Refiner Blade Segment Geometry for Stable Flow and Low Vibration
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Solution Overview
Problem
Existing refiners for fibrous materials experience flow variations and vibrations due to inconsistent angles of incidence between rotor and stator openings, leading to inefficiencies in the refining process.
Innovation Solution
The blade segments are designed with side edges that deviate from the longitudinal axis, creating slit-like openings with varying angles of incidence, which stabilize the flow path and reduce vibrations by aligning the point of incidence away from the axial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blade segment side edges are configured parallel to the longitudinal axis, then the structure is simple and easy to manufacture, but flow variations and vibrations occur due to inconsistent angles of incidence between rotor and stator openings
Solution Approach 1:
The blade segment side edges are configured with asymmetric angles relative to the longitudinal axis. The first side edge forms a first angle and the second side edge forms a second angle, creating slit-like openings with varying angles of incidence. This asymmetric configuration stabilizes the flow path and reduces vibrations by ensuring consistent angular relationships between rotor and stator openings throughout the refining chamber.
2Productivity
If the slit-like openings are aligned axially, then the flow path is direct, but flow pulse variations and vibrations increase due to inconsistent angles of incidence
Solution Approach 1:
The angles of the blade segment side edges are specifically designed to create slit-like openings with optimized angles of incidence. By changing the angular parameters of the openings rather than using simple axial alignment, the flow path becomes more stable and consistent, reducing flow pulse variations and vibrations while maintaining efficient material flow through the refining chamber.
Data Source
Figure 1
Figure 2~3
Figure 4a~4b
AI summary
A blade segment (4, 8) for a refiner (1) for refining fibrous material. The blade segment (4, 8) comprises a first (20) and a second (21) end edge opposite to the first end edge in a direction of a longitudinal axis(LA) of the blade segment (4, 4a, 4b, 8, 8a, 8b), a first (22) and a second (23) side edge opposite to the first side edge, the first side edge and the second side edge extending between the first end edge and the second end edge, and a refining surface (5, 9) comprising blade bars (26) and blade grooves (27) therebetween on a front surface (25) of the blade segment (4, 8). Atleast one side edge (22, 23) comprises at least two edge portions (31, 33, 35, 41, 43, 45) arranged to deviate from the direction of the longitudinal axis (LA) of the blade segment (4, 4a, 4b, 8, 8a, 8b) and being connected by an elbow (32, 34, 42, 44) between each two edge portions (31, 33, 35, 41, 43, 45).