Exhaust Injector Connection Device Thermal Management
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Solution Overview
Problem
Existing connection devices for injectors in exhaust systems of internal combustion engines face issues with overheating and vibration-induced failures, particularly when used upstream of SCR catalyzers, due to high temperatures and inadequate thermal insulation and vibration damping.
Innovation Solution
A connection device with a thermally conductive tubular support body, radial heat dissipation fins, and a vibration damping mechanism using elastic elements and insulating materials to manage heat exchange and prevent damage from vibrations, ensuring effective thermal insulation and vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If radial fins are uniformly distributed over the whole length of the support body, then heat dissipation is improved, but vibration-induced failure of the fins occurs
Solution Approach 1:
The support body is divided into distinct zones: a first zone with uniformly distributed radial fins for heat dissipation, and a second zone with a different fin configuration to reduce vibration sensitivity. This segmentation allows each zone to serve its specific function while minimizing the overall vibration-induced failure risk.
Solution Approach 2:
Different portions of the support body are given different fin characteristics - the first zone has fins optimized for heat dissipation while the second zone has fins designed to be less vibration-sensitive. This local differentiation resolves the contradiction by allowing heat dissipation where most needed while reducing vibration vulnerability in susceptible areas.
2Productivity
If the electromagnetic injector is placed in the exhaust duct, then NOx reduction function is achieved, but overheating and destruction of the injector occurs
Solution Approach 1:
The support body acts as an intermediary between the exhaust duct environment and the electromagnetic injector. It provides thermal insulation to protect the injector from overheating while maintaining the injector's position in the exhaust duct for NOx reduction functionality.
Solution Approach 2:
The electromagnetic injector is nested within the support body, which provides a protective thermal environment. This nested structure allows the injector to function in the high-temperature exhaust duct while being thermally protected by the surrounding support body structure.
3Temperature
If thermal insulation is enhanced to protect the injector, then injector protection is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The support body implements different thermal characteristics in different zones: the first zone provides thermal insulation to protect the injector, while the second zone with radial fins provides heat dissipation pathways. This local differentiation resolves the contradiction between protection and heat dissipation.
Solution Approach 2:
The support body is segmented into functional zones with different thermal properties - an insulating zone for protection and a dissipating zone with radial fins for heat release. This segmentation allows simultaneous achievement of injector protection and effective heat dissipation.
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 solution provides robust, cost-effective thermal insulation and vibration damping, preventing overheating and failure of the electromagnetic injector, ensuring reliable operation in high-temperature exhaust environments while maintaining efficient heat dissipation and ammonia dispersion for NOx reduction.
Implementation Method 1
a heat dissipation element arranged to ensure an adequate thermal insulation of the injector itself from the heat of the exhaust system while allowing an effective heat disposal
Implementation Method 2
the heat which is transmitted by conduction and irradiation to the injector
Implementation Method 3
a tubular support body, which is made of thermally conductive material, accommodates the injector therein
Implementation Method 4
the vibrations which, in use, are transmitted to the heat dissipation device may accidentally cause the failure of the heat dissipation device itself
Implementation Method 5
ensure an adequate thermal insulation of the electromagnetic injector from the heat of the exhaust system
Data Source
Figure 1
Figure 2
AI summary
A device (13) for connecting an injector (12) to an exhaust system (1) in an internal combustion engine (2) provided with an connection pipe (15) which laterally protrudes from an exhaust duct (3); the connection device (13) comprises a tubular support body (14), provided with a longitudinal symmetry axis (16), made of a thermally conductive material, adapted to accommodate the injector (12) therein and to be coupled to the connection pipe (15), and provided win turn with a heat dissipation device (24) coaxial to the longitudinal symmetry axis (16). The connection device is further provided with a device (25) for damping the vibrations transmitted to the heat dissipation device (24), having in turn a number of elastic elements (26) coaxial to the longitudinal symmetry axis (16) and accommodated at the lower portion of the support body (14).