EP0040342B1 - Rauchmelder - Google Patents

Rauchmelder Download PDF

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Publication number
EP0040342B1
EP0040342B1 EP81103313A EP81103313A EP0040342B1 EP 0040342 B1 EP0040342 B1 EP 0040342B1 EP 81103313 A EP81103313 A EP 81103313A EP 81103313 A EP81103313 A EP 81103313A EP 0040342 B1 EP0040342 B1 EP 0040342B1
Authority
EP
European Patent Office
Prior art keywords
smoke
smoke detector
measuring chamber
openings
housing
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
EP81103313A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0040342A1 (de
Inventor
Andreas Dr. Rer. Nat. Scheidweiler
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.)
Cerberus AG
Original Assignee
Cerberus AG
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 Cerberus AG filed Critical Cerberus AG
Priority to AT81103313T priority Critical patent/ATE25438T1/de
Publication of EP0040342A1 publication Critical patent/EP0040342A1/de
Application granted granted Critical
Publication of EP0040342B1 publication Critical patent/EP0040342B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the invention relates to a smoke detector, the type defined in the preamble of claim 1.
  • Such a smoke detector is known from the bulletin of the Swiss Electrotechnical Association dated November 15, 52 (year 43, page 933). These smoke detectors are usually attached to the ceiling with a base plate.
  • Smoke detectors have proven particularly useful for detecting fires at an early stage because they respond to a fire parameter that occurs very early. In order to respond to a smoke detector, it is necessary that smoke, or physically a fire aerosol, penetrates the smoke detector. Transport problems play an important role here. The occurrence of smoke at the fire site is not sufficient to trigger the smoke detector and trigger an alarm. This also requires that a sufficient amount of smoke is transported into the measuring chamber of the smoke detector. The smoke or aerosol particles can then be detected in the measuring chamber in a known manner, e.g.
  • the scattered light optical smoke detector
  • ionization fire detector ionization fire detector
  • other methods e.g. measuring the change in conductivity, humidity or ion density of the room air.
  • the energy required to transport the smoke into the measuring chamber is in most cases supplied by the heat generated during the oxidation.
  • the measuring chamber is largely closed in order to eliminate the influence of stray light as far as possible.
  • a scatter cover is provided in the scattered light smoke detector of JP-A 52-133 797, which automatically closes the smoke entry openings as soon as the signal emitted by the photodetector exceeds a predetermined threshold value. If the signal was caused by stray light, an alarm is suppressed and the smoke inlets are automatically opened again to make the detector ready for operation again.
  • the main aim was to make the measuring chamber largely open to the surrounding atmosphere in order to achieve unimpeded entry of the fire aerosol.
  • the measuring chamber is separated from the outside atmosphere only by a lattice-like hood or a hood with relatively large lattice-like openings.
  • a major disadvantage of the previously known smoke detectors is that specially adapted detectors have to be developed for each area of application in order to ensure that the fire aerosols enter the fire detector optimally for different environmental conditions. This leads to complex manufacturing methods, an unnecessarily large inventory and unnecessary replacement of the detector inserts when the environmental conditions change at the place of use (elimination or Occurrence of dust, etc.).
  • the object of the invention is to eliminate the disadvantages of the previously known smoke detectors and, in particular, to create a smoke detector which can be easily adapted to different environmental conditions. It is also an object of the invention to enable in a structurally simple manner that the smoke detectors allow optimal entry of fire aerosol into the smoke measurement chamber under the respective environmental conditions while at the same time optimally preventing the occurrence of dust.
