CN110873347A

CN110873347A - Fume exhaust fan

Info

Publication number: CN110873347A
Application number: CN201810996594.4A
Authority: CN
Inventors: 卢翼天; 胡承杰; 茅忠群; 施旭娜; 李斌
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2018-08-29
Filing date: 2018-08-29
Publication date: 2020-03-10

Abstract

The invention relates to a range hood, which comprises a smoke collecting hood provided with an air inlet, wherein the front side of the smoke collecting hood is provided with a smoke guide plate which can move relative to the smoke collecting hood to open and close the air inlet, and the smoke guide plate comprises two first smoke guide plates respectively positioned at the left side and the right side and a second smoke guide plate positioned between the two first smoke guide plates; under the smoke deflector open mode, the second smoke deflector is located first smoke deflector front side, and the side that first smoke deflector is close to the second smoke deflector on left and right sides direction is located the side rear side of keeping away from the second smoke deflector, and the second smoke deflector forms main air intake between left and right sides direction and adjacent first smoke deflector, first smoke deflector forms supplementary air intake between left and right sides direction and collection petticoat pipe. The main air inlet of the oil smoke exhaust ventilator is close to the fan, the wind power is strong, the auxiliary air inlet plays a role in preventing oil smoke from escaping (escaping oil smoke is sucked by the auxiliary air inlet when moving along the two sides of the oil smoke collecting cover), and the plurality of air inlets are matched to achieve the optimal oil smoke exhaust effect.

Description

Fume exhaust fan

Technical Field

The invention relates to a household range hood, in particular to a range hood with a smoke guide plate.

Background

Most of the existing range hoods are provided with a smoke guide plate at an air inlet, and the smoke guide plate and the air inlet reserve a certain distance, so that the oil smoke can be effectively condensed and separated, and the oil absorption efficiency is relatively high.

For example, in the side-suction type range hood disclosed in the utility model with the patent number ZL201721255538.2 (publication number CN207196589U), the smoke guide plate is arranged in front of the air inlet.

Most of the existing smoke guide plates are shown in the above patents and are a whole plate, and the air inlet of the smoke guide plate is single, so that oil smoke far away from the air inlet is easy to escape; in addition, if the smoke guide plate is a large plane, the performance of the fan is stressed, more air quantity is lost, noise is high, the rapid oil smoke is poor in capture, and the oil smoke is easy to leak.

Although some patents are shown in a side-draft range hood disclosed in a chinese patent with a patent number ZL201611057819.7 (publication number CN108105813A), a left guide plate (i.e., a smoke guide plate), a right guide plate, and a fixed baffle plate located in the middle are disposed in the air inlet, and the left guide plate, the right guide plate, and the fixed baffle plate just cover the whole air inlet; or as shown in "a near-suction type range hood" disclosed in the chinese utility model patent No. ZL201721290304.1 (publication No. CN207214201U), the smoke guide plate of the range hood includes a first smoke guide plate movable on the left and right sides and a second smoke guide plate fixed between the two first smoke guide plates, and the first smoke guide plate can move in the inner direction or the outer direction of the housing.

Although aforementioned patent will lead the cigarette board segmentation design to the polylith, has solved the single problem of current air intake to a certain extent, but fixed stop and second lead the cigarette board still can oppress the fan, cause the performance of fan can not release completely, and the fan noise is big.

From the above, the smoke guide plate of the existing range hood still needs to be further improved.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a range hood which solves the problem of oppressing the performance of a fan by forming a plurality of air inlets between smoke guide plates, aiming at the current situation of the prior art.

The second technical problem to be solved by the present invention is to provide a range hood that prevents the air current from rushing to each other by guiding the flow of the smoke guide plate at the air inlet, in view of the current situation of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a range hood comprises a smoke collecting hood provided with an air inlet, wherein the front side of the smoke collecting hood is provided with a smoke guide plate which can move or deflect relative to the smoke collecting hood under the driving of a driving mechanism to open and close the air inlet, and the smoke guide plate comprises two first smoke guide plates respectively positioned at the left side and the right side and a second smoke guide plate positioned between the two first smoke guide plates;

the method is characterized in that: the air intake be in under the open mode, the second leads the cigarette board and is located first cigarette board front side, first cigarette board is led the side that the second led the cigarette board in the left and right sides direction is close to and is located the side rear side of keeping away from the second and leading the cigarette board, the second is led the cigarette board and is formed main air intake between the first cigarette board of leading with adjacent in the left and right sides direction, first cigarette board is in the left and right sides direction and is formed supplementary air intake between the collection petticoat pipe.

