Positive Displacement Pump Controller Oscillating Piston
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Solution Overview
Problem
Positive displacement pumps configured for compressible materials face challenges when handling non-compressible materials, leading to high torque demands on the rotational drive shaft during pump wash sequences, which can exceed the motor's capacity, and there is a need for optimizing performance in both high pressure and high flow operations.
Innovation Solution
A pumping system with a piston, drive shaft, eccentric, and connecting arm, controlled by a controller that oscillates the piston within specific pressure and flow regions, adjusting rotational speed and torque to manage mechanical advantage and flow rates effectively, allowing for efficient operation in high pressure and high flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the pump operates in high pressure region, then pressure delivery is improved, but torque demand increases excessively
Solution Approach 1:
The controller dynamically adjusts the drive shaft rotation between oscillating mode and continuous rotation mode based on operating conditions. In oscillating mode, the piston is confined to a smaller arc within the cylinder, dynamically reducing the stroke length and thereby reducing torque demand during high pressure operations.
Solution Approach 2:
The system changes the operational parameters by adjusting the piston travel arc and rotation speed. The controller modifies the rotation range from full circular rotation to a limited oscillating arc, and adjusts rotation speed to optimize the balance between pressure delivery and torque demand.
2Productivity
If the pump operates in high flow region, then flow rate is improved, but speed control becomes challenging
Solution Approach 1:
The controller implements dynamic speed control that adjusts rotational speed based on the desired operating region. For high flow operations, the system increases rotation speed while maintaining oscillating motion, enabling flow rate improvement with controllable speed variation.
Solution Approach 2:
The controller uses feedback from pressure and flow sensors to continuously adjust the rotation speed and oscillation parameters, maintaining optimal performance in high flow region while preventing excessive speed increases.
3Adaptability or versatility
If the pump handles non-compressible materials during wash sequences, then cleaning capability is improved, but motor overload occurs
Solution Approach 1:
The system dynamically switches to oscillating rotation mode when handling non-compressible materials during wash sequences. This confines the piston to a limited arc, reducing the work cycle and preventing excessive torque buildup that would otherwise overload the motor.
Solution Approach 2:
The controller changes operational parameters by reducing the rotation arc and adjusting speed to match the specific requirements of wash sequences, enabling safe handling of non-compressible materials without exceeding motor capacity.
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 effectively manages high pressure and flow demands by optimizing torque and speed control, ensuring consistent performance and preventing motor overload during pump wash sequences with non-compressible materials.
Implementation Method 1
A non-limiting exemplary embodiment of a pumping system includes a piston disposed within a piston cylinder, a drive shaft, an eccentric coupled to the drive shaft, and a connecting arm having opposing first and second ends
Data Source
AI summary
Non-limiting exemplary embodiments of a pumping system and methods for operating the pumping system in a region of high pressure or a region of high flow are disclosed. The pumping system includes a piston disposed within a piston cylinder, a drive shaft, an eccentric coupled to the drive shaft, a connecting arm having opposing first and second ends, and a controller for controlling the rotation of the drive shaft such that the piston oscillates within a region of high pressure or a region of high flow.