CN116602450A

CN116602450A - Aerosol generating device

Info

Publication number: CN116602450A
Application number: CN202310648766.XA
Authority: CN
Inventors: 崔元昊; 李思文; 符小松; 何家基; 唐志强
Original assignee: Shenzhen Huabao Collaborative Innovation Technology Research Institute Co ltd
Current assignee: Shenzhen Huabao Collaborative Innovation Technology Research Institute Co ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-08-18

Abstract

The application provides an aerosol generating device, and belongs to the field of novel electric heating cigarettes. The aerosol generating device comprises a shell and a heat conduction component, wherein an air inlet and a containing cavity for containing an aerosol generating product are formed in the shell, the containing cavity is communicated with the air inlet, a tubular heat insulation piece is arranged in the shell, the heat conduction component is arranged in the heat insulation piece and is arranged at intervals with the heat insulation piece, one end of the heat conduction component, which is located in the containing cavity, is used for electrically heating the aerosol generating product, a preheating area is formed between the heat conduction component and the inner surface of the heat insulation piece, an air inlet window is formed in the side surface of the heat conduction component, and the preheating area is communicated with the air inlet window so that air passes through the heat conduction component and is sucked into the containing cavity. The aerosol generating device can rapidly heat air to the temperature required by the aerosol generating product, so that the full utilization of heat energy is realized, the overall heat conversion efficiency is high, the heating power of the heat conduction component is low, and the service life of the heat conduction component is prolonged.

Description

Aerosol generating device

Technical Field

The application belongs to the field of novel electric heating cigarettes, and particularly relates to an aerosol generating device.

Background

The low temperature heating non-combustible aerosol generating device heats tobacco products to form a smokable aerosol by low temperature heating at 200 ℃ -400 ℃. Because of low working temperature, the content of harmful components in aerosol formed by the aerosol generating device is relatively low, which is more beneficial to ensuring the personal health of users and is popular among the public. Currently, the heating means of low temperature non-combustion aerosol-generating devices generally include contact heating and non-contact heating. The non-contact heating means that the air heating mode is adopted, the air heating non-combustion technology is that the heating component is utilized to heat the sucked cold air, and the heated hot air is used for steaming tobacco products, namely, the tobacco products are directly heated but not burnt to generate smoke. It can not only realize the satisfaction similar to the cigarette, but also reduce the generation and inhalation of harmful substances in the combustion process.

The heat conductor in the existing aerosol-generating device adopts bottom air intake. Air enters the heat conducting body through the bottom of the heat conducting body and is heated by the heat conducting body, wherein the heated air carries out steaming heating on tobacco products, and therefore hot melt adhesive is produced.

The bottom inlet approach suffers from the following drawbacks: the air entering the heat conductor is not completely heated to the temperature required by the baking of the tobacco branch by the heat conductor, so that the tobacco product is steamed and heated, and the taste is poor. The existing solution is to continuously operate the heat conductor at a higher working temperature by increasing the heating power of the heat conductor, thereby increasing the temperature of the air inside the heat conductor, but this results in problems of shortened service life and poor stability of the heat conductor.

Disclosure of Invention

The present application aims to overcome the drawbacks of the prior art and to provide an aerosol-generating device for solving the problems of the prior art.

To solve the above problems, an embodiment of the present application provides an aerosol-generating device, including a housing and a heat-conducting component, wherein an air inlet and a receiving cavity for receiving an aerosol-generating product are provided on the housing, the receiving cavity is communicated with the air inlet, a tubular heat-insulating member is provided in the housing, the heat-conducting component is provided in the heat-insulating member and is spaced from the heat-insulating member, the heat-conducting component is located at one end of the receiving cavity for electrically heating the aerosol-generating product, a preheating area is formed between the heat-conducting component and an inner surface of the heat-insulating member, an air inlet window is provided on a side surface of the heat-conducting component, and the preheating area is communicated with the air inlet window so that air is pumped into the receiving cavity through the heat-conducting component.

In one possible implementation manner, the preheating zone includes a first preheating zone and a second preheating zone, the first preheating zone is disposed along the inner surface of the heat insulating member, the second preheating zone is disposed on the outer surface of the heat conducting component, and the first preheating zone is communicated with the second preheating zone.

