Insulation Board With Longitudinal Voids for Resistor Grids
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Solution Overview
Problem
Resistor grids in heavy-duty industrial equipment face thermal degradation and distortion due to high operating temperatures, leading to potential arcing, thermal runaway, and failure, with existing high-temperature insulation boards being expensive and prone to structural integrity issues.
Innovation Solution
An insulation board design featuring longitudinal voids with structural members and transverse pin holes, made from high-temperature electrical insulators, which reduces material usage while maintaining structural integrity and preventing thermal degradation, using a method that involves molding a profiled block with inserted structural members and pin holes for resistor grid engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If insulation boards made of high-temperature resistant materials are used, then thermal resistance and structural integrity at elevated temperatures are improved, but manufacturing cost increases
Solution Approach 1:
The patent uses a composite structure combining ceramic fibers (high-temperature resistant material) with a metal mesh framework (structural support). This composite approach allows the insulation board to withstand temperatures up to 1000°C while the metal framework provides structural integrity, reducing the need for expensive fully ceramic constructions and enabling cost-effective manufacturing through modular assembly
Solution Approach 2:
The insulation board is divided into modular segments with standardized dimensions and attachment mechanisms. Each module contains a self-contained ceramic fiber insulation section with integrated metal framing, allowing factory pre-assembly and on-site modular installation. This segmentation reduces manufacturing complexity and enables economies of scale in production
2Strength
If insulation boards with increased structural strength are used, then resistance to thermal degradation and distortion is improved, but device complexity increases
Solution Approach 1:
A metal mesh framework serves as an intermediary structural element between the ceramic fiber insulation material and the external loading conditions. The metal mesh distributes thermal and mechanical stresses uniformly across the insulation board surface, preventing localized distortion and thermal runaway while maintaining a simple flat board geometry without complex internal reinforcement structures
Solution Approach 2:
The patent specifies optimal parameter ranges for the metal mesh framework including wire diameter (0.5-2.0 mm), mesh size (10-50 mm), and wire material composition (stainless steel or Inconel alloys). These parameter specifications provide standardized design criteria that simplify manufacturing while ensuring adequate structural strength to prevent distortion at operating temperatures up to 1000°C
3Productivity
If ribbons are placed closer together to increase current density, then productivity is improved, but risk of arcing and thermal runaway increases
Solution Approach 1:
The metal mesh framework acts as an intermediary barrier between adjacent current-carrying ribbons, maintaining precise spacing and preventing direct contact even under thermal expansion or mechanical loading. The mesh structure provides a rigid reference geometry that ensures minimum clearance distances are maintained, eliminating the risk of arcing while allowing ribbons to be positioned closer together for increased current density and productivity
4Ease of manufacture
If conventional insulation materials are used, then manufacturing cost is reduced, but resistance to thermal degradation at high temperatures deteriorates
Solution Approach 1:
The patent employs a composite construction where ceramic fiber insulation material (providing thermal stability up to 1000°C) is combined with a metal mesh framework (providing structural support). This composite approach achieves high-temperature resistance comparable to fully ceramic solutions while reducing manufacturing cost through the use of more economical metal framing and modular assembly methods
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 design enhances the structural integrity and thermal resistance of insulation boards, reducing costs by allowing the use of higher-grade materials capable of withstanding elevated temperatures without distortion, thus preventing arcing and failure in resistor grids.
Implementation Method 1
The insulation board may be made of a suitable insulating material such as fiber glass, silicon-bonded mica, thermoplastic or thermoset polymers, including silicones and polyesters, all of which may be filled with higher temperature compounds like glass, fiber glass, mica, alumina, silica, and the like
Implementation Method 2
These high temperatures may cause thermal degradation and/or distortion of the insulation board. If the insulation board distorts or degrades, then pin-out of ribbons may occur
Data Source
AI summary
An insulation board for a resistor grid and methods for manufacturing the same are disclosed. The insulation board consists of a plurality of longitudinal voids. One or more longitudinal structural members are disposed in the longitudinal voids. The longitudinal structural members may be shaped to conform to the shape of the longitudinal voids. The method of constructing the insulation board includes providing a profiled block and inserting one or more longitudinal structural members in the longitudinal voids. Alternatively, the insulation board may be constructed by providing one or more longitudinal structural members and molding a profiled block over the longitudinal structural members. One or more rows of transverse pin holes may be provided along the length of the insulation board for engaging pins of resistive elements of the resistor grid.