Fluid Dispenser Head with Soft Pre-Compression Spring
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Solution Overview
Problem
Conventional fluid dispenser devices require high actuation force to produce a good quality spray, making them difficult to use, and reducing this force results in poor spray quality, creating a contradictory requirement between ease of use and spray quality.
Innovation Solution
A fluid dispenser device with a pre-compression spring stiffness of less than 3 N/mm and multiple feed ducts connecting the inlet well to the assembly housing, which allows for soft actuation while maintaining excellent spray quality, achieved by feeding swirl channels in a completely symmetrical manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pre-compression spring stiffness is reduced to lower actuation force, then ease of operation is improved, but spray quality deteriorates
Solution Approach 1:
The invention divides the single feed path into multiple separate feed ducts (at least two) that connect the inlet well to the assembly housing. This segmentation allows the fluid to be distributed through multiple pathways, maintaining spray quality even with reduced actuation force from a softer pre-compression spring (stiffness <3 N/mm).
Solution Approach 2:
The invention changes the physical parameter of spring stiffness from conventional values (about 6 N/mm) to a lower value (less than 3 N/mm, preferably about 2 N/mm). This parameter change reduces the actuation force required while the multiple feed ducts compensate to maintain spray quality.
2Manufacturing precision
If high actuation force is applied to achieve good spray quality, then spray quality is improved, but ease of operation deteriorates
Solution Approach 1:
By segmenting the feed system into multiple ducts, the invention enables the use of a softer spring (lower actuation force) while maintaining spray quality. The multiple pathways ensure proper fluid distribution without requiring high compression force.
Solution Approach 2:
The invention uses a pre-compression spring with stiffness at the lower boundary of the acceptable range (less than 3 N/mm, preferably about 2 N/mm), which is softer than conventional springs. The multiple feed ducts compensate for the reduced spring force to achieve the required spray quality.
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 device achieves a remarkable spray quality with reduced actuation force, as low as 1.5 kg, by utilizing small stiffness for the pre-compression spring and multiple feed ducts, ensuring soft actuation without compromising spray quality.
Implementation Method 1
a pre-compression spring for increasing the pressure in a pump chamber
Implementation Method 2
a return spring for returning the actuator rod to its rest position
Implementation Method 3
a nozzle for forming a spray through a dispenser orifice
Data Source
AI summary
A fluid dispenser device comprising a pre-compression pump (6) and a dispenser head (T);the pump including an actuator rod (65) that is movable downwards and upwards, and a pre-compression spring (69) for increasing the pressure in a pump chamber (60);the head (T) including an inlet well (14) for connecting to the actuator rod (65), and a nozzle (4) for forming a spray through a dispenser orifice (43), the nozzle being mounted in an assembly housing (2);the dispenser device being characterized in that:the pre-compression spring (69) presents stiffness that is less than about 3 N/mm, e.g. of about 1 N/mm to 3 N/mm; andat least two feed ducts (15), each connecting the inlet well (14) to the assembly housing (2).