Seed Metering Air Recirculation for Disinfectant Control
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Solution Overview
Problem
Agricultural machines used for sowing crops release seed disinfectant into the air as a dust, posing environmental hazards due to the use of pneumatic systems, and there is a need to minimize air pollution and ensure the disinfectant is deposited directly into the soil to prevent its spread.
Innovation Solution
In the agricultural machines, a significant portion of the fan air is redirected back to the seed metering system or down into the soil, rather than being exhausted into the atmosphere, using a combination of return lines and pneumatic devices to manage air flow and temperature, thereby reducing air contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air is exhausted into the free air after passing through the pneumatic device, then the air can be continuously circulated, but the disinfectant is released into the environment causing pollution
Solution Approach 1:
The patent recovers the air that has passed through the pneumatic device by redirecting it back to the inlet side through a return line, rather than discarding it into the environment. This closed-loop system allows the air to be reused multiple times, maintaining productivity while preventing disinfectant release into the environment.
Solution Approach 2:
The patent converts the potentially harmful contaminated air into a beneficial resource by redirecting it back through the system. The air that would normally be discarded as waste (carrying disinfectant) is instead recovered and reused, transforming an environmental hazard into a sustainable operating resource.
2Object-generated harmful factors
If air is directed down into the ground, then the disinfectant is deposited into the soil, but the air volume and speed must be limited to prevent whirling up
Solution Approach 1:
The patent carefully controls the parameters of air flow (volume and speed) when directing air into the ground. By adjusting these parameters to remain below threshold values, the system achieves disinfectant deposition without causing air to whirl up and spread contamination, thus managing complexity through precise parameter control.
3Duration of action of stationary object
If air is repeatedly passed through the pneumatic device, then the system operates continuously, but the air temperature increases and disinfectant concentration rises
Solution Approach 1:
The patent maintains continuous operation by creating a closed-loop air circulation system where air is constantly reused. The air that exits the pneumatic device is redirected back through the return line to the inlet side, allowing uninterrupted operation while managing temperature and concentration through controlled circulation rather than continuous discharge and recharge.
4Object-generated harmful factors
If a return line is added to redirect air, then air pollution is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the return line with the existing air line system, integrating the pollution control function into the existing pneumatic structure. The return line connects the outlet side back to the inlet side, creating a unified closed-loop system that reduces pollution without requiring entirely separate infrastructure.
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 approach significantly decreases the amount of contaminated air discharged into the environment, ensuring that the seed disinfectant is deposited directly into the soil, minimizing its release into the air and reducing environmental impact.
Implementation Method 1
a pressure difference between a seed reception side, high-pressure side, of the wall and a side, low-pressure side, of the wall that is opposite the seed reception side
Implementation Method 2
an air current is directed to the usually central fan of the machine... compels the seed grains via a line down into the soil
Implementation Method 3
a pneumatic device, which provides a main air current through an air line in the direction of the seed reception side of the wall
Data Source
Figure 1
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Figure 3
AI summary
An agricultural machine (1 ) comprising a seed metering device (8) to meter seeds (91 ) for the distribution to the ground across which the agricultural machine moves. The seed metering device (8) embraces a wall (803a, 903a) that is arranged to rotate. The seed metering device is furthermore arranged to communicate with a pressure actuating appliance (500, 501, 502, 503, 504, 505, 507, 5030, 5031 ) for providing a wall pressure difference between a seed reception side, high-pressure side, of the wall (803a, 903a) and a side, low- pressure side, of the wall that is opposite the seed reception side. The wall is provided with a plurality of through retention openings (804, 904) for the reception on the seed reception side of the wall (803a, 903a), by means of the wall pressure difference, of seeds (91 ) at the retention openings (804, 904). Then, the seeds are transported, by means of the rotation of the wall (803a, 903a), through a wall transportation distance whereupon they are released from the wall. The pressure actuating appliance comprises a pneumatic device (501 ) connected to an air line (502), which device provides a main air current through the air line (502) toward the seed reception side of the wall (803a, 903a). A return line (505) is connected between the side of the wall (803a, 903a) that is opposite the seed reception side and the pneumatic device (501 ), in which return line a part of the main air current is arranged to be brought back to the air line (502) and/or to an inlet side of the pneumatic device (501 ), while a part of the main air current is arranged to be directed down into the ground through a dump line (500).