Multiblade Air Blower Axial Offset Design
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Solution Overview
Problem
Conventional multiblade air blowers experience backflow and airflow disturbance, leading to inefficiencies and increased noise due to the axial overlay of blades and orifices, which existing designs fail to adequately address.
Innovation Solution
The multiblade air blower incorporates an axially overlaid portion and an airflow collision prevention device, with the orifice inner diameter larger than the blade inner diameter, and a notched or forward-tilted portion to prevent airflow collisions and backflow, enhancing air distribution efficiency and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If blade ends and orifice are axially overlaid in conventional multiblade air blowers, then the structure is simple, but backflow occurs from scroll chamber to air intake space and airflow disturbance increases at high air volume
Solution Approach 1:
The patent positions the open end of the orifice axially ahead of the blade end face, creating a dimensional offset in the axial direction. This spatial arrangement prevents the airflow exiting the orifice from directly colliding with the blade end face, thereby eliminating backflow and airflow disturbance while maintaining structural simplicity without requiring complex additional components.
2Productivity
If orifice inner diameter is larger than blade inner periphery, then airflow to blade tips is enhanced, but backflow occurs from scroll chamber to air intake space
Solution Approach 1:
The open end of the orifice is positioned axially ahead of the blade end face before the airflow reaches the blade tips. This preliminary positioning allows the airflow to be guided smoothly along the blade end face in the rotational direction, preventing backflow from occurring while still allowing enhanced airflow to reach the blade tips for improved productivity.
3Ease of manufacture
If conventional multiblade structure is used, then manufacturing is simple, but noise increases due to airflow disturbance at high air volume
Solution Approach 1:
By offsetting the orifice open end axially from the blade end face, the patent creates a three-dimensional airflow path that guides air smoothly along the blade end face. This dimensional arrangement eliminates turbulent airflow and vortex formation that cause noise, while maintaining manufacturing simplicity as the change only requires adjusting the relative axial positioning of existing components.
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 effectively suppresses backflow and airflow disturbance, improving air distribution efficiency and reducing noise generation while maintaining a simple and cost-effective structure.
Implementation Method 1
scroll casing houses the multiblade impeller, and guides air taken in from front inlet of multiblade impeller in centrifugal direction
Data Source
AI summary
A multiblade air blower has a multiblade impeller, an orifice, an axially overlaid portion, and an airflow collision prevention device. The multiblade impeller includes a main plate and a blade. The blade is provided at the main plate to form a blade inner periphery. The orifice has an open end and an orifice inner periphery. The open end is positioned toward the main plate from a blade end face. The orifice inner periphery has an inner diameter larger than that of the blade inner periphery, and guides air to the multiblade impeller. The axially overlaid portion is a part where the orifice and the blades are overlaid. The airflow collision prevention device is provided at the blade and at an inner side of the orifice inner periphery. The multiblade air blower suppresses loss of air distribution efficiency and increased noise.