CN112665271A - Absolute constant-temperature special area of refrigerator and control method - Google Patents
Absolute constant-temperature special area of refrigerator and control method Download PDFInfo
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- CN112665271A CN112665271A CN202110055567.9A CN202110055567A CN112665271A CN 112665271 A CN112665271 A CN 112665271A CN 202110055567 A CN202110055567 A CN 202110055567A CN 112665271 A CN112665271 A CN 112665271A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007710 freezing Methods 0.000 claims abstract description 77
- 230000008014 freezing Effects 0.000 claims abstract description 57
- 238000005057 refrigeration Methods 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000009423 ventilation Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention discloses an absolute constant temperature special area of a refrigerator and a control method, and relates to the technical field of refrigerators. The invention comprises an air supply duct horizontally arranged at the joint between a refrigeration duct and a freezing duct and a constant temperature chamber arranged below the air supply duct; one end part of the air supply duct is provided with a cold storage air door and a freezing air door in parallel from top to bottom; the refrigerating air door is used for controlling the air quantity entering the air supply air channel from the refrigerating air channel; the freezing air door is used for controlling the air quantity entering the air supply air duct from the freezing air duct; the bottom wall of the air supply duct is fixedly inserted with a uniform cooling plate; the even cooling plate is provided with a plurality of ventilation holes; the ventilation hole is used for conveying the air quantity in the air supply duct to the constant-temperature room. The invention can realize no-load temperature fluctuation below +/-1.0 ℃ in a constant-temperature special area, and the temperature of the central point of food is +/-0.1 ℃, so that the invention meets the design requirement of absolute constant temperature and has higher market application value.
Description
Technical Field
The invention belongs to the technical field of refrigerators, and particularly relates to an absolute constant temperature special area of a refrigerator and a control method.
Background
At present, the special areas of the refrigerator in the prior art are more and more in function, and the refrigerator comprises a single-chamber special area, a dry-wet separate storage and zero-crystal constant fresh special area with a built-in bottom drawer for refrigeration, a microcrystal week fresh special area and the like. From the market reaction, the special refrigerating and internal bottom constant-temperature area is an important trend, but from the test and verification results of the actual special refrigerating and internal bottom area of the refrigerator carrier, if the temperature of the room temperature is about 0 ℃ on average, the no-load fluctuation exceeds more than +/-2.5 ℃, the fresh-keeping time is only 7 days, and the time is very short; if the no-load fluctuation of the special area exceeds more than +/-1.5 ℃, the compartment temperature is averagely about-1 ℃, the preservation time is only about 15 days, and the preservation time is also shorter; the preservation temperature designed by the similar special area is relatively single, and can only be applied in a certain range with small temperature fluctuation, and the actual use requirement of a user can not be better met. Therefore, it is desired to develop an absolute constant temperature zone and a control method of a refrigerator in order to solve the above problems.
Disclosure of Invention
The invention aims to provide an absolute constant temperature special area of a refrigerator and a control method, and aims to solve the problems in the background technology.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an absolute constant temperature special area of a refrigerator, which comprises an air supply duct horizontally arranged at the joint between a refrigeration duct and a freezing duct and a constant temperature chamber arranged below the air supply duct; one end part of the air supply duct is provided with a cold storage air door and a freezing air door in parallel from top to bottom; the refrigerating air door is used for controlling the air quantity entering the air supply air channel from the refrigerating air channel; the freezing air door is used for controlling the air quantity entering the air supply air channel from the freezing air channel; a horizontally arranged uniform cooling plate is fixedly inserted into the bottom wall of the air supply duct; the even cooling plate is provided with a plurality of ventilation holes; the ventilation hole is used for conveying the air quantity in the air supply duct to the constant-temperature chamber; one side of the even cooling plate, which is far away from the cold storage air door or the freezing air door, is provided with a turbulent flow fan; the turbulent fan is fixedly inserted on the bottom wall of the air supply duct in a penetrating way; the turbulent fan is used for refluxing the air quantity in the constant-temperature room to the air supply duct; the bottom wall of the constant-temperature chamber is provided with an air outlet; a drawer with an open upper part is arranged in the constant temperature chamber in a sliding way; a first air conveying gap is formed between each two opposite side walls of the drawer and each two opposite side walls of the constant-temperature chamber, and a second air conveying gap is formed between the bottom wall of the drawer and the bottom wall of the constant-temperature chamber; a plurality of air conveying openings are formed in the two opposite side walls of the drawer side by side; the air delivery port is arranged at the bottom of the drawer; the air delivery opening is used for delivering the air quantity in the drawer to the air outlet through the first air delivery gap and the second air delivery gap.
