Local ventilation equipment and blower therein
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Solution Overview
Problem
Existing centrifugal blowers in range hoods face challenges in accommodating new motors without design changes due to interference issues, limiting the use of thinner, lighter, and more powerful motors that provide lower noise, and requiring significant time and cost for design alterations.
Innovation Solution
The blower design features a driving unit installed outside the scroll housing, using a BLDC motor with a rotor and stator in a motor case, connected by a shaft to the impeller, allowing for compatibility with various impeller sizes without additional design changes, and forming a passage between the driving unit and scroll housing to reduce noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor is installed inside the impeller to reduce the volume occupied by the centrifugal blower, then the compactness of the blower is improved, but the adaptability of different motor types is worsened due to interference between the motor and impeller
Solution Approach 1:
The motor is extracted from the interior space of the impeller and installed in the space between the main body and scroll housing. This extraction eliminates the interference problem between the motor and impeller, allowing use of various motor types without design changes, while still achieving compact overall structure through optimized spatial arrangement
Solution Approach 2:
The motor installation location is changed from the radial dimension (inside impeller) to the axial dimension (between main body and scroll housing). This dimensional shift resolves the spatial interference issue while maintaining compact blower volume through efficient use of available three-dimensional space
2Power
If a new motor with different shape and size is used to provide lower noise and higher power, then the performance of the blower is improved, but the device complexity increases due to required design alterations
Solution Approach 1:
The motor mounting structure is designed with universal compatibility, allowing different types of motors (brushless DC motors, brush motors, etc.) to be installed without design changes. The mounting structure serves multiple functions: securing the motor, accommodating various motor shapes and sizes, and eliminating the need for custom design for each motor type
Solution Approach 2:
The blower is segmented into independent functional modules: the impeller module, the motor module, and the housing module. This segmentation allows the motor to be independently selected and replaced without affecting other components, reducing design complexity and enabling easy upgrades to higher-performance motors
3Ease of manufacture
If the motor is installed inside the impeller to achieve compact structure, then the ease of manufacture is improved, but the harmful factors increase due to interference and restricted airflow passage
Solution Approach 1:
The space that would be occupied by the motor inside the impeller is converted into a beneficial air passage. By installing the motor externally, the interior space of the impeller remains clear for optimal airflow, and the motor installation space between main body and scroll housing is utilized efficiently, transforming a potential constraint into a performance advantage
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 configuration enables the use of general-purpose motors across different blower sizes without design changes, improving suction performance, reducing noise and vibration, and saving time and cost associated with design modifications.
Implementation Method 1
a blower designed with a driving unit installed outside a scroll housing, a turbo fan impeller having a rotation shaft connected to a rotor of the driving unit
Implementation Method 2
the centrifugal blower uses centrifugal force and has an impeller located in a scroll housing. In such a centrifugal blower, the flow at the inlet of the impeller is in parallel with the rotation shaft while the flow at the outlet of the impeller is perpendicular to the rotation shaft
Data Source
AI summary
Disclosed herein are a local ventilation equipment and a blower therein. The local ventilation equipment includes: a main body having an intake port in a bottom and an interior area therein; and a blower installed in the interior area of the main body to generate air flow that sucks outside air into the main body through the intake port. The blower comprises an impeller that rotates on a shaft extending laterally and has therein a space to which air sucked through a side is introduced; a scroll housing that accommodates the impeller and has a suction hole formed on a side via which outside air is introduced into the space; and a driving unit that is installed in a space between the main body and the scroll hosing to supply power to rotate the impeller.