Fluid dispersal device

A fluid dispersal device comprising:

• a housing having wall means defining a first chamber and a second chamber, which is stepwise widened from said first chamber, in the interior of said housing, said first chamber being unobstructably comunicated with said second chamber
• a fluid inlet port in a wall of said housing for introducing pressurized fluid thereinto;
• a nozzle in said housing and communicated with said fluid inlet port for jetting the pressurized fluid from said fluid inlet port into said first chamber as a fluid jet;
• and
• an outlet throat in a wall of said housing for jetting the fluid jet from said second chamber;
• said wall means being composed of
• deflection wall means partly defining said first chamber, for sucking and deflecting the fluid jet jetted from said nozzle due to the interaction therewith in one deflecting direction, said deflection wall means extending sidewards from said nozzle and then extending towards only said outlet throat,
• branch wall means for branching the deflected fluid jet into two branch flows, one branch flow flowing into said outlet throat and jetting from said outlet throat, and the other branch flow flowing sidewards in said second chamber, and
• turn wall means extending from said deflection wall means stepwise and in part defining said second chamber for turning said other branch flow and colliding the turned other branch flow with the deflected fluid jet in a direction generally perpendicular to the jetting direction of the deflected fluid jet to push the deflected fluid jet in a direction opposed to the one deflecting direction,
• said deflection wall means having two opposed deflection wall portions, said turn wall means having two opposed concave-shaped turn portions, the distance between said opposed turn wall portions being larger than that between said opposed deflection wall portions, said branch wall means having two spaced branch wall portions, each projecting from a downstream end of said throat and spaced from each other through a predetermined distance, and said outlet throat being defined in part by said opposed branch wall portions.