Dual-Gap Rotor Refining for Raw Material Entry and Defibration
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Solution Overview
Problem
The turbo type fine crusher described in JP-A-11-276916 has a narrow gap between the rotor and the liner, leading to issues where the raw material may not enter and remain, resulting in inadequate pulverization.
Innovation Solution
A refining device with a casing, rotor, and liner configuration where the first rotor portion and second rotor portion have distinct blade configurations, with D1 > D2, ensuring the raw material passes through and is refined between the liner and the outer peripheral sides of the blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gap between the rotor and liner is narrowed to improve pulverization efficiency, then the pulverization effect is enhanced, but the raw material cannot enter the gap and remains in front of the rotor, reducing refining effectiveness
Solution Approach 1:
The invention applies different gap configurations at different locations: a first gap between the first rotor portion and liner, and a second gap between the second rotor portion and liner. The first gap is configured to be larger than the second gap, allowing raw material to enter effectively while maintaining high pulverization efficiency in the second gap region.
Solution Approach 2:
The rotor is divided into two distinct portions: a first rotor portion with a larger gap for material intake and a second rotor portion with a smaller gap for intensive pulverization. This segmentation allows each portion to perform its specific function optimally without interfering with the other.
2Manufacturing precision
If the gap between rotor and liner is made narrow to improve refining, then pulverization is enhanced, but raw material remains in front of rotor and cannot be satisfactorily pulverized
Solution Approach 1:
Different gap sizes are provided at different rotor locations to fulfill different functional requirements: the first gap facilitates smooth material flow and entry, while the second gap provides intensive refining action, thus achieving both good material flow and high refining quality.
Solution Approach 2:
The rotor is segmented into first and second portions with differently sized gaps, allowing the system to handle both material intake and intensive refining operations simultaneously with optimized performance for each function.
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
Ensures effective defibration of the raw material, preventing it from remaining and facilitating smooth discharge, thereby improving the pulverization process.
Implementation Method 1
the raw material charged from the charging port is refined when sequentially passing between the liner and an end portion on an outer peripheral side of the first blade and between the liner and an end portion on an outer peripheral side of the second blade
Data Source
AI summary
There is provided a refining device in which a first rotor portion has a plurality of first blades radially installed around a rotation shaft, a second rotor portion has a plurality of second blades radially installed around the rotation shaft, in a state where a rotor is rotating, a raw material charged from a charging port is refined when sequentially passing between a liner and an end portion on an outer peripheral side of the first blade and between the liner and an end portion on an outer peripheral side of the second blade, and is discharged from the discharge port, and D1>D2, where a separation distance between the liner and the end portion on the outer peripheral side of the first blade is D1, and a separation distance between the liner and the end portion on the outer peripheral side of the second blade is D2.