CN113915654A

CN113915654A - Oil fume filtering device, range hood and oil fume filtering method

Info

Publication number: CN113915654A
Application number: CN202111254543.2A
Authority: CN
Inventors: 张岩; 梁雪斐; 王发银; 韩国强
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-01-11
Anticipated expiration: 2041-10-27
Also published as: CN113915654B

Abstract

The invention relates to an oil smoke filtering device, which comprises a filtering component, a first filtering component and a second filtering component, wherein the filtering component comprises a first cylindrical filtering piece and a second cylindrical filtering piece; and the first driving mechanism is in driving connection with the first filtering piece and the second filtering piece respectively. The invention also relates to a range hood which comprises a smoke collecting hood, a fan, a connecting hood connected between the outlet of the smoke collecting hood and the inlet of the fan and a filtering device arranged in the connecting hood. The invention also relates to a lampblack filtering method of the range hood, wherein the driving rotating speed of the second filtering piece is adjusted according to the lampblack concentration; the first filter piece is driven according to noise data control, and then the air inlet area of the distribution area of the first filter piece facing the oil smoke entering direction is adjusted. This oil smoke filter equipment can realize that the dynamic separation of oil smoke compromises the solution noise problem on effectively guaranteeing oil smoke filter effect's basis.

Description

Oil fume filtering device, range hood and oil fume filtering method

Technical Field

The invention relates to an oil fume filtering device and a range hood applying the oil fume filtering device.

Background

The range hood is indispensable as the kitchen electrical apparatus that the family must possess, and it can discharge some oil smoke and harmful gas that produce in the culinary art process, is the essential electrical apparatus of indoor cleanness in kitchen. But the oil smoke that produces among the culinary art process can pollute inside the range hood, and then makes the inside cleanness of range hood be a big problem always, in order to reduce the inside pollution of oil smoke to the range hood, the more commonly used mode is just to install the filter screen in range hood air intake department and carry out the filter action of oil smoke.

In order to improve the effect of oil smoke absorption, a multi-layer filter screen structure is usually adopted, for example, in chinese patent application publication No. CN112212379A (application No. 202011204976.2) entitled "an oil smoke purification system", in which the disclosed oil smoke separation screen includes an outer layer air screen, a middle layer air screen and an inner layer air screen, and the grids of the outer layer air screen, the middle layer air screen and the inner layer air screen are arranged in a staggered manner to form a zigzag air duct. If the oil filter plate is made of stainless steel wires as in the patent of chinese utility model with the publication number CN20953364U (application number 201920152020.9), the oil filter plate disclosed therein also has a multi-layer structure and adopts a mesh structure, and is further used for separating and filtering small-particle oil stains in oil smoke. And these oil smoke filtration is all static settings, and is relatively poor to the separation effect of oil smoke.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a lampblack filtering device capable of realizing dynamic separation of lampblack to improve the lampblack filtering effect, and simultaneously adjusting the air inlet area for the lampblack to enter the filtering device, so as to solve the noise problem while effectively ensuring the lampblack filtering effect.

The second technical problem to be solved by the present invention is to provide a range hood using the aforementioned filtering device in view of the above prior art.

The third technical problem to be solved by the present invention is to provide a method for filtering oil smoke of the aforementioned range hood in view of the above prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: an oil smoke filter equipment which characterized in that: comprises that

The filter assembly comprises a first cylindrical filter element and a second cylindrical filter element, the first filter element is sleeved outside the second filter element, a first opening is formed in the first filter element, the first opening forms distribution areas with different air inlet areas on the first filter element, and a second opening is formed in the second filter element;

the first driving mechanism is in driving connection with the first filtering piece and the second filtering piece respectively and drives the first filtering piece and the second filtering piece to rotate respectively.

In order to conveniently adjust the distance between the filter assembly and the fan and further adjust the noise generated by the interaction between the fan and the filter assembly, the fan-type air conditioner further comprises a second driving mechanism for driving the filter assembly to be close to and far away from the fan.

Preferably, guide rails for guiding the filter assembly to move relative to the fan are respectively arranged at two ends of the filter assembly, and guide blocks matched with the guide rails are arranged at two ends of the filter assembly.

The structure is simple, the second driving mechanism is a motor, the guide rail at one end of the filter assembly is a screw rod connected to the driving end of the motor, the guide rail at the other end of the filter assembly is a guide rod, and the corresponding guide blocks are respectively sleeved on the screw rod and the guide rod in a matching mode.

