US20120159974A1 - Refrigerator and control method thereof - Google Patents
Refrigerator and control method thereof Download PDFInfo
- Publication number
- US20120159974A1 US20120159974A1 US13/313,394 US201113313394A US2012159974A1 US 20120159974 A1 US20120159974 A1 US 20120159974A1 US 201113313394 A US201113313394 A US 201113313394A US 2012159974 A1 US2012159974 A1 US 2012159974A1
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- United States
- Prior art keywords
- storage chamber
- air
- fan
- opening
- refrigerator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
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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
- 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
- F25D2317/06—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 with forced air circulation
- F25D2317/068—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 with forced air circulation characterised by the fans
- F25D2317/0684—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 with forced air circulation characterised by the fans the fans allowing rotation in reverse direction
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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
- F25D31/00—Other cooling or freezing apparatus
- F25D31/005—Combined cooling and heating devices
Definitions
- Embodiments relate to a refrigerator, the temperature of the inside of which is uniformly controlled, and a control method thereof.
- a refrigerator is an apparatus which supplies cool air generated through a refrigerating cycle of a refrigerant to food storage chambers, such as a freezing chamber and a refrigerating chamber, so as to store food in a fresh state for a long time.
- a kimchi refrigerator to ferment and store kimchi using such a refrigerator principle has been developed.
- Kimchi is fermented food using fermentation of microorganisms as well as salted food having increased preservation using salt, and a rate at which fermentation of kimchi proceeds is varied according to salinity and temperature of kimchi. Ripening and storing temperatures of kimchi stored in a storage chamber are set based on standard kimchi. A salinity value of the standard kimchi is generally in the range of about 2.2%.
- a salinity value of kimchi deviates from the salinity value range of the standard kimchi according to regions in which kimchi is consumed, seasons and kinds of kimchi and respective family tastes. If the salinity of kimchi is lower than that of the standard kimchi, moisture or juice in kimchi tissue is frozen. That is, when a kimchi container is stored in the storage chamber, local supercooling in which kimchi located close to a discharge hole to discharge cool air is frozen occurs due to a narrow channel space within the storage chamber, and kimchi located close to a suction hole to suck air is more rapidly ripened and preservation of the taste of well-ripened kimchi is difficult. Since roles of the suction hole and the discharge hole to form an air flow are fixed, the air flow in the storage chamber is not uniformly distributed.
- a refrigerator in which a flow of cool air in a storage chamber is uniformly distributed so as to prevent local supercooling and to uniformly maintain internal temperature of the storage chamber by interchanging roles of suction and discharge holes in various manners under various conditions, and a control method thereof.
- a refrigerator includes a storage chamber, an evaporator to cool air in the storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air cooled by the evaporator to the inside of the storage chamber, a fan provided with blades, which are driven at a first angle and a second angle, and a control unit to adjust the direction of a flow of the air by driving the fan at the first angle so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening and by driving the fan at the second angle so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening.
- the first angle and the second angle may be blade angles having reverse delta values.
- the control unit may drive the fan at the first angle or the second angle so as to periodically change the direction of the air flow.
- a refrigerator in accordance with another aspect, includes a storage chamber, an evaporator to cool air in the storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air cooled by the evaporator to the inside of the storage chamber, first and second fans to respectively generate flows of the air in opposite directions, and a control unit to adjust the direction of the air flow by driving the first fan so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening and by driving the second fan so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening.
- the first fan and the second fan may have blade angles having reverse values.
- the control unit may drive the first and second fans so as to periodically change the direction of the air flow.
- a refrigerator in accordance with another aspect, includes a storage chamber, an evaporator to cool air in the storage chamber, a pair of first openings to suck the air in the storage chamber, a pair of second openings to discharge the air cooled by the evaporator to the inside of the storage chamber, first and second ducts respectively connecting the pair of first openings and the pair of second openings to form air channels in the storage chamber, first and second dampers installed in the first and second ducts to permit or block the air flow toward one of the first and second ducts, and a control unit to adjust the direction of the air flow by controlling the first and second dampers so that the air flows toward one of the first and second ducts.
- the first and second dampers may be installed at an intersection between the first and second ducts.
- the control unit may drive the first and second dampers so as to periodically change the direction of the air flow.
- the refrigerator may further include a third duct at which the first duct and the second duct meet, and the evaporator and a fan may be installed in the third duct.
- the pair of first openings and the pair of second openings may be respectively installed at upper and lower portions of the rear surface of the storage chamber.
- the pair of first openings and the pair of second openings may be respectively installed at both side surfaces of the storage chamber.
- a control method of a refrigerator which has a storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air to the inside of the storage chamber, and a fan provided with blades, the angle of which is varied, to generate a flow of the air, includes driving the fan at a first angle of the blades so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening, judging whether or not a designated time has elapsed, and driving the fan at a second angle of the blades so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening, upon judging that the designated time has elapsed.
- the driving of the fan at the first angle of the blades and the driving of the fan at the second angle of the blades may be periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
- a control method of a refrigerator which has a storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air to the inside of the storage chamber, and first and second fans to respectively generate flows of the air in opposite directions, includes driving the first fan so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening, judging whether or not a designated time has elapsed, and driving the second fan so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening, upon judging that the designated time has elapsed.
- the driving of the first fan and the driving of the second fan may be periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
- a control method of a refrigerator which has a storage chamber, a pair of first openings to suck the air in the storage chamber, a pair of second openings to discharge the air to the inside of the storage chamber, first and second ducts respectively connecting the pair of first openings and the pair of second openings to form air channels in the storage chamber, and first and second dampers installed in the first and second ducts to permit or block the air flow toward one of the first and second ducts, includes driving the first and second dampers so that the air flows toward one of the first and second ducts, judging whether or not a designated time has elapsed, and driving the first and second dampers so that the air flows toward the other one of the first and second ducts, upon judging that the designated time has elapsed.
- the driving of the first and second dampers so that the air flows toward one of the first and second ducts and the driving of the first and second dampers so that the air flows toward the other one of the first and second ducts may be periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
- FIG. 1 is a perspective view illustrating a configuration of a refrigerator applied to one embodiment
- FIG. 2 is a cross-sectional view illustrating a first storage chamber of the refrigerator in accordance with the embodiment
- FIG. 3 is a control block diagram of the refrigerator in accordance with the embodiment.
- FIG. 4 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with the embodiment
- FIG. 5 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with the embodiment
- FIG. 6 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with the embodiment
- FIGS. 7A and 7B are views illustrating a structure of a fan with a varied blade angle to change the direction of the air flow of the refrigerator in accordance with the embodiment
- FIG. 8 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment
- FIG. 9 is a control block diagram of the refrigerator in accordance with the embodiment.
- FIG. 10 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with the embodiment
- FIG. 11 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with the embodiment
- FIG. 12 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with the embodiment
- FIG. 13 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment
- FIG. 14 is a control block diagram of the refrigerator in accordance with the embodiment.
- FIG. 15 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with the embodiment
- FIG. 16 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with the embodiment.
- FIG. 17 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with the embodiment.
- FIG. 1 is a perspective view illustrating a configuration of a refrigerator applied to one embodiment.
- a refrigerator 1 in accordance with this embodiment includes a box-shaped main body 10 forming the external appearance of the refrigerator 1 , a plurality of storage chambers 21 , 22 and 23 formed in the main body 10 to store food, and doors 31 , 32 and 33 connected to the main body 10 to open and close the plurality of storage chambers 21 , 22 and 23 .
