Variable-Outlet Blower for Compact High-Force and High-Pressure Airflow
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Solution Overview
Problem
Existing electric blowers are large in the extension direction of their rotational axis due to multiple centrifugal fans, compromising usability and requiring a more compact design without sacrificing blowing force or pressure.
Innovation Solution
A single centrifugal fan blower with a high-speed motor capable of 50,000 to 120,000 rpm, operable in modes that adjust blowing force or dynamic pressure based on discharge opening area, allowing for a compact design and versatile operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple centrifugal fans are used to increase blowing force, then the blowing force is improved, but the length in the rotational axis direction increases
Solution Approach 1:
The patent divides the blowing function into two independent parts: one centrifugal fan handles the blowing force requirement, while another centrifugal fan handles the pressure requirement. This segmentation allows each fan to be optimized for its specific function, avoiding the need for a single oversized fan or multiple fans stacked in the rotational axis direction, thus reducing the overall length.
Solution Approach 2:
The patent transitions from a single-fan configuration (one-dimensional solution) to a two-fan configuration where fans are arranged in parallel (two-dimensional arrangement). This dimensional change allows the system to achieve both high blowing force and high pressure without extending the rotational axis length, as the fans operate side-by-side rather than end-to-end.
2Length of moving object
If a single centrifugal fan is used to reduce size, then the length is reduced, but achieving both high blowing force and high pressure becomes difficult
Solution Approach 1:
The patent creates a universal blower system where two centrifugal fans work together to simultaneously provide both high blowing force and high pressure. The first fan is optimized for blowing force while the second fan is optimized for pressure, and their combined operation makes the system adaptable to various applications requiring either or both characteristics, effectively achieving multi-functionality.
Solution Approach 2:
The patent utilizes parameter changes by operating the two centrifugal fans at different rotational speeds independently. This allows the system to adjust the contribution of each fan to the overall performance, enabling the blower to adapt to different operational requirements and achieve both high blowing force and high pressure when needed.
3Stress or pressure
If high rotational speed motor is used to achieve high pressure, then the dynamic pressure is improved, but the blowing force may be reduced
Solution Approach 1:
The patent segments the performance requirements by assigning different functional roles to two centrifugal fans. One fan is specifically optimized for generating blowing force, while the other is optimized for generating dynamic pressure. This segmentation allows the system to achieve both high pressure and high blowing force simultaneously without compromising either parameter.
Solution Approach 2:
The patent employs parameter changes by independently controlling the rotational speeds of the two centrifugal fans. This independent control allows the system to adjust the balance between blowing force and dynamic pressure output, enabling optimization for either parameter depending on the specific application requirements.
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 blower achieves a compact size with high blowing force and dynamic pressure, enhancing usability by allowing users to select the appropriate mode for their needs through adjustable discharge opening and rotational speed.
Implementation Method 1
a single fan that is configured to rotate in response to rotation of the motor shaft to discharge air through the discharge opening
Implementation Method 2
a motor having a maximum rotational speed within a range of 50,000 rpm to 120,000 rpm
Data Source
AI summary
A blower includes a body, a motor, and a single fan configured to rotate in response to rotation of a motor shaft to discharge air through a discharge opening. The maximum rotational speed of the motor shaft is within a range of 50,000 rpm to 120,000 rpm. An area of the discharge opening is changeable by a user. The blower is configured to selectively operate in a first mode or in a second mode according to the area of the discharge opening. In the first mode, the maximum blowing force of the air discharged through the opening is within a range of 2.5 N to 5.0 N when the motor is driven at the maximum rotational speed. In the second mode, the maximum dynamic pressure of the air discharged is within a range of 30 kPa to 65 kPa when the motor is driven at the maximum rotational speed.