WO2011002182A2 - Method for controlling temperature of refrigerator and refrigerator using the same - Google Patents
Method for controlling temperature of refrigerator and refrigerator using the same Download PDFInfo
- Publication number
- WO2011002182A2 WO2011002182A2 PCT/KR2010/004149 KR2010004149W WO2011002182A2 WO 2011002182 A2 WO2011002182 A2 WO 2011002182A2 KR 2010004149 W KR2010004149 W KR 2010004149W WO 2011002182 A2 WO2011002182 A2 WO 2011002182A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- chamber
- refrigerator
- cool air
- way valve
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005057 refrigeration Methods 0.000 claims abstract description 83
- 238000007710 freezing Methods 0.000 claims abstract description 70
- 230000008014 freezing Effects 0.000 claims abstract description 70
- 239000003507 refrigerant Substances 0.000 claims abstract description 28
- 238000007664 blowing Methods 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 description 6
- 238000005192 partition Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
Images
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
- F25D17/065—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators with compartments at different temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
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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
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
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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
- F25B2500/00—Problems to be solved
- F25B2500/01—Geometry problems, e.g. for reducing size
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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
- F25B2600/25—Control of valves
- F25B2600/2511—Evaporator distribution valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/042—Air treating means within refrigerated spaces
- F25D17/045—Air flow control arrangements
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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
- F25D2317/066—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 air supply
- F25D2317/0666—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 air supply from the freezer
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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
- F25D2317/066—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 air supply
- F25D2317/0667—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 air supply from the refrigerator
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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
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/04—Refrigerators with a horizontal mullion
Definitions
- the present invention relates to a method for controlling a temperature of a refrigerator, and a refrigerator having the same, and particularly, to a method for controlling inner temperatures of a freezing chamber and a refrigeration chamber by using one blowing fan, and a refrigerator having the same.
- a refrigerator is an apparatus capable of storing therein food items, etc. for a long time by maintaining an inner temperature thereof as a low temperature with using latent heat generated as a refrigerator is compressed, condensed, expanded, and evaporated.
- the refrigerant is compressed, condensed, expanded and evaporated by a compressor, a condenser, an expansion unit and an evaporator, respectively.
- the refrigerator has various types according to its purposes.
- the refrigerator generally includes a refrigeration chamber, and a freezing chamber maintained at a temperature lower than that of the refrigeration chamber.
- the refrigeration chamber and the freezing chamber have to be maintained at target temperatures.
- the temperatures of the refrigeration chamber and the freezing chamber may be independently controlled by a plurality of evaporators or blowing fans.
- an object of the present invention is to provide a method for controlling a temperature of a refrigerator capable of efficiently controlling an inner temperature of a refrigerator with a simple configuration.
- Another object of the present invention is to provide a refrigerator using the temperature control method.
- a refrigerator comprising: a refrigerator body having a refrigeration chamber and a freezing chamber; a cool air duct having suction ports and discharge ports communicated with the refrigeration chamber and the freezing chamber, respectively; a damper configured to open or close the discharge port of the refrigeration chamber; an evaporator installed in the cool air duct, and configured to heat-exchange a refrigerant and cool air with each other; a blowing fan configured to discharge the cool air to the discharge port via the evaporator; a compressor configured to compress the refrigerant; a condenser connected to the compressor; a three-way valve connected to the condenser; first and second expansion units connected to two outlets of the three-way valve, the second expansion unit having an opening degree larger than that of the first expansion unit; and a controller configured to control an open or closed state of the three-way valve according to temperatures of the freezing chamber and the refrigeration chamber.
- the present invention has been devised from a recognition that the temperature of the freezing chamber approaches to a target temperature faster than the temperature of the refrigeration chamber does because the temperature of the freezing chamber is lower than that of the refrigeration chamber. More concretely, the present invention is to supply cool air to only the freezing chamber after supplying the cool air to both of the refrigeration chamber and the freezing chamber by using the damper disposed at the discharge port of the refrigeration chamber. The temperatures of the freezing chamber and the refrigeration chamber may be efficiently controlled by one damper. Furthermore, the three-way valve disposed between the first and second expansion units may control the operation of the three-way valve. This may enhance a driving efficiency.
- the controller may be configured to open or close the discharge port of the refrigeration chamber according to the temperature of the refrigeration chamber.
- the three-way valve may be controlled to be open or closed by considering the temperature of one of the freezing chamber and the refrigeration chamber, or by considering the temperatures of both the freezing chamber and the refrigeration chamber. More concretely, when the temperature of one of the freezing chamber and the refrigeration chamber exceeds a target temperature, the three-way valve is opened with consideration of the temperature of one of the freezing chamber and the refrigeration chamber. However, when the temperatures of both the freezing chamber and the refrigeration chamber exceed target temperatures, the temperature having a larger difference from the corresponding target temperature is set as a control temperature. Then, the three-way valve may be controlled to be open or closed according to a difference between the control temperature and the target temperature.
