CN112179014B - Refrigerating and freezing device and defrosting control method thereof - Google Patents

Refrigerating and freezing device and defrosting control method thereof Download PDF

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Publication number
CN112179014B
CN112179014B CN201910606112.4A CN201910606112A CN112179014B CN 112179014 B CN112179014 B CN 112179014B CN 201910606112 A CN201910606112 A CN 201910606112A CN 112179014 B CN112179014 B CN 112179014B
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China
Prior art keywords
external environment
dehumidification
temperature
humidity
defrosting
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CN201910606112.4A
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Chinese (zh)
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CN112179014A (en
Inventor
赵向辉
房雯雯
李靖
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Qingdao Haier Smart Technology R&D Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Smart Technology R&D Co Ltd
Haier Smart Home Co Ltd
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Priority to CN201910606112.4A priority Critical patent/CN112179014B/en
Publication of CN112179014A publication Critical patent/CN112179014A/en
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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
    • 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
    • F25D17/042—Air treating means within refrigerated spaces
    • 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
    • F25D21/008—Defroster control by timer
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/04—Treating air flowing to refrigeration compartments
    • F25D2317/041—Treating air flowing to refrigeration compartments by purification
    • F25D2317/0411—Treating air flowing to refrigeration compartments by purification by dehumidification
    • 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

Abstract

The invention relates to a refrigerating and freezing device and a defrosting control method thereof, wherein the refrigerating and freezing device comprises: the refrigerator comprises a refrigerator body, a storage compartment and a storage box, wherein the refrigerator body is internally limited with the storage compartment; one end of the airflow passage is communicated with the storage chamber, and the other end of the airflow passage is communicated with the external environment; the dehumidification module is used for condensing and dehumidifying the air flow flowing to the storage chamber through the air flow passage; and the heating device is used for promoting the frost formed by the dehumidification module to melt. The defrosting control method comprises the following steps: acquiring the external environment humidity and the external environment temperature of the external environment where the refrigeration and freezing device is located; determining a defrosting period of the dehumidification module according to the external environment humidity and the external environment temperature; and when the accumulated running time of the refrigeration and freezing device reaches a defrosting period after the compressor of the refrigeration and freezing device is started for the first time and the compressor is in a stop state, the heating device is controlled to be started so as to defrost the dehumidification module, the defrosting starting time of the dehumidification module is accurately controlled, and adverse effects caused by too early or too late starting of the heating device are avoided.

Description

Refrigerating and freezing device and defrosting control method thereof
Technical Field
The invention relates to a refrigeration and freezing technology, in particular to a refrigeration and freezing device and a defrosting control method thereof.
Background
Refrigerating and freezing devices, such as refrigerators, freezers, and refrigerated cabinets, are common electrical appliances used for storing various articles to be refrigerated or frozen, and are widely used in homes, supermarkets, and other various industries. After a certain period of use, a refrigerator-freezer can develop frost on its internal walls (especially in freezers, which produce a more pronounced amount of frost). One important reason for the formation of frost is that when the compressor is turned on or off, the pressure inside the refrigerating and freezing device changes, and the humid air from the external environment enters the refrigerating and freezing device through the door gap, and then the moisture in the humid air is condensed to form frost. The large amount of frost formation not only increases the amount of electricity used in the refrigeration and freezing apparatus, but also causes a poor experience when used by a user.
In the prior art, a common method for reducing the frosting amount is to open a hole on a box body of a refrigeration and freezing device, connect the hole with the outside through a vent pipe, add a drying agent in the vent pipe, and enable the ventilation volume of the vent pipe to be larger than that of a door gap. When the compressor works, the external air is dehumidified by the desiccant through the pre-installed vent pipe and then enters the refrigeration and freezing device, so that the purpose of defrosting is achieved. However, the method has the problems that the service life of the drying agent in the vent pipe is short, the drying agent needs to be replaced periodically, the operation difficulty is high, and the use cost of a user is increased; in addition, hot air is directly introduced into the refrigerating and freezing device, so that the energy consumption of the refrigerating and freezing device is increased.
For this reason, another method for reducing the amount of frost has been proposed in the prior art, in which an air flow path is provided in a refrigerating and freezing apparatus to communicate an external environment with a storage compartment, and a dehumidifying module is provided in the air flow path. When the compressor operates, the outside air enters the storage chamber after being dehumidified by the dehumidification module in the airflow passage, so that the purposes of relieving the pressure in the storage chamber and reducing the frosting amount are achieved. When the compressor is stopped, the heating device defrosts the dehumidifying module to recover the dehumidifying capacity. However, the start and stop of the heating device are simply controlled according to whether the compressor is operated or not, and the actual frosting condition of the dehumidification module is not considered at all. Therefore, the defrosting method of the dehumidification module in the prior art is very rough, and the situations that the defrosting of the dehumidification module is incomplete or the heating time of the heating device is too long, so that heat is transferred to the storage chamber and the like can exist.
Disclosure of Invention
An object of the first aspect of the present invention is to overcome at least one of the drawbacks of the prior art and to provide a defrosting control method of a refrigerating and freezing apparatus capable of precisely controlling a defrosting start time of a dehumidifying module.
It is a further object of the first aspect of the invention to avoid that the defrosting process of the dehumidifying module has an adverse effect on the storage compartment.
It is a further object of the first aspect of the invention to increase the dehumidification effect of the dehumidification module.
It is an object of a second aspect of the present invention to provide a refrigeration freezer apparatus capable of precisely controlling a defrosting start time of a dehumidifying module.