Further, a heat preservation layer is horizontally arranged above the uniform cooling plate; the heat preservation is installed on the roof in air feed wind channel.
Furthermore, a temperature sensor is arranged on one side of the even cooling plate close to the cold storage air door or the freezing air door; the temperature sensor is fixed on the bottom wall of the air supply duct; the temperature sensor is used for detecting the temperature in the constant temperature chamber.
Further, the even cooling plate is made of a metal material; the cold evening plate comprises a first flat plate and a second flat plate which are arranged in parallel; the first flat plate and the second flat plate are connected through a coaming in a frame structure; a plurality of connecting sleeves for forming the vent holes are fixedly inserted between the first flat plate and the second flat plate; a cavity structure is formed among the first flat plate, the second flat plate, the enclosing plate and the connecting sleeve; the cavity structure is filled with a coolant.
Further, a first-speed cooling tray is horizontally placed on the bottom wall of the drawer.
A control method for an absolute constant temperature special area of a refrigerator comprises the following steps:
step one, setting a temperature value in a constant temperature chamber; when the temperature of the constant temperature chamber is set to be higher than the micro-freezing temperature range, executing the second step; when the temperature value of the constant temperature chamber is set to be in a micro-freezing temperature zone or a sub-freezing temperature zone or a freezing temperature zone, executing the third step;
opening a refrigeration air door, enabling the air quantity in the refrigeration air channel to enter the drawer through the air supply air channel and the cold equalizing plate, then enabling the air quantity to flow back to the air outlet through the air conveying opening, the first air conveying gap and the second air conveying gap, and finally returning to the refrigeration evaporator cabin, so that refrigeration cycle is realized;
step three, opening a freezing air door, enabling the air quantity in the freezing air channel to enter the drawer through the air supply air channel and the cold equalizing plate, then enabling the air quantity to flow back to the air outlet through the air conveying opening, the first air conveying gap and the second air conveying gap, and finally returning to the refrigerating evaporator cabin, so that the refrigerating cycle is realized;
step four, after the constant-temperature chamber reaches a stop point, the refrigerating air door and the freezing air door are both in a closed state, and then the turbulent flow fan is started until the constant-temperature chamber makes a refrigerating request again, and the step two or three is executed;
monitoring the temperature in the constant-temperature chamber in real time through a temperature sensor, and when the temperature set value of the constant-temperature chamber is higher than the micro-freezing temperature interval and the temperature value in the constant-temperature chamber is higher than the temperature, executing the step three firstly until the constant-temperature chamber reaches a shutdown point and then stopping refrigeration; and repeating the step two when the constant-temperature chamber requires refrigeration again, and stopping refrigeration when the constant-temperature chamber reaches the stop point.
Further, when the temperature set value in the constant temperature room is increased to be higher than the micro freezing temperature zone or the sub freezing temperature zone or the freezing temperature zone from the micro freezing temperature zone or the sub freezing temperature zone or the freezing temperature zone, the second step is executed until the temperature in the constant temperature room reaches the set requirement, and then the refrigeration is stopped.
Furthermore, the set value of the starting point temperature of the constant-temperature chamber is Ton＝TSet temperature+0.5, setpoint for shutdown temperature Toff＝Ton-1。
The invention has the following beneficial effects:
1. the invention can realize no-load temperature fluctuation in the constant-temperature compartment below +/-1.0 ℃, the compartment temperature can be in a cold storage section, a micro-freezing section, a sub-freezing section and a freezing section, the micro-freezing preservation time is realized for more than 30 days, the preservation time meets the longest design requirement of the industry, meanwhile, the invention also solves the problems of simplification of the built-in constant-temperature special area of the current air-cooled refrigerator and the like, and has higher market application value.
