An oil fume extractor with efficient cyclic oil filtering

Abstract

The present invention discloses an oil fume extractor with efficient cyclic oil fume filtration, belonging to the technical field of oil fume extractors. At present, the oil fume extractor separates oil fume through a filter screen, and there is a problem of poor oil fume separation effect. The present invention includes a fan group and an oil fume inhalation and filtration box. The oil fume inhalation and filtration box includes an oil fume extractor box body, a filtration component, a flow disturbance and oil separation component, and an oil collection box; the oil fume extractor box body is sequentially provided with a connected cylindrical groove, a bucket-shaped groove, a first frustum-shaped groove, and a second frustum-shaped groove from bottom to top; the oil collection box is installed in the cylindrical groove; the filtration component is installed in the bucket-shaped groove, and the filtration component includes a filter element, and the frustum-shaped cylindrical surface of the filter element fits with the wall surface of the bucket-shaped groove; a flow disturbance and oil separation component for further colliding and separating oil droplet particles in the flue gas is installed in the first frustum-shaped groove and the second frustum-shaped groove; a pipeline rotating component is installed at the top of the oil fume extractor box body. This technical solution realizes efficient multiple oil fume separation of oil fume, increases the oil fume separation efficiency, and improves the flexibility of the use of the oil fume extractor at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and particularly relates to a range hood with efficient circulating oil pollution filtration. Background Art

[0002] Range hoods have been in China for nearly 20 years. Starting from the initial top-suction thin range hood, it has developed to the side-suction deep range hood. To increase the oil fume adsorption coverage area, the side-suction range hood increases the power of the fan unit, resulting in a large power consumption for oil fume absorption. Later, it evolved to the situation mainly dominated by top-suction and European-style range hoods. The early thin range hoods had a compact structure and low price, but had defects such as small suction, high noise, and easy oil leakage.

[0003] After continuous development and iteration, the top-suction range hood generally adopts a bottom-protruding mounting mesh cover, a filter screen is installed above the mesh cover, and an oil box is installed at the lower point below the mesh cover. This structural design mainly separates oil fume through the filter screen, resulting in poor oil fume separation effect. At the same time, during the use process, the condensed oil droplets on the filter screen further affect the efficiency of oil fume separation.

[0004] Based on the above problems, the present invention proposes a range hood with efficient circulating oil pollution filtration. Summary of the Invention

[0005] Aiming at the problems in the above technical background, the purpose of the present invention is to provide a range hood with efficient circulating oil pollution filtration. On the one hand, by setting a frustum-shaped filter element with an inwardly concave bottom surface, it is convenient for the condensed oil droplets to slide away along the bucket-shaped groove, reducing the influence of the condensed oil droplets on the filtration effect. On the other hand, a flow-disturbing oil-separating component is installed in the range hood casing above the filter element, and the oil droplet particles in the flue gas are further separated by disturbing and colliding the airflow, solving the problem of poor oil fume separation effect of the existing top-suction range hood in the background technology. At the same time, through a unique flow groove design, the collection of the separated oil droplets is accelerated, facilitating the cleaning after the oil pollution is collected.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A range hood with efficient circulating oil pollution filtration includes a fan unit and an oil fume inhalation and filtration box. The oil fume inhalation and filtration box includes a range hood casing, a filtration component, a flow-disturbing oil-separating component, and a detachable annular oil collection box;

[0008] The range hood casing is successively provided with a communicating cylindrical groove, a bucket-shaped groove, a first frustum-shaped groove, and a second frustum-shaped groove from bottom to top;

[0009] The detachable annular oil collection box is installed in the cylindrical groove;

[0010] A filtering component for separating and filtering oil fumes is installed in the hopper-shaped groove, and the frustum-shaped cylindrical surface of the filter element fits against the wall surface of the hopper-shaped groove;

[0011] The larger ends of the first frustum-shaped groove and the second frustum-shaped groove face each other, and a flow-disturbing oil-separating component for further colliding and separating oil droplet particles in the flue gas is installed in the first frustum-shaped groove and the second frustum-shaped groove;

[0012] A pipeline rotating component for adjusting the oil fume suction angle is installed at the top of the range hood box body.

[0013] Further, a plurality of uniformly arranged flow-guiding grooves are communicated on the hopper-shaped surface of the hopper-shaped groove in the range hood box body. Both ends of the flow-guiding groove are communicated with the cylindrical groove and the first frustum-shaped groove. An oil collecting box is installed on the cylindrical groove, and the filtering component is installed above the hopper-shaped groove.