According to a first aspect of the present invention, there is provided a defrosting control method of a refrigerating and freezing apparatus, the refrigerating and freezing apparatus including:
a box body, wherein a storage compartment for storing articles is defined in the box body;
an air flow passage, one end of which is communicated with the storage chamber and the other end of which is communicated with the external environment so as to allow the air flow in the external environment to flow to the storage chamber;
the dehumidification module is used for condensing and dehumidifying the airflow flowing to the storage compartment through the airflow passage;
heating means for causing frost formed by the dehumidifying module to melt; and is
The defrosting control method comprises the following steps:
acquiring the external environment humidity and the external environment temperature of the external environment where the refrigerating and freezing device is located;
determining a defrosting period of the dehumidification module according to the external environment humidity and the external environment temperature; and
and when the accumulated running time of the refrigeration and freezing device after the compressor of the refrigeration and freezing device is started for the first time reaches the defrosting period and the compressor is in a stop state, controlling the heating device to start so as to defrost the dehumidification module.
Optionally, the defrosting control method further comprises:
and when the temperature around the dehumidification module reaches a preset temperature threshold value, stopping the heating device.
Optionally, the defrosting control method further comprises:
after the heating device is stopped, resetting the accumulated running time of the refrigerating and freezing device after the compressor is started for the first time to enter the next cycle period; wherein
In the next cycle, after the compressor is restarted, the external environment humidity and the external environment temperature of the external environment where the refrigerating and freezing device is located are obtained again, the defrosting cycle of the dehumidifying module is determined again according to the external environment humidity and the external environment temperature, and when the accumulated running time of the refrigerating and freezing device after the compressor is started at this time reaches the defrosting cycle and the compressor is in a stop state, the heating device is controlled to be started, so that the dehumidifying module is defrosted again.
Optionally, the defrosting cycle of the dehumidification module is determined as follows: and enabling the frosting amount of the dehumidifying module in the defrosting period to be less than or equal to the maximum frosting amount of the dehumidifying module at the external environment humidity and the external environment temperature.
Optionally, the operation of determining a defrosting cycle of the heating device according to the external ambient humidity and the external ambient temperature comprises:
searching a preset temperature and humidity duration comparison table to determine a humidity interval in which the external environment humidity is located and a temperature interval in which the external environment temperature is located, wherein the temperature and humidity duration comparison table comprises a plurality of humidity intervals and a plurality of temperature intervals, and each humidity interval and each temperature interval correspond to a corresponding duration value; and
and taking a time length value corresponding to the humidity interval where the external environment humidity is located and the temperature interval where the external environment temperature is located as a defrosting period of the heating device.
According to a second aspect of the present invention, there is also provided a refrigeration and freezing apparatus comprising:
a case defining a storage compartment therein for storing articles;
an air flow passage, one end of which is communicated with the storage chamber and the other end of which is communicated with the external environment so as to allow the air flow in the external environment to flow to the storage chamber;
the dehumidification module is used for condensing and dehumidifying the airflow flowing to the storage chamber through the airflow passage;
heating means for causing frost formed by the dehumidifying module to melt;
the humidity acquisition unit is used for acquiring the external environment humidity of the external environment where the refrigeration and freezing device is located;
a first temperature acquisition unit for acquiring an external environment temperature of an external environment where the refrigeration and freezing device is located;
and the control unit is used for determining the defrosting period of the dehumidifying module according to the external environment humidity and the external environment temperature, and controlling the heating device to start when the accumulated running time of the refrigerating and freezing device after the compressor of the refrigerating and freezing device is started for the first time reaches the defrosting period and the compressor is in a stop state, so as to defrost the dehumidifying module.
Optionally, the refrigeration and freezing apparatus further comprises:
a second temperature acquisition unit for acquiring a temperature around the dehumidification module; and is
The control unit is configured to control the heating device to stop when the temperature around the dehumidification module reaches a preset temperature threshold.
Optionally, the air flow path includes an air flow dehumidification pipe section connected to the dehumidification module, an air inlet pipe section connected between the air flow dehumidification pipe section and the external environment, and an air outlet pipe section connected between the air flow dehumidification pipe section and the storage chamber; wherein
The heating device is at least arranged on the outer wall of the tube body of the airflow dehumidification tube section, and the second temperature acquisition unit is arranged on the outer wall of the tube body of the airflow dehumidification tube section.
Optionally, the box includes inner bag, shell and forms the inner bag with the foaming heat preservation between the shell, the dehumidification module with the air current dehumidification pipeline section all sets up in the foaming heat preservation, just the dehumidification module includes:
the phase change energy storage unit is arranged on one side, opposite to the inner container, outside the pipe body of the airflow dehumidification pipe section and is in contact with the inner container so as to store cold energy from the inner container; and
and the fin component is arranged in the pipe body of the airflow dehumidification pipe section to absorb cold energy released by the at least one phase change energy storage unit in the phase change process, so that the airflow flowing through the airflow dehumidification pipe section is subjected to condensation and dehumidification.
Optionally, the outer wall of the pipe body of the airflow dehumidification pipe section comprises a forward surface and a reverse surface which are arranged oppositely, and two lateral surfaces connected between the forward surface and the reverse surface; wherein
The at least one phase change energy storage unit is arranged on the reverse surface, the heating device is arranged in other areas of the two lateral surfaces except for the area adjacent to the phase change energy storage unit and on the forward surface, and the second temperature acquisition unit is arranged in the area adjacent to the phase change energy storage unit of one of the lateral surfaces.
The inventors of the present application have further realized, on recognizing the drawbacks of the prior art, that to achieve an accurate control of the start-up time of the heating device, the actual amount of frost formation of the dehumidification module must be taken into account, which is directly related to the relative air humidity of the external environment, two of the important factors affecting the relative air humidity being the external ambient temperature and the external ambient humidity. Therefore, the present invention accurately determines the defrosting cycle of the dehumidification module according to the external ambient humidity and the external ambient temperature, thereby accurately calculating the amount of frost actually generated by the dehumidification module. When the accumulated running time of the refrigeration and freezing device after the compressor of the refrigeration and freezing device is started for the first time reaches the defrosting period and the compressor is in a shutdown state, the heating device is controlled to be started, the defrosting starting time of the dehumidification module is accurately controlled, and adverse effects caused by too early or too late starting of the heating device are avoided.
