Spray Gun Friction Reducing Layer for Tube Durability
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Solution Overview
Problem
Conventional spraying guns experience reduced durability due to high friction between the outer and inner fluid transmission tubes, leading to frequent parts replacement.
Innovation Solution
A spraying device with a rotatable outer fluid transmission tube and an inner fluid transmission tube, featuring a friction reducing layer made of low friction coefficient material, such as polytetrafluoroethylene, to minimize contact between the tubes and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inner transmission tube is made flexible to enable bending with rotation of the outer tube, then uniform spraying distribution in every direction is achieved, but the tube is worn down or broken due to friction with the outer tube, reducing durability
Solution Approach 1:
A friction reducing layer is introduced as an intermediary component between the inner transmission tube and the outer transmission tube. This layer is made of low friction coefficient material (such as PTFE) and is provided on the outer surface of the inner tube or inner surface of the outer tube, reducing direct friction contact and wear while allowing the inner tube to remain flexible for uniform spraying distribution.
Solution Approach 2:
The friction coefficient parameter is changed by applying a friction reducing layer with low friction coefficient material (such as PTFE with friction coefficient of 0.04-0.10) on the contact surface between the inner and outer transmission tubes. This parameter change significantly reduces the friction force, thereby reducing wear and improving durability while maintaining the flexibility needed for uniform spraying.
2Device complexity
If the inner transmission tube directly contacts the outer transmission tube during rotation, then structural simplicity is maintained, but friction force increases leading to frequent parts replacement
Solution Approach 1:
The friction reducing layer serves as a thin intermediary film that does not significantly increase structural complexity but effectively reduces friction force between the inner and outer transmission tubes. This layer prevents wear and breakdown, ensuring continuous operation and reducing parts replacement frequency.
3Adaptability or versatility
If the outer transmission tube is made rotatable for uniform spraying, then spraying coverage is improved, but friction between inner and outer tubes increases causing wear
Solution Approach 1:
The friction coefficient parameter is modified by applying a friction reducing layer made of low friction material (such as PTFE) on the contact surface between the inner and outer transmission tubes. This parameter change reduces the friction force generated during rotation, allowing the outer tube to rotate for improved spraying coverage while minimizing wear on the inner tube.
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 solution significantly enhances the durability of the inner transmission tube by reducing friction, thereby decreasing the frequency of parts replacement and improving the device's operational longevity.
Implementation Method 1
a friction reducing layer, made of a material having a low friction coefficient, is provided between the outer fluid transmission tube and the inner fluid transmission tube
Implementation Method 2
When the high pressure fluid is sprayed out of the outer transmission tube, Venturi effect is induced at an outlet of the inner transmission tube, it makes a spraying liquid be sprayed out from the inner transmission tube
Data Source
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AI summary
A spraying device (100) includes a rotatable outer fluid transmission tube (2) and an inner fluid transmission tube (3) disposed in the outer fluid transmission tube (2). A friction reducing layer (4), rotated together with the outer fluid transmission tube (2), is provided between the outer fluid transmission tube (2) and the inner fluid transmission tube (3). The friction reducing layer (4) is made of a material having a low friction coefficient and has a smooth inner wall surface, so as to make a friction force between the friction reducing layer (4) and the inner fluid transmission tube lower (3) and improve the durability of the inner fluid transmission tube. (3)