Screw Pump Coupling with Torsional Vibration Damping
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Solution Overview
Problem
Existing multi-screw pump designs face issues with vibrations and unsteady operation due to alignment errors and manufacturing tolerances, leading to reduced longevity, despite the use of elastic couplings which can be bulky and require separate coupling areas.
Innovation Solution
A coupling piece on the output shaft with a torsional vibration-damping mechanism, allowing for both rigid and flexible coupling configurations, where the coupling piece is designed to accommodate a spring or screw engagement, and features elastic couplings to dampen torsional vibrations, functioning as both a rigid and elastic coupling component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic couplings are used to compensate for alignment errors and manufacturing tolerances, then the pump's operational stability is improved, but the coupling area becomes bulky and requires separate coupling space
Solution Approach 1:
The patent merges the rigid coupling function and elastic coupling function into a single integrated coupling piece. The coupling piece includes a rigid coupling area for motor coupling and an elastic coupling area with vibration-damping means, eliminating the need for separate coupling components and reducing overall volume while maintaining operational stability.
Solution Approach 2:
The coupling piece serves multiple functions simultaneously: it provides rigid coupling for precise power transmission, elastic coupling for compensating alignment errors, and vibration damping for reducing torsional oscillations. This multi-functionality reduces the number of separate components needed.
2Manufacturing precision
If a rigid coupling is used for precise alignment between motor and pump, then coupling precision is improved, but vibrations and unsteady running increase due to alignment errors and manufacturing tolerances
Solution Approach 1:
The coupling piece has different local properties: the coupling area for motor coupling is designed for rigid connection to ensure precise alignment, while the delivery side features elastic coupling means with vibration dampers to compensate for tolerances and reduce vibrations. Each area has optimized properties for its specific function.
3Reliability
If elastic coupling components are added to dampen torsional vibrations, then operational stability is improved, but device complexity increases
Solution Approach 1:
The vibration-damping means are integrated directly into the coupling piece structure rather than being separate components. The elastic coupling area is formed as part of the coupling piece itself, reducing the number of discrete parts and simplifying assembly while maintaining vibration-damping functionality.
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 effectively reduces vibrations and shock transmission, enhancing the pump's operational stability and longevity by integrating vibration-damping means within the coupling piece, which can be accessed and configured without dismantling the clutch or output shaft, ensuring precise alignment and reduced bulkiness.
Implementation Method 1
torsional vibration-damping means are now arranged on the delivery side of this coupling piece between the output shaft and the coupling piece. These torsional vibration-damping means ensure that the power transmission from the drive shaft to the output shaft is dampened against shocks and rough running. Advantageously, however, the means for damping torsional vibrations are elastic couplings
Data Source
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AI summary
The invention relates to a screw pump (1) with a pump housing (2, 3, 7) and with several conveying screws arranged within the pump housing (2) in its conveying area, wherein the conveying screws have shafts (5, 6) extending axially to the drive-side end of the pump (1) into a gear section (7) in which the shafts (5, 6) have gears (8, 9) by means of which the shafts (5, 6) are rotaryally coupled, wherein one of the shafts (5) has a coupling piece (22) on the drive side for coupling to an external drive motor, wherein the pump housing (2, 3, 7) is further configured on the drive side with a flange (20) for connection to the drive motor.and the coupling piece (22) of the output shaft (5) of the pump (1) extends axially into the area of this flange (20) and is designed and arranged to be suitable for the rigid coupling of the drive shaft of the motor to the output shaft (5) of the pump (1), and is characterized in that torsional vibration damping means (26, 40, 41) are arranged on the delivery side of this coupling piece (22) between the shaft (5) and the coupling piece (22).