CN217446666U - Ceramic heating body, atomizer and aerosol generating device - Google Patents

Abstract

The application discloses a ceramic heating body, an atomizer and an aerosol generating device, wherein the atomizer comprises a shell; the porous liquid guide body is divided into two sections along the longitudinal direction, namely a first section and a second section, wherein the outer diameter of the first section is smaller than that of the second section, and the second section forms a step surface relative to the first section; a heating element fixed on the porous liquid guide; the porous liquid guide body is accommodated in the accommodating cavity of the bracket; a first sealing element, at least a portion of the first sealing element surrounding an outer side surface of the second segment. In the above atomizer, the first sealing member is circumferentially disposed on the outer side surface of the second segment to provide a seal between the inner wall surface of the accommodating chamber of the holder and the outer side surface of the second segment, thereby preventing leakage of the liquid substrate.

Description

Ceramic heating body, atomizer and aerosol generating device

Technical Field

The embodiment of the application relates to the field of aerosol generating devices, in particular to a porous liquid guide body, an atomizer and an aerosol generating device.

Background

The aerosol generating device comprises an atomizer and a power supply component, wherein a core component of the atomizer is an atomizing component, and the atomizing component mainly atomizes a liquid substrate stored in the atomizer to generate aerosol; there exists a class of substantially tubular atomizing assemblies, essentially comprising a ceramic heating body comprising a ceramic liquid conductor and a heating element secured to the ceramic liquid conductor; in the prior art, the ceramic liquid guide body is usually constructed into a hollow cylindrical structure with the same outer diameter, part of the outer surface of the ceramic liquid guide body is usually fixed in an inner cavity of a support in a sealing mode by means of liquid guide cotton, but the liquid guide cotton is usually wound and fixed on the periphery of the ceramic liquid guide body manually, the requirement for manual cotton winding operation is relatively high, different operators are trained repeatedly in time and are difficult to achieve the same operation, so that the sealing degree of the liquid guide cotton to the ceramic liquid guide body is inconsistent in different ceramic heating bodies, and the leakage of a liquid matrix is caused by the poor sealing effect; meanwhile, due to the fact that the process of manually winding cotton exists, the atomization assembly is difficult to achieve automatic assembly.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the sealing effect of sealing a porous liquid guide of an atomizer by using liquid guide cotton in the prior art is poor, the embodiment of the application provides an atomizer, which comprises a shell, wherein a liquid storage cavity is defined and formed in the shell, and the liquid storage cavity is used for storing a liquid matrix; a porous liquid-conducting body configured to have a hollow tubular structure; the porous liquid guide body comprises a first section and a second section which are arranged along the longitudinal direction of the porous liquid guide body, the outer diameter of the first section is smaller than that of the second section, and a step surface is formed by transition between the second section and the first section; a heating element affixed to the ceramic conductive liquid for atomizing the liquid matrix; the porous liquid guiding body is arranged in the accommodating cavity of the bracket, and holes are formed in the bracket and used for guiding the liquid matrix to enter the accommodating cavity so as to be absorbed by the porous liquid guiding body; a first sealing element, at least a portion of the first sealing element surrounding an outer side surface of the second section to provide a seal between an inner wall surface of the receiving cavity and the outer side surface of the second section.

In some embodiments, the heating element is disposed along a longitudinal extension of the porous liquid conducting body, and the heating element is confined to extend within a longitudinal extension of the first segment of the porous liquid conducting body.

In some embodiments, further comprising a second sealing element at least partially surrounding an outside surface of an end of the first segment facing away from the second segment

In some embodiments, a portion of the outer wall surface of the porous liquid guide, which is not surrounded by the first sealing element and the second sealing element, and an inner wall surface of the bracket define a liquid guide cavity therebetween, and the liquid matrix inside the liquid storage cavity enters the liquid guide cavity through the holes to be transferred to the porous liquid guide.

In some embodiments, the wall thickness of the first section is less than the wall thickness of the second section.

In some embodiments, the first section has a wall thickness in the range of 0.5mm to 1.2mm and the second section has a wall thickness in the range of 1.2mm to 3 mm.

In some embodiments, the receiving cavity of the stent includes a first portion and a second portion, the first portion having an inner diameter smaller than an inner diameter of the second portion, the first portion of the receiving cavity being configured to receive the first section of the porous fluid conducting body, and the second portion of the receiving cavity being configured to receive the second section of the porous fluid conducting body.

In some embodiments, a first ventilation channel is formed between the first sealing element and the porous liquid guide body, and the first ventilation channel is used for guiding external air flow to the liquid storage cavity.

In some embodiments, the first gas exchange channel comprises at least one groove extending on an outer surface of the second section of the porous liquid guide, the groove communicating with the reservoir chamber.

In some embodiments, the grooves extend non-linearly along the longitudinal direction.

In some embodiments, the groove extends substantially in a zigzag or S-shape.

In some embodiments, the grooves comprise a first section of groove and a second section of groove which are communicated with each other, the width of the second section of groove is larger than that of the first section of groove, and the second section of groove is communicated with the liquid storage cavity.

In some embodiments, the first ventilation channel further comprises a first notch disposed on the second sealing element, the first notch communicating the recess with the reservoir.

In some embodiments, the first ventilation channel longitudinally corresponds to a location of the aperture on the stent when the porous fluid conducting and first sealing element are received within the receiving cavity.

In some embodiments, a first stop structure is disposed on the first sealing element for providing a stop to prevent rotation of the porous liquid guide relative to the first sealing element.

In some embodiments, a first matching portion matched with the first limiting structure is further arranged on the porous liquid guide body, and the first matching portion protrudes from the step surface.

In some embodiments, the porous liquid guide further comprises a third sealing element at least partially housed inside the support, and the third sealing element is in longitudinal abutment with the porous liquid guide.

In some embodiments, the third sealing element further comprises a second stop portion for cooperating with the carrier to prevent rotation of the third sealing element relative to the carrier.

In some embodiments, a second matching portion matched with the second limiting portion is arranged on the bracket, and the second matching portion includes a second notch.

In some embodiments, the third sealing element comprises a cavity adjacent an end face of the second section, the cavity for receiving condensate.

In some embodiments, the atomizer further comprises an electrical connection in electrical connection with the heating element, and a barrier disc is disposed on the third sealing element and extends from an end of the third sealing element towards the electrical connection.

In some embodiments, a vent is provided on the third sealing element.

