Servo Motor Ultra High Pressure Pump with Feedback Control
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Solution Overview
Problem
Existing ultra high pressure pumps for waterjet cutting apparatus face challenges in compactness, efficiency, reliability, and pressure regulation with minimal variation, and are not easily adaptable to various existing machines.
Innovation Solution
A servo motor-driven ultra high pressure pump with a feedback loop and pressure sensor system that allows real-time pressure control, using a hollow rotor shaft and ball screw mechanism to achieve pressures greater than 3447,3786 bar (50,000 psi) with minimal pressure variation, and is designed for compactness and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ultra high pressure pumps are used, then pressure generation capability is achieved, but pressure regulation accuracy and minimal pressure variation deteriorate
Solution Approach 1:
The patent implements a feedback control system using a pressure sensor that continuously monitors the output pressure and feeds this information back to the servo motor controller. This closed-loop feedback mechanism enables real-time adjustment of the servo motor to maintain precise pressure regulation with minimal variation, directly resolving the contradiction between pressure regulation accuracy and pressure stability.
2Volume of moving object
If pump size is reduced for compactness, then space requirements are minimized, but reliability and pressure control capability worsen
Solution Approach 1:
The patent replaces conventional mechanical pressure control mechanisms with a servo motor-driven system featuring electronic feedback control. This substitution enables compact pump design while maintaining superior pressure control capability and reliability, as the electronic control system can achieve precise pressure regulation without requiring large mechanical components.
3Measurement precision
If pressure control system is enhanced for accuracy, then pressure regulation improves, but device complexity increases
Solution Approach 1:
The patent employs a feedback control system where a pressure sensor monitors output pressure and feeds this information back to the servo motor controller. This closed-loop approach achieves high pressure control accuracy while keeping the system relatively simple, as the feedback mechanism automatically adjusts operations without requiring complex manual 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
The solution enables the pump to operate efficiently and reliably at ultra high pressures with minimal pressure variation, allowing for faster cutting speeds and higher quality edge finishes, while reducing wear on components and enabling rapid diagnostics of leaks.
Implementation Method 1
a servo motor adapted to axially rotate a hollow rotor shaft in alternating directions, the servo motor having a stator positioned co-axially around the hollow rotor shaft
Implementation Method 2
the interior of the rotor shaft being co-axially coupled to drive means to convert axial rotation into reciprocal displacement
Implementation Method 3
whereby alternating rotation of the rotor shaft causes reciprocal linear displacement of the pistons to pressurise fluid in the pumping chambers to pressures greater than 3447,3786 bar (50,000 psi)
Data Source
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AI summary
An ultra high pressure pump comprising a servo motor coupled to a piston having a head arranged within a cylinder to define a pumping chamber, whereby the servo motor rotation causes reciprocal displacement of the piston to pressurise fluid in the pumping chamber to pressures greater than 50,000 psi, the servo motor having a feedback loop coupled to a computer, the feedback loop including a pressure feedback signal to control the pump pressure in real time.