US20230094947A1 - Heating assembly, atomizing core and aerosol generating device - Google Patents

Heating assembly, atomizing core and aerosol generating device Download PDF

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Publication number
US20230094947A1
US20230094947A1 US18/075,390 US202218075390A US2023094947A1 US 20230094947 A1 US20230094947 A1 US 20230094947A1 US 202218075390 A US202218075390 A US 202218075390A US 2023094947 A1 US2023094947 A1 US 2023094947A1
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Prior art keywords
substrate
heating assembly
area
generating element
heat generating
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US18/075,390
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English (en)
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Weihua Qiu
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Changzhou Paiteng Electronic Technology Co Ltd
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Changzhou Paiteng Electronic Technology Co Ltd
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Assigned to CHANGZHOU PATENT ELECTRONIC TECHNOLOGY CO., LTD. reassignment CHANGZHOU PATENT ELECTRONIC TECHNOLOGY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: QIU, WEIHUA
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F47/00—Smokers' requisites not otherwise provided for
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/10—Devices using liquid inhalable precursors

Definitions

  • the present disclosure relates to the technical field of aerosol generating devices, in particular to a heating assembly, an atomizing core and an aerosol generating device.
  • the aerosol generating device is mainly composed of two parts: an atomizing assembly and a battery assembly.
  • the atomizing assembly generally includes an atomizing core and a liquid storage chamber.
  • the liquid storage chamber stores the e-liquid
  • the atomizing core absorbs the e-liquid from the liquid storage chamber for atomizing to form smoke.
  • the liquid guiding member and the heating assembly in the atomizing core are the core components of the atomizing technology, which play a decisive role in the taste of the aerosol generating device.
  • the heating assembly is configured for heating the e-liquid transported from the liquid guiding member to the heating assembly, so as to atomize the e-liquid to generate smoke.
  • the heat distribution in different areas of the heating assembly commonly used in the prior art cannot be regulated, and the heat loss is serious, thereby seriously reducing the atomizing efficiency.
  • the edge area of the heating assembly is provided with electrical contacts for connecting to an external power source; because the temperature of the edge area of the heating assembly in the prior art is also very high, the heating assembly in the prior art has to meet high requirements of heat resistance for the electrical contacts.
  • the present disclosure provides, in a first aspect, a heating assembly capable of limiting heat loss, improving atomizing efficiency and having low heat resistance requirements for the electrical contacts.
  • a heating assembly for being used in an aerosol generating device includes:
  • At least one heat generating element wherein the heat generating element is formed on the substrate
  • the electrical contacts are formed on the substrate, the electrical contacts are electrically connected to the heat generating element;
  • the heat insulation structure is formed on the substrate and located between the heat generating element and the electrical contacts.
  • the heat generating element is arranged at the center of the substrate, and the electrical contacts are arranged at the ends of the substrate.
  • the heat insulation structure is located on one side of the heat generating element, and the at least two electrical contacts are located at one end of the substrate away from the heat generating element.
  • the heat insulation structure is air cavity.
  • the air cavity penetrates through the substrate along a thickness direction of the substrate.
  • a group of air cavities are respectively formed on both sides of each heat generating element, and a side of each group of air cavities away from the heat generating element is formed with one of the electrical contacts.
  • the heating assembly is divided into a cold area, a hot area and a transition area, the heat generating element is arranged in the hot area, and the electrical contacts are arranged in the cold area, the heat insulation structure is arranged in the transition area.
  • the heating assembly is divided into a hot area, two cold areas and two transition areas along a length direction of the substrate, the hot area is located at the center of the substrate, the two cold areas are located at opposite ends of the substrate, the two transition areas are respectively located at two opposite sides of the hot area with each transition area being located between the hot area and a corresponding cold area; wherein the heat generating element is arranged in the hot area, the two electrical contacts are respectively arranged in the two cold areas, the heat insulation structure includes two groups of air cavities, and the two groups of air cavities are respectively arranged in the two transition areas.