2. The no-load temperature fluctuation of the constant-temperature chamber is less than +/-1.0 ℃, the temperature of the central point of the food is +/-0.1 ℃, and the design requirement of absolute constant temperature can be met; meanwhile, a turbulent flow fan is arranged in the constant-temperature chamber, and when the constant-temperature chamber stops refrigerating, the turbulent flow effect of the turbulent flow fan is utilized, so that the temperature uniformity in the constant-temperature chamber can be better, the defect of high temperature and low temperature after the current shutdown is overcome, and the requirement that the constant-temperature chamber can realize constant-temperature design in the refrigerating and shutdown processes is met.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of an absolute constant temperature zone of a refrigerator according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
a-a refrigerating air duct, B-a freezing air duct, 1-an air supply air duct, 2-a constant temperature chamber, 3-a cold homogenizing plate, 4-a turbulent flow fan, 5-a drawer, 6-a heat insulation layer, 7-a temperature sensor, 8-a quick cooling tray, 101-a refrigerating air door, 102-a freezing air door, 201-an air outlet and 501-an air conveying opening.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention relates to an absolute constant temperature special area of a refrigerator, which includes an air supply duct 1 horizontally installed at a connection between a refrigerating duct a and a freezing duct B, and a constant temperature chamber 2 installed below the air supply duct 1; one end part of the air supply duct 1 is provided with a cold storage air door 101 and a freezing air door 102 in parallel from top to bottom; the refrigeration damper 101 and the freezer damper 102 are conventional automatic dampers in the art; the refrigerating air door 101 is used for controlling the air quantity entering the air supply air duct 1 from the refrigerating air duct A; the freezing air door 102 is used for controlling the air quantity entering the air supply air duct 1 from the freezing air duct B;
a horizontally arranged uniform cooling plate 3 is fixedly inserted into the bottom wall of the air supply duct 1; a heat preservation layer 6 is horizontally arranged above the even cooling plate 3; the heat preservation layer 6 is arranged on the top wall of the air supply duct 1; the heat-insulating layer 6 is a foam plate or a sponge plate; the even cooling plate 3 is provided with a plurality of ventilation holes; the ventilation hole is used for conveying the air quantity in the air supply duct 1 into the constant-temperature chamber 2; a turbulent fan 4 is arranged on one side of the even cooling plate 3, which is far away from the cold storage air door 101 or the freezing air door 102; the turbulent fan 4 is fixedly inserted on the bottom wall of the air supply duct 1; the turbulent fan 4 is used for refluxing the air quantity in the constant-temperature chamber 2 to the air supply duct 1;
the bottom wall of the constant-temperature chamber 2 is provided with an air outlet 201; a drawer 5 with an upper part of an open structure is arranged in the constant temperature chamber 2 in a sliding way, and an open structure for the movement of the drawer 5 is arranged at one end of the constant temperature chamber 2 far away from the refrigerating air duct A or the freezing air duct B; a quick cooling tray 8 is horizontally arranged on the bottom wall of the drawer 5; first air conveying gaps are formed between two opposite side walls of the drawer 5 and two opposite side walls of the constant-temperature chamber 2, and a second air conveying gap is formed between the bottom wall of the drawer 5 and the bottom wall of the constant-temperature chamber 2; a plurality of air conveying openings 501 are formed in parallel on two opposite side walls of the drawer 5; the air delivery opening 501 is arranged at the bottom of the drawer 5; the air delivery opening 501 is used for delivering the air volume in the drawer 5 to the air outlet 201 through the first air delivery gap and the second air delivery gap.
Wherein, one side of the even cooling plate 3 close to the cold storage air door 101 or the freezing air door 102 is provided with a temperature sensor 7; the temperature sensor 7 is a conventional element in the art; the temperature sensor 7 is fixed on the bottom wall of the air supply duct 1; the temperature sensor 7 is used for detecting the temperature in the thermostatic chamber 2.
Wherein, the even cooling plate 3 is made of metal material, such as metal copper; the cold homogenizing plate 3 comprises a first flat plate and a second flat plate which are arranged in parallel; the first flat plate is connected with the second flat plate through a coaming in a frame structure; a plurality of connecting sleeves for forming the vent holes are fixedly inserted between the first flat plate and the second flat plate; a cavity structure is formed among the first flat plate, the second flat plate, the enclosing plate and the connecting sleeve; the cavity structure is filled with a coolant; the cold-storage agent adopts the conventional cold-storage material in the field.
