CN212618543U

CN212618543U - Fume exhaust fan

Info

Publication number: CN212618543U
Application number: CN202021244323.2U
Authority: CN
Inventors: 鲍宝申; 任树栋; 施旭娜
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-03-27
Filing date: 2020-06-29
Publication date: 2021-02-26
Anticipated expiration: 2030-06-29
Also published as: CN112539428B; CN215259982U; CN111442312B; CN215863589U; CN212618542U; CN112539433A; CN112539434A; CN112539437A; CN212618541U; CN212618544U; CN112539436B; CN112539428A; CN111561721B; CN213237677U; CN112539436A; CN112539429A; CN112539431A; CN112539432A; CN112539430B; CN111442312A

Abstract

The utility model discloses a range hood, including the fan frame, be provided with fan system in the fan frame, fan system includes the spiral case, be formed with the fan air intake on the spiral case, be provided with in the fan frame and be used for falling the sound box of inhaling of making an uproar, its characterized in that: inhale sound box and include the end plate of making an uproar that falls with fan air intake just setting up and incline upwards the kink that extends to the direction of spiral case gradually by the top of end plate. Compared with the prior art, the utility model has the advantages of: the bending part is formed on the sound absorption box, so that the oil smoke rising upwards can be guided to the air inlet of the fan, and the noise caused by turbulent vortex formed in the corner area of the top of the fan frame is avoided.

Description

Fume exhaust fan

Technical Field

The utility model relates to an oil smoke purifier, especially a range hood.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

The common range hood on the market comprises a top suction type range hood and a side suction type range hood, wherein a power source of the side suction type range hood is close to a cooking bench, most of oil smoke close to the cooking bench is sucked away in an arc-shaped mode. The existing side-draft range hood is generally provided with an air inlet on a panel, so that in order to avoid the problem that the air inlet is exposed out and not beautiful enough and oil smoke flows backward when the range hood does not work, the air inlet can be provided with a smoke baffle plate, and the range hood can also play a role of gathering smoke when in work. A side draft range hood as disclosed in chinese patent application No. 201910426080.X, comprising: the fan device is arranged at the top of the smoke collection box, the front side of the smoke collection box is provided with a smoke inlet, the smoke inlet is inclined towards the interior of the smoke collection box from top to bottom, and the bottom of the smoke collection box is provided with an oil cup; the integrated smoke gathering plate is movably arranged at the top of the smoke inlet on the smoke collecting box, and when the integrated smoke gathering plate is in a closed state, the integrated smoke gathering plate completely covers the smoke inlet and the oil cup.

The existing range hood mainly depends on a fan system to collect and discharge oil smoke in the using process, relatively large noise can be generated in the high-speed rotation process of the fan, the generated noise is reflected and diffused outwards from the inner surfaces of the front air inlet end and the rear air inlet end of the fan, and the generated noise is finally discharged from the air inlet of the range hood through the reflection of different end surfaces in the noise propagation process; when the range hood is used by a user, the user experience is seriously influenced by high noise. In addition, the side-draught range hood with the upper fan is characterized in that airflow rises and touches the air outlet plate at a position above an air inlet of the fan system and between the air outlet plate and the side wall (the corner of the top of the fan frame) of the fan frame, and the airflow is diffused in a non-directional manner to the periphery and is easy to generate turbulent flow so as to generate noise.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the not enough of above-mentioned prior art existence, provide a range hood, the turbulent flow swirl in guide fan frame top bight reduces the noise.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a range hood, includes the fan frame, be provided with fan system in the fan frame, fan system includes the spiral case, be formed with the fan air intake on the spiral case, be provided with in the fan frame and be used for falling the sound box of inhaling of making an uproar, its characterized in that: inhale sound box and include the end plate of making an uproar that falls with fan air intake just setting up and incline upwards the kink that extends to the direction of spiral case gradually by the top of end plate.

Preferably, in order to facilitate noise emitted from the end plate in the straight-face fan system with the largest area and improve the noise reduction effect, the bending point of the bending part corresponds to the top of the corresponding fan air inlet.

Preferably, the end plate is provided with a noise reduction hole, and sound absorption cotton is arranged between the end plate and the air frame.

Preferably, the fan system is a double-air-inlet fan, the fan air inlet is provided with two air inlets, one of the two air inlets is a main fan air inlet, the other air inlet is an auxiliary fan air inlet, and the sound-absorbing box comprises a first sound-absorbing box which is over against the main fan air inlet and a second sound-absorbing box which is over against the auxiliary fan air inlet.

