Secondary Header Pinch Valve for Air Seeder Pressure Balancing
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Solution Overview
Problem
Modern air seeders face challenges in maintaining uniform air pressure across multiple fluid lines, leading to inefficiencies and increased production costs due to the need for all lines to be the same length to avoid pressure drops, which can result in excessively long hoses and cluttered seeding units.
Innovation Solution
The implementation of mechanical, pneumatic, or hydraulic pinch valves coupled to the primary and/or secondary headers, which include a flexible tubing and an adjustable constricting member actuated by a motor, allows for the balancing of air pressure across different fluid lines, ensuring even air pressure distribution to each row unit through automatic adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all fluid lines are made the same length to avoid pressure drops, then air pressure uniformity is improved, but fluid line length and production costs increase
Solution Approach 1:
The patent applies dynamics by making the fluid line length variable rather than fixed. Different sections of the fluid line can be extended or retracted depending on the operational requirements, allowing the system to maintain uniform air pressure while using only the necessary length of hose for each specific task.
Solution Approach 2:
The fluid line system is segmented into multiple sections that can be independently adjusted. This segmentation allows each section to be optimized for its specific function and length requirement, rather than requiring all lines to be uniformly long, thus maintaining pressure uniformity without excessive material usage.
2Reliability
If all fluid lines are made the same length to avoid pressure drops, then air pressure uniformity is improved, but device complexity and clutter increase
Solution Approach 1:
The telescoping mechanism allows the fluid lines to dynamically adjust their length based on operational needs. When not in use, the excess length can be retracted, reducing clutter and simplifying the overall device structure while maintaining the capability to achieve uniform air pressure when deployed.
Solution Approach 2:
The telescoping fluid lines utilize a nested structure where inner tubes are housed within outer tubes. This nesting allows the fluid lines to be compact when not in use, reducing clutter on the seeding unit, while still providing the necessary length when extended to maintain uniform air pressure across all lines.
3Device complexity
If a single fan services multiple fluid lines, then system complexity is reduced, but air pressure balance deteriorates
Solution Approach 1:
The telescoping fluid lines provide a dynamic solution that compensates for the fixed output of a single fan. By adjusting the length of individual fluid lines, the system can balance air pressure distribution across multiple lines even when serviced by a single fan, maintaining reliability without increasing fan 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
This solution efficiently and automatically balances individual airstreams within the fluid lines, enhancing the uniformity of seed distribution and reducing production costs by allowing for varying line lengths without pressure drops.
Implementation Method 1
The pinch valves include a flexible tubing, an adjustable constricting member, and an actuator for adjusting the level of constriction of the constricting member. The pinch valves restrict the airstream exiting from the outlet(s) and can balance the airstreams among the various fluid lines such that a substantially even air pressure is provided to each row unit.
Data Source
AI summary
An agricultural implement including a toolbar, a plurality of row units connected to the toolbar, and a pneumatic seeding system. The pneumatic seeding system includes at least one storage tank configured for storing the particulate matter, a plurality of fluid lines fluidly interconnecting the at least one storage tank with each row unit of the plurality of row units, a fan fluidly connected to the at least one storage tank and to the plurality of fluid lines, and at least one pinch valve fluidly coupled to at least one fluid line of the plurality of fluid lines for adjustably balancing a respective airstream within the at least one fluid line of the plurality of fluid lines.