Independent Fluid Pump Control for Accurate Ratio Delivery
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Solution Overview
Problem
Multi-component fluid delivery systems, such as two-part Spray Polyurethane Foam systems, face challenges in maintaining precise fluid ratio control due to uneven wear and pressure differences between pumps, leading to off-ratio delivery, yield reduction, and clogging issues.
Innovation Solution
The system employs independently controlled, non-mechanically coupled fluid pumps with a control system that calculates and compensates for the slip factor and slip ratio using pressure sensors, enabling precise ratio control through a master-slave motor control mechanism, allowing for independent pressure and ratio management of fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanically coupled pumps are used to deliver multiple fluid components, then the mechanical linkage ensures synchronized operation, but uneven wear and pressure differences between pumps cause off-ratio delivery and reduce reliability
Solution Approach 1:
The system divides the pump control into independent segments (first fluid pump and second fluid pump) that are not mechanically coupled. Each pump is independently controlled by separate motors, eliminating the mechanical linkage that causes uneven wear and pressure differences while maintaining synchronized operation through electronic control system coordination
Solution Approach 2:
The control system continuously monitors the actual fluid delivery ratio and pump operating conditions, then adjusts motor speeds and pressures in real-time to compensate for wear and pressure differences. This closed-loop feedback ensures consistent fluid ratio control despite individual pump variations
2Adaptability or versatility
If independently controlled pumps are used without mechanical coupling, then each pump can be controlled independently for pressure and ratio management, but precise ratio control becomes difficult due to lack of mechanical synchronization
Solution Approach 1:
The system dynamically adjusts the operating parameters (speed, pressure, flow rate) of each independently controlled pump in real-time based on feedback from sensors and the control algorithm. This dynamic control allows the system to maintain precise fluid ratios while adapting to changing conditions and individual pump characteristics
Solution Approach 2:
The control system modifies operational parameters (motor speed, valve positions, pressure settings) of each pump independently to achieve the desired fluid delivery ratio. By changing these parameters dynamically, the system compensates for the lack of mechanical coupling and maintains precision
3Measurement precision
If slip factor variations between pumps occur due to wear and pressure differences, then pump performance diverges, but detecting and measuring the actual slip ratio becomes complex
Solution Approach 1:
The system replaces complex mechanical slip measurement devices with electronic sensors and computational algorithms. Pressure sensors, flow meters, and motor feedback provide electrical signals that the control system processes to calculate slip ratios, eliminating the need for complex mechanical measurement apparatus
Data Source
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AI summary
A multi-component fluid delivery system (100) includes a first fluid pump (12) and a second fluid pump (14). The first and the second fluid pumps are not mechanically coupled to each other. The multi-component fluid delivery system further includes a control system (38) comprising a processor configured to derive a slip ratio for the first fluid pump (12) and the second fluid pump (14). The processor is additionally configured to apply a master-slave motor control to deliver a specified fluid ratio via the first and the second fluid pumps based on the slip ratio.