Heater assembly
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Solution Overview
Problem
Conventional hairdryer heater assemblies experience uneven heating due to fixed wire diameter and support structures obstructing airflow, leading to overheating and reduced performance.
Innovation Solution
A heater assembly with multiple heater elements positioned in an air duct, where each element has a distinct electrical path defined between cut-outs in sheets, allowing for parallel circuit connections and varying voltages/currents to optimize heating and prevent overheating, with optional series connections for increased resistance and reduced wiring complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wire heater elements with fixed diameter are used, then manufacturing is simple, but all parts experience uniform electrical heating which causes downstream parts to overheat due to reduced cooling
Solution Approach 1:
The heater assembly is divided into multiple independent heater elements (first heater element, second heater element, third heater element) positioned at different locations in the air flow path. Each element can be controlled independently through separate circuit branches, allowing downstream elements to be managed separately from upstream elements to prevent overheating while maintaining manufacturing simplicity for each individual element.
Solution Approach 2:
Different heater elements are positioned at different locations in the air flow path with varying cross-sectional areas. Downstream heater elements have smaller cross-sectional areas to reduce electrical heating in regions where cooling is already reduced, creating local quality variations that prevent overheating while maintaining overall system reliability.
2Ease of operation
If mica supports are used to hold wire in air flow path, then wire is supported, but air flow is obstructed leading to uneven heating
Solution Approach 1:
The traditional mica support structures are removed from the design. Instead, the heater elements are formed from sheets with cut-outs that define the electrical paths, eliminating the need for separate support structures that would obstruct air flow and cause uneven heating, while still providing structural support for the heater elements.
Solution Approach 2:
The heater elements are constructed from thin sheet material with cut-outs defining the electrical paths. This thin film approach provides structural support without the bulk and obstruction of traditional mica supports, allowing uniform air flow across all heater elements for even heating while maintaining ease of positioning in the air flow path.
3Productivity
If multiple heater elements are added to improve heating, then heating effectiveness increases, but circuit complexity increases
Solution Approach 1:
The circuitry is designed with multiple circuit branches that can be connected in parallel, allowing the same circuit structure to support any number of heater elements. Each branch follows the same pattern, providing a universal solution that increases heating effectiveness through multiple elements while keeping circuit configuration simple and repeatable.
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 solution provides more even heating, reduces the risk of overheating, and allows for tailored power delivery to each heater element, enhancing the overall performance and reliability of the hairdryer.
Implementation Method 1
An electric current is passed through the wire, causing it to heat up and thus heat up air flowing over it
Data Source
AI summary
A heater assembly for a haircare appliance includes an air duct defining an air flow path extending from an upstream end to a downstream end; a first heater element positioned in the flow path, the first heater element having a first electrical path defined between cut-outs in a first sheet, the air flow path extending through said cut-outs; and a second heater element positioned in the flow path downstream of the first heater element, the second heater element having a second electrical path defined between cut-outs in a second sheet, the air flow path extending through said cut-outs. The heater assembly includes electrical circuitry for connection to a power source. The first and second electrical paths are provided in respective first and second circuit branches which are connected in electrical parallel within said circuitry.