Conical Refiner Blade Bars for Uniform Pulp Quality
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Solution Overview
Problem
Existing refiners with V-shaped blade bars and grooves suffer from uneven pulp quality due to asymmetric material flow, leading to reduced loading capacity and inefficient energy utilization, as they promote rotor rotation in one direction only.
Innovation Solution
The refiner design features a conical portion with retentive blade bars in the outer zone, arranged at a negative angle relative to the rotor's rotation direction, which slows down material flow and increases residence time, enhancing pulp quality and uniformity by preventing material from moving out of the blade gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If V-shaped blade bars and grooves are used in the refining surface, then the rotor can rotate in both directions, but the pulp quality becomes uneven and loading capacity decreases
Solution Approach 1:
The patent applies asymmetry by using blade bars with different angles in different zones of the refining surface. The inner zone has blade bars angled to feed material toward the center, while the outer zone has blade bars angled to retain material, creating asymmetric flow patterns that improve pulp quality uniformity while maintaining bidirectional rotation capability
Solution Approach 2:
The patent divides the refining surface into different zones (inner zone and outer zone) with locally optimized blade bar configurations. Each zone has blade bars arranged at specific angles suited to its function: the inner zone focuses on material feeding while the outer zone focuses on material retention, achieving local quality optimization that resolves the pulp quality uniformity issue
2Ease of operation
If V-shaped blade bars are used to allow bidirectional rotation, then operational flexibility improves, but loading capacity and energy utilization efficiency decrease
Solution Approach 1:
The patent implements local quality by configuring blade bars with zone-specific angles: the inner zone blade bars are arranged to efficiently feed material toward the center for high loading capacity, while the outer zone blade bars are arranged to retain material for improved energy utilization. This local optimization allows the refiner to maintain high productivity while supporting bidirectional rotation for operational flexibility
3Speed
If blade bars are arranged to feed material out of the blade gap, then material flow speed increases, but residence time decreases and pulp quality uniformity worsens
Solution Approach 1:
The patent applies local quality by creating different flow conditions in different zones: the inner zone blade bars are arranged to feed material toward the center at controlled speeds, while the outer zone blade bars are arranged at angles that create retentive effects, slowing material flow and increasing residence time. This zoned approach ensures uniform pulp quality while maintaining efficient overall material throughput
Solution Approach 2:
The patent applies inversion by having the outer zone blade bars arranged opposite to the typical feeding direction, creating a retentive effect that pushes material back toward the center rather than allowing it to exit. This inverted arrangement in the outer zone balances the feeding action in the inner zone, improving pulp quality uniformity while maintaining appropriate material flow speeds
Data Source
Figure 1~4
Figure 2
Figure 3
AI summary
A refiner (1 ) comprising a stator (2) and a rotor (4). The stator (2) and the rotor (4) comprise a flat portion (7, 9) and a conical portion (8, 10). The conical portion has a first end (17) of smaller diameter (D1) and a second end (18) of greater diameter (D2) such that the first end is directed towards the flat portion and the second end is directed away from the flat portion. The refining surface (12) of the conical portion of the stator comprises at least an outer zone (23) arranged at the second end of the conical portion and an inner zone (22) arranged relative to the outer zone on the side of the first end of the conical portion. A portion of the length of the blade bars (20) in the outer zone are arranged relative to the rotation direction (RD) of the rotor such that they have a retentive effect on the material to be refined. Also a blade segment (19) for a conical portion of a stator of a refiner.