Because of the air current flow direction who gets into two main air intakes is opposite, for the air current that prevents to get into two main air intakes produces the offset, the central point of second smoke deflector is the sunken concave part that forms backward, just the concave part is including left side wall and right side wall and the roof of connecting left side wall and right side wall, and the left side wall inclines to the right from the front to the back, the right side wall inclines to the left from the front to the back. So, left side wall and right side wall carry out the water conservancy diversion to the air current that gets into, smoothly guide into the air intake on the collection petticoat pipe with the air current, avoid both sides air current offset to lead to the air current can not smoothly inhale, and cause the problem of noise.

The concave part can have various structural forms as long as the side walls on the left side and the right side can guide flow, preferably, the included angle between the left side wall and the top wall is 5-10 degrees, and the included angle between the right side wall and the top wall is 5-10 degrees, so that the best flow guide effect is achieved.

In order to further improve the flow guiding effect on the oil smoke, the plane of the first smoke guide plate in the opening state has an included angle relative to the plane of the first smoke guide plate in the closing state, and the included angle is 8-12 degrees. If the included angle is less than 8 degrees, then the supplementary effect of induced drafting is not obvious, if the included angle is greater than 12 degrees, the amount of wind is robbed with main air intake to supplementary air intake, is unfavorable for the reasonable distribution of negative pressure, and easily causes first smoke deflector to lead the cigarette effect and weaken, influences the smoking effect.

To facilitate the formation of the main air inlet, preferably, the main air inlet is formed by the driving mechanism driving the second smoke guide plate to extend forwards or/and driving the first smoke guide plate to deflect.

In order to facilitate the formation of the auxiliary air inlet, preferably, the auxiliary air inlet is formed by driving the first smoke guide plate to deflect or/and extend forwards by the driving mechanism.

Preferably, the driving mechanism comprises a driving device and a linkage mechanism arranged between the second smoke guide plate and the first smoke guide plate linked with the second smoke guide plate, and the driving device is connected with the second smoke guide plate in a driving way. Need not every smoke deflector so and set up one set of drive arrangement, reduce drive arrangement's quantity, it is few to relate to the part.

The linkage mechanism can have multiple structural style, preferably, the linkage mechanism includes first mount pad, connecting rod and second mount pad, terminal surface before first smoke deflector is located to first mount pad, second smoke deflector back is located to the second mount pad, and first mount pad and second mount pad are close to first smoke deflector and the adjacent both sides limit setting of second smoke deflector respectively, the connecting rod extends along left right direction, and the first end rotation of connecting rod installs on first mount pad, and the second end rotation of connecting rod installs on the second mount pad, the connecting rod leads the smoke deflector fore-and-aft swing relative to the second under the state that the second smoke deflector removed.

In order to limit the deflection track of the first smoke guide plate, a rotating shaft is rotatably arranged on the smoke collection cover, the rotating shaft is arranged close to the side edge of the first smoke guide plate adjacent to the second smoke guide plate and extends along the length direction of the side edge of the first smoke guide plate, and the back part of the first smoke guide plate is connected with the rotating shaft.

The driving device can have various structural forms, and preferably comprises a motor and a transmission mechanism connected with the output end of the motor and used for driving the second smoke guide plate to move back and forth, and the driving end of the transmission mechanism is connected with the second smoke guide plate.

The transmission mechanism can have multiple structural style, preferably, transmission mechanism includes lead screw, motor, connecting piece and push rod, the lead screw is driven by the motor and extends along the fore-and-aft direction, connecting piece threaded connection is on the lead screw, the push rod extends along the fore-and-aft direction, and one end is connected with the connecting piece, and the other end is connected with second smoke deflector. The motor drives the screw rod to rotate, and the connecting piece moves back and forth on the screw rod when the screw rod rotates, so that the push rod is driven to move back and forth, and the second smoke guide plate is further driven to move back and forth.

