Screw-Type Fine Powder Feeding Device Screen Sealing
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Solution Overview
Problem
Conventional screw-type fine powder raw material feeding devices face issues with accurate mating of circular-arc shaped screens and porous curved walls, leading to gaps and leakage of fine powder into the venting chamber.
Innovation Solution
A screen is wound around the outer periphery of a tubular receiving member with annular metal fixtures, setting a gap between the screen and the screw's outer diameter to 1 mm to 10 mm, ensuring only gas is discharged through gas vent ports, and the fine powder is prevented from leaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a screen with circular-arc shape is used to match the porous curved wall member, then the screen can cover the gas vent ports, but a gap easily appears between the screen and the porous curved wall member causing fine powder leakage
Solution Approach 1:
The patent employs a flexible screen that can be bent into a circular-arc shape to conform to the porous curved wall member. This flexible membrane approach allows the screen to adapt to the curved geometry while maintaining intimate contact, thereby preventing gaps and fine powder leakage that would occur with rigid circular-arc shaped screens.
Solution Approach 2:
The patent utilizes a curved screen surface with circular-arc geometry to match the curvature of the porous curved wall member. By designing the screen with the appropriate radius of curvature, it can closely follow the contour of the receiving member, ensuring continuous contact and effective sealing around the gas vent ports.
2Reliability
If the screen is tightly fitted to prevent leakage, then sealing performance improves, but the device complexity increases and screen replacement becomes difficult
Solution Approach 1:
The screen is designed as a separate, removable component that can be independently installed and replaced without disassembling the entire device. This segmentation allows the screen to be tightly fitted for sealing while maintaining ease of maintenance, as the screen can be accessed and replaced by simply removing it from the receiving member.
Solution Approach 2:
The screen is designed with dynamic characteristics that allow it to be easily installed and removed. The flexible nature of the screen enables it to be slipped over the receiving member during installation and removed when needed for replacement, providing both tight sealing and operational flexibility without increasing device complexity.
3Reliability
If a gap is set between the screen and the screw, then fine powder leakage is prevented, but the gap must be precisely controlled within 1 mm to 10 mm range
Solution Approach 1:
The patent establishes a specific gap range (1 mm to 10 mm) between the screen and the screw as an optimal parameter. By controlling the screen position and dimensions to maintain this gap, the design prevents fine powder leakage while avoiding the need for extremely tight tolerances, thus balancing reliability with manufacturing feasibility.
Data Source
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AI summary
The object of the invention is to fix a screen, which is wound on the outer periphery of a tubular receiving member having gas vent ports, with annular metal fixtures and prevent a fine powder raw material from leaking to the outside. The screw-type fine powder raw material feeding device in accordance with the present invention includes a screen (5) wound on the outer periphery of a tubular receiving member (21) and a plurality of annular metal fixtures (23) for bringing the screen (5) into close contact with the tubular receiving member (21) side. A gap (D) between the screen (5) and an outer diameter of a screw (2) is set to 1 mm to 10 mm, only a gas separated from the fine powder raw material is discharged to the outside from the gas vent ports (20), and the fine powder raw material is fed into a cylinder (1a), with no fine powder raw material being leaked to the outside from the screen (5). The invention also relates to a method using the device.