CN216307922U - Range hood with air purification function - Google Patents

Abstract

The utility model relates to a range hood with air purification function, comprising: the fan frame is internally provided with an air inlet duct; the smoke collecting hood is arranged at the bottom of the fan frame and is provided with a shoulder part which protrudes outwards relative to the fan frame, and the bottom of the smoke collecting hood is provided with a main air inlet; an auxiliary air channel communicated with the air inlet channel is defined in the shoulder part, a secondary air inlet communicated with the auxiliary air channel is further arranged at the bottom of the smoke collecting cover, the main air inlet, the air inlet channel, the auxiliary air channel and the secondary air inlet are in fluid communication, so that an air channel for external air to circularly flow is formed, and an auxiliary fan and an air purification module for purifying air flowing through the auxiliary air channel are arranged in the auxiliary air channel. Because the purification module is the shoulder position of the collection petticoat pipe that sets up, therefore can not receive the oil smoke can direct impact, prolonged life, especially, the reasonable setting that make full use of range hood's model structure goes on to can not make range hood's whole volume increase, occupy great installation space.

Description

Range hood with air purification function

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to a range hood with an air purification function.

Background

The range hood is a kitchen appliance for purifying the kitchen environment. The range hood generally includes a fan frame, a smoke collecting hood, and a fan system, wherein the fan system is disposed in the fan frame for providing negative pressure. The fume collecting hood is arranged at the bottom of the fan frame and is provided with an air inlet. Among the current range hood, be provided with the fender cigarette board that can overturn front and back and open and shut usually, wherein, keep off the cigarette board and open the back forward, can increase and hold together the cigarette district, reduced the oil smoke escape. For example, chinese patent application with application No. CN201611216640.1 (application publication No. CN106765398A) discloses such a range hood with a smoke baffle. However, in order to ensure that the smoke baffle can be turned over normally, a certain gap is required between the smoke baffle and the machine body, and when the oil smoke generated during cooking is large, the gap has the problem of smoke leakage.

In addition, in order to further improve the indoor environment of the kitchen, an internal circulation range hood is currently available, for example, chinese patent application with application number CN201910997414.9 (application publication number CN110671731A) discloses a range hood, which comprises a box body, wherein the box body is provided with a smoke inlet and a smoke outlet, and a flue between the smoke inlet and the smoke outlet; the first fan assembly is used for pumping the smoke from the smoke inlet to the smoke outlet; the internal circulation module is provided with a purification assembly and a second fan assembly, and the second fan assembly is used for pumping air to the indoor space through the purification assembly. The range hood can realize the oil smoke suction operation of the range hood through the first fan assembly, so that the range hood can be used for removing smoke in a kitchen; the range hood can purify air through the internal circulation module, and can be used as an air purifier when the range hood is in a non-working state, so that the range hood has the functions of removing oil smoke and purifying air, the indoor electric occupation space can be effectively saved, and the indoor space utilization efficiency is improved.

However, the range hood capable of internal circulation in the above patent still has certain deficiencies, and at first, the internal circulation module of this range hood is directly set up in the flue of box, and it has not only taken up the great space of flue, is unfavorable for the smooth and easy row of inhaling of oil smoke, and on the other hand, internal circulation module and fan system set gradually in the upper and lower direction of box, have increased range hood's whole height undoubtedly for whole volume increases, and the space requirement to the installation environment is higher. Secondly, the internal circulation module of will inhaling oil smoke directly sets up in the flue of box, and the oil smoke can directly impact purification module among the daily culinary art process, leads to purification module long-pending oil, and purifying effect descends gradually day by day, has reduced the life of internal circulation module.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the utility model is to provide a range hood which can make full use of the machine type structure of the range hood, reasonably arrange an internal circulation purification unit and realize the kitchen air purification function on the basis of ensuring smooth suction and exhaust of oil smoke.

