CN219845053U - Air heater and aerosol generating device - Google Patents

Abstract

The utility model discloses an air heater and an aerosol generating device, wherein the air heater comprises: an air flow channel for air circulation is arranged in the outer shell, and two ends of the air flow channel are respectively communicated with the outside; the conductive ceramic heating body is at least partially arranged in the airflow channel, a space exists between the outer wall of the conductive ceramic heating body and the inner wall of the outer shell, and a positive contact and a negative contact for connecting electrode pins are arranged on the conductive ceramic heating body at intervals; at least one heat conductor, the radial both ends of heat conductor along electrically conductive ceramic heat-generating body are connected with the lateral wall of electrically conductive ceramic heat-generating body, the inner wall of shell body respectively, and the axial both ends of heat conductor along electrically conductive ceramic heat-generating body extend along the axial of electrically conductive ceramic heat-generating body and set up, and the heat conductor is used for giving off the heat that electrically conductive ceramic heat-generating body produced to with the gas heating that flows through the air current passageway becomes the hot air current. The air heater can improve the service life and the temperature control precision of the aerosol generating device.

Description

Air heater and aerosol generating device

Technical Field

The utility model relates to the technical field of electronic atomization, in particular to an air heater and an aerosol generating device.

Background

The aerosol generating devices on the market at present mainly comprise two types, namely an electronic atomization device for forming the smokable aerosol by evaporating an atomized liquid and a heating non-combustion device for forming the smokable aerosol by heating herbal products (such as low-temperature non-combustion cigarettes) at a temperature of 200-400 ℃. Compared with the traditional combustion type cigarette, the harmful components in aerosol generated by the electronic atomization device and the heating non-combustion device are far lower than those of the traditional combustion type cigarette, so that the adverse effect of the traditional cigarette on human body can be greatly reduced by using the electronic atomization device or the heating non-combustion device.

The heating means of the heating non-combustion device is generally divided into contact heating and non-contact heating, wherein the most common non-contact heating means is air heating, that is, heating air to form hot air, and then introducing the hot air into the herbal product to realize heating and atomization of the herbal product, so as to generate aerosol which can be pumped by a user.

The existing air heater for forming hot air is mostly a ceramic body with a metal heating resistor as a heating source, namely, the metal heating resistor (such as a metal heating wire, a metal heating film and the like) is attached to the inner wall of a hollow ceramic body, and when in operation, the air flowing through the cavity inside the ceramic body is heated by utilizing the heat generated by the metal heating resistor, so that the hot air for heating herbal products is formed. However, such a structural form of the air heater has the following disadvantages in general:

the air heater using the metal heating resistor as a heating source needs to heat the inner wall of the ceramic body after the metal heating resistor is electrified, heat is radiated outwards to heat air flowing through the ceramic body, and heat is transmitted in a conduction process from the metal heating resistor to the ceramic body, so that heat loss is more, the metal heating resistor is often required to be lifted to a higher working temperature to heat the air to a required temperature, for example, in order to obtain hot air with the temperature of 300 ℃, the working temperature of the metal heating resistor is usually required to reach more than 400 ℃, however, the higher the working temperature of the metal heating resistor is, the more easily oxidized the metal heating resistor is, the service life of the metal heating resistor is shortened after the metal resistor is oxidized, the stability of TCR (Temperature Coefficient of Resistance) is deteriorated due to the fact that the resistance value of the metal resistor is changed greatly, and the temperature control function of the air heater is not facilitated, and therefore the service life of the air heater is shortened, and the temperature control precision of the air heater is reduced.

Disclosure of Invention

The utility model mainly aims to provide an air heater and an aerosol generating device, and aims to improve the service life and temperature control precision of the aerosol generating device.

