CN212362142U - Smoke exhaust ventilator - Google Patents

Abstract

The utility model relates to a range hood, which comprises a casing, a fan and a first oil filtering mechanism, wherein an air duct with an air inlet and an air outlet at two ends is arranged in the casing; the range hood further comprises a second oil filtering mechanism, the second oil filtering mechanism is arranged between the air outlet of the shell and the outside, and the second oil filtering mechanism is located on a path through which the oil smoke circulates from the air outlet of the shell to the outside. According to the range hood, the oil smoke is discharged from the air outlet of the shell after being filtered by the first oil filtering mechanism and is discharged to the outside after being filtered again by the second oil filtering mechanism, so that the amount of oil carried by the oil smoke discharged to the atmosphere is reduced, the atmospheric pollution is reduced, and the environment is protected.

Description

Smoke exhaust ventilator

Technical Field

The utility model relates to a fume extractor technical field especially relates to a smoke ventilator.

Background

With the progress of society and the improvement of living standard of people, the range hood is widely applied to daily life of people. The cooking fume exhauster, also known as cooking fume exhauster, is a kitchen electrical appliance for purifying kitchen environment, and is mounted over the kitchen range, and can quickly exhaust away the waste material burned by the range and the oil fume harmful to human body produced in the cooking process, discharge the oil fume to the outside, and condense and collect the oil fume so as to purify the environment, reduce pollution and have the safety guarantee function of gas defense and explosion prevention.

When the traditional range hood works, the motor is powered on to drive the wind wheel to rotate at a high speed, so that a negative pressure area is formed in a certain space range above the range hood, indoor oil smoke is sucked into the range hood, the oil smoke is subjected to first oil smoke separation through the oil net and then enters the air channel, the oil smoke is subjected to second oil smoke separation through the rotation of the wind wheel, the oil smoke in the air channel is subjected to the action of centrifugal force, oil mist is condensed into oil drops, and the oil drops are collected into the oil cup through an oil way.

However, the traditional range hood causes the oil smoke to carry more oil and fat to be directly discharged outdoors, and the oil and fat are easily combined with dust in the air to form haze when being discharged outdoors, so that great harm is brought to the environment.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a range hood capable of improving the above problem, in order to solve the problem that the conventional range hood carries much grease to be discharged outdoors, which causes great harm to the environment.

A range hood comprises a shell, a fan and a first oil filtering mechanism, wherein an air duct with an air inlet and an air outlet at two ends is arranged in the shell, the fan is used for providing power for enabling oil smoke to flow from the air inlet to the air outlet, and the first oil filtering mechanism is arranged in the air duct;

the range hood further comprises a second oil filtering mechanism, the second oil filtering mechanism is arranged between the air outlet of the shell and the outside, and the second oil filtering mechanism is located on a path through which the oil smoke flows from the air outlet of the shell to the outside.

According to the range hood, the oil smoke is discharged from the air outlet of the shell after being filtered by the first oil filtering mechanism and is discharged to the outside after being filtered again by the second oil filtering mechanism, so that the amount of oil carried by the oil smoke discharged to the atmosphere is reduced, the atmosphere pollution is reduced, and the environment is protected.

In one embodiment, the second oil filtering mechanism comprises at least one layer of oil filtering units arranged along the flow direction of the oil smoke, and each layer of oil filtering unit comprises at least one oil filtering plate;

each oil filtering plate is provided with a groove which is arranged back to the air outlet, the groove penetrates through the oil filtering plates along a first direction, and the first direction is parallel to the plane where the oil filtering plates are located and is obliquely arranged relative to the flowing direction of the oil smoke.

In one embodiment, the oil filter plate is long and extends along the first direction, the cross-sectional shape of the oil filter plate is a circular arc with an opening facing away from the air outlet, and the groove is formed on the side of the oil filter plate with the opening.

In one embodiment, each layer of the oil filtering units comprises at least two oil filtering plates arranged at intervals along the second direction;

the second direction is parallel to the plane where the oil filter plates are located and is obliquely arranged relative to the flowing direction of the oil smoke and the first direction.

