Divided Stator Casing Radial Force Absorption
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Solution Overview
Problem
Eccentric screw pumps with elastomer bodies face high wear and require frequent maintenance due to radial and axial forces during operation, necessitating improved fixation methods to prevent movement and enhance sealing.
Innovation Solution
The stator casing incorporates open cavities and recesses on its end face to create a friction-locked and form-fit connection with the elastomer body's collar, allowing for effective radial force absorption and secure fixation, with a detachable design for easy assembly and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastomer body is fixed solely by clamping between the stator casing and connection body, then assembly is simple, but radial forces are not adequately absorbed and the elastomer body may move or rotate
Solution Approach 1:
The stator casing is provided with localized structural features (protrusions or recesses) at specific positions to engage with corresponding features on the elastomer body collar. This creates localized form-fit connections that provide directional constraint without requiring complete structural redesign of the entire clamping assembly.
Solution Approach 2:
The collar of the elastomer body is inserted into the stator casing, and the collar itself is provided with protrusions or recesses that engage with complementary features in the stator casing. This nested arrangement allows the collar to serve both as a sealing element and as a mechanical constraint against radial forces and rotation.
2Reliability
If the collar is made thicker to improve radial force absorption, then fixation improves, but assembly space requirements increase and sealing effectiveness may be compromised
Solution Approach 1:
Instead of uniformly increasing collar thickness, the solution introduces localized protrusions or recesses on the collar surface that engage with corresponding features in the stator casing. This provides enhanced radial force resistance at specific engagement points without requiring overall collar thickening, thereby maintaining compact dimensions and effective sealing clearance.
3Ease of manufacture
If the stator casing is made as a single piece for structural integrity, then manufacturing is simpler, but maintenance and elastomer body replacement become more difficult
Solution Approach 1:
The stator casing is divided into multiple separable parts (such as upper and lower halves or segments) that can be detached from one another. This segmentation allows the elastomer body to be accessed and replaced by separating the casing components, while the individual casing parts can still be manufactured using standard processes. The segmented design maintains structural integrity during operation but facilitates maintenance when needed.
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 solution securely fixes the elastomer body, counteracting rotational motion and enhancing sealing, while allowing for straightforward assembly and maintenance by creating a stable, friction-locked connection that absorbs radial forces, thus extending the lifespan of the stator casing.
Implementation Method 1
the collar is squashed and a sealed connection thus arises between the stator and the connection body. Although the elastomer body is also fixed axially in this way, the radially acting forces in the region of the collar are however taken up solely by the constituted friction-locked connection.
Implementation Method 2
the distance arising between the stator casing and the connection body being smaller than the thickness of the collar, as a result of which the collar is squashed
Implementation Method 3
The elastomer body is often provided in practice with a casing, the stator being vulcanised for example into the casing.
Data Source
AI summary
A stator for eccentric screw pumps with a stator casing for an elastomer body for accommodating a rotor, the elastomer body being provided with at least one collar, wherein the collar is disposed in a recess between the stator casing and a connection body, wherein the fixing of the elastomer body in the stator casing is to be improved. The stator casing includes for this purpose open cavities, recesses and/or elevations at least at one side on the end face.