| 摘要 |
A spray nozzle especially useful as a showerhead operable to deliver an intermittently interrupted or pulsating spray. Water passing through the device is divided within the device into two flow paths which are recombined prior to discharge through groups of nozzle orifices. Water flowing through one of the flow paths is directed against a turbine blade assembly to drive a rotatable valve rotor in rotation at a rotary speed dependent upon the pressure of water following this flow path. The second flow path bypasses the turbine blades, and hence water following the second flow path does not contribute to the rotary speed of the valve rotor. By adjustably throttling flow through the second flow path, the pressure head or driving force of water in the first flow path against the turbine blades may be varied to thus vary the rotary speed of the valve rotor independently of the supply pressure. Flow of water to each group of nozzle orifices is cyclically interrupted by the rotating valve rotor which connects only a portion of the orifices to supply at a given time. The configuration of the rotating valve port and the arrangement of the groups of nozzle orifices is such that back pressure at the rotating valve port remains constant regardless of the rotary position of the valve port. |
