Fire-extinguishing device with a fire-extinguishing fluid

Details Fire-extinguishing device with a fire-extinguishing fluid Fire-extinguishing device with a fire-extinguishing fluid

1998-01-20

1999-10-19

Kashnikow, Andres

Fire extinguishers

Sprinkler heads

169 20, 169 38, 169 42, 169 56, 169 57, 169 60, A62C 3708, A62C 3710, A62C 3712

Patent

active

059672390

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a device for extinguishing fires by means of an extinguishing fluid comprising a supply pipe conducting the extinguishing fluid; the said supply pipe connecting a pump with a plural number of fire extinguishing nozzle-heads, each comprising at least one fire extinguishing nozzle; this nozzle being connected to the supply pipe by way of at least one connecting channel; and comprising a fire detection contrivance which, in the case of a fire, triggers the issue of extinguishing fluid from the fire extinguishing nozzles. In this at least with one of the fire extinguishing nozzle heads, the issue of extinguishing fluid from at least one of the extinguishing nozzles is closed off by a shut-off device which opens automatically when the minimum pressure of the extinguishing fluid is exceeded. Such fire extinguishing devices are stationary installations in buildings or ships. In addition, the invention relates to a fire extinguishing nozzle-head for a device of the type mentioned above for extinguishing fires.
Known devices are usually equipped with a pressure generator, for example a pump, for generating the extinguishing fluid pressure required for firefighting and with fire extinguishing nozzles arranged in the localities susceptible to fires; the said fire extinguishing nozzles are connected to the pressure generator by way of a system of supply pipes. In the case of a fire, the issue of extinguishing fluid from the fire extinguishing nozzles is triggered by a fire detection contrivance which is allocated to each of the fire extinguishing nozzles.
One problem when operating extinguishing devices of the type described above is that if a fire breaks out only in a limited area of a sector or an enclosed space, in each instance only the fire extinguishing nozzles allocated to the respective area are opened. This in turn leads to the danger that insufficient extinguishing fluid is supplied to the surroundings of the seat of the fire, so that the fire also encroaches upon the remaining areas of the sector, in spite of the fire extinguishing nozzles allocated to the seat of the fire being opened. In the case of a fire breaking out within a sector, it is thus necessary to open not only the fire extinguishing nozzles directly allocated to the seat of the fire, but all fire extinguishing nozzles installed in the sector. In order to meet these requirements, as a rule, complicated and expensive fire detection contrivances or control systems are used.
An extinguishing nozzle-head of the type described above is known from publication of the PCT application WO-A-94/16771. In the known fire extinguishing nozzle-head, the connecting channel by which the fire extinguishing nozzle is connected to the supply pipe, in the quiescent state is closed by a piston. This piston is supported by way of a helical spring on a glass vial as is normally used as a fire detection contrivance with these types of fire extinguishing nozzle-heads. The quiescent-state pressure of the extinguishing fluid present in the supply pipe impinges on the piston.
In the known fire extinguishing nozzle-head, the length of the spring is designed in such a way that in the case of a fire, the travel that becomes free as a result of the fire detector shattering, is sufficient to move the piston into its open position, with the spring being untensioned. At the same time, the force of the spring is such that in the case of an increase in the pressure in the supply pipe, the spring is compressed and the piston is moved in this way into its open position.
The known fire extinguishing nozzle-head allows significant simplification in the design and control of fire extinguishing devices where a plural number of fire extinguishing nozzle-heads must be opened depending on the location of the fire. Due to the close tolerance limits within which the spring and the piston must be designed and moved, the known fire extinguishing nozzle-head has been found to be prone to malfunction.
It is the object of the present invention, by simple and econo

REFERENCES:
patent: 3791450 (1974-02-01), Poitras
patent: 5513708 (1996-05-01), Sundholm
patent: 5531275 (1996-07-01), Sundholm
patent: 5573065 (1996-11-01), Sundholm

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