CN218328332U - Active noise reduction device and range hood applying same - Google Patents

Abstract

The utility model relates to a device of making an uproar and use its range hood falls in initiative, fall the device of making an uproar and include microphone subassembly, speaker subassembly and controller in the initiative, the controller is from microphone subassembly received noise signal and is generated and fall the signal of making an uproar, and then transmits to the speaker subassembly in order to send and fall the sound wave of making an uproar: the loudspeaker box also comprises a box body, a channel for sound transmission is formed in the box body in a hollow mode, and the microphone assembly and the loudspeaker assembly are arranged on the box body. The active noise reduction device is used as an independent unit module, and when the active noise reduction device is processed and produced, the loudspeaker assembly and the microphone assembly are assembled on the box body, so that the modularized noise reduction device improves the production efficiency and reduces the production cost. When the range hood is matched with the range hood, the range hood is connected to the body of the range hood through an independent module, and can be adapted to different types of range hoods.

Description

Active noise reduction device and range hood applying same

Technical Field

The utility model relates to an active noise reduction device and use its range hood.

Background

Active noise reduction is taken as a novel noise reduction technology and is currently considered to be applied to the range hood. In order to achieve effective noise reduction, most of range hoods are implemented by arranging a corresponding active noise reduction device inside a smoke collection hood or a fan frame, the existing active noise reduction device usually comprises a microphone and a loudspeaker, namely, the microphone collects noise generated when the range hood works, the collected noise sound waves are transmitted to a controller in the form of electric signals, the controller analyzes and processes the signals and sends instructions to the loudspeaker to control the loudspeaker to emit noise reduction sound waves matched with the noise sound waves, and further the noise reduction effect is achieved.

In the active noise reduction device, the microphone and the loudspeaker components are dispersedly arranged in the shell of the range hood, so that the assembly process of the range hood is complicated during production. More importantly, because the noise sound field characteristics of different range hoods are different, the positions of the speakers and the microphones of the active noise reduction device, which need to be arranged, are also different, and therefore, for different range hoods, the mounting structures of the components of the active noise reduction device need to be redesigned according to the specific structural characteristics of the range hood. In summary, the active noise reduction device has poor versatility, and cannot be well adapted to different types of range hoods, and the active noise reduction effect is also different due to different structural characteristics of the range hoods.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem is to prior art's current situation, provides a device of making an uproar falls in modularization initiative of the different application of ability adaptation.

The utility model discloses the second technical problem that will solve is the current situation to prior art, provides a range hood who uses the above-mentioned device of making an uproar that falls in initiative.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: an active noise reduction device comprising a microphone assembly, a speaker assembly and a controller, the controller receiving a noise signal from the microphone assembly and generating a noise reduction signal for transmission to the speaker assembly to emit a noise reduction sound wave:

the loudspeaker box also comprises a box body, a channel for sound to propagate in the box body is formed in the box body in a hollow mode, and the microphone assembly and the loudspeaker assembly are arranged on the box body.

The above-mentioned "the microphone assembly and the speaker assembly are both disposed on the box" may mean that the microphone assembly is disposed inside the box, or may be disposed outside the box, or both (when the microphone assembly has more than two microphones), and the disposition position of the speaker assembly is also the same.

In order to facilitate the installation of all parts of the noise reduction device, the noise reduction device also comprises a fixing frame which is detachably connected in the box body, the fixing frame extends along the direction which is basically vertical to the extending direction of the channel in the box body, and the microphone assembly is arranged on the fixing frame.

In order to ensure the accuracy of collecting noise signals by the microphone assembly, the microphone assembly comprises at least two microphones, and the microphones are arranged on the fixed frame and are sequentially arranged along the extending direction of the fixed frame.

The loudspeaker assembly can be arranged inside the box body or outside the box body, and is arranged outside the box body in order to avoid the reduction of the flow area of the channel and the increase of the flow resistance in the channel due to the arrangement of the loudspeaker inside the channel. The loudspeaker is arranged outside the box body, so that the pollution of smoke in the channel (such as the situation of reducing noise in the range hood) to the loudspeaker is reduced, and the service life of the loudspeaker is prolonged.

As an improvement, in order to avoid the problems that the appearance of the active noise reduction device is influenced by local outward projection of the active noise reduction device due to the fact that the loudspeaker assembly is arranged outside the box body and cannot be well matched with the surrounding installation environment, the loudspeaker assembly is arranged inside the box body.

