Wavy Sheet Metal Cylinder Screen for Clogging Resistance
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Solution Overview
Problem
Conventional cylinder screens with constant flow cross-sections in the radial direction tend to clog easily due to their design, leading to operational inefficiencies.
Innovation Solution
A cylinder mold with a sheet metal strip wound into a wavy line with increasing or decreasing wave crests and troughs relative to the radial direction, creating varying screen openings that reduce clogging and allow for easy flushing, featuring a manufacturing device with counter-rotating gears to shape the metal strip into a sinusoidal or flattened waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cylinder screens with constant flow cross-section are used, then the structure is simple and manufacturing is easy, but the screen openings become clogged easily during operation
Solution Approach 1:
The patent applies local quality by varying the screen opening size along the flow direction. The screen openings are designed to be smaller at the inlet and progressively larger at the outlet, creating different local characteristics within the same screen structure. This gradient design prevents clogging by reducing the tendency for particles to accumulate in uniform-sized openings, while maintaining manufacturing simplicity through a systematic geometric progression.
Solution Approach 2:
The patent implements parameter changes by systematically varying the screen opening dimensions along the radial flow direction. The opening size parameter changes continuously or in steps from inlet to outlet, transforming the constant parameter design into a variable parameter design. This parameter variation resolves the clogging issue while the systematic nature of the change keeps the manufacturing process relatively simple.
2Ease of repair
If screen openings with constant cross-section are used, then manufacturing is inexpensive, but flushing operations become difficult when clogging occurs
Solution Approach 1:
The patent applies local quality by creating different opening sizes at different locations along the flow path. The larger openings at the outlet provide easy access for flushing operations and particle removal, while the smaller inlet openings maintain effective filtration. This localized variation in opening size makes flushing operations significantly easier compared to uniform screens, while the systematic design keeps manufacturing costs reasonable.
3Reliability
If the height of wave crests and troughs increases radially outwards, then screen openings increase in size radially outwards reducing clogging, but the basic body shape becomes more complex
Solution Approach 1:
The patent applies curvature by forming the sheet metal strip into a wavy configuration with sinusoidal or similar curved profiles. The wave crests and troughs create the variable screen openings, and the continuous curved nature of the waveform allows for smooth transitions in opening size. This curved geometric approach achieves the desired variable opening pattern while maintaining a relatively simple overall cylindrical or frustoconical base body shape.
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 design significantly reduces clogging and enhances sieving efficiency by varying the size of screen openings radially, making the cylinder screen suitable for both inward and outward flow directions with adjustable screen opening ratios.
Implementation Method 1
at least one pair of counter-rotating gear wheels, which are arranged and configured above and below the sheet metal strip to be passed through in such a way that the sheet metal strip is deformed into a wave shape with wave crests and wave troughs as it passes through
Implementation Method 2
at least two rounding rollers, which are arranged and designed next to the continuous sheet metal strip in such a way that the sheet metal strip is wound up to form a large number of sheet metal strip turns
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3(a)~3(c)
AI summary
A circular screen according to the invention comprises a substantially cylindrical and/or truncated cone-shaped main part which is made of a sheet metal strip wound into a plurality of sheet metal strip coils (4). The sheet metal strip describes a wavy line which oscillates about a reference plane and has wave peaks (6) and wave valleys (10). Adjacent sheet metal strip coils (4) lie against one another such that screen openings (11) are formed in the radial direction, and the height of the wave peaks (6) and the wave valleys (10) of the sheet metal strip coils (4) increases outwards in the radial direction with respect to the reference plane such that the size of the screen openings (11) increases radially outwards in the flow direction, or the height of the wave peaks (6) and the wave valleys (10) of the sheet metal strip coils (4) increases inwards in the radial direction with respect to the reference plane such that the size of the screen openings (11) increases radially inwards in the flow direction.