WO2001078031A1 - Detecteur d'incendie - Google Patents

Detecteur d'incendie Download PDF

Info

Publication number
WO2001078031A1
WO2001078031A1 PCT/IB2001/000591 IB0100591W WO0178031A1 WO 2001078031 A1 WO2001078031 A1 WO 2001078031A1 IB 0100591 W IB0100591 W IB 0100591W WO 0178031 A1 WO0178031 A1 WO 0178031A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
detector according
optical
printed circuit
circuit board
Prior art date
Application number
PCT/IB2001/000591
Other languages
English (en)
Inventor
Lorenzo Luterotti
Original Assignee
System Sensor Division Of Pittway Corporation
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 System Sensor Division Of Pittway Corporation filed Critical System Sensor Division Of Pittway Corporation
Priority to DK01919696T priority Critical patent/DK1272992T3/da
Priority to DE60100756T priority patent/DE60100756T2/de
Priority to CA002405713A priority patent/CA2405713A1/fr
Priority to AU2001246755A priority patent/AU2001246755A1/en
Priority to AT01919696T priority patent/ATE249668T1/de
Priority to EP01919696A priority patent/EP1272992B1/fr
Publication of WO2001078031A1 publication Critical patent/WO2001078031A1/fr
Priority to NO20024896A priority patent/NO20024896L/no