The inventor of the present application further recognizes that when the temperature around the dehumidification module reaches the preset temperature threshold, if the heating device continues to heat, the defrosting water may be further heated and evaporated into water vapor with higher temperature into the storage compartment due to the over-high temperature in the air flow passage, thereby affecting the dehumidification effect. Therefore, in the further defrosting control method of the present invention, the heating device is stopped when the temperature around the dehumidifying module reaches the preset temperature threshold, so as to avoid the above-mentioned adverse effect on the storage compartment caused by the defrosting process of the dehumidifying module.
Further, the defrosting cycle of the dehumidification module of the present application is determined such that the frosting amount of the dehumidification module within the defrosting cycle is less than or equal to the maximum frosting amount of the dehumidification module at the actual external ambient humidity and external ambient temperature. That is, when the heating means is activated, the amount of frost actually produced by the dehumidification module has not yet reached, or just reached, the maximum amount of frost it is capable of producing. Therefore, the moisture content in the airflow flowing through the dehumidification module can be prevented from exceeding the frosting capacity of the dehumidification module when the heating device is started. In other words, the defrosting cycle of the dehumidification module is specially designed, so that the dehumidification module can recover the dehumidification capacity in time, and the dehumidification and frost-condensation capacity is better all the time, and the dehumidification effect of the dehumidification module 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 example and not by way of 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 structural view of a refrigerating and freezing apparatus according to an embodiment of the present invention;
figure 2 is a schematic cross-sectional view of a refrigeration freezer apparatus according to one embodiment of the invention;
fig. 3 is a schematic flow chart of a defrosting control method of a refrigerating and freezing apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart diagram of a defrost control method according to a further embodiment of the present invention;
fig. 5 is a schematic block diagram of a refrigerating and freezing apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic block diagram of an airflow path, dehumidification module, and heating apparatus according to one embodiment of the present invention;
FIG. 7 is a schematic exploded view of an airflow dehumidification spool piece and a dehumidification module, in accordance with one embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of an airflow dehumidification spool piece and a dehumidification module, according to one embodiment of the present disclosure.
Detailed Description
The invention firstly provides a defrosting control method of a refrigerating and freezing device, which is applied to the refrigerating and freezing device with a special structure. The refrigerating and freezing device can be a common storage device with refrigerating and/or freezing functions, such as a refrigerator, an ice chest, a refrigerated cabinet and the like. In particular, the refrigerating and freezing device of the present invention is preferably a refrigerator having a single storage compartment with an access opening at the top.
Fig. 1 is a schematic configuration diagram of a refrigerating and freezing apparatus according to an embodiment of the present invention, and fig. 2 is a schematic sectional view of the refrigerating and freezing apparatus according to an embodiment of the present invention. Referring to fig. 1 and 2, the refrigerating and freezing device 1 of the present invention includes a cabinet 10, a storage compartment 11 for storing articles and a compressor compartment 12 for housing a compressor 70 are defined in the cabinet 10, and the compressor compartment 12 is in communication with the external environment. Typically, the compressor bin 12 is located at the bottom rear side within the tank 10. Further, the refrigerating and freezing device 1 further comprises a door (for example, when the refrigerating and freezing device 1 is a refrigerator) or a cover 90 (for example, when the refrigerating and freezing device 1 is a freezer or a refrigerator) for opening and/or closing the storage compartment 11.
Further, the refrigerating and freezing device 1 further includes an air flow path 20, a dehumidification module 30, and a heating device 40. The air flow path 20 has one end communicating with the storage compartment 11 and the other end communicating with the outside environment to allow the air flow in the outside environment to flow toward the storage compartment 11. The dehumidifying module 30 is used for condensing and dehumidifying the air flow flowing to the storage compartment 11 through the air flow passage 20. Specifically, when the compressor 70 is turned on, negative pressure is generated in the storage compartment 11. When the airflow sucked into the storage compartment 11 from the external environment passes through the airflow passage 20 due to the breathing effect, moisture in the airflow is condensed into water or frost by the dehumidification module 30 and removed, so that the airflow flowing to the storage compartment 11 is dry, thereby preventing a large amount of frost from being generated inside the refrigeration and freezing device 1 (especially the storage compartment 11) due to the introduction of high-humidity airflow, reducing the frost formation amount, and improving the use experience of users.
The heating device 40 is used to promote the frost formed by the dehumidifying module 30 to be melted. Specifically, the heating device 40 may be controlled to start when the compressor 70 is in a stopped state to promote the frost formed by the dehumidification module 30 to melt, so that the dehumidification module 30 has a good condensation and dehumidification function again. Specifically, the heating device 40 may be a heating wire, a heating pipe, or other suitable heating components. A water pan 80 for collecting condensed water is further disposed in the compressor bin 12, and the other end of the airflow passage 20 extends to the upper side of the water pan 80, so that condensed water generated by defrosting flows into the water pan 80, and inconvenience brought to users due to the fact that a condensed water containing structure is additionally disposed or the condensed water directly flows to the ground is avoided.
Specifically, the defrosting control method of the present invention comprises:
acquiring the external environment humidity and the external environment temperature of the external environment where the refrigeration and freezing device 1 is located;
determining a defrosting period of the dehumidifying module 30 according to the external environment humidity and the external environment temperature; and
when the accumulated running time of the refrigeration and freezing device 1 after the compressor 70 is started up for the first time reaches the defrosting period and the compressor 70 is in the shutdown state, the heating device 40 is controlled to be started up to defrost the dehumidification module 30.
Fig. 3 is a schematic flow chart of a defrosting control method of a refrigerating and freezing apparatus according to an embodiment of the present invention. Specifically, referring to fig. 3, in one embodiment, the defrosting control method of the present invention includes:
step S101, acquiring the external environment humidity and the external environment temperature of the external environment where the refrigeration and freezing device 1 is located;
step S102, determining the defrosting cycle of the dehumidifying module 30 according to the external environment humidity and the external environment temperature;
step S103, acquiring the accumulated running time of the refrigeration and freezing device 1 after the compressor 70 of the refrigeration and freezing device is started for the first time;
step S104, judging whether the accumulated running time of the refrigeration and freezing device 1 after the compressor 70 is started for the first time reaches a defrosting period; if yes, go to step S105; if not, go to step S103;
step S105, determining whether the compressor 70 is in a stopped state; if yes, go to step S106; if not, returning to the step S105 to continue judging;
and step S106, controlling the heating device 40 to start so as to defrost the dehumidification module 30.