  • the heating assembly is divided into a hot area, a cold area and a transition area along a length direction of the substrate, the hot area is located at the center of the substrate and extends to one end of the substrate, the cold area is located at the other end of the substrate, the transition area is located between the hot area and the cold area; wherein the heat generating element is arranged in the hot area, the two electrical contacts are arranged in the cold area, the heat insulation structure includes a group of air cavities, and the group of air cavities is arranged in the transition area.
  • the substrate includes a first main surface and a second main surface which are oppositely disposed, two directions perpendicular to each other are defined on the substrate parallel to the first main surface or the second main surface: a first direction and a second direction; the substrate includes two opposite first side edges in the first direction and two opposite second side edges in the second direction; in the first direction, each of the air cavities includes two opposite third side edges; in the second direction, each of the air cavities includes two opposite fourth side edges; the two third side edges are parallel to the two first side edges, the two fourth side edges are parallel to the two second side edges.
  • the distance between the second side edge and the fourth side edge of the air cavity adjacent to the second side edge is W 1
  • the distance between the two fourth side edges of each air cavity is W 2
  • the distance between two adjacent air cavities is W 3
  • m is the number of the air cavity, m is a positive integer and m ⁇ 1.
  • the distance between opposite side edges of the hot area is L 1
  • the distance between the two third side edges of each air cavity is L 2
  • the heating assembly further includes a plurality of release holes, the release hole penetrates through the substrate and is located in the hot area.
  • the present disclosure provides, in a second aspect, an atomizing core.
  • the atomizing core includes a liquid guiding member, and the atomizing core further includes the heating assembly according to the first aspect of the present disclosure.
  • an aerosol generating device which includes a battery assembly, an atomizing chamber, an airflow passage, and the atomizing core according to the second aspect of the present disclosure; wherein the airflow passage is communicated with the atomizing chamber; the airflow passage is configured to discharge an aerosol flowing out of the atomizing chamber to the outside for a user to inhale; the battery assembly is electrically connected to the heat generating element, the battery assembly is configured to provide the heat generating element with electrical energy required to atomize an aerosol-forming substrate.
  • the heating assembly includes a heat generating element, a heat insulation structure (air cavity) and electrical contacts, and the air cavity is arranged between the electrical contacts and the heat generating element. Because the air cavity is filled with air and the thermal conductivity of air is low, therefore, the air cavity can limit heat loss of the hot area and prevent the heat of the hot area from rapidly transferring to the cold area to cause the temperature of the cold area to be too high, thereby not only improving the atomizing efficiency of the atomizing core and the aerosol generating device, but also reducing the heat resistance requirements of the heating assembly, the atomizing core and the aerosol generating device for the electrical contacts.
  • FIG. 1 is a schematic cross-sectional view of an aerosol generating device provided by an embodiment of the present disclosure.
  • FIG. 2 is a plan view of a heating assembly shown in FIG. 1 .
  • FIG. 3 is a schematic diagram showing the resistances of different areas of a heating assembly.
  • FIG. 4 is a plan view of another heating assembly shown in FIG. 1 .
  • FIG. 5 shows the infrared (IR) characteristics of the heating assembly shown in FIG. 4 at 550° C.
  • FIG. 6 is a plan view of another heating assembly.
  • aerosol generating device 100 first side edge 3111 atomizing assembly 110 second side edge 3112 housing assembly 10 first main surface A 1 liquid storage chamber 13 second main surface A 2 liquid injection opening 131 heat insulation structure/air cavity 314 liquid outlet 132 third side edge 3141 atomizing chamber 14 fourth side edge 3142 smoke outlet 141 heat generating element 315 battery chamber 15 releasing hole 316 airflow passage 16 electrical contact 317 air outlet 161 liquid guiding member 32 atomizing core 30 absorbing surface 321 heating assembly 31, 31a, 31b, 31c atomizing surface 322 hot area 301 battery assembly 40 transition area 302 mouthpiece 50 cold area 303 heat insulating layer 60 substrate 311 liquid absorbing member 70
  • the first embodiment of the present disclosure provides an aerosol generating device 100 .
