Lampblack filtering device and range hood

Abstract

The utility model relates to the technical field of range hoods, and particularly discloses a lampblack filtering device and a range hood, the lampblack filtering device comprises a shell, a fan and a motor, and the shell is provided with a smoke channel for conveying lampblack; the fan is installed on the shell and located in the smoke channel, the fan comprises a plurality of blades, and the blades are provided with a plurality of filtering holes; the motor is installed on the shell and is in transmission connection with the fan. In the oil smoke filtering device, oil smoke can collide with the blades, solid particles and oil drops with large mass in the oil smoke are blocked through the blades, clean gas with light mass can smoothly penetrate through the blades through the filtering holes, the filtering effect is achieved, and wind resistance can be reduced; the blades can also drive the oil fume to rotate, and under the action of centrifugal force, large-mass solid particles and oil drops in the oil fume can be promoted to be thrown to the shell, so that the filtering effect on the oil fume is enhanced; and rotation of the blades is equivalent to increase of the contact area of the blades and the lampblack in unit time, so that the filtering effect on the lampblack can be further enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a fume filtering device and a range hood. Background Art

[0002] At present, a large amount of oil fume is often produced during the processing in restaurants and home kitchens. This oil fume contains more oil and harmful chemicals. If it is directly discharged into the atmosphere without treatment, it will cause great harm to the environment and human body. Therefore, it is necessary to filter the exhaust fume.

[0003] In the prior art, the oil smoke discharged to the outside is usually filtered by an oil smoke filter device, which includes a filter plate, which is fixed in the smoke channel of the smoke exhaust pipe. When the oil smoke collides with the filter plate, it can block the larger solid particles and oil droplets in the oil smoke from passing through, thereby filtering the oil smoke. However, this filtering method has limited ability to filter oil smoke. Utility Model Content

[0004] The purpose of the utility model is to provide an oil fume filtering device and a range hood to enhance the oil fume filtering capability of the oil fume filtering device.

[0005] In one aspect, the utility model provides an oil fume filtering device, the oil fume filtering device comprising:

[0006] A shell body having a smoke passage for conveying oil smoke;

[0007] A fan is installed in the housing and is located in the smoke passage. The fan includes a plurality of blades, and the blades are provided with a plurality of filter holes; and

[0008] The motor is installed on the housing and is drivingly connected to the fan.

[0009] As a preferred technical solution of the oil fume filtering device, the fan further includes a drum, the drum is located in the smoke passage, the drum is rotatably connected to the shell, and the motor is transmission-connected to the drum;

[0010] The drum has an inner cavity, one end of the inner cavity is provided with a first opening, the other end of the inner cavity is provided with a second opening, and the first opening is connected to the smoke channel, the second opening is connected to the smoke channel, and a plurality of blades are arranged on the cavity wall of the inner cavity at intervals along the circumferential direction of the drum.

[0011] As a preferred technical solution for the oil fume filtering device, the housing is provided with an avoidance hole, the avoidance hole is connected to the smoke channel, and the motor is located outside the smoke channel;

[0012] The oil fume filtering device also includes a driving wheel, the output shaft of the motor is drivingly connected to the driving wheel, and the driving wheel passes through the avoidance hole and is drivingly connected to the drum.

[0013] As a preferred technical solution of the oil fume filtering device, an annular groove is provided on the inner wall of the smoke channel, and the drum is rotatably disposed in the annular groove.

[0014] As a preferred technical solution of the oil fume filtering device, the oil fume filtering device also includes a bearing, which is arranged between the drum and the bottom surface of the annular groove, and the outer circumferential surface of the drum is spaced apart from the bottom surface of the annular groove.

[0015] As a preferred technical solution of the oil fume filtering device, the housing is also provided with an oil drain hole, which is connected to the bottom of the annular groove;

[0016] The oil fume filtering device also includes an oil collecting tank, which is fixed below the shell and communicated with the oil drain hole.

[0017] As a preferred technical solution of the oil fume filtering device, the oil fume filtering device also includes a spray device, which is arranged upstream of the fan in the direction of conveying the oil fume along the smoke channel, and is used to spray water mist into the smoke channel.

