US20050210898A1 - Refrigerator and control method thereof - Google Patents

Refrigerator and control method thereof Download PDF

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Publication number
US20050210898A1
US20050210898A1 US10/814,799 US81479904A US2005210898A1 US 20050210898 A1 US20050210898 A1 US 20050210898A1 US 81479904 A US81479904 A US 81479904A US 2005210898 A1 US2005210898 A1 US 2005210898A1
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US
United States
Prior art keywords
expansion device
refrigerant
flow path
compartment evaporator
refrigerating compartment
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.)
Abandoned
Application number
US10/814,799
Other languages
English (en)
Inventor
Hak Gyun Bae
Eung Seo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAE, HAK GYUN, SEO, EUNG RYEOL
Priority to US11/106,488 priority Critical patent/US7441413B2/en
Publication of US20050210898A1 publication Critical patent/US20050210898A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • 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
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature
    • F25D2700/122—Sensors measuring the inside temperature of freezer compartments

Definitions

  • the present invention relates to a refrigerator, and, more particularly, to a refrigerator defined with freezing and refrigerating compartments, and equipped with independent evaporators respectively installed at the freezing and refrigerating compartments.
  • a refrigerator includes a body defined with freezing and refrigerating compartments partitioned by an intermediate partition wall. Doors are hingably coupled to the refrigerator body in front of the freezing and refrigerating compartments to open and close the freezing and refrigerating compartments, respectively.
  • An evaporator and a fan are arranged at an inner wall portion of the refrigerator body defining the freezing compartment, in order to generate cold air and to supply the generated cold air into the freezing compartment.
  • Another evaporator and another fan are arranged at an inner wall portion of the refrigerator body defining the refrigerating compartment, in order to generate cold air and to supply the generated cold air into the refrigerating compartment.
  • cold air is supplied into the freezing and refrigerating compartments in an independent fashion.
  • Such a system is called an “independent cooling system”.
  • the target cooling temperature required in the refrigerating compartment is relatively higher than that required in the freezing compartment.
  • the evaporators of the freezing and refrigerating compartments should have different evaporation temperatures, respectively.
  • expansion (pressure reduction) of a refrigerant at an upstream side from each evaporator should be carried out in such a manner that the expansion degrees at respective upstream sides from the evaporators are different from each other. Accordingly, separate expansion devices are installed at respective upstream ends of the evaporators.
  • the independent cooling system may also implement independent cooling of a selected one of the freezing and refrigerating compartments.
  • Different evaporation temperatures of the evaporators for the freezing and refrigerating compartments mean different refrigerant pressures of the evaporators.
  • Such a refrigerant pressure difference causes the refrigerant to flow through one of the evaporators in a larger quantity, so that the refrigerant may not smoothly flow through the other evaporator when the refrigerant flow path is changed.
  • Another aspect of the invention is to provide a method for controlling a refrigerator, which is capable of effectively controlling a path change valve when a flow path of a refrigerant is changed between two evaporators equipped in the refrigerator by the path change valve, thereby providing a smooth flow of the refrigerant.
  • the present invention provides a refrigerator comprising: a refrigerating compartment evaporator; a freezing compartment evaporator; a first expansion device adapted to expand a flow of a refrigerant to be introduced into the refrigerating compartment evaporator; a second expansion device adapted to expand a flow of the refrigerant to be introduced into the freezing compartment evaporator; a path change device adapted to change a flow path of the refrigerant between the first expansion device and the second expansion device; and a control unit adapted to control the path change device so that, when the refrigerant flow path is changed from the second expansion device to the first expansion device, a simultaneous opening stage causing the refrigerant to be introduced into both the first expansion device and the second expansion device is maintained for a predetermined time.
  • the present invention provides a method for controlling the refrigerator according to the above aspect of the present invention, comprising the step of: controlling the path change device when the refrigerant flow path is changed from the second expansion device to the first expansion device so that a simultaneous opening stage causing the refrigerant to be introduced into both the first expansion device and the second expansion device is maintained for a predetermined time.
