Aerosol generating apparatus

Abstract

An aerosol generating apparatus, comprising a body (1 ), an extractor (2) that is slidably sleeved on the body (1) and that is internally provided with an accommodating space (220) for accommodating an aerosol-forming matrix (200), and a heating body (14) which is disposed on the body (1) and one end of which is capable of extending into the accommodating space (220). The extractor (2) comprises an elastic component (23): when the extractor (2) is in a connected state with the body (1), the aerosol-forming matrix (200) is located at a first position that can be heated by the heating body (14 ); and when the extractor (2) is in a separated state from the body (1 ),the heating body (14) is at least partially disengaged from the accommodating space (220), so that the aerosol-forming matrix (200) is located at a second position that is at least partially separated from the heating body (14),and the elastic assembly (23) is used to change the length of the accommodating space (220) during a process in which the extractor (2) and the body (1) separate from being connected.

Description

FIELD

[0001] The invention relates to the field of atomization, and more particularly, relates to an aerosol generating device.BACKGROUND

[0002] The heat-not-burning (HNB) aerosol generating device is an aerosol generating device which heat aerosol forming materials in a HNB manner to form inhalable aerosol. At present, a heater, such as a heating plate or heating pin, of aerosol generating devices is inserted into an aerosol-generating substrate to heat the aerosol-generating substrate, and the heating temperature is controlled to make components in the aerosol-generating substrate volatilize to generate aerosol to be inhaled by users.

[0003] When one aerosol-generating substrate is heated for a certain period of time, and the amount of aerosol generated by one aerosol-generating substrate reaches the upper limit,the aerosol-generating substrate needs to be pulled out of the aerosol generating device,or users have to stop smoking or continue to smoke after the aerosol-generating substrate is replaced by a new one. In this case,how to pull the aerosol-generating substrate out of the aerosol generating device easily and quickly without causing damage to the aerosol-generating substrate and leaving residues on the heater becomes an important issue. Aerosol-generating substrates are generally pulled out of existing HNB aerosol generating devices manually by users. However, due to the difference of forces applied by users, the pulling force varies drastically, and when the aerosol-generating substrate is pulled out by users, the aerosol-generating substrate may be scratched or residues may be left on the heater due to adhesion between contact parts of the aerosol-generating substrate and the heater, compromising the heating effect in subsequent use, for example, producing a smell of scorching.SUMMARY

[0004] The technical issue to be settled by the invention is to provide an improved aerosol generating device to overcome the above-mentioned defects in the prior art.

[0005] The technical solution that the present invention adopts to resolve the technical issues is to provide an aerosol generating device comprising a body portion, an extractor slidably sleeved on the body portion and having a receiving space for receiving an aerosol-generating substrate, and a heating unit arranged in the body portion and having an end being capable of extending into the receiving space.

[0006] The extractor comprises an elastic assembly; when the extractor and the body portion are in a connected state, the aerosol-generating substrate is located at a first position where the aerosol-generating substrate can be heated by the heating unit; when the extractor and the body portion are in a separated state, at least part of the heating unit retracts from the receiving space and the aerosol-generating substrate is located at a second position where at least part of the aerosol-generating substrate is separated from the heating unit; and the elastic assembly is configured to change a length of the receiving space when changing the extractor and the body portion from the connected state to the separated state.

[0007] In some embodiments, the extractor comprises a top cover, a fixed tube fixedly connected to the top cover and a movable tube slidably disposed inside or outside the fixed tube, and inner walls of the fixed tube and the movable tube cooperatively define the receiving space.

[0008] In some embodiments, two ends of the elastic assembly are connected to the fixed tube and the movable tube respectively.

[0009] In some embodiments, a limit structure is arranged on the fixed tube and the movable tube.

[0010] In some embodiments, the limit structure comprises a first limit protrusion formed on the fixed tube and a second limit protrusion located above the first limit protrusion and formed on the movable tube, and two ends of the elastic assembly abut against the first limit protrusion and the second limit protrusion respectively.

[0011] In some embodiments, a limit and guide structure is formed between the fixed tube and the movable tube and is used for guiding sliding of the movable tube and limiting circumferential movement of the movable tube relative to the fixed tube.