[0014] Furthermore, the oil collecting box includes a bottom plate, an outer ring and an inner ring. The outer ring and the inner ring are concentrically installed above the bottom plate. First clamping blocks are symmetrically installed on the bottom plate, and first clamping grooves are symmetrically arranged on the outer side of the bottom of the range hood box body. The first clamping blocks are inserted into the first clamping grooves.

[0015] Furthermore, the outer diameter of the outer ring is equal to the diameter of the cylindrical groove, and the outer diameter of the inner ring is smaller than the circumferential diameter of the bottom surface of the hopper-shaped groove.

[0016] Furthermore, the filtering component includes a filter element in the shape of a frustum with a concave surface at the bottom, and a plurality of inserted teeth. A plurality of groups of the inserted teeth are uniformly installed on the frustum-shaped surface of the filter element. The inserted teeth are provided with oil seepage channels penetrating through the upper and lower ends. The inserted teeth are inserted into the flow-guiding grooves, and the bottom of the filter element is installed above the hopper-shaped groove through a connected positioning block.

[0017] Furthermore, the flow-disturbing oil-separating component includes a plurality of bent flow-disturbing plates and a flow-disturbing block in the shape of a frustum with a groove at the bottom. A plurality of groups of flow-disturbing plates are annularly installed on the inner surface of the range hood box body corresponding to the first frustum-shaped groove and the second frustum-shaped groove. The larger end of the circumference of the flow-disturbing block is placed below. At the same time, a plurality of flow-discharging grooves for changing the flow direction of the flue gas and colliding and separating oil droplet particles are uniformly arranged on the ring at the bottom opening of the flow-disturbing block. The flue gas passing through the flow-discharging grooves enters the air flow channel between the flow-disturbing block and the first frustum-shaped groove and the second frustum-shaped groove and collides with a plurality of groups of flow-disturbing plates to separate oil droplet particles. A plurality of second clamping blocks are installed above the flow-disturbing plates, and the second clamping blocks are clamped in the second clamping grooves provided at the top of the range hood box body.

[0018] Further, the pipeline rotating component is installed on the range hood box body at the top end of the second frustum-shaped groove.

[0019] Furthermore, the pipeline rotation assembly includes a first air duct with an arc-shaped top surface, an arc-shaped plate, a second air duct, two sets of clamping plates, and a servo motor. The bottom end of the first air duct is installed on the range hood box body. A first air outlet is provided on the arc-shaped surface at the top of the first air duct. The arc-shaped plate is installed at the bottom end of the second air duct. A second air outlet is penetrated through the arc-shaped plate. The arc-shaped surface at the top of the first air duct is fitted and installed with the arc-shaped plate. The two sides of the arc-shaped plate are symmetrically installed with the clamping plates to install the top of the first air duct. One of the clamping plates is installed with the servo motor. The output end of the servo motor penetrates through the clamping plate and is installed on one side of the top of the first air duct and is concentric with the arc-shaped surface.

[0020] Furthermore, the other end of the second air duct is connected with the fan group, and is installed above the integrated stove through the fan group at the same time.

[0021] Further, a control panel for easy manual operation is installed on the circumferential surface of one side of the range hood box body.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) In the present invention, a column-shaped groove, a bucket-shaped groove, a first frustum-shaped groove, and a second frustum-shaped groove are successively provided from bottom to top in the range hood box body. A detachable annular oil collecting box is installed in the column-shaped groove. A filtering component for separating and filtering oil fume is installed in the bucket-shaped groove. The larger ends of the first frustum-shaped groove and the second frustum-shaped groove face each other. At the same time, a turbulent flow oil separation component for further colliding and separating oil droplet particles in the flue gas is installed in the first frustum-shaped groove and the second frustum-shaped groove. After the oil fume is separated by the filtering component, it flows through the surface of the bucket-shaped groove to the oil collecting box at the bottom. At the same time, the filtered flue gas passes through the turbulent flow oil separation component above to further separate the fine oil droplet particles in the flue gas, thereby improving the oil fume separation efficiency.

