-08 | 合肥华凌股份有限公司 | Defrosting control method for refrigeration equipment, refrigeration equipment and storage medium |
| CN112797706B (en) * | 2019-11-14 | 2022-09-23 | 青岛海尔电冰箱有限公司 | Refrigerator and defrosting control method thereof |
| CN112197489B (en) * | 2020-07-17 | 2022-04-22 | Tcl家用电器（合肥）有限公司 | Evaporator defrosting method and device, refrigerator, computer equipment and storage medium |
| CN111981759B (en) * | 2020-07-22 | 2021-12-28 | 珠海格力电器股份有限公司 | Defrosting control method and device and refrigerator equipment |
| CN112179041A (en) * | 2020-09-29 | 2021-01-05 | 珠海格力电器股份有限公司 | Defrosting control method and device, refrigeration equipment and storage medium |
| CN113639499A (en) * | 2021-08-05 | 2021-11-12 | 珠海格力电器股份有限公司 | Heater control system, defrosting control method, refrigerating system and refrigerator |
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| CH702709B1 (en) * | 2010-10-19 | 2011-08-31 | Lampen Sail Ltd | Cooling apparatus comprises evaporator-defrosting unit with auxiliary defrosting system for starting the melting process prior to final melting by an electromagnetic defrosting system |
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| CN108050767B (en) * | 2017-12-27 | 2020-06-23 | 青岛海尔股份有限公司 | Refrigerator and defrosting control method thereof |
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| CN201440644U (en) * | 2009-06-10 | 2010-04-21 | 佛山市南庄广昌电器塑料有限公司 | Switching power supply for regularly defrosting |
| CH702709B1 (en) * | 2010-10-19 | 2011-08-31 | Lampen Sail Ltd | Cooling apparatus comprises evaporator-defrosting unit with auxiliary defrosting system for starting the melting process prior to final melting by an electromagnetic defrosting system |
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| CN108050767A (en) | 2018-05-18 |
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Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: Haier Zhijia Co.,Ltd. Patentee after: QINGDAO HAIER SPECIAL REFRIGERATION ELECTRIC APPLIANCE Co.,Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: Qingdao Haier Joint Stock Co.,Ltd. Patentee before: QINGDAO HAIER SPECIAL REFRIGERATION ELECTRIC APPLIANCE Co.,Ltd. |