Patent Publication Number: US-2023136231-A1

Title: Atomizing unit and atomizing device

Description:
FIELD 
     The present invention relates to the technical field of electronic heating atomization, and more specifically, to an atomizing unit and an atomizing device. 
     BACKGROUND 
     The heating atomization can disperse liquid into smaller particles, making the liquid molecules more dispersed in space, and is widely used in the fields of medical, agricultural, household appliances, electronic consumer goods and the like. The heating atomization is easy to implement, and can atomize most liquids into particles, thus has been widely used in recent years. The innovation of the heating member, as a core component of the heating atomization, is particularly important. 
     At present, the most widely used heating members in the field of the heating atomization are the cylindrical heating members, which are mainly divided into two types: one is the cylindrical heating member formed by spiraling a heating wire, and the other is the tubular heating member by wounding a grid shaped heating sheet into a C-shape. The two electrodes of the two types of the heating members are respectively arranged at two opposite ends of the heating member, which brings the following problems:  1 , the electrodes at the two ends need to be led out to a same end through electrode leads, during design, the leads occupy space, and the liquid conducting material outside the heating member needs to evade the position of the leads when wrapping and matching, which makes it difficult to be assembled;  2 , the C-shaped tubular heating member is not a whole circular in the circumferential direction and has insufficient radial support, which is easy to be deformed and thus causes a poor contact with the liquid conducting material. 
     In addition, the heating value of the current cylindrical heating member is not easy to be adjusted, and is easy to be changed in size during production and assembly, which affects the consistency of the product. 
     SUMMARY 
     A technical problem to be solved by the present invention is, to provide an improved atomizing unit and an atomizing device that are easy to be assembled and have high structural strength. 
     A technical solution adopted by the present invention to solve the technical problem is to provide an atomizing unit, including a tubular heating assembly and a liquid conducting member; wherein the liquid conducting member is wrapped around an outer periphery of the tubular heating assembly or fitted to an inner peripheral surface of the tubular heating assembly; 
     the tubular heating assembly includes an annular connecting portion, at least two heating portions connected to one end surface of the connecting portion and arranged around the end surface, and electrode portions connected to one end of the heating portions away from the connecting portion; and 
     each side of two opposite sides of one heating portion faces to a corresponding side of its adjacent heating portion with a gap therebetween; and the at least two heating portions are connected in series through the connecting portion. 
     Preferably, each heating portion is provided with a hollow structure, and the hollow structure includes a plurality of through slots and/or a plurality of notches spaced along a length direction of the heating portion, to enables the heating portion to form at least one heating trace. 
     Preferably, the heating trace is in a circuitous bent shape, a polyline shape or a wave shape. 
     Preferably, in the length direction of the heating portion, the widths of the through slot and/or the notch located in the middle of the heating trace are larger than the widths of the through slot and/or the notch located at two ends of the heating trace. 
     Preferably, the heating trace is provided with a plurality of spaced through hole. 
     Preferably, the electrode portions are provided with at least one hollow portion. 
     Preferably, the tubular heating assembly further includes electrode leads connected to the electrode portions. 
     Preferably, the liquid conducting member includes a liquid conducting tubular body, and an annular step projecting on an outer periphery of one end of the liquid conducting tubular body; and the liquid conducting tubular body extends in the tubular heating assembly, and the electrode portions of the tubular heating assembly are abutted against the annular step or partially embedded in the annular step. 
     Preferably, the atomizing unit further includes a supporting assembly supporting the tubular heating assembly; and 
     the supporting assembly includes a supporting base and a supporting member, the supporting base is sleeved on the electrode portions of the tubular heating assembly, and the supporting member extends in the tubular heating assembly and is inserted on the supporting base; and the liquid conducting member is wrapped around the outer periphery of the tubular heating assembly and abutted on the supporting base. 
     Preferably, the supporting base includes a base body, the base body is provided with a central through hole running through two opposite surfaces thereof, and at least two perforations spaced and surrounding an outer periphery of the central through hole; and one end of the supporting member is inserted in the central through hole, and each electrode portion is inserted in the corresponding perforation. 
     Preferably, the supporting member includes a barrel body with an open end and a closed end opposite to the open end; the open end of the barrel body is inserted in the central through hole of the supporting base and is located in the electrode portions of the tubular heating assembly; the closed end of the barrel body is in the tubular heating assembly and faces the heating portions, and is located in the junction of the electrode portion and the heating portion or in an end of the heating portion; and 
     a side wall of the closed end of the barrel body is provided with at least one vent hole configured to communicate an atomization passage of the tubular heating assembly with an internal passage of the barrel body. 
     Preferably, the atomizing unit further includes a sleeve sleeved around the liquid conducting member and the supporting base; and a side wall of the sleeve is provided with at least one liquid conducting hole that runs through an inner wall surface and an outer wall surface thereof. 
     The present invention further provides an atomizing device, including the atomizing unit of any one of the above, a shell that is hollow, and a base; wherein, 
     one end of the shell is provided with an air outlet, and another opposite end of the shell is opened to form an open end; and the base is fitted to the open end of the shell, and the atomizing unit is disposed in the shell and inserted on the base; and 
     the shell is provided therein with an air duct communicated between the air outlet and the atomizing unit, and a liquid storage chamber located on an outer periphery of the air duct and in fluid communication with the liquid conducting member of the atomizing unit. 
