CN219640315U - Fume exhauster - Google Patents

Abstract

The utility model discloses a range hood, relates to the technical field of kitchen equipment, and aims to solve the problem of high noise of the range hood. The range hood comprises a fan assembly, a fume collecting hood assembly, a loudspeaker, a reference microphone and a control circuit system. The inside of the fan component forms an installation cavity and is provided with a smoke outlet and a smoke guide opening which are communicated with the installation cavity. The fume collecting hood assembly is located on one side of the fan assembly and connected with the fan assembly. The fume collecting hood component is provided with a fume inlet which is communicated with the fume guiding opening. The loudspeaker and the reference microphone are arranged in the mounting cavity, and the reference microphone is used for detecting noise in the mounting cavity. The control circuit system is electrically connected with the loudspeaker and the reference microphone and is used for controlling the sound emitted by the loudspeaker according to the noise detected by the reference microphone. The range hood is used for exhausting oil smoke.

Description

Fume exhauster

Technical Field

The utility model relates to the technical field of kitchen equipment, in particular to a range hood.

Background

The kitchen ventilator is a kitchen appliance for purifying kitchen environment, is installed above kitchen range, and can quickly pump away waste gas generated by combustion of kitchen range and oil smoke harmful to human body in cooking process.

The range hood can generate larger noise in the working process. Therefore, in order to reduce noise generated by the range hood, the noise generated by the range hood is generally absorbed by means of passive noise reduction modes such as sound absorption, vibration absorption and pneumatic operation, so that the effect of reducing the noise is achieved.

However, the noise generated by the range hood is large, so that the noise reduction mode cannot achieve a good noise reduction effect, and the range hood still has large noise.

Disclosure of Invention

The utility model provides a range hood, which is used for solving the problem of loud noise of the range hood.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the embodiment of the utility model provides a range hood, which comprises a fan assembly, a fume collecting hood assembly, a loudspeaker, a reference microphone and a control circuit system. The inside of the fan component forms an installation cavity and is provided with a smoke outlet and a smoke guide opening which are communicated with the installation cavity. The fume collecting hood assembly is located on one side of the fan assembly and connected with the fan assembly. The fume collecting hood component is provided with a fume inlet which is communicated with the fume guiding opening. The loudspeaker and the reference microphone are arranged in the mounting cavity, and the reference microphone is used for detecting noise in the mounting cavity. The control circuit system is electrically connected with the loudspeaker and the reference microphone and is used for controlling the sound emitted by the loudspeaker according to the noise detected by the reference microphone.

According to the range hood provided by the embodiment of the utility model, as the smoke guide port of the fan assembly is communicated with the smoke inlet of the smoke collecting hood assembly, when the range hood is used, oil smoke enters the mounting cavity of the fan assembly from the smoke inlet of the smoke collecting hood assembly under the action of the fan assembly, and is finally discharged from the smoke outlet. Because the control circuit system is electrically connected with the loudspeaker and the reference microphone, the noise detected by the reference microphone can be converted into a digital signal to be transmitted to the control circuit system, the control circuit system can control the loudspeaker to emit sound according to the received signal, and the opposite phase noise with corresponding degree is generated, so that the energy of the noise after cancellation is ensured to be less, and finally, the operation noise of the range hood is enabled to be smaller.

In some embodiments, the range hood further comprises an error microphone. The error microphone is arranged in the mounting cavity and is electrically connected with the control circuit system. The error microphone is used to monitor the noise reduction effect in the mounting cavity. The control circuit system is also used for adjusting the sound emitted by the loudspeaker according to the noise reduction effect monitored by the error microphone.

In some embodiments, the fan assembly includes a rack and a fan. The inside of the frame forms an installation cavity and is provided with a smoke outlet and a smoke guide opening. The fan is arranged in the mounting cavity and is provided with an air inlet and an air outlet. The air outlet is connected with the smoke outlet. The error microphone is positioned between the air inlet and the smoke guide port, and the reference microphone is arranged opposite to the air inlet.

In some embodiments, the range hood further comprises a noise reduction assembly. The noise reduction assembly is arranged on the frame and is arranged opposite to the air inlet and used for absorbing noise generated in the installation cavity.