The second technical problem to be solved by the utility model is to provide a range hood with an air purification function, which can reduce the problem of smoke leakage at the gap between a smoke baffle plate and a smoke collecting hood, aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving the first technical problem is as follows:

a range hood with air purification function includes:

the fan frame is internally provided with an air inlet duct, and a fan system is arranged in the air inlet duct;

the smoke collecting cover is arranged at the bottom of the fan frame and provided with a shoulder part which protrudes outwards relative to the fan frame, and a main air inlet communicated with the air inlet duct is arranged at the bottom of the smoke collecting cover;

inject in the shoulder with the supplementary wind channel of air inlet wind channel intercommunication, the bottom of collection petticoat pipe still be equipped with the inferior air intake of supplementary wind channel intercommunication, thereby main air intake, air inlet wind channel, supplementary wind channel and inferior air intake fluid intercommunication have constituted the wind channel that is used for supplying outside air circulation to flow, be equipped with auxiliary fan in the supplementary wind channel and be used for carrying out the air purification module that purifies to the air that flows through this supplementary wind channel.

In order to reasonably arrange the auxiliary fan and ensure the air inlet amount in the air purification process, the outlet of the auxiliary fan is over against the secondary air inlet, and the outlet of the auxiliary fan is over against the air purification module.

The air purification module can adopt various filtering devices capable of purifying the air in the kitchen, and is a filter plate which is arranged between the auxiliary air channel and the air inlet channel and separates the auxiliary air channel from the air inlet channel in order to be matched with the inner space of the auxiliary air channel.

The technical scheme adopted by the utility model for solving the second technical problem is as follows: still including keeping off the cigarette board, have relative first side and second side, should keep off the cigarette board with first side or rather than parallel straight line rotate for the axis of rotation and connect under the bottom of collection petticoat pipe to can open or close main air intake, inferior air intake is close to keep off the first side setting of cigarette board, and with the air intake is located respectively axis of rotation's both sides.

The smoke-collecting area of the range hood is effectively enlarged and the escape of oil smoke is reduced due to the arrangement of the smoke baffle plate.

In the operation process of the range hood, the secondary air inlet can suck the oil smoke escaping from the gap at the joint position of the smoke baffle and the smoke collecting cover into the air inlet duct in time, so that the oil smoke is prevented from continuously escaping to the outside of the range hood and influencing the kitchen environment.

In order to ensure the smoke collecting effect and the smoothness of an air channel in the air circulation and purification process, the smoke baffle plate at least has a first state and a second state in the rotating process relative to the smoke collecting hood;

when the smoke baffle is in a first state, the smoke baffle deflects to a position below the secondary air inlet, the primary air inlet is opened, and at least part of the smoke baffle is positioned outside the vertical projection of the smoke collecting cover on the horizontal plane;

the smoke baffle is in the second state, the smoke baffle deflects to under the main air inlet, open inferior air inlet, construct the mouth that overflows that supplies outside air current to pass through between smoke baffle and the collection petticoat pipe.

In order to avoid the flue gas to escape rapidly after coming out from the gap department that keeps off the cigarette board, the bottom part of collection petticoat pipe upwards caves in and forms a collection smoke chamber, main air intake locates on the wall of collection smoke chamber, the bottom of collection petticoat pipe still has and is located the periphery region in collection smoke chamber is as the water conservancy diversion wall, the water conservancy diversion wall certainly collection smoke chamber to the outer peripheral edges position of collection petticoat pipe upwards slopes gradually, inferior air intake locates the water conservancy diversion wall on.

In order to further improve the smoke collecting effect of the flow guide wall, the flow guide wall gradually inclines upwards from the smoke collecting cavity to the outer periphery of the smoke collecting cover, the included angle formed by the flow guide wall and the horizontal plane is A, and A is more than 8 degrees and less than 15 degrees.

The main air inlet and the corresponding secondary air inlet are respectively provided with one air inlet which can be suitable for a common use scene, but are matched with cooking stoves of a left cooking range and a right cooking range, so that the requirements of different cooking working conditions (different oil smoke amounts on the left side and the right side) are met, preferably, the main air inlet is positioned in the central area of the bottom of the smoke collecting hood and is divided into a first main air inlet on the left side and a second main air inlet on the right side, the number of the smoke blocking plates is two, namely a first smoke blocking plate and a second smoke blocking plate, the first smoke blocking plate and the second smoke blocking plate are respectively arranged on the left side and the right side of the bottom of the smoke collecting hood and respectively correspond to the first main air inlet and the second main air inlet, the number of the secondary air inlets is two, namely a first secondary air inlet and a second secondary air inlet, and the first primary air inlet is positioned on the left side of the first main air inlet, the second secondary air inlet is positioned on the right side of the second main air inlet.

