An aerosol generating device and a heat exchange member for an aerosol generating device

Abstract

This application relates to the field of atomization technology, specifically to an aerosol generating device and a heat exchanger for the aerosol generating device. The aerosol generating device includes a shell, a accommodating cavity, a heating element, and a heat exchanger. The accommodating cavity is used to accommodate an aerosol generating rod and has an opening for the aerosol generating rod to enter the accommodating cavity. The heat exchanger is disposed inside the shell, with the opening located at one end of the accommodating cavity and the heat exchanger located at the other end of the accommodating cavity. The heating element is used to heat the heat exchanger. The heat exchanger includes a substrate and an oleophobic layer. A heat exchange channel for airflow is provided on the substrate and communicates with the accommodating cavity. The oleophobic layer at least covers the inner wall of the heat exchange channel and is used to prevent oil from adhering to the area covered by the oleophobic layer, ensuring smooth airflow and preventing oil accumulation in the heat exchange channel from producing off-flavors when the heat exchanger is at high temperature.

Description

Technical Field

[0001] This application relates to the field of atomization technology, specifically to an aerosol generating device and a heat exchanger for the aerosol generating device. Background Technology

[0002] One type of aerosol generating device uses a heating-without-combustion method to heat the aerosol generating matrix in an aerosol generating rod to generate aerosols. This type of aerosol generating device has a receiving cavity for inserting the aerosol generating rod and a heating structure for heating the aerosol generating matrix in the aerosol generating rod. One form of the heating structure includes a heat exchanger with a heat exchange passage for gas. In use, the heat exchanger itself is heated, and the gas is heated into a hot gas stream after passing through the heat exchange passage. The hot gas stream enters the aerosol generating rod and heats the aerosol generating matrix to generate aerosols.

[0003] Heating the aerosol-generating matrix can produce oil, which can drip onto the heat exchange components and clog the heat exchange channels, causing poor suction. Furthermore, the high operating temperature of the heat exchange components can heat the adhering oil, producing an unpleasant odor and negatively impacting the user experience. Utility Model Content

[0004] This application provides an aerosol generating device to improve the technical problem that oil droplets falling onto the heat exchanger in current aerosol generating devices can easily cause poor suction and generate off-flavors; this application also provides a heat exchanger used in the above-mentioned aerosol generating device.

[0005] In a first aspect, this application provides an aerosol generating apparatus, comprising:

[0006] shell;

[0007] A receiving cavity for receiving an aerosol generating rod, the receiving cavity having an opening for allowing the aerosol generating rod to enter the receiving cavity;

[0008] Heating element;

[0009] The device includes a heat exchanger disposed within the housing, a accommodating cavity extending in the direction of the aerosol generating rod entering and exiting the accommodating cavity, an opening located at one end of the accommodating cavity, and the heat exchanger located at the other end of the accommodating cavity. A heating element is used to heat the heat exchanger. The heat exchanger includes a substrate and an oleophobic layer. A heat exchange channel for airflow is provided on the substrate and communicates with the accommodating cavity. The oleophobic layer at least covers the inner wall of the heat exchange channel and is used to prevent oil from adhering to the area covered by the oleophobic layer.

[0010] In one embodiment, the heat exchanger has a top surface facing the accommodating cavity, and the oleophobic layer also covers the top surface.

[0011] In one embodiment, the oleophobic layer is an oleophobic coating.

[0012] In one embodiment, the aerosol generating device further includes an oil collection tank located on the side of the heat exchanger facing away from the accommodating cavity, so that the oil on the heat exchanger can fall into the oil collection tank under the action of gravity.

[0013] In one embodiment, the aerosol generating device has a sensing chamber, and the aerosol generating device further includes a separating membrane separating the sensing chamber from the oil collecting tank. The aerosol generating device also includes a sensing element for detecting the gas pressure in the sensing chamber. The separating membrane is deformable when the aerosol generating rod is drawn in, so that the sensing element can sense the aspiration state of the aerosol generating device by detecting the gas pressure change in the sensing chamber.

