A filter device

Abstract

The application discloses a filter device, comprising: a suction nozzle; a filter housing connected with the suction nozzle and provided with a containing part for accessing a cigarette inside; the filter housing comprises a first hollow cavity in communication with the containing part, the diameter of the first hollow cavity decreases from the end to the middle part, and the middle part of the first hollow cavity is provided with a plurality of shunt channels; a second hollow cavity is arranged inside the end of the first hollow cavity close to the suction nozzle; a filter structure is arranged in the first hollow cavity and the second hollow cavity, and the smoke of the cigarette can be filtered in sequence through the first hollow cavity and the second hollow cavity and then sent to the suction nozzle. The filter device can prolong the filtering time of the smoke, improve the filtering effect of the smoke and reduce the harm to the human body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cigarette processing equipment, in particular to a filtering device. BACKGROUND

[0002] A cigarette filter is a component for filtering harmful substances such as tar, carbon monoxide, smoke nicotine, etc. in a cigarette, thereby reducing the harm of smoking to the human body.

[0003] In the related art, the filter is usually made of wood fiber, and the internal filtering air duct is the same as the length direction of the cigarette and is linear. When the harmful substances such as tar, carbon monoxide, smoke nicotine, etc. pass through the linear air duct, the flow resistance is small and the flow speed is fast, so that the harmful substances cannot be fully filtered and are inhaled into the human body through the mouthpiece end, and the filtering effect on the harmful substances is poor.

[0004] To sum up, how to improve the filtering effect of the cigarette filter is a problem to be solved by the technical personnel in the field at present. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a filtering device which can prolong the filtering time of smoke, improve the filtering effect of smoke, and reduce the harm to the human body.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme:

[0007] A filtering device comprises:

[0008] a mouthpiece;

[0009] a filter housing connected with the mouthpiece and having an accommodation portion inside for accommodating a cigarette;

[0010] The filter housing comprises a first hollow cavity in communication with the accommodation portion, the diameter of the end portion to the middle portion of the first hollow cavity decreases, and the middle portion of the first hollow cavity is provided with a plurality of shunt channels;

[0011] a second hollow cavity arranged inside the first hollow cavity at one end close to the mouthpiece;

[0012] a filtering structure arranged in the first hollow cavity and the second hollow cavity, and the smoke of the cigarette can be filtered in sequence through the first hollow cavity and the second hollow cavity and then sent to the mouthpiece.

[0013] Preferably, the first hollow cavity comprises a first cavity and a second cavity in communication with each other, the first cavity is in communication with the accommodation portion, and the second cavity is arranged close to the mouthpiece and has the filtering mechanism arranged inside.

[0014] Preferably, the first cavity and the second cavity are communicated through a connecting portion, diameters of the first cavity and the second cavity are reduced in a direction close to the connecting portion, and the plurality of shunt channels are distributed on a circumferential direction of the connecting portion.

[0015] Preferably, the filter structure comprises a filter arranged in the second hollow cavity, and the filter comprises:

[0016] A filter pipe is arranged in the second hollow cavity and is provided with a plurality of flue gas inlets;

[0017] A filter screen is arranged outside the filter pipe;

[0018] A cleaning plate is movably arranged outside the filter screen and is used for cleaning the filter screen;

[0019] A connecting pipe is communicated with the filter pipe and the suction nozzle at two ends thereof, the flue gas enters the filter pipe through the filter screen and the flue gas inlets after being filtered, and is then delivered to the suction nozzle through the connecting pipe.

[0020] Preferably, a plurality of sliding portions are arranged on the filter pipe, a push plate is slidingly connected with the sliding portions, one end of the push plate is connected with the cleaning plate, and the other end of the push plate is connected with the sliding portions through a first spring, and the flue gas entering the second hollow cavity can push the push plate to move to press the first spring in a direction close to the suction nozzle.