In order to further improve the cigarette gathering effect of the cigarette blocking plate in the opening state, when the first cigarette blocking plate is in the first state, the first cigarette blocking plate inclines downwards from right to left and forms a first included angle with the horizontal plane as alpha, and when the second cigarette blocking plate is in the first state, the second cigarette blocking plate inclines downwards from left to right and forms a second included angle with the horizontal plane as beta, wherein alpha is more than 22 degrees and less than 53 degrees, and beta is more than 22 degrees and less than 53 degrees.

For make full use of collection petticoat pipe's left and right sides shoulder space, the shoulder is including relative fan frame is to left side convex first shoulder and relative fan frame is to right side convex second shoulder, first time air intake is located on the first shoulder, the inlet scoop is located for the second time on the second shoulder, auxiliary fan has two, is respectively for locating first auxiliary fan in the first shoulder with locate second auxiliary fan in the second shoulder, first auxiliary fan's export with first time air intake is relative, the export of second auxiliary fan with second time air intake is relative.

As an improvement, the auxiliary fan is a fan capable of rotating positively and negatively. When the range hood operates, the auxiliary fan rotates forwards to suck the oil smoke escaping from the gap at the joint of the smoke baffle and the smoke collecting cover into the air inlet duct in time, so that the oil smoke is prevented from continuously escaping to the outside of the range hood and influencing the kitchen environment. When the range hood is in a non-working state, the auxiliary fan can be switched to a reverse rotation state, so that indoor air is sucked from the main air inlet, filtered by the purification module and discharged from the secondary air inlet, and the purification of the indoor air in a kitchen is realized.

Compared with the prior art, the utility model has the advantages that: the utility model constructs the auxiliary air duct in the shoulder part of the smoke collecting hood, and arranges the auxiliary fan and the purifying module in the auxiliary air duct to realize the circulation purification of the air in the kitchen, wherein, in the process of sucking and exhausting the oil smoke by the range hood, the purifying module is the shoulder part of the smoke collecting hood, so the purifying module can not be directly impacted by the oil smoke, the service life is prolonged, especially, the purifying module is reasonably arranged by fully utilizing the machine type structure of the range hood, the integral volume of the range hood can not be increased, and the larger installation space is occupied. When the range hood is in a non-working state, the auxiliary fan can be started, so that the range hood can be used as an air purifier, and the range hood has the functions of removing oil smoke and purifying air. In addition, in the preferred scheme, the arrangement of the secondary air suction opening can suck the oil smoke escaping from the gap at the joint position of the smoke baffle and the smoke collecting cover into the air inlet duct in time, so that the oil smoke is prevented from continuously escaping to the outside of the oil smoke suction machine to influence the kitchen environment, wherein the secondary air suction opening is only used for auxiliary suction and exhaust of a small amount of oil smoke, and the service life of the purification module is not greatly influenced.

Drawings

Fig. 1 is a schematic perspective view of a range hood according to an embodiment of the present invention (a first smoke barrier and a second smoke barrier are both in a closed state);

fig. 2 is a schematic perspective view of a range hood according to an embodiment of the present invention (the first smoke barrier is in a closed state, and the second smoke barrier is in an open state);

fig. 3 is a schematic perspective view of a range hood according to an embodiment of the present invention (the first smoke barrier and the second smoke barrier are both in an open state);

FIG. 4 is a schematic perspective view of the structure of FIG. 3 at another angle;

FIG. 5 is a vertical cross-sectional view of FIG. 1 taken in a left-right direction;

FIG. 6 is a vertical cross-sectional view of FIG. 2 taken in a left-right direction;

fig. 7 is a vertical sectional view of fig. 3 taken in the left-right direction.

