CN113217969B

CN113217969B - Fume exhaust fan

Info

Publication number: CN113217969B
Application number: CN202110599597.6A
Authority: CN
Inventors: 唐兴旺; 袁柯铭
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-08-05
Anticipated expiration: 2041-05-31
Also published as: CN113217969A

Abstract

The invention discloses a range hood, which comprises a fan frame for arranging a fan system, and further comprises a hollow lower box body, wherein the lower box body is positioned below the fan frame and is in fluid communication with the fan frame; the range hood further comprises a filtering device, the filtering device is used for oil smoke gas flows of the first cavity and the second cavity to pass through, and the filtering device can move left and right, so that the passing proportion of the oil smoke gas flows of the first cavity and the second cavity is changed. Compared with the prior art, the invention has the advantages that: the total air quantity does not need to be increased so as to solve the problem that the oil fume suction effect can be greatly improved on the same side of the corresponding range hood when one side is fried and cooked.

Description

Fume exhaust fan

Technical Field

The invention relates to an oil fume purification device, in particular to a range hood.

Background

Chinese cooking can generate a large amount of oil smoke, and in order to keep the kitchen environment clean and the human health, the range hood becomes one of indispensable kitchen household appliances in modern families. The range hood generally comprises a top suction type range hood and a side suction type range hood, and the top suction type range hood has more and more extensive application due to the advantages of being neat and light, small in occupied space, good in matching with a hanging cabinet, low in noise and the like.

The top-suction type range hood generally comprises a smoke collecting hood and a fan frame positioned on the smoke collecting hood, wherein a volute, an impeller and a motor for driving the impeller are installed in the fan frame, the center of the smoke collecting hood is provided with an air inlet which is directly connected with a high negative pressure area where the fan is positioned, and the range hood of the type can be provided with a filter screen at the air inlet, so that the oil smoke can be partially filtered when passing through the filter screen and then enters the range hood, and is further filtered by the centrifugal force of the fan.

The oil smoke can filter the big granule (generally be greater than PM10) greasy dirt when passing through the filter screen, and inside reentrant range hood, then further filter remaining tiny particle greasy dirt through fan centrifugal force. If not set up the filter screen, then can lead to a large amount of large granule oil smoke to get into fan system, if a large amount of oil smoke granules are attached to the impeller, then can destroy impeller dynamic balance, make the lampblack absorber shake aggravation, the noise rises. The existing filter screens generally do not have self-cleaning capability, and can block an oil screen after long-term use, so that the air inlet resistance is increased, the smoking effect is reduced, and the filter screens usually need to be detached regularly for cleaning.

Steam washing is applied to a range hood product as a novel self-cleaning technology, and is often arranged in a fan system of the range hood for cleaning an impeller of the range hood. However, the nozzle and the pipeline are exposed in the oil smoke channel, the nozzle can be blocked when the oil smoke channel is in an oil smoke environment for a long time, and oil stains can corrode the pipeline, so that the cleaning function is invalid.

In addition, the burner of a common household cooker is usually divided into two parts, namely a left burner and a right burner, so that a user sometimes only uses one burner and sometimes uses two burners simultaneously in the cooking process, but the household cooker often only uses one burner to fry a large amount of oil smoke. If the user only uses the left burner to cook or use the right burner to cook or steam rice, the oil smoke concentration and the oil smoke particle potential on the left side of the range hood are necessarily much larger than those on the right side, so that the oil smoke is often escaped in the unilateral quick-frying cooking. The common solution is to increase the rotation speed of the impeller to increase the total air volume of the range hood, and the increase of the total air volume can bring about the simultaneous increase of the left air volume and the right air volume, thereby improving the oil smoke absorption effect. Obviously the promotion of impeller rotational speed will lead to the noise to increase by a wide margin, influences people healthy, and the stir-fry of actually cooking takes place in one side, and both sides promote the energy consumption waste that the amount of wind leads to one side in addition simultaneously. How to solve the problem that the oil smoke quantity difference on the two sides is large under the condition of not improving the air quantity is also an urgent need to be solved in the field.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood which can adjust the distribution of flow on two sides and improve the range hood effect, aiming at the defects in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood, is including being used for setting up the fan frame of fan system, its characterized in that: the range hood also comprises a hollow lower box body, the lower box body is positioned below the fan frame and is in fluid communication with the fan frame, the bottom of the lower box body is provided with a first air inlet and a second air inlet which are arranged at intervals from left to right, a first cavity and a second cavity which are used as air inlet cavities are formed inside the lower box body, the first air inlet corresponds to the first cavity, and the second air inlet corresponds to the second cavity; the range hood further comprises a filtering device, the filtering device is used for oil smoke gas flows of the first cavity and the second cavity to pass through, and the filtering device can move left and right, so that the passing proportion of the oil smoke gas flows of the first cavity and the second cavity is changed.

