Vacuum Cleaner Float Shutoff for Overfill Motor Protection
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Solution Overview
Problem
Existing vacuum cleaners lack an automatic mechanism to prevent motor damage from overfilling, requiring manual intervention to shut off the power supply when the collection drum reaches its maximum capacity, which can lead to accidental continued operation and potential damage.
Innovation Solution
The system includes pressure taps to detect a pressure differential within the vacuum cleaner, a float that adjusts with liquid levels, and a power switch that toggles based on this differential, automatically disabling the motor when the drum approaches maximum capacity, eliminating the need for manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a float mechanism is used to detect liquid level, then the vacuum cleaner can detect when the drum is full, but the motor continues to operate requiring manual intervention to shut off
Solution Approach 1:
The system automatically shuts off the motor when the float detects maximum liquid level, eliminating the need for manual intervention. The power switch is mechanically coupled to the float mechanism, creating a self-service system that autonomously protects the motor from damage.
Solution Approach 2:
The float provides continuous feedback on liquid level to the power switch mechanism. When the float rises to indicate maximum capacity, it triggers the power switch to open the circuit, creating a closed-loop feedback system that automatically responds to drum fill status.
2Device complexity
If the vacuum cleaner lacks an automatic shutdown mechanism, then the device complexity is reduced, but the motor is vulnerable to damage from overfilling
Solution Approach 1:
The float mechanism and power switch are merged into a single integrated assembly where the float's movement directly actuates the power switch. This combination provides motor protection without adding significant complexity, as the two functions are unified rather than separate systems.
Solution Approach 2:
The float acts as an intermediary between the liquid level detection and the power switch activation. It translates the physical state of the drum fill level into mechanical motion that opens or closes the electrical circuit, providing a simple yet effective mediation mechanism.
3Device complexity
If manual monitoring is required to prevent overfilling, then the device complexity is minimized, but the risk of accidental continued operation increases
Solution Approach 1:
The system performs self-protection by automatically shutting off power when the float detects maximum liquid level. This eliminates reliance on operator attention and prevents accidental motor damage, making the system self-protecting without complex controls.
Solution Approach 2:
The power switch mechanism is pre-configured to automatically open the circuit when the float reaches the maximum level position. This preliminary anti-action prevents motor damage before it can occur, rather than requiring corrective action after damage begins.
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 solution ensures the vacuum cleaner automatically shuts off the motor when the collection drum is full, preventing damage and reducing the risk of accidental overfilling, enhancing operational safety and efficiency.
Implementation Method 1
a float adapted to change its position as a function of an amount of liquid stored in a vacuum cleaner
Implementation Method 2
at least two pressure taps adapted to detect a pressure differential between a first and second portion of the inlet plenum
Data Source
AI summary
Applicant has created systems, methods, and apparatuses for controlling the power supply of a vacuum cleaner motor. The systems and apparatuses include pressure taps to detect a pressure differential within a vacuum cleaner, a float that adjusts depending on an amount of liquid stored, and a power switch that toggles based on the pressure differential created by the position of the float. Alternatively, the float can be replaced by an air chamber so that the pressure differential is created by liquid rising above the volume of air trapped in the chamber. The method can include interrupting the current supplied to an electrical circuit of a power switch based upon a pressure differential created within the vacuum. By controlling the power supply to a vacuum cleaner motor based on a pressure differential created by the amount of liquid stored within the vacuum cleaner, the vacuum cleaner can automatically disable the vacuum cleaner's motor as the vacuum approaches its maximum liquid capacity.