It is to be noted that the operation of the compressor 70 is intermittent when the refrigerating and freezing apparatus 1 is operated. The cumulative operating time of the refrigeration and freezing apparatus 1 since the compressor 70 thereof is first started refers to the cumulative operating time of the refrigeration and freezing apparatus 1, which includes not only the cumulative operating time of the compressor 70 since the compressor is first started, but also the cumulative shutdown time of the compressor 70 since the compressor is first started.
The inventors of the present application have further realized, on recognizing the drawbacks of the prior art, that in order to achieve precise control of the activation time of the heating device 40, consideration must be given to the actual amount of frost formation of the dehumidification module 30, which is directly related to the relative humidity of the air of the external environment, two of the important factors affecting the relative humidity of the air being the external ambient temperature and the external ambient humidity. Accordingly, the present invention precisely determines the defrosting period of the dehumidifying module 30 according to the external ambient humidity and the external ambient temperature, thereby precisely calculating the amount of frost actually generated by the dehumidifying module 30. When the accumulated running time of the refrigeration and freezing device 1 after the compressor 70 is started for the first time reaches the defrosting period and the compressor 70 is in a stop state, the heating device 40 is controlled to be started, the defrosting starting time of the dehumidification module 30 is accurately controlled, and adverse effects caused by too early or too late starting of the heating device 40 are avoided. Specifically, if the heating device 40 is started too early, the actual frost formation amount of the dehumidification module 30 is too small or not, and it is not necessary to defrost the frost, heat is wasted and is transferred to the storage compartment, which may cause temperature fluctuation. On the other hand, if the heating device 40 is started too late, the dehumidification module 30 reaches the maximum frosting amount, which affects the dehumidification effect of the dehumidification module 30, and thus, a part of the outdoor air entering the storage compartment 11 is not dehumidified, which affects the defrosting effect of the storage compartment 11.
In some embodiments, the inventive defrosting control method further comprises: when the temperature around the dehumidification module 30 reaches a preset temperature threshold, the heating device 40 is stopped.
Fig. 4 is a schematic flow chart of a defrosting control method according to a further embodiment of the present invention. Specifically, in a specific embodiment, the defrosting control method of the present invention further comprises:
step S107, acquiring the temperature around the dehumidification module 30;
step S108, judging whether the temperature around the dehumidification module 30 reaches a preset temperature threshold value; if yes, go to step S109; if not, returning to the step S107 to continuously acquire the temperature around the dehumidification module 30;
in step S109, the heating device 40 is stopped.
The inventor of the present application further recognizes that when the temperature around the dehumidification module 30 reaches the preset temperature threshold, if the heating device 40 continues to heat, the defrosting water may be further heated and evaporated into water vapor with higher temperature into the storage compartment 11 due to the over-high temperature in the air flow path 20, thereby affecting the dehumidification effect. If the temperature around the dehumidification module 30 does not reach the preset temperature threshold, the heating device 40 is stopped, which may result in incomplete defrosting of the dehumidification module 30. Therefore, in the further defrosting control method of the present invention, the heating device 40 is stopped when the temperature around the dehumidifying module 30 reaches the preset temperature threshold, so as to avoid the above-mentioned adverse effect on the storage compartment 11 caused by the defrosting process of the dehumidifying module 30. Specifically, the preset temperature threshold may be a temperature value which is summarized according to practical experience, so that the defrosting of the dehumidification module 30 is thorough, and the temperature of the storage compartment 11 is not greatly affected, and the temperature value is preset in the refrigeration and freezing apparatus 1.
The inventor of the present application further recognized that when the compressor 70 is restarted and negative pressure is re-generated in the storage compartment 11, external air flows toward the storage compartment 11 through the air flow path 20 to balance the negative pressure. If the heating device 40 continues to heat, not only the heat generated by the heating device 40 will enter the storage compartment 11 along with the airflow to cause the temperature fluctuation in the storage compartment, but also the water vapor generated by evaporation due to heat absorption will enter the storage compartment 11 along with the airflow to cause the frosting amount in the storage compartment 11 to be more serious. Therefore, in the further defrosting control method of the present invention, the heating power of the heating device 40 is set such that the heating time of the heating device 40 is between the shutdown of the compressor 70 and the restart thereof, so as to avoid the above-mentioned adverse effect on the storage compartment 11.
In some embodiments, the defrosting control method of the present invention further comprises: after the heating device 40 is stopped, the refrigerating and freezing device 1 is cleared from the accumulated operating time after the compressor 70 is first turned on, so as to enter the next cycle. In the next cycle, after the compressor 70 is started again, the external environment humidity and the external environment temperature of the external environment where the refrigeration and freezing device 1 is located are obtained again, the defrosting cycle of the dehumidification module 30 is determined again according to the external environment humidity and the external environment temperature, and when the accumulated operation time of the refrigeration and freezing device 1 since the compressor 70 is started this time reaches the defrosting cycle and the compressor 70 is in the shutdown state, the heating device 40 is controlled to be started to defrost the dehumidification module 30 again. By such circulation, the dehumidification module 30 can be ensured to have better condensation and dehumidification capability all the time on the premise of not influencing the temperature of the storage compartment 11.
In some embodiments, the defrost cycle of dehumidification module 30 is determined as follows: the amount of frost formation of the dehumidification module 30 during the defrosting cycle is less than or equal to the maximum amount of frost formation of the dehumidification module 30 at the external ambient humidity and the external ambient temperature. That is, when the heating device 40 is activated, the amount of frost actually generated by the dehumidification module 30 has not yet reached or just reached the maximum amount of frost it can generate. Thus, it is avoided that the amount of moisture contained in the airflow passing through the dehumidification module 30 already exceeds the frosting capacity of the dehumidification module 30 when the heating device 40 is activated. In other words, the present application can make the dehumidifying module 30 recover its dehumidifying capability in time by specially designing the defrosting cycle of the dehumidifying module 30, and always have a better dehumidifying and frost-condensing capability, so as to improve the dehumidifying effect of the dehumidifying module 30.