- the plurality of storage chambers 21 , 22 and 23 is vertically divided into a first storage chamber 21 , a second storage chamber 22 and a third storage chamber 23 by diaphragms.
- the first storage chamber 21 , the second storage chamber 22 and the third storage chamber 23 respectively form independent storage spaces, and storage temperatures of the storage chambers 21 , 22 and 23 are independently controlled according to amounts of cool air supplied to the respective storage chambers 21 , 22 and 23 .
- first storage chamber 21 is divided into plural spaces by plural shelves such that food may be put on the respective shelves.
- a first opening (hereinafter, referred to as a ‘suction hole’) 24 and a second opening (hereinafter, referred to as a ‘discharge hole’) 25 to form an air flow at the inside of the first storage chamber 21 are formed through the rear surface of the first storage chamber 21 .
- the suction hole 24 is provided at the lower portion of the rear surface of the first storage chamber 21 so as to suck air in the first storage chamber 21
- the discharge hole 25 is provided at the upper portion of the rear surface of the first storage chamber 21 so as to discharge cool air to the inside of the first storage chamber 21 .
- a temperature sensor 26 to sense a temperature in the first storage chamber 21 is installed at the lower portion of the rear surface of the first storage chamber 21 .
- the doors 31 , 32 and 33 include a rotating door 31 rotatably connected to the main body 10 so as to open and close the first storage chamber 21 , and drawer-type doors 32 and 33 slidably connected to the main body 10 so as to open and close the second storage chamber 22 and the third storage chamber 23 .
- FIG. 2 is a cross-sectional view illustrating the first storage chamber of the refrigerator in accordance with the embodiment.
- an evaporator 27 to cool air of the first storage chamber 21 is installed at the rear portion of the inside of the first storage chamber 21 , and a fan 28 to circulate air to the inside of the first storage chamber 21 is installed above the evaporator 27 .
- the fan 28 is a blade fan having a delta angle. Roles of the suction hole 24 and the discharge hole 25 may be interchanged by varying the angle of blades of the fan 28 .
- the suction hole 24 formed at the lower portion of the rear surface of the first storage chamber 21 serves to suck air, as it is, and the discharge hole 25 formed at the upper portion of the rear surface of the first storage chamber 21 serves to discharge cool air, as it is.
- the discharge hole 25 formed at the upper portion of the rear surface of the first storage chamber 21 serves to suck air and the suction hole 24 formed at the lower portion of the rear surface of the first storage chamber 21 serves to discharge cool air.
- roles of the suction hole 24 and the discharge hole 25 formed at the lower and upper portions of the rear surface of the first storage chamber 21 are not fixed, but may be interchanged by varying the blade angle of the fan 28 .
- FIG. 3 is a control block diagram of the refrigerator in accordance with the embodiment.
- the refrigerator includes the temperature sensor 26 , an input unit 50 , a control unit 52 , a fan drive unit 54 and a display unit 58 .
- the input unit 50 serves to input user's control command to the control unit 52 , and is provided with plural buttons including a start button to start temperature control of food and a temperature set button to set a temperature at which the food is to be stored.
- the control unit 52 is a microcomputer to control the overall operation of the refrigerator 1 , and controls driving of the fan 28 so that roles of the suction hole 24 and the discharge hole 25 are interchanged in various manners under various conditions.
- Conditions to interchange the roles of the suction hole 24 and the discharge hole 25 include change of the direction of an air flow by varying the blade angle of the fan 28 , as shown in FIG. 2 , change of the direction of an air flow using two fans having reverse blade angles, and change of the direction or an air flow using dampers.
- the control unit 52 first drives the fan 28 at the first angle.
- air in the first storage chamber 21 is sucked through the suction hole 24 formed at the lower portion of the rear surface of the first storage chamber 21 , and the sucked air is cooled into low-humidity and low-temperature air through the evaporator 27 and is discharged to the inside of the first storage chamber 21 through the discharge hole 25 formed at the upper portion of the rear surface of the first storage chamber 21 . Thereby, air flows in the upward direction.
- control unit 52 drives the fan 28 at the second angle.
- control unit 52 alternately drives the fan 28 at different angles, i.e., the first angle and the second angle, every designated time (for example, every 2 hours), air flows in the upward direction and then flows in the downward direction and thus the roles of the suction hole 24 and the discharge hole 25 are periodically interchanged. Thereby, the air flow within the first storage chamber 21 is uniformly distributed and thus the temperature within the first storage chamber 21 is uniformly maintained.
- the fan drive unit 54 controls driving of the fan 28 according to a control signal from the control unit 52 , thereby varying the blade angle of the fan 28 .
- the display unit 58 displays an operating state (for example, a kind, a ripening time or a temperature condition of food stored in the storage chamber) of the refrigerator 1 or various set values according to a control signal from the control unit 52 .
- an operating state for example, a kind, a ripening time or a temperature condition of food stored in the storage chamber
- FIG. 4 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with this embodiment
- FIG. 5 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with this embodiment
- FIG. 6 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with this embodiment
- FIGS. 7A and 7B are views illustrating a structure of the fan with a varied blade angle to change the direction of the air flow of the refrigerator in accordance with this embodiment.
- the user inputs a set temperature through the temperature set button provided on the input unit 50 and then operates the start button, cool air generated by the general refrigerating cycle is supplied to the inside of the first storage chamber 21 and then starts lowering of the internal temperature of the storage chamber 21 .
- control unit 52 drives the fan 28 at the first angle, as shown in FIG. 7A , through the fan drive unit 54 (Operation 100 ).
- the fan 28 is driven under the condition that the angle of respective blades 30 is set to the first angle, as shown in FIG. 7A , by connecting inner parts of the respective blades 30 to a motor (not shown) of the fan drive unit 54 , specifically a motor rotating shaft 30 a provided to convert the angle of the blades 30 separately from a fan rotating motor, and then rotating the motor by a desired degree.
- a motor not shown
- a motor rotating shaft 30 a provided to convert the angle of the blades 30 separately from a fan rotating motor, and then rotating the motor by a desired degree.
- the fan drive unit 54 controls driving of the fan 28 according to the control signal from the control unit 52 , thereby setting the blade angle of the fan 28 to the first angle, as shown in FIG. 7A .
- control unit 52 counts time for which the fan 28 is driven at the first angle (Operation 102 ), and judges whether or not a designated time (for example, 2 hours) has elapsed (Operation 104 ).
- control unit 52 drives the fan 28 at the second angle, as shown in FIG. 7B , through the fan drive unit 54 (Operation 106 ).
- the fan 28 is driven under the condition that the angle of the respective blades 30 is set to the second angle, as shown in FIG. 7B , by connecting the inner parts of respective blades 30 to the motor rotating shaft 30 a of the motor (not shown) of the fan drive unit 54 and then rotating the motor by a desired degree.
- control unit 52 counts time for which the fan 28 is driven at the second angle (Operation 108 ), and judges whether or not a designated time has elapsed (Operation 110 ).
- FIG. 8 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment.
- Some parts in this embodiment shown in FIG. 8 which are substantially the same as those in the embodiment shown in FIG. 2 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
- an evaporator 27 to cool air of the first storage chamber 21 is installed at the rear portion of the inside of the first storage chamber 21 , and first and second fans 29 a and 29 b to circulate air to the inside of the first storage chamber 21 are installed above the evaporator 27 .