In order to enable noise reduction sound waves emitted by the loudspeaker to face the inside of the channel as much as possible, the loudspeaker assembly comprises at least one loudspeaker, sound transmission holes are formed in the position, corresponding to the loudspeaker, of the box body, and the sound production surface of the loudspeaker faces the inside of the box body through the sound transmission holes.

In order to reasonably arrange the installation positions of the speakers, the box body comprises a first side wall and a second side wall which are oppositely arranged, and the speakers are arranged on the first side wall and the second side wall. The loudspeakers are arranged on two sides of the channel, so that the influence on the attractiveness of the loudspeaker due to the increase of the thickness of the channel is avoided.

In order to ensure the overall aesthetic property of the noise reduction device and realize the sound insulation purpose of the loudspeaker, the first side wall and the second side wall are also provided with a cover shell used for covering the corresponding loudspeaker. Place the sound insulation housing in the speaker outside, play the decoration effect, guarantee the aesthetic property, also can avoid setting up the sound wave that the speaker outside the box sent toward external radiation, transmit the culinary art person, increase the noise, influence user's use and experience.

In order to avoid the influence of noise reduction sound waves generated by the loudspeaker on the accuracy of microphone collection, the loudspeaker assembly comprises at least two loudspeakers sequentially arranged at intervals along the extension direction of the fixing frame, along the propagation direction of sound in the channel, each loudspeaker is positioned at the downstream of the microphone assembly, and the sound production direction deviates from the microphone.

The loudspeakers can be uniformly distributed in the channel, so that the noise reduction sound waves emitted by the loudspeakers can cover the whole channel range as much as possible, and the noise reduction effect is ensured.

In order to further improve the noise reduction effect, the distance between the loudspeaker assembly and the microphone assembly ranges from 100mm to 200mm. The distance between the loudspeaker component and the microphone component is within the range, so that the sound field detected by the microphone and the sound field to be processed by the loudspeaker are ensured to have better criticality, and the algorithm has higher calculation stability.

As an improvement, the cabinet comprises a third side wall and a fourth side wall which are oppositely arranged, the third side wall is provided with the loudspeaker, and the sound emitting surface of the loudspeaker faces the fourth side wall of the cabinet. The loudspeaker on the third lateral wall of locating the box launches out and falls the sound wave of making an uproar (also fall the sound wave of making an uproar for the first time), propagates in the passageway of box, because the fourth lateral wall reflex action of box can form the reflection sound wave, in the reflection sound wave gets back to the passageway of box again, with fall the sound wave of making an uproar for the first time and superpose, fall the sound wave of making an uproar and fluctuate in the box, form the reverberation field for the sound wave that the loudspeaker sent has the reinforcing effect, promotes the noise reduction effect.

The loudspeaker assembly can be arranged outside the box body or inside the box body, preferably, a sound-transmitting hole is formed in the position, corresponding to the loudspeaker, on the third side wall of the box body, the loudspeaker is arranged on the outer side of the third side wall of the box body, and the sound-emitting surface of the loudspeaker faces to the fourth side wall of the box body through the sound-transmitting hole. Above-mentioned structural design can avoid reducing the passageway area of overflowing because of the speaker sets up inside the passageway, increases the flow resistance in the passageway, influences the fan performance.

In order to be conveniently mounted and dismounted with the body of the range hood, the box body is flat and is provided with a first connecting port and a second connecting port which are opposite. The flat box structure makes the whole active noise reduction device smaller and more compact, and avoids occupying larger space when the active noise reduction device is installed on the range hood main body, such as the occupied space of a cabinet in a kitchen environment.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: the utility model provides a range hood, includes fan frame, collection petticoat pipe and as above-mentioned device of making an uproar falls in the initiative, be equipped with the fan system in the fan frame, the fan frame has the air intake, the collection petticoat pipe is last to have flue gas entry and exhanst gas outlet, the air intake of fan frame and collection petticoat pipe fluid intercommunication mutually between the exhanst gas outlet, and, the box of the device of making an uproar falls in the initiative is connected with the mode that can shirk the air intake of fan frame with between the exhanst gas outlet of collection petticoat pipe.

