Composite Pipe Joint Structure for Watertight Corrosion Resistance
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Solution Overview
Problem
Existing water pipes, particularly cast iron pipes, suffer from rust and scale issues that deteriorate water quality, and while stainless steel pipes offer better corrosion resistance, their high cost and limited use restrict their widespread adoption.
Innovation Solution
A composite pipe design that combines a stainless steel inner pipe with a steel outer pipe, featuring an anticorrosive resin layer and a short pipe portion with grooves or protrusions for secure watertight coupling, preventing separation and ensuring hydraulic integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cast iron pipes are used, then excellent physical properties against water pressure and water impact are achieved, but rust and scale generation cause deterioration in water quality
Solution Approach 1:
The invention uses a composite pipe structure combining cast iron outer pipe with stainless steel inner pipe. The cast iron outer pipe provides excellent strength and pressure resistance, while the stainless steel inner pipe prevents rust and scale generation, thereby solving the contradiction between mechanical strength and corrosion resistance.
2Reliability
If stainless steel pipes are used, then excellent corrosion resistance and good water taste are achieved, but high price and limited use restrict widespread adoption
Solution Approach 1:
The composite pipe structure allows using stainless steel only for the inner pipe where corrosion resistance is critical, while the outer pipe can be made of less expensive cast iron. This reduces the overall cost compared to using full stainless steel pipes while maintaining excellent corrosion resistance where needed.
Solution Approach 2:
The invention applies different material qualities to different parts of the pipe system. The inner pipe contact area with water uses high-quality stainless steel for corrosion resistance, while the outer structural portion uses cost-effective cast iron, optimizing both performance and cost.
3Strength
If adhesive layer is used to couple stainless steel pipe and steel pipe, then firm coupling is achieved, but separation occurs at the end of the pipes
Solution Approach 1:
The invention divides the pipe into main portion and short pipe portion segments. The short pipe portion acts as a transition element with watertight welding at both ends, preventing separation at the junction between different pipe materials while maintaining the adhesive coupling in the main body.
Solution Approach 2:
The short pipe portion serves as an intermediary element between the stainless steel inner pipe and steel outer pipe. It provides watertight welding connections at both ends, acting as a mediator that prevents separation while allowing the adhesive layer to function in the main coupling area.
4Strength
If inner pipe is expanded to fit outer pipe, then firm coupling is achieved, but bent portion or step formation weakens the connection
Solution Approach 1:
The invention performs preliminary actions by forming grooves or protrusions on the short pipe portion before assembly. These features guide the inner pipe into proper alignment and prevent bent portions or steps during the expansion and coupling process, maintaining straight state and connection strength.
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 composite pipe achieves firm watertight coupling between the main and short pipe portions, preventing separation and ensuring reliable hydraulic performance, even under corrosion or pressure, while offering improved corrosion resistance and economic efficiency.
Implementation Method 1
one end of the short pipe portion is coupled to one end of the main portion by watertight welding
Implementation Method 2
an inner pipe of the main portion is welded to the inner surface of the short pipe portion
Implementation Method 3
an adhesive layer formed between the inner and outer pipes to couple the inner and outer pipes
Data Source
AI summary
The composite pipe according to the present invention is made by combining the main portion and the short pipe portion, and has the advantage that the inner pipe of the main portion can be firmly coupled to the inner surface of the short pipe portion without bending or stepping.