Rigid Plate Check Valve for Agricultural Vehicle Cabin Venting
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Solution Overview
Problem
Existing agricultural vehicle venting systems face issues with reliability and air flow efficiency due to flexible check valves that can be easily displaced, leading to incomplete sealing and increased noise and fuel consumption when trying to maintain sufficient air flow.
Innovation Solution
A rigid plate check valve that is either fully closed or fully open, ensuring complete sealing and reliability, with the plate's weight or a magnet providing consistent force, and a design that allows for easy cleaning and accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flexible rubber flap check valve is used, then the valve can be easily displaced by positive pressure to allow air flow, but the sealing reliability deteriorates because small forces can displace the flap and moderate wind can press outside air through
Solution Approach 1:
The patent changes the physical state and mechanical properties of the closing member from flexible (rubber flap) to rigid (plate). This parameter change ensures that the closing member cannot be easily displaced by small forces or moderate wind pressure, thereby maintaining reliable sealing while still allowing air flow when needed.
Solution Approach 2:
The patent uses a composite structure consisting of a rigid plate closing member in combination with a resilient member (spring or magnet). This composite design provides both the rigidity needed for reliable sealing and the responsiveness needed for automatic opening when positive pressure occurs inside the cabin.
2Productivity
If the operating power of fresh air supply means is increased to increase fresh air flow, then the air flow improves, but fuel consumption and noise level increase substantially
Solution Approach 1:
The patent implements a self-regulating check valve system that automatically opens when positive pressure occurs inside the cabin during normal operation. This eliminates the need for continuous powered operation of fresh air supply means, allowing the system to service itself by utilizing the pressure differential that naturally occurs during vehicle operation.
Solution Approach 2:
The check valve operates periodically based on pressure conditions rather than continuously. It remains closed during normal conditions and opens only when positive pressure occurs, creating a periodic action pattern that reduces energy consumption compared to continuous operation.
3Productivity
If the operating power of fresh air supply means is increased to increase fresh air flow, then the air flow improves, but the noise level in the driver cabin increases
Solution Approach 1:
The check valve system provides self-service by automatically responding to pressure conditions, eliminating the need for continuous powered operation that generates noise. The mechanical operation of the check valve is significantly quieter than continuous operation of powered air supply systems.
4Adaptability or versatility
If a flexible flap check valve is used, then the valve can respond to pressure changes, but the sealing reliability deteriorates over time due to flexibility decrease and bending in rest position
Solution Approach 1:
The patent changes the closing member from flexible material that degrades over time to a rigid plate that maintains its mechanical properties. The rigid plate does not suffer from flexibility decrease or permanent bending, ensuring consistent sealing reliability throughout the service life of the vehicle.
Solution Approach 2:
The patent replaces the flexible rubber flap mechanical system with a rigid plate system assisted by a resilient member (spring or magnet). This substitution eliminates the degradation issues inherent in flexible materials while maintaining the pressure-responsive functionality through the combination of rigid plate and resilient member.
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 solution provides reliable air tightness and efficient air flow without excessive noise or fuel consumption, maintaining consistent sealing over time and reducing the risk of ambient air ingress.
Implementation Method 1
at least part of the force that urges the plate against its seat will be due to the weight of the plate
Implementation Method 2
a magnet providing consistent force
Data Source
Figure 1~2
AI summary
An agricultural vehicle (1) has a driver cabin (2), means for supplying fresh air to the driver cabin (2) and an exhaust air path (27, 26, 18) from the driver cabin (2) into the open. The exhaust air path (27, 26, 18) comprises a check valve (22, 23) for preventing air flow from the open into the cabin, and the check valve (22, 23) has a rigid plate (22) for closing member.