Fuel Filter Adapter Isolating Pressure Zones for Heat Exchanger Retrofit
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Solution Overview
Problem
The introduction of a fuel oil heat exchanger upstream of the first pump stage in fuel control systems for vehicles can cause a pressure drop, rendering the two-stage pump incapable of providing adequate fuel pressure, which is a regulatory requirement to prevent fuel icing conditions.
Innovation Solution
A fuel filter adapter with an adapter body featuring a non-permeable barrier to isolate high and low pressure zones, allowing for the connection of an external fuel system between the first and second pump stages without modifying the housing, thereby accommodating a fuel oil heat exchanger while maintaining adequate pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fuel oil heat exchanger is installed upstream of the first pump stage to prevent fuel icing, then fuel icing prevention is improved, but fuel pressure drops below adequate levels
Solution Approach 1:
The adapter serves as an intermediary device installed in the fuel filter housing that mediates between the first pump stage and the second pump stage. It includes a non-permeable barrier that isolates the high pressure zone (downstream of barrier) from the low pressure zone (upstream of barrier), allowing the heat exchanger to be positioned upstream without compromising the pressure required for combustor operation.
Solution Approach 2:
The adapter divides the fuel system into distinct pressure zones using a non-permeable barrier. The high pressure zone is isolated from the low pressure zone, enabling the heat exchanger to be positioned in the low pressure zone upstream of the first pump stage while maintaining adequate pressure in the high pressure zone downstream of the barrier for combustor operation.
2Object-affected harmful factors
If a fuel oil heat exchanger is installed upstream of the first pump stage to prevent fuel icing, then fuel icing prevention is improved, but the two stage pump becomes incapable of providing adequate fuel pressure
Solution Approach 1:
The adapter acts as a pressure-isolating intermediary that allows the heat exchanger to be positioned upstream of the first pump stage without transmitting the pressure drop back to the combustor side. The non-permeable barrier ensures that the second pump stage continues to receive fuel at adequate pressure, maintaining system reliability.
Solution Approach 2:
By segmenting the fuel system into isolated high and low pressure zones through the adapter barrier, the invention ensures that the heat exchanger installation upstream does not compromise the pressure adequacy downstream, thereby maintaining the reliability of fuel supply to the combustor.
3Object-affected harmful factors
If the fuel path is interrupted to place a fuel oil heat exchanger upstream of the first pump stage, then fuel icing prevention is improved, but pressure drop increases
Solution Approach 1:
The adapter serves as a pressure-isolating intermediary that limits the pressure drop to only the portion of the system upstream of the barrier. The non-permeable barrier prevents the pressure drop from propagating through the entire fuel system, thereby minimizing overall energy loss while still allowing the heat exchanger to be positioned upstream for icing prevention.
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
Enables the retrofitting of existing fuel control systems to include a fuel oil heat exchanger without compromising fuel pressure, ensuring reliable operation by maintaining the pressure necessary for combustor operation.
Implementation Method 1
an adapter body with a non-permeable barrier for isolating a high pressure zone from a low pressure zone
Implementation Method 2
a non-permeable barrier for isolating a high pressure zone from a low pressure zone
Data Source
AI summary
An adapter for retrofitting a fuel control system. The adapter has an outlet port and an inlet port for connecting to an external fuel system. The adapter replaces a standard fuel filter and fuel filter bowl.