Fire extinguishers – Processes
Patent
1999-04-30
2000-12-26
Kashnikow, Andres
Fire extinguishers
Processes
169 28, 169 35, 169 47, 169 58, 169 59, 169 61, A62C 200
Patent
active
061643823
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a device for explosive quenching of fires, with two flexible hoses disposed next to one another and transversely to the direction of danger, and closable at both ends, both filled with a first and a second quenching agent, and each with an explosive material in or on the hoses, by means of ignition of which in each case a pulse is generated and the quenching agent is atomised to form a mist and applied to the fire. The invention further relates to a method of explosive quenching of fires with the device described.
Both such a device and such a method for explosive quenching of fires is for example known from DE 195 00 477 C1. The principle of explosive quenching is based on the fact that during detonation of the explosive material within or in the vicinity of a homogeneous medium in the form of a quenching agent, an extremely high pressure is built up, so that, for example, a compressive shock runs through the water in the hose, which imparts to it an enormous impulse, atomizes it into the finest particles and throws it from the center of the explosive charge symmetrically into the environment. The advantage of atomization of a preferably aqueous quenching agent resides in the extremely highly effective quenching agent surface area in proportion to the quantity of quenching agent used.
The disadvantages of the device and the corresponding method known from DE 195 00 477 C1 reside in the unsatisfactory distribution of the quenching agent in the environment of the explosive hose upon detonation of the explosive charge. It has become apparent that when one single explosive hose is used, the quenching agent is distributed roughly uniformly into one vertical lobe and one left-hand and one right-hand horizontal lobe, with practically no delivery of quenching agent taking place at an angle of 45.degree. to the ground surface. The delivery of quenching agent at a 45.degree. angle is, however, highly desirable in order to achieve an effective range and optimum surface coverage.
The utilisation of two explosive hoses disposed parallel next to one another has no effect on the disadvantage of an unsatisfactory spray characteristic at a 45.degree. angle to the ground surface. Only the height and the volume of the vertical lobe are considerably increased.
The present invention applies itself to this problem, the object of which is seen to be further to develop both the already mentioned device known from DE 195 00 477 C1 for explosive quenching of fires, and further to develop the corresponding method, so that a concentrated delivery of quenching agent in the direction of danger is possible with satisfactory penetration of space and surface coverage.
In achieving the set object, the device for explosive quenching of fires of the type already mentioned is designed according to the invention in that the pulse from the first hose facing away from the direction of risk is at least twice as great as the pulse of the second hose facing the direction of risk.
By the pulse of a body is known to be understood the product of its mass and its velocity. Furthermore, the density identifies the ratio of the mass of a body to its volume. Thus, the pulse imparted to the quenching agent by the detonation is dependent on the volume and the density of the quenching agent and on the size of the explosive charge which ensures the velocity of the quenching agent particles. The alignment of the range of quenching agent towards the area of risk and the desired ejection characteristic is thus achieved in that the product of mass and velocity of the quenching agent of the first explosive hose which, seen from the area of risk, lies behind the second explosive hose, imparts a larger pulse to the quenching agent in the second hose, than the latter has obtained by its own explosive charge, resulting in a deviation of the main mass of the quenching agent into the direction of danger by means of superimposition of pulses.
The object underlying the invention is further achieved by a method adapted to the d
REFERENCES:
patent: 3482637 (1969-12-01), Mitchell et al.
patent: 4938293 (1990-07-01), Warren et al.
patent: 5115867 (1992-05-01), Tyler
patent: 5894891 (1999-04-01), Rosenstock et al.
Schutte Volker
Wagner Ernst Werner
Evans Robin O.
Kashnikow Andres
Wagner Alarm - und Sicherungssysteme GmbH
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