CN113587539A - Defrosting control method and refrigerator - Google Patents

Defrosting control method and refrigerator Download PDF

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Publication number
CN113587539A
CN113587539A CN202110871935.7A CN202110871935A CN113587539A CN 113587539 A CN113587539 A CN 113587539A CN 202110871935 A CN202110871935 A CN 202110871935A CN 113587539 A CN113587539 A CN 113587539A
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Prior art keywords
chamber
temperature
refrigerating chamber
freezing
refrigerating
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CN202110871935.7A
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CN113587539B (en
Inventor
王伟
张雪颖
韩晓蕾
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Panasonic R&D Center Suzhou Co Ltd
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Panasonic R&D Center Suzhou Co Ltd
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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
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Defrosting Systems (AREA)

Abstract

The invention relates to the technical field of refrigerators, in particular to a defrosting control method applied to a refrigerator and the refrigerator. The invention provides a defrosting control method applied to a refrigerator, which comprises the following steps: step S1: starting a compressor for precooling, and keeping the temperature of an evaporator in an evaporation chamber below the temperature of a freezing chamber; step S2: after step S1 ends, the compressor is turned off, the heater is turned on, and the freezing chamber and the refrigerating chamber are simultaneously connected to the evaporating chamber. The defrosting control method provided by the invention improves the heating speed of the evaporating chamber by utilizing the high temperature of the freezing chamber and the refrigerating chamber relative to the evaporating chamber through the heat exchange of the evaporating chamber, the freezing chamber and the refrigerating chamber, thereby improving the overall defrosting efficiency of the refrigerator and reducing the defrosting energy consumption.

Description

Defrosting control method and refrigerator
Technical Field
The invention relates to the technical field of refrigerators, in particular to a defrosting control method applied to a refrigerator and the refrigerator.
Background
The refrigerator performs continuous refrigeration by continuously performing a cycle of compression-condensation-expansion-evaporation of a refrigerant in a refrigeration system. The surface temperature of the evaporator is far lower than the dew point temperature of air when the refrigeration system of the refrigerator normally operates, a large amount of moisture contained in food and air in the refrigerator can be separated out and condensed on the outer wall of the evaporator, and when the temperature of the outer wall of the evaporator is lower than 0 ℃, the moisture can be condensed into frost. In refrigeration systems, frost formation is difficult to avoid and is a result of normal operation of the refrigeration system, so the evaporator surfaces allow for a small amount of frost formation. However, as the refrigerator is used for a long time, a thick frost layer is accumulated on the surface of the evaporator, and the frost layer covers the surface of the evaporator to obstruct the heat conduction outside the evaporator, so that the heat cycle efficiency of the evaporator is affected, and the overall refrigeration efficiency of the refrigerator is seriously affected.
After the refrigerator is used for a period of time, the refrigerator is powered off, all food in the refrigerator is taken out, and then the refrigerator is waited for natural temperature rise or the interior of the refrigerator is heated for defrosting. However, the method is long in time consumption and complicated in operation, and the refrigerator after being heated needs to be cooled again, so that a large amount of energy consumption is generated.
In the prior art, the refrigerator with the defrosting mode can heat the evaporator through an internal heater so as to achieve the aim of defrosting. However, in the defrosting process, high-temperature gas is difficult to escape, the temperature of cold storages such as a refrigerating chamber and a freezing chamber is influenced, and even food in the freezing chamber is unfrozen. And when normal refrigeration work and defrosting earlier stage, the evaporimeter can maintain lower temperature usually for the heater can produce a large amount of energy consumptions at the heat-up work of defrosting earlier stage, and the intensification efficiency is lower.
Therefore, it is urgently needed to provide a technical scheme, which can effectively improve the defrosting efficiency of the refrigerator, reduce the defrosting energy consumption and simultaneously avoid influencing the temperature of the refrigeration house in the defrosting process.
Disclosure of Invention
In view of the above problems, the present invention provides a defrosting control method for a refrigerator, which can significantly improve the defrosting efficiency of the refrigerator by controlling the heat exchange process during defrosting, and simultaneously effectively reduce the defrosting energy consumption of the refrigerator.
The invention provides a defrosting control method of a refrigerator, which comprises the following steps:
step S1: starting a compressor for precooling, and keeping the temperature of an evaporator in an evaporation chamber below the temperature of a freezing chamber;
step S2: after step S1 ends, the compressor is turned off, the heater is turned on, and the freezing chamber and the refrigerating chamber are simultaneously connected to the evaporating chamber.
Firstly, the precooling process carries out high-intensity refrigeration, and the temperatures of the freezing chamber and the refrigerating chamber are reduced to a lower level relative to the normal refrigeration temperature, so that the temperatures of the freezing chamber and the refrigerating chamber can be kept within a temperature range in which food is not unfrozen or rotten even if the temperatures of the freezing chamber and the refrigerating chamber rise to some extent in the subsequent defrosting process. And the temperature of the evaporating chamber is kept below the temperature of the freezing chamber, and after the heater starts to work, the evaporating chamber is communicated with the freezing chamber and the refrigerating chamber, so that the evaporating chamber can be heated by effectively utilizing high-temperature air flows of the freezing chamber and the refrigerating chamber relative to the evaporating chamber, the heat exchange efficiency of the evaporating chamber is improved, the evaporating chamber is quickly heated, the defrosting time is shortened, and the remarkable energy-saving effect is achieved.