- the controller may control the two outlets of the three-way valve to be closed. This may prevent temperature increment of the evaporator due to introduction of a high-temperature refrigerant of remaining in the compressor into the evaporator.
- the freezing chamber and the refrigeration chamber may be arranged in any forms.
- the freezing chamber and the refrigeration chamber may be arranged in upper and lower directions, and the evaporator may be arranged between the freezing chamber and the refrigeration chamber.
- the freezing chamber and the refrigeration chamber may be arranged in right and left directions, and the evaporator may be arranged between the freezing chamber and the refrigeration chamber.
- the evaporator may be disposed on a rear surface of the refrigerator body.
- the cool air duct may be disposed on a rear surface of the refrigerator body and the blowing fan may be disposed between the cool air duct and the evaporator.
- the blowing fan may be implemented as a turbo fan.
- a method for controlling a temperature of a refrigerator comprising: a refrigerator body including a freezing chamber and a refrigeration chamber; a cool air duct having a suction port and a discharge port communicated with the refrigeration chamber and the freezing chamber, respectively; an evaporator installed in the cool air duct, and configured to heat-exchange a refrigerant and cool air with each other; a blowing fan configured to discharge the cool air to the discharge port via the evaporator; a damper configured to open or close the discharge port of the refrigeration chamber; a compressor configured to compress the refrigerant; a condenser connected to the compressor; a three-way valve connected to the condenser; first and second expansion units connected to two outlets of the three-way valve, the second expansion unit having an opening degree larger than that of the first expansion unit, the method comprising: measuring temperatures of the freezing chamber and the refrigeration chamber; setting one of the measured
- the refrigerator according to the present invention is provided with a plurality of expansion units having different opening degrees, it can implement a cooling capacity variable according to the opening degrees of the plurality of expansion units.
- the opening degrees of the expansion units may be controlled according to a difference between the target temperature and the temperature of the freezing chamber or the refrigeration chamber. This may allow the temperature of the refrigerator to be efficiently controlled, and enhance a driving efficiency.
- the method may further comprise closing the two outlets of the three-way valve when the compressor is in a stopped state. This may prevent a high temperature refrigerator remaining in the compressor from being introduced into the evaporator.
- the control temperature may indicate a reference temperature for controlling the opening degrees of the expansion units based on a measured difference from the corresponding target temperature.
- This control temperature may be set as a temperature higher than the target temperature of the freezing chamber or the refrigeration chamber. If the temperatures of both the freezing chamber and the refrigeration chamber are more than target temperatures, the temperature having a larger difference from the corresponding target temperature, or an average value of the temperatures of the freezing chamber and the refrigeration chamber may be set as the control temperature.
- the step of controlling the two outlets of the three-way valve to be open or closed may include determining to which the control temperature belongs among a first temperature section where the control temperature is higher than the target temperature, a second temperature section where the control temperature is higher than the first temperature section, and a third temperature section where the control temperature is higher than the second temperature section; and controlling the three-way valve to open the first expansion unit when the control temperature belongs to the first temperature section, to open the second expansion unit when the control temperature belongs to the second temperature section, and to open the first and second expansion units when the control temperature belongs to the third temperature section.
- the present invention may have the following advantages.
- the refrigerator may have a simplified structure by controlling the temperatures of the freezing chamber and the refrigeration chamber with using one evaporator, one blowing fan and one damper.
- an optimum cooling capacity may be provided by controlling the opening degrees of the expansion units according to measured temperatures.
- power consumption may be reduced by preventing a refrigerant of a high temperature from being introduced into the evaporator by closing the three-way valve when the compressor is in a stopped state.
- FIG. 1 is a view schematically showing a configuration of a refrigeration system of a refrigerator according to an embodiment of the present invention
- FIG. 2 is a sectional view schematically showing a refrigerator to which the refrigeration system of FIG. 1 has been applied;
- FIG. 3 is a flowchart showing operational processes of the refrigerator of FIG. 2.
- FIG. 1 is a view schematically showing a configuration of a refrigeration system of a refrigerator according to an embodiment of the present invention.
- the refrigeration system comprises a compressor 10 configured to compress a refrigerant, a condenser 20 connected to a discharge port of the compressor 10, and a three-way valve 30 connected to an outlet of the condenser 20.
- a first expansion unit 40a and a second expansion unit 40b are connected to two outlets of the three-way valve 30.
- the second expansion unit 40b has an opening degree larger than that of the first expansion unit 40a.
- An evaporator 50 is disposed at an outlet of the first and second expansion units, and a blowing fan 60 is disposed near the evaporator 50. As air flows along the surface of the evaporator 50 and is heat-exchanged with a refrigerant by the blowing fan 60, cool air is generated. Since the first and second expansion units have different opening degrees, three types of flow channels may be formed according to an open or closed state of the three-way valve 30. More concretely, a refrigerant may be introduced to only the first expansion unit 40a, or to only the second expansion unit 40b, or to both of the first and second expansion units 40a and 40b.