Preferably, filter equipment's structure does, filter equipment is including setting up the filtration box at first cavity and second cavity rear side, it is the open cavity box in top and constitutes the air outlet in uncovered department to filter the box, the front side of filtering the box is provided with the filter screen, it pastes tightly with the rear side of box down to filter the box, the space between the rear side of filtering box and first cavity and second cavity is sealed respectively.

Preferably, in order to better distribute the flow rate of the left side and the right side, a first baffle and a second baffle extending back and forth are arranged in the lower box body, the first baffle is arranged on the left side of the second baffle at intervals, the first chamber is positioned on the left side of the first baffle, the second chamber is positioned on the right side of the second baffle, and the length of the filtering box body in the left-right direction is not less than the distance between the first baffle and the second baffle; the top of filtering the box is provided with first baffle and second baffle, first baffle is extended right by the left side of lower box, the second baffle is extended left by lower box right side, the right-hand member of first baffle flushes with first baffle, the left end and the second baffle of second baffle flush.

Preferably, for the convenience of sealing the unilateral air inlet, the left side and the right side of the filtering box body respectively form a first blocking wall and a second blocking wall, the space between the rear ends of the first blocking wall and the first baffle can be sealed, and the space between the rear ends of the second blocking wall and the second baffle can be sealed.

In order to realize primary self-cleaning, the range hood further comprises a self-cleaning device, a first baffle and a second baffle which extend forwards and backwards are arranged in the lower box body, the first baffle is arranged on the left side of the second baffle at intervals, the first chamber is positioned on the left side of the first baffle, the second chamber is positioned on the right side of the second baffle, and the length of the filtering box body in the left-right direction is not less than the distance between the first baffle and the second baffle; the self-cleaning device comprises a first oil scraping plate arranged at the rear end of the first baffle and a second oil scraping plate arranged at the rear end of the second baffle, and the first oil scraping plate and the second oil scraping plate are respectively abutted to the filter screen.

In order to realize secondary self-cleaning and simultaneously avoid the exposure of clean parts in an oil way, the self-cleaning device further comprises a water tank, a water pump and a water pipe, wherein the water tank is used for storing cleaning liquid, the water pump can pump the cleaning liquid in the water tank into the water pipe, and the end part of the water pipe is provided with a nozzle used for spraying the cleaning liquid onto the filter screen.

In order to facilitate the spray cleaning, a steam cleaning method is preferably adopted, and the self-cleaning device further comprises a heater for heating the heating part, wherein a steam generator is arranged on a fluid path between the nozzle and the water pipe, and part of the water pipe forms the heating part.

In order to further avoid the exposure of clean parts in the oil circuit, a third baffle is further arranged in the lower box body and connected between the rear end parts of the first baffle and the second baffle, a cleaning cavity is formed by the space among the first baffle, the second baffle and the third baffle, the water tank and the water pump are arranged in the cleaning cavity, and the water pipe penetrates through the third baffle.

Compared with the prior art, the invention has the advantages that: the ventilation area in the left air inlet cavity and the right air inlet cavity is changed through the movement of the filter screen, so that a scheme suitable for flow distribution of the left air inlet and the right air inlet is provided, the total air quantity does not need to be increased (namely the rotating speed of the impeller is unchanged, the noise and the energy consumption are not increased), and the problem that the oil smoke absorption effect can be greatly improved on the same side of the range hood corresponding to the impeller when one-side stir-frying cooking is carried out is solved; through setting up self-cleaning device, tentatively strike off the filter screen greasy dirt through scraping the oil strip at the air inlet intracavity and carry out a cleanness, again with filter screen immigration in clean chamber, carry out steam cleaning, it is clean for the secondary degree of depth, even if guarantee range hood uses for a long time, can not block up the oil net yet, and self-cleaning device is independent of the oil smoke passageway, the oil smoke can not pass through promptly, can not polluted by the oil smoke, just there is not the nozzle to block up yet, the problem of greasy dirt corruption pipeline.

