A range hood with an active noise reduction module

Abstract

The utility model discloses an active noise reduction module's range hood. The range hood includes smoke collecting cavity, mainframe box and active noise reduction module, and active noise reduction module includes reference microphone array, speaker array and error microphone array, and the smoke collecting cavity is fixed below the mainframe box and communicates with the mainframe box and forms the air flow channel, and the reference microphone array is located at the junction of the smoke collecting cavity and the mainframe box inside the air flow channel, and the speaker array and error microphone array are arranged in the smoke collecting cavity and oppose each other. The utility model embodiment can accurately measure the noise source signal of the range hood noise through the air flow channel into the room, and can simultaneously carry out the noise reduction treatment to the smoke collecting cavity from the angle of the actual experience of the user, and can also pertinently optimize the active noise reduction effect on the basis of effectively purifying the oil smoke and the kitchen environment, and improve the actual use experience of the user.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a range hood with an active noise reduction module. Background Technology

[0002] Active noise cancellation is a noise control technology that effectively reduces low- and mid-frequency noise levels. Current range hood noise reduction technology primarily targets conventional range hoods, where a smoke collection hood is connected to the bottom of the main unit, and the fan is housed within the main unit. Due to the exposed main unit and space constraints, active noise cancellation modules are typically placed inside the main unit. They collect the noise generated by the fan within the main unit and simultaneously play corresponding audio frequencies with opposite phase from a speaker for active noise cancellation.

[0003] However, more and more range hoods are being developed for different scenarios. For example, for range hoods hidden in cabinets, setting the active noise reduction module in the main unit box for noise reduction does not achieve a perfect noise reduction effect. Utility Model Content

[0004] This utility model provides a range hood with an active noise reduction module, which is designed for range hoods with a main unit and a smoke collection chamber. The active noise reduction module is installed in a specific way to optimize the noise reduction effect and improve the user experience.

[0005] This utility model embodiment provides a smoke hood with an active noise reduction module, including a smoke collection chamber, a main unit, and an active noise reduction module. The active noise reduction module includes a reference microphone array, a speaker array, and an error microphone array.

[0006] The smoke collection chamber is fixed below the main unit and connected to the main unit to form an airflow channel;

[0007] The reference microphone array is located at the connection between the smoke collection chamber and the main unit chassis inside the airflow channel, while the speaker array and error microphone array are set inside the smoke collection chamber and opposite each other.

[0008] Optionally, it also includes a reference microphone mount and a speaker mount;

[0009] The reference microphone mount is fixed at the connection between the smoke collection chamber and the main unit inside the airflow channel, and the reference microphone array is fixed on the reference microphone mount;

[0010] The loudspeaker mounting bracket is fixed inside the smoke collection chamber, and the loudspeaker array is fixed on the loudspeaker mounting bracket.

[0011] Optionally, the range hood also includes an error microphone mounting bracket, which is fixed to the speaker mounting bracket, and the error microphone array is fixed to the error microphone mounting bracket.

[0012] Optionally, both the reference microphone mount and the error microphone mount include a mounting plate and multiple wind deflectors. The mounting plate is parallel to the airflow direction of the airflow channel, and the wind deflectors are perpendicular to the airflow direction of the airflow channel. The wind deflectors are fixed to the side of the mounting plate on the windward side.

[0013] Both the reference microphone array and the error microphone array include multiple microphones that are arranged one-to-one with the wind deflector. The microphones are fixed on the fixed plate, and the projection of the microphones on the corresponding wind deflector along the first direction is located inside the wind deflector; wherein, the first direction is opposite to the airflow direction of the airflow channel.

[0014] Optionally, the error microphone array is fixed to the inner wall of the front panel of the smoke collection chamber.

[0015] Optionally, both the reference microphone array and the error microphone array include multiple microphones. Each microphone includes a housing and a microphone body located inside the housing. The housing has a wind deflector on the windward side, which is perpendicular to the airflow direction of the airflow channel.

[0016] Optionally, the reference microphone mounting bracket includes a main mounting plate and two side mounting plates, with the two ends of the main mounting plate integrally connected to the two side mounting plates respectively in the extending direction;

[0017] The reference microphone array includes multiple microphones, some of which are sequentially fixed to the main mounting plate along its extension direction, while others are mounted on the side mounting plates.

[0018] Optionally, the speaker array includes multiple speakers, which are arranged and fixed in sequence on a speaker mounting bracket;

[0019] The range hood also includes a filter screen. The plane where the filter screen is located is parallel to the plane where the speaker mounting bracket is located. The filter screen is located on the side of multiple speakers away from the speaker mounting bracket and is connected to the speaker mounting bracket.

