Angled Nozzle Design for High-Pressure Fluid Deburring
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Solution Overview
Problem
Conventional methods for treating the interior of workpieces, such as injection system components, face inefficiencies in removing burrs and dirt due to poor energy transformation, wear of abrasive particles, and contamination, which hinder reliable surface cleaning and deburring, especially in miniaturized and high-power-density components.
Innovation Solution
A nozzle design with angled nozzle passages and a raised bottom constriction that directs high-pressure fluid jets effectively onto the surface, minimizing cavitation and erosion, and allowing for stable jet direction and prolonged service life, while avoiding cushion formation and facilitating efficient deburring and surface treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nozzles are located outside the workpiece to treat interior surfaces, then the workpiece can be accessed for treatment, but energy transformation is poor and treatment effectiveness is insufficient
Solution Approach 1:
The nozzle is inserted into the workpiece interior through existing openings, allowing the treatment surface to be directly accessed from within. This nested configuration eliminates the distance problem of external nozzles and enables effective energy transfer to the treatment surface without energy loss over distance.
Solution Approach 2:
The nozzle passages are arranged at angles less than or equal to 90° to the feed bore axis, creating a multi-dimensional flow configuration. This angular arrangement optimizes the direction of the liquid jet to strike the treatment surface perpendicularly, maximizing energy transformation and treatment effectiveness.
2Reliability
If high-pressure jets are used for deburring, then cleaning effectiveness improves, but water cushions and liquid flow-off disturb the jets and reduce effectiveness
Solution Approach 1:
The nozzle is divided into multiple separate nozzle passages (at least two) arranged at different angles. This segmentation allows each passage to independently direct jets at specific treatment zones, preventing the formation of destabilizing water cushions between adjacent jet streams while maintaining high cleaning effectiveness.
Solution Approach 2:
The nozzle passages are asymmetrically arranged at different angles relative to the feed bore axis, with each passage oriented to optimize its jet direction for specific surface regions. This asymmetric configuration prevents symmetric water cushion formation that would disturb the jets, while maximizing the disruptive effect on burrs and contaminants.
3Reliability
If abrasive particles are used for treatment, then cleaning and deburring effectiveness improves, but particle wear and contamination increase operating costs
Solution Approach 1:
The invention uses pure hydraulic energy from high-pressure liquid jets to achieve deburring and cleaning without abrasive particles. The kinetic energy of the liquid medium itself is sufficient to remove burrs and contaminants, eliminating the need for abrasive particles and thereby preventing particle wear and contamination issues.
Solution Approach 2:
The mechanical action of abrasive particles is replaced by the hydraulic impact of high-pressure liquid jets. The liquid medium's kinetic energy, generated by pressure differential and optimized nozzle geometry, substitutes for the mechanical abrasion of particles, achieving the same surface treatment effect without the associated wear and contamination problems.
4Ease of manufacture
If nozzle passages are conventional in design, then manufacturing is simple, but cavitation and erosion wear at the outlet reduce service life
Solution Approach 1:
The nozzle passages are designed with specific angular parameters (angles less than or equal to 90° to the feed bore axis) and optimized cross-sectional dimensions. These parameter changes optimize the flow characteristics to prevent cavitation and erosion wear, significantly extending nozzle service life while maintaining manufacturability through standard machining processes.
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 nozzle design enhances the transformation of kinetic energy for effective deburring and surface treatment, significantly increasing service life and improving the quality of interior surface cleaning, particularly in complex geometries like injection components, enabling reliable and efficient series production.
Implementation Method 1
The fluid medium, preferably water or emulsions, which discharges under high pressure from nozzle passages, is supposed to loosen dirt and burrs on the inner surface of the bores and openings on account of the high kinetic energy of the medium
Implementation Method 2
the medium is directed in such a way that cavitation within the nozzle passage and erosion wear at the outlet of the nozzle passage are largely avoided
Data Source
AI summary
A nozzle for treating an interior of a workpiece by means of a highly pressurized fluid medium flowing out of at least one nozzle channel. The nozzle channel branches off from a supply borehole provided in the form of a blind hole. The nozzle is designed in such a manner that the nozzle channel, starting from the bottom end area of the supply borehole, extends at an angle less than or equal to 90° to the supply bore hole in the inflowing direction, the bottom of the supply borehole being provided with an elevation whereby narrowing the transition area to the nozzle channel.