Composite Tube Connection Nipple Chamfering Stop
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Solution Overview
Problem
Existing connection devices for plastic pipes risk impermissible displacement of the sealing ring during connection, leading to compromised sealing, especially when the pipe's end face is not chamfered, making it difficult to recognize the correct connection position.
Innovation Solution
Incorporating a chamfer on both the inner and outer diameters of the connection end of the plastic pipe, along with radially inwardly projecting stops on the clamping sleeve that can be displaced radially outward via the outer chamfer, ensuring proper sealing and preventing the sealing ring's displacement by engaging with the pipe's chamfered surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the connection end of the plastic pipe is pushed onto the connection nipple without proper chamfering, then the connection process is simpler, but the sealing ring may be forced out of its peripheral groove compromising the sealing
Solution Approach 1:
The connection end of the plastic pipe is pre-chamfered on both the inner and outer diameters before insertion. This preliminary preparation ensures that the outer chamfer can properly engage with and displace the stop radially outward, creating a reliable sealing surface and preventing the sealing ring from being forced out of its groove during connection.
Solution Approach 2:
The stop is designed to protrude radially inward into the connection end of the pipe before insertion, creating a preliminary barrier. This stop prevents improper insertion and protects the sealing ring from displacement. The outer chamfer is specifically designed to engage with this stop and displace it radially outward, neutralizing its barrier function in a controlled manner that ensures proper connection.
2Reliability
If a stop is provided on the clamping sleeve to prevent further pushing of the connection end, then the connection position is secured, but the stop must be displaced radially outward which requires additional force and complexity
Solution Approach 1:
The stop is designed as a dynamic element that can be displaced radially outward from its initial protruding position. During connection, the outer chamfer of the pipe engages with the stop and displaces it radially outward, allowing the connection end to advance. Once the connection is complete, the stop returns to its protruding position to prevent further pushing, providing a simple yet effective mechanism for securing the connection position without complex locking systems.
Solution Approach 2:
The stop changes its radial position parameter during the connection process. Initially, it protrudes radially inward to block the connection end. Upon engagement with the outer chamfer, it is displaced radially outward, changing its position parameter to allow connection advancement. This parameter change enables the stop to transition between its barrier function and its clearance state, simplifying the overall mechanism while maintaining reliability.
3Reliability
If the stop is displaced radially outward via the outer chamfer, then the insertion path is released and proper sealing is ensured, but the outer chamfer adds manufacturing steps and complexity
Solution Approach 1:
The inner and outer chamfers are combined into a single integrated feature on the connection end of the pipe. The inner chamfer prepares the sealing surface by removing burrs and creating a tapered edge, while the outer chamfer engages with the stop to displace it radially outward. By merging these two chamfering operations into one coordinated feature, the design ensures proper sealing and stop displacement without requiring separate complex manufacturing steps, maintaining ease of manufacture while achieving reliable sealing.
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 solution ensures secure axial advancement and correct positioning of the plastic pipe, preventing sealing ring displacement and facilitating a visible indicator for proper connection, thus maintaining a reliable seal and preventing misconnection.
Implementation Method 1
the stop is provided on a spring-loaded retaining ring which encloses the clamping sleeve and is open on the peripheral side and passes through an opening in the clamping sleeve, so that the stop is displaced radially outwards through the clamping sleeve opening, with the spring-loaded widening of the retaining ring
Implementation Method 2
the sealing ring is pressed into the circumferential groove with elastic deformation when the plastic pipe is pushed onto the connection nipple
Data Source
Figure 1~3
AI summary
The device has a frontal chamfering (9) axially provided between a connection nipple (1) and a clamping sleeve (4). A terminal end (3) of a plastic pipe (2) is overlapped. A seal ring (5) is provided in a profiled connection fitting. The clamping sleeve is radially protruded in an inward direction in a region of inner and outer diameters of the terminal end by the frontal chamfering. A stop part (10) is radially displaced in an outward direction and arranged in an insertion direction in front of the seal ring.