Smoke filtering device

Abstract

The utility model provides a kind of smoke filtering device, including shell and air path switching assembly, shell inside is provided with filter component and respectively being arranged in the air passage of filter component two sides, the smoke to be filtered is from located one side air passage into shell interior, after the filtration of filter component, by located the air passage of other side discharge shell, air path switching assembly is movable in the inside of shell, and alternatively blocks air passage, to adjust the airflow path of at least one side air passage, so that the smoke to be filtered passes different filter components, or passes filter component from different direction, to reduce the aerosol residue on filter component, to further improve the filtering efficiency of smoke, while prolong the service life of filter component, reduce the use cost of smoke filtering device.

Description

Technical Field

[0001] This utility model relates to the field of electronic cigarette smoke treatment, specifically to a smoke filtering device. Background Technology

[0002] With the increasing popularity of e-cigarettes, the impact of the secondhand smoke (mainly aerosol particles) they produce on the surrounding environment and public health has gradually attracted attention.

[0003] In related technologies, filters are typically used to absorb aerosol particles from secondhand smoke. However, filters usually have a short lifespan because the accumulation of aerosol particles on the filter surface leads to excessive resistance, making it difficult to maintain filtration efficiency for secondhand smoke. This results in high operating costs for the filtration device and an inability to continuously and efficiently absorb secondhand smoke. Utility Model Content

[0004] In view of this, the present invention aims to provide a smoke filtering device to extend the service life of the filter and reduce the operating cost of the filtering device.

[0005] This utility model provides a smoke filtering device, comprising:

[0006] A housing, the interior of which is provided a filter assembly and air passages respectively disposed on both sides of the filter assembly; the air passage on one side allows the smoke to be filtered to enter the housing, and the air passage on the other side allows the filtered smoke to exit the housing; and

[0007] An air path switching assembly is movable inside the housing and can selectively block the air path passage to adjust the airflow path of the air path passage located on at least one side.

[0008] In some embodiments of this utility model, the gas path switching assembly includes a switching switch and a slider; a groove penetrating the housing is provided on the housing;

[0009] The switching switch is slidably connected to the slide groove and is used to drive the slider to move inside the housing; the slider is used to block or unblock the air passage.

[0010] In some embodiments of this utility model, the air passage located on one side is an air intake passage for the smoke to be filtered to enter, and the air passage located on the other side is an exhaust passage for the filtered smoke to be discharged.

[0011] The housing has at least two filter chambers inside, each of which is equipped with the filter assembly. Each filter chamber has a first airflow hole on the side near the air intake channel, and the first airflow hole is used to connect the filter chamber and the air intake channel.

[0012] At least two of the first airflow holes are arranged at intervals along the extension direction of the air intake channel; the other side of each of the filter chambers is connected to the exhaust channel;

[0013] The slider is disposed within the air intake channel and is movable along the extension direction of the air intake channel to selectively block the first airflow hole.

[0014] In some embodiments of this utility model, a second airflow hole is provided on the slider, and the second airflow hole extends through the slider along the extension direction of the air intake channel.

[0015] In some embodiments of this utility model, the switching switch has an off position and an on position;

[0016] When the switching switch is in the off position, the side wall of the slider blocks one of the first airflow holes, and the smoke to be filtered passes through the second airflow hole and enters the corresponding filter chamber through the other first airflow holes;

[0017] When the switch is in the open position, all the first airflow holes are at least partially open, and the smoke to be filtered enters the different filter chambers through the different first airflow holes.

[0018] In some embodiments of this utility model, a first sealing element is provided between the filter assembly and the air intake channel, and the first sealing element constitutes the side wall of the filter chamber;

[0019] The first seal has at least two first airflow holes.

[0020] In some embodiments of this utility model, the air path switching assembly further includes a connecting plate, the switching switch and the slider are respectively disposed on both sides of the connecting plate along the direction perpendicular to the air intake channel, the switching switch protrudes in the direction away from the connecting plate and extends out of the housing at the groove.

[0021] In some embodiments of this utility model, a second sealing element is further provided between the housing and the connecting plate. The second sealing element is frame-shaped, and the switching switch passes through the second sealing element.

[0022] In some embodiments of this utility model, the housing further includes a receiving cavity, which is connected to the air passages located on both sides, and the slider is disposed in the receiving cavity;

[0023] The switching switch drives the slider to move, thereby selectively blocking the gas passage located on one side.

[0024] In some embodiments of this utility model, the housing has an inlet end and an outlet end disposed opposite to each other along the extending direction of the air passage, and the accommodating cavity includes a first accommodating cavity and a second accommodating cavity, the first accommodating cavity being located at the inlet end and the second accommodating cavity being located at the outlet end;

[0025] The slider includes a first slider and a second slider; the first slider is housed in the first receiving cavity, and the second slider is housed in the second receiving cavity;

[0026] The switching switch drives the first slider and the second slider to move synchronously and move in opposite directions perpendicular to the air passage, so as to block the air passages located on both sides respectively.

[0027] The air passage on one side is connected to the inlet end, forming an air intake passage for the smoke to be filtered to enter the housing; the air passage on the other side is connected to the outlet end, forming an exhaust passage for the filtered smoke to exit the housing.

[0028] In some embodiments of this utility model, the air path switching assembly further includes a transmission component; the transmission component is respectively coupled with the first slider, the second slider, and the switching switch for transmission.

[0029] The switching switch drives the transmission component to rotate, thereby causing the first slider and the second slider to move in opposite directions respectively.

[0030] In some embodiments of this utility model, the transmission component includes a main transmission wheel, a first driven wheel, and a second driven wheel; the first driven wheel and the second driven wheel are respectively located at both ends of the main transmission wheel along the extension direction of the air passage, and are respectively meshed with the main transmission wheel;

[0031] The first slider has a first engaging portion, and the first driven wheel engages with the first engaging portion to drive the first slider to move;

[0032] The second slider has a second engaging portion, and the second driven wheel engages with the second engaging portion to drive the second slider to move;

[0033] The switching switch has a third engagement part, which engages with the main drive wheel to drive the main drive wheel to rotate.

