Undulated Rotor Element for Screening Apparatus
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Solution Overview
Problem
Prior art rotors in the pulp and paper industry are inefficient in creating three-dimensional fluid activity and often require high rotational speeds, leading to increased power consumption and ineffective blockage removal.
Innovation Solution
The rotor element features undulated leading edges that induce preliminary three-dimensional activity to weaken blockages, followed by a stronger backflushing pulse, allowing for slower rotational speeds and improved energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art rotors are used to create turbulence and pressure pulses, then blockage removal function is provided, but rotational speed must be high leading to increased power consumption
Solution Approach 1:
The undulated leading edge creates preliminary three-dimensional fluid activity that weakens blockages before the main backflushing pulse arrives, allowing the rotor to operate at lower speeds while maintaining effective blockage removal
Solution Approach 2:
The undulations on the leading edge generate three-dimensional fluid activity instead of traditional two-dimensional flow patterns, creating more effective turbulence and pressure pulses that loosen blockages with less rotational energy
2Reliability
If high rotational speeds are used to maintain screen surface cleanliness, then blockage prevention is achieved, but energy efficiency deteriorates
Solution Approach 1:
The undulated leading edge performs preliminary cleaning action by creating three-dimensional fluid activity that prevents blockage formation, allowing the rotor to run at lower speeds and reduce energy loss
3Device complexity
If traditional rotor designs are used, then simple structure is maintained, but three-dimensional fluid activity is insufficient
Solution Approach 1:
The undulated leading edge introduces curved, wave-like geometry to the rotor element, generating three-dimensional fluid activity and turbulence that enhances blockage removal while maintaining a relatively simple overall rotor structure
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 enhances screen capacity and reliability while reducing power consumption by effectively loosening and removing blockages with a combination of three-dimensional activity and pulsing action.
Implementation Method 1
The leading edge of the rotor element is undulated, whereby the leading surface is provided with undulations
Implementation Method 2
The purpose of the rotor is to create turbulence, and positive and negative pressure pulses in the fiber suspension to be screened
Data Source
AI summary
The present invention relates to a turbulence element for use with a rotor and a rotor featuring turbulence elements. The rotor is used in a screening apparatus of the pulp and paper industry. The turbulence element has a longitudinal centerline (CL); two longitudinal edges, a leading edge and a trailing edge; two opposite ends, a first end and a second end; and two surfaces, a top surface and a bottom surface arranged between the leading edge and the trailing edge. The top surface is divided into a leading surface having its origin at the leading edge, and a trailing surface having its origin at the trailing edge. The leading edge and the leading surface are provided with undulations (U).