In some embodiments, the heating power of heating device 40 is positively correlated to the amount of frost formation of dehumidification module 30. That is, the greater the amount of frost of the dehumidification module 30, the higher the power of the heating device 40, determined by other factors. The heating power of the heating device 40 can be adjusted according to the frosting amount of the dehumidifying module 30, so as to avoid that the dehumidifying module 30 cannot completely defrost due to too low power of the heating device 40 and heat is remained and enters the storage compartment 11 due to too high power of the heating device 40. Of course, the heating power of the heating device 40 is also related to the heating time period of the heating device 40, and the longer the heating time period of the heating device 40, the smaller the heating power of the heating device 40, under the determination of other factors.
In some embodiments, the minimum heating power of the heating device 40 is set such that the heating device 40 operates for a period of time from shutdown to restart of the compressor 70 to at least completely remove the frost formation of the dehumidification module 30. The length of time from shutdown to restart of the compressor 70 is the maximum time period during which the heating apparatus 40 can be heated, during which the heating apparatus 40 is powered down to minimize the amount of frost formed on the dehumidification module 30. Therefore, the minimum heating power of the heating device 40 is set such that the heating device 40 is capable of removing at least all frost from the dehumidification module 30 within the longest time period to ensure the completeness of defrosting of the dehumidification module 30.
In some embodiments, the operation of determining a defrosting cycle of the dehumidification module 30 according to the external ambient humidity and the external ambient temperature includes: and searching a preset temperature and humidity duration comparison table to determine a humidity interval in which the external environment humidity is located and a temperature interval in which the external environment temperature is located, wherein the temperature and humidity duration comparison table comprises a plurality of humidity intervals and a plurality of temperature intervals, and each humidity interval and each temperature interval correspond to a corresponding duration value. Then, the time length value corresponding to the humidity interval in which the external environment humidity is located and the temperature interval in which the external environment temperature is located is used as the defrosting cycle of the dehumidifying module 30.
Specifically, the first table is a temperature and humidity duration comparison table of a specific embodiment. In the table, N11、N12、N13、N14、N21、N22、N23、N24、N31、N32、N33、N34Are all constants. Referring to table one, the defrosting cycle of the dehumidification module 30 corresponding to each humidity interval and each temperature interval is a preset duration fixed value, and when the acquired external environment humidity is in the humidity intervals and the acquired external environment temperature is in the temperature intervals, the defrosting cycle can be directly determined according to the duration fixed values corresponding to the humidity intervals and the temperature intervals. It can be understood that, in the same temperature interval, the greater the external ambient humidity, the shorter the defrosting cycle of the dehumidification module 30; the smaller the external ambient humidity, the longer the defrosting cycle of the dehumidifying module 30. Specifically, in Table one, N11＜N21＜N31，N12＜N22＜N32，N13＜N23＜N33。
Table-temperature and humidity duration comparison table
Figure BDA0002120806030000091
In the temperature/humidity duration comparison table of other embodiments, the humidity interval and the temperature interval may also correspond to a corresponding duration calculation formula related to the external environment humidity and the external environment temperature, and a duration value calculated according to the duration calculation formula corresponding to the humidity interval and the temperature interval where the external environment humidity and the external environment temperature are respectively located is used as the defrosting period of the dehumidification module 30.
The invention also provides a refrigerating and freezing device 1, and fig. 5 is a schematic structural block diagram of the refrigerating and freezing device according to one embodiment of the invention. The refrigerating and freezing apparatus 1 includes a control unit 51, a humidity acquisition unit 53, and a first temperature acquisition unit 54, in addition to the above-mentioned cabinet 10, the air flow path 20, the dehumidification module 30, and the heating device 40. The humidity acquisition unit 53 is configured to acquire the external environment humidity of the external environment in which the refrigeration and freezing apparatus 1 is located, and send the external environment humidity to the control unit 51. The external ambient humidity acquired by the humidity acquisition unit 53 may be relative humidity. The first temperature acquisition unit 54 is configured to acquire an external environment temperature of an external environment in which the refrigeration and freezing apparatus 1 is located, and send the external environment temperature to the control unit 51. The control unit 51 is configured to determine a defrosting period of the dehumidification module 30 according to the external environment humidity and the external environment temperature, and control the heating device 40 to start when the accumulated running time of the refrigeration and freezing apparatus 1 after the compressor 70 is started for the first time reaches the defrosting period and the compressor 70 is in the shutdown state, so as to defrost the dehumidification module 30, accurately control a defrosting start time of the dehumidification module 30, and avoid adverse effects caused by too early or too late starting of the heating device 40. Specifically, the humidity obtaining unit 53 may be a humidity sensor disposed outside the refrigeration and freezing apparatus 1 or other devices capable of accurately obtaining the humidity of the external environment where the refrigeration and freezing apparatus 1 is located.
In some embodiments, the refrigerating and freezing apparatus 1 further includes a second temperature acquisition unit 52 for acquiring the temperature around the dehumidification module 30. Also, the control unit 51 is configured to control the heating device 40 to stop when the temperature around the dehumidification module 30 reaches a preset temperature threshold. Therefore, the bad influence of the defrosting process of the dehumidifying module 30 on the storage chamber 11 can be avoided. Specifically, the second temperature obtaining unit 52 may be a temperature sensor or other suitable device capable of obtaining the temperature around the dehumidification module 30.
