CN111609634A - Air-cooled refrigerator and defrosting control method thereof - Google Patents
Air-cooled refrigerator and defrosting control method thereof Download PDFInfo
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- CN111609634A CN111609634A CN201910143344.0A CN201910143344A CN111609634A CN 111609634 A CN111609634 A CN 111609634A CN 201910143344 A CN201910143344 A CN 201910143344A CN 111609634 A CN111609634 A CN 111609634A
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- air
- cooled refrigerator
- evaporator
- pressure difference
- defrosting
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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
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
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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
- F25D17/062—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 in household refrigerators
- F25D17/065—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 in household refrigerators with compartments at different temperatures
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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
- F25D17/067—Evaporator fan units
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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
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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
- F25D2600/00—Control issues
- F25D2600/02—Timing
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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
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
Abstract
The invention provides an air-cooled refrigerator and a defrosting control method thereof, which judge whether the air pressure difference of the air supply airflow is larger than a preset first air pressure difference threshold value or not according to the acquired air pressure difference of the air supply airflow of the air-cooled refrigerator before and after passing through an evaporator of the air-cooled refrigerator, judge whether a compressor meets a defrosting condition or not if the air pressure difference of the air supply airflow is larger than the first air pressure difference threshold value, and trigger the defrosting process of the air-cooled refrigerator if the compressor meets the defrosting condition. The method detects the pressure difference before and after the evaporator in real time, and judges whether the evaporator needs to be defrosted or not according to the pressure difference and the running time of the compressor. When the frosting degree of the surface of the evaporator is different, the pressure difference between the front and the back of the evaporator is different, so that whether the evaporator needs to be defrosted or not is judged together by the air pressure difference and the running time of the compressor, and the defrosting accuracy of the air-cooled refrigerator can be improved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an air-cooled refrigerator and a defrosting control method thereof.
Background
The air-cooled refrigerator refrigerates air flowing through an evaporator chamber through an evaporator in the evaporator chamber, and drives the air to flow through a fan to realize refrigeration. Although the air-cooled refrigerator has the advantages of high refrigerating speed and uniform temperature control, the problem of frosting of the evaporator is also brought, and because the temperature of the evaporator is low, water vapor in the air can form frost on the surface of the evaporator, so that the refrigerating effect of the refrigerator is influenced.
At present, the air-cooled refrigerator mainly starts a defrosting process according to the running time of a compressor, however, the defrosting mode has low accuracy and poor effect.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide an air-cooled 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 provide an air-cooled refrigerator having a highly accurate defrosting effect and a defrosting control method thereof.
A further object of the present invention is to improve the heat exchange efficiency of an air-cooled refrigerator.
The invention firstly provides a defrosting control method of an air-cooled refrigerator, which comprises the following steps: acquiring the air pressure difference of air flow of an air-cooled refrigerator before and after passing through an evaporator of the air-cooled refrigerator; judging whether the air pressure difference of the air supply airflow is greater than a preset first air pressure difference threshold value or not; if yes, judging whether the compressor meets a defrosting condition, and if the compressor meets the defrosting condition, triggering a defrosting process of the air-cooled refrigerator.
Optionally, the defrost condition comprises an operating time of the compressor exceeding a preset first time threshold.
Optionally, in a case where the operation time of the compressor is less than or equal to the first time threshold, the method further includes: and controlling a fan of the air-cooled refrigerator to run at a low-gear rotating speed.
Optionally, the step of controlling the fan of the air-cooled refrigerator to operate at a low gear speed further comprises: acquiring the air pressure difference of the air supply flow of the air-cooled refrigerator before and after passing through the evaporator again; judging whether the air pressure difference of the air supply airflow is greater than a preset second air pressure difference threshold value or not; if yes, triggering a defrosting process of the air-cooled refrigerator.
Optionally, the method further includes, in a case where the air pressure difference of the supply air flow is less than or equal to a second air pressure difference threshold: and controlling the fan to continuously run at a low gear speed.
Optionally, the method further includes, in a case where the air pressure difference of the supply air flow is less than or equal to the first air pressure difference threshold: and the air pressure difference of the air supply flow of the air-cooled refrigerator before and after passing through the evaporator is obtained again.
