Pump Permanent Magnet Ring Anti-Twist Holder
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Solution Overview
Problem
Existing pumps, particularly in household appliances like dishwashers and washing machines, face challenges in achieving cost-effectiveness and extended service life due to issues with the securement of permanent magnet rings and inefficient liquid circulation, leading to potential detachment and reduced efficiency.
Innovation Solution
A DC pump drive motor with an electrically controllable stator winding and a rotor featuring a holder with a circular ring-cylindrical sleeve section to securely attach a permanent magnet ring, incorporating anti-twist devices and flow channels to prevent twisting and ensure efficient liquid circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the permanent magnet ring is simply placed on the holder without anti-twist devices, then the manufacturing cost is reduced and the structure is simplified, but the permanent magnet ring may detach or twist during operation, reducing reliability and service life
Solution Approach 1:
The holder is segmented into functional zones: a drum-shaped receptacle for mounting the permanent magnet ring, axial bearing surfaces at the ends, and anti-twist devices in the form of securing projections extending into the receptacle. This segmentation allows each zone to perform its specific function while maintaining overall structural integrity.
Solution Approach 2:
The anti-twist devices are pre-formed as integral parts of the holder structure during manufacturing. The securing projections are molded into the drum-shaped receptacle before the permanent magnet ring is installed, ensuring immediate protection against twisting and detachment upon assembly.
2Duration of action of stationary object
If the holder structure is simplified without flow channels, then manufacturing becomes easier and costs decrease, but liquid circulation becomes inefficient, causing overheating and reduced service life
Solution Approach 1:
The holder incorporates flow channels that create a porous-like fluid passage network through its solid structure. These channels allow liquid to circulate efficiently through the holder, providing cooling and lubrication functions while maintaining the holder's structural integrity.
Solution Approach 2:
The holder utilizes hydraulic principles by incorporating flow channels that guide liquid flow through the motor assembly. The channels are designed to optimize fluid dynamics, ensuring efficient cooling of the permanent magnet ring and lubrication of moving parts during pump operation.
3Reliability
If anti-twist devices are added to the holder, then the permanent magnet ring is securely fixed against twisting, but the manufacturing complexity and production costs increase
Solution Approach 1:
The anti-twist devices are merged with the holder structure as integral components rather than separate parts. The securing projections are formed directly in the holder material, eliminating the need for separate anti-twist components and reducing assembly steps while maintaining reliable fixation.
Solution Approach 2:
The holder is manufactured as a composite structure combining the drum-shaped receptacle, securing projections, and axial bearing surfaces in a single integrated component. This composite approach allows complex geometries to be achieved through modern manufacturing techniques like injection molding, balancing complexity with ease of production.
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
The solution enhances the securement of permanent magnet rings, preventing detachment and improving electromagnetic efficiency by ensuring reliable fixation and effective liquid circulation, thus extending the service life and efficiency of the pump.
Implementation Method 1
a direct-current pump drive motor (8) with an electrically controllable stator winding (10) and a rotor (13) which is mounted in the field of the stator winding (10) so that it can be driven in rotation
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
The invention relates to a pump (1), having a DC pump drive motor (8) comprising a stator winding (10) which can be electrically driven, and comprising a rotor (13) which is mounted such that it can be driven in rotation in the field of the stator winding (10) and which has a motor shaft (7), a permanent-magnet ring (15) and a holder (14) which is mounted on the motor shaft (7) and on which the permanent-magnet ring (15) is held, wherein the pump (1) has a rotation-prevention means (19) which is designed to secure the permanent-magnet ring (15) against rotation about the axis of the rotor (13) on the holder (14). The invention also relates to a domestic appliance, in particular a dishwasher or a washing machine, having a pump (1) of this kind.