- the first and second fans 29 a and 29 b are blade fans having reverse delta angles. Roles of the suction hole 24 and the discharge hole 25 may be interchanged by respectively driving the first and second fans 29 a and 29 b.
- the suction hole 24 formed at the lower portion of the rear surface of the first storage chamber 21 serves to suck air in the first storage chamber 21 , as it is, and the discharge hole 25 formed at the upper portion of the rear surface of the first storage chamber 21 serves to discharge cool air to the inside of the first storage chamber 21 , as it is.
- the discharge hole 25 formed at the upper portion of the rear surface of the first storage chamber 21 serves to suck air in the first storage chamber 21 and the suction hole 24 formed at the lower portion of the rear surface of the first storage chamber 21 serves to discharge cool air to the inside of the first storage chamber 21 .
- the roles of the suction hole 24 and the discharge hole 25 formed at the lower and upper portions of the rear surface of the first storage chamber 21 are not fixed, but may be interchanged according to whether or not the first and second fans 29 a and 29 b are driven.
- FIG. 9 is a control block diagram of the refrigerator in accordance with this embodiment. Some parts in this embodiment shown in FIG. 9 , which are substantially the same as those in the embodiment shown in FIG. 3 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
- the control unit 52 is a microcomputer to control the overall operation of the refrigerator 1 , and controls driving of the first and second fans 29 a and 29 b so that the roles of the suction hole 24 and the discharge hole 25 are interchanged in various manners under various conditions.
- a condition to interchange the roles of the suction hole 24 and the discharge hole 25 is change of the direction of an air flow using the first and second fans 29 a and 29 b having reverse blade angles.
- control unit 52 drives the first fan 29 a.
- control unit 52 drives the second fan 29 b.
- control unit 52 alternately drives the first and second fans 29 a and 29 b every designated time (for example, every 2 hours)
- the air flow within the first storage chamber 21 is uniformly distributed and thus the temperature within the first storage chamber 21 is uniformly maintained.
- the fan drive unit 54 controls driving of the first and second fans 29 a and 29 b according to a control signal from the control unit 52 , thereby alternately driving the first and second fans 29 a and 29 b.
- FIG. 10 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with this embodiment
- FIG. 11 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with this embodiment
- FIG. 12 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with this embodiment.
- the control unit 52 drives the first fan 29 a through the fan drive unit 54 (Operation 200 ).
- control unit 52 counts time for which the first fan 29 a is driven (Operation 202 ), and judges whether or not a designated time has elapsed (Operation 204 ).
- control unit 52 drives the second fan 29 b through the fan drive unit 54 (Operation 206 ).
- control unit 52 counts time for which the second fan 29 b is driven (Operation 208 ), and judges whether or not a designated time has elapsed (Operation 210 ).
- FIG. 13 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment.
- Some parts in this embodiment shown in FIG. 13 which are substantially the same as those in the embodiment shown in FIG. 2 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
- two suction holes 24 a and 24 b and two discharge holes 25 a and 25 b to induce an air flow in the first storage chamber 21 are formed on the rear surface of the first storage chamber 21 .
- the suction holes 24 a and 24 b are provided at the upper and lower portions of the rear surface of the first storage chamber 21 so as to suck air in the first storage chamber 21
- the discharge holes 25 a and 25 b are provided at the upper and lower portions of the rear surface of the first storage chamber 21 so as to discharge cool air to the inside of the first storage chamber 21 .
- first and second ducts 41 and 42 which are extended in the vertical direction to uniformly distribute air throughout the overall space of the first storage chamber 21 are installed at the rear portion of the inside of the first storage chamber 21 , and a third duct 43 to change the direction of the air flow is installed at an intersection between the first and second ducts 41 and 42 .
- An evaporator 27 to cool air of the first storage chamber 21 and a fan 28 to circulate the air of the first storage chamber 21 are installed within the third duct 43 .
- First and second dampers 45 and 46 to adjust the direction of the air flow so as to allow air circulated by the fan 28 to move toward the first duct 41 or the second duct 42 are installed at both ends of the third duct 43 connected with the first and second ducts 41 and 42 .
- the first and second dampers 45 and 46 are driven by damper motors (not shown), thereby changing the direction of the air flow and thus interchanging roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 25 b.
- the suction hole 24 a formed at the lower portion of the left side of the rear surface of the first storage chamber 21 serves to suck air in the first storage chamber 21 and the discharge hole 25 a formed at the upper portion of the right side of the rear surface of the first storage chamber 21 serves to discharge cool air to the inside of the first storage chamber 21 . Thereby, air flows in the upward direction.
- the suction hole 24 b formed at the upper portion of the left side of the rear surface of the first storage chamber 21 serves to suck air in the first storage chamber 21 and the discharge hole 25 b formed at the lower portion of the right side of the rear surface of the first storage chamber 21 serves to discharge cool air to the inside of the first storage chamber 21 . Thereby, air flows in the downward direction.
- the roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 15 b respectively formed at the upper and lower portions of the rear surface of the first storage chamber 21 are not fixed, but may be interchanged according to whether or not the first and second dampers 45 and 46 are driven.
- this embodiment illustrates that a pair of suction holes 24 a and 24 b and a pair of discharge holes 25 a and 25 b are installed at the upper and lower portions of the rear surface of the first storage chamber 21 , the positions of the suction holes 24 a and 24 and the discharge holes 25 a and 25 b are not limited thereto.
- a pair of suction holes 24 a and 24 b and a pair of discharge holes 25 a and 25 b may be installed at both side surfaces of the first storage chamber 21 in the same manner.
- FIG. 14 is a control block diagram of the refrigerator in accordance with this embodiment. Some parts in this embodiment shown in FIG. 14 , which are substantially the same as those in the embodiment shown in FIG. 3 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary.
- the control unit 52 is a microcomputer to control the overall operation of the refrigerator 1 , and controls driving of the first and second dampers 45 and 46 so that the roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 25 b are interchanged in various manners under various conditions.
- a condition to interchange the roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 25 b is change of the direction of the air flow using the first and second dampers 45 and 46 to open and close the air channels of the first and second ducts 41 and 42 .
- control unit 52 drives the first and second dampers 45 and 46 so that the air channel connected with the first duct 41 is completely closed and the air channel connected with the second duct 42 is completely opened.
- the control unit 52 drives the first and second dampers 45 and 46 so that the air channel connected with the first duct 41 is completely opened and the air channel connected with the second duct 42 is completely closed.
- the control unit 52 sequentially drives the first and second dampers 45 and 46 every designated time (for example, every 2 hours), air flows in the upward direction and then flows in the downward direction and thus the roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 25 b are periodically interchanged. Thereby, the air flow within the first storage chamber 21 is uniformly distributed and thus the temperature within the first storage chamber 21 is uniformly maintained.
- a damper drive unit 56 controls driving of the first and second dampers 45 and 46 according to a control signal from the control unit 52 , thereby changing the direction of the air flow.
- FIG. 15 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with this embodiment
- FIG. 16 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with this embodiment
- FIG. 17 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with this embodiment.
- control unit 52 drives the fan 28 through the fan drive unit 54 (Operation 300 ).
- control unit 52 drives the first and second dampers 45 and 46 through the damper drive unit 56 so that the air channel connected with the first duct 41 is completely closed and the air channel connected with the second duct 42 is completely opened (Operation 302 ).
- control unit 52 counts time for which the first and second dampers 45 and 46 are driven so that the air channel of the second duct 42 is opened (Operation 304 ), and judges whether or not a designated time has elapsed (Operation 306 ).