  • the aerosol generating device 100 includes a housing assembly 10 , an atomizing core 30 and a battery assembly 40 .
  • the atomizing core 30 and the battery assembly 40 are received in the housing assembly 10 , and the battery assembly 40 is electrically connected to the atomizing core 30 .
  • the housing assembly 10 includes a liquid storage chamber 13 , an atomizing chamber 14 , a battery chamber 15 , and an airflow passage 16 .
  • the aerosol generating device 100 further includes an atomizing assembly 110 .
  • the atomizing assembly 110 includes the liquid storage chamber 13 , the atomizing chamber 14 and the atomizing core 30 .
  • the aerosol generating device 100 may also include the battery chamber 15 , the airflow passage 16 , the atomizing assembly 110 and the battery assembly 40 .
  • the battery chamber 15 may also not be included in the housing assembly 10 , but is detachably installed with the housing assembly 10 . That is, the battery assembly 40 and the atomizing assembly 110 are detachably installed.
  • the atomizing assembly 110 may be provided separately from the liquid storage chamber 13 .
  • the atomizing assembly 110 is installed with the battery assembly 40 , and the liquid storage device with the liquid storage chamber 13 is provided separately.
  • the liquid storage chamber 13 is in communication with the atomizing chamber 14 , and the atomizing chamber 14 is in communication with the airflow passage 16 .
  • the liquid storage chamber 13 is configured for storing e-liquid.
  • the atomizing chamber 14 is configured for receiving the atomizing core 30 .
  • the battery chamber 15 is configured for receiving the battery assembly 40 .
  • the airflow passage 16 is configured to discharge the smoke flowing out of the atomizing chamber 14 to the outside for inhalation by the user.
  • a liquid injection opening 131 is formed on the outer wall of the liquid storage chamber 13 .
  • a liquid outlet 132 is formed on the inner wall of the liquid storage chamber 13 .
  • the liquid injection opening 131 is configured for injecting e-liquid into the liquid storage chamber 13 .
  • the liquid outlet 132 is in fluid communication with the atomizing core 30 .
  • the liquid storage chamber 13 is in communication with the atomizing chamber 14 through the liquid outlet 132 .
  • the e-liquid in the liquid storage chamber 13 enters the atomizing core 30 through the liquid outlet 132 , and the atomizing core 30 is configured to atomize the e-liquid to generate smoke.
  • a smoke outlet 141 is formed on the wall of the atomizing chamber 14 .
  • the atomizing chamber 14 is in communication with the airflow passage 16 through the smoke outlet 141 .
  • the smoke outlet 141 is configured to enable the smoke formed by the e-liquid entering the atomizing core 30 and being atomized by the atomizing core 30 to flow into the airflow passage 16 .
  • An air outlet 161 is provided on the wall of the airflow passage 16 .
  • the air outlet 161 is configured to enable the smoke to flow from the airflow passage 16 to the outside for the user to inhale.
  • the housing assembly 10 is also formed with an air inlet (not shown).
  • the external air enters from the air inlet, the smoke obtained through atomization by the atomizing core passes through the airflow passage 16 with the airflow and is exported from the air outlet 161 for the user to inhale.
  • the atomizing core 30 is configured to atomize the e-liquid delivered to the atomizing core 30 into smoke.
  • the atomizing core 30 includes a heating assembly 31 and a liquid guiding member 32 .
  • the heating assembly 31 is provided on the liquid guiding member 32
  • the liquid guiding member 32 is fixed on the inner wall of the atomizing chamber 14 and is in fluid communication with the liquid outlet 132 .
  • the liquid guiding member 32 is configured to transmit the e-liquid in the liquid storage chamber 13 to the heating assembly 31 and store the e-liquid temporarily.
  • the liquid guiding member 32 includes an absorbing surface 321 and an atomizing surface 322 .
  • the absorbing surface 321 faces the liquid outlet 132 , while the atomizing surface 322 is opposite to the absorbing surface 321 .
