Screw Pump Mixing Device for Viscous Liquids
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Solution Overview
Problem
Existing mixing devices using scoop piston pumps deliver pulsating and volumetrically limited flows, leading to incomplete emptying of containers and inaccurate mixing ratios due to viscosity differences and uneven fill levels, requiring additional volumetric measuring devices that increase energy consumption and complexity.
Innovation Solution
A mixing device utilizing screw pumps connected to an adjustable follower plate that forms a seal with the container, allowing for pulsation-free, volumetric delivery with adjustable mixing ratios and eliminating the need for external pressure reduction, enabling precise mixing across a wide viscosity range without residual material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scoop piston pumps are used for liquid delivery, then the system can handle various viscosities, but the delivery flow becomes pulsating and volumetric precision is limited
Solution Approach 1:
The patent replaces the reciprocating mechanical motion of scoop piston pumps with a rotary screw mechanism. The screw pump converts rotational motion into continuous linear displacement of liquid, eliminating pulsations while maintaining volumetric precision through the geometric relationship between screw pitch and barrel volume.
Solution Approach 2:
The screw pump utilizes continuous rotary periodic motion to achieve steady liquid displacement. Each rotation of the screw delivers a precise volumetric portion, creating a continuous non-pulsating flow pattern that maintains both adaptability to viscosity and precision in delivery.
2Productivity
If scoop piston pumps with check valves are used, then material can be delivered, but residual material remains in the barrel and inlet funnel
Solution Approach 1:
The screw pump's continuous rotary mechanism replaces the reciprocating scoop piston system, allowing complete evacuation of material from the barrel and inlet funnel. The screw threads progressively move all material forward without leaving residuals, eliminating waste while maintaining delivery productivity.
3Manufacturing precision
If volumetric measuring devices and pressure reducing valves are added to achieve precise mixing ratios, then mixing accuracy improves, but energy consumption and system complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for volumetric measuring devices and pressure reducing valves by incorporating precision directly into the pump mechanism itself. The screw pump's geometric design inherently provides precise volumetric delivery, removing auxiliary components and reducing system complexity while maintaining mixing ratio precision.
Solution Approach 2:
The screw pump performs multiple functions simultaneously: it delivers precise volumetric flow, maintains constant pressure, and ensures complete container emptying, all through a single integrated mechanism rather than requiring separate components for each function.
4Reliability
If pressure reducing valves are installed to maintain constant delivery pressure, then pressure fluctuations are compensated, but energy consumption increases
Solution Approach 1:
The screw pump replaces the pressure reducing valve system with its inherent pressure-stabilizing mechanical design. The continuous rotary motion and sealed chambers maintain constant delivery pressure without requiring active pressure regulation, reducing energy consumption while ensuring pressure reliability.
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
Ensures complete emptying of containers with precise mixing ratios, reduces energy consumption by eliminating the need for pressure reduction valves, and allows for efficient handling of both thin and highly viscous liquids, minimizing material waste and operational complexity.
Implementation Method 1
The removal devices (4) each have a screw pump (4)
Implementation Method 2
the follower plate (6) resting on the liquid surface and forming a seal with the container
Data Source
AI summary
The invention relates to a mixing device for mixing at least two liquids, said device comprising at least two containers, each of which holds a liquid, and at least two pumps for delivering the liquids, each of said pumps being situated on a respective container. The pumps (4) are screw-jack type pumps connected to a follower plate (6) and the height of said plate (6) is adjustable. The follower plate (6) lies on the surface of the liquid and seals the container.