[0014] In one embodiment, the separating membrane at least partially forms the bottom of the oil collecting tank, and the middle portion of the bottom of the oil collecting tank protrudes towards the location of the heat exchanger, such that the middle portion of the bottom of the oil collecting tank is higher than the surrounding portion.

[0015] In one embodiment, the aerosol generating device further includes a heating assembly, the heating assembly including the heat exchanger, the accommodating cavity being at least partially located within the heating assembly, the aerosol generating device further includes a sealing seat, the sensing element being mounted in the sealing seat, the oil collecting groove being formed on the sealing seat, the separating membrane being integrally formed with the sealing seat, and one end of the heating assembly being sealed and inserted into the sealing seat.

[0016] Secondly, this application provides a heat exchanger for an aerosol generating device, the aerosol generating device being used in conjunction with an aerosol generating rod, the heat exchanger comprising:

[0017] A substrate having heat exchange channels through which airflow passes;

[0018] An oleophobic layer, which at least covers the inner wall of the heat exchange passage, is used to prevent oil from adhering to the area covered by the oleophobic layer.

[0019] In one embodiment, one end of the heat exchange air passage is an air inlet and the other end is an air outlet. The surface of the substrate on which the air outlet is located is the top surface, and the oleophobic layer also covers the top surface.

[0020] In one embodiment, the oleophobic layer is an oleophobic coating.

[0021] According to the aerosol generating device of the above embodiment, when in use, the adapted aerosol generating rod is inserted into the receiving cavity through the opening. The user draws in the aerosol generating rod, which is heated by the heat exchange channel of the heat exchanger to form high-temperature gas that flows to the aerosol generating rod. The high-temperature gas enters the aerosol generating rod and heats its aerosol generating matrix into an aerosol for the user to inhale. During this process, if the oil generated by the aerosol generating rod drips into the heat exchange channel of the heat exchanger, the oil will not easily adhere to the inner wall of the heat exchange channel due to the oleophobic layer on the inner wall of the heat exchange channel, and will flow out of the heat exchange channel. This avoids the oil from clogging the heat exchange channel, ensuring the smooth flow and volume of air intake, and at the same time, it prevents the accumulation of oil in the heat exchange channel from producing an odor when the heat exchanger itself is at a high temperature. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the aerosol generating device and the aerosol generating rod in one embodiment of this application;

[0023] Figure 2 This is a cross-sectional view of the aerosol generating device and the aerosol generating rod in a combined state in one embodiment of this application.

[0024] Figure 3 This is a cross-sectional view of a partial structure of an aerosol generating device in one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of a heat exchanger in one embodiment of the aerosol generation device.

[0026] Figure 5 This is a schematic diagram of the structure of the lower mounting base of the aerosol generating device in one embodiment of the application.

[0027] List of feature names corresponding to the labels in the figure:

[0028] 10. Aerosol generating rod; 11. Outer tube; 12. Filter element; 13. Aerosol generating matrix; 14. Plug;

[0029] 20. Aerosol generating device; 21. Outer shell; 22. Receptacle; 221. Opening; 23. Heating component; 231. Heating element; 232. Heat exchanger; 2321. Body; 2322. Heat exchange air passage; 2323. Flange; 2324. Oleophobic layer; 233. Upper mounting base; 234. Lower mounting base; 2341. Through hole; 2342. Air passage; 235. Protective tube; 236. Annular cavity; 24. Oil collection tank; 25. Sensing element; 26. Sensing cavity; 27. Separating membrane; 28. Sealing seat; 29. ​​Battery cell. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0031] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0032] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0033] Before detailing the aerosol generation device, let's first combine... Figure 1 and Figure 2 The aerosol generating rod 10 used in conjunction with the aerosol generating device is described below. The aerosol generating rod 10 includes an outer tube 11 that can maintain its shape. The outer tube 11 has a straight tube structure, with one end being a suction end for the user to inhale and the other end being an air inlet end. Generally, a filter element 12 is provided inside the suction end of the outer tube 11, and an aerosol generating matrix 13 is filled inside the air inlet end of the outer tube 11. The aerosol generating matrix 13 can generally be an aerosol filament, aerosol particles, or aerosol sheet. The aerosol generating matrix 13 can generate aerosol when heated. In some embodiments, the air inlet end of the aerosol generating rod 10 is also provided with a plug 14, which is located on the side of the aerosol generating matrix 13 facing away from the filter element 12. The plug 14 is provided with vent holes for gas to pass through.