- a cooling capacity is largest when the refrigerant is introduced to both of the first and second expansion units 40a and 40b, but is smallest when the refrigerant is introduced to only the first expansion unit 40a.
- Power consumption is maximized when a refrigerant is introduced to both of the first and second expansion units 40a and 40b, but is minimized when the refrigerant is introduced to only the first expansion unit 40a. Accordingly, when an inner temperature of the refrigerator is much higher than a target temperature, both of the first and second expansion units 40a and 40b are opened for rapid cooling. However, when a difference between the inner temperature of the refrigerator and the target temperature is not large, a refrigerant is introduced to only the first expansion unit in order to reduce power consumption. Under these configurations, an optimum driving can be performed.
- the compressor When the inner temperature of the refrigerator is in the range of a target temperature, the compressor is stopped. When the compressor is in a stopped state, a refrigerant having a relatively higher temperature and higher pressure remains in the compressor. This refrigerant of a high pressure is introduced into the evaporator via the condenser and the expansion unit, thereby increasing an inner temperature of the evaporator. This temperature increment may require an additional cooling operation by an increased temperature at the time of a subsequent driving, resulting in increase of power consumption. Accordingly, when the compressor 10 is in a stopped state, the two outlets of the three-way valve 30 are closed to prevent the refrigerant of a high temperature and a high pressure from being introduced into the evaporator.
- a valve for preventing introduction of a refrigerant, rather than the three-way valve may be additionally installed between the compressor and the condenser.
- FIG. 2 is a sectional view schematically showing a refrigerator to which the refrigeration system of FIG. 1 has been applied.
- the refrigerator 100 comprises a refrigerator body 102 having a refrigeration chamber 110 and a freezing chamber 120.
- the refrigeration chamber 110 is disposed above the freezing chamber 120.
- a cool air duct 130 having a discharge port 112 of the refrigeration chamber 110 and a discharge port 122 of the freezing chamber 120 is disposed at both ends of a rear surface of the refrigerator body 102.
- a partition wall 104 configured to separate the refrigeration chamber 110 and the freezing chamber 120 from each other is installed between the refrigeration chamber 110 and the freezing chamber 120.
- the evaporator 50 is installed in the partition wall 104, and one end of the partition wall 104 is communicated with the cool air duct 130.
- Cool air suction ports 114 and 124 communicated with the refrigeration chamber and the freezing chamber are disposed on upper and lower surfaces of another end of the partition wall 104, respectively.
- the blowing fan 60 is installed at a connection point between the partition wall 104 and the cool air duct 130.
- the blowing fan 60 is implemented in the form of a turbo fan which discharges air introduced in an axial direction to a radial direction. This may minimize a space occupied by the blowing fan 60.
- a damper 140 is installed at the discharge port 112 of the refrigeration chamber. The damper 140 is configured to be opened or closed by an actuator (not shown) such as a motor.
- a refrigeration chamber temperature (T R ) and a freezing chamber temperature (T F ) are measured (S01). Then, the measured refrigeration chamber temperature (T R ) is compared with a refrigeration chamber target temperature (T RS ) (S02). If the refrigeration chamber temperature (T R ) is higher than the refrigeration chamber target temperature (T RS ), the discharge port 112 is opened (S03). On the contrary, if the refrigeration chamber temperature (T R ) is lower than the refrigeration chamber target temperature (T RS ), the discharge port 112 is closed (S04).
- the freezing chamber temperature (T F ) is compared with a freezing chamber target temperature (T FS ) (S05). If the freezing chamber temperature (T F ) is higher than the freezing chamber target temperature (T FS ), the current step proceeds to S10 which will be later explained. On the contrary, if the freezing chamber temperature (T F ) is lower than the freezing chamber target temperature (T FS ), a difference between the refrigeration chamber temperature (T R ) and the refrigeration chamber target temperature (T RS ) is compared with a difference between the freezing chamber temperature (T F ) and the freezing chamber target temperature (T FS ) (S09).
- the freezing chamber temperature (T F ) is compared with the freezing chamber target temperature (T FS ) (S06). If the freezing chamber temperature (T F ) is higher than the freezing chamber target temperature (T FS ), the current step proceeds to S11 which will be later explained. On the contrary, if the freezing chamber temperature (T F ) is lower than the freezing chamber target temperature (T FS ), both the refrigeration chamber and the freezing chamber have temperatures less than the target temperatures. Accordingly, the compressor an the blowing fan are stopped (S07), and the three-way valve 30 is closed (S08).
- the three-way valve is opened according to a difference between the measured temperature and the target temperature.
