WO2008124875A1 - Avertisseurs de fuite de gaz - Google Patents

Avertisseurs de fuite de gaz Download PDF

Info

Publication number
WO2008124875A1
WO2008124875A1 PCT/AU2008/000516 AU2008000516W WO2008124875A1 WO 2008124875 A1 WO2008124875 A1 WO 2008124875A1 AU 2008000516 W AU2008000516 W AU 2008000516W WO 2008124875 A1 WO2008124875 A1 WO 2008124875A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
alarm
sensor
unit
detected
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.)
Ceased
Application number
PCT/AU2008/000516
Other languages
English (en)
Inventor
Kevin Robert Barber
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
Priority claimed from AU2007901934A external-priority patent/AU2007901934A0/en
Application filed by Individual filed Critical Individual
Publication of WO2008124875A1 publication Critical patent/WO2008124875A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
    • G08B21/16—Combustible gas alarms

Definitions

  • This invention relates to gas alarms and in particular to alarms which can be located in an area where a gas appliance is or may be used, or gas stored, to provide an alarm should there be any escaping gas detected and which, at the same time, is safe to have in such an area.
  • the object of the invention is to provide such a detector.
  • the invention includes a gas alarm comprising a unit adapted to be connected to an electrical power source which includes therein a sensor unit for the type of gas to be detected, power supply means to operate a heater coil in the sensor and the remaining circuitry, means whereby when the output of the sensor indicates the presence of the gas to be detected to cause operation of a warning device.
  • the alarm can be used in different circumstances, such as in enclosed building spaces and motor vehicles and can be adapted to ascertain the presence or various gasses,
  • the device includes test means whereby the operation of the device can be checked and it may also include a fan to ensure that air from the surround is fed into the sensor.
  • Fig 1 Shows an external view of a first embodiment of the alarm connected to a standard power point
  • Fig 2 Shows a plan view of the embodiment of Fig 1 ; and Fig 3 Shows the operating circuit of the sensor element.
  • the alarm can be used for sensing the presence of a gas and for domestic and industrial areas this would be natural gas or LPG although in some areas methane could be used as could coal gas.
  • the operation of the alarm can be considered to be similar for each of these but the actual operating parameters of the detector, or even the type of detector itself, could be adapted to changed to suit the particular gas type to be monitored.
  • the alarm has a casing 10 of a moulded plastics material having associated therewith pins 11 for direct connection to a general purpose outlet 20. If required, there could be provided a flexible conductor connected into the alarm and having a plug on the end thereof for connection to an outlet.
  • the input power passes through a transformer to provide a required output voltage and there is then preferably a rectification and smoothing circuit to provide a constant voltage, and one particular example, a 9-volt regulated voltage. If required the power supply may have two output voltages as will be described later herein.
  • the sensor device 15 may be a commercially-available device and in general terms such devices comprise a sintered-bulk semi-conductor which have a heating coil 16 located therein, the arrangement being such that if air containing a combustible gas is passed through the sensor element, the gas will be burnt by the heating element and the temperature in device will rise, causing a variation in resistance of the semi-conductor and effectively a change in an output voltage V RL across a load R L .
  • the power supply could provide more than one voltage and as can be seen from Rg 3 the heater 16 may use a voltage V H and the operating circuit a voltage V c .
  • the change in the voltage V RL can be ascertained by a detector circuit and indicates an alarm condition, when the change reaches a pre-determined value. This, in turn, will initiate an operation of an alarm device which may be both audible and visible.
  • the alarm device can be a Piezo horn which has an operating frequency of 3.7 Khz but this of course is a preferment as such a horn can readily fit within a small casing and gives a substantial warning signal.
  • the casing can have thereon indicator lights 17,18, one of which 17 is a power indication light so there is a visible indication that the device is operating and the other 18 being an alarm device which can be, say, a flashing red light or whatever is desired which operates when an alarm condition is detected by the sensor.
  • a fan (not shown) which enables ambient air to be drawn through the sensor thereby providing a more sensitive indication of the presence of gas.
  • the alarm also has a testing circuit which has a manual operation button 19 which indicates the alarm is operating correctly.
  • the device of this embodiment is designed for use in enclosed spaces having a source of power, specifically domestic and commercial premises.
  • the invention also includes self-powered alarms which could be used in substantially enclosed barbeque areas and the like and alternatively powered alarms which could be used, for example, in gas powered vehicles and which are operated from the vehicle's power supply.

