Impeller Hub Adhesive Bonding for Torsion-Proof Motor Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for connecting an impeller to an external rotor motor require additional parts, such as sheet metal circular blanks, which increase costs and complexity, and often necessitate minimal play for a secure press-fit connection, limiting design flexibility and stability.
Innovation Solution
A secure torsion-proof connection is achieved through physical and chemical interactions between an adhesive medium and the contact surfaces of the impeller hub and motor, eliminating the need for additional parts by allowing a defined intermediate space to be filled with adhesive, which provides mechanical stability and strength without the need for metal rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a press-fit connection with sheet metal circular blank is used to connect impeller to motor, then mechanical stability and strength are improved, but device complexity and manufacturing cost increase due to additional parts and special production procedures
Solution Approach 1:
The invention removes the sheet metal circular blank from the assembly, eliminating the additional part and its associated production complexity while maintaining connection strength through adhesive bonding alone
Solution Approach 2:
The mechanical press-fit connection using sheet metal blank is replaced with a chemical adhesive bonding system, substituting mechanical fastening with chemical bonding to achieve the same connection function with fewer parts
2Reliability
If minimal play is used between motor and impeller for press-fit connection, then connection security is improved, but design flexibility is reduced
Solution Approach 1:
The adhesive medium acts as an intermediary substance between the motor and impeller, filling the intermediate space and enabling secure connection even with larger play, thus decoupling connection security from minimal play requirements
Solution Approach 2:
The invention changes the connection mechanism from mechanical interference fit (requiring minimal play) to chemical adhesive bonding (tolerating larger play), fundamentally altering the connection parameters to enable design flexibility
3Strength
If sheet metal circular blank is used for torsion-proof connection, then connection strength is improved, but material cost and production cost increase
Solution Approach 1:
The sheet metal circular blank is completely removed from the assembly, eliminating material costs associated with this additional component while maintaining connection strength through adhesive bonding
Solution Approach 2:
The invention uses composite bonding approach combining adhesive medium with the interface between motor and impeller, creating a unified connection structure that eliminates the need for separate metal reinforcement parts
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 enables a cost-effective, simple production process that maintains mechanical stability and strength, allowing for a nearly tension-free connection and reduced material costs, while accommodating some play between the impeller and motor for improved design flexibility.
Implementation Method 1
the connection of the impeller to the motor results from physical and/or chemical interactions between an adhesive medium and the contact surfaces of the impeller hub and of the motor
Data Source
AI summary
An arrangement of an impeller (1) on an electrical motor, in particular on an external rotor motor (8), whereby the torque of the motor is transferred to the impeller (1) by means of a torsion-proof connection between the rotor (8) of the motor and the impeller (1) and/or its impeller hub (3), is characterised in that the connection of the impeller (1) to the motor (8) results from physical and/or chemical interactions between an adhesive medium (10) and the contact surfaces (5) of the impeller hub (3) and of the motor (8), which face each other, whereby the adhesive medium (10) fills, at least partially, an intermediate space (9) that is formed between the impeller (1) and the motor (8) by the given play.