- the opening degrees of the expansion units may be controlled to three types. Accordingly, a temperature range exceeding the target temperature is divided into first to third temperature sections, and the three-way valve is opened in correspondence to each temperature section. More concretely, when the control temperature is in the first temperature section near the target temperature, the three-way valve is opened such that a refrigerant flows to only the first expansion unit. When the control temperature is in the second temperature section, the three-way valve is opened such that a refrigerant flows to only the second expansion unit. And, when the control temperature is in the third temperature section farthest from the target temperature, the three-way valve is opened such that a refrigerant flows to both of the first and second expansion units.
- the corresponding temperature when only one of the refrigeration chamber and the freezing chamber has a temperature exceeding the target temperature, the corresponding temperature serves as the control temperature, a reference temperature. However, when both of the refrigeration chamber and the freezing chamber have temperatures exceeding the target temperatures, the corresponding temperature having a larger difference from the target temperature serves as the control temperature.
- the compressor and the blowing fan are operated in S12 to operate the refrigeration system, thereby performing a cooling operation. Then, the current step proceeds to S01, and the aforementioned processes are repeated consecutively or with a predetermined time interval.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
Disclosed are a method for controlling a temperature of a refrigerator, and a refrigerator having the same. The refrigerator comprises a refrigerator body having a refrigeration chamber and a freezing chamber, a cool air duct having suction ports and discharge ports communicated with the refrigeration chamber and the freezing chamber, respectively, a damper configured to open or close the discharge port of the refrigeration chamber, an evaporator installed in the cool air duct, and configured to heat-exchange a refrigerant and cool air with each other, a blowing fan configured to discharge the cool air to the discharge port via the evaporator, a compressor configured to compress the refrigerant, a condenser connected to the compressor, a three-way valve connected to the condenser, first and second expansion units connected to two outlets of the three-way valve, the second expansion unit having an opening degree larger than that of the first expansion unit, and a controller configured to control an open or closed state of the three-way valve according to temperatures of the freezing chamber and the refrigeration chamber.
Description
The present invention relates to a method for controlling a temperature of a refrigerator, and a refrigerator having the same, and particularly, to a method for controlling inner temperatures of a freezing chamber and a refrigeration chamber by using one blowing fan, and a refrigerator having the same.
A refrigerator is an apparatus capable of storing therein food items, etc. for a long time by maintaining an inner temperature thereof as a low temperature with using latent heat generated as a refrigerator is compressed, condensed, expanded, and evaporated. The refrigerant is compressed, condensed, expanded and evaporated by a compressor, a condenser, an expansion unit and an evaporator, respectively.
The refrigerator has various types according to its purposes. However, the refrigerator generally includes a refrigeration chamber, and a freezing chamber maintained at a temperature lower than that of the refrigeration chamber. The refrigeration chamber and the freezing chamber have to be maintained at target temperatures. The temperatures of the refrigeration chamber and the freezing chamber may be independently controlled by a plurality of evaporators or blowing fans.
However, when each of the refrigeration chamber and the freezing chamber is provided with a plurality of evaporators or blowing fans, an effective capacity inside the refrigerator may be decreased and the fabrication costs may be increased.
On the contrary, when the number of the evaporators or blowing fans is reduced, temperature controls may not be precisely performed even if the effective capacity may be increased and the fabrication costs may be reduced.
Therefore, an object of the present invention is to provide a method for controlling a temperature of a refrigerator capable of efficiently controlling an inner temperature of a refrigerator with a simple configuration.
Another object of the present invention is to provide a refrigerator using the temperature control method.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a refrigerator, comprising: a refrigerator body having a refrigeration chamber and a freezing chamber; a cool air duct having suction ports and discharge ports communicated with the refrigeration chamber and the freezing chamber, respectively; a damper configured to open or close the discharge port of the refrigeration chamber; an evaporator installed in the cool air duct, and configured to heat-exchange a refrigerant and cool air with each other; a blowing fan configured to discharge the cool air to the discharge port via the evaporator; a compressor configured to compress the refrigerant; a condenser connected to the compressor; a three-way valve connected to the condenser; first and second expansion units connected to two outlets of the three-way valve, the second expansion unit having an opening degree larger than that of the first expansion unit; and a controller configured to control an open or closed state of the three-way valve according to temperatures of the freezing chamber and the refrigeration chamber.
The present invention has been devised from a recognition that the temperature of the freezing chamber approaches to a target temperature faster than the temperature of the refrigeration chamber does because the temperature of the freezing chamber is lower than that of the refrigeration chamber. More concretely, the present invention is to supply cool air to only the freezing chamber after supplying the cool air to both of the refrigeration chamber and the freezing chamber by using the damper disposed at the discharge port of the refrigeration chamber. The temperatures of the freezing chamber and the refrigeration chamber may be efficiently controlled by one damper. Furthermore, the three-way valve disposed between the first and second expansion units may control the operation of the three-way valve. This may enhance a driving efficiency.
