Electrostatic Nozzle With Insulated Metal Tip
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Solution Overview
Problem
Existing electrostatic nozzles face challenges in applying liquid to narrow gaps without causing electric discharge, as the insulator-based nozzle ends lack stiffness, making it difficult to insert into thin, deep spaces and risking damage to workpieces.
Innovation Solution
An electrostatic nozzle design featuring a metal distal-end nozzle part with high stiffness, insulated from a conductive tubular electrode by an intermediate insulator, allowing the nozzle to be inserted into narrow gaps while preventing electric discharge by maintaining a controlled voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nozzle end part is made of an insulator to prevent electric discharge, then electric discharge is prevented, but the nozzle end part has low stiffness and cannot be inserted into narrow gaps
Solution Approach 1:
The nozzle is divided into multiple segments: a conductive main body for voltage application, an insulating intermediate section for discharge prevention, and a thin metal distal end for stiffness and narrow gap insertion. This segmentation allows each part to fulfill its specific function without compromise
Solution Approach 2:
Different parts of the nozzle have different material properties tailored to their specific functions: the main body is conductive for charging liquid, the intermediate part is insulating for preventing discharge, and the distal end is metallic for providing stiffness. This local differentiation resolves the contradiction by optimizing each region independently
2Length of moving object
If the nozzle end part is made thin to insert into narrow gaps, then insertion into narrow gaps is enabled, but electric discharge occurs between the nozzle and workpiece
Solution Approach 1:
An insulating intermediate section is introduced between the conductive main body and the thin metal distal end. This intermediary prevents electrical conduction from the main body to the distal end, eliminating the harmful electric discharge effect while allowing the thin distal end to be inserted into narrow gaps
3Reliability
If voltage is applied to the nozzle to charge liquid, then liquid application is improved, but electric discharge occurs when the nozzle is close to the workpiece
Solution Approach 1:
The potential for electric discharge is extracted and isolated from the liquid discharge path by placing an insulating section between the voltage application point and the nozzle exit. This allows voltage to be applied for effective liquid charging while the insulator prevents discharge to the workpiece
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
Enables precise application of liquid to narrow gaps without electric discharge, ensuring reliable application and preventing damage to workpieces, such as semiconductor modules, by utilizing a thin metal nozzle end with insulation from the conductive electrode.
Implementation Method 1
Voltage can be applied on the metal-made main body to thereby electrically charge the liquid that flows therethrough
Implementation Method 2
The third pipe is insulated from the first pipe by the second pipe
Data Source
AI summary
An electrostatic nozzle includes a first pipe, a second pipe, and a third pipe. The first pipe is configured of a conductor. Voltage is applied on the first pipe by a power source. The second pipe is configured of an insulator and connected to the first pipe. The third pipe is configured of a metal, connected to the second pipe, insulated from the first pipe by the second pipe, and thinner than the second pipe. Liquid which has flown through the first pipe, the second pipe, and the third pipe is discharged from a distal end of the third pipe.