     Preferably, the base includes a foundation base that is hard and a sealing base matched with the foundation base; and 
     the foundation base is provided with an installation slot that is inward concave, and an air inlet penetrating a bottom surface of the installation slot; the atomizing unit is inserted in the installation slot; the sealing base is sleeved on the foundation base, and a side surface of the sealing base located in the installation slot is provided with at least one protruding first sealing rib, and a side surface of the sealing base located at an outer circumference of the foundation base is provided with at least one protruding second sealing rib. 
     Preferably, the atomizing device further includes a sealing seat; and 
     an end of the air duct facing the atomizing unit is inserted on an end of the atomizing unit facing the air outlet, and the sealing seat is fitted to the end of the atomizing unit facing the air outlet, and seals a matching gap between the atomizing unit and the air duct. 
     Preferably, the atomizing device further includes a bottom case, and the bottom case is sleeved outside the base and connected with the shell, to form an integral housing together with the shell. 
     Preferably, the atomizing device further includes two electrodes inserted on the base; and the electrodes are electrically connected with the electrode portions of the atomizing unit. 
     The atomizing unit of the present invention adopts the tubular heating assembly as a heating element and is tubular in overall shape, and at least two relatively independent heating portions are connected into a whole and form a series connection through the connecting portion, which not only improves the structural strength of the heating assembly, but also has a larger resistance value compared with other heating elements of the same volume; the electrode portions are located at the same end of the heating assembly, which is convenient for assembly and connection with the battery or other power supply. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Subject matter of the present invention will be described in even greater detail below based on the exemplary figures. In the accompanying drawings: 
         FIG.  1    is a structural diagram of an atomizing unit in an embodiment of the present invention; 
         FIG.  2    is a sectional view of the atomizing unit in  FIG.  1    cooperated with an atomized liquid; 
         FIG.  3    is an exploded view of an atomizing unit in a second embodiment of the present invention; 
         FIG.  4    is a sectional view of the atomizing unit in  FIG.  3    cooperated with an atomized liquid; 
         FIG.  5    is a three-dimensional structural diagram of a tubular heating assembly in a first embodiment of the present invention; 
         FIG.  6    is a structural diagram of the tubular heating assembly in  FIG.  1    when unfolded; 
         FIG.  7    is a structural diagram of a tubular heating assembly when unfolded in a second embodiment of the present invention; 
         FIG.  8    is a structural diagram of a tubular heating assembly when unfolded in a third embodiment of the present invention; 
         FIG.  9    is a structural diagram of a tubular heating assembly when unfolded in a fourth embodiment of the present invention; 
         FIG.  10    is a structural diagram of a tubular heating assembly when unfolded in a fifth embodiment of the present invention; 
         FIG.  11    is a structural diagram of a tubular heating assembly when unfolded in a sixth embodiment of the present invention; 
         FIG.  12    is a structural diagram of a tubular heating assembly when unfolded in a seventh embodiment of the present invention; 
         FIG.  13    is a structural diagram of a tubular heating assembly when unfolded in an eighth embodiment of the present invention; 
         FIG.  14    is a three-dimensional structural diagram of a tubular heating assembly in a ninth embodiment of the present invention; 
         FIG.  15    is a sectional view of an atomizing unit in a third embodiment of the present invention; 
         FIG.  16    is an exploded view of the atomizing unit in the third embodiment of the present invention; 
         FIG.  17    is a sectional view of an atomizing device in an embodiment of the present invention; 
         FIG.  18    is an exploded view of the atomizing device shown in  FIG.  17   ; and 
         FIG.  19    is an exploded view of the base in  FIG.  18   . 
     
    
    
     DETAILED DESCRIPTION 
     For better understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     As shown in  FIGS.  1  to  4   , an atomizing unit  2  of the present invention includes a tubular heating assembly  100  and a liquid conducting member  200 . The liquid conducting member  200  may surround an outer circumference of the tubular heating assembly  100  or disposed on an inner circumference surface of the tubular heating assembly  100  to conduct the adsorbed atomized liquid to the tubular heating assembly  100  for heating to generate smoke. 
     As shown in  FIGS.  1  and  2   , in the atomizing unit  2  in a first embodiment of the present invention, the liquid conducting member  200  is wrapped around the outer periphery of the tubular heating assembly  100 . The atomized liquid  300  is adsorbed from the outer periphery of the liquid conducting member  200 , and then conducted to the tubular heating assembly  100 , to be heated and atomized to generate smoke. Since the tubular heating assembly  100  is tubular as a whole, its inner passage forms an atomization passage, and the smoke generated by heating and atomizing is output along the atomization passage, as shown by the arrows in  FIG.  2   . 
     As shown in  FIGS.  3  and  4   , in the atomizing unit  2  in a second embodiment of the present invention, the liquid conducting member  200  is matched on the inner peripheral surface of the tubular heating assembly  100 . The inner periphery of the liquid conducting member  200  may be used as a liquid storage chamber to store the atomized liquid  300 . A gap for air to flow is left between the outer periphery of the tubular heating assembly  100  and a fixing member configured for installation and fixation. The atomized liquid  300  is adsorbed from the inner periphery of the liquid conducting member  200 , and then conducted to the tubular heating assembly  100  to be heated and atomized to generate smoke, which is output along the outer peripheral surface of the tubular heating assembly  100 , as shown by the arrows in  FIG.  4   . 