The controller may be configured to open or close the discharge port of the refrigeration chamber according to the temperature of the refrigeration chamber.
The three-way valve may be controlled to be open or closed by considering the temperature of one of the freezing chamber and the refrigeration chamber, or by considering the temperatures of both the freezing chamber and the refrigeration chamber. More concretely, when the temperature of one of the freezing chamber and the refrigeration chamber exceeds a target temperature, the three-way valve is opened with consideration of the temperature of one of the freezing chamber and the refrigeration chamber. However, when the temperatures of both the freezing chamber and the refrigeration chamber exceed target temperatures, the temperature having a larger difference from the corresponding target temperature is set as a control temperature. Then, the three-way valve may be controlled to be open or closed according to a difference between the control temperature and the target temperature.
When the compressor is in a stopped state, the controller may control the two outlets of the three-way valve to be closed. This may prevent temperature increment of the evaporator due to introduction of a high-temperature refrigerant of remaining in the compressor into the evaporator.
The freezing chamber and the refrigeration chamber may be arranged in any forms. For instance, the freezing chamber and the refrigeration chamber may be arranged in upper and lower directions, and the evaporator may be arranged between the freezing chamber and the refrigeration chamber. Alternatively, the freezing chamber and the refrigeration chamber may be arranged in right and left directions, and the evaporator may be arranged between the freezing chamber and the refrigeration chamber. The evaporator may be disposed on a rear surface of the refrigerator body.
The cool air duct may be disposed on a rear surface of the refrigerator body and the blowing fan may be disposed between the cool air duct and the evaporator. The blowing fan may be implemented as a turbo fan.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is also provided a method for controlling a temperature of a refrigerator comprising: a refrigerator body including a freezing chamber and a refrigeration chamber; a cool air duct having a suction port and a discharge port communicated with the refrigeration chamber and the freezing chamber, respectively; an evaporator installed in the cool air duct, and configured to heat-exchange a refrigerant and cool air with each other; a blowing fan configured to discharge the cool air to the discharge port via the evaporator; a damper configured to open or close the discharge port of the refrigeration chamber; a compressor configured to compress the refrigerant; a condenser connected to the compressor; a three-way valve connected to the condenser; first and second expansion units connected to two outlets of the three-way valve, the second expansion unit having an opening degree larger than that of the first expansion unit, the method comprising: measuring temperatures of the freezing chamber and the refrigeration chamber; setting one of the measured temperatures of the freezing chamber and the refrigeration chamber as a control temperature; controlling the two outlets of the three-way valve to be open or closed according to a difference between the control temperature and a target temperature of the corresponding chamber; supplying cool air to the cool air duct by driving the compressor and the blowing fan; and opening or closing the discharge port by controlling the damper according to the measured temperature of the refrigeration chamber.
Since the refrigerator according to the present invention is provided with a plurality of expansion units having different opening degrees, it can implement a cooling capacity variable according to the opening degrees of the plurality of expansion units. The opening degrees of the expansion units may be controlled according to a difference between the target temperature and the temperature of the freezing chamber or the refrigeration chamber. This may allow the temperature of the refrigerator to be efficiently controlled, and enhance a driving efficiency.
The method may further comprise closing the two outlets of the three-way valve when the compressor is in a stopped state. This may prevent a high temperature refrigerator remaining in the compressor from being introduced into the evaporator.
The control temperature may indicate a reference temperature for controlling the opening degrees of the expansion units based on a measured difference from the corresponding target temperature. This control temperature may be set as a temperature higher than the target temperature of the freezing chamber or the refrigeration chamber. If the temperatures of both the freezing chamber and the refrigeration chamber are more than target temperatures, the temperature having a larger difference from the corresponding target temperature, or an average value of the temperatures of the freezing chamber and the refrigeration chamber may be set as the control temperature.
The step of controlling the two outlets of the three-way valve to be open or closed may include determining to which the control temperature belongs among a first temperature section where the control temperature is higher than the target temperature, a second temperature section where the control temperature is higher than the first temperature section, and a third temperature section where the control temperature is higher than the second temperature section; and controlling the three-way valve to open the first expansion unit when the control temperature belongs to the first temperature section, to open the second expansion unit when the control temperature belongs to the second temperature section, and to open the first and second expansion units when the control temperature belongs to the third temperature section.
The present invention may have the following advantages.
Firstly, the refrigerator may have a simplified structure by controlling the temperatures of the freezing chamber and the refrigeration chamber with using one evaporator, one blowing fan and one damper.
Secondly, an optimum cooling capacity may be provided by controlling the opening degrees of the expansion units according to measured temperatures.
