Spray Head Throttling Channel Injection Molding
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Solution Overview
Problem
Existing devices for atomizing cosmetic liquids face challenges in achieving precise throttling actions, especially with pressurized, flammable propellants, due to complex production requirements and the need for different throttling channel cross sections for various liquids, making mass production difficult and economically inefficient.
Innovation Solution
A device with a spray head featuring a second throttle upstream of the nozzle, allowing for high-precision throttling with a radially open throttling channel on the spray head that can be easily produced by injection molding, enabling the use of the same valve for different applications and varying throttling actions without additional mounting steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a throttle with small cross section and diameter is used to achieve strong throttling action, then the throttling precision is improved, but the manufacturing difficulty increases due to tight tolerances
Solution Approach 1:
The invention transitions from controlling throttle precision through radial dimensions (cross-section and diameter) to controlling it through the axial dimension (length of the throttling channel). By forming the throttling channel with a crosspiece in the injection mold, the effective length of the throttle can be precisely controlled in the injection molding direction, which has better tolerance capabilities compared to radial dimensions.
Solution Approach 2:
The invention changes the critical parameter for throttle precision from radial dimensions (diameter and cross-section) to axial dimension (length of throttling channel). This parameter change allows achieving strong throttling action with high precision while maintaining ease of manufacture, as the length can be controlled with better tolerances in injection molding processes.
2Adaptability or versatility
If different throttling channel cross sections are used for different liquids, then the adaptability to various applications is improved, but the device complexity and production cost increase
Solution Approach 1:
The invention makes a single valve design universal for different applications by allowing the throttling channel cross-section to be varied through the choice of crosspiece dimensions rather than requiring different valve designs. The same valve body can accommodate different crosspieces to achieve different throttling characteristics for different liquids.
Solution Approach 2:
The invention enables adaptation to different liquids by changing the parameters of the crosspiece (dimensions, shape) that forms the throttling channel, rather than changing the entire valve design. This allows a single valve mold to produce universally adaptable valves for different applications.
3Manufacturing precision
If a separately movable mandrel is used to produce the throttle, then the throttling precision can be achieved, but the production process becomes more complex
Solution Approach 1:
The invention extracts the complex movable mandrel mechanism from the injection molding process and replaces it with a simple, stationary crosspiece. The crosspiece is directly integrated into the injection mold, eliminating the need for separate movable components while maintaining the ability to produce precise throttling channels.
Solution Approach 2:
The invention uses a stationary crosspiece in the injection mold that directly defines the throttling channel geometry, copying the desired throttle shape into the plastic material during injection. This eliminates the need for complex movable mandrels while achieving the same precision results.
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 simplifies production and mounting, achieves strong throttling actions with high precision, and allows for the use of the same valve across different applications, reducing production complexity and costs while maintaining precise control over flow resistance.
Implementation Method 1
a throttling channel which forms a throttle radially into an axial recess of the connector piece
Implementation Method 2
the tolerances for the throttle or the throttling channel are very small in order to be able to ensure the required or desired throttling action
Data Source
AI summary
A device (1) and a spray head (5) for atomization of a preferably cosmetic liquid and a process for producing such a device are proposed. Very simple and accurate throttling of the liquid flow is achieved in that on the supply connection (14) of the spray head (5) a radially open throttling channel (22) is formed which is radially overlapped at least in sections by a connector piece (17) when the spray head (5) has been slipped on.