Optionally, wherein the defrost process comprises: the compressor is turned off and the defrost heater wire at the evaporator is turned on.
Optionally, the step of turning off the compressor and turning on the defrosting heating wire at the evaporator further comprises: acquiring the temperature of a storage space of the air-cooled refrigerator and the running time of a defrosting process; judging whether the temperature of the storage space of the air-cooled refrigerator is greater than a preset temperature threshold or the defrosting process running time is greater than a preset second time threshold or not; if so, controlling the air-cooled refrigerator to exit the defrosting process.
Optionally, the air-cooled refrigerator is a bottom evaporator air-cooled refrigerator.
According to another aspect of the present invention, there is also provided an air-cooled refrigerator including: the refrigeration system comprises a compressor, a fan and a bottom evaporator; and the controller comprises a memory and a processor, wherein a control program is stored in the memory, and the control program is used for realizing the defrosting control method of the air-cooled refrigerator according to any one of the above items when being executed by the processor.
The invention provides an air-cooled refrigerator and a defrosting control method thereof, which creatively provides a method for judging whether the air pressure difference of the air flow is larger than a preset first air pressure difference threshold value or not according to the obtained air pressure difference of the air flow of the air-cooled refrigerator before and after passing through an evaporator of the air-cooled refrigerator, judging whether a compressor meets a defrosting condition or not if the air pressure difference of the air flow is larger than the first air pressure difference threshold value, and triggering the defrosting process of the air-cooled refrigerator if the compressor meets the defrosting condition. The method can ensure the accuracy of the defrosting control method of the air-cooled refrigerator, detect the air pressure difference before and after the evaporator in real time, and judge whether the evaporator needs to be defrosted or not according to the air pressure difference and whether the compressor meets defrosting conditions or not. When the compressor meets the defrosting condition, the evaporator is not required to be defrosted, if the defrosting of the evaporator influences the refrigeration effect of the air-cooled refrigerator at the moment, and the frosting degrees of the surface of the evaporator are different, the air pressure difference between the front and the back of the evaporator is different, so that whether the evaporator needs to be defrosted or not is judged together through the air pressure difference and the running time of the compressor, and the defrosting accuracy of the air-cooled refrigerator can be improved.
Furthermore, the air-cooled refrigerator and the defrosting control method thereof control the rotating speed of the fan through the air pressure difference and the running time of the compressor together, so that the problem of fan frosting is solved, and the heat exchange efficiency is improved.
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 air-cooled refrigerator according to one embodiment of the present invention;
FIG. 2 is a side cross-sectional view of the bottom of an air-cooled refrigerator according to one embodiment of the present invention;
FIG. 3 is a schematic block diagram of an air-cooled refrigerator according to one embodiment of the present invention;
fig. 4 is a schematic view of a defrost control method of an air-cooled refrigerator according to an embodiment of the present invention;
fig. 5 is a flowchart of an implementation of a defrost control method of an air-cooled refrigerator according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic view of an air-cooled refrigerator 10 according to an embodiment of the present invention, fig. 2 is a side sectional view of a bottom of the air-cooled refrigerator 10 according to an embodiment of the present invention, and in the air-cooled refrigerator 10 shown in fig. 1, a door body and the like of the air-cooled refrigerator 10 are not shown in order to show an embodiment of the present invention.
The present embodiment provides an air-cooled refrigerator 10 in which an evaporator chamber 121 is located at the lower part of the inner side of a freezing inner container, the air-cooled refrigerator 10 generally comprises a box body 100, the box body 100 comprises an outer shell and a storage inner container arranged at the inner side of the outer shell, a storage space 110 is defined in the storage inner container, the storage inner container generally comprises the freezing inner container, a refrigerating inner container and the like, the freezing inner container is located below the refrigerating inner container, and the storage space 110 comprises a freezing chamber defined in the freezing inner container and a refrigerating chamber defined in the refrigerating inner container.