In one possible implementation manner, the heat conducting component is provided with an upper heat conducting piece and a lower heat conducting piece, the air inlet window is arranged between the upper heat conducting piece and the lower heat conducting piece, and the second preheating zone is a space which is concavely arranged on the heat conducting component and is adjacent to the air inlet window.

In a possible embodiment, the heat conducting assembly is connected to a fixture located inside the heat insulating member, the fixture forming at least part of the receiving cavity, at least part of the first preheating zone being formed between the fixture and the heat insulating member.

In one possible implementation manner, the fixing piece comprises a first fixing piece and a second fixing piece, and the second fixing piece is provided with a slot hole, and the slot hole is at least partially overlapped or not overlapped with the projection position of the air inlet window.

In one possible embodiment, the end of the lower heat conducting piece, which is far away from the first stator piece, is further provided with a heat storage cavity, and the heat storage cavity, the air inlet and the preheating zone are communicated.

In one possible implementation manner, the second stator piece is a tubular main body, and the slot hole is hollowed out on the tubular main body.

In a possible embodiment, the space of the second preheating zone is at least partially surrounded by the heat conducting assembly and the second stator piece.

In one possible embodiment, the heat insulating member is disposed between the inside of the housing to form an air inlet passage, and the air inlet passage is communicated with the air inlet.

In one possible embodiment, the inlet duct communicates with the preheating zone such that air flows from the air inlet into and through to the receiving chamber.

The aerosol generating device comprises a shell and a heat conduction component, wherein a tubular heat insulation member is arranged in the shell, and the heat conduction component is arranged in the heat insulation member and is arranged at intervals with the heat insulation member.

When the aerosol generating device works, the heat conducting component is electrified to generate heat, and part of heat on the heat conducting component can be transferred to the preheating zone. In the sucking process, air sequentially flows through the preheating zone and the air inlet window through the air inlet to enter the heat conducting assembly and finally flows into the accommodating cavity, in the process, the preheating zone preheats the air, and then the preheated air is heated again through the heat conducting assembly, so that the air flowing into the accommodating cavity rapidly rises and reaches the temperature required for baking the aerosol generating product. Because the heat conduction component is arranged in the heat insulation piece, heat generated by the heat conduction component can be gathered in the heat insulation piece more, so that heat loss can be effectively reduced, and full utilization of heat energy is realized.

The aerosol generating device can rapidly heat air to the temperature required by the aerosol generating product, so that the full utilization of heat energy is realized, the overall heat conversion efficiency is high, the heating power of the heat conduction component is low, and the service life of the heat conduction component is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic view of an aerosol-generating device;

fig. 2 shows a cross-sectional view of the aerosol-generating device of fig. 1;

FIG. 2a shows a partial enlarged view of FIG. 2;

FIG. 3 shows a schematic view of a thermally conductive assembly;

FIG. 4 shows a cross-sectional view of the thermally conductive assembly of FIG. 3;

FIG. 5 shows a schematic view of a fastener;

fig. 6 shows a schematic view of a second stator.

Description of main reference numerals:

100-a housing; 101-an air inlet; 102-a receiving cavity; 103-open end; 110-a power supply; 200-heat insulation member; 300-a thermally conductive assembly; 301-an air inlet window; 310-heating element; 320-upper heat conducting member; 321-air outlet holes; 330-a lower heat conducting member; 3301-groove structure; 331-a heat storage cavity; 341-a first flow passage; 342-a second flow vent; 343-third flow airways; 400-preheating zone; 401-a first preheating zone; 402-a second preheating zone; 500-fixing pieces; 510-a first stator piece; 511-a first seal; 520-a second stator piece; 521-slot holes; 522-boss; 600-base; 601-second seal.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

Examples

Referring to fig. 1, 2 and 2a, in the present embodiment, an aerosol-generating device is provided, which includes a housing 100 and a heat conducting component 300, wherein the housing 100 is provided with an air inlet 101 and a receiving cavity 102 for receiving an aerosol-generating article, and the receiving cavity 102 is in communication with the air inlet 101. The casing 100 is provided with a tubular heat insulating member 200 therein, and the heat conducting assembly 300 is disposed in the heat insulating member 200 and spaced apart from the heat insulating member 200. The heat insulator 200 is disposed in the housing 100 and forms an air inlet channel with the housing 100, and the air inlet channel is communicated with the air inlet 101.