Preferably, in an embodiment of the present invention, the defrosting control method further includes:
step S3: and when the difference between the temperature of the freezing chamber and the temperature of the evaporator is smaller than a first preset value, disconnecting the first air flow passage between the freezing chamber and the evaporation chamber.
In the defrosting process, the temperature of the evaporating chamber is continuously raised under the action of the heater, and meanwhile, the evaporating chamber continuously exchanges heat with the freezing chamber and the refrigerating chamber. After the temperature of the evaporation chamber is close to that of the freezing chamber, the first air flow passage between the freezing chamber and the evaporation chamber is disconnected, so that the phenomenon that the temperature of the evaporation chamber is equal to or even higher than that of the freezing chamber, the evaporation chamber and the freezing chamber continuously carry out heat exchange, the temperature of the freezing chamber is continuously increased along with the temperature of the freezing chamber, and the normal freezing effect of the freezing chamber is influenced can be avoided.
Preferably, in an embodiment of the present invention, the defrosting control method further includes:
step S4: when the difference value between the temperature of the refrigerating chamber and the temperature of the evaporator is smaller than a second preset value, a second air flow passage between the refrigerating chamber and the evaporating chamber is cut off;
step S5: and when the temperature of the evaporator is greater than a third preset value, the heater is turned off.
Generally, the temperature of the freezing chamber in the refrigerator is far lower than that of the refrigerating chamber, and the temperature of the evaporating chamber is still far lower than that of the refrigerating chamber in a period of time after the first air flow path is cut off, so that the evaporating chamber and the refrigerating chamber can still keep gas heat exchange, and the temperature rise and the defrosting of the evaporating chamber are accelerated. Similarly, after the temperature of the evaporating chamber is continuously increased to be close to the temperature of the refrigerating chamber, the second airflow passage between the refrigerating chamber and the evaporating chamber is cut off, so that the phenomenon that when the temperature of the evaporating chamber is equal to or even higher than the temperature of the refrigerating chamber, heat exchange with the refrigerating chamber is continuously carried out, the temperature of the refrigerating chamber is increased accordingly, and the refrigeration of food materials in the refrigerating chamber is influenced can be avoided.
Further, in a preferred embodiment of the present invention, step S4 of the defrost control method further includes:
step S41, when the temperature of the evaporator is higher than a fourth preset value, a fan is started;
and step S42, disconnecting the second air flow path and closing the fan when the difference between the refrigerating chamber temperature and the evaporator temperature is less than a second preset value.
After step S3, the temperature of the evaporating chamber is slightly lower than the temperature of the freezing chamber, and after a period of heating, the temperature of the evaporating chamber is higher than the temperature of the freezing chamber but still lower than the temperature of the refrigerating chamber. And after the fourth preset value is reached, the fan is started, so that the movement speed of the airflow is accelerated, the heat exchange between the evaporation chamber and the refrigerating chamber is accelerated, and the defrosting speed of the evaporation chamber is further increased. Then, when the second gas flow path is cut off, the fan is turned off at the same time, thereby stopping the heat exchange between the evaporation chamber and the refrigerating chamber.
Preferably, in the technical solution of the present invention, step S4 may further include:
step S41, when the temperature of the evaporator is higher than a fourth preset value, a fan is started;
and step S43, when the difference between the evaporator temperature and the refrigerating chamber temperature is greater than a fifth preset value, disconnecting the second air flow passage and closing the fan.
Likewise, in the preferred embodiment, after the temperature of the evaporating chamber reaches the fourth preset value, the fan is turned on to perform efficient and sufficient heat exchange between the evaporating chamber and the refrigerating chamber. And, when the heat exchange is continued until the temperature of the evaporator is slightly higher than that of the refrigerating chamber, the heat exchange between the evaporator and the refrigerating chamber is interrupted. Therefore, air rich in water vapor in the evaporating chamber can enter the refrigerating chamber to increase the humidity in the refrigerating chamber, and the preservation environment of food materials in the refrigerating chamber is improved.
In the preferred technical scheme of the invention, in the step S1 of the defrosting control method, the evaporating chamber is kept at-32 to-30 ℃, and the freezing chamber is reduced to be 2 to 6 ℃ lower than the set temperature of the freezing chamber. The temperature of the freezing chamber is reduced to be 2-6 ℃ lower than the set temperature of the freezing chamber, so that in the subsequent defrosting process, the temperature of the freezing chamber can still be kept within the set working temperature range of the freezing chamber even if the temperature of the freezing chamber rises back to a certain degree. And the temperature of the evaporation chamber is between 32 ℃ below zero and 30 ℃ below zero and the freezing chamber still keep a certain temperature difference, so that after defrosting is started, the evaporation chamber and the freezing chamber can perform efficient heat exchange, the temperature of the evaporation chamber can be quickly kept equal to that of the freezing chamber, the defrosting time is shortened, and the defrosting energy consumption is reduced.
Preferably, when the defrosting operation is performed by using the defrosting control method provided in the technical scheme of the invention, the time for simultaneously connecting the freezing chamber and the refrigerating chamber with the evaporating chamber accounts for more than 10% of the duration of the total defrosting process. The connection of the freezing chamber, the refrigerating chamber and the evaporating chamber can greatly improve the temperature rise speed of the evaporator, effectively shorten the defrosting time and achieve the obvious energy-saving effect.