[0034] In some embodiments of this utility model, the slider moves along the length of the accommodating cavity to block the air passage located on one side, and the length of the slider along the width of the accommodating cavity matches the width of the accommodating cavity.

[0035] In some embodiments of this utility model, the filtering assembly includes a filter screen and a first filtering element;

[0036] The first filter element is disposed between the filter screen and the air passage into which the smoke to be filtered enters, and is used to filter out large particles in the aerosol; the filter screen is used to filter out aerosols and harmful chemicals.

[0037] In some embodiments of this utility model, the filter assembly further includes a second filter element, which is disposed between the first filter element and the filter screen and has a channel for the smoke to be filtered to pass through. The second filter element is used to absorb water vapor in the smoke to be filtered.

[0038] In some embodiments of this utility model, the filter assembly further includes a filter screen seal, which covers the outside of the filter screen and abuts against the housing; or

[0039] An adhesive component is provided on the end face of the filter screen that contacts the housing.

[0040] In some embodiments of this utility model, the filter assembly further includes activated carbon, which is disposed in the gas passage for the filtered smoke to be discharged.

[0041] In some embodiments of this utility model, the filter screen includes a filter material body, a supporting strip, and an edge sealing structure;

[0042] The filter material body is provided with the support strip, which is used to bond the filter material body together when it is folded to form oppositely arranged pleated surfaces;

[0043] The sealing structure exposes the pleated surface and covers the other sides of the filter material body;

[0044] The pleated surfaces, which are arranged opposite to each other, are respectively oriented towards the air passages located on both sides.

[0045] In some embodiments of this utility model, the fiber diameter of the filter screen is 0.1μm to 5μm; the pore size of the filter screen is 0.1μm to 20μm; and the porosity of the filter screen is 20% to 80%.

[0046] Compared with the prior art, the smoke filtering device of this utility model has the following advantages:

[0047] This invention proposes a smoke filtration device, including a housing and an air path switching assembly. The housing contains a filter assembly and air path channels located on both sides of the filter assembly. Smoke to be filtered enters the housing through the air path channel on one side, is filtered by the filter assembly, and then exits the housing through the air path channel on the other side. The air path switching assembly is movable within the housing and can selectively block an air path channel to adjust the airflow path of at least one side of the air path channel. This allows the smoke to be filtered to pass through different filter assemblies or from different directions, reducing aerosol residue on the filter assemblies, thereby improving the filtration efficiency of the smoke, extending the service life of the filter assemblies, and reducing the operating cost of the smoke filtration device. Attached Figure Description

[0048] Figure 1 The image shown is a cross-sectional view of the first smoke filtering device provided in this embodiment of the present invention.

[0049] Figure 2 The diagram shown is an exploded structural diagram of the first smoke filtration device provided in this embodiment of the present invention.

[0050] Figure 3 The image shown is provided by an embodiment of this utility model. Figure 2 A schematic diagram of the first airflow path of the smoke filtering device in the image.

[0051] Figure 4 The image shown is provided by an embodiment of this utility model. Figure 2 A schematic diagram of the second airflow path for the smoke filtering device in the diagram.

[0052] Figure 5 The image shown is provided by an embodiment of this utility model. Figure 2 A schematic diagram of the airflow path of the smoke filtration device.

[0053] Figure 6 The diagram shown is a structural schematic of the second type of smoke filtration device provided in this embodiment of the present invention.

[0054] Figure 7 The diagram shown is an exploded view of the second type of smoke filtration device provided in this embodiment of the present invention.

[0055] Figure 8 The image shown is provided by an embodiment of this utility model. Figure 7 A schematic diagram of the first airflow path of the smoke filtering device in the image.

[0056] Figure 9 The image shown is provided by an embodiment of this utility model. Figure 7 A schematic diagram of the second airflow path for the smoke filtering device in the diagram.

[0057] Figure 10The image shown is a cross-sectional view of the first type of filter assembly provided in this embodiment of the present invention.

[0058] Figure 11 The diagram shown is an exploded view of the first type of filter assembly provided in this embodiment of the present invention.

[0059] Figure 12 The image shown is a cross-sectional view of the second type of filter assembly provided in this embodiment of the present invention.

[0060] Figure 13 The diagram shown is an exploded view of the second type of filter assembly provided in this embodiment of the present invention.

[0061] Figure 14 The diagram shown is a structural schematic of the filter screen provided in an embodiment of this utility model.

[0062] The explanations of the reference numerals in the accompanying drawings are as follows:

[0063] 10-Housing; 10a-Inlet end; 10b-Outlet end; 10c-Top cover; 10d-Bottom shell; 100-Filter assembly; 101-Slide groove; 102-Inlet channel; 103-Outlet channel; 104-Filter chamber; 105-First airflow hole; 106-First seal; 107-Connecting plate; 108-Second seal; 109-First receiving cavity; 110-Second receiving cavity;

[0064] 120 - Filter screen; 121 - First filter element; 122 - Second filter element; 123 - Filter screen seal; 124 - Adhesive component; 125 - Activated carbon;

[0065] 130 - Filter media body; 131 - Support strip; 132 - Edge sealing structure; 133 - Pleated surface;

[0066] 20-Air path switching assembly; 200-Switch; 201-Slider; 202-Second airflow orifice; 203-First slider; 204-Second slider; 205-Main drive wheel; 206-First driven wheel; 207-Second driven wheel; 208-First meshing part; 209-Second meshing part; 210-Third meshing part;

[0067] a - First filter chamber; b - Second filter chamber. Detailed Implementation

[0068] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0069] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do 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 utility model.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0071] In related technologies, HEPA filters are typically used to filter and recycle aerosol particles from secondhand smoke generated by e-cigarettes in order to reduce the impact of aerosol particles on the surrounding environment and human health.

