smoke filtration device

Abstract

This application discloses a smoke filtration device, comprising: a housing having an airflow channel, an air inlet corresponding to the airflow channel's inlet end, and an air outlet corresponding to the airflow channel's outlet end; a first filter module disposed within the airflow channel; and a second filter module disposed within the airflow channel, located upstream of the first filter module, wherein the filtration accuracy of the second filter module is lower than that of the first filter module. This application employs a staged filtration method to filter smoke, avoiding the need for the high-precision first filter module to simultaneously filter both large and small aerosol particles, thereby improving the product's lifespan.

Description

Technical Field

[0001] This application relates to the field of smoke filtration technology, and in particular to a smoke filtration device. Background Technology

[0002] The smoke exhaled by smokers typically contains harmful substances such as nicotine, tar, and carbon monoxide, which can cause distress and harm to non-smokers in the surrounding environment. To address this, relevant technologies have proposed smoke filtering devices for filtering the smoke exhaled by smokers. Specifically, smokers exhale smoke into the smoke filtering device, where a filter element reduces the amount of harmful substances in the smoke entering the smoker's surrounding environment.

[0003] However, traditional smoke filtration devices still have the following problems: 1. The filter element is usually made of a high-precision filter screen, which makes the filter element easy to be blocked by large aerosol particles, resulting in a short service life of the smoke filtration device; 2. Smoke exhaled into the smoke filtration device by the user is prone to backflow, causing some smoke (backflow smoke) to overflow into the surrounding environment through the air inlet of the smoke filtration device without being filtered by the filter element; 3. Filtering smoke only through the filter screen is not ideal. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a smoke filtration device that employs a staged filtration method to filter smoke, which helps to improve the product's service life.

[0005] A smoke filtration device according to an embodiment of this application includes:

[0006] The housing has an airflow channel inside, an air inlet is provided on the housing corresponding to the air inlet end of the airflow channel, and an air outlet is provided on the housing corresponding to the air outlet end of the airflow channel.

[0007] A first filtration module, wherein the first filtration module is disposed within the airflow channel; and...

[0008] The second filter module is disposed within the airflow channel and is located upstream of the first filter module. The filtration accuracy of the second filter module is lower than that of the first filter module.

[0009] The smoke filtering device according to the embodiments of this application has at least the following beneficial effects: During use, the user exhales smoke into the air inlet. The smoke enters the airflow channel through the air inlet and flows sequentially through the second filter module and the first filter module for filtration. The filtered smoke is then discharged through the air outlet. Specifically, since the filtration accuracy of the second filter module is lower than that of the first filter module, the second filter module is used to filter larger aerosol particles in the smoke. The smoke entering the airflow channel is first filtered by the second filter module, allowing the first filter module to filter only smaller aerosol particles. Compared to traditional smoke filtering devices where high-precision filter elements need to filter both large and small aerosol particles simultaneously, this application uses a staged filtration method to filter smoke, avoiding the need for the high-precision first filter module to filter both large and small aerosol particles simultaneously, thereby improving the product's lifespan.

[0010] According to some embodiments of this application, a partition is provided between the first filter module and the second filter module, and an air vent is provided at the edge of the partition for allowing smoke to flow to the first filter module.

[0011] According to some embodiments of this application, the first filter module includes a sheet-like filter element, at least a portion of which is bent.

[0012] According to some embodiments of this application, the filter element is made of micron-sized glass fiber filter mesh.

[0013] According to some embodiments of this application, the second filter module includes a baffle that blocks the air outlet of the air inlet. The baffle is provided with a plurality of filter holes for filtering aerosol particles in the smoke at intervals, and the pore diameter of the filter holes is 0.5 mm to 3 mm.

[0014] According to some embodiments of this application, the second filtering module further includes a flow-blocking structure located downstream of the baffle.

[0015] According to some embodiments of this application, the flow-blocking structure includes a substrate and a first blocking portion. A plurality of first blocking portions for blocking smoke are spaced apart on the substrate, and a first gap for smoke to pass through is provided between two adjacent first blocking portions.

[0016] According to some embodiments of this application, the flow-blocking structure further includes a second blocking portion disposed on the substrate, and a second blocking portion for blocking smoke is disposed downstream of each of the first gaps. The second blocking portions are spaced apart from the first blocking portions, and a second gap for smoke to pass through is provided between two adjacent second blocking portions.

