Pipe Joint Insertion with Conical Expansion to Prevent Cracking
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Solution Overview
Problem
Existing pipe fitting connection methods often result in pipe cracking due to uneven force expansion, water leakage, and complex operations, with inefficiencies in connection time and reliability.
Innovation Solution
A pipe fitting connecting method using an elastic sleeve and a connecting pipe body with a conical ring expansion section, where the pipe and sleeve are gradually expanded and then retracted to ensure a tight, uniform connection without external expanders or sealing rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a multi-chip expander is used to expand the pipe inner hole, then the pipe port can be enlarged to accommodate the connecting pipe body, but the pipe is likely to be cracked due to uneven force distribution
Solution Approach 1:
The expanding action is segmented into multiple progressive stages through the conical ring structure, which has a small front end and large rear end. As the inserting part is pushed into the pipe, the conical ring progressively expands the pipe wall from front to rear, distributing the expansion force along the pipe length rather than applying it all at once, thereby preventing cracking.
Solution Approach 2:
The expanding mechanism transitions from a static multi-chip expander to a dynamic progressive expansion process. The conical ring creates a moving expansion front that travels along the pipe as the inserting part is inserted, allowing the pipe material to gradually adapt to the expansion stress, reducing the risk of sudden failure or cracking.
2Ease of manufacture
If both an expander and a pushing tool are used for connection, then the pipe can be expanded and the connecting pipe body inserted, but the operation becomes complex
Solution Approach 1:
The functions of the expander and pushing tool are merged into a single integrating structure. The inserting part of the connecting pipe body serves both as the element to be inserted and as the expanding tool itself. The conical ring on the inserting part performs the expansion function while the pushing tool simply provides the insertion force, eliminating the need for a separate multi-chip expander device.
Solution Approach 2:
The inserting part of the connecting pipe body achieves multi-functionality: it serves as both the connection element and the expansion tool. The conical ring structure enables the same component to perform both insertion and expansion functions, simplifying the overall connection process and reducing the number of specialized tools required.
3Volume of moving object
If the pipe inner hole is expanded by a large amount to accommodate the elastic sleeve, then the connecting pipe body can be inserted, but the pipe becomes more prone to cracking due to uneven force and excessive expansion
Solution Approach 1:
The large expansion amount is segmented into small incremental expansions along the pipe length. The conical ring structure distributes the expansion across multiple small stages as the inserting part is progressively inserted, preventing the concentration of large expansion forces at any single location, thereby maintaining pipe reliability.
4Volume of moving object
If a multi-chip expander is used to expand both the pipe and elastic sleeve, then the inner diameters can be increased for insertion, but deep indentations are formed on the inner surface causing water leakage
Solution Approach 1:
The expansion process transitions from a static multi-chip expander application to a dynamic progressive expansion. The conical ring creates a moving expansion front that gradually enlarges the pipe bore while maintaining more uniform stress distribution, reducing the formation of deep indentations and improving inner surface smoothness compared to traditional multi-chip expanders.
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
This method effectively prevents pipe cracking, enhances sealing performance, simplifies the connection process, and ensures high reliability with a single-step operation, reducing the risk of leakage and damage.
Implementation Method 1
an elastic sleeve is sleeved on a pipe at a port of the pipe... the pipe and the elastic sleeve are gradually expanded along the conical ring of the expansion section, and when the inserting part is inserted in place, the pipe and the elastic sleeve retracts so that the pipe is tightly connected to the connecting pipe body
Data Source
Figure 1~2
AI summary
A pipe fitting connecting method and a connecting structure, comprising the following steps of: providing an elastic sleeve (10) at the position of an end opening of a pipe material (20) in a sleeving manner, and clamping the pipe material by means of a clamping sleeve (01) of a push tool; fixing a connecting pipe body (30) to a clamping ring (02) of the push tool, the front end of an insertion end (310) of the connecting pipe body being a guiding-in section (312), the rear end of the insertion section of the connecting pipe body being an expansion section (314), the outer diameter of the guiding-in section being equal to the inner diameter of the pipe material, and a conical ring (316) with a small front end and a large rear end being provided on the periphery of the expansion section; and enabling the insertion end of the connecting pipe body (30) to be forcefully inserted into the pipe material, the pipe material and the elastic sleeve (10) being gradually expanded along the conical ring (316) of the expansion section, and when the insertion end (310) is inserted in place, the pipe material and the elastic sleeve retracting, so as to enable the pipe material (20) and the connecting pipe body (30) to be tightly connected. Without an expansion tool, expansion is conducted directly by means of the insertion end of the connecting pipe body, thereby saving a large amount of working time; the pipe material and the elastic sleeve are evenly expanded in a whole circumference manner, thereby effectively avoiding pipe material damage caused by excessive expansion.