Stator Derricking Part for Eccentric Screw Pump Durability
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Solution Overview
Problem
Conventional uniaxial eccentric screw pumps face issues with stator damage due to repeated attachment and removal, particularly at the adhesion areas between the gasket parts and the outer cylinder, leading to potential leaks and reduced stator lifespan, especially in small-sized designs where adhesion areas are weakened.
Innovation Solution
The stator design incorporates derricking parts that protrude or are dented axially, allowing the gasket parts and outer cylinder to fit together, restricting radial elastic deformation and expanding the fixing area, thereby reducing stress and preventing damage during attachment and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stator is attached and removed repeatedly, then the ease of operation is improved, but the reliability deteriorates due to accumulated stress and damage at adhesion areas
Solution Approach 1:
The gasket part is divided into multiple functional zones: a sealing surface for fluid tightness, an adhesion area for bonding to the outer cylinder, and a derricking part for mechanical reinforcement. This segmentation allows each zone to perform its specific function optimally while distributing stress away from the adhesion areas during repeated attachment and removal cycles.
Solution Approach 2:
The derricking part is pre-formed as an integral feature of the gasket part, creating a reinforcement structure before the stator is assembled. This preliminary structural preparation prevents stress concentration at the adhesion areas during subsequent attachment and removal operations, extending the stator's service life.
2Strength
If the adhesion area is increased to improve reliability, then the strength is improved, but the device complexity increases due to additional structural requirements
Solution Approach 1:
The derricking part is merged with the gasket part as an integral feature rather than a separate component. This combining of the reinforcement structure with the existing gasket part increases the adhesion area and structural strength without adding additional parts or assembly steps, thereby avoiding increased device complexity.
Solution Approach 2:
The derricking part serves multiple functions simultaneously: it reinforces the gasket part structure, increases the adhesion area with the outer cylinder, and maintains the sealing capability. This multi-functionality achieves improved strength without requiring separate components for each function, thus avoiding complexity increases.
3Strength
If the gasket part is made larger to increase adhesion area, then the strength is improved, but the volume of the stator increases
Solution Approach 1:
Instead of increasing the gasket part's radial or axial dimensions to enlarge the adhesion area, the invention utilizes the dimensional space within the existing stator structure by forming the derricking part as a recessed or protruding feature. This approach increases the effective adhesion area without proportionally increasing the overall stator volume.
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 enhances the stator's durability and lifespan by minimizing deformation and stress at the adhesion areas, preventing leaks and extending the stator's operational period.
Implementation Method 1
the gasket parts 546 and 547 are elastically deformed so as to extend radially outwardly. Moreover, when the stator 520 is removed from the pump, the gasket parts 546 and 547 are released from the pinching force from both sides in the axial directions of the stator 520, and are elastically deformed so as to contract inwardly in the radial directions
Implementation Method 2
The outer cylinder and the stator main body are fixed to an inner circumferential surface of the outer cylinder by a method, such as adhesion with adhesives or pressure joining by heat
Implementation Method 3
The outer cylinder and the stator main body are fixed to an inner circumferential surface of the outer cylinder by a method, such as adhesion with adhesives or pressure joining by heat
Data Source
AI summary
The present invention aims to provide a long-life stator and a uniaxial eccentric screw pump provided with the stator, which enable a comparatively extended period of use by preventing damage of the stator due to repeating of attachment and removal to/from the uniaxial eccentric screw pump.A stator 20 includes an outer cylinder 30, and a stator main body 42 having flange-shaped gasket parts 46 and 47. The stator 20 includes fixing areas 24 and 25 to which the gasket parts 46 and 47 and the outer cylinder 30 are adhered. One or both of the outer cylinder 30 and the gasket parts 46 and 47 has a derricking part penetrating or being dented in axial directions X and made into such a shape where at least part of one of the outer cylinder and the gasket parts is fitted into the other.