Plastic Rear Bulkhead Assembly for Heat-Pump Laundry Dryers
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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 rear wall comprising a plastic supporting bulkhead and plastic components such as a centrifugal impeller scroll and drum supporting rollers, simplifying the structure and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal components and multi-part construction are used in the rear wall, then structural strength and reliability are improved, but device complexity and production costs increase
Solution Approach 1:
The patent integrates multiple separate components (rear wall panel, impeller scroll, and roller support bosses) into a single molded plastic piece. This merging eliminates the need for separate metal components and multiple assembly steps, reducing device complexity while maintaining structural integrity through the unified design of the plastic component.
Solution Approach 2:
The patent employs plastic material to replace traditional metal components in the rear wall assembly. This material substitution reduces complexity and production costs while the molded structure provides sufficient strength for supporting the drum and housing the impeller, demonstrating effective use of composite materials to resolve the contradiction between strength and complexity.
2Manufacturing precision
If multiple separate components are used in the rear wall assembly, then manufacturing precision and reliability are improved, but ease of manufacture and assembly simplicity worsen
Solution Approach 1:
The rear wall panel, impeller scroll, and roller support bosses are combined into a single molded plastic component. This integration simplifies manufacturing by requiring only one molding process instead of multiple separate component productions and subsequent assembly operations, significantly improving ease of manufacture while maintaining precision through mold-based fabrication.
Solution Approach 2:
The integrated plastic component includes self-contained features such as integrated roller support bosses and impeller scroll housing that require no additional assembly steps. The design serves itself by incorporating all necessary structural and functional elements within a single manufacturable unit, reducing assembly complexity and improving ease of manufacture.
3Reliability
If traditional multi-component rear wall design is used, then reliability is improved, but production costs and assembly complexity increase
Solution Approach 1:
The patent combines the rear wall panel, impeller scroll, and roller support structures into a single integrated plastic component. This merging reduces the number of parts and assembly operations required, decreasing assembly complexity while maintaining reliability through the unified structural design that eliminates potential failure points from multiple connection interfaces.
Solution Approach 2:
The use of molded plastic material provides sufficient reliability for the rear wall assembly while reducing complexity. The material's inherent properties and molded construction create a reliable, integrated structure that eliminates the need for complex metal fastening and joining systems, thereby reducing assembly complexity without compromising reliability.
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 drying performance using a heat-pump system that recirculates and dehumidifies air for efficient laundry drying.
Implementation Method 1
a heat-pump system that recirculates and dehumidifies air for efficient laundry drying
Implementation Method 2
at least a portion of a centrifugal impeller scroll made also of plastic material being carried out in one piece with said supporting bulkhead
Data Source
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AI summary
A rotary-drum laundry dryer (1) comprising a rotatable 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 rotatable 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 rotatable drum (3) and over the laundry inside the rotatable 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. At least a portion (142) of a centrifugal impeller scroll (150) is made also of plastic material and is carried out in one piece with the supporting bulkhead (14a). Furthermore, at least one supporting boss (155) of a drum supporting roller (8) can be also made of plastic material and carried out in one piece with the supporting bulkhead (14a).