Fuel Tank Baffle Pot Seal for Ejector Pump Deflection
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Solution Overview
Problem
Existing fuel delivery units in motor vehicles face operational challenges due to external loads causing the ejector pump to lift, leading to incomplete sealing and a collapse in delivery capacity, especially during dynamic driving conditions.
Innovation Solution
A seal with a radially outwardly directed sealing lip is designed to maintain contact with the surge chamber base even under maximum deflection, ensuring reliable sealing and pressure equalization, and can be detachably connected to prevent lifting, allowing for flexibility and secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ejector pump is mechanically connected to the fuel pump, then fuel delivery is improved, but the ejector pump lifts under external loads causing sealing failure
Solution Approach 1:
A seal is introduced as an intermediary element between the ejector pump and the surge chamber base. This seal maintains the sealing function even when the ejector pump lifts under external loads, allowing the mechanical connection between ejector pump and fuel pump to remain while preventing sealing failure.
Solution Approach 2:
The seal is designed as a flexible component that can accommodate the lifting movement of the ejector pump under external loads. The flexible nature of the seal allows it to maintain contact and sealing while deforming to absorb the displacement, preventing complete sealing failure.
2Reliability
If the seal is made flexible to accommodate pump movement, then sealing reliability improves, but the seal may detach from the surge chamber base
Solution Approach 1:
The seal is segmented into different functional zones: a flexible sealing lip region that accommodates pump movement, and a stable mounting region with attachment elements (such as a bead or locking features) that anchors the seal to the surge chamber base. This segmentation allows simultaneous flexibility for sealing and stability for positioning.
Solution Approach 2:
The seal design extends into the radial dimension with a bead or attachment feature that engages with the surge chamber base. This radial extension provides an additional degree of freedom for the seal to accommodate axial lifting while maintaining radial stability through the engagement feature.
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
The solution ensures consistent negative pressure for fuel pumping, maintaining fuel delivery capacity under varying loads and simplifies the suspension system, providing reliable operation and easy assembly.
Implementation Method 1
A seal (16) surrounding the opening (11) is arranged on the intake area (10) and surrounding the opening (11) at such a distance, with which the opening (11) is surrounded by the seal (16) when the suction area (10) of the ejector pump (8) is displaced or pivoted.
Implementation Method 2
the ejector pump (8) for conveying fuel from the fuel tank (4) into the surge pot (1), the ejector pump (8) having an intake area (10) which is connected to the opening (11) in the surge pot (1)
Data Source
AI summary
Supply unit has a baffle pot (1), which has an opening in its base or within the lower area of its side wall. A sealing (16) surrounding the opening (11) is arranged in the intake area (10). The sealing surrounds the opening at a distance so that during the displacement or swiveling of the intake area of the sucking jet pump (8), the opening is surrounded by the sealing. A fuel pump (2) is provided in the baffle pot for delivering the fuel from the baffle pot. A sucking jet pump, provided in the baffle pot, is connected mechanically with the fuel pump for delivering the fuel from the fuel tank to the baffle pot. The sucking jet pump has an intake area, which is connected with the opening in the baffle pot.