Preferably, in order to conveniently dismantle fan system (especially impeller), first sound box of inhaling includes just to the first end plate that the fan air intake set up and the first kink that forms by the top of first end plate to the spiral case direction bending, the second sound box of inhaling includes just to the second end plate that the fan air intake set up and the second kink that forms by the top of second end plate to spiral case direction bending, the range of buckling of second kink is greater than first kink, the top and the fan frame top of second kink are fixed.

Preferably, in order to better guide the flow and improve the noise reduction effect, the included angles between the first bending part and the horizontal direction and the included angles between the second bending part and the horizontal direction are not less than 15 °.

In order to reflect the noise radiated downwards by the fan system, the range hood further comprises a shell, the fan frame is arranged above the shell, an air inlet is formed in the front side of the shell, a lining plate assembly is arranged in the shell, and the lining plate assembly comprises a front lining plate capable of reflecting the noise of the fan system.

Preferably, the inner lining plate assembly further comprises sound absorption cotton arranged on the front side of the front inner lining plate, and the front inner lining plate is provided with noise reduction holes.

In order to further block and reflect the noise radiated downwards by the fan system, an oil guide plate assembly capable of allowing oil smoke to pass through is arranged in the shell, and the oil guide plate assembly comprises a first oil guide plate and a second oil guide plate, wherein the first oil guide plate extends from the front side of the shell and is positioned above the air inlet and gradually inclines downwards backwards and extends downwards, and the second oil guide plate extends downwards and gradually forwards from the rear end of the first oil guide plate; the front lining plate is arranged above the front side of the first oil guide plate, and the front lining plate upwards inclines forwards from the upper part of the first oil guide plate gradually and extends to the top of the shell to be connected with the fan frame.

Furthermore, in order to enable air flow to enter uniformly and reduce noise, a first inlet is formed in the first oil guide plate, a second inlet is formed in the second oil guide plate, and the first oil guide plate and the second oil guide plate are made into a grid net.

Further, for making the air current more stable, flow loss is little, and the air intake fluid is more even, and the noise is lower, the casing front side is provided with lower panel assembly, lower panel assembly can be in the first position of closing the air intake and the second position of opening the air intake, lower panel assembly when being in the second position, be located the place ahead of casing, the space between oil deflector subassembly, casing and the air rack has constituted interior cavity, the space between oil deflector subassembly, casing and the lower panel assembly has constituted the outer cavity that is used for holding together the cigarette.

Compared with the prior art, the utility model has the advantages of: the bending part is formed on the sound absorption box, so that the oil smoke rising upwards can be guided to the air inlet of the fan, and the noise caused by turbulent vortex formed in the corner area of the top of the fan frame is avoided; the front inner lining plate and the oil guide plate assembly are arranged below the fan system, so that the noise radiated downwards by the fan system can be reflected; by forming the cavity with small dynamic pressure and large static pressure and smoke gathering, the air flow can enter more stably, the flow loss is small, the fluid at the air inlet is more uniform, and the noise is lower.

Drawings

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

fig. 2 is a schematic view of an open state of the range hood according to the embodiment of the present invention;

fig. 3 is a side view of the open state of the range hood according to the embodiment of the present invention;

fig. 4 is a sectional view (front-rear section) of the open state of the range hood according to the embodiment of the present invention;

fig. 5 is a schematic diagram of an alternative embodiment of an inner liner assembly of a range hood according to an embodiment of the present invention;

fig. 6 is a sectional view (left-right direction section) of the range hood according to the embodiment of the present invention;

fig. 7 is a schematic view of a sound absorption box and a part of a fan frame of the range hood according to the embodiment of the present invention;

fig. 8 is a side view of a fan system of a range hood according to an embodiment of the present invention.

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 "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the disclosed embodiments of the invention may be oriented in different directions and the directional terms are intended to be illustrative and should not be construed as limiting, such as "upper" and "lower" are not necessarily limited to directions 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 and 2, a range hood is a side-draft range hood, and includes a housing 1, a front side of the housing 1 is open and is gradually inclined backward from top to bottom, and an upper panel 2 and a lower panel assembly 3 are respectively disposed at the open of the housing 1 and from top to bottom. The front side of the shell 1 and the position corresponding to the lower panel assembly 3 form an air inlet 11, and the air inlet 11 is arranged below the upper panel 2. The upper panel 2 and the housing 1 are fixedly disposed, and the lower panel assembly 3 is translatable and rotatable with respect to the housing 1 to open or close the intake vent 11. The casing 1 further comprises side plates 12 positioned on the left side and the right side, and a top back plate 13 arranged between the side plates 12, wherein the top back plate 13 comprises a top plate and a back plate, and the top plate and the back plate can be integrated or can be in a split structure connected together.