     In the atomizing unit  2  of the present invention, the cross-sectional shape of the tubular heating assembly  100  may be a circle or a polygon or other shape. 
     Referring to  FIGS.  4  and  5   , the tubular heating assembly  100  includes an annular connecting portion  10 , at least two heating portions  20  connected to one end surface of the connecting portion  10  and arranged around the end surface, electrode portions  30  each connected to the end of the heating portion  20  away from the connecting portion  10 , and electrode leads  40  each connected to the electrode portion  30 . In the whole axial direction of the tubular heating assembly  100 , the connecting portion  10  and the electrode portion  30  are respectively located on two opposite ends of the tubular heating assembly  100 , and the heating portion  20  is located in the middle and connected between the connecting portion  10  and the electrode portion  30 . 
     The connecting portion  10  has two opposite annular end surfaces, the heating portion  20  is connected with one end surface of the connecting portion  10 , and is arranged around the end surface. The at least two heating portions  20  are spaced (not connected). The electrode portions  30  are respectively connected to the end of the heating portions  20  away from the connecting portion  10 , and the electrode portions  30  are also spaced and respectively correspond to positive and negative electrodes. Each electrode portion  30  is connected with an electrode lead  40 , for connecting to the positive electrode and or the negative electrode of a battery or other power supply. 
     Each heating portion  20  has two opposite sides, and each side faces to the corresponding side of its adjacent heating portion  20  with a gap  50  therebetween. The at least two heating portions  20  are connected in series through the connecting portion  10 , so as to be connected to the external power supply in series, and the resistance value can be higher than that of other heating members of the same volume. 
     In the whole tubular heating assembly  100 , the connecting portion  10  connects the at least two relatively independent heating portions  20  to be a whole structure, to improve the strength of the tubular structure of the heating assembly. The at least two electrode portions  30  are located at the same end of the heating assembly, which is convenient for the assembly in the atomizing device and the connection with the battery. 
     The heating portion  20  is provided with a hollow structure, which enables the heating portion  20  to form a heating structure such as a heating trace  21 , the heating trajectory is long and the heating area is reduced, and the resistance is larger compared with the connecting portion  10  and the electrode portion  30 , so that more heat is generated when powered on. In addition, the heating value of the heating trace  21  may be adjusted by adjusting its width, spacing, etc. 
     Further, the hollow structure may include a plurality of through slots  201  and/or a plurality of notches  202  spaced disposed along the length direction of the heating portion  20 . The arrangement of the hollow structure enables the heating portion  20  to form at least one heating trace  21 . 
     In the tubular heating assembly  100  in the first embodiment, as shown in  FIGS.  5  and  6   , the tubular heating assembly  100  includes two symmetrically disposed heating portions  20 . One end of each heating portion  20  away from the connecting portion  10  is connected with an electrode portion  30 . The hollow structure on each heating portion  20  includes a plurality of through slots  201  and a plurality of notches  202 . Wherein, the plurality of through slots  201  are spaced along the length direction of the heating portion  20 . Two notches  202  are arranged between each two adjacent through slots  201 , and the two notches  202  are spaced and opposite. The arrangement of the through slots  201  and the notches  202  makes the heating portion  20  include a plurality of heating rings that are sequentially connected in the length direction of the heating portion  20 , and the partition  203  between the opposite two notches  202  forms a connecting structure for connecting the heating rings. 
     Dividing the heating portion  20  according to its central line, the heating portion  20  may be divided into two heating traces  21  with the central line as the symmetry axis, that is, the two heating traces  21  are connected and symmetrical. The two heating traces  21  are connected in parallel. Each heating trace  21  may be in a circuitous bent shape as shown in  FIG.  6   , or in other shape such as a polyline shape or a glass shape. 
     In consideration of the overall strength of the heating assembly, the width L1 of the partition  203  (between the two opposite notches  202 ) located on the central line of the heating portion  20  is preferably greater than or equal to two times the width L2 of the notch  202 . 
     In the tubular heating assembly  100 , the wall thickness of the heating portion is 0.03 mm to 0.5 mm. Alternatively, the tubular portion of the tubular heating assembly  100  (including the connecting portion  10 , the heating portions  20  and the electrode portions  30 ) is an integrated structure, with an overall wall thickness of 0.03 mm to 0.5 mm. 
     The tubular heating assembly  100  may be made of stainless steel alloy, nickel chromium alloy, iron chromium aluminum alloy, titanium and titanium alloy, nickel base alloy, hastelloy alloy or other metal material, by cutting (specific wire cutting, laser cutting, spark cutting, etc.) or other processing method. 