In one embodiment, the second direction is perpendicular to both the flow direction of the lampblack and the first direction.

In one embodiment, the second oil filtering mechanism comprises at least two layers of oil filtering units, and every two adjacent layers of oil filtering units are arranged at intervals.

In one embodiment, the oil filter plates included in each two adjacent layers of the oil filter units are arranged opposite to each other in the flow direction of the oil smoke.

In one embodiment, the oil filter plates included in each two adjacent layers of the oil filter units are arranged in a staggered manner in the flow direction of the oil smoke.

In one embodiment, the extending direction of each oil filter plate is inclined relative to the horizontal plane.

In one embodiment, the range hood further comprises a smoke exhaust pipe, and one end of the smoke exhaust pipe is communicated with the air outlet of the shell;

the second oil filtering mechanism is arranged in the smoke exhaust pipe or outside the smoke exhaust pipe.

Drawings

Fig. 1 is a schematic structural diagram of a range hood according to an embodiment of the present invention;

FIG. 2 is a partial top plan view of the range hood shown in FIG. 1;

fig. 3 is a schematic structural diagram of a second oil filtering mechanism of a range hood according to another embodiment of the present invention.

100. A range hood; 10. a housing; 11. an air outlet; 20. a second oil filtering mechanism; 21. a housing; 22. an oil filter plate; 30. a smoke exhaust pipe; 40. a first joint; 50. a second joint; 60. a third joint; 200. an external flue.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Fig. 1 shows a schematic structural diagram of a range hood according to an embodiment of the present invention; figure 2 shows a partial top view of the range hood shown in figure 1.

Referring to fig. 1, an embodiment of the present invention provides a range hood 100, and specifically, the range hood 100 may be a top-suction range hood, or may be another range hood, such as a side-suction range hood, without limitation.

The following description will explain the technical solution of the present invention in detail by taking the ceiling-mounted range hood 100 as an example. The present embodiment is merely exemplary and does not limit the technical scope of the present invention. In addition, the drawings in the embodiments also omit unnecessary components, and clearly show the technical features of the invention.

The range hood 100 includes a housing 10 and a fan, wherein an air duct is disposed in the housing 10, the air duct has an air inlet (not shown) and an air outlet 11, and the fan is configured to provide power for allowing oil smoke to flow from the air inlet to the air outlet 11, so that the oil smoke flows from the air inlet to the air outlet 11.

In one embodiment, the range hood 100 further includes a first oil filtering mechanism, and the fan and the first oil filtering mechanism are both installed in the air duct. Specifically, first oil filter mechanism assembles in the air intake department in the wind channel, and the fan is located one side that first oil filter mechanism dorsad the user, and the fan includes motor and wind wheel. When the range hood 100 works, the motor drives the wind wheel to rotate, indoor oil smoke is sucked, the oil smoke is subjected to first oil smoke separation through the first oil filtering mechanism and then enters the air duct, the oil smoke is subjected to second oil smoke separation through rotation of the wind wheel, the oil smoke in the air duct is acted by centrifugal force generated by the wind wheel, and oil mist integrated oil drops are collected.

In a particular embodiment, the first oil filtering mechanism comprises an oil screen. It should be understood that in other embodiments, the first oil filter mechanism may be arranged in other forms, and is not limited herein.

The range hood 100 also includes an oil cup mounted to the oil screen for receiving grease remaining from the oil screen. It is understood that in other embodiments, the oil cup may be mounted on the casing 10, and is not limited herein.

The range hood 100 further includes a second oil filtering mechanism 20, the second oil filtering mechanism 20 is disposed between the air outlet 11 of the casing 10 and the outside, and the second oil filtering mechanism 20 is located on a path through which the oil smoke circulates from the air outlet 11 of the casing 10 to the outside. In the range hood 100 of the present embodiment, the second oil filtering mechanism 20 can filter the oil smoke flowing out from the air outlet 11 of the housing 10 again, so as to reduce the amount of oil carried by the oil smoke exhausted to the atmosphere, reduce air pollution, and protect the environment. That is, in the range hood 100 of the present embodiment, the oil smoke filtered by the first oil filtering mechanism and the fan is discharged from the air outlet 11 of the casing 10, filtered again by the second oil filtering mechanism 20, and then discharged to the outside, so that the amount of oil carried by the oil smoke discharged to the atmosphere is reduced, the atmospheric pollution is reduced, and the environment is protected.