Referring to fig. 2 to 4, the lower panel assembly 3 includes a lower panel 31, a first baffle 32, a second baffle 33 and a third baffle 34, the lower panel 31 corresponds to the air inlet 11 in shape and size, the first baffle 32 extends from the bottom of the lower panel 31 to the inside of the housing 1, the second baffle 33 has two baffles and is disposed at two sides of the first baffle 33, the third baffle 33 is connected between the rear sides of the first baffle 32 and the second baffle 33, the first baffle 32, the second baffle 33 and the third baffle 34 form a cover body with a triangular longitudinal section, and the cover body is connected and fixed with the lower panel 31 so that the lower panel assembly 3 forms a relatively closed space. After the lower panel assembly 3 reaches the open state, the angle between the lower panel 31 and the vertical direction is 15 to 20 °, and the lower panel 31 is inclined from top to bottom gradually, and the inclination angle of the lower panel 31 is smaller than that of the upper panel 2. The lower panel 3 assembly can realize the opening and closing of the air inlet 11 through the combination of an electric push rod (or a motor), a hinge and a transmission rod.

A fan frame 4 is arranged above the shell 1, and a fan system 6 is arranged in the fan frame 4, so that the range hood with the upper fan is formed. An oil guide plate assembly 7 is arranged in the shell 1, and an oil cup 8 is arranged at the bottom of the shell 1. The oil guide plate assembly 7 includes a first oil guide plate 71 extending from the lower end of the upper surface plate 2 toward the inside of the casing 1, and preferably gradually inclined downward, and a second oil guide plate 72 extending from the rear end of the first oil guide plate 71 downward, and preferably gradually inclined forward, the lower end of the second oil guide plate 72 extending above the oil cup 8 so as to guide oil droplets into the oil cup 8. The upper end of the oil cup 8 is open, and the front side of the oil cup 8 covers the bottom of the shell 1, so that oil drops in the shell 1 can completely enter the oil cup 8. An oil leakage hole 16 is formed at the bottom of the shell 1 so that oil drops enter the oil cup 8 through the oil leakage hole 16.

The first oil guide plate 71 and the second oil guide plate 72 are preferably integrally formed. An inner lining plate assembly is arranged in the shell 1 and is arranged above the oil guide plate assembly 7. The inner liner plate assembly includes a front inner liner plate 151 disposed above the front side of the first oil guide plate 71, and the front inner liner plate 151 preferably extends upward from above the first oil guide plate 71, gradually inclines forward to the top of the casing 1 to be connected to the fan frame 4. More preferably, the front inner liner plate 151 is parallel to the upper panel 2. The inner liner assembly further includes side inner liner plates 152 respectively provided inside the left and right side plates 12 of the case 1. The two side inner lining plates 152 are inclined from bottom to top towards the middle at the position which is spaced from the oil guide plate assembly 7 upwards by a certain distance, so that the side inner lining plates 152 form a guide plate, and the oil fume flows into the fan frame 4 quickly by utilizing the coanda effect of the guide plate. The space between the oil deflection panel assembly 7, the front inner liner panel 151, the side inner liner panel 152, the top rear panel 13, and the air frame 4 constitutes the inner chamber 142. When the range hood is in an open state, the space among the oil guide plate assembly 7, the side plate 12 and the lower panel assembly 3 forms an outer cavity 141 for collecting smoke. The inner cavity 142 and the outer cavity 141 are both located below the fan system 6. The oil guiding function of the oil guiding plate assembly 7 will be described in detail below.