[0034] During suction, the heating structure of the aerosol generating device heats the aerosol generating matrix 13 of the aerosol generating rod 10, causing the aerosol generating matrix 13 to generate aerosol. External air enters the aerosol generating rod 10 through the air inlet end of the aerosol generating rod 10, mixes with the aerosol to form a mixed airflow, and flows to the filter element 12. After being filtered by the filter element 12, it is suctioned by the user.

[0035] The more specific structure of the aerosol generating rod 10 and the specific material of the aerosol generating matrix 13 are existing technologies and will not be described in detail here. Of course, the structure of the aerosol generating rod 10 that cooperates with the aerosol generating device in this application can also be a feasible structure in the future, and the aerosol generating matrix 13 can also be a feasible material in the future.

[0036] Examples of the aerosol generating apparatus in this application:

[0037] Please refer to Figure 1 and Figure 2 The aerosol generating device 20 is used in conjunction with the aerosol generating rod 10. As previously described, the aerosol generating rod 10 provides the aerosol generating matrix 13, and the aerosol generating device 20 can heat the aerosol generating matrix 13 of the aerosol generating rod 10 to generate aerosols for the user to inhale. The aerosol generating device 20 and the aerosol generating rod 10 together form an aerosol generating system.

[0038] For information on the internal structure of the aerosol generating device 20, please refer to [link / reference needed]. Figure 2 and Figure 3 The aerosol generating device 20 includes a housing 21, which encloses an inner cavity for mounting various working elements. The aerosol generating device 20 also has a receiving cavity 22 for accommodating the aerosol generating rod 10. Corresponding to the straight rod shape of the aerosol generating rod 10, the receiving cavity 22 is a straight chamber, with an opening 221 at one end. This opening 221 allows the aerosol generating rod 10 to pass through, enabling it to be inserted into and removed from the receiving cavity 22. It should be noted that the insertion and removal mentioned here refer to the partial insertion and removal of the aerosol generating rod 10 into and from the receiving cavity 22. Figure 1 and Figure 2 As shown, after the aerosol generating rod 10 is inserted into the accommodating cavity 22, its suction end, which is equipped with a filter element 12, is located outside the outer shell 21 of the aerosol generating device 20 for the user to inhale.

[0039] To heat the aerosol generating matrix 13 of the aerosol generating rod 10, the aerosol generating device 20 also includes a heating component 23 disposed within the housing 21. Please refer to... Figure 3The heating component 23 includes a heating element 231, which generates heat when energized to heat the aerosol generating matrix 13 of the aerosol generating rod 10, thereby generating aerosol. The aerosol generating device 20 also includes a battery cell 29, which supplies power to the heating element 231.

[0040] In some embodiments, the heating element 231 is a cylindrical heating cylinder, and the inner cavity of the heating cylinder forms part of the receiving cavity 22. In use, the portion of the aerosol generating rod 10 that is provided with the aerosol generating matrix 13 and the plug 14 is inserted into the heating element 231.

[0041] Heating assembly 23 also includes heat exchanger 232, which is located at the other end of accommodating cavity 22, i.e., the end away from opening 221. Please refer to [reference needed]. Figure 4 The heat exchanger 232 includes a body 2321, which is made of a thermally conductive material. Optionally, the body 2321 may be made of an alloy material. In terms of shape, the body 2321 has a cylindrical structure. Multiple heat exchange passages 2322 are provided on the body 2321, which penetrate the body 2321, allowing gas to pass through the body 2321 via the heat exchange passages 2322. The lower end of the body 2321 has a radially outwardly convex flange 2323.

[0042] To prevent the oil generated when the aerosol generating matrix 13 is heated from adhering to the body 2321, the heat exchanger 232 also includes an oleophobic layer 2324 disposed on the body 2321. Based on the assembly and cooperation between the heat exchanger 232 and the heating element 231, the heat exchange air passage 2322 is connected to the accommodating cavity 22. The lower port of the heat exchange air passage 2322 is an air inlet for gas to enter, and the upper port is an upper port for gas to flow out and flow to the accommodating cavity 22. The upper port is disposed on the top surface of the heat exchanger 232 facing the accommodating cavity 22. Part of the oleophobic layer 2324 covers the inner wall of the heat exchange air passage 2322, and part of it covers the top surface of the heat exchanger 232.

