DE1052820B - Device for generating air foam, in particular for fire extinguishing purposes - Google Patents

Description

GERMAN

The invention relates to a device for generating air foam with two alternating in Containers located in the company for the foam concentrate, in particular for fire-fighting purposes.

In some branches of industry, especially in underground mining, emphasis is placed on extinguishing devices high performance, but small in scope to use, even through narrow openings and over routes that are difficult to walk on can be transported. In a known device of this type are arranged two containers to which the foam concentrate is fed alternately. However, since the container the known device also serve as a foam generator, they are made relatively large, so that the known device takes up a relatively large amount of space. Furthermore, for alternating start-up of the containers, the actuation of three three-way cocks each is necessary, so that the known device is also relatively awkward to use.

The invention aims to avoid these disadvantages, and consists in that for both containers only one closure piece is provided, which opposes the respective container in operation closes off the outside air and which is connected to the pressure medium source via a line, through which the pressure medium for expelling the foaming agent is supplied to the container. Through this it is achieved that the size of the foam compound container can be dimensioned so that during emptying There is just enough time left in one container to fill the other foam compound container that was previously emptied easy to refill. Given a device of a certain and sufficient size in the subject matter of the invention z. B. 2.5 liter capacity for a foam compound container. Two Such containers with the necessary fittings so result in terms of the possibility of a Still a relatively small device for continuous operation.

In a particularly useful embodiment of the invention, the closure piece for the Container pivoted by means of a hand lever about a vertical axis in the respective closure position will. If compressed air is used as a pressure medium to expel the foaming agent, this can Closure piece also have a changeover valve through which the compressed air to the one in operation Container is fed while it is after emptying the container by switching the in the container the compressed air can escape. The outlet openings of the containers expediently open into one common foam agent line, which is provided with a sight glass.

contraption
for generating air foam,
especially for fire extinguishing purposes

Applicant:

Minimax Aktiengesellschaft,
Stuttgart, Reinsburgstr. 198

Martin Betzier, Urach (Württ),
has been named as the inventor

In the drawing, an embodiment of the subject invention is shown, namely shows

Fig. 1 shows a device according to the invention in side view, partially in section, and

Fig. 2 the closure device of the foam compound container in a plan view.

In the device shown in Fig. 1, compressed air and pressurized water first enter a pressure control device 1 , which equalizes the pressures of air and water to one another. From the pressure control device 1 , the compressed air is fed through a line 11 and the pressurized water through a line 12 to the mixing chamber 10 of the foam pipe. A partial flow of the compressed air is branched off immediately behind the pressure control device from the line and is fed through the line 2 and a movable connecting hose 3 to a switching valve 5 , which is arranged in a closure piece 4 for the foam compound container 6 a, 6 b. The closure piece 4 is pivotable about a vertical axis 18 and can thereby optionally close one of the two containers 6 a ·, 6 b. In the illustrated embodiment, the container filled with foam agent is closed by the closure piece 4 6a, and through the open switching valve 5, compressed air flows into the container 6 a a. The foaming agent is thereby put under pressure and flows out from one of a non-return valve 7 a controlled lower opening in the container 6 a · on the foaming agent line 8 and through a valve disposed in the foaming agent line 8 sight glass 9 into the mixing chamber 10 of the foam tube.

After the contents of the foam agent container 6 a is exhausted, which can be seen in the sight glass 9 , a lever 16 on the switching valve 5 is depressed, whereby the supply of compressed air into the container 6 a is interrupted and the in the container 6 a

809 7691/48

Claims (4)

collected compressed air is released through a channel 17 arranged in the valve housing of the Umsdialtventils 5. Immediately after the emptied foam compound container 6 a is no longer under pressure, the closure piece 4 is swiveled over the filling opening of the foam compound container 6 &, which has now been filled and which is then immediately put under pressure when the lever 16 is released. The foam concentrate in the container 6 b now flows through a lower opening also arranged on this container and controlled by a check valve 7 b into the foam concentrate line 8 and from here to the mixing chamber 10. In the mixing chamber 10, the proportions of the individual foam components are mixed with one another , and -the resulting air foam is passed through the refiner 13 and through the pressure hose 14 into the spray nozzle 15 or into a discharge lance. Continuous operation can accordingly be maintained by alternately filling and emptying the foam compound containers 6a and 6b. It is possible to constantly replenish the foam concentrate requirement in handy canisters. From Fig. 2 it can be seen that the pivotable closure piece 4 can be brought into the other only by pivoting through about 90 °. Patent claims: 1. Device for generating air foam with two alternately in operation containers for the foam concentrate, in particular for fire-fighting purposes, characterized in that only one closure piece (4) is provided for both containers (6 a, 6 b), which closes the container (6 a) in operation from the outside air and which over a line (2) is connected to the pressure medium source (1) through which the pressure medium for expelling the foaming agent is fed to the container (6 a). 2. Device according to claim 1, characterized in that the closure piece (4) for the containers (6a, 6 b) by means of a hand lever about a vertical axis (18) can be pivoted into the respective closing position. 3. Apparatus according to claim 1 or 2, in which the pressure medium for expelling the foaming agent Compressed air is used, characterized in that the closure piece (4) is a changeover valve (5) through which the compressed air is fed to the container (6 a) in operation, while after emptying the container (6 a) by switching the one in the container Lets compressed air escape. 4. Device according to one of claims 1 to 3, characterized in that the outlet openings of the container (6a, 6b ) for the foaming agent open into a common foaming agent line (8) which is provided with a sight glass (9). Considered publications:
British Patent No. 254 285. 1 sheet of drawings ® 80S 769/48 3.59