  • FIG. 1 is a circuit diagram illustrating a refrigerant cycle established in a refrigerator according to an exemplary embodiment of the present invention
  • FIG. 2 is a timing chart illustrating a concept of controlling a 3-way valve in the refrigerator according to the illustrated embodiment of the present invention
  • FIG. 3 is a block diagram illustrating a control system used in the refrigerator according to the illustrated embodiment of the present invention.
  • FIG. 4 is a flow chart illustrating a method for controlling the 3-way valve to change a refrigerant flow path from a refrigerating compartment evaporator to a freezing compartment evaporator;
  • FIG. 5 is a flow chart illustrating a method for controlling the 3-way valve to change the refrigerant flow path from the freezing compartment evaporator to the refrigerating compartment evaporator.
  • FIG. 1 is a circuit diagram illustrating a refrigerant cycle established in a refrigerator according to an exemplary embodiment of the present invention.
  • a refrigerant which is discharged from a compressor 201 , may be introduced into a refrigerating compartment capillary tube 304 or a freezing compartment capillary tube 308 after passing through a condenser 302 when a flow path thereof is changed in accordance with operation of a 3-way valve 310 .
  • the 3-way valve 310 when the 3-way valve 310 is operated such that a refrigerating compartment valve 310 a thereof is closed, whereas a freezing compartment valve 310 b thereof is opened, the refrigerant emerging from the condenser 302 is introduced only into the freezing compartment evaporator 207 through the freezing compartment capillary tube 308 . In this case, cooling is carried out in the freezing compartment 220 alone.
  • the 3-way valve 310 when it is necessary to cool both the refrigerating compartment 210 and the freezing compartment 220 , the 3-way valve 310 is operated to open the refrigerating compartment valve 310 a while closing the freezing compartment valve 310 b.
  • the refrigerant emerging from the condenser 302 is introduced into the refrigerating compartment evaporator 205 and then into the freezing compartment evaporator 205 via the refrigerating compartment capillary tube 304 and a connecting capillary tube 306 .
  • the 3-way valve 310 is configured to change the refrigerant flow path in accordance with rotation of a stepping motor (not shown). That is, a refrigerant flow path, which communicates with at least one of the refrigerating compartment evaporator 205 and freezing compartment evaporator 207 , is established in accordance with rotation of the stepping motor. The change of the refrigerant flow path caused by rotation of the stepping motor will now be described with reference to FIG. 2 .
  • FIG. 2 is a timing chart illustrating a concept of controlling the 3-way valve in the refrigerator according to the illustrated embodiment of the present invention.
  • a refrigerant flow path is established when a selected one of the refrigerating compartment valve 310 a and freezing compartment valve 310 b is opened in accordance with a rotation angle of the stepping motor.
  • the rotation angle of the stepping motor is 340
  • both the refrigerating compartment valve 310 a and the freezing compartment valve 310 b are closed, so that no refrigerant flow path is established.
  • the stepping motor further rotates to about 95°, the freezing compartment valve 310 b is opened while the refrigerating compartment valve 310 b is still in the closed state thereof.
  • a refrigerant flow path is established which communicates with the freezing compartment evaporator 207 via the freezing compartment capillary tube 308 .
  • the refrigerating compartment valve 310 b is also opened. That is, a simultaneous opening stage, in which both the refrigerating compartment valve 310 a and the freezing compartment valve 310 b are opened, is established.
  • the freezing compartment valve 310 b is closed while the refrigerating compartment valve 310 a is still in the opened state thereof.
  • establishment of a desired refrigerant flow path is determined in accordance with rotation of the stepping motor adapted to control opening/closing of the 3-way valve.
  • rotation of the stepping motor adapted to control opening/closing of the 3-way valve.
  • the refrigerant can flow toward both the refrigerating compartment evaporator 205 and the freezing compartment evaporator 207 .
  • the refrigerant flows toward the freezing compartment evaporator 207 in a larger quantity because the pressure of the freezing compartment evaporator 207 is relatively higher than that of the refrigerating compartment evaporator 205 .
  • the operation mode of the refrigerator is changed from a mode for cooling the refrigerating compartment to a mode for cooling the freezing compartment alone (that is, the rotation angle of the stepping motor is changed from 195° to 95° via the range of about 154°)
  • the refrigerant concentrated to the freezing compartment evaporator 207 cannot be sufficiently supplied through the refrigerant flow path communicating with the refrigerating compartment evaporator 205 .
  • FIG. 3 is a block diagram illustrating the control system used in the refrigerator according to the illustrated embodiment of the present invention.