[0020] Optionally, the filter is a removable filter, which is detachably connected to the speaker mounting bracket.

[0021] Optionally, the vertical distance H between the reference microphone array and the speaker array satisfies: 10cm ≤ H ≤ 25cm.

[0022] The technical solution of this utility model embodiment, by setting the reference microphone array in the active noise cancellation module at the connection between the smoke collection chamber and the main unit in the airflow channel, can accurately measure the noise source signal of the range hood noise entering the room through the airflow channel. At the same time, by setting the speaker array in the active noise cancellation module inside the smoke collection chamber and opposite to the error microphone array, noise reduction processing of the smoke collection chamber can be specifically performed from the perspective of actual user experience. On the basis of effectively purifying oil fumes and purifying the kitchen environment, the active noise cancellation effect can also be specifically optimized to improve the actual user experience. Attached Figure Description

[0023] Figure 1 This is a front view of a range hood with an active noise reduction module provided in an embodiment of this utility model;

[0024] Figure 2 yes Figure 1 The side view of the range hood shown;

[0025] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure of the range hood shown;

[0026] Figure 4 yes Figure 1 The diagram shows the structure of the active noise reduction module in the range hood.

[0027] Figures 5-7 yes Figure 4 The diagram shows three partial structural diagrams of the active noise cancellation module.

[0028] Figure 8 yes Figure 7 The diagram shows a partial disassembly of the active noise cancellation module.

[0029] in:

[0030] 10-Smoke collection chamber, 100-Smoke inlet, 20-Main unit, 21-Fan, 31-Reference microphone array, 32-Speaker array, 320-Speaker, 33-Error microphone array, 300-Microphone, 41-Reference microphone mount, 42-Speaker mount, 43-Error microphone mount, 400-Mounting plate, 401-Main mounting plate, 402-Side mounting plate, 410-Wind deflector, 50-Filter. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] The terminology used in the embodiments of this utility model is for the purpose of describing specific embodiments only and is not intended to limit the utility model. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this utility model are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when referring to an element being formed "upper" or "lower" of another element, it can be formed not only directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The term "comprising" and its variations as used in this utility model are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0034] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0035] It should be noted that the terms "a" and "a plurality of" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0036] Figure 1 This is a front view of a range hood with an active noise reduction module provided in an embodiment of this utility model. Figure 2 yes Figure 1 The side view of the range hood shown is shown. Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the range hood. Figure 4 yes Figure 1 The diagram shows the structure of the active noise reduction module in the range hood. Figures 5-7 yes Figure 4 The diagram shows three partial structural diagrams of the active noise cancellation module. Figure 8 yes Figure 7 The diagram shown is a partial disassembly diagram of the active noise cancellation module, for reference. Figures 1-8The smoke generator includes a smoke collection chamber 10, a main unit housing 20, and an active noise reduction module. The active noise reduction module includes a reference microphone array 31, a speaker array 32, and an error microphone array 33. The smoke collection chamber 10 is fixed below the main unit housing 20 and communicates with the main unit housing 20 to form an airflow channel. The reference microphone array 31 is located at the connection between the smoke collection chamber 10 and the main unit housing 20 inside the airflow channel. The speaker array 32 and the error microphone array 33 are arranged inside the smoke collection chamber 10 and are opposite to each other.

[0037] First, such as Figures 1-3 As shown, the range hood example in this embodiment can be a concealed range hood, where the main unit 20 is installed and enclosed in a cabinet above the cooktop, and the smoke collection chamber 10 is connected below the main unit 20 and exposed outside the cabinet. The smoke collection chamber 10 is provided with a side-suction or bottom-suction smoke inlet 100. The fan 21 in the main unit 20 provides negative pressure so that the fumes generated during cooking are discharged outdoors through the smoke inlet 100 and flow through the airflow channel formed by the connection between the smoke collection chamber 10 and the main unit 20. It is understood that in this type of range hood, not only is the main unit 20 a cavity structure, but the smoke collection chamber 10 is also a cavity structure. When the fan 21 operates and generates noise, due to the obstruction of the cabinet, more noise will spread into the room from the main unit 20, the smoke collection chamber 10, and the smoke inlet 100. In other words, the airflow channel formed by the connection between the main unit 20 and the smoke collection chamber 10 also constitutes a channel for noise to enter the room in the opposite direction. From the user's perspective, the smoke collection chamber 10 is more like the source of noise.

