Pipe Joint With Heat Transmission Suppressing Member
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Solution Overview
Problem
Existing pipe joints face issues with increased size due to complex heat transmission suppression methods, difficulty in descaling, and limited design freedom, which can lead to reduced yield in semiconductor fabrication due to particle contamination from weld scale.
Innovation Solution
A pipe joint design featuring a first and second member with cylindrical end portions, a fluid flow passage, and a heat transmission suppressing member to prevent heat transfer during welding, allowing for efficient sealing and reduced size, along with a method of forming such joints using transverse contraction welds and annular sealed areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plate-like metal sealing member is used to seal the pipe joint, then sealing performance is improved, but the diametrical size of the pipe joint increases
Solution Approach 1:
The patent uses a thin film-like metal sealing member that is bent into a U-shape configuration. This thin film structure provides effective sealing contact between pipe members while occupying minimal radial space, thus maintaining high sealing performance without increasing the diametrical size of the pipe joint.
2Temperature
If a complex L-shaped or zigzag cross-section space is provided to suppress heat transmission, then heat transmission from weld to sealing area is reduced, but the diametrical size increases further
Solution Approach 1:
The patent introduces a heat transmission suppressing member as an intermediary component positioned between the weld area and the sealing area. This mediator blocks thermal conduction paths from the weld to the sealing region, protecting the sealing member from heat damage without requiring complex spatial configurations.
Solution Approach 2:
The heat transmission suppressing member is designed as a thin-walled cylindrical structure that fits within the pipe joint assembly. This thin film-like structure effectively interrupts heat transmission while occupying minimal space, avoiding the need for large L-shaped or zigzag cross-section spaces.
3Temperature
If the weld inner side faces a narrow L-shaped space, then heat transmission is suppressed, but descaling operation becomes difficult
Solution Approach 1:
The heat transmission suppressing member serves as a mediator that blocks heat while maintaining an open, accessible geometry. Its cylindrical design with open ends allows descaling tools and operators to access the weld inner side easily, eliminating the accessibility problems caused by narrow L-shaped spaces.
4Object-generated harmful factors
If inert gas spraying is used to prevent scale formation, then scale prevention is improved, but sealing and gas replacement operation is required which reduces efficiency
Solution Approach 1:
The patent extracts the heat source from the sealing area by positioning the heat transmission suppressing member between them. This separates the welding process from the sealing member protection, eliminating the need for inert gas spraying and associated sealing/gas replacement operations, thereby improving production efficiency.
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 solution enables high sealing performance, reduced size, efficient production, and greater design freedom while preventing particle contamination, enhancing reliability and yield in semiconductor fabrication.
Implementation Method 1
a weld experiencing transverse contraction and joining together the first and the second outer cylindrical end portions
Implementation Method 2
a heat transmission suppressing member arranged in a space delimited by a weld forming area and a to-be-sealed area, inside the first and second members assembled, to suppress transmission of heat applied in welding from the weld forming area to the to-be-sealed area
Data Source
AI summary
A pipe joint includes a first member, a second member, a weld experiencing transverse contraction and joining a first outer cylindrical end portion and a second outer cylindrical end portion butted with their end faces meeting over the entire circumference, an annular sealed area produced by the transverse contraction of the weld causing a first pressing portion and a second pressing portion to be displaced toward each other, a heat transmission suppressing member arranged in a space delimited by a weld forming area and a to-be-sealed area, inside the first and second members assembled, to suppress transmission of heat applied in welding from the weld forming area to a to-be-sealed area, and a first stop ring fitted in an outer cylindrical surface of the heat transmission suppressing member to hold the heat transmission suppressing member against an inner surface of the first or the second member.