In some embodiments, at least a portion of the third sealing element is recessed inwardly such that an air-conducting cavity is formed between the third sealing element and the inner wall of the bracket, the air-conducting cavity being in communication with the air vent.

In some embodiments, two ends of the heating element are connected with conductive pins, and the conductive pins penetrate out of the porous liquid guide body; wherein, the extending direction of the conductive pin is arranged in a non-parallel way with the axis of the porous liquid guide body.

In some embodiments, the first seal includes a sleeve portion and a radial extension covering the step face.

Embodiments also provide a ceramic heating body for an aerosol-generating device, comprising a porous liquid conducting body for storing and delivering a liquid substrate and a heating element bonded to the porous liquid conducting body, the porous liquid conducting body being configured to have a hollow tubular structure, the porous liquid conducting body comprising a first section and a second section arranged longitudinally therealong, the first section having an outer diameter smaller than the second section, the second section and the first section transitioning to form a step surface; a heated element for atomizing the liquid matrix.

In some embodiments, at least one groove is disposed on the outer porous liquid-conducting wall.

Embodiments of the present application further provide an aerosol-generating device, including the above-mentioned atomizer, and for the power supply module that the atomizer provides electric drive.

The porous liquid guide device has the advantages that the porous liquid guide body comprises a first section and a second section which are different in outer diameter, a step surface is formed between the second section and the first section, the first sealing element is arranged on the outer side surface of the second section in a surrounding mode to provide sealing between the inner wall surface of the accommodating cavity of the support and the outer side surface of the second section, leakage of liquid matrix is prevented, and compared with the sealing method using liquid guide cotton, the porous liquid guide device is small in deformation and stable in sealing effect; and the process of manually winding the liquid guide cotton on the outer surface of the porous liquid guide is omitted, so that the assembly of the atomization assembly can be automatically assembled.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Figure 1 is a schematic structural diagram of an aerosol-generating device provided by an embodiment of the present application;

FIG. 2 is a cross-sectional view of an atomizer provided in an embodiment of the present application;

FIG. 3 is an exploded view of an atomizer provided in an embodiment of the present application;

fig. 4 is a perspective view of a ceramic heating body provided in an embodiment of the present application;

fig. 5 is a perspective view of a further perspective view of the ceramic heating body provided in the embodiment of the present application;

fig. 6 is a sectional view of a ceramic heating body provided in an embodiment of the present application;

FIG. 7 is an exploded view of an atomizing assembly provided in accordance with an embodiment of the present application;

FIG. 8 is a perspective view of a third sealing element provided by an embodiment of the present application;

fig. 9 is a perspective view of a first sealing element provided in an embodiment of the present application.

Detailed Description

To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description.

It should be noted that all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) in the embodiments of the present application are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly, the "connection" may be a direct connection or an indirect connection, and the "setting", and "setting" may be directly or indirectly set.

In addition, descriptions in this application as to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

The aerosol-generating device comprises an atomizer and a power supply assembly providing an electrical drive for the atomizer. Aerosol-generating devices generate aerosols by atomizing a liquid substrate they store, and can be classified into electronic cigarettes and medical device devices according to the liquid substrate they store. The liquid matrix stored in the electronic cigarette comprises a nicotine preparation, glycerin, propylene glycol, essence, spice, flavor components and the like, and the aerosol generated by smoking the electronic cigarette by a user mainly meets the requirement on the nicotine or the flavor components. As medical device devices, the liquid matrix stored inside the device comprises active functional components, glycerin, propylene glycol and the like, and the aerosol generated by the device when a user inhales is mainly used for treating respiratory diseases or inhales certain medicinal active ingredients through the lung. The related embodiments provided in the present application can be applied to the above two types of apparatuses, and are not limited herein.

The nebulizer 100 and power supply assembly 200 may be housed within a single housing to form a small, portable, disposable aerosol generating device. The nebulizer 100 and power module 200 may also be configured as two separate modules that are connected by a separable connection to form a combined aerosol-generating device. In one example thereof, a portion of the interior cavity of the housing of the power supply assembly defines a receiving cavity into which the atomizer is insertable from one end of the housing of the power supply assembly and at least a portion of a surface of the atomizer is retainable within the receiving cavity. The two components can be connected in a magnetic adsorption or snap connection mode, so that stable connection is formed between the two components. In another example, referring to fig. 1, a threaded sleeve is provided at the end of the atomizer 100, a threaded groove is provided at the end of the power module 200, and the two modules are screwed together. Electrical connection components are provided at both the connection end of the atomizer 100 and the connection end of the power module 200 so that the electrical circuit between the two components remains in communication after the two components are connected. The internal structure of the power module 200 may be configured in a conventional manner, for example, a control module and a charging module are provided therein, which is not specifically described in the embodiment section of the present application.

The following section mainly describes the structure of the internal components of the atomizer 100 in detail, and referring to fig. 2 and 3, taking the structure of the atomizer 100 with a substantially cylindrical shape as an example, it should be noted that the atomizer 100 may have any other shape in the prior art without affecting the implementation of the embodiments provided in the present application, and the atomizer 100 includes a housing assembly 10, from the outside, the housing assembly 10 includes a suction nozzle 11 and a housing 12, the suction nozzle 11 is substantially flat, and a user mainly contacts with the suction nozzle 11 during the use of the aerosol generating device, therefore, the suction nozzle 11 may be preferably made of plastic material with high safety, such as PP (polypropylene). Housing 12 may preferably be made of a transparent or translucent material, such as glass, so that a user can view the consumption of the liquid matrix within housing 12. The suction nozzle 11 is connected to one end of the housing 12, and a bottom cover 13 is connected to the other end of the housing 12, and one end of the bottom cover 13 is provided with a threaded sleeve 131.

The housing assembly 10 of the atomizer 100 is mainly provided with the atomizing assembly 20 therein, and the atomizing assembly 20 has a substantially hollow tubular structure. A portion of the interior cavity of the housing 12 is spatially defined to form a reservoir 121, and the reservoir 121 is configured to be disposed about the atomizing assembly 20 such that the liquid substrate within the reservoir 121 is maintained at a relatively uniform rate into the interior of the atomizing assembly 20.

