Portable Blower Coprime Blade Configuration Reduces Vibration
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Solution Overview
Problem
Existing portable blowers suffer from excessive structural vibrations and high noise levels during operation, which negatively impact the efficiency and quality of the air flow, particularly when the number of impeller blades and stabilizer blades have common multiples or sub-multiples, leading to decreased airflow homogeneity and linearity.
Innovation Solution
A portable blower design featuring an axial rotor with a central portion and peripheral blades, paired with an axial straightening stator having a different number of peripheral blades that are coprime, reducing vibrations and noise by ensuring the airflow is straightened without turbulence, with specific blade configurations and arrangements to minimize blade count differences and optimize airflow quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of impeller blades and stabilizer blades have common multiples or sub-multiples, then the structure is simpler to manufacture, but excessive vibrations and noise are generated
Solution Approach 1:
The patent applies parameter changes by specifically selecting the number of blades on the impeller and stabilizer such that they have no common multiples or sub-multiples. This numerical parameter optimization eliminates resonance conditions that cause excessive vibrations and noise, while maintaining manufacturability through standard blade counting methods.
2Ease of manufacture
If the number of impeller blades and stabilizer blades have common multiples or sub-multiples, then the structure is simpler to manufacture, but airflow homogeneity and linearity decrease
Solution Approach 1:
The patent optimizes the blade count parameters to be coprime (no common multiples or sub-multiples), which creates more uniform distribution of airflow patterns through the stabilizer. This parameter selection improves airflow homogeneity and linearity by preventing periodic disturbances that would occur with resonant blade configurations.
3Productivity
If the number of revolutions of the rotating axial impellers increases, then the blowing intensity increases, but structural vibrations and noise increase
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the impeller and stabilizer blade counts to have no common multiples or sub-multiples before operation begins. This preventive design choice eliminates the resonance conditions that would be exacerbated by high-speed rotation, allowing the blower to operate at high revolutions with minimal vibrations and noise.
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 design significantly reduces vibrations and noise while enhancing airflow efficiency and homogeneity, ensuring a high-quality, linear air flow without excessive turbulence, thereby improving operational performance.
Implementation Method 1
the axial impellers produce a swirling air flow
Implementation Method 2
stabilizers or blade straighteners, which have the primary purpose of straightening the swirling air flow produced by the axial impellers
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A blower (1) comprises: a structure (2) defining a conduit (3) for the transit of an air flow between a suction zone (4) and a blowing opening (10); a flow generator (6) operatively arranged inside the structure (2) which is switchable between a non-operating condition, in which no air flow is generated along the conduit (3) and an operating condition, in which an air flow is generated along the conduit (3). The flow generator (6) comprises a rotor (7) operatively arranged inside the conduit (3) and arranged to rotate about a rotation axis (Y). The rotor (7) is provided with a central portion (7a) and a plurality of blades (7b) distributed around the central portion (7a). The flow generator (6) also comprises a straightening stator (8) operatively arranged inside the conduit (3) between the rotor (7) and the blowing opening (10) to straighten the air flow generated by the rotor (7) when the flow generator (6) is in the operating condition. The straightening stator (8) comprises a central portion (9) and a plurality of straightening blades (11) circumferentially distributed around the central portion (9). The total number of straightening blades (11) of the straightening stator (8) differs from the total number of blades (7b) of the rotor (7) and are coprime.