In some embodiments, the control unit 51 is further configured to: after the heating device 40 is stopped, the cumulative operating time of the refrigeration and freezing apparatus 1 after the compressor 70 is started for the first time is cleared to enter the next cycle period. In the next cycle, after the compressor 70 is started again, the humidity obtaining unit 53 obtains the external environment humidity of the external environment of the refrigeration and freezing apparatus 1 again, the first temperature obtaining unit 54 obtains the external environment temperature of the external environment of the refrigeration and freezing apparatus 1 again, the control unit 51 determines the defrosting cycle of the dehumidification module 30 again according to the external environment humidity and the external environment temperature, and when the accumulated running time of the refrigeration and freezing apparatus 1 since the compressor 70 is started this time reaches the defrosting cycle and the compressor 70 is in the shutdown state, the heating apparatus 40 is controlled to be started to defrost the dehumidification module 30 again.
Fig. 6 is a schematic structural view of an air flow path, a dehumidification module, and a heating apparatus according to one embodiment of the present invention. Referring to fig. 6, the air flow path 20 may include an air flow dehumidification section 22 connected to the dehumidification module 30, an air inlet section 21 connected between the air flow dehumidification section 22 and the external environment, and an air outlet section 23 connected between the air flow dehumidification section 22 and the storage compartment 11. The heating device 40 is disposed at least on the outer wall of the air flow dehumidification section 22 to heat and defrost the dehumidification module 30. The second temperature obtaining unit 52 is disposed on the outer wall of the air flow dehumidification section 22, so as to detect the temperature around the dehumidification module 30.
Specifically, the air inlet pipe section 21, the air flow dehumidification pipe section 22 and the air outlet pipe section 23 are sequentially communicated, the air inlet pipe section 21 is communicated with the external environment, and the air outlet pipe section 23 is communicated with the storage compartment 11 to allow the air flow in the external environment to flow to the storage compartment 11 through the air flow passage 20. The joints between the air inlet pipe section 21 and the air flow dehumidifying pipe section 22, between the air flow dehumidifying pipe section 22 and the air outlet pipe section 23, and between the air outlet pipe section 23 and the storage chamber 11 are all sealed completely by adopting a sealing mechanism, so that the air flow in the air flow passage 20 is prevented from leaking outwards. The sealing structure may be, for example, a sealant, a gasket, and/or tape.
Further, the airflow channel 20 may extend vertically as a whole, and the air inlet pipe section 21, the air flow dehumidification pipe section 22 and the air outlet pipe section 23 are sequentially arranged from bottom to top, so that the external air flows from bottom to top to the top of the storage compartment 11, and the defrosting water generated by defrosting of the dehumidification module 30 is discharged along the airflow channel 20.
In some embodiments, the tank 10 includes an inner container 13, an outer container 14, and a foamed insulation layer (not shown) formed between the inner container 13 and the outer container 14. The dehumidification module 30 and the air flow dehumidification tubing section 22 are both disposed in the foamed insulation layer.
Fig. 7 is a schematic exploded structural view of an airflow dehumidification pipe section and a dehumidification module according to an embodiment of the present invention, and fig. 8 is a schematic cross-sectional view of an airflow dehumidification pipe section and a dehumidification module according to an embodiment of the present invention. Further, the dehumidification module 30 may include at least one phase change energy storage unit 31 and a fin assembly 32. The at least one phase change energy storage unit 31 is arranged on one side of the pipe body 221 of the airflow dehumidification pipe section 22, which is opposite to the inner container 13, and is in contact with the inner container 13 to store cold energy from the inner container 13. On one hand, the phase change energy storage unit 31 can directly absorb and store cold energy through the inner container 13, and the cold storage is more centralized and rapid; on the other hand, the phase change energy storage unit 31 can also absorb heat radiated or transferred from the outside to the inner container (the heat can be heat of air flow from the external environment or heat during defrosting), and the heat is prevented from being transferred to the storage compartment 11 through the inner container, so that temperature fluctuation of the storage compartment 11 and energy consumption increase caused thereby are avoided. The fin assembly 32 is disposed in the tube 221 of the airflow dehumidification tube section 22 to absorb cold energy released by the at least one phase change energy storage unit 31 during phase change, so as to condense and dehumidify the airflow flowing through the airflow dehumidification tube section 22.
It can be understood that each phase change energy storage unit 31 includes a phase change energy storage material, and the phase change energy storage material can absorb and store cold energy from the refrigeration device 1 during one phase change process thereof, and release the cold energy stored therein during the other phase change process thereof, and the released cold energy is used to promote moisture in the airflow circulating in the airflow dehumidification pipe section 22 to condense on the fin assembly 32, so as to achieve the purpose of dehumidifying the airflow. Because two phase change processes of the phase change energy storage material are continuously carried out, the air flow can be effectively condensed and dehumidified for a long time without periodic replacement, and therefore frosting is effectively and durably prevented. Meanwhile, the at least one phase change energy storage unit 31 is arranged outside the tube body 221, and the cold energy stored in each phase change energy storage unit 31 is transmitted to the fin assembly 32 in the tube body 221 through the tube body 221 of the airflow dehumidification tube section 22, so that the airflow inside the tube body 221 is condensed and dehumidified. It can be seen that the condensed water or frost produced by the air flow dehumidifying section 22 is located inside the pipe body 221. That is, the area where the phase change energy storage unit 31 is located and the frosting area are separated, and the high humidity air flow from the external environment does not contact with the phase change energy storage unit, so that the performance of the phase change energy storage unit can be effectively prevented from being affected by the generation of condensed water or frosting on the phase change energy storage unit. Specifically, if the phase change energy storage unit frosts, the transmission of the cold energy stored in the phase change energy storage unit to the outside is blocked, so that the dehumidification effect is influenced; when defrosting, the phase change energy storage unit can absorb part of heat to influence the defrosting effect.
Further, the heating device 40 is disposed in other regions of the outer wall of the tube 221 except for at least the region where the at least one phase change energy storage unit 31 is located. Therefore, the heat generated by the heating device 40 can be prevented from being directly transferred to the phase change energy storage unit 31, and further transferred to the inside of the refrigeration and freezing device 1 through the phase change energy storage unit 31 to cause temperature fluctuation or energy consumption increase of the storage compartment 11.
