Coating Nozzle With Variable Diameter Flow Paths
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Solution Overview
Problem
Existing coating nozzles face issues with uneven film thickness and pressure loss in the communication hole paths due to reduced gaps between discharge holes, leading to interference and waste of coating material.
Innovation Solution
The coating nozzle features communication hole paths with varying lengths and diameters, including a large diameter portion and a smaller diameter portion, allowing for even pressure loss and film thickness by adjusting the diameters and lengths of the small diameter portions according to position, and incorporating a tapered connecting portion to prevent clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gap between discharge holes is reduced to achieve even coating, then coating uniformity is improved, but pressure loss becomes uneven and communication hole paths interfere with each other
Solution Approach 1:
The communication hole paths are designed with different diameters at different locations. Specifically, the communication hole paths have a first diameter in a first region and a second diameter in a second region, where the diameters vary along the path to compensate for pressure loss differences. This local variation in diameter allows each communication hole path to have optimized flow characteristics, ensuring even pressure distribution and coating uniformity without requiring reduced gaps between discharge holes.
2Manufacturing precision
If the gap between discharge holes is reduced to achieve even coating, then coating uniformity is improved, but communication hole paths interfere with each other
Solution Approach 1:
The communication hole paths are designed with different diameters at different locations. Specifically, the communication hole paths have a first diameter in a first region and a second diameter in a second region, where the diameters vary along the path to compensate for pressure loss differences. This local variation in diameter allows each communication hole path to have optimized flow characteristics, ensuring even pressure distribution and coating uniformity without requiring reduced gaps between discharge holes.
3Object-generated harmful factors
If the aperture is reduced to prevent interference of communication hole paths, then interference is prevented, but machining difficulty increases
Solution Approach 1:
Instead of uniformly reducing the aperture of all communication hole paths, the invention changes the parameter (diameter) of the communication hole paths based on their location and function. The communication hole paths have different diameters in different regions, with larger diameters where needed for adequate flow and smaller diameters where interference prevention is critical. This parameter variation allows interference prevention while maintaining manufacturability, as not all holes require minimal aperture.
Data Source
AI summary
A coating nozzle is provided. The coating nozzle includes: a chamber portion, communicated with a coating material supply portion; a supply surface, disposed on a side of the chamber portion; a discharge surface, disposed on other side of the chamber portion opposite to the supply surface and used to discharge the coating material; supply holes, annularly arranged on the supply surface with a first position as a center; discharge holes, arranged into at least one straight line on the discharge surface; and communication hole paths, respectively and correspondingly communicated from the supply holes on the supply surface to the discharge holes on the discharge surface. The communicating holes respectively have different lengths. The communication hole paths include a large diameter portion and a small diameter portion whose diameter is shorter that of the large diameter portion. The small diameter portions respectively have different diameters or lengths.