Defibrating Chamber Screen Layout for Uniform Fiber Defibration
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Solution Overview
Problem
The defibrating apparatus in existing technologies experiences varying degrees of defibration due to increased pressure differences between downstream and upstream discharge paths, leading to inconsistent air flow velocities through the through-holes and affecting the defibration process.
Innovation Solution
The apparatus incorporates a screen with strategically distributed through-holes and a closing member to control the communication between the defibrating chamber and discharge path, reducing the pressure difference and ensuring consistent air flow velocities, thereby stabilizing the defibration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the discharge path is designed with uniform through-holes throughout, then the structure is simple and easy to manufacture, but the pressure difference and velocity difference between downstream and upstream regions increase, causing variable defibration degree
Solution Approach 1:
The patent applies local quality by varying the number of through-holes in different regions of the annular wall. Specifically, the downstream annular wall has fewer through-holes per unit area compared to the upstream annular wall. This non-uniform distribution localizes the through-hole density to match the pressure gradient requirements at different positions, thereby reducing velocity differences and ensuring consistent defibration degree throughout the discharge path.
2Productivity
If the number of through-holes is increased in the downstream region, then air flow is enhanced for better defibration, but pressure difference increases causing excessive defibration and product loss
Solution Approach 1:
The patent applies parameter changes by modifying the through-hole density parameter across different regions of the annular wall. The downstream annular wall is designed with a lower number of through-holes per unit area compared to the upstream region. This parameter variation optimizes air flow distribution according to the pressure gradient, preventing excessive defibration in the downstream region while maintaining adequate defibration efficiency in the upstream region.
3Device complexity
If uniform through-hole distribution is used, then device complexity is low, but velocity difference between upstream and downstream air flow increases, leading to inconsistent defibration
Solution Approach 1:
The patent implements local quality by creating non-uniform through-hole distribution in the annular wall. The downstream annular wall has fewer through-holes per unit area than the upstream annular wall. This localized variation in through-hole density is designed to compensate for the pressure gradient along the discharge path, thereby reducing velocity differences and ensuring uniform defibration degree while maintaining reasonable device complexity.
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 configuration maintains consistent defibration quality by minimizing velocity differences across the screen, ensuring uniform defibration of the material and improving the efficiency of the defibration process.
Implementation Method 1
a rotor that rotates around an axis center of a rotation shaft as a rotation center, a defibrating chamber that accommodates the rotor and in which a defibrated product is formed from a material containing a fiber by rotation of the rotor
Implementation Method 2
the discharge pipe that discharges the defibrated product from the discharge path by negative pressure being applied, the defibrated product formed in the defibrating chamber is discharged to the discharge path through the through-holes by an air flow generated by a pressure difference between the pressure in the defibrating chamber and the pressure in the discharge path
Data Source
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AI summary
In a defibrating apparatus, when a region, of a discharge path, including a discharge unit is a downstream discharge path, a region, of the discharge path, other than the downstream discharge path is an upstream discharge path, a region, of a screen, constituting the downstream discharge path is a downstream discharge screen, a region, of the screen, constituting the upstream discharge path is an upstream discharge screen, and a through-hole that causes a defibrating chamber to be in communication with the discharge path is a communication hole, the communication hole is provided on the screen such that the air is less likely to pass through the downstream screen than the upstream screen.