Sheet-Metal Blower Housing for Lower-Cost Linen Dryers
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Solution Overview
Problem
Existing linen drying devices face high costs and material inefficiencies due to the use of aluminum die-casting for fan housings, which results in excessive weight and heat dispersion, and alternative plastic solutions are prone to breaking under strain.
Innovation Solution
A centrifugal blowing unit with a casing made from thin steel sheet metal semi-shells connected by seaming, eliminating the need for die-casting and providing a lightweight yet robust structure with reduced heat dissipation, and using a seaming method that avoids the need for additional gaskets and threaded connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aluminum die-casting is used for the fan housing, then the housing has sufficient strength, but the cost increases substantially and material usage increases
Solution Approach 1:
The patent changes the material parameters by transitioning from aluminum die-casting to thin steel sheet metal, fundamentally altering the manufacturing approach while maintaining structural integrity through different structural configurations
Solution Approach 2:
The patent employs thin steel sheet metal (thin film) to construct the fan housing semi-shells, replacing traditional thick aluminum die-cast parts. This thin-shell approach reduces material consumption and manufacturing cost while maintaining sufficient strength through optimized structural design and seaming connections
2Strength
If aluminum die-casting is used for the fan housing, then the housing has sufficient strength, but the weight increases
Solution Approach 1:
The patent uses thin steel sheet metal to create lightweight semi-shell structures that replace heavy aluminum die-cast housings. The thin-shell construction inherently reduces weight while maintaining structural integrity through the seaming connection method
Solution Approach 2:
The housing is divided into two semi-shells that are connected via seaming. This segmentation allows for optimized material distribution and weight reduction, as each semi-shell can be independently formed from thin metal sheets and joined efficiently
3Strength
If aluminum is used for the fan housing, then the housing has sufficient strength, but heat dispersion increases substantially
Solution Approach 1:
The patent changes the thermal parameters by substituting aluminum with steel material, which has different thermal conductivity properties. Steel generally has lower thermal conductivity than aluminum, thereby reducing unwanted heat dispersion from the motor and fan assembly
4Ease of manufacture
If plastic is used for the fan housing, then the manufacturing cost decreases, but the housing becomes weak and breaks easily
Solution Approach 1:
The patent changes the material parameters by selecting thin steel sheet metal instead of plastic, achieving an optimal balance between cost-effectiveness and mechanical strength. The metal material provides superior strength-to-cost ratio compared to plastic alternatives
5Strength
If threaded connection means are used to join semi-shells, then the assembly is strong, but the manufacturing complexity and cost increase
Solution Approach 1:
The seaming process creates self-supporting joints between the two semi-shells through interlocking folded edges. The connection structure is self-containing and does not require additional fasteners, gaskets, or threaded components, thereby simplifying the assembly process while maintaining structural integrity
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 solution reduces assembly costs, conserves material, and enhances structural integrity and heat management, resulting in a more cost-effective and efficient drying device.
Implementation Method 1
a condenser that causes the condensation of the moisture contained in the air extracted from the compartment (such moisture is transferred to the air by the linen whilst it is drying)
Implementation Method 2
an element that heats the air before reintroducing it into the compartment
Implementation Method 3
a fan that moves the air along the recirculation line
Data Source
Figure 1
Figure 2a~2d
Figure 3~4
AI summary
A linen drying device comprising: i) a drum (2) that can rotate and is intended to house the linen to be dried and/or washed; ii) a housing compartment (3) of the drum (2); iii) a condenser (4) that receives a gaseous fluid containing particles of vapour from said compartment (3) and that causes at least partial condensation thereof; iv) a blowing unit (5) in turn comprising: -a movement impeller (51) of the gaseous fluid; -a casing (52) that houses the impeller (51), is placed in fluid communication with the condenser (4) and is downstream of the condenser (4) along the outflow direction of the gaseous fluid, said casing (52) comprising a first and a second semi-shell (53, 54). The condenser (4) and the blowing unit (5) are placed along a line (7) that takes said gaseous fluid out of the compartment (3) and reintroduces it into the compartment (3). The first and the second semi-shell (53, 54) are made of sheet metal and are connected to each other through a seaming (9).