The range hood adopts a split design that a fan frame and a smoke collecting hood are sequentially arranged in the up-down direction, wherein, the active noise reduction device is an independent module and can be directly connected with smoke collecting hoods and fan systems in different forms or connected with the smoke collecting hoods and the fan systems through a switching section, so the range hood can be suitable for different occasions, such as the smoke collecting hood structure applied to side-suction type, european type and ultrathin range hoods. Certainly, the smoke collecting cavity and the fan system which are connected with the upper end and the lower end of the active noise reduction device can also adopt other forms and are connected between the fan system and the smoke collecting hood, so that the noise generated by the fan system can be transmitted from the smoke collecting hood through the active noise reduction section, and when the noise passes through, the active noise reduction device plays a role and realizes noise reduction by emitting noise reduction sound waves.

Preferably, the air inlet of the fan frame is in fluid communication with the flue gas outlet of the fume collecting hood only through the box body of the active noise reduction device. It is conceivable that the air inlet of the fan frame and the smoke outlet of the smoke collecting hood are in fluid communication with each other through the box of the active noise reduction device, and may also be in communication with each other through other passages, that is, the air inlet of the fan frame and the corresponding port of the box of the active noise reduction device may also be connected through other passages, and similarly, the smoke outlet of the smoke collecting hood and the other port of the active noise reduction device may also be connected through other passages.

Compared with the prior art, the utility model has the advantages that: the utility model provides an active noise reduction device is as an independent unit module, and when processing production, its speaker subassembly and microphone subassembly are assembled to the box on, and the device of making an uproar falls in the modularization, has promoted production efficiency, has reduced manufacturing cost. When the active noise reduction device is matched with the range hood, the active noise reduction device can be connected to the body of the range hood by an independent module (for example, the active noise reduction device can be connected between a fan frame and a fume collecting hood of the range hood), wherein the body of the range hood can be changed into different types, so that the active noise reduction device can be adapted to different types of the range hood. In addition, in the range hood applying the active noise reduction device, the active noise reduction device adopts the modularized design structure to be detachably connected with the body of the range hood, and the active noise reduction device is also greatly convenient to be directly detached, maintained or replaced from the body of the range hood in the later period.

Drawings

Fig. 1 is a schematic perspective view of a noise reduction device according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the structure of FIG. 1 without the third sidewall;

FIG. 3 is a schematic perspective view of the noise reducer of FIG. 1 with one of the housings and the speaker in an exploded configuration;

fig. 4 is a perspective cross-sectional view of the active noise reduction device according to the embodiment of the present invention, cut along the horizontal direction;

fig. 5 is a schematic perspective view of an active noise reduction device according to another embodiment of the present invention;

FIG. 6 is a schematic perspective view of the third sidewall of FIG. 5 with the active noise reducer omitted and in an exploded position;

FIG. 7 is a front view of the noise reducer of FIG. 6 with the third sidewall omitted;

fig. 8 is a schematic perspective view of an active noise reduction device according to still another embodiment of the present invention;

FIG. 9 is a vertical cross-sectional view of the active noise reducer of FIG. 8 taken in a left-right direction;

fig. 10 is a schematic perspective view of an active noise reduction device according to still another embodiment of the present invention;

FIG. 11 is a transverse cross-sectional view of the active noise reducer of FIG. 10;

FIG. 12 is an exploded view of the active noise reducer of FIG. 10;

fig. 13 is a schematic perspective view of a range hood according to an embodiment of the present invention;

FIG. 14 is a vertical sectional view of the range hood of FIG. 13 taken in a front-to-rear direction;

fig. 15 is a schematic perspective view of another range hood according to an embodiment of the present invention;

fig. 16 is a vertical sectional view of the range hood of fig. 15, taken along the front-rear direction;

fig. 17 is a schematic perspective view of another range hood according to an embodiment of the present invention;

fig. 18 is a vertical sectional view of the range hood of fig. 17, taken along a front-rear direction.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

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

Referring to fig. 1 to 4, the active noise reduction device 40 includes a case 41, a fixing frame 44, a housing 45, a microphone assembly 42, a speaker assembly 43, and a controller. The microphone assembly 42 is used for collecting noise signals transmitted to the area of the box body 41 by a noise source, the loudspeaker assembly 43 is used for emitting noise reduction sound waves matched with the noise signals, and the noise reduction sound waves can be superposed and offset to realize active noise reduction. Specifically, the microphone assembly 42 and the speaker assembly 43 are electrically connected to a control system of the range hood, and the control system generates a noise reduction signal according to a received noise signal of the microphone assembly 42 and transmits the noise reduction signal to the speaker assembly 43 to emit noise reduction sound waves. The control process and the working principle of the active noise reduction implemented by matching the microphone component 42 and the speaker component 43 are all the prior art, and are not described herein.

