Fire extinguishers – Fluid systems – Distributing systems
Patent
1996-09-25
1999-02-16
Hoge, Gary C.
Fire extinguishers
Fluid systems
Distributing systems
169 37, A62C 3750
Patent
active
058710558
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an installation for fire fighting, comprising a number of circuits with sprinklers, whereby each circuit is arranged to automatically be separately switched on in the event of a fire after release of a sprinkler in the circuit at the site of the fire. The invention also relates to a sprinkler comprising a housing and an inlet at the side of the housing to a central channel with a spindle in a sliding or almost sliding contact with the channel wall, which sprinkler is intended to be employed in said installation for fire fighting.
In previous known installations of this kind, e.g. an installation monitoring a vehicle deck on a car ferry, the monitored area in question has usually been divided into a number of circuits or sections that can be separately activated and that each can be relatively extensive. In modern car ferries having a width of, for instance, 40 meters, a section has normally extended across the entire width of the ship and about 20 meters along the length of the ship. Since a fire can very well break out at or near the joint between two sections, the possibility to simultaneously activate two sections has been considered necessary. This results first of all in a considerable waste of extinguishing liquid and also requires extremely powerful units for the delivery of the extinguishing liquid. The complete installation becomes unproportionately expensive.
German Offenlegungsschrift 2,548,850 discloses a fire fighting equipment comprising several sprinklers, the equipment being arranged--in order to provide optimum fire fighting with a relatively small amount of extinguishing medium--to release only part of all the sprinklers of the apparatus. The circuit, or those of the sprinklers, that is/are released is/are located in the immediate vicinity of the fire detector producing the signal. One problem of this known fire fighting equipment is that conventional fire detectors that are separate from the sprinklers are used. The fire detector may produce a false signal, as a result of which the wrong fire fighting circuit is switched on. A false signal may occur when the fire detector reacts to smoke that is drifting from a distant site of fire as a result of strong air currents. As a result, the fire detector causes such valves to open that convey extinguishing liquid to a fire fighting circuit that is not located near the fire. This problem is further aggravated by the fact that the fire detectors are typically relatively few in relation to the number of sprinklers. Another problem of this known fire fighting equipment is its complicated construction.
A fire fighting system which is arranged to control a number of fire fighting functions that are arranged in the same fire fighting line, such as the closure of fire-proof doors and the connecting of extinguishing devices, is known from German Offenlegungsschrift 2,533,354. In this system, separate fire detectors are also employed, which involves an uncertainty factor as explained above.
The object of the present invention is to provide a new fire fighting system which solves the above problems.
To achieve this object, the installation is characterized in that it comprises a number of electric positive and negatives wires, which have been arranged to a scanning device comprising breakers (+A-+E, -13, --19) for each positive and negative wire, whereby said wires form an electric net where positive and negative wires are electrically connected via sprinklers respectively comprising individual breakers K, whereby each sprinkler is arranged to open its breaker K upon the release of the sprinkler in question and to thus interrupt the connection between the respective positive and negative wire, whereby the scanning device, upon establishing the interrupted connection and the position of the released sprinkler, is arranged to release according to a plan the sprinklers adjacent to said position by closing according to said plan the breakers (+A-+E, -13, --19) of the scanning device. Preferably, the scanning device is arranged
REFERENCES:
patent: 3884304 (1975-05-01), Messerschmidt et al.
patent: 4175677 (1979-11-01), Poeschl et al.
patent: 4359097 (1982-11-01), Claussen
patent: 4597451 (1986-07-01), Moore et al.
patent: 5531275 (1996-07-01), Sundholm
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