Patent ID: 6164381
Filing Date: 2000-12-26
Classification: A62C

Abstract:
Drive source for feeding extinguishing medium into at least one spray head (2, 3; 2, 3; 200, 300; 2000, 3000) for extinguishing fire, the drive source comprisinga liquid source (5; 500; 501) including liquid and a gas source (9; 900) including gas,mixing means for mixing the liquid of the liquid source (5; 500; 501) and the gas of the gas source (9, 900),and transportation means for leading the liquid and the gas into 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 for releasing the extinguishing medium from the spray head in the form of a mixture of gas and liquid droplets, characterized in thatthe mixing means comprise a cylinder piston apparatus (50) comprising a first piston (12) arranged within a first cylinder (10) and a second piston (13) arranged within a second cylinder (11), both cylinders comprising a first chamber (14 and 16, respectively) and a second chamber (15 and 17, respectively),the gas source (9; 900) is alternatively connected to the second chamber (15) of the first cylinder or the second chamber (17) of the second cylinder through a conduit system (24) whereto a directional valve (19, 19') is connected,the directional valve (19, 19') is by means of a control device (7, 7') arranged in a first operating position to keep a connection between the gas source (9; 900) and the second chamber (15) of the first cylinder open and a connection between the second chamber (17) of the second cylinder and an outlet conduit (1; 1, 100) of the transportation means open and in a second operating position to keep a connection between the gas source (9; 900) and the second chamber (17) of the second cylinder open and a connection between the second chamber (15) of the first cylinder and the outlet conduit (1; 1,100) open.