Farm Cabin Ventilation Isolation During Spraying
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Solution Overview
Problem
Agricultural machine cabins involved in spraying operations face contamination from phytosanitary products, leading to operator safety risks and frequent filter clogging due to the circulation of polluted air within the ventilation system.
Innovation Solution
A ventilation system with selectively controlled air intakes and recycling inlets that automatically isolate the cabin during spraying operations, using a single valve to manage air intake and recycling, ensuring clean air entry and preventing polluted air from entering the cabin, and allowing for quick air evacuation when spraying is deactivated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ventilation system circulates air from outside air intake through the cabin during spraying operations, then the cabin is ventilated, but the operator is exposed to polluted air containing phytosanitary products and filters clog quickly
Solution Approach 1:
The system applies preliminary anti-action by detecting the spraying operation state and proactively closing the outside air intake before polluted air can enter the cabin. The control unit receives signals from the spraying control unit and actuates the closing means to seal the air intake, preventing contamination before it occurs. This anticipatory measure protects the operator without requiring manual intervention.
Solution Approach 2:
The invention introduces an intermediary control system that mediates between the spraying operation and the ventilation system. The control unit acts as an intermediary, receiving information from the spraying control unit and automatically adjusting the ventilation system's air intake based on the spraying state. This intermediary layer ensures that the ventilation system responds appropriately to spraying conditions without operator intervention.
2Productivity
If the ventilation system operates with outside air intake during spraying, then air circulation is maintained, but filters clog up quickly requiring frequent changes
Solution Approach 1:
The system prevents filter clogging by proactively closing the outside air intake when spraying operations are detected. The control unit receives signals from the spraying control unit and actuates the closing means to seal the air intake before polluted air containing phytosanitary products can reach and clog the filters. This preliminary protective action maintains filter efficiency and reduces replacement frequency.
3Reliability
If the air intake is automatically closed during spraying operations, then operator protection is improved, but the system complexity increases
Solution Approach 1:
The invention introduces an intermediary control system that mediates between the spraying operation and the ventilation system. The control unit acts as an intermediary, receiving information from the spraying control unit and automatically adjusting the ventilation system's air intake based on the spraying state. This intermediary layer ensures that the ventilation system responds appropriately to spraying conditions without operator intervention.
Solution Approach 2:
The ventilation system performs self-service by automatically adjusting its own operation based on spraying conditions. The control unit monitors the spraying state and autonomously actuates the closing means to seal the air intake when spraying is active, without requiring manual intervention from the operator. This self-regulating capability simplifies the user interface while maintaining protection reliability.
4Device complexity
If a single valve is used to selectively close both air intake and recycling inlet, then device complexity is reduced, but control precision may be compromised
Solution Approach 1:
The invention applies universality by using a single closing means that performs multiple functions: it can selectively close both the outside air intake and the recycling inlet depending on the operational mode. The closing means is designed to respond to control signals that determine whether to seal the outside air intake during spraying operations or the recycling inlet during normal ventilation, thereby reducing the total number of components while maintaining control precision through intelligent actuation.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A control circuit (13) causes air coming from the outside air intake (7) to flow towards the air outlet (29). A flap (11) selects the closing of the outside air intake. A handle (21) controls the spraying function. Flap is slaved to handle in such a manner that activating and deactivating the spraying function leads respectively to the air intake being closed and opened by the flap. A filter complex (9) filters the incoming air from the outside air intake. Heating and cooling heat exchangers (15,17) modify the temperature of the air. A recycling inlet (19) recycles the air in the cab (1). An independent claim is included for an agricultural machine involved in spraying operations.