With reference to fig. 1, the range hood 100 further includes a smoke exhaust pipe 30, one end of the smoke exhaust pipe 30 is communicated with the air outlet 11 of the casing 10, and the second oil filtering mechanism 20 is disposed in the smoke exhaust pipe 30 or outside the smoke exhaust pipe 30. In the first embodiment, the second oil filtering mechanism 20 is arranged in the smoke exhaust pipe 30; in the second embodiment, the second oil filtering mechanism 20 is disposed outside the end of the smoke exhaust pipe 30 close to the air outlet 11 of the casing 10; in the third embodiment, the second oil filtering mechanism 20 is disposed outside an end of the smoke exhaust pipe 30 away from the air outlet 11 of the casing 10.

When the second oil filtering mechanism 20 is disposed outside the end of the smoke exhaust pipe 30 far away from the air outlet 11 of the casing 10, the range hood 100 further comprises a first joint 40, a second joint 50 and a third joint 60, two ends of the first joint 40 are respectively connected with one ends of the casing 10 and the smoke exhaust pipe 30, two ends of the second joint 50 are respectively connected with the other end of the smoke exhaust pipe 30 and one end of the second oil filtering mechanism 20, and two ends of the third joint 60 are respectively connected with the other end of the second oil filtering mechanism 20 and the external flue 200. It can be understood that, when the second oil filtering mechanism 20 is disposed outside the end of the smoke exhaust pipe 30 close to the air outlet 11 of the casing 10, two ends of the first joint 40 are respectively connected with one end of the casing 10 and one end of the second oil filtering mechanism 20, two ends of the second joint 50 are respectively connected with the other end of the second oil filtering mechanism 20 and one end of the smoke exhaust pipe 30, and two ends of the third joint 60 are respectively connected with the other end of the smoke exhaust pipe 30 and the external flue 200. It is also understood that when the second oil filtering mechanism 20 is disposed in the smoke exhaust pipe 30, the third joint 60 of the range hood 100 may be omitted, in which case both ends of the first joint 40 are respectively connected to the casing 10 and one end of the smoke exhaust pipe 30, and both ends of the second joint 50 are respectively connected to the other end of the smoke exhaust pipe 30 and the external flue 200.

Referring to fig. 2, in the first embodiment, the second oil filtering mechanism 20 includes at least one layer of oil filtering units arranged along the flow direction of the cooking fumes, and each layer of oil filtering unit includes at least one oil filtering plate 22. Each oil filter plate 22 has a groove facing away from the air outlet 11, the groove is disposed through the oil filter plate 22 along a first direction, and the first direction (extending direction of the oil filter plate 22) is parallel to a plane where the oil filter plate 22 is located and is inclined with respect to the flow direction of the oil smoke. With this arrangement, when oil smoke passes through the oil filter 22, two sides of the oil filter 22 periodically drop out double-row line vortices which are opposite in rotation direction and regularly arranged, and a von karman vortex is formed due to a nonlinear effect. The grease in the oil smoke impacts the groove wall of the groove of the oil filter plate 22 along with the centrifugal force of the vortex and is attached to the groove wall of the groove, thereby achieving the purpose of oil smoke separation.

The direction of extension of each oil filter panel 22 is inclined relative to the horizontal so that grease collected in the recess can flow out of the recess to be collected. Further, the groove wall of the groove of each oil filter plate 22 is provided with a smooth structure, so that the grease can be dropped conveniently.

Specifically, the oil filter plate 22 is elongated and extends in the first direction, the cross-sectional shape of the oil filter plate 22 is arc-shaped with an opening facing away from the air outlet 11, and a groove is formed on the side of the oil filter plate 22 having the opening. It will be appreciated that in other embodiments, the cross-sectional shape of the oil filter plate 22 is not limited. As another embodiment, the oil filter plate 22 is a long strip extending along the first direction, and the cross-sectional shape of the oil filter plate 22 is a bent shape with an opening facing away from the air outlet 11. More specifically, the first direction is perpendicular to the flow direction of the soot.