Detailed Description

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

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

Referring to fig. 1-7, a range hood includes a housing, a fan system (not shown), a smoke barrier, an auxiliary fan 30, and a purification module 40. The casing includes fan frame 11 and collection petticoat pipe 12, and collection petticoat pipe 12 locates the bottom of fan frame 11, and main air intake 13a,13b have been seted up to collection petticoat pipe 12's bottom. The fan system is arranged in the fan frame 11 and used for providing negative pressure for sucking and exhausting oil smoke, and is shown in detail in fig. 3.

The hood 12 has a left-right width dimension greater than that of the fan frame 11, and thus the hood 12 has shoulders 122a,122b projecting outward relative to the fan frame 11, specifically including a first shoulder 122a on the left side and a second shoulder 122b on the right side. The intake air duct 110 is defined inside the fan frame 11, and the first shoulder portion 122a and the second shoulder portion 122b of the smoke collecting hood 12 each define therein an auxiliary air duct 15 communicating with the intake air duct 110. The main air inlet at the bottom of the smoke collecting hood 12 faces the air inlet duct 110 and is communicated with the air inlet duct 110.

Referring to fig. 5, the auxiliary fan 30 and the cleaning module 40 are disposed in the auxiliary air duct 15. The auxiliary fan 30 is connected to the wall of the inner cavity of the fume collecting hood 12 through a fixing frame, and the air outlet of the auxiliary fan 30 is over against the secondary air inlets 14a and 14b of the fume collecting hood 12, so as to ensure the air volume in the air purification process. The air cleaning module 40 of this embodiment is a filter plate disposed between and separating the auxiliary air duct 15 and the intake air duct 110. The filter plate can adopt an adsorption plate structure with an activated carbon adsorption material in the prior art or other filter plate structures capable of realizing air purification.

The primary air inlet, the air inlet duct 110, the auxiliary air duct 15 and the secondary air inlets 14a,14b are in fluid communication with each other to form an air duct for circulating external air. After the auxiliary fan 30 is started, the external air can be circulated through the air duct, and the air is filtered and purified by the purifying module 40, and the flow path of the circulated and purified air is shown by the dotted line in fig. 5.

Referring to fig. 3, the central portion of the bottom of the smoke collecting hood 12 of the present embodiment is recessed upwards to form a smoke collecting cavity 120, wherein the main air inlets are disposed on the wall of the smoke collecting cavity 120, and are specifically divided into a first main air inlet 13a located on the left side and a second main air inlet 13b located on the right side, and the first main air inlet 13a and the second main air inlet 13b are arranged side by side in the left-right direction. The bottom of the fume collecting hood 12 is further connected with an oil cup 50, the oil cup 50 is integrally long-strip-shaped, and is arranged along the front-back direction of the fume collecting hood 12 and specifically located between the first main air inlet 13a and the second main air inlet 13 b.

Referring to fig. 7, the bottom of the fume collecting hood 12 also has a peripheral region in the fume collecting chamber 120, which is substantially flat and serves as a deflector wall 121. Wherein, the flow guide wall 121 on the left side of the smoke collection cavity 120 inclines upwards from right to left, and the flow guide wall 121 on the right side of the smoke collection cavity 120 inclines upwards from left to right. Specifically, the angle formed by the flow guide wall 121 and the horizontal plane is A, wherein A is more than 8 degrees and less than 15 degrees. Preferably, a is 10 °.

The oil smoke coming out from the gap of the smoke baffle (explained below) can continuously crawl along the wall of the guide wall 121 to avoid the oil smoke from rapidly diffusing and escaping, thereby ensuring that the oil smoke coming out from the gap of the smoke baffle enters the secondary air inlets 14a and 14b as much as possible.

Referring to fig. 1, there are two smoke barriers, namely a first smoke barrier 20a and a second smoke barrier 20b, and the first smoke barrier 20a and the second smoke barrier 20b have opposite first side 21 and second side 22. The first baffle 20a is rotatably connected with the first side 21 or a line parallel thereto as a rotation axis below the bottom of the first shoulder 122a of the smoke collecting hood 12, and similarly, the second baffle 20b is rotatably connected with the first side 21 or a line parallel thereto as a rotation axis below the bottom of the second shoulder 122b of the smoke collecting hood 12. Wherein the rotation axis of the first smoke barrier 20a and the rotation axis of the second smoke barrier 20b are both arranged to extend substantially forward and backward.