Drawings

FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;

fig. 2 is a schematic view of a range hood according to an embodiment of the present invention (from bottom to top, different from the view angle of fig. 1);

fig. 3 is a partial cross-sectional view (looking right back forward) of a range hood according to an embodiment of the present invention;

fig. 4 is a sectional view (transverse section) of a range hood according to an embodiment of the present invention;

fig. 5 is a partial cross-sectional view of a range hood according to an embodiment of the present invention (front-to-back cross-section, hidden fan frame and fan system);

FIG. 6 is an exploded view of the self-cleaning device and the flow distribution device of the range hood according to the embodiment of the present invention;

FIG. 7 is a cross-sectional top view of the initial state of the range hood in accordance with the embodiment of the present invention;

FIG. 8 is a cross-sectional top view of the range hood of the present invention with increased left side intake;

FIG. 9 is a cross-sectional top view of the range hood of the present invention with increased left side inlet air to maximum (right side closed);

FIG. 10 is a perspective view of FIG. 9;

fig. 11 is a schematic cross-sectional perspective view of the range hood according to the embodiment of the present invention, which increases the right side intake air to the maximum (left side closed).

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 5, a range hood includes a box structure composed of an upper box 1, a middle box 2, and a lower box 3, and a fan frame 4, wherein the upper box 1 is disposed under the fan frame 4, and the length of the upper box in the left-right direction is greater than that of the fan frame 4. The upper box body 1, the middle box body 2 and the lower box body 3 are all hollow box bodies. The bottom of the rear side of the upper box body 1 is connected with the top of the middle box body 2, the bottom of the middle box body 2 is connected with the rear side of the lower box body 3, the upper box body 1 and the middle box body 2 are in fluid communication with each other, the middle box body 2 and the lower box body 3 are in fluid communication with each other, and the upper box body 1 is in fluid communication with the air frame 4. The sizes of the upper box body 1 and the lower box body 3 in the front and back direction are larger than that of the middle box body 2, the middle box body 2 is a box body with a thin structure in the front and back direction, namely, the sectional area is reduced when the lower box body 3 is transited to the middle box body 2, and the sectional area is increased when the middle box body 2 is transited to the upper box body 1. A fan system (not shown) is provided in the fan frame 4.

The front side of the fan frame 4 is positioned behind the front side of the upper box body 1. After the range hood is installed, the fan frame 4 is hidden on the back of the hanging cabinet, the front part of the upper box body 1 is flush with the door plate of the hanging cabinet, and the top of the upper box body 1 can be used as a bottom plate of the hanging cabinet, so that the matching with the whole appearance of the hanging cabinet with better consistency is formed.

In the present embodiment, the upper case 1 and the intermediate case 2 are integrally formed. The upper box body 1 or the middle box body 2 or the upper box body 1 and the middle box body 2 are not arranged, and the fan frame 4 is directly connected with the lower box body 3.

The bottom of the lower box 3 is provided with a first air inlet 51 and a second air inlet 52 which are arranged at intervals in the left-right direction. The lower case 3 includes a top wall 31 and a bottom wall 32 spaced up and down, a front side wall 33 and a rear side wall 34 spaced front and rear, and a left side wall 35 and a right side wall 36 spaced left and right. Wherein, the rear end of the top wall 31 extends to the bottom front side of the middle box body 2, the front side wall 33 is connected between the front end parts of the top wall 31 and the bottom wall 32, the rear side wall 34 is connected between the rear side of the middle box body 2 and the rear end part of the bottom wall 32, the left side wall 35 is connected between the left end parts of the top wall 31, the bottom wall 32, the front side wall 33 and the rear side wall 34, and the right side wall 36 is connected between the right end parts of the top wall 31, the bottom wall 32, the front side wall 33 and the rear side wall 34. Preferably, the top wall 31 and the bottom wall 32 are horizontal, and the front side wall 33, the rear side wall 34, the left side wall 35 and the right side wall 36 are vertical, so that the lower casing 3 is a rectangular parallelepiped. The first air inlet 51 and the second air inlet 52 are opened in the bottom wall 32. The top wall 31 can be used for placing objects.

