Шестерённые насосы внутреннего зацепления PGH-2X

Description Frame size 2, 3 Size 5 … 16 Component series 2X Maximum operating pressure 350 bar Maximum displacement 16 cm³ Features Fixed displacement Low operating noise Low flow pulsation High efficiency also at low speed and viscosity due to sealing gap compensation Suitable for broad viscosity and speed ranges All frame sizes and sizes can be arbitrarily combined Can be combined with internal gear pumps, radial piston pumps and external gear pumps Product description Set-up Hydraulic pumps of type PGH are gap-compensated internal gear pumps with constant displacement. They basically comprise of housing ( 1.1 ), bearing cover ( 1.2 ), internal gear ( 2 ), pinion shaft ( 3 ), plain bearings ( 4 ), axial washers ( 5 ), end cover ( 6 ), mounting flange ( 7 ) and stop pin ( 8 ), as well as the segment filler element ( 9 ) consisting of segment ( 9.1 ), segment support ( 9.2 ) and the seal rolls ( 9.3 ). Suction and displacement procedure The hydrodynamically supported pinion shaft ( 3 ) drives the internally geared internal gear ( 2 ) in the displayed direction of rotation. During the rotation, there is a volume increase over an angle of approx. 90° in the suction range. An underpressure results and fluid flows into the chambers. The sickle-shaped segment filler element ( 9 ) separates suction and pressure chamber. In the pressure chamber, the teeth of the pinion shaft ( 3 ) engage in the space between the teeth of the internal gear ( 2 ) again. The liquid is displaced via the pressure channel ( P ). Axial compensation The axial compensation force F A takes effect in the area of the pressure chamber and is generated with the pressure field ( 10 ) in the axial washers ( 5 ). So the axial longitudinal gaps between the rotating and the fixed parts are extraordinarily small and ensure perfect axial sealing of the pressure chamber. Radial compensation The radial compensation force F R acts on segment ( 9.1 ) and segment support ( 9.2 ). Dependent on the operating pressure, the two segment filler elements ( 9.1 ) and ( 9.2 ) are pressed against the head diameters of pinion shaft ( 3 ) and internal gear ( 2 ). The area ratios and the position of the seal rolls ( 9.3 ) between the segment and segment support are designed so that an almost leakage gap-free sealing between internal gear ( 2 ), segment filler element ( 9 ) and pinion shaft ( 3 ) is achieved. Spring elements under the seal rolls ( 9.3 ) ensure sufficient contact pressure, also with very low pressures. Hydrodynamic and hydrostatic mounting The forces acting on the pinion shaft ( 3 ) are accepted by hydrodynamically lubricated radial plain bearings ( 4 ); the forces acting on the internal gear ( 2 ) by the hydrostatic bearing ( 11 ). Gear tooth system The toothing is an involute tooth system. Its large meshing length results in little flow and pressure pulsation; these little pulsation rates considerably contribute to the low-noise running. PGH-type hydraulic pumps are gap-compensated internal