[0043] like Figure 3 As shown, after assembly, the heat exchanger 232 is inserted into the cylindrical heating element 231, with its lower end abutting against the lower end of the heating element 231 via a flange 2323, thus determining the installation position of the heat exchanger 232. During operation, the heating element 231 heats the heat exchanger 232, and the gas passing through the heat exchange passage 2322 is heated into high-temperature gas. Here, "high-temperature" means that the gas temperature is sufficient to heat the aerosol generating matrix 13 into an aerosol. Simultaneously, the heating element 231 heats the heat exchanger 232 and also heats the aerosol generating matrix 13 of the aerosol generating rod 10.

[0044] In some other embodiments, the heating element 231 of the heating assembly 23 may also be a heating wire embedded in the heat exchanger 232. The heat exchanger 232 itself may also have a lumen into which at least a portion of the aerosol generating rod 10 is inserted.

[0045] The oleophobic layer 2324 is oleophobic, preventing oil from adhering to it. Oil droplets falling on the oleophobic layer 2324 can slide off along it. Thus, when the aerosol generating device 20 heats the aerosol generating rod 10, even if oil droplets from the aerosol generating matrix 13 fall onto the heat exchanger 232, they will fall onto the oleophobic layer 2324. The oil will not adhere to the oleophobic layer 2324, but will flow downwards along the oleophobic layer 2324 through the heat exchange channel 2322 and drip off the heat exchanger 232. This prevents oil from clogging the heat exchange channel 2322, affecting the smoothness of ventilation and the intake volume during suction, and also prevents the heat exchanger 232 from producing off-flavors when heating the oil.

[0046] In some other embodiments, the oleophobic layer 2324 can completely cover all surfaces of the body 2321. Alternatively, the oleophobic layer 2324 can only cover the inner wall of the heat exchange duct 2322. This solves the technical problems of oil adhering to the inner wall of the heat exchange duct 2322 and clogging the heat exchange duct 2322, ensuring smooth ventilation and air intake. It also prevents the oil adhering to the inner wall of the heat exchange duct 2322 from producing odors when heated by the heat exchanger 232. However, this structure cannot prevent oil from adhering to the top surface of the heat exchanger 232, so the odor is only reduced to a certain extent.

[0047] Regarding the material of the oleophobic layer 2324 and the molding method of the oleophobic layer 2324 on the body 2321, in some embodiments, the oleophobic layer 2324 can be a fluorinated silica sol-gel deposition film, and the oleophobic layer 2324 of this material is molded on the body 2321 in the following manner:

[0048] a) Sol preparation

[0049] Precursor solution: Tetraethyl orthosilicate (TEOS) and 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FAS) are mixed in a molar ratio of 3:1;

[0050] Solvent system: ethanol / deionized water (volume ratio 9:1), pH adjusted to 4.5 (acetic acid catalysis);

[0051] Hydrolysis time: 48 hours (forms a transparent fluorinated SiO2 sol);

[0052] b) Immersion coating

[0053] Vacuum-assisted impregnation method is adopted: the body 2321 is immersed in the sol and then vacuumed to 10 kPa and maintained for 30 minutes to ensure that the sol penetrates into the heat exchange channel 2322;

[0054] Lifting speed: 2mm / s (to form a uniform wet film);

[0055] c) Heat treatment

[0056] Gradient heating: Pre-curing at 120℃ for 1 hour → calcination at 350℃ for 2 hours (heating rate 5℃ / min)

[0057] Structure formed: -CF2 / CF3 groups are embedded in a porous SiO2 framework, and the surface static contact angle reaches 162°.