The heat conducting assembly 300 is disposed in the heat insulating member 200 and corresponds to the accommodating chamber 102, and in particular, the heat conducting assembly 300 is disposed at one end of the accommodating chamber 102 for electrically heating air circulated therethrough to effect heating of the aerosol-generating article. The heat transfer assembly 300 forms a preheating zone 400 with the inner surface of the heat shield 200, and the inlet duct communicates with the preheating zone 400 such that air enters and flows from the air inlet 101 to the receiving chamber 102. Specifically, the side surface of the heat conducting assembly 300 is provided with an air inlet window 301, and the preheating zone 400 is communicated with the air inlet window 301 so that air is sucked into the accommodating cavity 102 through the heat conducting assembly 300.

The air inlet 101 of the aerosol-generating device may be provided at the top of the housing 100, and air flows into the air inlet channel in the housing 100 through the air inlet 101, and the number of the air inlets 101 may be one or more as required. The aerosol generating device comprises a device body and a shell, a charging interface, a controller and a power supply 110 switch, wherein the shell, the charging interface, the controller and the power supply 110 switch are arranged in the device body, the power supply 110 is arranged in the shell 100, the charging interface is used for charging the power supply 110, and the power supply 110 switch is used for controlling the power supply 110 to be turned on and off. The heat conducting component 300 comprises a heating circuit, the power supply 110 is electrically connected with the heating circuit, the power supply switch is turned on, the internal controller is started, the power supply 110 is controlled to supply power, the power supply 110 supplies power to the heating circuit, the heat conducting component 300 generates heat, and heat generated by the heat conducting component 300 is transferred to the internal part and the periphery of the heat conducting component. Preferably, the heat conduction assembly 300 is resistance heated, and is capable of conducting heat and actively generating heat.

When the aerosol generating device is in operation, the heat generated by the heat conducting assembly 300 heats the air in the heat conducting assembly 300, and the residual heat is transferred to the preheating zone 400 to preheat the air in the preheating zone 400. During the sucking process, air flows through the air inlet 101, flows through the air passage and enters the air inlet window 301 through the preheating zone 400, flows into the accommodating cavity 102, enters the heat conducting assembly 300 from the air inlet window 301, and is directly heated by the heating element 310, so that the temperature in the accommodating cavity 102 is quickly increased to bake the aerosol-generating product to generate aerosol for sucking by a user. Since the heat conduction assembly 300 is disposed in the heat insulation member 200, heat generated by the heat conduction assembly 300 can be more concentrated in the heat insulation member 200, so that heat loss can be effectively reduced, and full use of heat energy can be realized.

The preheating zone 400 includes a first preheating zone 401 and a second preheating zone 402, the first preheating zone 401 is disposed along the inner surface of the heat insulating member 200, the second preheating zone 402 is disposed on the outer surface of the heat conducting member 300, and the first preheating zone 401 is communicated with the second preheating zone 402. During the flowing process, air flows through the first preheating zone 401 and the second preheating zone 402 in sequence and is preheated twice, so that the temperature is rapidly increased.

As shown in fig. 3 and 4, in the present embodiment, the heat conducting assembly 300 has a heat conducting body, the heat conducting body includes a heat generating element 310, an upper heat conducting element 320 and a lower heat conducting element 330, the heat generating element 310 includes a ceramic cylinder and a heat generating circuit, the heat generating circuit can be disposed on an outer side surface of the ceramic cylinder, and the upper heat conducting element 320 and the lower heat conducting element 330 are provided with a central hole for the ceramic cylinder to pass through. A first air flow passage 341 is formed between the outer sidewall of the upper heat conductive member 320 and the inner surface of the lower heat conductive member 330, a second air flow passage 342 is formed between the bottom of the upper heat conductive member 320 and the lower heat conductive member 330, and a third air flow passage 343 is formed between the inner wall of the central hole of the upper heat conductive member 320 and the heating body. The first air passage 341, the second air passage 342 and the third air passage 343 are sequentially communicated, and the first air passage 341, the second air passage 342 and the third air passage 343 are not positioned on the same straight line, so that the structure can increase the flow path of the air flow when heating the air, and the air flowing through the heat conducting assembly 300 can be sufficiently heated. Wherein the first air flow channels 341 communicate with the air inlet window 301, and the third air flow channels 343 communicate with the air outlet holes 321.