[0018] As a preferred technical solution for the oil fume filtering device, the motor rotates forward, and the direction of the airflow driven by the fan is the same as the direction in which the oil fume is transported by the smoke channel; or

[0019] The motor is reversed, and the direction of the airflow driven by the fan is opposite to the direction in which the smoke is transported by the smoke duct.

[0020] As a preferred technical solution for the oil fume filtering device, the end surface of the blade is streamlined.

[0021] On the other hand, the utility model provides a range hood, including the oil fume filtering device of any of the above-mentioned schemes, the shell is a smoke exhaust duct, the range hood also includes a smoke hood, a main box and a fan, the smoke hood is connected to the main box, the main box is connected to the smoke exhaust duct, and the fan is arranged in the main box.

[0022] The oil fume filtering device provided by the utility model has at least the following beneficial effects:

[0023] The oil fume filtering device comprises a housing, a fan and a motor. The housing has a fume passage for conveying oil fume; the fan is mounted on the housing, and the fan is located in the fume passage, and the fan comprises a plurality of blades, and the blades are provided with a plurality of filter holes; the motor is mounted on the housing, and the motor is connected to the fan by transmission. In the oil fume filtering device, on the one hand, the oil fume will collide with the blades, and the blades can block the large solid particles and oil droplets in the oil fume, while the light clean gas can pass through the blades smoothly through the filter holes, thereby playing a filtering effect and reducing wind resistance; on the other hand, the blades can also drive the oil fume to rotate, and under the action of centrifugal force, the large solid particles and oil droplets in the oil fume can be thrown toward the housing to enhance the filtering effect on the oil fume; on the other hand, the rotation of the blades is equivalent to increasing the contact area between the blades and the oil fume per unit time, which can further enhance the filtering effect on the oil fume.

[0024] The range hood provided by the utility model has at least the following beneficial effects:

[0025] The range hood includes the above-mentioned oil fume filtering device, the shell is a smoke exhaust duct, the range hood also includes a smoke hood, a main box and a fan, the smoke hood is connected to the main box, the main box is connected to the smoke exhaust duct, and the fan is arranged in the main box. Since the oil fume filtering device has a strong filtering performance, it can prevent grease and harmful chemicals in the oil fume from being discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the oil fume filtering device in the embodiment of the utility model;

[0027] Figure 2 This is a cross-sectional view of the oil fume filtering device in the embodiment of the utility model;

[0028] Figure 3 This is an exploded view of the oil fume filtering device in the embodiment of the utility model. Figure 1 ;

[0029] Figure 4 This is an exploded view of the oil fume filtering device in the embodiment of the utility model. Figure 2 ;

[0030] Figure 5 This is a schematic diagram of the structure of the fan in the oil fume filtering device in the embodiment of the utility model;

[0031] Figure 6 for Figure 2 Magnified view at A in the middle.

[0032] In the figure:

[0033] 1. Shell; 11. Smoke channel; 12. Avoidance hole; 13. Annular groove; 14. Oil drain hole; 15. Water mist inlet; 16. Installation port;

[0034] 2. fan; 21. drum; 211. inner cavity; 212. first opening; 213. second opening; 22. blade; 221. filter hole;

[0035] 3. Motor;

[0036] 4. Driving wheel;

[0037] 5. Bearings;

[0038] 6. Oil collecting tank;

[0039] 7. Spraying device; 71. Water tank; 711. Water outlet; 72. Atomizer; 73. Water pump; 74. First water pipe; 75. Second water pipe;

[0040] 8. Hose. DETAILED DESCRIPTION

[0041] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] The oil fume filtering device in the prior art filters the oil fume through a filter plate, which is fixed in the smoke passage. When the oil fume collides with the filter plate, it can block the passage of larger solid particles and oil droplets in the oil fume, thereby filtering the oil fume. However, this filtering method has limited ability to filter the oil fume.

[0046] In view of this, the present embodiment provides an oil fume filtering device to solve the above problem. The oil fume filtering device can be applied to a range hood and can be installed in a household kitchen or a restaurant.