[0012] In some embodiments, the limit and guide structure comprises a guide groove and a guide protrusion in sliding fit with the guide groove, and two circumferential sides of the guide protrusion are in sliding and contact fit with two circumferential sides of the guide groove respectively.

[0013] In some embodiments, the movable tube is slidably arranged inside the fixed tube.

[0014] In some embodiments, the fixed tube comprises an outer tube, an inner diameter of the outer tube is greater than an outer diameter of the movable tube, the movable tube is slidably arranged in the outer tube, and the elastic assembly is arranged between an inner wall of the outer tube and an outer wall of the movable tube.

[0015] The fixed tube further comprises an inner tube arranged in the outer tube; and the movable tube comprises a first tube section, and the inner tube separably abuts against an upper surface of the first tube section.

[0016] In some embodiments, the movable tube further comprises a second tube section extending upwards from the first tube section, an inner diameter and an outer diameter of the second tube section are greater than an inner diameter and an outer diameter of the first tube section respectively, and the second tube section is slidably arranged between the inner tube and the outer tube,and / or

[0017] An inner diameter of the inner tube is in consistent with that of the first tube section.

[0018] In some embodiments, the movable tube is slidably sleeved on outside of the fixed tube, and the elastic assembly is arranged between an inner wall of the movable tube and an outer wall of the fixed tube.

[0019] In some embodiments, a guide portion is formed at an upper end of the body portion, the top cover is slidably sleeved on outside of the guide portion and is in sliding and contact fit with the guide portion, and when the top cover is in sliding and contact fit with the guide portion, the aerosol-generating substrate is located at the first position; when the top cover is not in sliding and contact fit with the guide portion, the aerosol-generating substrate is located at the second position; and an axial length of the guide portion is less than or equal to a maximum sliding distance of the movable tube with respect to the fixed tube.

[0020] In some embodiments, the aerosol generating device further comprises a hood formed by an upward extension of the guide portion, the hood is arranged between the top cover and the fixed tube and spaced apart from an inner wall of the top cover and the outer wall of the fixed tube.

[0021] In some embodiments, the movable tube comprises a bottom wall, and an aperture is formed in the bottom wall to allow the heating unit to pass through.

[0022] The bottom wall is used for supporting the aerosol-generating substrate inserted into the receiving space and is capable of pushing the aerosol-generating substrate to move to be separated from the heating unit.

[0023] In some embodiments, a shape of the aperture corresponds to a cross-sectional shape of the heating unit, and the heating unit is in clearance fit with the aperture.

[0024] In some embodiments, the heating unit is flake-like or rod-like.

[0025] In some embodiments, the heating unit is a resistor heating unit or an electromagnetic heating unit.

[0026] The invention has at least the following beneficial effects: after the extractor and the body portion are connected, the heating unit can heat the aerosol-generating substrate; after the extractor is separated from the body portion, the heating unit can be separated from the aerosol-generating substrate, and the aerosol-generating substrate can be easily and quickly taken out of the aerosol generating device without being damaged, thus preventing residues generated by the aerosol-generating substrate from being left in the aerosol generating device.BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The invention will be further described below in conjunction with accompanying drawings and embodiments. In the drawings: FIG. 1 is a perspective view of an aerosol generating device into which an aerosol-generating substrate is inserted according to a first embodiment of the invention; FIG. 2 is an exploded view of the aerosol generating device in FIG. 1; FIG. 3 is an exploded view of an extractor in FIG. 2; FIG. 4 is a cross-sectional view, showing a top cover and a body portion of the aerosol generating device in FIG. 1 being in a connected state; FIG. 5 is a cross-sectional view, showing the top cover and the body portion of the aerosol generating device in FIG. 1 being just separated; FIG. 6 is a cross-sectional view, showing an aerosol-generating substrate and a heating unit of the aerosol generating device in FIG. 1 being separated; and FIG. 7 is a cross-sectional view, showing a top cover and a body portion of an aerosol generating device according to a second embodiment of the invention being in a connected state. DESCRIPTION OF THE EMBODIMENTS

[0028] For facilitating understanding of the technical features, purposes and effects of the invention, a detailed description of embodiments of the present invention with reference to the accompanying drawings is provided.