In some embodiments, the outer wall of the tube of airflow dehumidification section 22 includes oppositely disposed forward and reverse surfaces 2211 and 2212, and two lateral surfaces 2213 connected between forward and reverse surfaces 2211 and 2212. At least one phase change energy storage cell 31 is disposed at the opposite surface 2212, the heating device 40 is disposed in other regions of the two lateral surfaces 2213 than the region adjacent to the phase change energy storage cell 31 and on the forward surface 2211, and the second temperature acquisition unit 52 is disposed in the region adjacent to the phase change energy storage cell 31 of one of the lateral surfaces 2213.
To facilitate the arrangement of fin assembly 32, tube 221 of airflow dehumidification section 22 may include a body 221a and a cover 221b that are sealingly coupled together. The outer side surface of the cover 221b forms a forward surface 2211. Specifically, the main body 221a and the cover body 221b may be hermetically connected together by a sealant that is resistant to low temperature and waterproof; the main body 221a and the cover 221b may be sealingly coupled together by means of a screw and a sealing ring. The main body 221a and the cover body 221b together define a receiving cavity communicating with the inlet pipe section 21 and the outlet pipe section 23, in which the fin assembly 32 is disposed, and may be integrally formed with the main body 221 a. In order to ensure that the heat generated by the heating device 40 can be uniformly and efficiently transferred to the respective condensation fins 321 of the fin assembly 32, the width of the condensation fins 321 may be set to be approximately equal to the width of the main body 221a of the tube body 221, so as to ensure that each condensation fin 321 contacts the cover 221b of the tube body 221 after the main body 221a and the cover 221b are assembled together, so that the heat generated by the heating device 40 is uniformly and efficiently transferred to each condensation fin 321 through the cover 221 b.
Preferably, the heating device 40 may be disposed in other regions of the reverse surface 2212 besides the region where the at least one phase change energy storage unit 31 is located. For example, the at least one phase change energy storage cell 31 may be disposed in a middle region of the reverse surface 2212, and the heating device 40 may also be disposed in an upper region of the reverse surface 2212 above the middle region thereof and in a lower region below the middle region thereof. Therefore, the heating device 40 in the middle region of the front surface 2211, which is opposite to the at least one phase change energy storage unit 31, may be attached to the front surface 2211 in an S-shaped or U-shaped winding manner, and the heating devices 40 above and below the at least one phase change energy storage unit 31 may be spirally wound on the outer wall of the tube 221 of the air flow dehumidification section 22. Thus, the arrangement of the heating device 40 is not only simple and easy to operate, but also successfully avoids the phase change energy storage unit 31.
In some embodiments, the density of the heating devices 40 in each region of the outer wall of the tubes 221 of the airflow dehumidification section 22 is positively related to the amount of frost formation of the fin assemblies 32 in the corresponding region of the airflow dehumidification section 22. That is, the area of the fin assembly 32 where the larger the frost formation amount is, is more densely arranged with respect to the heating devices 40, so that the heat generated by the heating devices 40 can be matched with the frost formation amount actually generated by the fin assembly 32, and the uniformity and the thoroughness of the frost formation of the fin assembly 32 are improved on the premise of avoiding the excessive heat generation of the heating devices 40.
In some embodiments, the lowest portion of the air flow dehumidification section 22 connected to the air intake section 21 is provided with a drain 226 for draining the air intake section 21 of the condensed water generated by the fin assembly 32. The drain port 226 smoothly transitions with the inner wall 221c of the air flow dehumidifying section 22 to drain the condensed water more thoroughly, ensuring no residue. The heating device 40 is also disposed outside the section of the air inlet pipe section 21 connected to the air flow dehumidifying pipe section 22 to prevent the drain port 226 from being blocked by ice to affect the drainage of the condensed water.
In some embodiments, the heating device 40 is further disposed outside the end portion of the air outlet pipe section 23 connected to the storage compartment 11, so that water vapor generated during defrosting of the fin assembly 32 can be prevented from being blocked at the airflow inlet of the storage compartment 11 due to condensation and frosting, and therefore, the problem that dry airflow cannot be continuously introduced into the storage compartment 11 after the airflow inlet is blocked, and the frosting prevention function is affected is avoided. The heating device 40 between the end of the air outlet pipe section 23 connected with the storage chamber 11 and the air flow dehumidifying pipe section 22 is spirally wound on the outer wall of the air outlet pipe section 23 or attached to the outer wall of the air outlet pipe section 23. Since the section of the outlet pipe section 23 between its end connected to the storage compartment 11 and the air dehumidifying section 22 is less likely to produce frost, the heating device 40 outside the section can be wound around the section in a large spiral or directly attached to the outer wall of the section in a straight line.
It should be understood by those skilled in the art that, unless otherwise specified, terms used to indicate orientation or positional relationship in the embodiments of the present invention such as "upper", "lower", "inner", "outer", "lateral", "front", "rear", and the like are based on the actual use state of the refrigeration and freezing apparatus 1, and these terms are only used for convenience of description and understanding of the technical solutions of the present invention, and do not indicate or imply that the apparatus or components referred to must have a specific orientation, and therefore, should not be interpreted as limiting the present invention.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A defrosting control method of a cold storage freezer, the cold storage freezer comprising:
a case defining a storage compartment therein for storing articles;
an air flow passage, one end of which is communicated with the storage chamber and the other end of which is communicated with the external environment so as to allow the air flow in the external environment to flow to the storage chamber;
the dehumidification module is used for condensing and dehumidifying the airflow flowing to the storage compartment through the airflow passage;
the heating device is used for promoting frost generated by the dehumidification module to melt; wherein
The air flow passage comprises an air flow dehumidification pipe section connected with the dehumidification module, an air inlet pipe section connected between the air flow dehumidification pipe section and the external environment and an air outlet pipe section connected between the air flow dehumidification pipe section and the storage chamber;
the box body comprises an inner container, an outer shell and a foaming heat-insulating layer formed between the inner container and the outer shell, the dehumidification module and the airflow dehumidification pipe section are arranged in the foaming heat-insulating layer, and
the dehumidification module comprises at least one phase change energy storage unit, is arranged on one side, opposite to the inner container, outside the pipe body of the airflow dehumidification pipe section and is in contact with the inner container so as to store cold energy from the inner container;
the outer wall of the tube body of the airflow dehumidification tube section comprises a forward surface and a reverse surface which are oppositely arranged, and two lateral surfaces connected between the forward surface and the reverse surface; wherein
The at least one phase change energy storage unit is arranged on the reverse surface, and the heating device is arranged in other areas of the two lateral surfaces except for the area adjacent to the phase change energy storage unit and on the forward surface; and is
The defrosting control method comprises the following steps:
acquiring the external environment humidity and the external environment temperature of the external environment where the refrigeration and freezing device is located;
determining a defrosting period of the dehumidification module according to the external environment humidity and the external environment temperature; and
and when the accumulated running time of the refrigeration and freezing device after the compressor of the refrigeration and freezing device is started for the first time reaches the defrosting period and the compressor is in a stop state, controlling the heating device to start so as to defrost the dehumidification module.