[0072] As those skilled in the art will understand, the aerosol produced by electronic cigarettes is mainly composed of liquid particles, which are captured by HEPA filters primarily through inertial impaction, diffusion deposition, and interception effects. When air enters from a single direction, particles form a gradient deposition on the side of the filter facing the airflow. Larger particles near the airflow inlet deposit first to form a "filter cake layer," while smaller particles in the deeper layers of the filter gradually fill the pores. This uneven deposition will lead to rapid blockage of local pores, especially at the inlet where a dense "bridging structure" is formed, causing the airflow resistance to increase exponentially.

[0073] During use, aerosol particles will continuously accumulate on the surface of a HEPA filter with unidirectional air intake, resulting in excessive resistance and difficulty in continuously and effectively absorbing secondhand smoke, thus causing a shorter lifespan for the HEPA filter.

[0074] Based on this, please refer to Figure 1 and Figure 6This utility model provides a smoke filtering device, including: a housing 10 and an air path switching component 20; the housing 10 is provided with a filter component 100 and air path channels respectively disposed on both sides of the filter component 100, the air path channel on one side allows the smoke to be filtered to enter the housing 10, and the air path channel on the other side allows the filtered smoke to exit the housing 10; the air path switching component 20 is movable inside the housing 10 and can selectively block the air path channel to adjust the airflow path of the air path channel located on at least one side.

[0075] In the process of using the above-mentioned smoke filtration device, the smoke to be filtered enters the housing 10 through the air passage on one side, passes through the filter assembly 100, and is then filtered and cleaned. The smoke is then discharged from the housing 10 through the air passage on the other side. Those skilled in the art will understand that when air enters from a single direction, aerosol particles in the smoke to be filtered will deposit on the surface of the filter assembly 100, causing blockage. Therefore, this embodiment adds an air passage switching component 20 to the smoke filtration device. By moving the air passage switching component 20 inside the housing 10, it selectively blocks the air passage, adjusting the airflow path of at least one side of the air passage. This allows the smoke to be filtered to pass through different filter assemblies 100, or changes the direction of the smoke through the filter assembly 100, thus avoiding blockage of the filter assembly 100 caused by single air entry and improving filtration efficiency. This also eliminates the need for frequent replacement of the filter assembly 100, thereby reducing operating costs.

[0076] It should be noted that in this embodiment, the housing 10 includes an upper cover 10c and a bottom cover 10d, which are detachably connected to each other to facilitate the inspection and replacement of the filter assembly 100 during use, thereby further improving the performance of the smoke filter device.

[0077] As an optional embodiment, please refer to Figure 1 , Figure 2 and Figure 7 The gas path switching assembly 20 includes a switching switch 200 and a slider 201. A groove 101 extending through the housing 10 is provided on the housing 10. The switching switch 200 is slidably connected to the groove 101 and is used to drive the slider 201 to move inside the housing 10. The slider 201 is used to block or unblock the gas path passage. Preferably, the switching switch 200 protrudes from the housing 10. An operator can move the switching switch 200 along the extension direction of the groove 101 to drive the slider 201 to move inside the housing 10, thereby blocking or unblocking the gas path passage.

[0078] Specifically, the switch 200 can be integrated with or directly connected to the slider 201 to control the movement of the slider 201; the switch 200 can also indirectly control the movement of the slider 201 through auxiliary structures (such as transmission systems, gears, screws, etc.); the switch 200 can also be electrically controlled, automatically switching the airflow path based on sensor detection results. In other embodiments, the switch 200 can also control the movement of the slider 201 by rotating around an axis. The configuration of the air path switching component 20 is not limited to the cooperation of the switch 200 and the slider 201; it can also be a pneumatic control method implemented by a pneumatic reversing valve or a pneumatically controlled diaphragm valve, an electric control method implemented by a servo motor or a stepper motor, an electromagnetic control method implemented by an electromagnetic slide valve or an electromagnetic locking mechanism, or an intelligent control method implemented by a flow sensor or a microcontroller.

[0079] The contact surface between the switch 200 and the slide 101 can be frosted to increase the friction between them, thereby ensuring the relative fixation of the slider 201 inside the housing 10. This prevents the switch 200 from sliding freely under gravity, which could cause the slider 201 to fail to block the air passage. Optionally, multiple grooves or protrusions can be provided in the slide 101, with their positions corresponding to the positions where the slider 201 blocks the air passage. During use, the switch 200 moves along the extension direction of the slide 101 to a groove or protrusion, and the slider 201 selectively blocks the air passage. The switch 200 remains in its current position under the action of the groove or protrusion, maintaining the blockage of the air passage by the slider 201.

[0080] To reduce the clogging of the filter element 100 by aerosol particles, the inventors discovered that when the user exhales smoke at short intervals or uses it frequently, a large amount of aerosol particles accumulate on the inlet surface of the filter element 100. These particles do not have enough time to diffuse within the filter element 100, making it prone to clogging and resulting in a shorter lifespan. However, after allowing the filter element 100 to stand for a period of time, the aerosol particles can diffuse within the filter element 100, allowing it to regain some of its lifespan.

[0081] Based on this, please refer to Figures 1 to 5In one optional embodiment, the air passage on one side is an air intake passage 102 for the smoke to be filtered to enter, and the air passage on the other side is an exhaust passage 103 for the filtered smoke to exit; the housing 10 has at least two filter chambers 104 inside, each filter chamber 104 is provided with a filter assembly 100, and each filter chamber 104 is provided with a first airflow hole 105 on the side near the air intake passage 102, the first airflow hole 105 is used to connect the filter chamber 104 and the air intake passage 102; at least two first airflow holes 105 are arranged at intervals along the extension direction of the air intake passage 102; the other side of each filter chamber 104 is connected to the exhaust passage 103; the slider 201 is disposed in the air intake passage 102 and is movable along the extension direction of the air intake passage 102 to selectively block the first airflow hole 105.

