Rectangular Fluid Channel in Switching Valve Housing
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Solution Overview
Problem
Agricultural spraying devices require a compact nozzle carrier with low flow resistance, as existing pneumatically switchable valves are large due to high flow cross-section requirements to minimize losses, and non-pneumatic solutions like drip stops have pressure-dependent nozzle operation issues.
Innovation Solution
A switching valve housing with a valve guide channel and a transverse fluid channel of rectangular cross-section, which reduces flow resistance and allows for a compact design by maintaining guidance while enabling a larger cross-sectional area with reduced height, and a nozzle carrier with a rectangular transverse channel that allows for flexible nozzle switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a circular cross-section is used for the transverse fluid channel, then the flow resistance is reduced, but the height of the channel increases which impairs valve body guidance
Solution Approach 1:
The patent changes the geometric parameters of the transverse fluid channel from a circular cross-section to a rectangular cross-section. This parameter change allows the channel to have a larger cross-sectional area (reducing flow resistance) while maintaining a smaller height (preserving valve body guidance). The rectangular shape with optimized dimensions achieves both low flow resistance and adequate guidance function.
2Reliability
If the transverse fluid channel height is reduced for better valve guidance, then the guidance is improved, but the flow resistance increases
Solution Approach 1:
The patent applies parameter changes by transitioning from a circular to a rectangular cross-section for the transverse fluid channel. This allows independent optimization of height and width dimensions, enabling the channel to provide adequate guidance (sufficient height) while maintaining large flow capacity (large width), thus resolving the contradiction between guidance reliability and flow resistance.
3Loss of energy
If a large cross-sectional area is provided for low flow resistance, then the flow resistance is reduced, but the device size increases
Solution Approach 1:
The patent utilizes dimensional optimization by changing from a circular to a rectangular cross-section. This allows the flow channel to achieve a large cross-sectional area (for low flow resistance) while confining it within a compact height dimension (reducing device footprint). The rectangular geometry enables area expansion in the horizontal plane without proportional increase in vertical height.
Data Source
Figure 1
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Figure 6~7
AI summary
The switching valve housings (24,26) have valve guide channels (46,48), which provide a guide for a valve body. The valve seats (50,52) are arranged at an end of the valve body. The valve body is partially crossed in the position of the fluid cross channel (40). The fluid cross channel has a rectangular cross section. An independent claim is also included for a nozzle carrier for spray devices for agricultural machinery.