  • the heating assembly 31 is fixed on the atomizing surface 322 of the liquid guiding member 32 to heat and atomize the e-liquid transmitted from the liquid guiding member 32 to the heating assembly 31 .
  • the heating assembly 31 is provided on the liquid guiding member 32 by directly fixing, wrapping, winding and the like. In this embodiment, the heating assembly 31 is directly fixed on the liquid guiding member 32 .
  • the liquid guiding member 32 is an element having the function of absorbing e-liquid and/or transporting e-liquid, such as cotton, glass fiber, porous ceramics and the like.
  • the battery assembly 40 is received in the battery chamber 15 and electrically connected to the heating assembly 31 .
  • the battery assembly 40 is configured to provide the heating assembly 31 with electric energy required to atomize the e-liquid.
  • the aerosol generating device 100 further includes a mouthpiece 50 .
  • the mouthpiece 50 is in communication with the airflow passage 16 through the air outlet 161 .
  • the smoke flowing out through the air outlet 161 of the airflow passage 16 flows out through the mouthpiece for the user to inhale.
  • the aerosol generating device 100 may not include the mouthpiece 50 .
  • the aerosol generating device 100 further includes a heat insulating layer 60 .
  • the heat insulating layer 60 is disposed on the inner wall of the airflow passage 16 .
  • the heat insulating layer 60 is beneficial to preventing the heat loss in the airflow passage 16 , thereby preventing the smoke from rapidly cooling and condensing into e-liquid on the inner wall of the airflow passage 16 caused by the rapid temperature drop in the airflow passage 16 .
  • the aerosol generating device 100 further includes a liquid absorbing member 70 .
  • the liquid absorbing member 70 is arranged on the heat insulating layer 60 , and the liquid absorbing member 70 is configured to absorb condensed e-liquid.
  • the liquid absorbing member 70 is a hollow columnar or other shape.
  • the liquid absorbing member 70 is made of porous materials, such as superabsorbent resin, sponge, cotton, paper, porous ceramics or other porous materials.
  • the aerosol generating device 100 further includes a liquid absorbing member 70 .
  • the liquid absorbing member 70 is arranged on the inner wall of the airflow passage 16 , which is not shown.
  • the first embodiment of the present disclosure provides a heating assembly 31 a.
  • the heating assembly 31 a includes a substrate 311 and a heat insulation structure 314 , at least one heat generating element 315 and at least two electrical contacts 317 formed on the substrate 311 , wherein the heat insulation structure 314 is located between the heat generating element 315 and the electrical contacts 317 .
  • the heat generating element 315 is configured to generate heat, so as to heat and atomize the e-liquid transmitted from the liquid guiding member 32 to the heating assembly 31 a.
  • the electrical contacts 317 are electrically connected to the heat generating element 315 .
  • the heat insulation structure 314 is configured to reduce or prohibit heat transfer between the electrical contacts 317 and the heat generating element 315 , so as to limit the heat loss caused by the heat generating element 315 , and prevent the heat generated by the heat generating element 315 from rapidly transferring to the electrical contacts 317 to cause the temperature of the electrical contacts 317 to be too high.
  • the forms of heat transfer include radiation, conduction, and convection.
  • the heat generating element 315 is electrically connected to the electrical contacts 317 through conductive wires 318 .
  • the heat generating element 315 is electrically connected to the two electrical contacts 317 through two conductive wires 318 , with each conductive wire 318 being connected between the heat generating element 315 and a corresponding electrical contact 317 .
  • the conductive wire 318 includes but not limited to metal paste, metal film, and lead.
  • the heat insulation structure 314 may be a structure with low thermal conductivity such as a heat insulating layer, a heat insulating member, or an air cavity.
  • the heat insulating layer may be formed on the surface of the substrate 311 , or formed inside the substrate 311 .
  • the heat insulation structure 314 is made of a material with low thermal conductivity, or a part of the substrate 311 is directly made of a material with low thermal conductivity.
  • the heat insulation structure 314 can be formed by methods including but not limited to chemical etching, laser etching, electroplating, physical vapor deposition, and chemical vapor deposition.
  • the heat insulation structure 314 is an air cavity.