As can be appreciated by those skilled in the art, the air-cooled refrigerator 10 of the embodiment of the present invention may further include an evaporator 200, a blower fan 300, a compressor (not shown), a condenser (not shown), a throttling element (not shown), and the like. The evaporator 200 is connected to the compressor, the condenser, and the throttling element via refrigerant lines to form a refrigeration system that cools air flowing therethrough when the compressor is started.
In particular, in the present embodiment, the freezing inner container is located at the lower portion of the cabinet 100, the lower portion of the inner side thereof defines the evaporator chamber 121, the evaporator 200 is disposed in the evaporator chamber 121, the blower fan 300 is disposed in the evaporator chamber 121 and at the rear side of the evaporator 200, the storage inner container defines the storage space 110 above the evaporator chamber 121, and the blower fan 300 is configured to urge the cold airflow cooled by the evaporator 200 to flow toward the storage space 110.
The air-cooled refrigerator 10 provided in this embodiment may further include a temperature-changing chamber between the refrigerating chamber and the freezing chamber, as well known to those skilled in the art, wherein the temperature in the refrigerating chamber is generally between 2 ℃ and 10 ℃, preferably between 4 ℃ and 7 ℃. The temperature in the freezer compartment is typically in the range of-22 deg.C to-14 deg.C. The temperature-changing chamber can be adjusted to-18 ℃ to 8 ℃ at will. The optimum storage temperatures for different types of articles are different and the locations suitable for storage are different, for example, fruit and vegetable foods are suitable for storage in the cold room and meat foods are suitable for storage in the freezer room.
In some embodiments, the evaporator 200 is generally shaped as a flat cube and is disposed across the evaporator chamber 121, i.e., the long and wide sides of the evaporator 200 are parallel to the horizontal plane, the thickness side is disposed perpendicular to the horizontal plane, the evaporator 200 is generally parallel to the ground, and the thickness dimension is substantially less than the length dimension of the evaporator 200. By placing the evaporator 200 horizontally in the evaporator chamber 121, the evaporator 200 is prevented from occupying more space, and the storage capacity of the freezing chamber and the warming chamber in the upper part of the evaporator chamber 121 is secured.
The surface of the evaporator 200 of the air-cooled refrigerator 10 of the embodiment of the present invention is further provided with defrosting heater strips 210 for removing frost on the surface of the evaporator 200 to ensure that the air-cooled refrigerator 10 can perform normal refrigeration, and the bottom of the evaporator chamber 121 is further provided with a drain opening 122 for draining defrosting water out of the evaporator chamber 121.
The air-cooled refrigerator 10 further includes an air supply duct 120, the air supply duct 120 is connected to the rear of the evaporator 200, the air supply duct 120 extends vertically upward along the rear wall of the storage liner, and the air supply duct 120 has air supply outlets communicated with the storage spaces 110, so as to respectively deliver cold air flows, which have exchanged heat with the evaporator 200, to the storage spaces 110, so as to maintain the storage spaces 110 at corresponding temperatures.
The air-cooled refrigerator 10 further includes a cover plate covering the bottom of the freezing container to define an evaporator compartment 121 together with the rear wall and the bottom wall of the freezing container, and a return air opening 123 is formed at the upper front portion of the cover plate to allow the return air flow of the freezing compartment to flow into the evaporator compartment 121 through the return air opening 123 for re-cooling.
The return air flow flowing into the evaporator chamber 121 through the return air inlet 123 is subjected to heat exchange through the evaporator 200 and then circulates to the freezing chamber through the air supply duct 120, the air flow passes through the front end and the rear end of the evaporator 200 in the process, certain air pressure difference can be formed due to the shielding effect of the evaporator 200, when the surface of the evaporator 200 is frosted, the shielding effect on the air flow can be increased, so that the air pressure difference of the air flow passing through the front end and the rear end of the evaporator 200 is increased, and in the bottom-mounted evaporator air-cooled refrigerator, the front-rear distance of the evaporator 200 is large, and large pressure difference can be formed by the air flow passing through the front end and the rear end of the evaporator. Therefore, the method for judging the frosting degree of the evaporator 200 by the pressure difference between the front end and the rear end of the air flow passing through the evaporator 200 is more suitable for the bottom-mounted evaporator air-cooled refrigerator.
