CN212157304U - Smoke exhaust ventilator - Google Patents

Abstract

The utility model discloses a range hood, which comprises a casing, a circular duct fan and an oil filter device. The circular duct fan is fixed in the casing and located above the oil filter device, and the air outlet of the circular duct fan faces upwards and the air inlet faces downwards. The oil filter device is arranged in the casing, and the oil filter device includes a plurality of oil filter cartridges, the oil filter cartridges are cone-shaped, the end with a smaller diameter is relatively close to the circular duct fan, and the multiple oil filter cartridges are arranged in an array. The cone-shaped oil filter cylinder is not easy to accumulate oil, which can prevent the air from hitting the wall of the oil filter cylinder vertically, thereby reducing wind resistance and noise, high oil filtering efficiency and energy saving; The tuyere is facing down, the air with oil fume enters the casing from the bottom of the casing, passes through the oil filter device and the circular duct fan, the air flows smoothly in the vertical direction, the smoke exhaust effect is good, energy saving and low noise. The air inlet surface of the casing is provided with an air volume adjustment mechanism, which can concentrate the ventilation according to the position where the oil fume is generated to enhance the effect of exhausting oil fume.

Description

a range hood

technical field

The utility model relates to household appliances, in particular to a range hood.

Background technique

In the prior art, since there are many detours in the pipeline and the wind resistance is large, it is necessary to use a centrifugal fan with a higher power to extract the oil fume in order to obtain a better effect of exhausting the oil fume. But this move increases the power consumption on the one hand, but also increases the fan noise. Due to the limited oil filtering effect of the pre-filtering device in the range hood, the fan impeller is easy to accumulate oil, which further aggravates the noise.

Utility model content

The technical problem to be solved by the utility model is to provide a range hood which can reduce wind resistance and noise.

In order to solve the above technical problems, an embodiment of the present utility model provides a range hood, including a casing, a circular duct fan and an oil filter device;

The circular duct fan is fixed on the casing, a damping cushion is arranged between the two, and the circular duct fan is located above the oil filter device, and the air outlet of the circular duct fan faces upwards. The air inlet is facing down;

The oil filter device is arranged in the housing, and the oil filter device includes a plurality of oil filter cartridges, the oil filter cartridges are cone-shaped, and the end of the oil filter cartridge with a smaller diameter is opposite to the oil filter cartridge with a larger diameter. One end is close to the circular duct fan, and a plurality of the oil filter cartridges are arranged in an array.

Wherein, the oil filter cartridge includes a skeleton and a porous filter material, the porous filter material is in the shape of a cone and is fixed on the skeleton; the skeleton includes a plurality of bone strips, and a plurality of the bone strips surround the oil filter cylinder are arranged along the central axis of the oil filter cartridge, and the bone strips extend along the generatrix of the oil filter cartridge.

Wherein, the oil filter cylinder is one of a conical cylinder, a triangular cone, a square cone, and a polygonal cone.

Wherein, the central axis of the oil filter cartridge is parallel to the central axis of the circular duct fan.

Wherein, an air inlet plate is arranged inside the casing, an air inlet hole is arranged on the air inlet plate, and the oil filter cartridge is fixed at the air inlet hole;

The number of the air inlet holes and the oil filter cartridges is the same, each of the air inlet holes is provided with an air inlet barrel, the oil filter cartridge is fixed on the air inlet holes, and the two are connected in one-to-one correspondence.

Wherein, a bottom shell is fixed on the bottom of the outer shell, and the bottom shell includes a front plate, a back plate and two side plates, and the front plate, the back plate and the two side plates are surrounded by the air inlet plate; The front plate is arranged opposite to the back plate, and the two side plates are arranged opposite to each other;

The air inlet plate is inclined, and the back plate is fixed on the lower end of the air inlet plate,

An oil collecting box is arranged at the bottom end of the back plate, and the oil collecting box is a long strip arranged along the bottom edge of the back plate; an oil drain valve is arranged on the oil collecting box.

Wherein, the air inlet surface of the casing is provided with an air volume adjustment mechanism for adjusting the air inlet area, the air volume adjustment mechanism includes two dampers, the two dampers are arranged in the left and right directions, and the two dampers are respectively movable It is arranged at the air inlet surface to adjust the air inlet area at each of the damper positions respectively.