Further, the second oil filtering mechanism 20 further includes a casing 21, and the oil filtering unit is provided in the casing 21. Specifically, a gap b (see fig. 1) is provided between the lower end of each oil filter plate 22 and the inner wall of the casing 21, so that grease can flow out from the gap b between the oil filter plate 22 and the casing 21.

The second oil filtering mechanism 20 includes at least two layers of oil filtering units, and every two adjacent layers of oil filtering units are arranged at intervals to increase the oil filtering rate of the second oil filtering mechanism 20.

In the first embodiment, the second oil filtering mechanism 20 includes a two-layer oil filtering unit. In the second embodiment, the second oil filtering mechanism 20 includes a three-layer oil filtering unit. In the third embodiment, the second oil filtering mechanism 20 includes a four-layer oil filtering unit. It should be understood that in other embodiments, the second oil filtering mechanism 20 may include only one oil filtering unit, or may include more than four oil filtering units, and is not limited herein.

At this time, the more the number of layers of the oil filtering units included in the second oil filtering mechanism 20 is, the greater the wind resistance of the range hood 100 is, the greater the smoking effect of the range hood 100 is affected, so the second oil filtering mechanism 20 generally includes two layers of oil filtering units or three layers of oil filtering units.

Each layer of oil filtering unit comprises at least two oil filtering plates 22 arranged along the second direction. The second direction is parallel to the plane of the oil filter plate 22 and is inclined with respect to the flow direction of the oil smoke. In the first embodiment, each oil filtering unit is provided with 7 oil filtering plates 22 along the second direction; in the second embodiment, each oil filtering unit is provided with 8 oil filtering plates 22 along the second direction; in the third embodiment, each oil filtering unit is provided with 9 oil filtering plates 22 along the second direction. It should be understood that in other embodiments, each oil filter unit may have less than 7 oil filter plates 22 or more than 9 oil filter plates 22 along the second direction, and the invention is not limited thereto. Specifically, the second direction is perpendicular to both the flow direction of the lampblack and the first direction.

In a preferred embodiment, the number of the oil filter plates 22 arranged in the second direction is based on that the whole housing 21 can be just filled, so that all the oil smoke entering the housing 21 can be filtered by the oil filter plates 22, and the filtering effect is good.

Further, the oil filter plates 22 included in each two adjacent layers of oil filter units are arranged opposite to each other in the flow direction of the oil smoke, so that the oil smoke can flow conveniently. In the embodiment, the number of the oil filter plates 22 included in each two adjacent layers of oil filter units is equal, and all the oil filter plates 22 have the same shape. It should be understood that in other embodiments, the number of oil filter plates 22 included in each adjacent oil filter unit may be different, and the shape of all of the oil filter plates 22 may also be different.

In one embodiment, the second oil filtering mechanism 20 includes three layers of oil filtering units, which are respectively located in the first layer of oil filtering unit (the lowest layer in fig. 2), the second layer of oil filtering unit (the middle layer in fig. 2), and the third layer of oil filtering unit (the uppermost layer in fig. 2). The number of the oil filtering plates 22 included in the first layer of oil filtering unit, the second layer of oil filtering unit and the third layer of oil filtering unit is equal. Specifically, the first layer oil filtering unit, the second layer oil filtering unit and the third layer oil filtering unit all include 8 oil filtering plates 22, and the 8 oil filtering plates included in the first layer oil filtering unit, the second layer oil filtering unit and the third layer oil filtering unit are in one-to-one correspondence from top to bottom.

The distance between every two adjacent oil filtering units is not too close to avoid influencing the generation of the vortex. In one embodiment, the distance H between each two adjacent layers of oil filter units may be set to be 3 times the thickness C of the oil filter plates 22 (see fig. 3). It should be understood that in other embodiments, the distance H between two adjacent oil filter units may also be 4 times or more than 4 times the thickness C of the oil filter plates 22, and is not limited herein.

