Adjustable Piezo Dosing Actuator for Thermal Drift Compensation
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Solution Overview
Problem
Existing dosing systems, particularly those with piezoelectric actuators, face challenges in maintaining high dosing accuracy due to fluctuations in actuator frequency, thermal elongation, and component wear, leading to deviations between desired and actual dosed amounts.
Innovation Solution
Incorporating a second actuator, such as an expansion material element, to adjust and maintain the position of the piezo actuator relative to the discharge element and nozzle, compensating for thermal changes and wear, ensuring precise dosing by controlling the expansion material element's temperature and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a piezoelectric actuator is used to control the discharge element, then dosing speed and response time are improved, but dosing accuracy deteriorates due to thermal elongation and frequency fluctuations
Solution Approach 1:
A second actuator is introduced as an intermediary component between the piezoelectric actuator and the discharge element. This second actuator compensates for position deviations caused by thermal elongation and frequency fluctuations, maintaining accurate dosing while allowing the piezoelectric actuator to operate at high speeds
Solution Approach 2:
The system dynamically adjusts the position of the discharge element by changing the expansion state of the second actuator. By monitoring actual position deviations from the dosing substance, the system modifies the second actuator's parameters to compensate for thermal and frequency variations, maintaining dosing accuracy
2Manufacturing precision
If the discharge element position is adjusted to compensate for wear and thermal changes, then dosing accuracy is improved, but device complexity increases
Solution Approach 1:
The second actuator serves multiple functions: it compensates for thermal elongation, compensates for wear, and maintains optimal discharge element positioning. This single component addresses multiple sources of error, improving dosing accuracy without proportionally increasing system complexity
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 improved dosing accuracy by maintaining a consistent position and stroke of the discharge element, reducing wear-related issues and thermal fluctuations, thereby enhancing the precision of dosing operations.
Implementation Method 1
Incorporating a second actuator, such as an expansion material element, to adjust and maintain the position of the piezo actuator relative to the discharge element and nozzle, compensating for thermal changes and wear, ensuring precise dosing by controlling the expansion material element's temperature and position.
Implementation Method 2
at least one first actuator, preferably a piezo actuator, coupled to the discharge element and/or the nozzle
Data Source
AI summary
The invention relates to dosing system (1) for a dosing substance, which dosing system (1) comprises a housing (11) having a nozzle (60) and a feed channel (64) for dosing substance, a discharge element (51) arranged in the housing (11) for discharging dosing substance from the nozzle (60), at least one first actuator (20), preferably a piezo actuator (20), coupled to the discharge element (51) and/or the nozzle (60), and at least one second actuator (30), preferably an expansion material element (30), coupled to the first actuator (20). The second actuator (30) is designed to set a position of the at least one first actuator (20) relative to the housing (11), particularly with respect to the discharge element (51) and/or the nozzle (60). The invention further relates to a method for controlling such a dosing system (1).