Wherein, the damper is slidably arranged on the air inlet surface along the left and right directions; or,

The damper is rotatably arranged at the air inlet surface; or;

The damper is a shutter door.

The range hood further includes a controller and a sound sensor, the controller is electrically connected to the sound sensor and the circular duct fan, and the sound sensor is used to collect ambient sound and send it to the a controller, the controller is used to adjust the power of the circular duct fan according to the intensity of the ambient sound, and when the ambient sound intensity received by the controller becomes higher, the controller controls the circular duct fan power increases.

Wherein, the range hood further includes a manual trigger switch and a controller, the manual trigger switch is arranged on the casing and is electrically connected to the controller; when the manual trigger switch is triggered, the controller controls After the power of the circular duct fan increases and runs for a predetermined period of time, the power of the circular duct fan is controlled to return to the state before the manual trigger switch is triggered.

In the range hood provided by the embodiment of the present invention, the cone-shaped oil filter cylinder is not easy to accumulate oil, and the air can be prevented from hitting the cylinder wall of the oil filter cylinder vertically, thereby reducing wind resistance and noise, high efficiency and energy saving; The air outlet of the circular duct fan is upward and the air inlet is downward. The air with oil fume enters the casing from the bottom of the casing, passes through the oil filter device and the circular duct fan, the air flows smoothly in the vertical direction, and the smoke exhaust effect is good. Hence energy saving and low noise.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a three-dimensional schematic diagram of a range hood provided by an embodiment of the present invention;

Fig. 2 is the front structure schematic diagram of the range hood in Fig. 1;

FIG. 3 is a side structural perspective view of the range hood in FIG. 1 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to FIGS. 1 to 3 , a range hood provided by a preferred embodiment of the utility model includes a casing 1, a circular duct fan 2 and an oil filter device 3, and the circular duct fan 2 and the oil filter device 3 are fixed In the housing 1, the circular duct fan 2 allows the air to enter the housing 1, pass through the oil filter device 3, and then discharge the range hood.

The air with oil fume can enter the interior of the range hood from the bottom of the housing 1 . A damping and vibration-absorbing pad (not shown in the figure) is arranged between the casing 1 and the circular duct fan 2, which can inhibit the vibration of the circular duct fan 2 from being transmitted to the casing 1, thereby reducing noise. The oil filter device 3 is arranged in the casing 1, and the oil filter device 3 includes a plurality of oil filter cartridges 30. The oil filter cartridge 30 is in the shape of a conical cylinder. Duct fan 2. The oil filter cylinder 30 is in the shape of a cone, the filtered oil can flow down the cylinder wall, so that it is not easy to accumulate oil; the air enters from the larger diameter end of the oil filter cylinder 30, which can prevent the air from hitting the cylinder wall of the oil filter cylinder 30 vertically. On the top, the smoke exhaust effect is good, the wind resistance is small, so energy saving and low noise.

As shown in FIG. 3 , the circular duct fan 2 is fixed to the casing 1 , and the circular duct fan 2 is located above the oil filter device 3 , and the air outlet of the circular duct fan 2 is upward and the air inlet is downward. The air with oil fume enters the casing 1 from the bottom of the casing 1, passes through the oil filter device 3 and the circular duct fan 2, the air flows smoothly in the vertical direction, the wind resistance is small and the noise is low.

The oil filter cartridge 30 may be in the shape of a conical cylinder, a triangular cone cylinder, a square cone cylinder, a polygonal cone cylinder, or the like. In this embodiment, the oil filter cartridge 30 is in the shape of a conical cylinder.

The oil filter cartridge 30 includes a frame 31 and a porous filter material (not shown). The porous filter material is in the shape of a cone and is fixed on the frame 31 . The porous filter material can form the main shape of the oil filter cartridge 30, and the skeleton 31 is used to fix the porous filter material and can improve the overall structural strength and divert oil.

The use of porous filter material can intercept and filter the oil mist in the air, and the porous filter material can also absorb the noise generated by the range hood, effectively reducing the overall noise of the range hood. The porous filter material can be formed by curling a sheet-like filter material or by splicing multiple pieces of filter material.

The porous filter material can be porous ceramic filter material, sponge, metal porous filter material and the like. The porous filter material can also be formed by stacking a multi-layered mesh structure, and the meshes of the mesh structure are preferably arranged in dislocation to improve the filtering effect. The mesh structure can be metal mesh, fiber mesh, nylon mesh, and the like. In this embodiment, the porous filter material is formed by stacking multiple layers of fiber meshes or nylon meshes. During use, the air passing through the porous filter material can generate static electricity, and the oil mist can be adsorbed on the porous filter material to further improve the filtering effect.