[0029] FIG. 1-FIG. 6 illustrate an aerosol generating device 100 according to a first embodiment of the invention. The aerosol generating device 100 is used for braking and heating an aerosol-generating substrate 200 inserted therein at a low temperature to release aerosol extractive matter from the aerosol-generating substrate in a HNB state. The aerosol-generating substrate 200 may be cylindrical and comprise an aerosol generating section section 201 containing a solid matrix of plant leaves. Further, the aerosol-generating substrate 200 may further comprise a hollow support section 202, a cooling section 203 and a filter section 204 which are sequentially arranged above the aerosol generating section section 201 in a longitudinal direction. The aerosol generating device 100 is approximately in a rectangular column shape, and an opening 210 matching the aerosol-generating substrate 200 in shape and size is formed in the top of the aerosol generating device 100. It can be understood that the aerosol generating device 100 is not limited to the rectangular column shape, and may also be in other shapes such as a cylinder shape and a cylindroid shape.

[0030] The aerosol generating device 100 may comprise a main part 1 and an extractor 2 detachably arranged above the main part 1 in the longitudinal direction. Wherein, a receiving space 220 for receiving the aerosol-generating substrate 200 is formed in the extractor 2, and the aerosol-generating substrate 200 is inserted into the receiving space 220 via the opening 210. The main part 1 may comprise a body portion 11, a heating unit 14 arranged on the body portion 11, a mainboard 16 arranged in the body portion 11, and a battery 17 arranged in the body portion 11. The mainboard 16 is electrically connected to the battery 17 and the heating unit 14. Related control circuits are arranged on the mainboard 16, and the mainboard 16 can be started by means of a switch 19 arranged on the body portion 11 to control the battery 17 to supply power to the heating unit 14. An upper end of the heating unit 14 can extend into the receiving space 220 and be inserted into the aerosol-generating substrate 200 to be in close contact with the aerosol-generating substrate 200. Heat generated after the heating unit 14 is powered on can be transmitted to the aerosol-generating substrate 200 to bake and heat the aerosol-generating substrate 200. The heating unit 14 may be a resistor heating unit, or a metal induction heating unit capable of generating heat in a variable magnetic field. The heating unit 14 may be flake-like or rod-like. The upper end of the heating unit 14 may be provided with a sharp guide structure to be easily inserted into the aerosol-generating substrate 200.

[0031] The extractor 2 may comprise a top cover 21 detachably disposed around the body portion 11, a receiving assembly 22 arranged in the top cover 21, and an elastic assembly 23 arranged in the top cover 21. When the extractor 2 and the body portion 11 are in a connected state, the aerosol-generating substrate 200 is located at a first position where the aerosol-generating substrate 200 can be heated by the heating unit 14. When the extractor 2 and the body portion 11 are in a separated state, at least part of the heating unit 14 retracts from the receiving space 220 to and the aerosol-generating substrate 200 is located at a second position where at least part of the aerosol-generating substrate 200 is separated from the heating unit 14. The elastic assembly 23 is configured to change the length of the receiving space 220 when changing the extractor 2 and the body portion 11 from the connected state to the separated state.

[0032] Specifically, the receiving assembly 22 may comprise a fixed tube 221 fixedly connected to the top cover 21 and a movable tube 222 located below the fixed tube 221 and slidably arranged inside or outside the fixed tube 221, and the fixed tube 221 and the movable tube 22 cooperatively define the receiving space 220. The movable tube 222 is slidably sleeved on a lower portion of the fixed tube 221 in the longitudinal direction and may be coaxial with the fixed tube 221. The movable tube 222 comprises a bottom wall 2221, the bottom wall 2221 may be used for supporting the aerosol-generating substrate 200, and the aerosol-generating substrate 200 may be inserted into the receiving space 220 via the opening 210 and abut against the bottom wall 2221. An aperture 2220 allowing the heating unit 14 to extend through is formed in the bottom wall 2221, the shape of the aperture 2220 may correspond to the cross-sectional shape of the heating unit 14, and the cross-sectional dimension of the aperture 2220 may be slightly greater than that of the heating unit 14, such that the heating unit 14 is in clearance fit with the aperture 2220 and can be easily inserted into and retract from the aperture 2220, and when the heating unit 14 is separated from the aerosol-generating substrate 200, the bottom wall 2221 can remove residual substances from the heating unit 14 by means of the frictional to clean the heating unit 14. In this embodiment, the heating unit 14 is flake-like, the cross-sectional dimension of the aperture 2220 is slightly greater than that of the heating unit 14, and the cross-sectional shape of the aperture 2220 is rectangular. A lower end of the heating unit 14 may be inlaid in a heating base 15 and be inserted into the top of the body portion 11 by means of the heating base 15.