- control unit 52 drives the first and second dampers 45 and 46 through the damper drive unit 56 so that the air channel connected with the first duct 41 is completely opened and the air channel connected with the second duct 42 is completely closed (Operation 308 ).
- control unit 52 counts time for which the first and second dampers 45 and 46 are driven so that the air channel of the first duct 41 is opened (Operation 310 ), and judges whether or not a designated time has elapsed (Operation 312 ).
Abstract
A refrigerator, the temperature of the inside of which is uniformly controlled, and a control method thereof. The direction of an air flow in a storage chamber is periodically changed so as to uniformly distribute cool air in the storage chamber by interchanging roles of suction and discharge holes in various manners under various conditions, thereby preventing local supercooling and thus uniformly maintaining the internal temperature of the storage chamber.
Description
- This application claims the benefit of Korean Patent Application No. 2010-0132638, filed on Dec. 22, 2010 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
- 1. Field
- Embodiments relate to a refrigerator, the temperature of the inside of which is uniformly controlled, and a control method thereof.
- 2. Description of the Related Art
- In general, a refrigerator is an apparatus which supplies cool air generated through a refrigerating cycle of a refrigerant to food storage chambers, such as a freezing chamber and a refrigerating chamber, so as to store food in a fresh state for a long time. Recently, a kimchi refrigerator to ferment and store kimchi using such a refrigerator principle has been developed.
- Kimchi is fermented food using fermentation of microorganisms as well as salted food having increased preservation using salt, and a rate at which fermentation of kimchi proceeds is varied according to salinity and temperature of kimchi. Ripening and storing temperatures of kimchi stored in a storage chamber are set based on standard kimchi. A salinity value of the standard kimchi is generally in the range of about 2.2%.
- A salinity value of kimchi deviates from the salinity value range of the standard kimchi according to regions in which kimchi is consumed, seasons and kinds of kimchi and respective family tastes. If the salinity of kimchi is lower than that of the standard kimchi, moisture or juice in kimchi tissue is frozen. That is, when a kimchi container is stored in the storage chamber, local supercooling in which kimchi located close to a discharge hole to discharge cool air is frozen occurs due to a narrow channel space within the storage chamber, and kimchi located close to a suction hole to suck air is more rapidly ripened and preservation of the taste of well-ripened kimchi is difficult. Since roles of the suction hole and the discharge hole to form an air flow are fixed, the air flow in the storage chamber is not uniformly distributed.
- Therefore, it is an aspect to provide a refrigerator, in which a flow of cool air in a storage chamber is uniformly distributed so as to prevent local supercooling and to uniformly maintain internal temperature of the storage chamber by interchanging roles of suction and discharge holes in various manners under various conditions, and a control method thereof.
- Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the invention.
- In accordance with one aspect, a refrigerator includes a storage chamber, an evaporator to cool air in the storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air cooled by the evaporator to the inside of the storage chamber, a fan provided with blades, which are driven at a first angle and a second angle, and a control unit to adjust the direction of a flow of the air by driving the fan at the first angle so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening and by driving the fan at the second angle so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening.
- The first angle and the second angle may be blade angles having reverse delta values.
- The control unit may drive the fan at the first angle or the second angle so as to periodically change the direction of the air flow.
- in accordance with another aspect, a refrigerator includes a storage chamber, an evaporator to cool air in the storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air cooled by the evaporator to the inside of the storage chamber, first and second fans to respectively generate flows of the air in opposite directions, and a control unit to adjust the direction of the air flow by driving the first fan so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening and by driving the second fan so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening.
- The first fan and the second fan may have blade angles having reverse values.
- The control unit may drive the first and second fans so as to periodically change the direction of the air flow.
- In accordance with another aspect, a refrigerator includes a storage chamber, an evaporator to cool air in the storage chamber, a pair of first openings to suck the air in the storage chamber, a pair of second openings to discharge the air cooled by the evaporator to the inside of the storage chamber, first and second ducts respectively connecting the pair of first openings and the pair of second openings to form air channels in the storage chamber, first and second dampers installed in the first and second ducts to permit or block the air flow toward one of the first and second ducts, and a control unit to adjust the direction of the air flow by controlling the first and second dampers so that the air flows toward one of the first and second ducts.
- The first and second dampers may be installed at an intersection between the first and second ducts.
- The control unit may drive the first and second dampers so as to periodically change the direction of the air flow.
- The refrigerator may further include a third duct at which the first duct and the second duct meet, and the evaporator and a fan may be installed in the third duct.
- The pair of first openings and the pair of second openings may be respectively installed at upper and lower portions of the rear surface of the storage chamber.
- The pair of first openings and the pair of second openings may be respectively installed at both side surfaces of the storage chamber.
- In accordance with another aspect, a control method of a refrigerator, which has a storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air to the inside of the storage chamber, and a fan provided with blades, the angle of which is varied, to generate a flow of the air, includes driving the fan at a first angle of the blades so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening, judging whether or not a designated time has elapsed, and driving the fan at a second angle of the blades so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening, upon judging that the designated time has elapsed.
- The driving of the fan at the first angle of the blades and the driving of the fan at the second angle of the blades may be periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
- In accordance with another aspect, a control method of a refrigerator, which has a storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air to the inside of the storage chamber, and first and second fans to respectively generate flows of the air in opposite directions, includes driving the first fan so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening, judging whether or not a designated time has elapsed, and driving the second fan so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening, upon judging that the designated time has elapsed.
- The driving of the first fan and the driving of the second fan may be periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
- In accordance with a further aspect, a control method of a refrigerator, which has a storage chamber, a pair of first openings to suck the air in the storage chamber, a pair of second openings to discharge the air to the inside of the storage chamber, first and second ducts respectively connecting the pair of first openings and the pair of second openings to form air channels in the storage chamber, and first and second dampers installed in the first and second ducts to permit or block the air flow toward one of the first and second ducts, includes driving the first and second dampers so that the air flows toward one of the first and second ducts, judging whether or not a designated time has elapsed, and driving the first and second dampers so that the air flows toward the other one of the first and second ducts, upon judging that the designated time has elapsed.
