Fluid driven siren pressure pulse generator for MWD and flow measurement systems

A fluid powered fluid siren assembly comprising:

• a housing defining a generally cylindrical flowbore therethrough;
• a stationary turbine flow deflector within the housing which includes one or more directional and radially extending fins for directionally altering fluid flow through the flowbore;
• a stationary siren stator secured within said housing, said stator having at least one lobe and at least one port;
• a rotatable siren rotor retained coaxially to the stator within said housing, said rotor having at least one lobe and at least one port;
• a turbine rotor interconnected with said siren rotor for rotation therewith, the turbine rotor further being associated with the stationary turbine flow deflector for receipt of directionally altered flow from the stationary turbine, the directionally altered flow causing rotation of the turbine rotor with respect to the housing;
• an epicyclical gear reducer operably associating the turbine rotor and the siren rotor to affect a change in the rotation rate of the siren rotor with respect to the turbine rotor, the gear reducer comprising:
• a toothed drive gear operably affixed to the turbine rotor;
• a toothed gear ring operably affixed to the siren rotor;
• and
• a toothed planetary gear operably associating the drive gear and the gear ring.

A fluid powered fluid siren assembly comprising:

• a housing defining a generally cylindrical flowbore therethrough;
• a stationary turbine flow deflector within the housing which includes one or more directional and radially extending fins for directionally altering fluid flow through the flowbore;
• a stationary siren stator secured within said housing, said stator having at least one lobe and at least one port;
• a rotatable siren rotor retained coaxially to the stator within said housing, said rotor having at least one lobe and at least one port;
• a turbine rotor interconnected with said siren rotor for rotation therewith, the turbine rotor further being associated with the stationary turbine flow deflector for receipt of directionally altered flow from the stationary turbine, the directionally altered flow causing rotation of the turbine rotor with respect to the housing;
• an epicyclical gear reducer operably associating the turbine rotor and the siren rotor to affect a change in the rotation rate of the siren rotor with respect to the turbine rotor.