Cryogenic Double-Pipe Bayonet Joint With Sliding Alignment
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Solution Overview
Problem
The bayonet joint in cryogenic piping faces difficulty in inserting the male bayonet into the female bayonet due to a small clearance and long insertion length, making it challenging to connect the double pipes effectively.
Innovation Solution
A joint structure with a slide mechanism and positioning members, such as rings with tapered surfaces, allows for easy alignment and insertion of the male bayonet into the female bayonet by sliding the positioning members, facilitating the connection between the double pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bayonet joint with small clearance is used to connect double pipes, then the thermal insulation performance is improved, but the ease of insertion deteriorates due to long insertion length
Solution Approach 1:
The positioning members (first positioning member on the first double pipe and second positioning member on the second double pipe) are pre-installed to establish axial alignment and concentricity between the male and female bayonets before insertion. This preliminary positioning action eliminates the need for difficult manual alignment during insertion, solving the contradiction between maintaining small clearance for thermal insulation and enabling easy insertion.
Solution Approach 2:
The slide mechanism acts as an intermediary device that facilitates the insertion process by providing guided movement along the axial direction. It mediates between the positioning members and the bayonet connection, enabling smooth insertion while maintaining the precise alignment required for small clearance, thus resolving the contradiction between thermal insulation performance and ease of operation.
2Object-affected harmful factors
If a long insertion length is used in the bayonet joint, then the thermal insulation performance is improved by reducing clearance, but the device complexity increases
Solution Approach 1:
The connection system is segmented into distinct functional components: positioning members for alignment, slide mechanism for guided movement, and bayonet flanges for final connection. This segmentation allows each component to perform its specific function efficiently, reducing overall system complexity while maintaining the long insertion length required for thermal insulation.
Solution Approach 2:
The slide mechanism introduces dynamic capability to the connection system, allowing the second double pipe to be slid axially for insertion and then positioned. This dynamic approach simplifies the insertion process compared to static alignment methods, reducing device complexity while enabling the long insertion length needed for reducing clearance and improving thermal insulation.
Data Source
AI summary
A joint structure connecting a first and second double pipe, includes a male bayonet at an end portion of one of the pipes, the male bayonet including a first flange; a female bayonet at an end portion of the other of the pipes, the female bayonet including a second flange fastened to the first; a first positioning member mounted on the first double pipe; a second positioning member mounted on the second double pipe, the second positioning member being positioned with respect to the first so that a center axis of the male bayonet and the female bayonet conform to each other; and a slide mechanism which supports the first positioning member so the first positioning member is slidable in an axial direction of the first double pipe or supports the second positioning member so the second positioning member is slidable in an axial direction of the second double pipe.