DE2854777A1 - DEVICE FOR PRODUCING EXTINGUISHING FOAM - Google Patents

Description

The present invention relates to an apparatus for manufacturing of extinguishing foam. The production of extinguishing foam, in particular a halogen snow, is known. Here is a halogen-containing Low boiling point substance associated with a foaming liquid based on water or oil. The product obtained is by pressure of a neutral gas, for example nitrogen and the reaction of the halogen-containing mixture sprayed with the air. The devices that are used to produce extinguishing foam exist essentially consists of two containers, between which a connection is established during the deletion process. The first container

909826/0846

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- 7790/01 Dr.W / L - - 4 - December 7, 1978

contains the halogen-containing substance, which under pressure becomes a neutral Gas, for example nitrogen; the second container contains the foaming solution. If the device is used, so the halogen-containing substance is driven into the second container. If the container with the pressurized halogen-containing Fabric is full, there is full pressure. Mixing takes place under specified optimal conditions, the spray width is maximum. If the first container gradually empties, the pressure also decreases, although the ideal conditions no longer exist can be reached and the spray distance also decreases. In addition, when the container is connected, the entire contents are mixed will; if the fire is extinguished quickly, part of the extinguishing foam is no longer used and spoils. Since the tightness of the Elements is different, one of them fails; their chemical components damage the condition of the extinguishing device. If the extinguishing device is of low capacity, such as a portable fire extinguisher, it is possible to to empty it completely after the fire has been extinguished. In the case of larger devices, such as mobile fire engines, the loss would be too big considering the price of the ingredients.

The present invention enables the aforementioned disadvantages to avoid. The invention relates to a device for producing extinguishing foam, consisting of a container for an extinguishing agent, a water container, a container for the foaming agent, a source of highly compressible, non-flammable gas, at least one mixing chamber, connecting lines between the gas source and the containers, and drain lines between the mixing chamber and the containers. The device according to the invention enables an equal

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to maintain a moderate jet of the extinguishing nozzle or foam cannon, whereby the nature of the Extinguishing foam remains the same. The various substances are prepared in a mixing chamber, i.e. outside the storage container and thus in the required quantity. After completing the extinguishing work, each container still contains a certain amount of substance and can be filled accordingly. In this way, only that amount of substance is used that is necessary for the extinguishing work is; the fire extinguisher does not have to be taken out of operation for refilling, which means considerable savings means. In a preferred embodiment, the inventive device contains Means for flushing out the outflow lines and the mixing chamber, which are independent of the outflows from the containers are so that the lines through which the possibly corrosive extinguishing mixture flowed, cleaned quickly can be. In a preferred embodiment of the invention, the outlet valves of the containers are controlled by the gas source. For a better understanding of the invention, reference is made to the following detailed description and the accompanying drawings referenced, in which an embodiment is shown, to which the invention is not limited.

The single drawing shows a device according to the invention for producing extinguishing foam.

The device comprises a container 1 for the extinguishing agent, a water container 2, a container 3 for the foaming agent and a source k of a pressurized, neutral gas which does not contain hydrocarbons and is non-flammable. Connecting lines 5, 6 and 7, which branch off from a main line 8

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gen, connect the gas source 4 each with the containers 2, 1 and 3. Outflow lines 9, 10 and 11, which each emanate from the containers 2, 1 and 3, each split into two branches 9 ', 9 "; 10 ', 10 ";11' and 11". The branches 9 ', 10 · and 11' lead to a mixing chamber 12, while the branches 9 ¹ ', 10 "and 11" lead to a mixing chamber 13. The mixing chamber 12 feeds a foam extinguisher 14 via a line 15; the mixing chamber 13 feeds two spray nozzles 16 and 17 via a line 18 and two hoses 19, 20 which are rolled up on two decoilers 21, 22. The compressed gas source 4 consists of nitrogen bottles, the extinguishing agent consists of a fluorohydrocarbon such as chlorobromodifluoromethane or bromomethylene; the foaming agent can, for. B. consist of sodium lauryl sulfate. The mixing chambers 12 and 13 contain a venturi that creates a vortex. The flushing device for flushing out the discharge lines 9, 10 and 11, the mixing chambers 12 and 13 and their outflow lines contain flushing lines 23, 24 and 25 which connects the gas source 4 to the lines 9, 10 and 11. The flushing lines 23, 24 and 25 are connected in parallel to the inflow lines 5, 6 and 7.

