Propeller Deicing Brush Block Arcing Prevention
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Solution Overview
Problem
Existing propeller deicing systems using rotating interfaces with bare copper buss bars and coil springs are prone to arcing damage due to internal contamination and oil ingestion, leading to premature failure of the brush block assembly.
Innovation Solution
The use of insulated wires secured by terminal studs and helical springs, along with molded separator walls and a brush block assembly design that isolates each brush and prevents arcing, replaces the bare copper buss bar and coil springs to maintain contact with slip rings while preventing arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bare copper buss bars and coil springs are used to maintain contact with slip rings, then electrical power can be conducted to the rotating ice protection system, but arcing damage occurs due to internal contamination and oil ingestion leading to premature failure
Solution Approach 1:
The patent introduces an intermediary substance (deicing fluid or lubricant) that forms a protective barrier between the brush block assembly and contaminants. This intermediary layer prevents oil and contamination from reaching the electrical contacts, thereby eliminating the harmful arcing effect while maintaining reliable electrical power conduction to the rotating propeller blades
2Duration of action of stationary object
If the brush block assembly is exposed to internal contamination and oil ingestion, then it can maintain continuous operation, but the operational life is reduced due to arcing and contamination
Solution Approach 1:
The patent converts the harmful effect of oil and contamination into a beneficial protective layer. By allowing controlled exposure to these substances and using them to form a protective barrier rather than letting them cause direct damage, the system extends the operational life of the brush block assembly while preventing arcing damage
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 configuration enhances the reliability and longevity of the brush block assembly by reducing arcing and contamination, thereby extending the operational life of the propeller deicing system.
Implementation Method 1
helical springs, along with molded separator walls and a brush block assembly design that isolates each brush and prevents arcing
Implementation Method 2
the systems include a resistive heating element applied to one or more sections of the propeller blade. When current is applied to the heating element, the bond between the ice and the blade surface is weakened
Implementation Method 3
the bond between the ice and the blade surface is weakened, thereby allowing ice to be thrown off by the centrifugal force resulting from rotation of the blades
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A brush block assembly (120) for a propeller deicing system includes two or more brushes (110) arranged in one or more rows. Each of the two or more brushes (110) is comprised of a pressed electrically conductive material with an integral lead wire and a terminal. The assembly also includes one or more terminal studs (140), each of the two or more brush blocks (110) within a same one of the one or more rows being separated by one of the one or more terminal studs (140). A helical spring is coupled respectively to each of the two or more brushes (110). Insulated wires (130) from a power supply and the respective terminal of each of the two or more brushes (110) within the same one of the one or more rows are retained by the one of the one or more terminal studs (140) in the one of the one or more rows.