Angled Pressure Redirection Shield for Circuit Breaker Fouling
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Solution Overview
Problem
Existing circuit breakers face significant fouling issues due to particulate debris and pressurized air during overload events, which can shorten their service life and render them inoperable, particularly in high-intensity testing conditions, and current shielding solutions are not effective in preventing this contamination.
Innovation Solution
A pressure redirection barrier with angled segments is designed to redirect particulate debris and pressurized air away from critical areas within the breaker, specifically the trip mechanism, using a configuration of U-shaped structures and securing mechanisms to ensure effective coverage and orientation, thereby preventing fouling and extending the breaker's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit breakers are subjected to repeated short circuit tests under high current conditions, then the operational capability and safety of the breaker can be assessed, but extensive fouling of components occurs which can render the breaker inoperable
Solution Approach 1:
The patent extracts and removes particulate debris from the mechanism chamber using a port and airflow system. The port provides a designated exit path for particulates to be drawn out of the enclosure, separating the harmful particulate removal function from the main breaker structure.
Solution Approach 2:
The patent uses pneumatic principles by creating controlled airflow through the enclosure during tripping events. The airflow system uses pressure differentials to draw particulate debris out through the port, utilizing gas flow to remove harmful contaminants from the mechanism chamber.
2Object-generated harmful factors
If the air pressure within the enclosure is increased during arcing events, then the arc can be quenched, but particulate debris is dispersed within the enclosure causing fouling of other components
Solution Approach 1:
The patent converts the harmful effect of pressurized air dispersing particulates into a beneficial effect by using the same pressurized airflow to actively remove particulates through the port. The airflow that would otherwise spread contamination is redirected to extract contaminants from the mechanism chamber.
Solution Approach 2:
The patent introduces an intermediary port structure that mediates between the pressurized air environment and the external atmosphere. This port serves as a controlled interface that allows particulate-laden air to exit while preventing uncontrolled dispersion throughout the enclosure.
3Object-affected harmful factors
If conventional shielding parts are used to protect the trip mechanism, then some coverage is provided, but portions of the trip mechanism remain uncovered and fouling still occurs
Solution Approach 1:
The patent divides the protection system into functional segments: a port structure for particulate removal, an airflow system for active extraction, and a barrier element for direct shielding. This segmentation allows each component to perform its specific function effectively rather than relying on a single complex shield.
Solution Approach 2:
The port structure serves multiple functions: it acts as a physical barrier to direct particulates away from the mechanism, provides an exit path for pressurized air, and works in conjunction with the airflow system to actively extract contaminants. This multi-functionality reduces the need for additional separate shielding components.
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 significantly reduces contamination within the breaker's mechanism chamber and trip mechanism, enhancing the breaker's operational reliability and service life by effectively redirecting pressurized air and particulate debris away from critical components, thus minimizing the need for premature replacement.
Implementation Method 1
the barrier can cooperate with other features within the breaker and its enclosure to facilitate the redirection of pressurized air resulting from arc event away from moving parts within the breaker
Implementation Method 2
the heat of the arc also can cause a sharp localized increase in air pressure within the breaker's enclosure
Implementation Method 3
A pressure redirection barrier with angled segments is designed to redirect particulate debris and pressurized air away from critical areas within the breaker
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A particulate and pressure redirection barrier for an electrical breaker as well as a breaker embodying such a barrier. Such a barrier includes first through fifth segments, where the first segment includes a first and second side section and a bottom section that are coupled to each other so as to form a generally U shaped structure. The second segment is coupled to the first side section so it extends outwardly at an angle from the first side section. The third segment is coupled to the second side section so as to extend outwardly and at an angle from the second side section. The fourth segment is coupled to the second segment so as to extend outwardly from and at an angle with respect to the second segment. The fifth segment is coupled to the third segment so as to extend outwardly from and at an angle with respect to the third segment. Such a configuration of the fourth and fifth segments is such that gas flowing along a surface of the second or third segments is redirected at an angle with respect to that surface.