Further, in the technical solution of the present invention, in step S41 of the defrosting control method, the fourth preset value is-13 to-17 ℃. The fourth preset value is a temperature threshold for turning on the fan in order to accelerate the heat exchange between the evaporating chamber and the refrigerating chamber. Therefore, the temperature of-13 to-17 ℃ is used as a threshold value, so that the evaporator and the refrigerating chamber can be ensured to have a certain temperature difference to carry out sufficient heat exchange, and the phenomenon that the temperature of the evaporator is too low and the temperature difference between the evaporator and the refrigerating chamber is too large, so that the temperature of the refrigerating chamber is reduced to be below 0 ℃ and the fresh-keeping environment of the refrigerating chamber is damaged can be avoided.
Preferably, in the technical scheme of the invention, the first preset value, the second preset value and the fifth preset value of the on-off threshold of the airflow passage related to the defrosting control method are all 1-2 ℃. The heat exchange between the evaporation chamber and the freezing chamber is stopped when the temperature difference is reduced to 1-2 ℃, so that the continuous temperature rise of the evaporation chamber is avoided, and the temperature rise of the freezing chamber and the refrigerating chamber is also carried out. Similarly, the airflow passage is cut off in time, so that the temperature of the refrigerating chamber and the freezing chamber is prevented from being raised, and heat exchange with the evaporating chamber after the temperature of the evaporating chamber is higher than that of the refrigerating chamber and the freezing chamber can be prevented, and the temperature raising efficiency of the evaporating chamber is reduced.
In the technical solution of the present invention, there is also provided a refrigerator using the above-mentioned defrosting control method, including a refrigerating chamber, a freezing chamber and an air supply device, the air supply device including: a housing including at least one air inlet, a refrigerating chamber air outlet and a freezing chamber air outlet; the fan is arranged inside the shell; the refrigerating chamber baffle is arranged corresponding to the air outlet of the refrigerating chamber; the freezing chamber baffle is arranged corresponding to the air outlet of the freezing chamber; the driving part is arranged in the shell, is connected with the refrigerating chamber baffle and the freezing chamber baffle and can adjust the opening degree of the refrigerating chamber baffle and the opening degree of the freezing chamber baffle.
Drawings
Fig. 1 is a flowchart of a defrost control method according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a preferred defrost control method provided by the first embodiment of the present invention;
FIG. 3 is a flow chart of a further preferred defrost control method provided by the first embodiment of the present invention;
FIG. 4 is a flow chart of a defrost control method provided in a second embodiment of the present invention;
FIG. 5 is a flow chart of a preferred defrost control method provided by a second embodiment of the present invention;
fig. 6 is a schematic view of a refrigerator according to a third embodiment of the present invention;
fig. 7 is a schematic view of an air blowing device according to a third embodiment of the present invention;
fig. 8 is a flowchart of a damper control method according to a fourth embodiment of the present invention;
fig. 9 is a flow chart of a humidifying method in which a compressor operates according to a fourth embodiment of the present invention;
fig. 10 is a flowchart of a humidification method according to a fourth embodiment of the present invention when a compressor is stopped.
Reference numerals: 1-refrigerator, 2-refrigerating chamber, 3-freezing chamber, 4-air supply device, 41-shell, 42-air inlet, 43-freezing chamber air outlet, 431-freezing chamber baffle, 44-refrigerating chamber air outlet, 441-refrigerating chamber baffle, 45-fan and 46-driving part.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention, are within the scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
[ first embodiment ]
As shown in fig. 1, in a first embodiment of the present invention, there is provided a defrosting control method including the steps of:
step S1: starting a compressor for precooling, and keeping the temperature of an evaporator in an evaporation chamber below the temperature of a freezing chamber;
step S2: after step S1 ends, the compressor is turned off, the heater is turned on, and the freezing chamber and the refrigerating chamber are simultaneously connected to the evaporating chamber.
Among them, the refrigerator according to the embodiment of the present invention realizes a refrigeration system cycle of the refrigerator through a cycle of compression-condensation-expansion-evaporation of a refrigerant. Wherein the step of evaporating is a process in which the low-temperature and low-pressure refrigerant having passed through the expansion valve is vaporized by the evaporator absorbing heat in the refrigerator chamber. During absorption of thermal energy in the chamber, the evaporator surface may reach a lower temperature, causing moisture in the air to condense on the evaporator surface and condense as frost adhering to the evaporator surface as time goes on and the temperature goes down further.
In order to remove the frost layer condensed on the surface of the evaporator, a heater is required to heat the evaporation chamber, which is the space where the evaporator is located, so that the frost layer condensed on the surface of the evaporator is melted and peeled off. In the embodiment of the present invention, the heater may be a heating defroster of a refrigerator such as an aluminum foil heater, a defroster, etc., and is not limited herein.
In the defrosting control method provided by the embodiment, before defrosting, a pre-cooling process is firstly carried out, and a compressor is started to run at full load; the temperature E of the evaporating chamber is kept below the temperature D of the freezing chamber, for example, the temperature D of the freezing chamber is-21 ℃, the temperature E of the evaporating chamber is kept at-31 ℃, after the heater starts to work, the evaporating chamber is communicated with the freezing chamber and the refrigerating chamber, the high temperature of the freezing chamber and the refrigerating chamber relative to the evaporating chamber can be effectively utilized, the heat exchange efficiency of the evaporating chamber is improved, the evaporating chamber is quickly heated, the defrosting time is shortened, and the remarkable energy-saving effect is achieved. In addition, the temperature D of the freezing chamber and the temperature F of the refrigerating chamber can be reduced to a lower level relative to the normal refrigerating temperature in the pre-cooling process, for example, the set temperature of the freezing chamber is-17 ℃, and the temperature of the refrigerating chamber is reduced to-21 ℃ in the pre-cooling process, so that the temperature D of the freezing chamber and the temperature F of the refrigerating chamber can be increased back to some extent in the later defrosting process, and can also be kept in the temperature range of the normal refrigerating operation.