     As an option, the tubular portion of the tubular heating assembly  100  (including the connecting portion  10 , the heating portions  20  and the electrode portions  30 ) may use a tubular body as a substrate, to form the connecting portion  10 , the heating portions  20  and the electrode portions  30  on it by cutting or other processing method, and to form the heating trace  21  by processing the hollow structure on the heating portion  20 . Alternatively, the tubular portion of the tubular heating assembly  100  (including the connecting portion  10 , the heating portions  20  and the electrode portions  30 ) may use a metal sheet as the substrate, to form a flat connecting portion  10 , flat heating portions  20  and flat electrode portions  30  on it by cutting or other processing method, and to form the heating trace  21  by processing the hollow structure on the heating portion  20 , then curve the processed metal sheet into a tube, and weld the two ends of the connecting portion  10  together. 
     In addition, according to the required diameter, the overall diameter of the heating assembly may be adjusted by increasing or decreasing the number of the heating portions  20  and the width of the heating portion  20  of the tubular heating assembly  100 . 
     In the tubular heating assembly  100  in the second embodiment, as shown in  FIG.  7   , the hollow structure on the heating portion  20  includes a plurality of notches  202  spaced and interlaced along the length direction of the heating portion  20 . The arrangement of the plurality of notches  202  makes heating portion  20  form one heating trace  21 . 
     The heating portion  20  provided with one heating trace  21 , compared with the heating portion  20  which is provided with two or more heating traces  21 , is beneficial to reduce the width and form a heating assembly with a smaller diameter. 
     As shown in  FIG.  8   , the tubular heating assembly  100  in the third embodiment differs from the first embodiment in that: the arrangement of the hollow structure on each heating portion  20  makes the heating portion  20  form two heating areas that are connected and symmetrical to each other, and each heating area includes two heating traces  21  that are connected and symmetrical. Therefore, each heating portion  20  has four heating traces  21 , which are sequentially connected in the width direction of the heating portion  20 . The heating portion  20  in this embodiment, compared with the tubular heating assembly  100  in the first and second embodiments, is applicable to the tubular heating assembly with a larger diameter requirement. 
     Understandably, for the tubular heating assembly  100  with the same diameter requirement, the heating portion  20  can also form one or more heating traces  21  according to the requirements for heating value, atomization effect, etc. 
     With reference to  FIGS.  5 - 8   , in the tubular heating assembly  100  of any one of the first to third embodiments, the widths of the through slots  201  and the notches  202  are uniformly arranged, that is, on the heating portion  20 , the widths of the plurality of through slots  201  are equal, the widths of the plurality of notches  202  are equal, and the widths of the through slot  201  and the notch  202  may also be equal. 
     The heating assembly  100  in the fourth embodiment, as shown in  FIG.  9   , differs from the first to third embodiments in that: in the length direction of the heating portion  20 , the widths of the through slot  201  and/or the notch  202  in the middle of the heating trace  21  are larger than the widths of the through slot  201  and/or the notch  202  at the two ends of the heating trace  21 . 
     According to the thermal radiation principle, the temperature in the middle of the heating portion  20  is higher than the temperature at the two ends of the heating portion  20 . Therefore, by arranging the widths of the through slot  201  and/or the notch  202  in the middle of the heating trace  21  larger than the widths of the through slot  201  and/or the notch  202  at the two ends of the heating trace  21 , so that the spacing in the middle of the heating trace  21  is larger and the spacing in the two ends of the heating trace  21  is smaller, thereby the overall heating capacity of the heating portion  20  is more uniform. 
     In the fifth embodiment of the tubular heating assembly  100 , as shown in  FIG.  10   , the tubular heating assembly  100  includes an annular connecting portion  10 , at least two heating portions  20 , at least two electrode portions  30 , and electrode leads  40  connected to the electrode portions  30 . 
     In the axial direction of the whole heating assembly, the connecting portion  10  and the electrode portion  30  are respectively located on the two opposite ends thereof, and the heating portion  20  is located in the middle and connected between the connecting portion  10  and the electrode portion  30 . The connecting portion  10  has two opposite annular end surfaces, the heating portion  20  is connected with one end surface of the connecting portion  10 , and is arranged around the end surface. The at least two heating portions  20  are spaced (not connected). The electrode portion  30  is connected to the end of the heating portion  20  away from the connecting portion  10 . The electrode portions  30  are also spaced and respectively correspond to the positive and negative electrodes. Each electrode portion  30  is connected with an electrode lead  40  for connecting the positive or negative electrode of the battery or other power supply. The at least two heating portions  20  are connected in series through the connecting portion  10 , so as to connect the external power supply in series, and the resistance value can be higher than that of other heating elements of the same volume. 
     The heating portion  20  is provided with a hollow structure, so that a heating structure such as a heating trace  21  is formed on the heating portion  20 , the heating trajectory is long and the heating area is reduced, and the resistance is larger compared with the connecting portion  10  and the electrode portion  30 , so that more heat is generated when powered on. In addition, the heating value of the heating trace  21  can be adjusted by adjusting its width, spacing, etc. 
     By arranging the hollow structure, one or more heating traces  21  may be formed on each heating portion  21 , which may refer to the first to third embodiments above for details. The widths of the through slots and/or the notches on the heating portion  21  may be uniform or non-uniform, which may refer to the first to third embodiments, or the fourth embodiment for details, and will not be repeated here. 
     Different from the first to fourth embodiments above, in this embodiment, the heating trace  21  is provided with a plurality of spaced through holes  204 . The arrangement of the through holes  204  increases the surface area of the heating trace  21 , so that the heating trace  21  has a higher thermal efficiency and a faster heat dissipation. 