In order to assemble the driving device on the range hood, the motor is fixedly arranged on a fixing frame, the fixing frame is fixedly arranged relative to the fume collecting hood, and the push rod penetrates through the fixing frame to be connected with the second fume guide plate. Therefore, the driving device is integrally assembled on the fixed frame, and then the fixed frame is assembled on the smoke collecting cover, so that the assembly is convenient; and the fixed frame can also guide the moving track of the push rod.

For the side-draft range hood, when the smoke guide plates are in a closed state, the second smoke guide plate and the two first smoke guide plates are gradually inclined backwards from top to bottom and cover the front side of the plane where the air inlet is located. So lead the cigarette board not only can regard as range hood's panel under the closed condition, still have better guide cigarette effect for the ceiling type range hood, because of to the side-draught type range hood, the oil smoke can be along leading cigarette board rebound, and it is longer to the water conservancy diversion process of oil smoke to lead the cigarette board, specifically does: the side-draft range hood is characterized in that air enters from the bottom, the running direction of air flow can generate a wall attachment effect along a smoke guide plate, the running direction of the air flow is upward, and a chimney effect can be generated; for the top-suction type range hood, the oil smoke is lifted to the smoke guide plate and is quickly sucked into the air inlet, and the flow guide process is short.

In order to prevent the smoke guide plate from interfering with the smoke collecting hood when the smoke guide plate moves, a certain distance is reserved between the smoke guide plate and the smoke collecting hood in the left-right direction.

In order to further improve the smoking effect, the width of the first smoke guide plate in the left-right direction accounts for 0.5-0.8 of the width of the second smoke guide plate in the left-right direction. When the width of the first smoke guide plate is smaller than 50% of the width of the second smoke guide plate, the second smoke guide plate is too wide, and when the range hood works, the distance between the main air inlet and the fan is far, and the negative pressure value is low. When the width of the first smoke guide plate is greater than 80% of the width of the second smoke guide plate, when the range hood works, the first smoke guide plate deflects to shield an air inlet on the smoke collecting hood, the performance of the fan cannot be completely released, the maximum air quantity is influenced, and the noise is increased.

Compared with the prior art, the invention has the advantages that: 1. according to the invention, the smoke guide plates are arranged into three blocks, the first smoke guide plates positioned on the left side and the right side can deflect, and the second smoke guide plate positioned in the middle can move forwards relative to the air inlet, so that a main air inlet is formed between the second smoke guide plate and the adjacent first smoke guide plate in the left-right direction, an auxiliary air inlet is formed between the first smoke guide plate and the smoke collecting hood in the left-right direction, the main air inlet is close to the fan and has strong wind power, the auxiliary air inlet plays a role in preventing smoke leakage (escaping smoke is sucked by the auxiliary air inlet when moving along the two sides of the smoke collecting hood), and the plurality of air inlets (namely the main air inlet and the auxiliary air inlet) are matched to achieve the optimal smoke suction effect; the second smoke guide plate moves forwards, so that the compression on the fan is avoided, the performance of the fan can be fully released, the maximum air quantity is increased, the smoking effect is improved, and the noise of the fan is reduced; 2. the first smoke guide plate is obliquely arranged relative to the second smoke guide plate, and when oil smoke enters the main air inlet and the auxiliary air inlet, the oil smoke enters the upper air inlet of the smoke collecting hood along the inclination angle of the first smoke guide plate, so that the air flow is smoother, and the problem of noise caused by opposite impact when the air flow enters from the main air inlet and the auxiliary air inlet on the two sides is solved; 3. the second smoke guide plate is provided with the concave part, the left side wall and the right side wall of the concave part have a flow guiding effect on the air flow, and the problem that the air flow cannot smoothly enter the air inlet and generate noise due to the fact that two air flows opposite in air inlet direction are prevented from being collided is solved.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the present invention (with the smoke deflector in an open state);

FIG. 2 is a schematic view of the structure of FIG. 1 in another direction;

FIG. 3 is an exploded view of FIG. 1;

FIG. 4 is a schematic view of the drive assembly of FIG. 1 assembled with a smoke collection hood;

FIG. 5 is a schematic structural diagram of the driving device in FIG. 4;

FIG. 6 is a schematic structural view (with the smoke deflector in a closed state) of an embodiment of the present invention;

fig. 7 is a schematic structural view of the smoke guide plate in fig. 6.

