Drum Filter Liquid Level Control for Surface Area
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Solution Overview
Problem
Existing drum filters for liquid filtration, such as swimming pool water, are limited by the need to position a significant portion above the liquid level, reducing the effective filtration surface area and making maintenance difficult due to their size and projection above the water level.
Innovation Solution
A filtration system with a drum filter that includes a buffer reservoir and compression means to control gas pressure, allowing the drum filter to be positioned below the liquid level, maximizing the filtration surface area while maintaining conventional cleaning capabilities through controlled liquid level adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drum filter is positioned above the liquid level to enable conventional cleaning, then the cleaning function is maintained, but the effective filtration surface area is reduced
Solution Approach 1:
The patent applies the dynamics principle by making the liquid level adjustable rather than fixed. The compression means (pump) dynamically changes the liquid level in the housing to match the drum screen position, allowing the system to adapt between filtration mode (drum below liquid level for maximum surface area) and cleaning mode (drum above liquid level for conventional cleaning). This dynamic adjustment resolves the contradiction between maintaining cleaning capability and maximizing filtration surface area.
2Productivity
If a larger drum screen is used to increase filtration surface area, then the filtration capacity is improved, but the device size and maintenance difficulty increase
Solution Approach 1:
The patent applies pneumatics and hydraulics by using a compression means (pump) to control the liquid level in the housing. This hydraulic system allows the liquid level to be raised or lowered as needed, enabling the drum screen to be completely submerged during filtration to maximize filtration capacity without requiring an oversized drum. The pump system provides the mechanical advantage needed to move large volumes of liquid, resolving the contradiction between filtration capacity and device size.
3Reliability
If the drum filter projects greatly above the water level to function properly, then the filtration operation is maintained, but the system becomes difficult to reach for maintenance and creates nuisance for users
Solution Approach 1:
The patent applies the dynamics principle by making the liquid level adjustable rather than fixed. The compression means (pump) dynamically changes the liquid level in the housing to match the drum screen position, allowing the system to adapt between filtration mode (drum below liquid level for maximum surface area) and cleaning mode (drum above liquid level for conventional cleaning). This dynamic adjustment resolves the contradiction between maintaining cleaning capability and maximizing filtration surface area.
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 maximum use of the drum screen's filtration capacity with a smaller size, efficient particle collection, and reduced maintenance needs, as the system can maintain filtration and cleaning operations with a slightly smaller filtration surface area during cleaning.
Implementation Method 1
compression means for controlling a gas pressure in the housing of the drum filter and a gas pressure in the buffer reservoir
Implementation Method 2
a rotatable drum screen arranged in the housing... the liquid to be filtered, the influent, flows into the housing via the primary inlet and will subsequently flow through the drum screen
Implementation Method 3
the backflush element flushes the filtered particles out of the drum screen by means of a flushing liquid and into the opposite drainage gutter, after which it is discharged by gravity flow (force of gravity) via a secondary outlet in the housing
Data Source
Figure 1
Figure 2
AI summary
Filtration system for filtering a liquid, for examples swimming water, comprising a drum filter (2) provided with a primary inlet (4) and a primary outlet (6) in a housing (8), and a rotatable drum screen (10) arranged in the housing (8).A back flush element (12) is arranged on one side of the drum filter (2) for back flushing filtered particles from the drum screen (10), and a gutter element (14) is arranged on an opposite side of the drum screen (10) for collecting the filtered particles, wherein the gutter element (14) is connected to a secondary outlet (16) in the housing (2). The filtration system (1) is furthermore provided with a buffer reservoir (18) comprising a reservoir inlet (20) which is connected to the secondary outlet (16) so as to be closable. The filtration system (1) furthermore comprises compression means (34) for controlling a gas pressure (Pt) in the housing (8) of the drum filter (2) and a gas pressure (Pr) in the buffer reservoir (18).