Patent ID: 6129154
Filing Date: 2000-10-10
Classification: A62C,B05B

Abstract:
A water spray nozzle, for spraying water in fire prevention systems to extinguish fires, having a housing,having a vortex chamber construed and arranged to define a vortex inside the housing into which at least one first channel communicating with a water supply for supplying water opens tangentially at a distance from the axis of the vortex and which has a first outlet orifice coaxial with the axis of the vortex, the water leaving the first outlet orifice in the form of a water spray cone in front of the water spray nozzle, andhaving a second outlet orifice coaxial with the first outlet orifice inside the vortex chamber at the end of a second channel (14) that is coaxial with the axis (12) of the vortex,characterized in thatupstream from the second outlet orifice (21) the second channel (14) has an enlarged area where the cross-sectional area normal to the axis of the second channel increases in the direction of water flow; the cross-sectional area of the second channel (14) normal to the axis of the second channel does not decrease further downstream from the enlarged area with respect to the direction of water flow; the second outlet orifice (21) is arranged closed to the first outlet orifice (5) and upstream from said first outlet orifice with respect to the direction of water flow so that the stream of water coming out of the second outlet orifice (21) and distributed radially due to the reduced pressure prevailing in the enlarged area of the second channel (14) spreads out as a water spray mist inside the water spray cone leaving the first outlet orifice thus, thus providing for a uniform fire extinguishing effect.