To achieve the above object, the present utility model provides an air heater comprising:

the device comprises an outer shell, wherein an air flow channel for circulating air is arranged in the outer shell, and two ends of the air flow channel are respectively communicated with the outside;

the conductive ceramic heating body is at least partially arranged in the airflow channel, a space exists between the outer wall of the conductive ceramic heating body and the inner wall of the outer shell, and a positive electrode contact and a negative electrode contact for connecting electrode wire pins are arranged on the conductive ceramic heating body at intervals; and

the heat conductor is connected with the outer side wall of the conductive ceramic heating element and the inner wall of the outer shell respectively along the two radial ends of the conductive ceramic heating element, the heat conductor is arranged along the two axial ends of the conductive ceramic heating element in an extending manner along the axial direction of the conductive ceramic heating element, and the heat conductor is used for radiating heat generated by the conductive ceramic heating element so as to heat gas flowing through the airflow channel into hot air.

Further, the conductive ceramic heating body is in a column shape, a plurality of heat conductors are arranged, and the plurality of heat conductors are arranged at intervals along the circumferential direction of the conductive ceramic heating body and divide the airflow channel into a plurality of sub-channels.

Further, the outer shell surrounds the conductive ceramic heating body, two adjacent heat conductors are spaced to form one sub-channel, and the two adjacent sub-channels are mutually isolated in the outer shell along the circumferential direction of the conductive ceramic heating body.

Further, the plurality of heat conductors are uniformly arranged at intervals along the circumferential direction of the conductive ceramic heating body, and along the axial direction of the conductive ceramic heating body, one end face of each heat conductor is flush with one end face of the outer shell, and the other end face of each heat conductor is flush with the other end face of the outer shell.

Further, the positive electrode contact and the negative electrode contact are arranged at intervals along the axial direction of the conductive ceramic heating body, and each heat conductor is positioned between the positive electrode contact and the negative electrode contact along the axial direction of the conductive ceramic heating body.

Further, the air heater further comprises a positive terminal pin and a negative terminal pin, wherein the positive terminal pin is electrically connected with the positive contact, and the negative terminal pin is electrically connected with the negative contact.

Further, a first metal coating and a second metal coating are further arranged on the conductive ceramic heating body, the first metal coating covers the positive electrode contact and is welded with the positive electrode wire leg, and the second metal coating covers the negative electrode contact and is welded with the negative electrode wire leg.

Further, the material of the outer shell comprises any one of Teflon, glass fiber and compact insulating ceramic.

Further, the material of the heat conductor comprises any one of metal, insulating ceramic and conductive ceramic.

Further, the heat conductor has a plate shape.

Further, the heat conductor is connected with the conductive ceramic heating element in an integrated manner.

In order to achieve the above object, the present utility model further provides an aerosol generating device, which includes a battery assembly and the air heater, wherein the battery assembly is electrically connected with the positive electrode contact and the negative electrode contact, respectively.

Compared with the prior art, the utility model has the beneficial effects that:

in the technical scheme of the utility model, the conductive ceramic heating element is used as a heating source, heat generated after the conductive ceramic heating element is electrified can be transferred to the heat conductor for heat dissipation, when external gas flows through the airflow channel in the outer shell, the external gas can be heated by the conductive ceramic heating element in the airflow channel and the heat emitted by the heat conductor to form hot air flow, compared with the traditional air heater taking the metal heating resistor as the heating source, the air heater provided by the utility model adopts the conductive ceramic heating element made of the conductive ceramic material as the heating source, and compared with the metal material, the conductive ceramic material has better high temperature resistance and oxidation resistance, and better stability of the resistance temperature coefficient, so that the air heater provided by the utility model has longer service life and higher temperature control precision, thereby effectively improving the service life and the temperature control precision of the aerosol generating device.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of an air heater according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of an air heater according to an embodiment of the present utility model;

FIG. 3 is a bottom view of FIG. 1 with the negative terminal pin removed;

FIG. 4 is a schematic view of the structure of FIG. 1 with the outer shell and the anode and cathode wire legs removed;

FIG. 5 is a schematic diagram of an aerosol generating device according to an embodiment of the present utility model;

fig. 6 is a schematic diagram of an aerosol generating device according to an embodiment of the utility model.