In the closed state of the range hood, the first baffle 32, the second baffle 33 and the third baffle 34 of the lower panel assembly 3 are just arranged in the outer cavity 141, and the upper panel 2 and the lower panel 31 form a whole large plane, which is the first position of the lower panel assembly 3. When the range hood works and is in an open state, the lower panel assembly 3 can move to the front of the upper panel 2 to open the air inlet 11, and at the moment, a complete outer cavity 141 is formed, and at the moment, the lower panel assembly 3 is in a second position. The first oil guiding plate 71 is provided with a first inlet 711, and the second oil guiding plate 72 is provided with a second inlet 721, wherein the first inlet 711 is a main air inlet, and the second inlet 721 is an auxiliary air inlet. The outer cavity 141 can ensure that smoke can be rapidly collected and collected when the volume of the oil smoke is large, then the oil smoke is sucked from the first inlet 711 and the second inlet 721 on the oil guide plate assembly 7, and the oil smoke passes through the oil guide plate assembly 7 from the outer cavity 141, enters the fan system 6 through the inner cavity 142, and then is discharged outdoors. Preferably, the first inlet 711 and the second inlet 721 are both bar-shaped holes, and are uniformly spaced in the left-right direction, so that the first oil guide plate 71 and the second oil guide plate 72 become a grid net.

As described above, the front inner liner plate 151 is disposed obliquely with respect to the vertical direction and the horizontal direction, and in this embodiment, it is preferable that the front inner liner plate 151 is disposed at an angle of 50 ° with respect to the horizontal direction, in cooperation with the oblique disposition of the oil deflector assembly 7, so that the inner cavity 142 has a substantially conical cavity. The front inner lining plate 151 enables negative pressure in the inner cavity 142 to move outwards, and corresponding inlets on the first oil guide plate 71 and the second oil guide plate 72 are uniformly arranged, so that negative pressure in the outer cavity 141 can be uniform after the negative pressure moves outwards through the oil guide plate assembly 7, and the outer cavity 141 becomes a pressure equalizing cavity. In addition, the air inlet speed of each inlet on the oil guide plate component 7 is uniform, and oil smoke can uniformly enter the fan system 6. The outer cavity 141 is closer to the rising position of cooking food oil smoke, so that the rising oil smoke can be more easily captured, the oil smoke is prevented from escaping, and a user can really feel smokeless cooking in the cooking process.

Because the fan system 6 is arranged on the upper portion, noise generated during operation is reflected and diffused downwards through the fan frame 4 and enters the conical inner cavity 142. Therefore, it is preferable that the front inner liner plate 151 is a noise reduction plate structure. Referring to fig. 5, the inner lining plate assembly further includes a sound absorption cotton 153 disposed at the front side of the front inner lining plate 151, and the noise reduction holes 154 are opened on the front inner lining plate 151, so that the front inner lining plate 15 and the sound absorption cotton 153 form a noise reduction structure capable of reflecting the noise diffused downward in the fan frame 4, and the uniform arrangement of the first inlet 711 and the second inlet 721 of the oil guide plate assembly 7 can block the reflected noise again. According to bernoulli and fluid continuity principle, the inner cavity 142 is located below the fan system 6, the flow speed of the inner fluid is high, the dynamic pressure is high, the static pressure is low, the static pressure of the gas in the pressure equalizing cavity formed by the outer cavity 141 is maximum, the dynamic pressure is minimum, the air flow is more stable, the flow loss is low, the air inlet fluid is more uniform, and the noise is lower.

When the range hood is opened and is in a working state, a certain gap is formed between the lower panel assembly 3 and the upper panel 2, the first baffle 32 of the lower panel assembly 3 gradually inclines upwards from front to back to form a flow guide structure, so that oil smoke below the lower panel assembly 3 can be quickly guided into the outer cavity 141 on the front side of the oil guide panel assembly 7. In order to ensure that the smoke collecting effect and the user experience are optimal, the range hood is installed on the wall, and the distance between the bottom of the lower panel 31 and the wall is 360-380 mm.

Can set up light 36 in the first baffle 32 department of lower plate subassembly 3, install light 36 in this region, avoid the dazzling problem that the user brought is directly penetrated to light, can also shine the whole kitchen mesa of range hood below, promote user's culinary art and experience the effect.

Referring to fig. 6 and 7, because the fan system 6 generates relatively large noise during the high-speed rotation process, the generated noise is reflected and diffused outwards from the front and rear air inlet end faces of the fan system 6, and is finally discharged from the air inlet 11 of the range hood after being reflected by different end faces during the noise propagation process, so that the user experience is seriously influenced by the large noise during use. Above-mentioned preceding welt 151 and inhale the effect of making an uproar of falling that the cooperation of sound cotton 153 played and be not enough to satisfy the demand, for this reason, the utility model discloses still the design has other structures of making an uproar of falling. The fan system 6 includes a volute 61, an impeller 62 disposed within the volute 61, and a motor 63 for driving the impeller 62. The top of the fan frame 4 is provided with an air outlet plate 41. In this embodiment, the fan system 6 is a double-inlet fan, two fan inlets 611 are formed on the volute 61, one of the two fan inlets is a main fan inlet and faces the right side, and the other fan inlet is an auxiliary fan inlet and faces the left side, and the arrangement mode can reduce the escape of oil smoke from the two sides of the housing 1. The direction of the air inlet of the main fan and the direction of the air inlet of the auxiliary fan can be interchanged. The oil smoke enters the fan system 6 from the left and right fan air inlets 611 of the fan system 6, and the noise is reflected and diffused outwards from the left and right fan air inlets 611.