In order to realize the flexible turning of the smoke baffle, a gap m (see fig. 6) exists between the first side 21 of the smoke baffle and the bottom wall of the smoke collecting hood 12, which is difficult to avoid, and when the amount of smoke is large, the problem of smoke leakage from the gap m is likely to occur, for this reason, the bottom of the smoke collecting hood 12 of this embodiment is further provided with two secondary air inlets 14a,14b, the two secondary air inlets 14a,14b are respectively a first secondary air inlet 14a and a second secondary air inlet 14b, the first secondary air inlet 14a is provided on the left flow guide wall 121, that is, on the left side of the first main air inlet 13a, and the second secondary air inlet 14b is provided on the right flow guide wall 121, that is, on the right side of the second main air inlet 13 b.

With continued reference to fig. 6, the first sub air inlet 14a is disposed adjacent to the first side 21 of the first smoke barrier 20a, and the first sub air inlet 14a and the first main air inlet 13a are respectively located at two sides of the rotation axis. The second secondary air inlet 14b is disposed adjacent to the first side 21 of the second smoke baffle 20b, and the second secondary air inlet 14b and the second primary air inlet 13b are respectively located at two sides of the rotation axis corresponding thereto.

The smoke barrier (the first smoke barrier 20a and the second smoke barrier 20b) has a first state and a second state during turning over with respect to the smoke collecting hood 12. Taking the turning action of the first smoke barrier 20a as an example, in the first state, the first smoke barrier 20a opens the first main air inlet 13a and deflects to below the first sub air inlet 14 a. In this state, the second side 22 of the first smoke baffle 20a is partially located outside the vertical projection of the smoke collecting hood 12 on the horizontal plane, and can be applied to cooking operations with large amount of smoke, such as frying or frying, so as to increase smoke collecting areas of the range hood on the left and right sides and reduce smoke leakage, as shown in fig. 7 in detail. In the second state, the first smoke barrier 20a opens the first sub air inlet 14a and deflects to below the first main air inlet 13 a. The first smoke baffle 20a is inclined from top to bottom toward one side of the oil cup 50, a vertical projection of the second side 22 of the first smoke baffle 20a on a horizontal plane is located in the oil cup 50, and in the second state, the first smoke baffle 20a does not completely shield the first main air inlet 13a, specifically, an overflow port n is arranged between the second side 22 of the first smoke baffle 20a and the oil cup 50, so that external air enters the first main air inlet 13a, which is detailed in fig. 5. The turning process of the second cigarette blocking plate 20b is basically the same as the turning process of the first cigarette blocking plate 20a, and the description is omitted.

Referring to fig. 7, in the opened state of the first smoke barrier 20a, the first smoke barrier 20a is inclined downward from right to left and forms a first angle with the horizontal plane as α, and in the opened state of the second smoke barrier 20b, the second smoke barrier 20b is inclined downward from left to right and forms a second angle with the horizontal plane as β, wherein 22 ° < α < 53 °, 22 ° < β < 53 °, preferably α is 50 °, and β is 50 °.

Referring to fig. 7, the first side 21 of the first smoke baffle 20a of the present embodiment is rotatably connected to the guiding wall 121 located at the left side of the smoke collecting cavity 120, and the first side 21 of the second smoke baffle 20b is rotatably connected to the guiding wall 121 located at the right side of the smoke collecting cavity 120. The first smoke barrier 20a and the second smoke barrier 20b can independently rotate, and can be driven by various turnover driving mechanisms in the prior art, such as a turnover driving mechanism with a motor and a link mechanism.