[0021] Preferably, a connecting member is arranged between the suction nozzle and the filter shell, the connecting member comprises a connecting shell, and the suction nozzle and the filter shell are detachably connected with the connecting shell.

[0022] Preferably, a suction plate is slidingly connected with a side of the connecting shell close to the filter shell, the suction plate is connected with the connecting shell through a second spring, and the first spring presses the second spring in an initial state to press the suction plate.

[0023] Preferably, a socket is arranged on the filter shell, the cleaning plate abuts against the suction plate through the socket, and the second spring is reset to drive the suction plate to be inserted into the socket after the cleaning plate moves out of the socket.

[0024] Preferably, the filter structure further comprises a filter member arranged in the second cavity, and the second cavity is provided with a through hole communicated with the second hollow cavity.

[0025] Preferably, a flue cavity is communicated with one side of the containing portion, and the flue cavity is communicated with the first hollow cavity through a plurality of flue channels.

[0026] The filter device provided by the application comprises a suction nozzle, a filter shell and a filter structure, the inside of the filter shell is provided with a containing part for accommodating a cigarette and is connected with the suction nozzle, and a user smokes filtered smoke through the suction nozzle; the filter shell comprises a first hollow cavity in communication with the containing part, the diameter of the first hollow cavity decreases from the end part to the middle part, and the middle part of the first hollow cavity is provided with a plurality of shunt channels, and a second hollow cavity is arranged inside the end part of the first hollow cavity close to the suction nozzle; when the cigarette is inserted into the containing part, the cigarette is ignited, the smoke can first be accumulated at the end part of the first hollow cavity close to the containing part, then the flow speed of the smoke is reduced through the smaller middle part, and then the smoke is shunted through the plurality of shunt channels in the middle part of the first hollow cavity, so that the flow speed of the smoke in the filter shell is reduced, and then the shunted smoke is sent into the second hollow cavity through the end part of the first hollow cavity close to the suction nozzle, so that the smoke has sufficient filtering time through the first hollow cavity and the second hollow cavity, the filtering effect of harmful substances in the smoke is ensured, and the harm of the smoke to the human body is reduced as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0028] Figure 1 The structural schematic diagram of the filter device provided by the present application is shown in the figure.

[0029] Figure 2 The sectional view of the filter device provided by the present application is shown in the figure. Figure 1 The sectional view of the filter device provided by the present application is shown in the figure.

[0030] Figure 3 The sectional view of the filter device provided by the present application is shown in the figure. Figure 2 The sectional view of the filter device provided by the present application is shown in the figure.

[0031] Figure 4 The structural schematic diagram of the connecting channel provided by the present application is shown in the figure.

[0032] Figure 5 The structural schematic diagram of the filter provided by the present application is shown in the figure.

[0033] Figures 1-5 In the drawings, the reference signs include:

[0034] 10-filtering housing, 11-holding part, 12-smoke cavity, 13-flue, 14-first hollow cavity, 141-first cavity, 142-shunt passage, 143-second cavity, 1431-through hole, 15-second hollow cavity, 16-filter, 161-filter tube, 1611-first spring, 162-filter screen, 163-push plate, 164-cleaning plate, 165-connecting tube, 166-smoke inlet, 20-connector, 21-connection housing, 22-adsorption plate, 23-second spring, 30-mouthpiece. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] The core of the present application is to provide a filtering device, which can prolong the filtering time of smoke, improve the filtering effect of smoke, and reduce the harm to the human body.

[0037] The filtering device provided by the present application comprises a mouthpiece 30, a filtering housing 10, and a filtering structure. Please refer to Figure 1 , Figure 2 , Figure 3 .

[0038] The filtering housing 10 is provided with a holding part 11 for inserting a cigarette. The specific structure of the holding part 11 is not limited, which can be a groove, a socket, a clamping structure, etc., and can realize stable insertion of the cigarette.