In order to facilitate installation, two ends of the filtering component are respectively provided with an installation frame for installing a guide rail.

In order to facilitate the relative installation between the first filter element and the second filter element and also facilitate the driving of the first filter element and the second filter element, two ends of the second filter element are provided with connecting shafts penetrating to the outside of the end plate of the first filter element, and two ends of the first filter element are rotatably connected to the connecting shafts through bearings;

the first driving mechanism comprises a first driving motor, a first gear sleeved on a motor shaft of the first driving motor, and a second gear sleeved outside a bearing at one end and meshed with the first gear;

the first driving mechanism further comprises a second driving motor in driving connection with the connecting shaft.

The structure is simple, the first filter piece is divided into at least two distribution areas along the circumferential direction;

the second filter piece is provided with second openings along the circumferential direction and the axial direction in a matrix distribution mode.

Preferably, the first openings are circular, and the pore diameters of the first openings on the distribution areas are different; the second trompil is the bar and extends along second filter axial.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides a range hood, includes collection petticoat pipe, fan and connects the connection cover between the export of collection petticoat pipe and fan entry, its characterized in that: the filter device is arranged in the connecting cover.

In order to accurately acquire the concentration condition of the oil smoke entering the range hood in real time, an oil smoke concentration sensor is arranged in the connecting cover.

Preferably, both ends of the filtering component are provided with the oil smoke concentration sensors.

In order to facilitate the disassembly and assembly of the filtering assembly and the disassembly and cleaning of the filtering assembly, a door body which can be opened and closed is arranged on the connecting cover corresponding to the filtering device.

In order to reduce noise, prolong oil smoke passageway path length simultaneously, improve the condensation treatment effect to the oil smoke, the fan setting is in the top of house furred ceiling.

In order to improve the utilization of the space at the front side of the connecting cover by a user, the connecting cover is flatly arranged and is arranged at the position of the smoke collecting cover deviated to the rear side.

In order to obtain the noise condition that range hood used in real time, and then in time know the noise pollution condition to the user to conveniently carry out filtering component's control in order to reduce the noise, be provided with noise sensor on the collection hood.

Preferably, an oil cup is arranged below the fume collecting hood, and a flow guide channel connected with the oil cup is arranged on the first filter piece.

The technical scheme adopted by the invention for solving the third technical problem is as follows: a method for filtering cooking fumes in a range hood as claimed in claims 9 to 16, wherein: detecting and acquiring the concentration of the oil smoke entering the smoke collecting hood, and adjusting the driving rotating speed of the second filter piece according to the concentration of the oil smoke;

the detection obtains the noise data of range hood work, controls the first filter piece of drive according to the noise data, and then adjusts the first filter piece towards the air inlet area of the distribution region of oil smoke entering direction.

In order to ensure that the noise and the working energy consumption of the filtering component are reasonably coordinated on the basis of a good oil fume treatment effect, the larger the oil fume concentration is, the higher the driving rotating speed of the second filtering piece is controlled and regulated.

As an improvement, noise data of the range hood during operation are acquired according to real-time detection, and on the basis of adjusting the air inlet area of the distribution area of the first filter piece facing the oil smoke entering direction, the distance between the filter assembly and the fan and/or the driving rotating speed of the second filter screen are/is adjusted, so that the noise of the range hood during operation is reduced.

Preferably, in the working process of the range hood, under the condition that the second filter member rotates, if the noise data exceeds a set threshold value, the first filter member is controlled to rotate, and then a distribution area with a smaller air inlet area in the first filter member faces the direction of an oil smoke inlet;

when the distribution area with the minimum air inlet area in the first filter element faces the direction of the oil smoke inlet, if the noise data still exceeds the set threshold value, the driving filter assembly is controlled to move to a position far away from the fan;

and when the driving filter assembly moves to a position farthest away from the fan, if the noise data still exceeds a set threshold value, controlling to reduce the driving speed of the second filter piece.

Preferably, after the range hood stops working, the first filter member is controlled and driven to reset to an initial position, and the initial position of the first filter member is that a distribution area with the largest air inlet area on the first filter member faces the direction of the oil smoke inlet;

when the range hood stops working, the control drive filter assembly resets to the initial position, and the initial position of the filter assembly is the position closest to the fan.