In addition, because the evaporator 200 is closer to the door body in the bottom-mounted evaporator air-cooled refrigerator, moisture can more easily enter the evaporator chamber 121 through the air return opening 123 in the door opening process, thereby increasing the frosting degree of the surface of the evaporator 200. For other types of air-cooled refrigerators 10, there is also frost on the surface of the evaporator 200, and therefore, in some other embodiments of the present invention, the air-cooled refrigerator 10 may be other air-cooled refrigerators 10 besides the bottom-mounted evaporator air-cooled refrigerator.
Fig. 3 is a schematic block diagram of the air-cooled refrigerator 10 according to an embodiment of the present invention, in which a temperature sensor 400 is further disposed in the storage space 110 of the air-cooled refrigerator 10 according to an embodiment of the present invention, for detecting a temperature of the storage space 110, a pressure difference sensor 500 is further disposed in the evaporator chamber 121, the pressure difference sensor 500 has a first probe 510 and a second probe 520, the first probe 510 and the second probe 520 are respectively used for detecting an upstream air pressure and a downstream air pressure of an air flow passing through the evaporator 200, and may be specifically mounted on surfaces of two ends of the evaporator 200 or air duct panels of two ends of the evaporator 200, and the pressure difference sensor 500 is used for detecting an air pressure difference K of the air flow passing through the evaporator 200 of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air.
The air-cooled refrigerator 10 according to an embodiment of the present invention further includes a controller 600, and the controller 600 includes a processor 620 and a memory 610, wherein the memory 610 stores a control program 611, and the control program 611 is executed by the processor 620 to implement a defrosting control method of the air-cooled refrigerator 10. The controller 600 may control the rotation speed of the fan 300 and the turning on or off of the defrosting heater wire 210.
The present embodiment also provides a defrosting control method of the air-cooled refrigerator 10, which can be executed by the controller 600 in the air-cooled refrigerator 10 of the above embodiment, and fig. 4 is a schematic diagram of the defrosting control method of the air-cooled refrigerator 10 according to an embodiment of the present invention. The defrosting control method of the air-cooled refrigerator 10 according to one embodiment of the present invention may generally include:
step S402: acquiring the air pressure difference K of the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10;
step S404: judging that the air pressure difference K of the air supply airflow is greater than a preset first air pressure difference threshold value K1, if so, executing step S406;
step S406: judging that the compressor meets the defrosting condition, if so, executing step S408;
step S408: and triggering the defrosting process of the air-cooled refrigerator 10.
In step S402, the air pressure difference K between the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10 can be obtained by the pressure difference sensor 500. When the frost formation degree of the surface of the evaporator 200 is different, the air pressure difference K between the front and the rear of the evaporator 200 is also different, so that the air pressure difference K between the front and the rear of the evaporator 200 of the air-cooled refrigerator 10 obtained by the pressure difference sensor 500 can accurately reflect the frost formation degree information of the surface of the evaporator 200.
In step S404, the first air pressure difference threshold k1 is a value preset in the air-cooled refrigerator 10, the first air pressure difference threshold k1 can be determined by actual tests on the air-cooled refrigerator 10, and the first air pressure difference threshold k1 can be any value between 10% and 50% of the air pressure loss of the blowing air before and after passing through the evaporator 200 of the air-cooled refrigerator 10, for example, 10%, 30%, 50%. In some embodiments of the present invention, if the determination result is negative, step S402 is executed again to obtain the air pressure difference K of the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10.
In step S406, the defrosting condition includes that the operation time of the compressor exceeds a preset first time threshold, where the operation time of the compressor is the operation time of the compressor that is away from the end of the last defrosting process, and the first time threshold is a value preset in the air-cooled refrigerator 10 and can be determined through an actual test on the air-cooled refrigerator 10. And if the running time of the compressor is greater than a preset first time threshold value, judging that the compressor meets the defrosting condition, otherwise, judging that the compressor does not meet the defrosting condition. In some embodiments of the present invention, the first time threshold may be taken to be 2 hours, 4 hours, etc. If the determination result is negative, the fan 300 is controlled to operate at a low-gear rotation speed, and the fan 300 is controlled to operate at the low-gear rotation speed, so that the fan 300 is prevented from sucking in outside air from the water outlet 122.