- The driving of the first and second dampers so that the air flows toward one of the first and second ducts and the driving of the first and second dampers so that the air flows toward the other one of the first and second ducts may be periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
- These and/or other aspects of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
-
FIG. 1 is a perspective view illustrating a configuration of a refrigerator applied to one embodiment; -
FIG. 2 is a cross-sectional view illustrating a first storage chamber of the refrigerator in accordance with the embodiment; -
FIG. 3 is a control block diagram of the refrigerator in accordance with the embodiment; -
FIG. 4 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with the embodiment; -
FIG. 5 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with the embodiment; -
FIG. 6 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with the embodiment; -
FIGS. 7A and 7B are views illustrating a structure of a fan with a varied blade angle to change the direction of the air flow of the refrigerator in accordance with the embodiment; -
FIG. 8 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment; -
FIG. 9 is a control block diagram of the refrigerator in accordance with the embodiment; -
FIG. 10 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with the embodiment; -
FIG. 11 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with the embodiment; -
FIG. 12 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with the embodiment; -
FIG. 13 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment; -
FIG. 14 is a control block diagram of the refrigerator in accordance with the embodiment; -
FIG. 15 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with the embodiment; -
FIG. 16 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with the embodiment; and -
FIG. 17 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with the embodiment. - Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
-
FIG. 1 is a perspective view illustrating a configuration of a refrigerator applied to one embodiment. - As shown in
FIG. 1 , arefrigerator 1 in accordance with this embodiment includes a box-shapedmain body 10 forming the external appearance of therefrigerator 1, a plurality ofstorage chambers main body 10 to store food, anddoors main body 10 to open and close the plurality ofstorage chambers - The plurality of
storage chambers first storage chamber 21, asecond storage chamber 22 and athird storage chamber 23 by diaphragms. Thefirst storage chamber 21, thesecond storage chamber 22 and thethird storage chamber 23 respectively form independent storage spaces, and storage temperatures of thestorage chambers respective storage chambers - Further, the
first storage chamber 21 is divided into plural spaces by plural shelves such that food may be put on the respective shelves. A first opening (hereinafter, referred to as a ‘suction hole’) 24 and a second opening (hereinafter, referred to as a ‘discharge hole’) 25 to form an air flow at the inside of thefirst storage chamber 21 are formed through the rear surface of thefirst storage chamber 21. - The
suction hole 24 is provided at the lower portion of the rear surface of thefirst storage chamber 21 so as to suck air in thefirst storage chamber 21, and thedischarge hole 25 is provided at the upper portion of the rear surface of thefirst storage chamber 21 so as to discharge cool air to the inside of thefirst storage chamber 21. - Further, a
temperature sensor 26 to sense a temperature in thefirst storage chamber 21 is installed at the lower portion of the rear surface of thefirst storage chamber 21. - The
doors rotating door 31 rotatably connected to themain body 10 so as to open and close thefirst storage chamber 21, and drawer-type doors main body 10 so as to open and close thesecond storage chamber 22 and thethird storage chamber 23. -
FIG. 2 is a cross-sectional view illustrating the first storage chamber of the refrigerator in accordance with the embodiment. - As shown in
FIG. 2 , anevaporator 27 to cool air of thefirst storage chamber 21 is installed at the rear portion of the inside of thefirst storage chamber 21, and afan 28 to circulate air to the inside of thefirst storage chamber 21 is installed above theevaporator 27. - The
fan 28 is a blade fan having a delta angle. Roles of thesuction hole 24 and thedischarge hole 25 may be interchanged by varying the angle of blades of thefan 28. - For example, if the
fan 28 is driven at the current delta angle of the blades (hereinafter, referred to as a first angle), thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21 serves to suck air, as it is, and thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21 serves to discharge cool air, as it is. - On the other hand, if the
fan 28 is driven at the reverse delta angle of the blades (hereinafter, referred to as a second angle), thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21 serves to suck air and thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21 serves to discharge cool air. - That is, roles of the
suction hole 24 and thedischarge hole 25 formed at the lower and upper portions of the rear surface of thefirst storage chamber 21 are not fixed, but may be interchanged by varying the blade angle of thefan 28. -
FIG. 3 is a control block diagram of the refrigerator in accordance with the embodiment. The refrigerator includes thetemperature sensor 26, aninput unit 50, acontrol unit 52, afan drive unit 54 and adisplay unit 58. - The
input unit 50 serves to input user's control command to thecontrol unit 52, and is provided with plural buttons including a start button to start temperature control of food and a temperature set button to set a temperature at which the food is to be stored. - The
control unit 52 is a microcomputer to control the overall operation of therefrigerator 1, and controls driving of thefan 28 so that roles of thesuction hole 24 and thedischarge hole 25 are interchanged in various manners under various conditions. - Conditions to interchange the roles of the
suction hole 24 and thedischarge hole 25 include change of the direction of an air flow by varying the blade angle of thefan 28, as shown inFIG. 2 , change of the direction of an air flow using two fans having reverse blade angles, and change of the direction or an air flow using dampers. - Hereinafter, interchange of the roles of the
suction hole 24 and thedischarge hole 25 by changing the direction of an air flow by varying the blade angle of thefan 28 will be described first. Further, change of the direction of an air flow using two fans having reverse blade angles and change of the direction of an air flow using dampers will be described later with reference toFIGS. 8 to 17 . - First, if the roles of the
suction hole 24 and thedischarge hole 25 are interchanged by changing the direction of the air flow by varying the blade angle of thefan 28, thecontrol unit 52 first drives thefan 28 at the first angle. - As the
fan 28 is driven at the first angle, air in thefirst storage chamber 21 is sucked through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21. Thereby, air flows in the upward direction. - Thereafter, when a designated time has elapsed (for example, 2 hours), the
control unit 52 drives thefan 28 at the second angle. - As the
fan 28 is driven at the second angle, air in thefirst storage chamber 21 sucked through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21. Thereby, air flows in the downward direction. - Through the above method in which the
control unit 52 alternately drives thefan 28 at different angles, i.e., the first angle and the second angle, every designated time (for example, every 2 hours), air flows in the upward direction and then flows in the downward direction and thus the roles of thesuction hole 24 and thedischarge hole 25 are periodically interchanged. Thereby, the air flow within thefirst storage chamber 21 is uniformly distributed and thus the temperature within thefirst storage chamber 21 is uniformly maintained. - The
fan drive unit 54 controls driving of thefan 28 according to a control signal from thecontrol unit 52, thereby varying the blade angle of thefan 28. - The
display unit 58 displays an operating state (for example, a kind, a ripening time or a temperature condition of food stored in the storage chamber) of therefrigerator 1 or various set values according to a control signal from thecontrol unit 52. - Hereinafter, the refrigerator in accordance with this embodiment of the present invention, a control method thereof and an operating process, functions and effects thereof will be described with reference to
FIGS. 4 to 7B . -
FIG. 4 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with this embodiment,FIG. 5 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with this embodiment,FIG. 6 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with this embodiment, andFIGS. 7A and 7B are views illustrating a structure of the fan with a varied blade angle to change the direction of the air flow of the refrigerator in accordance with this embodiment. - With reference to
FIG. 4 , after a user places food to be stored at the inside of thefirst storage chamber 21, the user inputs a set temperature through the temperature set button provided on theinput unit 50 and then operates the start button, cool air generated by the general refrigerating cycle is supplied to the inside of thefirst storage chamber 21 and then starts lowering of the internal temperature of thestorage chamber 21. - Then, in order to uniformly control an air flow (specifically, a cool air flow) in the
first storage chamber 21, thecontrol unit 52 drives thefan 28 at the first angle, as shown inFIG. 7A , through the fan drive unit 54 (Operation 100). - The