The auxiliary fans 30 are respectively arranged in the auxiliary air ducts 15 of the first shoulder 122a and the second shoulder 122b of the smoke collecting hood 12, namely, a first auxiliary fan 30a located in the first shoulder 122a and a second auxiliary fan 30b located in the second shoulder 122b, wherein the first auxiliary fan 30a and the second auxiliary fan 30b are both capable of rotating in the forward direction and the reverse direction. When the range hood operates, the auxiliary fan 30 rotates forward to suck the oil smoke escaping from the gap at the joint of the smoke baffle and the smoke collecting hood 12 into the air inlet duct in time, so that the oil smoke is prevented from continuously escaping to the outside of the range hood to influence the kitchen environment. When the range hood is in a non-working state, the auxiliary fan 30 can be switched to a reverse rotation state, so that indoor air is sucked from the main air inlet, filtered by the purification module 40 and then discharged from the secondary air inlets 14a and 14b, and the indoor air in a kitchen is purified.

This embodiment constructs supplementary wind channel 15 in the shoulder of collection petticoat pipe 12, and set up auxiliary fan 30 and purification module 40 in supplementary wind channel 15 and realized the circulation purification to the kitchen room air, wherein, at range hood fume suction in-process, because purification module 40 is the shoulder position of the collection petticoat pipe 12 that sets up, therefore can not receive the oil smoke and can directly strike, service life has been prolonged, especially, above-mentioned purification module 40's setting is the reasonable setting that make full use of range hood's model structure goes on, and can not make range hood's whole volume increase, occupy great installation space. When the range hood is in a non-working state, the auxiliary fan 30 can be started, so that the range hood can be used as an air purifier, and the range hood has the functions of removing oil smoke and purifying air. In addition, in the preferred scheme, the secondary air inlet is arranged to suck the oil smoke escaping from the gap between the joint position of the smoke baffle and the smoke collecting hood 12 into the air inlet duct in time, so that the oil smoke is prevented from continuously escaping to the outside of the oil smoke suction hood to influence the kitchen environment, wherein the secondary air inlet is only used for auxiliary suction and exhaust of a small amount of oil smoke, and the service life of the purification module 40 is not greatly influenced.

On the basis of the above embodiments, other embodiments can be obtained by replacing and improving the related technical features. For example, the purification module 40 is not limited to the filter plate, and various filter devices capable of purifying air in the kitchen can be used. For another example, the filter plate as the purification module 40 is not necessarily disposed between the air inlet duct 110 and the auxiliary air duct 15, but may also be disposed in an area relatively far away from the air inlet duct 110 in the auxiliary air duct 15, so as to further reduce the contact between the oil smoke and the purification module 40 and prolong the service life. For another example, the guide wall 121 is not limited to an inclined arrangement, but may be a substantially horizontally extending arrangement.

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 from the first portion along a flow path or/and 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 conduit, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims (10)

1. A range hood with air purification function includes:

the fan frame (11) is internally provided with an air inlet duct (110), and a fan system is arranged in the air inlet duct (110);

the smoke collecting hood (12) is arranged at the bottom of the fan frame (11) and is provided with shoulders (122a and 122b) which protrude outwards relative to the fan frame (11), and a main air inlet (13) communicated with the air inlet duct (110) is formed in the bottom of the smoke collecting hood (12);

the method is characterized in that: an auxiliary air duct (15) communicated with the air inlet duct (110) is defined in the shoulders (122a,122b), secondary air inlets (14a,14b) communicated with the auxiliary air duct (15) are further arranged at the bottom of the smoke collecting hood (12), the main air inlet (13), the air inlet duct (110), the auxiliary air duct (15) and the secondary air inlets (14a,14b) are sequentially in fluid communication to form an air duct for circulating and flowing external air, and an auxiliary fan (30) and an air purification module (40) for purifying air flowing through the auxiliary air duct (15) are arranged in the auxiliary air duct (15).

2. The range hood with the air purification function according to claim 1, wherein: and the air outlet of the auxiliary fan (30) is over against the secondary air inlets (14a,14b) of the fume collecting hood (12).

3. The range hood with the air purification function according to claim 2, wherein: the air purification module (40) is a filter plate which is arranged between the auxiliary air duct (15) and the air inlet duct (110) and separates the auxiliary air duct from the air inlet duct.

