Electric Pump Rotor Structure to Reduce Blade Warpage
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Solution Overview
Problem
Existing electric pumps with blades on both front and rear surfaces face issues of warpage due to unequal loads, leading to potential size increase and manufacturing complications, particularly when using resin, which can result in molding defects and higher costs.
Innovation Solution
The electric pump design includes a rotor with a first and second blade member separated by a relay portion having a smaller outer diameter, positioned between them, and a case structure that supports the rotor, reducing blade thickness and suppressing excessive axial loads, thereby minimizing the pump's size and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the thickness of the blade member is increased to suppress warpage, then the structural stability is improved, but the axial size of the electric pump increases
Solution Approach 1:
The blade member is divided into multiple blades arranged circumferentially, with each blade being thinner individually. The relay portion segments the blade member structure, allowing thin blades to be supported without requiring excessive thickness, thus preventing warpage while maintaining compact axial dimensions.
Solution Approach 2:
The relay portion acts as an intermediary structure between the front and rear blade members. It provides support and spacing that prevents warpage of the thin blades without requiring the blades themselves to be thick, thereby resolving the contradiction between blade stability and compact size.
2Force
If blades are provided on both front and rear surfaces of the blade member, then the load balance is improved, but molding defects may occur and manufacturing complexity increases
Solution Approach 1:
The blade member with blades on both surfaces is segmented into multiple independent blades rather than forming a solid thick structure. This segmentation allows resin molding to proceed without defects while maintaining load balance, as the segmented structure reduces molding complexity and improves manufacturability.
3Stability of the object's composition
If the blade member is formed thick to prevent warpage, then the structural stability is improved, but the manufacturing cost increases
Solution Approach 1:
Instead of manufacturing a single thick blade member, the structure is segmented into multiple thin blades with a relay portion. This segmentation enables more efficient resin molding processes, reducing manufacturing complexity and cost while achieving the required structural stability through the distributed blade configuration.
Solution Approach 2:
The design changes the thickness parameter of individual blades from thick to thin, compensated by the relay portion structure. This parameter change enables easier and cheaper manufacturing through resin molding while maintaining overall structural stability through the multi-blade configuration.
Data Source
AI summary
An electric pump includes a case, and a motor that includes a rotor and a stator and is surrounded by the case. The case includes an introduction pipe portion for introducing a fluid and a discharge pipe portion for discharging the fluid. The rotor is disposed in a space surrounded by the case and the stator and communicating with the introduction pipe portion and the discharge pipe portion. The rotor includes a first blade member, a second blade member, and a relay portion. An outer diameter of the relay portion is smaller than an outer diameter of at least one of the first and second blade members. The relay portion is positioned between the first blade member and the second blade member.