Fluid Pressure Producing Device for Waterjet Cutting
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Solution Overview
Problem
Fluid pressure producing devices that use a double-acting piston to drive a plunger and pressurize a fluid experience significant pressure fluctuations due to pump discharge performance, direction control valve response delays, and fluid compressibility, which disrupt the stability of waterjet cutting processes.
Innovation Solution
A method and device that detect the piston's movement end, adjust the working medium pump's load, and implement feedback control to maintain a target fluid pressure by switching the piston direction and optimizing the working medium pump's flow rate, using a controller with units for moving direction control, load determination, and fluid pressure feedback to stabilize the pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a double-acting piston is used to drive the plunger with working medium pressure, then the fluid can be pressurized, but large pressure pulsations occur due to pump discharge performance, valve response delays, and fluid compressibility
Solution Approach 1:
The controller performs preliminary actions by detecting piston position in advance and switching the working medium pump's discharge direction before the piston reaches the end of its stroke. This proactive direction switching prevents pressure pulsations by ensuring smooth transitions, eliminating the need for complex pressure control systems during piston reversal.
Solution Approach 2:
The system implements feedback control by detecting the piston's position and using this information to control the working medium pump's discharge direction. The controller continuously monitors piston movement and adjusts pump operation accordingly, creating a closed-loop system that maintains stable fluid pressure despite pump discharge characteristics and valve response delays.
2Stability of the object's composition
If the piston moving direction is switched frequently to maintain pressure, then pressure stability improves, but the working medium pump load increases
Solution Approach 1:
The system dynamically adjusts the working medium pump's discharge direction based on real-time piston position detection. Rather than fixed or frequent switching, the pump operation is optimized to match the actual piston state, reducing unnecessary direction changes and minimizing energy loss while maintaining pressure stability.
3Speed
If the working medium pump operates at maximum flow rate, then the response speed improves, but the pump load increases significantly
Solution Approach 1:
The controller switches the pump discharge direction in advance based on detected piston position, allowing the system to prepare for pressure changes before they occur. This preliminary action enables faster pressure response without requiring the pump to continuously operate at maximum flow rate, thereby reducing energy consumption.
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 effectively reduces pressure fluctuations, stabilizes the fluid pressure waveform, and enhances the reliability of waterjet cutting by promptly reaching and maintaining target pressures, reducing power consumption and extending the device's maintenance interval.
Implementation Method 1
a working medium pump configured to pressurize a working medium
Implementation Method 2
a piston configured to reciprocate in a first cylinder with the pressurized working medium
Implementation Method 3
a plunger connected to the piston and configured to reciprocate in a second cylinder to pressurize the fluid
Data Source
AI summary
A fluid pressure producing method reduces fluctuations in the pressure of a fluid pressurized using a plunger driven by applying the pressure of a working medium to a double-acting piston. The method includes switching a moving direction of the piston when detecting the piston reaching a movement end, operating the working medium pump to discharge the working medium at a maximum flow rate while the load is less than the load limit after the moving direction of the piston is switched, and detecting a pressure of the fluid and feeding back the detected pressure of the fluid and performing feedback control of the pressure of the fluid to eliminate a difference between the pressure of the fluid and a target pressure of the fluid.