EP0141563B1 - Appareil extincteur à poudre - Google Patents

Appareil extincteur à poudre Download PDF

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Publication number
EP0141563B1
EP0141563B1 EP84307029A EP84307029A EP0141563B1 EP 0141563 B1 EP0141563 B1 EP 0141563B1 EP 84307029 A EP84307029 A EP 84307029A EP 84307029 A EP84307029 A EP 84307029A EP 0141563 B1 EP0141563 B1 EP 0141563B1
Authority
EP
European Patent Office
Prior art keywords
valve
powder
chamber
pressure
fire extinguisher
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
EP84307029A
Other languages
German (de)
English (en)
Other versions
EP0141563A2 (fr
EP0141563A3 (en
Inventor
Roger Carr
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
Priority to AT84307029T priority Critical patent/ATE34924T1/de
Publication of EP0141563A2 publication Critical patent/EP0141563A2/fr
Publication of EP0141563A3 publication Critical patent/EP0141563A3/en
Application granted granted Critical
Publication of EP0141563B1 publication Critical patent/EP0141563B1/fr
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C13/00—Portable extinguishers which are permanently pressurised or pressurised immediately before use
    • A62C13/66—Portable extinguishers which are permanently pressurised or pressurised immediately before use with extinguishing material and pressure gas being stored in separate containers
    • A62C13/68—Portable extinguishers which are permanently pressurised or pressurised immediately before use with extinguishing material and pressure gas being stored in separate containers characterised by means for releasing the extinguishing material
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/02—Permanently-installed equipment with containers for delivering the extinguishing substance

Definitions

  • This invention relates to a powder type fire extinguisher.
  • a powder contained in a chamber in the extinguisher is driven out of the chamber by compressed gas when a container holding the gas is opened.
  • compressed gas it is necessary to ensure that the compressed gas does not escape directly through the outlet without entraining the powder, and thus that the powder is fully fluidized inside the chamber before any output from the chamber occurs.
  • DE-A-1434959 there is disclosed such a fire extinguisher, in which the valve controlling the compressed gas escape is activated by a manual lever operable in two stages. Since the second stage is also under manual control, it cannot be ensured that the powder has been sufficiently fluidized before any output commences.
  • a fire extinguisher for discharging powder having a chamber for holding the powder, a container for compressed gas, a powder outlet from the chamber and means for opening the gas container to allow compressed gas to enter the chamber and drive the powder out of the outlet, wherein a valve is provided in the outlet, the valve having a valve member movable onto and off a seat in a valve housing to close or open the outlet, characterised in that the valve member is movable by pressure on opposed faces of the member, that the area of the valve member face exposed to pressure from the chamber is greater than the area of the other face, and in that a passage is provided from the gas container to the valve housing to allow compressed gas to act on said other face of the valve member directly the container is opened.
  • valve is held closed while the compressed gas brings the powder into a fluidized state and while the pressure in the chamber builds up.
  • the pressure in the chamber is equal to the pressure acting on said other face of the valve member, the difference in areas of the valve member faces exposed to pressure will cause the valve to open fully to allow the fluidized powder to pass out.
  • the extinguisher has a head fitting which includes an outlet passage and which supports a cylinder containing the compressed gas and a mechanism for puncturing the cylinder to allow the gas to escape into the chamber and which also contains passages for directing the escaping gas through a tube to the bottom of the mass of powder in the chamber and to said other face of the valve member.
  • the valve is preferably mounted in the outlet passage in the head fitting.
