Pressure Equalization Element with Impact Guard for Sealed Housings
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Solution Overview
Problem
Existing pressure equalization elements in sealed electrical housings are prone to damage from mechanical and environmental factors, leading to seal weakening, moisture ingress, and potential corrosion due to impermeability loss from solids particles, with complex and costly diaphragm replacement.
Innovation Solution
A pressure equalization element featuring a semipermeable diaphragm attached to a housing with a holding structure and impact guard, which protects the diaphragm from mechanical damage and allows for easy installation and production, ensuring reliable and inexpensive pressure equalization between the housing interior and exterior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diaphragm is directly bonded or welded to a bore in the housing, then pressure equalization is achieved, but the diaphragm is vulnerable to mechanical damage and solids particle contamination
Solution Approach 1:
The patent introduces an intermediary structure (holding structure with impact guard) between the diaphragm and the external environment. This holding structure accommodates an impact guard that protects the diaphragm from mechanical damage and solids particle contamination while allowing the diaphragm to perform its pressure equalization function. The holding structure acts as a mediator that shields the vulnerable diaphragm from harmful external factors.
2Duration of action of stationary object
If the diaphragm is protected from mechanical action, then service life is extended, but device complexity increases
Solution Approach 1:
The patent merges the holding structure with the housing by forming it as an integral part of the housing wall surrounding the bore. This integration approach extends diaphragm protection without significantly increasing overall device complexity, as the holding structure is combined with the existing housing structure rather than being a separate additive component.
3Object-affected harmful factors
If a covering label or cap is bonded to the diaphragm, then protection is provided, but exchange and repair become complicated and expensive
Solution Approach 1:
The patent segments the protection system into separate functional components: the diaphragm for pressure equalization, the holding structure for accommodation, and the impact guard for protection. This segmentation allows the diaphragm to be exchanged independently without replacing the holding structure or impact guard, significantly improving repair ease and reducing costs while maintaining comprehensive protection.
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 long-lasting, cost-effective, and structurally optimized pressure equalization system that minimizes diaphragm damage and moisture ingress, ensuring reliable operation and extended service life by protecting the diaphragm from mechanical and thermal loads.
Implementation Method 1
a diaphragm (130) which is arranged to close off the hole with respect to the outer side (114) of the housing in water-tight but air-permeable fashion
Implementation Method 2
Pressure equalization elements serve for the aeration of electrical appliances in such sealingly closed housings... such that pressure differences, based for example on temperature changes, between interior air and surroundings can be equalized
Data Source
AI summary
A pressure equalization element for equalizing the pressure of an interior space of a housing, in particular of an electric, motor or gearing housing, of a tank or the like, with respect to an outer side, is specified. The pressure equalization element includes a hole which is formed in a wall of the housing, a diaphragm which is attached on the interior space side in the region of the hole and which closes off the hole with respect to the outer side of the housing in water-tight but air-permeable fashion, and a holding structure which is formed on the housing in the region of the hole and which serves for accommodating an impact guard. The impact guard is connectable, on the outer side of the housing, to the holding structure and protects the diaphragm against mechanical action. A housing having the pressure equalization element is also specified.