[0039] The filtering housing 10 is in communication with the mouthpiece 30. The smoke formed by the burning of the cigarette is filtered through the filtering housing 10, and then the harmful substances are discharged before being inhaled by the user through the mouthpiece 30, so as to reduce the harm to the human body. The mouthpiece 30 and the filtering housing 10 are preferably detachably connected, so as to facilitate assembly and disassembly, and reduce the use cost.

[0040] The filtering housing 10 comprises a first hollow cavity 14 in communication with the holding part 11. The diameter of the first hollow cavity 14 decreases from the end to the middle, that is, the size of the two ends of the first hollow cavity 14 is larger than that of the middle. The middle of the first hollow cavity 14 is provided with a plurality of shunt passages 142. When the smoke enters the first hollow cavity 14, the smoke is first gathered and then slowed down through the middle, and then transported to the second hollow cavity 15 through the end of the first hollow cavity 14 close to the mouthpiece 30. Through the arrangement of the filtering housing 10 with the structure that the two ends are larger and the middle is smaller, the filtering time of the smoke can be prolonged, the filtering effect of the harmful substances such as tar, smoke nicotine and carbon monoxide in the smoke can be improved, and the harm of the smoke to the human body can be reduced.

[0041] In the embodiment, the size and structure of the shunt channel 142 are not limited and can be designed flexibly according to actual design requirements.

[0042] The first hollow cavity 14 and the second hollow cavity 15 are both provided with filtering structures. The smoke of the cigarette is sequentially filtered and purified by the filtering structures in the accommodating portion 11, the first hollow cavity 14, and the second hollow cavity 15, and then is sent to the mouthpiece 30 for the user to smoke, thereby reducing the harm of the smoke to the human body.

[0043] In the embodiment, the filtering structure can be made of a rigid material, which is safer than wood fiber, reusable, and low in processing cost.

[0044] The filtering device includes the mouthpiece 30, the filtering shell 10, and the filtering structure. The filtering shell 10 is internally provided with the accommodating portion 11 for accommodating the cigarette and is connected to the mouthpiece 30. The user smokes the filtered smoke through the mouthpiece 30. The filtering shell 10 includes the first hollow cavity 14 that is in communication with the accommodating portion 11. The diameter of the first hollow cavity 14 decreases from the end portion to the middle portion, and the middle portion of the first hollow cavity 14 is provided with a plurality of shunt channels 142. The second hollow cavity 15 is arranged in the inside of the end of the first hollow cavity 14 close to the mouthpiece 30. When the cigarette is inserted into the accommodating portion 11, the cigarette is ignited. The smoke can first be accumulated at the end of the first hollow cavity 14 close to the accommodating portion 11, then is lowered in flow speed by passing through the middle portion of smaller size, is further shunted by the plurality of shunt channels 142 in the middle portion of the first hollow cavity 14, so that the flow speed of the smoke is slowed down in the filtering shell 10, and then the shunted smoke is sent into the second hollow cavity 15 through the end of the first hollow cavity 14 close to the mouthpiece 30. By slowing down the flow speed of the smoke, the smoke has sufficient filtering time when passing through the first hollow cavity 14 and the second hollow cavity 15, thereby ensuring the filtering effect of the harmful substances in the smoke and reducing the harm of the smoke to the human body as much as possible.

[0045] On the basis of the above embodiment, the first hollow cavity 14 includes the first cavity 141 and the second cavity 143 that are in communication with each other. The first cavity 141 is in communication with the accommodating portion 11. The second cavity 143 is arranged close to the mouthpiece 30 and is internally provided with the filtering structure.

[0046] Please refer to Figure 2 , the first hollow cavity 14 includes the first cavity 141 and the second cavity 143 that are in communication with each other. The first cavity 141 is in communication with the accommodating portion 11. The smoke is accumulated in the first cavity 141 and is shunted after flowing into the second cavity 143. After being filtered by the filtering structure in the second cavity 143, the smoke is further filtered in the second hollow cavity 15. The smoke that is sufficiently filtered and purified is sent to the mouthpiece 30 through the outlet end of the second hollow cavity 15 for the user to smoke.

