Electronic cigarette

Abstract

An electronic cigarette includes an airflow sensing part, a first pressure change unit, a second pressure change unit, an outlet assembly, a pneumatic switch, and a heating element. The heating element is disposed in the first pressure change unit. The pneumatic switch is disposed in the airflow sensing part to activate the heating element to work. The airflow sensing part communicates with the second pressure change unit. The first pressure change unit and the second pressure change unit separately communicate with the outlet assembly.

What is claimed is: 
     
         1 . An electronic cigarette, comprising:
 an airflow sensing part;   a first pressure change unit;   a second pressure change unit;   an outlet assembly;   a pneumatic switch; and   a heating element;   
       wherein:
 the heating element is disposed in the first pressure change unit; 
 the pneumatic switch is disposed in the airflow sensing part to activate the heating element to work; 
 the airflow sensing part communicates with the second pressure change unit; and 
 the first pressure change unit and the second pressure change unit separately communicate with the outlet assembly. 
 
     
     
         2 . The electronic cigarette of  claim 1 , wherein the airflow sensing part further communicates with the first pressure change unit. 
     
     
         3 . The electronic cigarette of  claim 1 , wherein the electronic cigarette comprises one outlet assembly, and the first pressure change unit and the second pressure change unit separately communicate with the one outlet assembly; or the electronic cigarette comprises two outlet assemblies independent of each other, and the two outlet assemblies communicate with the first pressure change unit and the second pressure change unit, respectively. 
     
     
         4 . The electronic cigarette of  claim 1 , wherein both the first pressure change unit and the second pressure change unit comprise hollow channels; the first pressure change unit comprises a first outlet communicating with the outlet assembly and the second pressure change unit comprises a second outlet communicating with the outlet assembly; and a cross-sectional area of the first outlet is 3-200 times that of the second outlet. 
     
     
         5 . The electronic cigarette of  claim 2 , wherein the electronic cigarette further comprises a housing and an atomizer; the atomizer comprises an e-liquid tank dispose in the housing; a first channel is formed between an inner wall of the housing and an outer wall of the e-liquid tank. 
     
     
         6 . The electronic cigarette of  claim 5 , wherein the e-liquid tank is hollow; and two ends of the e-liquid tank are provided with a first seal and a second seal, respectively. 
     
     
         7 . The electronic cigarette of  claim 6 , wherein the e-liquid tank comprises a first cavity for storing e-liquid; a mouthpiece cover is disposed on one side of the first seal away from the first cavity; a second channel is formed between the mouthpiece cover and the first seal; the second channel communicates with the first channel, thereby forming the second pressure change unit. 
     
     
         8 . The electronic cigarette of  claim 7 , wherein
 an air tube is inserted in the e-liquid tank; the first cavity is formed by an outer wall of the air tube, an inner wall of the e-liquid tank, the first seal, and the second seal; and the heating element is disposed in the air tube; and   the first seal and the second seal each comprise a through hole; one end of the air tube is inserted into the through hole of the first seal and the other end of the air tube is inserted into the through hole of the second seal; and a third channel is formed by the through hole of the first seal, the through hole of the second seal, and an inner passage of the air tube.   
     
     
         9 . The electronic cigarette of  claim 8 , wherein the mouthpiece cover is disposed on one end of the housing and comprises an inhaling port disposed opposite to the third channel; and the outlet assembly comprises the inhaling port communicating with the second channel and the third channel. 
     
     
         10 . The electronic cigarette of  claim 7 , wherein a battery is disposed one side of the second seal away from the first cavity; a fourth channel is formed between the battery and the second seal; the third channel communicates with the fourth channel to form the first pressure change unit. 
     
     
         11 . The electronic cigarette of  claim 10 , wherein the battery is disposed in the housing; a fifth channel is formed between an outer wall of the battery and the inner wall of the housing; both the first channel and the fourth channel communicate with the fifth channel; the fifth channel is disposed opposite to the first channel. 
     
     
         12 . The electronic cigarette of  claim 11 , wherein the housing comprises a bottom end and an air inlet disposed on the bottom end; a sixth channel is formed between the air inlet and the fifth channel; the pneumatic switch is disposed in the fifth channel or the sixth channel; the fifth channel, the sixth channel, and the air inlet are connected one by one to form the airflow sensing part.