[0024] (2) In the present invention, a pipeline rotation assembly for adjusting the oil fume suction angle is installed on the top of the range hood box body. The first air duct is driven to rotate by the servo motor, and the first air duct drives the range hood box body to rotate. During the rotation of the first air duct, the first air outlet at the top end and the second air outlet on the arc-shaped plate are always in a communicating state, thereby realizing the fine adjustment of the angle of the oil fume suction port of the range hood and improving the flexibility of the range hood in use. Description of the Drawings

[0025] Figure 1 is a three-dimensional view provided by an embodiment of the present invention Figure 1 ;

[0026] Figure 2 is a three-dimensional view provided by an embodiment of the present invention Figure 2 ;

[0027] Figure 3 Exploded perspective view of the oil collecting box provided by the embodiment of the present invention;

[0028] Figure 4 Perspective view of removing the oil collecting box provided by the embodiment of the present invention;

[0029] Figure 5 Perspective view of the filter assembly provided by the embodiment of the present invention;

[0030] Figure 6 Perspective view of removing the filter assembly provided by the embodiment of the present invention;

[0031] Figure 7 Half-section perspective view of removing the filter assembly provided by the embodiment of the present invention;

[0032] Figure 8 Half-section perspective view of removing the filter assembly and the flow-disturbing oil-separating assembly provided by the embodiment of the present invention;

[0033] Figure 9 Partial perspective view of the flow-disturbing oil-separating assembly provided by the embodiment of the present invention;

[0034] Figure 10 Exploded perspective view of the pipeline rotating assembly provided by the embodiment of the present invention;

[0035] Figure 11 Partial perspective view of the pipeline rotating assembly provided by the embodiment of the present invention.

[0036] In the figure: 1, the range hood box body; 2, the control panel; 3, the first card slot; 4, the first air duct; 5, the first air outlet; 6, the arc-shaped plate; 7, the second air outlet; 8, the second air duct; 9, the clamping plate; 10, the servo motor; 11, the cylindrical groove; 12, the bottom plate; 13, the first clamping block; 14, the outer ring; 15, the inner ring; 16, the funnel-shaped groove; 17, the guide chute; 18, the filter element; 19, the inserted teeth; 20, the oil seepage channel; 21, the positioning block; 22, the first frustum-shaped groove; 2201, the second frustum-shaped groove; 23, the flow-disturbing plate; 24, the second card slot; 25, the flow-disturbing block; 26, the second clamping block; 27, the oil discharge groove. Detailed Description of the Invention

[0037] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present invention, and are not intended to limit the present invention.

[0038] As shown in Figures 1-11As shown in the figure, an oil fume extractor with efficient cyclic oil pollution filtration includes a blower unit and an oil fume suction and filtration box. The oil fume suction and filtration box includes an oil fume extractor body 1, a filtration component, a flow disturbance and oil separation component, and a detachable annular oil collection box. The filtration component can adopt a filter screen. The oil fume extractor body 1 is successively provided with a connected cylindrical groove 11, a funnel-shaped groove 16, a first frustum-shaped groove 22, and a second frustum-shaped groove 2201 from bottom to top. The diameter of the cylindrical groove 11 is greater than the circumferential diameter of the bottom surface of the funnel-shaped groove 16 to ensure that the collected oil can enter the oil collection box. A detachable annular oil collection box is installed in the cylindrical groove 11. A filtration component for separating and filtering oil fume is installed in the funnel-shaped groove 16. The filtration component includes a filter element 18 in the shape of a frustum with a concave surface at the bottom. The frustum cylindrical surface of the filter element 18 fits against the wall surface of the funnel-shaped groove 16. The larger ends of the first frustum-shaped groove 22 and the second frustum-shaped groove 2201 face each other. At the same time, a flow disturbance and oil separation component for further colliding and separating oil droplet particles in the flue gas is installed in the first frustum-shaped groove 22 and the second frustum-shaped groove 2201. A pipeline rotation component for adjusting the oil fume suction angle is installed at the top of the oil fume extractor body 1. The design idea is to set a frustum-shaped smoke suction channel to suck in the flue gas and then filter and separate the oil fume. The filtered flue gas enters the upper flow disturbance and oil separation component to further collide and separate the oil pollution particles in the flue gas. The separated oil droplets are accelerated and collected at the bottom of the funnel-shaped groove 16 into the bottom oil collection box to avoid oil droplet accumulation affecting the oil fume filtration effect.