In some embodiments, the noise reduction assembly includes a noise reduction plate and noise reduction cotton. The noise reduction plate is arranged on the frame and is opposite to the air inlet. The noise reduction plate is provided with a containing cavity, and the surface of the noise reduction plate, which is close to one side of the air inlet, is provided with noise reduction holes. The noise reduction cotton is filled in the accommodating cavity and used for absorbing noise generated in the mounting cavity.

In some embodiments, the surface of the noise reduction plate near the side of the air inlet is beveled. Along the direction of keeping away from first smoke guide mouth, the surface of the board of making an uproar that falls is close to air intake one side is close to the air intake gradually.

In some embodiments, the noise reduction assembly further comprises a baffle. The guide plate is positioned on one side of the noise reduction plate close to the smoke inlet, the first end of the guide plate is connected with the frame, and the other end of the guide plate is connected with the noise reduction plate. The air inlet is formed in the air inlet, and the air inlet is formed in the air inlet.

In some embodiments, the control circuitry is located on a side of the fan assembly where the exhaust port is located and on a side of the exhaust port, and is coupled to the fan assembly.

In some embodiments, the speaker is disposed proximate the smoke port.

In some embodiments, the number of speakers is a plurality, the plurality of speakers being spaced apart.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a range hood according to an embodiment of the present utility model;

fig. 2 is a schematic view of the range hood of fig. 1 at another angle;

FIG. 3 is a cross-sectional view of the range hood of FIG. 1 from a side view;

fig. 4 is a cross-sectional view of the range hood shown in fig. 1 at a front view angle;

FIG. 5 is a logical block diagram of the noise reduction principle;

fig. 6 is a schematic diagram of the overall structure of a volute according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of an overall structure of a noise reduction assembly according to an embodiment of the present utility model;

FIG. 8 is a schematic view of the overall structure of the noise reduction plate of FIG. 7;

FIG. 9 is a schematic view of the overall structure of the noise reduction assembly of FIG. 3;

fig. 10 is a partial enlarged view at a in fig. 3.

Reference numerals:

100-range hood; 10-a fan assembly; 101-a mounting cavity; 11-a frame; 12-a fan; 121-a volute; 1211-an air inlet; 1212-air outlet; 1213-a primary air intake; 1214-auxiliary air inlet; 122-fans; 102-a smoke outlet; 20-a fume collection hood assembly; 201-a smoke inlet; 21-a fume collecting hood; 22-a filter screen; 23-an oil guide plate; 24-oil cup; 30-a speaker; 40-a reference microphone; 50-control circuitry; 60-error microphone; 70-a noise reduction assembly; 71-a noise reduction plate; 711-receiving cavity; 712-noise reduction holes; 72-noise reduction cotton; 73-deflector.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "center", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In embodiments of the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In embodiments of the utility model, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment of the present utility model is not to be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

An embodiment of the present utility model provides a range hood, as shown in fig. 1, fig. 1 is a schematic diagram of an overall structure of a range hood 100 according to an embodiment of the present utility model, where the range hood 100 may include a fan assembly 10 and a smoke collecting hood assembly 20.

The fan assembly 10 has a mounting cavity 101 formed therein, and a smoke outlet 102 and a smoke guide opening (not shown) which are communicated with the mounting cavity 101 are formed therein, and the smoke collecting hood assembly 20 is positioned at one side of the fan assembly 10 and connected with the fan assembly 10.

As shown in fig. 2, fig. 2 is a schematic structural view of the range hood 100 shown in fig. 1 at another angle, and the fume collecting hood assembly 20 is provided with a fume inlet 201, where the fume inlet 201 communicates with a fume guiding port (not shown in the figure). Thus, when the range hood 100 is in use, the smoke enters the mounting cavity 101 (fig. 1) of the fan assembly 10 from the smoke inlet 201 of the smoke collecting hood assembly 20 under the action of the fan assembly 10, and finally is discharged from the smoke outlet 102 (fig. 1).

As shown in fig. 2, the fume collecting hood assembly 20 may include a fume collecting hood 21, a filter 22, an oil guiding plate 23 and an oil cup 24, where the fume collecting hood 21 is provided with the fume inlet 201. The filter screen 22 is disposed at the smoke inlet 201. In this way, foreign objects from the outside do not easily enter the inside of the air guide assembly 10 through the smoke inlet 201.

The oil guide plate 23 is disposed on a side of the fume collecting hood 21 away from the fan assembly 10, opposite to the fume inlet 201. It will be appreciated that the oil deflector 23 is located below the hood 21 when the range hood 100 is in use. Thus, when oil drops flow out from the upper smoke inlet 201, the oil drops fall on the oil guide plate 23 and cannot directly fall into the kitchen ware below.

