Screw Connection Device for Flared Pipe Ends
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Solution Overview
Problem
Screw connection devices for connecting flared pipe ends often suffer from damage during assembly, leading to compromised fluid tightness, and require additional production steps to secure spacers, increasing costs.
Innovation Solution
A screw connection device comprising a screw, nut, and spacer, where the nut has a threaded section and a thread-free section, allowing the spacer to be pre-installed without contact pressure, ensuring reliable installation and preventing flare collapse during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flares are pressed hard against one another to create a fluid tight connection, then the fluid tightness is improved, but the flares can be damaged and fluid tightness can no longer be guaranteed
Solution Approach 1:
The patent introduces a spacer as an intermediary element between the two flared pipe ends. The spacer is held in the accommodating space by the thread profile of the internal thread, which extends into the accommodating space. This mediator allows the flares to be pressed together to achieve fluid tightness while preventing direct damage between the flares, as the spacer absorbs and distributes the contact pressure force.
2Object-affected harmful factors
If a spacer or spacer ring is arranged between the flares to prevent damage, then flare damage is prevented, but additional production steps are required to secure the spacer in a housing
Solution Approach 1:
The patent combines the spacer securing function with the existing internal thread structure of the nut. The thread profile of the internal thread extends into the accommodating space to directly hold the spacer, merging the spacer retention function into the existing threading mechanism. This eliminates the need for separate securing steps or additional housing features, as the spacer is automatically retained by the extended thread profile during normal assembly.
3Reliability
If the spacer is secured in a housing to prevent falling out, then reliable installation is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the spacer securing function from the housing structure and transfers it to the thread profile of the internal thread. By extending the thread profile into the accommodating space, the housing no longer needs special securing features, as the thread itself provides the retention mechanism. This simplifies the housing structure while maintaining reliable spacer positioning.
Data Source
AI summary
A screw connection device for connecting two pipes with flared ends, comprises a screw, a nut and a spacer. The nut has a front end aperture from which an accommodating space extends to a rear end aperture in a rear end wall. A surface of the nut in the accommodating space has a threaded section which extends toward the rear end wall which has a flange face in the accommodating space. In a pre-installed state, the spacer and a first pipe end with a first flare are accommodated in the nut, such that the spacer is held undetachable between the first flare and the internal thread. A second pipe end with a second flare can be held in the accommodating space by the screw, threaded into the nut such that the second flare is pressed against a sealing surface of the spacer and the spacer is pressed with a further sealing surface against the first flare.