  • the heat insulation structure 314 is at least one group of air cavities 314 .
  • the heat insulation structure 314 includes two groups of air cavities 314 , and each group of air cavities 314 is consisted of two air cavities 314 .
  • the air cavity 314 penetrates through the substrate 311 along the thickness direction of the substrate 311 , and the air cavity 314 is in contact with the external air.
  • the substrate 311 is roughly in the shape of a thin sheet or a thin plate, and has a first main surface A 1 and a second main surface A 2 which are oppositely arranged. It can be understood that the first main surface A 1 and the second main surface A 2 may be circular, elliptical, or polygonal such as triangular, rectangular, trapezoidal, pentagonal, etc., which are not limited here. Optionally, the first main surface A 1 and the second main surface A 2 are substantially planar.
  • the material for preparing the substrate 311 may be metal oxide, nitride, carbide or the like.
  • the substrate 311 is made of ceramic material, and further, the material of the substrate 311 is aluminosilicate.
  • the substrate 311 includes two opposite first side edges 3111 in the first direction X 1 and two opposite second side edges 3112 in the second direction X 2 .
  • the first main surface A 1 of the substrate 311 is rectangular, and the two first side edges 3111 are perpendicularly connected to the two second side edges 3112 .
  • the first main surface A 1 of the substrate 311 may also be in other polygonal or circular shapes, so that the substrate 311 also includes other side edges, the two first side edges 3111 and the two second side edges 3112 are respectively connected to at least one other side edge. If the cross-section of the substrate 311 is circular, the first side edges 3111 may be simplified as two tangent points in the first direction X 1 , and the second side edges 3112 may be simplified as two tangent points in the second direction X 2 .
  • a third direction X 3 is defined along the vertical direction of the first main surface A 1 , and the third direction X 3 is the thickness direction of the substrate 311 .
  • the substrate 311 has a thickness of about 0.4 mm, a total width of 12.0 mm, and a thermal conductivity of about 3 Wm ⁇ 1 K ⁇ 1 .
  • the heating assembly 31 a includes two groups of four air cavities 314 and two electrical contacts 317 .
  • the two groups of air cavities 314 are respectively arranged on both sides of the heat generating element 315 , and an electrical contact 317 is provided on one side of each group of air cavities 314 away from the heat generating element 315 .
  • the heat generating element 315 is arranged at the center of the substrate 311
  • the electrical contacts 317 are arranged at the ends of the substrate 311 .
  • the two air cavities 314 of each group are aligned in the second direction X 2 .
  • each of the air cavities 314 includes two opposite third side edges 3141
  • each of the air cavities 314 includes two opposite fourth side edges 3142 .
  • the two third side edges 3141 are parallel to the two first side edges 3111
  • the two fourth side edges 3142 are parallel to the two second side edges 3112 .
  • the first main surface A 1 of the substrate 311 is rectangular
  • the two first side edges 3111 are perpendicularly connected to the two second side edges 3112 .
  • the cross-section of the air cavity 314 on the first main surface A 1 is also rectangular.
  • the two third side edges 3141 are perpendicularly connected to the two fourth side edges 3142 .
  • each air cavity 314 is rectangular and has a length extending along the length direction of the substrate 311 .
  • the first direction X 1 is the length direction of the substrate 311
  • the second direction X 2 is the width direction of the substrate 311 .
  • the cross-section of the air cavity 314 on the first main surface A 1 may also be in polygonal or circular shapes, and thus the air cavity 314 also includes other side edges, and the two third side edges 3141 and the two fourth side edges 3142 are respectively connected to at least one other side edge. If the cross-section of the air cavity 314 on the first main surface A 1 is circular, the third side edges 3141 can be simplified as two tangent points in the first direction X 1 , and the fourth side edges 3142 can be simplified as two tangent points in the second direction X 2 .
  • the heating assembly 31 a is divided into at least one cold area 303 , at least one transition area 302 and at least one hot area 301 , wherein one end of the transition area 302 is connected to the cold area 303 , and the other end of the transition area 302 is connected to the hot area 301 .
