Modified cycloidal impeller

• US 3,371,856 A
• Filed: 03/24/1966
• Issued: 03/05/1968
• Est. Priority Date: 03/24/1966
• Status: Expired due to Term

• Current Assignee: Francis H. Thelen, Thomas M. Thomas
• Original Assignee: Francis H. Thelen, Thomas M. Thomas
• Inventors: Thelen, Francis H., Thomas, Thomas M.
• Application Number:
  US04/537,209
• Time in Patent Office: 712 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 FOR THE ROTARY POSITIVE DISPLACEMENT TYPE COMPRISING A PAIR OF LOBED IMPELLERS MOUNTED ON PARALLEL SHAFTS AND ROTATABLE AT A CONTACT VELOCITY RATIO, EACH OF SAID IMPELLERS HAVING A CENTRAL WAIST PORTION ADAPTED TO BE MOUNTED ON ONE OF SAID SHAFTS AND A PLURALITY OUTWARDLY FROM SAID WAIST PORTION, THE EXTENDING RADIALLY OUTWARDLY FROM SAID WAIST PORTION, THE PROFILE OF EACH OF SAID IMPELLERS CONSISTING OF A LIKE PLURALITY OF IDENTICAL CONVEX CIRCULAR ARCS OF UNIFORM RADIUS DEFINING SAID LOBE PORTIONS AND A LIKE PLURALITY OF IDENTICAL CONCAVE NON-CIRCULAR CURVES DEFINING SAID WAIST PORTION, EACH OF SAID ARCS SUBTENDING AN ANGLE AT THE AXIS OF THE IMPELLER SHAFT EQUAL TO 360*/2N, WHERE N IS THE NUMBER OF SAID LOBE PORTIONS, AND EACH OF SAID THAT, WHEN CULAR CURVES BEING GENERATED FROM A CIRCULAR ARC IDENTICAL WITH THOSE DEFINING SAID LOBE PORTIONS SO THAT, WHEN SAID IMPELLERS ARE ROTATED IN OPPOSITE DIRECTIONS AT THE SAME VELOCITY, THERE IS SUBSTANTIALLY POINT CONTACT BETWEEN SAID IMPELLERS AT ALL POSITIONS OF RELATIVE ROTATION.