[0039] In this embodiment, the oil fume enters the funnel-shaped groove 16 through the inner circle of the annular oil collection box, and the oil fume is separated by the filtration component installed above the funnel-shaped groove 16. The separated oil droplets flow from the concave surface at the bottom of the filter element 18 through the funnel-shaped groove 16 to the bottom annular oil collection box for collection. At the same time, the filtered oil fume enters the first frustum-shaped groove 22 and the second frustum-shaped groove 2201, and collides with the flow disturbance and oil separation component installed in the first frustum-shaped groove 22 and the second frustum-shaped groove 2201 multiple times to separate fine particle oil droplets. Then the gas is pumped away by the pipeline rotation component at the top, and the oil droplets flow down and converge out along the first frustum-shaped groove 22 and the second frustum-shaped groove 2201. Through double-layer filtration, the oil fume separation efficiency is improved.

[0040] As Figure 2 , 7 As shown in the figure, a plurality of uniformly arranged guide chutes 17 are connected to the funnel-shaped surface of the funnel-shaped groove 16 inside the oil fume extractor body 1. Both ends of the guide chutes 17 are connected to the cylindrical groove 11 and the first frustum-shaped groove 22. An oil collection box is installed on the cylindrical groove 11, and a filtration component is installed above the funnel-shaped groove 16. By providing the guide chutes 17, the efficiency of collecting the separated oil droplets is increased.

[0041] As Figure 3As shown in the figure, the oil collecting box includes a bottom plate 12, an outer ring 14 and an inner ring 15. The outer ring 14 and the inner ring 15 are concentrically installed above the bottom plate 12. First clamping blocks 13 are symmetrically installed on the bottom plate 12. First clamping grooves 3 are symmetrically provided on the outer side of the bottom of the oil fume machine box body 1. The first clamping blocks 13 are inserted into the first clamping grooves 3. Oil droplets flow into the space between the outer ring 14 and the inner ring 15 through the guide chute 17 or the surface of the bucket-shaped groove 16 for collection. At the same time, the installation is facilitated by the presence of the first clamping blocks 13 for disassembly.

[0042] As Figure 3 shown, the outer diameter of the outer ring 14 is equal to the diameter of the cylindrical groove 11, and the outer diameter of the inner ring 15 is smaller than the circumferential diameter of the bottom surface of the bucket-shaped groove 16. The stability of the installation of the oil collecting box is increased through dimensional limitations. At the same time, the outer diameter of the inner ring 15 being smaller than the circumferential diameter of the bottom surface of the bucket-shaped groove 16 prevents oil droplets from leaking out of the oil collecting box.

[0043] As Figure 4 、 5 shown, the filtering assembly further includes multiple groups of inserted teeth 19. Multiple groups of inserted teeth 19 are evenly installed on the frustum surface of the filter element 18. Oil seepage channels 20 penetrating the upper and lower ends are provided on the inserted teeth 19. The inserted teeth 19 are inserted into the guide chute 17. The bottom of the filter element 18 is installed above the bucket-shaped groove 16 by connecting a positioning block 21. Oil droplets generated by the flow disturbance in the first frustum-shaped groove 22 and the second frustum-shaped groove 2201 enter the oil seepage channels 20 through the guide chute 17 and then enter the guide chute 17 and flow into the oil collecting box at the bottom. The design of the flow channels increases the smoothness of the flow. By controlling the aperture of the oil seepage channels 20, gas will not directly enter the upper part during the operation of exhausting and sucking fumes. During the non-working state, the oil droplets generated by the flow disturbance flow into the oil collecting box at the bottom through the oil seepage channels 20.

