Eccentric Screw Pump Stator Thermal Expansion Management
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Solution Overview
Problem
Conventional uniaxial eccentric screw pumps face issues with abnormal wear and rotor damage due to excessive friction when cleaning and sterilizing with high-temperature fluids, requiring complex and cumbersome interference adjustments to prevent deformation and maintain proper operation.
Innovation Solution
A uniaxial eccentric screw pump design featuring a stator that is expandable and shrinkable radially, with a female threaded inner surface and a male threaded rotor, along with a closure structure to prevent foreign substance intrusion and maintain air-tightness, allowing for high-temperature cleaning and sterilization without disassembly and minimizing interference adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the stator is cleaned and sterilized with high-temperature fluid, then the stator expands, but the deformation toward outer diameter is prevented by the outer sleeve causing increased interference and excessive friction
Solution Approach 1:
The stator is divided into two functional layers: an inner stator body made of elastic material that can expand and contract radially, and an outer sleeve made of rigid material that maintains structural integrity. This segmentation allows the inner stator body to expand during high-temperature cleaning without being constrained by the outer sleeve, thereby preventing excessive friction while maintaining structural stability.
Solution Approach 2:
The stator body is made of elastic material whose radial dimensions can change in response to temperature variations. During high-temperature cleaning, the stator body expands radially outward, and during normal operation, it returns to its original dimensions. This parameter change allows the stator to accommodate thermal expansion without creating excessive interference with the rotor.
2Stability of the object's composition
If the outer sleeve prevents stator expansion, then structural stability is maintained, but interference with the rotor increases causing abnormal wear
Solution Approach 1:
The stator structure is segmented into an inner elastic stator body and an outer rigid sleeve. The inner stator body is responsible for radial expansion and contraction, while the outer sleeve provides structural stability and maintains the overall shape. This segmentation allows each component to perform its specific function without interfering with the other.
Solution Approach 2:
The stator is constructed as a composite structure combining elastic material (for the stator body) and rigid material (for the outer sleeve). This composite construction allows the stator to simultaneously exhibit both flexibility (for thermal expansion) and structural stability (for maintaining shape and preventing deformation).
3Manufacturing precision
If manual interference adjustment is performed, then proper rotor-stator contact is achieved, but the operation becomes complicated and time-consuming
Solution Approach 1:
The stator body automatically adjusts its radial dimensions in response to temperature changes during cleaning operations. During high-temperature cleaning, the stator body expands radially outward on its own, maintaining proper clearance with the rotor without requiring manual adjustment. This self-service mechanism eliminates the need for complicated manual interference adjustment operations.
Solution Approach 2:
The interference between the rotor and stator is automatically controlled through temperature-dependent parameter changes of the stator body. During high-temperature cleaning, the stator body expands radially, increasing the clearance with the rotor. During normal operation at lower temperatures, the stator body contracts to its original dimensions, maintaining the designed interference. This automatic parameter change eliminates the need for manual adjustment.
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
Prevents abnormal wear by allowing the stator to expand without increasing pressure contact with the rotor, enabling efficient fluid conveyance and sterilization while maintaining asepsis and operational efficiency without manual interference adjustments.
Implementation Method 1
the stator is configured to be expandable and shrinkable in a radial direction... even when a fluid of a high temperature is made to flow through the uniaxial eccentric screw pump, the stator is expandable in the outer diameter direction
Data Source
AI summary
A uniaxial eccentric screw pump includes: a casing; a stator having one end portion thereof connected to the casing and having an inner peripheral surface which is formed into a female threaded shaped; a rotor configured to be insertable into the stator and formed of a shaft body having a male threaded shape; and an end stud connected to the other end portion of the stator. The stator is configured to be expandable and shrinkable in a radial direction.