  • an input unit 354 and a temperature detecting unit 356 are connected to an input of a control unit 352 adapted to control the entire operation of the refrigerator.
  • the input unit 354 allows the user to set a desired target cooling temperature, a desired cooling mode, or other operating conditions.
  • the temperature detecting unit 356 detects respective temperatures of the refrigerating compartment 210 , freezing compartment 220 , refrigerating compartment evaporator 205 , and freezing compartment evaporator 207 , and other temperatures, and informs the control unit 352 of the detected temperatures. Based on the detected temperatures, the control unit 352 controls the entire cooling operation of the refrigerator.
  • the 3-way valve 310 is electrically connected to an output of the control unit 352 , along with a compressor 201 .
  • the 3-way valve 310 and compressor 201 are controlled by the control unit 352 to implement a cooling mode and achieve a target cooling temperature set by the user. Such a control operation of the control unit 352 will now be described with reference to FIGS. 4 and 5 .
  • FIG. 4 is a flow chart illustrating a method for controlling the 3-way valve to change the refrigerant flow path from the refrigerating compartment evaporator to the freezing compartment evaporator.
  • the refrigerating compartment valve 310 a is opened, whereas the freezing compartment valve 310 b is closed.
  • the refrigerating compartment 210 is cooled (Step 402 ).
  • the control unit 352 determines whether or not the freezing compartment 220 is to be cooled.
  • the control unit 352 determines whether or not the refrigerant flow path is to be changed from the refrigerating compartment 210 to the freezing compartment 220 (Step 404 ).
  • the control unit 352 changes the rotation angle of the stepping motor from 195° to 154° (Step 406 ).
  • This procedure is an intermediate procedure involved in a procedure in which the stepping motor is rotated to 95°. In accordance with the intermediate procedure, both the refrigerating compartment valve 310 a and the freezing compartment valve 310 b are opened.
  • the stepping motor is rotated to 95° without any delay in the intermediate procedure, thereby closing the refrigerating compartment valve 310 a while opening only the freezing compartment valve 310 b to cool only the freezing compartment 220 (Step 408 ).
  • the time, for which both the valves 310 a and 310 b are opened is minimized during the change of the refrigerant flow path from the refrigerating compartment 210 to the freezing compartment 220 . Accordingly, it is possible to reduce the degree of concentration of the refrigerant from the refrigerating compartment evaporator 205 to the freezing compartment evaporator 207 .
  • FIG. 5 is a flow chart illustrating a method for controlling the 3-way valve to change the refrigerant flow path from the freezing compartment evaporator to the refrigerating compartment evaporator.
  • the refrigerating compartment valve 310 a is closed, whereas the freezing compartment valve 310 b is opened.
  • the freezing compartment 220 is cooled (Step 502 ).
  • Step 504 it is then determined whether or not the refrigerant flow path is to be changed from the freezing compartment 220 to the refrigerating compartment 210 (Step 504 ).
  • the rotation angle of the stepping motor is changed from 95° to 154° (Step 506 ).
  • This procedure is an intermediate procedure involved in a procedure in which the stepping motor is rotated to 195°.
  • a simultaneous opening stage in which both the refrigerating compartment valve 310 a and the freezing compartment valve 310 b are opened, is established.
  • the simultaneous opening stage established in the intermediate procedure is continued for a predetermined time (for example, 10 seconds) in accordance with the illustrated embodiment of the present invention. That is, both the refrigerating compartment valve 310 a and the freezing compartment valve 310 b are opened for the predetermined time (Step 508 ). As both the valves 310 a and 310 b are opened for the predetermined time during the change of the refrigerant flow path from the freezing compartment 220 to the refrigerating compartment 210 , as described above, the refrigerant concentrated to the freezing compartment evaporator 220 can sufficiently flow toward the refrigerating compartment evaporator 210 .
  • a predetermined time for example, 10 seconds
  • the predetermined time for which both the refrigerating compartment valve 310 a and the freezing compartment valve 310 b are opened, upon changing the refrigerant flow path from the freezing compartment 220 to the refrigerating compartment 210 , is set to be longer than the inevitable delay time (for example, 10 seconds), in order to allow the refrigerant concentrated to the freezing compartment evaporator 220 to flow sufficiently toward the refrigerating compartment evaporator 210 .
  • the stepping motor is rotated to 195°, thereby closing the freezing compartment valve 310 b while maintaining only the refrigerating compartment valve 310 a in the opened state thereof.
  • the refrigerating compartment 210 is cooled (Step 510 ).

