Decanter Back Drive Control Using an Adjustable Speed Brake
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Solution Overview
Problem
Existing decanter systems lack the ability to efficiently and cost-effectively control the differential speed between the bowl and scroll, which is crucial for optimizing solid/liquid separation as the composition of the slurry varies over time.
Innovation Solution
A motor-driven decanter with a horizontal rotating bowl and scroll, utilizing an adjustable speed brake, such as a positive displacement pump, coupled to the gearbox to control the differential speed by adjusting the fluid flow through a fluid system, allowing for real-time optimization of separation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fixed gearbox pinion shaft is used, then the decanter provides a fixed differential speed between bowl and scroll, but the system lacks the ability to optimize separation for varying slurry compositions
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed pinion shaft with an adjustable speed brake that can dynamically change the scroll's rotational speed. The brake mechanism allows continuous adjustment of differential speed between the bowl and scroll, enabling the system to adapt to varying slurry compositions while maintaining a relatively simple mechanical structure without complex electronic controls.
2Adaptability or versatility
If existing technology providing infinite variability in pinion shaft rotational speed is used, then the decanter can optimize flow for any slurry composition, but the system becomes complex and expensive
Solution Approach 1:
The patent extracts the speed control function from the gearbox pinion shaft itself and implements it separately through an adjustable speed brake coupled to the scroll. This separation allows the main gearbox to remain simple and robust while the brake mechanism provides the necessary speed variability. The brake is driven by a hydraulic motor connected to a fluid system with a flow controller, providing continuous speed adjustment without complex electronic controls.
3Productivity
If the gearbox pinion shaft is rotated to optimize flow, then the solids discharge rate changes, but the control mechanism becomes more complex
Solution Approach 1:
The patent uses hydraulics to control the scroll speed and differential rotation. A hydraulic motor is coupled to the scroll and connected to a fluid system with a flow controller. By adjusting the fluid flow rate through the hydraulic motor, the scroll's rotational speed is easily controlled, which in turn adjusts the solids discharge rate. This hydraulic control mechanism is simpler and more intuitive than mechanical or electronic speed control systems.
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
This solution enables flexible control of differential speed, enhancing the efficiency of solid/liquid separation by adapting to changes in slurry composition, while being significantly less expensive than conventional systems.
Implementation Method 1
In one example, the adjustable speed brake is a positive displacement pump
Implementation Method 2
A decanter is a centrifuge that separates solid materials from a liquid
Data Source
AI summary
The present disclosure generally relates to a motor driven, high velocity decanter, and more particularly to a decanter which incorporates a horizontal rotating bowl and a rotating scroll. The decanter is capable of separating particulate material or solids from a liquid. A motor is coupled to and drives the bowl. Rotational power is transferred from the bowl to the scroll through a gearbox. An adjustable speed brake is coupled to the scroll to affect the differential speed between the bowl and the scroll. In one example, the adjustable speed brake is a positive displacement pump.