Impeller Vane Groove Inclining Angles for Fuel Pump Efficiency
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Solution Overview
Problem
Existing fuel pumps face challenges in enhancing discharge pressure and pump efficiency while minimizing energy consumption, as increasing electricity supply to fuel pumps leads to increased energy consumption and inefficient fuel pressurization.
Innovation Solution
The design of an impeller with radially inclined back surfaces and forward surfaces in vane grooves, where the backward inclining angle α ranges from 15° to 30° and the forward inclining angle β ranges from 60°, optimizing the flow of fuel through the pump passages to enhance pump efficiency without excessive energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If electricity supply to motor portion is increased to enhance discharge pressure, then discharge pressure is improved, but energy consumption increases
Solution Approach 1:
The invention changes the geometric parameters of the impeller, specifically the inclining angles of the back surfaces of partition walls (backward inclining angle α and forward inclining angle β). By optimizing these angles within specific ranges (15°≦α≦30°, β≦60°, and 1≦β/α≦4), the pump efficiency is improved, allowing higher discharge pressure to be achieved with the same motor power, thus resolving the contradiction between discharge pressure and energy consumption
2Stress or pressure
If pump efficiency is enhanced to increase discharge pressure, then discharge pressure is improved, but device complexity increases
Solution Approach 1:
The invention applies local quality by making the back surfaces of partition walls have specific inclining characteristics in certain regions. The radially inner side of each back surface has a backward inclining angle α, while the surface is inclined forwardly from the thickness-center toward thickness-ends with angle β. This localized geometric optimization improves pump efficiency without requiring complex overall impeller redesign
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures efficient fuel pressurization by maintaining maximum pump efficiency within specified angle ranges, reducing resistance and enhancing the discharge pressure and amount of fuel without increasing energy consumption, thus improving the overall performance of the fuel pump.
Implementation Method 1
At least the radially inner side of the back surface is radially outwardly inclined backwardly with respect to the rotative direction
Implementation Method 2
The back surface is inclined from the thickness-center toward both the thickness-ends forwardly with respect to the rotative direction
Implementation Method 3
The cross section of the flow passage is gradually reduced from the inlet toward the pump passage so as to enhance efficiency of the pump portion
Data Source
AI summary
An impeller includes vane grooves arranged with respect to the rotative direction. At least the radially inner side of a back surface of each vane groove is radially outwardly inclined backwardly with respect to the rotative direction. The back surface has a radially inner end and a radially outer end, which are connected via a line segment. The line segment and a radius of the impeller define a backward inclining angle α therebetween. The back surface is inclined from a thickness center of the impeller toward each thickness-end of the impeller forwardly with respect to the rotative direction. The thickness-center and the thickness-end are connected via a line segment. The line segment and the thickness-center define a forward inclining angle β therebetween. The angle α, β satisfy the following relationships: 15°≦α≦30°; β≦60°; and 1≦β/α≦4.