Vacuum Cleaner Suction Control With Dual Pressure Feedback
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Solution Overview
Problem
Existing vacuum cleaners require manual adjustment of suction power due to filter bag clogging and varying floor types, leading to energy wastage and inconsistent cleaning performance.
Innovation Solution
A vacuum cleaner with dual pressure sensors and control circuits that maintain constant suction power at the nozzle by adjusting motor/fan unit output based on detected pressures and floor type, using a higher-level control circuit to manage two independent control loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual readjustment of suction power is performed, then suction power can be restored after filter bag clogging, but energy is wasted due to over-regulation
Solution Approach 1:
The patent implements automatic feedback control by measuring the actual suction power at the suction nozzle using a pressure sensor, comparing it with the set suction power, and automatically adjusting the motor speed through a control circuit to maintain consistent suction power without manual intervention or energy waste from over-regulation
Solution Approach 2:
The vacuum cleaner performs self-regulation of suction power through an automatic control system that monitors filter bag clogging conditions and adjusts motor speed independently, eliminating the need for manual readjustment and preventing energy waste from user over-regulation
2Productivity
If suction power is increased for soft floor coverings, then cleaning effectiveness improves, but pushing force of the suction nozzle increases significantly
Solution Approach 1:
The patent dynamically changes the suction power parameter based on detected floor type (hard or soft flooring), automatically selecting appropriate power levels to maintain cleaning effectiveness on soft floors while reducing pushing force on hard floors through electronic control of motor speed
3Device complexity
If a single pressure sensor is used for dust bag filling detection, then device complexity is reduced, but only one signal for evaluating filling level is obtained
Solution Approach 1:
The patent divides the pressure measurement function into two separate pressure sensors positioned at different locations (one for suction nozzle pressure and one for dust separation unit pressure), allowing independent evaluation of suction power and dust bag filling level without interfering with each other's measurement accuracy
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
Ensures consistent suction power at the nozzle regardless of dust separation unit filling and floor type, optimizing energy use and maintaining effective cleaning performance.
Implementation Method 1
a first pressure sensor for detecting a negative pressure generated by the motor/fan unit and present at the dust separation unit
Implementation Method 2
a second pressure sensor for detecting a negative pressure present at the suction nozzle
Implementation Method 3
the suction force generated by the vacuum cleaner is reduced as soon as the signal from the second pressure sensor approaches an upper threshold value
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a device for a vacuum cleaner (1). Said device only supplies as much electrical power to the motor/fan unit (10) as is necessary for the optimal cleaning of the floor surface to be cleaned and required by the respective operating states of the vacuum cleaner (1), thereby ensuring an energy-efficient use of the vacuum cleaner. Said device thereby ensures a constant cleaning action over the usable life of the vacuum cleaner (1). As the suction nozzle has a constant suction power, dust and dirt particles are always sucked up with a consistently applied suction power and supplied to a dust collection unit (3). The invention also protects the surfaces to be cleaned from being subjected to too much cleaning.