Filter Venting with Drain Passage and Restriction
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Solution Overview
Problem
Existing liquid filter systems face challenges in effectively venting air during maintenance or when the system runs empty, as previous solutions like vent orifices can become clogged with dirty fuel, preventing efficient air evacuation and potentially causing performance issues in downstream engine components.
Innovation Solution
The filter apparatus and element feature a design with a main flow passage and a drain flow passage, each with dedicated outlets, where the drain flow passage includes a restriction to allow gas flow while preventing liquid flow, ensuring air is evacuated without contaminating the clean fuel side and maintaining system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent orifice is provided in the end cap to evacuate air from the filter, then air evacuation is enabled, but the vent orifice can be easily clogged by dirty fuel preventing air evacuation
Solution Approach 1:
The invention divides the flow outlet into two separate outlets: a main flow outlet for liquid fuel and a drain flow outlet for air evacuation. This segmentation allows each outlet to serve its specific function independently, preventing contamination of the air evacuation path by dirty fuel while maintaining reliable air evacuation capability.
Solution Approach 2:
The drain flow passage acts as an intermediary pathway that allows air to escape without exposing it to the dirty fuel side. The passage includes a restriction that mediates between the need for air evacuation and the need to prevent fuel leakage, permitting gas flow while substantially prohibiting liquid flow.
2Reliability
If a drain flow outlet is provided separate from the main flow outlet, then air can be vented without clogging the main outlet, but the device complexity increases
Solution Approach 1:
The drain flow passage serves multiple functions: it provides a dedicated path for air evacuation, prevents clogging of the main flow outlet, and includes a restriction that automatically regulates flow based on fluid type (gas vs. liquid). This multi-functionality reduces the need for additional complex components like check valves or separate venting mechanisms.
3Reliability
If the drain flow passage includes a restriction to permit gas flow but prohibit liquid flow, then air evacuation is enabled without fuel bypass, but manufacturing precision requirements increase
Solution Approach 1:
The restriction in the drain flow passage has specific local dimensions designed to exploit the physical difference between gas and liquid flow. The restriction size is optimized to permit gas flow while substantially prohibiting liquid flow, creating a localized functional property that achieves the desired separation without requiring complex control mechanisms.
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 effectively vents air from the filter system without allowing dirty fuel to bypass the filter media, preventing clogging and ensuring efficient operation by separating air evacuation from clean fuel flow, thus maintaining system performance and preventing air from entering downstream components.
Implementation Method 1
The drain flow passage includes a restriction sized to permit gas flow but that is sized to substantially prohibit liquid flow
Data Source
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AI summary
A filter apparatus and filter element therefore are provided. The filter apparatus includes a filter head including an inlet port, a main flow outlet port and a drain flow outlet port. The filter element includes a ring of filter media defining an internal cavity. The filter element defines a main flow passage and a drain flow passage through the internal cavity. Each flow passage has an inlet on a clean side of the filter media directly fluidly communicating with the internal cavity. The main flow passage is fluidly coupled to the main flow outlet port. The drain flow passage (or air bleed passage) is fluidly coupled to the drain flow outlet port and includes (i) a restriction 154 sized large enough to allow air flow and small enough to prevent substantial liquid flow and (ii) a check valve 912 limiting flow to a single direction. The filter media separates the inlet port from the main flow and drain flow outlet ports.