The air inlet window 301 is disposed between the upper heat conducting member 320 and the lower heat conducting member 330, the upper heat conducting member 320 has an air outlet 321, and the second preheating zone 402 is a space concavely disposed on the heat conducting component 300 adjacent to the air inlet window 301. As shown in fig. 3, the top of the lower heat conducting member 330 is provided with a cavity structure 3301, and the cavity structure 3301 forms a recess, thereby forming the second preheating zone 402. After being preheated by the preheating zone 400, the air flows into the heat conduction assembly 300 through the air inlet window 301 and is heated by the heating element 310 of the heat conduction assembly 300, and then flows into the accommodating cavity 102 through the air outlet hole 321 to realize baking and heating of the aerosol-generating article.

In some embodiments, the diameter of the air outlet 321 is smaller than the diameter of the air inlet 301, so that the air flowing out of the heat conducting assembly 300 can be controlled, so that the air can be heated sufficiently before flowing out of the air outlet 321.

In order to fix the heat conduction assembly 300, the heat conduction assembly 300 is connected with the fixing member 500 positioned at the inner side of the heat insulation member 200, and the heat conduction assembly 300 is surrounded and supported by the fixing member 500. The fixture 500 forms at least a portion of the receiving cavity 102 and at least a portion of the first preheating zone 401 is formed between the fixture 500 and the heat shield 200.

As shown in fig. 5, the fixing member 500 includes a first fixing member 510 and a second fixing member 520. The first stator 510 and the second stator 520 are made of a material resistant to high temperature (150 ℃ and above), such as a metallic material or a nonmetallic material, e.g., aluminum alloy, stainless steel, ceramic, etc.

The second fixing member 520 is provided with a slot 521, and the second fixing member 520 is sleeved on the lower heat conducting member 330, where the slot 521 at least partially overlaps or does not overlap with the projection position of the air inlet window 301. The number of slots 521 may be one or more as desired. The second fixing member 520 is a tubular body, and the slot 521 is hollowed out on the tubular body. At least a portion of the space of the second preheating zone 402 is surrounded by the heat conductive assembly 300 and the second stator 520.

In the present embodiment, the first preheating zone 401 is formed between the second stator 520 and the heat insulator 200, and the second preheating zone 402 is formed between the upper heat conductive member 320 and the second stator 520. The heat conducting component 300 and the second fixing sub-component 520 have higher heat conductivity, so that the upper heat conducting component 320 and the second fixing sub-component 520 can quickly transfer the heat generated by the heating component 310, thereby realizing the preheating of the air flowing through the second fixing sub-component 520 and the upper heat conducting component 320.

The second stator 520 and the heat insulator 200 are both hollow cylindrical structures, thereby forming the annular first preheating zone 401. The outer side of the upper heat conductive member 320 is cylindrical, and the upper heat conductive member 320 partially extends into the second stator member 520, thereby forming the annular second preheating zone 402.

The preheated air in the preheating zone 400 flows to the side wall of the heat conduction assembly 300 through the slots 521, and then flows into the heat conduction assembly 300 through the air inlet window 301. When the projection positions of the slot 521 and the air inlet window 301 are not overlapped, the air flowing through the slot 521 will pass through the side wall of the heat conduction component 300, absorb the heat of the side wall of the heat conduction component 300, and flow to the air inlet window 301, and in this process, the temperature of the air will be further increased, so as to improve the efficiency of heating the air; when the slot 521 overlaps with the projection position of the air inlet window 301, the air flowing through the slot directly enters the heat conduction assembly 300 through the air inlet window 301, and the rest passes through the side wall of the heat conduction assembly 300 to absorb the heat of the side wall of the heat conduction assembly 300 and then enters the heat conduction assembly 300 through the air inlet window 301.