The skeleton 31 can improve the structural strength of the porous filter material, and can play the role of guiding oil. After the oil mist gathers on the porous filter material to form oil, it can smoothly flow to the bottom of the oil filter cartridge 30 along the skeleton 31 . The skeleton 31 can be combined with the conical oil filter cartridge 30 to form various shapes and structures. In this embodiment, the skeleton 31 includes a plurality of skeletons, the plurality of skeletons are arranged around the central axis of the oil filter cylinder 30, and the skeletons extend along the generatrix of the oil filter cylinder 30, that is, the entire skeleton 31 can be shaped like an umbrella rib shape. As yet another embodiment, the skeleton 31 may have a helical cone shape. In order to further improve the strength, the skeleton 31 is a metal skeleton 31 . The bone strip is located on the inner surface of the oil filter cartridge to facilitate the flow of oil. There are multiple oil filter cartridges 30 and are arranged in an array. Using a plurality of oil filter cartridges 30 can increase the contact area between the air and the porous filter material and improve the filtering effect. In this embodiment, the number of the oil filter cartridges 30 is a square number, and the plurality of oil filter cartridges 30 are arranged in a square matrix. More specifically, there are nine oil filter cartridges 30 arranged in a 3×3 square matrix. Of course, in other embodiments, the number of the oil filter cartridges 30 is not limited to this, and the arrangement can also be in a matrix shape, or a multi-layer ring shape.

As shown in FIG. 3 , an air inlet plate 11 is arranged inside the casing 1, an air inlet hole 110 is arranged on the air inlet plate 11, and the oil filter cylinder 30 is fixed at the air inlet hole 110. In this embodiment, the number of the oil filter cartridge 30 and the air inlet hole 110 is the same, and the two are in one-to-one correspondence. The oil filter cartridge 30 is in the shape of a conical cylinder, and the corresponding air inlet hole 110 is in a circular shape.

More specifically, each air inlet hole 110 is provided with an air inlet cylinder 111 , and the oil filter cylinder 30 is fixed to the air inlet hole 110 , and the two are matched in one-to-one correspondence, so as to facilitate the installation and fixation of the plurality of oil filter cylinders 30 . The air inlet duct 111 is arranged coaxially with the oil filter cylinder 30 to ensure that the direction of the airflow will not change when passing through.

The larger diameter section of the oil filter cartridge 30 is sleeved on the outside of the air inlet tube 111 , and a gap is set between the oil filter tube 30 and the air inlet tube 111 , and a gap is also set between the oil filter tube 30 and the air inlet plate 11 . . The use of the air inlet duct 111 facilitates the assembling and positioning between the oil filter cartridge and the air inlet plate, and the oil filter cartridge 30 and the air inlet plate can be connected by screws or by a snap connection. The oil formed on the oil filter cylinder 30 can flow along the outer wall of the air inlet cylinder 30 to the upper surface of the air inlet plate 11 and flow along the air inlet plate 11 . The annular protrusion 111 can be punched and formed during the processing of the air inlet hole 110, so as to facilitate the processing and preparation.

In this embodiment, the central axis of the oil filter cylinder 30 is parallel to the central axis of the circular duct fan 2. When the air passes through the oil filter cylinder 30 and the circular duct fan 2, the wind direction will not change to ensure smooth air flow. Reduce noise. Here, in other embodiments, the central axis of the oil filter cartridge 30 is arranged perpendicular to the air inlet plate 11 , so as to facilitate the processing and shaping of the oil filter cartridge 30 and facilitate the assembly connection with the air inlet plate 11 .

A bottom case 14 is fixed to the bottom of the housing 1. The bottom case 14 includes a front plate 141, a back plate 142 and two side plates 143. The front plate 141 and the back plate 142 are arranged opposite to each other, and the two side plates 143 are arranged opposite to each other. The front plate 141, The back panel 142 and the two side panels 143 surround the air inlet panel 11 to form the air inlet surface at the bottom of the casing 1; the distance between the two side panels 143 gradually decreases from the bottom The side plates 143 are arranged in a trapezoid shape, so as to facilitate the gathering of air and facilitate the entry of air into the range hood.

