GB1399063A - Refrigeration apparatus - Google Patents
Refrigeration apparatusInfo
- Publication number
- GB1399063A GB1399063A GB4489173A GB4489173A GB1399063A GB 1399063 A GB1399063 A GB 1399063A GB 4489173 A GB4489173 A GB 4489173A GB 4489173 A GB4489173 A GB 4489173A GB 1399063 A GB1399063 A GB 1399063A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- contacts
- circuit
- consequently
- conducting
- 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
- 238000005057 refrigeration Methods 0.000 title 1
- 230000015556 catabolic process Effects 0.000 abstract 2
- 230000007423 decrease Effects 0.000 abstract 2
- 239000004020 conductor Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 238000010257 thawing Methods 0.000 abstract 1
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
- F25D21/02—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
- 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
- F25B2700/111—Sensor to detect if defrost is necessary using an emitter and receiver, e.g. sensing by emitting light or other radiation and receiving reflection by a sensor
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)
Abstract
1399063 Supply circuits for defrosting apparatus CUTLER-HAMMER EUROPA Ltd 25 Sept 1973 [29 Sept 1972] 44891/73 Heading H2H [Also in Division F4] A control circuit for a frost sensor device 10 in a refrigerator comprises A.C. supply lines L1 and L2, bi-directional thyristors Q1 and Q2, a programmable unijunction transistor Q3, a semi-conductor device such as a N-P-N transistor Q4, a thermistor PTC, a relay RC, a power transformer T, half wave rectifier diodes D1, D2, D5 and Zener diodes D3, D4. D6. Connected into the circuit are the compressor motor CM, a defrost heater H, an electric thermostat TH, and the frost sensor device 10 which comprises a photo-conductive cell 24 and a lamp 22. In operation of the compressor motor CM, frost builds up on the refrigerator cooling element 12. This results in increased illuminance in the housing 20 and consequently cell 24 decreases in resistance thereby decreasing the magnitude of voltage Vg to which gate G3 of Q3 is subjected. When voltage Vg decreases in value to Va, Q3 is turned on. Conduction of Q3 brings the potential of its anode A3 close to ground, and the potential drop across D4 exceeds its breakdown voltage to cause current to flow through relay coil RC3. Opening of contacts RC1 and closure of contacts RC2 then results. Consequently, Q1 is rendered non-conducting to de-energize motor CM, if previously energized, and Q2 is rendered conducting to energize defrost heater H. As the defrost cycle proceeds, when the temperature of thermistor PTc reaches its curie point, a sharp rise in voltage at the cathode of D6 occurs. When its voltage exceeds the breakdown voltage across D6, current will then flow from conductor 33 through resistance R8, and diode D6 into Q4. When transistor Q4 is conducting, current flowing through resistor R7 is shunted through the collector-emitter circuit of Q4 to ground, thereby shutting off current flow through relay coil RC3 and Q3- and resistors R4 and R5. Consequently, coil RC3 is de-energized and contacts RC1 reclose and contacts RC2 reopen. Accordingly, defrost heater H is de-energized and the gate circuit of Triac Q1 is again readied to effect conduction of the latter whenever the thermostat TH functions to complete the gate circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00293452A US3822560A (en) | 1972-09-29 | 1972-09-29 | Defrost sensor and control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1399063A true GB1399063A (en) | 1975-06-25 |
Family
ID=23129143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4489173A Expired GB1399063A (en) | 1972-09-29 | 1973-09-25 | Refrigeration apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3822560A (en) |
| CA (1) | CA989038A (en) |
| GB (1) | GB1399063A (en) |
| IN (1) | IN140479B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143945A (en) * | 1983-07-26 | 1985-02-20 | Agriculture Fisheries And Food | Frost sensor |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4593533A (en) * | 1974-12-05 | 1986-06-10 | Alsenz Richard H | Method and apparatus for detecting and controlling the formation of ice or frost |
| US4045971A (en) * | 1976-03-01 | 1977-09-06 | Emerson Electric Co. | Frost detector |
| US4121433A (en) * | 1977-01-26 | 1978-10-24 | P.R. Mallory & Co. Inc. | Means for sensing frost accumulation in a refrigeration mechanism |
| US4860551A (en) * | 1987-12-29 | 1989-08-29 | Whirlpool Corporation | Frost sensor for an appliance |
| JPH0886557A (en) * | 1994-09-19 | 1996-04-02 | Ishizuka Denshi Kk | Frost detector |
| US5862669A (en) * | 1996-02-15 | 1999-01-26 | Springwell Dispensers, Inc. | Thermoelectric water chiller |
| US6321555B1 (en) * | 1999-02-25 | 2001-11-27 | I.R.C.A. S.P.A Industria Resistenze | Defrosting device, in particular for refrigeration systems |
| ITRM20050634A1 (en) * | 2005-12-19 | 2007-06-20 | Ixfin S P A | SYSTEM FOR THE AUTOMATED DEFROSTING OF A REFRIGERATOR SYSTEM. |
| WO2011105717A2 (en) | 2010-02-23 | 2011-09-01 | 엘지전자 주식회사 | Refrigerator and controlling method thereof |
| CN111731071A (en) * | 2013-06-08 | 2020-10-02 | 大众汽车有限公司 | Air conditioning device for a motor vehicle and method for operating the same |
| CN104426429B (en) * | 2013-08-26 | 2019-10-18 | 森萨塔科技公司 | Positive temperature coefficient thermistor starter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3188828A (en) * | 1961-12-04 | 1965-06-15 | Chicago Aerial Ind Inc | Photo-electric ice detecting device |
| US3280577A (en) * | 1963-11-20 | 1966-10-25 | Matsushita Electric Ind Co Ltd | Automatic defrosting control device |
-
1972
- 1972-09-29 US US00293452A patent/US3822560A/en not_active Expired - Lifetime
-
1973
- 1973-07-03 IN IN1545/CAL/73A patent/IN140479B/en unknown
- 1973-07-05 CA CA175,739A patent/CA989038A/en not_active Expired
- 1973-09-25 GB GB4489173A patent/GB1399063A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143945A (en) * | 1983-07-26 | 1985-02-20 | Agriculture Fisheries And Food | Frost sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| US3822560A (en) | 1974-07-09 |
| CA989038A (en) | 1976-05-11 |
| IN140479B (en) | 1976-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |