Air Bladder Pump Auto Shutoff Using a Pressure Diaphragm
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Solution Overview
Problem
Existing air pumps for inflating furniture require user intervention to stop the inflation or deflation process, which can lead to motor burnout and lack of convenience, with safety measures like resettable fuses taking time to reset.
Innovation Solution
An automatic deactivation mechanism that includes a housing with apertures and a pressure-sensitive diaphragm triggering switches to de-energize the pump motor when a threshold pressure is reached, allowing for automatic shutdown during inflation or deflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump operates without an automatic deactivation mechanism, then the pump can continue running, but the motor may burn out and the user must manually monitor the inflation process
Solution Approach 1:
The pump system performs self-monitoring and self-deactivation through the pressure-sensitive diaphragm mechanism. When the air bladder reaches the desired pressure, the diaphragm automatically triggers the switch to de-energize the motor, eliminating the need for user monitoring and manual intervention while protecting the motor from burnout
Solution Approach 2:
The system incorporates a feedback mechanism where the pressure inside the air bladder is continuously monitored by the diaphragm. When the pressure reaches a predetermined threshold, the diaphragm deflects to close the electrical circuit, sending a signal to de-energize the motor and stop the inflation process
2Reliability
If a resettable fuse is used for motor protection, then the pump deactivates when overheating occurs, but it takes up to a half hour to reset the fuse
Solution Approach 1:
The system takes preliminary action by continuously monitoring pressure throughout the pump operation. Instead of waiting for overheating to occur and then resetting the fuse, the pressure-sensitive diaphragm proactively detects when the air bladder has reached the desired pressure and immediately de-energizes the motor, preventing overheating before it occurs and eliminating the need for fuse resetting
Solution Approach 2:
The system provides beforehand protection by using the pressure-sensitive diaphragm mechanism to prevent motor overheating in the first place. The diaphragm is pre-configured to trigger at a specific pressure threshold, cushioning the motor against thermal stress before it can accumulate to dangerous levels that would blow the fuse
3Ease of operation
If the user must press and hold the inflate button until inflation completes, then the pump can be controlled, but the user must attend to the inflation process continuously
Solution Approach 1:
The pump system performs self-control by automatically monitoring the inflation pressure through the diaphragm mechanism. When the air bladder reaches the predetermined pressure, the system self-deactivates by de-energizing the motor, freeing the user from the need to continuously monitor or hold the inflate button
Solution Approach 2:
The system replaces the manual mechanical control (user pressing and holding the inflate button) with an automatic pressure-sensitive diaphragm mechanism. The diaphragm mechanically responds to pressure changes and automatically triggers the electrical switch, substituting user action with an automated mechanical-electrical system
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
Enables convenient and safe automatic shutdown of the pump motor, preventing motor burnout and allowing users to walk away from the inflation or deflation process, with the pump turning off when the desired pressure is reached.
Implementation Method 1
when a threshold pressure is reached therein, at least one switch is triggered by deflection of the diaphragm
Data Source
AI summary
An automatic deactivation mechanism is configured for an air bladder pump having a casing and a motor located therein to pump air into an air bladder from the atmosphere and through an air valve connected through the casing. The automatic deactivation mechanism includes a housing positioned within the casing and has defined therethrough a first aperture in fluid communication with the atmosphere through the casing and a second aperture in fluid communication with the air bladder through the casing. Included within the housing are at least two switches and a diaphragm positioned between the switches. The housing is sealed so that when a threshold pressure is reached therein, at least one switch is triggered by deflection of the diaphragm to automatically deactivate the pump by de-energizing the motor.