Crisper Humidity Control Knob with Threaded Airflow Adjustment
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Solution Overview
Problem
Existing humidity control devices for crisper compartments in refrigerators are complex from a structural and assembly perspective, and lack ergonomic improvements, especially with increasing numbers of compartments and drawers in modern appliances.
Innovation Solution
A humidity control device featuring a knob with a threaded coupling between an outer ring and cap, allowing precise and continuous adjustment of airflow, accompanied by graphic indicia for user guidance and optionally including a humidity indicator and ethylene scrubber for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex rotatable knob mechanisms with multiple control plates are used to control ventilation holes, then airflow adjustment capability is improved, but device complexity increases
Solution Approach 1:
The ventilation control is divided into multiple independently controllable ventilation holes, each with its own simple cap and threaded coupling mechanism. This allows each hole to be adjusted separately while using a simple, standardized control structure for each, avoiding the need for a single complex multi-plate mechanism.
Solution Approach 2:
The control mechanism is extracted from a single complex rotatable knob with multiple control plates and distributed into multiple independent caps, each controlling one ventilation hole. This extraction simplifies each individual control element while maintaining overall adjustment capability.
2Manufacturing precision
If multiple control plates with arc-shaped cross-sections are used to correspond to ventilation holes, then airflow control precision is improved, but manufacturing complexity increases
Solution Approach 1:
Each ventilation hole is equipped with a simple cap and threaded coupling instead of expensive, precisely machined arc-shaped control plates. The simple geometry of the caps makes them inexpensive to manufacture while still providing effective airflow control through the threaded adjustment mechanism.
3Ease of operation
If rotatable knobs with actuation paths and latching positions are used, then operational control is improved, but structural complexity increases
Solution Approach 1:
Instead of using a rotatable knob that moves along an actuation path with latching positions, the invention uses a straightforward threaded coupling where rotation directly translates to linear movement of the cap toward or away from the shelf. This inverted approach simplifies the structure while maintaining operational control.
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 solution provides a simple, cost-effective, and ergonomic means to finely adjust humidity levels, improving preservation of fruits and vegetables by allowing precise airflow control and visual humidity monitoring, while preventing ethylene gas buildup.
Implementation Method 1
said ring and said cap being movable relative to each other in an axial direction by way of a threaded coupling
Implementation Method 2
a gasket arranged between the cap and the shelf and configured to seal a space defined between the cap and the shelf when in contact with the shelf
Data Source
Figure 1~2
Figure 3
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AI summary
A household refrigerator appliance (100) comprises a cabinet (110), a refrigerator cavity (111) formed inside said cabinet (110) and a crisper compartment (114) formed in said refrigerator cavity (111). A humidity control device (120) is operably associated with the crisper compartment (114). The humidity control device (120) is a knob mounted on a hole allowing fluid communication between the refrigerator cavity (111) and the crisper compartment (114). The knob has an outer ring (121) surrounding a cap (122), said ring (121) and said cap (122) being movable relative to each other in an axial direction between a closed position, where they engage each other to form a seal against passage of fluids, and an open position, where they are spaced apart in the axial direction, thereby selectively allowing a flow of fluids between the refrigerator cavity (111) and the crisper compartment (114).