Screw Pump Rotor Cooling via Segmented Flow Guide
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Solution Overview
Problem
Screw pump rotors experience rapid temperature rise due to compression, leading to a disparity in temperature with the stator, which can result in seizing if not adequately cooled, as existing cooling systems have limited heat transfer surfaces.
Innovation Solution
The design introduces a flow guide with a bore and radially spaced slots adjacent to the rotor body, made from materials with higher thermal conductivity than the rotor, to increase the heat transfer surface area and enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a central cavity with a single bore is used for coolant flow, then the structure is simple, but the heat transfer surface area is limited
Solution Approach 1:
The single central bore is segmented into multiple radial bores that extend from the central cavity to the outer surface of the rotor. This segmentation divides the coolant flow path into multiple channels, significantly increasing the heat transfer surface area between the coolant and the rotor body while maintaining a relatively simple overall structure.
Solution Approach 2:
The cooling system transitions from a one-dimensional central bore to a three-dimensional network of radial bores extending in multiple directions from the center. This dimensional expansion allows the coolant to access heat transfer surfaces throughout the rotor volume, dramatically increasing the effective heat transfer area without proportionally increasing structural complexity.
2Temperature
If the rotor cooling surface area is increased to prevent seizing, then the temperature disparity is reduced, but the device complexity increases
Solution Approach 1:
The radial bores are pre-formed within the rotor structure, creating internal coolant channels that are integrated into the rotor manufacturing process. This preliminary incorporation of cooling pathways allows heat transfer surface area to be increased without adding separate external cooling components, thereby reducing the overall device complexity while effectively managing temperature disparity.
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 significantly increases the surface area for cooling, effectively reducing the temperature disparity between the rotor and stator, thereby preventing seizing and improving pumping efficiency.
Implementation Method 1
an outer surface located adjacent the body to enable heat to be transferred thereto from the body
Data Source
AI summary
A rotor for a screw vacuum pump has a threaded body in which a central cavity is formed. A coolant is supplied to the cavity from a supply line provided in a shaft attached to the body. A coolant flow guide, which may be either separate from or at least partially integral with the shaft, is located within the cavity. The flow guide has an outer surface adjacent, preferably in contact with, the body to enable heat to the transferred from the rotor to the guide. The guide also has an inner surface defining a bore, and defines at least in part a plurality of axially extending slots radially spaced from and in fluid communication with the bore. In use, coolant flows into the cavity through the bore of the guide, and out from the cavity through the axially extending slots, extracting heat from the guide as it flows both into and out form the cavity. The discharged coolant is conveyed form the slots into a discharge line located within the shaft.