[0033] The fixed tube 221 may be fixedly connected to an inner side of the top of the top cover 21 threadedly, magnetically, through buckles or in other manners, and the movable tube 222 is slidably arranged inside the fixed tube 221. In other embodiments, the fixed tube 221 and the top cover 21 may be formed integrally. For example, the inner side of the top of the top cover 21 may integrally extend downwards in the longitudinal direction to form the fixed tube 221. Matched limit structures may be arranged on the fixed tube 221 and the movable tube 222 to prevent the fixed tube 221 and the movable tube 222 from being separated from each other in the sliding process. In some embodiments, the limit structures may comprise a first limit protrusion 2213 formed by an inward extension of an inner wall of the fixed tube 221 in a radial direction and a second limit protrusion 2223 located above the first limit protrusion 2213 and formed by an outward extension of an outer wall of the movable tube 222 in the radial direction. Two ends of the elastic assembly 23 are connected to the fixed tube 221 and the movable tube 222 respectively, an upper end of the elastic assembly 23 may abut against the second limit protrusion 2223, and a lower end of the elastic assembly 23 may abut against the first limit protrusion 2213. The elastic assembly 23 can prevent the movable tube 222 from moving when the aerosol-generating substrate 200 is not inserted into the receiving assembly 22.

[0034] In some embodiments, the fixed tube 221 may comprise an outer tube 2211 and an inner tube 2212 fitted into the outer tube 2211. The movable tube 222 is slidably fitted in the outer tube 2211, and a lower end of the outer tube 2211 extends inw ards in the radial direction to form the first limit protrusion 2213. The inner diameter of the outer tube 2211 may be greater than the outer diameter of the inner tube 2212.

[0035] In some embodiments, the movable tube 222 may comprise a first tube section 2222 and a second tube section 2224 located above the first tube section 2222 and connected to the first tube section 2222. The second tube section 2224 is slidably arranged between the outer tube 2211 and the inner tube 2212. The outer diameter of the second tube section 2224 is greater than the outer diameter of the first tube section 2222 and matches the inner diameter of the outer tube 2211, that is, an outer wall of the second tube section 2224 is in sliding and contact fit with an inner wall of the outer tube 2211. A step surface formed between the second tube section 2224 and the first tube section 2222 forms the second limit protrusion 2223. A mounting space allowing the elastic assembly 23 to be mounted therein is formed between the inner wall of the outer tube 2211 and the outer wall of the first tube section 2222. The elastic assembly 23 may be a spring and disposed between the inner wall of the outer tube 2211 and the outer wall of the first tube section 2222.

[0036] The inner diameter of the first tube section 2222 may be equal to or approximately equal to the inner diameter of the inner tube 2212, and the first tube section 2222 is arranged below the inner tube 2212 in an axial direction. The inner diameter of the second tube section 2224 matches the outer diameter of the inner tube 2212, that is, an outer wall of the inner tube 2212 may be in sliding and contact fit with an inner wall of the second tube section 2224. At least one limit and guide structure is arranged on the second tube section 2224 and the inner tube 2212 respectively and is used for guiding sliding of the movable tube 222 and limiting circumferential movement of the movable tube 222 relative to the inner tube 2212. In this embodiment, there are two limit and guide structures which are located on two opposite sides of the receiving space 220 respectively. The limit and guide structure may comprise a guide groove 2225 extending in the longitudinal direction and a guide protrusion 2214 in sliding fit with the guide groove 2225. Specifically, in this embodiment, the guide groove 2225 extends through the second tube section 2224 and extends from the top of the second tube section 2224 approximately to the bottom of the second tube section 2224, and the guide protrusion 2214 is formed by an outward extension of the outer wall of the inner tube 2212. There may be two guide protrusions 2214 which are in sliding and contact fit with two circumferential sides of the guide groove 2225 respectively. The axial length of the guide groove 2225 is greater than the maximum sliding distance of the movable tube 222 with respect to the fixed tube 221, such that the guide protrusion 2214 is prevented from disengaging from the guide groove 2225 when the top cover 21 is separated from the body portion 11. In other embodiments, there may be only one guide protrusion 2214, and two circumferential sides of the guide protrusion 2214 are in sliding and contact fit with two circumferential sides of the guide groove 2225 respectively.

