Hair dryer and control method thereof

Abstract

Disclosed are a hair dryer and a control method thereof. The hair dryer comprises a housing, a control board, a negative pressure assembly, a first heating element, a second heating element, and a stepless adjustment assembly. An air duct is formed in the housing; the control board is arranged on the housing; the negative pressure assembly is arranged in the air duct; the negative pressure assembly is electrically connected to the control board; the first heating element and the second heating element are both arranged in the air duct; and, the first heating element and the second heating element are both electrically connected to the control board; the stepless adjustment assembly is arranged on the housing, and electrically connected to the control board.

What is claimed is: 
     
         1 . A hair dryer, wherein comprising:
 a housing, an air duct is formed in the housing;   a control board arranged on the housing;   a negative pressure assembly arranged in the air duct and configured to sucking and accelerating fluid; the negative pressure assembly is electrically connected to the control board;   a first heating element and a second heating element both arranged in the air duct for heating the fluid; the first heating element and the second heating element are both electrically connected to the control board; and   a stepless adjustment assembly arranged on the housing, the stepless adjustment assembly is electrically connected to the control board to transmit a control signal to the control board to steplessly adjust a suction power of the negative pressure assembly, a current value of the first heating element and a current value of the second heating element.   
     
     
         2 . The hair dryer according to  claim 1 , wherein the housing comprises a grip portion and a nozzle, a front end of the grip portion is docked with the nozzle, an air inlet is formed at a rear end of the grip portion, and the air inlet communicates with a first channel formed in the grip portion; an air outlet is formed at a front end of the nozzle, and the air outlet communicates with a second channel formed in the nozzle; the air inlet, the first channel, the second channel and the air outlet are connected in sequence, and jointly forming the air duct;
 the control board and the stepless adjustment assembly are arranged on the grip portion, the negative pressure assembly is arranged in the first channel; the first heating element and the second heating element are arranged in the second channel along a direction of fluid flow.   
     
     
         3 . The hair dryer according to  claim 2 , wherein a sinking groove is formed on the grip portion, a top surface of the sinking groove is flush with an outer surface of the grip portion, and a bottom of the sinking groove sinks into the first channel; a storage compartment with a top opening is formed in the sinking groove, and the storage compartment is used to accommodate the control board and the stepless adjustment assembly. 
     
     
         4 . The hair dryer according to  claim 3 , wherein the stepless adjustment assembly comprises a circuit board, a stepless encoder and an adjusting roller; the circuit board is arranged in the storage compartment and is electrically connected to the control board; the stepless adjustment encoder is arranged on the circuit board, and a rotating shaft of the stepless encoder is sleeved with the adjusting roller; and the adjusting roller is at least partially protruded out of the opening of the storage compartment. 
     
     
         5 . The hair dryer according to  claim 3 , wherein a sinking depth of the sinking groove in the first channel is 5-20 mm. 
     
     
         6 . A control method for the hair dryer according to  claim 1 , wherein the control board is provided with a gear selection button, and the gear selection button is connected to control circuits of the first heating element and the second heating element; the control method comprising:
 determining a current working mode of the hair dryer according to a gear position of the gear selection button;   controlling, through the control board, the negative pressure assembly, the first heating element and the second heating element to work according to the working mode.   
     
     
         7 . The control method according to  claim 6 , wherein the step of controlling, through the control board, the negative pressure assembly, the first heating element and the second heating element to work according to the working mode comprising:
 if the current working mode of the hair dryer is determined to be a variable temperature mode, turning on the negative pressure assembly, the first heating element and the second heating element through the control board;   simultaneously increasing or decreasing, through the control board, an output power of the negative pressure assembly, the first heating element and the second heating element according to a received adjusting signal of the stepless adjustment assembly.   
     
     
         8 . The control method according to  claim 6 , wherein the step of controlling, through the control board, the negative pressure assembly, the first heating element and the second heating element to work according to the working mode comprising:
 if the current working mode of the hair dryer is determined to be a normal temperature mode, turning off the first heating element and the second heating element through the control board;   adjusting, through the control board, the output power of the negative pressure assembly according to the received adjusting signal of the stepless adjustment assembly.   
     
     
         9 . The control method according to  claim 6 , wherein the step of controlling, through the control board, the negative pressure assembly, the first heating element and the second heating element to work according to the working mode comprising:
 if the current working mode of the hair dryer is determined to be a constant temperature mode, turning on the first heating element or the second heating element to a maximum output power according to a constant temperature gear, or simultaneously turning on the first heating element and the second heating element to the maximum output power;   adjusting, through the control board, the output power of the negative pressure assembly according to the received adjusting signal of the stepless adjustment assembly.   
     
     
         10 . The control method according to the  claim 6 , wherein after the step of controlling, through the control board, the negative pressure assembly, the first heating element and the second heating element to work according to the working mode, further comprising:
 if the current working mode of the hair dryer is the variable temperature mode or the constant temperature mode, counting a working time of the hair dryer;   determining whether the working time of the hair dryer is exceeded a preset safe working time;   if the working time of the hair dryer is determined to be exceeded the preset safe working time, disconnecting the circuit, and turning off the negative pressure assembly, the first heating element and the second heating element.