[0047] The first hollow cavity 14 is divided into two independent cavities, the first cavity 141 collects the flue gas and then divides the flow, slows down the flow of flue gas, and then sends the flue gas into the second cavity 143 for filtering, prolongs the filtering time, and further ensures the filtering effect through two filtering structures.

[0048] On the basis of any of the above embodiments, the first cavity 141 and the second cavity 143 are communicated through a connecting portion, the diameters of the first cavity 141 and the second cavity 143 decrease in the direction close to the connecting portion, and a plurality of shunt channels 142 are distributed on the circumference of the connecting portion.

[0049] Please refer to Figure 2 , Figure 4 The connecting portion is the position of communication between the first cavity 141 and the second cavity 143, and a plurality of shunt channels 142 are distributed on the circumference of the connecting portion, which realizes the shunting of flue gas in the first cavity 141, reduces the flow of flue gas passing through each shunt channel, and further fully contacts with the filtering structure in the second cavity 143, prolongs the filtering time, improves the filtering effect of harmful substances in flue gas, and reduces the harm of flue gas to human body.

[0050] The diameters of the first cavity 141 and the second cavity 143 decrease in the direction close to the connecting portion, so that the whole filtering shell 10 has a funnel shape with large ends and small middle, so as to reduce the flow rate of flue gas in the inside, effectively prolong the filtering time, and improve the filtering effect of flue gas.

[0051] On the basis of any of the above embodiments, the filtering structure includes a filter 16 arranged in the second hollow cavity 15, and the filter 16 includes:

[0052] A filter pipe 161 arranged in the second hollow cavity 15 and provided with a plurality of flue gas inlets 166;

[0053] A filter screen 162 arranged outside the filter pipe 161;

[0054] A cleaning plate 164 movably arranged outside the filter screen 162 and used for cleaning the filter screen 162;

[0055] A connecting pipe 165, both ends of the connecting pipe 165 correspond to the filter pipe 161 and the suction nozzle 30, flue gas filtered by the filter screen 162 enters the filter pipe 161 through the flue gas inlets 166, and is delivered to the suction nozzle 30 through the connecting pipe 165.

[0056] Please refer to Figures 2 to 5 The filtering structure includes a filter 16 arranged in the second hollow cavity 15, and the filter 16 includes a filter pipe 161, a filter screen 162, a cleaning plate 164, and a connecting pipe 165.

[0057] The filtering pipe 161 is fixedly installed in the second hollow cavity 15, and a plurality of smoke inlets 166 are formed in the filtering pipe 161, and the size of the smoke inlets 166 is matched with the size of the filter screen 162 arranged outside the filtering pipe 161.

[0058] The outer side of the filter screen 162 is movably provided with a cleaning plate 164, and the cleaning plate 164 is reciprocally moved to clean the surface of the filter screen 162, so as to ensure the cleanliness of the filter screen 162 and ensure the filtering effect. The cleaning plate 164 is a structure matched with the filter screen 162, and the specific structure form is not limited.

[0059] The moving mode of the cleaning plate 164 is not limited, and the cleaning plate 164 can be pushed by manual or a moving component.

[0060] The two ends of the connecting pipe 165 are communicated with the filtering pipe 161 and the suction nozzle 30, respectively, smoke filtered by the filter screen 162 enters the filtering pipe 161 through the smoke inlets 166, and is transported to the suction nozzle 30 through the connecting pipe 165.

[0061] It should be noted that when the smoke is filtered by the filter screen 162, the cleaning plate 164 is away from the surface of the filter screen 162, so as to avoid blocking the smoke inlets 166 and ensure the normal operation of the filtering operation.

[0062] Further, the lower surface of the cleaning plate 164 is provided with a cleaning structure, and the cleaning structure is a rough surface with unevenness. When the rough surface is in contact with the filter screen 162, the harmful substances remaining on the surface of the filter screen 162 can be effectively removed, so as to realize the timely and effective cleaning of the filter screen 162.

