Integrated Pump Rotor Chamber Design for Corrosion Prevention
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Solution Overview
Problem
Conventional pumps with integrated, electronically commutated motors are prone to damage from water contamination and corrosion, and the sliding bearing wears unevenly due to the rotor's weight, leading to reduced service life and potential mechanical issues.
Innovation Solution
The design integrates the pump chamber with a rotor and impeller, eliminating the need for a bearing plate, using a pot-like shield to minimize volume, and employing radial and axial bearings with O-rings for sealing and vibration damping, while encasing the rotor in plastic to prevent corrosion and facilitate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a bearing plate with sliding bearing is used to separate the rotor chamber and hydraulic chamber, then the motor can be integrated with the pump, but water contamination and corrosion occur when sealing fails
Solution Approach 1:
The rotor chamber and hydraulic chamber are merged into a single integrated pump chamber. The rotor is directly mounted in the pump chamber without a separate bearing plate, eliminating the sealing interface between chambers. Water flows through the rotor chamber during pumping, continuously cleaning and cooling the rotor while preventing contamination accumulation.
Solution Approach 2:
The pumping process itself serves to clean and cool the rotor. Water flowing through the integrated chamber during normal operation automatically removes contaminants and provides cooling, eliminating the need for separate sealing and protection systems.
2Ease of operation
If a sliding bearing is used to support the rotor shaft, then the rotor can be mounted, but the bearing becomes worn unevenly due to rotor weight
Solution Approach 1:
The sliding bearing is extracted from the rotor shaft and mounted instead on the stationary pump chamber wall. The rotor rotates freely on the shaft without a sliding bearing attached to it, eliminating the uneven wear caused by the bearing supporting the rotor's weight during rotation.
3Device complexity
If a bearing plate is used between rotor and impeller, then motor and pump can be integrated, but the pump dimensions increase
Solution Approach 1:
The bearing plate is eliminated by merging the rotor chamber and hydraulic chamber into a single integrated pump chamber. The rotor and impeller are positioned within the same chamber space, removing the intermediate bearing plate structure and reducing overall pump dimensions.
4Ease of manufacture
If the rotor interior is solid, then manufacturing is simpler, but water entering and freezing causes high tensile stresses
Solution Approach 1:
The rotor interior is segmented into two conically tapering subregions that meet at a weak point. This segmentation allows controlled fracture at the weak point when water freezes, preventing high tensile stresses from propagating through the entire rotor structure and causing catastrophic failure.
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 design enhances the pump's durability by continuous cleaning and cooling with water flow, reduces wear on bearings, and minimizes corrosion risks, leading to increased service life and efficient operation.
Implementation Method 1
the pump chamber to be continuously cleaned during the pumping process by water flowing through, so that the water is not severely contaminated. A further advantage is that, with this design, the rotor can be cooled by water flowing through.
Implementation Method 2
The shaft is advantageously mounted in the shield, in particular for damping vibration in at least one O-ring which is preferably made from rubber.
Implementation Method 3
The shaft is advantageously mounted in the shield, in particular for damping vibration in at least one O-ring which is preferably made from rubber.
Implementation Method 4
The sliding bearing and/or the axial bearing preferably have/has a liquid seal, in particular with a sealing rubber and/or an O-ring. In this way, the sliding bearing and/or the axial bearing are/is sealed during the pumping process, so that water is prevented from flowing through the sliding bearing and/or through the axial bearing, and therefore no corrosion can occur in the bearings.
Data Source
AI summary
A pump is provided with an integrated, electronically commutated wet running engine. The pump contains a single-component pump chamber containing a rotor of the wet running engine. The pump allows the pump chamber to be continuously cleaned during the pumping process by water flowing through so that the water is not severely contaminated.