Vibration Pump Frequency Control for Pressure and Flow Stability
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Solution Overview
Problem
Existing pump devices face challenges in downsizing while maintaining high pump pressure and flow rate, and require complex processes for measuring displacement and estimating resonance frequencies, which increase size and control time.
Innovation Solution
A pump control device utilizing a vibration actuator with electromagnetic drive, a sealed chamber, and a discharge portion, controlled by a control unit that adjusts drive frequency based on pressure feedback to optimize flow rate and pressure, incorporating a pressure detection unit and timer for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a measurement part is provided to measure displacement amount or displacement speed of the movable wall, then measurement capability is improved, but device size increases
Solution Approach 1:
The pump system uses itself to perform measurement functions. The control unit measures the drive voltage supplied to the vibration actuator and uses this information to infer the state of the movable wall, eliminating the need for separate measurement parts. This self-measurement approach maintains measurement capability while avoiding additional components that would increase pump size.
2Measurement precision
If frequency response characteristic measurement and resonance frequency estimation processes are performed, then control accuracy is improved, but control time increases
Solution Approach 1:
The control unit stores multiple types of frequency characteristics in advance, including resonance frequencies at different pressure points and drive voltages. During operation, the control unit directly retrieves and uses the appropriate pre-stored frequency characteristics based on current operating conditions, eliminating the need for real-time frequency response measurement and resonance frequency estimation processes.
3Volume of stationary object
If the pump is downsized, then device size is reduced, but pump pressure and pump flow rate capability deteriorate
Solution Approach 1:
The pump system dynamically adjusts the drive frequency of the vibration actuator based on real-time pressure feedback from the pressure detection unit. The control unit selects from pre-stored frequency characteristics corresponding to different pressure levels, enabling the compact pump to adapt its operating parameters to maintain high pump pressure and flow rate capabilities despite reduced physical size.
Solution Approach 2:
The system changes the drive frequency parameter according to the detected pressure level. By storing and switching between multiple frequency characteristics (resonance frequencies at different pressures and drive voltages), the compact pump can optimize its performance parameters to achieve high pressure and flow rate output without requiring a larger physical structure.
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 enables a compact pump design with enhanced pressure and flow rate capabilities, stable operation, and reduced control time.
Implementation Method 1
a vibration actuator for vibrating a vibrating body due to electromagnetic drive caused by electrical current supply to a coil
Implementation Method 2
the control unit controls the drive frequency so that the electrical current is supplied to the coil with a resonance frequency of the vibrating body
Data Source
AI summary
A pump control device controls a pump including a vibration actuator for vibrating a vibrating body due to electromagnetic drive caused by electrical current supply to coils, a sealed chamber which includes a movable wall which can be displaced by vibration of the vibrating body so that fluid can be suctioned into an inside of the sealed chamber or discharged from the inside of the sealed chamber, and a discharge portion for communicating the fluid between the sealed chamber and a tank to increase pressure of the fluid. The pump control device contains an obtaining part for obtaining pressure value information, and a control unit for controlling a drive frequency of an electrical current to be supplied to the coils based on the obtained pressure value information.