Circuit Breaker Ventilation Channel Heat Dissipation
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Solution Overview
Problem
Circuit breakers face challenges in efficiently dissipating heat generated by electrical power loss, leading to high device temperatures and concentrated hot spots, which can reduce their lifespan and performance, especially when handling higher rated currents.
Innovation Solution
A circuit breaker design featuring a continuous ventilation channel along fixed contact pieces and additional convective air flows in the L-side and T-side connection areas, which enhance heat dissipation through strategically redesigned contact and housing structures, including U-shaped fixed contacts and recesses that form a ventilation channel without obstructing airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If circuit breakers are designed for larger rated currents, then the power loss increases proportionally to the square of the rated current, but the housing volume remains constrained
Solution Approach 1:
The patent introduces a longitudinal ventilation channel running through the housing along the longitudinal axis, utilizing the length dimension of the housing for heat dissipation. This allows heat to be carried away by convective air flow along the entire length of the device, effectively increasing the heat dissipation capacity without expanding the cross-sectional area or volume of the housing.
Solution Approach 2:
The patent employs natural convection currents (a pneumatic principle) to create continuous air flow through the ventilation channel. The heated air rises and is replaced by cooler air, creating a self-sustaining convective flow that efficiently removes heat from the contact pieces and current paths without requiring active cooling mechanisms.
2Temperature
If heat dissipation is achieved through device surfaces, then the heat path becomes long, but this leads to high device temperature levels and concentrated hot spots
Solution Approach 1:
Instead of relying on surface-area-based heat dissipation, the patent creates a three-dimensional convective heat transfer path through the longitudinal ventilation channel. This allows heat to be removed along the length of the device rather than having to travel long distances through solid materials to reach external surfaces.
Solution Approach 2:
The patent introduces air as an intermediary medium to facilitate heat transfer. The convective air flow acts as a heat carrier, directly removing thermal energy from the contact pieces and current paths through the ventilation channel, bypassing the need for long conductive heat paths through the device structure.
3Area of stationary object
If circuit breakers are arranged next to each other, then space is optimized, but heat dissipation surfaces may be covered
Solution Approach 1:
The patent shifts heat dissipation from surface-based to volume-based convective cooling. The longitudinal ventilation channel utilizes the internal volume of the housing to create effective heat removal paths that do not depend on external surface area, allowing circuit breakers to be closely arranged without compromising heat dissipation capability.
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
This design allows for significant reduction in temperature levels and enables higher rated current densities within the same structural volume, preventing heat dissipation surfaces from being covered when circuit breakers are arranged next to each other, thus improving the circuit breaker's operational efficiency and longevity.
Implementation Method 1
a continuous ventilation channel is formed within opposite housing walls along the fixed contact pieces as the first convective air flow through the circuit breaker for heat dissipation
Implementation Method 2
air flowing into the openings provided from below can absorb heat loss directly from some of the main power loss generators, i.e. from contact transition points and current paths, and transported in the direction of the feed side and discharged there to the outside into the air
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a circuit breaker with a housing in which a first switching device area (1), in which a quenching chamber device (5) and a contact sliding device (7) with movable switching elements (9) are arranged opposite fixed switching elements (10), and a second switching device area (3), in which a current release group consisting of a short-circuit release (17) and an overload release (26) are arranged, are arranged. The invention is characterized in that a continuous ventilation channel (33) within opposing housing walls along the fixed switching elements (10) is designed as a first convective airflow through the circuit breaker for heat dissipation.