Impellers for fluid handling apparatus of the rotary positive displacement type

• US 3,089,638 A
• Filed: 12/01/1958
• Issued: 05/14/1963
• Est. Priority Date: 12/01/1958
• Status: Expired due to Term

• Current Assignee: Willis E. Rose
• Original Assignee: Willis E. Rose
• Inventors: Rose, Willis E.
• Application Number:
  US03/777,350
• Time in Patent Office: 1,625 Days
• US Class Current: 418/150
• CPC Class Codes: F01C 1/126 with elements extending radially from the rotor body not necessarily cooperating with corresponding recesses in the other rotor, e.g. lobes, Roots type

Claims

1. FLUID HANDLING APPARATUS OF THE ROTARY POSITIVE DISPLACEMENT TYPE COMPRISING A PAIR OF LOBED IMPELLERS MOUNTED ON PARALLEL SHAFTS AND ROTATABLE AT A CONSTANT VELOCITY RATIO THROUGH TIMING GEARS FIXED TO SAID SHAFTS, EACH OF SAID IMPELLERS HAVING A CENTRAL WAIST PORTION ADAPTED TO BE MOUNTED ON ONE OF SAID SHAFTS AND A PLURALITY OF INDENTICALLY SHAPED LOBE PORTIONS EXTENDING RADIALLY OUTWARDLY FROM SAID WAIST PORTION, THE PROFILE OF EACH OF SAID IMPELLERS CONSISTING OF A LIKE PLURALITY OF IDENTICAL CONCAVE CIRCULAR ARCS OF UNIFORM RADIUS DEFINING SAID WAIST PORTION AND A LIKE PLURALITY OF IDENTICAL CONVEX NONCIRCULAR CURVES DEFINING SAID LOBE PORTIONS, EACH OF SAID CIRCULAR ARCS SUBTENDING AN ANGLE AT THE AXIS OF THE IM-PELLER SHAFT EQUAL TO 360*/2N, WHERE N IS THE NUMBER OF SAID LOBE PORTIONS, AND EACH OF SAID NON-CIRCULAR CURVES BEING GENERATED FROM A CIRCULAR ARC IDENTICAL WITH THOSE DEFINING SAID WAIST PORTION SO THAT, WHEN SAID IMPELLERS ARE ROTATED IN OPPOSITE DIRECTIONS AT THE SAME VELOCITY THROUGH SAID TIMING GEARS, THERE IS SUBSTANTIALLY POINT CONTACT ONLY BETWEEN SAID IMPELLERS AT ALL POSITIONS OF RELATIVE ROTATION.