The lower case 3 is provided inside with a first baffle 37, a second baffle 38 and a third baffle 39, the first baffle 37 and the second baffle 38 being arranged at a left-right interval and each extending rearward from the front side wall 33. The first and

second shutters

37 and 38 have a smaller dimension in the front-rear direction than the left and

right side walls

35 and 36, i.e., a certain interval is provided between the rear ends of the first and

second shutters

37 and 38 and the rear side wall 34. A third baffle 39 is connected between the rear ends of the first and

second baffles

37 and 38, preferably flush with the front side of the intermediate box 2. The first intake vent 51 is located between the left sidewall 35 and the first baffle 37, and the second intake vent 52 is located between the right sidewall 36 and the first baffle 37. And a first baffle 37 and a second baffle 38 are connected between the top wall 31 and the bottom wall 32, respectively. The first baffle 37 and the second baffle 38 may be parallel to the left side wall 35 (right side wall 36), respectively. The space between the left side wall 35, the first baffle 37, the top wall 31, the front side wall 33, and the rear side wall 34 constitutes a first chamber Q1, and the space between the right side wall 36, the second baffle 38, the top wall 31, the front side wall 33, and the rear side wall 34 constitutes a second chamber Q2. The first chamber Q1 and the second chamber Q2 are air intake chambers and are located at the front side of the middle case 2.

In the lower box 3, if the position corresponding to the middle box 2 is provided with the filtering device 6, the filtering device 6 comprises a filtering box 61, the filtering box 61 is a hollow box with an open top, therefore, the filtering box 61 is communicated with the fluid in the middle box 2, and the open position forms an air outlet 63. The length of the filter case 61 in the left-right direction is larger than the interval between the first baffle 37 and the second baffle 38. The filtering device 6 further comprises a filter screen 62 arranged on the side (front side) of the filtering case 61 facing the first baffle 37 and the second baffle 38, through which screen 62 the oil fume flow can pass to enter the filtering case 61, as indicated by the arrows in fig. 3. One side of the filter box body 61 close to the rear side wall 34 of the lower box body 3 is tightly attached to the rear side wall 34.

The filtering device 6 further comprises a driving mechanism 64 for driving the filtering box 61 to move left and right, and the driving mechanism 64 can be any existing linear driving module, such as a combination of a motor lead screw and a nut shown in this embodiment, or a combination of an electric push rod, an air cylinder or a motor gear rack. A guide rail 65 is provided between the bottom of the filter case 61 and the bottom wall 34 of the lower case 3 to guide the movement of the filter case 61 while defining the movement locus of the filter case 61.

In the lower box 3, the junction of the middle box 2 and the lower box 3 or the middle box 2, a first partition plate 66 and a second partition plate 67 which extend transversely and preferably extend horizontally are respectively arranged at the top of the filtering box 61, wherein the first partition plate 66 extends rightwards from the left side of the lower box 3 to shield a part of the air outlet 63, the second partition plate 67 extends leftwards from the right side of the lower box 3 to shield a part of the air outlet 63, and oil smoke flows into the middle box 2 from the space between the first partition plate 66 and the second partition plate 67. The right end of the first partition 66 may be flush with the first baffle 37 and the left end of the second partition 67 may be flush with the second baffle 38, thereby preventing the filter housing 61 from entering the filter housing 61 from a position other than the filter screen 62 at the portions of the first chamber Q1 and the second chamber Q2.

The left and right sides of the filter case 61 respectively constitute a first blocking wall 611 and a second blocking wall 612, which are respectively parallel to the first blocking plate 37 (left side wall 35).

Referring to fig. 4 and 6, a self-cleaning device is further provided in the lower case 3, and includes a first oil scraping plate 71 provided on a side of the first baffle 37 facing the filter case 61 and a second oil scraping plate 72 provided on a side of the second baffle 38 facing the filter case 61. The first oil scraping plate 71 and the second oil scraping plate 72 can respectively collide with the filter screen 62, so that oil stains on the filter screen 62 can be preliminarily scraped when the filter device 6 moves, and primary cleaning is completed to reduce the cleaning time of secondary cleaning. The portion of the screen 62 located between the first and second

oil scraping plates

71, 72 is not available for the oil smoke gas flow to pass through.