As shown in fig. 2, in the first embodiment of the present invention, preferably, the defrost control method further includes:
step S3: when the difference between the freezing chamber temperature D and the evaporator temperature E is less than a first preset value M1When the freezing chamber and the evaporating chamber are closed, the first air flow passage between the freezing chamber and the evaporating chamber is cut off.
At the beginning of defrosting, the evaporator temperature E is the lowest among the freezer temperature D, the evaporator temperature E, and the refrigerator temperature F due to the precooling process. The temperature E of the evaporating chamber is continuously raised by the action of the heater, and meanwhile, the evaporating chamber continuously exchanges heat with the freezing chamber and the refrigerating chamber. For example, at the beginning of defrosting, the freezing chamber temperature D is-21 ℃, the evaporating chamber temperature E is-31 ℃, the refrigerating chamber temperature F is 1 ℃, and as the evaporating chamber temperature E continuously rises, the difference between the freezing chamber temperature D and the evaporator temperature E becomes smaller and smaller. When the difference D-E is smaller than a first preset value M1When the temperature E of the evaporation chamber is quite close to the temperature D of the freezing chamber, the heat exchange between the freezing chamber and the evaporation chamber cannot effectively increase the temperature, and the first air flow path between the freezing chamber and the evaporation chamber is disconnected. Then, when the temperature E of the evaporation chamber continues to rise, so that the temperature E of the evaporation chamber is equal to or even higher than the temperature D of the freezing chamber, the first air flow passage which is disconnected at the moment can avoid the continuous heat exchange between the evaporation chamber and the freezing chamber, and the normal freezing effect of the freezing chamber is prevented from being influenced by the continuous rise of the temperature D of the freezing chamber along with the temperature E of the evaporation chamber.
In the process, the higher temperature of the freezing chamber relative to the evaporating chamber when the defrosting is started is utilized, the temperature rise of the evaporating chamber is accelerated, the defrosting time can be effectively shortened, and the remarkable energy-saving effect is achieved.
As shown in fig. 3, in the first embodiment of the present invention, it is further preferable that the defrosting control method further includes:
step S4: when the difference between the refrigerating chamber temperature F and the evaporating chamber temperature E is less than a second preset value M2When the air conditioner is used, a second air flow passage between the refrigerating chamber and the evaporating chamber is cut off;
step S5: when the temperature E of the evaporation chamber is more than a third preset value M3When so, the heater is turned off.
After the first air flow path is closed, the heat exchange between the evaporating chamber and the freezing chamber is stopped, and the evaporating chamber temperature E is kept constantly rising by the heater. For example, after the first airflow path is closed, the evaporating chamber temperature E is-23 ℃, the refrigerating chamber temperature F is 1 ℃, and similarly, the difference between the refrigerating chamber temperature F and the evaporator temperature E is continuously reduced. When the difference F-E is smaller than a second preset value M3When the temperature E of the evaporating chamber is quite close to the temperature F of the refrigerating chamber, the heat exchange between the refrigerating chamber and the evaporating chamber cannot effectively increase the temperature, and the second air flow passage between the refrigerating chamber and the evaporating chamber is cut off. Then, when the temperature E of the evaporating chamber continues to rise, so that the temperature E of the evaporating chamber is equal to or even higher than the temperature F of the refrigerating chamber, the second air flow passage which is disconnected at the moment can prevent the evaporating chamber and the refrigerating chamber from continuing to carry out heat exchange, and therefore the normal working temperature of the refrigerating chamber is prevented from being influenced by the fact that the temperature F of the refrigerating chamber continues to rise along with the temperature E of the evaporating chamber.
After the first air flow channel is closed, the temperature D of the freezing chamber in the refrigerator is far lower than the temperature F of the refrigerating chamber, and the temperature E of the evaporating chamber is still far lower than the temperature F of the refrigerating chamber in a period of time after the first air flow channel is disconnected, so that the evaporating chamber and the refrigerating chamber can still keep gas heat exchange, and the evaporating chamber is continuously accelerated to heat and defrost.
And finally, the first airflow passage and the second airflow passage are closed, the heat exchange space of the evaporator is limited in the evaporation chamber where the evaporator is located, the heat exchange efficiency can be effectively improved by reducing the heat exchange space, and the temperature rising speed of the evaporation chamber is increased. When the temperature E of the evaporation chamber is detected to be greater than a third set value M3I.e. the temperature is indicated to reach the standard of defrosting completion, the heater can be turned off, and the defrosting process is finished.
[ second embodiment ]
A second embodiment of the present invention is a further preferred embodiment of the first embodiment, and as shown in fig. 4, the defrosting control method provided in the embodiment further includes:
step S41, when the evaporator temperature E is greater than the fourth preset value M4When the fan is started, the fan is started;
and step S42, when the difference between the refrigerating compartment temperature F and the evaporator temperature E is less than a second preset value, disconnecting the second airflow path and turning off the fan.
