Rotating Suction Wand for Non-Circular Air Screen Cleaning
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Solution Overview
Problem
Agricultural equipment air screens with non-circular perimeters, such as square or rectangular shapes, face challenges in cleaning due to the inefficiency of existing rotating brush or suction wand systems, which often fail to effectively reach and clean the corners and edges, leading to clogging issues that impede airflow and engine cooling.
Innovation Solution
A suction wand system that rotates about a central axis with radially movable ends to follow the non-circular outer perimeter of the air screen, ensuring thorough cleaning by extending into corners and retracting to clean along sides, utilizing a spring mechanism to maintain effective suction throughout the rotation and ensuring continuous cleaning paths without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a rotating suction wand is used to clean a non-circular air screen, then the cleaning coverage is improved, but the suction efficiency in corners is reduced because suction is not applied at the location swept by the accessory brush
Solution Approach 1:
The patent combines the brush cleaning function and suction function into a single integrated wand assembly. The brush elements and suction inlet are positioned together on the same radial arm, ensuring that both mechanical brushing and vacuum suction occur simultaneously at the same location, particularly in the corners of the non-circular air screen.
Solution Approach 2:
The radial arm acts as an intermediary structure that extends the suction capability into the corners of the non-circular air screen. By positioning the suction inlet at the distal end of the radial arm, the system can reach areas that would otherwise be inaccessible to a simple rotating wand, while still maintaining effective suction through the integrated design.
2Quantity of substance
If additional cooling openings and screens are provided around a round screen to increase airflow, then the cooling capacity is improved, but the device complexity and cleaning difficulty increase
Solution Approach 1:
The patent transitions from a symmetric circular screen design to an asymmetric non-circular (square or rectangular) screen configuration. This asymmetric shape allows for increased airflow area without proportionally increasing the perimeter that requires cleaning, as the rotating wand with radial arms can efficiently clean all surfaces including corners of the non-circular geometry.
Solution Approach 2:
The patent introduces a dynamic rotating cleaning mechanism with movable radial arms that can extend and retract. This dynamic system allows the cleaning wand to adapt its reach to the non-circular geometry of the screen, ensuring complete coverage of all surfaces while maintaining a relatively simple overall structure that can be driven by a single motor.
3Area of stationary object
If a rectangular screen is cleaned by a brushbar that reciprocates back and forth, then the cleaning coverage is improved, but the device complexity, weight, and cost increase
Solution Approach 1:
Instead of using a complex reciprocating brushbar mechanism that moves back and forth across the screen, the patent inverts the approach by using a rotating wand that sweeps across the screen in a circular motion. This rotation-based approach naturally covers the entire screen surface including corners, eliminating the need for complex reciprocating mechanisms, multiple brushes, and associated drive systems.
Solution Approach 2:
The rotating wand assembly serves multiple functions simultaneously: the brush elements provide mechanical cleaning, the suction inlet provides vacuum removal of debris, and the radial arm structure provides extended reach into corners. This multi-functional design achieves comprehensive cleaning coverage while maintaining a simple, lightweight, and cost-effective mechanism driven by a single motor.
4Area of stationary object
If a square screen is cleaned by two wipers at opposite corners operating sequentially, then the cleaning coverage is improved, but the device complexity increases and redundant cleaning occurs
Solution Approach 1:
The patent merges multiple cleaning functions into a single rotating wand assembly. Instead of using two separate wiper mechanisms at opposite corners, one integrated wand with brush elements and suction capability rotates to clean the entire screen surface in a single continuous motion, eliminating redundant cleaning passes and reducing mechanical complexity.
Solution Approach 2:
The rotating wand provides continuous cleaning action as it sweeps across the screen surface. The rotational motion ensures that every part of the screen, including corners and edges, is continuously engaged by the brush and suction elements during a single rotation cycle, eliminating the intermittent operation and redundant passes required by sequential wiper systems.
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 system provides efficient and comprehensive cleaning of non-circular air screens, maintaining airflow and engine cooling efficiency by ensuring all areas of the screen are cleaned, reducing debris accumulation and clogging, and is designed to be adaptable and cost-effective.
Implementation Method 1
a suction wand operatively connected to the motor and located on an upstream side of the screen
Data Source
Figure 1A~3B
Figure 4~5B
Figure 6A~7
AI summary
An agricultural equipment air screen cleaning assembly having a frame having an airflow opening having a non-circular outer perimeter, a screen mounted to the frame within the airflow opening and extending to the non-circular outer perimeter, a motor, and a suction wand operatively connected to the motor and located on an upstream side of the screen. The suction wand is rotatably connected about a rotation axis at a central region of the screen, and includes: at least one distal end that is movable in a radial direction with respect to the rotation axis to follow the non-circular outer perimeter as the suction wand rotates about the rotation axis, one or more inlet openings facing the screen, and an internal suction flow path in fluid connection with the one or more inlet openings, the suction flow path extending from a manifold to the distal end of the suction wand.