Preferably, when the range hood is started, if the detected oil smoke concentration is 0, the filter assembly is controlled to keep a static state;

when the range hood stops working, if the detected oil smoke concentration is 0, the second filter member is controlled to rotate forwards for a first time length and then rotate backwards for a second time length according to the highest driving rotating speed of the second filter member.

Compared with the prior art, the invention has the advantages that: according to the oil fume filtering device, through the structural design of the first filtering piece and the second filtering piece, the oil fume can be dynamically separated, so that the oil fume filtering effect is improved, and meanwhile, grease can be thrown onto the inner wall surface of the first filtering piece through the centrifugal effect of the second filtering piece, so that the oil fume filtering effect is further improved. In addition, through the drive to first filter, can adjust the oil smoke volume that enters into in the filtering component, the noise problem in the effective control working process, and then realize filtering and the reasonable balance of noise.

The range hood with the oil fume filtering component has a good oil fume filtering effect, can effectively take the noise problem into account in the working process, and improves the user experience.

The oil smoke filtering method of the range hood can achieve reasonable balance between the filtering effect and the working noise, and the using effect is high.

Drawings

Fig. 1 is a perspective view of a range hood in an embodiment of the present invention.

Fig. 2 is an internal structural view of fig. 1.

Fig. 3 is a perspective view of the oil smoke filtering device in the embodiment of the invention.

Fig. 4 is a cross-sectional view of fig. 3.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The oil smoke filtering device 400 in this embodiment can be applied to various range hoods in the prior art, and the embodiment takes a range hood with a long smoke path as an example, and the detailed structures of the oil smoke filtering device 400 and the range hood applying the oil smoke filtering device 400 are described in detail.

As shown in fig. 1 and 2, the range hood of the present invention includes a smoke collecting hood 100, a fan 200, a connection hood 300 connected between an outlet of the smoke collecting hood 100 and an inlet of the fan 200, and a filtering device 400 disposed in the connection hood 300.

Fan 200 in this implementation sets up the top at house furred ceiling, so can reduce fan 200 during operation to user's noise pollution. This setting position can also prolong the flow path of oil smoke simultaneously, and then the reinforcing is to the condensation effect of oil smoke, utilizes the processing that realizes the oil smoke, and then avoids getting into the oil smoke volume in fan 200, reduces the greasy dirt pollution to fan 200. Because the fan 200 is arranged, the length of the connection cover 300 is correspondingly increased, the connection cover 300 can be arranged to be a flat structure parallel to the wall surface, and the connection cover 300 is arranged at the position of the exhaust fume collecting cover 100 which is deviated to the rear side, so that the occupation of the connection cover 300 on the front cooking space is reduced, and the operation space of the cooking work is increased.

In order to facilitate the assembly and disassembly of the filter device 400 in the range hood, the openable door body 301 is arranged on the connecting cover 300 at a position corresponding to the filter device 400, so that the filter device 400 can be assembled and disassembled in the connecting cover 300 by opening the door body 301, and the operation is very convenient.

As shown in fig. 3 and 4, the soot filter device 400 includes a filter assembly 1, a first driving mechanism, and a second driving mechanism 2. Wherein filter assembly 1 is including being the first filter piece 11 and the second filter piece 12 of tube-shape, and first filter piece 11 cover is established outside the second filter piece 12, and in this embodiment, first filter piece 11 and second filter piece 12 set up with one heart. The first driving mechanism is respectively in driving connection with the first filter piece 11 and the second filter piece 12, and then respectively drives the first filter piece 11 and the second filter piece 12 to rotate. The second driving mechanism 2 is used for driving the filtering component 1 to be close to and far away from the fan 200, so that the influence of noise on a user can be conveniently adjusted.

Specifically, first filter piece 11, second filter piece 12 all include that the cross-section is circular shape perisporium and closing cap setting at the end plate at perisporium both ends, wear to establish a body of rod along axial extension in the first filter piece 11, and the body of rod passes the second respectively and filters the end plate central point at 12 both ends and puts to this body of rod and second filter piece 12 fixed connection, and then the body of rod can the synchronization action with second filter piece 12. And the body of rod both ends lie in the second and strain the outer part of 12 end plates and then form the connecting axle 5 that is used for connecting first filtration piece 11, and the second is strained the connecting axle 5 at 12 both ends and is also corresponding worn outside the end plate of first filtration piece 11 to the first both ends of straining piece 11 are passed through bearing 6 and are connected on connecting axle 5, can realize first filtration piece 11 and the asynchronous rotation relation of second filtration piece 12 through bearing 6.