The housing 41 has a passage 410 therein through which the air flow passes. The box 41 has a first connection port 411 and a second connection port 412 opposite to each other for connecting with an external component, and the first connection port 411 and the second connection port 412 are two ports of a channel. For example, the first connection port 411 may be used to connect with a smoke outlet 22 of an external component such as a body (smoke collection cover 20) of a range hood, and the second connection port 412 may be used to connect with an air inlet 31 of a fan frame 30.

The case 41 of the active noise reducer is flat as a whole, and the first connection port 411 and the second connection port 412 of the case 41 are arranged to face each other in the vertical direction. The flat box structure makes the whole active noise reduction device smaller and more compact, and avoids occupying larger space when the active noise reduction device is installed on the range hood main body, such as the occupied space of a cabinet in a kitchen environment. The first connection port 411 and the second connection port 412 are oppositely arranged, so that the air inlet resistance can be reduced as much as possible, and the overall aesthetic property of the active noise reduction device is ensured.

Referring to fig. 6, the case 41 of the noise reducer has a first sidewall 401 and a second sidewall 402 that are arranged opposite to each other in the left-right direction, and a third sidewall (i.e., a front sidewall) 403 and a fourth sidewall (i.e., a rear sidewall) 404 that are opposite to each other in the front-rear direction.

The holder 44 is detachably attached to the inside of the case 41 and extends in the lateral direction. Specifically, the fixing frame 44 is a rod-shaped structure, and both left and right ends thereof may be connected to the first side wall 401 and the second side wall 402 of the case 41 by screws. The microphone assembly 42 includes at least two microphones 421 sequentially arranged at intervals along the extending direction of the fixing frame 44, and as shown in fig. 2, the 6 microphones 421 are uniformly arranged in the left-right direction.

With reference to fig. 2 and fig. 3, in a possible embodiment, the speaker assembly 43 is disposed on an outer side wall of the box 41, specifically, the speaker assembly 43 is located at a height lower than that of the microphone assembly 42, that is, in a noise transmission direction, the speaker assembly 43 is located downstream of the microphone assembly 42, so that during the process of transmitting noise of the fan system 10 into the box 41, the microphone assembly 42 first detects the noise, and then the speaker assembly 43 downstream of the noise transmission direction is controlled to perform effective noise reduction, thereby ensuring noise reduction effect.

Referring to fig. 2, the speaker assembly 43 includes two speakers 431, and the two speakers 431 are symmetrically disposed on the first and second sidewalls 401 and 402, specifically, disposed outside the first and second sidewalls 401 and 402. The first side wall 401 and the second side wall 402 of the cabinet 41 have sound-transmitting holes 413 at positions corresponding to the speaker assemblies 43, and the sound emission direction of the speaker assemblies 43 is directed toward the sound-transmitting holes 413, that is, toward the inside of the duct.

The two symmetrically arranged speakers 431 are arranged on the outer side of the box body 41, so that the phenomenon that the flow area of the channel is reduced because the speakers 431 are arranged inside the channel can be avoided, the resistance of the air channel is increased, the performance of the fan is influenced, and the phenomenon that new noise is generated because the smoke is blocked. In addition, the speaker 431 arranged outside the box 41 is only contacted with the fluid in the channel through the sound-transmitting hole 413, so that the adhesion of oil smoke on the speaker 431 is greatly reduced, and the influence of the reduction of noise caused by the weakening of the sound-producing capability of the speaker 431 due to the adhesion of the oil smoke is avoided as much as possible. The sound waves with the same phase sent by the two loudspeakers 431 which are symmetrically arranged can be superposed to a certain extent, the peak value is higher after superposition, the sound waves with stronger energy can be formed, the stronger energy sound waves and the original noise sound waves of the range hood are offset after superposition, and the noise reduction effect is improved. The noise reduction device of this embodiment need not to consider the quantity and the volume of increasing the speaker and just can obtain better noise reduction effect, has reduced manufacturing cost, has also avoided causing the influence because of the increase of speaker volume and quantity to the flow field in the passageway for the device of making an uproar is whole more small and exquisite compacter.

