Exhaust Gas Purifying Device Offset Flange and Flexible Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas purifying devices for diesel engines face challenges such as increased space requirements due to flange dimensions, difficulty in maintenance due to flush end faces, and inefficiencies in compact design and noise reduction, along with issues in handling oscillation-induced stress and sealing performance.
Innovation Solution
The design includes offset flange connections, overlapping inner and outer cases with flexible support bodies, and strategically placed noise damping materials to enhance compactness, maintenance accessibility, and vibration damping, while optimizing the inlet pipe configuration for improved exhaust gas flow and reduced pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a flange body connecting multiple casings is arranged in the mating face of multiple particulate filters, then the connection between casings is strengthened, but the casing dimension in the gas moving direction must be enlarged to accommodate the sensor mounting boss body, forming useless space
Solution Approach 1:
The flange body is positioned offset from the mating face of the particulate filters, moving the connection interface to a different spatial location. This allows the sensor mounting boss body to be integrated into the flange structure itself, eliminating the need for additional casing extension and avoiding useless space while maintaining connection strength
2Volume of moving object
If the end face of the filter case is made flush with the end face of the outer case, then the overall structure is more compact, but the exposure range of the filter case becomes small, making maintenance work difficult
Solution Approach 1:
The filter case is segmented from the outer case structure, allowing it to protrude beyond the outer case end face. This segmentation enables the filter case to maintain a compact overall structure when assembled while providing sufficient exposure for maintenance operations when the casing is disassembled
3Stability of the object's composition
If the inlet pipe is formed as a taper tube shape to uniformly supply exhaust gas, then the gas distribution is improved, but the gradient of the taper tube is limited, preventing the inlet pipe length from being shortened
Solution Approach 1:
The inlet pipe incorporates a tapered section with an optimized gradient that balances gas flow uniformity with length reduction. The taper angle is specifically designed to achieve adequate mixing and distribution of exhaust gas while allowing the pipe to be shorter than conventional designs, improving compactness without sacrificing flow characteristics
4Stability of the object's composition
If the inlet pipe is inserted toward the center of the casing space to improve gas distribution, then the exhaust gas flow uniformity is enhanced, but the dimension in the exhaust gas movement upstream direction cannot be shortened
Solution Approach 1:
The inlet pipe is positioned asymmetrically within the casing, with its center offset from the casing centerline. This asymmetric arrangement allows the pipe to extend toward the center for improved gas distribution while the overall casing dimension in the upstream direction remains compact, as the pipe does not require symmetric clearance on both sides
5Strength
If the outer case, inner case, and particulate filter are rigidly connected to ensure structural stability, then the structural integrity is improved, but oscillation from the diesel engine is transmitted to the particulate filter, causing deformation and reduced sealing performance
Solution Approach 1:
A flexible support body made of elastic material is introduced between the rigid components (outer case, inner case, and particulate filter). This flexible element maintains structural integrity by connecting the components while absorbing oscillation forces from the diesel engine, preventing stress transmission that would cause deformation and sealing failures
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 allows for a more compact and lightweight design with improved maintenance accessibility, enhanced noise reduction, and increased durability by reducing vibration-induced stress and maintaining effective sealing performance.
Implementation Method 1
a ring-shaped vibration damping support body 7, made of an elastic material, is interposed between the inner case 4 and the outer case 5
Data Source
AI summary
Provided is an exhaust gas purifying device structured such that a gas sensor or the like can be easily arranged while an installation length of gas purifying filters can be formed compact. The exhaust gas purifying device includes the gas purifying filters for purifying an exhaust gas discharged from an engine, inner cases internally provided with the gas purifying filters, and outer cases internally provided with the inner cases. Provided are sets of the gas purifying filters, the inner cases and the outer cases, and flange bodies connecting plural sets of outer cases are offset with respect to a connection boundary position of plural sets of gas purifying filters.