First trompil 111 has been seted up on the first filter piece 11, and first trompil 111 forms the distribution region of different air inlet areas on first filter piece 11, has seted up second trompil 121 on the second filter piece 12. Specifically, the first filter member 11 is divided into at least two distribution regions along the circumferential direction, in this embodiment, four distribution regions are arranged along the circumferential direction, one distribution region is arranged every 90 ° along the circumferential direction, each distribution region is provided with a plurality of first openings 111, and the air inlet areas formed by the first openings 111 are different. The distribution pattern of the first openings 111 and the shape of the openings may be specifically set as desired. In this embodiment, the first openings 111 are circular, and the apertures of the first openings 111 in each distribution area are different, so as to form distribution areas with different air inlet areas. During operation, can drive a distribution area on the first filter piece 11 and face into cigarette direction, different distribution areas correspond and get into different cigarette volumes in filter assembly 1, and the air inlet area is big more, and then the oil smoke volume that gets into in filter assembly 1 is also big more. The soot which does not enter the filter element 1 moves in the smoke evacuation direction from the gap between the filter element 1 and the wall of the connecting cover 300.

The second filter member 12 is provided with second openings 121 distributed in a matrix along the circumferential direction and the axial direction, and the second openings 121 in this embodiment are strip-shaped and extend along the axial direction of the second filter member 12. During operation, the second filter member 12 is actively rotated to filter the oil smoke, and after the oil smoke enters the second filter member 12 through the second opening 121, the oil smoke can be filtered by blocking the oil smoke. On the other hand, the second filter member 12 rotates under the drive of the first driving mechanism, so that the second filter member 12 can throw the grease on the inner wall surface of the first filter member 11 through the rotating centrifugal force, the filtering effect on the oil smoke is improved, meanwhile, the oil smoke is prevented from being thrown in the fan 200, and the cleanness of the fan 200 is improved. In addition, in order to collect the oil stain on the inner wall of the first filter member 11, an oil cup may be disposed below the smoke collecting cover 100, and the first filter member 11 is provided with a flow guiding channel connected with the oil cup. If a diversion trench structure can be arranged in the first filtering member 11, the diversion trench can be connected with the oil cup through a connection structure with the inner wall of the connecting cover 300 or through a pipe and other parts, so that a diversion channel is formed, and the oil stain on the first filtering member 11 can be conveniently guided out.

The first driving mechanism comprises a first driving motor 7, a first gear 71 sleeved on a motor shaft of the first driving motor 7, and a second gear 72 sleeved outside the one-end bearing 6 and meshed with the first gear 71. Need drive first filtration piece 11 and rotate and when adjusting the air inlet area, then control first driving motor 7 and carry out work, first driving motor 7 drive first gear 71 rotates, and corresponding electronic second gear 72 also rotates, and the part of being connected with first filtration piece 11 in the bearing 6 then rotates like this, and then drives first filtration piece 11 and rotates, realizes the regulation of different distribution region orientation towards advancing the cigarette direction.

First actuating mechanism still includes the second driving motor 8 with connecting axle 5 drive connection, when needing the drive second to filter piece 12 and rotate, then control second driving motor 8 and carry out work, and then the drive second filters piece 12 and rotates to the realization is filtered the developments of oil smoke.

The second driving mechanism 2 is a motor, in order to ensure the driving stability of the filter assembly 1 in the moving direction, guide rails for guiding the filter assembly 1 to move relative to the fan 200 are respectively arranged at the two ends of the filter assembly 1, and guide blocks 4 matched with the guide rails are arranged at the two ends of the filter assembly 1. For convenience of installation, in the present embodiment, the two ends of the filter assembly 1 are respectively provided with the mounting brackets 3 for mounting the guide rails, and the mounting brackets 3 are fixedly mounted on the inner wall of the connecting cover 300. The guide rail that is located filter assembly 1 one end is the lead screw 31 of connection at the drive end of motor, and during the installation, motor fixed mounting is on mounting bracket 3, and lead screw 31 then can be for the drive end of the pivoted connection at the motor of mounting bracket 3. The guide rail at the other end of the filter assembly 1 is a guide rod 32, the guide rod 32 is fixedly connected to the mounting frame 3, and the corresponding guide blocks 4 are respectively sleeved on the screw rod 31 and the guide rod 32 in a matching manner. During operation, the motor works to drive the screw rod 31 to rotate, the guide block 4 connected to the screw rod 31 is in threaded connection with the screw rod 31, and then along with the rotation of the screw rod 31, the guide block 4 is driven to move relative to the screw rod 31, and the filter assembly 1 is correspondingly driven to move relative to the position of the fan 200. When the filter assembly 1 is close to the fan 200, noise is generated based on the influence of the air flow and the smoke when the second filter member 12 rotates. When the filter assembly 1 is far from the fan 200, the corresponding noise is also reduced. Thus, the noise can be adjusted by adjusting the position of the filter assembly 1 relative to the fan 200. In this embodiment, the connection cover 300 extends in the vertical direction, so that the second driving mechanism 2 drives the adjusting filter assembly 1 to move up and down, thereby realizing the distance adjustment relative to the fan 200.