The atomizing assembly 20, which is a core functional component of the atomizer 100, mainly includes a liquid guiding element toward which the liquid substrate stored in the reservoir chamber 121 can flow and be absorbed and stored by the liquid guiding element, and a heating element configured to be combined with at least a portion of the liquid guiding element and atomize the liquid substrate delivered by the liquid guiding element to generate aerosol. The heating element can be a spiral heating wire made of at least one of stainless steel, nickel-chromium alloy, iron-chromium-aluminum alloy, metal titanium and the like or a heating sheet with a grid structure. The liquid guiding elements can be roughly divided into two types according to different preparation materials, the first type of liquid guiding element is prepared by materials with capillary structures, such as non-woven fabrics, cellucottons and the like, and besides the liquid matrix can be transferred by the liquid guiding elements, the liquid guiding element body can also store a certain amount of liquid matrix. The second type of liquid-conducting element is made of a ceramic material with a hard porous structure, and the liquid-conducting element has enough hardness to support the heating element. In the prior art, the two types of liquid guiding elements are combined to form a liquid guiding assembly, so that the ceramic liquid guiding body of the hard part is used for fixing the heating element, the liquid guiding cotton of the soft part surrounds the ceramic liquid guiding body and is used for improving the liquid guiding capacity, and meanwhile, the soft liquid guiding cotton is wrapped and wound on the outer surface of the ceramic liquid guiding body, so that the ceramic liquid guiding body can be effectively sealed, and a liquid matrix is prevented from leaking along the surface of the ceramic liquid guiding body; and the winding fixing operation methods of different operators and the arrangement positions of the liquid guide cotton are greatly different, so that the liquid guide capability and the atomization effect of the aerosol generating device are different.

In order to optimize the structure of the liquid guiding element and the sealing performance of the atomizer, one embodiment of the present application provides a porous liquid guiding body 21 having excellent structure and performance, and as shown in fig. 4 to 6, the porous liquid guiding body 21 is made of a ceramic material and is configured to have a hollow tubular structure, and the porous liquid guiding body 21 can be roughly divided into two sections, a first section 211 and a second section 212, respectively, along the axial direction thereof. Wherein the outer diameter of the first section 211 is smaller than the outer diameter of the second section 212, thereby forming a step surface 213 between the second section 212 and the first section 211. In some examples, the inner diameter of the first section 211 of the porous liquid guide 21 is not uniform with the inner diameter of the second section 212, and the inner cavity of the porous liquid guide 21 is configured as an irregular cavity, whereby the wall thickness of the first section 211 and the wall thickness of the second section 212 are designed to form an optimization according to the shape of the cavity. In a preferred embodiment, the wall thickness of the first section 211 is smaller than the wall thickness of the second section 212, the first section 211 of the porous liquid conducting body 21 is used for transferring and storing part of the liquid matrix, and the thicker wall thickness of the second section 212 of the porous liquid conducting body 21 is mainly used for storing the liquid matrix. Specifically, the wall thickness of the first section 211 can be set in the range of 0.5mm to 1.2mm, and the wall thickness of the first section 211 of the porous liquid guide 21 can be set to any value between 0.5 and 1.2mm, such as 0.7mm, 0.9mm, 1.0mm, and 1.2 mm. The wall thickness of the second section 212 may be set in the range of 1.2mm to 3mm, and the specific wall thickness of the second section 212 of the porous liquid guide 21 may be set to any value between 1.2 and 3, such as 1.5mm, 1.8mm, 2.0mm, 2.5mm, etc. In one example, the first section 211 of the porous liquid conducting body 21 has a wall thickness of 1mm and the second section 212 of the porous liquid conducting body 21 has a wall thickness of 1.5 mm. The heating element is fixed in the inner cavity of the porous liquid guide 21, the porous liquid guide 21 transfers the liquid substrate absorbed by the porous liquid guide to the heating element, and the heating element atomizes the liquid substrate to generate aerosol. In the case of a tubular porous liquid conducting body 21, the liquid matrix enters through the outer surface of the porous liquid conducting body 21 and permeates into the interior of the porous liquid conducting body 21, while the porous liquid conducting body 21 absorbs and transfers the liquid matrix mainly through the porous structure inside thereof, and the liquid matrix permeates into the interior of the porous liquid conducting body 21 layer by means of capillary force and finally reaches the inner surface of the porous liquid conducting body 21, thereby transferring to the surface of the heating element. Thus, the thicker the wall thickness of the porous liquid conducting body 21, the more liquid matrix it can store, the stronger its liquid locking capacity; meanwhile, the thicker the wall thickness of the porous liquid guide body 21 is, the larger the area of the end face of the porous liquid guide body which is away from the liquid storage cavity 121 is, the higher the tension of the liquid when the end face of the porous liquid guide body is attached to the end face of the porous liquid guide body is, the liquid is difficult to separate from the end face of the porous liquid guide body, and the possibility of liquid leakage is lower; the thicker the wall thickness of the porous liquid conducting body 21, the greater the mass transfer resistance of the liquid matrix from the outer surface of the porous liquid conducting body 21 to the inner surface of the porous liquid conducting body 21, resulting in a lower liquid conducting capacity of the porous liquid conducting body 21. Through repeated tests on the liquid guiding rate of the liquid matrix with various performances and the heating efficiency of the heating element, and analysis and synthesis of design size factors of the atomizer product, when the wall thickness of the porous liquid guiding body 21 is in the range of 0.5mm-1.2mm, the liquid guiding rate of the porous liquid guiding body 21 and the heating rate of the heating element can maintain a good balance, namely, the heating element can atomize the liquid matrix transferred by the porous liquid guiding body 21 in time without generating the phenomenon that the liquid matrix is gathered and boiled near the heating element to generate a corrigent sound, or the liquid matrix is not supplied in time to enable the heating element to generate dry burning in the absence of the liquid matrix. And in a preferred embodiment, the wall thickness of the porous liquid guiding body 21 is uniform throughout the first section 211, so that the liquid guiding capacity and the liquid storage capacity of the porous liquid guiding body 21 are uniform throughout the first section 211, and further, the heating element can atomize the liquid matrix delivered at a uniform speed, so that the atomizer can maintain relatively stable TPM (amount of smoke sucked per mouth).

