Fuel Ejector Pump Inclined Ramp Turbulence Reduction
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Solution Overview
Problem
Existing fuel delivery devices, such as ejector pumps, experience reduced delivery capacity due to flow turbulence and gas bubble formation, especially with heated fuels, leading to insufficient filling of the storage pot in certain operating conditions.
Innovation Solution
The introduction of an inclined ramp for low-turbulence flow guidance at the transition from the suction chamber to the mixing channel, where the suction opening and entrance into the mixing channel are arranged at different levels, reduces flow turbulence and gas bubble formation, enhancing the suction capacity of the ejector pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an ejector pump is used to deliver fuel, then fuel delivery is achieved, but flow turbulence causes gas bubble formation that reduces delivery capacity
Solution Approach 1:
The patent applies curved flow guidance surfaces instead of sharp edges or abrupt transitions. The flow guidance element features a curved surface that gradually directs fuel flow from the suction chamber into the mixing channel, reducing turbulence and preventing gas bubble formation while maintaining delivery capacity.
Solution Approach 2:
The patent modifies the flow parameters by introducing a flow guidance element that changes the flow direction gradually. This element alters the velocity distribution and flow pattern in the transition zone, reducing turbulence intensity and preventing bubble formation without sacrificing pump performance.
2Productivity
If the suction chamber and mixing channel are connected directly, then simple structure is achieved, but flow turbulence increases and reduces suction capacity
Solution Approach 1:
The flow guidance element introduces a curved transition surface between the suction chamber and mixing channel. This curved geometry smoothly guides fuel flow, reducing turbulence and enhancing suction capacity while adding minimal structural complexity through a single integrated component.
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 design reduces gas bubbles in the fuel, thereby increasing the fuel delivery capacity and ensuring the storage pot is adequately filled, even under conditions like driving uphill or low fuel levels.
Implementation Method 1
flow turbulence is reduced and the suction capacity of the ejector pump is increased by reducing the formation of gas bubbles
Implementation Method 2
drive line 8 opens out via a jet outlet 14 that is narrowed, for example, into a suction chamber 15 of the ejector pump 9
Data Source
Figure 1
Figure 2
AI summary
Devices for feeding fuel are already known which have a storage pot which can be filled by means of a suction jet pump and which has a pot base with an intake opening which opens into an intake chamber of the suction jet pump and through which the suction jet pump sucks in fuel, wherein the intake chamber is fluidically connected to the storage pot via a mixer duct. A non-return valve is provided in the intake opening in order to prevent fuel from flowing back. Considerable flow turbulence occurs within the suction jet pump, which flow turbulence can lead, in particular in the case of heated fuel, referred to as hot petrol, to the formation of gas bubbles. The delivery capacity of the suction jet pump is considerably reduced by the gas bubbles, with the result that under certain operating conditions the storage pot is not sufficiently filled and can run empty. In the device according to the invention, the flow turbulence is reduced. The invention provides that an oblique ramp (20) for guiding the flow with little turbulence is provided at the junction (23) with the mixer duct (16) on the pot base (6) of the storage pot (5) inside the intake chamber (15).