Vane Pump Rotor Recesses for Pressure Pulsation Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vane pumps experience pressure pulsations due to the sequence of intake and displacement cycles, leading to reduced durability of sealing points and noise development in hydraulic systems, which existing geometries fail to adequately address.
Innovation Solution
A vane pump with a dynamic servo control geometry, featuring recesses on the rotor's face side, which modifies the volume change process within the vane cells to reduce pressure peaks and prevent hydraulic short-circuits, utilizing radial raisings and recesses to minimize closed volume displacement and maintain sealing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a static servo control geometry is incorporated on a fixed control plate to avoid fluctuations in pump outlet, then the conveyance pressure becomes more constant, but the volumetric efficiency of the pump deteriorates
Solution Approach 1:
The invention transitions from a static control plate geometry to a dynamic control geometry that rotates with the rotor. The control plate now includes radial raisings and recesses that rotate into position to control vane cell pressure dynamically during the intake and displacement cycles, maintaining both pressure stability and volumetric efficiency.
Solution Approach 2:
The radial raisings and recesses on the control plate are positioned to act on the vane cells in advance of the main pressure changes. By controlling the opening cross-section gradually before complete closure or opening, the system prepares for pressure transitions smoothly, preventing fluctuations while maintaining flow efficiency.
2Stress or pressure
If the opening cross-section is kept small to limit pressure increase within the vane cell, then pressure peaks are reduced, but the sealing effect deteriorates
Solution Approach 1:
The radial raisings and recesses create a gradual opening cross-section that begins to open before the vane cell is completely closed. This preliminary action allows pressure to equalize gradually, reducing pressure peaks while maintaining sufficient sealing during the critical transition phases.
Solution Approach 2:
The control geometry dynamically adjusts the opening cross-section based on the rotational position and pressure conditions. The system optimizes the balance between limiting pressure increase and maintaining sealing effect at each phase of the vane cell cycle.
Data Source
AI summary
The invention relates to a vane pump for conveying liquids, in particular viscous oils, which vane pump includes: a rotor having sliding slots in which movable vanes are held and can be countersunk in relation to a rotor radius (r); a pump housing including a pump chamber, which encloses the rotor; and an inlet and an outlet, which open into the pump chamber at at least one end face of the rotor; radial elevations protruding, with respect to the sliding slots, over the circumference of the rotor, which elevations form a rotor radius (r) on either side of the vanes that can be countersunk, and radial pockets being recessed, relative to the rotor radius (r), between the radial elevations. Within the radial elevations, recesses are formed on the at least one end face of the rotor at which the inlet and the outlet open, which recesses provide rotating anticipatory control geometry for reducing pressure spikes in the vane cells.