[0058] In some other embodiments, the oleophobic layer 2324 can also be an oleophobic composite film based on LPCVD deposition of fluorocarbon polymer, and the forming process is as follows:

[0059] a) Material pretreatment:

[0060] The main body 2321 is made of 316L stainless steel, and the heat exchange air passage 2322 has holes with a diameter of 0.8-1.5mm;

[0061] Cleaning steps: Clean the surface with acetone and ethanol by ultrasonic cleaning for 30 minutes in sequence, dry with nitrogen, and then place it in a vacuum furnace and anneal at 200°C for 2 hours to remove surface organic matter.

[0062] b) Fluorocarbon polymer coating

[0063] Process parameters:

[0064] Reaction gases: Tetrafluoroethylene (C2F4) and argon are mixed at a volume ratio of 1:10;

[0065] Deposition temperature: 150℃ (can be adjusted according to target operating temperature);

[0066] Vacuum degree: 10⁻² Pa;

[0067] Deposition time: 120 minutes;

[0068] Structure formation: Nanoscale PTFE (polytetrafluoroethylene) particles cover the substrate surface in an island-like growth pattern, forming a micro / nano composite rough structure.

[0069] c) Post-processing

[0070] Low-temperature plasma treatment (50W power, 5 minutes) enhances the adhesion between the film and the substrate.

[0071] Of course, the material and forming process of the oleophobic layer 2324 are not limited to the above-mentioned embodiments. For example, the oleophobic layer 2324 can also be formed on the heat exchanger 232 by means of spraying process, roughness modification process, etc.

[0072] As mentioned earlier, due to the oleophobic layer 2324, oil droplets falling onto the heat exchanger 232 will not adhere to the heat exchanger 232, but will drip down along the oleophobic layer 2324 through the heat exchange air passage 2322. Therefore, in order to collect the oil dripping from the heat exchanger 232, the aerosol generating device 20 also has an oil collection tank 24. Please refer to [reference needed]. Figure 3 The oil collection tank 24 is located on the side of the heat exchanger 232 facing away from the accommodating cavity 22. The direction of insertion and withdrawal of the aerosol generating rod 10 in the accommodating cavity 22 is defined as the up and down direction. The oil collection tank 24 is located below the heat exchanger 232, so that the oil on the heat exchanger 232 can fall into the oil collection tank 24 under the action of gravity.

[0073] like Figure 3 As shown, the heating assembly 23 includes an upper mounting base 233, a lower mounting base 234, and a protective tube 235. The heating element 231 and the heat exchange element 232 are sandwiched between the upper mounting base 233 and the lower mounting base 234. Figure 3 As shown, the upper end of the heating element 231 mates with the upper mounting base 233, and the heat exchange element 232 mates with the lower mounting base 234. The protective tube 235 is nested inside and outside the cylindrical heating element 231, with the protective tube 235 on the outside and the heating element 231 on the inside. In one embodiment, the protective tube 235 and the upper mounting base 233 are integrally formed, and the lower end of the protective tube 235 is fitted onto the outside of the lower mounting base 234. Thus, the upper mounting base 233, the lower mounting base 234, the protective tube 235, and the heating element 231 form an annular cavity 236. In other embodiments, the protective tube 235 and the upper mounting base 233 can also be assembled separately.

[0074] The upper mounting base 233 and the heating element 231 have a gas inlet that connects the annular cavity 236 to the outside world. The outside world refers to the atmospheric environment outside the aerosol generating device 20. In one embodiment, a section of the opening 221 of the accommodating cavity 22 is a large-diameter section with a diameter larger than the inner cavity of the heating element 231. There is a fitting gap between the aerosol generating rod 10 and the large-diameter section, which allows gas to pass through. The gas inlet connects the annular cavity 236 to the gap to realize the connection between the annular cavity 236 and the outside atmosphere.

[0075] Please refer to Figure 5The lower mounting base 234 has a through hole 2341 connecting the oil collecting tank 24 and the annular cavity 236. The lower mounting base 234 also has a gas passage 2342 for gas to pass through, allowing gas in the oil collecting tank 24 to flow to the heat exchange gas passage 2322. The gas passage 2342 also allows oil to fall into the oil collecting tank 24. Since it is in contact with the heat exchange component 232, the lower mounting base 234 is made of a high-temperature resistant material; optionally, it is made of PEEK (polyetheretherketone) material.