The enclosure 45 has two corresponding enclosures, which are respectively connected to the first side wall 401 and the second side wall 402 of the cabinet 41 and are correspondingly covered outside the left and right speakers 431. The enclosure 45 is provided to protect the speaker assembly 43, and to provide sound insulation.

Fig. 5 to 7 show another structure of the active noise reduction device, in which the speaker assembly 43 is disposed inside the cabinet 41, and is fixed to the fixing frame 44. Specifically, the speaker assembly 43 includes at least two speakers 431 arranged at intervals in sequence along the extending direction of the fixing frame 44, as seen in fig. 7, the speakers 431 are shown in 2, the two speakers 431 are located below the microphone assembly 42 (assuming that sound propagates from top to bottom along the channel 410), and the sound emitting direction is away from the microphone 421, that is, downward. In order to further improve the noise reduction effect, the distance between the speaker 431 and the microphone 421 has a value range of H, where H has a value range of: the distance is 100mm-200mm, and experimental tests prove that the value range can ensure that the criticality between the sound field detected by the microphone 421 and the sound field to be processed by the loudspeaker 431 is good, so that the algorithm has high calculation stability.

In this embodiment, the fixing frame 44, and the microphone assembly 42 and the speaker assembly 43 disposed thereon can be taken as an independent unit, and can be conveniently installed in the box 41 or removed from the box 41 for cleaning or maintenance, so as to improve the production efficiency and facilitate the post-maintenance. In addition, the microphone assembly 42 and the speaker assembly 43 are fixed on the same fixing frame 44, and the accuracy of the relative position of the microphone 421 and the speaker 431 is ensured, so that the influence caused by larger relative error is reduced.

Referring to fig. 8 and 9, showing another structure of the active noise reduction device, it can be seen that, in this embodiment, the microphone assembly 42 and the speaker assembly 43 are both disposed inside the box body 41, wherein the fixing frame 44 in fig. 6 is omitted, and the microphone assembly 42 and the speaker assembly 43 are both disposed on the inner side wall of the box body 41. Six microphones 421 are provided on the inner sidewall of the case 41 at intervals in the left-right direction. The speaker assemblies 43 are provided in two sets, respectively, on the inner sides of the first side wall 401 and the second side wall 402 of the cabinet 41, wherein the two sets of speaker assemblies 43 are symmetrically arranged. Each set of speaker assemblies 43 includes two speakers 431 arranged in sequence from top to bottom, and sound emitting surfaces of the two speakers 431 face the inside of the cabinet 41. In this embodiment, the speaker assembly 43 is also located below the microphone assembly 42 (again assuming sound travels from top to bottom along the channel 410).

Referring to fig. 10 to 12, showing the structure of still another active noise reduction device, it can be seen that in this embodiment, the microphone assembly 42 is disposed inside the case 41, and the speaker assembly 43 is disposed outside the case 41, specifically, the difference between this embodiment and the active noise reduction device shown in fig. 1 is that: the speaker assembly is disposed on a third side wall (i.e. a front side wall) 403 of the cabinet 41, wherein the third side wall 403 and a fourth side wall 404 of the cabinet 41 are disposed oppositely, and a sound emitting surface of each speaker 431 of the speaker assembly 43 faces the inside of the cabinet 41, i.e. the fourth side wall 404 of the cabinet 41. The distance between the third sidewall 403 and the fourth sidewall 404 is L, and the value of L ranges from 50 to 400mm, preferably from 100 to 150mm. As can be seen from fig. 11, the distance between the third sidewall 403 and the fourth sidewall 404 of the box 41 is smaller than the distance between the first sidewall 401 and the second sidewall 402, so that the channel 410 in the box 41 forms a flat thin air duct.

The speaker assembly 43 has a set including 3 speakers 431 arranged in order in the left-right direction. The third side wall 403 of the cabinet 41 has sound-transmitting holes 413 formed at positions corresponding to the 3 speakers 431, and the sound-emitting surfaces of the speakers 431 face the inside of the cabinet 41 through the sound-transmitting holes 413. In this embodiment, the speaker assembly 43 is also located below the microphone assembly 42 (again assuming sound travels from top to bottom along the channel 410).

The third side wall 403 of the cabinet 41 is further provided with a cover 45 covering the speaker assembly 43, specifically, the cover 45 is a strip-shaped housing extending transversely, and can cover 3 speakers 431 together after being connected to the cabinet 41. The cover body can adopt an outer cover with better sound insulation, such as high-density damping glue, a thicker metal cover and the like.