As shown in fig. 2, in order to collect oil soot, an oil cup 24 may be provided at one side of the oil guide plate 23. Therefore, the oil drops on the oil guide plate 23 can fall into the oil cup 24, so that the oil drops on the oil guide plate 23 are prevented from flowing out, and the oil drops are conveniently collected.

In order to reduce noise generated during operation of the range hood 100, as shown in fig. 3, fig. 3 is a cross-sectional view of the range hood shown in fig. 1 at a side view, the range hood 100 may further include a speaker 30, a reference microphone 40, and control circuitry 50. Wherein the speaker 30 and the reference microphone 40 are arranged in the mounting cavity 101.

The speaker 30 may emit sound to generate anti-phase noise to cancel the source noise. The energy of the noise after the cancellation is reduced, thereby reducing the noise when the range hood 100 is operated. The reference microphone 40 may be used to detect noise within the mounting cavity 101. Thus, the magnitude of noise in the mounting chamber 101 can be detected by the reference microphone 40.

The control circuitry 50 is electrically connected to the speaker 30 and the reference microphone 40 for controlling the amount of sound emitted by the speaker 30 based on the noise detected by the reference microphone 40. Therefore, the noise detected by the reference microphone 40 can be converted into a digital signal and transmitted to the control circuit system 50, the control circuit system 50 can control the loudspeaker 30 to emit sound according to the received signal, and generate opposite-phase noise with corresponding degree, so that less energy of the noise after cancellation is ensured, and finally, the operation noise of the range hood 100 is smaller.

In order to keep the noise of the extractor hood 100 low during operation, in some embodiments, as shown in fig. 4, fig. 4 is a cross-sectional view of the extractor hood 100 of fig. 1 at a front view, and the extractor hood 100 may further include an error microphone 60. Error microphone 60 is disposed within mounting cavity 101 and is electrically connected to control circuitry 50. The error microphone 60 may be used to monitor the noise reduction in the mounting cavity 101.

The control circuitry 50 may also be configured to adjust the size of the sound emitted by the speaker 30 based on the noise reduction monitored by the error microphone 60. Thus, the error microphone 60 can convert the noise reduction effect monitored in the mounting cavity 101 into a digital signal and transmit the digital signal to the control circuit system 50, and the control circuit system 50 can adjust the sound size emitted by the speaker 30 according to the received digital signal, so that the noise energy after the anti-phase noise emitted by the speaker 30 is abutted to the source noise is smaller, and the running noise is smaller.

As shown in fig. 5, fig. 5 is a logical block diagram of the noise reduction principle, noise generated by a noise field inside the installation cavity is detected by the reference microphone 40, and the reference microphone 40 transfers the detected noise to the control circuitry 50. The control circuitry 50 may control the magnitude of the sound emitted by the speaker 30 based on the received information. After the speaker 30 emits the inverse noise, the noise in the noise field is counteracted, the noise reduction effect is monitored by the error microphone 60, and the noise reduction effect is transmitted to the control circuit system 50, and the control circuit system 50 adjusts the sound size of the speaker 30 according to the result monitored by the error microphone 60.

For example, when the noise reduction effect monitored by the error microphone 60 is poor, the information is transmitted to the control circuit system 50, and the control circuit system 50 can increase the sound size of the speaker 30, so that the anti-phase noise emitted by the speaker 30 can better offset the source noise, and the noise reduction effect is ensured.

When the oil smoke enters the installation cavity 101 from the smoke guide port, a vortex is easily formed at the smoke guide port, and air noise is generated, so that the noise of the range hood 100 is increased. Thus, to better counteract the source noise, in some embodiments, the speaker 30 may be positioned near the smoke port. I.e. as shown in fig. 3, the speaker 30 is disposed within the mounting cavity 101 on a side thereof adjacent to the hood 21. In this way, the noise generated at the smoke guide can be well offset by the anti-phase noise generated from the speaker 30. Of course, the speaker 30 may be disposed at other locations within the mounting cavity 101.

As shown in fig. 4, in some embodiments, the number of speakers 30 may be plural, and the plural speakers 30 may be disposed at intervals. In this way, by the plurality of speakers 30, larger anti-phase noise can be generated, and thus larger source noise can be canceled.

