Thick-Walled Pipe Fitting With Reduced Pressing Area
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Solution Overview
Problem
Existing connections for thick-walled pipes are difficult to press due to high rigidity, requiring complex and expensive tools, and are prone to premature rusting, which shortens the service life and increases labor costs.
Innovation Solution
A fitting system with a reduced wall thickness in the pressing area and a segmented stop for the cutting ring, combined with a sealing element and a cutting element that digs into the pipe's outer wall for stability, allowing for easier pressing and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the wall thickness in the pressing area is reduced to facilitate pressing, then the pressing force required is decreased, but the fitting becomes more prone to corrosion and premature rusting
Solution Approach 1:
The fitting has non-uniform wall thickness with a reduced pressing area (thinner wall) for easier pressing and a contact area (thicker wall) for corrosion resistance. This local differentiation allows each area to optimize its function: the thinner pressing area reduces pressing force requirements while the thicker contact area maintains long-term corrosion resistance.
2Reliability
If threaded connectors are used instead of pressed connections, then the installation complexity increases and labor time increases, but the fitting wall thickness can be maintained
Solution Approach 1:
The fitting is pre-designed with a reduced wall thickness in the pressing area, which prepares the structure for easier pressing operations. This preliminary structural preparation enables quick pressed connections without requiring complex threading operations or extensive installation preparation, thereby reducing installation time while maintaining connection durability.
3Reliability
If the fitting wall thickness is increased to prevent rusting through, then the corrosion resistance is improved, but the pressing operation becomes more difficult and requires expensive tools
Solution Approach 1:
The fitting employs local quality differentiation by having different wall thicknesses in different areas: the contact area has sufficient wall thickness for corrosion resistance and long service life, while the pressing area has reduced wall thickness to facilitate pressing operations with simple, inexpensive tools. This resolves the contradiction by making the fitting locally optimized for each function.
4Reliability
If a continuous stop for the cutting ring is used, then the cutting ring is securely held, but the excess coating material accumulates and forms run-off lugs requiring additional processing
Solution Approach 1:
The stop for the cutting ring is segmented into discrete sections rather than being continuous. This segmentation allows excess coating material to drain through the gaps between segments during the coating process, preventing accumulation and run-off lugs. The segmented structure maintains cutting ring retention functionality while simplifying the coating manufacturing process.
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 system reduces the force required for pressing, prevents premature rusting, and ensures a stable connection that lasts longer, minimizing material costs and labor while maintaining tightness.
Implementation Method 1
a thick-walled pipe is radially expanded in a fitting area arranged at one end of the pipe
Implementation Method 2
a partial area of the fitting area arranged at the end of the pipe is radially stretched in such a way that the inner diameter of the partial area is larger than the outer diameter of the pipe and in which the partial area is radially stretched in such a way that the wall thickness of the pipe in the partial area is at least partially lower than in the part of the fitting area that is not in the partial area
Data Source
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AI summary
The invention relates to a fitting for thick-walled pipes, having a contact region (6) and having a compression region (8), wherein the compression region (8) is arranged on that side of the contact region (6) which faces the pipe insertion opening and wherein the wall thickness in the compression region (8) is smaller at least in certain portions than the wall thickness in the contact region.