The speaker assembly 43 is located below the microphone assembly 42 (again assuming sound travels from top to bottom along the channel 410) and there is no other component barrier between the speaker assembly 43 and the fourth side wall 404 of the housing 41. The noise reduction sound wave (i.e. the primary noise reduction sound wave) emitted by the speaker 31 disposed on the third side wall 403 of the box 41 propagates backward in the channel 410 of the box 41 and reaches the surface of the fourth side wall of the box 41, and the reflected sound wave is formed due to the reflection action of the fourth side wall 404 of the box 41 and returns to the channel 410 of the box 41 again to be superposed with the primary noise reduction sound wave, and the noise reduction sound wave repeatedly fluctuates in the box 41 to form a reverberation field, so that the sound wave emitted by the speaker 431 has an enhancing effect and the noise reduction effect is improved.

On the other hand, because the thin air duct is relatively narrow and has a limited flow area, the speaker 431 is disposed outside the third sidewall 403 of the box 41, thereby preventing the speaker 431 with a large volume from being disposed in the air duct to reduce the flow area of the air duct, increase the air duct resistance, and affect the performance of the fan. Meanwhile, the speaker 431 is located outside the third sidewall 403 of the cabinet 41 (the speaker is located outside the first sidewall 401 and the second sidewall 402 in the same manner), so that secondary noise caused by the impact of the airflow on the speaker 41 is avoided, and the overall noise reduction effect is improved. Because the airflow impacts the loudspeaker to generate secondary noise below the microphone, the microphone is difficult to accurately detect, so that the secondary noise cannot be considered by signals sent to the loudspeaker by the control main board, and the active noise reduction effect is influenced.

Fig. 13-18 show three different types of range hood structures using the active noise reduction device.

Fig. 13 and 14 show a thin range hood with a small depth dimension of the smoke collecting hood, which includes a fan frame 30, a smoke collecting hood 20 and the noise reduction device 40, wherein the fan frame 30 is provided with the fan system 10 therein, the fan frame 30 has an air inlet 31 at the bottom and an air outlet 32 at the top, and the smoke collecting hood 20 has a smoke inlet 21 and a smoke outlet 22. The noise reduction device 40 is connected between the air inlet 31 of the fan frame 30 and the flue gas outlet 22 of the fume collecting hood 20, the second connection port 412 of the box 41 of the noise reduction device is connected with the air inlet 31 of the fan frame 30 through screws or buckles, and the first connection port 411 is connected with the flue gas outlet 22 of the fume collecting hood 20 through screws or buckles. More specifically, the smoke collecting hood of the present embodiment is a thin type smoke collecting hood whose depth is small (i.e., the size in the front-rear direction is small). The vertical section of the fume collecting hood 20 along the front-back direction is an inverted triangle structure with a wide upper part and a narrow lower part, wherein a fume inlet 21 is arranged at the front side of the fume collecting hood 20, and a fume outlet 22 is arranged at the top of the fume collecting hood. The rear side of the fume collecting hood 20 extends vertically and can be attached to a wall.

Referring to fig. 15 and 16, another range hood is shown, which differs from the range hood in fig. 8 in that: the type of the fume collecting hood 20 is different, the fume collecting hood 20 is similar to a fume collecting hood of a conventional near-suction range hood, the front and rear depth of the fume collecting hood is relatively large, the front side wall is inclined backwards from top to bottom, and the fume inlet 21 is formed in the front side wall.

Referring to fig. 17 and 18, another range hood is shown, which is different from the range hood in fig. 8 in that: the fume collecting hood 20 is similar to the fume collecting hood of a conventional top-suction range hood, the longitudinal depth of the fume collecting hood is relatively large, the bottom of the fume collecting hood 20 is provided with a concave fume collecting area 200, and the fume inlet 21 is arranged in the middle area of the fume collecting area 200 at the bottom of the fume collecting hood.

The construction of the blower housing 30 described above may also be simplified to a bellows construction for mounting the blower system 10.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter, referred to as a first portion and a second portion) in a unified manner, i.e., a fluid (gas, liquid or a mixture thereof) can flow along a flow path from the first portion or/and be transported to the second portion, and may be directly communicated between the first portion and the second portion, or indirectly communicated between the first portion and the second portion via at least one third member, which may be a fluid passage such as a pipe, a channel, a duct, a flow guide member, a hole, a groove, or a chamber allowing the fluid to flow therethrough, or a combination thereof.

