Roller-Supported Dryer Drum With Rotating Back Wall
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Solution Overview
Problem
Existing laundry dryers face issues with wear and tear, energy losses, and complex construction due to friction between rotating laundry and stationary back walls, as well as suboptimal air flow and increased component count, leading to higher costs and energy consumption.
Innovation Solution
A laundry dryer design featuring a drum with a back wall that rotates as a single piece, supported by rollers, and plastic bulkheads that simplify the structure, reduce component count, and enhance air flow efficiency by using a heat pump system and integrated roller supports, minimizing friction and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a drum without a back wall is used with large diameter gaskets at the ends, then the drum can rotate freely, but the gaskets wear and tear continuously and friction between laundry and stationary back wall causes energy losses
Solution Approach 1:
The back wall is made rotatable together with the drum, transforming a stationary component into a dynamic one that rotates with the drum, thereby eliminating continuous friction between the back wall and tumbling laundry while maintaining structural closure
Solution Approach 2:
The back wall is merged with the drum as a single rotatable unit, so they rotate together as one piece, eliminating relative motion and friction between the back wall and laundry items
2Reliability
If a separate metal closing component is added to the rear wall to guarantee air passage, then air flow is ensured, but the construction becomes complex and costs increase
Solution Approach 1:
The air passage function is merged into the plastic rear bulkhead itself, which is molded with integrated air passages, eliminating the need for separate metal closing components and reducing overall construction complexity
Solution Approach 2:
The plastic rear bulkhead serves multiple functions simultaneously: it provides structural closure, ensures air passage through integrated channels, and supports the drum, replacing multiple separate components with a single multi-functional element
3Stability of the object's composition
If a shaft is used to support the drum at the center of the back wall, then the drum is stably supported, but the drying air flow is prevented from entering the drum area around the shaft
Solution Approach 1:
The shaft and its bearing are extracted from the center of the back wall, removing the obstruction that blocked air flow, while the drum continues to be supported by rollers positioned away from the air passage path
Solution Approach 2:
The support mechanism is moved from a central axial position (shaft at back wall center) to lateral positions (rollers at drum ends), changing the spatial arrangement to allow unobstructed air flow through the previously blocked central area
4Stability of the object's composition
If a shaft with bearing is positioned at the center of the back wall, then the drum is supported, but high force is applied on a limited volume around the shaft at high rotation speeds
Solution Approach 1:
The single central support point (shaft) is segmented into multiple distributed support points (rollers at the ends of the drum), distributing the mechanical load and reducing force concentration on any single point
Solution Approach 2:
The support arrangement transitions from a centralized axial support (shaft at back wall center) to a distributed lateral support system (rollers at drum ends), spreading the load across different spatial locations and reducing stress concentration
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 design reduces wear and tear, energy consumption, and production costs while improving air flow distribution and simplifying assembly, resulting in a more efficient and cost-effective laundry drying process.
Implementation Method 1
The hot air is generated for example by means of an electrical resistance or using a heat pump
Implementation Method 2
The hot air traverses the inside of the drum and is saturated with the moisture transferred by the laundry items contained therein
Implementation Method 3
a duct along which preferably a fan forces the air into the drum, after the air itself has been heated
Implementation Method 4
the drum is rotatably supported in the front and rear areas thereof by means of pairs of wheels or rollers
Data Source
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AI summary
The present invention relates to a laundry dryer (1) comprising a drum (3) rotatable accommodated within the dryer cabinet (2). The dryer cabinet (2) comprises a basement (24) realized in plastic material. The drum (3) has a first end (3a) being an open end facing a front bulkhead (70) and being rotatably coupled to the same. The drum further has a second end (3b) fixedly closed by a back wall (8) which rotates unitarily with the drum, said second end (3b) facing a rear bulkhead (60) and being rotatably coupled to the same. The laundry dryer (1) comprises further: at least one first roller (10a) and at least one second roller (10b) for rotatably supporting said drum; at least one first roller support (100a) to rotatably support said at least one first roller in proximity of said first end of said drum and at least one second roller support (100b) to rotatably support said at least one second roller in proximity of said second end of said drum. The front and rear bulkhead (60, 70) are each realized in plastic material. The at least one first roller support (100a) is provided either on one of the shell portions (24a, 24b) of the basement (24), or in said front bulkhead. The at least one second roller support (100b) is provided on one of the shell portions (24a, 24b) of said basement or in said rear bulkhead.