     As shown in  FIG.  11   , in the sixth embodiment of the tubular heating assembly  100 , the tubular heating assembly  100  includes an annular connecting portion  10 , at least two heating portions  20 , at least two electrode portions  30 , and electrode leads  40  connected to the electrode portions  30 . 
     In the axial direction of the whole heating assembly, the connecting portion  10  and the electrode portion  30  are respectively located on the two opposite ends thereof, and the heating portion  20  is located in the middle and connected between the connecting portion  10  and the electrode portion  30 . The connecting portion  10  has two opposite annular end surfaces, the heating portion  20  is connected with one end surface of the connecting portion  10 , and is arranged around the end surface. The at least two heating portions  20  are spaced (not connected). The electrode portion  30  is connected to the end of the heating portion  20  away from the connecting portion  10 . The electrode portions  30  are also spaced and respectively correspond to the positive and negative electrodes. Each electrode portion  30  is connected with an electrode lead  40  for connecting the positive or negative electrode of the battery or other power supply. The at least two heating portions  20  are connected in series through the connecting portion  10 , so as to connect the external power supply in series, and the resistance value can be higher than that of other heating elements of the same volume. 
     The heating portion  20  is provided with a hollow structure, so that a heating structure such as a heating trace  21  is formed on the heating portion  20 , the heating trajectory is long and the heating area is reduced, and the resistance is larger compared with the connecting portion  10  and the electrode portion  30 , so that more heat is generated when powered on. In addition, the heating value of the heating trace  21  can be adjusted by adjusting its width, spacing, etc. 
     The specific arrangements of the hollow structure and the heating trace  21 , etc., on the heating portion  20 , may refer to the first to fourth embodiments above, and will not be repeated here. 
     In this embodiment, the electrode portion  30  is provided with at least one hollow portion  301 . The hollow portion  301  may be a through-hole structure in the shape of polygon, circle, ellipse, or the like. The hollow portion  301  is preferably arranged on the end of the electrode portion  30  adjacent to the heating portion  20 . 
     Considering that the heat of the heating portion  20  will be transmitted to the electrode portion  30 , resulting in a high temperature at the installation position of the electrode portion  30 , therefore, the hollow portion  301  is arranged on the electrode portion  30  to reduce its thermal conductivity area, which can play a good role in heat insulation, so that the temperature difference in the electrode portion  30  is smaller compared to the heating portion  20 . 
     As shown in  FIG.  12   , in the seventh embodiment of the tubular heating assembly  100 , the tubular heating assembly  100  includes an annular connecting portion  10 , at least two heating portions  20  connected to one end surface of the connecting portion  10  and arranged around the end surface, and electrode portions  30  connected to one end of the heating portions  20  away from the connecting portion  10 . 
     Each side of the two opposite sides of the heating portion  20  faces to the corresponding side of its adjacent other heating portion  20  with has a therebetween. The at least two heating portion  20  are connected in series through connecting portion  10 . Each heating portion  20  is connected with an electrode portion  30 , so the electrode portions  30  are spaced and respectively correspond to the positive and negative electrodes. Each electrode portion  30  is connected with an electrode lead  40 , which is used to connect the positive or negative electrode of a power supply such as a battery. 
     The heating portion  20  is provided with a hollow structure, so that a heating structure such as a heating trace  21  is formed on the heating portion  20 , the heating trajectory is long and the heating area is reduced, and the resistance is larger compared with the connecting portion  10  and the electrode portion  30 , so that more heat is generated when powered on. In addition, the heating value of the heating trace  21  may be adjusted by adjusting its width, spacing, etc. 
     In this embodiment, the hollow structure includes a plurality of through slots  201  and a plurality of notches  202  spaced along the length direction of the heating portion  20 , so that the heating portion  20  forms two connected and symmetrical heating traces  21 . Further, by arranging the through slot  201  to be diamond and the notch  202  to be triangle, so that each heating trace  21  is in a polyline or wave shape, and the whole heating portion  20  is in a grid shape. 
     As shown in  FIG.  13   , in the eighth embodiment of the tubular heating assembly  100 , what is different from the seventh embodiment is that the hollow structure includes a plurality of through slots  201  and a plurality of notches  202  spaced along the length direction of the heating portion  20 , so that the heating portion  20  forms three heating traces  21 , wherein two heating traces  21  are spaced and symmetrical, and the other heating trace  21  is connected between the two heating traces  21 . Wherein, by arranging the through slot  201  to be diamond and the notch  202  to be triangle, so that each heating trace  21  is in a broken line or wave shape, and the whole heating portion  20  is in a grid shape. 
     In the seventh and eighth embodiments, the spacing and the through holes of the heating trace  21 , and the hollow portion on the electrode portion  30 , etc., may be arranged as required, and may refer to the relevant arrangements of the first to sixth embodiments for details. 
     In the tubular heating assembly  100  of the first to eighth embodiments above, the electrode lead  40  is in a strip shape to form an electrode lead wire. 
     As shown in  FIG.  14   , in the ninth embodiment of the tubular heating assembly  100 , the tubular heating assembly  100  includes an annular connecting portion  10 , at least two heating portions  20 , at least two electrode portions  30 , and electrode leads  40  connected to the electrode portions  30 . 