fan 28 is driven under the condition that the angle ofrespective blades 30 is set to the first angle, as shown inFIG. 7A , by connecting inner parts of therespective blades 30 to a motor (not shown) of thefan drive unit 54, specifically amotor rotating shaft 30 a provided to convert the angle of theblades 30 separately from a fan rotating motor, and then rotating the motor by a desired degree. - The
fan drive unit 54 controls driving of thefan 28 according to the control signal from thecontrol unit 52, thereby setting the blade angle of thefan 28 to the first angle, as shown inFIG. 7A . - When the
fan 28 is driven at the first angle, air flows in the upward direction, as shown inFIG. 5 . Thereby, air in thefirst storage chamber 21 is sucked through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21. - Then, the
control unit 52 counts time for which thefan 28 is driven at the first angle (Operation 102), and judges whether or not a designated time (for example, 2 hours) has elapsed (Operation 104). - As a result of the judgment of
Operation 104, if the designated time has not elapsed, the process is fed back toOperation 102 and thecontrol unit 52 counts time until the designated time has elapsed. - On the other hand, as the result of the judgment of
Operation 104, if the designated time has elapsed, thecontrol unit 52 drives thefan 28 at the second angle, as shown inFIG. 7B , through the fan drive unit 54 (Operation 106). - Here, the
fan 28 is driven under the condition that the angle of therespective blades 30 is set to the second angle, as shown inFIG. 7B , by connecting the inner parts ofrespective blades 30 to themotor rotating shaft 30 a of the motor (not shown) of thefan drive unit 54 and then rotating the motor by a desired degree. - When the
fan 28 is driven at the second angle, air flows in the downward direction, as shown inFIG. 6 . Thereby, air in thefirst storage chamber 21 is sucked through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21. - Then, the
control unit 52 counts time for which thefan 28 is driven at the second angle (Operation 108), and judges whether or not a designated time has elapsed (Operation 110). - As a result of the judgment of
Operation 110, if the designated time has not elapsed, the process is fed back toOperation 108 and thecontrol unit 52 counts time until the designated time has elapsed. - On the other hand, as the result of the judgment of
Operation 110, if the designated time has elapsed, the process is fed back toOperation 100 and thecontrol unit 52 drives thefan 28 at the first angle through thefan drive unit 54. - Through the above method, air flows in the upward direction, flows in the downward direction and then flows in the upward direction and thus the roles of the
suction hole 24 and thedischarge hole 25 are periodically interchanged. Thereby, cool air in thefirst storage chamber 21 is uniformly distributed and thus the temperature within thefirst storage chamber 21 is uniformly maintained. -
FIG. 8 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment. Some parts in this embodiment shown inFIG. 8 , which are substantially the same as those in the embodiment shown inFIG. 2 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary. - As shown in
FIG. 8 , anevaporator 27 to cool air of thefirst storage chamber 21 is installed at the rear portion of the inside of thefirst storage chamber 21, and first andsecond fans first storage chamber 21 are installed above theevaporator 27. - The first and
second fans suction hole 24 and thedischarge hole 25 may be interchanged by respectively driving the first andsecond fans - For example, if the
first fan 29 a is driven, thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21 serves to suck air in thefirst storage chamber 21, as it is, and thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21 serves to discharge cool air to the inside of thefirst storage chamber 21, as it is. - On the other hand, if the
second fan 29 b is driven, thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21 serves to suck air in thefirst storage chamber 21 and thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21 serves to discharge cool air to the inside of thefirst storage chamber 21. - That is, the roles of the
suction hole 24 and thedischarge hole 25 formed at the lower and upper portions of the rear surface of thefirst storage chamber 21 are not fixed, but may be interchanged according to whether or not the first andsecond fans -
FIG. 9 is a control block diagram of the refrigerator in accordance with this embodiment. Some parts in this embodiment shown inFIG. 9 , which are substantially the same as those in the embodiment shown inFIG. 3 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary. - The
control unit 52 is a microcomputer to control the overall operation of therefrigerator 1, and controls driving of the first andsecond fans suction hole 24 and thedischarge hole 25 are interchanged in various manners under various conditions. - Here, a condition to interchange the roles of the
suction hole 24 and thedischarge hole 25 is change of the direction of an air flow using the first andsecond fans - First, the
control unit 52 drives thefirst fan 29 a. - As the
first fan 29 a is driven, air in thefirst storage chamber 21 is sucked through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21. Thereby, air flows in the upward direction. - Thereafter, if a designated time (for example, 2 hours) has elapsed, the
control unit 52 drives thesecond fan 29 b. - As the
second fan 29 b is driven, air in thefirst storage chamber 21 is sucked through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21. Thereby, air flows in the downward direction. - Through the above method in which the
control unit 52 alternately drives the first andsecond fans suction hole 24 and thedischarge hole 25 are periodically interchanged. Thereby, the air flow within thefirst storage chamber 21 is uniformly distributed and thus the temperature within thefirst storage chamber 21 is uniformly maintained. - The
fan drive unit 54 controls driving of the first andsecond fans control unit 52, thereby alternately driving the first andsecond fans - Hereinafter, the refrigerator in accordance with this embodiment of the present invention, a control method thereof and an operating process, functions and effects thereof will be described with reference to
FIGS. 10 to 12 . -
FIG. 10 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with this embodiment,FIG. 11 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with this embodiment, andFIG. 12 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with this embodiment. - With reference to
FIG. 10 , in order to uniformly control an air flow (specifically, a cool air flow) in thefirst storage chamber 21, thecontrol unit 52 drives thefirst fan 29 a through the fan drive unit 54 (Operation 200). - When the
first fan 29 a is driven, air flows in the upward direction, as shown inFIG. 11 . Thereby, air in thefirst storage chamber 21 is sucked through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21. - Then, the
control unit 52 counts time for which thefirst fan 29 a is driven (Operation 202), and judges whether or not a designated time has elapsed (Operation 204). - As a result of the judgment of
Operation 204, if the designated time has not elapsed, the process is fed back toOperation 202 and thecontrol unit 52 counts time until the designated time has elapsed. - On the other hand, as the result of the judgment of
Operation 204, if the designated time has elapsed, thecontrol unit 52 drives thesecond fan 29 b through the fan drive unit 54 (Operation 206). - When the
second fan 29 b is driven, air flows in the downward direction, as shown inFIG. 12 . Thereby, air in thefirst storage chamber 21 is sucked through thedischarge hole 25 formed at the upper portion of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thesuction hole 24 formed at the lower portion of the rear surface of thefirst storage chamber 21. - Then, the
control unit 52 counts time for which thesecond fan 29 b is driven (Operation 208), and judges whether or not a designated time has elapsed (Operation 210). - As a result of the judgment of
Operation 210, if the designated time has not elapsed, the process is fed back toOperation 208 and thecontrol unit 52 counts time until the designated time has elapsed. - On the other hand, as the result of the judgment of
Operation 210, if the designated time has elapsed, the process is fed back toOperation 200 and thecontrol unit 52 drives thefirst fan 29 a through thefan drive unit 54. - Through the above method, air flows in the upward direction, flows in the downward direction and then flows in the upward direction and thus the roles of the
suction hole 24 and thedischarge hole 25 are periodically interchanged. Thereby, cool air in thefirst storage chamber 21 is uniformly distributed and thus the temperature within thefirst storage chamber 21 is uniformly maintained. -
FIG. 13 is a cross-sectional view illustrating a first storage chamber of a refrigerator in accordance with another embodiment. Some parts in this embodiment shown inFIG. 13 , which are substantially the same as those in the embodiment shown inFIG. 2 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary. - As shown in
FIG. 13 , twosuction holes first storage chamber 21 are formed on the rear surface of thefirst storage chamber 21. - The suction holes 24 a and 24 b are provided at the upper and lower portions of the rear surface of the
first storage chamber 21 so as to suck air in thefirst storage chamber 21, and the discharge holes 25 a and 25 b are provided at the upper and lower portions of the rear surface of thefirst storage chamber 21 so as to discharge cool air to the inside of thefirst storage chamber 21. - Further, two ducts, i.e., first and
