Feed Pump Filter Connecting Piece for Fuel Outgassing
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Solution Overview
Problem
Existing feed pumps experience reduced delivery capacity due to excessive gas bubble formation when pumping hot fuel, which is exacerbated by the need for a calming area that shortens the annular channel required for pressure build-up.
Innovation Solution
The filter's connecting piece features a cross-section that decreases in the direction of flow, allowing for a longer fuel flow area that reduces turbulence and outgassing, eliminating the need for a calming area in the annular channel, and ensuring a smooth transition without edges or cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a calming area is provided between the intake port and compression area, then outgassing of fuel is reduced, but the effective length of the partially annular channel is reduced, which impairs pressure build-up
Solution Approach 1:
The invention merges the calming function with the connecting piece of the filter by designing it with a continuously decreasing cross-section in the flow direction. This integration eliminates the need for a separate calming area within the annular channel, thereby preserving the full channel length for pressure build-up while still achieving flow calming through the geometric design of the connecting piece
Solution Approach 2:
The calming function is shifted from the annular channel dimension to the connecting piece dimension. By designing the connecting piece with a continuously decreasing cross-section, the calming effect is achieved in a different spatial location, allowing the annular channel to maintain its full length for compression without sacrificing outgassing reduction
2Object-generated harmful factors
If the annular channel is shortened to accommodate a calming area, then outgassing is reduced, but the pressure build-up capability is impaired
Solution Approach 1:
The calming function is merged into the connecting piece design rather than being implemented as a separate feature in the annular channel. The continuously decreasing cross-section of the connecting piece provides the calming effect, allowing the annular channel to maintain its full length and compression capability
Solution Approach 2:
The connecting piece acts as an intermediary element that performs the calming function before fuel enters the annular channel. By placing the calming geometry in the connecting piece, the system achieves both outgassing reduction and preserved pressure build-up capability in the annular channel
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 enhances the high-temperature delivery properties of the feed pump by minimizing fuel outgassing and maintaining a longer channel length for pressure build-up, resulting in improved fuel guidance and compression.
Implementation Method 1
The area in the filter with a cross-section that decreases in the direction of flow also leads to compression of the fuel
Implementation Method 2
The constant transition of the flow cross-sections from the connection piece of the filter and from the inlet channel of the feed pump also contributes to calming the flowing fuel, since turbulence is avoided due to the absence of edges or cracks
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a feed pump (2) having a driven impeller (12) rotating in a pump housing (11), the impeller having at least one ring (16-19) of rotor blades (20-23) limiting blade chambers, and having at least one channel (24-27) in a circular segment form that is disposed in a region of the rotor blades (20-23) in the pump housing (11), which together with the blade chambers forms a feed chamber provided for the feeding of a fluid from an inlet channel (28), (38) to an outlet channel, and a filter (6) having a connecting piece (7), wherein the connecting piece (7) is connected to the inlet channel (28), (38) of the feed pump (2). The connecting piece (7) of the filter (6) has a region (32) having a cross-section that is reduced in the direction of the flow and the transition of the flow cross-section of the connecting piece (7) towards the flow cross-section of the inlet channel (28) is configured continuously.