Refrigerator Door Opening Aid Using Pressure Difference Detection
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Solution Overview
Problem
Existing door opening aids in refrigeration devices face challenges in precise and efficient activation due to pressure fluctuations caused by cooling, making it costly to detect door movement through pressure changes.
Innovation Solution
A household appliance equipped with a pressure detection device that measures the pressure difference between the internal and ambient pressures, triggering a drive device to exert a driving force on the door when predetermined threshold values are reached, allowing for precise and efficient door opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure changes inside the refrigeration device are used to detect door movement, then door opening can be detected, but the cost increases due to expensive pressure sensors required to handle pressure fluctuations from cooling
Solution Approach 1:
A pressure equalization opening is introduced as an intermediary element that connects the sensor chamber to the ambient environment. This opening allows ambient pressure to equalize with the sensor chamber, preventing the sensor from detecting false pressure changes caused by cooling cycles. The intermediary structure enables the use of less expensive pressure sensors while maintaining accurate door movement detection capability.
2Adaptability or versatility
If a front panel is attached to the front of the household appliance to match furniture walls, then aesthetic integration is improved, but the door opening aid cannot be activated unless the front panel is broken through
Solution Approach 1:
The activation element and sensor system are extracted from behind the front panel and repositioned to be accessible through or around the front panel structure. This allows the door opening aid to be activated through the front panel without requiring the panel to be broken through, maintaining both aesthetic integration and operational accessibility.
3Extent of automation
If pressure sensors are used to detect door movement in refrigeration devices, then door opening can be detected, but pressure fluctuations from cooling cause false detections
Solution Approach 1:
A pressure equalization opening serves as a mediator that allows ambient pressure to balance the sensor chamber pressure during cooling cycles. This intermediary structure prevents false pressure differentials from forming, enabling reliable door movement detection without interference from cooling-induced pressure fluctuations.
Solution Approach 2:
The pressure equalization opening provides a controlled pressure equalization path that selectively allows ambient pressure to counterbalance cooling-induced pressure changes only when the door is closed. When the door opens, the pressure differential naturally develops despite the equalization opening, ensuring accurate detection while filtering out false signals during normal operation.
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
Enables precise and efficient activation of the door opening aid by accurately detecting pressure differences and applying a driving force, overcoming the limitations of pressure fluctuations and reducing costs associated with traditional methods.
Implementation Method 1
a pressure detection device for detecting a pressure difference between an internal pressure inside the inner container and an ambient pressure outside the inner container
Data Source
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AI summary
A household appliance includes an interior compartment, a door for closing the interior compartment and a drive facility for assisting with opening the door. The household appliance further includes a pressure sensing facility for detecting or sensing a difference between an interior pressure inside the interior compartment and an ambient pressure outside the interior compartment. The drive facility is configured to apply a driving force to the door as a function of the difference between the pressures.