4. The range hood with an air purification function according to any one of claims 1 to 3, wherein: still include and keep off cigarette board (20a,20b), it has relative first side (21) and second side (22), this keep off cigarette board (20a,20b) with first side (21) or the straight line parallel with it rotate for the axis of rotation to be connected under the bottom of collection petticoat pipe (12), inferior air intake (14a,14b) are close to keep off first side (21) setting of cigarette board (20a,20b), and with air intake (13) are arranged respectively on collection petticoat pipe (12) with the axis of rotation is the both sides of central line.

5. The range hood with the air purification function according to claim 4, wherein: the smoke barrier (20a,20b) has at least a first state and a second state during rotation relative to the smoke collecting hood (12);

in the first state of the smoke baffle (20a,20b), the smoke baffle (20a,20b) deflects to be below the secondary air inlet (14a,14b) and opens the primary air inlet (13), and at least part of the smoke baffle (20a,20b) is positioned outside the vertical projection of the smoke collecting hood (12) in the horizontal plane;

when the smoke baffle plate (20a,20b) is in the second state, the smoke baffle plate (20a,20b) deflects to the position below the main air inlet (13) and opens the secondary air inlet (14a,14b), and an overflowing opening (n) for passing external air flow is formed between the smoke baffle plate (20a,20b) and the smoke collecting hood (12).

6. The range hood with the air purification function according to claim 4, wherein: the local sunken collection cigarette chamber (120) that forms of bottom of collection petticoat pipe (12) upwards, main air intake (13) are located on the wall of collection cigarette chamber (120), the bottom of collection petticoat pipe (12) still has and is located the periphery region of collection cigarette chamber (120) is as water conservancy diversion wall (121), water conservancy diversion wall (121) certainly collection petticoat pipe (120) to the outer peripheral edges position of collection petticoat pipe (12) upwards inclines gradually, inferior air intake (14a,14b) are located water conservancy diversion wall (121) on.

7. The range hood with the air purification function according to claim 4, wherein: the main air inlet (13) is positioned in the central area of the bottom of the fume collecting hood (12), and is divided into a first main air inlet (13a) positioned at the left side and a second main air inlet (13b) positioned at the right side, two smoke baffles (20a,20b) are respectively a first smoke baffle (20a) and a second smoke baffle (20b), the first smoke baffle (20a) and the second smoke baffle (20b) are respectively arranged at the left side and the right side of the bottom of the smoke collecting hood (12), and respectively correspond to the first main air inlet (13a) and the second main air inlet (13b), the number of the secondary air inlets (14a,14b) is two, namely a first secondary air inlet (14a) and a second secondary air inlet (14b), the first secondary air inlet (14a) is positioned at the left side of the first main air inlet (13a), the second secondary air inlet (14b) is positioned at the right side of the second main air inlet (13 b).

8. The range hood with the air purification function according to claim 7, wherein: when the first smoke baffle plate (20a) is in a first state, the first smoke baffle plate (20a) inclines downwards from right to left and forms a first included angle with the horizontal plane as alpha, and when the second smoke baffle plate (20b) is in a first state, the second smoke baffle plate (20b) inclines downwards from left to right and forms a second included angle with the horizontal plane as beta, wherein alpha is larger than 0 degree and smaller than 45 degrees, and beta is larger than 0 degree and smaller than 45 degrees.

9. The range hood with the air purification function according to claim 7, wherein: the shoulder portions (122a,122b) include a first shoulder portion (122a) protruding to the left side relative to the fan frame (11) and a second shoulder portion (122b) protruding to the right side relative to the fan frame (11), the first secondary air inlet (14a) is disposed on the first shoulder portion (122a), the second secondary air inlet (14) is disposed on the second shoulder portion (122b), the number of the auxiliary fans (30) is two, the two auxiliary fans are respectively a first auxiliary fan (30a) disposed in the first shoulder portion (122a) and a second auxiliary fan (30b) disposed in the second shoulder portion (122b), an outlet of the first auxiliary fan (30a) is opposite to the first secondary air inlet (14a), and an outlet of the second auxiliary fan (30b) is opposite to the second secondary air inlet (14 b).

10. The range hood with the air purification function according to claim 5, wherein: the auxiliary fan (30) is a fan capable of rotating forward and backward.

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