It will be appreciated that the specific number of speakers 30 may be set according to actual requirements. For example, as shown in fig. 4, the number of speakers 30 may be two, and two speakers 30 are provided on opposite sides. Of course, the number of speakers 30 may be greater than two.

As shown in fig. 3, the fan assembly 10 may include a housing 11 and a fan 12. The interior of the housing 11 defines a mounting cavity 101 and defines a smoke outlet 102 (fig. 2) and a smoke guide. The fan 12 is disposed within the mounting cavity 101 and has an air inlet (not shown in fig. 3) and an air outlet (not shown in fig. 3). The air outlet communicates with the exhaust port 102 (fig. 2).

For better detection of noise and monitoring of noise reduction in the mounting cavity 101, in some embodiments, as shown in fig. 4, the error microphone 60 may be located between the air inlet 1211 and the smoke guide (not shown), i.e., the error microphone 60 is located below the air inlet 1211 shown in fig. 3. In this way, the error microphone 60 can monitor the noise reduction effect better. As shown in fig. 4, the fan 12 may include a scroll case 121 and a fan 122 disposed within the scroll case 121, and the error microphone 60 may be disposed on the scroll case 121.

With continued reference to fig. 4, the reference microphone 40 may be disposed opposite the air inlet 1211. The fan 12 is noisier at the air inlet 1211. In this way, when the reference microphone 40 is disposed opposite to the air inlet 1211, the magnitude of the source noise can be detected more accurately, so that the control circuitry 50 can better control the speaker 30 to emit the corresponding inverse noise for cancellation. Wherein, as shown in fig. 3, the reference microphone 40 may be provided on the housing 11.

In some embodiments, as shown in fig. 4, the number of reference microphones 40 may be plural. In this way, the magnitude of the source noise is detected by the plurality of reference microphones 40, which may be better detected for more accurate control of the sound magnitude of the speaker 30 by the control circuitry 50. Illustratively, as shown in fig. 4, two reference microphones 40 are disposed at a distance from each other at the air inlet 1211. Of course, the reference microphone 40 may be one.

Similarly, with continued reference to fig. 4, the number of error microphones 60 may also be plural. In this way, the noise reduction effect is monitored by the plurality of error microphones 60, so that the monitored result is more accurate, so that the sound size of the speaker 30 is more accurately adjusted. For example, the number of error microphones 60 may be two, and the two error microphones 60 may be spaced apart. Of course, the error microphone 60 may be one.

As shown in fig. 6, fig. 6 is a schematic diagram of the overall structure of a volute 121 according to an embodiment of the present utility model, where the volute 121 has an air inlet 1211 and an air outlet 1212. The air intake 1211 may include a primary air intake 1213 and a secondary air intake 1214 that are positioned relative to one another. Illustratively, as shown in FIG. 6, the primary air intake 1213 and the secondary air intake 1214 are oppositely disposed.

Referring to fig. 3, in use, the right side of the range hood 100 is the side facing the user and the left side of the range hood 100 is the side facing away from the user. When the fan 12 shown in fig. 3 includes the volute 121 shown in fig. 6, the main air inlet 1213 of the volute 121 shown in fig. 6 may face to the right in fig. 3, and the auxiliary air inlet 1214 may face to the left in fig. 3, that is, the auxiliary air inlet 1214 and the main air inlet 1213 are respectively on the left and right sides of the fan 12 shown in fig. 3.

Thus, when the range hood 100 is in operation, the cooking fumes may enter the volute 121 from the main air inlet 1213 and the auxiliary air inlet 1214, and be exhausted from the exhaust outlet 102 through the air outlet 1212 by the fan 122. In this way, the smoke exhaust effect of the range hood 100 can be improved and the efficiency of the range hood 100 can be improved by simultaneously feeding air through the main air inlet 1213 and the auxiliary air inlet 1214 of the volute 121.

When the number of reference microphones 40 is plural, if the scroll case 121 has a main inlet 1213 and a sub-inlet 1214, in some embodiments, as shown in fig. 3, a portion of the reference microphones 40 are located on the side of the main inlet 1213 (i.e., on the right side of the fan 12 in fig. 3) opposite to the main inlet 1213. The other reference microphone 40 is located on the side of the secondary intake port 1214 (fig. 6) (i.e., on the left side of the fan 12 in fig. 3) opposite the secondary intake port 1214. Thus, both the noise at the primary air intake 1213 (fig. 6) and the noise at the secondary air intake 1214 (fig. 6) can be detected by the reference microphone 40, with more complete detection of the noise.

