Venturi Suction Arrangement for Centrifugal Air Filter
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Solution Overview
Problem
Centrifugal air filters used in diesel engines with turbochargers face issues with undesirable shading of heat exchangers due to the suction snorkel protruding into the cooling air flow, leading to heat dissipation deterioration.
Innovation Solution
A suction arrangement incorporating an axial fan and a Venturi nozzle, where the cooling air flow generates negative pressure in a constriction area, preventing shading of heat exchangers and simplifying assembly by integrating the Venturi nozzle into a fan cowl.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a suction snorkel is used to create negative pressure for particle extraction, then coarse particles can be drawn outwards from the separation chamber, but the suction snorkel protrudes into the cooling airflow and causes undesirable shading of upstream heat exchangers, leading to heat dissipation deterioration
Solution Approach 1:
The suction function is extracted from a protruding snorkel and relocated to a Venturi nozzle positioned downstream of the axial fan. This extraction removes the harmful shading effect while preserving the particle extraction capability through the negative pressure generated by the Venturi effect in the cooling airflow.
Solution Approach 2:
The suction mechanism is moved from a vertical protruding structure (snorkel) to a horizontal flow-based structure (Venturi nozzle) positioned downstream. This dimensional repositioning allows the suction function to be achieved without obstructing the vertical cooling airflow path and heat exchanger exposure.
2Reliability
If multiple separate components are used for the extraction arrangement, then functionality can be optimized, but assembly complexity increases
Solution Approach 1:
The axial fan and Venturi nozzle are merged into a single integrated component unit. This combination maintains the functional performance of both the cooling airflow generation and the negative pressure creation for particle extraction, while simultaneously simplifying assembly by reducing the number of separate parts that need to be installed.
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 effectively prevents shading of heat exchangers and maintains heat dissipation efficiency by generating negative pressure without obstructing the cooling air flow, while simplifying the assembly process through integration into a self-contained structural unit.
Implementation Method 1
The cooling airflow passes through the flow tube in the downstream direction of the axial fan in such a way that a negative pressure is created in the intake port
Implementation Method 2
the centrifugal air filter comprises a multitude of individual separators that set the passing airflow into a vortex motion, so that coarse particles contained in the airflow are flung into a separation chamber surrounding the individual separators due to the centrifugal forces generated
Data Source
Figure 1
Figure 2
AI summary
Extraction arrangement (14) for a centrifugal air filter, comprising an axial fan (34) for generating a cooling air flow (38) and a Venturi nozzle (56) with a flow tube (58) and an intake nozzle (60) opening into a constriction region (62) within the flow tube (58), wherein the flow tube (58) is penetrated by the cooling air flow (38) in the outflow direction (64) of the axial fan (34) in such a way that a negative pressure (Δp) is created in the intake nozzle (60).