US3726105A - Control arrangement for automatically defrosting a refrigerator - Google Patents

Control arrangement for automatically defrosting a refrigerator Download PDF

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Publication number
US3726105A
US3726105A US00121928A US3726105DA US3726105A US 3726105 A US3726105 A US 3726105A US 00121928 A US00121928 A US 00121928A US 3726105D A US3726105D A US 3726105DA US 3726105 A US3726105 A US 3726105A
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US
United States
Prior art keywords
metal
switch means
metal switch
control arrangement
evaporator
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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.)
Expired - Lifetime
Application number
US00121928A
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English (en)
Inventor
R Auracher
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.)
Canfield Co H O GmbH
Europaeische H O Canfield Co dt GmbH
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Canfield Co H O GmbH
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 Canfield Co H O GmbH filed Critical Canfield Co H O GmbH
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Publication of US3726105A publication Critical patent/US3726105A/en
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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control

Definitions

  • the resistor is arranged in a control circuit in series with a normally straight bi-metal strip arranged adjacent the evaporator of the refrigerator to sense the temperature of the evaporator and the bi-metal strip curves to close the control circuit upon sensing of a temperature of about between 35C to thereby energize the resistor and cause closing of the bi-rnetal switch.
  • An elongated permanent magnet cooperates with the bi-metal strip to expedite closing of the latter.
  • the present invention relates to a control arrangement for automatically defrosting of refrigerators.
  • the letter In order to prevent accumulation of ice on the evaporator of the main compartment, the letter is provided with a heater which defrosts this evaporator during the time it is not in operation. Nevertheless, when the time periods during which the evaporator is not in operation are too short it is possible that ice will accumulate on the evaporator of the main compartment.
  • the present invention mainly comprises a control arrangement for automatically defrosting a refrigerator which as usual comprises an evaporator for cooling the main compartment of the refrigerator, a compressor connected to this evaporator and an electric motor for driving the compressor, and the control arrangement of the present invention comprises an electrical circuit for energizing the motor, normally open bi-metal switch means in this circuit constructed to close the circuit upon heating of this bimetal switch to a first predetermined temperature, resistor means adjacent the bi-metal switch for heating, during passage of current therethrough, the bi-metal switch to close the latter, control circuit means connected to the resistor, and second normally open bimetal switch means arranged adjacent the main evaporator and sensing the temperature of the latter in which this bi-metal switch means is constructed to close upon sensing a second predetermined temperature to thereby energize the resistor.
  • the aforementioned second bi-metal switch means are connected to the evaporator of the main compartment of the refrigerator and senses the temperature of this evaporator.
  • the second bi-metal switch closes when for instance a temperature of 3 5C is reached and closing of this second bi-metal switch means energizes the resistor.
  • the aforementioned resistor is not switched on, that is, the contacts of the first mentioned bi-metal switch in the main circuit of the refrigerator remain spaced from each other and the evaporator is not operated.
  • An additional feature according to the present invention is the arrangement of a magnet strip adjacent to the bi-metal strip of the above-mentioned second bimetal switch means.
  • This magnet strip is arranged at a distance from the bi-metal strip of the second bi-metal switch means in such a manner that the magnet strip will not influence the operation of the bi-metal strip of the second bi-metal switch means when this bi-metal strip is in substantially straight condition.
  • the magnet will become active only when the bimetal strip with its contact at one end thereof slightly curves toward the fixed contact arranged opposite the contact on the bi-metal strip. The movement into the closed position of the two contacts will then occur suddenly with a snap action since the bi-metal strip tends to move towards the closing position and this movement is supported by the attraction force of the magnet.
  • a permanent magnet is used for this purpose and especially a flexible magnet known per se.
  • the bi-metal strip of the second bi-metal switch means is constructed to close at a predetermined temperature.