[0047] For details, please refer to Figures 1 to 5The oil fume filtering device comprises a housing 1, a fan 2 and a motor 3. The housing 1 has a fume passage 11 for conveying oil fume; the fan 2 is mounted on the housing 1 and is located in the fume passage 11. The fan 2 comprises a plurality of blades 22, and the blades 22 are provided with a plurality of filter holes 221; the motor 3 is mounted on the housing 1 and is in transmission connection with the fan 2. The oil fume filtering device provided by the present embodiment drives the fan 2 to rotate by the motor 3. When the oil fume passes through the fan 2, firstly, the oil fume will collide with the blade 22, and the blade 22 can block the solid particles and oil droplets with larger mass in the oil fume, while the clean gas with lighter mass can smoothly pass through the blade 22, thus achieving a filtering effect; secondly, since the blade 22 is provided with a filter hole 221, the clean gas can pass through the blade 22 through the filter hole 221, so there is no need to detour, which can effectively reduce the wind resistance; thirdly, the blade 22 can also drive the oil fume to rotate, and the rotation can generate centrifugal force. Under the action of the centrifugal force, the solid particles and oil droplets with larger mass in the oil fume can be thrown toward the shell 1, further enhancing the filtering effect on the oil fume; fourthly, since the blade 22 rotates, it is equivalent to increasing the contact area between the blade 22 and the oil fume per unit time, which can further enhance the filtering effect on the oil fume. Through the above four aspects, the filtering performance of the oil fume filtering device can be significantly improved.

[0048] In actual use, the speed of the corresponding fan 2 can be matched according to the concentration of the oil smoke. Relatively speaking, the greater the concentration of the oil smoke, the higher the speed of the matched fan 2, and the better the filtering effect of the oil smoke.

[0049] The fan 2 may be a shaft fan or a shaftless fan. In this embodiment, the fan 2 is a shaftless fan as an example for explanation. Figures 2 to 6 The fan 2 further includes a drum 21, which is located in the smoke passage 11, the drum 21 is rotatably connected to the housing 1, and the motor 3 is transmission-connected to the drum 21; the drum 21 has an inner cavity 211, one end of the inner cavity 211 is provided with a first opening 212, the other end of the inner cavity 211 is provided with a second opening 213, and the first opening 212 is communicated with the smoke passage 11, the second opening 213 is communicated with the smoke passage 11, and a plurality of blades 22 are arranged on the cavity wall of the inner cavity 211 at intervals along the circumferential direction of the drum 21. The motor 3 drives the drum 21 to rotate, thereby driving each blade 22 to rotate synchronously, without the need to set a rotating shaft, so that there is a larger installation space to arrange the blades 22, thereby increasing the size of the blades 22 along the radial direction of the fan 2, that is, increasing the filtering area of ​​the blades 22, so as to further improve the filtering effect. Specifically, in this embodiment, a plurality of blades 22 are evenly and spacedly arranged on the wall of the inner cavity 211 along the circumferential direction of the drum 21, and the first opening 212 is located upstream of the second opening 213 along the direction in which the smoke is transported through the smoke channel 11. Figure 2As shown by arrows ab in .

[0050] In this embodiment, the end surface of the blade 22 is streamlined. In this way, on the one hand, the streamlined shape makes the rotation resistance of the blade 22 smaller, which can reduce noise; on the other hand, it is also easier to drive the passing oil smoke to rotate, and under the action of centrifugal force, the solid particles and oil droplets with larger mass in the oil smoke are thrown to the inner surface of the drum 21. Specifically, in this embodiment, the blade 22 is roughly triangular, and one side of the blade 22 is connected to the inner circumference of the drum 21, and the intersection line of the two is arc-shaped.

[0051] In addition, the present embodiment does not limit the shape of the filter hole 221, and the filter hole 221 can be set to a circular hole, a square hole, a hexagonal hole, etc. as needed.

[0052] It can be understood that when the fan 2 rotates, the fan 2 can also drive the air on one side thereof to flow to the other side. Specifically, in this embodiment, the motor 3 can rotate forward or reverse. When the motor 3 rotates forward, the direction of the airflow driven by the fan 2 is the same as the direction in which the smoke duct 11 conveys the oil smoke, that is, Figure 2 When the motor 3 is reversed, the direction of the airflow driven by the fan 2 is opposite to the direction of the fume conveyed by the fume channel 11. Figure 2 The direction indicated by the arrow in cd.

