Exhaust Gas Purification Device Flange Alignment
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Solution Overview
Problem
Existing exhaust gas purification devices experience creep in clamping devices due to exposure to heat, leading to a decrease in urging force and deteriorated hermeticity, particularly when mounting or removing the purifying cylinder between upstream and downstream cylinders.
Innovation Solution
The design incorporates engagement pins and grooves with specific radial and axial dimensions, along with guide rib portions and gasket insertion grooves, to ensure coaxial alignment and secure contact between flange portions, preventing creep and maintaining hermeticity by using engagement pins and guide rib portions to align and secure the purifying cylinder relative to upstream and downstream cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the filter accommodating cylinder is mounted or removed while the upstream and downstream cylinders are fixed to supporting brackets, then the purifying cylinder can be independently serviced, but a slight space is formed between gaskets and flange portions leading to creep in clamping devices
Solution Approach 1:
The engagement pins are provided with engagement recess portions that are recessed inward in the radial direction, and the engagement grooves are formed to receive these recess portions. This preliminary geometric design ensures that when the purifying cylinder is mounted, the engagement pins automatically align and engage with the grooves, pre-establishing proper coaxial alignment and eliminating gaps before the clamping devices are fully tightened, thereby preventing creep while maintaining ease of assembly
Solution Approach 2:
The engagement pins act as intermediary elements between the purifying cylinder and the upstream/downstream cylinders. These pins with their specific geometric features (recess portions and corresponding grooves) mediate the connection, ensuring precise positioning and preventing relative movement that would cause creep, while allowing the purifying cylinder to be independently mounted and removed
2Reliability
If the clamping devices tightly secure the flange portions to eliminate space, then hermeticity is maintained, but the clamping devices are exposed to exhaust gas heat causing creep and decreased urging force
Solution Approach 1:
The engagement pins with recess portions and engagement grooves are designed to pre-establish secure mechanical interlocking and precise alignment before the clamping devices are fully engaged. This preliminary action ensures that the flange portions are already tightly positioned with minimal gap, reducing the thermal stress and creep tendency of the clamping devices while maintaining hermetic sealing
Solution Approach 2:
The connection system is segmented into distinct functional elements: engagement pins for positioning and initial securing, engagement grooves for receiving the pins, and clamping devices for final tight sealing. This segmentation allows each component to perform its specific function optimally, with the engagement pins preventing creep through geometric constraint while the clamping devices maintain hermeticity
Data Source
AI summary
An exhaust gas purification device includes an upstream cylinder, a downstream cylinder, and a purifying cylinder. The upstream cylinder, the purifying cylinder, and the downstream cylinder each have at an end thereof a flange portion having a flat connecting surface. Each flange portion of one of the upstream and downstream flange portions of the purifying cylinder, and the flange portions of the upstream cylinder and the downstream cylinder includes an engagement pin having an engagement recess portion. Each flange portion of the other includes a pin hole and an engagement groove. The engagement recess portion is fitted into and engaged with the engagement groove.