[0063] On the basis of any of the above embodiments, a plurality of sliding parts are arranged on the filtering pipe 161, the sliding parts are slidably connected with a push plate 163, one end of the push plate 163 is connected with the cleaning plate 164, and the other end of the push plate 163 is connected with the sliding parts through a first spring 1611. When the smoke enters the second hollow cavity 15, the push plate 163 can be pushed to move to press the first spring 1611 towards the suction nozzle 30.

[0064] Please refer to Figure 2 、 Figure 5 A plurality of sliding parts are arranged on the filtering pipe 161, and the sliding parts are connected with the push plate 163. Through the arrangement of the sliding parts, the sliding of the push plate 163 relative to the filtering pipe 161 is realized. The sliding parts can be in the form of a combination of a sliding block, a sliding groove, a pulley, a slide, etc., and can be designed according to actual needs.

[0065] Preferably, the structure form of the push plate 163 is the same as the shape of the second hollow cavity 15, and the push plate 163 is matched with the inner wall of the second hollow cavity 15, so as to ensure the accuracy and effectiveness of the operation of the push plate 163.

[0066] One end of the push plate 163 is connected with the cleaning plate 164, and the other end of the push plate 163 is connected with the sliding part through the first spring 1611. The movement of the push plate 163 drives the reciprocating movement of the cleaning plate 164, so as to clean the surface of the filter screen 162, keep the long-term cleanliness of the filter screen 162, and ensure the filtering effect of the flue gas.

[0067] The first spring 1611 can realize the automatic reset of the cleaning plate 164. Specifically, in the initial state, the first spring 1611 is in the original state, and the cleaning plate 164 and the filter screen 162 are attached to block the flue gas inlet 166. When the flue gas enters the inside of the second hollow cavity 15, the push plate 163 and the left side of the second hollow cavity 15 increase the air pressure, so as to drive the push plate 163 to move away from the mouthpiece 30 (i.e. to the right side in the figure). Figure 3 When the flue gas enters the inside of the second hollow cavity 15, the push plate 163 and the left side of the second hollow cavity 15 increase the air pressure, so as to drive the push plate 163 to move away from the mouthpiece 30 (i.e. to the right side in the figure). The first spring 1611 is transformed from the initial state to the compressed state, and the filter screen 162 and the flue gas inlet 166 are exposed. After the flue gas is filtered by the filter screen 162, the flue gas enters the inside of the filter pipe 161 through the flue gas inlet 166. The harmful substances in the flue gas, such as tar, are deposited on the surface of the filter screen 162. After the flue gas is filtered, the first spring 1611 returns to the original state. The push plate 163 and the cleaning plate 164 are reset by the elastic force of the spring. The cleaning plate 164 can wipe the surface of the filter screen 162 during the movement, so as to keep the cleanliness of the filter screen 162 and ensure the long-term high-efficiency operation.

[0068] In this embodiment, as a preferred embodiment, a sliding groove is formed on the filter pipe 161. A sliding part is slidably connected inside the sliding groove. The sliding part is connected with the sliding groove through the first spring 1611, and the sliding part is fixedly connected with the push plate 163. When the first spring 1611 is compressed under the pressure in the second hollow cavity 15, the sliding part can slide relative to the sliding groove to drive the movement of the push plate 163.

[0069] On the basis of any of the above embodiments, the connecting piece 20 is arranged between the mouthpiece 30 and the filter shell 10. The connecting piece 20 includes a connecting shell 21. The mouthpiece 30 and the filter shell 10 are detachably connected with the connecting shell 21.

[0070] Please refer to Figure 2 , Figure 3 The connecting piece 20 includes a connecting shell 21. The mouthpiece 30 and the filter shell 10 are detachably connected with the connecting shell 21, and preferably are threadedly connected. Specifically, a first threaded structure is arranged at the edge of the connecting shell 21. The connection part of the mouthpiece 30 and the filter shell 10 with the connecting shell 21 is provided with a second threaded structure matched with the first threaded structure.

