Active Exhaust Cooling via Blower and Venturi Nozzle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing passive cooling systems for exhaust systems, particularly in agricultural machines, are inadequate at low speeds or stationary operations due to insufficient airflow, leading to high surface temperatures and safety concerns, such as burns and potential fires, and inefficient DPF regeneration.
Innovation Solution
An active cooling system for exhaust systems that includes a blower to supply compressed air into an air duct surrounding the exhaust pipe, utilizing venturi nozzle arrangements to enhance airflow and reduce temperatures, independent of driving speed, with the air flow being filtered and sourced from the internal combustion engine's cooling system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passive cooling system is used, then cooling is provided during high-speed operation, but cooling capacity is insufficient at low speeds or stationary operation
Solution Approach 1:
The system uses the engine's own cooling exhaust air to cool the exhaust pipe, making the cooling function self-sufficient and independent of vehicle speed. The blower means draw cooling air from the engine compartment where it is already available from the engine cooling process.
Solution Approach 2:
The passive convection-based cooling system is replaced with an active cooling system using blower means to force air circulation. This mechanical substitution ensures consistent cooling performance regardless of vehicle speed or operating conditions.
2Productivity
If high temperature is used for DPF regeneration, then soot particles are burned off effectively, but burn risk and safety hazards increase
Solution Approach 1:
The high-temperature exhaust air that would otherwise be wasted is redirected through the air duct to cool the exhaust pipe externally. This converts the harmful high-temperature waste heat into a beneficial cooling resource, enabling DPF regeneration while simultaneously preventing external overheating and burn risks.
Solution Approach 2:
Instead of discarding the hot exhaust air directly to the environment, the system recovers it by routing it through the air duct to extract cooling energy before final discharge. This recovery process maintains safety while preserving the regeneration function.
3Temperature
If active cooling system with blower is used, then cooling capacity is maintained at all speeds, but device complexity increases
Solution Approach 1:
The air duct serves multiple functions: it guides cooling air from the blower, channels hot exhaust air from the DPF regeneration process, and directs the mixture to the exhaust pipe cooling zone. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The cooling air supply system is merged with the existing engine cooling system by using the same blower means and engine compartment air source. The exhaust cooling function is integrated into the exhaust system structure itself through the air duct arrangement, reducing overall system complexity.
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 system effectively maintains cooling capacity regardless of speed, reducing exhaust pipe temperatures and preventing burns and fires, while supporting DPF regeneration and minimizing nitrogen oxide formation.
Implementation Method 1
The blower means preferably compress the air flow to a pressure level that is higher than the ambient pressure
Implementation Method 2
the exhaust pipe for cooling the exhaust gas flow downstream of the soot particle filter has a first venturi nozzle arrangement
Implementation Method 3
fresh air that is routed past the exhaust pipe between the exhaust pipe and the casing, depending on the speed, absorbs heat given off by the exhaust pipe by convection
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a cooling system (10) for actively cooling an exhaust gas system (12), comprising an exhaust pipe (14) for leading away an exhaust gas flow (22) of an internal combustion engine (16) and an air-conducting element (18), which is arranged across from the exhaust pipe (14) such as to form an air-conducting channel (20) in order to cool the exhaust pipe (14) by introducing an air flow (24) into the air-conducting channel (20).