Variable Output Pump Control for Inflatable Support Pressure
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Solution Overview
Problem
Person support apparatuses, such as hospital beds, face a trade-off between initial fill time and operational flow due to the competing requirements of high flow for rapid inflation and low flow for maintaining pressure, leading to inefficiencies and noise issues.
Innovation Solution
A variable output pump system with a controller that dynamically adjusts the pump's output to maintain a constant flow rate by sensing pressure changes and using pulse-width modulation, ensuring a consistent pressure gradient and reducing energy consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high flow pressurized air source is used, then the initial fill rate is improved, but the energy consumption and noise increase during normal operation
Solution Approach 1:
The pump operates dynamically by switching between two modes: high-flow mode during initial inflation to rapidly fill the structure, and low-flow mode during normal operation to maintain pressure with minimal energy consumption. This dynamic operation allows the system to optimize performance for each operational phase rather than using a single fixed flow rate.
Solution Approach 2:
The system changes the flow rate parameter of the pressurized air source based on operational requirements. During initial fill, the flow rate is set to a high value to maximize filling speed. During normal operation, the flow rate is reduced to a low value to minimize energy consumption and noise, while still maintaining sufficient pressure to compensate for leaks and usage.
2Productivity
If a high flow pressurized air source is used, then the initial fill rate is improved, but the noise level increases during normal operation
Solution Approach 1:
The pump dynamically adjusts its operating mode based on the inflation stage. During initial fill, high-flow mode is activated to achieve rapid inflation. During normal operation, the system switches to low-flow mode, significantly reducing the noise generated by the pump while maintaining sufficient air pressure to compensate for leaks and usage.
Solution Approach 2:
The flow rate parameter is changed from high to low based on operational phase. This parameter change directly reduces the noise level during normal operation while preserving the high fill rate capability when needed, allowing the system to optimize for different operational requirements.
3Use of energy by moving object
If a low flow pressurized air source is used, then the energy consumption is reduced, but the initial fill rate becomes insufficient
Solution Approach 1:
The pump operates dynamically by switching between two modes: high-flow mode during initial inflation to rapidly fill the structure, and low-flow mode during normal operation to maintain pressure with minimal energy consumption. This dynamic operation allows the system to optimize performance for each operational phase rather than using a single fixed flow rate.
Solution Approach 2:
The system changes the flow rate parameter of the pressurized air source based on operational requirements. During initial fill, the flow rate is set to a high value to maximize filling speed. During normal operation, the flow rate is reduced to a low value to minimize energy consumption and noise, while still maintaining sufficient pressure to compensate for leaks and usage.
4Object-generated harmful factors
If a low flow pressurized air source is used, then the noise level is reduced, but the initial fill rate becomes insufficient
Solution Approach 1:
The pump dynamically adjusts its operating mode based on the inflation stage. During initial fill, high-flow mode is activated to achieve rapid inflation. During normal operation, the system switches to low-flow mode, significantly reducing the noise generated by the pump while maintaining sufficient air pressure to compensate for leaks and usage.
Solution Approach 2:
The flow rate parameter is changed from high to low based on operational phase. This parameter change directly reduces the noise level during normal operation while preserving the high fill rate capability when needed, allowing the system to optimize for different operational requirements.
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 achieves timely initial inflation while maintaining a constant flow rate and reducing energy consumption and noise, addressing the inefficiencies and noise issues associated with traditional systems.
Implementation Method 1
maintain a constant flow from the pump by dynamically varying the output of the pump to maintain an output pressure of the pump to a value slightly higher than the pressure in the inflatable support structure
Implementation Method 2
provides a flow of fluid to the inflatable support structure
Implementation Method 3
a first sensor operable to sense a pressure in the inflatable support structure and to communicate a signal indicative of the pressure in the inflatable support structure to the processor
Implementation Method 4
The circuit may provide a pulse-width modulated power signal to the variable output pump to vary the operation of the pump to control the pressure output by the variable output pump
Data Source
AI summary
A constant low-flow air source control system and method is used to operate a pump to inflate an inflatable support structure used to support a person.