[0017] According to some embodiments of this application, in two adjacent first blocking portions, one of the first blocking portions is inclined, and the inclined first blocking portion is used to guide smoke downstream of itself.

[0018] According to some embodiments of this application, at least a portion of the second blocking portion is formed with a liquid collection tank.

[0019] According to some embodiments of this application, the side of the second filter module is provided with oil-absorbing cotton, which at least covers the flow-blocking structure.

[0020] According to some embodiments of this application, the housing is provided with an air nozzle for expelling smoke into the air inlet, at least a portion of the air nozzle being a movable part, the movable part being configured to connect or disconnect the air passage between the external atmosphere and the air inlet.

[0021] According to some embodiments of this application, the housing is provided with an installation channel communicating with the air inlet, the air inlet end of the air inlet is formed on the inner side wall of the installation channel, the air nozzle is movably disposed in the installation channel, the air nozzle can move to its own air outlet end docking with the air inlet end of the air inlet, and the air nozzle can also move to its own outer side wall to block the air inlet end of the air inlet.

[0022] According to some embodiments of this application, the housing is provided with a clearance opening communicating with the installation channel, and the side of the air nozzle is provided with a toggle part movably disposed in the clearance opening. The toggle part is used to drive the air nozzle to slide or rotate in the installation channel under the drive of an external force.

[0023] According to some embodiments of this application, the air inlet end of the air inlet is provided with an elastic seal with an annular cross-section. One end of the elastic seal facing the installation channel abuts against the outer wall of the air nozzle, and the elastic seal is always in a state of being squeezed by the outer wall of the air nozzle.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the structure of a smoke filtration device according to an embodiment of this application;

[0027] Figure 2 This is an exploded view of a smoke filtering device according to an embodiment of this application;

[0028] Figure 3 yes Figure 2 The diagram shown is a cross-sectional view of the structure after the first filter module, the second filter module, and the oil-absorbing cotton are hidden.

[0029] Figure 4 This is a cross-sectional view of the smoke filter device according to an embodiment of this application, where the nozzle slides to the point where its outlet end aligns with the inlet end of the inlet.

[0030] Figure 5 yes Figure 4 Enlarged view of a portion of point A in the middle;

[0031] Figure 6 This is a cross-sectional schematic diagram of a smoke filter device according to an embodiment of this application, showing the air nozzle sliding to its own outer wall to block the air inlet end.

[0032] Figure label:

[0033] First installation space a, second installation space b, first gap c, second gap d;

[0034] Housing 100, air inlet 110, air outlet 120, partition 130, vent 140, installation channel 150, clearance opening 160;

[0035] First filtration module 200, filter element 210;

[0036] The second filtration module 300, baffle 310, filter hole 311, substrate 320, first blocking part 321, second blocking part 322, and liquid collection tank 3221;

[0037] Oil-absorbing cotton 400;

[0038] Air nozzle 500;

[0039] Actuator 600;

[0040] 700 elastic seal. Detailed Implementation

[0041] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] In the description of this application, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] In the description of this application, if words such as several, greater than, less than, exceeding, above, below, or within appear, "several" means one or more, "more than" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, and "above," "below," "within," etc. are understood to include the number itself.

[0044] In the description of this application, the use of terms such as "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0045] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0046] Reference Figures 1 to 6 The smoke filtering device according to an embodiment of this application includes a housing 100, a first filter module 200, and a second filter module 300.

[0047] Specifically, the housing 100 has an airflow channel, an air inlet 110 is provided on the housing 100 at the air inlet end corresponding to the airflow channel, and an air outlet 120 is provided on the housing 100 at the air outlet end corresponding to the airflow channel. The first filter module 200 is disposed in the airflow channel and is used to filter aerosol particles in the smoke. The second filter module 300 is disposed in the airflow channel. The second filter module 300 is located upstream of the first filter module 200 and is used to filter aerosol particles in the smoke. The filtration accuracy of the second filter module 300 is lower than that of the first filter module 200.