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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 present invention relates to a fire detector.
  • BACKGROUND ART Commercially available fire alarm systems generally comprise a control unit which manages peripheral units, usually sensors/detectors, over a two- wire line or by means of radio systems.
  • optical-thermal detectors ensure better coverage of a broader range of types of fire.
  • Optical sensors particularly photoelectric ones, use the principle according to which an electromagnetic radiation which is incident to a particle suspended in a fluid is partly absorbed and partly diffused by the particle.
  • the structure of these detectors comprises an optical chamber which has a box-like structure and is perimetrically formed by access ducts for the fluid; a light source, advantageously an LED, and a light receiver, advantageously a photodiode, are arranged in said chamber.
  • the fluid access ducts are provided so as to block as much as possible the penetration of ambient light in the optical chamber, in order to avoid affecting the sensing of the photodiode.
  • the transmitter is constituted by an LED which emits a light pulse in which the ratio between the width and the period is very low.
  • the light emitted by the LED is partially diffused by the particles suspended in the fluid, is detected by the photodiode, and is converted into an electrical signal which is then amplified and processed by an electronic circuit.
  • the LED and the photodiode are arranged so as to avoid a line-of-sight configuration but are arranged so that their respective emission and reception fields mutually intersect in a point which lies inside the optical chamber.
  • the aim of the present invention is to eliminate or substantially reduce the problems of conventional fire detectors.
  • an important object of the invention is to provide a fire detector which ensures manufacturing and assembly at high speed and low cost.
  • Another object is to provide a detector characterized by low sensitivity to radio-frequency noise.
  • Another important object is to provide a fire detector whose overall quality at least equals or exceeds that of conventional detectors.
  • Another object is to provide a detector by virtue of which the presence of dust inside the optical chamber, particularly dust settled on the cover, has a marginal effect on efficiency.
  • Another object is to provide a fire detector whose total height is modest and comparable with that of conventional ones.
  • a fire detector characterized in that it comprises a printed circuit board on which at least one optical transmitter and at least one optical receiver are surface-mounted with a method known commercially as SMD, said transmitter and said receiver being arranged so as to avoid a line-of-sight arrangement, their respective emission and reception fields intersecting each other, said board being associated with a box-like optical chamber which is composed of a fluid detection portion and a fluid circulation portion, said detection portion being arranged through a corresponding through hole formed in the printed circuit board and being provided with openings which are formed in the perimetric wall for the corresponding transmitters and receivers, whose respective emission and reception fields mutually intersect inside it, said circulation portion being arranged on the opposite side with respect to the detection portion and being formed perimetrically by a plurality of partitions which form access ducts for the fluid.
  • Figure 1 is a view of a fire detector according to the invention
  • Figure 2 is a sectional view of the fire detector of Figure 1
  • Figure 3 is a perspective view of the assembled internal components of the detector
  • Figure 4 is an exploded view of the components of Figure 3;
  • Figure 5 is a view of one of the components shown in Figures 3 and 4;
  • Figures 6, 7 and 8 are various views of another one of the components shown in Figures 3 and 4.
  • a fire detector according to the invention is generally designated by the reference numeral 10.
  • the detector 10 comprises a box-like body 11 which is constituted by two complementary components 11a and lib connected by a bayonet coupling and has a substantially cylindrical shape which tapers upward.
  • the tapering upper portion 12 is provided with lateral openings 13.
  • An assembly, generally designated by the reference numeral 14, is contained in the box-like body 11.
  • the assembly 14 comprises a printed circuit board 15 on which a transmitter 17, advantageously constituted by an LED, and a receiver 16, advantageously constituted by a photodiode, are surface-mounted; said receiver and said transmitter operate in the infrared part of the spectrum.
  • the transmitter 17 and the receiver 16 are arranged on the board 15 so as to avoid a line-of-sight configuration but so that the emission and reception fields mutually intersect.
  • the emission and reception fields are arranged at 45° with respect to the line-of-sight position.
  • a second LED 18, which is visible from outside, and a thermistor 19 are further arranged on the printed circuit board 15.
  • the board 15 is associated, by means of a removable interlocking coupling, with a first cover 20 for protecting the electronic components which lies perimetrically and is monolithic with an optical chamber 21.
  • the optical chamber 21 is constituted by a lower portion 22 for detection of the fluid and by an upper portion 23 for circulation of the fluid.
  • the optical chamber 21 is substantially cylindrical.
  • the detection portion 22 extends downward beyond the dimensions of the first cover 20, through a corresponding through hole 24 formed in the printed circuit board 15.
  • the detection portion 22 is further provided with two openings 25 provided in the perimetric wall 26 for the LED 17 and the photodiode 16, whose emission and reception fields accordingly intersect inside the portion 22.
  • the internal perimetric wall 26 of the lower portion 22 has tooth-like projections 27 so as to minimize the signal produced by internal reflections collected by the photodiode 16.
  • the lower portion 22 While having a substantially cylindrical configuration, the lower portion 22 is shaped with lateral recesses 28 at the openings 25 for advantageously accommodating the LED 17 and the photodiode 16.
  • the upper circulation portion 23 lies on the opposite side to where the lower portion 22 lies with respect to the first cover 20, is substantially cylindrical and is formed perimetrically by a plurality of access ducts 29 for the fluid.
  • the ducts 29 are formed by partitions 30 having a substantially V-shaped cross-section, which are arranged so that their vertices are arranged one after the other along the circular perimeter of the optical chamber 21 and lie in a direction which is substantially perpendicular to the plane of arrangement of the first cover 20.
  • the upper ends 31 of the partitions 30 are accommodated in corresponding seats 32 formed in the flat inner portion of a second cover 33 for the upper portion 23.
  • the second cover 33 has a perimetric portion 34 which lies at right angles to its plane of arrangement and is made of mesh, as required by the standards, adapted to cover the plurality of ducts 29 for controlled access of fluid inside the optical chamber 21.
  • the flat inner portion of the second cover 33 is also provided with toothlike projections 35.
  • the printed circuit board 15 is associated, with a removable interlocking coupling, with the first cover 20; the removable interlocking coupling is allowed by flexible elastic teeth 36 which protrude monolithically with respect to the first cover 20 and at right angles to its plane of arrangement.
  • the printed circuit board 15 has, in addition to the photodiode 16 and the LED 17, a second LED 18 and a thermistor 19.
  • the second LED 18 does not face the inside of the optical chamber 21 but is visible from the outside of the detector 10 because it is arranged at through holes 37 formed in the first cover 20 and in the box-like body 11.
  • the thermistor 19 is constituted by a sensitive portion 38, which in this embodiment is made of a material having a negative temperature coefficient, and is associated with a support 39 which lies at right angles to the printed circuit board 15 and passes through the optical chamber 21 and finally through a through hole 40 of the second cover 33.
  • the sensitive portion 38 is external to the optical chamber 21 but is contained within the box-like body 11 at its upper portion 12 provided with lateral openings 13.
  • the above-described detector 10 is a detector of the optical-thermal type.
  • the sensor detects the presence of the smoke by means of the emitter- receiver pair, which operates in the infrared part of the spectrum.
  • the transmitter 17 (LED) and the receiver 16 (photodiode) are arranged in the optical chamber 21 so that they are not in a line-of-sight configuration: when smoke enters the volume that corresponds to the intersection of the beam emitted by the LED 17 and of the viewing field of the photodiode 16, it diffuses part of the incident light emitted by the transmitter 17, which is detected and converted into an electrical signal (current) by the photodiode 16.
  • the thermistor 19, supported by a support 39, is arranged outside the profile of the optical chamber 21.
  • the LED 17 and the photodiode 16 can be replaced with a transmitter and a receiver which operate in the visible part of the spectrum.
  • the present invention has achieved its intended aim and objects.
  • the mechanical configuration ensures a high production and assembly rate and low-cost production, using standard electronic components.
  • this particular embodiment also allows to obtain a detector whose sensitivity to radio-frequency noise is particularly low, since the length of the connections of the various electronic components is very limited.
  • the efficiency of the production process and the low cost of the procedure do not affect the overall quality of the detector.
  • the total height of the optical chamber has been kept as great as possible, to the extent allowed by the bounding mechanical constraints, so as to space the active volume from the second cover of said chamber.
  • the materials employed, as well as the dimensions, so long as they are compatible with the contingent use may be any according to requirements.

