Electrically Driven Pump Impeller Blades for Low-Speed Flow and Lift
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Solution Overview
Problem
Conventional electrically driven pumps face challenges in achieving high lift and high efficiency at low specific speed and low flow rate due to their small dimensions, which limits their performance in heat circulating systems.
Innovation Solution
The electrically driven pump features an impeller design with first and second blades arranged between an upper and lower plate, where the second blades have a diameter ranging from 60% to 75% of the first circumference, enhancing flow rate and lift while improving hydraulic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the impeller diameter is reduced to achieve compact dimensions, then the pump size is reduced, but the lift and hydraulic efficiency at low specific speed and low flow rate deteriorate
Solution Approach 1:
The impeller is segmented into multiple functional regions with different blade configurations. The first blades extend from the first circumference to the second circumference, while the second blades extend from the second circumference to the outer peripheral surface. This segmentation allows each region to optimize flow characteristics for compact size while maintaining hydraulic efficiency at low specific speed and low flow rate conditions.
Solution Approach 2:
The patent introduces a multi-dimensional blade arrangement where blades are positioned at different radial distances from the center axis. The first blades are located at the inner radius (first circumference) and the second blades are located at the outer radius (second circumference with diameter 60-75% of first circumference). This dimensional arrangement increases the effective impeller area without increasing the overall impeller diameter, thereby maintaining compact size while improving hydraulic efficiency.
2Volume of moving object
If the impeller diameter is reduced to achieve compact dimensions, then the pump size is reduced, but the flow rate and lift at low speed deteriorate
Solution Approach 1:
The impeller is divided into multiple blade sets (first blades and second blades) at different radial positions. This segmentation allows the pump to maintain adequate flow rate at low speed by creating multiple flow paths through the impeller, with the first blades handling inner radius flow and the second blades handling outer radius flow, thereby compensating for the reduced overall impeller diameter.
Solution Approach 2:
Different regions of the impeller are given different local qualities through the blade configuration. The first blades at the inner circumference and the second blades at the outer circumference have different geometries optimized for their respective locations. This local optimization ensures that each region contributes effectively to the overall flow rate, maintaining productivity despite the compact size.
Data Source
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AI summary
An electrically driven pump is provided, which includes an impeller. The impeller includes an upper plate, blades and a lower plate, and the blades and the upper plate are integrally formed by injection molding. The blades are formed on a lower surface of the upper plate, the blades include first blades and second blades, and a length of each of the first blades is greater than a length of each of the second blades. The first blades are uniformly distributed along a circumference of the upper plate, and the first blades and the second blades are distributed alternately in a circumferential direction of the upper plate. Each of the first blades includes a first head portion and a first tail portion, the second blade includes a second head portion and a second tail portion, and each of the first tail portion and the second tail portion is aligned with an outer edge of the upper plate. The outer edge of the upper plate defines a first circumference with a diameter of Φ1, the second head portions of the second blades are located on a second circumference with a diameter of Φ2, and the diameter Φ2 of the second circumference ranges from 60 percent to 75 percent of the diameter Φ1 of the first circumference. The impeller arranged in such manner facilitates the improvement of a hydraulic efficiency and a lift.