Integral Vacuum Fan Housing with Cylindrical Filter
Solution Overview
Problem
Mobile surface maintenance machines, such as vacuum sweepers and rotary broom sweepers, generate dust during operation, which is not effectively controlled by existing systems, leading to dust being stirred up and released into the atmosphere.
Innovation Solution
A filtration system utilizing a filter housing that defines a vacuum fan housing, incorporating cylindrical filters and a shaker mechanism to efficiently draw air through filters, with selective communication between the filter box and debris hopper to manage dust and debris, ensuring dust-free air discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If traditional exhaust blowers are used to pull air from the tool chamber, then dust can be removed from the chamber, but dust is not effectively controlled and is released into the atmosphere
Solution Approach 1:
The patent extracts the harmful dust particles from the air stream by introducing a filter housing with filters that capture dust before the air is discharged to the atmosphere. This separates the dust removal function from the simple exhaust function, ensuring dust-free discharge while maintaining effective dust control.
Solution Approach 2:
The filter housing acts as an intermediary component between the exhaust blower and the atmosphere. It mediates the air flow by allowing clean air to pass through while trapping dust particles, thus resolving the contradiction between effective dust control and preventing atmospheric release.
2Object-generated harmful factors
If filters are added to the air path to remove dust, then dust-free discharge is achieved, but the system complexity increases
Solution Approach 1:
The patent merges the filter housing with the exhaust system structure, integrating the filtration function into the existing air path. The filter housing is positioned to receive air directly from the exhaust blower and discharge it to the atmosphere, combining multiple functions (filtration, exhaust, and atmospheric discharge) into a unified system that reduces overall complexity.
Solution Approach 2:
The filter housing serves multiple functions: it houses the filters for dust removal, structures the air flow path, and provides a discharge outlet to the atmosphere. This multi-functionality reduces the need for separate components, thereby reducing system complexity while achieving dust-free discharge.
3Device complexity
If the filter box is integrated with the debris hopper, then the structure is compact, but the debris hopper cannot be lifted away during dumping procedures
Solution Approach 1:
The patent segments the filter box and debris hopper as separate, independent components. The filter box is positioned adjacent to the debris hopper but is not structurally integrated with it. This segmentation allows the debris hopper to be lifted away during dumping procedures while the filter box remains in place, resolving the contradiction between structural compactness and operational flexibility.
4Productivity
If high-speed impellers are used in the vacuum system, then air can be drawn through filters efficiently, but noise levels increase and operational costs rise
Solution Approach 1:
The patent changes the operational parameters of the impeller by using a closed-face design that allows for lower rotational speeds. The closed-face geometry improves air flow efficiency at reduced speeds, thereby maintaining productivity while significantly reducing noise levels and operational costs associated with high-speed operation.
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
The system effectively captures dust and debris, reducing dust escape and maintaining a clean air discharge, while also reducing noise and operational costs through the use of a low-speed, closed-face impeller and integrated plastic filter housing.
Implementation Method 1
an impeller drawn air through the filter(s)
Implementation Method 2
A shaker mechanism is provided to dislodge dust and debris from the filter
Implementation Method 3
one or more flaps which respond to pressure variations across the flap in order to open or close the flap
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A filter box for a surface maintenance machine incorporating aspects of a fan housing. In one example, a filter box for a sweeping machine is provided with an impeller fan housing beneath a cylindrical filter. Operation of the impeller fan draws air from a debris hopper, through the cylindrical filter, and through an expansion chamber defined by a scroll conduit prior to outlet to atmosphere.