After the first air flow passage is closed, the temperature E of the evaporator is close to the temperature D of the freezing chamber and has a larger difference with the temperature F of the refrigerating chamber, and after a period of heating, the temperature E of the evaporator is gradually increased and is closer to the temperature F of the refrigerating chamber. When the temperature E of the evaporator reaches a fourth preset value, the difference value between the temperature F of the refrigerating chamber and the temperature E of the evaporator is kept at a middle level, and the fan is started, so that the movement speed of the airflow is increased, the heat exchange between the evaporating chamber and the refrigerating chamber can be accelerated, and the defrosting speed of the evaporating chamber is further increased. The reason why the fan is not selected to be turned on immediately after the first air flow passage is closed is that the evaporator temperature E is close to the freezer temperature D and is too low, and if the fan is turned on immediately to perform rapid heat exchange, the temperature F of the refrigerating chamber may be rapidly decreased to destroy the refrigerating environment. The process of disconnecting the second gas flow path is the same as step S4 in the first embodiment, and will not be described herein.
As shown in fig. 5, in the present embodiment, preferably, the step S4 of the defrosting control method may further include:
step S41, when the evaporator temperature E is greater than the fourth preset value M4When the fan is started, the fan is started;
step S43, when the difference between the evaporator temperature E and the refrigerating chamber temperature F is greater than the fifth preset value M5When so, the second air flow passage is disconnected and the fan is turned off.
Similarly, step S41, namely the step of turning on the fan, is the same as the scheme in fig. 4, and is not repeated herein. After the fan is turned on, the evaporating chamber and the refrigerating chamber can make efficient and sufficient heat exchange, the temperature E of the evaporating chamber can be continuously raised when the fan is turned onThe difference value between the temperature E of the refrigerator and the temperature F of the refrigerating chamber is greater than a fifth preset value M5Namely, when the temperature E of the evaporator is slightly higher than the temperature F of the refrigerating chamber, the second air flow path is cut off. Thus, after the fan is turned on, the temperature in the evaporating chamber is slightly higher (greater than M)4) The air which is still lower than the temperature F of the refrigerating chamber can enter the refrigerating chamber and can fully exchange heat with the refrigerating chamber through the action of the fan, the air which is rich in water vapor in the evaporator can enter the refrigerating chamber more, so that the humidity in the refrigerating chamber is increased, the fresh-keeping environment of food materials in the refrigerating chamber is improved, and when the temperature E of the evaporator is slightly higher than the temperature F of the refrigerating chamber, the second air flow passage is cut off, so that the temperature of the air which enters the refrigerating chamber is not too high, and the low-temperature maintenance of the refrigerating chamber is not influenced.
It is worth mentioning that in order to keep the food materials in the refrigerating chamber fresh and avoid drying, the refrigerating chamber may still need to be kept in a high humidity state when the refrigerator operates in a steady state, and the combination of the steady state control and the defrosting and humidifying mode of the refrigerator can be realized.
In the embodiment of the present invention, in the step S1 of the defrosting control method, the refrigerator is pre-cooled, and the pre-cooling process reduces the freezing chamber temperature D to-21 ℃ if the evaporating chamber temperature E is preferably maintained at-32 to-30 ℃ and the freezing chamber temperature D is reduced to be 2 to 6 ℃ lower than the freezing chamber set temperature, for example, the freezing chamber set temperature is-17 ℃. When defrosting is started, the temperature E of the evaporation chamber is-32 to-30 ℃, a certain temperature difference is still kept between the evaporation chamber and the freezing chamber, and the evaporation chamber and the freezing chamber can keep high-efficiency heat exchange, so that the temperature E of the evaporation chamber can be quickly kept equal to the temperature D of the freezing chamber, the defrosting time is shortened, and the defrosting energy consumption is reduced. In the defrosting process, the temperature D of the freezing chamber inevitably rises back to a certain degree along with the rise of the temperature E of the evaporation chamber, but the pre-cooling reduced temperature enables the temperature D to be still kept within the set working temperature range of the freezing chamber, and the normal freezing operation of the freezing chamber cannot be influenced.
Preferably, in the embodiment of the present invention, the defrosting operation is performed in such a manner that the time for simultaneously connecting the freezing chamber and the refrigerating chamber with the evaporating chamber is 10% or more of the duration of the total defrosting process. The test experiment shows that the connection of the freezing chamber, the refrigerating chamber and the evaporating chamber can greatly improve the temperature rise speed of the evaporator, effectively shorten the defrosting time and achieve the remarkable energy-saving effect of more than 2%.
Further, in the embodiment of the present invention, in step S41 of the defrosting control method, the fourth preset value M4Is-13 to-17 ℃. Fourth preset value M4The temperature threshold of the fan is turned on in order to accelerate the heat exchange between the evaporating chamber and the refrigerating chamber. Therefore, the temperature of-13 to-17 ℃ is used as a threshold value, so that the evaporating chamber and the refrigerating chamber can be ensured to have certain temperature difference to carry out sufficient heat exchange, and the temperature E of the evaporating chamber is accelerated to rise; and the temperature E of the evaporation chamber can be prevented from being too low, and the temperature F of the refrigerating chamber is reduced to be below 0 ℃ by heat exchange, so that the fresh-keeping environment of the refrigerating chamber is damaged.