[0037] A guide portion 181 is formed at an upper end of the body portion 11, a lower end of the top cover 21 is slidably sleeved on the guide portion 181, an inner wall of the top cover 21 is in sliding and contact fit with an inner wall of the guide portion 181, and the guide portion 181 can fulfill a guide effect in the process of changing the top cover 21 and the body portion 11 from the connected state to the separated state. When the top cover 21 and the guide portion 181 are in sliding and contact fit, the aerosol-generating substrate 200 is located at the first position where it is heated by the heater 14. When the top cover 21 and the guide portion 181 are not in sliding and contact fit, the aerosol-generating substrate 200 is located at the second position where at least part of the aerosol-generating substrate 200 is separated from the heating unit 14. An axial height H0 of the guide portion 181 is less than or equal to the maximum sliding distance of the movable tube 222 with respect to the fixed tube 221. In this embodiment, the axial height H0 of the guide portion 181 is equal to the maximum sliding distance of the movable tube 222 with respect to the fixed tube 221. The top of the guide portion 181 may extend upwards to form a hood 182, and the hood 182 covers the heating unit 14 and can protect the heating unit 14 against damage caused by horizontal movements of the top cover 21 when the top cover 21 and the body portion 11 are connected. The hood 182 is arranged between the top cover 21 and the outer tube 2211 and is spaced apart from the inner wall of the top cover 21 and the outer wall of the outer tube 2211. Specifically, the guide portion 181 and the hood 182 are both hollow cylinders and are connected, the cross-sectional dimension of an outer side of the guide portion 181 is greater than the cross-sectional dimension of an outer side of the hood 182 and corresponds to the cross-sectional dimension of an inner side of the top cover 21, that is, the cross-sectional dimension of the outer side of the hood 182 is less than the cross-sectional dimension of the inner side of the top cover 21. A support arm 183 may be formed in the guide portion 181, and an upper surface of the support arm 183 may support the receiving assembly 22 or be spaced apart from a lower surface of the receiving assembly 22. A lower surface of the support arm 183 may abut against the heating base 15 to fix the heating base 15.

[0038] As shown in FIG. 4, the top cover 21 and the body portion 11 are connected, and in this case, the top cover 21 is sleeved on outside of the guide portion 181 and is in contact with the guide portion 181, a matching height of the lower end of the top cover 21 and the guide portion 181 is equal to the axial height H0 of the guide portion 181, a lower surface of the top cover 21 abuts against an upper surface of the body portion 11, and the upper end of the heating unit 14 extends through the bottom wall 2221 of the movable tube 222 to be inserted into the receiving assembly 22. The elastic assembly 23 is in a semi-compressed state to allow the upper surface of the movable tube 222 to elastically abut against a lower surface of the inner tube 2212 to prevent the movable tube 222 from shaking. When the device is not used, that is, when the aerosol-generating substrate 200 is not inserted into the receiving assembly 22, the total length of the receiving assembly 22 is called as an initial length L0 (i.e., the sum of the length of the inner tube 2212 and the length of the movable tube 222).

[0039] When users want to inhale, the aerosol-generating substrate 200 is inserted into the receiving assembly 22, the heating unit 14 penetrates into the bottom of the aerosol-generating substrate 200, the bottom of the aerosol-generating substrate 200 abuts against the bottom wall 2221 of the movable tube 222, and the heating unit 14 is powered on to bake and heat the aerosol-generating substrate 200. In the process of inserting the aerosol-generating substrate 200 into the receiving assembly 22, the insertion force applied to the aerosol-generating substrate 200 is small and will not push the movable tube 222 to move downwards, and thus, the total length of the receiving assembly 22 is maintained in the initial length L0. When a large insertion force is applied to the aerosol-generating substrate 200, the aerosol-generating substrate 200 may push the bottom wall 2221 of the movable tube 222 to drive the movable tube 222 to move downwards slightly, and the total length of the receiving assembly 22 will be slightly increased and then return to the initial length L0.

