Dual-Element Air Filter Bypass Layout for Low Pressure Loss
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Solution Overview
Problem
Existing air filters with two filter elements, such as prefilter and HEPA elements, require a large installation space and increased energy consumption due to the need for a sufficiently large bypass channel when the HEPA element is bypassed, leading to increased pressure loss and noise.
Innovation Solution
The air filter design incorporates two flat filter elements with an intrinsically changing height, forming a widening bypass channel between their outflow and inflow surfaces, allowing for a compact construction and minimal flow resistance by reducing the height of the filter medium body in the bypass channel region, and utilizing a flow guiding device to selectively bypass the HEPA element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the bypass channel is dimensioned sufficiently large to allow bypassing the HEPA filter element, then the fine filter element can be bypassed to reduce pressure loss and energy consumption, but the installation space requirement of the air filter is enlarged
Solution Approach 1:
The filter elements are arranged at an angle to each other instead of parallel, creating a three-dimensional bypass channel that utilizes vertical space. The second filter element is positioned at an angle relative to the first, allowing the bypass channel to extend in multiple dimensions rather than requiring additional horizontal or vertical space in a single plane.
Solution Approach 2:
The bypass channel is integrated within the compact arrangement of the two angled filter elements, nesting the bypass function within the existing filter element configuration. The bypass channel occupies the space between the angled filter elements, utilizing otherwise wasted space in the filter assembly.
2Adaptability or versatility
If two filter elements are positioned at a slant to form a widening bypass channel, then the bypass function is enabled, but the device complexity increases due to the need for a bypass flap and flow guiding device
Solution Approach 1:
The bypass flap is designed to be movable rather than fixed, allowing it to dynamically adjust the bypass channel opening based on operational requirements. The flap can be positioned to either open or close the bypass channel, providing adaptive flow control without requiring a complex valve mechanism.
Solution Approach 2:
The bypass flap serves multiple functions: it controls the bypass channel opening, guides air flow direction, and can be integrated with the filter element mounting structure. This multi-functionality reduces the need for separate components and simplifies the overall device complexity.
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 installation space requirements and minimizes flow resistance, lowering energy consumption and noise while maintaining effective filtration performance.
Implementation Method 1
minimizes flow resistance, lowering energy consumption and noise
Implementation Method 2
two filter elements which are each embodied as a flat filter element and comprise a filter medium body with an inflow surface and an outflow surface
Data Source
AI summary
An air filter has a filter housing. A first flat filter element and a second flat filter element, each having a filter medium body with an inflow surface and an outflow surface, are arranged in the filter housing. A flow guiding device selectively guides an air flow to be filtered through the first flat filter element and the second flat filter element in series or at least partially past the second flat filter element. The outflow surface of the first flat filter element and the inflow surface of the second flat filter element are spaced apart from each other and form a widening bypass channel. The filter medium body of at least one of the first flat filter element and the second flat filter element has an intrinsically changing height and has a reduced height in a region of a larger width of the bypass channel.