Atomizer and aerosol generating device

Abstract

An atomizer and an aerosol generating device are provided. The atomizer includes a liquid storage member with a liquid storage cavity formed therein for storing an aerosol-forming substrate; and an atomizing housing at least partially received in the liquid storage cavity. A liquid storage space is formed inside the atomizing housing. The atomizing housing is provided with an air guiding hole configured for communicating an upper portion of the liquid storage space with an outside atmosphere. The atomizing housing is further provided with a pressure relief hole communicating the liquid storage space with the liquid storage cavity. When an air pressure in the liquid storage cavity is greater than an external air pressure and a positive pressure difference is formed, the aerosol-forming substrate in the liquid storage cavity is squeezed by the positive pressure difference into the liquid storage space through the pressure relief hole.

What is claimed is: 
     
         1 . An atomizer for an aerosol generating device, the atomizer comprising:
 a liquid storage member with a liquid storage cavity formed therein for storing an aerosol-forming substrate; and   an atomizing housing at least partially received in the liquid storage cavity;   wherein a liquid storage space is formed inside the atomizing housing, the atomizing housing is provided with an air guiding hole configured for communicating an upper portion of the liquid storage space with an outside atmosphere, and the atomizing housing is further provided with a pressure relief hole communicating the liquid storage space with the liquid storage cavity; when an air pressure in the liquid storage cavity is greater than an external air pressure and a positive pressure difference is formed, the aerosol-forming substrate in the liquid storage cavity is squeezed by the positive pressure difference into the liquid storage space through the pressure relief hole.   
     
     
         2 . The atomizer according to  claim 1 , wherein when the air pressure in the liquid storage cavity is less than the external air pressure and a negative pressure difference is formed, the aerosol-forming substrate in the liquid storage space is squeezed by the negative pressure difference back into the liquid storage cavity through the pressure relief hole. 
     
     
         3 . The atomizer according to  claim 1 , wherein the atomizing housing comprises a base and an upper cover, an upper end face of the base is recessed to form an atomizing groove, the upper cover covers a groove opening of the atomizing groove, so that an atomizing cavity is formed inside the base, an inner bottom surface of the atomizing groove is recessed to form a liquid storage groove, and the liquid storage groove constitutes the liquid storage space, the pressure relief hole and the air guiding hole are both provided on the base. 
     
     
         4 . The atomizer according to  claim 3 , wherein a protrusion is formed and protrudes on an inner bottom surface of the liquid storage groove, the portion of the liquid storage groove other than the protrusion defines the liquid storage space, an air guiding passage is provided in the protrusion, an air inlet end of the air guiding passage is in communication with the air guiding hole, an air outlet end of the air guiding passage is located at an upper end face of the protrusion, and the air outlet end of the air guiding passage is in communication with the liquid storage space. 
     
     
         5 . The atomizer according to  claim 3 , wherein the atomizer further comprises a first sealing member provided in the liquid storage groove, the first sealing member comprises a sealing seat covering a bottom of the liquid storage groove and a protrusion protruding from a surface of the sealing seat facing the upper cover, the portion of the liquid storage groove other than the sealing seat and the protrusion defines the liquid storage space, an air guiding passage is provided in the first sealing member, an air inlet end of the air guiding passage is located at the sealing seat, and the air inlet end of the air guiding passage is in communication with the air guiding hole, an air outlet end of the air guiding passage is located at an upper end face of the protrusion, and the air outlet end of the air guiding passage is in communication with the liquid storage space. 
     
     
         6 . The atomizer according to  claim 5 , wherein the atomizing housing further comprises a heating member for heating the aerosol-forming substrate, the sealing seat is provided with a through hole for a lead wire of the heating member to pass through, the heating member is located in the atomizing cavity, the lead wire of the heating member passes through the through hole and extends to an outside of the liquid storage groove. 
     
     
         7 . The atomizer according to  claim 4 , wherein a height of the protrusion is greater than or equal to a height of the pressure relief hole. 
     
     
         8 . The atomizer according to  claim 5 , wherein a height of the protrusion is greater than or equal to a height of the pressure relief hole. 
     
     
         9 . The atomizer according to  claim 4 , wherein the base is provided with a liquid holding groove, a height of a groove opening of the liquid holding groove is lower than a height of the air guiding hole, and the liquid holding groove is located under the air inlet end of the air guiding passage. 
     
     
         10 . The atomizer according to  claim 5 , wherein the base is provided with a liquid holding groove, a height of a groove opening of the liquid holding groove is lower than a height of the air guiding hole, and the liquid holding groove is located under the air inlet end of the air guiding passage. 
     
     
         11 . The atomizer according to  claim 3 , wherein an outer wall of the base is provided with an annular groove around a circumference of the base, the pressure relief hole is located in the annular groove, a second sealing member is disposed in the annular groove, the second sealing member is configured to seal the pressure relief hole when the air pressure in the liquid storage cavity is equal to the external air pressure; when the air pressure in the liquid storage cavity is greater than the external air pressure and a positive pressure difference is formed, or when the air pressure in the liquid storage cavity is less than the external air pressure and a negative pressure difference is formed, the second sealing member is squeezed by the positive pressure difference or the negative pressure difference to open the pressure relief hole. 
     
     
         12 . The atomizer according to  claim 11 , wherein a gap is preset between a surface of the second sealing member facing the upper cover and an inner surface of the annular groove facing the base. 
     
     
         13 . The atomizer according to  claim 12 , wherein a spacing of the gap is 0.03 mm-0.05 mm. 
     
     
         14 . The atomizer according to  claim 3 , wherein an atomizing assembly is provided in the atomizing cavity, the base and/or the upper cover is provided with a liquid inlet hole communicating the liquid storage cavity with the atomizing cavity, the aerosol-forming substrate in the liquid storage cavity flows into the atomizing cavity through the liquid inlet hole to be heated and atomized by the atomizing assembly received in the atomizing cavity. 
     
     
         15 . The atomizer according to  claim 1 , wherein the liquid storage member is provided with an open bottom end and a smoke outlet at a top end, the atomizing housing is sealed and assembled on a bottom opening of the liquid storage member, the atomizing housing is at least partially received in the liquid storage member, an atomizing cavity is formed inside the atomizing housing, the atomizing housing is provided with a smoke guiding hole in communication with the atomizing cavity, a vent tube communicating the smoke guiding hole with the smoke outlet is provided in the liquid storage member, an inside space of the liquid storage member other than the atomizing housing and the vent tube defines the liquid storage cavity, the atomizing housing is provided with a liquid inlet hole communicating the liquid storage cavity with the atomizing cavity. 
     
     
         16 . An aerosol generating device, comprising an atomizer and a power supply device for supplying power to the atomizer, the atomizer being assembled to the power supply device, wherein the atomizer is the atomizer according to  claim 1 .