[0040] After the aerosol-generating substrate 200 is heated, the top cover 21 can be pulled to move upwards away from the body portion 11. When the top cover 21 moves upwards, the matching height of the lower end of the top cover 21 and the guide portion 181 decreases gradually on one hand; on the other hand, the fixed tube 221 moves upwards with the top cover 21, the movable tube 222 and the aerosol-generating substrate 200 do not move, the first limit protrusion 2213 of the fixed tube 221 moves upwards to further compress the elastic assembly 23, the total length of the receiving assembly 22 increases gradually, and there is no relative movement between the aerosol-generating substrate 200 and the heating unit 14. As shown in FIG. 5, when the top cover 21 and the body portion 11 are just separated from each other, the lower end of the top cover 21 is just separated from the guide portion 181, that is, the top cover 21 moves with respect to the guide portion 181 by H0, the fixed tube 221 slides with respect to the movable tube 222 by H0, and the total length of the receiving assembly 22 changes from L0 to L0+H0. As shown in FIG. 6, when the top cover 21 continue to move upwards the movable tube 222 will move upwards with the top cover 21,the bottom wall 2221 of the movable tube 222 pushes the aerosol-generating substrate 200 to move upwards to be separated from the heating unit 14.

[0041] A dust cover 25 for covering or uncovering the opening 210 may be arranged at the top of the top cover 21. When the aerosol generating device 100 is not used, the dust cover 25 can be pushed to cover the opening 210 to prevent dust from entering the opening 210. When the aerosol generating device 100 is used, the dust cover 25 can be pushed to uncover the opening 210 to allow the aerosol-generating substrate 200 to be inserted into the aerosol generating device 100 via the opening 210.

[0042] FIG. 7 illustrates an aerosol generating device 100 according to a second embodiment of the invention, which differs from the aerosol generating device 100 in the first embodiment mainly in that, in this embodiment, the movable tube 224 is slidably sleeved on outside of the fixed tube 223. Correspondingly, in this embodiment, the elastic assembly 23 is arranged between the inner wall of the movable tube 224 and the outer wall of the fixed tube 223. The first limit protrusion 2231 abutting against the lower end of the elastic assembly 23 may be formed by an outward extension of the outer wall of the fixed tube 223 in the radial direction, and the second limit protrusion 2243 abutting against the upper end of the elastic assembly 23 may be formed by an inward extension of the inner wall of the movable tube 224 in the radial direction.

[0043] Specifically, in this embodiment, the movable tube 224 may comprise a first tube section 2241 and a second tube section 2242 located above the first tube section 2241. The outer diameter and inner diameter of the second tube section 2242 may be respectively greater than the outer diameter and inner diameter of the first tube section 2241. The fixed tube 223 is slidably arranged in the second tube section 2242, and the lower end of the fixed tube 223 separably abuts against a step surface formed between the second tube section 2242 and the first tube section 2241. The inner diameter of the fixed tube 223 may be the same as that of the first tube section 2241, such that when the top cover 21 and the body portion 11 are connected, inner walls of the receiving space 220 are in smooth transition. The inner diameter of the second tube section 2242 is greater than that of the fixed tube 223, and the elastic assembly 23 is arranged between the inner wall of the second tube section 2242 and the outer wall of the fixed tube 223. The first limit protrusion 2231 may be formed by an outward extension of the outer wall of the lower end of the fixed tube 223 in the radial direction, and the second limit protrusion 2243 may be formed by an inward extension of the inner wall of the upper end of the second tube section 2242 in the radial direction.

[0044] It can be understood that the above technical features can be freely combined for use without limitation.

[0045] The above embodiments merely illustrate specific implementations of the invention, and are specifically described in detail, but they should not be construed as limitations of the patent scope of the invention. It should be pointed out that those ordinarily skilled in the art can freely combine the above technical features and make some transformations and improvements without departing from the concept of the invention, and all these combinations, transformations and improvements should fall within the protection scope of the invention. Therefore, all equivalent transformations and modifications made according to the scope of the claims of the invention should fall within the scope of the claims of the invention.