[0082] Thus, in this embodiment, the slider 201 selectively blocks the first airflow hole 105, so that after the filter assembly 100 has been used for a period of time, the airflow path of the smoke is changed, and the smoke to be filtered is introduced into different filter chambers 104. This avoids the repeated use of the same filter assembly 100 for a long time, reduces the possibility of the filter assembly 100 becoming clogged, and also ensures that the filter assembly 100 can have a resting time after a period of use, thereby extending the service life of the current filter assembly 100. At the same time, it also reduces the replacement frequency of the filter assembly 100, thereby reducing the cost of use.

[0083] exist Figures 1 to 5 In the illustrated example, the housing 10 has two filter chambers 104 inside. The two filter chambers 104 are arranged at intervals along the extension direction of the air intake channel 102. A partition can be provided between the two filter chambers 104. The partition can be integrally formed with the inner wall of the housing 10, or it can be welded or snap-fitted to completely isolate the two filter chambers 104 and keep them sealed, so as to prevent smoke from flowing between the different filter chambers 104 and affecting the recovery of the stationary filter assembly 100.

[0084] In some embodiments, the housing 10 may also have three or more filter chambers 104. The filter chambers 104 may be arranged at intervals along the extension direction of the air intake channel 102, or at an angle to the extension direction of the air intake channel 102, or randomly. However, it is necessary to ensure that the corresponding multiple first airflow holes 105 are arranged along the extension direction of the air intake channel 102 so that when the slider 201 slides along the extension direction of the air intake channel 102, it can block the first airflow holes 105.

[0085] The first airflow hole 105 can be a round hole, elliptical hole, square hole, triangular hole, etc. with a regular cross-section, or it can be an irregularly shaped hole with an irregular cross-section, as long as the smoke can pass through without resistance.

[0086] Please refer to Figure 1 and Figure 2 The slider 201 is provided with a second airflow hole 202, which extends through the slider 201 along the extension direction of the air intake channel 102. Since the second airflow hole 202 is positioned along the extension direction of the air intake channel 102, when the side wall of the slider 201 blocks the first airflow hole 105, the smoke to be treated can pass through the second airflow hole 202 to continue flowing along the air intake channel 102 and enter the corresponding filter chamber 104 through different first airflow holes 105. This prevents smoke accumulation in the air intake channel 102 due to the blockage of the slider 201, thus ensuring the filtration effect.

[0087] The second airflow hole 202 can be a round hole, elliptical hole, square hole, triangular hole, etc. with a regular cross-section, or it can be an irregularly shaped hole with an irregular cross-section, as long as the smoke can pass through without resistance.

[0088] Please refer to Figures 3 to 5 The switch 200 has an off position and an on position. When the switch 200 is in the off position, the side wall of the slider 201 blocks one of the first airflow holes 105, and the smoke to be filtered passes through the second airflow hole 202 and enters the corresponding filter chamber 104 through the other first airflow holes 105. When the switch 200 is in the on position, all the first airflow holes 105 are at least partially open, and the smoke to be filtered enters the different filter chambers 104 through the different first airflow holes 105.

[0089] Taking a housing 10 with two filter chambers 104 as an example, located in Figures 3 to 5 The upper middle filter chamber 104 is the first filter chamber a, located in Figures 3 to 5 The filter chamber 104 in the lower middle is the second filter chamber b.

[0090] exist Figure 3 In the middle, the side wall of the slider 201 blocks the first airflow hole c of the first filter chamber a, so as to cut off the path of the smoke to be filtered into the first filter chamber a through the first airflow hole c. After the smoke to be filtered enters the housing 10 from the air intake channel 102, it passes through the second airflow hole 202 and continues to flow along the air intake channel 102, so as to enter the second filter chamber b through the first airflow hole d. After being filtered by the filter assembly 100 in the second filter chamber b, it is discharged from the housing 10 through the exhaust channel 103 located on the other side.

[0091] exist Figure 4In the middle, the side wall of the slider 201 blocks the first airflow hole d of the second filter chamber b, so as to cut off the path of the smoke to be filtered into the second filter chamber b through the first airflow hole d. After the smoke to be filtered enters the housing 10 through the air intake channel 102, it enters the first filter chamber a through the first airflow hole c. Even if the smoke volume is large, it passes through the second airflow hole 202 and continues to flow along the air intake channel 102. Eventually, it will return from the second airflow hole 202 due to the change in air pressure and enter the first filter chamber a through the first airflow hole c. After being filtered by the filter component 100 in the first filter chamber a, it is discharged from the housing 10 through the exhaust channel 103 located on the other side.

[0092] exist Figure 5 In this configuration, slider 201 does not block either of the first airflow holes 105, meaning that the filter components 100 located in the two filter chambers 104 work synchronously. The smoke to be filtered can either enter the first filter chamber a through the first airflow hole 105, or pass through the second airflow hole 202 and enter the second filter chamber b through the first airflow hole 105. Figure 5 In the illustrated example, the slider 201 is located between two first airflow holes 105, both of which are fully open. In some other embodiments, the slider 201 may also partially block the first airflow holes 105. The partially open first airflow holes 105 have the same function as the fully open first airflow holes 105, both of which can enable the flow of the smoke to be filtered.

[0093] When the housing 10 has more than two filter chambers 104, the number of sliders 201 can be one or more. Since one slider 201 can only block one first airflow hole 105 at a time, when there is only one slider 201, multiple filter chambers 104 in the housing 10 can work simultaneously; when there are multiple sliders 201, only one filter chamber 104 in the housing 10 can work, or multiple filter chambers 104 can work simultaneously. It should be noted that regardless of whether the slider 201 selectively blocks the first airflow hole 105, at least one filter chamber 104 in the housing 10 must be working.

