Showerhead Bush Assembly to Prevent Thread-Induced Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing showerhead assemblies in substrate processing apparatuses are prone to cracking due to the formation of threads in the groove of the showerhead, which occurs during the repeated coupling and decoupling process of the bush unit, leading to damage and the need for frequent replacement.
Innovation Solution
The proposed showerhead assembly eliminates the need for threads in the groove of the showerhead by using a bush unit with a polyhedral structure that is inserted into an insertion groove with a larger lower end area, allowing for secure coupling without the risk of cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bush is coupled to the showerhead by screw coupling with threads formed in the groove of the showerhead, then the showerhead and gas distribution plate can be fastened together, but cracks are generated in the showerhead due to repeated screwing and unscrewing operations
Solution Approach 1:
The invention extracts the thread formation from the showerhead groove and relocates it to the bush unit. The bush unit now carries the threaded structure (second coupling groove) while the showerhead groove becomes a simple insertion groove without threads, eliminating the source of cracks in the showerhead.
Solution Approach 2:
The bush unit serves as an intermediary component between the showerhead and gas distribution plate. It absorbs the mechanical stress of repeated coupling operations through its own threaded structure, protecting the showerhead from damage while maintaining fastening functionality.
2Reliability
If threads are formed in the groove of the showerhead for bush coupling, then secure fastening is achieved, but the showerhead requires frequent replacement due to crack propagation
Solution Approach 1:
The threaded structure is extracted from the showerhead and placed in the bush unit. This allows the showerhead to be reused indefinitely through cleaning and re-polishing processes, while the bush unit absorbs the wear from repeated coupling and decoupling operations.
3Force
If a bush is inserted into a groove with threads for secure coupling, then fastening force is maintained, but the bush and showerhead assembly becomes difficult to decompose during cleaning processes
Solution Approach 1:
The invention segments the coupling function into two parts: the showerhead groove (simple insertion without threads) and the bush unit (with threaded second coupling groove). This segmentation allows the bush to be easily removed from the showerhead during maintenance while maintaining secure fastening during operation.
Data Source
AI summary
A showerhead assembly of a substrate processing apparatus, which is positioned below a gas distribution plate in which a first coupling groove is formed, comprises a showerhead plate provided with an insertion groove formed at a position facing the first coupling groove in a vertical direction; a bush unit inserted into the insertion groove and formed with a second coupling groove having the same central axis as that of the first coupling groove; and a fastening unit coupled to the first coupling groove and the second coupling groove, wherein the insertion groove has an area of a lower end, which is larger than that of an upper end, and the bush unit has one side and the other side, which are asymmetrical based on the second coupling groove, and is separated into two or more.