By providing two sections of porous liquid conducting body 21 with different wall thicknesses and fixing the heating element 21 in the inner cavity of the first section 211 of the porous liquid conducting body 21, the inner cavity of the porous liquid conducting body 21 is mainly used for providing a gas flow channel. The second section 212 of the porous liquid conductive body 21 has a relatively thick wall that provides a relatively high liquid matrix storage capacity, allowing the region of the porous liquid conductive body 21 remote from the heating element to have a relatively high liquid storage capacity while preventing leakage of the liquid matrix from the bottom end thereof. The second section 212 of the porous liquid guide 21 has a wall thickness greater than that of the first section 211, and a step surface 213 is formed between the first section 211 and the second section 212, so that the porous liquid guide 21 can be fixed to the support member. Through testing, analyzing and measuring liquid matrixes with different viscosities, when the wall thickness of the porous liquid guiding body 21 is larger than 1.2mm, enough mass transfer resistance can be formed inside the porous liquid guiding body 21, so that the liquid matrixes can be stored inside the porous liquid guiding body 21, and the phenomenon that excessive liquid matrixes cannot be stored in the porous liquid guiding body 21 and cannot be atomized in time due to the fact that the excessive liquid matrixes are far away from a heating element, and accordingly leakage of the liquid matrixes is caused is avoided. Meanwhile, the first section 211 and the second section 212 of the porous liquid guide 21 are integrally formed, so that capillary force exists between the first section 211 and the second section 212, and the liquid matrix stored in the first section 211 and the liquid matrix stored in the second section 212 of the porous liquid guide 21 can flow each other. When more liquid matrix is stored per unit volume area of the first section 211 of the porous conducting liquid 21, the liquid matrix can flow to the area of the second section 212 of the porous conducting liquid 21. When less liquid matrix is stored per unit volume area of the first section 211 of the porous conducting liquid 21, the liquid matrix is able to flow from the area of the second section 212 of the porous conducting liquid 21 to the area of the first section 211 of the porous conducting liquid 21. The second section 212 of the porous liquid conducting body 21 has a maximum wall thickness of 3mm, taking into account the overall volume and weight of the porous liquid conducting body 21. It can be appreciated that if the wall thickness of the second section 212 of the porous liquid guide 21 is too large, the weight of the porous liquid guide 21 as a whole increases, and the difficulty of fixing it inside the atomizer increases; meanwhile, the volume occupied by the porous liquid guide body 21 is increased, which is not favorable for optimizing the overall structure of the atomizer.

In one example provided by the present application, the heating element 22 is provided in the form of a heating wire, and the heating wire is uniformly wound and fixed on the inner wall of the porous liquid guiding body 21, and is distributed in a spiral shape, and the winding pitch thereof is kept substantially the same, so as to balance the heating efficiency of the heating element 22 as a whole. The heater is made of a material with excellent high resistance characteristics, such as iron-chromium-aluminum or nickel-chromium alloy, conductive pins 221, namely a positive conductive pin and a negative conductive pin, are connected to two ends of the heater, and the heating element 22 is electrically connected with an electric connector on the atomizer 100 through the conductive pins, so that the heating element 22 is communicated with a power supply on the power supply assembly. The conductive pin is made of a material with low resistance, such as nickel. The heating wire is combined with the porous liquid guiding body 21 through an injection molding process, and the heating wire is basically arranged on the inner wall of the first section 211 of the porous liquid guiding body 21, two conductive pins at two ends of the heating wire extend into the interior of the porous liquid guiding body 21, pass through the second section 212 of the porous liquid guiding body 21 and penetrate out from the bottom end face of the second section 212 of the porous liquid guiding body 21.

In the process of conducting electricity, the conductive pins of the heating element 22 also generate heat, and the heat cannot generate effective value in the actual heating process, so that in order to avoid the two conductive pins generating more heat and causing energy waste, in the preferred embodiment provided in the present application, the wire diameter of the heating wire and the wire diameter of the conductive pins need to be controlled within a reasonable range. According to the resistance heating principle and repeated analysis and calculation, the wire diameter range of the heating element 22 is 0.14mm-0.18mm, and if the iron-chromium-aluminum alloy material is selected for preparation, the corresponding resistance range of the heating element 22 is 1.0-1.6 omega. The specific wire diameter of the heating element 22 can be optimally designed according to the heating power of the heating element required by the atomizer 100, and can be any value between 0.14 and 0.18 mm; the wire diameter of the conductive pins at the two ends of the heating element 22 ranges from 0.24mm to 0.30mm, and can be suitably adjusted according to the specific wire diameter of the heating element, so that any value between 0.24mm and 0.30mm can be selected.

Further, the heating element 22 extends substantially in the longitudinal direction of the porous liquid conducting body 21, and the longitudinal extension of the heating element 22 does not exceed the longitudinal extension of the first section of the porous liquid conducting body 21. Therefore, the second section 212 of the porous liquid guiding body 21 is configured as a liquid guiding area, and in order to avoid heat transmission to the outside through the second section 212 of the porous liquid guiding body 21, the wall thickness of the second section 212 of the porous liquid guiding body 21 is increased, which is beneficial to increase the heat capacity of the second section 212, so that the heat can be more effectively kept on the second section 212 of the porous liquid guiding body 21, the heat is prevented from being excessively diffused to the connecting component around the second section 212 of the porous liquid guiding body 21, and the utilization efficiency of the heat generated by the heating element 22 is improved.

In an embodiment of the present application, there is also provided a ceramic heating body 27, the ceramic heating body 27 comprising the above-mentioned porous liquid-conducting body 21 and a heating element 22, the porous liquid-conducting body 21 being used for transferring a liquid matrix to the heating element 22. Further, the embodiment of the present application also provides a preparation method of the ceramic heating body 27, which includes the following steps:

1. preparing slurry: and mixing the ceramic powder with a sintering agent, an organic auxiliary agent and a pore-forming agent to prepare the ceramic slurry. Wherein the ceramic powder comprises at least one of alumina, zirconia, silica, silicon nitride, silicon carbide, cordierite or mullite; the sintering agent comprises at least one of calcium carbonate, magnesium oxide, lanthanum oxide, barium oxide, zinc oxide and lithium oxide; the pore-forming agent comprises at least one of mineral wax, white wax, beeswax and ozokerite. The organic auxiliary agent is mainly a dispersant and comprises at least one of a fatty acid dispersant and an acrylic resin dispersant. By adding the organic auxiliary agent into the mixed slurry, the uniformity of mixing the ceramic slurry can be enhanced. Further, the ceramic powder accounts for 30-50% by weight of the ceramic slurry, the sintering agent accounts for 15-30% by weight of the ceramic slurry, and the pore-forming agent accounts for 20-40% by weight of the ceramic slurry.