[0094] Please refer to Figure 2 Optionally, a first sealing element 106 is provided between the filter assembly 100 and the air intake channel 102, and the first sealing element 106 forms the sidewall of the filter chamber 104; the first sealing element 106 has at least two first airflow holes 105. It should be noted that the number of first airflow holes 105 on the first sealing element 106 should match the number of filter chambers 104. The first sealing element 106 can be a silicone sheet, which abuts against the inner wall of the housing 10 and can be fixed to the partition between the filter chambers 104 to ensure the seal between the air intake channel 102 and the filter chamber 104, further reducing the probability of leakage of the smoke to be filtered from the assembly gap.

[0095] In one embodiment, please refer to... Figure 2 The air path switching assembly 20 also includes a connecting plate 107. A switching switch 200 and a slider 201 are respectively disposed on both sides of the connecting plate 107 along a direction perpendicular to the air intake channel 102. The switching switch 200 protrudes away from the connecting plate 107 and extends out of the housing 10 through the groove 101. It should be noted that the switching switch 200 and the slider 201 can be integrally disposed and pass through the connecting plate 107, or they can be separately connected to the connecting plate 107. The length of the connecting plate 107 along the extension direction of the air intake channel 102 is greater than the length of the groove 101. The user directly drives the connecting plate 107 and the slider 201 to move together using the switching switch 200 extending out of the housing 10. During the movement of the slider 201 driven by the switching switch 200, the connecting plate 107 remains positioned between the housing 10 and the air intake channel 102, and its length completely covers the groove 101 on the housing 10, preventing the smoke to be filtered from leaking to the outside of the housing 10 through the groove 101 during the movement of the slider 201, thus avoiding environmental impact.

[0096] Furthermore, a second sealing element 108 is provided between the housing 10 and the connecting plate 107. The second sealing element 108 is frame-shaped, and the switch 200 passes through the second sealing element 108. It should be noted that the second sealing element 108 can be a silicone ring, which is arranged around the edge of the slide groove 101 and always abuts against the connecting plate 107, so as to fill the assembly gap between the connecting plate 107 and the housing 10 during the movement of the slider 201 and the connecting plate 107, thereby further improving the sealing effect. At the same time, the second sealing element 108 is provided with a through hole for the switch 200 to pass through, so that the switch 200 can pass through the second sealing element 108 and protrude from the housing 10 at the slide groove 101.

[0097] To further reduce the clogging of the filter element 100 by aerosol particles, the inventors also discovered that when the filter element 100 uses a single-sided air intake mode, the long-term flow of aerosol particles will cause a thick deposition layer to form on the inlet side of the filter element 100. The deposition thickness on the inlet side is 3 to 5 times that on the other side, which easily causes clogging of the filter element 100. Moreover, single-sided air intake only utilizes the surface pores on one side of the filter element 100, and the actual effective filtration area is only 50% to 70% of the total area of ​​the filter element 100, resulting in a waste of effective filtration area. Liquid particles in aerosol particles will also form an irreversible adhesion layer on the inlet side of the filter element 100, which will also reduce the service life of the filter element 100.

[0098] Conversely, when the filter assembly 100 uses the alternating air intake mode, the reverse airflow creates a reverse scouring and symmetrical deposition effect on the original deposit layer, resulting in aerosol particles being evenly distributed on both sides of the filter assembly 100 and in its internal pores. The difference in deposition thickness between the two sides is less than 10%, preventing the formation of a thick deposit layer on one side. Furthermore, the alternating air intake mode utilizes the surface pores on both sides of the filter assembly 100, effectively increasing the filtration area utilization rate to nearly 100%. The periodic shear stress generated by the alternating air intake mode also weakens the van der Waals forces between the particles and the filter assembly 100, causing some sticky particles to detach with the reverse airflow, reducing clogging and extending the service life of the filter assembly 100. In summary, the alternating air intake mode effectively extends the service life of the filter assembly 100 compared to the single-sided air intake mode.

[0099] Based on this, please refer to Figures 6 to 9 In another optional embodiment, the housing 10 further includes a receiving cavity, which communicates with air passages located on both sides. A slider 201 is disposed in the receiving cavity, and a switch 200 drives the slider 201 to move, thereby selectively blocking the air passage located on one side. It should be noted that... Figures 7 to 9 For example, the two air passages are respectively set along the length of the accommodating cavity (in Figure 8 At both ends (in the X direction), slider 201 is movable along the length of the accommodating cavity, and slider 201 is movable along the width direction of the accommodating cavity (in the X direction). Figure 7 The length of the cavity (in the Z direction) is matched with the width of the accommodating cavity.

[0100] Therefore, when slider 201 moves to a position close to one side of the air passage, it can block the air passage on that side, allowing smoke to flow through the air passage on the other side. When slider 201 moves to a position close to the other side of the air passage, it can block the air passage on that side, allowing smoke to flow through the air passage on the current side. The arrangement of slider 201 changes the airflow path of filter assembly 100 from single-sided air intake to alternating air intake from both sides, reducing the deposition of aerosol particles on filter assembly 100, improving the utilization rate of the filter area, and extending the service life of filter assembly 100.

[0101] Optionally, the two ends of the slider 201 along the extension direction of the air passage need to abut against the housing 10 and the isolation member respectively to ensure that the slider 201 can completely block the air passage on one side. The isolation member can be a separate isolation plate between the slider 201 and the filter assembly 100, extending along the length of the accommodating cavity and leaving a gap with the side wall of the housing 10 along the length of the accommodating cavity to connect the air passages on both sides. Alternatively, the isolation member can be the sealing structure 132 in the filter assembly 100, on which the slider 201 can slide directly. The sliding range of the slider 201 can be equal to or less than the length range of the sealing structure 132 along the length of the accommodating cavity, thereby ensuring that the smoke to be filtered does not leak out from the gap between the slider 201 and the housing 10 or the isolation member during the movement of the slider 201, thus reducing the impact on the surrounding environment.