In an embodiment of the present invention, the fan 300 may have two different rotation speeds, and the fan 300 may operate at a low rotation speed if the determination result in step S406 is negative, and may switch the rotation speed of the fan 300 according to the cooling requirement of the user on the storage space 110 in other cases.
In step S408, the defrosting process includes: the compressor is turned off, the fan 300 stops operating, and the defrost heater 210 at the evaporator 200 is turned on, and the surface of the evaporator 200 is heated by the temperature of the defrost heater 210 to remove frost from the surface of the evaporator 200. In the defrosting process, the surface of the evaporator 200 may be heated by the defrosting heater 210 to defrost, or various other methods such as an infrared heating device may be used.
Fig. 5 is a flowchart of an implementation of the defrost control method of the air-cooled refrigerator 10 according to one embodiment of the present invention. As shown in fig. 5, the execution flow of the defrosting control method of the air-cooled refrigerator 10 according to the embodiment of the present invention may include:
step S502: the air pressure difference K of the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10 is obtained. In this step, the air pressure difference K of the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10 is obtained by the pressure difference sensor 500.
Step S504: and K > K1. Where K is the air pressure difference of the air flow before and after passing through the evaporator 200 of the air-cooled refrigerator 10, K1 is the preset first air pressure difference threshold, and if the determination result is no, the process returns to step S502. If yes, go to step S506. The air pressure difference K between the front and the rear of the evaporator 200 can reflect the frosting degree of the surface of the evaporator 200, the larger the air pressure difference K between the front and the rear of the evaporator 200 is, the more serious the frosting degree of the surface of the evaporator 200 is, wherein when K is less than or equal to K1, the frosting degree of the surface of the evaporator 200 is not serious, and the air-cooled refrigerator 10 can normally refrigerate; when K is greater than K1, it indicates that there is some frost on the surface of the evaporator 200, and at this time, step S506 needs to be executed to determine whether to enter the defrosting process, so as to avoid the influence of frequent defrosting on the cooling effect.
Step S506: and judging that the compressor meets the defrosting condition. If the determination result is negative, the process returns to step S508. If yes, go to step S514 to enter the defrosting process. The defrosting condition includes that the running time of the compressor exceeds a preset first time threshold, wherein the first time threshold is a value preset in the air-cooled refrigerator 10 and can be determined by actual tests on the air-cooled refrigerator 10, and the first time threshold can be set to any value between 60 minutes and 180 minutes, for example, 60 minutes, 120 minutes, 180 minutes and the like. And if the running time of the compressor is greater than a preset first time threshold value, judging that the compressor meets the defrosting condition, otherwise, judging that the compressor does not meet the defrosting condition.
Step S508: the fan 300 of the air-cooled refrigerator 10 is controlled to operate at a low gear speed. Since the surface of the evaporator 200 is already frosted to a certain extent, if the blower 300 is continuously operated at a higher rotation speed, the blower 300 will suck the external air into the evaporator chamber 121 from the drain 122, and the moisture of the external air will cause the blower 300 to be frosted, which will affect the cooling effect.
Step S510: the air pressure difference K of the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10 is obtained again. The accuracy of the defrosting control method can be ensured by acquiring the air pressure difference K of the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10 in real time.
Step S512: and K > K2. K2 is a preset second air pressure difference threshold, and the size of the second air pressure difference threshold k2 is the same as the first air pressure difference threshold k1 corresponding to the low-gear rotation speed of the fan 300. If the determination result is negative, the process returns to step S510, and the air pressure difference K between the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10 is obtained again. If yes, go to step S514.
In the embodiment of the present invention, the fan 300 may have two different rotation speeds, and the fan 300 operates at a low rotation speed if the determination result in step S506 is negative, and the rotation speed of the fan 300 may be switched according to the refrigeration requirement of the user on the storage space 110 in other cases. In other embodiments of the present invention, the fan 300 may have multiple different rotation speeds, and different first air pressure difference threshold values k1 and first time threshold values may be set for the multiple different rotation speeds of the fan 300, and when the determination result in S506 is negative, the fan is operated at the lowest gear rotation speed, and at this time, the magnitude of the second air pressure difference threshold value k2 is the same as the first air pressure difference threshold value k1 corresponding to the rotation speed of the lowest gear of the fan 300. In some special cases, the fan 300 is controlled to continue to operate at the lowest speed when the fan 300 operates at the lowest speed before step S508.
