Sliding Vane Pump Rotor Asymmetric Grooves High Speed
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Solution Overview
Problem
Vane cell pumps experience high power losses, increased noise, and wear at high rotation speeds (4500 rpm to beyond 6000 rpm due to incomplete filling of cell chambers and resulting cavitation phenomena.
Innovation Solution
The design features non-symmetrical transverse grooves at the lower edge of each cell chamber, with a low point behind the cell chamber center axis, optimizing flow and reducing friction, ensuring complete and fast filling and emptying of chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If symmetrical transverse grooves are used in cell chambers, then manufacturing is simplified, but power losses and noise increase at high rotation speeds due to incomplete chamber filling
Solution Approach 1:
The patent applies asymmetry by configuring the transverse grooves with a non-symmetrical cross-section progression, where the low point is offset behind the cell chamber center axis in the direction of rotation. This asymmetric design optimizes fluid flow into the cell chambers, ensuring complete filling at high rotation speeds and eliminating cavitation, thereby reducing power losses while maintaining manufacturability.
2Ease of manufacture
If symmetrical transverse grooves are used in cell chambers, then manufacturing is simplified, but noise increases at high rotation speeds due to cavitation
Solution Approach 1:
The asymmetric groove configuration with the low point offset behind the center axis ensures complete and smooth filling of the cell chambers, preventing cavitation phenomena. This eliminates the noise generated by cavitation while maintaining the simplicity of groove manufacturing through standardized machining processes.
3Ease of manufacture
If symmetrical transverse grooves are used in cell chambers, then manufacturing is simplified, but wear increases at high rotation speeds
Solution Approach 1:
The non-symmetrical groove design ensures complete filling of cell chambers without cavitation, which prevents the harmful effects of cavitation on rotor and stator surfaces. This eliminates wear caused by cavitation at high rotation speeds while maintaining ease of manufacture through conventional machining methods.
4Shape
If the low point of transverse groove is positioned at the center axis, then flow symmetry is maintained, but filling speed is insufficient at high rotation speeds
Solution Approach 1:
The patent positions the low point of the transverse groove behind the cell chamber center axis in the direction of rotation, creating an asymmetric flow pattern that accelerates fluid entry into the chamber. This asymmetric configuration increases filling speed at high rotation speeds while the groove geometry maintains adequate flow symmetry for balanced operation.
Data Source
AI summary
A vane cell pump has a rotor mounted in a pump housing and driven by a shaft, multiple vane plates mounted in the outer circumference of this rotor, and an outer ring that surrounds the rotor and the vane plates, whereby this ring is disposed either directly in the pump housing, or in a setting ring that can be moved in the pump housing, along predetermined paths. The vane cell pump has transverse grooves disposed in the cylinder mantle surface of the rotor, between the bearing grooves of the vane plates, running over the entire rotor width, disposed parallel to the bearing grooves of the vane plates, spaced apart from the bearing grooves by a bearing crosspiece. These transverse grooves have a non-symmetrical cross-section progression, which has a low point in each cell chamber, which point is always disposed behind the cell chamber center axis, seen in the direction of rotation.