  • the cold area 303 refers to the area jointly enclosed by the two second side edges 3112 , the extension line RR′ of the third side edge 3141 of at least one air cavity 314 adjacent to the electrical contact 317 , and the first side edge 3111 adjacent to the electrical contact 317 .
  • the transition area 302 refers to the area jointly enclosed by the two second side edges 3112 and the extension lines RR′ and QQ′ of the two opposite third side edges 3141 of at least one air cavity 314 .
  • the hot area 301 refers to the area jointly enclosed by the two second side edges 3112 and the extension lines PP′ and QQ′ of the third side edges 3141 of the air cavities 314 located at opposite sides of the heat generating element 315 , or refers to the area jointly enclosed by the two second side edges 3112 , the extension line PP′ of the third side edge 3141 of at least one air cavity 314 adjacent to the heat generating element 315 , and the first side edge 3111 adjacent to the heat generating element 315 .
  • the electrical contact 317 is located in the cold area 303 , the air cavity 314 is located in the transition area 302 , the heat generating element 315 is located in the hot area 301 .
  • the heating assembly 31 a is divided into two cold areas 303 , two transition areas 302 and a hot area 301 along the length direction of the substrate 311 , wherein the hot area 301 is located at the center of the substrate 311 , the two cold areas 303 are located at opposite ends of the substrate 311 , the two transition areas 302 are respectively located at two opposite sides of the hot area 301 with each transition area 302 being located between the hot area 301 and a corresponding cold area 303 ; the heat generating element 315 is arranged in the hot area 301 , the two electrical contacts 317 are respectively arranged in the two cold areas 303 , the heat insulation structure 314 includes two groups of air cavities 314 , and the two groups of air cavities 314 are respectively arranged in the two transition areas 302 .
  • a transition area 302 is provided between the hot area 301 and the cold area 303 .
  • the hot area 301 refers to the area enclosed by the two second side edges 3112 , the extension lines PP′ and QQ′ of the third side edges 3141 of the air cavities 314 adjacent to the heat generating element 315 .
  • the cross-sectional area of each of the air cavities 314 on the first main surface A 1 is A 1
  • the total cross-sectional area of the first main surface A 1 of the substrate 311 is A 2
  • the ratio of the total cross-sectional area mA 1 of the air cavities 314 to the total cross-sectional area A 2 of the substrate 311 is defined as the quality index E of the heating assembly 31 a, wherein the quality index E can reflect the thermal decoupling efficiency of the heating assembly 31 a.
  • the distance between opposite side edges of the hot area 301 is L 1
  • the distance between the two third side edges 3141 of each air cavity 314 is L 2 ; optionally, L 2 /L 1 >60%.
  • L 2 is 6 mm. This structure can achieve effective thermal decoupling.
  • the heat generating element 315 can be an embedded thick film resistance heater, a heating coating, a heating coil, a heating sheet, a heating net and the like.
  • the material for preparing the heat generating element 315 may be noble metal or common metal or conductive oxide.
  • the noble metal may be ruthenium, platinum, gold, silver, palladium or their alloys.
  • the common metal can be copper or nickel and the like.
  • the conductive oxide may be ruthenium oxide or the like.
  • the heat generating element 315 is made of platinum.
  • the thermal conductivity of the heat generating element 315 is about 72 Wm ⁇ 1 K ⁇ 1 .
  • the heat generating element 315 is two embedded thick film resistance heaters.
  • the heat generating element 315 has a thickness of 0.01 mm and a width of 0.6 mm.
  • L 5 the distance between the first side edge 3111 and the third side edge 3141 of the air cavity 314 adjacent to the first side edge 3111 is defined as L 5 , then L 5 should be long enough to facilitate the installation of the electrical contact 317 .
  • the area of the electrical contact 317 must be large enough to be compatible with standard electrical contacts in the atomizing core 30 of the aerosol generating device 100 .
  • the heating assembly 31 a further includes a plurality of releasing holes 316 .