[0102] For details, please refer to Figure 8 and Figure 9 The housing 10 has an inlet end 10a and an outlet end 10b disposed opposite each other along the extension direction of the air passage. The accommodating cavity includes a first accommodating cavity 109 and a second accommodating cavity 110, with the first accommodating cavity 109 located at the inlet end 10a and the second accommodating cavity 110 located at the outlet end 10b. The slider 201 includes a first slider 203 and a second slider 204; the first slider 203 is accommodated in the first accommodating cavity 109, and the second slider 204 is accommodated in the second accommodating cavity 110. The switching switch 200 drives the first slider 203 and the second slider 204 to move synchronously. The air passages are moved in opposite directions perpendicular to the air passage to block the air passages on both sides respectively. The air passage on one side is connected to the inlet end 10a to form an air intake passage 102 for the smoke to be filtered to enter the housing 10. The air passage on the other side is connected to the outlet end 10b to form an exhaust passage 103 for the filtered smoke to exit the housing 10. This ensures that one of the air passages on both sides is an air intake passage 102 and the other is an exhaust passage 103, forming a complete path for the smoke to be filtered to enter the housing 10 and exit the housing 10.

[0103] It needs to be explained that, in Figure 8 and Figure 9 In the middle, the housing 10 is provided with a first side and a second side in sequence along the length direction of the accommodating cavity.

[0104] exist Figure 8In this configuration, the first slider 203 is positioned closer to the first side, and the second slider 204 is positioned closer to the second side. At this time, the first slider 203 blocks the air passage e near the first side, and the second slider 204 blocks the air passage f near the second side. The air passage f connects to the inlet end 10a to form the air intake passage 102, and the air passage e connects to the outlet end 10b to form the exhaust passage 103. The smoke to be filtered enters the housing 10 through the air passage f and exits the housing 10 through the air passage e after passing through the filter assembly 100.

[0105] exist Figure 9 In this configuration, the first slider 203 is positioned closer to the second side, and the second slider 204 is positioned closer to the first side. At this time, the first slider 203 blocks the air passage f near the second side, and the second slider 204 blocks the air passage e near the first side. The air passage e connects with the inlet end 10a to form the air intake passage 102, and the air passage f connects with the outlet end 10b to form the exhaust passage 103. Filtered smoke enters the housing 10 through the air passage e, and after passing through the filter assembly 100, it exits the housing 10 through the air passage f.

[0106] Preferably, the user can activate the switch 200 after exhaling 3 to 10 puffs of smoke to change the position of the slider 201 and switch the airflow path of the smoke. Tests show that the lifespan of the filter assembly 100 is increased most significantly when the airflow path is switched at this frequency.

[0107] Please refer to Figures 6 to 7 The gas path switching assembly 20 also includes a transmission component; the transmission component cooperates with the first slider 203, the second slider 204, and the switching switch 200 for transmission; the switching switch 200 drives the transmission component to rotate, thereby causing the first slider 203 and the second slider 204 to move in opposite directions respectively. The transmission component makes the driving method between the switching switch 200 and the slider 201 more flexible, no longer limited to direct drive, and can select different driving methods in different application scenarios, further expanding the application range of the gas path switching assembly 20.

[0108] In this embodiment, the switch 200 uses a transmission component to drive the first slider 203 and the second slider 204 to move. The transmission component can be a physical transmission member such as a gear, screw, or transmission valve; it can also be an intelligent transmission member such as a sensor or microcontroller; or it can be a hybrid transmission member formed by the combination of a sensor and gears. The transmission component can be directly connected to the switch 200, the first slider 203, and the second slider 204, or it can form a force transmission system with other connecting components to achieve transmission. Those skilled in the art can configure it according to the actual situation.

[0109] In some embodiments, the transmission component includes a main drive wheel 205, a first driven drive wheel 206, and a second driven drive wheel 207; the first driven drive wheel 206 and the second driven drive wheel 207 are respectively located at both ends of the main drive wheel 205 along the air passage extension direction, and are respectively engaged with the main drive wheel 205; the first slider 203 has a first engagement portion 208, and the first driven drive wheel 206 cooperates with the first engagement portion 208 to drive the first slider 203 to move; the second slider 204 has a second engagement portion 209, and the second driven drive wheel 207 cooperates with the second engagement portion 209 to drive the second slider 204 to move; the switch 200 has a third engagement portion 210, and the third engagement portion 210 cooperates with the main drive wheel 205 to drive the main drive wheel 205 to rotate. Thus, through the transmission between the gear and the meshing part, the force is evenly distributed and has good centering and guiding properties. The first slider 203 and the second slider 204 can be automatically positioned and move in a specific direction with the cooperation of the gear and the meshing part, which has good connection accuracy and reliability.

[0110] In this embodiment, the first slider 203 engages with the first driven wheel 206 via a first engaging portion 208, at least partially engaging with the first driven wheel 206, to drive the first slider 203 to move forward or backward in a direction perpendicular to the air passage. Similarly, the second slider 204 engages with the second driven wheel 207 via a second engaging portion 209, at least partially engaging with the second driven wheel 207. In contrast, the switching switch 200 can engage with the main drive wheel 205 only at a specific position via a third engaging portion 210 to provide force to the main drive wheel 205, causing it to rotate around its axis and drive the first driven wheel 206 and the second driven wheel 207, thereby driving the first slider 203 and the second slider 204.