     In the axial direction of the whole heating assembly, the connecting portion  10  and the electrode portion  30  are respectively located on the two opposite ends thereof, and the heating portion  20  is located in the middle and connected between the connecting portion  10  and the electrode portion  30 . The connecting portion  10  has two opposite annular end surfaces, the heating portion  20  is connected with one end surface of the connecting portion  10 , and is arranged around the end surface. The at least two heating portions  20  are spaced (not connected). The electrode portion  30  is connected to the end of the heating portion  20  away from the connecting portion  10 . The electrode portions  30  are also spaced and respectively correspond to the positive and negative electrodes. Each electrode portion  30  is connected with an electrode lead  40  for connecting to the positive or negative electrode of the battery or other power supply. The at least two heating portions  20  are connected in series through connecting portion  10 , so as to connect the external power supply in series, and the resistance value can be higher than that of other heating elements of the same volume. 
     The heating portion  20  is provided with a hollow structure, so that a heating structure such as a heating trace  21  is formed on the heating portion  20 , the heating trajectory is long and the heating area is reduced, and the resistance is larger compared with the connecting portion  10  and the electrode portion  30 , so that more heat is generated when powered on. In addition, the heating value of the heating trace  21  may be adjusted by adjusting its width, spacing, etc. 
     As required, in this embodiment, at least one hollow portion  301  may be disposed on the electrode portion  30 . By arranging the hollow portion  301  on the electrode portion  30 , the thermal conductive area of the electrode portion  30  is reduced, and a good heat insulation is achieved, making the temperature difference in the electrode portion  30  smaller compared to the heating portion  20 . The hollow portion  301  may be a through-hole structure in the shape of polygon, circle, ellipse, or the like. The hollow portion  301  is preferably arranged on the end of the electrode portion  30  adjacent to the heating portion  20 . 
     Different from the first to the eighth embodiments, in this embodiment, the electrode lead  40  is an electrode sheet extending outward from the end of the electrode portion  30  away from the heating portion  20 . The electrode sheet may be further bent relative to the electrode portion  30  to increase the connecting area with the battery or other power supply, and may further form a support foot to play the role of fixing and supporting. 
     As shown in  FIGS.  1  and  2   , in the atomizing unit  2  of the first embodiment of the present invention, the tubular heating assembly  100  may be the tubular heating assembly  100  of any one of the first to the ninth embodiments above, and liquid conducting member  200  is wrapped around the outer periphery of the connecting portion  10 , the heating portions  20  and the electrode portions  30  of the tubular heating assembly  100 . The electrode leads  40  of the tubular heating assembly  100  extend out of the liquid conducting member  200  to be connected to the positive and negative poles of the power supply respectively. 
     Similarly, in the atomizing unit  2  of the second embodiment of the present invention, the tubular heating assembly  100  may be the tubular heating assembly  100  of any one of the first to the ninth embodiments above. As shown in  FIGS.  3  and  5   , further, in the atomizing unit  2  of this embodiment, the liquid conducting member  200  includes a liquid conducting tubular body  210  and an annular step  220  projecting on the outer periphery of one end of the liquid conducting tubular body  210 . The liquid conducting tubular body  210  extends in the tubular heating assembly  100 , and the electrode portion  30  of the tubular heating assembly  100  is abutted against the annular step  220  or partially embedded in the annular step  220 . The liquid conducting tubular body  210  in the tubular heating assembly  100  may be abutted against the inner peripheral surface of the tubular heating assembly  100 , or the outer peripheral surface of the liquid conducting tubular body  210  may be embedded on the inner peripheral surface of the tubular heating assembly  100 . 
     In the atomizing unit  2  of the present invention, the liquid conducting member  200  may be a flexible porous liquid conducting member, such as a liquid conducting cotton. The liquid conducting member  200  may alternatively be a rigid porous liquid conducting member, such as a porous ceramic liquid conducting member. 
     When the liquid conducting member  200  is a flexible porous liquid conducting member, in order to avoid the bending deformation of the liquid conducting member  200  when the liquid conducting member  200  is wrapped around the tubular heating assembly  100 , a supporting assembly may be provided to support and position the tubular heating assembly  100 . 
     As shown in  FIGS.  15  and  16   , the atomizing unit  2  in the third embodiment of the present invention further includes a supporting assembly  400  configured for supporting the tubular heating assembly  100 , compared with the atomizing unit  2  of the first embodiment and the second embodiment. 
     The supporting assembly  400  includes a supporting base  410  and a supporting member  420 , the supporting base  410  is sleeved on the electrode portion  30  of the tubular heating assembly  100 , and the supporting member  420  extends into the tubular heating assembly  100  and is inserted in the supporting base  410 . The liquid conducting member  200  is wrapped around the outer periphery of the tubular heating assembly  100  and abutted on the supporting base  410 . 
     The supporting base  410  may include a base body  411 , and the base body  411  is provided with a central through hole  412  that runs through its two opposite surfaces, and at least two perforations  413  that are spaced and surround the outer periphery of the central through hole  412 . One end of the supporting member  420  is inserted into the central through hole  412 , each electrode portion  41  of the tubular heating assembly  100  is inserted into a corresponding hole  413 , and the electrode lead  40  of the tubular heating assembly  100  passes through the perforation  413  to expose out of the lower end of the base body  411 . The perforation  413  may be a structure with wide upper end and narrow lower end, for example, a structure with widths gradually decreased from one end to another opposite end, which can guide the electrode portion  41  penetrating through the perforation  413 . 