The space between the first baffle 37, the second baffle 38 and the third baffle 39 forms a cleaning chamber, the self-cleaning device further comprises a water tank 73, a water pump 74 and a water pipe 75 which are arranged in the cleaning chamber, and the water tank 73 is used for storing cleaning liquid. The water pipe 75 may be connected to the outlet of the water pump 74 and partially attached to the third baffle 39. The self-cleaning device further comprises a nozzle 76 and a heater 77, wherein the nozzle 76 may be disposed at a side of the third baffle 39 facing the filter housing 61, and the nozzle 76 is in fluid communication with the water pipe 75, whereby the water pump 74 pumps the liquid in the water tank 73. A steam generator 78 may be further provided in a fluid path between the nozzle 76 and the water pipe 75, so that the liquid heated by the heating part of the water pipe 75 passes through the steam generator 78 to be changed into a gas, and is sprayed from the nozzle 76. The portion of the water pipe 75 attached to the third baffle 39 forms a heating portion which may be curved, and the heater 77 is provided on the side of the third baffle 39 facing the filter housing 61 at a position corresponding to the heating portion, so that the cleaning liquid in the water pipe 75 can be heated.

Referring to fig. 7, when the two burners of the two cookers cook simultaneously, the filter box 61 is moved to the middle position, so that it is positioned at the left side of the first baffle 7 and at the right side of the second baffle 38The area of the side filter screen 62 is the same, and the flow rate of the left and right chambers is the same, i.e. the suction of the left and right air inlets is the same. Referring to fig. 8, assuming that the left side of the cooking range is stir-fried and cooked and the right side is steamed, for the range hood, the amount of smoke on the left side is greater than that on the right side, and the filter box 61 is controlled to move leftward, at this time, the area of the filter box 61 in the first chamber Q1 is greater, and the area in the second chamber Q2 is smaller, according to the principle of fluid continuity, Q is V S, where Q is the air volume, V is the flow velocity, and S is the sectional area. Let the total air flow through the filter net 62 be Q _{General assembly} Because the left and right displacement is the same, namely the total area of the air quantity passing through the filter screen is unchanged, the length of the left side passing through the filter screen is A, the length of the right side passing through the filter screen is B, and A is greater than B at the moment. Because of Q _{General assembly} The average wind speed flowing through the filter screen is not changed when the total area is not changed. The sum of the air volume Qleft entering from the first chamber Q1 and the air volume Qright entering from the second chamber Q2 is equal to the total air volume, namely Q _{General assembly} ＝Q _{Left side of} +Q _{Right side} When the filter box 61 moves to the left, a increases and B decreases, that is, the area of the left filter screen 62 increases, that is, the left air flow Q is constant at the average air speed _{Left side of} Increase right side air quantity Q _{Right side} And correspondingly, the air quantity of the first air inlet 51 at the left side of the range hood is increased, and the air quantity of the second air inlet 52 at the right side is reduced, so that a better smoking effect is achieved when the left side is fried and cooked. The right side is stir-fried and vice versa. If only one side is cooking, the other side can be completely closed, see fig. 9 and 10, and the right side is completely closed, with the sieve 62 completely to the left of the second apron 38, and the second apron 612 of the filter housing 61 can be flush with the second apron 38; referring also to fig. 11, the left side is completely closed, and the filter net 62 is completely located at the right side of the first baffle 37, and the first baffle wall 611 of the filter housing 61 may be flush with the first baffle 37. In the above process, the oil smoke flow path can be seen as shown by arrows in fig. 7 to 9.

The range hood of the present invention can also perform secondary cleaning, referring to fig. 9 and 10, the range hood moves to the left side completely through the filtering box 61, the filter screen 62 on the right side completely enters the cleaning station (between the first oil scraping plate 71 and the second oil scraping plate 72), at this time, steam washing is started, the water pump 74 brings the washing liquid in the water tank 73 to the steam generator through the water pipe 75, the washing liquid is vaporized through the steam generator 78, and then the washing liquid is sent into the cleaning chamber through the nozzle 76. When the liquid passes through the heating portion of the water pipe 75, the liquid is rapidly heated by the heater 77, and the steam sprayed from the nozzle 76 is in a high temperature state, and the filter 62 is steam-washed by the steam. At this time, the heater 77 continuously heats the water vapor between the third baffle 39 and the filter screen 62, so that the water vapor is always in a high temperature state, and the cleaning effect is further improved. After the cleaning is complete, the water pump 74 is stopped, moisture is no longer generated, and the heater 77 continues to heat and eventually dry the screen 62. The filter box 61 is then moved to the right completely so that the left screen 62 is completely moved to the cleaning station, where the left screen 62 can be hot cleaned.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims

1. The utility model provides a range hood, is including fan frame (4) that are used for setting up fan system, its characterized in that: the range hood further comprises a hollow lower box body (3), the lower box body (3) is located below the fan frame (4) and is in fluid communication with the fan frame, a first air inlet (51) and a second air inlet (52) which are arranged at left and right intervals are formed in the bottom of the lower box body (3), a first chamber (Q1) and a second chamber (Q2) which are used as air inlet chambers are formed in the lower box body (3), the first air inlet (51) corresponds to the first chamber (Q1), and the second air inlet (52) corresponds to the second chamber (Q2); the range hood further comprises a filtering device (6), the filtering device (6) is used for the oil smoke gas flow of the first chamber (Q1) and the second chamber (Q2) to pass through, and the filtering device (6) can move left and right, so that the passing proportion of the oil smoke gas flow of the first chamber (Q1) and the second chamber (Q2) is changed;

filter equipment (6) is including setting up filtering box (61) at first cavity (Q1) and second cavity (Q2) rear side, filtering box (61) are the open cavity box in top and constitute air outlet (63) in uncovered department, the front side of filtering box (61) is provided with filter screen (62), filter box (61) and the rear side of box (3) are pasted tightly down, the space between the rear side of filtering box (61) and first cavity (Q1) and second cavity (Q2) is sealed respectively.

2. The range hood of claim 1, wherein: a first baffle (37) and a second baffle (38) which extend forwards and backwards are arranged in the lower box body (3), the first baffle (37) is arranged on the left side of the second baffle (38) at intervals, the first chamber (Q1) is positioned on the left side of the first baffle (37), the second chamber (Q2) is positioned on the right side of the second baffle (38), and the length of the filter box body (61) in the left-right direction is not less than the distance between the first baffle (37) and the second baffle (38); the top of filtering box (61) is provided with first baffle (66) and second baffle (67), first baffle (66) are extended to the right by the left side of box (3) down, second baffle (67) are extended to the left by box (3) right side down, the right-hand member of first baffle (66) flushes with first baffle (37), the left end of second baffle (67) flushes with second baffle (38).

3. The range hood of claim 2, wherein: the left side and the right side of the filtering box body (61) respectively form a first blocking wall (611) and a second blocking wall (612), the space between the rear ends of the first blocking wall (611) and the first baffle (37) can be closed, and the space between the rear ends of the second blocking wall (612) and the second baffle (38) can be closed.

4. The range hood of claim 1, wherein: the range hood further comprises a self-cleaning device, a first baffle (37) and a second baffle (38) which extend forwards and backwards are arranged in the lower box body (3), the first baffle (37) is arranged on the left side of the second baffle (38) at intervals, the first chamber (Q1) is positioned on the left side of the first baffle (37), the second chamber (Q2) is positioned on the right side of the second baffle (38), and the length of the filter box body (61) in the left-right direction is not smaller than the distance between the first baffle (37) and the second baffle (38); the self-cleaning device comprises a first oil scraping plate (71) arranged at the rear end of the first baffle plate (37) and a second oil scraping plate (72) arranged at the rear end of the second baffle plate (38), wherein the first oil scraping plate (71) and the second oil scraping plate (72) respectively abut against the filter screen (62).

5. The range hood of claim 4, wherein: the self-cleaning device further comprises a water tank (73), a water pump (74) and a water pipe (75), wherein the water tank (73) is used for storing cleaning liquid, the water pump (74) can pump the cleaning liquid in the water tank (73) into the water pipe (75), and a nozzle (76) used for spraying the cleaning liquid onto the filter screen (62) is arranged at the end part of the water pipe (75).

6. The range hood of claim 5, wherein: a steam generator (78) is disposed on a fluid path between the nozzle (76) and the water pipe (75), a portion of the water pipe (75) constitutes a heating part, and the self-cleaning apparatus further includes a heater (77) for heating the heating part.

7. The range hood of claim 5, wherein: still be provided with third baffle (39) in lower box (3), third baffle (39) are connected between the rear end of first baffle (37) and second baffle (38), the space between first baffle (37), second baffle (38) and third baffle (39) constitutes clean chamber, water tank (73) and water pump (74) set up in clean intracavity, water pipe (75) pass third baffle (39).