The air inlet plate 11 is inclined, and the back plate 142 is fixed on the lower end of the air inlet plate 11 to facilitate the flow and collection of the filtered oil. Here, it can be understood that the fact that the air inlet plate 11 is inclined means that an acute angle is formed between the plate surface of the air inlet plate 11 and the vertical direction, and the two are not perpendicular or parallel. One end of the air inlet plate 11 is relatively high and relatively low relative to the other end. The filtered oil fume forms oil dripping from the bottom end of the oil filter cartridge 30 and flows into the oil collecting box 4 along the air inlet plate 11 . An oil collecting box 4 is arranged at the lower end of the air inlet plate 11 , and the oil collecting box 4 is a long strip arranged along the edge of the air inlet plate 11 . The oil collecting box 4 is provided with an oil discharge valve 41 , and the oil in the oil collecting box 4 can be discharged through the oil discharge valve 41 .

As an embodiment, the middle position of the oil collecting box 4 in its own length direction is relatively low relative to both ends, and the oil discharge valve 41 is arranged at the middle position of the oil collecting box 4 in its own length direction, and the oil in the oil collecting box 4 can be The oil is concentrated to the middle position, and the oil can be discharged through the oil discharge valve 41 after a period of accumulation. Here, as another embodiment, one end of the oil collecting box 4 may be lower, and the oil drain valve 41 may be provided at the lower end.

Further, an air volume adjustment mechanism for adjusting the air inlet area is also provided at the air inlet surface of the housing 1 . In this embodiment, as shown in FIG. 2 , the air volume adjustment mechanism includes a baffle 131 and two dampers 132. The baffle 131 is located between the two dampers 132. The two dampers 132 are arranged along the left and right directions, and the two dampers 132 are respectively movably arranged at the air inlet surfaces, so as to adjust the air inlet area at the positions of the dampers 132 respectively. Here, it can be understood that the left-right direction in the present invention refers to the left-right direction when the user normally uses the range hood, that is, the arrangement direction of the two stove positions of the gas stove.

In this embodiment, the air door 13 is slid on the air inlet surface along the left and right directions, and the air door 13 can be slid left and right, and the position of the air inlet and the size of the air inlet area can be adjusted, so as to suck the oil fume away.

Although most household gas stoves have two stoves, only one stove is often used when cooking, and the amount of oil fume produced when cooking is relatively large, and a large amount of air is required to suck up the fume in time, and the other stove is at this time. Or idle, or soup, a small air volume can meet the needs. In this embodiment, by setting the two dampers 132 corresponding to the two stove positions respectively, the damper 132 corresponding to the cooking stove position is moved to the position of the baffle plate 131 during cooking, so that the air inlet surface corresponding to the cooking stove position is opened, and the other air door is opened. 132 and baffle 131 are staggered and arranged to close or reduce the air inlet surface corresponding to another stove position, and the air volume can be concentrated at the corresponding cooking stove position, so that the cooking fumes can be removed in time. The technical solution can make the air volume relatively concentrated by adjusting the damper, so that the low-power circular duct fan can be used to meet the demand, and the noise generated by the range hood can be reduced.

The baffle 131 has a snap end 131a and a rotating end 131b arranged oppositely, the snap end 131a is snap-connected to the air inlet surface, and the rotating end 131b is rotatably connected to the air intake surface, so that the baffle 131 can be turned upside down. In this embodiment, specifically, the snap end 131a is snap-connected to the front plate 141, and the rotating end 131b is pivotally connected to the back plate 141 or the top of the oil collecting box through a hinge.

In normal use, the snap end 131a is connected to the front plate 141. When the internal oil filter device needs to be cleaned, the snap end 131a is separated from the front plate 141, and the baffle plate 131 is turned downward to expose the oil filter device. Therefore, cleaning is facilitated. After the cleaning is completed, the baffle plate is turned upwards, and the snap end 131a is connected with the front plate 141 . In this embodiment, the circular duct fan 2 is fixed in the casing 1 to control the noise in the casing 1. Of course, in other embodiments, the circular duct fan 2 can also be fixed above the casing 1, and the casing 1 only accommodates oil filter 2.