In the embodiment of the invention, the first preset value, the second preset value and the fifth preset value in the defrosting control method are on-off threshold values of the first air flow passage and the second air flow passage, and the preferred values are all 1-2 ℃. The heat exchange between the evaporating chamber and the refrigerating chamber is stopped when the temperature difference is reduced to 1-2 ℃, so that the continuous temperature rise of the evaporating chamber is avoided, and the refrigerating chamber are heated along with the temperature rise. Similarly, the first air flow passage and the second air flow passage are timely disconnected, so that the temperature of the freezing chamber and the refrigerating chamber is prevented from being increased, and meanwhile, the heat exchange between the evaporating chamber and the freezing chamber and the refrigerating chamber with lower temperature after the evaporating chamber is higher than the freezing chamber and the refrigerating chamber can be prevented, and the temperature increasing efficiency of the evaporating chamber is reduced.
[ third embodiment ]
As shown in fig. 6, in a third embodiment of the present invention, there is also provided a refrigerator 1 using the above-described defrosting control method, including a refrigerating chamber 2, a freezing chamber 3, and a blowing device 4. The air blowing device 4 is located between the freezing chambers 3, and includes: a housing 41 including at least one air inlet 42, a freezing chamber air outlet 43, and a refrigerating chamber air outlet 44; a fan 45 provided inside the casing 41; a freezing chamber baffle 431 provided corresponding to the freezing chamber air outlet 43; a refrigerating compartment baffle 441 disposed corresponding to the refrigerating compartment air outlet 44; and a driving unit 46 provided in the casing 41, connected to the freezing compartment shutter 431 and the refrigerating compartment shutter 441, and capable of adjusting the opening degrees of the freezing compartment shutter 431 and the refrigerating compartment shutter 441.
The freezing chamber baffle 431 and the freezing chamber air outlet 43 are correspondingly arranged in the first air flow path, when the freezing chamber baffle 431 is closed, the freezing chamber air outlet 43 is completely closed, and the first air flow path is disconnected; when the freezing chamber baffle 431 is opened, the freezing chamber air outlet 43 is opened, and the first air flow path is communicated. Similarly, the refrigerating compartment baffle 441 and the refrigerating compartment air outlet 44 are correspondingly arranged in the second air flow path, when the refrigerating compartment baffle 441 is closed, the refrigerating compartment air outlet 44 is completely closed, and the second air flow path is disconnected; when the refrigerating compartment shutter 441 is opened, the refrigerating compartment air outlet 44 is opened, and the second air flow path is communicated.
Further, in the embodiment of the present invention, the driving part 46 can drive the freezing chamber barrier 431 and the refrigerating chamber barrier 441 to be capable of adjusting the opening degrees thereof in a stepwise or stepless manner, thereby controlling the gas exchange rates in the first and second gas flow paths to achieve precise control of the temperature variation of each chamber when the refrigerator is operated.
[ fourth embodiment ]
A fourth embodiment of the present invention provides a damper control method applied to the blower device in the refrigerator provided in the third embodiment, which includes the following specific steps:
step S51: when the freezing chamber temperature D of the refrigerator is detected to be greater than or equal to a preset first opening temperature P1When the compressor is started, the freezing chamber begins to cool, and when the temperature F of the freezing chamber is greater than or equal to a preset first opening temperature Q1Calculating the opening rate of the baffle according to the external temperature, the set temperature of the refrigerating chamber and the revolution of the compressor, and opening the baffle of the refrigerating chamber;
step S52: after the baffle of the refrigerating chamber is opened, detecting the cooling speed of the refrigerating chamber, and adjusting the opening rate of the baffle according to the cooling speed;
step S53: when the temperature F of the refrigerating chamber is detected to be less than or equal to a preset first closing temperature Q2When the door is closed, the baffle of the refrigerating chamber is closed.
Further, in the barrier control method according to the present embodiment, step S51 further includes:
step S511, detecting the external temperature of the refrigerator, and calculating the external temperature opening rate according to the external temperature;
step S512, calculating the opening rate of the set value of the refrigerating chamber according to the set temperature of the refrigerating chamber;
step S513, calculating the opening rate of the revolution of the compressor according to the revolution of the compressor;
and step S514, integrating the opening rate of the external temperature, the opening rate of the set value of the refrigerating chamber and the opening rate of the number of revolutions of the compressor to calculate the opening rate of the baffle.
According to the baffle control method provided by the embodiment, the baffle opening rate is calculated according to the external temperature, the set temperature of the refrigerating chamber and the revolution number of the compressor, so that the most accurate baffle opening rate is obtained, and the gas exchange rate and the chamber temperature are accurately controlled; and the opening rate of the baffle is matched with the load of the refrigerating chamber, so that the temperature fluctuation amplitude of the refrigerating chamber can be reduced, the temperature rise of the freezing chamber is inhibited, and the overall system efficiency of the refrigerator is improved.
In a specific implementation process, firstly, calculating an external temperature opening rate according to the external temperature, wherein the higher the external temperature is, the larger the temperature difference between the inside and the outside of the refrigerator is, the larger an air outlet of a refrigerating chamber is required to be, and correspondingly, the external temperature opening rate is increased along with the increase of the external temperature; then, calculating a set value opening rate of the refrigerating chamber according to the set temperature of the refrigerating chamber, wherein the higher the set temperature of the refrigerating chamber is, the smaller the temperature difference between the target temperature and the external temperature is, the smaller the air outlet of the refrigerating chamber is required to be, and correspondingly, the set value opening rate of the refrigerating chamber is reduced along with the increase of the set temperature of the refrigerating chamber; then, calculating the opening rate of the revolution of the compressor according to the revolution of the compressor, wherein the higher the revolution of the compressor is, the faster the refrigeration efficiency is, and the smaller the air outlet of the refrigerating chamber is needed, and correspondingly, the opening rate of the revolution of the compressor is reduced along with the increase of the revolution of the compressor; finally, the three are added to obtain the opening rate of the baffle.
