Double-Drum Tumble Dryer Sealing for Air Leakage Control
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Solution Overview
Problem
Tumble dryers face challenges in handling hot, humid air, which can lead to corrosion, electrical issues, and decreased drying performance due to air leakage.
Innovation Solution
The implementation of a double drum configuration with a rotatable inner drum and a fixed outer drum, along with sealing means between the drums and a door, controls the air path and minimizes leakage, enhancing drying efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single drum configuration is used, then the device complexity is low, but the drying efficiency is insufficient due to air leakage
Solution Approach 1:
The single drum is segmented into an inner drum and an outer drum that are coaxially arranged but independent of each other. The inner drum rotates while the outer drum remains stationary, creating separate functional zones that improve air flow control and prevent leakage, thereby enhancing drying efficiency without excessive complexity.
Solution Approach 2:
The inner drum is nested within the outer drum in a coaxial arrangement. This nested configuration allows the process air to flow through the inner drum while the outer drum provides an additional containment layer, preventing air leakage and improving thermal insulation, thus boosting drying efficiency.
2Reliability
If gaskets are introduced to seal the drum, then the air leakage is reduced, but the friction between internal components increases
Solution Approach 1:
A sealing element is introduced as an intermediary component between the inner drum and outer drum. This sealing element prevents air leakage along the air path while being positioned to minimize contact and friction with rotating parts, thus maintaining reliability without significantly increasing frictional forces.
Solution Approach 2:
The sealing element is strategically positioned only at specific locations where air leakage occurs, rather than sealing the entire drum perimeter. This localized sealing approach maintains air path integrity while minimizing the surface area in contact with moving parts, thereby reducing friction.
3Productivity
If the drum is sealed to control air flow, then the drying performance is improved, but the friction between components increases
Solution Approach 1:
The drum system is segmented into rotating and stationary components with sealing elements positioned to seal only where necessary for air flow control. This segmentation allows the sealed air path to improve drying performance while the sealing elements are designed to minimize friction with rotating parts.
Solution Approach 2:
Sealing elements act as intermediaries between the inner and outer drums, creating the necessary sealed path for controlled air flow to improve drying performance. These sealing elements are positioned and designed to minimize contact with rotating components, thereby reducing frictional effects.
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 configuration improves drying efficiency by controlling the air flow and reducing leakage, while also providing better thermal insulation and safety by preventing hot, humid air from escaping and causing corrosion or electrical hazards.
Implementation Method 1
a fan arrangement arranged to generate a flow of process air through the inner drum, wherein the flow of process air enters the inner drum through at least one opening in the second end of the inner drum, and exits the inner drum in a radial direction through at least one opening in the periphery of the inner drum
Implementation Method 2
a second sealing means configured to seal a space between the inner drum and the outer drum... providing better thermal insulation and safety by preventing hot, humid air from escaping
Data Source
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AI summary
Disclosed herein is a tumble dryer (100) having a front (101) and a rear side (102), the tumble dryer (100) comprising a rotatable inner drum (200) having a circular cross section and extending along an axis A, the inner drum (200) having a first (201) and a second end (202), wherein the first end (201) is arranged in the front side (101) the tumble dryer (100), a fixed outer drum (300) coaxially arranged with the inner drum (200) and enclosing said inner drum (200), the outer drum (300) having a first (301) and a second end (302), wherein the first end (301) is arranged in the front side (101) the tumble dryer (100). The tumble dryer further comprises a first (310) and a second (210) sealing means.