Eccentric Screw Pump Stator and Rotor Replacement
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Solution Overview
Problem
Eccentric screw pumps require frequent maintenance, particularly the replacement of elastomeric stators and rotors, which is costly and time-consuming due to the need to dismantle multiple components, complicating the process and increasing operational expenses.
Innovation Solution
The design allows for the separate replacement of the elastomeric stator and the rotor within the eccentric screw pump without dismantling the suction housing or connecting piece, utilizing a longitudinally divided stator and a detachable coupling joint with form-fitting elements for non-rotatable connections, enabling axial separation and replacement without disassembling the coupling joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the stator and rotor are replaced by dismantling the suction housing and connecting piece, then the replacement can be done, but the process becomes expensive and time-consuming due to the need to dismantle multiple components
Solution Approach 1:
The stator is divided into two separate half-shells that can be removed independently from each other and from the rotor, allowing the stator to be replaced without dismantling the suction housing or connecting piece. The coupling joint is also segmented into a first joint part and a second joint part that can be separated from the rotor.
Solution Approach 2:
The stator half-shells are extracted from the pump assembly by removing them from the rotor in sequence, with the first half-shell being removed first and the second half-shell being removed second, allowing complete stator replacement without dismantling the suction housing or connecting piece.
2Ease of repair
If the stator is designed as a longitudinally divided stator with two half shells, then the stator can be replaced without dismantling the pump, but additional complex components are required
Solution Approach 1:
The stator is segmented into two half-shells that can be separately removed and replaced, simplifying maintenance while adding minimal structural complexity compared to a conventional integrated stator design.
3Ease of repair
If the rotor is detachably connected to the second joint part of the coupling joint, then the rotor can be replaced without dismantling the coupling joint, but the coupling joint structure becomes more complex
Solution Approach 1:
The coupling joint is segmented into a first joint part and a second joint part, with the rotor detachably connected to the second joint part. This allows the rotor to be replaced by separating it from the second joint part without dismantling the entire coupling joint or suction housing, adding minimal complexity to achieve significant maintenance simplification.
4Ease of operation
If additional form-fitting elements are provided for non-rotatable connections, then axial separation and replacement is enabled, but the number of components increases
Solution Approach 1:
Form-fitting elements are provided locally at specific locations on the rotor and second joint part to enable non-rotatable axial connections. These localized features enable easy axial separation and replacement without requiring complex fastening mechanisms throughout the entire assembly.
Data Source
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AI summary
Eccentric screw pump with at least one stator (1) and a rotor (2) rotatably mounted in the stator, wherein a suction housing (4) is arranged at one end of the stator and a connection nozzle (5) is arranged at the opposite end, wherein the rotor is connected within the suction housing to a coupling rod (6) or a drive shaft via a coupling joint (7), wherein the coupling joint consists of a drive-side, first joint part and a rotor-side second joint part (7b) pivotally connected to the first joint part (7a), wherein the rotor is detachably connected to the second joint part of the coupling joint. The second joint part has a rotor receptacle facing the rotor and open on the rotor side, into which the rotor end (15) can be inserted axially, forming a rotationally fixed connection.