Balanced Filter Cleaning Mechanism for Axial Force Reduction
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Solution Overview
Problem
Existing screen filters face unbalancing forces during the cleaning process due to pressure differences, leading to increased friction, wear, and reduced system efficiency and reliability.
Innovation Solution
A balanced cleaning system is implemented using a symmetrical filter configuration with two screen filter members connected by a shaft-like core, where the core extends through a common flush chamber and is exposed to similar pressure conditions at both ends, balancing axial forces and reducing exposure to axial forces during cleaning operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single screen filter with suction-based cleaning mechanism is used, then the cleaning function is achieved, but unbalancing axial forces occur during cleaning leading to increased friction and wear
Solution Approach 1:
The patent applies asymmetry by using a bi-directional screw mechanism that converts single-direction rotation into bi-directional axial movement. The screw thread geometry creates asymmetric force distribution that balances axial forces on the suction shaft during reciprocating cleaning strokes, reducing net axial force and friction on bearing surfaces.
Solution Approach 2:
The patent implements dynamics by transitioning from a static single-position nozzle to a dynamic reciprocating cleaning system. The suction nozzles move axially back and forth along the screen filter surface, enabled by the bi-directional screw mechanism, allowing continuous cleaning coverage while balancing forces through controlled motion.
2Extent of automation
If an internal hydraulic turbine is used for rotation, then automation is improved, but operation at changeable rotation direction becomes difficult
Solution Approach 1:
The patent applies periodic action by using an internal hydraulic turbine that receives periodic pulses of pressurized water from the flush valve. Each water pulse rotates the turbine and connected screw mechanism in a single direction, creating periodic rotational cycles that drive the reciprocating cleaning motion without requiring bidirectional control.
Solution Approach 2:
The patent inverts the conventional approach by using single-direction turbine rotation combined with a bi-directional screw mechanism to achieve bidirectional nozzle movement. Instead of controlling turbine rotation direction, the system maintains constant rotation direction and uses the screw geometry to convert it into reciprocating axial motion for cleaning both directions of the screen.
3Ease of operation
If a bi-directional screw is used for axial movement, then axial movement switching is achieved, but the screw complexity increases
Solution Approach 1:
The patent applies universality by designing the bi-directional screw mechanism to perform multiple functions: it converts single-direction rotational motion into bi-directional axial movement, provides force multiplication, and enables reciprocating cleaning strokes. The same screw structure handles both forward and reverse cleaning motions without requiring separate mechanisms.
Solution Approach 2:
The bi-directional screw mechanism is self-regulating, automatically switching axial movement direction based on its mechanical geometry and the rotational input from the turbine. The screw thread design inherently provides the bidirectional capability without requiring external control systems or complex actuation 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
The balanced cleaning system effectively counteracts axial forces, reducing friction and wear, and enhancing the reliability and efficiency of the filter's cleaning mechanism by maintaining similar pressure exposure at both ends of the core, thus improving the overall cleaning process.
Implementation Method 1
Pressure differences between filter inlet pressure (P) and atmospheric pressure creates suction forces at the nozzle tips
Implementation Method 2
Internally operated shaft, where the driving force is the flushing water going through the turbine curved channels
Data Source
AI summary
A filter arrangement includes a cleaning mechanism for cleaning at least one screen filter of the filter arrangement. The cleaning mechanism has a flush chamber, a central hollow core that extends through the flush chamber, and suction nozzles fitted to the core. The core extends between opposing axial ends that are located outside of the flush chamber in exposure to substantially similar pressures at least during a cleaning operation of the cleaning mechanism.