Vacuum Cleaner Separator Layout for Suction and Impeller Protection
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Solution Overview
Problem
Vacuum cleaners face a challenge in maintaining suction power due to pressure drops across dirt-separation stages, which can be addressed by optimizing the location and configuration of these stages relative to the vacuum motor, while also considering the need to remove coarse dirt and reduce power consumption.
Innovation Solution
A vacuum cleaner design with a dirt separator that includes a first dirt-separation stage upstream of the impeller and a second stage downstream, utilizing a centrifugal impeller and cyclonic separators arranged around the motor to enhance air flow and separation efficiency, with channels minimizing flow losses and allowing for air to cool the motor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both dirt-separation stages are located upstream of the impeller, then coarse dirt can be removed before the impeller, but the suction power at the inlet is significantly reduced due to pressure drops
Solution Approach 1:
The dirt separation process is divided into two distinct stages: a first cyclonic separator upstream of the impeller to remove coarse dirt, and a second cyclonic separator downstream of the impeller to remove fine dirt. This segmentation allows the impeller to be protected from coarse dirt while maintaining high suction power, as the second separation stage does not create pressure drops that would reduce inlet suction.
2Power
If a more powerful vacuum motor is employed to increase suction power at the inlet, then the suction power is improved, but the cost, size, weight and power consumption increase
Solution Approach 1:
The pressure drop that normally occurs across dirt-separation stages is converted into a benefit by placing the second cyclonic separator downstream of the impeller. The impeller generates high pressure that drives air through the second separator, and the separated air is then reused for motor cooling. This converts what would be a harmful pressure loss into a useful cooling flow, allowing the use of a smaller, more energy-efficient motor.
3Manufacturing precision
If the second dirt-separation stage is located downstream of the impeller, then the air pressure at the impeller inlet is higher and separation efficiency is improved, but the device complexity increases
Solution Approach 1:
The air flow path is designed to serve multiple functions: it drives the second cyclonic separator downstream of the impeller for fine dirt removal, then the separated air is routed through the motor housing to cool the motor, and finally discharged. This multi-functionality reduces the need for separate cooling systems and simplifies the overall device complexity while maintaining high separation efficiency.
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 increases suction power, improves separation efficiency, and reduces power consumption by maintaining higher air pressure at the impeller inlet and minimizing flow losses, while allowing for efficient dirt collection and motor cooling.
Implementation Method 1
The first dirt-separation stage may comprise a single cyclonic separator, and second dirt-separation stage may comprise a plurality of cyclonic separators
Implementation Method 2
a vacuum motor for moving air through the first dirt-separation stage and the second dirt-separation stage, the vacuum motor comprises an impeller driven by an electric motor
Implementation Method 3
the air pressure at the inlet of the impeller is higher in comparison to a scheme in which both dirt-separation stages are located upstream of the impeller. Since the air pressure at the impeller inlet is higher, the impeller imparts a greater pressure rise to the air
Implementation Method 4
allowing for air to cool the motor components
Data Source
AI summary
A vacuum cleaner having a main body and a dirt separator that is removably attached to the main body. The dirt separator includes a first dirt-separation stage, a second dirt-separation stage, and a vacuum motor for moving air through the first dirt-separation stage and the second dirt-separation stage. The vacuum motor has an impeller driven by an electric motor. The first dirt-separation stage is then located upstream of the impeller, and the second dirt-separation stage is located downstream of the impeller.