[0044] As Figures 7-9 shown, the flow disturbance and oil separation assembly includes multiple groups of bent flow disturbance plates 23 and flow disturbance blocks 25 with a frustum shape and a groove at the bottom. Multiple groups of flow disturbance plates 23 are annularly installed on the inner surface of the oil fume machine box body 1 corresponding to the first frustum-shaped groove 22 and the second frustum-shaped groove 2201. The larger end of the circumference of the flow disturbance block 25 is placed downward. At the same time, multiple groups of flow discharge grooves 27 for changing the flow direction of the smoke and colliding to precipitate oil droplet particles are evenly provided on the ring at the bottom opening of the flow disturbance block 25. The smoke passing through the flow discharge grooves 27 enters the air flow channel between the flow disturbance block 25 and the first frustum-shaped groove 22 and the second frustum-shaped groove 2201 and collides with multiple groups of flow disturbance plates 23 to precipitate oil droplet particles. Multiple groups of second clamping blocks 26 are installed above the flow disturbance plates 23. The second clamping blocks 26 are clamped in the second clamping grooves 24 provided at the top of the oil fume machine box body 1. The smoke filtered by the filter element 18 enters the bottom of the flow disturbance block 25, impacts the bottom of the flow disturbance block 25 and then enters the air flow channel between the flow disturbance block 25 and the first frustum-shaped groove 22 and the second frustum-shaped groove 2201 through the flow discharge grooves 27 and collides with multiple groups of flow disturbance plates 23 to precipitate oil droplet particles. Thus, double flow disturbance and affinity adsorption of fine oil droplet particles in the smoke are achieved, further improving the efficiency of oil fume separation.

[0045] As Figure 1 、 2 As shown in FIGS. 8, etc., a duct rotating assembly is installed on the range hood body 1 at the top of the second frustum-shaped groove 2201. The angle of the suction port of the range hood can be finely adjusted through the duct rotating assembly, improving the flexibility of the range hood in use.

[0046] As Figure 10 、 11 As shown, the duct rotating assembly includes a first air duct 4 with an arc-shaped top surface, an arc-shaped plate 6, a second air duct 8, two sets of clamping plates 9, and a servo motor 10. The bottom end of the first air duct 4 is installed on the range hood body 1. A first air outlet 5 is provided on the arc-shaped surface at the top of the first air duct 4. The bottom end of the second air duct 8 is installed with an arc-shaped plate 6. A second air outlet 7 is provided through the arc-shaped plate 6. The arc-shaped surface at the top of the first air duct 4 is fitted and installed with the arc-shaped plate 6. The first air duct 4 is installed on both sides of the arc-shaped plate 6 by symmetrically installing clamping plates 9. A servo motor 10 is installed on one of the sets of clamping plates 9. The output end of the servo motor 10 passes through the clamping plate 9 and is installed on one side of the top of the first air duct 4 and is concentric with the arc-shaped surface. The servo motor 10 is connected to the control panel 2 through the control module. The operator can control the rotation of the servo motor 10 by controlling the control panel 2. The servo motor 10 drives the first air duct 4 to rotate and finely adjust around the arc center at the top. During the rotation, the first air outlet 5 and the second air outlet 7 are always connected to ensure the smoothness of the exhaust air. At the same time, by setting the clamping plates 9 and the arc-shaped plate 6, the installation between the first air duct 4 and the second air duct 8 is stable and in close contact, avoiding the occurrence of gas leakage and ensuring the airtightness of the exhaust.

[0047] The other end of the second air duct 8 is connected to a fan group, and at the same time, it is installed above the integrated stove through the fan group. By controlling the operation of the fan group, the effect of exhausting the smoke below is achieved.

[0048] As Figure 1 As shown, a control panel 2 for easy manual operation is installed on the circumferential surface of one side of the range hood body 1. It is convenient to control the range hood through the control panel 2, adding the function of intelligent control.

[0049] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil fume extractor with efficient cyclic oil pollution filtration, comprising a fan group and an oil fume inhalation and filtration box, characterized in that: The oil fume inhalation and filtration box includes an oil fume machine box body (1), a filtration component, a flow disturbance and oil separation component, and a detachable annular oil collection box; The oil fume machine box body (1) is successively provided with a connected cylindrical groove (11), a funnel-shaped groove (16), a first frustum-shaped groove (22), and a second frustum-shaped groove (2201) from bottom to top; A detachable annular oil collection box is installed in the cylindrical groove (11); A filtration component for separating and filtering oil fume is installed in the funnel-shaped groove (16). The filtration component includes a filter element (18) in the shape of a frustum with a concave surface at the bottom. The frustum cylindrical surface of the filter element (18) fits against the wall surface of the funnel-shaped groove (16); The larger ends of the first frustum-shaped groove (22) and the second frustum-shaped groove (2201) face each other. At the same time, the flow disturbance and oil separation component for further colliding and separating oil droplet particles in the flue gas are installed in the first frustum-shaped groove (22) and the second frustum-shaped groove (2201); A pipeline rotation component for adjusting the oil fume suction angle is installed at the top of the oil fume machine box body (1); The flow disturbance and oil separation component includes multiple groups of bent flow disturbance plates (23) and a flow disturbance block (25) in the shape of a frustum with a groove at the bottom. Multiple groups of flow disturbance plates (23) are annularly installed on the inner surface of the oil fume machine box body (1) corresponding to the first frustum-shaped groove (22) and the second frustum-shaped groove (2201). The larger end of the circumference of the flow disturbance block (25) is placed below. At the same time, multiple groups of flow discharge grooves (27) for changing the flow direction of the flue gas and colliding and separating oil droplet particles are evenly arranged on the ring with an open bottom of the flow disturbance block (25). The flue gas passing through the flow discharge grooves (27) enters the air flow channel between the flow disturbance block (25) and the first frustum-shaped groove (22) and the second frustum-shaped groove (2201) and collides with multiple groups of flow disturbance plates (23) to separate oil droplet particles. Multiple groups of second clamping blocks (26) are installed above the flow disturbance plates (23), and the second clamping blocks (26) are clamped in the second clamping grooves (24) provided at the top of the oil fume machine box body (1).