  • the adjusting device is designed such that the openings can only be changed by means of a special tool.
  • the annular slot is divided into an inner and an outer part by an annular web and the adjusting device is designed such that it changes the outer part of the annular slot. Further refinements of the adjusting devices are designed such that they change the inner part alone or simultaneously the inner and outer part of the annular slot.
  • a further preferred embodiment of the smoke detector according to the invention is that the adjustment device is set up in such a way that it can be changed in stages and that a marking device is provided on which the adjustment of the adjustment device can be read from the outside.
  • the ionization fire detector shown in Fig. 1 consists of a base part 1 and a detector insert 2.
  • the base part 1 has a recess on the side, which an alarm indicator lamp 3, e.g. contains a light emitting diode.
  • the detector insert 2 has a housing consisting of a cylindrical or slightly conical sleeve 4 and a lower cover 5. Between the sleeve 4 and the cover 5 there is an annular slot 13 for the entry of air into the interior of the housing.
  • a cylindrical web 12 is provided on the inside of the cover, by means of which the inflowing air is braked and blocked before it is conducted into the interior of the housing.
  • a carrier plate 6 made of insulating material is attached to the inside of the housing, on which all other components are mounted.
  • a central bore contains a metal stamp 7, which carries a disk-shaped electrode 8 with a radioactive preparation 9.
  • the center electrode 8 and the counter electrode 11 define the ionization chamber 10.
  • a known electrical circuit for evaluating the change in ion current of the chamber 10 can be attached, which can contain a reference ionization chamber which is almost completely sealed off from the outside atmosphere and which is produced in series in a known manner is connected to the ionization chamber 10.
  • the cover 5 of the housing is advantageously designed to be removable from the sleeve 4 in order to facilitate cleaning.
  • Figure 2 shows a section of a further embodiment of a fire detector with the same technical advantages, in which there is a projection 16 on the inner wall of the housing 4, which ensures a further deflection of the incoming air.
  • a displaceable cylinder 17 is located on the inside of the web 12, which either adheres to the inner wall of the cylindrical web 12 by a certain preload, or which springs (not shown) at several points on the outside of the circumference Web 12 is attached.
  • the inner inlet opening 20 of the smoke detector is changed by axially displacing the cylinder 17.
  • 12 grooves can be provided on the inside of the web, engage in the corresponding projections of the cylinder 17, or corresponding grooves can be provided on the outside of the web 12, in which corresponding projections of the fastening springs engage.
  • Figure 3 shows a section of the cross section of a further embodiment of a fire alarm with the same technical advantages, in which on the inside of the sleeve 4, a projection 16 is attached, the one causes further deflection of the incoming air.
  • a projection 16 is attached, the one causes further deflection of the incoming air.
  • grooves are provided on the web, in which corresponding projections of the cylinder ring 18 can engage.
  • the outer inlet opening 13 is changed simultaneously by the flange 19 and the inner inlet opening 20 by the upper edge of the cylinder ring 18.
  • fire detectors with an outer and inner part serving for air deflection for example the fire detector according to CH-PS 475 614, can also be designed in such a way that either the openings of the outer or inner part of the casing are made by a mechanical adjusting device can be changed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Fire Alarms (AREA)
  • Fats And Perfumes (AREA)
EP81103313A 1980-05-09 1981-05-02 Rauchmelder Expired EP0040342B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81103313T ATE25438T1 (de) 1980-05-09 1981-05-02 Rauchmelder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3641/80A CH648943A5 (de) 1980-05-09 1980-05-09 Rauchmelder.
CH3641/80 1980-05-09