In the above embodiment, the air volume adjustment mechanism includes a baffle 131 and two dampers 132. In other embodiments, no baffles are provided, but only two dampers are provided. When the two dampers are completely dislocated, the air intake area It is the smallest, and the air intake volume is also the smallest. One of the dampers can slide to adjust the overlap area of the two dampers. The larger the overlap area of the two dampers, the larger the air intake area and the air intake volume.

In the above embodiment, the two dampers 132 are slidably arranged. In other embodiments, the two dampers are rotatably arranged at the air inlet surface, and the rotation of the dampers is used to adjust the shielding area of the dampers on the air inlet surface, thereby adjusting the air intake area , so as to achieve the purpose of adjusting the air intake. The rotary shaft of the damper can be set at the connection between the damper and the back plate 141 or the oil collecting box, and can also be set at the middle position of the damper in the left and right direction, or the middle position in the front and rear directions of the damper, or the rotary shaft is set at the edge position of the damper in the left and right direction, It can make the damper rotate to achieve the purpose of adjusting the air intake. As another embodiment, the damper can be a shutter door, and each blade of the damper can be rotated, and the purpose of controlling the air intake is achieved by the rotation of the plurality of blades on the shutter door.

As another embodiment, the two side panels 143 are arranged in a trapezoid shape, so that the bottom case is shaped like a trumpet, and the damper can be slid along the air intake direction. The gap between them is gradually reduced, which can reduce the air intake volume. When the air door moves away from the circular duct fan, the distance between the air door and the side plate increases, which can increase the air intake volume.

In the present invention, the range hood also includes a controller (not shown in the figure) and a sound sensor 5, the controller is electrically connected to the sound sensor 5 and the circular duct fan 2, and the sound sensor 5 is used to collect ambient sound And sent to the controller, the controller is used to adjust the power of the circular duct fan 2 according to the intensity of the ambient sound, when the ambient sound intensity received by the controller becomes higher, the controller controls the power of the circular duct fan 2 to increase. The specific positions of the controller and the sound sensor 5 can be set as required, which are not specifically limited in this embodiment. Preferably, the housing 1 has a front panel 12 , and the sound sensor 5 is arranged on the front panel 12 . It can be understood that the front panel 12 is a panel facing the user, and is usually provided with buttons such as a main switch and a light switch. The sound sensor 5 is arranged on the front panel 12 to prevent oil mist from polluting the sound sensor 5 and ensure the accuracy of sensing. More specifically, the front panel 12 and the front panel 141 are fixedly connected, and a space for accommodating circuit devices such as switches is formed therebetween.

When cooking, the moment the material is put into the frying pan, and the frying, etc., there will be a louder sound, and at the same time, the amount of oil smoke will increase. The controller controls the circular duct fan 2 to increase the power after judging the user's action of putting the material into the oil pan, as well as the high-volume action such as frying Fume hazard. When the sound is low, the controller can reduce the power of the circular duct fan 2 to reduce energy consumption.

As an embodiment, the range hood further includes a manual trigger switch and a controller. The manual trigger switch is arranged on the housing and is electrically connected to the controller. When the manual trigger switch is triggered, the controller controls the power of the circular duct fan. After becoming larger and running for a predetermined period of time, the power of the circular duct fan is controlled to return to the state before the manual trigger switch is triggered. When the user is cooking, the amount of oily fume is relatively large for a period of time after the dishes are put into the oil pan. Then put in the dishes, so that the fumes can be removed in time.

The range hood provided by the utility model has the following beneficial effects:

1. Since the end of the oil filter cartridge with the smaller diameter is set upward, the air outlet of the circular duct fan is upward and the air inlet is downward, and the air flows vertically and linearly inside the range hood, which can reduce wind resistance and noise; and The oil filter cartridge 30 is in the shape of a cone, which can further reduce wind resistance and noise. The oil filter cartridge 30 adopts porous filter material, which can not only filter oil fume, but also absorb noise, thereby reducing the noise of the entire range hood. The noise of the entire range hood is about 62-66dB(A) at the human ear, which is approximately equivalent to the noise of a floor fan; it is soft and easy to accept. However, the noise of the range hoods currently on the market is about 72-78dB(A), which is uncomfortable or even uncomfortable.

2. Using the cooperation of the controller and the sound sensor 5, it can automatically adjust the exhaust air volume according to the cooking fumes situation, completely eliminate the hazard of the fumes, even if the chili peppers and fried sea fish are fried, the fumes will not be smelled, and the heat of the furnace can be shielded. .

