GB904711A - Improved means for de-frosting refrigerating apparatus - Google Patents

Improved means for de-frosting refrigerating apparatus

Info

Publication number
GB904711A
GB904711A GB131/59A GB13159A GB904711A GB 904711 A GB904711 A GB 904711A GB 131/59 A GB131/59 A GB 131/59A GB 13159 A GB13159 A GB 13159A GB 904711 A GB904711 A GB 904711A
Authority
GB
United Kingdom
Prior art keywords
bridge
evaporator
heater
defrosting
thermistor
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.)
Expired
Application number
GB131/59A
Inventor
Stanley Howard Adcock Thompson
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.)
Parnall and Sons Ltd
Original Assignee
Parnall and Sons 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 Parnall and Sons Ltd filed Critical Parnall and Sons Ltd
Priority to GB131/59A priority Critical patent/GB904711A/en
Priority to DEP24119A priority patent/DE1129970B/en
Priority to US861375A priority patent/US3039278A/en
Priority to BE585954A priority patent/BE585954A/en
Priority to FR814602A priority patent/FR1244161A/en
Publication of GB904711A publication Critical patent/GB904711A/en
Expired legal-status Critical Current

Links

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
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • 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
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25D21/02—Detecting the presence of frost or condensate
    • F25D21/025—Detecting the presence of frost or condensate using air pressure differential detectors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • 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
    • F25B2700/11—Sensor to detect if defrost is necessary

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Defrosting Systems (AREA)

Abstract

904,711. Refrigerating. PARNALL & SONS Ltd. Dec. 22, 1959 [Jan. 2, 1959], No. 131/59. Class 29. [Also in Group XXXVI] In a refrigerating system having an evaporator associated with a fan for circulating air thereover and an electric heater for defrosting, the latter is energized in response to a decrease in the airflow past the evaporator due to accumulation of ice thereon. The heater is controlled by a relay in the output circuit of a Wheatstone bridge circuit, two arms of which are constituted by thermistors R5, R7 disposed in a casing a through which flows part of the air cooled by the evaporator. Thermistor R5 is disposed downstream of a resistance heater R2 and, when the air flow is normal, the bridge is balanced. When ice accumulates, the air flow drops and the temperature of R7 remains the same whereas that of R5 rises, thus putting the bridge out of balance and energizing the defrosting heater. At the same time the fan is stopped, the resistance heater R2 is de-energized and one arm of the bridge is replaced by a thermistor responsive to evaporator temperature. When defrosting is completed, this thermistor rises in temperature to bring the bridge back into balance and restore the system to its refrigerating condition.
GB131/59A 1959-01-02 1959-01-02 Improved means for de-frosting refrigerating apparatus Expired GB904711A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB131/59A GB904711A (en) 1959-01-02 1959-01-02 Improved means for de-frosting refrigerating apparatus
DEP24119A DE1129970B (en) 1959-01-02 1959-12-21 Defrosting device for the evaporator of a refrigeration machine
US861375A US3039278A (en) 1959-01-02 1959-12-22 Means for de-frosting refrigerating apparatus
BE585954A BE585954A (en) 1959-01-02 1959-12-23 Device perfected by to defrost a refrigeration appliance.
FR814602A FR1244161A (en) 1959-01-02 1959-12-31 Device for defrosting the evaporator block of a refrigerating appliance such as those placed in display cases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB131/59A GB904711A (en) 1959-01-02 1959-01-02 Improved means for de-frosting refrigerating apparatus

Publications (1)

Publication Number Publication Date
GB904711A true GB904711A (en) 1962-08-29

Family

ID=9698963

Family Applications (1)

Application Number Title Priority Date Filing Date
GB131/59A Expired GB904711A (en) 1959-01-02 1959-01-02 Improved means for de-frosting refrigerating apparatus

Country Status (5)

Country Link
US (1) US3039278A (en)
BE (1) BE585954A (en)
DE (1) DE1129970B (en)
FR (1) FR1244161A (en)
GB (1) GB904711A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133130A (en) * 1982-12-22 1984-07-18 Elf Aquitaine Process and device for the monitoring and control of the defrosting of an evaporator

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298189A (en) * 1962-10-23 1967-01-17 Gen Motors Corp Twistable ice cube maker with thermistor temperature sensor
US3217510A (en) * 1963-05-27 1965-11-16 Gen Motors Corp Apparatus for making and ejecting ice blocks
US3258932A (en) * 1964-08-27 1966-07-05 Puregas Equipment Corp Refrigeration air dryer
US3274790A (en) * 1965-06-09 1966-09-27 Integrated Electronics Temperature sensing control means for ice making devices
US3335576A (en) * 1965-09-15 1967-08-15 Whirlpool Co Defrost control for refrigeration apparatus
US3355904A (en) * 1966-01-21 1967-12-05 Texas Instruments Inc Differential fluid velocity sensing
US3362183A (en) * 1966-01-21 1968-01-09 Texas Instruments Inc Fluid flow control in refrigeration systems
US3465534A (en) * 1967-10-31 1969-09-09 Texas Instruments Inc Differential flow sensing apparatus
CA844775A (en) * 1967-11-09 1970-06-16 H. Ting Youn Defrost control apparatus
US3464224A (en) * 1967-12-22 1969-09-02 Clark Equipment Co Means and method for controlling a refrigeration system
US3487654A (en) * 1968-05-14 1970-01-06 Ranco Inc Deicing control apparatus for forced air refrigeration system
US3643457A (en) * 1970-11-20 1972-02-22 Westinghouse Electric Corp Frost detector for refrigeration system
US4215554A (en) * 1978-05-30 1980-08-05 General Electric Company Frost control system
US4238930A (en) * 1978-12-26 1980-12-16 Whirlpool Corporation Ice maker apparatus
IL109278A (en) * 1994-04-11 1996-08-04 Meitav Contr & Regulation Circ Defrost control system
JPH0886557A (en) * 1994-09-19 1996-04-02 Ishizuka Denshi Kk Frost detector
DE202012104835U1 (en) 2012-12-12 2013-02-11 Daniel Röder Arrangement for defrosting evaporators in freezers with at least more than one evaporator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1999930A (en) * 1929-06-27 1935-04-30 Marcus A Hirschl Defrosting
US2069782A (en) * 1933-01-30 1937-02-09 Sluman William Means for defrosting refrigerators
US2085867A (en) * 1933-09-09 1937-07-06 Servel Inc Refrigerating apparatus
US2527368A (en) * 1949-01-05 1950-10-24 Carrier Corp Defrosting equipment for refrigerator systems
US2669848A (en) * 1952-10-21 1954-02-23 Fujii Minoru Automatic refrigerating defrosting control
US2886954A (en) * 1956-07-25 1959-05-19 Joseph R Batteiger Ice making apparatus
US2962870A (en) * 1958-01-20 1960-12-06 Revco Inc Defrosting system and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133130A (en) * 1982-12-22 1984-07-18 Elf Aquitaine Process and device for the monitoring and control of the defrosting of an evaporator

Also Published As

Publication number Publication date
US3039278A (en) 1962-06-19
FR1244161A (en) 1960-10-21
DE1129970B (en) 1962-05-24
BE585954A (en) 1960-04-19

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