2. Performing injection molding by using a ceramic injection molding machine to obtain a ceramic green body; wherein the injection pressure in the injection molding process is 0.5MPa to 5MPa, and the temperature is 50 ℃ to 100 ℃. During the ceramic injection molding process, the heating element 22 is fixed in the mold cavity so that the heating element 22 is molded together with the porous conductive liquid 21.

3. And degreasing and sintering the ceramic green body to obtain the porous ceramic.

The atomizing assembly 20 further includes a holder 23, and as shown in fig. 2 and 7, the porous liquid guide 21 is configured as a substantially hollow cylindrical structure, which is fixed in an inner cavity of the substantially tubular holder 23. The support 23 is preferably formed by drawing a metal material, and has a housing cavity 235, and the porous liquid 21 is housed inside the housing cavity 235. The receiving cavity 235 of the holder 23 includes a first portion and a second portion having different inner diameters, wherein the first portion has a smaller inner diameter for receiving the first section 211 of the porous liquid guide 21, and the second portion has a larger inner diameter for receiving the second section 212 of the porous liquid guide 21. A reservoir 121 is defined between the outer wall surface of the holder 23 and the inner wall surface of the housing 12. The holder 23 is further provided with a hole 231, and the liquid medium in the liquid storage chamber 121 can directly enter the accommodating chamber 235 through the hole 231.

In order to promote the liquid matrix to be introduced into the porous liquid guiding member 21 more quickly, the accommodating chamber 235 is provided with an excess space in addition to accommodating the porous liquid guiding member 21, that is, a substantially annular liquid guiding chamber 232 is defined between the inner wall of the bracket 23 and the outer surface of the porous liquid guiding member 21 not covered by the first sealing member 242 and the second sealing member 241, and the liquid guiding chamber 232 is used for further storing the liquid matrix transferred through the liquid storage chamber 121. And because this drain cavity 232 sets up, need not to twine the drain cotton again in the periphery that porous liquid 21 led, saved the operation of artifical cotton winding, atomization component 20 can realize automatic equipment. The porous liquid guide 21 is in a structure surrounded by the liquid guide cavity 232, so that the liquid matrix is transferred to the porous liquid guide 21 mainly by the capillary force of the porous liquid guide 21, the liquid guide speed is higher, and the liquid and the substance in the liquid storage cavity 121 enter the liquid guide cavity 232 only according to the liquid level rather than the capillary force of the liquid guide cotton, so that the porous liquid guide 21 is in a relatively stable liquid supply environment, the liquid guide speed of the porous liquid guide 21 is more favorably balanced, and the TPM (smoke volume per suction) of the atomizer is favorably stabilized.

Further, the porous liquid guiding body 21 is provided with a two-section structure, the heating element 22 is fixed on the inner wall of the first section 211 of the porous liquid guiding body 21, the liquid guiding cavity 232 is arranged on the periphery of the first section 211 of the porous liquid guiding body 21, and the liquid matrix can be rapidly transferred on the first section 211 of the porous liquid guiding body 21; while the second section 212 of the porous liquid guide 21, as its supporting section, has a strong liquid storage capacity, and the liquid medium can be stored inside it without leaking through its ends. Specifically, the second section 212 of the porous liquid guide 21 forms a step surface 213 with respect to the first section 211, and the porous liquid guide 21 is fixed inside the holder 23 by means of the step surface 213. In order to prevent the leakage of the liquid matrix, both ends of the porous liquid guide 21 are fixed inside the holder 23 by two sealing members, and both ends of the liquid guide chamber 231 are sealed by the sealing members provided at both ends of the porous liquid guide 21. Specifically, since the second section 212 of the porous liquid guiding body 21 is located at the lower end of the liquid level of the reservoir chamber 121, the liquid substrate mainly leaks to the outside through the connection slit of the second section 212 of the porous liquid guiding body 21, and therefore, the first sealing member 242, which mainly seals the porous liquid guiding body 21, is the first sealing member 242 provided on the outer surface of the second section 212 of the porous liquid guiding body 21, the first sealing member 242 is made of a silicone material, which has a better sealing effect, and the first sealing member 242 includes a sleeve portion provided so as to surround the outer side surface of the second section 212 of the porous liquid guiding body 21, and a radially extending portion provided so as to cover the step surface 213, and the step surface 213 of the porous liquid guiding body 21 is in sealing abutment against the inner wall surface of the first sealing member 242, so that the liquid substrate is difficult to leak to the outside through the connection end of the porous liquid guiding body 21. Further, the first sealing element 242 is configured to be a sleeve-like structure, which is sleeved on the whole outer side surface of the second section 212 of the porous liquid guiding body 21 and the step surface 213, and a plurality of ribs are further provided on the outer surface of the first sealing element 242, so that the first sealing element 242 can firmly seal the connecting gap between the bottom end of the second section 212 of the porous liquid guiding body 21 and the inner wall of the bracket 23, and the liquid matrix is difficult to leak to the outside through the connecting gap.

Further, a first sealing element 241 is also disposed at the upper end of the first section 211 of the porous liquid guide 21, and the second sealing element 241 may be made of cellucotton for sealing in addition to the silica gel material. The second sealing element 241 is generally configured as a sleeve-shaped structure, which is sleeved on a part of the outer surface of the first section 211 of the porous liquid guide 21, specifically, the second sealing element 241 covers the upper section side surface of the first section 211 of the liquid guide 21 and a part of the top end surface thereof, and the top end surface of the second sealing element 241 is longitudinally abutted on the inner wall of the bracket 23, and a plurality of convex ribs are further provided on the outer surface of the second sealing element 241, so that the second sealing element 241 can firmly seal the connecting gap between the top end of the first section 211 of the porous liquid guide 21 and the inner wall of the bracket 23, and the liquid matrix is difficult to leak to the outside through the connecting position. In a preferred embodiment, the longitudinal extension of the heating element 22 is not within the longitudinal extension of the second sealing element 241, so that the heat generated by the heating element 22 can be conducted less to the second sealing element 241 and the support 23, and thus less heat is lost.

