Motor Speed Control for Piston Pump Vibration Reduction
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Solution Overview
Problem
Piston pumps used in medical applications face issues with mechanical wear, high power consumption, weight, and vibrations due to their mechanical design, which complicates precise operations and increases operational costs.
Innovation Solution
A motor speed control apparatus for piston pumps that utilizes hall effect sensors and a computer system to control the piston's speed, allowing it to decelerate before compression and accelerate after, reducing the need for a flywheel or counterbalance, thereby minimizing power peaks and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a piston pump is used to achieve high pressure fluid delivery, then the pump can provide constant high pressure, but the mechanical parts are susceptible to wear and require frequent maintenance
Solution Approach 1:
The patent replaces the traditional mechanical piston pump system with a diaphragm pump system driven by a peristaltic rolling action. The diaphragm is actuated by a rolling mechanism that compresses the diaphragm to create fluid displacement, eliminating direct mechanical contact between moving parts and the fluid, thereby reducing mechanical wear while maintaining high pressure delivery capability
2Stress or pressure
If a piston pump is used to achieve high pressure fluid delivery, then the pump can provide constant high pressure, but the pump becomes heavy due to sturdy materials
Solution Approach 1:
The patent substitutes the heavy mechanical piston and cylinder assembly with a lighter diaphragm and rolling mechanism. The diaphragm acts as a flexible barrier that can be actuated by a rolling compression mechanism, significantly reducing the overall weight of the pump while maintaining the capability to generate high pressure for fluid delivery
Solution Approach 2:
The patent employs a diaphragm (a flexible thin film) as the primary fluid displacement element. This thin film can be actuated by the rolling mechanism to create pressure changes, replacing the need for heavy rigid piston cylinders and enabling a much lighter overall pump design while still achieving high pressure output
3Stress or pressure
If a piston pump is used to achieve high pressure fluid delivery, then the pump can provide constant high pressure, but more power is required to run the pump
Solution Approach 1:
The patent employs periodic peristaltic rolling action to actuate the diaphragm, creating rhythmic compression and expansion cycles. This periodic action allows the pump to build pressure efficiently through repeated small displacements rather than requiring continuous high-power mechanical input, reducing overall power consumption while maintaining high pressure delivery
Solution Approach 2:
The replacement of the high-power piston mechanism with a rolling compression mechanism that actuates the diaphragm reduces the power required to drive the pump. The rolling action distributes the mechanical work over time and distance, requiring less peak power while achieving the same high pressure output
4Stress or pressure
If a piston pump is used to achieve high pressure fluid delivery, then the pump can provide constant high pressure, but the pump produces intense vibrations that cause noise pollution and make precise measurements difficult
Solution Approach 1:
The patent replaces the vibration-prone piston and crankshaft mechanism with a diaphragm actuated by a rolling compression mechanism. The rolling action on the diaphragm creates smoother pressure changes with less mechanical vibration, eliminating noise pollution and enabling precise measurements while maintaining high pressure delivery capability
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 decreases the power supply rating, reduces the weight and cost of the piston pump, and minimizes vibrations, enhancing operational efficiency and precision in medical applications.
Implementation Method 1
A motor speed control apparatus for use with a piston pump may include a proximal hall effect sensor and a distal hall effect sensor
Data Source
AI summary
Provided for may be a motor speed control apparatus for use with a piston pump. The piston may be adapted to create a plurality of compressions and the piston may have a compression path and a decompression path. Further, the piston cylinder may include a proximal end, a distal end, and a piston length. The piston cylinder may have a proximal threshold position and a distal threshold position. In an embodiment, the apparatus includes a proximal and a distal hall effect sensor. The apparatus may comprise a computer, wherein instructions instruct the piston to decelerate at the distal threshold position during the compression path and the proximal threshold position during the decompression path, and/or wherein the computer executable instructions instruct the piston to accelerate at the distal threshold position during the decompression path and the proximal threshold position during the compression path.