Single-Fan Blower With Adjustable Outlet for Force-Pressure Switching
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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, limiting their usability and requiring a more compact design without compromising blowing force.
Innovation Solution
A single centrifugal fan blower with a high-speed motor capable of rotating between 50,000 rpm to 120,000 rpm, allowing operation in two modes: a first mode with a blowing force of 2.5 N to 5.0 N and a second mode with dynamic pressure of 30 kPa to 65 kPa, adjustable by changing the discharge opening area or using interchangeable nozzles.
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 blower is divided into two functional segments: a high-speed motor segment that generates rotational force and a single fan segment that converts this to air flow. This segmentation allows the blowing force to be generated through high-speed rotation rather than multiple fans, reducing the length in the rotational axis direction.
Solution Approach 2:
The patent replaces the mechanical system of multiple centrifugal fans with a high-speed motor-fan system. Instead of using multiple fans to generate blowing force, the invention uses a single fan driven by a high-speed motor, substituting mechanical fan multiplication with motoric acceleration to achieve the same blowing force with reduced length.
2Length of moving object
If a single fan is used to reduce size, then the length is reduced, but the blowing force may be insufficient
Solution Approach 1:
The patent changes the operational parameters by increasing the motor rotational speed to 50,000-120,000 rpm. This parameter change allows a single fan to generate sufficient blowing force, as the high-speed rotation creates the necessary centrifugal force to move air effectively, eliminating the need for multiple fans while maintaining adequate blowing force.
3Force
If high-speed motor is used to increase blowing force, then the blowing force is improved, but the motor size may increase
Solution Approach 1:
The patent employs a high-speed motor that operates dynamically at very high rotational speeds (50,000-120,000 rpm). This dynamic operation allows the motor to generate sufficient blowing force through rapid rotation rather than through large physical size. The high-speed rotation creates effective centrifugal force with a compact motor design, balancing blowing force generation with size reduction.
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 pressure, enhancing usability by allowing users to select the appropriate mode based on the operation, while maintaining efficient air discharge.
Implementation Method 1
The motor includes a motor body, which includes a stator and a rotor, and a motor shaft, which is configured to rotate integrally with the rotor
Implementation Method 2
a fan, which is configured to rotate in response to rotation of the motor shaft to discharge air through the discharge opening
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.