Rotary-drum laundry dryer
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Solution Overview
Problem
Current rotary-drum home laundry dryers have complex structures that increase production costs and assembly complexity, particularly in the rear wall design.
Innovation Solution
A rotary-drum heat-pump laundry dryer with a plastic-made supporting bulkhead and lower socle, featuring a circular groove for a sealing gasket and plastic-made supporting bosses for rollers, simplifies the rear wall structure and reduces component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal rear wall and separate supporting bosses are used, then structural strength and durability are improved, but device complexity and production cost increase
Solution Approach 1:
The patent combines the rear wall and supporting bosses into a single integrated plastic bulkhead component. The bulkhead includes integrally formed supporting bosses that extend from the rear wall surface, eliminating the need for separate metal components. This merging reduces assembly steps and part count while maintaining structural integrity through the unified design.
Solution Approach 2:
The patent employs composite construction by integrating metal reinforcement elements within the plastic bulkhead structure. The supporting bosses are formed as integral parts of the plastic rear wall, creating a composite structure that combines the molding advantages of plastic with the strength requirements previously met by separate metal components.
2Ease of repair
If multiple separate components (rear wall, supporting bosses, sealing gasket) are used, then ease of repair and replacement are improved, but assembly complexity and production cost increase
Solution Approach 1:
The rear wall and supporting bosses are merged into a single molded plastic bulkhead piece. This integration eliminates multiple assembly operations involving screws, rivets, or other fastening methods, thereby simplifying the manufacturing process and reducing production costs while maintaining the ability to replace the entire bulkhead assembly if needed.
3Ease of manufacture
If plastic material is used for bulkhead and socle, then production cost is reduced, but structural strength and durability may worsen
Solution Approach 1:
The patent uses plastic material for the bulkhead and socle components, leveraging molding techniques to create structurally sound parts. The plastic material is formulated and designed to provide adequate strength and durability for the application, eliminating the need for metal components while reducing production cost and simplifying manufacturing.
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 design significantly reduces production costs and simplifies the assembly process while maintaining effective air sealing and drying performance using a heat-pump system.
Implementation Method 1
an open-circuit or closed-circuit, hot-air generator which is housed inside the casing and is structured to circulate inside the rotatable drum a stream of hot air
Implementation Method 2
a first circular sealing gasket is generally interposed between the front rim of the tubular body and the front wall of the casing, whereas a second circular sealing gasket is generally interposed between the rear rim of the tubular body and the rear wall of the appliance casing
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A rotary-drum laundry dryer (1) comprising a revolving drum (3) structured for housing the laundry to be dried, a hot-air generator (6) structured to supply a stream of hot air through the revolving drum (3), and a lower supporting base (11) which is structured for resting on the floor and for housing at least part of the hot-air generator (6). The hot-air generator (6) in turn comprises: - an air conduit; and - air circulating means which are located along the air conduit and are structured to produce, inside the air conduit, an airflow (f) which flows through the revolving drum (3) and over the laundry inside the drum (3). The rotary-drum laundry dryer (1) is characterized in that its rear wall (2b) comprises a supporting bulkhead (14a) made of plastic material; and the lower supporting basement or socle (11) is also made in plastic material.