Spraying Head Axial Swirl Channels Simplify Moulding
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Solution Overview
Problem
The existing spraying heads with radial side windows for fluid product dispensing are difficult to mould, leading to manufacturing challenges and inefficiencies.
Innovation Solution
The swirling channels extend axially beneath the central cavity to directly communicate with the central internal duct, eliminating the need for radial side windows and simplifying the moulding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If radial side windows and axial connecting channels are used to connect the central internal duct to swirl channels, then fluid product can be dispensed through the spray nozzle, but the moulding process becomes difficult and complex requiring compartment pins
Solution Approach 1:
The invention extracts and eliminates the radial side windows and axial connecting channels from the moulding structure. Instead of using complex compartment pins to form these separate features, the patent integrates the swirl channels to extend directly to the central internal duct, removing the need for difficult-to-mould radial windows and their associated compartment pins.
Solution Approach 2:
The invention merges the swirl channels directly with the central internal duct by extending the swirl channels axially to meet the duct. This integration eliminates the need for separate radial side windows and axial connecting channels, simplifying the moulding process to require only two axially movable parts without complex compartment pins.
2Manufacturing precision
If compartment pins are used to mould radial side windows, then the spray nozzle can be formed with the required fluid passages, but the moulding becomes difficult and problematic
Solution Approach 1:
The invention removes the compartment pins from the moulding assembly entirely. Instead of using pins to create radial side windows, the design allows swirl channels to extend directly to the central internal duct, forming fluid passages through the natural geometry of axially moving mould halves without requiring additional pin-based features.
3Device complexity
If swirl channels are extended axially to directly communicate with the central internal duct, then the moulding process is simplified to two axial parts, but the swirl channel depth increases significantly
Solution Approach 1:
The invention changes the dimensional approach by extending swirl channels primarily in the axial direction rather than using radial windows. This dimensional shift simplifies the moulding assembly to two axially movable parts, trading increased axial depth for reduced overall complexity and elimination of radial features requiring compartment pins.
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 design enhances the axial flow of the fluid product, resulting in a tighter spray angle, improved penetration into nasal cavities, reduced fluid load losses, and increased consistency of doses dispensed, while allowing for lower actuation speeds and pressures.
Implementation Method 1
the first pin and the second pins having conical surfaces, intended to come into mutual cone-to-cone contact by relative axial movement, so as to form the inclined windows. It must be noted that a cone-to-cone contact makes it possible to avoid any friction of edges of pins during mould release. Naturally, the cone-to-cone contact also makes it possible to avoid any sliding contact of pins against one another.
Implementation Method 2
the fluid product travels through the central internal duct, then radially through the radial side windows, then axially through the axial connecting channels, then radially through the swirl channels, in order to arrive in the swirl chamber in which the fluid product forms a vortex and is finally dispensed through the central spraying opening in the form of a cloud of fine droplets.
Data Source
AI summary
Spraying head having a head body forming a housing having an axis X defining an insertion opening and a substantially flat internal wall through which a central spraying opening extends and a spray nozzle, substantially tubular in shape and axially engaged in the housing of the head body via the insertion opening, the spray nozzle having an inlet that opens into a central internal duct and an external wall defining a central cavity centred on the central spraying opening and a plurality of swirl channels that open tangentially into the central cavity and communicate with the central internal duct. The swirl channels extend axially beneath the central cavity as far as the central internal duct, so as to be in direction communication therewith.