2. The range hood with efficient cyclic oil stain filtration according to claim 1, wherein, Multiple groups of guide chutes (17) evenly arranged in the oil fume machine box body (1) are communicated with the funnel-shaped surface of the funnel-shaped groove (16). The two ends of the guide chutes (17) are communicated with the cylindrical groove (11) and the first frustum-shaped groove (22). The oil collection box is installed on the cylindrical groove (11), and the filtration component is installed above the funnel-shaped groove (16).

3. The range hood with efficient cyclic oil stain filtration according to claim 2, characterized in that The oil collection box includes a bottom plate (12), an outer ring (14), and an inner ring (15). The outer ring (14) and the inner ring (15) are concentrically installed above the bottom plate (12). First clamping blocks (13) are symmetrically installed on the bottom plate (12). First clamping grooves (3) are symmetrically provided on the outer side of the bottom of the oil fume machine box body (1), and the first clamping blocks (13) are inserted into the first clamping grooves (3).

4. The range hood with efficient cyclic oil stain filtration according to claim 3, characterized in that, The outer diameter of the outer ring (14) is equal to the diameter of the cylindrical groove (11), and the outer diameter of the inner ring (15) is smaller than the circumferential diameter of the bottom surface of the funnel-shaped groove (16).

5. The range hood with efficient cyclic oil stain filtration according to claim 2, characterized in that, The filtering component further includes multiple groups of pin teeth (19). Multiple groups of the pin teeth (19) are evenly installed on the frustum surface of the filter element (18). An oil seepage channel (20) penetrating through the upper and lower ends is provided on the pin teeth (19). The pin teeth (19) are inserted into the guiding chute (17). The bottom of the filter element (18) is installed above the bucket-shaped groove (16) by connecting a positioning block (21).

6. The range hood with efficient cyclic oil stain filtration according to claim 1, wherein, The pipeline rotating component is installed on the range hood box body (1) at the top end of the second frustum-shaped groove (2201).

7. The range hood with efficient cyclic oil stain filtration according to claim 6, characterized in that, The pipeline rotating component includes a first air duct (4) with an arc-shaped top surface, an arc-shaped plate (6), a second air duct (8), two groups of clamping plates (9), and a servo motor (10). The bottom end of the first air duct (4) is installed on the range hood box body (1). A first air outlet (5) is arranged on the arc-shaped surface at the top of the first air duct (4). The bottom end of the second air duct (8) is installed with the arc-shaped plate (6). A second air outlet (7) is penetrated through the arc-shaped plate (6). The arc-shaped surface at the top of the first air duct (4) is fitted and installed with the arc-shaped plate (6). The two sides of the arc-shaped plate (6) install the top of the first air duct (4) by symmetrically installing the clamping plates (9). The servo motor (10) is installed on one of the clamping plates (9). The output end of the servo motor (10) penetrates through the clamping plate (9) and is installed on one side of the top of the first air duct (4) and is concentric with the arc-shaped surface.

8. The range hood with efficient cyclic oil pollution filtration according to claim 7, characterized in that, The other end of the second air duct (8) is connected to the blower group and is installed above the integrated stove through the blower group.

9. The range hood with efficient cyclic oil stain filtration according to claim 1, characterized in that, An operation panel (2) convenient for manual operation is installed on the circumferential surface of one side of the range hood box body (1).

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