[0048] In use, the user exhales smoke into the air inlet 110. The smoke enters the airflow channel through the air inlet 110 and flows sequentially through the second filter module 300 and the first filter module 200 for filtration. The filtered smoke is then discharged through the air outlet 120. Specifically, because the filtration accuracy of the second filter module 300 is lower than that of the first filter module 200, the second filter module 300 is used to filter larger aerosol particles in the smoke. The smoke entering the airflow channel is first filtered by the second filter module 300, allowing the first filter module 200 to filter only smaller aerosol particles. Compared to traditional smoke filtration devices where high-precision filters need to simultaneously filter both large and small aerosol particles, this application uses a staged filtration method to filter smoke, avoiding the need for the high-precision first filter module 200 to simultaneously filter both large and small aerosol particles, thus improving the product's lifespan.

[0049] Specifically, the filtration accuracy of the second filter module 300 differs from that of the first filter module 200 by at least two to three orders of magnitude.

[0050] It should be noted that larger aerosol particles in smoke are more likely to deposit than smaller aerosol particles.

[0051] Reference Figure 3 , Figure 4 and Figure 6 In some embodiments, a partition 130 is provided between the first filter module 200 and the second filter module 300. An air vent 140 is provided at the edge of the partition 130 for allowing smoke to flow to the first filter module 200, meaning the first filter module 200 is blocked between the air vent 140 and the air outlet 120. When the smoke filtered by the second filter module 300 flows to the first filter module 200, it impacts the partition 130. The flow speed of the smoke impacting the partition 130 is slowed, and its flow direction is forced to change (towards the air vent 140). At this time, some aerosol particles in the smoke will deposit (adhere to the partition 130 or the inner wall of the airflow channel), thereby reducing the number of aerosol particles in the smoke flowing to the first filter module 200. This reduces the risk of the first filter module 200 becoming clogged, thus extending its service life and improving the product's smoke filtration effect.

[0052] Specifically, the partition 130 divides the airflow channel into a first installation space a and a second installation space b. The air inlet 110, the first installation space a, the second installation space b and the air outlet 120 are connected in sequence. The first filter module 200 is disposed in the second installation space b and the second filter module 300 is disposed in the first installation space a.

[0053] Reference Figure 2 , Figure 4 and Figure 6 In some embodiments, the first filter module 200 includes a sheet-like filter element 210, at least a portion of which is bent. This increases the area of ​​the filter element 210 used for filtering smoke within a limited second installation space b. Compared to an unbent filter element 210, this reduces the risk of the first filter module 200 becoming clogged when filtering the same amount of smoke, thereby extending the service life of the first filter module 200 and improving the product's smoke filtration effect.

[0054] In some embodiments, the filter element 210 is made of a micron-sized glass fiber filter mesh, that is, the filter element 210 is made of a glass fiber filter mesh with a pore size of micron, thereby enabling the filter element 210 to achieve a filtration accuracy of micron, thereby improving the product's filtration effect on smoke.

[0055] Reference Figures 4 to 6 In some embodiments, the second filter module 300 includes a baffle 310 that blocks the air outlet of the air inlet 110. The baffle 310 has a plurality of filter holes 311 spaced apart for filtering aerosol particles in the smoke. The pore diameter of the filter holes 311 is 0.5mm to 3mm, ensuring that the filter holes 311 can filter larger aerosol particles in the smoke without easily becoming clogged. Specifically, the pore diameter of the filter holes 311 can be 0.5mm, 3mm, 2mm, or other values ​​within the aforementioned range.

[0056] In some embodiments, the second filter module 300 further includes a flow-blocking structure located downstream of the baffle 310. The flow-blocking structure is used to slow down the flow velocity of smoke in the airflow channel, so that the smoke can be deposited when it flows through the flow-blocking structure. This reduces the aerosol particles in the smoke flowing to the first filter module 200, reduces the risk of the first filter module 200 being blocked, and thus extends the service life of the first filter module 200. At the same time, it can also improve the filtration effect of the product on smoke.

[0057] Specifically, the flow obstruction structure can be integrally formed on the baffle 310, integrally formed on the inner wall of the airflow channel, or connected to the baffle 310 or the inner wall of the airflow channel by a connecting structure (such as screws, snap-fit ​​structures, etc.), which is not limited here.