Reference numerals illustrate:

1-an outer housing, 11-an air flow channel, 111-a sub-channel;

2-a conductive ceramic heating element;

3-a heat conductor;

41-positive electrode contact, 42-negative electrode contact;

5-positive electrode terminal pins;

6-negative electrode terminal;

71-a first metal coating, 72-a second metal coating;

8-cell assembly;

9-a mounting shell, 91-a containing cavity and 92-an air inlet hole;

10-herbal preparation.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is included in the embodiment of the present utility model, the directional indication is merely used to explain a relative positional relationship, a movement condition, and the like between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, when an element is referred to as being "fixed to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or", "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B ", including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1 to 4, an embodiment of the present utility model provides an air heater including an outer case 1, an electrically conductive ceramic heating body 2, and at least one heat conductor 3, wherein:

an air flow channel 11 through which air flows is arranged in the outer shell 1, and two ends of the air flow channel 11 are respectively communicated with the outside, namely, an air inlet end and an air outlet end of the air flow channel 11 are respectively communicated with the outside;

the conductive ceramic heating body 2 is at least partially arranged in the airflow channel 11, a space exists between the outer wall of the conductive ceramic heating body 2 and the inner wall of the outer shell 1, and a positive electrode contact 41 and a negative electrode contact 42 for connecting electrode pins are arranged on the conductive ceramic heating body 2 at intervals;

the heat conductor 3 is connected with the outer side wall of the conductive ceramic heating element 2 and the inner wall of the outer shell 1 along the radial two ends of the conductive ceramic heating element 2 respectively, the heat conductor 3 is arranged along the axial extension of the conductive ceramic heating element 2 along the two ends of the conductive ceramic heating element 2 (i.e. the upper end of the heat conductor 3 is arranged along the axial upward extension of the conductive ceramic heating element 2, the lower end of the heat conductor 3 is arranged along the axial downward extension of the conductive ceramic heating element 2), and the heat conductor 3 is used for radiating heat generated by the conductive ceramic heating element 2 so as to heat gas flowing through the gas flow channel 11 into hot gas flow.

In this embodiment, both the positive electrode contact 41 and the negative electrode contact 42 on the conductive ceramic heating element 2 may be used to connect electrode pins (specifically, the electrode pins may be metal wires), referring to fig. 1-3 and fig. 5, in some application scenarios in which the air heater of this embodiment is applied to an aerosol generating device, the positive electrode contact 41 on the conductive ceramic heating element 2 may be electrically connected to the positive electrode of the battery assembly 8 of the aerosol generating device through one electrode pin, and the negative electrode contact 42 may be electrically connected to the negative electrode of the battery assembly 8 of the aerosol generating device through one electrode pin, and the battery assembly 8 of the aerosol generating device is used to supply power to the conductive ceramic heating element 2, so that the conductive ceramic heating element 2 may be electrified and heated.

In this embodiment, in implementation, the material of the outer casing 1 may be preferably an insulating and high-temperature resistant material such as teflon, glass fiber, and dense insulating ceramic, which is beneficial to reducing the risk of short circuit or electric leakage of the air heater during the power-on working process, and reducing the risk of damage of the air heater due to phenomena such as melting and cracking during the air heating process, thereby being beneficial to prolonging the service life of the air heater.

In the present embodiment, the specific material of the conductive ceramic heat generating body 2 may be dense conductive ceramic or porous conductive ceramic having pores in the specific implementation, and the present embodiment is not particularly limited thereto. It will be appreciated that the difference between the dense conductive ceramic and the porous conductive ceramic is that the former is a dense structure without pores, and the latter is a porous structure with pores, and this difference is caused by the different molding processes, and the molding processes of the dense conductive ceramic and the porous conductive ceramic are mature processes in the art, and will not be repeated here.