[0038] refer to Figures 3-6 Based on this, in this embodiment, for the active noise cancellation module, the reference microphone array 31 used for noise acquisition is placed at the connection between the smoke collection chamber 10 and the main unit 20 within the airflow channel. Its main purpose is to detect the noise flowing from the main unit 20 to the smoke collection chamber 10, which better reflects the noise source signal entering the room through the airflow channel. Simultaneously, the speaker array 32 in the active noise cancellation module is placed inside the smoke collection chamber 10. This primarily cancels noise by generating anti-phase sound waves, specifically canceling the noise propagating into the smoke collection chamber 10, thereby eliminating noise within the smoke collection chamber 10 as much as possible and eliminating the noise source from the user's actual experience perspective. Furthermore, the error microphone array 33 is placed on the opposite side of the speaker array 32, which can accurately detect the noise reduction effect of the speaker array 32 on the smoke collection chamber 10, thus optimizing the active noise cancellation effect of the speaker array 32.

[0039] The technical solution of this embodiment, by setting the reference microphone array in the active noise cancellation module at the connection between the smoke collection chamber and the main unit in the airflow channel, can accurately measure the noise source signal of the range hood entering the room through the airflow channel. At the same time, by setting the speaker array in the active noise cancellation module inside the smoke collection chamber and opposite it to the error microphone array, noise reduction processing of the smoke collection chamber can be carried out in a targeted manner from the perspective of actual user experience. On the basis of effectively purifying oil fumes and purifying the kitchen environment, the active noise cancellation effect can also be optimized in a targeted manner to improve the actual user experience.

[0040] refer to Figure 3 and Figure 4 Optionally, the vertical distance H between the reference microphone array 31 and the speaker array 32 satisfies: 10cm≤H≤25cm, and for example, it can be 22cm, 19cm, or 14cm.

[0041] It is understandable that, since the speaker array 32 actively reduces noise from the noise signal collected by the reference microphone array 31, if the distance between the speaker array 32 and the reference microphone array 31 is too close, the speaker 320 may not be able to generate an anti-phase sound wave in time when the noise propagates from the reference microphone array 31 to the speaker array 32, resulting in poor active noise reduction. In this embodiment, the distance between the two is set to be greater than 5cm, which ensures that an anti-phase sound wave is generated in time and effectively superimposed and canceled out by the noise signal propagating to the speaker array 32, thereby stabilizing active noise reduction.

[0042] For reference Figures 3-6 In this embodiment of the present invention, the smoke hood also includes a reference microphone mounting bracket 41 and a speaker mounting bracket 42; the reference microphone mounting bracket 41 is fixed at the connection between the smoke collection chamber 10 and the main unit 20 inside the air flow channel, and the reference microphone array 31 is fixed on the reference microphone mounting bracket 41; the speaker mounting bracket 42 is fixed inside the smoke collection chamber 10, and the speaker array 32 is fixed on the speaker mounting bracket 42.

[0043] Furthermore, the range hood also includes an error microphone mounting bracket 43, which is fixed on the speaker mounting bracket 42, and the error microphone array 33 is fixed on the error microphone mounting bracket 43.

[0044] The reference microphone mount 41 and speaker mount 42 are mainly used to facilitate the fixing of the reference microphone array 31 and speaker array 32 inside the range hood. Exemplarily, the two mounts can be fixed to corresponding positions in the range hood with screws. In other embodiments, snap-fit, magnetic, or other fixing methods can also be used to fix the two mounts; no further limitations are imposed here. The error microphone mount 43 is used to facilitate the fixing of the error microphone array 33 inside the range hood. Fixing the error microphone mount 43 to the speaker mount 42 ensures that the error microphone array 33 and speaker array 32 form an accurate alignment. Furthermore, the speaker mount 42 can be fixed inside the smoke collection chamber 10 after the error microphone mount 43 is fixed to the speaker mount 42, making installation more convenient.

[0045] Continue to refer to Figures 3-6 Alternatively, both the reference microphone holder 41 and the error microphone holder 43 include a fixing plate 400 and multiple wind deflectors 410. The fixing plate 400 is parallel to the airflow direction of the airflow channel, and the wind deflectors 410 are perpendicular to the airflow direction of the airflow channel. The wind deflectors 410 are fixed to the side of the fixing plate 400 on the windward side.

[0046] Both the reference microphone array 31 and the error microphone array 33 include multiple microphones 300 that are arranged one-to-one with the wind deflector 410. The microphones 300 are fixed on the fixing plate 400, and the projection of the microphones 300 on the corresponding wind deflector 410 along the first direction is located inside the wind deflector 410; wherein, the first direction is opposite to the airflow direction of the airflow channel.

