Threaded Tube Insert for Removable Quick-Connect Anchoring
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Solution Overview
Problem
Existing cartridge-type quick-connect devices for fluid transport circuits face difficulties in removing and replacing the insert due to anchoring irregularities that prevent easy extraction, especially when the sealing gasket is damaged or chemically incompatible, and hinder the sorting of end-of-life components.
Innovation Solution
The device employs a tubular insert with helical asperities forming external threads and a drive impression for rotation, allowing easy anchoring and extraction by rotating the insert around its longitudinal axis using a tool, featuring a profile with specific angles and optional grooves or splines for unscrewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If annular asperities with fir tree teeth profile are used for anchoring the insert in the housing, then the insert is effectively prevented from being ejected due to fluid pressure, but the insert becomes difficult or impossible to remove from the housing
Solution Approach 1:
The invention transforms the static anchoring asperities into dynamic threaded engagement. The helical thread profile allows the insert to be actively screwed into the housing, creating a progressive engagement that maintains strong anchoring while enabling controlled removal through reverse rotation, thus resolving the contradiction between secure anchoring and ease of removal
Solution Approach 2:
The invention applies a helical (curved) thread profile to the asperities instead of straight radial teeth. This curved geometry enables rotational movement during installation and removal, transforming the interaction from purely axial force resistance to a combination of rotational and axial motion, thereby allowing easy removal while maintaining secure anchoring
2Strength
If the insert is firmly anchored using irregularities that bite into the housing surface, then the connection is secure, but the sealing gasket may be damaged during insertion or become chemically incompatible
Solution Approach 1:
The invention performs preliminary threading of the insert into the housing before final sealing engagement. The helical thread guides the insert progressively into position, preventing sudden impact forces that could damage the sealing gasket, while still achieving strong anchoring through the threaded engagement
3Reliability
If the insert cannot be removed from the housing, then the anchoring is secure, but selective sorting of end-of-life components becomes impossible
Solution Approach 1:
The threaded engagement design allows the insert to transition between a securely anchored state (when screwed in) and a easily removable state (when unscrewed). This dynamic capability enables selective sorting of end-of-life components by allowing technicians to remove inserts for inspection, recycling, or replacement while maintaining secure anchoring during normal operation
Data Source
Figure 1~2
Figure 3~4
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AI summary
The invention relates to a connection device (1) for a tube (100) in the form of a cartridge insertable into a cylindrical housing (201) of a circuit element (200), comprising a tubular insert (2) having externally a means for anchoring the insert in the housing and internally means for retaining an end portion of the tube in the insert. According to the invention, the anchoring means consists of at least one helical asperity (3.2) forming an external thread for the insert to be forcefully engaged and anchored in the housing, and the insert has at least one recess (3.3, 3.3', 3.3", 3.3''') for rotating the insert about its longitudinal axis.