Hair dryer having reverse blowing dust-removal function

A hair dryer having a reverse blowing dust-cleaning function, comprising:

• a housing, an air machine module, an air inlet, and an air outlet, the air inlet and the air outlet are arranged on the housing, a through airflow channel is formed between the air inlet and the air outlet in the housing, the air machine module is arranged in the through airflow channel of the housing,
• wherein a circuit control board is arranged in the housing, the circuit control board is connected to the air machine module, and a trigger portion is arranged on the housing, the trigger portion is connected to the circuit control board for controlling the air machine module to rotate forward or in reverse,
• wherein a microcontroller is provided on the circuit control board, a power drive module is provided in the housing, the power drive module is connected to the air machine module, the microcontroller is connected to the power drive module, and the trigger portion is connected to the microcontroller,
• wherein the trigger portion comprises a reverse button and a forward button that are arranged on the housing and connected to the microcontroller, the microcontroller responds to a forward rotation signal output by the forward button to control, by the power drive module, the air machine module to rotate forward, the microcontroller responds to a reverse signal output by the reverse button to control, by the power drive module, the air machine module to rotate in reverse, and the microcontroller responds to the reverse signal output by the reverse button only when the forward button is not triggered, and
• wherein the microcontroller is connected to a current detection circuit and a rotate speed detection circuit, the current detection circuit is connected to the power drive module for detecting a current input current of the air machine module, and the rotate speed detection circuit is connected to the air machine module for detecting a current rotate speed of the air machine module;
• the microcontroller is configured to control the hair dryer to enter a dust-cleaning detection mode, in the dust-cleaning detection mode, based on the current rotate speed and the current input current of the air machine module when the forward button is triggered, the microcontroller compares the current input current at the current rotate speed with a rated input current at a rated rotate speed to control the air machine module to enter a to-be-cleaned state;
• and in the to-be-cleaned state, the microcontroller controls the air machine module to rotate in reverse after a preset time for which the forward button is not triggered.