Detailed Description

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

As shown in fig. 1 to 7, the range hood of the preferred embodiment includes a housing, a smoke collecting hood 1 provided with an air inlet 11, and a fan system, wherein the smoke collecting hood 1 is disposed at the front portion of the housing, the fan system is disposed in the housing, and the air inlet 11 is communicated with the fan system.

The front side of the smoke collecting hood 1 is provided with a smoke guide plate 2 which moves or deflects relative to the smoke collecting hood 1 under the action of a driving mechanism to open and close the air inlet 11, the smoke guide plate 2 comprises two first smoke guide plates 21 which are respectively positioned at the left side and the right side and a second smoke guide plate 22 which is positioned between the two first smoke guide plates 21, and the width of the first smoke guide plate 21 in the left-right direction accounts for 0.5-0.8, preferably 0.6 of the width of the second smoke guide plate 22 in the left-right direction.

The driving mechanism drives the first smoke guide plate 21 to deflect and drives the second smoke guide plate 22 to extend forwards or return backwards, so that a main air inlet 23 is formed between the second smoke guide plate 22 and the adjacent first smoke guide plate 21, and an auxiliary air inlet 24 is formed between the first smoke guide plate 21 and the smoke collecting cover 1.

In other words, in the open state of the air inlet 11, the second smoke guide plate 22 is located at the front side of the first smoke guide plate 21, the side of the first smoke guide plate 21 adjacent to the second smoke guide plate 22 in the left-right direction is located at the rear side of the side away from the second smoke guide plate 22, the second smoke guide plate 22 forms the main air inlet 23 between the adjacent first smoke guide plate 21 in the left-right direction, and the first smoke guide plate 21 forms the auxiliary air inlet 24 between the smoke collecting hood 1 in the left-right direction. During smoking, oil smoke firstly collides with the two first smoke guide plates 21 and enters the main air inlet 23, the wind power of the main air inlet 23 close to the fan is strong, the escaped oil smoke is sucked by the auxiliary air inlet 24 when moving along the two sides of the smoke collecting cover 1 so as to prevent the oil smoke from leaking, and the plurality of air inlets (namely the main air inlet 23 and the auxiliary air inlet 24) are matched to achieve the optimal oil smoke suction effect; and the second smoke deflector 22 moves forward, so that the oppression to the fan is avoided, the performance of the fan can be fully released, the maximum air quantity is increased, the smoking effect is improved, and the noise of the fan is reduced.

The main air inlet 23 is formed by driving the second smoke guide plate 22 to extend forwards or/and driving the first smoke guide plate 21 to deflect by a driving mechanism; wherein the auxiliary air inlet 24 is formed by driving the first smoke guide plate 21 to deflect or/and extend forwards by the driving mechanism. That is, the first smoke guide plate 21 and the second smoke guide plate 22 may be driven by a driving mechanism, respectively, or the first smoke guide plate 21 may serve as a driving plate, the second smoke guide plate 22 may serve as a driven plate linked with the first smoke guide plate 21, or the second smoke guide plate 22 may serve as a driving plate, and the first smoke guide plate 21 may serve as a driven plate linked with the second smoke guide plate 22.

In this embodiment, the second smoke guide plate 22 serves as a driving plate, and the first smoke guide plate 21 serves as a driven plate which is linked with the second smoke guide plate 22. The driving mechanism comprises a driving device 3 and a linkage mechanism 4 arranged between the second smoke guide plate 22 and the first smoke guide plate 21 linked with the second smoke guide plate, the linkage mechanism 4 comprises a first mounting seat 41, a connecting rod 42 and a second mounting seat 43, the first mounting seat 41 is arranged on the front end face of the first smoke guide plate 21, the second mounting seat 43 is arranged on the back of the second smoke guide plate 22, the first mounting seat 41 and the second mounting seat 43 are respectively adjacent to two adjacent side edges of the first smoke guide plate 21 and the second smoke guide plate 22, the connecting rod 42 extends in the left-right direction, the first end of the connecting rod 42 is rotatably arranged on the first mounting seat 41, the second end of the connecting rod 42 is rotatably arranged on the second mounting seat 43, and the connecting rod 42 swings back and forth relative to the second smoke guide plate 22 in a moving state of the second smoke guide plate 22.

