Abrasive Fluid-Jet Cutting Interrupter Unit Design
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Solution Overview
Problem
Existing abrasive fluid jet cutting devices face challenges in efficiently integrating and metering abrasive particles into high-pressure fluid jets for optimal cutting and decoating effects, often requiring complex and costly systems to manage particle flow and nozzle loading.
Innovation Solution
The device incorporates a servo-hydraulic interrupter unit with a control chamber and mixing chamber design that uses diverted control fluid to introduce abrasive particles into the high-pressure fluid jet, ensuring precise metering and mixing, reducing mechanical stress on the nozzle, and eliminating the need for additional fluid return lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abrasive particles are fed into the high-pressure fluid jet using conventional mixing devices, then the cutting and decoating effect is improved, but the system complexity and cost increase due to additional metering and control mechanisms
Solution Approach 1:
The patent combines the interrupter unit control fluid system with the abrasive particle feed system. The control fluid that is diverted from the main high-pressure line is routed through the abrasive channel to pick up particles, and then both the control fluid and abrasive particles are fed together into the mixing chamber. This merging eliminates the need for separate abrasive metering pumps and control systems, reducing device complexity while maintaining reliable cutting performance.
Solution Approach 2:
The control fluid serving the interrupter unit is given a dual function: it not only controls the pulsating jet operation but also serves as the transport medium for abrasive particles. By using this existing control fluid flow for particle delivery, the system avoids adding dedicated particle feed infrastructure, thereby reducing overall system complexity while ensuring consistent cutting效果.
2Reliability
If a separate fluid return line is added to convey control fluid back to the tank, then the control system is complete, but the device complexity and fluid circulation requirements increase
Solution Approach 1:
The patent merges the control fluid discharge path with the abrasive particle feed path. Instead of creating a separate return line for control fluid, the discharged control fluid is routed through the abrasive channel where it picks up particles, and then both fluids converge in the mixing chamber. This eliminates the need for a dedicated return line to the tank, reducing device complexity while maintaining proper control system function.
3Productivity
If abrasive particles are introduced at high pressure directly into the nozzle, then the cutting effect is maximized, but the nozzle experiences excessive mechanical stress and shortened service life
Solution Approach 1:
The patent introduces abrasive particles into the control fluid at low pressure in the abrasive channel before the high-pressure mixing chamber. The particles are pre-loaded into the control fluid stream at a location where pressure is still relatively low, allowing them to be gently incorporated into the fluid flow without experiencing the full mechanical stress of high-pressure nozzle operation. This preliminary particle introduction protects the nozzle while ensuring particles are present for effective cutting.
Solution Approach 2:
The control fluid acts as an intermediary medium that transports abrasive particles from the low-pressure abrasive channel to the high-pressure mixing chamber. The particles are carried by the control fluid rather than being forced directly into the high-pressure system, which reduces mechanical stress on the nozzle while ensuring particles reach the jet for effective cutting.
4Measurement precision
If the control fluid quantity is diverted to feed abrasive particles, then particle metering is achieved, but the available control fluid for interrupter operation is reduced
Solution Approach 1:
The control fluid is given dual functionality: it serves both the interrupter unit operation and the abrasive particle transport. The same control fluid that controls the pulsating jet is also routed through the abrasive channel to pick up and deliver particles to the mixing chamber. This multi-functionality ensures adequate particle metering while maintaining sufficient control fluid for interrupter operation, as no separate fluid supply is needed for particle delivery.
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 allows for efficient and precise addition of abrasive particles, enhancing cutting and decoating performance while minimizing nozzle wear and fluid usage, achieving effective cutting at lower pressures with improved reliability and reduced operational complexity.
Implementation Method 1
a fluid, preferably water, is compressed by means of a high-pressure pump and fed to a nozzle that can emit a high-pressure fluid jet
Implementation Method 2
the control piston moves into it due to the hydraulic forces and thus releases the connection between a compressor unit and the nozzle
Implementation Method 3
The particles mixed with the high-pressure fluid are accelerated with the high-pressure fluid jet and hit the workpiece to be machined together with it
Data Source
Figure 1
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AI summary
Device for abrasive fluid-jet cutting with a compressor unit (1) for compressing a fluid, which can be fed to a nozzle (25) in the form of a stream of high-pressure fluid, wherein the nozzle (25) is designed for discharging a high-pressure fluid jet (33). The stream of fluid to the nozzle (25) can be interrupted, or at least greatly restricted, by an interrupter unit (6), wherein the interrupter unit (6) comprises a control chamber (8), which can be filled with high-pressure fluid and can be connected to a drainage chamber (19) by way of a control valve (14). The quantity of control fluid removed by way of the control valve (14) flows through a feed line (20) into a mixing chamber (27), wherein an abrasive channel (22) carrying abrasive particles opens out into the feed line (20) and the quantity of control fluid mixes with the high-pressure fluid jet (33).