Thirdly, power consumption may be reduced by preventing a refrigerant of a high temperature from being introduced into the evaporator by closing the three-way valve when the compressor is in a stopped state.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
In the drawings:
FIG. 1 is a view schematically showing a configuration of a refrigeration system of a refrigerator according to an embodiment of the present invention;
FIG. 2 is a sectional view schematically showing a refrigerator to which the refrigeration system of FIG. 1 has been applied; and
FIG. 3 is a flowchart showing operational processes of the refrigerator of FIG. 2.
Description will now be given in detail of the present invention, with reference to the accompanying drawings.
For the sake of brief description with reference to the drawings, the same or equivalent components will be provided with the same reference numbers, and description thereof will not be repeated.
Hereinafter, a preferred embodiment of a method for controlling a temperature of a refrigerator and a refrigerator using the same will be explained.
FIG. 1 is a view schematically showing a configuration of a refrigeration system of a refrigerator according to an embodiment of the present invention.
Referring to FIG. 1, the refrigeration system comprises a compressor 10 configured to compress a refrigerant, a condenser 20 connected to a discharge port of the compressor 10, and a three-way valve 30 connected to an outlet of the condenser 20. A first expansion unit 40a and a second expansion unit 40b are connected to two outlets of the three-way valve 30. The second expansion unit 40b has an opening degree larger than that of the first expansion unit 40a.
An evaporator 50 is disposed at an outlet of the first and second expansion units, and a blowing fan 60 is disposed near the evaporator 50. As air flows along the surface of the evaporator 50 and is heat-exchanged with a refrigerant by the blowing fan 60, cool air is generated. Since the first and second expansion units have different opening degrees, three types of flow channels may be formed according to an open or closed state of the three-way valve 30. More concretely, a refrigerant may be introduced to only the first expansion unit 40a, or to only the second expansion unit 40b, or to both of the first and second expansion units 40a and 40b.
A cooling capacity is largest when the refrigerant is introduced to both of the first and second expansion units 40a and 40b, but is smallest when the refrigerant is introduced to only the first expansion unit 40a. Power consumption is maximized when a refrigerant is introduced to both of the first and second expansion units 40a and 40b, but is minimized when the refrigerant is introduced to only the first expansion unit 40a. Accordingly, when an inner temperature of the refrigerator is much higher than a target temperature, both of the first and second expansion units 40a and 40b are opened for rapid cooling. However, when a difference between the inner temperature of the refrigerator and the target temperature is not large, a refrigerant is introduced to only the first expansion unit in order to reduce power consumption. Under these configurations, an optimum driving can be performed.
When the inner temperature of the refrigerator is in the range of a target temperature, the compressor is stopped. When the compressor is in a stopped state, a refrigerant having a relatively higher temperature and higher pressure remains in the compressor. This refrigerant of a high pressure is introduced into the evaporator via the condenser and the expansion unit, thereby increasing an inner temperature of the evaporator. This temperature increment may require an additional cooling operation by an increased temperature at the time of a subsequent driving, resulting in increase of power consumption. Accordingly, when the compressor 10 is in a stopped state, the two outlets of the three-way valve 30 are closed to prevent the refrigerant of a high temperature and a high pressure from being introduced into the evaporator.
A valve for preventing introduction of a refrigerant, rather than the three-way valve may be additionally installed between the compressor and the condenser.
FIG. 2 is a sectional view schematically showing a refrigerator to which the refrigeration system of FIG. 1 has been applied. Referring to FIG. 2, the refrigerator 100 comprises a refrigerator body 102 having a refrigeration chamber 110 and a freezing chamber 120. The refrigeration chamber 110 is disposed above the freezing chamber 120.
A cool air duct 130 having a discharge port 112 of the refrigeration chamber 110 and a discharge port 122 of the freezing chamber 120 is disposed at both ends of a rear surface of the refrigerator body 102. A partition wall 104 configured to separate the refrigeration chamber 110 and the freezing chamber 120 from each other is installed between the refrigeration chamber 110 and the freezing chamber 120. The evaporator 50 is installed in the partition wall 104, and one end of the partition wall 104 is communicated with the cool air duct 130. Cool air suction ports 114 and 124 communicated with the refrigeration chamber and the freezing chamber are disposed on upper and lower surfaces of another end of the partition wall 104, respectively.
The blowing fan 60 is installed at a connection point between the partition wall 104 and the cool air duct 130. The blowing fan 60 is implemented in the form of a turbo fan which discharges air introduced in an axial direction to a radial direction. This may minimize a space occupied by the blowing fan 60. A damper 140 is installed at the discharge port 112 of the refrigeration chamber. The damper 140 is configured to be opened or closed by an actuator (not shown) such as a motor.
Hereinafter, the operation for controlling the temperature of the refrigerator according to the present invention will be explained.
Referring to FIG. 3, a refrigeration chamber temperature (TR) and a freezing chamber temperature (TF) are measured (S01). Then, the measured refrigeration chamber temperature (TR) is compared with a refrigeration chamber target temperature (TRS) (S02). If the refrigeration chamber temperature (TR) is higher than the refrigeration chamber target temperature (TRS), the discharge port 112 is opened (S03). On the contrary, if the refrigeration chamber temperature (TR) is lower than the refrigeration chamber target temperature (TRS), the discharge port 112 is closed (S04).