Specifically, the distance a between every two adjacent oil filter plates 22 included in each layer of oil filter unit is set to be 1.5 times the width t of a single oil filter plate.

Fig. 3 shows a layout of a second oil filtering mechanism 20 for extracting oil smoke according to another embodiment of the present invention.

In the second embodiment, the second oil filtering mechanism 20 includes at least one layer of oil filtering units arranged along the flow direction of the lampblack, and each layer of oil filtering unit includes at least one oil filtering plate 22. Each oil filter plate 22 has a groove facing away from the air outlet 11, and the groove penetrates through the oil filter plate 22 along the extending direction of the oil filter plate 22. With this arrangement, when oil smoke passes through the oil filter 22, two sides of the oil filter 22 periodically drop out double-row line vortices which are opposite in rotation direction and regularly arranged, and a von karman vortex is formed due to a nonlinear effect. The grease in the oil smoke impacts the groove wall of the groove of the oil filter plate 22 along with the centrifugal force of the vortex and is attached to the groove wall of the groove, thereby achieving the purpose of oil smoke separation.

The direction of extension of each filter panel 22 is inclined relative to the horizontal so that grease collected in the recess can flow out of the recess to be collected.

The oil filter plate 22 is elongated and extends in the first direction, and the cross-sectional shape of the oil filter plate 22 is a bent shape with an opening facing away from the air outlet 11. Specifically, the cross section of the oil filter plate 22 is formed into a V shape, and the side of the oil filter plate 22 facing away from the air outlet 11 has a groove.

The second oil filtering mechanism 20 includes at least two layers of oil filtering units, and every two adjacent layers of oil filtering units are arranged at intervals. In the first embodiment, the second oil filtering mechanism 20 includes a two-layer oil filtering unit; in the second embodiment, the second oil filtering mechanism 20 includes a three-layer oil filtering unit. It should be understood that in other embodiments, second oil filter mechanism 20 may include only one oil filter unit, four oil filter units, five oil filter units, or more than five oil filter units, and is not limited herein.

Each layer of oil filtering unit comprises at least two oil filtering plates 22 arranged along the second direction, and the oil filtering plates 22 of each two adjacent layers of oil filtering units are arranged in a staggered mode in the flowing direction of the oil smoke so as to increase the flowing path of the oil smoke and facilitate the separation of the oil smoke.

With reference to fig. 3, in the present embodiment, the second oil filtering mechanism 20 includes three layers of oil filtering units, which are respectively located in the first layer of oil filtering unit (the lowest layer in fig. 3), the second layer of oil filtering unit (the middle layer in fig. 3), and the third layer of oil filtering unit (the highest layer in fig. 3). The number of the oil filtering plates 22 included in the first layer of oil filtering unit is equal to that of the oil filtering plates 22 included in the third layer of oil filtering unit, and the number of the oil filtering plates 22 included in the second layer of oil filtering unit is different from that of the oil filtering plates 22 included in the first layer of oil filtering unit and the third layer of oil filtering unit. Specifically, the first layer oil filtering unit and the third layer oil filtering unit both include 8 oil filtering plates 22, and the 8 oil filtering plates 22 included in the first layer oil filtering unit and the third layer oil filtering unit correspond to each other one by one. The second layer of oil filtering unit comprises 7 oil filtering plates 22, and the 7 oil filtering plates 22 included in the third layer of oil filtering unit and the oil filtering plates 22 included in the first layer of oil filtering unit and the third layer of oil filtering unit are staggered up and down.

The embodiment of the utility model provides a smoke ventilator 100's theory of operation as follows:

when the range hood 100 works, the motor drives the wind wheel to rotate, indoor oil smoke is sucked, the oil smoke is subjected to first oil smoke separation through the first oil filtering mechanism and then enters the air duct, the oil smoke is subjected to second oil smoke separation through rotation of the wind wheel, the oil smoke in the air duct is acted by centrifugal force generated by the wind wheel, and oil mist integrated oil drops are collected. The oil smoke separated by the wind wheel is discharged from the air outlet 11 of the casing 10 to the smoke discharge pipe 30, and is discharged to the outside after being filtered again by the second oil filtering mechanism 20 from the smoke discharge pipe 30, so that the amount of oil carried by the oil smoke discharged to the atmosphere is reduced, the atmospheric pollution is reduced, and the environment is protected.

