Vacuum Cleaner Motor Shutoff Using Float Pressure Detection
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Solution Overview
Problem
Existing vacuum cleaners require manual intervention to prevent overfilling, which can lead to motor damage, as they continue to operate even after the collection drum reaches its maximum capacity, necessitating continuous operator monitoring.
Innovation Solution
A system that uses pressure taps and a float to detect a pressure differential within the vacuum cleaner, automatically toggling the power switch from 'on' to 'off' when the drum approaches maximum capacity, ensuring the motor is disabled without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual monitoring is used to prevent overfilling, then operator control is maintained, but continuous operator attention is required and motor damage risk increases
Solution Approach 1:
The system enables self-service operation by implementing automatic motor shutoff through a float mechanism. When the collection drum reaches maximum capacity, the float rises and automatically interrupts power to the motor without requiring operator intervention. This resolves the contradiction by making the system protect itself while eliminating the need for continuous operator monitoring.
Solution Approach 2:
The float mechanism provides continuous feedback on the liquid level in the collection drum. When the liquid reaches a predetermined level, the float rises and triggers the power interruption circuit, creating a closed-loop feedback system that automatically responds to drum capacity conditions and protects the motor accordingly.
2Productivity
If the vacuum continues to operate after maximum capacity, then productivity is maintained, but motor damage occurs
Solution Approach 1:
The system applies preliminary anti-action by preventing the harmful effect before it can occur. The float mechanism is positioned to interrupt power to the motor before the collection drum can become overfilled, thereby preemptively protecting the motor from damage while allowing the vacuum to operate at full productivity up to the safe capacity limit.
3Reliability
If automatic shutoff is implemented, then motor protection is improved, but device complexity increases
Solution Approach 1:
The patent employs simple, inexpensive components for the automatic shutoff mechanism, including a basic float element and a straightforward power interruption circuit. These simple components provide reliable automatic motor protection without introducing complex control systems, electronic sensors, or sophisticated mechanisms, thereby resolving the contradiction between reliability improvement and 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
The system effectively prevents motor damage by automatically disabling the vacuum cleaner's motor when the collection drum reaches its maximum capacity, eliminating the need for continuous operator monitoring and ensuring safe operation.
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.