The accommodating cavity 235 of the bracket 23 defines an atomizing cavity 25, and an air inlet channel and an air outlet channel both communicated with the atomizing cavity 25 are further arranged inside the housing. In one example, the support 23 extends longitudinally along its axial direction to form an outlet duct 233, one end of the outlet duct 233 extends into the inner cavity of the suction nozzle 11 and is connected with the suction nozzle 11 in a snap-fit manner, aerosol generated in the atomizing chamber 25 can be guided into the suction nozzle opening 110 through the inner cavity of the outlet duct 233 so as to be sucked by a user, and in an alternative embodiment, the outlet duct 233 can be formed separately and connected with one end of the support 23. In a preferred embodiment, a tight snap connection structure is configured between the outlet pipe 233 and the suction nozzle 11, specifically, a snap member is disposed on the outer wall of the outlet pipe 233, a mating member 15 is disposed in the inner cavity of the suction nozzle 11, the mating member 15 is substantially in the shape of a plunger, and a plurality of inverted snap structures are disposed on the mating member 15 at intervals, and the inverted snap structures cross over the side surface of the snap member on the outlet pipe 233 and form a longitudinal abutment with the bottom end surface of the snap member. Further, an upper sealing sleeve 14 is arranged between the suction nozzle 11 and the housing 12, an annular groove is arranged on the upper sealing sleeve 14, the lower end of the fitting piece 15 is accommodated in the annular groove of the upper sealing sleeve 14, and the inner wall surface of the upper sealing sleeve 14 abuts against the outer wall surface of the air outlet pipe 233.

A third sealing element 26 is also arranged at the end of the support 23 facing away from the outlet channel, and as shown in fig. 2, 7 and 8, the third sealing element 26 abuts longitudinally against the first sealing element 242 and the lower end face of the second section 212 of the porous liquid guiding body 21. The third sealing element 26 is configured in an irregular plug shape, and includes a bottom wall and a side wall, the bottom wall and the side wall enclose to form an open cavity 261, the cavity 261 is disposed opposite to the atomizing cavity 25, a part of the wall surface of the side wall abuts against the inner wall surface of the bracket 23, a part of the wall surface is concave, the concave wall surface of the third sealing element 26 and the inner wall surface of the bracket 23 define a gas guide cavity 263, a vent hole 262 is further disposed on the side wall of the third sealing element 26, and the gas guide cavity 263 is communicated with the vent hole 262. A bottom cover 13 is provided at the lower end of the housing 12, the body portion of the third sealing member 26 is housed in the cavity of the holder 23, and the lower end surface of the third sealing member 26 abuts on the bottom cover 13. An air inlet 132 is provided in the bottom cover 13 for directing an external air flow into the interior cavity of the housing 12. Two air inlets 132 are provided on both sides of the bottom cover 13, two air vents 262 are also provided on opposite sidewalls of the third sealing member 26, two air guide cavities 263 are correspondingly defined on both sides of the third sealing member 26, and the external air flows enter the air guide cavities 263 through the air inlets 132 on both sides, further enter the air vents 262, enter the inner cavity of the bracket 23 through the cavity 261 of the third sealing member 26, and further are guided into the atomizing chamber 25. Since the cavity 261 of the third sealing member 26 is disposed opposite to the atomizing chamber 25, the cavity 261 of the third sealing member 26 can receive the condensate generated inside the atomizing chamber 25, thereby preventing the condensate from leaking to the outside.

The atomizing assembly 20 is configured to be replaceable as a core unit of the atomizer, and a user can remove the atomizing assembly 20 for replacement by removing the bottom cover 13 at the lower end of the housing 12, thereby being beneficial to prolonging the service life of the whole atomizer.

A set of electrical connectors 133 is provided on the bottom cover 13, the electrical connectors 133 being configured in the form of an electrode ring comprising an inner electrode and an outer electrode arranged in a spaced apart relationship, the inner electrode being connected to a positive conductive pin connected to the heating element and the outer electrode being connected to a negative conductive pin connected to the heating element. The positive and negative conductive pins connected to the two ends of the heating element need to pass through the third sealing element 26 to be connected to the inner and outer electrodes of the electrode ring, respectively.

Further, a barrier sheet 264 is further disposed at the bottom end of the third sealing element 26, the barrier sheet 264 extends from the bottom end of the third sealing element 26 to the direction of the inner electrode close to the electrical connector 133, a part of the wall surface of the barrier sheet 264 can be disposed close to the inner electrode, the barrier sheet 264 has various functions, on one hand, since only one insulating ring is disposed between the inner electrode and the outer electrode, the distance is relatively short, and the inner electrode is disposed in a protruding manner relative to the outer electrode, under the condition of no blocking, the negative conductive pin is easy to contact with the inner electrode to cause short circuit, and the barrier sheet is disposed, so that the negative conductive pin cannot contact with the inner electrode, and can only be attached to the wall surface of the barrier sheet 264, thereby avoiding the occurrence of short circuit. On the other hand, the barrier rib 264 also functions to guide the flow of liquid toward the peripheral region of the inner electrode due to the barrier rib 264 when a portion of the liquid overflows from the vent hole 262 of the third sealing member 26, so that no liquid flows into the inner electrode, thereby corroding the electrode assembly. Furthermore, a hollow lead post is disposed on the third sealing element 26, and the conductive pins 221 connected to the two ends of the heating element 22 penetrate through the bottom end surface of the porous conductive liquid 21, and then penetrate through the two lead posts 265 disposed on the third sealing element 26 to be electrically connected to the electrode ring. In a preferred embodiment, the top ends of the two lead posts are in contact with the bottom end face of the porous liquid guiding body 21, so that the third sealing element 26 further provides longitudinal support for the porous liquid guiding body 21.

In another embodiment provided by the present application, a ventilation channel is provided between the porous liquid guiding body 21 and the first sealing element 242 and/or the second sealing element 241, and the air flow enters the reservoir 121 through the ventilation channel so as to prevent the liquid guiding from being blocked due to the negative pressure generated inside the reservoir 121. In one example, a second ventilation channel communicated with the air outlet pipe is provided at a connection surface between the second sealing element 241 and the porous liquid guiding body 21 or a second ventilation channel communicated with the air outlet pipe is provided on the second sealing element 241.

