EP0034420A2 - Vorrichtung zum Löschen von Bränden in Leitungssystemen - Google Patents

Vorrichtung zum Löschen von Bränden in Leitungssystemen Download PDF

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Publication number
EP0034420A2
EP0034420A2 EP81300355A EP81300355A EP0034420A2 EP 0034420 A2 EP0034420 A2 EP 0034420A2 EP 81300355 A EP81300355 A EP 81300355A EP 81300355 A EP81300355 A EP 81300355A EP 0034420 A2 EP0034420 A2 EP 0034420A2
Authority
EP
European Patent Office
Prior art keywords
fan
ducting
fire
temperature
circuit
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.)
Withdrawn
Application number
EP81300355A
Other languages
English (en)
French (fr)
Other versions
EP0034420A3 (de
Inventor
John David Tonge
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
Publication of EP0034420A2 publication Critical patent/EP0034420A2/de
Publication of EP0034420A3 publication Critical patent/EP0034420A3/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/04—Fire prevention, containment or extinguishing specially adapted for particular objects or places for dust or loosely-baled or loosely-piled materials, e.g. in silos, in chimneys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/006—Fire prevention, containment or extinguishing specially adapted for particular objects or places for kitchens or stoves

Definitions

  • This invention relates to fire extinguishing apparatus for ducting, in particular so called grease ducts used in catering establishments and other situations where inflammable or potentially inflammable materials are extracted.
  • These ducts constitute a hazard since if a fire starts in the ducting it can spread rapidly to other parts of the building.
  • the problem is particularly severe in ducts leading from grills and griddles because the flames are often generated during cooking. Once the fire has started it is difficult immediately to detect and extinguish.
  • fire extinguishing apparatus for ducting incorporating an extractor fan and comprising a fire extinguisher having a discharge head disposed within the ducting upstream of the extraction fan and a heat sensitive valve means operable to release the fire extinguishing medium into the duct at a predetermined temperature, and a temperature sensing unit operatively connected to a circuit selector control for cutting out the fan when the unit detects a pre-set temperature less preferably by at least 90°F, than the predetermined operating temperature of the first extinguisher and including a by-pass circuit whereby the fan can be restarted following discharge of the fire extinguisher.
  • the state of the selector control circuit is displayed by an indicator light or lights and optionally an audible alarm.
  • the tempature sensing unit is disposed upstream from the fire extinguisher by no more than 3 metres and, further, comprises thermal probe extending into the interior of the ducting.
  • FIG. 1 is a schematic view of the fire extinguishing apparatus installed in a grease duct leading from a kitchen 10 to the exterior wall 12 of a building.
  • an extractor fan 16 is mounted within the ducting 18 to draw air therethrough from an inlet head 20 disposed above a cooking range 22 in the kitchen.
  • the entire extinguisher may be mounted within the duct in which case the size and shape of the extinguisher casing are such as to offer minimum resistance to the flow of air through the duct.
  • the extinguishing medium may be either a liquefied halogen gas mixture (e.g. BTM or BCF - Bromine, Chlorine, Fluorine) or MONEX (Registered Trade Mark) powder, both of which are internationally recognised and approved or, indeed, any suitable fire extinguishant.
  • BCF has the secondary advantage that it is of verylow toxicity, is pure, non-corrosive, and remains effective however long it is stored. Further, it leaves little mess or trace.
  • Monex powder is superior to other powders: it does not compact on storage and is compatible with protein foam.
  • a heat sensitive valve which is operable at a desired temperature to allowing the extinguishing medium to escape, under pressure, into the duct.
  • a temperature sensing unit 30 Upstream of the fire extinguisher and preferably spaced from the extinguisher by no more than 3.metres,.is a temperature sensing unit 30 which is mounted on the exterior of the ducting and has a probe 31, typically 10 cm to 30 cm in length, projecting radially inwards.
  • the unit 30 incorporates heat sensitive mechanism e.g. a bimetallic strip which distorts when heated until, at a pre-set temperature of at least 50 0 C less than the temperature setting of the extinguisher, an electrical switch is operated to actuate a circuit selector control 32 connected to the fan starter 35.
  • the circuit selector control 32 comprises a three position switch and two indicator lights; one red 33 and the other green 34.
  • the fan In one position of the switch corresponding to the normal operating stage, the fan is working and the green indicator light 34 is lit. When the probe operates upon reaching the pre-set temperature, the fan is cut out. When a fire has been extinguished the switch can be.passed through a neutral position to a third position in which a by-pass circuit is completed enabling the fan to be restarted.
  • the temperature sensing unit 30 actuates the fan cut-out switch at the lower temperature determined by the setting of the unit that is to say before (by a few seconds) the fire extinguisher is triggered by the heat sensitive valve, hence, the extraction system is. inoperative during discharge of the fire extinguisher and so the ducting fills with fumes, but the fumes can be cleared after the fire has been extinguished, since the selector control circuit can be used to by-pass the fan cut-out switch and the fan may be restarted.
  • the circuit selector control 32 comprises a two-position switch with an audible alarm 37 and only one indicator light 38 which is not-illuminated in the normal operating state.
  • the control activates the red light, sounds the alarm and automatically stops the fan.
  • a control circuit for the modified embodiment is shown in Figure 2 in the normal operating mode with both the light and the alarm off.
  • L 1 , L 2 and L 3 are the mains supply to the contractor coil and A,B and C are outgoing connections to the fan motor.
  • the mains supply L 3 is connected to L on the heat probe 31 and in the normal operating mode, L is connected to L R which is connected to 1, which is connected to 6, which is connected to L 1 at the fan coil.
  • the current path is L3,L,BC,3,2,5,buzzer,Ll and from BC to the light. so that both the buzzer and the light are on.
  • the key switch on the control box is turned to override the cut-out mode and the current path is now L 3 ,L,BC,3,6, L 1 and from BC to the light, so that the buzzer is off but the light is still on.
  • the apparatus of the present invention is not restricted to grease ducts. Indeed it is suitable for any duct extraction system which conveys volatile or inflammable substances such as hydro-carbons or other chemicals, sawdust, wool, cotton, paint, ink and dust.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Fire Alarms (AREA)
EP81300355A 1980-01-29 1981-01-27 Vorrichtung zum Löschen von Bränden in Leitungssystemen Withdrawn EP0034420A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8002918 1980-01-29
GB8002918 1980-01-29

