FI69964B - HANDELDSLAECKARE - Google Patents

Description

1 69964

portable fire extinguisher

The invention relates to a hand fire extinguisher having a extinguishing agent container and a working medium container, from which, in use, the operating medium 5 under pressure can be led to the extinguishing agent container to drive the extinguishing agent out of it.

Such extinguishers are also often referred to as discharge extinguishers. In order to direct the extinguishing agent in connection with a fire extinguisher of this type out of the fire extinguisher and, above all, at a sufficient distance to the fire or fire outlet, a corresponding amount of energy is required, which is made available through the pressure stored in the working medium tank. Such additional operating media are necessary because a large proportion of extinguishing agents have no or only a low specific vapor pressure. There are fire extinguishers in which the operating medium is stored together with the extinguishing agent in the pressure tank of the extinguisher, the so-called kestopainesammuttimia. In another type of principle extinguisher to which the invention relates, the working medium is stored in a separate, smaller working medium tank connected either inside or outside the 20 extinguishing agent tanks. In this type of extinguisher, the operating medium is introduced into the extinguishing agent tank only just before the fire is extinguished or the fire outbreak is suppressed, in particular by opening the valve.

Various gases can be used as the working medium, such as compressed air, carbon dioxide, nitrogen, etc. Carbon dioxide is often used, especially also in liquefied form, because carbon dioxide can be liquefied under pressure. In fire extinguishers with liquefied gas under pressure, a very low temperature is generated locally due to the expansion of the pressurized liquefied gas after opening the overflow valve. This can result in a portion of the liquefied working medium, as it expands, cool so strongly that it transitions to a solid form 35 that no longer the required amount of working medium flows from the working medium tank to the reinforcing medium tank to generate the required high pressure to expel the extinguishing agent. In other words, the required throw distance can no longer be achieved.

5 In practice, this has been shown to have an effect at ambient temperatures of -10 ° C when using liquefied carbon dioxide. Already at -10 ° C there are clearly observable and at -20 ° C--30 ° C significant negative effects. The operation of the hand fire extinguisher can no longer be applied in this ambient temperature range.

To overcome this problem, a non-liquefied, only compressed gas, such as nitrogen, which does not freeze at very low ambient temperatures, is generally used. However, this has the disadvantage that a routine-5 inspection of fire extinguishers, which is usually performed every two years, requires a cumbersome device to ensure that there is still sufficient fuel in the working fluid tank. For a liquefied gas under pressure, this can be done in a very simple way only by weighing the working medium tank.

The object of the invention is thus to implement a hand fire extinguisher of the type already mentioned in such a way that safe operation can be achieved even at low ambient temperatures.

According to the invention, the object is solved in such a way that the blow pipe is formed as a straight pipe throughout, that the straight riser is attached to the upper end of the extinguishing tank. the upper end of the riser can be connected to a fire hose or fire pipe.

The invention uses, on the one hand, the advantages of a liquefied gas under pressure, on the other hand, by means of a riser, the expansion effect is prevented, which could lead to freezing.

5 li 3 69964 This means that the operating medium flows in a fluid state into the extinguishing agent tank and only there, through evaporation, enters a gaseous state. The fire extinguisher according to the invention can still generate a sufficiently high pressure even at ambient temperatures of -35 to -40 ° C with a normal amount of operating medium so that the extinguishing medium can be directed to the fire outlet by means of the operating medium and thus extinguish the fire.

The extinguisher according to the invention also has advantages when such low ambient temperatures, i.e. temperatures below -20 ° C, are not to be expected, since then, due to the use of a riser, a smaller amount of operating medium can be used in the working medium tank.

The invention will be further illustrated by means of the exemplary embodiments shown in the drawing. In this drawing, Fig. 1 shows a schematic section of a fire extinguisher with a working medium tank arranged outside the reinforcing agent container, and Fig. 2 shows a fire extinguisher with a working medium container arranged in the extinguishing agent container.

Fig. 1 shows an extinguishing agent container 1a and a working substance container 2a attached to the outside of the extinguishing agent container 1a, which is supported by a bottle basket 3 welded to the sealing agent container 1a. From the working medium tank 2a, the riser 5a leads inside the extinguishing medium tank, where the extinguishing medium is stored. The working medium is stored in the working medium tank 2a. The riser 6a is penetrated from the outside by a riser 6a to which a hose 7a with a lever valve (not shown) is connected. A shut-off valve 9a is arranged in the flow path between the working medium tank 2a and the blow pipe 5a, which can be formed either as a rotary valve as shown here or, as in the embodiment shown in Fig. 2, as an impact valve.

4,69964 An riser 10a extends to a working medium tank 2a with a pressurized liquefied gas, in particular carbon dioxide, which is connected to a shut-off valve 9a in the flow path.

The exemplary embodiment shown in Fig. 2 differs substantially from that according to Fig. 1 only in that the operating medium container 2b is arranged in the extinguishing agent container Ib, whereby a holder 4 is provided for this purpose, to which the shut-off valve 9b is also connected. A further .0 si is the carrying handle 11 described for the fire extinguisher according to Fig. 2, which can also be adapted to the embodiment © according to Fig. 1. In addition, there is a lever valve 8 described at the other end of the hose 7b for the embodiment according to Fig. 2. Other components of the extinguisher according to Fig. 2 have the same reference numerals with the addition b.

Here, too, the working medium tank 2b has a riser pipe 10b leading to the shut-off valve 9b, through which the operating medium flows from the opening of the shut-off valve 9b through the blow pipe 5b to the shut-off tank Ib, the steam-JO through the riser 6b, and the hose 7b to the lever valve 8 and from its opening to the fire station.

Until now, in conventional extinguishers, the drop in temperature due to the expansion of the liquefied gas in the working medium tank at very low ambient temperatures could move it to a solid state and thus cool, so that the high pressure required to extinguish the extinguishing agent could no longer be achieved.

In the extinguisher according to the invention, on the other hand, liquefied gas is led from the operating medium tank 2a, 2b with the shut-off valve 9a, 9b open in liquid to the extinguishing medium tank 1a, 1b, and is only evaporated there, thus eliminating the risk of freezing.

The invention is thus applicable wherever low ambient temperatures are regularly expected, such as in the mountains, in the vicinity of the poles 5, in refrigeration plants or the like.

Extinguishing powder is expediently used as extinguishing agent.

Claims (1)

Claim 6 99 6 4 A hand-held fire extinguisher with an extinguishing agent container (1a, Ib) for extinguishing powder and a working medium container 5 (2a, 2b) for liquefied gas as a working medium, from which the operating medium can be operated under pressure by means of a riser (10a, 10b) , 5b) in which a riser is attached to a shut-off valve (9a, 9b) arranged at the upper end of the working medium tank, which blow pipe is connected to the same shut-off valve in the saunas and which in turn is introduced into the , 7b), characterized in that the blow pipe (5a, 5b) is formed as a straight pipe throughout, that the straight riser (6a, 6b) is attached to the upper end of the extinguishing agent tank (1a, Ib), which riser is arranged in the vicinity of the inner wall of the extinguishing agent -20 of the blowpipe (5a, 5b ) extending completely to the bottom of the extinguishing agent tank and the upper end of the riser of which can be connected to the extinguishing hose or extinguishing pipe (7a, 7b). li