Switchable Valve Suction System for Combine Harvester Dust Control
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Solution Overview
Problem
Existing self-propelled combine harvesters face inefficiencies in space utilization and cleaning performance due to the design of suction systems, which either require additional branches that occupy installation space or shift dust loads to other components, affecting the overall cleaning process.
Innovation Solution
A self-propelled combine harvester with a switchable valve device that allows the suction fan to draw air from outside the process space during temporary interruptions in crop processing, reducing dust and straw particle burden by directing the suction air flow to carry away deposits, and featuring automatic control for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If additional suction channels or branches are installed to reach other areas within the combine, then the extraction capability is improved, but the installation space utilization deteriorates
Solution Approach 1:
The single suction channel is designed to serve multiple functions: it extracts dust during normal operation and serves as an air intake during machine cleaning phases. The switchable valve enables the channel to switch between these functions, allowing one channel to replace what would traditionally require multiple dedicated channels.
Solution Approach 2:
The suction channel's function is made dynamic through the switchable valve, which allows the system to adapt between different operating modes (dust extraction vs. air intake for cleaning). This dynamic switching enables the same physical infrastructure to serve different purposes at different times.
2Object-generated harmful factors
If the control flap is opened to extract dust from other locations, then the extraction capability is improved, but the cleaning performance deteriorates
Solution Approach 1:
The system operates in periodic cycles, alternating between dust extraction mode (with valve closed) and machine cleaning mode (with valve open). During headland turns when processing is interrupted, the valve opens to allow cleaning airflow. This periodic switching ensures that cleaning operations receive sufficient airflow while still enabling dust extraction during normal processing.
Solution Approach 2:
The suction blower operates continuously throughout the harvesting process, but its function changes based on valve position. During normal operation, it extracts dust; during headland turns, it provides cleaning airflow. This continuous operation with functional switching maximizes the utility of the suction system throughout all operating phases.
3Productivity
If machine cleaning is performed during temporary interruptions in crop processing, then the cleaning efficiency is improved, but the system complexity increases
Solution Approach 1:
The combine harvester performs its own cleaning during temporary interruptions in crop processing (such as headland turns). The suction blower and switchable valve work together to automatically create cleaning airflow without requiring separate cleaning equipment or manual intervention, allowing the machine to service itself during otherwise idle periods.
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 enhances cleaning efficiency by utilizing downtime for machine cleaning, reducing dust and straw particle accumulation, and automating the process to maximize utilization of time windows, thereby improving the overall performance and space efficiency of the combine harvester.
Implementation Method 1
a suction blower device (12) downstream of the cleaning device (4), which, on the suction side, draws in a suction air flow (11) through the cleaning device (4)
Implementation Method 2
The process chamber (15) is equipped with at least one switchable valve device (34), which is designed and configured to switch from a closed switching position to an open switching position in an operating situation where, during the operation of the suction blower device (12), the processing of the harvested crop
Implementation Method 3
reducing dust and straw particle burden by directing the suction air flow to carry away deposits
Data Source
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AI summary
The present invention relates to a self-propelled combine harvester (1) comprising a threshing device (2), a separating device (3), a cleaning device (4) and a suction blower device (12) downstream of the cleaning device (4) as working units, which are arranged in a process chamber (15) formed by at least one housing which partially surrounds at least one of the working units, wherein at least one switchable valve device (34) is assigned to the process chamber (15), which is designed and configured to switch from a closed switching position to an open switching position in an operating situation in which, during the ongoing operation of the suction blower device (12), there is a temporary interruption of crop processing by the other working units located in the process chamber (15).