Reversible Fan Blade Structure for Bidirectional Airflow
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Solution Overview
Problem
Existing fans can only rotate in one direction, requiring disassembly and re-mounting for reverse airflow, and asymmetric blades cause reduced air pressure and volume in reverse rotation, leading to inefficient heat dissipation.
Innovation Solution
A forward and reverse rotation fan with symmetrical blades and a control mechanism allowing seamless direction change via a switch, utilizing a conductive FPC board and motor connection to maintain consistent air pressure and volume regardless of rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fan blades are designed with asymmetric profiles for optimal forward rotation performance, then air pressure and air volume in forward rotation are improved, but air pressure and air volume in reverse rotation deteriorate significantly
Solution Approach 1:
The patent applies asymmetry in reverse by using symmetrical blade profiles. The fan blades are designed with symmetrical cross-sections where the upper and lower surfaces are mirror images, allowing the blades to generate equivalent aerodynamic forces in both clockwise and counter-clockwise rotation directions, thus maintaining high air pressure and volume regardless of rotation direction
Solution Approach 2:
The symmetrical blade design enables the fan to universally perform its heat dissipation function in both rotation directions without requiring different blade configurations. The same blade structure serves both forward and reverse rotation modes effectively, making the fan adaptable to different airflow requirements
2Ease of operation
If a switch mechanism is added to enable reverse rotation control, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical switching mechanisms with an electronic control system. A simple push-button switch connected to a control circuit board electronically reverses the motor's rotation direction by swapping the phase sequence of the three-phase power supply, eliminating the need for mechanical linkages or complex switching mechanisms
Solution Approach 2:
The control circuit changes the electrical parameters (phase sequence) supplied to the motor to alter its rotation direction. By swapping any two phases of the three-phase power supply, the motor's magnetic field rotation direction reverses, thereby changing the fan blade rotation direction without mechanical intervention
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
Enables convenient direction switching without disassembly, maintains air pressure and volume consistency, and ensures efficient heat dissipation capacity in both directions.
Implementation Method 1
The conductive FPC board transmits power to the forward and reverse rotation motor to rotate the motor
Implementation Method 2
by operating the forward and reverse rotation switch, the contact points are connected to different circuit paths to control a flow direction of a current, thereby changing a direction of a magnetic field of the motor, and thus changing a rotation direction of the fan
Data Source
AI summary
A forward and reverse rotation fan includes a fan body. The fan body is internally arranged with forward and reverse rotation fan blades, the forward and reverse rotation fan blades are sleeved at an upper portion of a forward and reverse rotation motor, the forward and reverse rotation motor is connected to a conductive flexible printed circuit (FPC) board, the conductive FPC board is connected to a power lead, a back face of the forward and reverse rotation motor is arranged with a forward and reverse rotation switch, and the forward and reverse rotation switch is connected to and controls a motor. According to the above technical solution, a fan can be controlled to rotate forward or in reverse by manually toggling the forward and reverse rotation switch, with convenience in use for requiring no disassembly, and the fan is very suitable for devices with limited space for mounting fans.