[0071] Through the detachable connection, the replacement and maintenance of the filter screen 162 and the internal parts of the filter shell 10 can be realized, and the operation cost is reduced.

[0072] On the basis of any of the above embodiments, the connecting shell 21 is slidingly connected with the adsorption plate 22 near one side of the filtering shell 10, the adsorption plate 22 is connected with the connecting shell 21 through the second spring 23, and the first spring 1611 extrudes the second spring 23 in the initial state to extrude the adsorption plate 22.

[0073] Please refer to Figure 2 , Figure 3 , the adsorption plate 22 is connected with the connecting shell 21 through the second spring 23 arranged in the connecting shell 21, the elastic force of the first spring 1611 is greater than that of the second spring 23, in the initial state, the first spring 1611 is in the original state, the cleaning plate 164 can be driven to extrude the adsorption plate 22, so that the second spring 23 is in the compressed state, when the cleaning plate 164 moves away from the adsorption plate 22, the second spring 23 drives the adsorption plate 22 to gradually reset, so as to adsorb the harmful substances remaining on the rough surface of the filter screen 162, ensure the cleanliness of the surface of the cleaning plate 164 and the filter screen 162, and improve the service life. After being used for a period of time, the connecting piece 20 can be disassembled to replace or clean and maintain the adsorption plate 22, which is simple and convenient.

[0074] On the basis of any of the above embodiments, the filtering shell 10 is provided with a socket, the cleaning plate 164 abuts against the adsorption plate 22 through the socket, and after the cleaning plate 164 moves out of the socket, the second spring 23 resets to drive the adsorption plate 22 to insert into the socket.

[0075] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 , the cleaning plate 164 and the adsorption plate 22 are both provided with parts matched with the socket, and the cleaning plate 164 and the adsorption plate 22 can alternately block the socket to maintain the air tightness of the second hollow cavity 15.

[0076] Specifically, when the cleaning plate 164 moves out of the socket to expose the filter screen 162, the second spring 23 is released from the extrusion of the first spring 1611 and resets to drive the adsorption plate 22 to insert into the socket, so as to block the socket and ensure the filtering effect of the flue gas.

[0077] On the basis of any of the above embodiments, the filtering structure further comprises a filtering piece arranged in the second cavity 143, and the second cavity 143 is provided with a through hole 1431 communicating with the second hollow cavity 15.

[0078] Please refer to Figure 2 , Figure 3 , the filtering piece can be a filtering bead or a filtering magnet filled in the second cavity 143 or a material having the ability to adsorb harmful substances.

[0079] The second cavity 143 is provided with a through hole 1431 in communication with the second hollow cavity 15, and the push plate 163 is initially close to the through hole 1431 and gradually moves away from the through hole 1431 under the action of the flue gas pressure in the second hollow cavity 15, so that the push plate 163 drives the cleaning plate 164 to move to leak the flue gas inlet 166, thereby avoiding affecting the filtering operation of the flue gas.

[0080] On the basis of any of the above embodiments, one side of the accommodating part 11 is in communication with a smoke cavity 12, and the smoke cavity 12 is in communication with the first hollow cavity 14 through a plurality of flue ducts 13.

[0081] Please refer to Figure 2 The smoke cavity 12 is in communication with the first hollow cavity 14 through the flue duct 13, the first hollow cavity 14 is in communication with the second hollow cavity 15, the flue gas generated by the cigarette enters the inside of the smoke cavity 12 from the accommodating part 11, and then flows into the inside of the first hollow cavity 14 and the second hollow cavity 15 along the flue duct 13 for filtering.

[0082] The specific structure of the smoke cavity 12 and the flue duct 13 is not limited, and can be designed flexibly as long as the actual demand is met.