In a state that the discharge port 112 has been opened, the freezing chamber temperature (TF) is compared with a freezing chamber target temperature (TFS) (S05). If the freezing chamber temperature (TF) is higher than the freezing chamber target temperature (TFS), the current step proceeds to S10 which will be later explained. On the contrary, if the freezing chamber temperature (TF) is lower than the freezing chamber target temperature (TFS), a difference between the refrigeration chamber temperature (TR) and the refrigeration chamber target temperature (TRS) is compared with a difference between the freezing chamber temperature (TF) and the freezing chamber target temperature (TFS) (S09).
In a state that the discharge port 112 has been closed, the freezing chamber temperature (TF) is compared with the freezing chamber target temperature (TFS) (S06). If the freezing chamber temperature (TF) is higher than the freezing chamber target temperature (TFS), the current step proceeds to S11 which will be later explained. On the contrary, if the freezing chamber temperature (TF) is lower than the freezing chamber target temperature (TFS), both the refrigeration chamber and the freezing chamber have temperatures less than the target temperatures. Accordingly, the compressor an the blowing fan are stopped (S07), and the three-way valve 30 is closed (S08).
In S10 and S11, the three-way valve is opened according to a difference between the measured temperature and the target temperature. As aforementioned, the opening degrees of the expansion units may be controlled to three types. Accordingly, a temperature range exceeding the target temperature is divided into first to third temperature sections, and the three-way valve is opened in correspondence to each temperature section. More concretely, when the control temperature is in the first temperature section near the target temperature, the three-way valve is opened such that a refrigerant flows to only the first expansion unit. When the control temperature is in the second temperature section, the three-way valve is opened such that a refrigerant flows to only the second expansion unit. And, when the control temperature is in the third temperature section farthest from the target temperature, the three-way valve is opened such that a refrigerant flows to both of the first and second expansion units.
Here, when only one of the refrigeration chamber and the freezing chamber has a temperature exceeding the target temperature, the corresponding temperature serves as the control temperature, a reference temperature. However, when both of the refrigeration chamber and the freezing chamber have temperatures exceeding the target temperatures, the corresponding temperature having a larger difference from the target temperature serves as the control temperature.
Once the three-way valve has been opened, the compressor and the blowing fan are operated in S12 to operate the refrigeration system, thereby performing a cooling operation. Then, the current step proceeds to S01, and the aforementioned processes are repeated consecutively or with a predetermined time interval.
The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present disclosure. The present teachings can be readily applied to other types of apparatuses. This description is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and/or alternative exemplary embodiments.
As the present features may be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds are therefore intended to be embraced by the appended claims.
Claims (11)
- A refrigerator, comprising:a refrigerator body having a refrigeration chamber and a freezing chamber;a cool air duct having suction ports and discharge ports communicated with the refrigeration chamber and the freezing chamber, respectively;a damper configured to open or close the discharge port of the refrigeration chamber;an evaporator installed in the cool air duct, and configured to heat-exchange a refrigerant and cool air with each other;a blowing fan configured to discharge the cool air to the discharge port via the evaporator;a compressor configured to compress the refrigerant;a condenser connected to the compressor;a three-way valve connected to the condenser;first and second expansion units connected to two outlets of the three-way valve, the second expansion unit having an opening degree larger than that of the first expansion unit; anda controller configured to control an open or closed state of the three-way valve according to temperatures of the freezing chamber and the refrigeration chamber.
- The refrigerator of claim 1, wherein the controller is configured to open or close the discharge port of the refrigeration chamber according to the temperature of the refrigeration chamber.
- The refrigerator of claim 1, wherein if the temperatures of both the freezing chamber and the refrigeration chamber exceed target temperatures, the controller sets the temperature having a larger difference from the corresponding target temperature as a control temperature, and controls an opened or closed state of the three-way valve according to a difference between the control temperature and the target temperature.
- The refrigerator of claim 3, wherein if the compressor is in a stopped state, the controller closes the two outlets of the three-way valve.
- The refrigerator of claim 1, wherein the freezing chamber and the refrigeration chamber are arranged in upper and lower directions, and the evaporator is arranged between the freezing chamber and the refrigeration chamber.
- The refrigerator of claim 5, wherein the cool air duct is disposed on a rear surface of the refrigerator body, and the blowing fan is disposed between the cool air duct and the evaporator.
- The refrigerator of claim 6, wherein the blowing fan is implemented as a turbo fan.