     The supporting base  410  is preferably made of silica gel, which can be compressed to achieve close fit sealing and insulation. The supporting member  420  is preferably made of insulating hard material, such as ceramics, plastics, or the like. 
     The main body of the supporting member  420  is columnar, positioned on the supporting base  410  and arranged in the tubular heating assembly  100 , to avoid the problem of deformation caused by the gap between the heating portions  30  in the tubular heating assembly  100 . The height of the supporting member  420  in the tubular heating assembly  100  may be at the junction of the electrode portion  30  and the heating portion  20 , or to the end of the heating portion  20 , whichever does not affect the heating effect of the heating portion  20 . 
     In addition, in order to ensure airflow circulation, the side wall of the supporting member  420  may be hollowed or reticulated, or a through hole may be arranged on the side wall. 
     In this embodiment, as shown in  FIGS.  15  and  16   , the supporting member  420  includes a barrel body  421  with one end open and the other opposite end closed, and may further include a barrel seat  423  connected to the outer periphery of the open end of the barrel body  421 . The open end of the barrel body  421  is inserted in the central through hole  412  of the supporting base  410  and located at the inner side of the electrode portion  30  of the tubular heating assembly  100 . The barrel seat  423  is fitted to the bottom surface of the supporting base  410  to prevent the barrel body  421  from falling out of the supporting base  410 . The closed end of the barrel body  421  is in the tubular heating assembly  100  and faces the heating portion  20 , and is located in the junction of the electrode portion  30  and the heating portion  20  or in the end of the heating portion  20 . 
     The side wall of the closed end of the barrel body  421  is provided with at least one vent hole  422  to communicate the atomization passage of the tubular heating assembly  100  with the internal passage of the barrel body  421 , and the atomization passage of the tubular heating assembly  100  is communicated with the external air through the open end of the barrel body  421  to ensure the airflow circulation. The arrangement of the vent hole  422  on the side wall of the closed end of the barrel body  421  improves the gas inlet into the tubular heating assembly  100 , effectively preventing the condensed liquid formed by the condensation of the atomized steam during the atomization of the atomizing unit  2  from leaking out of the vent hole  422 . During the atomization process, the condensed liquid formed by the condensation of the atomized steam can be accumulated in the annular space between the supporting base  410 , the barrel body  421  and the electrode portion  30 , and then adsorbed by the liquid conducting member  200  through the hollow portion  301  arranged on the electrode portion  30  to be reused. 
     In addition, the arrangement of the vent hole  422  on the side wall of the closed end of the barrel body  421  can also cause the incoming airflow to change direction and blow to the inner surface of the heating portion  20 , which can take away the high-temperature atomized steam, and meanwhile, the temperature of the incoming air is lower, so that the heating portion  20  can dissipate heat more quickly and the problem of heat accumulation during continuous operation is avoided. Further, the atomizing unit  2  in this embodiment further includes a sleeve  500  sleeved around the liquid conducting member  200  and the supporting member  420 . The side wall of the sleeve  500  is provided with at least one liquid conducting hole  510  that runs through the inner and outer wall surfaces of the sleeve  500 . The liquid conducting hole  510  communicates the liquid conducting member  200  with the liquid storage chamber disposed externally to realize liquid transmission. 
     At least one convex sealing ring  414  may be arranged on the outer periphery of the supporting base  420 , which is closely matched with the inner wall surface of the sleeve  500  to play a sealing role. 
     As shown in  FIGS.  17  and  18   , an atomizing device in an embodiment of the present invention includes a hollow shell  1 , an atomizing unit  2  arranged in the shell  1 , and a base  3  matched with the shell  1 . 
     The shell  1  may be a hollow shell in the shape of a cylinder or a flat. One end of the shell  1  is provided with an air outlet  110 , and the opposite end is opened to form an open end. The shell  1  is provided with an air duct  120  therein, and the air duct  120  extends along the length direction (or axial direction) of the shell  1 , one end of the air duct  120  is communicated with the air outlet  110 , and the opposite end of the air duct  120  is spaced toward the open end. The internal passage of the air duct  120  forms an air guide passage, which is communicated with the air outlet  110 . The air duct  120  may be integrally formed in the shell  1 , or may be separately manufactured and assembled therein. A liquid storage chamber  130  located at the outer periphery of the air duct  120  is provided in the shell  1 , which is used to store the atomized liquid to be heated and atomized. 
     The base  3  is fitted to the open end of the shell  1  to seal the open end. The atomizing unit  2  is arranged in the shell  1  and inserted in the base  3 , and is connected to the air duct  120 , so that the atomizing unit  2  is positioned between the air duct  120  and the base  3 . The air duct  120  is communicated with the atomizing unit  1 , and the base  3  is provided with an air inlet  310  communicated with the atomizing unit  1 . Specifically, the passage defined by the inner periphery of the atomizing unit  1  forms the atomization passage, which is respectively communicated with the inner passage of the air duct  120  and the air inlet  310 . The liquid storage chamber  130  located on the outer periphery of the air duct  120  is in fluid communication with the liquid conducting member  200  of the atomizing unit  2 , so that the atomized liquid stored in the liquid storage chamber  130  is adsorbed by the liquid conducting member  200  and conducted to the tubular heating assembly  100  of the atomizing unit  2 , to be heated and atomized to generate smoke, which is then output through the atomization passage and the air outlet  110 , where the output direction is shown by the arrows in  FIG.  17   . 