[0083] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0084] The above describes in detail the filtering device provided by the application. The principle and implementation mode of the application are described by applying specific examples. The above embodiment is only used to help understand the method and core idea of the application. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the application, the application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A filtration device, characterized in that, include: Suction nozzle (30); The filter housing (10) is connected to the mouthpiece (30) and has an internal receiving part (11) for receiving a cigarette. The filter housing (10) includes a first hollow cavity (14) communicating with the receiving part (11). The diameter of the first hollow cavity (14) decreases from the end to the middle. The middle of the first hollow cavity (14) is provided with multiple diversion channels (142). The second hollow cavity (15) is located inside the first hollow cavity (14) near the end of the suction nozzle (30); The filter structure is provided in both the first hollow cavity (14) and the second hollow cavity (15). The smoke from the cigarette can be filtered through the first hollow cavity (14) and the second hollow cavity (15) in sequence and then sent to the mouthpiece (30). The filter structure includes a filter (16) disposed in the second hollow cavity (15). The filter (16) includes a filter tube (161). The filter tube (161) is provided with a plurality of sliding parts. The sliding parts are slidably connected to a push plate (163). One end of the push plate (163) is connected to the sliding part through a first spring (1611). After the flue gas enters the second hollow cavity (15), it can push the push plate (163) to move and squeeze the first spring (1611) away from the mouthpiece (30). A connector (20) is provided between the suction nozzle (30) and the filter housing (10). The connector (20) includes a connecting housing (21). An adsorption plate (22) is slidably connected to the side of the connecting housing (21) close to the filter housing (10). The adsorption plate (22) is connected to the connecting housing (21) by a second spring (23). The first spring (1611) presses the second spring (23) in the initial state to press the adsorption plate (22).

2. The filtration device according to claim 1, characterized in that, The first hollow cavity (14) includes a first cavity (141) and a second cavity (143) that are interconnected. The first cavity (141) is connected to the receiving part (11), and the second cavity (143) is located close to the suction nozzle (30) and has the filter structure inside.

3. The filtration device according to claim 2, characterized in that, The first cavity (141) and the second cavity (143) are connected by a connecting part. The diameters of the first cavity (141) and the second cavity (143) decrease along the direction close to the connecting part. Multiple diversion channels (142) are evenly distributed in the circumferential direction of the connecting part.

4. The filtration device according to claim 2 or 3, characterized in that, The filter tube (161) is disposed in the second hollow cavity (15) and has a plurality of flue gas inlets (166); the filter (16) further includes: A filter screen (162) is disposed on the outside of the filter tube (161); A cleaning plate (164) is movably disposed on the outside of the filter screen (162) for cleaning the filter screen (162). The connecting pipe (165) is connected to the filter pipe (161) and the mouthpiece (30) at both ends. The flue gas is filtered by the filter screen (162) and enters the filter pipe (161) through the flue gas inlet (166), and is then transported to the mouthpiece (30) through the connecting pipe (165).

5. The filtration device according to claim 4, characterized in that, The end of the push plate (163) away from the sliding part is connected to the cleaning plate (164).

6. The filtration device according to claim 5, characterized in that, The connector (20) includes a connecting housing (21), and the nozzle (30) and the filter housing (10) are detachably connected to the connecting housing (21).

7. The filtration device according to claim 6, characterized in that, The filter housing (10) is provided with an insertion port. The cleaning plate (164) passes through the insertion port and abuts against the adsorption plate (22). After the cleaning plate (164) moves out of the insertion port, the second spring (23) resets to drive the adsorption plate (22) to insert into the insertion port.

8. The filtration device according to claim 7, characterized in that, The filter structure also includes a filter element disposed in the second cavity (143), and the second cavity (143) has a through hole (1431) communicating with the second hollow cavity (15).

9. The filtration device according to claim 8, characterized in that, The receiving part (11) is connected to a smoke chamber (12) on one side, and the smoke chamber (12) is connected to the first hollow cavity (14) through a number of flues (13).

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