In addition, be equipped with oil smoke concentration sensor in connecting cover 300 in order to be used for detecting the oil smoke concentration condition, in this embodiment, all be provided with oil smoke concentration sensor at the both ends of filter assembly 1, and then the near oil smoke concentration condition of real-time detection filter assembly 1, and then more conveniently realize the drive control to filter assembly 1.

The smoke collecting hood 100 is provided with a noise sensor, the noise sensor can adopt various noise sensors in the prior art, and the arrangement position of the noise sensor can effectively realize the monitoring of the influence degree of noise on a user.

According to the oil smoke filtering method of the range hood, the oil smoke sensor is used for detecting and acquiring the concentration of oil smoke entering the smoke collecting hood 100, particularly the concentration of oil smoke near the filtering component, and then the driving rotating speed of the second filtering piece 12 is adjusted according to the concentration of the oil smoke. The oil smoke concentration is big more, and the control is used for driving second filtration piece 12 to carry out the higher than the pivoted 8 rotational speeds of second driving motor, and then the control regulation is higher to the drive rotational speed of second filtration piece 12, so better realization oil smoke granule and air separation, and then improve oil smoke filter effect.

In order to guarantee that the noise in the oil smoke filtering work is reasonable, when the oil smoke filtering work is carried out, the noise sensor is utilized to detect and acquire the noise data of the work near the smoke collecting range of the range hood, and the noise data of the smoke collecting range accessory can more accurately reflect the influence of noise on a user. Therefore, the first filtering piece 11 can be controlled and driven according to the noise data, and the air inlet area of the distribution area of the first filtering piece 11 facing the oil smoke entering direction is adjusted. In general, if noise is to be reduced, the distribution area with smaller air inlet area in the first filter 11 is controlled to face the smoke inlet direction, so that the amount of smoke entering the filter assembly 1 is reduced, wind noise is improved, accordingly, noise generated during rotation of the second filter 12 is relatively reduced, and the rest of the smoke moves toward the smoke exhaust direction through the gap between the filter assembly 1 and the connecting cover 300. Meanwhile, the rotating speed of the second filter member 12 is adjusted along with the oil smoke concentration, so that the problems of poor oil smoke filtering effect caused by too small rotating speed, high noise, energy waste and the like caused by too large rotating speed under the working condition of single rotating speed are avoided.

The noise data of the range hood work is obtained according to real-time detection, on the basis of adjusting the air inlet area of the distribution area of the first filtering piece 11 facing the oil fume entering direction, if the noise data is still not lower than the set noise threshold value, the distance between the filtering component 1 and the fan 200 and/or the driving rotating speed of the second filtering net can be adjusted in a combined mode, and then the noise in the range hood work process is reduced.

Specifically, when the range hood is started, if the detected oil smoke concentration is 0, the filter assembly 1 is controlled to keep a static state. When the oil smoke concentration is not 0, in the working process of the range hood, under the condition that the second filter member 12 rotates, if the noise data exceeds a set threshold value, the first filter member 11 is controlled to rotate, and then the distribution area with the smaller air inlet area in the first filter member 11 faces the oil smoke inlet direction. In this embodiment, the first filter element 11 has four distribution areas, which are gradually adjusted according to the size of the air inlet area until the noise data is reduced below a predetermined threshold. Under the condition that the distribution area with the minimum air inlet area in the first filter element 11 faces the direction of an oil fume inlet, if the noise data still exceeds a set threshold value, the second filter element 1 is controlled to move to a position far away from the fan 200, high noise generated by fluid interaction between the second filter element 12 in the filter element 1 and the fan 200 during operation is further reduced, the second driving mechanism 2 is controlled to operate at the moment, the filter element 1 is further driven to move to a position far away from the fan 200, adjustment is carried out according to a set unit adjustment distance during adjustment, and after each adjustment, the noise data is detected until the noise data is reduced to be below the set threshold value. If the noise data still exceeds the set threshold while the drive filter assembly 1 is moved to the position farthest from the fan 200, the control reduces the driving rotational speed of the second filter member 12. The drive rotational speed of the second filter element 12 is usually set to a plurality of steps, and the drive rotational speed of only one or two steps is usually reduced to ensure a dynamic filter effect of the second filter element 12. Of course, if the rotation speed of the second filter 12 itself is low under the condition of low oil smoke concentration, the driving rotation speed of the second filter 12 can be reduced to 0, so that the first filter 11 and the second filter 12 are in a static filtering state, thereby realizing the filtering effect on the oil smoke and reducing the working noise.