The area of the slot 521 is larger than or equal to the area of the air inlet window 301, so that the air inlet of the heat conduction assembly 300 is controlled, and the air entering the heat conduction assembly 300 can be sufficiently heated, so that uneven or insufficient heating caused by overlarge air inlet is avoided.

The top surface of the slot 521 is not higher than the top surface of the heat conducting component 300, and the bottom surface of the slot 521 is not lower than the bottom surface of the heat conducting component 300, so that when air flows from the slot 521 to the air inlet window 301 of the heat conducting component 300, the air does not directly flow across the heat conducting component 300, and the air can absorb heat on the outer side wall of the heat conducting component 300.

The first stator 510 is sleeved on the upper heat conducting member 320, and the first stator 510 extends upwards to the open end 103 of the housing 100 to form a containing cavity 102 for containing the aerosol-generating article. Specifically, the area of the upper heat conductive member 320 sleeved with the first stator member 510 is smaller than the area of the lower heat conductive member 330 sleeved with the second stator member 520, and this structure can reduce the heat absorption of the heat conductive assembly 300 by the first stator member 510.

In order to fix the lower heat conductive member 330, the lower heat conductive member 330 is mounted on the inner surface of the second stator 520. As shown in fig. 6, the second stator 520 has a boss 522 disposed therein, and the outer sidewall of the lower heat conductive member 330 abuts against the boss 522 to form a sealing structure, so that air cannot enter the bottom of the lower heat conductive member 330 from the slot 521 of the second stator 520, thereby restricting the flow direction of air and avoiding heat loss.

When the heat conducting component 300 is powered on, the generated heat is transferred to the periphery, and in order to fully utilize the heat, one end of the lower heat conducting component 330, which is far away from the first fixing component 510, is further provided with a heat storage cavity 331, and the heat storage cavity 331, the air inlet 101 and the preheating zone 400 are communicated. Part of heat generated by the heat conduction component 300 can be transferred to the heat storage cavity 331, so that the air in the heat storage cavity 331 is heated, and the purpose of heat storage is achieved. Along with the flow of air, the hot air in the heat storage cavity 331 flows into the preheating zone 400, and then flows into the heat conduction assembly 300 through the slotted hole 521 and the air inlet window 301 to be heated again, so that the air is heated quickly.

As shown in fig. 2a, the outer side wall of the first stator 510 is provided with a first sealing member 511, and the first sealing member 511 is used for sealing a gap between the heat insulation member 200 and the first stator 510, so as to avoid heat loss caused by that air flows out from the gap between the heat insulation member 200 and the first stator 510 to take away heat.

A base 600 is disposed below the bottom of the heat insulator 200, the base 600 is used for fixing the second stator 520, the base 600 and the bottom of the heat insulator 200 have an air passing gap, and air flowing in from the air inlet 101 flows through an air flow channel between the inner surface of the housing 100 and the outer side wall of the heat insulator 200 and the air passing gap between the base 600 and the heat insulator 200 in sequence, and then flows into the preheating zone 400 and flows into the heat storage cavity 331. The second fixing member 520 and the base 600 may be fixedly connected by plugging, bonding, clamping, or the like. For example, the bottom of the second stator 520 is convexly provided with a socket, and the base 600 is provided with a socket, wherein the socket is inserted into the socket, thereby realizing the fixed connection between the second stator 520 and the base 600.

As shown in fig. 2a, the outer sidewall of the base 600 is provided with a second sealing member 601, and the second sealing member 601 is used for sealing a gap between the housing 100 and the base 600, thereby avoiding heat loss caused by heat being carried away by air flowing out from the gap between the housing 100 and the base 600.

In this embodiment, the first sealing member 511 and the second sealing member 601 may each employ a sealing ring.

