Foam Pump Mixing Chamber Layout for Leak-Free Wall Dispensers
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Solution Overview
Problem
Existing foam pumps designed for wall-mounted dispensers face issues with vertical alignment, leading to leakage and inefficiencies in mixing liquid and air, resulting in poor foam quality and residual fluid leakage due to suboptimal mixing chamber designs and axis alignments.
Innovation Solution
A foam pump with a mixing chamber where the fluid and air cylinders operate on an axis normal to the fluid throughflow axis, with the fluid inlet facing the flow direction and the air inlet positioned downstream, creating efficient turbulence and ensuring thorough mixing, preventing unmixed fluid residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fluid and air cylinders are arranged vertically on the fluid throughflow axis to match downward plunger operation, then the pump works effectively for top-mounted operation, but it is not suitable for wall-mounted dispensers that require lateral trigger operation
Solution Approach 1:
The patent reorients the fluid and air cylinders from a vertical arrangement (aligned with the fluid throughflow axis) to a horizontal arrangement (perpendicular to the fluid throughflow axis). This dimensional change allows the pump to be operated laterally via trigger while maintaining vertical fluid flow through the mixing chamber, thus adapting to wall-mounted dispenser configurations without sacrificing operational effectiveness.
2Adaptability or versatility
If a springloaded trigger is used to convert lateral trigger movement into vertical plunger movement, then wall-mounted operation becomes possible, but the transmission is not well controlled causing pump twisting and leakages
Solution Approach 1:
Instead of using a springloaded trigger to convert lateral motion to vertical motion, the patent directly aligns the fluid and air cylinders horizontally with the lateral trigger operation direction. This eliminates the motion conversion mechanism entirely, preventing pump twisting and sealing failures while maintaining wall-mounted operation capability.
3Volume of moving object
If the mixing chamber is arranged horizontally below the cylinders to save space, then device height is reduced, but the fluid throughflow axis becomes non-linear reducing operational effectiveness
Solution Approach 1:
The patent positions the mixing chamber vertically above the horizontal fluid and air cylinders, creating a linear vertical fluid throughflow axis that extends from the horizontal cylinders upward through the mixing chamber to the nozzle. This arrangement maintains both compact horizontal footprint and efficient linear fluid flow path.
4Ease of operation
If the mixing chamber is arranged vertically to maintain linear fluid flow, then operational effectiveness is maintained, but the device height increases significantly
Solution Approach 1:
The patent nests the vertical mixing chamber within or adjacent to the horizontal cylinder assembly, allowing the vertical fluid flow path to be integrated within the horizontal footprint of the cylinders. This nesting arrangement maintains linear vertical fluid flow for operational effectiveness while minimizing overall device height by utilizing the horizontal space already occupied by the cylinders.
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 configuration enhances foam quality by ensuring thorough mixing and prevents leakage by ensuring all fluid is dispensed, suitable for wall-mounted dispensers operated by lateral motion, with optional conical mixing chamber designs for increased turbulence and efficient fluid-air interaction.
Implementation Method 1
creating efficient turbulence and ensuring thorough mixing
Implementation Method 2
with optional conical mixing chamber designs for increased turbulence
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A foam pump (1) comprising a fluid cylinder (2), an air cylinder (3) and a mixing chamber (4), in which the mixing chamber (4) comprises a fluid throughflow axis (A-A), a fluid inlet (18) and an air inlet (44), in which the fluid cylinder (2) and the air cylinder (3) both comprise a stroke axis (B-B) which is substantially normal to said fluid throughflow axis (A-A), in which the fluid cylinder (2) is adapted to draw a fluid therein in a priming stroke and to pump said fluid into said mixing chamber (4) through said fluid inlet (18) in a dispensing stroke, in which the air cylinder (3) is adapted to draw air therein in a priming stroke and to pump said air into said mixing chamber (4) through said air inlet (44) in a dispensing stroke, and in which said fluid inlet (18) and said air inlet (44) face in substantially opposite directions.