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)
  • Fire Alarms (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Induction Machinery (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
  • Studio Devices (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

La présente invention concerne un détecteur d'incendie qui comprend une carte à circuit imprimé sur laquelle au moins un émetteur optique et au moins un récepteur optique sont montés en surface avec un procédé connu sous l'appellation commerciale CMS et agencés de façon à éviter un agencement à visibilité directe, leur émission et réception respective se croisant entre eux. Cette carte est associée à une chambre optique de type boîte composée d'une partie détection de fluide et d'une partie circulation de fluide. La partie détection est agencée à travers un trou de passage correspondant formé dans la carte à circuit imprimé et cette partie est dotée d'ouvertures formées dans les parois du périmètre des émetteurs et récepteurs correspondants, dont les champs d'émission et de réception respectifs se croisent à l'intérieur de ces parois. La partie circulation est agencée sur le côté opposé à la partie détection et est formée de façon périmétrique par une pluralité de partitions qui forment des voies d'accès destinées au fluide.
PCT/IB2001/000591 2000-04-11 2001-04-10 Detecteur d'incendie WO2001078031A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DK01919696T DK1272992T3 (da) 2000-04-11 2001-04-10 Branddetektor
DE60100756T DE60100756T2 (de) 2000-04-11 2001-04-10 Feuermelder
CA002405713A CA2405713A1 (fr) 2000-04-11 2001-04-10 Detecteur d'incendie
AU2001246755A AU2001246755A1 (en) 2000-04-11 2001-04-10 Fire detector
AT01919696T ATE249668T1 (de) 2000-04-11 2001-04-10 Feuermelder
EP01919696A EP1272992B1 (fr) 2000-04-11 2001-04-10 Detecteur d'incendie
NO20024896A NO20024896L (no) 2000-04-11 2002-10-10 Brannvarsler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000PD000083A IT1315417B1 (it) 2000-04-11 2000-04-11 Struttura di rilevatore di incendio
ITPD2000A000083 2000-04-11

Publications (1)

Publication Number Publication Date
WO2001078031A1 true WO2001078031A1 (fr) 2001-10-18

Family

ID=11451906

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/000591 WO2001078031A1 (fr) 2000-04-11 2001-04-10 Detecteur d'incendie

Country Status (14)

Country Link
EP (1) EP1272992B1 (fr)
CN (1) CN100438308C (fr)
AT (1) ATE249668T1 (fr)
AU (1) AU2001246755A1 (fr)
CA (1) CA2405713A1 (fr)
CZ (1) CZ20023374A3 (fr)
DE (1) DE60100756T2 (fr)
DK (1) DK1272992T3 (fr)
ES (1) ES2206415T3 (fr)
IT (1) IT1315417B1 (fr)
NO (1) NO20024896L (fr)
PT (1) PT1272992E (fr)
RU (1) RU2002129506A (fr)
WO (1) WO2001078031A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2404731A (en) * 2003-07-31 2005-02-09 Apollo Fire Detectors Ltd Smoke detector with a surface-mount-device (SMD) light source
EP2166520A1 (fr) * 2007-06-18 2010-03-24 Panasonic Electric Works Co., Ltd Capteur de fumée
EP2109085A3 (fr) * 2008-03-31 2011-07-06 Nohmi Bosai Ltd. Détecteur de fumée et de chaleur combiné
JP2012190306A (ja) * 2011-03-11 2012-10-04 Panasonic Corp 火災感知器
DE102012209100A1 (de) 2012-05-30 2013-12-05 Robert Bosch Gmbh Optischer Brandmelder und ein Verfahren zur Montage des optischen Brandmelders
US8970387B2 (en) 2010-04-21 2015-03-03 Sprue Safety Products Ltd. Smoke detector
JP2016099733A (ja) * 2014-11-19 2016-05-30 能美防災株式会社 光電式煙感知器
EP2614493A4 (fr) * 2010-09-07 2018-01-17 UTC Fire & Security Corporation Ensemble détecteur

