Eccentric Screw Pump Outlet Flange for Faster Stator Maintenance
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Solution Overview
Problem
Eccentric screw pumps face challenges in maintenance due to the difficulty in disassembling the stator and rotor without causing leakage and the risk of blockages, which leads to increased downtime and costs, especially when dealing with viscous or solid-containing media.
Innovation Solution
The design includes a stator outlet flange oriented at an angle to the longitudinal axis, allowing the stator housing to be swiveled without disconnecting inlet or outlet pipes, and a cavity in the rotor for simplified separation from the drive shaft, using a tensioning element to facilitate disconnection without direct screw unscrewing, and a frusto-conical connection for easy separation of the shaft-hub connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the stator housing is disassembled by separating flange connections vertically to the longitudinal axis, then the stator and rotor can be removed for maintenance, but the disassembly process is time-consuming and requires specific lifting tools due to the considerable weight of the stator-rotor unit
Solution Approach 1:
The flange connection plane is oriented at an angle between 0° and 90° to the longitudinal axis instead of being vertical (90°), creating a tilted configuration that enables swiveling movement. This angular reorientation allows the stator housing to be swung out in a controlled manner, reducing the need for heavy lifting equipment and decreasing maintenance time while maintaining secure connections during operation.
2Ease of repair
If a spacer ring is arranged between the stator and outlet pipe connection piece to facilitate disassembly, then the stator becomes easier to disassemble, but additional sealing surfaces are created on the pressure side which causes leakage risk
Solution Approach 1:
The flange connection is designed with an asymmetric angular orientation relative to the longitudinal axis, creating a tilted flange connection plane. This asymmetric configuration enables the stator housing to be swiveled out for maintenance without requiring additional spacer rings or creating extra sealing surfaces, thereby maintaining sealing reliability while improving ease of disassembly.
3Device complexity
If the flange connection plane is oriented vertically to the longitudinal axis, then the connection is structurally simple, but the stator housing cannot be swiveled for maintenance without disconnecting inlet and outlet pipes
Solution Approach 1:
The flange connection plane is reoriented at an angle between 0° and 90° to the longitudinal axis, transitioning from a vertical orientation to a tilted configuration. This angular change in the connection geometry enables the stator housing to be swiveled for maintenance while keeping the inlet and outlet pipes connected, balancing structural simplicity with ease of repair.
Data Source
AI summary
An eccentric screw pump, comprising a rotor that extends along a longitudinal axis of the rotor from a drive end to a free end, a stator housing with an internal cavity that extends along the longitudinal axis from a stator inlet opening to a stator outlet opening and that is designed to accommodate the rotor, a drive motor with a drive shaft that is coupled with the rotor to transmit a torque, a first cardan joint which is placed within the transmission of the torque between the drive shaft and the rotor, and a stator outlet flange that is arranged in flow direction behind the rotor. The stator outlet flange comprises a flange connection plane that is oriented non-vertically to the longitudinal axis.