Motorized Freezer Drawer with Obstacle-Sensing Rack Drive
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing refrigerator designs, particularly bottom freezer types, face challenges in user convenience and accessibility due to the need for users to stoop to open the freezer compartment, which can be physically demanding for children and the elderly, and the inefficiency of automatic openers that require a handle pull, leading to reduced utility and potential cold air leakage.
Innovation Solution
A system that includes a drive motor and gear assembly integrated into the refrigerator floor to automatically move a storage box forward and rearward, eliminating the need for a handle by using a pinion and guide rack mechanism to ensure straight withdrawal and insertion, with sensors for obstacle detection and speed control to maintain preset movement speeds regardless of load weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a handle pull mechanism is used for automatic opening, then the freezer compartment can be opened automatically, but it requires user interaction and may cause cold air leakage
Solution Approach 1:
The system performs preliminary detection of user intent through sensors (weight detection, proximity sensors, or camera recognition) before the drawer needs to be opened. This allows the motor to be activated in advance, moving the drawer to an open position before the user would need to pull the handle, thereby preventing cold air leakage that would occur during manual handling.
Solution Approach 2:
The drawer opening system operates autonomously by detecting user presence or intent through various sensors and automatically executing the opening action without requiring user interaction with a handle. The system serves itself by eliminating the need for manual operation, thus preventing cold air leakage associated with traditional handle-pulling methods.
2Extent of automation
If a motor and gear assembly are integrated into the refrigerator floor, then the drawer can be moved automatically, but the device complexity increases
Solution Approach 1:
The motor and gear assembly are merged into a single integrated unit that is embedded within the refrigerator floor structure. This consolidation reduces the number of separate components and simplifies the overall system architecture while maintaining automatic drawer movement functionality.
Solution Approach 2:
A pinion gear acts as an intermediary mechanism between the motor and the drawer. The pinion engages with a guide rack to convert rotational motor motion into linear drawer movement, providing a simple yet effective transmission mechanism that reduces complexity compared to more elaborate gear systems.
3Stability of the object's composition
If a pinion and guide rack mechanism is used, then the drawer withdrawal and insertion are ensured to be straight, but the manufacturing precision requirements increase
Solution Approach 1:
The guide rack is designed to extend fully across the width of the drawer, creating a stable reference plane that ensures uniform and straight movement. This equipotential guiding structure distributes the alignment requirements across the entire contact surface, reducing the precision demands on individual pinion teeth while maintaining overall movement stability.
4Reliability
If sensors for obstacle detection are added, then accidents can be prevented, but the device complexity increases
Solution Approach 1:
Sensors are integrated into the motor control system to provide real-time feedback on drawer movement and obstacle detection. When an obstacle is detected, the sensor signal immediately feeds back to the controller, which adjusts or stops motor operation to prevent accidents. This feedback mechanism enhances safety without requiring separate complex control systems.
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
Enhances user convenience by allowing automatic and effortless opening of the freezer compartment without a handle, reduces physical strain, maintains insulation integrity, and prevents accidents by stopping the drawer when encountering obstacles, ensuring consistent withdrawal speed regardless of load weight.
Implementation Method 1
a drive motor and gear assembly integrated into the refrigerator floor to automatically move a storage box forward and rearward
Data Source
AI summary
A system and method for driving a drawer of a refrigerator and a refrigerator employing this system is provided. This system and method allows the drawer to substantially immediately and automatically stop when the drawer encounters an obstacle. This type of automatic control of the drawer may enhance the safe operation of the drawer, prevent injuries to users, and prevent overload and subsequent malfunction of a drive motor used to move the drawer.