[0076] The user inhales the aerosol generating rod 10, such as Figure 3 As shown by the middle arrow, external gas enters the annular cavity 236 through the gap between the aerosol generating rod 10 and the opening 221, and the gas inlet between the upper mounting base 233 and the heating element 231. It flows downward through the through hole 2341 on the lower mounting base 234 into the oil collection tank 24, and then flows to the aerosol generating rod 10 through the gas passage 2342 and the heat exchange gas passage 2322. The gas is heated into high-temperature gas when it flows through the heat exchange gas passage 2322.

[0077] In practical use, the aerosol generating device 20 is required to heat the aerosol generating matrix 13 only when the user is inhaling. Therefore, the aerosol generating device 20 also includes a sensing element 25 for detecting the inhaled state of the aerosol generating device 20. The sensing element 25 is a component that can sense changes in air pressure and generate a current signal. A sensing cavity 26 is provided corresponding to the sensing element 25. The sensing cavity 26 is a closed chamber. One side of the sensing element 25 can sense the air pressure inside the sensing cavity 26, and the other side can sense the air pressure inside the outer shell 21 of the aerosol generating device 20. The sensing cavity 26 is separated from the oil collection tank 24 by a separating membrane 27, which can prevent oil from contaminating the sensing element 25. Furthermore, the separating membrane 27 is a deformable membrane structure, which can be an elastic membrane or a non-elastic membrane. When an atmospheric pressure difference occurs between the sensing cavity 26 and the oil collection tank 24, the separating membrane 27 can deform under the action of the atmospheric pressure difference.

[0078] Therefore, when the user inhales the aerosol generating rod 10, the gas in the oil collection tank 24 is drawn in, causing a pressure drop. The gas pressure in the sensing chamber 26 is greater than that in the oil collection tank 24. At this time, the separating membrane 27 deforms towards the location of the heat exchanger 232 under the action of the gas pressure in the sensing chamber 26, increasing the chamber volume of the sensing chamber 26 and decreasing the gas pressure. The sensing element 25 senses the decrease in gas pressure in the sensing chamber 26, and thus senses the user's inhalation of the aerosol generating rod 10. After sensing the change in gas pressure, the sensing element 25 can output an electrical signal to the controller. The controller controls whether the heating element 231 is energized to generate heat based on the monitoring results of the sensing element 25. In some embodiments, the sensing element 25 can be a microphone. In other embodiments, the aerosol generating device 20 can also have a mounting cavity communicating with the annular cavity 236. The sensing element 25 is installed in the mounting cavity and senses the change in gas pressure in the annular cavity 236 to realize the sensing of the inhalation action.

[0079] In some embodiments, such as Figure 3 As shown, the sensing cavity 26 is located below the oil collection tank 24, and the separating membrane 27 forms the bottom of the oil collection tank 24. This reduces the cross-sectional size of the aerosol generating device 20 and improves the user's comfort in holding the aerosol generating device 20. The middle part of the bottom of the oil collection tank 24 formed by the separating membrane 27 protrudes towards the location of the heat exchanger 232, making the middle part of the bottom of the oil collection tank 24 higher than the surrounding part. This allows the oil dripping onto the bottom of the oil collection tank 24 to flow towards the edge of the bottom of the oil collection tank 24, ensuring the deformability of the separating membrane 27, and thus ensuring the sensitivity of the sensing element 25 in sensing the user's suction action. At the same time, the upward-protruding structure in the middle can also guide the airflow towards the heat exchanger 232.

[0080] In other embodiments, the sensing cavity 26 and the oil collecting tank 24 can also be arranged side to side, separated by a partition membrane 27. In this case, the partition membrane 27 forms part of the sidewall of the oil collecting tank 24. Of course, the sensing cavity 26 can be partially located below the oil collecting tank 24 and partially arranged side to side with the oil collecting tank 24. In this case, part of the bottom of the oil collecting tank 24 is formed by the partition membrane 27.

