| 摘要 |
The invention relates to a drive force for feeding extinguishing medium into at least one spray head (2, 3) for extinguishing fire, the drive source comprising a liquid source (5) including liquid and a gas source (9) including gas, mixing means for mixing the liquid of the liquid source (5) and the gas of the gas source (9), and transportation means (1) for leading the liquid and the gas to the spray head in such a manner that an extinguishing medium including a liquid component and a gas component is led to the spray head. In order for the drive source to enable a controlled dosage of gas to be obtained in the liquid and preferably a substantially even and small droplet size for a substantially long time during the extinguishing process, the drive source is characterized in that the mixing means comprise a cylinder piston apparatus (50) including a first piston (12) arranged in a first cylinder (10) and a second piston (13) an-anged in a second cylinder (11), the cylinder piston apparatus being arranged at each stroke to simultaneously provide both liquid and gas to the transportation means (1).
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