Regenerative Pump Flow Channel Curvature Optimization
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Solution Overview
Problem
Regenerative pumps suffer from loud noise, low outflow capacity, and efficiency due to severe flowing disturbances between vanes and fluid, caused by small curvature radii and whirl areas in existing flow channel designs.
Innovation Solution
The new design features a closed impeller with a larger vane root thickness, an inclined trailing edge, and a shroud plate that separates the whirl area from the vanes, increasing the curvature radius and reducing disturbances, while the maximum width of the flow channel near the leading edge provides more space for smooth flow and reduces noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flow channel has a small curvature radius at the leading edge, then the pump size can be reduced, but the flow disturbance increases and efficiency decreases
Solution Approach 1:
The patent applies curvature optimization by designing the flow channel with a specific curvature radius at the leading edge. The curvature radius R1 is set to satisfy 0.05D1 < R1 < 0.15D1, where D1 is the inlet diameter. This optimized curvature allows the fluid to follow the flow channel more smoothly, reducing flow separation and turbulence, thereby increasing outflow capacity without significantly increasing pump size.
2Device complexity
If the flow channel has a small curvature radius at the trailing edge, then the pump structure can be compact, but the flow disturbance increases and noise increases
Solution Approach 1:
The patent optimizes the trailing edge curvature radius R2 to satisfy 0.1D2 < R2 < 0.3D2, where D2 is the outlet diameter. This larger curvature radius at the trailing edge reduces flow separation and turbulence as fluid exits the impeller, thereby reducing noise generation while maintaining a relatively compact structure.
Solution Approach 2:
The patent applies different curvature radius requirements to different locations of the flow channel. The leading edge has a smaller curvature radius (0.05D1 < R1 < 0.15D1) while the trailing edge has a larger curvature radius (0.1D2 < R2 < 0.3D2). This localized optimization addresses different flow conditions at different locations, reducing noise at the trailing edge while maintaining compactness.
3Productivity
If the width of the flow channel is increased near the leading edge, then the curvature radius can be enlarged and flow can be smoothed, but the pump size increases
Solution Approach 1:
The patent defines the maximum width B3 of the flow channel at the leading edge to satisfy 0.15D1 < B3 < 0.35D1, where D1 is the inlet diameter. This localized width optimization provides sufficient space for smooth flow at the critical leading edge region without significantly increasing the overall pump volume. The width is specifically optimized where it is most needed for flow smoothing.
Data Source
AI summary
The present invention provides an improvement in a new structure of a regenerative pump, including a cross section structure of the flow channel of a pump casing and closed type impeller, whereby to improve a better flow model for pump performance to solve problems of noise, and to increase the outflow capacity and higher efficiency.