[0053] In a specific cooking process, in cooking modes such as stir-frying, the concentration of oil smoke will be higher, and in cooking modes such as steaming, the concentration of oil smoke will be lower. Different oil smoke concentrations have different loads on the fan 2 to filter the oil smoke. When the concentration of oil smoke is higher, the load of the fan 2 to filter the oil smoke is also relatively high. At this time, if the speed of the oil smoke passing through the fan 2 can be reduced, the time for the oil smoke to pass through the fan 2 can be extended, thereby improving the filtering effect of the oil smoke. Therefore, in this case, the motor 3 can be reversed, and the fan 2 provides resistance to slow down the oil smoke flowing through the fan 2, thereby extending the time for the oil smoke to pass through the fan 2 and improving the filtering effect of the oil smoke. When the concentration of oil smoke is lower, the load of the fan 2 to filter the oil smoke is also relatively low. At this time, if the oil smoke can pass through the fan 2 at a higher speed, the suction capacity of the oil smoke can be improved. Therefore, in this case, the motor 3 can be rotated forward, and the oil smoke flowing through the fan 2 can be accelerated under the action of the suction provided by the fan 2, so as to achieve the effect of improving the discharge capacity of the oil smoke.

[0054] It should be noted that when the motor 3 is reversed, the speed of the motor 3 needs to be constrained to a certain extent. Specifically, a higher speed can be appropriately selected without affecting the emission of oil smoke.

[0055] Please refer to Figure 4 and Figure 6 In this embodiment, the housing 1 is provided with an avoidance hole 12, which is connected to the smoke channel 11, and the motor 3 is located outside the smoke channel 11; the oil fume filtering device also includes a driving wheel 4, the output shaft of the motor 3 is connected to the driving wheel 4 by transmission, and the driving wheel 4 passes through the avoidance hole 12 and is connected to the drum 21 by transmission. In this way, the motor 3 can be arranged outside the housing 1 to avoid occupying the space in the smoke channel 11. Among them, the driving wheel 4 can be directly installed on the output shaft of the motor 3, or a reduction mechanism can be arranged between the driving wheel 4 and the motor 3. The driving wheel 4 can be a friction wheel, in which case the outer peripheral surface of the driving wheel 4 is in contact with the drum 21, and the friction force drives the drum 21 to rotate; the driving wheel 4 can also be set as a gear, in which case a gear ring is fixedly sleeved on the drum 21, the gear and the gear ring are meshed, and the gear drives the drum 21 to rotate synchronously through the gear ring.

[0056] Please continue to refer to Figure 6 In this embodiment, an annular groove 13 is provided on the inner wall of the smoke channel 11, and the drum 21 is rotatably arranged in the annular groove 13. In this arrangement, under the action of the centrifugal force provided by the fan 2, the oil on the blades 22 will gradually accumulate on the inner wall of the drum 21, and after accumulating to a certain amount, it can flow out of the drum 21 through the first opening 212 and the second opening 213 of the drum 21, and then will be thrown to the bottom surface of the annular groove 13 under the action of the centrifugal force, and the oil droplets on the bottom surface of the annular groove 13 will gradually accumulate at the bottom of the annular groove 13 under the action of their own gravity, so that the oil can be collected through the annular groove 13.

[0057] Please continue to refer to Figure 3 , Figure 4 and Figure 6 In this embodiment, the oil fume filtering device further includes a bearing 5, which is disposed between the drum 21 and the bottom surface of the annular groove 13, and the outer circumference of the drum 21 is spaced from the bottom surface of the annular groove 13. By providing the bearing 5, on the one hand, the drum 21 can rotate more smoothly relative to the housing 1 to reduce the load of the motor 3; on the other hand, under the support of the bearing 5, a gap can be provided between the drum 21 and the bottom surface of the annular groove 13 to prevent the drum 21 from contacting the oil accumulated at the bottom of the annular groove 13, thereby preventing the drum 21 from taking away the oil accumulated at the bottom of the annular groove 13 during rotation. In other embodiments, the outer circumference of the drum can also be rotated and fitted with the bottom surface of the annular groove as required.

