Vacuum Cleaner Suction Power Control Under Dust Bag Load
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vacuum cleaners face challenges in maintaining constant suction power across varying operating conditions, particularly when the dust bag is full or empty, leading to inefficient energy use and suction power fluctuations.
Innovation Solution
A vacuum cleaner with a control unit that adjusts the input power to the drive unit based on real-time feedback from two sensors, ensuring the suction power at the vacuum attachment remains constant by compensating for pressure drops and flow rate changes, allowing user-defined suction power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high input power is selected for the drive unit to maintain sufficient suction power when the dust bag is full, then suction power is maintained, but energy consumption increases excessively when the dust bag is empty
Solution Approach 1:
The control unit continuously monitors the actual suction power at the vacuum attachment and adjusts the input power to the drive unit in real-time to maintain a predefined suction power level. This feedback mechanism eliminates the need for high fixed input power, allowing the system to consume less energy when the dust bag is empty while maintaining reliable suction power when needed.
Solution Approach 2:
The system transitions from static input power selection to dynamic input power adjustment. The control unit continuously adapts the drive unit's input power based on actual operating conditions and measured suction power, enabling the system to optimize energy consumption while maintaining required suction power levels across different operating states.
2Device complexity
If open-loop control with fixed input power is used, then device complexity is low, but suction power varies with operating conditions
Solution Approach 1:
The control unit uses feedback from suction power measurements to adjust the input power to the drive unit, maintaining a predefined suction power level despite varying operating conditions. This feedback control ensures reliable and consistent suction power while managing device complexity through efficient control algorithms.
3Reliability
If flow rate control systems are implemented to prevent flow rate decrease when the dust bag is full, then flow rate is maintained, but the system becomes complex and difficult to control with dense floor coverings
Solution Approach 1:
Instead of complex flow rate control systems, the patent uses suction power feedback control. The control unit monitors actual suction power and adjusts input power accordingly, which inherently maintains both flow rate and suction power. This approach simplifies the control system while effectively handling dense floor coverings and full dust bags.
Solution Approach 2:
The system controls suction power as the primary parameter rather than flow rate alone. By adjusting input power based on suction power measurements, the system automatically adapts to changing operating conditions including dense floor coverings and full dust bags, maintaining reliable performance without complex control mechanisms.
Data Source
AI summary
A vacuum cleaner includes a drive unit configured to generate a suction air stream, a vacuum attachment, a separator device disposed between the vacuum attachment and the drive unit and a control unit. The control unit is configured to influence an input power to the drive unit as a manipulated variable so as to control the suction power at the vacuum attachment as the controlled variable. The suction power at the vacuum attachment is controllable at a predefined level.