Gear pump or motor

• US 3,280,756 A
• Filed: 12/21/1964
• Issued: 10/25/1966
• Est. Priority Date: 12/21/1964
• Status: Expired due to Term

• Current Assignee: Richard O. Gordon
• Original Assignee: Richard O. Gordon
• Inventors: Gordon, Richard O.
• Application Number:
  US04/419,753
• Time in Patent Office: 673 Days
• US Class Current: 418/74
• CPC Class Codes: F04C 15/0026 Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
• CPC Class Codes: F04C 15/06 Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Claims

1. IN A GEAR PUMP OR MOTOR, THE COMBINATION OF A PAIR OF MESHING ROTOR GEARS FORMING FLUID CONTAINING POCKETS BETWEEN THE GEAR TEETH, A HOUSING INCLUDING A PERIMETRIC WALL SURROUNDING THE GEARS AND FORMING A PUMP CHAMBER IN WHICH THE GEARS ARE ADAPTED TO ROTATE, SAID HOUSING INCLUDING INLET AND OUTLET FLUID CONDUITS AT OPPOSITE SIDES OF THE MESHING AXIS OF SAID GEARS, SAID INLET CONDUIT PROVIDING A PROGRESSIVE REDUCTION IN FLOW AREA IN THE DIRECTION OF FLUID FLOWING THERETHROUGH AND BEING FORMED AT THE EXIT THEREOF TO PROVIDE AN ELONGATED DIMENSION WHICH EXTENDS TRANSVERSELY OF THE GEARS A DISTANCE WHICH PERMITS FLUID FLOWING THROUGH SAID EXIT TO COMMUNICATE DIRECTLY WITH SUBSTANTIALLY THE ENTIRE ADJACENT PROJECTED AREA OF THE GEAR POCKET AND A DIMENSION NORMAL TO SAID ELONGATED DIMENSION WHICH TOGETHER WITH SAID LATTER DIMENSION FORMS AN EXIT FLOW AREA OF SUCH RESTRICTED SIZE AS TO PERMIT FLUID TO BE INJECTED AND SUBSTANTIALLY ENCLOSED BETWEEN EACH GEAR POCKET AND THE PERIMETRIC WALL FOLLOWING ROTATION OF A GEAR TOOTH THROUGH NOT MORE THAN 44* FROM THE AXIS OF MESHING OF THE GEARS WHEREBY TO EFFECT A RELATIVELY HIGH VELOCITY OF PRESSURE FLUID FLOWING THROUGH SAID EXIT AREA WHICH IN COMBINATION WITH THE RESULTANT LONG PUMPING PATH, MINIMIZES LEAKAGE OF DISCHARGE PRESSURE FLUID TO THE INLET CONDUIT, SAID PERIMETRIC WALL FORMING WITH THE TIPS OF THE GEAR TEETH A PERIPHERAL OR ANNULAR CLEARNACE FOR THE GEARS COMPRISING A FLOW PATH THROUGH WHICH PRESSURE FLUID MIGRATES DURING OPERATION FROM THE HIGH PRESSURE SIDE OF THE PUMP CHAMBER TOWARD THE LOW PRESSURE SIDE OF THE A LOCATION NEAR SAID EXIT AREA OF THE INLET CONDUIT FOR PRODUCING RADIALLY DIRECTED FLUID PRESSURE FORCES IN THE GEAR POCKETS NEAR THE SAID EXIT AREA SUCH THAT THE RESULTANT RADIAL FORCES ON ONE SIDE OF THE AXIS OF GEAR MESHING TEND TO COUNTERACT THE RESULTANT RADIAL FORCES ON THE OPPOSITE SIDE OF SAID AXIS, SAID EXIT AREA OF THE INLET CONDUIT BEING OF SUCH A SIZE AS TO ALSO EFFECT A VELOCITY OF THE FLUID FLOWING THERETHROUGH WHICH PRODUCES A FLUID IMPACT PRESSURE AT SAID EXIT AREA OF SUCH MAGNITUDE AS TO SUBSTANTIALLY COUNTERACT A TENDENCY OF THE FLUID IN THE PUMP CHAMBER TO BE EJECTED THEREFROM INTO THE INLET CONDUIT AS A RESULT OF THE ROTATION OF THE GEARS THEREIN.