Landscapes

  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

La présente invention concerne un avertisseur de fuite de gaz apte à être connecté à une source d'énergie électrique comportant une unité de détection pour le type de gaz à détecter, un moyen d'alimentation pour faire fonctionner une résistance chauffante dans le capteur et le circuit restant. Lorsque la sortie du capteur indique la présence d'un gaz à détecter, ledit moyen entraîne l'activation d'un dispositif avertisseur. Le dispositif peut détecter différents gaz sélectionnés et peut être utilisé dans des zones fermées d'immeubles ou des véhicules automobiles.
PCT/AU2008/000516 2007-04-13 2008-04-14 Avertisseurs de fuite de gaz Ceased WO2008124875A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007901934A AU2007901934A0 (en) 2007-04-13 Gas alarms
AU2007901934 2007-04-13

Publications (1)

Publication Number Publication Date
WO2008124875A1 true WO2008124875A1 (fr) 2008-10-23

Family

ID=39863165

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2008/000516 Ceased WO2008124875A1 (fr) 2007-04-13 2008-04-14 Avertisseurs de fuite de gaz

Country Status (1)

Country Link
WO (1) WO2008124875A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018152698A1 (fr) * 2017-02-22 2018-08-30 深圳益创信息科技有限公司 Système et procédé d'alerte de fuite de gaz naturel utilisés dans une ville
WO2018152702A1 (fr) * 2017-02-22 2018-08-30 深圳益创信息科技有限公司 Système à base de station mobile de sécurité publique et procédé de gestion de fuites de gaz naturel
WO2018152701A1 (fr) * 2017-02-22 2018-08-30 深圳益创信息科技有限公司 Système et procédé de détection de fuite de gaz naturel dans un immeuble résidentiel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786462A (en) * 1971-03-18 1974-01-15 Trw Inc Carbon monoxide alarm for automobiles
US4007456A (en) * 1975-12-01 1977-02-08 Craftor Inc. Gas detecting and warning system
US4295028A (en) * 1979-02-23 1981-10-13 Sharp Kabushiki Kaisha Combination of gas sensor controlled cooking utensil and gas leak alarm
US4335379A (en) * 1979-09-13 1982-06-15 Martin John R Method and system for providing an audible alarm responsive to sensed conditions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786462A (en) * 1971-03-18 1974-01-15 Trw Inc Carbon monoxide alarm for automobiles
US4007456A (en) * 1975-12-01 1977-02-08 Craftor Inc. Gas detecting and warning system
US4295028A (en) * 1979-02-23 1981-10-13 Sharp Kabushiki Kaisha Combination of gas sensor controlled cooking utensil and gas leak alarm
US4335379A (en) * 1979-09-13 1982-06-15 Martin John R Method and system for providing an audible alarm responsive to sensed conditions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018152698A1 (fr) * 2017-02-22 2018-08-30 深圳益创信息科技有限公司 Système et procédé d'alerte de fuite de gaz naturel utilisés dans une ville
WO2018152702A1 (fr) * 2017-02-22 2018-08-30 深圳益创信息科技有限公司 Système à base de station mobile de sécurité publique et procédé de gestion de fuites de gaz naturel
WO2018152701A1 (fr) * 2017-02-22 2018-08-30 深圳益创信息科技有限公司 Système et procédé de détection de fuite de gaz naturel dans un immeuble résidentiel

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