Dryer Rear Bulkhead Sealing Structure for Higher Airflow
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Solution Overview
Problem
Current rotary-drum home laundry dryers have complex rear wall structures that increase production costs and assembly complexity, with air leakage issues and limited airflow efficiency.
Innovation Solution
A simplified rear wall design featuring a permeable-to-air inner portion of the rotatable drum's back wall, a gasket-supporting member with an annular groove to house the rear sealing gasket, and a sink-shaped bulge on the supporting bulkhead to enhance airflow and reduce gasket wear, allowing for a smaller gasket diameter and improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex rear wall structure with metal gasket-supporting collar and clinching is used, then airtight sealing is achieved, but device complexity and production cost increase
Solution Approach 1:
The invention extracts the gasket-supporting function from the complex metal collar structure and relocates it to the rear bulkhead through an integrated annular groove design. This eliminates the separate gasket-supporting collar component and its clinching mechanism, simplifying the overall rear wall structure while maintaining the airtight sealing function between the drum and casing
Solution Approach 2:
The invention merges the gasket-supporting function with the rear bulkhead structure by directly forming an annular groove in the bulkhead. This combines previously separate components (bulkhead, gasket collar, and sealing mechanism) into a unified structure, reducing part count and assembly complexity while preserving sealing reliability
2Reliability
If a large diameter rear sealing gasket is used to ensure sealing, then airtightness is maintained, but gasket wear increases and assembly becomes more difficult
Solution Approach 1:
The invention performs preliminary action by pre-forming the annular groove in the rear bulkhead at the precise location and dimensions needed. This allows the gasket to be installed in a predetermined position with optimal contact geometry, reducing installation difficulty and ensuring proper sealing without requiring a large gasket diameter
Solution Approach 2:
The invention applies local quality by concentrating the sealing function in a specifically designed annular groove with optimized geometry. The groove provides localized support and alignment for the gasket, enabling effective sealing with a smaller gasket that is easier to handle and install, while the localized structure reduces overall gasket wear through proper load distribution
3Stability of the object's composition
If the rear sealing gasket is firmly fixed to the bulkhead, then sealing stability is improved, but airflow efficiency decreases
Solution Approach 1:
The invention segments the rear wall structure into distinct functional zones: the annular groove for sealing, the central pass-through opening for airflow, and the surrounding bulkhead structure for support. This segmentation allows the sealing function to be localized in the groove while maintaining unobstructed airflow through the central opening, preventing the trade-off between sealing stability and airflow efficiency
Solution Approach 2:
The annular groove acts as an intermediary structure that mediates between the bulkhead and the drum. It provides the necessary sealing interface without blocking the airflow path, as the groove is positioned and dimensioned to seal at the interface while leaving the central area open for hot air circulation. This intermediary structure resolves the conflict between stable sealing and efficient airflow
Data Source
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AI summary
Rotary-drum laundry dryer (1) comprising an outer casing (2) having a front wall (2a) and a rear wall (2b), a rotatable drum (3) which is structured for housing the laundry to be dried and is fixed in axially rotating manner inside the casing (2), and a hot-air generator (6) structured to circulate a stream of hot air through the rotatable drum (3); the rotatable drum (3) comprising a substantially cylindrical, tubular body (3) having a back wall (9) rigidly connected thereto, the tubular body (3) being arranged so that a front rim (3f) thereof is coupled in axially rotating manner to a front bulkhead (13) and so that the back wall (9) is coupled in substantially airtight and axially rotating manner to the rear wall (2b) of the casing (2) with the interposition of a rear sealing gasket (12); the rear wall (2b) of the outer casing (2) comprising: a substantially vertically-oriented supporting bulkhead (14) having a central portion (15) which is substantially aligned/faced to a permeable-to-air inner portion (9c) of the back wall (9) of the rotatable drum (3); and a gasket-supporting member (16) which is fixed/attached to the inner face of the supporting bulkhead (14) so to be interposed between the central portion (15) of said supporting bulkhead (14) and the back wall (9) of the tubular body (3), and which has a central pass-trough opening (16a) substantially aligned/faced to the permeable-to-air inner portion (9c) of said back wall (9) and fluidly connected to the hot-air generator (6); the rotary-drum laundry dryer (1) being characterized in that said supporting bulkhead (14) is fluidly connected to the hot-air generator (6) and said gasket-supporting member (16) is provided with an annular groove (16b) which is faced to the back wall (9) of the tubular body (3), encircles the central pass-trough opening (16a) of the gasket-supporting member (16) and is shaped/ dimensioned so to house the rear sealing gasket (12) and keep said rear sealing gasket (12) in abutment against the back wall (9) of the tubular body (3).