Non-Circular Discharge Port for Coating Straightness
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Solution Overview
Problem
Existing discharge devices for coating materials are prone to degrading coating quality due to disturbance elements like burrs or manufacturing errors around the discharge port, especially when dealing with high-viscosity materials, leading to uneven coating and gaps between coated areas.
Innovation Solution
A discharge device with a non-perfect circular discharge port and flow passage, designed to have a longer peripheral length than an imaginary perfect circular shape of the same area, which creates a kinetic energy difference that minimizes the influence of disturbance elements, ensuring the coating material is discharged straight and accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional circular discharge port is used, then the structure is simple, but disturbance elements cause the coating material to discharge in an inclined direction, degrading coating quality
Solution Approach 1:
The discharge port is designed with an asymmetric non-circular shape (such as elliptical or rectangular) instead of a conventional circular shape. This asymmetric geometry creates a longer peripheral length that generates a velocity difference between the center and periphery of the discharged coating material, forming a kinetic energy difference that counteracts the influence of disturbance elements and ensures straight discharge direction.
2Reliability
If the discharge port has a longer peripheral length, then the kinetic energy difference suppresses disturbance element influence, but the discharge port shape becomes more complex
Solution Approach 1:
The flow passage is designed with a non-uniform cross-sectional shape along its length, where the peripheral length varies at different sections. This local variation in geometry creates the necessary kinetic energy difference between center and periphery regions of the coating material flow, while maintaining overall structural simplicity through consistent basic geometry (such as a straight cylindrical passage with modified cross-section).
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 design enhances coating quality by stabilizing the discharge direction of the coating material, even with high viscosity, and allows for a high-quality coating film to be formed without gaps, as the kinetic energy difference at the center point counteracts the effects of disturbance elements.
Implementation Method 1
the coating material flowing through the flow passage becomes slow in velocity in the vicinity of the inner periphery of the flow passage but becomes fast in velocity in the vicinity of a center point of the flow passage, whereby a difference is produced in kinetic energy during the flow
Data Source
AI summary
A discharge device is equipped with a housing having a flow passage for enabling a coating material to flow and a plurality of discharge ports arrayed on a distal end surface of the housing in a width direction for discharging the coating material toward an object. The plurality of discharge ports are each formed in a non-perfect circular shape having a peripheral length being longer than an imaginary perfect circular shape which has the same area as the non-perfect circular shape. Further, a plurality of discharge flow passages are perpendicular to the discharge ports when viewed in a longitudinal sectional view, are the same shape as the discharge ports, and extend linearly.