Step S514: the defrosting process of the air-cooled refrigerator 10 is triggered. Wherein, the defrosting process includes: the compressor is turned off, the fan 300 stops operating, and the defrost heater 210 at the evaporator 200 is turned on, and the surface of the evaporator 200 is heated by the temperature of the defrost heater 210 to remove frost from the surface of the evaporator 200.
Step S516: the temperature T of the storage space 110 of the air-cooled refrigerator 10 and the defrosting process operation time Y are obtained. The method for obtaining the temperature T of the storage space 110 of the air-cooled refrigerator 10 can be obtained by a temperature detector of the storage space 110.
Step S518: judging that T is greater than Tlimit or Y is greater than Ylimit. If the determination result is negative, the process returns to step S516. If yes, go to step S520. T is the temperature of the storage space 110, and can be obtained by the temperature sensor 400, Y is the operation time of the defrosting process, the second time threshold value Ylimit and the temperature threshold value Tlimit are preset and values in the air-cooled refrigerator 10, specifically, the Ylimit can be determined by experiments, or calculated by the power of the defrosting heating wire 210, and the like, the Ylimit can be any value between 5 and 30 minutes, such as 5 minutes, 10 minutes, 30 minutes, and the like, the Tlimit can be any value between 10 and 15 degrees celsius for the cold storage compartment, such as 10 degrees celsius, 15 degrees celsius, and the like, the Tlimit can be any value between-5 degrees celsius and 5 degrees celsius for the cold storage compartment, such as-5 degrees celsius, and the like, and those skilled in the art can flexibly configure the values of Tlimit and Ylimit according to actual conditions. The air-cooled refrigerator 10 has a plurality of storage spaces 110, each storage space 110 is correspondingly provided with a temperature threshold value Tlimit, and the temperature threshold values Tlimit of each storage space 110 may be the same or different, and when the temperature T of any storage space 110 is greater than the temperature Tlimit, the judgment result is yes, so as to ensure the fresh-keeping effect of all the storage spaces 110.
Step S520: and controlling the air-cooled refrigerator 10 to exit the defrosting process. The compressor and the fan 300 are normally operated according to the user's demand, and the defrosting heater 210 is stopped without reheating the surface of the evaporator 200.
After the step S520 is executed, the process returns to the step S502 again to obtain the air pressure difference K between the air flow of the air-cooled refrigerator 10 before and after passing through the evaporator 200 of the air-cooled refrigerator 10 again.
The invention provides an air-cooled refrigerator 10 and a defrosting control method thereof, which creatively provides a method for judging whether the air pressure difference K of the air supply airflow is larger than a preset first air pressure difference threshold value K1 according to the acquired air pressure difference K of the air supply airflow of the air-cooled refrigerator 10 before and after passing through an evaporator 200 of the air-cooled refrigerator 10, judging whether a compressor meets a defrosting condition if the air pressure difference K of the air supply airflow is larger than the first air pressure difference threshold value K1, and triggering the defrosting process of the air-cooled refrigerator 10 if the compressor meets the defrosting condition. The method can ensure the accuracy of the defrosting control method of the air-cooled refrigerator 10, detect the air pressure difference K in front of and behind the evaporator 200 in real time, and judge whether the evaporator 200 needs to be defrosted or not according to the air pressure difference K and the running time of the compressor. When the compressor meets the defrosting condition, it is not indicated that the evaporator 200 is frosted seriously, if the defrosting of the evaporator 200 at this time affects the refrigeration effect of the air-cooled refrigerator 10, and the frosting degree of the surface of the evaporator 200 is different, the air pressure difference K between the front and the rear of the evaporator 200 is different, so that whether the evaporator 200 needs to be defrosted or not is judged together by the air pressure difference K and the running time of the compressor, and the defrosting accuracy of the air-cooled refrigerator 10 can be improved.