In this embodiment, in the implementation, the material of the heat conductor 3 may be a metal, for example, a metal material such as silver, copper, aluminum alloy, or stainless steel, the material of the heat conductor 3 may also be an insulating ceramic material such as alumina ceramic, aluminum nitride ceramic, silicon carbide ceramic, or silicon nitride ceramic, and the material of the heat conductor 3 may also be an electrically conductive ceramic, for example, a porous electrically conductive ceramic or a dense electrically conductive ceramic, and of course, the specific material of the heat conductor 3 may also be other materials with good heat conductivity, so long as the use requirement of dissipating heat generated by the electric conduction and heating of the electrically conductive ceramic heating element 2 can be satisfied. In practical application, the material of the heat conductor 3 may be preferably insulating ceramic or conductive ceramic, because compared with metal material, air heated by the insulating ceramic or conductive ceramic will not be attached with metal odor, thereby being beneficial to improving the suction taste of the user.

In the present embodiment, it is understood that the radial direction of the conductive ceramic heat generating body 2 and the axial direction of the conductive ceramic heat generating body 2 are perpendicular to each other, wherein the axial direction of the conductive ceramic heat generating body 2 is understood as the longitudinal direction of the conductive ceramic heat generating body 2 (i.e., the up-down direction as shown in fig. 1, 2 and 4).

In the technical scheme of the embodiment, the conductive ceramic heating body 2 is adopted as a heating source, heat generated after the conductive ceramic heating body 2 is electrified can be transferred to the heat conductor 3 for heat dissipation, when external air flows through the air flow channel 11 positioned in the outer shell 1, the external air can be heated by the conductive ceramic heating body 2 positioned in the air flow channel 11 and the heat emitted by the heat conductor 3 to form hot air flow, compared with the traditional air heater taking a metal heating resistor as the heating source, the air heater provided by the utility model has better high temperature resistance and oxidation resistance and better stability of resistance temperature coefficient compared with the metal material because the conductive ceramic heating body 2 made of the conductive ceramic material is adopted as the heating source.

Further, referring to fig. 1 to 4, in an exemplary embodiment of the present utility model, the conductive ceramic heat generating body 2 is in the shape of a column, the plurality of heat conductors 3 are provided, and the plurality of heat conductors 3 are arranged at intervals along the circumferential direction of the conductive ceramic heat generating body 2 and divide the air flow passage 11 into a plurality of sub-passages 111. By doing so, the contact area between the gas in the gas flow channel 11 and the heat conductor 3 can be increased, so that the heating efficiency of the air heater can be advantageously improved, that is, the gas flowing through the gas flow channel 11 can be heated to a desired temperature with lower operating power (or power consumption), for example, assuming that 400W is required for heating the gas flowing through the gas flow channel 11 to 200 ℃ when the number of the heat conductors 3 is one, the air heater can heat the gas flowing through the gas flow channel 11 to 200 ℃ with only 300W or even lower operating power when the number of the heat conductors 3 is two or more. In particular, in order to facilitate the processing and manufacturing of the heat conductors 3, each of the heat conductors 3 may have a plate shape, and for example, the heat conductors 3 may be configured to have a rectangular plate-like structure, a square plate-like structure, or the like. In the embodiment, the shape of the conductive ceramic heating element 2 may be a regular columnar structure, for example, a columnar or prismatic structure (such as a triangular prism, a quadrangular prism, a pentagonal prism, etc.), or an irregular substantially columnar structure, and this embodiment is not particularly limited, and it is understood that a columnar shape refers to a form in which a single body can be elongated in one direction.