  • the releasing hole 316 penetrates through the substrate 311 along the third direction X 3 and is located in the hot area 301 .
  • the releasing holes 316 are arranged corresponding to the liquid guiding member 32 , and are configured for releasing the smoke generated by the atomization of the heat generating element 315 into the atomizing chamber 14 .
  • each releasing hole 316 is define as A 3 , then optionally, the ratio of the total cross-sectional area nA 3 of the releasing holes 316 to the total cross-sectional area A 2 of the substrate satisfies: 0.03% ⁇ nA 3 /A 2 ⁇ 9.00%, wherein n is the number of the releasing holes 316 , n is a positive integer and n>0.
  • the ratio of the total cross-sectional area of the releasing holes 316 to the total cross-sectional area of the substrate 311 is a quality factor of the releasing holes 316 and can be used to characterize the effectiveness of the releasing holes 316 .
  • the cross-section corresponding to the cross-sectional area is parallel to the first main surface A 1 or the first main surface A 2 .
  • each releasing hole 316 is defined as r 1 , then optionally, 0.01 ⁇ r 1 /L 1 0.1. Such arrangement is beneficial to release the smoke generated by the atomization of the heat generating element 315 into the atomizing chamber 14 .
  • the shortest distance from the edge of the releasing hole 316 adjacent to the air cavity 314 to the edge of the adjacent air cavity 314 is defined as L 3 , L 3 /L 1 >10%.
  • the distance from the edge of the releasing hole 316 adjacent to the second side edge 3112 to the adjacent second side edge 3112 is defined as L 4 , L 4 /L 1 >10%.
  • a heating assembly 31 b is provided in the second embodiment of the present disclosure, the structure of the heating assembly 31 b is similar to that of the heating assembly 31 a, the only difference is that the air cavities 314 are only arranged on one side of the heat generating element 315 .
  • the electrical contacts 317 are all located at one end of the substrate 311 , and are not separately located at both ends of the substrate 311 , so that the heating assembly 31 b has a larger heating area.
  • the heating assembly 31 b is divided into a hot area 301 , a cold area 303 and a transition area 302 along the length direction of the substrate 311 , the hot area 301 is located at the center of the substrate 311 and extends to one end of the substrate 311 , the cold area 303 is located at the other end of the substrate 311 , the transition area 302 is located between the hot area 301 and the cold area 303 ; wherein the heat generating element 315 is arranged in the hot area 301 , the two electrical contacts 317 are arranged in the cold area 303 , the heat insulation structure 314 includes a group of air cavities 314 , and the group of air cavities 314 is arranged in the transition area 303 . Specifically, the group of air cavities 314 is consisted of two air cavities 314 . In this embodiment, each air cavity 314 is rectangular and has a length extending along the length direction of the substrate 311 .
  • the resistance value of the heating assembly 31 a can be calculated by the following formulas:
  • R thermal is the absolute thermal resistance
  • L bridge is the length of the air cavity 314 in the first direction X 1 (that is, L 2 in FIG. 2 )
  • kn is the thermal conductivity of the material or the air
  • T is the thickness of the heating assembly 31 a
  • W i is the width of each part, and in the present embodiment, W i corresponds to W 1 , W 2 , and W 3 described above.
  • the total thermal resistance R bridge of the heating assembly 31 a is composed of several resistances connected in parallel, including the resistance (R air1 +R air2 ) of the two groups of air cavities 314 , the resistance R center of the substrate 311 between the two groups of air cavities 314 , the resistance R side1 and resistance R side2 of the substrate 311 between the air cavities 314 and the corresponding two first side edges 3111 , and the resistances R Pt1 and R Pt2 of the conductive wires 318 .
  • the total width W of the substrate 311 is 12.0 mm
  • W 1 , W 2 , W 3 are 3 mm, 4 mm and 1 mm respectively
  • the embedded thick film resistance heater has a thickness of 0.01 mm and a width of 0.6 mm
  • the length of the air cavity 314 is 6 mm.
  • the substrate 311 has a thickness of about 0.4 mm, a total width of 12.0 mm, and a thermal conductivity of about 3 Wm ⁇ 1 K ⁇ 1 .