[0111] exist Figure 6 and Figure 7 In the example, the transmission component includes three transmission gears to respectively engage with the switch 200 and the two sliders 201, ensuring the connection stability between the gears and the meshing parts. In other embodiments, the transmission component may also include only one transmission gear to simultaneously engage with the switch 200 and the two sliders 201; the transmission component may also include more transmission gears to improve connection strength and stability.

[0112] Please refer to Figures 10 to 14 In an alternative embodiment, the filter assembly 100 includes a filter screen 120 and a first filter element 121; the first filter element 121 is disposed between the filter screen 120 and the air passage into which the smoke to be filtered enters, for filtering out large particles in the aerosol; the filter screen 120 is used to filter out aerosols and harmful chemicals.

[0113] It should be noted that in this embodiment, the first filter element 121 can be a mesh cotton, activated carbon 125, a woven steel mesh, or a perforated steel mesh. The first filter element 121 is used to filter large particles in the aerosol in advance to prevent large particles from clogging the filter screen 120 and reducing its service life.

[0114] The filter 120 can be a HEPA filter 120, and the material of the filter 120 can be glass fiber, polypropylene (PP) fiber, or synthetic fiber, preferably glass fiber. Those skilled in the art will understand that glass fiber has good high-temperature resistance, chemical corrosion resistance, and dimensional stability. A filter 120 made of glass fiber has high filtration efficiency. In this embodiment, the fiber diameter of the filter 120 is preferably 0.1 μm to 5 μm, the pore size of the filter 120 is preferably 0.1 μm to 20 μm, and the porosity of the filter 120 is preferably 20% to 80%. This ensures that the filter 120 has good strength while maintaining high filtration efficiency, thereby further extending the service life of the filter 120.

[0115] For details, please refer to Figure 14 The filter screen 120 includes a filter media body 130, a support strip 131, and a sealing structure 132. The filter media body 130 is provided with a support strip 131, which is used to bond the filter media body 130 together when it is folded to form oppositely arranged pleated surfaces 133. The sealing structure 132 is exposed above the pleated surfaces 133 and covers the other sides of the filter media body 130. The oppositely arranged pleated surfaces 133 are respectively oriented towards the air passages located on both sides.

[0116] Thus, the pleated surfaces 133, positioned opposite each other, face the air passages on both sides, increasing the airflow area and reducing the resistance to airflow. Simultaneously, by increasing the number of folds in the filter media body 130, the contact area between the filter media body 130 and the airflow is increased, thereby increasing the absorption capacity of the filter media body 130 and ultimately extending the service life of the filter screen 120. Furthermore, the supporting strips 131 adhere to each other during the folding of the filter media body 130, providing shaping and support, preventing the filter media body 130 from collapsing due to excessive wind pressure, and evenly dispersing the airflow, reducing the shortened lifespan caused by localized overload.

[0117] In some embodiments, the manufacturing process of the filter screen 120 is as follows: support strips 131 are applied to the front and back sides of the flat filter material body 130 according to the design dimensions, and the filter material body 130 is folded according to the preset dimensions. The support strips 131 bond the folded filter material bodies 130 together to form a stable pleated surface 133. Then, the edge sealing structure 132 is used to seal the other sides except for the oppositely arranged pleated surfaces 133.

[0118] The sealing structure 132 can be a plastic frame made of EVA (ethylene-vinyl acetate copolymer), PP (polypropylene), PET (polyethylene terephthalate), etc., or a metal frame or a wooden frame. The seal between the sealing structure 132 and the filter material body 130 can be formed using hot melt adhesive, epoxy resin adhesive, silicone adhesive, ultrasonic welding, metal clamping, etc., to ensure that smoke does not leak from the gap between the filter material body 130 and the sealing structure 132 during the process of passing through the filter screen 120.

[0119] Preferably, the filter 120 can be treated with an electrostatic electret process, that is, electrostatic charges are implanted in glass fiber or polypropylene fiber, and nano-sized particles are captured by electrostatic adsorption, which can improve the filtration efficiency of the filter 120 by 20% to 30% and increase the resistance by less than 10%.

[0120] Please refer to Figures 10 to 13 The filter assembly 100 further includes a second filter element 122, which is disposed between the first filter element 121 and the filter screen 120, and has a channel for the smoke to be filtered to pass through. The second filter element 122 is used to absorb moisture in the smoke to be filtered. It should be noted that the second filter element 122 can be absorbent cotton, which has a channel for the smoke to be filtered to pass through, so as not to affect the passage of the smoke to be filtered. In some other embodiments, the second filter element 122 can also be other components with water absorption function, which is not limited in this embodiment.

[0121] Optional, please continue to refer to Figures 10 to 13 The filter assembly 100 also includes a filter screen seal 123, which covers the outside of the filter screen 120 and abuts against the housing 10; alternatively, an adhesive member 124 is provided on the end face of the filter screen 120 that contacts the housing 10. To ensure a seal between the filter assembly 100 and the housing 10, in Figures 10 to 11 In this process, the sealing method is as follows: glue is applied to the end face of the filter screen 120 that contacts the housing 10 to form a seal; Figures 12 to 13 In this case, the sealing method is as follows: a filter screen sealing element 123 is fitted on the outside of the filter screen 120, and a seal is formed by the contact between the filter screen sealing element 123 and the housing 10.

[0122] Please refer to Figure 1 To further filter out odors from the filtered smoke, the filter assembly 100 also includes activated carbon 125, which is disposed in the air passage for the filtered smoke to be discharged.

[0123] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A smoke filtering device, characterized in that, include: The housing has a filter assembly inside and air passages respectively disposed on both sides of the filter assembly; The air passage located on one side allows the smoke to be filtered to enter the housing, while the air passage located on the other side allows the filtered smoke to exit the housing. as well as An air path switching assembly is movable inside the housing and can selectively block the air path passage to adjust the airflow path of the air path passage located on at least one side.