3. The oil filter cartridge 30 adopts porous filter material, which can effectively filter the oil fume, and can purify and recover 80-90% of the oil fume for environmental protection. % soot.

4. Because the power of the circular duct fan 2 can be automatically adjusted in real time, and the oil fume filtration efficiency is high, it can save energy, and its energy consumption is about 35-46% of the range hood on the market.

5. The waste oil is collected by the oil collecting box 4, which is convenient for cleaning and maintenance, and the shape of the whole machine does not hinder the cooking operation.

6. The production cost is comparable to the current high-end range hood, and the installation difficulty is comparable.

The above embodiments do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements and improvements made within the spirit and principles of the above-mentioned embodiments shall be included within the protection scope of this technical solution.

Claims (10)

1. A smoke exhaust ventilator is characterized by comprising a shell, a circular pipeline fan and an oil filtering device;

the circular pipeline fan is fixed on the shell, a damping cushion is arranged between the circular pipeline fan and the shell, the circular pipeline fan is positioned above the oil filtering device, and an air outlet of the circular pipeline fan faces upwards and an air inlet of the circular pipeline fan faces downwards;

the oil filtering device is arranged in the shell and comprises a plurality of oil filtering cylinders, the oil filtering cylinders are in a cone-cylinder shape, one end with a smaller diameter of each oil filtering cylinder is close to the circular pipeline fan relative to one end with a larger diameter of each oil filtering cylinder, and the oil filtering cylinders are arranged in an array mode.

2. The range hood of claim 1, wherein the oil filter cartridge comprises a framework and a porous filter material, wherein the porous filter material is in a cone shape and is fixed on the framework; the skeleton includes many bone strips, many the bone strip encircles the central axis of oil filter and arranges, just the bone strip is followed the generating line of oil filter extends.

3. The range hood of claim 1, wherein the oil filter cartridge is one of a conical cartridge, a triangular conical cartridge, a square conical cartridge, and a polygonal conical cartridge.

4. The range hood of claim 1, wherein the central axis of the oil filter cylinder is parallel to the central axis of the circular duct fan.

5. The range hood of claim 1, wherein an air inlet plate is arranged in the housing, an air inlet hole is formed in the air inlet plate, and the oil filter cylinder is fixed at the air inlet hole;

the number of the air inlet holes is the same as that of the oil filter cylinders, the air inlet cylinders are arranged at the air inlet holes, the oil filter cylinders are fixed at the air inlet holes and are connected in a one-to-one correspondence mode.

6. The range hood of claim 5, wherein a bottom shell is fixed to the bottom of the housing, the bottom shell comprises a front plate, a back plate and two side plates, and the front plate, the back plate and the two side plates are enclosed around the air inlet plate; the front plate and the back plate are oppositely arranged, and the two side plates are oppositely arranged;

the air inlet plate is inclined, the back plate is fixed at the lower end of the air inlet plate,

an oil collecting box is arranged at the bottom end of the back plate and is in a long strip shape arranged along the bottom edge of the back plate; an oil discharge valve is arranged on the oil collecting box.

7. The range hood of claim 1, wherein an air volume adjusting mechanism for adjusting the air volume is disposed at the air inlet surface of the housing, the air volume adjusting mechanism comprises two air doors, the two air doors are arranged along the left-right direction, and the two air doors are respectively movably disposed at the air inlet surface to respectively adjust the air volume at the positions of the air doors.

8. The range hood of claim 7, wherein the damper is slidably disposed on the air inlet surface in a left-right direction; or,

the air door is rotatably arranged at the air inlet surface; or;

the air door is a louver door.

9. The range hood of claim 1, further comprising a controller and a sound sensor, wherein the controller is electrically connected to the sound sensor and the circular duct fan, the sound sensor is configured to collect an ambient sound and send the ambient sound to the controller, the controller is configured to adjust the power of the circular duct fan according to the intensity of the ambient sound, and when the intensity of the ambient sound received by the controller becomes higher, the controller controls the power of the circular duct fan to become higher.

10. The range hood of claim 1, further comprising a manual trigger switch disposed on the housing and electrically connected to the controller; when the manual trigger switch is triggered, the controller controls the power of the circular pipeline fan to be increased and operates for a preset time, and then controls the power of the circular pipeline fan to be restored to the state before the manual trigger switch is triggered.

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