  • This predetermined temperature is preferably between 3 5C above zero, but evidently this switch may be constructed to close also at other temperatures.
  • the temperature of the main evaporator of the refrigerator is constantly sensed and the motor of the compressor for feeding refrigerant into the main evaporator is only energized if the sensed temperature is above a predetermined temperature and this predetermined temperature is preferably in the region of 5C above zero.
  • FIG. 1 is a schematic illustration of the control arrangement of the present invention.
  • FIG. 2 schematically illustrates the control arrangement connected to a refrigerator.
  • the control arrangement of the present invention comprises a first bi-metal switch including the bi-metal springs 2 and 2a of which the bimetal spring 20 carries a movable contact 7 opposite of which a stationary contact 7a is arranged, and this bimetal switch is arranged in the circuit of a motor M which drives the compressor for furnishing a refrigerant to the main evaporator of the refrigerator.
  • This bi-metal switch is normally open and the contacts 7 are closed only when this bi-metal switch is heated up to a first predetermined temperature.
  • a resistor l is arranged adjacent to the springs of the mentioned bimetal switch and the resistor R is connected in series with a second bi-metal switch comprising a bi-metal strip 3 carrying at one end thereof a movable contact 4 arranged spaced from and opposite a fixed contact 5.
  • This second bi-metal switch is connected to the main evaporator of the refrigerator, and senses the temperature of this main evaporator.
  • An elongated permanent magnet 6 is arranged substantially parallel and spaced from the bi-metal strip 3.
  • the bi-metal strip 3 will stay in substantially straight condition so that the contacts 4 and 5 will be separated from each other.
  • the bi-metal strip 3 When the temperature sensed by the bi-metal strip 3 rises above the above-mentioned temperature, the bi-metal strip 3 will curve so that the contact 4 carried at one end thereof will move toward the stationary contact 5 and this movement will, after the curving has started, be supported by the attraction of the magnet 6 and therewith accelerated so that the contacts 4 and 5 will close suddenly to thereby energize the resistor 1 which in turn will heat up the springs 2 and 2a of the main bi-metal switch closing thereby the contacts 7 and 7a thereof to energize the motor of the compressor which furnishes refrigerant to the main evaporator. The temperature of the main evaporator will thereby be lowered which in turn will cause reopening of the contacts 4 and 5.
  • the main bi-metal switch When the resistor l is not energized the main bi-metal switch will stay in the position as shown in FIG. 2 to energize thereby the evaporator heater or defroster so that the evaporator is defrosted while the compressor motor is at standstill.
  • the magnet 6 is arranged at such a distance from the bi-metal strip 3 and exerts such a force on the latter so as not to prevent the reopening of the contacts 4 and 5.
  • the bi-metal strip 3 has a strip portion which is magnetizable by the magnet 6.
  • Control arrangement for a refrigerator including an evaporator for cooling the main compartment of the refrigerator and a compressor motor, said control arrangement comprisin an electric circuit for energizing the motor; first norma ly open bi-metal switch means in said circuit constructed to close said circuit upon heating of said bi-metal switch means to a first predetermined temperature; resistor means adjacent said himetal switch means for heating, during passage of current therethrough, said first bi-metal switch means to close the latter; and control circuit means connected to said resistor and comprising a second normally open bimetal switch means arranged adjacent the evaporator and sensing the temperature of said evaporator, said second bi-metal switch means being constructed to close when the temperature of said evaporator sensed by said second bi-metal switch means reaches a second predetermined temperature to thereby energize said resistor to heat said first bi-metal switch to said first predetermined temperature so as to close said first bimetal switch means.
  • said first bi-metal switch means comprises two bi-metal springs and wherein said second bi-metal switch means comprises a bi-metal strip carrying at one end a movable contact and a fixed contact normally spaced from said movable contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Thermally Actuated Switches (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US00121928A 1970-03-06 1971-03-08 Control arrangement for automatically defrosting a refrigerator Expired - Lifetime US3726105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702010717 DE2010717A1 (de) 1970-03-06 1970-03-06 Schmiervorrichtung für gekapselte Motor-Verdichter-Aggregate

Publications (1)

Publication Number Publication Date
US3726105A true US3726105A (en) 1973-04-10

Family

ID=5764354

Family Applications (1)