  • the material of the embedded thick film resistance heater is platinum, and the thermal conductivity of the embedded thick film resistance heater is about 72 Wm ⁇ 1 K ⁇ 1 .
  • the thermal conductivity of the air in the air cavity 314 is about 0.04 Wm ⁇ 1 K ⁇ 1 .
  • the thermal resistance of each air cavity 314 is 463 KW ⁇ 1 .
  • FIG. 5 is an IR characteristic diagram of the heating assembly 31 b shown in FIG. 4 when working at 550° C. It can be seen from the figure that the air cavity 314 is used to realize the transition between the heat generating element 315 and the electrical contacts 317 of the heating assembly 31 b, so that the temperature of the cold area 303 can be maintained below 100° C., while the hot area of the heating assembly 31 b is maintained at a temperature of 550° C. to 560° C. This shows that the heating assembly 31 b has good heating uniformity and a lower level of heat transfer, so that the hot area 301 where the heat generating element 315 is located and the cold area 303 where the electrical contacts 317 are located can be effectively isolated.
  • a heating assembly 31 c is provided in the third embodiment of the present disclosure, the structure of the heating assembly 31 c is similar to that of the heating assembly 31 b, the only difference is that the two air cavities 314 are aligned in the first direction X 1 .
  • each air cavity 314 is rectangular and has a length extending along the width direction of the substrate 311 .
  • the heating assembly includes a heat generating element, a heat insulation structure (air cavity) and electrical contacts, and the air cavity is arranged between the electrical contacts and the heat generating element. Because the air cavity is filled with air and the thermal conductivity of air is low, therefore, the air cavity can limit heat loss of the hot area and prevent the heat of the hot area from rapidly transferring to the cold area to cause the temperature of the cold area to be too high, thereby not only improving the atomizing efficiency of the atomizing core and the aerosol generating device, but also reducing the heat resistance requirements of the heating assembly, the atomizing core and the aerosol generating device for the electrical contacts.
  • the present disclosure also provides a method for manufacturing a heating assembly, including:
  • Step 1 forming a substrate by casting.
  • a mixture of ceramic powder and organic components is cast into a strip-shaped substrate with a thickness of 0.2 mm to 2 mm.
  • Step 2 processing the substrate to form a desired structure.
  • the strip-shaped substrate is cut into a desired size so as to be used as the substrate for a heating assembly
  • a heat insulation structure is formed on the substrate by laser cutting or stamping process, and the heat insulation structure may be an air cavity, or a heat insulating member, and the like.
  • this step may also include forming releasing holes and/or electrical through holes on the substrate by laser cutting or stamping.
  • Step 3 printing a heat generating element and electrical contacts on the substrate.
  • This step includes printing the heat generating element (resistance heating material) of a required pattern and the electrical contacts on the substrate to form a semi-finished product by screen printing process.
  • the electrical contacts include electrical pads. Further, this step also includes printing conductive wires on the substrate, the conductive wires are configured to connect the heat generating element to the electrical contacts.
  • Step 4 drying the semi-finished product obtained in step 3.
  • Step 5 stacking the semi-finished products obtained after drying in step 4, wherein the heat generating element is embedded inside the substrate, and the electrical contacts are located on the surface of the substrate.
  • Step 6 thermally compressing the semi-finished products obtained in step 5 at a temperature of 40° C.-100° C., and then sintering at a high temperature (800° C.-1600° C.) to remove organic components and finally to become a whole.

Landscapes

  • Resistance Heating (AREA)
US18/075,390 2020-06-05 2022-12-05 Heating assembly, atomizing core and aerosol generating device Pending US20230094947A1 (en)

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CN202021019700.2U CN213215346U (zh) 2020-06-05 2020-06-05 加热组件、雾化芯及气溶胶生成装置
CN202021019700.2 2020-06-05
PCT/CN2020/108189 WO2021243843A1 (zh) 2020-06-05 2020-08-10 加热组件、雾化芯及气溶胶生成装置

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