Further, a first venting channel is provided between the second section 212 of the porous conducting liquid 21 and the first sealing element 241. The first ventilation channel may be disposed on the first sealing element 241, and the first ventilation channel may also be disposed at a connection gap between the first sealing element 241 and the second section 212 of the porous conductive liquid 21. In a preferred embodiment, the first ventilation channel comprises a recess 215 provided on the outer wall surface of the porous liquid guide 21, the recess 215 being capable of guiding the air flow to the interior of the reservoir 121. Specifically, the groove 215 is provided on the second section 212 of the porous liquid guide 21 and extends from the bottom end surface of the second section 212 of the porous liquid guide 21 to the top end surface of the second section 212, wherein the top end surface of the porous liquid guide 21 is provided near the reservoir 121. The inlet of the groove 215 communicates with the air intake channel at the bottom of the support 23, and in the example provided in the present application, the inlet of the groove 215 communicates with the cavity 261 of the third sealing element 26, so that the air flow can enter the groove 215. The outlet of the recess 215 is in communication with the drainage chamber 232 and the air flow can enter through the recess in the porous drainage body 21 and through the recess 215 into the drainage chamber 232 and into the reservoir 121. The specific location of the groove 215 is mainly determined by the sealing and fixing structure of the lower end of the porous liquid guide 21, and mainly ensures that the outlet of the groove 215 can be communicated with the liquid storage cavity 121, and the arrangement of the groove 215 cannot cause liquid leakage. If the first sealing element 242 covers a portion of the surface of the first section 211 of the porous liquid conducting body 21 in addition to the outer surface of the second section 212 of the porous liquid conducting body 21, a portion of the groove 215 is disposed on the first section 211 of the porous liquid conducting body 21 and a portion of the groove is disposed on the second section 212 of the porous liquid conducting body 21. In one example provided herein, the lower end of the porous liquid guide 21 rests primarily on the stepped surface 213 of the second section 212, and the first sealing element 242 substantially covers the side of the second section 212 of the porous liquid guide 21 as well as the stepped surface 213, such that the recess 215 extends from the bottom end surface of the second section 212 of the porous liquid guide 21 to the stepped surface 213 of the second section 212, wherein the stepped surface 213 is disposed proximate the reservoir 121. In a preferred embodiment, to facilitate the introduction of the air flow into the interior of the reservoir 121 as quickly as possible, the outlet of the recess 215 is positioned proximate to the aperture 231 in the bracket 23 such that the air flow exiting the recess 215 can enter the reservoir 121 via the aperture 231. When the first sealing element 242 completely covers the top end surface of the porous liquid guide 21, a first notch 243 is further disposed on the first sealing element 242, and the first notch 243 communicates the groove 215 with the liquid storage chamber 121. If the outlet of the groove 215 can communicate with the drainage lumen 121 when the first sealing member 242 covers only a part of the top end surface of the porous drainage body 21, the notch 243 does not need to be provided in the first sealing member 242. In order to avoid liquid leakage along the grooves 215, the grooves 215 are arranged in a zigzag extending structure, i.e. the outlet of the grooves 215 is not in line with the inlet of the grooves 215, the liquid can only flow in a zigzag manner after entering from the outlet of the grooves 215, and further flow of the liquid matrix can be hindered by a wall surface of the grooves 215. In one example thereof, the groove 215 extends generally in a zigzag fashion, or at least one of an S-shaped extension, a spiral, a dogleg, and a labyrinth extension. In further examples, the groove 215 includes a first segment groove 2151 and a second segment groove 2152, wherein the first segment groove 2151 is in communication with the air intake channel, the second segment groove 2152 is in communication with the reservoir 121, and the width of the first segment groove 2151 is less than the width of the second segment groove 2152, on one hand, enabling rapid air flow into the reservoir 121 from the wide outlet of the second segment groove 2152, and on the other hand, making it difficult for liquid to flow out through the narrow outlet of the first segment groove 2151.

When the first sealing element 242 completely covers the outlet end of the groove 215, the first ventilation channel further includes a first notch 243 disposed on the first sealing element 242, and the first notch 243 communicates the groove 215 and the liquid storage chamber 121. Referring to fig. 2, 3 and 9, in order to avoid the first sealing element 242 being assembled at a different position during the assembling process, such that the first gap 243 is staggered from the outlet end of the groove 215, a first limiting structure is further disposed on the first sealing element 242, and the first limiting structure can prevent the first sealing element 242 from being displaced relative to the porous liquid guiding body 21. Correspondingly, a first matching part matched with the first limiting structure is further arranged on the porous liquid guiding body 21, and by means of the limiting effect between the first limiting structure and the first matching part, the accurate positioning between the first sealing element 242 and the porous liquid guiding body 21 can be achieved. Specifically, the first position-limiting structure includes a fitting groove 244 provided on the first sealing element 242, the first fitting portion includes a protrusion 216 provided on the porous conductive liquid 21, and the first sealing element 242 can be assembled only when the fitting groove of the first sealing element 242 is aligned with the protrusion 216 of the porous conductive liquid 21. In order to further increase the air exchange capacity of the groove 215, two grooves 215, namely a first groove 2153 and a second groove 2154, are provided on the porous liquid guiding body 21, and two first notches 243 are provided on the first sealing element 242 to cooperate with the two grooves 215 for air exchange. Further, the first matching portion is disposed between the first groove 2153 and the second groove 2154 on the porous liquid guiding body 21, so that the two grooves 215 on the porous liquid guiding body 21 and the two first gaps 243 on the first sealing element 242 can be completely communicated in a matching manner.

Further, a plurality of matching structures with the porous liquid guiding body 21 are also provided on the third sealing element 26, such as the positions of the vent holes 262 on the third sealing element 26 and the positions of the two lead posts 265, in order to enable the third sealing element 26 to be installed according to a predetermined installation position, a second limiting structure is also provided on the third sealing element 26, and a second matching portion is provided on the bracket 23, and by means of the interaction of the second limiting structure and the second matching portion, precise positioning between the third sealing element 26 and the porous liquid guiding body 21 and the first sealing element 242 can be realized. Specifically, the second limiting structure on the third sealing element 26 includes ribs 266 disposed on two sides of the third sealing element 26, the second matching portion on the bracket 23 includes two second notches 234 disposed on the end portion of the bracket 23, and the two ribs on the third sealing element 26 can be assembled only by aligning with the two second notches 234 on the bracket 23.

Because the structure of the grooves 215 is arranged on the porous liquid guiding body 21, the porous liquid guiding body 21 can be demolded only from two sides where the two grooves 215 are located in the demolding process, and in order to facilitate smooth molding of the porous liquid guiding body 21, in the process of combining the conductive pins 221 at two ends of the heating element 22 with the ceramic liquid 21, the conductive pins 221 need to be opened at a certain angle to be smoothly inserted into the inner wall of the porous liquid guiding body 21. Therefore, the conductive pins 221 of the molded heating element 22 are disposed non-parallel to the extending direction of the axis of the porous conductive liquid 21. The specific opening angle of the conductive pins 221 can be optimally adjusted according to the injection molding process.