To further enhance the noise reduction capability of the extractor hood 100, as shown in FIG. 3, in some embodiments, the extractor hood 100 may further include a noise reduction assembly 70. The noise reduction assembly 70 may be disposed on the frame 11 opposite to the air inlet 1211 (fig. 4), and the noise reduction assembly 70 is used for absorbing noise generated in the installation cavity 101.

Thus, through the speaker 30 and the noise reduction assembly 70, a part of noise of the range hood 100 is counteracted by the anti-phase noise of the speaker 30, and a part of noise is absorbed by the noise reduction assembly 70, so that the noise reduction effect of the range hood 100 is better, and the noise of the range hood 100 is smaller during operation.

It will be appreciated that when the volute 121 shown in fig. 6 is selected, the noise generated is greater due to the greater intake air at the main intake 1213. The noise reduction assembly 70 may be disposed at a side of the main air inlet 1213 of the volute 121, so that the noise reduction assembly 70 may absorb more noise, and a noise reduction effect of the noise reduction assembly 70 is ensured. That is, as shown in FIG. 3, the noise reduction assembly 70 is located on the right side of the fan 12. Meanwhile, as shown in fig. 3, a part of the reference microphone 40 may be disposed on the noise reduction assembly 70.

In some embodiments, as shown in fig. 7, fig. 7 is a schematic diagram illustrating an overall structure of a noise reduction assembly 70 according to an embodiment of the present utility model, where the noise reduction assembly 70 may include a noise reduction plate 71 and noise reduction cotton 72. As shown in fig. 8, fig. 8 is a schematic overall structure of the noise reduction plate 71 in fig. 7, the noise reduction plate 71 is formed with a receiving cavity 711, and noise reduction cotton 72 (fig. 7) is filled in the receiving cavity 711 to absorb noise generated by the mounting cavity 101 (fig. 3).

As shown in fig. 9, fig. 9 is a schematic overall structure of the noise reduction assembly 70 in fig. 3, where the noise reduction plate 71 is disposed on the frame 11 opposite to the air inlet 1211 (fig. 4). The surface of the noise reduction plate 71 near the side of the air inlet 1211 (fig. 4) is provided with noise reduction holes 712. Thus, noise generated from the fan 12 (fig. 3) is absorbed by the noise reduction cotton 72 after passing through the noise reduction hole 712, thereby reducing noise in the range hood 100.

In some embodiments, as shown in fig. 3, the surface of the noise reduction plate 71 near the side of the air intake (i.e., the surface on the left side of the noise reduction plate 71) may be beveled. The surface of the noise reduction plate 71 on the side close to the air inlet is gradually close to the air inlet in the direction away from the smoke guide port (i.e., in the up-down direction shown in fig. 3).

Thus, after the oil smoke enters the installation cavity 101 through the smoke guide opening, the noise reduction plate 71 can play a role in guiding flow, so that the oil smoke can smoothly flow to the air inlet 1211, vortex is not easy to generate in the installation cavity 101, and noise generated by the vortex is reduced.

In some embodiments, as shown in fig. 10, fig. 10 is an enlarged view of a portion of fig. 3 a, the noise reduction assembly 70 may further include a baffle 73. The baffle 73 is located on the side of the noise reduction plate 71 close to the smoke inlet 201 (not shown in the figure), i.e. as shown in fig. 10, the baffle 73 is located below the noise reduction plate 71. The deflector 73 has a first end connected to the frame 11 and a second end connected to the noise reduction plate 71.

As shown in fig. 10, the baffle 73 is disposed obliquely, and a first end of the baffle 73 (a second end opposite to the baffle 73 is close to the smoke guiding opening, i.e., a right end opposite to a left end of the baffle 73 shown in fig. 10 is lower, and the baffle 73 gradually approaches the air inlet along a direction in which the first end of the baffle 73 points to the second end of the baffle 73. As shown in fig. 10, the baffle 73 is inclined toward the upper left corner.

Thus, referring to fig. 10, when the oil smoke reaches the baffle 73 from the lower side, the oil smoke is guided to the upper left side by the baffle 73, so that the oil smoke flows to the left side of the noise reduction plate 71 better, the airflow flows more smoothly, vortex is not easy to generate, and noise generated by the vortex is reduced.