Further, the air-cooled refrigerator 10 and the defrosting control method thereof of the present invention also control the rotation speed of the fan 300 through the air pressure difference K and the operation time of the compressor together, so as to improve the problem of frosting of the fan 300 and improve the heat exchange efficiency.
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 an air-cooled refrigerator comprises the following steps:
acquiring the air pressure difference of the air flow of the air-cooled refrigerator before and after passing through an evaporator of the air-cooled refrigerator;
judging whether the air pressure difference of the air supply airflow is greater than a preset first air pressure difference threshold value or not;
and if so, judging whether the compressor meets a defrosting condition, and if so, triggering a defrosting process of the air-cooled refrigerator.
2. The defrosting control method of an air-cooled refrigerator according to claim 1, wherein the defrosting control method of an air-cooled refrigerator includes
The defrost condition includes an operating time of the compressor exceeding a preset first time threshold.
3. The defrosting control method of an air-cooled refrigerator according to claim 2, wherein if the operating time of the compressor is less than or equal to the first time threshold, the method further comprises:
and controlling a fan of the air-cooled refrigerator to run at a low-gear rotating speed.
4. The defrosting control method of the air-cooled refrigerator according to claim 3, wherein the step of controlling the fan of the air-cooled refrigerator to operate at a low gear speed further comprises:
acquiring the air pressure difference of the air flow of the air-cooled refrigerator before and after passing through the evaporator;
judging whether the air pressure difference of the air supply airflow is greater than a preset second air pressure difference threshold value or not;
and if so, triggering the defrosting process of the air-cooled refrigerator.
5. The defrosting control method of an air-cooled refrigerator according to claim 4, wherein the air pressure difference of the supply air flow is less than or equal to the second air pressure difference threshold value, the method further comprises:
and controlling the fan to continuously run at a low gear speed.
6. The defrosting control method of an air-cooled refrigerator according to claim 1, wherein the condition that the air pressure difference of the supply air flow is less than or equal to the first air pressure difference threshold value further comprises:
and the air pressure difference of the air supply flow of the air-cooled refrigerator before and after passing through the evaporator is obtained again.
7. The defrosting control method of the air-cooled refrigerator according to claim 1, wherein the defrosting process includes:
and turning off the compressor, and turning on a defrosting heating wire at the evaporator.
8. The defrosting control method of the air-cooled refrigerator according to claim 7, wherein the step of turning off the compressor and turning on the defrosting heater wire at the evaporator further comprises:
acquiring the temperature of a storage space of the air-cooled refrigerator and the defrosting process operation time;
judging whether the temperature of the storage space of the air-cooled refrigerator is greater than a preset temperature threshold or the defrosting process running time is greater than a preset second time threshold or not;
and if so, controlling the air-cooled refrigerator to exit the defrosting process.
9. The defrosting control method of an air-cooled refrigerator according to claim 1, wherein the defrosting control method of an air-cooled refrigerator includes
The air-cooled refrigerator is an evaporator air-cooled refrigerator arranged at the bottom.
10. An air-cooled refrigerator comprising:
the refrigeration system comprises a compressor, a fan and a bottom evaporator;
a controller comprising a memory and a processor, the memory having stored therein a control program, the control program when executed by the processor being for implementing a defrost control method for an air-cooled refrigerator according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910143344.0A CN111609634A (en) | 2019-02-26 | 2019-02-26 | Air-cooled refrigerator and defrosting control method thereof |
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| CN201910143344.0A CN111609634A (en) | 2019-02-26 | 2019-02-26 | Air-cooled refrigerator and defrosting control method thereof |
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| CN112393476A (en) * | 2020-11-11 | 2021-02-23 | 珠海格力电器股份有限公司 | Defrosting control method of refrigerating unit and refrigerating unit |
| CN112556291A (en) * | 2020-12-29 | 2021-03-26 | 珠海格力电器股份有限公司 | Defrosting control method of air-cooled refrigerator and air-cooled refrigerator |
| CN114198967A (en) * | 2020-09-18 | 2022-03-18 | 合肥美的电冰箱有限公司 | Refrigerator compartment and refrigerator |
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