Application Number Title Priority Date Filing Date
US00121928A Expired - Lifetime US3726105A (en) 1970-03-06 1971-03-08 Control arrangement for automatically defrosting a refrigerator

Country Status (5)

Country Link
US (1) US3726105A (de)
CA (1) CA929254A (de)
DE (1) DE2010717A1 (de)
FR (1) FR2081752A1 (de)
GB (1) GB1345616A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834618A (en) * 1973-08-06 1974-09-10 Keens L Temperature setback control
US4530217A (en) * 1982-04-20 1985-07-23 Indesit Industrial Elettrodometici Italiana S.P.A. Defrosting device for a refrigerator
US4741169A (en) * 1987-08-06 1988-05-03 Whirlpool Corporation Ice maker safety control
US20070006600A1 (en) * 2003-04-04 2007-01-11 Bsh Bosch Und Siemens Hausgeråte Gmbh Refrigeration device with adaptive automatic defrosting and corresponding defrosting method
US20090260371A1 (en) * 2008-04-18 2009-10-22 Whirlpool Corporation Secondary cooling apparatus and method for a refrigerator
US11480383B2 (en) 2019-05-30 2022-10-25 Vestel Elektronik Sanayi Ve Ticaret A.S. Device for detecting formation of water ice

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765630A (en) * 1955-06-17 1956-10-09 Borg Warner Refrigerator air temperature control device
US3105364A (en) * 1961-04-24 1963-10-01 Gen Motors Corp Refrigerating apparatus with defrost means
US3134238A (en) * 1960-08-31 1964-05-26 Controls Co Of America Defrost control responsive to frost accumulation
US3138006A (en) * 1962-04-30 1964-06-23 Gen Motors Corp Refrigerating apparatus including defrost means
US3174297A (en) * 1962-12-24 1965-03-23 Gen Motors Corp Refrigerating apparatus with defrost control means
US3228204A (en) * 1963-07-03 1966-01-11 Controls Co Of America Refrigeration control for defrosting
US3525222A (en) * 1967-06-14 1970-08-25 Peter Schuller Electric temperature regulator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765630A (en) * 1955-06-17 1956-10-09 Borg Warner Refrigerator air temperature control device
US3134238A (en) * 1960-08-31 1964-05-26 Controls Co Of America Defrost control responsive to frost accumulation
US3105364A (en) * 1961-04-24 1963-10-01 Gen Motors Corp Refrigerating apparatus with defrost means
US3138006A (en) * 1962-04-30 1964-06-23 Gen Motors Corp Refrigerating apparatus including defrost means
US3174297A (en) * 1962-12-24 1965-03-23 Gen Motors Corp Refrigerating apparatus with defrost control means
US3228204A (en) * 1963-07-03 1966-01-11 Controls Co Of America Refrigeration control for defrosting
US3525222A (en) * 1967-06-14 1970-08-25 Peter Schuller Electric temperature regulator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834618A (en) * 1973-08-06 1974-09-10 Keens L Temperature setback control
US4530217A (en) * 1982-04-20 1985-07-23 Indesit Industrial Elettrodometici Italiana S.P.A. Defrosting device for a refrigerator
US4741169A (en) * 1987-08-06 1988-05-03 Whirlpool Corporation Ice maker safety control
US20070006600A1 (en) * 2003-04-04 2007-01-11 Bsh Bosch Und Siemens Hausgeråte Gmbh Refrigeration device with adaptive automatic defrosting and corresponding defrosting method
US20090260371A1 (en) * 2008-04-18 2009-10-22 Whirlpool Corporation Secondary cooling apparatus and method for a refrigerator
US8794026B2 (en) 2008-04-18 2014-08-05 Whirlpool Corporation Secondary cooling apparatus and method for a refrigerator
US11480383B2 (en) 2019-05-30 2022-10-25 Vestel Elektronik Sanayi Ve Ticaret A.S. Device for detecting formation of water ice

Also Published As

Publication number Publication date
DE2010717A1 (de) 1971-09-23
FR2081752A1 (de) 1971-12-10
CA929254A (en) 1973-06-26
GB1345616A (en) 1974-01-30

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