Liquid Feeding Device for Flame Spraying Apparatus
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Solution Overview
Problem
Conventional liquid feeding systems in flame spraying face challenges with accurate pressure control and constant flow, often resulting in pressure fluctuations, leakage, and complexity in determining liquid levels, especially when high pressures are used or when relying on height differences for pressure standardization.
Innovation Solution
A liquid feeding device utilizing a pressure generating part with a tubular shape, where pressure is generated by gravity through a height difference, ensuring a constant pressure level and flow, and incorporating a dosing part with reduced pressure exertion, allowing for balanced liquid composition and bubble removal before spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a pump is used to generate liquid pressure, then the liquid can be supplied at high pressure, but pressure fluctuations and leakage occur
Solution Approach 1:
The liquid supply system is divided into two independent parts: a dosing part that supplies liquid at low pressure and a pressure generating part that converts this low-pressure liquid into high-pressure spray. This segmentation allows each part to perform its function optimally without the drawbacks of using a pump throughout the entire system.
Solution Approach 2:
The invention introduces an intermediary conversion process where liquid pressure is generated not by direct pumping but through the conversion of gas pressure (from hydrogen flow) into liquid pressure via the ejector phenomenon. This intermediary mechanism provides stable high pressure without the fluctuations associated with direct pump operation.
2Stress or pressure
If liquid pressure is based on height difference, then pressure can be standardized, but the structure becomes complex and real-time weight determination is difficult
Solution Approach 1:
The invention extracts the pressure generation function from the complex height-adjustment mechanism. Instead of using a movable container to maintain constant height, the pressure is generated in a stationary pressure generating part through the ejector phenomenon, simplifying the overall structure while maintaining pressure standardization.
3Productivity
If liquid flows through capillaries at high pressure, then spraying efficiency improves, but yielding and leakage occur in piston-type solutions
Solution Approach 1:
The system separates the high-pressure spray function (in the pressure generating part with capillaries) from the liquid supply function (in the dosing part). The dosing part operates at low pressure where reliability is maintained, while the pressure generating part handles high pressure only where needed for efficient spraying, avoiding the durability issues of piston-type feeders.
4Stress or pressure
If liquid flow is throttled to control pressure, then pressure control improves, but cavitation increases
Solution Approach 1:
Instead of directly throttling liquid flow to control pressure (which causes cavitation), the invention uses gas flow (hydrogen) as an intermediary. The gas flow creates the ejector phenomenon that indirectly controls liquid pressure and flow rate, avoiding direct liquid throttling and the associated cavitation problems.
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 solution provides a reliable and simple method for maintaining constant pressure and flow in flame spraying, ensuring uniform spraying results and reducing the complexity and durability issues associated with conventional systems.
Implementation Method 1
By means of said structure is it possible to utilize earth's gravity to attain such a pressure in the liquid that is proportional to the density of the liquid and to the height difference of the liquid pillar
Implementation Method 2
The flow of hydrogen generates an ejector phenomenon, which, in turn, brings about the absorption of liquid out of the channel, and spraying of said liquid to the gas flow
Data Source
AI summary
A method and a liquid feeding device for feeding liquid in a flame spraying apparatus that is arranged for treating an optical fiber structure, as well as a flame spraying apparatus in which liquid feeding is arranged according to the invention. Liquid is supplied to an unpressurized space in a pressure generating part substantially in a constant flow. In the pressure generating part the pressure of liquid is generated by means of gravity influencing the liquid, and the pressurized liquid is arranged to be supplied to the flame spraying at a substantially constant pressure and at a constant flow rate.