An Induction Heating Assembly for an Aerosol Generating Device

Abstract

An induction heating assembly for an aerosol generating device includes a heating chamber for receiving at least part of an aerosol generating substrate, an induction coil positioned externally of the heating chamber for generating an electromagnetic field, an inductively heatable susceptor positioned inside the heating chamber at a periphery thereof externally of the aerosol generating substrate, and a temperature sensor in thermal contact with the inductively heatable susceptor. The inductively heatable susceptor is arranged with respect to the induction coil to be inductively heated by the generated electromagnetic field and has a geometric feature arranged to shield the temperature sensor from the generated electromagnetic field.

1 . An induction heating assembly for an aerosol generating device, the induction heating assembly comprising:
 a heating chamber for receiving at least part of an aerosol generating substrate;   an induction coil positioned externally of the heating chamber for generating an electromagnetic field;   an inductively heatable susceptor positioned inside the heating chamber at a periphery thereof and externally of the aerosol generating substrate, the inductively heatable susceptor being arranged with respect to the induction coil to be inductively heated by the generated electromagnetic field; and   a temperature sensor in thermal contact with the inductively heatable susceptor,   wherein the inductively heatable susceptor has a geometric feature arranged to shield the temperature sensor from the generated electromagnetic field.   
     
     
         2 . The induction heating assembly according to  claim 1 , wherein the temperature sensor is received within the geometric feature. 
     
     
         3 . The induction heating assembly according to  claim 2 , wherein the temperature sensor is a thermocouple and comprises a first thermocouple wire received within the geometric feature and a second thermocouple wire received within the geometric feature. 
     
     
         4 . The induction heating assembly according to  claim 1 , wherein the induction coil extends around the heating chamber. 
     
     
         5 . The induction heating assembly according to  claim 4 , wherein the heating chamber has a longitudinal axis defining a longitudinal direction, the inductively heatable susceptor is elongate in the longitudinal direction of the heating chamber, and the inductively heatable susceptor has an inner surface and an outer surface. 
     
     
         6 . The induction heating assembly according to  claim 5 , wherein the heating chamber comprises a chamber wall that defines an interior volume of the heating chamber, and wherein, when an aerosol generating substrate is received in the heating chamber, an inner air gap is provided between the inner surface of the inductively heatable susceptor and the aerosol generating substrate and an outer air gap is provided between the outer surface of the inductively heatable susceptor and the chamber wall. 
     
     
         7 . The induction heating assembly according to  claim 5 , wherein the geometric feature comprises a groove formed in the inner surface or the outer surface of the inductively heatable susceptor, the groove extends in the longitudinal direction, and the temperature sensor is positioned in the groove. 
     
     
         8 . The induction heating assembly according to  claim 7 , wherein the groove extends in the longitudinal direction from a location of the temperature sensor to an end of the inductively heatable susceptor. 
     
     
         9 . The induction heating assembly according to  claim 7 , wherein, when the groove is formed in the inner surface of the inductively heatable susceptor, the temperature sensor is recessed from the inner surface. 
     
     
         10 . The induction heating assembly according to  claim 7 , wherein, when the groove is formed in the outer surface of the inductively heatable susceptor, the temperature sensor is recessed from the outer surface. 
     
     
         11 . The induction heating assembly according to  claim 7 , wherein the groove is covered by an electrically conductive and non-magnetically permeable material strip to enclose the temperature sensor in the groove. 
     
     
         12 . The induction heating assembly according to  claim 5 , wherein the geometric feature comprises a channel arranged on the inner surface or the outer surface of the inductively heatable susceptor, the channel extends in the longitudinal direction, and the temperature sensor is positioned in the channel. 
     
     
         13 . The induction heating assembly according to  claim 12 , wherein the channel extends in the longitudinal direction from the location of the temperature sensor to an end of the inductively heatable susceptor. 
     
     
         14 . The induction heating assembly according to  claim 12 , wherein the channel is formed by a pair of side walls extending in the longitudinal direction, the side walls comprising an electrically conductive and magnetically permeable material. 
     
     
         15 . The induction heating assembly according to  claim 12 , wherein the channel is covered by an electrically conductive and non-magnetically permeable material strip to enclose the temperature sensor in the channel.