Positive-displacement rotary pump
OwnerMario Antonio Morselliinventor
Life of this patent
Estimating the term…
Abstract
A positive-displacement rotary pump comprising a pair of meshing gears (13, 14) or rotors, consisting of a driving gear and a driven gear, contained in a shell (10) having an output opening and an intake opening for a fluid. The gears (13, 14) include shafts (23, 24) which are supported by bushings (15a, 15b) having two faces (17a, 17b) which are subjected, in use, to pressures which bring about an axial load on the bushing itself, wherein the resultant of the axial loads (S′, S″) on the two bushings has a predetermined direction so as to move the bushings (15a, 15b) and the gears (13, 14) as a whole into close abutment with a predetermined reference plane (VI—VI).
Claims9
Positive-displacement rotary pump comprising a pair of meshing gears defining a driving gear and a driven gear, which are contained in a shell having an output opening and an intake opening for a fluid, the gears having shafts which are supported by bushings having two faces subjected, to pressures which bring about an axial load (S′, S″) on the bushing itself, the resultant of the axial loads (S′, S″) on the two bushings having a predetermined direction so as to move the bushings and the gears as a whole into close abutment with a predetermined reference plane, said gears having meshing helical teeth, and a system for compensating for the loads including axial load means which act on the same end of each shaft of the gears, the axial load means causing, an axial load (S″′) on the gears which prevails over the axial forces produced by the meshing and having the same direction as the resultant of the axial loads (S′, S″) on the bushings.
Positive-displacement rotary pump comprising a pair of meshing gears defining a driving gear and a driven gear, which are contained in a shell having an output opening and an intake opening for a fluid, the gears having shafts which are supported by bushings having two faces subjected, to pressures which bring about an axial load (S′, S″) on the bushing itself, wherein the resultant of the axial loads (S′, S″) on the two bushings has a predetermined direction so as to move the bushings and the gears as a whole into close abutment with a predetermined reference plane, wherein at least one bushing comprises at least two separate pieces, each of which supports in rotation an end of one of the two shafts of the gears, and wherein at least one longitudinal channel is provided on the flanks of each separate piece of the at least one bushing and promotes the distribution of the output pressure over the flanks of the bushing, so as to keep the two separate pieces close together.
Positive-displacement rotary pump comprising a pair of meshing gears defining a driving gear and a driven gear, which are contained in a shell having an output opening and an intake opening for a fluid, the gears having shafts which are supported by bushings having two faces subjected, to pressures which bring about an axial load (S′, S″) on the bushing itself, wherein the resultant of the axial loads (S′, S″) on the two bushings has a predetermined direction so as to move the bushings and the gears as a whole into close abutment with a predetermined reference plane, the outer face of one of the two bushings is directed towards the reference plane and is affected only by the intake pressure (PMIN), a portion (PMAX) of the outer face of the other one of the two bushings is affected by the output pressure (M), the portion (PMAX) being separated from the remaining portion of the outer face, which is affected by the intake pressure (A), by a separating seal which is connected to a plate directed towards the outer face of said other bushing, in such a manner that the resultant of the pressures on the outer face of said other bushing is constantly greater than the resultant of the pressures acting on the inner face.
Positive-displacement rotary pump comprising a pair of meshing gears defining a driving gear and a driven gear, which are contained in a shell having an output opening and an intake opening for a fluid, the gears having shafts which are supported by bushings having two faces subjected, to pressures which bring about an axial load (S′, S″) on the bushing itself, wherein the resultant of the axial loads (S′, S″) on the two bushings has a predetermined direction so as to move the bushings and the gears as a whole into close abutment with a predetermined reference plane, and wherein depressions or localized channels are provided on one of the two faces of at least one of the bushings in order to allow the hydrodynamic lubrication thereof.
Dependencies are inferred from the claim text.