Elastomer Pipe Connection Insert for Leak-Tight Threaded Sealing
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Solution Overview
Problem
Existing connecting devices with elastomer inserts and connecting pieces often suffer from insufficient fluid tightness due to leaks between the external and internal threads, leading to undesirable fluid penetration or escape.
Innovation Solution
A connecting device design where the elastomer insert and connecting piece are configured such that the connecting piece is screwed in to displace the elastomer insert's end section, compressing it radially and pressing it against the central part and reveal surface, enhancing fluid tightness, and optionally featuring markings and sealing elements for improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting piece is screwed into the elastomer insert using conventional methods, then the connection can be assembled, but fluid leaks occur between the external thread and internal thread
Solution Approach 1:
The elastomer insert is pre-compressed axially before the threading operation begins. This preliminary compression ensures that the elastomer is already under radial tension, creating a seal between the threads before fluid pressure can exploit any gaps. The pre-compression is maintained throughout the screwing process to prevent leakage.
Solution Approach 2:
The patent changes the stress state parameters of the elastomer insert by applying axial compression force during the threading operation. This parameter change transforms the elastomer from a relaxed state to a compressed state, generating radial tension that seals the thread interface and prevents fluid leakage.
2Reliability
If the elastomer insert is compressed radially to improve sealing, then fluid tightness increases, but the end section may be displaced in the direction of the receiving section
Solution Approach 1:
A positioning element is provided that engages with the connecting piece at a predetermined position. This preliminary positioning action prevents the end section from being displaced axially during the compression and threading operations, maintaining positional stability while still allowing radial compression for sealing.
Solution Approach 2:
The positioning element acts as a counteracting mechanism that balances the axial displacement force generated by radial compression. It provides a counter-force that prevents the end section from moving in the direction of the receiving section, thereby maintaining the elastomer insert's positional stability.
3Stability of the object's composition
If a positioning element is added to prevent displacement, then position stability is maintained, but the device complexity increases
Solution Approach 1:
The positioning element is designed to serve multiple functions: it positions the end section axially, prevents displacement during compression, and may also serve as a stop or reference feature for the threading operation. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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 design significantly improves fluid tightness by generating radial tension in the elastomer insert, preventing fluid migration and ensuring a secure, leak-proof connection.
Implementation Method 1
the end section of the elastomer insert is compressed, so that a radial tension is generated, which presses the elastomer insert at least in sections, but in particular its end section, against the central part of the connecting piece and against the reveal surface
Implementation Method 2
a relatively soft elastomer insert
Data Source
Figure 1~2
Figure 3a~3c
Figure 4a~4c
AI summary
The present invention relates to a connection device (100) for a secondary pipeline in combination with a transverse opening in a main pipeline, in a shaft or in a wall, comprising a hollow plug-shaped, relatively soft elastomer insert (10), the outer surface (11) of which is adapted to the transverse opening, and the inner surface (12) of which has a screw area (13) into which a connection fitting (20) can be screwed, and a relatively harder connection fitting (20) comprising an engagement end (21), a central part (22) with external thread (23), a receiving section (24) and a drive end (25), characterized in that the inner surface (12) of the elastomer insert (10) and the outer surface (26) of the central part (22) of the connection fitting (20) are each designed as cylindrical shell surfaces, such that the connection fitting (20) can be screwed into the elastomer insert (10).wherein, with the connection device (100) mounted, the connection spigot (20) is first screwed into the elastomer insert (10) to a first screw-in position (31) without the end section (14) of the elastomer insert (10) being displaced towards the receiving section (24) of the connection spigot (20), and subsequently the connection spigot (20) is screwed into the elastomer insert (10) to a second screw-in position (32), whereby the end section (14) of the elastomer insert (10) is displaced towards the receiving section (24) of the connection spigot (20), so that the elastomer insert (10) is pressed at least partially against the central part (22) of the connection spigot (20) and against the reveal surface (40) of the transverse opening in the main pipeline, in the shaft or in the wall.