- A method for controlling a temperature of a refrigerator comprising: a refrigerator body including a freezing chamber and a refrigeration chamber; a cool air duct having suction ports and discharge ports communicated with the refrigeration chamber and the freezing chamber, respectively; an evaporator installed in the cool air duct, and configured to heat-exchange a refrigerant and cool air with each other; a blowing fan configured to discharge the cool air to the discharge port via the evaporator; a damper configured to open or close the discharge port of the refrigeration chamber; a compressor configured to compress the refrigerant; a condenser connected to the compressor; a three-way valve connected to the condenser; first and second expansion units connected to two outlets of the three-way valve, the second expansion unit having an opening degree larger than that of the first expansion unit,the method comprising:measuring temperatures of the freezing chamber and the refrigeration chamber;setting one of the measured temperatures of the freezing chamber and the refrigeration chamber as a control temperature;controlling the two outlets of the three-way valve to be open or closed according to a difference between the control temperature and a target temperature of the corresponding chamber;supplying cool air to the cool air duct by driving the compressor and the blowing fan; andopening or closing the discharge port by controlling the damper according to the measured temperature of the refrigeration chamber.
- The method of claim 8, further comprising closing the two outlets of the three-way valve when the compressor is in a stopped state.
- The method of claim 8, wherein if the temperatures of both the freezing chamber and the refrigeration chamber are more than target temperatures, the temperature having a larger difference from the corresponding target temperature is set as the control temperature.
- The method of claim 10, wherein the step of controlling the two outlets of the three-way valve to be open or closed comprises:determining to which the control temperature belongs among a first temperature section where the control temperature is higher than the target temperature, a second temperature section where the control temperature is higher than the first temperature section, and a third temperature section where the control temperature is higher than the second temperature section; andcontrolling the three-way valve to open the first expansion unit when the control temperature belongs to the first temperature section, to open the second expansion unit when the control temperature belongs to the second temperature section, and to open the first and second expansion units when the control temperature belongs to the third temperature section.
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CN2010800276153A CN102460048A (en) | 2009-06-30 | 2010-06-25 | Method for controlling temperature of refrigerator and refrigerator using the same |
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KR1020090059358A KR101641225B1 (en) | 2009-06-30 | 2009-06-30 | Method for controlling temperature of refrigerator and the refrigerator using the same |
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Cited By (2)
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EP3187801A4 (en) * | 2014-08-29 | 2018-03-07 | Qingdao Haier Smart Technology R&D Co., Ltd. | Refrigerator |
US11686521B2 (en) | 2016-09-29 | 2023-06-27 | Lg Electronics Inc. | Refrigerator |
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CN104266434B (en) * | 2014-10-17 | 2016-04-13 | 上海智城分析仪器制造有限公司 | There is the refrigerator of edible fungus culturing function |
US10941969B2 (en) | 2015-12-15 | 2021-03-09 | Lg Electronics Inc. | Refrigerator having a cold air supply means and control method therefore |
KR102630533B1 (en) * | 2017-02-20 | 2024-01-29 | 엘지전자 주식회사 | Refrigerator and method for controlling the same |
KR102418005B1 (en) | 2017-08-28 | 2022-07-07 | 삼성전자주식회사 | Refrigerator and controlling method thereof |
CN114484990B (en) * | 2022-02-07 | 2024-03-22 | 海信冰箱有限公司 | Refrigerator and mute control method thereof |
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JP2002195733A (en) * | 2000-12-25 | 2002-07-10 | Matsushita Refrig Co Ltd | Refrigerator |
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2009
- 2009-06-30 KR KR1020090059358A patent/KR101641225B1/en active IP Right Grant
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- 2010-06-25 WO PCT/KR2010/004149 patent/WO2011002182A2/en active Application Filing
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JP2002195733A (en) * | 2000-12-25 | 2002-07-10 | Matsushita Refrig Co Ltd | Refrigerator |
JP2003042628A (en) * | 2001-08-02 | 2003-02-13 | Mitsubishi Electric Corp | Refrigerator, operating method of refrigerator, failure diagnostic method of refrigerator |
JP2004293820A (en) * | 2003-03-25 | 2004-10-21 | Mitsubishi Electric Corp | Refrigerator |
JP2006125843A (en) * | 2006-02-03 | 2006-05-18 | Matsushita Refrig Co Ltd | Cooling cycle and refrigerator |
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EP3187801A4 (en) * | 2014-08-29 | 2018-03-07 | Qingdao Haier Smart Technology R&D Co., Ltd. | Refrigerator |
AU2014404815B2 (en) * | 2014-08-29 | 2019-03-07 | Qingdao Haier Smart Technology R&D Co., Ltd. | Refrigerator |
US11686521B2 (en) | 2016-09-29 | 2023-06-27 | Lg Electronics Inc. | Refrigerator |
Also Published As
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CN102460048A (en) | 2012-05-16 |
WO2011002182A3 (en) | 2011-03-24 |
KR101641225B1 (en) | 2016-07-20 |
KR20110001698A (en) | 2011-01-06 |
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