Water spray nozzle

A water spray nozzle comprising:

• a cylindrical body on an upper end of which an inner peripheral flange having an opening is provided;
• and
• a core which is installed in the body and an outer peripheral edge section of an upper end face thereof is made to be in contact with a lower face of the inner peripheral flange, wherein
• a plurality of grooves for nozzle hole, which lead from the outer peripheral side of the core to an inner peripheral side being provided in the outer peripheral edge section of the upper end face of the core;
• a plurality of nozzle holes, which are formed by the lower face of the inner peripheral flange and the grooves for nozzle hole, being set such that, in a side view, a extension line extended from the axis of a flow path leading from the outer peripheral side of the core to an opening in the inner peripheral side is inclined with the opening side directed upward at a predetermined elevation angle relative to an upper face of the body, and that, in a plan view, the extension line passes a position separated from the center of the core;
• wherein an influx path which joins a lower section of the water spray nozzle to the grooves for nozzle holes,
• the influx path is formed by a ring-shaped groove which is formed in an upper outer periphery of the core and joined to the grooves, and an influx hole, whose lower end is open to a lower face of the core and whose upper end is joined to the ring-shaped groove, being provided in the core;
• wherein the core is detachably installed in the body by screwing a male screw provided in the outer periphery of the core into a female screw provided in the inner periphery of the body, and
• a slit for attaching and removing the core is provided along the diameter direction of the core in the upper end face thereof for rotating the core with respect to the body.