Impeller Hub Adhesive Assembly for Low-Imbalance Motor Mounting
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Solution Overview
Problem
Existing methods for connecting an impeller to an external rotor motor require additional parts like sheet metal blanks, increasing material and tool costs, and often result in imbalances due to the need for precise centering, which can be costly and complex to achieve.
Innovation Solution
A secure rotary connection is achieved through physical and/or chemical interactions between an adhesive medium and the contact surfaces of the impeller hub and motor, eliminating the need for sheet metal blanks by filling the gap between them with adhesive, which also provides centering and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a press fit with sheet metal blank is used to connect impeller to motor, then mechanical stability and strength are ensured, but additional parts and manufacturing complexity are required
Solution Approach 1:
The invention extracts and removes the sheet metal blank from the connection system, replacing it with an adhesive medium. The adhesive is injected directly into the clearance space between the impeller hub and motor rotor, eliminating the need for the separate metal reinforcement component while maintaining connection strength.
Solution Approach 2:
The invention changes the connection mechanism from mechanical (press fit with metal blank) to chemical/physical (adhesive bonding). By utilizing the adhesive medium's bonding properties and filling the clearance space, the connection strength is maintained through different physical-chemical parameters rather than mechanical interlocking.
2Strength
If clearance between impeller and motor is minimized for press fit, then connection strength is improved, but manufacturing precision requirements increase
Solution Approach 1:
The adhesive medium acts as an intermediary substance that fills the clearance space between the impeller hub and motor rotor. This intermediary allows for a deliberate clearance (0.05-3 mm) to exist while still achieving a secure connection, as the adhesive bonds the two components across this gap rather than requiring direct mechanical contact.
3Device complexity
If adhesive medium is used to fill the gap between impeller and motor, then additional parts are eliminated, but connection reliability may be compromised
Solution Approach 1:
The invention merges the functions of the sheet metal blank and the adhesive medium into a single adhesive-based connection system. The adhesive medium simultaneously provides bonding, fills the clearance space, and eliminates the need for separate metal reinforcement parts, combining multiple functions into one substance.
Solution Approach 2:
The connection system utilizes composite material properties by employing an adhesive medium that combines chemical bonding capabilities with physical filling of the clearance space. This composite approach (chemical + physical bonding) replaces the mechanical metal blank while achieving comparable or superior connection reliability.
4Object-generated harmful factors
If centering is precisely achieved for press fit connection, then imbalance is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The adhesive medium provides self-centering functionality by uniformly filling the clearance space around the impeller hub. As the adhesive cures, it naturally distributes forces evenly around the circumference, automatically compensating for minor misalignments and reducing imbalance without requiring complex external centering mechanisms.
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 simplifies production, reduces material costs, and ensures a secure, stress-free connection without the need for additional stabilization, while minimizing imbalances by using centering webs and an annular space filled with adhesive medium.
Implementation Method 1
the connection of the impeller to the motor results from physical and/or chemical interactions between an adhesive medium and the mutually facing contact surfaces of the impeller hub and the motor
Data Source
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AI summary
An arrangement of an impeller wheel (1) on an electric motor, in particular on an external-rotor motor (8), wherein the torque of the motor is transferred to the impeller wheel (1) by a conjoint rotary connection between the rotor (8) of the motor and the impeller wheel (1) and/or the impeller wheel hub (3) thereof, is characterised in that the connection of the impeller wheel (1) to the motor (8) is the result of physical and/or chemical interactions between an adhesive medium (10) and the mutually facing contact surfaces (5) of the impeller wheel hub (3) and of the motor (8), wherein the adhesive medium (10) at least partially fills an intermediate space (9) formed by the play between the impeller wheel (1) and the motor (8).