The fan system 6 further includes a first sound absorbing box 64 and a second sound absorbing box 65 which are provided in the fan frame 4 for noise reduction, the first sound absorbing box 64 is fixed to the right side in the fan frame 4, and the second sound absorbing box 65 is fixed to the left side in the fan frame 4. The side surfaces of the first sound absorption box 64 and the second sound absorption box 65 are fixed with the corresponding side surfaces of the fan frame 4 by screws, and the top of the second sound absorption box 65 is fixed with the bottom surface of the air outlet plate 41. The first sound absorbing box 64 is formed with a first end plate 641 which is inclined from top to bottom in a direction away from the scroll casing 61 at a position facing the main blower inlet of the blower system 6, and the second sound absorbing box 65 is formed with a second end plate 651 which is inclined from top to bottom in a direction away from the scroll casing 61 at a position facing the auxiliary blower inlet of the blower system 6. Therefore, the end plates of the two sound absorption boxes are positioned at the opposite positions where the noise source of the fan system 6 is exhausted, and the attenuation effect can be reduced by directly reflecting the noise.

The first end plate 641 and the second end plate 651 are respectively and uniformly provided with a first honeycomb noise reduction hole 642 and a second honeycomb noise reduction hole 652, a first honeycomb sound absorption cotton 643 is arranged between the corresponding inner sides of the first end plate 641 and the air frame 4, namely, the back surface of the first end plate 641 away from the volute 61, and a second honeycomb sound absorption cotton 553 is arranged between the corresponding inner sides of the second end plate 651 and the air frame 4, namely, the back surface of the second end plate 651 away from the volute 61. The back of each end plate is positioned at the first noise reflection end face of the fan system 6, and the design can directly reduce the reflection of noise transmitted from the fan air inlets 611 on the left side and the right side, so that the noise value of the whole machine is effectively reduced. The noise can be reduced by 1.0-1.5 dB on the premise of not influencing the maximum air volume performance of the whole machine.

The fan system 6 is not centrally located within the fan frame 4, but rather the width of the primary air inlet passageway P1 formed between the primary fan inlet and the inside of the side wall of the respective fan frame 4 is greater than the width of the secondary air inlet passageway P2 formed between the secondary fan inlet and the inside of the side wall of the respective fan frame 4. In this embodiment, the width of the main air inlet passage P1 is preferably 110mm, the width of the auxiliary air inlet passage P2 is preferably 91mm, and the included angle between the first end plate 641 and the second end plate 651 with respect to the vertical direction is preferably 6 °, so that the requirement of air inlet area on the left and right sides (air inlet area > outlet area) can be satisfied.

The top end of the first end plate 641 is bent toward the volute 61 to form a first bent portion 644, and the bent portion corresponds to the top of the right fan inlet 611. Preferably, the angle between the first bent portion 644 and the first end plate 641 is 112 °, and the angle between the first bent portion 644 and the horizontal direction is not less than 15 °, and in this embodiment, 16 °. As can be seen from the above, in this embodiment, the right fan air inlet 611 of the fan system 6 is a main air inlet area, and the impeller 62 needs to be detached from the right side, so that the first sound absorption box 64 uses the fixed position of the bottom and the fan frame 4 as a rotation point base point, and will not interfere with the air outlet plate 41, and the minimum distance between the first sound absorption box 64 and the air outlet plate 41 during the rotation process is about 2mm, which is convenient for the maintenance personnel to take down. Fig. 6 shows a rotation path in broken lines when the first sound-absorbing box 64 is detached.

The top end of the second end plate 651 is bent toward the volute 61 to form a second bent portion 654, the top end of the second bent portion 654 is fixed to the air outlet plate 41, the bent point corresponds to the top of the left fan inlet 611, and the bent range of the second bent portion 654 is greater than that of the first bent portion 644. Preferably, the included angle between the second bent portion 654 and the second end plate 651 is 144 °, the included angle with the horizontal direction is not less than 15 °, in this embodiment, 48 °, and noise coming out from the inside of the straight-face scroll 61 in the largest area range is ensured.