Further, referring to fig. 1-4, in an exemplary embodiment of the present utility model, the outer casing 1 is disposed around the conductive ceramic heating element 2 (illustratively, the outer casing 1 is a hollow cylindrical structure), two adjacent heat conductors 3 are spaced apart to form a sub-channel 111, and the two adjacent sub-channels 111 are isolated from each other in the outer casing 1 along the circumferential direction of the conductive ceramic heating element 2. In this way, by isolating each sub-channel 111 in the outer casing 1 from each other through the heat conductor 3, it is possible to avoid the formation of vortex caused by the mutual interference of the air flows in each sub-channel 111, and further it is possible to avoid that the partially heated air stays in the outer casing 1 due to the formation of vortex and cannot be normally led out of the outer casing 1, that is, the hot air flow formed in each sub-channel 111 can be smoothly led out of the outer casing 1, thereby being beneficial to improving the utilization rate of the hot air flow.

Further, referring to fig. 1-4 and fig. 6, in an exemplary embodiment of the utility model, a plurality of heat conductors 3 are uniformly spaced along the circumferential direction of the conductive ceramic heating element 2, and along the axial direction of the conductive ceramic heating element 2, one end face of each heat conductor 3 is flush with one end face of the outer housing 1, and the other end face of each heat conductor 3 is flush with the other end face of the outer housing 1. By the arrangement, the heating space of each sub-channel 111 can be made to be the same, and the temperature of the hot air generated after the air flows through each sub-channel 111 for heating is made to be the same.

It should be noted that the herbal product 10 may be a low-temperature non-combustible cigarette, or may be other types of aerosol-generating products, such as tobacco leaves, tobacco shreds, etc., which may be determined according to the actual use requirements of the user, and this embodiment is not limited in particular. The low-temperature non-combustible cigarette mainly refers to an aerosol-generating product made of materials such as cut tobacco, tobacco particles, plant fragments, tobacco essence, propylene glycol and the like, the aerosol-generating product is generally cylindrical (such as column-shaped), and volatile substances such as nicotine and other aromatic substances in the aerosol-generating product can volatilize under the condition of low-temperature heating without generating solid particles, and only atomized aerosol is generated. It is understood that low temperature herein refers to a temperature that enables the herbal product to produce an aerosol without burning, typically 200-400 ℃.

Further, in some alternative embodiments, the connection between the heat conductor 3 and the conductive ceramic heating element 2 may be an integral connection, for example, in a specific implementation, the heat conductor 3 and the conductive ceramic heating element 2 may be integrally formed by sintering through a mold, which is beneficial to reducing the manufacturing cost of the air heater.

Further, in some optional embodiments, the heat conductor 3 may be integrally connected with the conductive ceramic heating element 2 and the outer casing 1, for example, in specific implementation, the material of the outer casing 1 may be compact insulating ceramic, the material of the heat conductor 3 may be insulating ceramic or conductive ceramic, and then the three parts of the heat conductor 3, the conductive ceramic heating element 2 and the outer casing 1 are integrally sintered by a mold, which is beneficial to further reducing the manufacturing cost of the air heater.

Further, referring to fig. 1 to 4, in an exemplary embodiment of the present utility model, the positive electrode contact 41 and the negative electrode contact 42 are arranged at intervals in the axial direction of the conductive ceramic heat-generating body 2, and each heat conductor 3 is located between the positive electrode contact 41 and the negative electrode contact 42 in the axial direction of the conductive ceramic heat-generating body 2. So set up, after anodal contact 41 and negative pole contact 42 switch on the power, the electric current can fully flow through the position that is connected with heat conductor 3 in the electrically conductive ceramic heat-generating body 2 to make heat conductor 3 give off the heat that the electrically conductive ceramic heat-generating body 2 produced better, when the installation electrode terminal pin moreover, can reduce the installation hindrance of heat conductor 3 to the electrode terminal pin, make the electrode terminal pin can more conveniently carry out the electricity with the positive and negative pole contact on the electrically conductive ceramic heat-generating body 2 and be connected. In the embodiment, the positive electrode contact 41 and the negative electrode contact 42 may be disposed on the peripheral side wall of the conductive ceramic heating element 2 or may be disposed on the end surface of the conductive ceramic heating element 2, which is not particularly limited in this embodiment, and the positive electrode contact 41 is illustratively disposed on one end surface of the conductive ceramic heating element 2 and the negative electrode contact 42 is disposed on the other end surface of the conductive ceramic heating element 2, which is advantageous for further improving the connection convenience between the electrode terminal and the positive and negative electrode contacts.

