Paint Suction Rod Elbow Geometry for Lower Head Loss
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Solution Overview
Problem
Existing liquid paint suction rods impose excessive curvature on flexible tubes, leading to high head loss and requiring more powerful pumps, which is detrimental to paint circulation and ease of use.
Innovation Solution
A suction rod design featuring a rigid upstream tube, a flexible intermediate tube, and a rigid downstream tube with a curved trajectory, minimizing head loss and reducing tube bending, using a manufacturing method similar to the upstream tube to form the downstream elbow, with a curved part shaped like a planar arc of circle, and a connecting nut for secure attachment to the pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an L-shaped bent standard coupler is used to reduce tube bending, then the curvature on the flexible intermediate tube is reduced, but the head loss increases substantially
Solution Approach 1:
The downstream tube is designed with a curved trajectory following a planar arc of circle with a large radius, creating a gradual curve rather than a sharp L-shaped bend. This spherical/curved geometry allows paint to flow smoothly around the bend, reducing both the curvature imposed on the flexible tube and the head loss from abrupt directional changes.
Solution Approach 2:
The invention changes the geometric parameters of the elbow section by defining a specific radius of curvature that is large enough to minimize head loss while still achieving the necessary directional change. The ratio of the tube diameter to the curve radius is controlled to optimize flow characteristics, transforming the sharp 90-degree bend into a gradual arc.
2Device complexity
If a standard rectilinear metal coupler is used, then the pump can be positioned at standard heights, but the flexible intermediate tube experiences strong bending
Solution Approach 1:
The rectilinear coupler is replaced with a curved downstream tube that follows a planar arc trajectory. This curvature allows the tube to gradually change direction, significantly reducing the bending stress on the flexible intermediate tube while maintaining the same functional connection between the pump and paint bucket.
3Loss of energy
If a curved downstream tube with large radius is used to reduce head loss, then paint circulation is improved, but the manufacturing complexity increases
Solution Approach 1:
The downstream tube is formed into a curved trajectory using standard tube bending processes, creating a planar arc of circle. This approach uses conventional manufacturing techniques to produce the curved geometry, avoiding the need for complex custom fabrication while achieving the hydrodynamic benefits of a large radius curve.
Data Source
AI summary
A liquid paint suction rod including an upstream tube, a flexible intermediate tube and a rigid downstream tube, which includes a downstream elbow, the downstream tube delimiting a series of passage sections defining centers constituting a trajectory, the downstream elbow extending along a curved part of the trajectory, along which the passage sections are substantially discoid and have a preferably constant diameter; in order to avoid imposing too great a curve on the intermediate tube while offering a reduced head loss for the paint passing through the rod and while being easy to manufacture, the curved part is in the shape of a planar arc of circle, having a curve radius, the ratio of the diameter to the curve radius being less than 1.