2. The smoke filtering device according to claim 1, characterized in that, The gas path switching assembly includes a switching switch and a slider; a groove penetrating the housing is provided on the housing; The switching switch is slidably connected to the slide groove and is used to drive the slider to move inside the housing; the slider is used to block or unblock the air passage.

3. The smoke filtering device according to claim 2, characterized in that, The air passage located on one side is an air intake passage for the smoke to be filtered to enter, and the air passage located on the other side is an exhaust passage for the filtered smoke to be discharged. The housing has at least two filter chambers inside, each of which is equipped with the filter assembly. Each filter chamber has a first airflow hole on the side near the air intake channel, and the first airflow hole is used to connect the filter chamber and the air intake channel. At least two of the first airflow holes are arranged at intervals along the extension direction of the air intake channel; the other side of each of the filter chambers is connected to the exhaust channel; The slider is disposed within the air intake channel and is movable along the extension direction of the air intake channel to selectively block the first airflow hole.

4. The smoke filtering device according to claim 3, characterized in that, The slider is provided with a second airflow hole, which extends through the slider along the extension direction of the air intake channel.

5. The smoke filtering device according to claim 4, characterized in that, The switch has an off position and an on position; When the switching switch is in the off position, the side wall of the slider blocks one of the first airflow holes, and the smoke to be filtered passes through the second airflow hole and enters the corresponding filter chamber through the other first airflow holes; When the switch is in the open position, all the first airflow holes are at least partially open, and the smoke to be filtered enters the different filter chambers through the different first airflow holes.

6. The smoke filtering device according to claim 3, characterized in that, A first sealing element is provided between the filter assembly and the air intake channel, and the first sealing element constitutes the side wall of the filter chamber. The first seal has at least two first airflow holes.

7. The smoke filtering device according to claim 3, characterized in that, The air path switching assembly also includes a connecting plate. The switching switch and the slider are respectively disposed on both sides of the connecting plate in a direction perpendicular to the air intake channel. The switching switch protrudes in a direction away from the connecting plate and extends out of the housing at the groove.

8. The smoke filtering device according to claim 7, characterized in that, A second sealing element is also provided between the housing and the connecting plate. The second sealing element is frame-shaped, and the switching switch passes through the second sealing element.

9. The smoke filtering device according to claim 2, characterized in that, The housing also includes a receiving cavity, which is connected to the air passages located on both sides, and the slider is disposed in the receiving cavity; The switching switch drives the slider to move, thereby selectively blocking the gas passage located on one side.

10. The smoke filtering device according to claim 9, characterized in that, The housing has an inlet end and an outlet end that are disposed opposite to each other along the extension direction of the gas passage. The accommodating cavity includes a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is located at the inlet end and the second accommodating cavity is located at the outlet end. The slider includes a first slider and a second slider; the first slider is housed in the first receiving cavity, and the second slider is housed in the second receiving cavity; The switching switch drives the first slider and the second slider to move synchronously and move in opposite directions perpendicular to the air passage, so as to block the air passages located on both sides respectively. The air passage on one side is connected to the inlet end, forming an air intake passage for the smoke to be filtered to enter the housing; the air passage on the other side is connected to the outlet end, forming an exhaust passage for the filtered smoke to exit the housing.

11. The smoke filtering device according to claim 10, characterized in that, The air path switching assembly also includes a transmission component; the transmission component is respectively engaged with the first slider, the second slider and the switching switch for transmission. The switching switch drives the transmission component to rotate, thereby causing the first slider and the second slider to move in opposite directions respectively.

12. The smoke filtering device according to claim 11, characterized in that, The transmission component includes a main drive wheel, a first driven wheel, and a second driven wheel; the first driven wheel and the second driven wheel are located at opposite ends of the main drive wheel along the air passage extension direction, and are respectively meshed with the main drive wheel; The first slider has a first engaging portion, and the first driven wheel engages with the first engaging portion to drive the first slider to move; The second slider has a second engaging portion, and the second driven wheel engages with the second engaging portion to drive the second slider to move; The switching switch has a third engagement part, which engages with the main drive wheel to drive the main drive wheel to rotate.

13. The smoke filtering device according to claim 9, characterized in that, The slider moves along the length of the accommodating cavity to block the air passage located on one side, and the length of the slider along the width of the accommodating cavity matches the width of the accommodating cavity.

14. The smoke filtering device according to any one of claims 1 to 13, characterized in that, The filtration assembly includes a filter screen and a first filtration element; The first filter element is disposed between the filter screen and the air passage into which the smoke to be filtered enters, and is used to filter out large particles in the aerosol; The filter is used to remove aerosols and harmful chemicals.

15. The smoke filtering device according to claim 14, characterized in that, The filter assembly further includes a second filter element, which is disposed between the first filter element and the filter screen and has a channel for the smoke to be filtered to pass through. The second filter element is used to absorb water vapor in the smoke to be filtered.

16. The smoke filtering device according to claim 14, characterized in that, The filter assembly further includes a filter screen seal, which covers the outside of the filter screen and abuts against the housing; or An adhesive component is provided on the end face of the filter screen that contacts the housing.

17. The smoke filtering device according to claim 14, characterized in that, The filter assembly also includes activated carbon, which is disposed in the gas passage for the filtered smoke to be discharged.

18. The smoke filtering device according to claim 14, characterized in that, The filter screen includes a filter media body, a supporting strip, and an edge sealing structure; The filter material body is provided with the support strip, which is used to bond the filter material body together when it is folded to form oppositely arranged pleated surfaces; The sealing structure exposes the pleated surface and covers the other sides of the filter material body; The pleated surfaces, which are arranged opposite to each other, are respectively oriented towards the air passages located on both sides.

19. The smoke filtering device according to claim 18, characterized in that, The filter screen has a fiber diameter of 0.1 μm to 5 μm; a pore size of 0.1 μm to 20 μm; and a porosity of 20% to 80%.

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