[0058] Reference Figures 4 to 6 In some embodiments, the flow-blocking structure includes a substrate 320 and a first blocking portion 321. The substrate 320 is provided with a plurality of first blocking portions 321 for blocking smoke at intervals. There is a first gap c between two adjacent first blocking portions 321 for smoke to pass through. When the smoke filtered by the filter hole 311 flows through the flow-blocking structure, some of the smoke will collide with the first blocking portion 321. The flow speed of the smoke that collides with the first blocking portion 321 will be slowed down. At the same time, the flow direction of the smoke that collides with the first blocking portion 321 is forced to change (flowing towards the first gap c). At this time, some aerosol particles in the smoke will be deposited (adhering to the first blocking portion 321 or the inner wall of the airflow channel), thereby reducing the aerosol particles in the smoke flowing to the first filter module 200.

[0059] Reference Figures 4 to 6 In some embodiments, the flow-blocking structure further includes a second blocking portion 322 disposed on the substrate 320. A second blocking portion 322 for blocking smoke is disposed downstream of each first gap c. The second blocking portions 322 are spaced apart from the first blocking portions 321, and a second gap d for smoke to pass through is provided between two adjacent second blocking portions 322. When the smoke filtered by the filter holes 311 flows through the flow-blocking structure, some of the smoke will collide with the second blocking portion 322 and flow back to form a swirling airflow. This not only further slows down the flow rate of the smoke, but also further causes aerosol particles in the smoke to be deposited (adhered to the second blocking portion 322 or the inner wall of the airflow channel), thereby further reducing the aerosol particles in the smoke flowing to the first filter module 200.

[0060] Reference Figures 4 to 6 In some embodiments, of the two adjacent first blocking portions 321, one of the first blocking portions 321 is inclined. The inclined first blocking portion 321 is used to guide the smoke downstream. When the smoke impacting the second blocking portion 322 flows back and forms a swirling airflow, this part of the smoke can flow downstream under the guiding action of the inclined first blocking portion 321. The second gap d, the gap between the second blocking portion 322 and the inclined first blocking portion 321, and the gap between the second blocking portion 322 and the inner wall of the airflow channel are all used to allow the smoke to flow downstream.

[0061] Reference Figures 4 to 6In some embodiments, at least a portion of the second blocking portion 322 is formed with a liquid collection groove 3221, so that when the smoke flows through the second blocking portion 322, the liquid aerosol particles in the smoke can be deposited in the liquid collection groove 3221, thereby helping to prevent the liquid aerosol particles in the smoke from accumulating at the filter element 210 and affecting the service life of the filter element 210.

[0062] Reference Figure 2 In some embodiments, the side of the second filter module 300 is provided with oil-absorbing cotton 400, which at least covers the flow-blocking structure, so that the oil-absorbing cotton 400 can adsorb at least a portion of the aerosol particles in the smoke flowing through the flow-blocking structure, especially the liquid aerosol particles in the smoke, and at the same time, can improve the product's filtration effect on smoke.

[0063] Specifically, a first blocking part 321 and a second blocking part 322 are provided on both sides of the substrate 320, and correspondingly, oil-absorbing cotton 400 is provided on both sides of the substrate 320.

[0064] It should be noted that in some other embodiments, the first blocking part 321 and the second blocking part 322 can also be replaced by a plurality of columnar protrusions or hemispherical protrusions disposed on the substrate 320. These protrusions can be distributed in a rectangular array or staggered, and are not limited here.

[0065] Reference Figures 1 to 4 as well as Figure 6 In some embodiments, the housing 100 is provided with an air nozzle 500 for expelling smoke into the air inlet 110. At least a portion of the air nozzle 500 is a movable part, configured to connect or disconnect the air passage between the outside atmosphere and the air inlet 110. In use, the air passage between the outside atmosphere and the air inlet 110 is connected through the movable part of the air nozzle 500, and then smoke is expelled into the air inlet 110 through the air nozzle 500. Subsequently, the air passage between the outside atmosphere and the air inlet 110 is disconnected through the movable part of the air nozzle 500, thereby helping to prevent unfiltered smoke expelled into the air inlet 110 from overflowing into the surrounding environment due to backflow.

[0066] In some embodiments, the air nozzle 500 is movably connected to the housing 100, and the air nozzle 500 has an open position and a closed position relative to the housing 100. The air nozzle 500 can be moved to the open position to connect the air passage between the outside atmosphere and the air inlet 110, and the air nozzle 500 can also be moved to the closed position to disconnect the air passage between the outside atmosphere and the air inlet 110.

