Drawer gasket seal assembly
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Solution Overview
Problem
The existing gasket assemblies for refrigerator drawers face challenges in providing an optimal seal due to low incremental magnetic force, which limits their ability to conform to variations in the cabinet surface, resulting in inadequate sealing, especially when the drawer is closing, as the closure force decreases as it approaches the closed position.
Innovation Solution
A gasket assembly with a contact lobe made of a more rigid material and featuring longitudinally extending ribs of a less rigid material, designed to fit into a recessed channel on the drawer front, which deforms to fill micro-pathways on the textured cabinet surface, ensuring a tight seal without relying on magnetic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a gasket with internal magnet is used to create attraction between gasket profile and steel cabinet face, then the total magnetic force due to attraction can be high, but the local incremental force on the gasket is low which inhibits the gasket's ability to overcome local variations from flatness or straightness
Solution Approach 1:
The gasket incorporates a contact lobe with varying cross-sectional area along its length, creating localized regions of different rigidity. The contact lobe has a larger cross-sectional area at the sealing end to increase local incremental force where it is most needed for conforming to surface variations, while maintaining lower force in other regions. This non-uniform geometry allows the gasket to overcome local flatness or straightness variations effectively.
Solution Approach 2:
The gasket is constructed as a composite structure with a base portion and an overmolded contact lobe made of different materials. The base portion provides structural support and magnetic properties, while the overmolded contact lobe provides enhanced sealing capability through its softer, more compliant material that can better conform to surface irregularities and provide the necessary local incremental force.
2Force
If drawer slide closing force is used to pull drawer and gasket toward cabinet face, then the closing force is greatest when drawer is further away from cabinet, but the force reduces as drawer approaches closed position which limits the gasket's ability to conform and overcome variation
Solution Approach 1:
The contact lobe is designed with dynamic deformation characteristics that change as the drawer closes. The compliant material and varying cross-sectional area allow the contact lobe to deform more readily under lower closing forces near the closed position, maintaining sealing effectiveness throughout the entire closing trajectory rather than only at specific positions.
Solution Approach 2:
The gasket's cross-sectional area varies along the length of the contact lobe, with the sealing end having a larger area to increase local compliance and force. This geometric parameter change ensures that the gasket maintains adequate sealing pressure even when the overall closing force diminishes as the drawer approaches the closed position.
3Reliability
If a gasket with larger contact area is used to improve sealing, then the sealing ability should be enhanced, but the contact area increases which may reduce the incremental force per length
Solution Approach 1:
The contact lobe features a non-uniform cross-sectional area with the sealing end having a larger area to provide both increased contact area for sealing and concentrated local incremental force where it is most needed. This localized geometric variation allows the gasket to simultaneously achieve good sealing contact and sufficient force to overcome surface variations at the critical sealing interface.
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 gasket assembly effectively maintains an air-tight seal with a reduced contact area, ensuring a consistent seal across the drawer's closure path, even as the closure force diminishes, by utilizing the soft, deformable ribs to fill micro-pathways on the cabinet surface, enhancing the sealing performance.
Implementation Method 1
The at least one rib is comprised of a less rigid material relative to the more rigid material of the body portion of the contact lobe
Implementation Method 2
the soft, deformable ribs to fill micro-pathways on the cabinet surface
Data Source
AI summary
A drawer assembly of a refrigerator includes a gasket assembly having a base portion with opposed first and second sides. A mounting portion extends outwardly from the first side of the base portion, and a contact lobe outwardly extends from the second side of the base portion. The contact lobe includes a body portion comprised of a first material having an outer surface with one or more ribs comprised of a second material that is less rigid than the first material. The one or more ribs extend outwardly from the outer surface of the body portion of the contact lobe and are configured to seal against a textured front surface of a cabinet structure of the refrigerator.