The driving device 3 comprises a motor 31 and a transmission mechanism connected with the output end of the motor 31 and used for driving the second smoke guide plate 22 to move back and forth, the transmission mechanism comprises a screw rod 32, the motor 31, a connecting piece 34 and a push rod 35, a fixing frame 36 is arranged at the back of the smoke collecting cover 1, the motor 31 is fixedly arranged on the fixing frame 36, the screw rod 32 is driven by the motor 31 and extends along the front and back direction, the connecting piece 34 is in threaded connection with the screw rod 32, the push rod 35 extends along the front and back direction, one end of the connecting piece is connected with the connecting piece 34, the other end of the connecting piece penetrates through the fixing frame 36 to be connected with a connecting block. The motor 31 drives the screw rod 32 to rotate, and when the screw rod 32 rotates, the connecting piece 34 moves back and forth on the screw rod 32 to drive the push rod 35 to move back and forth, so as to push the second smoke guide plate 22 to move back and forth.

Be equipped with support 13 on the collection petticoat pipe 1, it is equipped with pivot 12 to rotate on the support 13, and this pivot 12 is close to the side setting of the first smoke deflector 21 adjacent with second smoke deflector 22 to extend along the side length direction of aforementioned first smoke deflector 21, and the back of first smoke deflector 21 is equipped with third mount pad 215, and this third mount pad 215 rotates with pivot 12 to be connected to carry on spacingly to the orbit that deflects of first smoke deflector 21, prevent that first smoke deflector 21 from taking place the slope when deflecting.

The plane of the first smoke guide plate 21 in the open state has an angle of 8 ° to 12 °, preferably 10 °, with respect to the plane of the first smoke guide plate 21 in the closed state.

In the closed state of the smoke guide plate 2, the second smoke guide plate 22 and the two first smoke guide plates 21 are inclined gradually backward from top to bottom and cover the front side of the plane of the air inlet 11. And smoke deflector 2 has certain interval between left and right direction and collection petticoat pipe 1, and this interval is not less than 3mm, prevents to produce between smoke deflector 2 and the collection petticoat pipe 1 and interferes.

Because the airflow flowing directions entering the two main air inlets 23 are opposite, in order to prevent the airflows entering the two main air inlets 23 from generating opposite impacts, the central portion of the second smoke guide plate 22 is recessed backwards to form a recessed portion 25, and the recessed portion 25 comprises a left side wall 251, a right side wall 252 and a top wall 253 connecting the left side wall 251 and the right side wall 252, which are respectively located on the left side and the right side, the left side wall 251 is inclined from front to back to right, the included angle between the left side wall 251 and the top wall 253 is 5-10 degrees, the right side wall 252 is inclined from front to back to left, and the included angle between the right side wall 252 and the top wall 253 is 5-10 degrees. Therefore, the left side wall 251 and the right side wall 252 guide the entering airflow, and the airflow is smoothly guided into the air inlet 11 on the fume collecting hood 1, so that the problems that the airflow cannot be smoothly sucked and noise is caused due to opposite impact of the airflow at two sides are avoided.

In addition, the smoke guide plate structure of the embodiment of the invention is not limited to be applied to the side-draft range hood, but also can be applied to the top-draft range hood, and only the structure of the smoke guide plate has better smoke guide effect when being applied to the side-draft range hood; for the top-suction type range hood, the oil smoke is lifted to the smoke guide plate and is quickly sucked into the air inlet, and the flow guide process is short.

Claims

1. A range hood comprises a fume collecting hood (1) provided with an air inlet (11), wherein a fume guide plate (2) which can move or deflect relative to the fume collecting hood (1) under the driving of a driving mechanism to enable the air inlet (11) to be opened and closed is arranged on the front side of the fume collecting hood (1), and the fume guide plate (2) comprises two first fume guide plates (21) which are respectively positioned on the left side and the right side and a second fume guide plate (22) which is positioned between the two first fume guide plates (21);

the method is characterized in that: air intake (11) be in under the open mode, second smoke deflector (22) are located first smoke deflector (21) front side, first smoke deflector (21) are close to the side of second smoke deflector (22) and are located the side rear side of keeping away from second smoke deflector (22) in the left and right direction, second smoke deflector (22) form main air intake (23) between left and right direction and adjacent first smoke deflector (21), first smoke deflector (21) form supplementary air intake (24) between left and right direction and collection petticoat pipe (1).