The device also contains on the branch lines 9 ', 10' and 11 'one-way valves, which are mounted immediately in front of the mixing chamber 12 are, as well as one-way valves 27 on the branch lines 9 ", 10" and 11 "immediately before the mixing chamber 13. One-way valves 28, 29 and 30 are respectively also attached to the supply lines 5, 6 and above the junction to the flushing lines 23, 24 and 25. These flushing lines in turn have one-way valves 31, 32 and 33 shortly before their connection with the outflow lines 9, 10 and 11 on. Outflow valves 34, 35 and 3'6 of containers 1, 2

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and 3 are controlled by the gas source 4; the lines for this control are for the sake of clarity of the drawing not illustrated. There are manual control valves on the flushing lines 23, 24 and 25 37j 38 and 39 attached. The extinguishing cannon 14 is operated via a manual valve 40, the spray nozzles 16 and 17 are operated accordingly via manual valves 41, 42 and 43, 44. In the main line 8 is a gas line valve 46 above a Main valve 45 attached, via which all feed lines 5, 6 and 7 can be controlled. Reference numerals 47, 48, 49 and 50 denote Control manometer.

The device works as follows:

For start-up, the valves 45, 35, 34 and 36 are opened, while the valves 37, 38 and 39 of the flushing lines 23, 24 and 25 remain closed. Now, under the pressure of the gas, the contents of the containers 1, 2 and 3 in the mixing chambers 12 and pressed. By opening the valve 40 for the foam extinguisher 14 and the valves 41, 42 and 43, 44 for the spray nozzles 16 and the extinguishing foam is ejected. After completing the extinguishing process, the valves 34, 35 and 36 are closed and the valves 37, 38 and 39 open. The gas pressure now acts on the flushing lines 23, 24 and 25 and flushes the remaining extinguishing substances from the outflow lines 9, 10, 11, the mixing chambers 12 and 13 and the lines 15, 18 and the hoses 19, 20, the spray nozzles 16 and 17 and the fire fighting cannon 14 out. After this flushing process has been completed, the main valve 45 is closed, so that the device is no longer under gas pressure. The containers 1, 2 and 3 can then be refilled, after which the valves 37, 38 and 39 are closed. The invention is

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is not limited to the embodiment shown, but extends to all those skilled in the art, depending on the application requirements Variation possibilities.

909826/0846

Claims (7)

Rolf Charrier P alc η [a η wa 11
Augsburg 31 P.O. Box 242 - 1 - Rohlinuenslraße 8 Tcldoiv ns21 / 36015 Note: SOCIETE DE VENTE ET,, Po, NL-h ^ kk.) Ni> i Munich No. 154-Si-SOi D'EXPLOITATION DU PROCEDE MEVE - 7790/01 Dr.W / L - Augsburg, December 7th 1978 Claims Γ 1. , ι foam fire extinguisher, characterized in that it has a container for the extinguishing agent, a water container, a container for a foam-forming agent, at least one mixing chamber, a neutral propellant gas source with a gas that is neither flammable nor flammable under pressure, connecting lines between the gas source and containers as well as connecting lines between the containers and the mixing chamber, from which at least one foam spray device is fed. 2. Foam fire extinguisher according to claim 1, characterized in that a flushing device for rinsing the outflow lines and the mixing chamber are provided, which allow flushing without prior emptying of the storage container enables. 3. Device according to claim 2, characterized in that that said flushing device has flushing lines through which the propellant gas source with the outflow lines connected is. 4. Foam fire extinguisher according to one of claims 1-3, characterized characterized in that the mixing chamber 909826/0848 original inspected - 7790/01 Dr.W / L - - 2 - December 7, 1978 has a venturi. 5. foam fire extinguisher according to any one of claims 1-5, characterized characterized in that the outlet valves of the storage containers are controlled via the propellant gas source. 6. foam fire extinguisher according to any one of claims 1-5, characterized characterized in that the extinguishing agent consists of a halogen-containing hydrocarbon. 909826/0846