After cooking is finished, generally, the oil smoke is not sucked completely, the fan 200 generally continues to perform oil smoke sucking operation until the oil smoke concentration is reduced to 0, and then the fan 200 in the range hood stops operating. When the range hood stops working, if the detected oil smoke concentration is 0, the second filter member 12 is controlled to rotate forwards for a first time according to the highest driving rotating speed of the second filter member 12, and then rotate backwards for a second time, so that the oil drops stuck on the second filter member 12 in each working process can be thrown onto the inner wall of the first filter member 11 as much as possible, and then the oil drops are guided into the oil cup, so that the cleaning effect is achieved.

After the range hood stops working, on the basis that the filter assembly completes the work, the first filter piece 11 is controlled and driven to reset to the initial position, and the initial position of the first filter piece 11 is the direction of the oil smoke inlet facing the distribution area with the largest air inlet area on the first filter piece 11. When the range hood stops working, the control driving filtering component 1 resets to the initial position, the initial position of the filtering component 1 is the position closest to the fan 200, and further, when the range hood initially works, the oil smoke has a longer flow path when entering the filtering component, so that the oil smoke is fully condensed, the oil smoke treatment effect is improved, the bonding amount of the oil smoke on the fan 200 is reduced as much as possible, and the long-term effective work of the fan 200 is ensured. And the filter assembly can be disassembled for cleaning by opening the door body 301 on the connection cover 300.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the invention, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Claims

1. An oil smoke filter equipment which characterized in that: comprises that

The filter assembly (1) comprises a first cylindrical filter element (11) and a second cylindrical filter element (12), wherein the first cylindrical filter element (11) is sleeved outside the second cylindrical filter element (12), the first cylindrical filter element (11) is provided with a first open hole (111), the first open hole (111) forms distribution areas with different air inlet areas on the first cylindrical filter element (11), and the second cylindrical filter element (12) is provided with a second open hole (121);

the first driving mechanism is in driving connection with the first filtering piece (11) and the second filtering piece (12) respectively and drives the first filtering piece (11) and the second filtering piece (12) to rotate respectively.

2. The oil smoke filtering device of claim 1, wherein: the fan filter further comprises a second driving mechanism (2) for driving the filter assembly (1) to be close to and far away from the fan (200).

3. The oil smoke filtering device of claim 2, wherein: the two ends of the filter assembly (1) are respectively provided with a guide rail for guiding the filter assembly (1) to move relative to the fan (200), and the two ends of the filter assembly (1) are provided with guide blocks (4) matched with the guide rails.

4. The oil smoke filtering device of claim 3, wherein: the second driving mechanism (2) is a motor, the guide rail at one end of the filter assembly (1) is a screw rod (31) connected to the driving end of the motor, the guide rail at the other end of the filter assembly (1) is a guide rod (32), and the corresponding guide blocks (4) are respectively sleeved on the screw rod (31) and the guide rod (32) in a matching mode.

5. The oil smoke filtering device of claim 3, wherein: and mounting frames (3) for mounting guide rails are respectively arranged at two ends of the filtering component (1).

6. The oil smoke filtering device of any one of claims 1 to 5, wherein: two ends of the second filter piece (12) are provided with connecting shafts (5) penetrating to the outside of the end plate of the first filter piece (11), and two ends of the first filter piece (11) are rotatably connected to the connecting shafts (5) through bearings (6);

the first driving mechanism comprises a first driving motor (7), a first gear (71) sleeved on a motor shaft of the first driving motor (7), and a second gear (72) sleeved outside the bearing (6) at one end and meshed with the first gear (71);

the first driving mechanism further comprises a second driving motor (8) in driving connection with the connecting shaft (5).