A control method for an absolute constant temperature special area of a refrigerator comprises the following steps:
step one, setting a temperature value in a constant temperature chamber 2; when the temperature of the constant temperature chamber 2 is set to be higher than the micro-freezing temperature range, executing a second step, wherein the micro-freezing set temperature is-3.5 ℃, and the micro-freezing temperature range is-4 ℃ to-3 ℃; when the temperature value of the constant temperature chamber 2 is set to be in a micro-freezing temperature zone or a sub-freezing temperature zone or a freezing temperature zone, executing a third step, wherein the set temperature of sub-freezing is-12 ℃, the sub-freezing temperature zone is-12.5 ℃ to-11.5 ℃, the set temperature of freezing is-18 ℃, and the sub-freezing temperature zone is-18.5 ℃ to-17.5 ℃;
step two, the refrigeration air door 101 is opened, the air quantity in the refrigeration air channel A enters the drawer 5 through the air supply air channel 1 and the even cooling plate 3, then flows back to the air outlet 201 through the air conveying port 501, the first air conveying gap and the second air conveying gap, and finally returns to the refrigeration evaporator cabin, so that the refrigeration cycle is realized;
step three, the freezing air door 102 is opened, the air quantity in the freezing air channel B enters the drawer 5 through the air supply air channel 1 and the even cooling plate 3, then flows back to the air outlet 201 through the air conveying port 501, the first air conveying gap and the second air conveying gap, and finally returns to the refrigerating evaporator cabin, so that the refrigeration cycle is realized;
step four, after the constant-temperature chamber 2 reaches a stop point, the refrigerating air door 101 and the freezing air door 102 are both in a closed state, and then the turbulent flow fan 4 is started until the constant-temperature chamber 2 requests refrigeration again, and the step two or three is executed;
step five, monitoring the temperature in the constant-temperature chamber 2 in real time through a temperature sensor 7, and when the temperature set value of the constant-temperature chamber 2 is higher than the micro-freezing temperature interval and the temperature value in the constant-temperature chamber 2 is higher than 5 ℃, executing the step three firstly until the constant-temperature chamber 2 reaches a shutdown point and then stopping refrigeration; and repeating the step two when the constant-temperature chamber 2 requires refrigeration again, and stopping refrigeration when the constant-temperature chamber 2 reaches the stop point.
And when the temperature set value in the constant temperature chamber 2 is increased to be higher than the micro freezing temperature zone or the sub freezing temperature zone or the freezing temperature zone from the micro freezing temperature zone or the sub freezing temperature zone or the freezing temperature zone, executing the second step until the temperature in the constant temperature chamber 2 reaches the set requirement and then stopping refrigeration.
Wherein the temperature set value of the starting point of the constant temperature chamber 2 is Ton＝TSet temperature+0.5, setpoint for shutdown temperature Toff＝Ton-1。
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. An absolute constant temperature special area of a refrigerator is characterized by comprising an air supply air channel (1) horizontally arranged at the joint between a refrigeration air channel (A) and a freezing air channel (B) and a constant temperature chamber (2) arranged below the air supply air channel (1);
one end part of the air supply duct (1) is provided with a cold storage air door (101) and a freezing air door (102) in parallel from top to bottom; the refrigerating air door (101) is used for controlling the air quantity entering the air supply air channel (1) from the refrigerating air channel (A); the freezing air door (102) is used for controlling the air quantity entering the air supply air channel (1) from the freezing air channel (B);
a horizontally arranged uniform cooling plate (3) is fixedly inserted into the bottom wall of the air supply duct (1); the even cooling plate (3) is provided with a plurality of ventilation holes; the ventilation hole is used for conveying the air quantity in the air supply duct (1) into the constant-temperature chamber (2); one side of the even cooling plate (3) far away from the cold storage air door (101) or the freezing air door (102) is provided with a turbulent flow fan (4); the turbulent fan (4) is fixedly inserted on the bottom wall of the air supply duct (1); the turbulent fan (4) is used for refluxing the air quantity in the constant-temperature chamber (2) to the air supply duct (1);
an air outlet (201) is formed in the bottom wall of the constant-temperature chamber (2); a drawer (5) with an upper part in an open structure is arranged in the constant temperature chamber (2) in a sliding way; first air conveying gaps are formed between two opposite side walls of the drawer (5) and two opposite side walls of the constant-temperature chamber (2), and a second air conveying gap is formed between the bottom wall of the drawer (5) and the bottom wall of the constant-temperature chamber (2); a plurality of air conveying openings (501) are formed in the two opposite side walls of the drawer (5) in parallel; the air conveying opening (501) is formed in the bottom of the drawer (5); the air delivery opening (501) is used for delivering the air quantity in the drawer (5) to the air outlet (201) through the first air delivery gap and the second air delivery gap.
2. The absolute constant temperature special area of the refrigerator according to claim 1, wherein a heat preservation layer (6) is horizontally arranged above the even cooling plate (3); the heat preservation layer (6) is arranged on the top wall of the air supply duct (1).
3. The absolute thermostatic cell of a refrigerator according to claim 1 or 2, characterized in that the side of the cold leveling plate (3) close to the cold storage damper (101) or the freezing damper (102) is provided with a temperature sensor (7); the temperature sensor (7) is fixed on the bottom wall of the air supply duct (1); the temperature sensor (7) is used for detecting the temperature in the constant-temperature chamber (2).