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502005008318D1 (de) * 2005-03-31 2009-11-26 Grundfos Management As Tauchmotor
ITTO20060676A1 (it) 2006-09-22 2008-03-23 Elkron Spa Rivelatore di fumo
CN204390398U (zh) * 2014-10-14 2015-06-10 宁波尚泰电子有限公司 烟雾报警器
CN105245074A (zh) * 2015-11-13 2016-01-13 乐山三缘电机有限公司 一种三相异步电动机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296634A2 (fr) * 1987-06-26 1988-12-28 Siemens Aktiengesellschaft Détecteur optique de fumées en forme de cube
GB2306218A (en) * 1995-10-11 1997-04-30 Amlani Manhar Combination fire and smoke alarm
US5751218A (en) * 1996-07-19 1998-05-12 Simplex Time Recorder Company Smoke detector housing for improved smoke collection

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3117475A1 (de) * 1981-05-02 1982-11-18 Robert Bosch Gmbh, 7000 Stuttgart Elektrische antriebsvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296634A2 (fr) * 1987-06-26 1988-12-28 Siemens Aktiengesellschaft Détecteur optique de fumées en forme de cube
GB2306218A (en) * 1995-10-11 1997-04-30 Amlani Manhar Combination fire and smoke alarm
US5751218A (en) * 1996-07-19 1998-05-12 Simplex Time Recorder Company Smoke detector housing for improved smoke collection

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2404731A (en) * 2003-07-31 2005-02-09 Apollo Fire Detectors Ltd Smoke detector with a surface-mount-device (SMD) light source
GB2404731B (en) * 2003-07-31 2006-08-09 Apollo Fire Detectors Ltd Smoke detector with compact light source
EP2166520A1 (fr) * 2007-06-18 2010-03-24 Panasonic Electric Works Co., Ltd Capteur de fumée
EP2166520A4 (fr) * 2007-06-18 2011-01-12 Panasonic Elec Works Co Ltd Capteur de fumée
EP2109085A3 (fr) * 2008-03-31 2011-07-06 Nohmi Bosai Ltd. Détecteur de fumée et de chaleur combiné
US8106784B2 (en) 2008-03-31 2012-01-31 Nohmi Bosai Ltd. Combination smoke and heat detector
EP2472486A1 (fr) * 2008-03-31 2012-07-04 Nohmi Bosai Ltd. Détecteur de fumée et de chaleur combiné
US8970387B2 (en) 2010-04-21 2015-03-03 Sprue Safety Products Ltd. Smoke detector
EP2614493A4 (fr) * 2010-09-07 2018-01-17 UTC Fire & Security Corporation Ensemble détecteur
JP2012190306A (ja) * 2011-03-11 2012-10-04 Panasonic Corp 火災感知器
DE102012209100A1 (de) 2012-05-30 2013-12-05 Robert Bosch Gmbh Optischer Brandmelder und ein Verfahren zur Montage des optischen Brandmelders
JP2016099733A (ja) * 2014-11-19 2016-05-30 能美防災株式会社 光電式煙感知器

Also Published As

Publication number Publication date
DE60100756T2 (de) 2004-03-18
NO20024896L (no) 2002-12-03
NO20024896D0 (no) 2002-10-10
AU2001246755A1 (en) 2001-10-23
EP1272992B1 (fr) 2003-09-10
DE60100756D1 (de) 2003-10-16
PT1272992E (pt) 2004-02-27
CA2405713A1 (fr) 2001-10-18
CN100438308C (zh) 2008-11-26
CN1422453A (zh) 2003-06-04
CZ20023374A3 (cs) 2003-06-18
EP1272992A1 (fr) 2003-01-08
RU2002129506A (ru) 2004-03-10
DK1272992T3 (da) 2004-01-26
ES2206415T3 (es) 2004-05-16
IT1315417B1 (it) 2003-02-10
ATE249668T1 (de) 2003-09-15
ITPD20000083A1 (it) 2001-10-11

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