  • the valve may be a poppet valve and said other face may be formed by the end of the valve stem.
  • the valve stem may be arranged above the head and the head itself may be acted upon by the pressure in the chamber.
  • the valve head may present a rounded face to the chamber, to offer minimal resistance to the flow of powder when the valve is open.
  • the outlet passage may be continued upstream of the valve, into the chamber, by an elongate tube.
  • the invention also provides a method of controlling the output from a fire extinguisher for discharging powder, characterised in that a valve is placed in the powder outlet from the extinguisher, and, on opening of a source of compressed gas to expel the powder, the gas is introduced to a space where it exerts a force on the valve to hold the valve closed while the pressure in the powder chamber builds up to a level at which satisfactory output can take place, and when this level has been reached, the pressure in the chamber exerts a force on the valve which opens the valve to allow the powder to be expelled.
  • the head fitting 10 shown in Figure 1 is for fitting into the neck of a cylindrical powder container in a conventional manner.
  • the container itself is not shown, and can be conventional. Any suitable method of fastening the fitting into the container neck can be used.
  • a flange 12 limits the insertion of the fitting into the container neck.
  • the fitting has a socket 14 for receiving a cylinder of compressed gas.
  • a conventional firing mechanism (not shown) will be provided on the outside of the fitting to allow the cylinder to be punctured when the extinguisher is to be used.
  • An outlet passage 16 extends through the fitting.
  • a conventional 'nozzle to direct the flow can be attached to the outer end 18 of the passage.
  • valve shown in Figures 3 and 4 fits into the lower end 20 of the passage.
  • the socket 14 for the cylinder and the lower end of the outlet passage can be seen. Also visible is a socket 22 for a tube (not shown) which extends from the head fitting to near the bottom of the chamber.
  • a passage 24 for compressed gas leads from the socket 14 to the socket 22, and another passage 26 leads from socket 22 to the lower end 20 of the outlet passage 16.
  • the valve shown in Figures 3 and 4 has a housing 30 with a valve seat 31 and a valve member 32 movable in the housing.
  • the valve member has a head 34 and a stem 36 and the stem is guided in a bore 38 in the housing.
  • the top of the housing 30 is a tight fit in the lower end 20 of the outlet passage, and a key portion 40 fits in a keyway 42 in the head fitting.
  • the engagement between the key 40 and the keyway 42 ensures that the passage 26 lines up with a passage 44 in the valve housing, so that gas pressure can pass from the cylinder socket 14 to the bore 38 in which the valve stem 36 slides.
  • 0-ring seals 46 and 48 respectively seal the valve housing in the outlet passage 16 and the valve stem 36 in the bore 38.
  • puncturing of the compressed gas cylinder by the firing mechanism causes gas to be forced through passages 24 and 26, typically at a pressure of 50-75 daN/cm 2 (750-1000 psi). Gas passes down a tube fitted in socket 22 to fluidise the powder and to build up the pressure inside the chamber. Gas also passes into passage 44 to act on the top of the valve stem 36. As a result, the valve member 32 is forced downwards against the seat 31 to close the valve. The pressure acting on the lower side of the valve head 34 is gradually building up as the powder is becoming fully fluidized, but initially is substantially lower than the pressure above the valve.
  • the pressure on the bottom of the valve will become equal to that above. Since the area of the valve head presented to pressure from below is greater than the area of the stem presented to pressure from above there will be a net opening force acting on the valve member, and the valve will open to allow the fluidized powder to flow through the pipe 50 and out. This stage is typically reached about 2 seconds after operation of the firing mechanism.
  • Figure 4 shows that the cross-sectional area occupied by the part of the housing containing the bore 18 is kept small, so as not to unduly reduce the cross-sectional area of the outlet passage in this region.