[0081] Regarding the specific configuration of the oil collection tank 24 and the sensing cavity 26, as follows: Figure 3As shown, the aerosol generating device 20 includes a sealing seat 28 made of silicone. A sensing element 25 is installed in the sealing seat 28, and an oil collection tank 24 is also formed on the sealing seat 28. A separating membrane 27 is integrally formed with the sealing seat 28, and one end of the heating component 23 is sealed and inserted into the sealing seat 28 through a protective tube 235. This achieves a high degree of integration of the various structures, reducing the number of parts in the aerosol generating device 20. Of course, in some other embodiments, the separating membrane 27 and the sealing seat 28 can be separate structures, allowing for replacement of the separating membrane 27. The sensing element 25 and the oil collection tank 24 can also be located on two separate components, which are assembled together to form a sensing cavity.

[0082] This application also provides a heat exchanger that is applied to an aerosol generating device. The structure and working principle of the heat exchanger are the same as those of the heat exchangers in the aerosol generating devices described in the above embodiments, and will not be repeated here.

[0083] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. An aerosol generating device, characterized in that, include: shell; A receiving cavity for receiving an aerosol generating rod, the receiving cavity having an opening for allowing the aerosol generating rod to enter the receiving cavity; Heating element; The device includes a heat exchanger disposed within the housing, a accommodating cavity extending in the direction of the aerosol generating rod entering and exiting the accommodating cavity, an opening located at one end of the accommodating cavity, and the heat exchanger located at the other end of the accommodating cavity. A heating element is used to heat the heat exchanger. The heat exchanger includes a substrate and an oleophobic layer. A heat exchange channel for airflow is provided on the substrate and communicates with the accommodating cavity. The oleophobic layer at least covers the inner wall of the heat exchange channel and is used to prevent oil from adhering to the area covered by the oleophobic layer.

2. The aerosol generating apparatus as described in claim 1, characterized in that, The heat exchanger has a top surface facing the accommodating cavity, and the oleophobic layer also covers the top surface.

3. The aerosol generating apparatus as described in claim 1 or 2, characterized in that, The oleophobic layer is an oleophobic coating.

4. The aerosol generating apparatus as described in claim 1, characterized in that, The aerosol generating device also has an oil collection tank, which is located on the side of the heat exchanger facing away from the accommodating cavity, so that the oil on the heat exchanger can fall into the oil collection tank under the action of gravity.

5. The aerosol generating apparatus as described in claim 4, characterized in that, The aerosol generating device has a sensing chamber, and the aerosol generating device further includes a separating membrane that separates the sensing chamber from the oil collecting tank. The aerosol generating device also includes a sensing element for detecting the gas pressure in the sensing chamber. The separating membrane can deform when the aerosol generating rod is drawn in, so that the sensing element can sense the drawing state of the aerosol generating device by detecting the gas pressure change in the sensing chamber.

6. The aerosol generating apparatus as described in claim 5, characterized in that, The separating membrane at least partially forms the bottom of the oil collecting tank, and the middle part of the bottom of the oil collecting tank protrudes towards the location of the heat exchanger, such that the middle part of the bottom of the oil collecting tank is higher than the surrounding part.

7. The aerosol generating apparatus as described in claim 5 or 6, characterized in that, The aerosol generating device further includes a heating component, which includes the heat exchanger. The accommodating cavity is at least partially located within the heating component. The aerosol generating device also includes a sealing seat, in which the sensing element is installed. The oil collecting groove is formed on the sealing seat. The separating membrane is integrally formed with the sealing seat. One end of the heating component is sealed and inserted into the sealing seat.

8. A heat exchanger for an aerosol generating device, the aerosol generating device being used in conjunction with an aerosol generating rod, characterized in that, The heat exchanger includes: A substrate having heat exchange channels through which airflow passes; An oleophobic layer, which at least covers the inner wall of the heat exchange passage, is used to prevent oil from adhering to the area covered by the oleophobic layer.

9. The heat exchanger for the aerosol generating device as described in claim 8, characterized in that, One end of the heat exchange air passage is an air inlet, and the other end is an air outlet. The surface of the substrate where the air outlet is located is the top surface, and the oleophobic layer also covers the top surface.

10. The heat exchanger for the aerosol generating apparatus as described in claim 8 or 9, characterized in that, The oleophobic layer is an oleophobic coating.

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