To prevent the control circuitry 50 from being disturbed by the oil smoke, as shown in fig. 1, in some embodiments, the control circuitry 50 may be located on a side of the fan assembly 10 where the smoke outlet 102 is located, and on a side of the smoke outlet 102, and connected to the fan assembly 10.

It will be appreciated that in practice, the exhaust port 102 is typically connected to an exhaust line and is vented directly from the connection line to the outside. Because the control circuit system 50 is located at one side of the smoke outlet 102, the smoke can be directly discharged through the smoke outlet 102, and the smoke can not pass through the control circuit system 50, so that the control circuit system 50 is prevented from being interfered by the smoke.

Of course, the control circuitry 50 may be located elsewhere. For example, the control circuitry 50 may also be disposed within the mounting cavity 101. When the control circuit system 50 is disposed in the installation cavity 101, in order to avoid the control circuit system 50 from being interfered by the oil smoke, the installation cavity 101 may be provided with an isolation box, and the control circuit system 50 is isolated and disposed in the isolation box.

The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any changes or substitutions within the technical scope of the present utility model should be covered by the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims (10)

1. A range hood, comprising:

the fan assembly is internally provided with an installation cavity and is provided with a smoke outlet and a smoke guide opening which are communicated with the installation cavity;

the fume collecting hood assembly is positioned at one side of the fan assembly and is connected with the fan assembly; the smoke collecting cover component is provided with a smoke inlet; the smoke inlet is communicated with the smoke guide opening;

the loudspeaker is arranged in the mounting cavity;

the reference microphone is arranged in the mounting cavity and used for detecting noise in the mounting cavity; the method comprises the steps of,

and the control circuit system is electrically connected with the loudspeaker and the reference microphone and is used for controlling the sound emitted by the loudspeaker according to the noise detected by the reference microphone.

2. The range hood of claim 1, wherein the range hood further comprises:

the error microphone is arranged in the mounting cavity and is electrically connected with the control circuit system; the error microphone is used for monitoring the noise reduction effect in the installation cavity;

the control circuit system is also used for adjusting the sound emitted by the loudspeaker according to the noise reduction effect monitored by the error microphone.

3. The range hood of claim 2, wherein the fan assembly comprises:

the rack is internally provided with the mounting cavity and is provided with the smoke outlet and the smoke guide opening; the method comprises the steps of,

the fan is arranged in the mounting cavity and is provided with an air inlet and an air outlet, and the air outlet is connected with the smoke outlet;

wherein the error microphone is positioned between the air inlet and the smoke guide port; the reference microphone is arranged opposite to the air inlet.

4. A range hood according to claim 3, further comprising:

the noise reduction assembly is arranged on the rack and is opposite to the air inlet; the noise reduction assembly is used for absorbing noise generated in the installation cavity.

5. The range hood of claim 4, wherein the noise reduction assembly comprises:

the noise reduction plate is arranged on the frame and is opposite to the air inlet; the noise reduction plate is provided with a containing cavity; the surface of the noise reduction plate, which is close to one side of the air inlet, is provided with noise reduction holes; the method comprises the steps of,

noise reduction cotton is filled in the accommodating cavity and used for absorbing noise generated in the mounting cavity.

6. The range hood of claim 5, wherein the surface of the noise reduction plate adjacent to the air inlet is an inclined surface; along the direction of keeping away from the smoke guide mouth, the surface of the board of making an uproar that falls is close to air intake one side is close to gradually the air intake.

7. The range hood of claim 5 wherein the noise reduction assembly further comprises:

the guide plate is positioned at one side of the noise reduction plate close to the smoke inlet; the first end of the guide plate is connected with the frame, and the second end of the guide plate is connected with the noise reduction plate;

the air inlet is formed in the air inlet, the air guide plate is obliquely arranged, the first end of the air guide plate is close to the smoke guide opening relative to the second end of the air guide plate, the air guide plate points to the direction of the second end of the air guide plate along the first end of the air guide plate, and the air guide plate is gradually close to the air inlet.

8. The range hood of any one of claims 1-7 wherein the control circuitry is located on a side of the fan assembly where the exhaust port is located and on a side of the exhaust port, and is connected to the fan assembly.

9. The range hood of any one of claims 1-7 wherein the speaker is positioned proximate the smoke port.

10. The range hood of claim 9, wherein the number of speakers is plural, and the plural speakers are spaced apart.