[0058] In this embodiment, the bearing 5 can be a steel ball bearing, because the outer diameter of the roller 21 is relatively large, and the steel ball bearing can reduce the weight. The housing 1 can be made of stainless steel to enhance the support strength. Of course, in other embodiments, the type of the bearing and the material of the housing can also be selected according to needs.

[0059] Please refer to Figure 3 and Figure 4 In this embodiment, two bearings 5 ​​are specifically provided, and the two bearings 5 ​​are spaced apart along the axial direction of the drum 21, which can ensure that the drum 21 can rotate smoothly relative to the housing 1. In other embodiments, the number of bearings can also be set to one or three or more as needed.

[0060] Please continue to refer to Figure 6 In this embodiment, the housing 1 is further provided with an oil drain hole 14, which is connected to the bottom of the annular groove 13. The oil fume filtering device further includes an oil collecting groove 6, which is fixed below the housing 1 and connected to the oil drain hole 14. The oil accumulated in the annular groove 13 can flow into the oil collecting groove 6 and be collected by the oil collecting groove 6, thereby reducing the fire hazard in the smoke passage 11. The oil collecting groove 6 can be directly connected to the oil drain hole 14 or indirectly connected. In this embodiment, an example is given in which the oil collecting groove 6 is indirectly connected to the oil drain hole 14 through a hose 8.

[0061] Please refer to Figures 2 to 4 In this embodiment, the oil fume filtering device further includes a spray device 7, which is arranged upstream of the fan 2 in the direction of the oil fume conveying along the smoke passage 11, and is used to spray water mist into the smoke passage 11. The water mist sprayed by the spray device 7 can contact with relatively small oil droplets in the smoke passage 11. When the small oil droplets absorb water to increase their mass, they can combine to produce large oil droplets, and gravity is used to separate the heavy large oil droplets from the light clean gas, so that the purification effect of the oil fume can be further enhanced and the filtering load of the fan 2 can be reduced.

[0062] Please continue to refer to Figures 2 to 4 In this embodiment, the spray device 7 includes a water tank 71 and an atomizer 72. The water tank 71 is arranged above the shell 1, and the water tank 71 is provided with a water outlet 711. The shell 1 is also provided with a water mist inlet 15. The water mist inlet 15 is connected with the water outlet 711, and the water mist inlet 15 is connected with the smoke channel 11. The atomizer 72 is arranged at the water mist inlet 15. The water in the water tank 71 enters the water mist inlet 15 through the water outlet 711, and forms water mist under the action of the atomizer 72 and enters the smoke channel 11.

[0063] Also, please refer to Figure 4 The housing 1 is provided with a mounting port 16, which is connected to the flue gas passage 11 and the oil collecting tank 6. It is understandable that as the water mist continuously enters the flue gas passage 11, the water mist will accumulate in the flue gas passage 11 and form water. Thus, on the one hand, the oil droplets formed by spraying can enter the oil collecting tank 6 through the mounting port 16 and be collected by the oil collecting tank 6; on the other hand, water can also enter the oil collecting tank 6 through the mounting port 16 and be collected by the oil collecting tank 6. Among them, please refer to Figure 2, Figure 4 and Figure 6 The oil collecting tank 6 is arranged directly below the mounting opening 16 .

[0064] Please refer to Figure 1 and Figure 2 In this embodiment, the spray device 7 also includes a water pump 73, a first water pipe 74 and a second water pipe 75. The water pump 73 is installed on the water tank 71. The pump inlet of the water pump 73 is connected to the oil collecting tank 6 through the first water pipe 74, and the pump outlet of the water pump 73 is connected to the water tank 71 through the second water pipe 75. In this way, the water in the oil collecting tank 6 can be transported to the water tank 71 through the water pump 73 to realize water circulation.