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)

Claims (9)

1. Extincteur servant à délivrer une poudre et comportant une chambre retenant cette poudre, un récipient contenant un gaz comprimé, une sortie permettant d'évacuer la poudre hors de la chambre et des moyens pour ouvrir le récipient contenant le gaz afin de permettre au gaz comprimé de pénétrer dans la chambre et d'entraîner la poudre à l'extérieur de la sortie, et dans lequel une soupape est prévue dans la sortie (16), cette soupape possédant un élément de soupape (32) pouvant être rapproché et écarté d'un siège (31) dans un boîtier de soupape (30) de manière à fermer et ouvrir la sortie, caractérisé en ce que l'élément de soupape (32) est déplaçable sous l'action d'une pression applicable sur ses faces opposées, lorsque la surace de la face (34) de l'élément de soupape, soumise à la pression arrivant de la chambre est supérieure à la surface de l'autre face (36), et en ce qu'il est prévu un passage (44) reliant le récipient contenant le gaz au boîtier de soupape (30) de manière à permettre au gaz comprimé d'agir directement sur ladite autre face (36) de l'élément de soupape (32) lorsque le récipient est ouvert.
2. Extincteur selon la revendication 1, caractérisé par un embout de tête (10) comportant un passage de sortie (16) et supportant une bouteille contenant le gaz comprimé, et un mécanisme servant à perforer la bouteille pour permettre au gaz de pénétrer dans la chambre, et contenant également des passages (24, 26) servant à diriger le gaz sortant, dans un tube (22), en direction de la base de la masse de poudre située dans la chambre et en direction de l'autre face (36) de l'élément de soupape (32).
3. Extincteur selon la revendication 2, caractérisé en ce que la soupape (32) est montée dans le passage de sortie (16) situé dans l'embout de tête.
4. Extincteur selon l'une quelconque des revendications précédentes, caractérisé en ce que la soupape (32) est une soupape à clapet (34) et que ladite autre face est formée par l'extrémité d'une tige (36) de la soupape.
5. Extincteur selon la revendication 4, caractérisé en ce que la tige de soupape (36) est disposée au-dessus d'une tête (34) de la soupape et que, en fonctionnement, cette tête elle-même est soumise à l'action de la pression régnant dans la chambre.
6. Extincteur selon la revendication 5, caractérisé en ce que la tête (34) de la soupape possède une face arrondie tournée vers la chambre de manière à présenter une résistance minimale à l'écoulement de poudre lorsque la soupape (32) est ouverte.
7. Extincteur selon l'une quelconque des revendications 2 à 6, caractérisé en ce que le passage de sortie (16) se poursuit en amont de la soupape (32), à l'intérieur de la chambre, sous la forme d'un tube allongé (50).
8. Procédé pour commander l'éjection de sortie d'un extincteur servant à délivrer une poudre, caractérisé en ce qu'une soupape (32) possédant la sortie permettant l'évacuation de la poudre hors de l'extincteur et que, lors de l'ouverture d'une source de gaz comprimé visant à éjecter la poudre, le gaz est introduit dans un espace (38, 44), où il applique une force à la soupape de manière à maintenir cette dernière fermée alors que la pression régnant dans la chambre contenant la poudre s'établit à un niveau pour lequel on peut obtenir une sortie satisfaisante, et que, lorsque ce niveau a été atteint, la pression régnant dans la chambre applique à la soupape (32) une force qui ouvre cette dernière en permettant l'éjection de la poudre.
9. Procédé pour commander l'éjection de sortie d'un extincteur servant à délivrer une poudre, caractérisé en ce qu'il est prévu dans la sortie (16) d'éjection de la poudre une soupape comportant un élément de soupape (32) pouvant, sous la pression appliquée à des surfaces opposées, se rapprocher et s'écarter d'un siège (31) situé dans un boîtier de soupape (30) pour fermer et ouvrer la sortie, que la surface de la face (34) de l'élément de soupape, soumise à une pression provenant de la chambre est supérieure à la surface de l'autre face (36), le procédé consistant.en outre à appliquer un gaz comprimé à ladite autre face (36) de l'élément de soupape (22) et ce directement lorsque le récipient est ouvert, de manière à maintenir la soupape fermée lorsque la pression dans la chambre contenant la poudre s'établit à un niveau satisfaisant.
EP84307029A 1983-10-21 1984-10-15 Appareil extincteur à poudre Expired EP0141563B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84307029T ATE34924T1 (de) 1983-10-21 1984-10-15 Puderfeuerloescher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8328213 1983-10-21
GB08328213A GB2148114B (en) 1983-10-21 1983-10-21 Powder type fire extinguisher

Publications (3)

Publication Number Publication Date
EP0141563A2 EP0141563A2 (fr) 1985-05-15
EP0141563A3 EP0141563A3 (en) 1986-01-29
EP0141563B1 true EP0141563B1 (fr) 1988-06-08

Family

ID=10550557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84307029A Expired EP0141563B1 (fr) 1983-10-21 1984-10-15 Appareil extincteur à poudre

Country Status (5)

Country Link
EP (1) EP0141563B1 (fr)
AT (1) ATE34924T1 (fr)
DE (1) DE3471887D1 (fr)
ES (1) ES8601708A1 (fr)
GB (1) GB2148114B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2734163B1 (fr) * 1995-05-15 1997-08-01 Sicli Dispositif de securite anti haute-pression pour extincteur d'incendie
DE29602248U1 (de) * 1996-02-09 1996-04-11 Hofer, Daniel, 78056 Villingen-Schwenningen Druckhebel-Ventil für Dauerdruck-Feuerlöscher
GB2408684B (en) * 2003-12-06 2005-11-09 Roger Carr Improved powder extinguisher discharge valve
GB0712527D0 (en) * 2007-06-28 2007-08-08 Carr Roger Discharge valve for powder-type fire extinguisher

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1434959A1 (de) * 1963-10-07 1968-12-05 Schmoele Metall R & G Armaturen fuer Loeschgeraete,insbesondere Trockenloescher
JPS4952499A (fr) * 1972-09-25 1974-05-21
US3937257A (en) * 1974-12-13 1976-02-10 Biro Fils Method and apparatus for pressurizing reservoirs of fire-fighting equipment
GB1567895A (en) * 1978-04-26 1980-05-21 Glover & Co Ltd T Operating head for a fire extinguisher

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Chambers, dictionary of sciences pages 918, 919 *

Also Published As

Publication number Publication date
EP0141563A2 (fr) 1985-05-15
GB2148114A (en) 1985-05-30
ES536928A0 (es) 1985-11-16
DE3471887D1 (en) 1988-07-14
ATE34924T1 (de) 1988-06-15
EP0141563A3 (en) 1986-01-29
ES8601708A1 (es) 1985-11-16
GB2148114B (en) 1987-05-20
GB8328213D0 (en) 1983-11-23

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