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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)
  • Electrically Driven Valve-Operating Means (AREA)
US10/814,799 2004-03-23 2004-04-01 Refrigerator and control method thereof Abandoned US20050210898A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/106,488 US7441413B2 (en) 2004-03-23 2005-04-15 Refrigerator and control method thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2004-19700 2004-03-23
KR20040019700 2004-03-23

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/106,488 Continuation-In-Part US7441413B2 (en) 2004-03-23 2005-04-15 Refrigerator and control method thereof

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US20050210898A1 true US20050210898A1 (en) 2005-09-29

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US10/814,799 Abandoned US20050210898A1 (en) 2004-03-23 2004-04-01 Refrigerator and control method thereof

Country Status (5)

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US (1) US20050210898A1 (de)
EP (1) EP1580496B1 (de)
KR (1) KR100648943B1 (de)
CN (1) CN1673653A (de)
DE (1) DE602004011180T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070151267A1 (en) * 2006-01-05 2007-07-05 Matsushita Electric Industrial Co., Ltd. Variable-capacity air conditioner
US20080190123A1 (en) * 2004-08-19 2008-08-14 Hisense Group Co. Ltd. Refrigerator Having Multi-Cycle Refrigeration System And Control Method Thereof
US20120023980A1 (en) * 2010-07-29 2012-02-02 Lg Electronics Inc. Refrigerator and controlling method of the same

Families Citing this family (4)

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KR100863041B1 (ko) * 2006-11-10 2008-10-13 엘지전자 주식회사 냉장고 제어방법
KR100909865B1 (ko) * 2008-01-10 2009-08-14 주식회사 성영루디스 냉장고의 냉장 냉동 사이클 제어방법
DE202009002222U1 (de) * 2009-02-16 2009-04-23 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit mehreren Fächern
KR101666428B1 (ko) * 2009-12-22 2016-10-17 삼성전자주식회사 냉장고 및 그 운전제어방법

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US20020043073A1 (en) * 2000-10-12 2002-04-18 Lg Electronics Inc. Apparatus and method for controlling refrigerating cycle of refrigerator

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080190123A1 (en) * 2004-08-19 2008-08-14 Hisense Group Co. Ltd. Refrigerator Having Multi-Cycle Refrigeration System And Control Method Thereof
US20070151267A1 (en) * 2006-01-05 2007-07-05 Matsushita Electric Industrial Co., Ltd. Variable-capacity air conditioner
US7841196B2 (en) * 2006-01-05 2010-11-30 Panasonic Corporation Variable-capacity air conditioner
US20120023980A1 (en) * 2010-07-29 2012-02-02 Lg Electronics Inc. Refrigerator and controlling method of the same
US9310105B2 (en) * 2010-07-29 2016-04-12 Lg Electronics Inc. Refrigerator and controlling method of the same

Also Published As

Publication number Publication date
DE602004011180T2 (de) 2008-12-24
DE602004011180D1 (de) 2008-02-21
KR100648943B1 (ko) 2006-11-27
CN1673653A (zh) 2005-09-28
EP1580496A2 (de) 2005-09-28
KR20060043709A (ko) 2006-05-15
EP1580496A3 (de) 2005-11-23
EP1580496B1 (de) 2008-01-09

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Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OF

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Effective date: 20040518

STCB Information on status: application discontinuation

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