second ducts first storage chamber 21 are installed at the rear portion of the inside of thefirst storage chamber 21, and athird duct 43 to change the direction of the air flow is installed at an intersection between the first andsecond ducts - An evaporator 27 to cool air of the
first storage chamber 21 and afan 28 to circulate the air of thefirst storage chamber 21 are installed within thethird duct 43. - First and
second dampers fan 28 to move toward thefirst duct 41 or thesecond duct 42 are installed at both ends of thethird duct 43 connected with the first andsecond ducts - The first and
second dampers - For example, if the first and
second dampers first duct 41 is completely closed and an air channel connected with thesecond duct 42 is completely opened, thesuction hole 24 a formed at the lower portion of the left side of the rear surface of thefirst storage chamber 21 serves to suck air in thefirst storage chamber 21 and thedischarge hole 25 a formed at the upper portion of the right side of the rear surface of thefirst storage chamber 21 serves to discharge cool air to the inside of thefirst storage chamber 21. Thereby, air flows in the upward direction. - On the other hand, if the first and
second dampers first duct 41 is completely opened and the air channel connected with thesecond duct 42 is completely closed, thesuction hole 24 b formed at the upper portion of the left side of the rear surface of thefirst storage chamber 21 serves to suck air in thefirst storage chamber 21 and thedischarge hole 25 b formed at the lower portion of the right side of the rear surface of thefirst storage chamber 21 serves to discharge cool air to the inside of thefirst storage chamber 21. Thereby, air flows in the downward direction. - That is, the roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 15 b respectively formed at the upper and lower portions of the rear surface of the
first storage chamber 21 are not fixed, but may be interchanged according to whether or not the first andsecond dampers - Although this embodiment illustrates that a pair of suction holes 24 a and 24 b and a pair of discharge holes 25 a and 25 b are installed at the upper and lower portions of the rear surface of the
first storage chamber 21, the positions of the suction holes 24 a and 24 and the discharge holes 25 a and 25 b are not limited thereto. For example, a pair of suction holes 24 a and 24 b and a pair of discharge holes 25 a and 25 b may be installed at both side surfaces of thefirst storage chamber 21 in the same manner. -
FIG. 14 is a control block diagram of the refrigerator in accordance with this embodiment. Some parts in this embodiment shown inFIG. 14 , which are substantially the same as those in the embodiment shown inFIG. 3 , are denoted by the same reference numerals even though they are depicted in different drawings, and a detailed description thereof will thus be omitted because it is considered to be unnecessary. - The
control unit 52 is a microcomputer to control the overall operation of therefrigerator 1, and controls driving of the first andsecond dampers - Here, a condition to interchange the roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 25 b is change of the direction of the air flow using the first and
second dampers second ducts - First, the
control unit 52 drives the first andsecond dampers first duct 41 is completely closed and the air channel connected with thesecond duct 42 is completely opened. - As the first and
second dampers first storage chamber 21 is sucked through thesuction hole 24 a formed at the lower portion of the left side of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 a formed at the upper portion of the right side of the rear surface of thefirst storage chamber 21. Thereby, air flows in the upward direction. - Thereafter, if a designated time (for example, 2 hours) has elapsed, the
control unit 52 drives the first andsecond dampers first duct 41 is completely opened and the air channel connected with thesecond duct 42 is completely closed. - As the first and
second dampers first storage chamber 21 is sucked through thesuction hole 24 a formed at the upper portion of the left side of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 a formed at the lower portion of the right side of the rear surface of thefirst storage chamber 21. Thereby, air flows in the downward direction. - As described above, through the above method in which the
control unit 52 sequentially drives the first andsecond dampers first storage chamber 21 is uniformly distributed and thus the temperature within thefirst storage chamber 21 is uniformly maintained. - A
damper drive unit 56 controls driving of the first andsecond dampers control unit 52, thereby changing the direction of the air flow. - Hereinafter, the refrigerator in accordance with this embodiment, a control method thereof and an operating process, functions and effects thereof will be described with reference to
FIGS. 15 to 17 . -
FIG. 15 is a flow chart illustrating an algorithm to control an air flow of the refrigerator in accordance with this embodiment,FIG. 16 is a cross-sectional view illustrating an upward direction of the air flow of the refrigerator in accordance with this embodiment, andFIG. 17 is a cross-sectional view illustrating a downward direction of the air flow of the refrigerator in accordance with this embodiment. - With reference to
FIG. 15 , in order to uniformly control an air flow (specifically, a cool air flow) in thefirst storage chamber 21, thecontrol unit 52 drives thefan 28 through the fan drive unit 54 (Operation 300). - Then, the
control unit 52 drives the first andsecond dampers damper drive unit 56 so that the air channel connected with thefirst duct 41 is completely closed and the air channel connected with thesecond duct 42 is completely opened (Operation 302). - When the first and
second dampers FIG. 16 . Thereby, air in thefirst storage chamber 21 is sucked through thesuction hole 24 a formed at the lower portion of the left side of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 a formed at the upper portion of the right side of the rear surface of thefirst storage chamber 21. - Then, the
control unit 52 counts time for which the first andsecond dampers second duct 42 is opened (Operation 304), and judges whether or not a designated time has elapsed (Operation 306). - As a result of the judgment of
Operation 306, if the designated time has not elapsed, the process is fed back toOperation 304 and thecontrol unit 52 counts time until the designated time has elapsed. - On the other hand, as the result of the judgment of
Operation 306, if the designated time has elapsed, thecontrol unit 52 drives the first andsecond dampers damper drive unit 56 so that the air channel connected with thefirst duct 41 is completely opened and the air channel connected with thesecond duct 42 is completely closed (Operation 308). - When the first and
second dampers FIG. 17 . Thereby, air in thefirst storage chamber 21 is sucked through thesuction hole 24 b formed at the upper portion of the left side of the rear surface of thefirst storage chamber 21, and the sucked air is cooled into low-humidity and low-temperature air through theevaporator 27 and is discharged to the inside of thefirst storage chamber 21 through thedischarge hole 25 b formed at the lower portion of the right side of the rear surface of thefirst storage chamber 21. - Then, the
control unit 52 counts time for which the first andsecond dampers first duct 41 is opened (Operation 310), and judges whether or not a designated time has elapsed (Operation 312). - As a result of the judgment of
Operation 312, if the designated time has not elapsed, the process is fed back toOperation 310, thecontrol unit 52 counts time until the designated time has elapsed. - On the other hand, as the result of the judgment of
Operation 312, if the designated time has elapsed, the process is fed back toOperation 302 and thecontrol unit 52 drives the first andsecond dampers damper drive unit 56 so that the air channel of thesecond duct 41 is opened. - Through the above method, air flows in the upward direction, flows in the downward direction and then flows in the upward direction and thus the roles of the suction holes 24 a and 24 b and the discharge holes 25 a and 25 b are periodically interchanged. Thereby, cool air in the
first storage chamber 21 is uniformly distributed and thus the temperature within thefirst storage chamber 21 is uniformly maintained. - As is apparent from the above description, in a refrigerator and a control method thereof in accordance with one embodiment of the present invention, roles of suction and discharge holes are interchanged in various manners under various conditions so as to uniformly distribute a cool air flow in a storage chamber, thereby preventing local supercooling and uniformly maintaining the internal temperature of the storage chamber.
- Although a few embodiments have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (18)
1. A refrigerator comprising:
a storage chamber;
an evaporator to cool air in the storage chamber;
a first opening to suck the air in the storage chamber;
a second opening to discharge the air cooled by the evaporator to the inside of the storage chamber;
a fan provided with blades, which are driven at a first angle and a second angle; and
a control unit to adjust the direction of a flow of the air by driving the fan at the first angle so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening and by driving the fan at the second angle so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening.
2. The refrigerator according to claim 1 , wherein the first angle and the second angle are blade angles having reverse delta values.
