Hand Vacuum Cleaner Air Flow Path Alignment to Reduce Back Pressure
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Solution Overview
Problem
In surface cleaning apparatuses, particularly hand vacuum cleaners, the increase in air flow path length and changes in air flow direction lead to increased back pressure and reduced air flow velocity at the dirty air inlet, resulting in decreased cleaning efficiency, especially when these devices are designed to be portable and lack high-power suction motors.
Innovation Solution
The design aligns the nozzle portion, air treatment member assembly, and suction motor to shorten and straighten the air flow path, with the air treatment member assembly being removable and seated on the main body or handle assembly for stability, reducing movement and wear between components, and incorporating a pistol grip handle for ergonomic handling and improved maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air flow path is lengthened or air flow direction is changed to accommodate portable design, then the device can be made more portable and maneuverable, but back pressure increases and air flow velocity at the dirty air inlet is reduced
Solution Approach 1:
The air treatment member assembly is divided into a separate removable module that can be detached from the main body. This segmentation allows the air flow path to be optimized for performance while maintaining portable design, as the removable assembly can be easily cleaned and replaced without affecting the overall air flow path length in the main body.
Solution Approach 2:
The air treatment member assembly is designed to be dynamically removable and reattachable, allowing the system to adapt between different operational states. When attached, it provides complete air treatment functionality; when removed, it allows for easy cleaning and maintenance, thereby maintaining both portability and cleaning efficiency.
2Ease of repair
If the air treatment member assembly is made removable for cleaning and maintenance, then ease of maintenance is improved, but stability and movement reduction between components is worsened
Solution Approach 1:
The air treatment member assembly is pre-configured with specific attachment features that ensure stable connection to the main body during operation. The assembly includes protrusions that fit into corresponding recesses, and sealing elements are pre-positioned to ensure proper sealing before attachment, thereby maintaining stability while allowing easy removal for maintenance.
Solution Approach 2:
Sealing elements act as intermediaries between the air treatment member assembly and the main body. These seals ensure airtight connection when the assembly is attached, maintaining stability and preventing air leaks, while still allowing the assembly to be easily removed and reattached for maintenance purposes.
3Productivity
If the nozzle portion is positioned forward of the air treatment member assembly to shorten air flow path, then air flow efficiency is improved, but device complexity increases
Solution Approach 1:
The nozzle portion and air treatment member assembly are merged into a integrated forward-mounted unit. This merging eliminates the need for separate positioning mechanisms and reduces structural complexity while maintaining the shortened air flow path configuration, thereby improving air flow efficiency without significantly increasing 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 enhances the performance of the surface cleaning apparatus by maintaining air flow efficiency, reducing wear on components, and improving handling and maneuverability, leading to more effective cleaning operations.
Implementation Method 1
a suction motor, the suction motor provided in the air flow passage
Implementation Method 2
an air treatment member assembly comprising an air treatment member
Data Source
AI summary
A hand vacuum cleaner has a main body housing a suction motor, an air treatment member having a front end and a rear end with a central longitudinal axis extending between the front and rear ends and a bleed valve having a bleed air flow path that extends from a bleed air inlet to a bleed air outlet. The hand vacuum cleaner has right and left laterally opposed sides that are spaced apart in a direction transverse to the central longitudinal axis, and the bleed air inlet and the bleed air outlet are transversely spaced apart.