GB807812A - Improvements in or relating to the automatic defrosting of refrigeration apparatus - Google Patents

Improvements in or relating to the automatic defrosting of refrigeration apparatus

Info

Publication number
GB807812A
GB807812A GB771457A GB771457A GB807812A GB 807812 A GB807812 A GB 807812A GB 771457 A GB771457 A GB 771457A GB 771457 A GB771457 A GB 771457A GB 807812 A GB807812 A GB 807812A
Authority
GB
United Kingdom
Prior art keywords
motor
contact
heater
compressor
timer
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
GB771457A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB771457A priority Critical patent/GB807812A/en
Publication of GB807812A publication Critical patent/GB807812A/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
    • F25D21/008—Defroster control by timer

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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

807,812. Refrigerating. HERON, A. G. March 8, 1957, No. 7714/57. Class 29 Defrosting by an electric heater 15 is initiated by a time switch 10 driven by a high impedance motor 12 operating only during periods of refrigeration and defrosting. The time switch arm 10 is connected to a positive source P. One contact 17 is connected to earth N through a thermostat 18 and the compressor motor 19. The other contact 20 is connected on one side to earth through the high impedance motor 12, the contact of thermostat 18 remote from contact 17 and the compressor motor 19, and on the other side to earth through normally closed thermostats 13, 14, responsive to evaporator temperature and pressure respectively, and the heater 15. The impedances of the heater and compressor motor are small compared with that of the timer motor. During normal refrigeration the switch arm is at contact 17 and the compressor motor is cycled by the thermostat 18. When this is closed current flows through the contact remote from contact 17 through the motor 12 and the heater 15, but owing to the high impedance of the motor the potential drop across the heater is insufficient for it to operate. When switch 18 is open both compressor and timer motors are inoperative. On defrosting the switch arm is at contact 20 and the timer motor and heater are in parallel, while the compressor motor is in series with the timer motor and thus inoperative. A fan 19a is connected in the circuit.
GB771457A 1957-03-08 1957-03-08 Improvements in or relating to the automatic defrosting of refrigeration apparatus Expired GB807812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB771457A GB807812A (en) 1957-03-08 1957-03-08 Improvements in or relating to the automatic defrosting of refrigeration apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB771457A GB807812A (en) 1957-03-08 1957-03-08 Improvements in or relating to the automatic defrosting of refrigeration apparatus

Publications (1)

Publication Number Publication Date
GB807812A true GB807812A (en) 1959-01-21

Family

ID=9838344

Family Applications (1)

Application Number Title Priority Date Filing Date
GB771457A Expired GB807812A (en) 1957-03-08 1957-03-08 Improvements in or relating to the automatic defrosting of refrigeration apparatus

Country Status (1)

Country Link
GB (1) GB807812A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029611A (en) * 1959-11-16 1962-04-17 Gen Motors Corp Refrigerating apparatus with defrosting means
US3063250A (en) * 1960-08-19 1962-11-13 Gen Motors Corp Refrigeration apparatus with defrost control means
DE1144306B (en) * 1959-05-02 1963-02-28 Schmitz Kuehler Baierbrunn Automatic switch for electrical cooling systems
FR2587098A1 (en) * 1985-09-12 1987-03-13 Candy Elettrodomestici REFRIGERATION APPARATUS HAVING AN IMPROVED DEFROST DEVICE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1144306B (en) * 1959-05-02 1963-02-28 Schmitz Kuehler Baierbrunn Automatic switch for electrical cooling systems
US3029611A (en) * 1959-11-16 1962-04-17 Gen Motors Corp Refrigerating apparatus with defrosting means
US3063250A (en) * 1960-08-19 1962-11-13 Gen Motors Corp Refrigeration apparatus with defrost control means
FR2587098A1 (en) * 1985-09-12 1987-03-13 Candy Elettrodomestici REFRIGERATION APPARATUS HAVING AN IMPROVED DEFROST DEVICE

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