Solenoid Backspill Stop for PAP Device Motor Protection
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Solution Overview
Problem
PAP devices face the issue of backspill, where water from the humidifier can leak into the fan or blower motor during transportation, leading to potential short circuits or device damage, as the existing designs do not effectively seal the air passageway when the device is turned off.
Innovation Solution
A solenoid-based backspill prevention apparatus is integrated into the PAP device, using a magnetic field to control a backspill stop that blocks the air passageway when the device is turned off, preventing water from reaching the motor by sealing it with magnetically attractable material, and opening it when the device is powered to allow air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air passageway remains open for normal operation, then air flow is maintained, but water can backspill into the motor during transportation
Solution Approach 1:
The backspill stop is designed as a movable component that dynamically changes position between open and closed states. During normal operation, it remains open to allow air flow. During transportation, it closes to prevent water backspill into the motor, thus adapting to different operational requirements.
Solution Approach 2:
The system uses the device's own power source to automatically actuate the backspill stop via the solenoid mechanism. When the device is turned off, the solenoid de-energizes and allows the backspill stop to close automatically, providing self-protection without requiring external intervention.
2Reliability
If a backspill prevention mechanism is added, then motor protection is improved, but device complexity increases
Solution Approach 1:
The backspill prevention functionality is integrated into the existing air passageway structure of the PAP device. The backspill stop is positioned within the existing housing and air flow path, merging the protection function with the structural design rather than adding a separate external system.
Solution Approach 2:
The backspill stop acts as an intermediary component within the air passageway that selectively blocks water flow while allowing air flow during normal operation. This intermediary element provides protection without requiring complete structural redesign of the device.
3Reliability
If the backspill stop is held closed by magnets, then sealing effectiveness is improved, but energy consumption increases when open
Solution Approach 1:
The solenoid operates periodically rather than continuously - it is energized only during brief transitions when the device state changes (from on to off or vice versa). During normal operation, the solenoid remains de-energized and the backspill stop maintains its position using magnetic forces or spring pressure, minimizing energy consumption.
Solution Approach 2:
The magnetic forces provide a counterbalancing force that holds the backspill stop in the closed position without requiring continuous energy input. The magnets create a magnetic field that counteracts the force trying to open the stop, allowing stable positioning with minimal or no power consumption.
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 solution effectively prevents backspill, ensuring the PAP device remains functional and reducing the risk of costly repairs by maintaining the integrity of the motor and electronics during transportation and use.
Implementation Method 1
a first magnet is housed within a chamber and has a magnetic field oriented substantially towards a hollow center thereof and an outer edge thereof
Implementation Method 2
When the solenoid is activated, it interacts with the radial magnetic field of the first magnet to pull the backspill stop away from the opening
Implementation Method 3
One or more second magnets are also provided to the housing, having magnetic fields directed towards the backspill stop. The second magnets are situated generally near the outside of an opening in the housing, and the magnets function to hold the backspill stop in place against the housing, blocking the opening
Data Source
AI summary
A backspill prevention apparatus prevents water from a humidifier portion of a positive airway pressure (PAP) device from reaching a blower motor of a PAP device. The backspill prevention apparatus can include a variety of different devices, and is placed somewhere along an air passageway between a blower motor and a humidifier portion of a PAP device.