3. The refrigerator according to claim 2 , wherein the control unit drives the fan at the first angle or the second angle so as to periodically change the direction of the air flow.
4. A refrigerator comprising:
a storage chamber;
an evaporator to cool air in the storage chamber;
a first opening to suck the air in the storage chamber;
a second opening to discharge the air cooled by the evaporator to the inside of the storage chamber;
first and second fans to respectively generate flows of the air in opposite directions; and
a control unit to adjust the direction of the air flow by driving the first fan so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening and by driving the second fan so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening.
5. The refrigerator according to claim 4 , wherein the first fan and the second fan have blade angles having reverse values.
6. The refrigerator according to claim 5 , wherein the control unit drives the first and second fans so as to periodically change the direction of the air flow.
7. A refrigerator comprising:
a storage chamber;
an evaporator to cool air in the storage chamber;
a pair of first openings to suck the air in the storage chamber;
a pair of second openings to discharge the air cooled by the evaporator to the inside of the storage chamber;
first and second ducts respectively connecting the pair of first openings and the pair of second openings to form air channels in the storage chamber;
first and second dampers installed in the first and second ducts to permit or block the air flow toward one of the first and second ducts; and
a control unit to adjust the direction of the air flow by controlling the first and second dampers so that the air flows toward one of the first and second ducts.
8. The refrigerator according to claim 7 , wherein the first and second dampers are installed at an intersection between the first and second ducts.
9. The refrigerator according to claim 8 , wherein the control unit drives the first and second dampers so as to periodically change the direction of the air flow.
10. The refrigerator according to claim 7 , further comprising a third duct at which the first duct and the second duct meet,
wherein the evaporator and a fan are installed in the third duct.
11. The refrigerator according to claim 7 , wherein the pair of first openings and the pair of second openings are respectively installed at upper and lower portions of the rear surface of the storage chamber.
12. The refrigerator according to claim 7 , wherein the pair of first openings and the pair of second openings are respectively installed at both side surfaces of the storage chamber.
13. A control method of a refrigerator, which has a storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air to the inside of the storage chamber, and a fan provided with blades, the angle of which is varied, to generate a flow of the air, comprising:
driving the fan at a first angle of the blades so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening;
judging whether or not a designated time has elapsed; and
driving the fan at a second angle of the blades so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening, upon judging that the designated time has elapsed.
14. The control method according to claim 13 , wherein the driving of the fan at the first angle of the blades and the driving of the fan at the second angle of the blades are periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
15. A control method of a refrigerator, which has a storage chamber, a first opening to suck the air in the storage chamber, a second opening to discharge the air to the inside of the storage chamber, and first and second fans to respectively generate flows of the air in opposite directions, comprising:
driving the first fan so that the air in the storage chamber is sucked through the first opening and is then discharged to the inside of the storage chamber through the second opening;
judging whether or not a designated time has elapsed; and
driving the second fan so that the air in the storage chamber is sucked through the second opening and is then discharged to the inside of the storage chamber through the first opening, upon judging that the designated time has elapsed.
16. The control method according to claim 15 , wherein the driving of the first fan and the driving of the second fan are periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
17. A control method of a refrigerator, which has a storage chamber, a pair of first openings to suck the air in the storage chamber, a pair of second openings to discharge the air to the inside of the storage chamber, first and second ducts respectively connecting the pair of first openings and the pair of second openings to form air channels in the storage chamber, and first and second dampers installed in the first and second ducts to permit or block the air flow toward one of the first and second ducts, comprising:
driving the first and second dampers so that the air flows toward one of the first and second ducts;
judging whether or not a designated time has elapsed; and
driving the first and second dampers so that the air flows toward the other one of the first and second ducts, upon judging that the designated time has elapsed.
18. The control method according to claim 17 , wherein the driving of the first and second dampers so that the air flows toward one of the first and second ducts and the driving of the first and second dampers so that the air flows toward the other one of the first and second ducts are periodically alternated so as to uniformly distribute the air flow throughout the overall space of the storage chamber.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100132638A KR20120071054A (en) | 2010-12-22 | 2010-12-22 | Refrigerator and control method thereof |
KR10-2010-0132638 | 2010-12-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120159974A1 true US20120159974A1 (en) | 2012-06-28 |
Family
ID=45315609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/313,394 Abandoned US20120159974A1 (en) | 2010-12-22 | 2011-12-07 | Refrigerator and control method thereof |
Country Status (4)
Country | Link |
---|---|
US (1) | US20120159974A1 (en) |
EP (1) | EP2469203A3 (en) |
KR (1) | KR20120071054A (en) |
CN (1) | CN102564004A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020005698A1 (en) * | 2018-06-29 | 2020-01-02 | Kason Industries, Inc. | Cold room combination vent and light |
US20200224958A1 (en) * | 2019-01-10 | 2020-07-16 | Lg Electronics Inc. | Refrigerator |
US11692770B2 (en) | 2019-01-10 | 2023-07-04 | Lg Electronics Inc. | Refrigerator |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103307852B (en) * | 2013-07-05 | 2016-09-07 | 合肥美的电冰箱有限公司 | For the box liner assembly of refrigerator and the refrigerator with it |
CH714956A2 (en) * | 2019-09-02 | 2019-11-15 | V Zug Ag | Cooling unit with opposite air flow. |
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TR201007276A2 (en) * | 2010-09-01 | 2010-11-22 | Vestel Beyaz Eşya Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇@ | A cooling device. |
-
2010
- 2010-12-22 KR KR1020100132638A patent/KR20120071054A/en not_active Application Discontinuation
-
2011
- 2011-12-07 US US13/313,394 patent/US20120159974A1/en not_active Abandoned
- 2011-12-09 EP EP11192735.6A patent/EP2469203A3/en not_active Withdrawn
- 2011-12-21 CN CN2011104509661A patent/CN102564004A/en active Pending
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US5720180A (en) * | 1994-11-11 | 1998-02-24 | Samsung Electronics Co., Ltd. | Operating control circuit for a refrigerator having high efficiency multi-evaporator cycle (H.M. cycle) |
US6537019B1 (en) * | 2000-06-06 | 2003-03-25 | Intel Corporation | Fan assembly and method |
US7630201B2 (en) * | 2005-12-14 | 2009-12-08 | Fujitsu Limited | Heat radiating apparatus and electronic apparatus |
US20080000256A1 (en) * | 2006-07-03 | 2008-01-03 | Daewoo Electronics Corporation | Cold air circulating apparatus for use in Kimchi refrigerator |
US20100115972A1 (en) * | 2007-03-30 | 2010-05-13 | Soo Kwan Lee | Refrigerator and control method of the same |
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Cited By (3)
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WO2020005698A1 (en) * | 2018-06-29 | 2020-01-02 | Kason Industries, Inc. | Cold room combination vent and light |
US20200224958A1 (en) * | 2019-01-10 | 2020-07-16 | Lg Electronics Inc. | Refrigerator |
US11692770B2 (en) | 2019-01-10 | 2023-07-04 | Lg Electronics Inc. | Refrigerator |
Also Published As
Publication number | Publication date |
---|---|
EP2469203A2 (en) | 2012-06-27 |
EP2469203A3 (en) | 2014-10-15 |
CN102564004A (en) | 2012-07-11 |
KR20120071054A (en) | 2012-07-02 |
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Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAN, JEONG SU;KA, KEE HWAN;LEE, HYO SANG;AND OTHERS;SIGNING DATES FROM 20110418 TO 20110419;REEL/FRAME:027476/0359 |
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