GB904711A - Improved means for de-frosting refrigerating apparatus - Google Patents
Improved means for de-frosting refrigerating apparatusInfo
- 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
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.
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)
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)
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 |
US3362183A (en) * | 1966-01-21 | 1968-01-09 | Texas Instruments Inc | Fluid flow control in refrigeration systems |
US3355904A (en) * | 1966-01-21 | 1967-12-05 | Texas Instruments Inc | Differential fluid velocity sensing |
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)
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 |
-
1959
- 1959-01-02 GB GB131/59A patent/GB904711A/en not_active Expired
- 1959-12-21 DE DEP24119A patent/DE1129970B/en active Pending
- 1959-12-22 US US861375A patent/US3039278A/en not_active Expired - Lifetime
- 1959-12-23 BE BE585954A patent/BE585954A/en unknown
- 1959-12-31 FR FR814602A patent/FR1244161A/en not_active Expired
Cited By (1)
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 |
---|---|
DE1129970B (en) | 1962-05-24 |
US3039278A (en) | 1962-06-19 |
FR1244161A (en) | 1960-10-21 |
BE585954A (en) | 1960-04-19 |
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