2. The defrosting control method according to claim 1, further comprising:
and when the temperature around the dehumidification module reaches a preset temperature threshold value, stopping the heating device.
3. The defrosting control method according to claim 2, further comprising:
after the heating device is stopped, resetting the accumulated running time of the refrigerating and freezing device after the compressor is started for the first time to enter the next cycle period; wherein
In the next cycle, after the compressor is restarted, the external environment humidity and the external environment temperature of the external environment where the refrigerating and freezing device is located are obtained again, the defrosting cycle of the dehumidifying module is determined again according to the external environment humidity and the external environment temperature, and when the accumulated running time of the refrigerating and freezing device after the compressor is started at this time reaches the defrosting cycle and the compressor is in a stop state, the heating device is controlled to be started, so that the dehumidifying module is defrosted again.
4. The defrosting control method according to claim 1, wherein
The defrosting cycle of the dehumidification module is determined as follows: and enabling the frosting amount of the dehumidifying module in the defrosting period to be less than or equal to the maximum frosting amount of the dehumidifying module at the external environment humidity and the external environment temperature.
5. The defrosting control method according to claim 1, wherein
The operation of determining a defrosting cycle of the heating device according to the external ambient humidity and the external ambient temperature comprises:
searching a preset temperature and humidity duration comparison table to determine a humidity interval in which the external environment humidity is located and a temperature interval in which the external environment temperature is located, wherein the temperature and humidity duration comparison table comprises a plurality of humidity intervals and a plurality of temperature intervals, and each humidity interval and each temperature interval correspond to a corresponding duration value; and
and taking a time length value corresponding to the humidity interval where the external environment humidity is located and the temperature interval where the external environment temperature is located as a defrosting period of the heating device.
6. A refrigeration chiller comprising:
a case defining a storage compartment therein for storing articles;
an air flow passage, one end of which is communicated with the storage chamber and the other end of which is communicated with the external environment so as to allow the air flow in the external environment to flow to the storage chamber;
the dehumidification module is used for condensing and dehumidifying the airflow flowing to the storage compartment through the airflow passage;
heating means for causing frost formed by the dehumidifying module to melt;
the humidity acquisition unit is used for acquiring the external environment humidity of the external environment where the refrigeration and freezing device is located;
a first temperature acquisition unit for acquiring an external environment temperature of an external environment where the refrigeration and freezing device is located;
the control unit is used for determining a defrosting period of the dehumidifying module according to the external environment humidity and the external environment temperature, and controlling the heating device to start when the accumulated running time of the refrigerating and freezing device after the compressor of the refrigerating and freezing device is started for the first time reaches the defrosting period and the compressor is in a stop state so as to defrost the dehumidifying module;
the air flow passage comprises an air flow dehumidification pipe section connected with the dehumidification module, an air inlet pipe section connected between the air flow dehumidification pipe section and the external environment and an air outlet pipe section connected between the air flow dehumidification pipe section and the storage chamber;
the box body comprises an inner container, an outer shell and a foaming heat-insulating layer formed between the inner container and the outer shell, the dehumidification module and the airflow dehumidification pipe section are arranged in the foaming heat-insulating layer, and
the dehumidification module comprises at least one phase change energy storage unit, is arranged on one side, opposite to the inner container, outside the pipe body of the airflow dehumidification pipe section and is in contact with the inner container so as to store cold energy from the inner container;
the outer wall of the tube body of the airflow dehumidification tube section comprises a forward surface and a reverse surface which are oppositely arranged, and two lateral surfaces connected between the forward surface and the reverse surface; wherein
The at least one phase change energy storage unit is arranged on the reverse surface, and the heating device is arranged in other areas of the two lateral surfaces except for the area adjacent to the phase change energy storage unit and on the forward surface.
7. The refrigeration freezer of claim 6, further comprising:
a second temperature acquisition unit for acquiring a temperature around the dehumidification module; and is
The control unit is configured to control the heating device to stop when the temperature around the dehumidification module reaches a preset temperature threshold.
8. A refrigerator-freezer according to claim 7, wherein the freezer is a refrigerator-freezer
The second temperature acquisition unit is arranged on the outer wall of the pipe body of the airflow dehumidification pipe section.
9. Refrigeration and freezing apparatus according to claim 8, wherein
The dehumidification module further comprises:
and the fin component is arranged in the tube body of the airflow dehumidification tube section to absorb cold energy released by the at least one phase change energy storage unit in the phase change process, so that the airflow flowing through the airflow dehumidification tube section is subjected to condensation dehumidification.
10. A refrigerator freezer according to claim 9 wherein the freezer is arranged to cool air from the freezer
The second temperature acquisition unit is arranged in a region of one of the lateral surfaces adjacent to the phase change energy storage unit.
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CN104482716A (en) * 2014-12-31 2015-04-01 合肥美的电冰箱有限公司 Defrosting control method for refrigerator and refrigerator
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