A first triangular area Q1 and a second triangular area Q2 are respectively formed between the first bending part 644 and the air frame 4 and between the second bending part 654 and the air frame 4, airflow in the main air inlet area and the auxiliary air inlet area rises to touch the air outlet plate 41 and then diffuses in a non-directional manner around, and turbulent flow is easily generated in the two triangular areas; the setting of two kink can play effectual guide effect, prevents the production of turbulent flow swirl.

Claims

1. The utility model provides a range hood, includes fan frame (4), be provided with fan system (6) in fan frame (4), fan system (6) include spiral case (61), be formed with fan air intake (611) on spiral case (61), be provided with in fan frame (4) and be used for falling the sound box of inhaling of making an uproar, its characterized in that: the sound absorption box comprises a noise reduction end plate which is opposite to the air inlet (611) of the fan and a bending part which gradually inclines and extends upwards from the top of the end plate to the direction of the volute (61).

2. The range hood of claim 1, wherein: the bending point of the bending part corresponds to the top of the corresponding fan air inlet (611).

3. The range hood of claim 1, wherein: the noise reduction hole is formed in the end plate, and sound absorption cotton is arranged between the end plate and the fan frame (4).

4. The range hood of claim 1, wherein: the fan system is a double-air-inlet fan, the fan air inlets (611) are provided with two air inlets, one air inlet is a main fan air inlet, the other air inlet is an auxiliary fan air inlet, and the sound absorption box comprises a first sound absorption box (64) and a second sound absorption box (65), wherein the first sound absorption box is over against the main fan air inlet, and the second sound absorption box is over against the auxiliary fan air inlet.

5. The range hood of claim 4, wherein: the first sound absorption box (64) comprises a first end plate (641) opposite to the fan air inlet (611) and a first bending part (644) formed by bending the top end of the first end plate (641) towards the direction of the volute (61), the second sound absorption box (65) comprises a second end plate (651) opposite to the fan air inlet (611) and a second bending part (654) formed by bending the top end of the second end plate (651) towards the direction of the volute (61), the bending amplitude of the second bending part (654) is larger than that of the first bending part (644), and the top end of the second bending part (654) is fixed with the top of the fan frame (4).

6. The range hood of claim 5, wherein: the included angle between the first bending part (644) and the second bending part (654) and the horizontal direction is not less than 15 degrees.

7. The range hood of claim 1, wherein: the range hood further comprises a shell (1), the fan frame (4) is arranged above the shell, an air inlet (11) is formed in the front side of the shell (1), an inner lining plate assembly is arranged in the shell (1), and the inner lining plate assembly comprises a front inner lining plate (151) capable of reflecting noise of the fan system (6).

8. The range hood of claim 7, wherein: the inner lining plate assembly further comprises sound absorption cotton (153) arranged on the front side of the front inner lining plate (151), and noise reduction holes (154) are formed in the front inner lining plate (151).

9. The range hood of claim 7, wherein: an oil guide plate assembly (7) capable of allowing oil smoke to pass through is arranged in the shell (1), and the oil guide plate assembly (7) comprises a first oil guide plate (71) and a second oil guide plate (72), wherein the first oil guide plate (71) extends from the front side of the shell (1) to the position above the air inlet (11) and gradually inclines downwards backwards, and the second oil guide plate (72) extends from the rear end of the first oil guide plate (71) to the front gradually; the front lining plate (151) is arranged above the front side of the first oil guide plate (71), and the front lining plate (151) extends upwards from the upper part of the first oil guide plate (71) and gradually inclines forwards to the top of the shell (1) to be connected with the fan frame (4).

10. The range hood of claim 9, wherein: a first inlet (711) is formed in the first oil guide plate (71), and a second inlet (721) is formed in the second oil guide plate (72), so that the first oil guide plate (71) and the second oil guide plate (72) form a grid net.

11. The range hood of claim 9, wherein: casing (1) front side is provided with lower panel assembly (3), lower panel assembly (3) can be in the first position of closing air intake (11) and the second position of opening air intake (11), lower panel assembly (3) when being in the second position, be located the place ahead of casing (1), space between oil deflector subassembly (7), casing (1) and fan frame (4) has constituted interior cavity (142), space between oil deflector subassembly (7), casing (1) and lower panel assembly (3) has constituted outer cavity (141) that is used for holding together the cigarette.