Venturi Element for Engine Air Pre-cleaner Evacuation
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Solution Overview
Problem
Existing solutions for removing dust and particles from air pre-cleaners in work machines, such as agricultural harvesting machines, face issues like fire hazards, instability in aspiration, and reduced aspirator fan efficiency due to the mixing of particle streams with debris from the cooling air, which can cause damage to the fan and housing.
Innovation Solution
A venturi element is mounted downstream of the aspirator fan and connected to the outlet of the engine air pre-cleaner, creating a suction effect that attracts particles from the pre-cleaner without mixing them with the debris stream, thus preventing damage and maintaining aspirator performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particles from the pre-cleaner are joined with the debris stream from the radiator upstream of the aspirator fan, then the fire hazard is removed and aspiration stability is improved, but the efficiency of the aspirator fan is reduced and damage to the fan and housing occurs due to hard particles
Solution Approach 1:
The invention separates the particle removal function from the cooling air debris removal function by providing a dedicated particle removal aspirator that draws particles from the pre-cleaner outlet independently, rather than mixing both streams together. This segmentation allows each aspirator to be optimized for its specific function without interference.
Solution Approach 2:
The invention extracts the particle removal function from the combined stream approach and creates a separate extraction path. The dedicated particle removal aspirator extracts particles directly from the pre-cleaner outlet, preventing them from contacting the cooling air debris stream and the main aspirator fan, thus protecting the fan while maintaining efficient particle removal.
2Object-affected harmful factors
If a venturi device is used to aspirate particles from the pre-cleaner, then fire hazard is removed, but the joining of particle stream with debris stream reduces aspirator fan efficiency and causes damage
Solution Approach 1:
The system is segmented into two independent aspiration paths: one for cooling air debris removal and another for particle removal from the pre-cleaner. This segmentation prevents hard particles from reaching the main aspirator fan and housing, eliminating the damage mechanism while maintaining fire safety.
Solution Approach 2:
A dedicated particle removal aspirator acts as an intermediary device that handles particle extraction separately. This intermediary prevents direct contact between hard particles and the main aspirator fan, serving as a protective mediator that preserves fan integrity while maintaining effective particle removal.
3Reliability
If multiple fan chambers are provided to separate cooling air debris aspiration and pre-cleaner output aspiration, then fan damage is prevented, but the device complexity increases
Solution Approach 1:
The invention segments the aspiration system into functionally independent units with separate airflow paths. By providing a dedicated particle removal aspirator with its own suction source, the system achieves fan protection without requiring complex multi-chamber configurations, simplifying the overall structure while maintaining reliability.
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 design enhances the aspirator's performance by preventing particle contact with the rotating fan and housing, reducing wear, and allowing for easier modification of existing machines without altering the duct configuration, thereby ensuring efficient and safe particle removal.
Implementation Method 1
a venturi element is mounted downstream of the aspirator fan, said venturi element being connected to the outlet of the engine air pre-cleaner
Data Source
AI summary
A work machine with an internal combustion engine is provided with an air inlet for receiving combustion air, wherein an air pre-cleaner is mounted in the inlet, a radiator, a cooling air fan and a debris removal means, configured to remove debris from a flow of air produced by the cooling air fan through the radiator, the removal means comprising a screen for collecting the debris, and an aspirator for aspirating the debris away from the screen, and a venturi element mounted downstream of the aspirator, and having an inlet portion, a throat portion and an outlet portion, wherein a duct is mounted between the engine air pre-cleaner and the throat portion, so that particles removed by the pre-cleaner flow towards the throat portion, and out through the outlet portion of the venturi element, together with the aspirated debris.