Suction unit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing suction units generate noise due to the operation of the suction motor, and external resonators can increase flow noise by creating vortices, limiting their effectiveness in noise reduction.
Innovation Solution
A suction unit with a noise reduction unit integrated within the motor chamber, featuring air flow paths and communicating holes that direct sound waves into noise reduction chambers, reducing noise generation and minimizing frequency changes, thereby preventing swirl-induced flow noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a resonator is provided outside the motor chamber, then noise of specific frequency is reduced, but flow noise increases due to vortex generation at the resonator inlet
Solution Approach 1:
The noise reduction unit is integrated inside the motor chamber, merging the noise reduction function with the motor housing structure. This eliminates the separate external resonator that caused vortex generation, while maintaining the noise reduction capability through internal communication holes and noise reduction chambers.
Solution Approach 2:
Communication holes serve as intermediaries that allow sound waves to enter the noise reduction chambers while maintaining separation between the air flow path and noise reduction chambers. This mediates the interaction between airflow and noise reduction without causing vortex generation.
2Object-affected harmful factors
If the noise reduction unit is integrated within the motor chamber, then noise reduction capability is enhanced, but device complexity increases
Solution Approach 1:
The motor chamber serves multiple functions: it houses the motor, provides structural support, and acts as a noise reduction chamber. The communication holes serve dual purposes of allowing airflow while enabling sound wave entry into noise reduction chambers, reducing the need for separate components.
Solution Approach 2:
The noise reduction unit is nested within the motor chamber, with noise reduction chambers positioned inside the motor chamber space. This nested arrangement allows the noise reduction system to be housed within the existing motor chamber boundaries without requiring additional external space.
3Object-generated harmful factors
If multiple communicating holes are formed in the guide body, then swirl-induced flow noise is prevented, but manufacturing complexity increases
Solution Approach 1:
Multiple communicating holes are distributed at different positions and orientations in the guide body to locally address swirl generation at various points. This distributed arrangement prevents swirl-induced flow noise by disrupting vortex formation at multiple locations simultaneously.
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 integrated noise reduction unit effectively reduces noise generated by the suction motor without increasing the unit's size, achieving enhanced noise reduction by minimizing frequency changes and preventing swirl-induced noise, while maintaining airflow efficiency.
Implementation Method 1
a noise reduction unit which surrounds the suction motor and acts as a resonator in order to reduce noise generated during the operation of the suction motor
Data Source
AI summary
A suction unit includes a suction motor for generating air flow; a noise reduction unit which surrounds the suction motor and acts as a resonator in order to reduce noise generated during the operation of the suction motor; and a motor chamber which surrounds the noise reduction unit. The noise reduction unit includes an air flow path which provide a path of air flowing by the suction motor, a noise reduction chamber for eliminating the noise of at least one frequency band, and at least one communicating hole which causes sound wave of the noise to enter the noise reduction chamber. The air flow path is divided from the noise reduction chamber and thus the sound wave of the noise enters the noise reduction chamber through the communicating hole during a process in which air passes through the air flow path.