It should be noted that the description and drawings of the present application illustrate preferred embodiments of the present application, but are not limited to the embodiments described in the present application, and further, those skilled in the art can make modifications or changes according to the above description, and all such modifications and changes should fall within the scope of the claims appended to the present application.

Claims (29)

1. An atomizer, comprising:

a housing defining a reservoir cavity formed therein for storing a liquid substrate;

a porous liquid-conducting body configured to have a hollow tubular structure; the porous liquid guide body comprises a first section and a second section which are arranged along the longitudinal direction of the porous liquid guide body, the outer diameter of the first section is smaller than that of the second section, and a step surface is formed by transition between the second section and the first section;

a heating element affixed to the porous liquid conducting body for atomizing the liquid matrix;

the bracket is provided with an accommodating cavity, the porous liquid guide is accommodated in the accommodating cavity, and holes are formed in the bracket and used for guiding the liquid matrix to enter the accommodating cavity so as to be absorbed by the porous liquid guide; and

a first sealing element, at least a portion of the first sealing element surrounding an outer side surface of the second section to provide a seal between an inner wall surface of the receiving cavity and the outer side surface of the second section.

2. The atomizer according to claim 1, wherein said heating element is disposed along a longitudinal extent of said porous liquid-conducting body and said heating element is confined to extend within a longitudinal extent of said first section of porous liquid-conducting body.

3. The atomizer of claim 1, further comprising a second sealing element at least partially surrounding an outer side surface of an end of said first segment facing away from said second segment.

4. The nebulizer of claim 3, wherein a portion of the outer wall surface of the porous liquid guide that is not surrounded by the first sealing member and the second sealing member defines a liquid guide chamber with an inner wall surface of the holder, and the liquid medium inside the reservoir chamber can enter the liquid guide chamber through the hole.

5. The atomizer of claim 1, wherein said first section has a wall thickness less than a wall thickness of said second section.

6. A nebuliser as claimed in claim 5, wherein the wall thickness of the first section is in the range 0.5mm to 1.2mm and the wall thickness of the second section is in the range 1.2mm to 3 mm.

7. The nebulizer of claim 1, wherein the receiving chamber of the holder comprises a first portion and a second portion, the first portion having an inner diameter smaller than an inner diameter of the second portion, the first portion of the receiving chamber configured to receive the first section of the porous conducting liquid, the second portion of the receiving chamber configured to receive the second section of the porous conducting liquid.

8. The nebulizer of claim 1, wherein the first sealing element and the porous conducting liquid form a first air venting channel therebetween for directing an external air flow to the reservoir chamber.

9. The nebulizer of claim 8, wherein the first vent passage comprises at least one groove extending on an outer surface of the second section of the porous liquid conducting body, the groove communicating with the reservoir chamber.

10. The nebulizer of claim 9, wherein the recess extends from a bottom end face of the second section to the step face, wherein the step face is proximate the reservoir chamber.

11. The atomizer of claim 10, wherein said grooves extend non-linearly in a longitudinal direction.

12. A nebulizer as claimed in claim 11, wherein the recess extends substantially in a zigzag or S-shape.

13. The nebulizer of claim 10, 11 or 12, wherein the recess comprises a first section of recess and a second section of recess in communication with each other, the second section of recess having a width greater than a width of the first section of recess, the second section of recess being in communication with the reservoir chamber.

14. The nebulizer of claim 10, further comprising a second sealing element, wherein the first vent passage further comprises a first notch disposed on the second sealing element, the first notch communicating the recess with the reservoir chamber.

15. The nebulizer of claim 8, wherein the first venting channel longitudinally corresponds to a location of the aperture in the holder when the porous liquid guide and first sealing element are received in the receiving chamber.

16. The nebulizer of claim 15, wherein a first stop structure is provided on the first sealing element for providing a stop to prevent rotation of the porous liquid conducting body relative to the first sealing element.

17. The atomizer according to claim 16, further comprising a first engagement portion disposed on said porous liquid conducting body for mating with said first retention structure, said first engagement portion projecting from said step surface.

18. The nebulizer of claim 1, further comprising a third sealing element at least partially housed within the holder, the third sealing element longitudinally abutting the porous liquid conducting body.

19. The nebulizer of claim 18, wherein the third sealing element further comprises a second stop portion for engaging the holder to prevent rotation of the third sealing element relative to the holder.

20. The atomizer of claim 19, wherein said bracket defines a second engagement portion that mates with said second retention portion, said second engagement portion including a second notch.

21. The atomizer of claim 18, wherein said third sealing member comprises a cavity adjacent an end face of said second section, said cavity for receiving condensate.

22. The atomizer of claim 18, further comprising an electrical connector in electrical communication with said heating element, a barrier disc being disposed on said third sealing member, said barrier disc extending from an end of said third sealing member toward said electrical connector.

23. A nebulizer as claimed in claim 18, wherein the third sealing element is provided with a vent.

24. The atomizer of claim 23, wherein at least a portion of said third sealing member is recessed laterally such that an air-conducting chamber is formed between said third sealing member and an inner wall of said support, said air-conducting chamber being in communication with said air-conducting aperture.

25. The atomizer of claim 1, wherein conductive pins are connected to both ends of said heating element, said conductive pins extending from the interior of said porous liquid; wherein, the extending direction of the conductive pin is arranged in a non-parallel way with the axis of the porous liquid guide body.

26. The atomizer of claim 1, wherein said first sealing member includes a sleeve portion and a radial extension, said radial extension covering said step surface.

27. A ceramic heating body for an aerosol-generating device comprising a porous liquid conducting body for storing and delivering a liquid substrate and a heating element bonded to the porous liquid conducting body, the porous liquid conducting body being configured to have a hollow tubular structure, the porous liquid conducting body comprising a first section and a second section arranged longitudinally, the first section having an outer diameter smaller than the second section, the transition between the second section and the first section forming a step surface; the heating element is used to atomize the liquid matrix.

28. The ceramic heating body as claimed in claim 27, wherein at least one groove is provided on the porous liquid-conducting outer wall.

29. An aerosol-generating device comprising a nebuliser according to any one of claims 1 to 26, and a power supply assembly for providing electrical drive to the nebuliser.

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