Preferably, in the damper control method according to the present embodiment, step S52 further includes:
step S521, when the cooling speed is greater than the preset upper limit of the cooling speed, reducing the opening rate of the baffle;
and step S522, when the cooling speed is less than the preset lower limit of the cooling speed, increasing the opening rate of the baffle.
The baffle aperture rate of reefer baffle not only can be set up according to a time point the real-time status of refrigerator before the baffle opened promptly, still can combine the temperature change rate of temperature regulation in-process to revise, has further realized the accurate control of temperature.
Further, the baffle control method provided in the present embodiment further includes:
step S501: when the freezing chamber temperature D of the refrigerator is detected to be greater than or equal to the preset second opening temperature P1When the air conditioner is started, the compressor and a freezing chamber baffle of the air supply device are started;
step S502: when the temperature E of the evaporation chamber is greater than or equal to the temperature D of the freezing chamber, closing the baffle of the freezing chamber;
step S503: when the difference value of the freezing chamber temperature D and the evaporating chamber temperature E is greater than or equal to a preset refrigeration value N, opening a freezing chamber baffle:
step S504: when the freezing chamber temperature D of the refrigerator is detected to be less than or equal to the preset second closing temperature P2At this time, the compressor and the freezing chamber shutter are closed.
When the refrigerating chamber and the freezing chamber are cooled simultaneously, the refrigerating chamber returns too much air, so that the temperature E of the evaporating chamber rises too high, and the temperature of the freezing chamber is reduced. In the present embodiment, when the evaporating chamber temperature E is equal to or higher than the freezing chamber temperature D, the freezing chamber baffle is closed, and the refrigerating chamber is cooled alone to prevent the freezing chamber from being excessively heated. And then, after the temperature of the evaporation chamber E is reduced to the temperature difference with the temperature D of the freezing chamber to exceed a preset refrigeration value N, judging that the cooling condition of the freezing chamber is mature, and then opening a baffle plate of the freezing chamber to cool the freezing chamber.
Preferably, the baffle control method of the present embodiment can realize accurate temperature control in a steady state operation state of the refrigerator, wherein the step of controlling the on/off of the airflow path by opening and closing the baffle is combined with the humidification step of the defrosting control method in the previous embodiment, so that a high humidity mode in the steady state operation state of the refrigerator can be realized.
First, as shown in fig. 9, during the steady state operation of the refrigerator, the high humidity mode is entered.
Step S61: when the freezing chamber temperature D of the refrigerator is detected to be greater than or equal to a preset first opening temperature P1When the temperature of the refrigerating chamber is reduced, the compressor is started, the fan is started, the baffle of the refrigerating chamber is closed, the baffle of the freezing chamber is opened, and the temperature of the freezing chamber is reduced;
step S62: detecting the external temperature and the cooling speed of the freezing chamber, calculating the revolution R of the compressor and the revolution VF of the fan, and continuously cooling the freezing chamber; when the freezing chamber temperature D of the refrigerator is detected to be less than or equal to the preset second closing temperature P2When the freezing chamber baffle is closed;
step S63: if the temperature F of the refrigerating chamber is greater than or equal to the preset first opening temperature Q1Opening a baffle of the refrigerating chamber, reducing the revolution R of the compressor and the revolution VF of the fan, and otherwise, closing the fan and the compressor;
step S64: when the temperature F of the refrigerating chamber is detected to be less than or equal to a preset first closing temperature Q2When the refrigerator is started, the baffle of the refrigerating chamber is closed; if the freezing chamber temperature D of the refrigerator is detected to be less than or equal to the preset first opening temperature P1When the fan and the compressor are turned off; otherwise, step S62 is executed.
In the humidification method, the freezing chamber is independently cooled; then, the freezing chamber reaches a preset second closing temperature P2After that, the freezer shutter is closed. At this time, if the refrigerating chamber temperature F is less than the first opening temperature Q1If yes, the pre-cooling step before humidification of the freezing chamber and the refrigerating chamber is completed is described, the fan and the compressor can be turned off, and then humidification is carried out; if the temperature F of the refrigerating chamber is greater than or equal to the preset first opening temperature Q1Opening a baffle of the refrigerating chamber, reducing the revolution R of the compressor and the revolution VF of the fan to match the load of the refrigerating chamber, simultaneously increasing the temperature E of the evaporator, preparing for cooling the refrigerating chamber for the next humidification, and reducing the temperature Q of the refrigerating chamber until the temperature F of the refrigerating chamber reaches a preset first closing temperature Q2And closing the baffle of the refrigerating chamber. If the temperature D of the freezing chamber of the refrigerator is detected to be less than or equal to a preset first openingStarting temperature P1When the pre-cooling is finished, the fan and the compressor can be turned off, and then the humidifying work is carried out; otherwise, step S62 is executed to cool the freezing compartment again.
Through foretell circulation cooling step, guarantee that freezer and walk-in all are under the temperature of predetermineeing, the precooling is all accomplished to freezer and walk-in promptly, can continue to carry out the humidification step:
as shown in fig. 10, the steps after the pre-cooling are as follows:
step S65, the compressor is closed, the heater is started, the baffle of the freezing chamber is closed, and the baffle of the cold storage chamber is opened;
step S66, when the evaporator temperature E is greater than the fourth preset value M4When the fan is started, the fan is started;
step S67, when the difference between the evaporator temperature E and the refrigerating chamber temperature F is greater than the fifth preset value M5When the fan and the refrigerating chamber baffle are closed;
step S68, when the evaporating chamber temperature E is greater than the sixth preset value M6When so, the heater is turned off.