Publications (2)

Publication Number Publication Date
EP0034420A2 true EP0034420A2 (de) 1981-08-26
EP0034420A3 EP0034420A3 (de) 1981-12-23

Family

ID=10510961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81300355A Withdrawn EP0034420A3 (de) 1980-01-29 1981-01-27 Vorrichtung zum Löschen von Bränden in Leitungssystemen

Country Status (5)

Country Link
EP (1) EP0034420A3 (de)
ES (1) ES8203621A1 (de)
GB (1) GB2069836B (de)
IE (1) IE50887B1 (de)
PT (1) PT72416B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1570881A3 (de) * 2004-03-04 2007-07-18 PAS Engineering GmbH & Co.KG Einrichtung und Verfahren zur Verminderung und/oder zur Vermeidung einer Rauch- und/oder Brandausbreitung in einem Kanal
WO2007097715A1 (en) * 2006-02-21 2007-08-30 Kim Lui So Controls for ventilation and exhaust ducts and fans
CN107366635A (zh) * 2017-08-31 2017-11-21 江西拓宇实业有限公司 一种负压排气系统及其控制方法
CN108800249A (zh) * 2018-06-21 2018-11-13 佛山市煜升电子有限公司 智能抽油烟机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI932135A0 (fi) * 1993-05-11 1993-05-11 Goeran Sundholm Foerfarande och anlaeggning foer brandbekaempning
CN102913969B (zh) * 2012-09-27 2015-06-24 杭州九龙厨具制造有限公司 厨房排烟系统及其灭火方法
WO2019202173A1 (es) * 2018-04-16 2019-10-24 Soriano Azorin Juan Jose Equipo extintor recargable y transportable
CN112569501B (zh) * 2021-01-13 2021-11-12 德清县德创智能技术有限公司 一种免检汽车灭火器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2813477A (en) * 1954-03-16 1957-11-19 Asa K Gaylord Safety ventilator unit
US3283827A (en) * 1964-12-08 1966-11-08 Specialties Dev Corp Hood and duct fire extinguishing system
US3433146A (en) * 1966-10-08 1969-03-18 Kenneth Sinclair Russell Grease extracting ventilating apparatus
US3448808A (en) * 1967-03-21 1969-06-10 Kidde & Co Walter Fire extinguishing system and control apparatus
US3463233A (en) * 1967-05-15 1969-08-26 Norris Industries Method of extinguishing deep fat fires
US3517746A (en) * 1968-04-24 1970-06-30 Gen Fire Extinguisher Corp Dry chemical fire extinguishing system
US3653443A (en) * 1970-09-25 1972-04-04 Walter E Dockery Fire extinguishing system for cook stoves and ranges
US3770061A (en) * 1971-11-03 1973-11-06 T Hall Air scrubber apparatus with improved fire extinguishing means

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1570881A3 (de) * 2004-03-04 2007-07-18 PAS Engineering GmbH & Co.KG Einrichtung und Verfahren zur Verminderung und/oder zur Vermeidung einer Rauch- und/oder Brandausbreitung in einem Kanal
WO2007097715A1 (en) * 2006-02-21 2007-08-30 Kim Lui So Controls for ventilation and exhaust ducts and fans
AU2007218220B2 (en) * 2006-02-21 2012-06-28 Kim Lui So Controls for ventilation and exhaust ducts and fans
CN101443595B (zh) * 2006-02-21 2012-10-10 苏剑蕾 通风、排气管道以及风扇的控制装置
CN107366635A (zh) * 2017-08-31 2017-11-21 江西拓宇实业有限公司 一种负压排气系统及其控制方法
CN107366635B (zh) * 2017-08-31 2019-08-27 江西拓宇实业有限公司 一种负压排气系统及其控制方法
CN108800249A (zh) * 2018-06-21 2018-11-13 佛山市煜升电子有限公司 智能抽油烟机

Also Published As

Publication number Publication date
ES498897A0 (es) 1982-04-16
IE810173L (en) 1981-07-29
PT72416A (en) 1981-02-01
EP0034420A3 (de) 1981-12-23
GB2069836A (en) 1981-09-03
PT72416B (en) 1982-01-05
GB2069836B (en) 1984-06-13
ES8203621A1 (es) 1982-04-16
IE50887B1 (en) 1986-08-06

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Effective date: 19821202