     The base  3  is arranged corresponding to the open end of the shell  1 . As shown in  FIGS.  18  and  19   , in this embodiment, the base  3  includes a hard foundation base  320  and a sealing base  330  matched with the foundation base  320 . The foundation base  320  may be assembled to the open end of the shell  1  by means of interference fit, etc. The sealing base  330  is sleeved on the foundation base  320  to play a sealing role through its own flexibility and compressibility. 
     The foundation base  320  is provided with an installation slot  321  that is inward concave, and the atomizing unit  2  is inserted into the installation slot  321 . The air inlet  310  is arranged on the bottom surface of the installation slot  321  and penetrates through the bottom surface. 
     The sealing base  330  is sleeved on the foundation base  320 , with a structural shape corresponding to the upper portion of the foundation base  320 , for example, with one side extending along the inner peripheral surface of the installation slot  321  of the foundation base  320 , and another side extending along the outer peripheral surface of the foundation base  320 . The side surface of the sealing base  330  located in the installation slot  321  is provided with at least one protruding first sealing rib  331 , which is configured to be closely fitted with the outer surface of the atomizing unit  2  to achieve the sealing effect. The sealing base  330  is provided with at least one protruding second sealing rib  332  at the side of the outer circumference of the foundation base  320 , which is used for tight matching with the inner wall surface of the shell  1  to achieve the sealing effect. 
     The atomizing unit  2  may be the atomizing unit  2  in the first embodiment shown in  FIGS.  1  and  2    or the second embodiment shown in  FIGS.  3  and  4   , or may alternatively be the atomizing unit  2  in the third embodiment shown in  FIGS.  15  and  16   . 
     Taking the atomizing unit  2  in the third embodiment as an example, in the shell  1 , one end of the air duct  120  toward the atomizing unit  2  is inserted on the sleeve  500  of the atomizing unit  2 , and the inner passage of the air duct  120  is communicated with the atomization passage defined by the inner periphery of the tubular heating assembly  100  through the sleeve  500 . The end of the atomizing unit  2  toward the base  3  is in a seal fit with the inner wall surface of the installation slot  321  and the first sealing rib  331  of the sealing base  330  through the outer peripheral surface of the sleeve  500 . 
     Further, the atomizing device of the present invention may further include a sealing seat  4 , which is fitted between the atomizing unit  2  and the air duct  120  to achieve gap sealing. Specifically, as shown in  FIGS.  17  and  18   , in this embodiment, the sealing seat  4  is fitted on the sleeve  500  of the atomizing unit  2  and seals the fitting gap between the atomizing unit  2  and the air duct  120 . 
     The sealing base  330  and the sealing seat  4  may be made of silica gel or other high-temperature resistant insulating material, respectively. 
     In order to improve the appearance integrity of the atomizing device, the atomizing device of the present invention may further include a bottom case  5 . The bottom case  5  is sleeved outside the base  3  and connected with the shell  1 , to form an integral housing with the shell  1 . The bottom case  5  may be made of the same material as the shell  1 , such as metal. 
     The atomizing device of the present invention further includes two electrodes  6  inserted on the base  3 . The electrodes  6  are electrically connected with the electrode portions  30  of the tubular heating assembly  100  in the atomizing unit  2 . 
     Specifically, the foundation base  320  of the base  3  is provided with insertion slots for the electrodes  6  to be inserted therein. When the atomizing unit  2  is inserted and positioned on the base  3 , the electrode lead  40  of the tubular heating assembly  100  passes through the bottom surface of the installation slot  321  of the foundation base  320  and then is exposed on the bottom surface of the foundation base  320  or is penetrated into the foundation base  320 , to be electrically connected with the electrode  6  inserted on the foundation base  320  to conduct the electrode portion  30  and the electrode  6 . 
     The electrode  6  and the electrode lead  40  may be connected and conducted through full contact with sufficient area, or may be further fixed together by welding. 
     When assembling the atomizing device of the present invention, the atomizing unit  2  may be assembled to the base  3  first, then the electrode lead  40  of the tubular heating assembly  100  is bent to the bottom surface of the base  3 , the electrode  6  is installed into the base  3  to be contacted with the electrode lead  40 , and then the sealing seat  4  is sleeved on the atomizing unit  2 . Then the assembled module is installed into the shell  1 , the base  2  is fitted at the open end of the shell  1 , and finally the bottom case  5  is sleeved outside the base  3  and connected to the end of the shell  1  to form a complete atomizing device, which is simple to assemble and convenient for automatic production. 
     While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. It will be understood that changes and modifications may be made by those of ordinary skill within the scope of the following claims. In particular, the present invention covers further embodiments with any combination of features from different embodiments described above and below. Additionally, statements made herein characterizing the invention refer to an embodiment of the invention and not necessarily all embodiments.