The embodiment of the utility model provides a smoke ventilator 100 has following beneficial effect:

1. the second oil filtering mechanism 20 filters the oil smoke discharged from the air outlet 11 of the casing 10 again, so that the amount of oil carried by the oil smoke discharged to the atmosphere is reduced, the atmospheric pollution is reduced, and the environment is protected;

2. the second oil filtering mechanism 20 comprises at least two layers of oil filtering units arranged at intervals in the flowing direction of the oil smoke, each layer of oil filtering unit comprises at least two oil filtering plates 22 arranged at intervals in the second direction, and when the oil smoke passes through the second oil filtering mechanism 20, the oil smoke is filtered by the plurality of oil filtering plates 22 included in the multi-layer oil filtering unit, so that the filtering effect is good;

3. the second oil filtering mechanism 20 includes two or three layers of oil filtering units arranged along the flow direction of the oil smoke, so that the oil filtering effect of the second oil filtering mechanism 20 is improved under the condition that the range hood 100 has a small wind resistance.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A range hood is characterized by comprising a shell (10), a fan and a first oil filtering mechanism, wherein an air duct with an air inlet and an air outlet (11) at two ends is arranged in the shell (10), the fan is used for providing power for enabling oil smoke to flow from the air inlet to the air outlet (11), and the first oil filtering mechanism is arranged in the air duct;

the range hood further comprises a second oil filtering mechanism (20), the second oil filtering mechanism (20) is arranged between the air outlet (11) of the shell (10) and the outside, and the second oil filtering mechanism (20) is located on a path through which the oil smoke flows from the air outlet (11) of the shell (10) to the outside.

2. A range hood according to claim 1, wherein the second oil filter mechanism (20) comprises at least one layer of oil filter units arranged in the flow direction of the cooking fumes, each layer of oil filter units comprising at least one oil filter plate (22);

each oil filtering plate (22) is provided with a groove which is arranged back to the air outlet (11), the groove penetrates through the oil filtering plates (22) along a first direction, and the first direction is parallel to a plane where the oil filtering plates (22) are located and is obliquely arranged relative to the flowing direction of the oil smoke.

3. A range hood according to claim 2, wherein the oil filter plate (22) is elongated and extends in the first direction, and the cross-sectional shape of the oil filter plate (22) is a circular arc with an opening facing away from the air outlet (11), the groove being formed on the side of the oil filter plate (22) having the opening.

4. A range hood according to claim 2, wherein each layer of oil filter units comprises at least two oil filter plates (22) spaced apart in a second direction;

the second direction is parallel to a plane where the oil filter plate (22) is located, and is inclined relative to the oil smoke flowing direction and the first direction.

5. The range hood of claim 4, wherein the second direction is perpendicular to both the flow direction of the soot and the first direction.

6. The range hood of claim 2, wherein the second oil filter mechanism (20) comprises at least two layers of the oil filter units, and each two adjacent layers of the oil filter units are arranged at intervals.

7. The range hood of claim 6, wherein the oil filter plates (22) included in each two adjacent layers of the oil filter units are arranged opposite to each other in the flow direction of the lampblack.

8. The range hood of claim 6, wherein the oil filter plates (22) of each two adjacent layers of the oil filter units are arranged in a staggered manner in the flow direction of the lampblack.

9. A hood according to claim 2, wherein the direction of extension of each oil filter plate (22) is arranged obliquely in relation to the horizontal.

10. The range hood according to claim 1, further comprising a smoke exhaust pipe (30), wherein one end of the smoke exhaust pipe (30) is communicated with the air outlet (11) of the machine shell (10);

the second oil filtering mechanism (20) is arranged in the smoke exhaust pipe (30) or outside the smoke exhaust pipe (30).

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