Italian Oleodynamic Technology Gear pumps manufacturer since 1957 ULTRA POMPE Srl Home Technology Products Download Gallery Contact
ULTRA POMPE S.r.l. - Via Goldoni 37, Trezzano sul Naviglio 20090, Milano, Italia - VAT number 00210510152

Gear pumps

Sono usate in tutte quelle applicazioni in cui il fluido è viscoso purché non sia dannoso alla pompa  stessa, in funzione dello scorrimento tra le parti componenti.   Queste pompe sfruttano la variazione di volume causata dall'ingranamento dei denti di due ruote  dentate. In the operating scheme is shown how the rotations of the gears displace the product from the  inlet side to the outlet side. The entire operation can be resumed in three phase: Suction, Delivery and  Discharge.    Into a gear pumps the two rotors, that are respectively called driving and driven rotor, are seated in a  body that round them from all side. On the both sides of the mesh zone of the teeth there is a hole in the  body of the pump. These holes are respectively called suction and discharge.   Spinning the rotors the fluid is moved, through the chambers between the teeth of the rotors and the  body, from the suction side to the discharge side. Fluid does not pass through the meshing zone of the  gears due to small tolerances.  A back-flow of the fluid is blocked by the contact of the teeth of the two  rotors in the meshing zone. Obviously presences of solid particles inside the media prejudice this  process.

Advantages

Gear pumps need a lesser Npsh (showing a better negative suction head) and have better properties of  delivery repeatability   Gear pumps, being rotary volumetric pumps, are the best metering pumps, since their delivery depends  directly on the revolutions rate. Also gear pumps will not generate flow pulsations, as standard metering  pumps do, making the media flow constant.    Gear pumps delivery and revolution ratio won’t be affected by use and work, if provided viscosity and  differential pressure are kept constant. Any small delivery loss, due to normal wear and wear of the  rotating parts, will be easily corrected and compensated for by an equally slight rise in revolution rate. 
Technology