Arc-Shaped Capillary Tube for Nozzle-Less Aerosol Spraying
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Solution Overview
Problem
Conventional spray heads with capillary tubes for aerosol tanks face challenges in aligning the capillary tube correctly with conventional fluid exit valves, which affects the spraying mechanism and efficiency.
Innovation Solution
A spray head design that includes a capillary tube extending in an arc shape, guided by outside and inside guides to ensure proper alignment, allowing for nozzle-less spraying and integration with both female and male fluid exit valves, with the capillary tube's dimensions and material selection optimizing pressure drop and flow behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the capillary tube is aligned axially with the fluid exit valve, then the spraying mechanism works correctly, but the design cannot accommodate conventional spray head handling where the exit direction is at a right angle to the axial direction
Solution Approach 1:
The capillary tube is configured in an arc shape instead of a straight line, allowing it to connect the axially aligned fluid exit valve to the laterally oriented spray exit. This curvature enables the tube to follow the 90-degree angle requirement while maintaining axial connection at both ends, resolving the conflict between axial alignment and right-angle exit direction.
Solution Approach 2:
The capillary tube extends in three-dimensional space rather than being confined to a single linear path. By utilizing vertical and lateral dimensions simultaneously, the tube can connect the axial valve to the lateral spray exit, accommodating both the axial fluid exit direction and the right-angle handling requirement.
2Ease of operation
If the capillary tube runs in an arc of 90 degrees, then the exit direction is correct for handling, but the alignment with conventional fluid exit valves becomes difficult
Solution Approach 1:
The spray head is pre-configured with integrated guides during manufacturing that define the exact arc path for the capillary tube. This preliminary setup ensures that when the capillary tube is installed, it automatically follows the correct 90-degree arc trajectory, eliminating alignment difficulties and ensuring precise positioning without requiring complex adjustment procedures.
Solution Approach 2:
Guides are introduced as intermediary elements between the capillary tube and the spray head body. These guides serve as mediating structures that constrain and direct the capillary tube along the desired arc path, making the alignment process simple and ensuring accurate positioning relative to both the fluid exit valve and the spray exit.
3Loss of substance
If conventional spray heads use a tube with a spray nozzle, then the spraying mechanism is well-established, but low-solvent liquid spraying is not achieved
Solution Approach 1:
The spray nozzle component is removed from the system entirely. Instead of using a conventional nozzle to atomize the liquid, the invention relies solely on the capillary tube's internal geometry and pressure differential to achieve nozzle-less spraying. This extraction of the nozzle simplifies the mechanism while enabling low-solvent liquid spraying capability.
Solution Approach 2:
The invention changes the critical parameters of the fluid delivery system by using a capillary tube with specific diameter and length ratios, operating at controlled pressure differentials. These parameter changes enable the system to spray low-solvent liquids effectively without requiring a nozzle, achieving both reduced solvent content and simplified 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
Enables efficient, low-solvent spraying with correct alignment of the capillary tube, maintaining the axial fluid exit direction while accommodating conventional fluid exit valves, enhancing the spraying mechanism and handling of aerosol tanks.
Implementation Method 1
The fluid is introduced under high pressure into a capillary tube with a very small diameter and routed to an exit end from which it is sprayed without a nozzle
Implementation Method 2
Conventional fluid exit valves for aerosol tanks have a valve body which is spring-loaded, to the top and which can be pressed down into the open position against the preliminary tension by the valve spring
Implementation Method 3
The fluid is introduced under high pressure into a capillary tube with a very small diameter
Data Source
AI summary
A spray head for an aerosol tank, and an aerosol tank having a spray head is provided, which includes a fluid exit valve for spraying a low-solvent fluid. The fluid exit valve of the aerosol tank defines an axial fluid exit direction. The spray head includes a capillary tube for routing the fluid and for nozzle-less spraying of the fluid. An entry end of the capillary tube is axially joined to the fluid exit valve when the spray head has been seated on the aerosol tank. An exit end of the capillary tube is open to the ambient atmosphere. In the spray head, the capillary tube runs from the entry end to the exit end in an arc of approximately 90°.