The aerosol-generating device of the present application has an air flow direction of: after the air flowing in from the air inlet 101 sequentially flows through the air flow channel between the inner surface of the housing 100 and the outer side wall of the heat insulating member 200 and the air passing gap between the base 600 and the heat insulating member 200, most of the air enters the preheating zone 400 and then sequentially flows into the accommodating chamber 102 through the slots 521, the air inlet window 301 and the inside of the heat conducting module 300; a small portion of the air enters the heat storage chamber 331. When the aerosol generating device works, the power switch is turned on, the internal controller is started to control the power supply to supply power, the power supply 110 supplies power to the heating circuit, so that the heat conduction assembly 300 heats, the heat generated by the heat conduction assembly 300 heats the air in the heat conduction assembly 300, and the residual heat is transferred to the preheating zone 400 and the heat storage cavity 331 so as to preheat the air in the first preheating zone 401, the second preheating zone 402 and the heat storage cavity 331; in the sucking process, the user sucks the air of the first preheating zone 401, the second preheating zone 402 and part of the heat storage cavity 331 from the air inlet window 301 to the heat conducting component 300, and then the heat generating component 310 directly heats the air, so as to bake the aerosol generating product to generate aerosol for sucking by the user. When the suction is stopped, part of air in the heat storage cavity 331 stays in the heat storage cavity 331, part enters the preheating zone 400, and meanwhile, the air flowing in from the air inlet 101 is prepared for the second suction to form a thermal cycle during the suction, so that the heat conversion rate of the heat conduction assembly 300 is greatly improved; by providing the upper and lower heat conductive members 320 and 330, the first, second and third air passages 341, 342 and 343 are formed, and the flow path of the air flow when heating the air is increased, so that the air flowing through the inside of the heat conductive assembly 300 can be sufficiently heated, and the heating efficiency is improved; by providing the heat shield 200, the first seal 511 and the second seal 601, heat loss is effectively reduced, and the service life of the device is ensured and long-lasting operation can be performed sustainably.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. The utility model provides an aerosol generating device, includes casing and heat conduction subassembly, set up air inlet and be used for holding the chamber that holds that aerosol generated the goods on the casing, hold the chamber with air inlet is linked together, its characterized in that, be equipped with tubular heat insulating part in the casing, the heat conduction subassembly locate in the heat insulating part and with the heat insulating part interval sets up, the heat conduction subassembly is located hold the one end in chamber and be used for the electrical heating aerosol generating the goods, the heat conduction subassembly with form a preheating zone between the internal surface of heat insulating part, the inlet window is seted up to the heat conduction subassembly side surface, the preheating zone with the inlet window is linked together so that the air passes the heat conduction subassembly is sucked to hold the chamber.

2. The aerosol-generating device of claim 1, wherein the preheating zone comprises a first preheating zone disposed along an inner surface of the thermal shield and a second preheating zone disposed on an outer surface of the thermally conductive assembly, the first preheating zone being in communication with the second preheating zone.

3. The aerosol-generating device of claim 2, wherein the heat conducting assembly has an upper heat conducting member and a lower heat conducting member, the air inlet window is disposed between the upper heat conducting member and the lower heat conducting member, and the second preheating zone is a space recessed on the heat conducting assembly adjacent to the air inlet window.

4. An aerosol-generating device according to claim 3, wherein the heat conducting assembly is connected to a fixture located inside the heat insulating member, the fixture forming at least part of the receiving cavity, and at least part of the first preheating zone being formed between the fixture and the heat insulating member.

5. An aerosol-generating device according to claim 4, wherein the fixing element comprises a first fixing element and a second fixing element, the second fixing element being provided with a slot, the slot being at least partially overlapping or non-overlapping with the projection of the inlet window.

6. The aerosol-generating device of claim 5, wherein the end of the lower thermally conductive member remote from the first stationary member further comprises a heat storage chamber, the air inlet and the preheating zone being in communication.

7. The aerosol-generating device of claim 5, wherein the second stator member is a tubular body, and the slot is hollowed out in the tubular body.

8. The aerosol-generating device of claim 7, wherein at least a portion of the space of the second preheating zone is surrounded by the heat conducting assembly and the second stator piece.

9. An aerosol-generating device according to any of claims 1 to 8, wherein the thermal insulation is arranged between the housing to form an air inlet channel, the air inlet channel being in communication with the air inlet.

10. An aerosol-generating device according to any of claims 9, wherein the inlet duct communicates with the preheating zone such that air flows from the air inlet into the receiving chamber.