Paint Nozzle Bearing Isolation for Ignition-Safe Precision Spraying
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Solution Overview
Problem
In automobile painting processes, existing paint discharging nozzles are prone to ignition due to vaporized paint entering the driving mechanism, leading to potential fires, especially when using piezoelectric elements, which compromises safety and efficiency.
Innovation Solution
A paint discharging nozzle design featuring a needle valve with a linear guide bearing that slides axially, isolating the paint chamber from the driving mechanism and preventing vaporized paint ingress, using a piezo-element connected to the needle valve and O-rings to maintain pressure and prevent leakage, with a configuration that distributes grease to prevent drying and supports the needle valve's rectilinearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a needle valve is used to control paint discharge, then painting precision is improved, but vaporized paint enters the driving mechanism causing ignition risk
Solution Approach 1:
The nozzle is divided into separate functional zones: a paint discharge section with the needle valve for precise control, and a driving mechanism section with the piezoelectric element. The bearing acts as a separator that prevents vaporized paint from the paint chamber from reaching the driving mechanism, thus maintaining painting precision while eliminating ignition risk.
Solution Approach 2:
A bearing is introduced as an intermediary component between the needle valve and the piezoelectric element. This bearing supports the needle valve's movement while creating a physical barrier that blocks vaporized paint from entering the driving mechanism, thereby resolving the contradiction between precision control and ignition prevention.
2Device complexity
If the needle valve is fixed in position, then structural simplicity is improved, but painting accuracy deteriorates due to inability to adjust spray pattern
Solution Approach 1:
The needle valve is designed to be movable along the axial direction rather than fixed, allowing it to adjust its position to control the spray pattern and painting accuracy. The bearing supports this dynamic movement while maintaining structural simplicity through a straightforward linear guidance mechanism.
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 effectively prevents ignition in the paint chamber by isolating it from potential sparks in the driving mechanism, ensuring safer and more accurate paint application without the need for masking, enhancing work efficiency in 2-tone painting processes.
Implementation Method 1
a piezoelectric element, which is a type of driving mechanism
Implementation Method 2
a bearing disposed to surround the needle valve within the housing to be in sliding contact with a peripheral surface of the needle valve
Data Source
AI summary
A disclosed paint discharging nozzle is designed for discharging paint supplied at a predetermined pressure. The paint discharging nozzle includes a housing having a nozzle hole through which paint is discharged; a paint chamber configured to supply paint to the nozzle hole; a needle valve retractably or advancingly fitted into the housing to close or open the nozzle hole; a driving mechanism disposed in the housing and configured to cause the needle valve to perform a retracting or advancing operation with respect to the nozzle hole; and a bearing disposed to surround the needle valve within the housing to be in sliding contact with a peripheral surface of the needle valve as the retracting or advancing operation of the needle valve is performed, wherein the bearing is movable in an axial direction of the needle valve.