2. The range hood of claim 1, wherein: the central part of the second smoke guide plate (22) is recessed backwards to form a recessed part (25), the recessed part (25) is provided with a left side wall (251) and a right side wall (252) and a top wall (253) connecting the left side wall and the right side wall, the left side wall (251) is inclined from front to back to right, and the right side wall (252) is inclined from front to back to left.

3. The range hood of claim 2, wherein: the included angle between the left side wall (251) and the top wall (253) is 5-10 degrees, and the included angle between the right side wall (252) and the top wall (253) is 5-10 degrees.

4. The range hood of claim 1, wherein: the plane of the first smoke guide plate (21) in the opening state has an included angle of 8-12 degrees relative to the plane of the first smoke guide plate (21) in the closing state.

5. The range hood according to any one of claims 1 to 4, wherein: the main air inlet (23) is formed by driving the second smoke guide plate (22) to extend forwards or/and driving the first smoke guide plate (21) to deflect by the driving mechanism.

6. The range hood of claim 5, wherein: the auxiliary air inlet (24) is formed by driving the first smoke guide plate (21) to deflect or/and extend forwards through the driving mechanism.

7. The range hood of claim 6, wherein: the driving mechanism comprises a driving device (3) and a linkage mechanism (4) arranged between the second smoke guide plate (22) and the first smoke guide plate (21) linked with the second smoke guide plate (22), and the driving device (3) is connected with the second smoke guide plate (22) in a driving mode.

8. The range hood of claim 7, wherein: link gear (4) include first mount pad (41), connecting rod (42) and second mount pad (43), terminal surface before first smoke deflector (21) is located in first mount pad (41), second smoke deflector (22) back is located in second mount pad (43), and first mount pad (41) and second mount pad (43) are close to first smoke deflector (21) and the adjacent both sides limit setting of second smoke deflector (22) respectively, connecting rod (42) extend along left right direction, and the first end rotation of connecting rod (42) is installed on first mount pad (41), and the second end rotation of connecting rod (42) is installed on second mount pad (43), relative second smoke deflector (22) swing back and forth in connecting rod (42) under the state that second smoke deflector (22) removed.

9. The range hood of claim 8, wherein: the rotary smoke collecting hood is provided with a rotary shaft (12) in a rotating mode, the rotary shaft (12) is adjacent to the side edge of a first smoke guide plate (21) adjacent to a second smoke guide plate (22) and extends along the length direction of the side edge of the first smoke guide plate (21), and the back of the first smoke guide plate (21) is connected with the rotary shaft (12) in a rotating mode.

10. The range hood of claim 7, wherein: the driving device (3) comprises a motor (31) and a transmission mechanism which is connected with the output end of the motor (31) and used for driving the second smoke guide plate (22) to move back and forth, and the driving end of the transmission mechanism is connected with the second smoke guide plate (22).

11. The range hood of claim 10, wherein: drive mechanism includes lead screw (32), connecting piece (34) and push rod (35), lead screw (32) are driven by motor (31) and extend along the fore-and-aft direction, connecting piece (34) threaded connection is on lead screw (32), push rod (35) extend along the fore-and-aft direction, and one end is connected with connecting piece (34), and the other end is connected with second smoke deflector (22).

12. The range hood of claim 11, wherein: the motor (31) is fixedly arranged on a fixed frame (36), the fixed frame (36) is fixedly arranged relative to the smoke collecting cover (1), and the push rod (35) penetrates through the fixed frame (36) to be connected with the second smoke guide plate (22).

13. The range hood of claim 1, wherein: when the smoke guide plate (2) is in a closed state, the second smoke guide plate (22) and the two first smoke guide plates (21) are gradually inclined backwards from top to bottom and cover the front side of the plane where the air inlet (11) is located.

14. The range hood of claim 12, wherein: the smoke guide plate (2) has a certain distance with the smoke collecting hood (1) in the left-right direction.

15. The range hood of claim 1, wherein: the width of the first smoke guide plate (21) in the left-right direction accounts for 0.5-0.8 of the width of the second smoke guide plate (22) in the left-right direction.