Eccentric Screw Pump Axial Clamping Wedge Mechanism
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Solution Overview
Problem
Eccentric screw pumps face challenges in reliably reclamping the stator under higher loads, as existing methods require laborious adjustments and can be inefficient in distributing clamping forces.
Innovation Solution
The use of clamping elements with wedge-shaped surfaces and actuating elements that displace axially to generate radial clamping forces, allowing for indirect clamping and reducing the load on actuating elements during operation, enabling reclamping under higher loads and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radial clamping screws are used to clamp the stator, then the stator can be secured in position, but the actuating elements are overloaded under higher loads and pressures
Solution Approach 1:
A clamping ring is introduced as an intermediary component between the actuating elements and the stator. The clamping ring receives axial forces from the actuating elements and converts them into radial clamping forces through its geometry, thereby protecting the actuating elements from direct exposure to high radial loads while maintaining reliable stator clamping
2Strength
If axial displacement of clamping elements is used to generate radial clamping forces, then the load on actuating elements is reduced, but the device complexity increases
Solution Approach 1:
The clamping mechanism transforms the direction of force application from radial to axial. By displacing the clamping ring axially, radial clamping forces are generated through the geometric configuration of the clamping surfaces, effectively using another dimension (axial direction) to solve the radial clamping problem while reducing actuating element load
3Adaptability or versatility
If the stator clamping pressure is adjusted after wear, then operational optimization is enabled, but the reclamping process becomes laborious
Solution Approach 1:
The manual adjustment process is supplemented or replaced by an automated actuating mechanism that can adjust the clamping ring position axially. This mechanical substitution enables precise control of stator clamping pressure while simplifying the adjustment process, making it less laborious while maintaining adaptability for operational optimization
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 allows for reliable reclamping of the stator even under higher loads and pressures, reducing the burden on actuating elements and improving the pump's operational efficiency by decoupling clamping and holding forces during operation.
Implementation Method 1
The first clamping surfaces and/or the second clamping surfaces are formed as wedges. The clamping elements are then frustoconical, for example with inner frustoconical surfaces.
Data Source
AI summary
The invention relates to an eccentric screw pump, comprising at least one stator (1) composed of an elastic material and a rotor (2) that can be rotated in the stator (1), the stator (1) being surrounded by a stator casing (3) at least in some regions. The stator casing (3) consists of at least two casing segments (19) as a longitudinally divided casing and forms a stator clamping device, by means of which the stator (2) can be clamped against the rotor (1) in the radial direction. The pump is characterized in that the casing segments (19) have at least one clamping flange (20) having first clamping surfaces (21) at each end of the casing segments and that one or more clamping elements (22, 23), which can be displaced in the axial direction and have second clamping surfaces (24), are placed onto the clamping flange (20), the first clamping surfaces (21) and the second clamping surfaces (24) being designed in such a way and interacting in such a way that the stator casing (3) can be clamped against the stator in the radial direction in the course of an axial displacement of the clamping elements (22, 23).