Regulator Pump Isolation for Accurate Low-Flow Mix Ratio Control
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Solution Overview
Problem
Existing flow control systems face challenges in accurately regulating low-pressure and low-flow rate applications of materials like paints and coatings, where the differential between upstream and downstream flow rates affects the mix ratio accuracy, especially for plural component materials.
Innovation Solution
A flow regulating system comprising a regulator pump that isolates downstream pressure from upstream pressure, using a controller, actuator, and valves to maintain desired downstream flow rates and pressures independent of upstream conditions, allowing for precise control and consistent material application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow regulating devices (control valves, pressure regulators) are used to alter upstream fluid pressure to downstream material flow rate, then downstream pressure and flow rate can be controlled, but the downstream pressure and flow rate remain dependent on upstream pressure, affecting mix ratio accuracy
Solution Approach 1:
The system divides the material supply into separate components (Component A and Component B) with independent metering mechanisms. Each component has its own flow control that is independent of upstream pressure variations, allowing precise mix ratio control without downstream pressure dependency affecting the entire system.
Solution Approach 2:
The patent introduces intermediate flow control devices (metering pumps, flow meters) between the upstream material supply and downstream application. These intermediaries measure and regulate flow rates independently of upstream pressure fluctuations, ensuring accurate mix ratios while maintaining downstream flow independence.
2Reliability
If material supply provides minimum flow rate and pressure higher than desired downstream flow rate, then material can be supplied reliably, but the differential between desired downstream flow rate and minimum supply flow rate affects mix ratio accuracy
Solution Approach 1:
The system uses dynamic flow control mechanisms that can adjust metering rates in real-time. The metering pumps or flow control valves dynamically regulate the flow of each component based on actual downstream requirements, allowing the system to maintain accurate mix ratios even when upstream supply pressure and flow vary within a range.
Solution Approach 2:
The patent changes the operating parameters of material supply by using positive displacement pumps or metering devices that deliver precise volumetric flow rates independent of pressure variations. This allows the system to maintain desired downstream flow rates and mix ratios while accepting material supply at higher minimum flow rates and pressures.
3Measurement precision
If downstream pressure is dependent on upstream pressure, then flow regulating devices can operate simply, but accurate control of low flow rates and pressures is difficult to achieve
Solution Approach 1:
The patent replaces traditional mechanical pressure-dependent flow control with positive displacement metering pumps or electronically controlled flow meters. These devices use mechanical displacement or electronic control to deliver precise volumetric flow rates independent of downstream pressure, achieving accurate low flow rate control without complex pressure compensation mechanisms.
Data Source
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AI summary
A regulator pump provides disconnects an inflow from an outflow, such that a downstream pressure is unaffected by an upstream pressure. The regulator pump receives a fluid through an input valve, while an output valve remains in a closed position. The fluid continues to flow to the regulator pump until the regulator pump is full. With the regulator pump filled with the fluid, the inlet valve shifts to a closed position, thereby isolating the regulator pump chamber from the fluid source. The regulator pump drives the fluid downstream to an applicator with the inlet valve closed. The regulator pump fully isolates the upstream fluid from the downstream fluid such that the upstream pressure has no effect on the downstream pressure.