Low noise rotating fan and shroud assembly

A rotating fan and shroud assembly comprising:

• a center core;
• a plurality of radially extending blades being attached to the core, each of said plurality of blades including a body having a preestablished width, a leading edge, a trailing edge and a tip;
• and
• a shroud being positioned around the plurality of blades and being attached to the core, said shroud having a generally "C" shaped circular configuration, an inlet bell-mouth portion having a first end and a second end, an outlet bell-mouth portion having a first end and a second end, and an intermediate portion fixedly interposed between the second end of the inlet bell-mouth portion and the first end of the outlet bell-mouth portion, the juncture of the second end of the inlet bell-mouth portion and the intermediate portion is generally radially aligned with the leading edges of the plurality of blades, the juncture of the first end of the outlet bell-mouth portion and the intermediate portion being substantially centered on the width of each of the plurality of blades, the first end of the inlet bell-mouth portion extending radially outward from the tips of the pluraltiy of blades and extending axially beyond the leading edges of the pluraltiy of blades, and said second end of the outlet bell-mouth portion extending radially outward from the tips of the plurality of blades and extending axially beyond the trailing edge of the plurality of blades.

A rotating fan and shroud assembly adapted for used with an engine;

• said rotating fan and shroud assembly comprising:
• a center core being in driven relationship to the engine;
• a plurality of radially extending blades being attached to the core, each of said plurality of blades including a body having a preestablished width, a leading edge, a trailing edge and a tip;
• and
• a shroud being positioned around the plurality of blades and being attached the core, said shroud having a generally "C" shaped circular configuration, and inlet bell-mouth portion having a first end and a second end, an outlet bell-mouth portion having a first end and a second end, and an intermediate portion fixedly interposed between the second end of the inlet bell-mouth portion and the first end of the outlet bell-mouth portion, the juncture of the second end of the inlet bell-mouth portion and the intermediate portion is generally radially aligned with the leading edges of the plurality of blades, the juncture of the first end of the outlet bell-mouth portion and the intermediate portion is substantially centered on the width of each of the plurality of blades, the first end of the inlet bell-mouth portion extending radially outward from the tips of the plurality of blades and extending axially beyond the leading edges of the plurality of blades, and said second end of the outlet bell-mouth portion extending radially outward from the tips of the plurality of blades and extending axially beyond the trailing edges of the plurality of blades.