7. The oil smoke filtering device of any one of claims 1 to 5, wherein: the first filter element (11) is divided into at least two distribution areas along the circumferential direction;

the second filter elements (12) are provided with second openings (121) distributed in a matrix along the circumferential direction and the axial direction.

8. The oil smoke filtering device of claim 7, characterized in that: the first openings (111) are circular, and the aperture of the first openings (111) on each distribution area is different; the second opening (121) is strip-shaped and extends axially along the second filter element (12).

9. The utility model provides a range hood, includes collection petticoat pipe (100), fan (200) and connects connection cover (300) between the export of collection petticoat pipe (100) and fan (200) entry, its characterized in that: further comprising a filter device (400) according to any of claims 1 to 8, which is arranged in the connecting hood (300).

10. The range hood of claim 9, wherein: an oil smoke concentration sensor is arranged in the connecting cover (300).

11. The range hood of claim 10, wherein: and the two ends of the filtering component (1) are provided with the oil smoke concentration sensors.

12. The range hood of claim 9, wherein: the position of the connecting cover (300) corresponding to the filtering device is provided with a door body (301) which can be opened and closed.

13. The range hood of claim 9, wherein: the fan (200) is arranged above the suspended ceiling of the house.

14. The range hood of claim 13, wherein: the connecting cover (300) is flatly arranged and is arranged at a position of the exhaust fume collecting cover (100) deviated to the rear side.

15. The range hood of claim 9, wherein: the smoke collecting hood (100) is provided with a noise sensor.

16. The range hood of claim 9, wherein: an oil cup is arranged below the fume collecting hood (100), and a flow guide channel connected with the oil cup is arranged on the first filtering piece (11).

17. A method for filtering cooking fumes in a range hood as claimed in claims 9 to 16, wherein: detecting and acquiring the concentration of the oil smoke entering the smoke collecting hood (100), and adjusting the driving rotating speed of the second filter piece (12) according to the concentration of the oil smoke;

the detection obtains the noise data of range hood work, controls the first filter piece (11) of drive according to the noise data, and then adjusts first filter piece (11) and gets into the air inlet area of the distribution region of direction towards the oil smoke.

18. The lampblack filtering method according to claim 17, characterized in that: the larger the oil smoke concentration is, the higher the driving rotating speed of the second filter element (12) is controlled and adjusted.

19. The lampblack filtering method according to claim 17, characterized in that: noise data of the range hood during operation are acquired according to real-time detection, and on the basis of adjusting the air inlet area of the distribution area of the first filter piece (11) facing the oil smoke entering direction, the distance between the filter assembly (1) and the fan (200) and/or the driving rotating speed of the second filter screen are/is adjusted, so that the noise of the range hood during operation is reduced.

20. The lampblack filtering method according to claim 19, characterized in that: in the working process of the range hood, under the condition that the second filter piece (12) rotates, if the noise data exceeds a set threshold value, the first filter piece (11) is controlled to rotate, and then a distribution area with a smaller air inlet area in the first filter piece (11) faces to the direction of an oil smoke inlet;

when the distribution area with the smallest air inlet area in the first filter piece (11) faces the direction of the oil smoke inlet, if the noise data still exceeds the set threshold value, the driving filter assembly (1) is controlled to move to a position far away from the fan (200);

when the driving filter assembly (1) moves to a position farthest away from the fan (200), if the noise data still exceeds a set threshold value, the driving speed of the second filter member (12) is controlled to be reduced.

21. The lampblack filtering method according to claim 20, characterized in that: when the range hood stops working, the first filtering piece (11) is controlled and driven to reset to an initial position, and the initial position of the first filtering piece (11) is that the distribution area with the largest air inlet area on the first filtering piece (11) faces the direction of an oil smoke inlet;

when the range hood stops working, the filter assembly (1) is controlled and driven to reset to the initial position, and the initial position of the filter assembly (1) is the position closest to the fan (200).

22. The lampblack filtering method according to claim 20, characterized in that: when the range hood is started, if the detected oil smoke concentration is 0, the filter assembly (1) is controlled to keep a static state;

when the range hood stops working, if the detected oil smoke concentration is 0, the second filter member (12) is controlled to rotate forwards for a first time length and then reversely for a second time length according to the highest driving rotating speed of the second filter member (12).