Further, referring to fig. 1-5, in an exemplary embodiment of the present utility model, the air heater further includes a positive terminal pin 5 and a negative terminal pin 6, the positive terminal pin 5 being electrically connected to the positive contact 41, the negative terminal pin 6 being electrically connected to the negative contact 42. Thus, by providing the anode and cathode terminal pins, when the air heater of the present embodiment is applied to an aerosol generating device, it is convenient to electrically connect the anode and cathode contacts on the conductive ceramic heating element 2 with the anode and cathode of the battery assembly 8 in the aerosol generating device, respectively. In the embodiment, the positive electrode terminal 5 and the negative electrode terminal 6 may be metal wires, which may be electrically connected to the conductive ceramic heating element 2 by welding or the like, and at this time, a connection portion between the positive electrode terminal 5 and the conductive ceramic heating element 2 may be regarded as a positive electrode contact 41, and a connection portion between the negative electrode terminal 6 and the conductive ceramic heating element 2 may be regarded as a negative electrode contact 42.

Further, referring to fig. 1 to 4, in an exemplary embodiment of the present utility model, the conductive ceramic heating body 2 is further provided with a first metal coating 71 and a second metal coating 72, wherein the first metal coating 71 covers the positive electrode contact 41 and is welded with the positive electrode terminal pin 5, and the second metal coating 72 covers the negative electrode contact 42 and is welded with the negative electrode terminal pin 6. In particular, the materials of the first metal coating 71 and the second metal coating 72 may be metal materials having good conductive properties such as gold, silver, copper, aluminum, silver alloy, aluminum alloy, copper alloy, and the like. In the technical scheme of the embodiment, through additionally arranging the metal coating, on one hand, the positive and negative electrode wire feet and the positive and negative electrode contacts can be electrically connected conveniently, and on the other hand, the reliability of the electrical connection between the positive and negative electrode wire feet and the conductive ceramic heating body 2 can be improved.

Correspondingly, referring to fig. 1-6, the embodiment of the present utility model further provides an aerosol generating device, which includes a battery assembly 8 and an air heater in any of the foregoing embodiments, where the battery assembly 8 is electrically connected to the positive contact 41 and the negative contact 42, respectively, and the battery assembly 8 is used to provide electric energy for the conductive ceramic heating element 2, so that the conductive ceramic heating element 2 is electrified to generate heat. In some more specific application scenarios, the aerosol generating device further comprises a mounting housing 9, the power supply component and the air heater are both arranged in the mounting housing 9, an air inlet 92 communicated with the outside is arranged on the outer side wall of the mounting housing 9, the air inlet 92 is communicated with the air inlet end of the air flow channel 11 in the air heater, a containing cavity 91 capable of containing herbal products 10 is arranged in one end of the mounting housing 9, the containing cavity 91 is communicated with the air outlet end of the air flow channel 11 in the air heater, the power supply component particularly comprises a power supply and a control circuit board, the power supply can be a battery of a lithium battery or the like, the positive electrode of the power supply is electrically connected with the positive electrode contact 41 on the conductive ceramic heating body 2 through the control circuit board, the negative pole of the power supply is electrically connected with the negative pole contact 42 on the conductive ceramic heating body 2 through the control circuit board, the control circuit board is used for controlling the work of the conductive ceramic heating body 2, after the herbal product 10 is placed in the accommodating cavity 91, the power supply can be controlled to supply power to the conductive ceramic heating body 2 through the control circuit board, so that the conductive ceramic heating body 2 is electrified and heats, when a user bites the end part of the herbal product 10 to suck, external air flows into the airflow channel 11 in the outer shell 1 from the air inlet hole 92 of the mounting shell 9 and is heated by heat emitted by the conductive ceramic heating body 2 and the heat conductor 3 to form hot airflow, and the hot airflow is led out from the air outlet end of the airflow channel 11 to the accommodating cavity 91, so that the herbal product 10 in the accommodating cavity 91 is heated and atomized to generate aerosol for the user to suck.

