Adjustable Spray Nozzle Groove Positioning
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Solution Overview
Problem
Existing spray guns face challenges in positioning the groove portions of the coating material nozzle accurately, leading to inconsistencies in the spray pattern, which affects the desired elliptical distribution of the coating material.
Innovation Solution
The spray gun design includes a coating material nozzle with adjustable groove portions, allowing for precise positioning around the central axis through a combination of first and second nozzles connected via thread grooves and fasteners, enabling the groove portions to be adjusted after mounting to achieve various spray patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coating material nozzle is mounted to the gun main body using a thread groove and internal thread groove connection, then the nozzle can be securely fixed, but positioning error occurs due to machining fluctuation making it impossible to position the groove portions to the desired position
Solution Approach 1:
The coating material nozzle is divided into a first nozzle and a second nozzle that can be adjusted relative to each other. The first nozzle contains the groove portions and can be rotated independently around the central axis, allowing positioning adjustment without affecting the secure fixation provided by the second nozzle's thread connection to the gun main body.
Solution Approach 2:
The first nozzle is made rotatable relative to the second nozzle, transforming a static fixed connection into a dynamic adjustable connection. This allows the groove portions to be positioned at desired angles after mounting, while the threaded connection maintains secure fixation.
2Ease of manufacture
If the groove portions are fixed in position during manufacturing, then production is simplified, but the spray pattern cannot be optimized for different applications
Solution Approach 1:
The first nozzle can be rotated around the central axis to adjust the angular position of the groove portions, enabling different spray patterns (flat, center thick, or center thick to flat) while maintaining a simple manufacturing process where groove portions are fixed during production.
Solution Approach 2:
The angular position parameter of the groove portions can be changed by rotating the first nozzle relative to the second nozzle, allowing optimization of spray patterns for different coating applications without changing the nozzle structure or manufacturing process.
3Manufacturing precision
If the groove portions are positioned incorrectly due to machining fluctuation, then the desired elliptical spray pattern cannot be formed, but redesigning the mounting structure increases complexity
Solution Approach 1:
Dividing the nozzle into two adjustable sections allows positioning correction without redesigning the entire mounting structure. The first nozzle can be rotated to compensate for positioning errors while the second nozzle maintains the simple threaded connection to the gun main body.
Solution Approach 2:
The rotatable connection between the first and second nozzles provides a simple dynamic adjustment mechanism that corrects positioning errors without requiring complex mounting structures or precision machining.
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 design allows for flexible adjustment of the spray pattern from flat to center thick or center thick to flat, ensuring accurate positioning of the groove portions relative to the air cap's side air holes, resulting in a consistent and desired spray distribution.
Implementation Method 1
the compressed air increases in gas-liquid contact area while passing through the groove portions, and then mixes with the ejected coating material by collision
Implementation Method 2
The compressed air introduced from the gun main body is ejected through the side air holes so that the compressed air intersects with the coating material ejected from the coating material ejection opening
Data Source
Figure 1
Figure 2A~2C
Figure 3~4
AI summary
Disclosed is a spray gun, comprising a gun main body 1, a coating material nozzle 30 attached to a gun barrel part 2 of the gun main body and formed with at least one groove portions 15 on a tip end portion having a coating material ejection opening 30A; and an air cap 16 disposed surrounding the coating material ejection opening of the coating material nozzle, introducing air to the at least one groove portion 15 of the coating material nozzle, and having a side air hole 19 for ejecting air to intersect with coating material ejected from the coating material ejection opening of the coating material nozzle, wherein the coating material nozzle is configured to adjust a position of the at least one groove around a central axis thereof at least at the tip end portion thereof.