Publications (2)

Publication Number Publication Date
EP0040342A1 EP0040342A1 (de) 1981-11-25
EP0040342B1 true EP0040342B1 (de) 1987-02-04

Family

ID=4260347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81103313A Expired EP0040342B1 (de) 1980-05-09 1981-05-02 Rauchmelder

Country Status (10)

Country Link
US (2) US4384488A (da)
EP (1) EP0040342B1 (da)
JP (1) JPS6033514Y2 (da)
AT (1) ATE25438T1 (da)
AU (1) AU541729B2 (da)
CA (1) CA1150381A (da)
CH (1) CH648943A5 (da)
DE (1) DE3175913D1 (da)
DK (1) DK113281A (da)
NO (1) NO153024C (da)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU573594B2 (en) * 1983-07-04 1988-06-16 Vision Systems Limited Smoke detection apparatus
EP0132969B1 (en) * 1983-07-04 1988-11-02 Martin Terence Cole Improvements relating to smoke detection apparatus
IE904564A1 (en) * 1990-12-17 1992-06-17 E I Company Ltd Smoke alarm
US5195648A (en) * 1991-10-21 1993-03-23 Harris R G Molded snap-together connector
DE4206656C1 (da) * 1992-03-03 1993-05-19 Wagner Alarm- Und Sicherungssysteme Gmbh, 3012 Langenhagen, De
US5420440A (en) * 1994-02-28 1995-05-30 Rel-Tek Corporation Optical obscruation smoke monitor having a shunt flow path located between two access ports
GB2322727A (en) * 1997-02-27 1998-09-02 Fulleon Ltd Sounder device
GB9906784D0 (en) * 1999-03-25 1999-05-19 Coventry University Enterprise Detector
RU2178919C1 (ru) * 2000-05-23 2002-01-27 Закрытое акционерное общество "АРГУС-СПЕКТР" Устройство для обнаружения пожара в помещениях с межпотолочным пространством
US8797724B2 (en) * 2012-09-11 2014-08-05 Tyco Fire & Security Gmbh Notification appliance enclosure
GB2537940B (en) 2015-05-01 2018-02-14 Thorn Security Fire detector drift compensation
EP3364389B1 (de) 2017-02-16 2019-04-17 Heim, Mark Gefahrenmelder mit abdeckbarer luftdurchtrittsöffnung
CN110322658B (zh) * 2019-08-02 2024-01-30 四川赛科安全技术有限公司 一种顶式反向进烟迷宫结构及其实现方法
US11238716B2 (en) * 2019-11-27 2022-02-01 Ningbo Weilaiying Electronic Technology Co., Ltd Photoelectric smoke fire detection and alarming method, apparatus and system
US11972676B2 (en) * 2021-10-25 2024-04-30 Honeywell International Inc. Initiating a fire response at a self-testing fire sensing device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1319526A (en) * 1919-10-21 Ventilator
US2489011A (en) * 1946-04-23 1949-11-22 Fred A Dahlin Roof ventilator
GB617037A (en) * 1946-09-26 1949-01-31 Frederick Charles Stewart Improvements in air distributor devices
US2791170A (en) * 1953-12-28 1957-05-07 Anemostat Corp Air outlet device for ventilating apparatus
US3495521A (en) * 1968-05-08 1970-02-17 Richard N Foster Manual adjustable control for air valve dampers
CH551057A (de) 1973-04-17 1974-06-28 Cerberus Ag Ionisationsfeuermelder.
US3903419A (en) * 1973-04-20 1975-09-02 Fire Alert Company Combustion products detector assembly and method of operation
JPS6042996B2 (ja) * 1975-09-11 1985-09-26 株式会社東芝 通貨取引装置
US4220862A (en) * 1978-01-13 1980-09-02 General Electric Company Ionization chamber for a smoke detector having an improved arrangement for capturing airborne combustion products
FR2430612A1 (fr) * 1978-07-05 1980-02-01 Ugon Pierre Chambre d'ionisation reglable

Also Published As

Publication number Publication date
NO811586L (no) 1981-11-10
CH648943A5 (de) 1985-04-15
EP0040342A1 (de) 1981-11-25
DK113281A (da) 1981-11-10
US4475390A (en) 1984-10-09
CA1150381A (en) 1983-07-19
US4384488A (en) 1983-05-24
JPS6033514Y2 (ja) 1985-10-05
NO153024C (no) 1986-01-02
NO153024B (no) 1985-09-23
DE3175913D1 (en) 1987-03-12
JPS5710097U (da) 1982-01-19
AU541729B2 (en) 1985-01-17
AU7011381A (en) 1981-11-12
ATE25438T1 (de) 1987-02-15

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