Diffuser Vane Mounting Position Adjustment for Pump Performance
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Solution Overview
Problem
The existing methods for setting the performance characteristic of mixed-flow pumps require new design of diffuser vanes, which is time-consuming and burdensome, making it difficult to shorten the manufacturing period while maintaining pump performance.
Innovation Solution
A method involving a hub and shroud configuration with radially arranged diffuser vanes, where the mounting position of each vane is set perpendicular to the radial direction to adjust the inlet angle without changing the bending curvature, allowing for easy setting of performance characteristics by offsetting from a basic mounting position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bending curvature of diffuser vanes is changed to set the inlet angle, then the performance characteristic of the pump can be set, but the optimal shape is changed and pump performance deteriorates
Solution Approach 1:
The patent changes the mounting position parameters of the diffuser vanes (radial position and circumferential position) rather than changing the bending curvature of the vanes themselves. This allows adjustment of the inlet angle and performance characteristics while maintaining the optimal shape and bending curvature of the vanes, thus avoiding performance deterioration.
2Adaptability or versatility
If diffuser vanes are newly designed according to desired performance characteristic, then the performance characteristic can be set, but it takes a tremendous burden and manufacturing period cannot be shortened
Solution Approach 1:
The patent performs preliminary design and optimization of the diffuser vane shape once, then stores this optimal design as a standard component. When performance adjustment is needed, instead of redesigning from scratch, the patent adjusts the mounting position of the pre-designed vanes, significantly reducing the time and burden required for performance characteristic setting.
Solution Approach 2:
The patent creates universal diffuser vanes with standardized optimal shapes that can be used across different pump configurations. By adjusting the mounting position of these universal vanes, different performance characteristics can be achieved without needing to design new vanes for each application, thus shortening the manufacturing period.
3Ease of manufacture
If the mounting position of diffuser vanes is changed to set performance characteristic, then the performance can be set simply, but the inlet angle changes which may affect performance
Solution Approach 1:
The patent systematically studies and establishes the relationship between mounting position parameters (radial position r and circumferential position θ) and the resulting inlet angle. By controlling these mounting position parameters within specific ranges, the patent achieves both simple performance setting and precise inlet angle control, resolving the contradiction between ease of manufacture and manufacturing precision.
Data Source
AI summary
To provide a method of setting a performance characteristic of a pump for setting a performance characteristic of a pump, the pump including an impeller that takes in fluid from a suction port and that sends out the fluid toward a discharge port, and a diffuser provided in a flow passage between the impeller and the discharge port, where the diffuser includes a hub arranged in a central portion of the flow passage, a shroud arranged around a periphery of the hub, and a plurality of diffuser vanes radially arranged from an outer peripheral surface of the hub toward an inner peripheral surface of the shroud, and the method includes a mounting-position setting step of setting a mounting position of each of the diffuser vanes to be mounted on the hub according to the performance characteristic of the pump in a direction perpendicular to a radial direction extending from the hub toward the shroud.