Claims (15)

1. An active noise reduction device comprising a microphone assembly (42), a speaker assembly (43), and a controller, the controller receiving a noise signal from the microphone assembly (42) and generating a noise reduction signal for transmission to the speaker assembly (43) to emit noise reduction sound waves:

the method is characterized in that: the microphone assembly is characterized by further comprising a box body (41), a channel (410) for sound to propagate in the box body (41) is formed in the box body (41) in a hollow mode, and the microphone assembly (42) and the loudspeaker assembly (43) are arranged on the box body (41).

2. The active noise reduction device of claim 1, wherein: the microphone assembly is characterized by further comprising a fixing frame (44) detachably connected in the box body (41), wherein the fixing frame (44) extends along a direction basically perpendicular to the extending direction of the channel (410), and the microphone assembly (42) is arranged on the fixing frame (44).

3. The active noise reduction device of claim 2, wherein: the microphone assembly (42) comprises at least two microphones (421), and the microphones (421) are arranged on the fixed frame (44) and are sequentially arranged along the extending direction of the fixed frame (44).

4. The active noise reduction device according to any one of claims 1 to 3, wherein: the speaker assembly (43) is provided outside the cabinet (41).

5. The active noise reduction device according to any one of claims 1 to 3, wherein: the speaker assembly (43) is disposed inside the cabinet (41).

6. The active noise reduction device of claim 4, wherein: the loudspeaker assembly (43) comprises at least one loudspeaker (431), a sound transmission hole (413) is formed in the position, corresponding to the loudspeaker (431), of the box body (41), and the sound emitting surface of the loudspeaker (431) faces the interior of the box body (41) through the sound transmission hole (413).

7. The active noise reduction device of claim 6, wherein: the box body (41) comprises a first side wall (401) and a second side wall (402) which are oppositely arranged, and the loudspeaker (431) is arranged on each of the first side wall (401) and the second side wall (402).

8. The active noise reduction device of claim 7, wherein: and the first side wall (401) and the second side wall (402) are also provided with a cover shell (45) used for covering the corresponding loudspeaker (431).

9. The active noise reduction device according to claim 2 or 3, characterized in that: the loudspeaker assembly (43) comprises at least two loudspeakers (431) which are sequentially arranged at intervals along the extension direction of the fixed frame (44), and each loudspeaker (431) is positioned at the downstream of the microphone assembly (42) along the propagation direction of sound in the channel (410), and the sound production direction is opposite to the microphone (421).

10. The active noise reduction device of claim 9, wherein: the distance between the loudspeaker component (43) and the microphone component (42) ranges from 100mm to 200mm.

11. The active noise reduction device according to any one of claims 1 to 3, wherein: the box body (41) comprises a third side wall (403) and a fourth side wall (404) which are oppositely arranged, the third side wall (403) is provided with the loudspeaker (431), and the sound emitting surface of the loudspeaker (431) faces the fourth side wall (404) of the box body (41).

12. The active noise reduction device of claim 11, wherein: and a sound-transmitting hole (413) is formed in the third side wall (403) of the box body (41) at a position corresponding to the loudspeaker (431), the loudspeaker (431) is arranged on the outer side of the third side wall (403) of the box body (41), and the sound-emitting surface of the loudspeaker (431) faces to the fourth side wall (404) of the box body (41) through the sound-transmitting hole (413).

13. The active noise reduction device according to any one of claims 1 to 3, wherein: the box body (41) is flat as a whole and has a first connection port (411) and a second connection port (412) which are opposite.

14. A range hood, its characterized in that: the active noise reduction device comprises a fan frame (30), a smoke collecting hood (20) and the active noise reduction device according to any one of claims 1 to 13, wherein a fan system (10) is arranged in the fan frame (30), the fan frame (30) is provided with an air inlet (31), the smoke collecting hood (20) is provided with a smoke inlet (21) and a smoke outlet (22), the air inlet (31) of the fan frame (30) is in fluid communication with the smoke outlet (22) of the smoke collecting hood (20), and a box body (41) of the active noise reduction device is detachably connected between the air inlet (31) of the fan frame (30) and the smoke outlet (22) of the smoke collecting hood (20).

15. The range hood of claim 14, wherein: the air inlet (31) of the fan frame (30) is in fluid communication with the smoke outlet (22) of the smoke collecting cover (20) only through a box body (41) of the active noise reduction device.

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