Triple Screw Pump Assembly Flow Rate Optimization
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Solution Overview
Problem
Existing triple screw pumps have limited flow rate capacity due to the restrictive design condition of equal lateral screw external and internal diameters, which also leads to mechanical limitations and inefficiencies.
Innovation Solution
Relaxing the condition of equal diameters between the lateral screw external and internal diameters, allowing for a greater central screw external diameter and smaller internal diameter, while maintaining the same external diameter of the screws, to increase fluid trapping area and flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the lateral screw external diameter is made equal to the lateral screw internal diameter (prior art design), then the fluid trapping area is maximized, but the mechanical strength is reduced and wear increases
Solution Approach 1:
The patent applies parameter changes by modifying the diameter relationship between lateral screw external diameter and internal diameter. Specifically, it establishes that the lateral screw external diameter is greater than the lateral screw internal diameter by a specific amount (0.5-2mm), creating a measurable parameter difference that simultaneously provides mechanical strength while maintaining adequate fluid trapping area. This parameter modification resolves the contradiction by finding an optimal intermediate value.
2Productivity
If the central screw external diameter is increased to improve flow rate, then the flow rate capacity increases, but the radial dimensions of the pump increase
Solution Approach 1:
The patent applies parameter changes by establishing specific diameter relationships between central and lateral screws. The central screw external diameter is made greater than the lateral screw external diameter by 1-3mm, and the central screw internal diameter is made smaller than the lateral screw internal diameter by 1-3mm. These parameter modifications optimize the fluid trapping area and flow rate capacity while controlling the radial dimensions through defined dimensional relationships.
3Length of stationary object
If the lateral screw external diameter is reduced to decrease radial dimensions, then the pump becomes more compact, but the fluid trapping area decreases and flow rate is reduced
Solution Approach 1:
The patent applies parameter changes by establishing that the lateral screw external diameter is greater than the lateral screw internal diameter by a specific amount (0.5-2mm). This parameter difference creates an optimal balance where the radial dimensions are controlled while the fluid trapping area is maintained at adequate levels. The invention finds the optimal parameter range that prevents excessive radial size while ensuring sufficient fluid capacity.
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 modification increases the flow rate by about 17% while reducing the radial dimensions of the pump, improving mechanical strength, and reducing material usage and production costs.
Implementation Method 1
The screws, preferably with two helicoidal threads, are mounted in parallel within a casing and mesh with each other, thus generating closed volumes between their body and the casing. The closed chambers that are thus formed are in a number that is directly proportional to the length of the screws—also called rotors—and inversely proportional to the pitch of the helicoidal threads.
Implementation Method 2
The consideration behind this design choice is that two base cylinders of equal diameter, having equal tangential speed and rotating with opposite angular speeds, roll on each other without sliding, resulting in less heat or energy dispersion.
Implementation Method 3
The two driven screws are idle and guided by the pressurized fluid. The sole hindrances to their rotation are the viscous friction with the working fluid and the sliding friction with the central screw and with the casing within which they are contained.
Data Source
AI summary
Screw assembly (1) for a triple screw pump (10), comprising: a central screw (2) and at least one lateral screw (3) configured to mesh with said central screw (2) with a lateral screw axis (zl) parallel to the central screw axis (zc), wherein a central screw external diameter (Øce) is greater than a lateral screw external diameter (Øle) and a central screw internal diameter (0ci) is smaller than the lateral screw external diameter (Øle).