Vacuum Duct Screw Joint Assembly for Charged Particle Accelerators
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Solution Overview
Problem
Conventional charged particle accelerators require extensive assembly work due to the need for disassembling and reassembling duct components with flanges, which increases labor and complexity in both factory and site installations.
Innovation Solution
The use of a joint member with a male screw, an annular seal, a ring member, and a nut member that allow for easy assembly of vacuum duct components without the need for disassembly of devices like electromagnets or welding, enabling the formation of a sealed vacuum duct by screwing the joint and nut components together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flange bodies are welded to duct components, then the vacuum duct can be assembled, but the assembly work becomes complex and time-consuming
Solution Approach 1:
The joint member is divided into multiple functional segments: a connection portion that couples to the duct component, a screw portion with external threads, and a nut portion with internal threads. This segmentation allows the assembly process to be simplified from welding to a mechanical screwing operation, where the nut is screwed onto the screw portion to secure the joint, eliminating the need for welding while maintaining connection reliability.
Solution Approach 2:
The joint member acts as an intermediary component between duct components. Instead of directly welding duct components together, the joint member mediates the connection through its screw and nut mechanism. This intermediary approach enables easy assembly and disassembly without welding, solving the contradiction between reliable connection and assembly time.
2Strength
If welding is used to connect duct components, then strong joints are achieved, but the assembly process becomes complex
Solution Approach 1:
The welding process (thermal/chemical joining) is replaced with a mechanical screwing system. The screw portion with external threads engages with the nut portion containing internal threads, creating a strong mechanical joint. This substitution eliminates the complexity of welding operations (positioning, heating, cooling, quality control) while maintaining joint strength through the threaded mechanical connection.
Solution Approach 2:
The connection method changes from a permanent thermal process (welding) to a reversible mechanical process (screwing). The joint strength is maintained through proper thread design and material selection, while the complexity is reduced by eliminating welding equipment, procedures, and quality assurance steps. The parameter change from thermal to mechanical joining resolves the contradiction.
3Ease of manufacture
If equipment is disassembled and reassembled for duct installation, then duct components can be installed, but labor requirements increase
Solution Approach 1:
The joint member is pre-assembled with the duct component at the factory before shipping. The connection portion is already coupled to the duct, and the nut is attached or positioned. This preliminary action eliminates the need for on-site disassembly and reassembly of equipment. During installation, only the simple operation of screwing the nut onto the screw portion is required, significantly improving productivity while maintaining ease of installation.
Data Source
AI summary
A charged particle accelerator and a method for building the same includes in a vacuum-duct joint-portion, a male screw 21 engraved on an outer peripheral surface of a joint, a contact surface 25 to be brought into contact with an annular seal 12 is formed at the end of the inner peripheral surface 22 of the joint, a pressing surface 26 for pressing the annular seal 12 toward the contact surface 25 of the joint 11A is formed on the ring, an abutting surface 28 that abuts on the ring 15 is formed on the nut, and a female screw 27 to be screwed to the male screw 21 of the joint 11A is engraved on the inner peripheral surface of the nut 16.