In this embodiment, the aerosol generating device of this embodiment has the same technical effects as the air heater due to the improvement of the air heater, and will not be described here again.

It should be noted that, other contents of the air heater and the aerosol generating device disclosed in the present utility model may be referred to the prior art, and will not be described herein.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims (10)

1. An air heater, comprising:

the device comprises an outer shell, wherein an air flow channel for circulating air is arranged in the outer shell, and two ends of the air flow channel are respectively communicated with the outside;

the conductive ceramic heating body is at least partially arranged in the airflow channel, a space exists between the outer wall of the conductive ceramic heating body and the inner wall of the outer shell, and a positive electrode contact and a negative electrode contact for connecting electrode wire pins are arranged on the conductive ceramic heating body at intervals; and

the heat conductor is connected with the outer side wall of the conductive ceramic heating element and the inner wall of the outer shell respectively along the two radial ends of the conductive ceramic heating element, the heat conductor is arranged along the two axial ends of the conductive ceramic heating element in an extending manner along the axial direction of the conductive ceramic heating element, and the heat conductor is used for radiating heat generated by the conductive ceramic heating element so as to heat gas flowing through the airflow channel into hot air.

2. An air heater according to claim 1, wherein said conductive ceramic heating element is in the form of a column, said plurality of heat conductors are provided in plural, and said plurality of heat conductors are arranged at intervals along the circumferential direction of said conductive ceramic heating element and divide said air flow passage into a plurality of sub-passages.

3. An air heater according to claim 2, wherein said outer housing is disposed around said conductive ceramic heat-generating body, adjacent ones of said heat conductors being spaced apart to form one of said sub-passages, and adjacent ones of said sub-passages being disposed within said outer housing in isolation from one another along a circumference of said conductive ceramic heat-generating body.

4. An air heater according to claim 3, wherein a plurality of said heat conductors are arranged at regular intervals in the circumferential direction of said conductive ceramic heat generating body, and in the axial direction of said conductive ceramic heat generating body, one end face of each said heat conductor is flush with one end face of said outer case, and the other end face of each said heat conductor is flush with the other end face of said outer case.

5. An air heater according to any one of claims 1 to 4, wherein said positive electrode contact and said negative electrode contact are arranged at intervals in an axial direction of said conductive ceramic heating element, and each of said heat conductors is located between said positive electrode contact and said negative electrode contact in an axial direction of said conductive ceramic heating element.

6. The air heater of claim 5, further comprising a positive terminal pin electrically connected to the positive contact and a negative terminal pin electrically connected to the negative contact.

7. An air heater according to claim 6, wherein said conductive ceramic heater further has a first metal coating and a second metal coating disposed thereon, said first metal coating covering said positive contact and being welded to said positive terminal pin, said second metal coating covering said negative contact and being welded to said negative terminal pin.

8. The air heater of any one of claims 1-4, wherein the material of the outer housing comprises any one of teflon, fiberglass, dense insulating ceramic;

and/or the material of the heat conductor comprises any one of metal, insulating ceramic and conductive ceramic.

9. An air heater according to any one of claims 1 to 4, wherein the heat conductor is plate-like;

and/or the heat conductor and the conductive ceramic heating body are connected into a whole.

10. An aerosol generating device comprising a battery assembly and an air heater according to any one of claims 1 to 9, the battery assembly being electrically connected to the positive and negative contacts, respectively.