[0067] Reference Figures 1 to 5In some embodiments, the housing 100 is provided with an installation channel 150 communicating with the air inlet 110. The air inlet end of the air inlet 110 is formed on the inner sidewall of the installation channel 150. The air nozzle 500 is movably disposed within the installation channel 150. The air nozzle 500 can move until its air outlet end aligns with the air inlet end of the air inlet 110. The air nozzle 500 can also move until its outer sidewall blocks the air inlet end of the air inlet 110. When it is necessary to expel smoke into the air inlet 110, the air nozzle 500 is moved until its air outlet end aligns with the air inlet end of the air inlet 110. At this time, the air nozzle 500 is in the open position. After expelling smoke into the air inlet 110 through the air nozzle 500, the air nozzle 500 is immediately moved until its outer sidewall blocks the air inlet end of the air inlet 110. At this time, the air nozzle 500 is in the closed position. Compared to blocking the air inlet of the nozzle 500 to prevent unfiltered smoke from overflowing due to backflow, blocking the air inlet of the inlet 110 can prevent unfiltered smoke from flowing back into the nozzle 500, thus confining the smoke within the airflow channel for filtration by the first filter module 200 and the second filter module 300.

[0068] Reference Figures 1 to 6 In some embodiments, the housing 100 is provided with a clearance opening 160 communicating with the mounting channel 150, and the side of the air nozzle 500 is provided with a toggle part 600 movably disposed in the clearance opening 160. The toggle part 600 is used to drive the air nozzle 500 to slide in the mounting channel 150 under the drive of external force, so that the air outlet end of the air nozzle 500 is connected with the air inlet end of the air inlet 110, or the outer wall of the air nozzle 500 blocks the air inlet end of the air inlet 110. This driving method is easy to implement and convenient for user operation.

[0069] It should be noted that in some other embodiments, the actuating part 600 is used to drive the air nozzle 500 to rotate within the mounting channel 150 under external force, so that the air outlet end of the air nozzle 500 is connected to the air inlet end of the air inlet 110, or the outer wall of the air nozzle 500 blocks the air inlet end of the air inlet 110. This driving method is also easy to implement and convenient for users to operate.

[0070] It should be noted that in some other embodiments, the user may also directly apply force to the physical part of the air nozzle 500 exposed outside the mounting channel 150, thereby driving the air nozzle 500 to slide or rotate within the mounting channel 150, in which case the aforementioned actuating part 600 is not required.

[0071] Reference Figures 1 to 6In some embodiments, the air inlet 110 is provided with an elastic seal 700 with an annular cross-section. One end of the elastic seal 700 facing the installation channel 150 abuts against the outer wall of the nozzle 500. The elastic seal 700 is always squeezed by the outer wall of the nozzle 500, which helps to prevent unfiltered smoke from overflowing through the installation channel 150 due to backflow.

[0072] Specifically, the solid part around the air intake end of the air intake port 110 (i.e., the inner wall of the mounting channel 150) is provided with a mounting groove corresponding to the elastic seal 700. The elastic seal 700 is partially embedded in the mounting groove. Of course, the elastic seal 700 can also be fixed to the air intake end of the air intake port 110 by screws, which is not limited here.

[0073] Specifically, the elastic seal 700 can be made of silicone or rubber, and there is no limitation on that.

[0074] In some embodiments, a reset member is provided between the nozzle 500 and the housing 100. The reset member is used to automatically reset the nozzle 500 from the open position to the closed position. When it is necessary to expel smoke into the air inlet 110, the nozzle 500 is moved to the open position and smoke is expelled into the air inlet 110. Subsequently, the nozzle 500 can automatically reset to the closed position under the action of the reset member, thereby simplifying the user's operation steps when using the product.

[0075] Specifically, the reset component can be a spring disposed between the air nozzle 500 and the housing 100, or a motor disposed on the housing 100 and connected to the air nozzle 500 for transmission; there is no limitation on this.

[0076] It should be noted that in some other embodiments, the air nozzle 500 can also be fixedly mounted on the housing 100. In this case, the air outlet end of the air nozzle 500 and the air inlet end of the air inlet 110 are always connected. The movable part of the air nozzle 500 is a sealing member that can be opened, closed or removed and is mounted on the air inlet end of the air nozzle 500. The sealing member is used to block the air inlet end of the air nozzle 500.

[0077] In some embodiments, the sealing element is a sliding cover, which can be slid to seal or release the air inlet of the air nozzle 500 when in use.

