Shielded Heating Pad Structure for Low-EM Radiation and Uniform Heat
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Solution Overview
Problem
Existing heating pads generate electromagnetic radiation due to heating wires, posing health risks and are heavy and costly when shielded with metal materials, compromising comfort and usability.
Innovation Solution
A radiation-free heating pad design featuring serpentine heating wires, aluminum foil shielding, a flexible shielding layer, and a reinforcement layer, with grid-patterned resilient ribs, to create a Faraday cage effect and uniform heat distribution, while maintaining flexibility and reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal plates or metal meshes are used for electromagnetic shielding, then electromagnetic radiation shielding effect is improved, but weight and rigidity significantly increase, severely affecting use comfort
Solution Approach 1:
The patent uses flexible shielding materials including conductive cloth, anti-magnetic cloth, or RFID shielding fabric instead of rigid metal plates or meshes. These flexible materials can be integrated into the heating pad structure while maintaining electromagnetic shielding effectiveness and preserving the flexibility and comfort of the heating pad for user wear.
Solution Approach 2:
The patent employs composite material structures combining flexible shielding layers with other functional layers (heating wire layer, insulation layer, etc.) to achieve both electromagnetic shielding and mechanical flexibility. The composite structure allows the heating pad to maintain shielding effectiveness while remaining lightweight and comfortable for extended wear.
2Object-affected harmful factors
If metal plates or metal meshes are used for electromagnetic shielding, then electromagnetic radiation shielding effect is improved, but cost increases significantly, limiting widespread adoption
Solution Approach 1:
The patent adopts cost-effective flexible shielding materials such as conductive cloth or anti-magnetic cloth that are significantly cheaper than metal plates or meshes. These materials can be manufactured and integrated into heating pads at lower costs, making the product more affordable and suitable for widespread adoption in everyday applications.
Solution Approach 2:
The patent changes the material parameters from expensive metal-based shielding to more economical textile-based shielding materials. By selecting appropriate flexible shielding materials with suitable electromagnetic shielding properties, the patent achieves cost reduction while maintaining adequate shielding effectiveness for the intended application.
3Temperature
If heating wire is arranged in serpentine pattern on fiber layer, then heat distribution uniformity is improved, but electromagnetic radiation generation remains significant
Solution Approach 1:
The patent introduces flexible shielding materials (conductive cloth, anti-magnetic cloth, or RFID shielding fabric) as intermediary layers between the heating wire and the user's body. These shielding layers act as mediators that block or attenuate electromagnetic radiation from the heating wire while allowing heat to pass through, thus maintaining uniform heat distribution while reducing electromagnetic exposure.
Solution Approach 2:
The patent employs a nested layered structure where the heating wire is embedded within or adjacent to the flexible shielding layer. The shielding layer is integrated into the multi-layer construction of the heating pad, with the heating wire layer positioned between shielding layers or in close proximity, creating a nested configuration that provides continuous electromagnetic protection while maintaining thermal performance.
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
Effectively shields electromagnetic radiation, prevents localized overheating, enhances comfort with uniform heat distribution, and prolongs the heating pad's service life through improved tensile resistance and reduced friction.
Implementation Method 1
utilizing the Faraday cage effect to counteract electromagnetic fields
Implementation Method 2
generating heat by passing an electric current through the heating wire
Data Source
AI summary
A radiation-free heating pad and a processing technology thereof is provided. The radiation-free heating pad includes heating wires, a fiber layer, a flexible shielding layer, and a reinforcement layer. The heating wires are uniformly arranged on the fiber layer in a serpentine pattern, a layer of aluminum foil is arranged on each of an upper side and a lower side of the fiber layer, and the aluminum foil tightly wraps the heating wire. The flexible shielding layer is arranged outside the aluminum foil, and the reinforcement layer is arranged outside the flexible shielding layer. The radiation-free heating pad is based on the Faraday cage effect, and an electromagnetic field generated when an electric current passes through the heating wire can be effectively counteracted by a double shielding structure composed of the aluminum foil and the flexible shielding layer.