4. The absolute thermostatic cell of a refrigerator according to claim 3, characterized in that said cold leveling plate (3) is made of metal; the uniform cooling plate (3) comprises a first flat plate and a second flat plate which are arranged in parallel; the first flat plate and the second flat plate are connected through a coaming in a frame structure; a plurality of connecting sleeves for forming the vent holes are fixedly inserted between the first flat plate and the second flat plate; a cavity structure is formed among the first flat plate, the second flat plate, the enclosing plate and the connecting sleeve; the cavity structure is filled with a coolant.
5. A absolute thermostatic cell for a refrigerator as claimed in claim 1 or 3, characterized in that a quick cooling tray (8) is horizontally placed on the bottom wall of said drawer (5).
6. A control method for an absolute constant temperature special area of a refrigerator is characterized by comprising the following steps:
step one, setting a temperature value in a constant temperature chamber (2); when the temperature of the constant temperature chamber (2) is set to be higher than the micro-freezing temperature range, executing a second step; when the temperature value of the constant temperature chamber (2) is set to be in a micro-freezing temperature zone or a sub-freezing temperature zone or a freezing temperature zone, executing a third step;
step two, opening a refrigeration air door (101), enabling the air quantity in a refrigeration air channel (A) to enter a drawer (5) through an air supply air channel (1) and a uniform cooling plate (3), then enabling the air quantity to flow back to an air outlet (201) through an air delivery port (501), a first air delivery gap and a second air delivery gap, and finally returning to a refrigeration evaporator cabin, so that refrigeration cycle is realized;
step three, opening a freezing air door (102), enabling the air quantity in a freezing air channel (B) to enter a drawer (5) through an air supply air channel (1) and a uniform cooling plate (3), then enabling the air quantity to flow back to an air outlet (201) through an air conveying opening (501), a first air conveying gap and a second air conveying gap, and finally returning to the refrigerating evaporator cabin, so that refrigerating circulation is achieved;
step four, after the constant-temperature chamber (2) reaches a stop point, the refrigerating air door (101) and the freezing air door (102) are both in a closed state, and then the turbulent flow fan (4) is started until the constant-temperature chamber (2) is required to refrigerate again, and the step two or the step three is executed;
step five, monitoring the temperature in the constant-temperature chamber (2) in real time through a temperature sensor (7), and when the temperature set value of the constant-temperature chamber (2) is higher than the micro-freezing temperature interval and the temperature value in the constant-temperature chamber (2) is higher than 5 ℃, executing the step three firstly until the constant-temperature chamber (2) reaches a shutdown point and then stopping refrigeration; and repeating the step two when the constant-temperature chamber (2) requires to refrigerate again, and stopping refrigeration when the constant-temperature chamber (2) reaches a stop point.
7. The method for controlling the absolute constant temperature special area of the refrigerator according to claim 6, wherein when the temperature set value in the constant temperature chamber (2) is increased from the micro freezing temperature area or the sub freezing temperature area or the freezing temperature area to be higher than the micro freezing temperature area or the sub freezing temperature area or the freezing temperature area, the second step is executed until the temperature in the constant temperature chamber (2) reaches the set requirement and then the refrigeration is stopped.
8. The method for controlling an absolute thermostatic cell of a refrigerator according to claim 6 or 7, characterized in that the set point of the starting point temperature of the thermostatic chamber (2) is Ton＝TSet temperature+0.5, setpoint for shutdown temperature Toff＝Ton-1。
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| CN202110055567.9A CN112665271A (en) | 2021-01-15 | 2021-01-15 | Absolute constant-temperature special area of refrigerator and control method |
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| CN115507599A (en) * | 2021-06-07 | 2022-12-23 | 青岛海尔电冰箱有限公司 | Refrigerating and freezing device and control method thereof |
| WO2023029808A1 (en) * | 2021-08-31 | 2023-03-09 | 青岛海尔电冰箱有限公司 | Refrigerator anti-condensation drawer assembly and anti-condensation control method therefor |
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| CN115507599A (en) * | 2021-06-07 | 2022-12-23 | 青岛海尔电冰箱有限公司 | Refrigerating and freezing device and control method thereof |
| CN115507599B (en) * | 2021-06-07 | 2024-03-19 | 青岛海尔电冰箱有限公司 | Refrigeration and freezing device and control method thereof |
| CN115507597B (en) * | 2021-06-07 | 2024-03-19 | 青岛海尔电冰箱有限公司 | Refrigeration and freezing device and control method thereof |
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Application publication date: 20210416 |