Pump Unit Pre-Assembly Testing and Bearing Sleeve Design
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Solution Overview
Problem
Existing pump components, such as the drive shaft, rotor, and pump stator, can only be tested for properties like flow rate, efficiency, and pressure build-up after the entire delivery unit is assembled, making it difficult to ensure they meet specific tolerances and requiring costly rework if they do not meet requirements.
Innovation Solution
The drive shaft, rotor, and pump stator are configured to form a pump unit that can be tested independently using a test bench drive, with a bearing sleeve and holding means to secure the pump stator, allowing for immediate improvement if necessary, reducing manufacturing costs and optimizing alignment and sealing to minimize wear and internal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump components (drive shaft, rotor, pump stator) are tested only after complete assembly of the delivery unit, then the testing can be performed on the finished product, but the manufacturing costs increase due to costly rework when components do not meet required properties
Solution Approach 1:
The pump components (drive shaft, rotor, pump stator) are separated from the complete delivery unit assembly and grouped as a distinct pump unit. This segmentation allows the pump unit to be tested independently on a test bench before final assembly, enabling early detection of performance issues and avoiding costly rework of the complete assembly.
Solution Approach 2:
The pump unit is tested on a test bench drive before being integrated into the complete delivery unit. This preliminary testing action allows performance verification and necessary adjustments to be made in advance, preventing the need for expensive rework after complete assembly and reducing manufacturing costs.
2Reliability
If the pump components are tested after complete assembly, then all components are present for testing, but the time required for manufacturing increases due to delayed identification of component issues
Solution Approach 1:
The pump unit is tested on a test bench drive before being integrated into the complete delivery unit. This preliminary testing action allows performance verification and necessary adjustments to be made in advance, preventing the need for expensive rework after complete assembly and reducing manufacturing costs.
3Measurement precision
If the pump stator is securely held relative to the drive shaft and rotor during testing, then accurate performance measurement is possible, but the alignment precision requirements increase
Solution Approach 1:
The bearing sleeve serves as an intermediary component that holds the drive shaft and provides a mounting surface for the pump stator. This intermediate structure facilitates precise alignment and secure positioning of the pump stator relative to the rotating components, enabling accurate performance measurements without requiring extremely tight manufacturing tolerances.
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 enables early identification and improvement of pump unit performance, reducing manufacturing costs and enhancing efficiency by allowing for pre-assembly testing and optimization, thus ensuring the pump unit meets required properties before full assembly.
Implementation Method 1
the bearing sleeve has three step sections with different diameters, with a plain bearing being provided on each of the two outer step sections
Implementation Method 2
at least one sealing means is provided which seals a gap between the bearing sleeve and the drive shaft
Implementation Method 3
a hydrodynamic lubricating film is generated
Data Source
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AI summary
Pumping assemblies are already known, comprising a drive shaft and a rotor rotatably arranged in a pump stator and driven by the drive shaft. The drive shaft has an oblique sliding plane which cooperates with the rotor and which permits the rotor to wobble about a drive axis of the drive shaft by the rotor axis thereof. The rotor has a toothing on the end side thereof facing away from the drive shaft, which engages with a toothing formed on the pump stator. Work spaces are formed between the toothing of the rotor and the toothing of the pump stator in order to pump pumping media. The drive shaft, the rotor and the pump stator are individual pump components which, in cooperation, have determined properties to fulfill, such as flow rate, effectiveness and pressure build-up, within determined tolerances. Whether the pump components together can fulfill these required properties can only be tested in a function test on the finished product, i.e. after the complete construction of the pump assembly. For the pump assembly according to the invention, the production costs are reduced. According to the invention, the drive shaft (2) is arranged in a bearing bushing (24) having a shoulder (31) protruding in a radial direction in relation to the drive axis (7), on which shoulder the pump stator (3) is retained by means of at least one retaining means (27).