Cyclone Separator Margin Space Dust Separation
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Solution Overview
Problem
Existing portable working machines, such as cut-off saws, face engine performance reduction and frequent air filter maintenance due to insufficient dust particle separation, despite two-stage air purification systems.
Innovation Solution
A dust particle separation system with a cyclone separator and introduction passage design that includes a margin space and acute angle configuration, enhancing swirl flow initiation and separation efficiency while reducing airflow resistance and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-stage air purification system is used, then air purification is improved, but dust particle separation is insufficient and air filter maintenance frequency increases
Solution Approach 1:
The air purification system is divided into three distinct stages: a first volute for initial dust removal, a cyclone separator for intermediate separation, and a second volute for final purification before the air filter. This segmentation allows each component to specialize in removing particles of different sizes and densities, significantly reducing the load on the air filter and extending its maintenance cycle.
Solution Approach 2:
Each stage of the purification system is designed with specific local characteristics optimized for its function. The first volute has a specific geometry for coarse particle removal, the cyclone separator has a optimized vortex chamber for medium particles, and the second volute is configured for fine particle removal. This local optimization ensures maximum efficiency at each stage while minimizing air filter contamination.
2Loss of energy
If the introduction passage cross-sectional area is increased, then airflow resistance is reduced, but swirl flow may be hindered
Solution Approach 1:
The introduction passage is designed with a variable cross-sectional area that dynamically adapts to the airflow conditions. The passage starts with a smaller area to maintain high velocity and swirl flow generation, then gradually expands to a larger area to reduce resistance and accommodate the increased air volume after dust removal. This dynamic transition optimizes both swirl flow generation and energy efficiency.
Solution Approach 2:
The introduction passage geometry is optimized by changing key parameters including the angle of the passage relative to the cyclone separator inlet, the rate of cross-sectional area expansion, and the surface roughness. These parameter changes ensure that the passage maintains sufficient velocity for swirl flow generation while minimizing pressure losses and airflow resistance.
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 effectively separates dust particles, extending engine durability and air filter maintenance cycles without compromising engine performance and reducing the need for pre-filters.
Implementation Method 1
a cyclone separator (11) which separates dust particles contained in air transferred by the centrifugal fan (7)
Implementation Method 2
a swirl flow to occur later in the cyclone separator (11) starts at the margin space (13) provided before the cyclone separator (11)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An object of the present invention is to increase the durability of an engine by separating dust particles sufficiently with as few components as possible, and to extend the maintenance cycle of an air filter. A cyclone separator 11 having a circular cross section is arranged upstream of an air filter 18. An introduction passage 12 extends from a branch air inlet 10, which is provided at a position displaced from a main passage 9, to the cyclone separator 11. A margin space 13 where at least part of air introduced in the introduction passage 12 flows is formed in the introduction passage 12 before the cyclone separator 11. A swirl flow occurring in the cyclone separator 11 starts at this margin space 13.