[0078] It should be noted that in some other embodiments, the sealing element is a flip cover. When in use, flipping the flip cover can seal the air inlet end of the air nozzle 500 or release the seal on the air inlet end of the air nozzle 500.

[0079] It should be noted that in some other embodiments, the sealing element is an elastic plug. When in use, the elastic plug is inserted into the air inlet of the air nozzle 500 to seal the air inlet of the air nozzle 500, and the air inlet of the air nozzle 500 is released by pulling out the elastic plug.

[0080] In the description of this specification, the use of terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A smoke filtering device, characterized in that, include: The housing has an airflow channel inside, an air inlet is provided on the housing corresponding to the air inlet end of the airflow channel, and an air outlet is provided on the housing corresponding to the air outlet end of the airflow channel. A first filtration module, wherein the first filtration module is disposed within the airflow channel; and... The second filter module is disposed within the airflow channel and is located upstream of the first filter module. The filtration accuracy of the second filter module is lower than that of the first filter module.

2. The smoke filtering device as described in claim 1, characterized in that, A partition is provided between the first filter module and the second filter module, and an air vent is provided at the edge of the partition for allowing smoke to flow to the first filter module.

3. The smoke filtering device as described in claim 1 or 2, characterized in that, The first filtration module includes a sheet-like filter element, at least a portion of which is bent.

4. The smoke filtering device as described in claim 3, characterized in that, The filter element is made of micron-sized glass fiber filter mesh.

5. The smoke filtering device as described in claim 1 or 2, characterized in that, The second filtration module includes a baffle that blocks the air outlet of the air inlet. The baffle is provided with a plurality of filter holes at intervals for filtering aerosol particles in the smoke. The pore diameter of the filter holes is 0.5 mm to 3 mm.

6. The smoke filtering device as described in claim 5, characterized in that, The second filtering module also includes a flow-blocking structure located downstream of the baffle.

7. The smoke filtering device as described in claim 6, characterized in that, The flow-blocking structure includes a substrate and a first blocking portion. The substrate is provided with a plurality of first blocking portions for blocking smoke at intervals, and there is a first gap between two adjacent first blocking portions for smoke to pass through.

8. The smoke filtering device as described in claim 7, characterized in that, The flow-blocking structure further includes a second blocking portion disposed on the substrate. A second blocking portion for blocking smoke is disposed downstream of each of the first gaps. The second blocking portions are distributed at intervals with the first blocking portions, and a second gap for smoke to pass through is provided between two adjacent second blocking portions.

9. The smoke filtering device as described in claim 8, characterized in that, Of the two adjacent first blocking sections, one of the first blocking sections is inclined, and the inclined first blocking section is used to guide the smoke downstream of itself.

10. The smoke filtering device as described in claim 8, characterized in that, At least a portion of the second blocking portion forms a liquid collection tank.

11. The smoke filtering device as claimed in claim 6, characterized in that, The second filter module has an oil-absorbing cotton on its side, which at least covers the flow-blocking structure.

12. The smoke filtering device as claimed in claim 1, characterized in that, The housing is provided with an air nozzle for expelling smoke into the air inlet. At least a portion of the air nozzle is a movable part, which is configured to connect or disconnect the air passage between the outside atmosphere and the air inlet.

13. The smoke filtering device as described in claim 12, characterized in that, The housing is provided with an installation channel communicating with the air inlet. The air inlet end of the air inlet is formed on the inner side wall of the installation channel. The air nozzle is movably disposed in the installation channel. The air nozzle can move to the point where its air outlet end connects with the air inlet end of the air inlet. The air nozzle can also move to its outer side wall to block the air inlet end of the air inlet.

14. The smoke filtering device as described in claim 13, characterized in that, The housing is provided with a clearance opening communicating with the installation channel, and the side of the air nozzle is provided with a toggle part that is movably disposed in the clearance opening. The toggle part is used to drive the air nozzle to slide or rotate in the installation channel under the drive of external force.

15. The smoke filtering device as described in claim 13, characterized in that, The air inlet is provided with an elastic seal with an annular cross-section at the air inlet end. The end of the elastic seal facing the installation channel abuts against the outer wall of the air nozzle, and the elastic seal is always in a state of being squeezed by the outer wall of the air nozzle.

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