Slit Nozzle Protrusions for Can Body Drying Efficiency
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Solution Overview
Problem
Existing drying devices for can bodies face inefficiencies in drying due to intermittent impinging jets and unstable flow patterns, leading to reduced drying efficiency and increased energy consumption, particularly when the interval of slit nozzles is either larger or smaller than the can's outer diameter.
Innovation Solution
A nozzle design with slit-shaped discharge ports and protrusions on nozzle walls, arranged to face each other at a predetermined interval, which improves the rectilinearity of the discharged gas, allowing for continuous and efficient drying by aligning the longitudinal direction of the discharge port parallel to the conveying direction, and varying the shape and ratio of protrusions in different zones to optimize gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the interval of slit nozzles is larger than the can's outer diameter, then the device complexity is reduced, but the drying efficiency decreases due to intermittent impinging jets
Solution Approach 1:
The patent transitions from a static nozzle arrangement to a dynamic one where the longitudinal direction of the discharge port is aligned parallel to the conveying direction. This dynamic alignment ensures that the gas flow continuously impinges on the can body surface as it moves through the drying device, maintaining drying efficiency without requiring complex multi-row nozzle arrangements.
Solution Approach 2:
The patent changes the orientation parameter of the discharge port from a transverse arrangement (orthogonal to conveying direction) to a longitudinal arrangement (parallel to conveying direction). This parameter change transforms the impinging jet pattern from intermittent to continuous, improving drying efficiency while simplifying the nozzle arrangement.
2Productivity
If the interval of slit nozzles is smaller than the can's outer diameter, then the drying efficiency improves with more frequent impinging jets, but the device complexity increases
Solution Approach 1:
Instead of increasing nozzle density, the patent employs a dynamic alignment strategy where the discharge port's longitudinal direction parallels the conveying direction. This creates a continuous impinging jet effect that covers the entire can body surface without requiring multiple closely-spaced nozzles, thus improving drying efficiency while avoiding increased device complexity.
Solution Approach 2:
The patent changes the orientation parameter of the discharge port to be parallel to the conveying direction, which transforms the flow pattern into a continuous impinging jet. This single parameter change achieves the drying efficiency of multiple nozzles while using only one nozzle, thereby reducing rather than increasing device complexity.
3Productivity
If protrusions are added to the nozzle walls to improve gas rectilinearity, then the drying efficiency increases, but the manufacturing complexity increases
Solution Approach 1:
The protrusions are positioned at the tip ends of the nozzle walls, creating a preliminary flow conditioning structure before the gas exits the discharge port. This preliminary action of the protrusions organizes the gas flow into a more rectilinear pattern, enhancing the impinging jet effect and drying efficiency without requiring complex internal nozzle geometry.
Solution Approach 2:
The patent applies protrusions only at specific locations (tip ends of nozzle walls) rather than throughout the entire nozzle structure. This localized modification improves gas rectilinearity and drying efficiency while minimizing the impact on manufacturing complexity, as only specific regions of the nozzle require the protrusion feature.
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 improved nozzle design enhances the rectilinearity of the discharged gas, allowing it to travel straight into the can body, thereby increasing drying efficiency and improving the quality of the coating film on the inner surface of the can body while reducing energy consumption.
Implementation Method 1
A nozzle design with slit-shaped discharge ports and protrusions on nozzle walls, arranged to face each other at a predetermined interval, which improves the rectilinearity of the discharged gas
Implementation Method 2
an impinging jet in which the gas discharged from the slit nozzle 117 is blown into the can is adopted in an area where the slit nozzle 117 is arranged
Implementation Method 3
In the preheating zone 106, water and solvents are evaporated at approximately 100° C.
Implementation Method 4
natural convection heat transfer is adopted in an area where the slit nozzle 117 is not arranged
Data Source
AI summary
A nozzle includes a slit-shaped discharge port at tip ends of a pair of nozzle walls arranged to face each other at a predetermined interval and a plurality of protrusions protruding toward the facing nozzle walls at tip end sides of the nozzle walls.