Refrigerator Door Pressure Valve Assembly to Prevent Icing
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Solution Overview
Problem
Conventional pressure equalization valves in refrigeration appliances tend to ice up, leading to operational failures, require significant installation effort, and are not easily replaceable or repairable, while also allowing continuous air and heat exchange.
Innovation Solution
A valve assembly with an inlet and outlet on different sides of a seal, featuring a recess for easy installation and a second seal for air-tight anchoring, utilizing a membrane that seals via surface contact rather than edge contact, and a sealing ring for secure positioning, which reduces the risk of leakage and icing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure equalization valve is installed by embedding it in insulation material, then the valve can be securely positioned, but the installation effort increases significantly and the valve becomes difficult to replace or repair
Solution Approach 1:
The pressure equalization valve is divided into separate modular components: a valve body, a sealing element, and a positioning structure. This segmentation allows the valve to be installed as a complete unit without embedding in insulation material, reducing installation effort while maintaining secure positioning through the positioning structure that engages with the housing wall.
Solution Approach 2:
The valve assembly is pre-assembled with the sealing element and positioning structure attached before installation. This preliminary preparation ensures proper sealing and positioning without requiring complex on-site installation procedures or embedding in insulation material, thereby reducing installation effort while maintaining reliability.
2Reliability
If a conventional pressure equalization valve is embedded in insulation material, then the valve is securely anchored, but the valve cannot be easily replaced or repaired when defective
Solution Approach 1:
The valve is designed as a modular assembly with distinct components that can be independently replaced. The valve body, sealing element, and positioning structure are separate, allowing the entire valve assembly to be removed and replaced as a unit without damaging the insulation material or housing, thereby enabling easy repair while maintaining secure anchoring during operation.
Solution Approach 2:
The positioning structure incorporates movable or adjustable elements that allow the valve to be securely anchored during operation but easily removed when needed for replacement. This dynamic design enables the valve to transition between a secured state during operation and a removable state for maintenance, resolving the contradiction between secure anchoring and replaceability.
3Reliability
If a passage is created through the seal for pressure equalization, then negative pressure is prevented, but continuous air exchange and heat transfer occur between the interior and environment
Solution Approach 1:
The pressure equalization valve incorporates a movable closing body (membrane or valve element) that dynamically opens only when negative pressure differential exists across the seal. When pressures are balanced, the closing body automatically seals the passage, preventing continuous air exchange and heat transfer. This dynamic operation allows the system to maintain pressure equalization functionality while minimizing energy losses during normal operation.
Solution Approach 2:
The valve mechanism incorporates a feedback system where the pressure differential itself controls the valve position. When negative pressure develops, the pressure difference automatically opens the valve to equalize pressures. When pressures are balanced, the valve closes automatically. This pressure-driven feedback control ensures the passage remains closed during normal operation, preventing continuous heat and moisture exchange while maintaining pressure equalization when needed.
4Device complexity
If a membrane seals against the walls of the passage in a conventional lip valve, then the valve can be simple in structure, but the sealing effect is poor and dimensional accuracy requirements are high
Solution Approach 1:
The sealing surface of the closing body is designed with a curved or spherical geometry that matches a corresponding curved sealing surface on the valve seat. This curved contact provides a larger sealing area and more forgiving dimensional tolerances compared to edge sealing, improving the sealing effect while maintaining simple valve structure. The curved surfaces naturally conform to each other, enhancing sealing reliability without requiring high dimensional accuracy.
Solution Approach 2:
The sealing mechanism transitions from edge contact (one-dimensional line contact) to surface contact (two-dimensional area contact). The closing body contacts the valve seat over a substantial surface area rather than along a narrow edge, providing more robust sealing with lower dimensional accuracy requirements. This dimensional change from line to area contact improves sealing reliability while keeping the valve structure simple.
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
Facilitates easy installation and replacement, minimizes the risk of leakage and icing, and maintains air-tight sealing while allowing pressure equalization without continuous air exchange, ensuring efficient operation and reduced maintenance effort.
Implementation Method 1
a closing body lying on it is acted upon by its own weight in the closed position
Implementation Method 2
an overpressure prevailing in the inlet chamber lifts the closing body from the intermediate wall, so that the valve assembly becomes permeable
Implementation Method 3
the second seal can also be used for frictionally engaged, releasable anchoring of the valve assembly in the recess
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to a refrigeration device which comprises a carcass (2) and a door (1) which surround a cooled interior space and which have wall surfaces (3; 7) that face each other and that define a gap filled with a seal (10). A recess (11) bridging the seal (10) is formed into at least one of the wall surfaces (7). A valve assembly (12) having an inlet (16) and an outlet (17) is inserted into the recess (11) on different sides of the seal (10).