Calibratable Variable Displacement Pump With Adjustable Home Position
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Solution Overview
Problem
Existing variable displacement pumps require manual adjustment for output volume per revolution, and electronic adjustment methods face challenges with precise calibration due to dimensional variations and inherent tolerances, leading to inaccurate flow volumes.
Innovation Solution
A calibration system for electronically adjustable dispensing pumps using a linear actuator, proximity sensor, and adjustable flag to determine and adjust the home position of the actuator, ensuring precise control over the angle between base portions for accurate flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual adjustment methods (adjusting screw or fixed links) are used to change output volume per revolution, then the pump can be set to a specific displacement, but the pump cannot be electronically adjusted and requires manual intervention for each volume change
Solution Approach 1:
The patent replaces manual mechanical adjustment (hands-on screw turning or link repositioning) with an automated linear actuator system. The linear actuator uses electromagnetic or electrostatic forces to automatically adjust the angle between base portions, eliminating the need for manual intervention while maintaining precise control over pump displacement.
Solution Approach 2:
The calibration system enables the pump to self-calibrate by using the proximity sensor to detect the flag position and automatically determine the home position of the linear actuator. The system performs its own calibration without requiring external manual adjustment, making it self-sufficient for maintaining accurate dispense volumes.
2Extent of automation
If rigid members are used to translate linear motion to angular motion for electronic adjustment, then the angle can be electronically changed, but the relationship between linear motion and angular movement becomes complex and difficult to calibrate
Solution Approach 1:
The patent introduces a proximity sensor as an intermediary between the linear actuator and the control system. The sensor detects the flag's position and provides feedback to determine the home position, creating a reliable reference point that simplifies the relationship between linear actuator motion and angular base adjustment, thereby improving calibration accuracy.
Solution Approach 2:
The system performs preliminary calibration by establishing a known home position using the proximity sensor and flag interaction before normal operation begins. This preliminary action sets a reliable reference point that simplifies subsequent electronic adjustments and ensures accurate dispense volumes from the start of operation.
3Ease of manufacture
If dimensional variations and tolerances in pump components are present, then manufacturing is feasible, but the home position of the linear actuator cannot be reliably determined leading to inaccurate flow volumes
Solution Approach 1:
The patent implements a feedback mechanism using the proximity sensor to detect the flag's position. The sensor provides real-time information about the linear actuator's position, allowing the system to accurately determine the home position despite dimensional variations in components. This feedback loop compensates for manufacturing tolerances and ensures reliable flow volume control.
Solution Approach 2:
The calibration system allows for adjustment of the home position parameter by modifying the flag's position relative to the proximity sensor. This parameter change capability enables the system to compensate for dimensional variations in manufactured components, ensuring accurate flow volumes even when component tolerances vary within acceptable ranges.
4Manufacturing precision
If a calibration system with proximity sensor and adjustable flag is implemented, then precise and repeatable electronic adjustment is achieved, but the device complexity increases
Solution Approach 1:
The proximity sensor and flag assembly serve multiple functions: they establish the home position, provide feedback for electronic control, and enable calibration adjustments. This multi-functionality reduces the need for separate components for each function, thereby minimizing the overall increase in device complexity while achieving precise dispense volume control.
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 precise and repeatable electronic adjustment of dispense volumes without manual intervention, allowing for reliable calibration and consistent flow rates.
Implementation Method 1
A proximity sensor is secured to the base upper position. A flag is secured to the drive rod coupler, wherein the flag moves directly with the drive rod. The calibration element is adapted to activate the proximity sensor when the linear drive is in a home position.
Data Source
AI summary
A dispensing pump having a calibration system including a base including an upper base portion having a first end for mounting a motor and a second end and a lower base portion for mounting a pump on a first end and a second end. A hinge pivotally connects the second end of the upper base portion and the second end of the lower base portion. A linear actuator is mounted on the base and includes a drive rod having a coupler secured to an end thereof. The coupler joins the drive rod to a first end of a connecting member. A second end of the connecting member is secured to the lower base portion. An attachment plate attaches the motor to the first end of the upper base portion. The attachment plate extends outwardly from the motor for mounting the linear actuator. A proximity sensor is secured to the base upper position. A flag is secured to the drive rod coupler, wherein the flag moves directly with the drive rod. The flag includes a body and a calibration element projecting therefrom. The calibration element is positionally adjustable relative to the flag body. The calibration element is adapted to activate the proximity sensor when the linear drive is in a home position. The home position is adjustable upon adjustment of the calibration member. An actuation of the linear actuator drives the connecting member causing the lower base portion and upper base portion to pivot with respect to each other about the hinge, thereby changing an angle between the lower base portion and the upper base portion.