Dirt Separator Tangential Inlet for Vehicle Washing
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Solution Overview
Problem
Existing mud separators in vehicle washing systems have low separation performance, leading to high nitrate content in discharged liquid and inefficient settlement of solid particles, due to vertical flows and self-rotation of liquid, which transport sedimented particles back into upper layers.
Innovation Solution
A mud separator design with a tangentially aligned inlet and a horizontally positioned drain in the central region of the sedimentation basin, featuring parallel slats to prevent self-rotation and vertical flows, creating a circumferential flow with decreasing velocity to enhance particle settlement, and a ratio of inlet to outlet cross-sectional areas optimized for extended residence time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the inlet opening is positioned vertically in the upper liquid exchange zone and oriented tangentially to create circumferential flow, then separation performance is improved and vertical flows are prevented, but the device complexity increases due to specific geometric requirements
Solution Approach 1:
The inlet opening is positioned at a specific location (peripheral point in upper liquid exchange zone) with a specific orientation (tangential to circumferential direction) to create localized optimal flow conditions. This local geometric configuration prevents vertical flows at critical locations while maintaining overall system simplicity
Solution Approach 2:
The outlet opening is positioned in the central area at the same vertical level as the inlet, creating a horizontal flow path that maintains equipotential conditions and prevents vertical flow components. This geometric arrangement ensures liquid flows horizontally from inlet to outlet without generating upward or downward movements
2Manufacturing precision
If the inlet and outlet openings are arranged to create horizontal circumferential flow with decreasing velocity, then particle settlement is enhanced and nitrate content is reduced, but the residence time requirement increases the basin volume
Solution Approach 1:
The tangential inlet orientation creates circumferential (curved) flow paths instead of straight linear flow. This curved flow geometry naturally decreases velocity along the circulation path, enhancing particle settlement efficiency without requiring excessive basin volume. The circular/curved flow pattern is more space-efficient than linear alternatives
Solution Approach 2:
The geometric arrangement of inlet and outlet openings self-regulates the flow velocity through the basin. The circumferential flow path from peripheral inlet to central outlet naturally creates decreasing velocity without requiring additional control mechanisms, allowing particles to settle effectively as the liquid slows down along its path
3Manufacturing precision
If the outlet opening is positioned in the central area at the same vertical level as the inlet, then vertical flows are prevented and separation performance is improved, but the outlet cross-sectional area must be smaller creating potential backup issues
Solution Approach 1:
The outlet opening has a smaller cross-sectional area than the inlet, creating an asymmetric flow configuration. This asymmetric design controls the flow pattern by forcing liquid to decelerate as it moves from the larger inlet area through the basin to the smaller outlet area, preventing vertical flows while maintaining operational effectiveness
Solution Approach 2:
The outlet opening dimensions are specifically optimized with a smaller cross-sectional area ratio relative to the inlet. This parameter change creates the desired flow velocity reduction and prevents backup issues by matching the outlet capacity to the reduced flow velocity in the central discharge region
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 design significantly improves separation performance by preventing vertical flows, reducing nitrate content, and ensuring solid particles settle effectively, with simulations showing minimal upward transport of sedimented particles and extended liquid residence time in the sedimentation basin.
Implementation Method 1
the supplied liquid flows tangentially into the sedimentation basin... creating a circumferential flow with decreasing velocity to enhance particle settlement
Implementation Method 2
featuring parallel slats to prevent self-rotation and vertical flows, creating a circumferential flow with decreasing velocity
Implementation Method 3
a ratio of inlet to outlet cross-sectional areas optimized for extended residence time
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention relates to a dirt separator (1), in particular for a vehicle washing system, said dirt separator comprising a sedimentation basin (4) which has a side wall (2) and a bottom (3). The sedimentation basin (4) is divided vertically into a lower sedimentation region (A), an intermediate region (B), and an upper liquid exchange region (C). Moreover, the dirt separator (1) has an inlet (5) for feeding a liquid, that carries solid particles, into the sedimentation basin (4), which inlet has an end section (5.3) comprising an inlet opening (9), the inlet opening (9) being located in the upper liquid exchange region (C) in the vertical direction and opening into the sedimentation basin (4) in a horizontal plane in an edge region (D) of the sedimentation basin (4). Furthermore, the dirt separator (1) has a drain (7) for discharging liquid out of the sedimentation basin (4), which drain has a drain opening (11) which is located in the upper liquid exchange region (C) in the vertical direction. The dirt separator according to the invention is characterised in that the end section (5.3) is oriented such that the liquid being fed flows tangentially into the sedimentation basin (4), and the drain opening (11) is located in a horizontal plane in a central region (E) of the sedimentation basin (4).