Firstly, closing the freezing chamber after precooling is finished, and starting heat exchange between the refrigerating chamber and the evaporating chamber, so that air rich in water vapor due to temperature rise in the evaporating chamber enters the refrigerating chamber after the heater is started to humidify the refrigerating chamber; the temperature E of the evaporating chamber is usually at a lower level compared with the temperature F of the refrigerating chamber, and the temperature difference between the evaporating chamber and the refrigerating chamber is larger, so that the fan is not started at the moment, and the refrigerating chamber temperature F is prevented from being influenced by the temperature E of the evaporating chamber to be reduced too fast; when the evaporator temperature E is greater than the fourth preset value M4When the temperature E of the evaporation chamber is raised to a certain degree, the fan is started at the moment, so that the heat exchange of the air flow between the refrigerating chamber and the evaporation chamber is accelerated, more air rich in water vapor in the evaporation chamber enters the refrigerating chamber, and the humidifying effect of the refrigerating chamber is achieved; however, as the temperature E of the evaporating chamber continues to rise, after the temperature E of the evaporating chamber is slightly higher than the temperature F of the refrigerating chamber, the heat exchange between the air flow of the refrigerating chamber and the evaporating chamber needs to be stopped, that is, the fan and the baffle of the refrigerating chamber need to be closed, so as to prevent the temperature F of the refrigerating chamber from rising along with the temperature E of the evaporating chamber and damaging the temperature of the refrigerating environmentDegree; meanwhile, after the fan is turned on, the temperature E of the evaporating chamber rises to a sixth preset value M6When the temperature of the evaporator is higher than the first preset value M, the heater is turned off, and the temperature of the evaporator is stopped from rising6Thereby prolonging the humidifying time of the refrigerating chamber and improving the humidifying efficiency.
Reference throughout this specification to "an embodiment" means that a particular feature, step, function, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrase "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment of the invention. Furthermore, the particular features, steps, functions or characteristics may be combined in any suitable manner in one or more embodiments. For example, the first embodiment may be combined with the second embodiment as long as the two embodiments are not mutually exclusive.
So far, the technical solutions of the present invention have been described with reference to the accompanying drawings, but it is obvious to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A defrosting control method of a refrigerator is characterized by comprising the following steps:
step S1: starting a compressor for precooling, and keeping the temperature of an evaporator in an evaporation chamber below the temperature of a freezing chamber;
step S2: and (4) turning off the compressor after the step (S1) is finished, turning on the heater, and simultaneously connecting the freezing chamber and the refrigerating chamber with the evaporation chamber.
2. The defrost control method of claim 1, further comprising:
step S3: and when the difference between the temperature of the freezing chamber and the temperature of the evaporator is smaller than a first preset value, disconnecting a first air flow passage between the freezing chamber and the evaporation chamber.
3. The defrost control method of claim 2, further comprising:
step S4: when the difference value between the temperature of the refrigerating chamber and the temperature of the evaporator is smaller than a second preset value, a second air flow passage between the refrigerating chamber and the evaporating chamber is cut off;
step S5: and when the temperature of the evaporator is greater than a third preset value, turning off the heater.
4. The defrost control method of claim 3, said step S4 further comprising:
step S41, when the temperature of the evaporator is higher than a fourth preset value, a fan is started;
and step S42, when the difference between the refrigerating chamber temperature and the evaporator temperature is smaller than a second preset value, disconnecting the second air flow passage and closing the fan.
5. The defrost control method of claim 3, said step S4 further comprising:
step S41, when the evaporator temperature is higher than a fourth preset value, the fan is started;
and step S43, when the difference between the evaporator temperature and the refrigerating chamber temperature is greater than a fifth preset value, disconnecting the second air flow passage and closing the fan.
6. The defrost control method according to any one of claims 1 to 5, wherein in the step S1, the evaporation chamber is maintained at-32 to-30 ℃, and the freezing chamber is lowered to 2 to 6 ℃ lower than a freezing chamber set temperature.
7. The defrost control method of any one of claims 1-5, wherein the time for switching on the freezing chamber and the refrigerating chamber simultaneously with the evaporating chamber is more than 10% of the duration of the total defrost process.
8. Defrost control method according to any of the claims 1-5, characterized in that the fourth preset value is-13 to-17 ℃.
9. The defrost control method of any of claims 1-5, wherein the first predetermined value, the second predetermined value, and the fifth predetermined value are 1-2 ℃.
10. A refrigerator including a refrigerating compartment, a freezing compartment, and an air blowing device, wherein the refrigerator uses the defrost control method according to any one of claims 1 to 9, the air blowing device includes:
the shell comprises at least one air inlet, a refrigerating chamber air outlet and a freezing chamber air outlet;
the fan is arranged inside the shell;
the refrigerating chamber baffle is arranged corresponding to the air outlet of the refrigerating chamber;
the freezing chamber baffle is arranged corresponding to the air outlet of the freezing chamber;
the drive division, set up in inside the shell, with the walk-in baffle with the freezer baffle is connected, can adjust the walk-in baffle with the aperture of freezer baffle.
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