Internal Infrared Heating for Thermoplastic Pipe Belling
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Solution Overview
Problem
Existing belling machines for thermoplastic pipes, particularly PP and HDPE, face inefficiencies in heating due to complex and costly multi-station configurations, with slow external contact heating methods that result in non-uniform temperature distribution and increased production time, especially for small diameter pipes.
Innovation Solution
An apparatus utilizing internal shortwave radiating elements, such as twin-type infrared lamps, integrated with a movement device to ensure uniform heating of the inner pipe surface, allowing for efficient and rapid heating by combining radiation and convection, reducing energy consumption and enabling multi-belling mode operations without increasing machine complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If external contact heating is used for thermoplastic pipes, then heating can be performed with simple apparatus, but heating speed is slow and temperature distribution is non-uniform
Solution Approach 1:
The patent inverts the conventional external heating approach by implementing internal heating. A heating element is inserted inside the pipe to be heated, allowing heat to be applied from the interior surface. This inversion enables rapid and uniform heating of the pipe wall from the inside out, solving the slowness and non-uniformity problems of external contact heating while maintaining apparatus simplicity.
Solution Approach 2:
The patent replaces the mechanical contact heating system with a radiant heating system. Instead of relying on thermal conduction through physical contact between heating elements and pipe exterior, the invention uses radiant energy (infrared or electromagnetic radiation) that can penetrate and heat the pipe material directly from the inside, achieving much faster heating rates and more uniform temperature distribution.
2Temperature
If multiple heating stations are used for uniform heating, then temperature distribution improves, but machine complexity and cost increase
Solution Approach 1:
By inverting the heating approach from external to internal, the patent achieves uniform temperature distribution with a single heating station. The internal heating element contacts the entire inner circumference of the pipe simultaneously, ensuring even heat distribution without requiring multiple stations arranged around the pipe exterior.
Solution Approach 2:
The patent merges the functions of multiple heating stations into a single internal heating element. Instead of having several external heating units that would need to be coordinated, the invention combines all heating functionality into one integrated internal element that uniformly heats the pipe from the inside, simplifying the machine structure while maintaining temperature uniformity.
3Device complexity
If external contact heating is used, then apparatus structure is simple, but production time increases
Solution Approach 1:
The patent inverts the heating direction from external to internal, placing the heating element inside the pipe. This enables direct heating of the pipe wall material from the inside surface, dramatically reducing the time required to reach the necessary temperature for forming operations while keeping the apparatus structure relatively simple.
Solution Approach 2:
The patent replaces slow thermal conduction-based mechanical contact heating with rapid radiant heating. The radiant energy system transfers heat much more quickly through the pipe material compared to external conduction, significantly reducing production time without complicating the apparatus structure.
4Productivity
If traditional heating methods are used for small diameter pipes, then heating can be performed, but temperature uniformity deteriorates
Solution Approach 1:
For small diameter pipes, the patent applies internal heating where the heating element is inserted inside the pipe. This ensures that heat is applied uniformly from the entire inner circumference simultaneously, achieving excellent temperature uniformity that is particularly critical for small diameter pipes where external heating would create significant temperature gradients across the thin wall.
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 apparatus achieves rapid, uniform, and energy-efficient heating of thermoplastic pipes, enhancing production capacity and reducing machine size and complexity, while maintaining precision and preventing overheating issues common in traditional systems.
Implementation Method 1
internal shortwave radiating elements, such as twin-type infrared lamps
Implementation Method 2
allowing for efficient and rapid heating by combining radiation and convection
Data Source
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AI summary
Described is an apparatus for internal heating of end portions (2a) of pipes (2) made of thermoplastic material having a central axis (A1) comprising a heating element (3), designed to be inserted at least partially inside an end portion (2a) of a pipe (2) made of thermoplastic material for heating an inner cylindrical surface (2c) of the portion (2a), the heating element (3) comprising an infra-red radiation unit (11) designed to face at least partially the inner cylindrical surface (2c).