Claims

1. An aerosol generating device, <b>characterized by comprising a body portion, an extractor slidably sleeved on the body portion and having a receiving space for receiving an aerosol-generating substrate, and a heating unit arranged in the body portion and having an end being capable of extending into the receiving space, wherein: the extractor comprises an elastic assembly; when the extractor and the body portion are in a connected state, the aerosol-generating substrate is located at a first position where the aerosol-generating substrate can be heated by the heating unit; when the extractor and the body portion are in a separated state, at least part of the heating unit retracts from the receiving space and the aerosol-generating substrate is located at a second position where at least part of the aerosol-generating substrate is separated from the heating unit; and the elastic assembly is configured to change a length of the receiving space when changing the extractor and the body portion from the connected state to the separated state.

2. The aerosol generating device according to Claim 1, characterized in that the extractor comprises a top cover, a fixed tube fixedly connected to the top cover and a movable tube slidably disposed inside or outside the fixed tube, and inner walls of the fixed tube and the movable tube cooperatively define the receiving space.

3. The aerosol generating device according to Claim 2, characterized in that two ends of the elastic assembly are connected to the fixed tube and the movable tube respectively.

4. The aerosol generating device according to Claim 2, characterized in that a limit structure is arranged on the fixed tube and the movable tube.

5. The aerosol generating device according to Claim 4, characterized in that the limit structure comprises a first limit protrusion formed on the fixed tube and a second limit protrusion located above the first limit protrusion and formed on the movable tube, and two ends of the elastic assembly abut against the first limit protrusion and the second limit protrusion respectively.

6. The aerosol generating device according to Claim 2, characterized in that a limit and guide structure is formed between the fixed tube and the movable tube.

7. The aerosol generating device according to Claim 6, characterized in that the limit and guide structure comprises a guide groove and a guide protrusion in sliding fit with the guide groove, and two circumferential sides of the guide protrusion are in sliding and contact fit with two circumferential sides of the guide groove respectively.

8. The aerosol generating device according to Claim 2, characterized in that the movable tube is slidably arranged inside the fixed tube.

9. The aerosol generating device according to Claim 8, characterized in that the fixed tube comprises an outer tube, an inner diameter of the outer tube is greater than an outer diameter of the movable tube, the movable tube is slidably arranged in the outer tube, and the elastic assembly is arranged between an inner wall of the outer tube and an outer wall of the movable tube.

10. The aerosol generating device according to Claim 9, characterized in that the fixed tube further comprises an inner tube arranged in the outer tube; and the movable tube comprises a first tube section, and the inner tube separably abuts against an upper surface of the first tube section.

11. The aerosol generating device according to Claim 10, characterized in that the movable tube further comprises a second tube section extending upwards from the first tube section, an inner diameter and an outer diameter of the second tube section are greater than an inner diameter and an outer diameter of the first tube section respectively, and the second tube section is slidably arranged between the inner tube and the outer tube.

12. The aerosol generating device according to Claim 10, characterized in that an inner diameter of the inner tube is in consistent with that of the first tube section.

13. The aerosol generating device according to Claim 2, characterized in that the movable tube is slidably sleeved on outside of the fixed tube, and the elastic assembly is arranged between an inner wall of the movable tube and an outer wall of the fixed tube.

14. The aerosol generating device according to any one of Claims 2-13, characterized in that a guide portion is formed at an upper end of the body portion, the top cover is slidably sleeved on outside of the guide portion and is in sliding and contact fit with the guide portion, and when the top cover is sliding and contact fit with the guide portion, the aerosol-generating substrate is located at the first position; when the top cover is not in sliding and contact fit with the guide portion, the aerosol-generating substrate is located at the second position; and an axial length of the guide portion is less than or equal to a maximum sliding distance of the movable tube with respect to the fixed tube.

15. The aerosol generating device according to Claim 14, characterized in that the aerosol generating device further comprises a hood formed by an upward extension of the guide portion, the hood is arranged between the top cover and the fixed tube and spaced apart from an inner wall of the top cover and the outer wall of the fixed tube.

16. The aerosol generating device according to any one of Claims 2-13, characterized in that the movable tube comprises a bottom wall, and an aperture is formed in the bottom wall to allow the heating unit to pass through.

17. The aerosol generating device according to Claim 16, characterized in that a shape of the aperture corresponds to a cross-sectional shape of the heating unit, and the heating unit is in clearance fit with the aperture.

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