Refiner Blade Segment With Zigzag Edges for Stable Flow
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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, featuring a zigzag shape with elbows and bends, creating slit-like openings that adjust the angle of incidence between rotor and stator, stabilizing the flow and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional blade segments with straight side edges parallel to the longitudinal axis are used, 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 side edges of the blade segment are designed with asymmetric zigzag configurations including elbows and bends, deviating from the longitudinal axis. This asymmetric geometry creates variable angles of incidence between rotor and stator openings along the axial direction, which stabilizes the flow path and reduces vibrations caused by flow variations.
Solution Approach 2:
The side edges incorporate curved elements including elbows and bends rather than straight lines. These curved features create a zigzag pattern that modifies the flow path geometry, ensuring more consistent angular relationships between rotating and stationary blade segments throughout the refining chamber.
2Object-generated harmful factors
If the side edges are configured to create slit-like openings with varying angles of incidence, then vibrations are reduced, but the manufacturing complexity increases
Solution Approach 1:
The blade segment is divided into distinct geometric zones along its length, with side edges comprising multiple straight portions and curved portions (elbows and bends). This segmentation allows each portion to be manufactured using standard techniques while the cumulative effect of all segments creates the vibration-reducing zigzag pattern.
Data Source
AI summary
A blade segment (4, 8) for a refiner (1) for refining fibrous material has first (20) and second (21) end edges opposite one another in a direction of a longitudinal axis (LA) of the blade segment (4, 4a, 4b, 8, 8a, 8b), and first (22) and second (23) side edges which extend between the first end edge and the second end edge. The blade segment has a refining surface (5, 9) with blade bars (26) and grooves (27) therebetween on a front surface (25) of the blade segment (4, 8). At least one side edge (22, 23) has 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 connected by an elbow (32, 34, 42, 44) between each two edge portions (31, 33, 35, 41, 43, 45).