[0065] The present embodiment also provides a range hood, which includes the above-mentioned oil fume filtering device, the shell 1 is specifically a smoke exhaust duct, the range hood also includes a smoke hood (not shown in the drawings), a main box (not shown in the drawings) and a fan (not shown in the drawings), the smoke hood is connected to the main box, the main box is connected to the smoke exhaust duct, the fan is arranged in the main box, and under the drive of the fan, the oil fume passes through the smoke hood and the main box in turn into the smoke exhaust duct, and can then be effectively filtered by the oil fume filtering device to prevent the discharge of grease and harmful chemicals in the oil fume.

[0066] In other embodiments, the shell may be a smoke hood of a range hood or a main box of the range hood.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fume filtering device, characterized in that: include: A housing (1), wherein the housing (1) has a fume passage (11) for conveying oil fume; a fan (2), the fan (2) being mounted on the housing (1), the fan (2) being located in the smoke passage (11), the fan (2) comprising a plurality of blades (22), the blades (22) being provided with a plurality of filter holes (221); and A motor (3), wherein the motor (3) is mounted on the housing (1), and the motor (3) is drivingly connected to the fan (2).

2. The oil fume filtering device according to claim 1, characterized in that: The fan (2) further comprises a drum (21), wherein the drum (21) is located in the smoke passage (11), the drum (21) is rotationally connected to the housing (1), and the motor (3) is transmission-connected to the drum (21); The drum (21) comprises an inner cavity (211), one end of the inner cavity (211) is provided with a first opening (212), the other end of the inner cavity (211) is provided with a second opening (213), the first opening (212) is communicated with the smoke passage (11), the second opening (213) is communicated with the smoke passage (11), and a plurality of blades (22) are arranged on the cavity wall of the inner cavity (211) at intervals along the circumferential direction of the drum (21).

3. The oil fume filtering device according to claim 2, characterized in that: The housing (1) is provided with a position avoidance hole (12), the position avoidance hole (12) is communicated with the smoke passage (11), and the motor (3) is located outside the smoke passage (11); The oil fume filtering device also includes a driving wheel (4), the output shaft of the motor (3) is drivingly connected to the driving wheel (4), and the driving wheel (4) passes through the avoidance hole (12) and is drivingly connected to the drum (21).

4. The oil fume filtering device according to claim 2, characterized in that: The inner wall of the smoke channel (11) is provided with an annular groove (13), and the roller (21) is rotatably arranged in the annular groove (13).

5. The oil fume filtering device according to claim 4, characterized in that: The oil fume filtering device further comprises a bearing (5), wherein the bearing (5) is arranged between the roller (21) and the bottom surface of the annular groove (13), and the outer peripheral surface of the roller (21) is spaced apart from the bottom surface of the annular groove (13).

6. The oil fume filtering device according to claim 4, characterized in that: The housing (1) is also provided with an oil drain hole (14), and the oil drain hole (14) is communicated with the bottom of the annular groove (13); The oil fume filtering device further comprises an oil collecting groove (6), wherein the oil collecting groove (6) is fixed below the housing (1), and the oil collecting groove (6) is communicated with the oil drain hole (14).

7. The oil fume filtering device according to claim 1, characterized in that: The oil fume filtering device further comprises a spray device (7), which is arranged upstream of the fan (2) in the direction in which the oil fume is transported along the smoke channel (11), and is used to spray water mist into the smoke channel (11).

8. The oil fume filtering device according to claim 1, characterized in that: The motor (3) rotates forward, and the direction in which the fan (2) drives the airflow to flow is the same as the direction in which the smoke passage (11) conveys the oil smoke; or The motor (3) rotates in the reverse direction, and the fan (2) drives the airflow to flow in a direction opposite to the direction in which the smoke passage (11) conveys the oil smoke.

9. The oil fume filtering device according to any one of claims 1 to 8, characterized in that: The end surface of the blade (22) is streamlined.

10. A range hood, characterized in that: It comprises the oil fume filtering device according to any one of claims 1 to 9, the shell (1) is a smoke exhaust duct, the range hood further comprises a smoke hood, a main box and a fan, the smoke hood is connected to the main box, the main box is connected to the smoke exhaust duct, and the fan is arranged in the main box.

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