[0047] In this embodiment, both the reference microphone holder 41 and the error microphone holder 43 have a mounting plate 400. The mounting plate 400 can be understood as the main structure of the two holders. The mounting plate 400 is parallel to the airflow direction of the air channel, indicating that the mounting surface of the mounting plate 400 is a vertical side, which is used to mount the reference microphone array 31 and the error microphone array 33. At the same time, for each microphone 300 in the reference microphone array 31 and the error microphone array 33, the reference microphone holder 41 and the error microphone holder 43 are also provided with a wind deflector 410. The wind deflector 410 is perpendicular to the airflow direction, indicating that the wind deflector 410 is horizontally set. Each wind deflector 410 corresponds to one microphone 300 to block the vertically upward flowing oil fume airflow, thereby avoiding the interference of oil fume airflow fluctuations on the microphone 300 and ensuring the noise acquisition effect of the microphone 300.

[0048] Continue to refer to Figure 4 and Figure 6, in a specific embodiment, optionally, the reference microphone fixing frame 41 comprises a main fixing plate 401 and two side fixing plates 402, and two ends of the main fixing plate 401 in the extending direction are integrally connected with the two side fixing plates 402 respectively; the reference microphone array 31 comprises a plurality of microphones 300, part of the microphones 300 are sequentially fixed on the main fixing plate 401 along the extending direction of the main fixing plate 401, and the other part of the microphones 300 are arranged on the side fixing plates 402.

[0049] In this embodiment, considering that the size of the main chassis 20 enclosed in the cabinet is usually smaller than that of the smoke collecting chamber 10, the reference microphone fixing frame 41 fixed at the connection between the smoke collecting chamber 10 and the main chassis 20 needs to adapt to the main chassis 20 with a smaller size. Therefore, the reference microphone fixing frame 41 can be specifically configured as a three-surface connecting structure in a "C" shape. At this time, the microphones 300 can be arranged on both the main fixing plate 401 and the two side fixing plates 402 of the reference microphone fixing frame 41 to form the reference microphone array 31. Moreover, since the three-surface connecting structure has three surfaces, the noise signals collected by the reference microphone array 31 can be more three-dimensional and more accurate, which helps to improve the active noise reduction effect.

[0050] In other embodiments of the present utility model, the error microphone array can also be optionally fixed on the inner wall of the front panel of the smoke collecting chamber. Further, each of the reference microphone array and the error microphone array comprises a plurality of microphones, each microphone comprises a housing and a microphone body located inside the housing, the housing is provided with a wind deflector on the windward side, and the air flowing direction of the air flow passage of the wind deflector is perpendicular.

[0051] In this embodiment, for the error microphone array, no separate fixing frame is provided, and the error microphone array is directly fixed on the inner wall of the front panel of the smoke collecting chamber, so that fixing materials can be saved, and the cost can be saved to a certain extent. On this basis, considering the noise collection effect of the microphones in the error microphone array and the reference microphone array, the housing structures of both the error microphone and the reference microphone can be specially designed, that is, the wind deflector can be directly integrated on the housing, and the wind deflector is used to block the vertically upward flowing oil fume airflow, so as to avoid the interference of the oil fume airflow fluctuation on the microphones and ensure the noise collection effect of the microphones.

[0052] Reference Figures 3-8 , optionally, on the basis of the above embodiment, the speaker array 32 comprises a plurality of speakers 320, and the plurality of speakers 320 are sequentially arranged and fixed on the speaker fixing frame 42; the range hood further comprises a filter screen 50, the plane where the filter screen 50 is located is parallel to the plane where the speaker fixing frame 42 is located, and the filter screen 50 is located on the side of the plurality of speakers 320 facing away from the speaker fixing frame 42 and connected with the speaker fixing frame 42.

[0053] Furthermore, the filter 50 is a detachable filter, which is detachably connected to the speaker mounting bracket 42. Specifically, this detachable filter can be a magnetic filter, which allows users to easily clean and reinstall the filter 50 via magnetic attraction.

[0054] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A range hood with an active noise reduction module, characterized in that, It includes a smoke collection chamber (10), a main unit (20) and an active noise reduction module, wherein the active noise reduction module includes a reference microphone array (31), a speaker array (32) and an error microphone array (33). The smoke collection chamber (10) is fixed below the main unit box (20) and communicates with the main unit box (20) to form an air flow channel; The reference microphone array (31) is located at the connection between the smoke collection chamber (10) and the main unit (20) inside the airflow channel. The speaker array (32) and the error microphone array (33) are arranged inside the smoke collection chamber (10) and are opposite to each other.

2. The range hood according to claim 1, characterized in that, It also includes a reference microphone mount (41) and a speaker mount (42); The reference microphone holder (41) is fixed at the connection between the smoke collection chamber (10) and the main unit (20) inside the airflow channel, and the reference microphone array (31) is fixed on the reference microphone holder (41); The loudspeaker bracket (42) is fixed inside the smoke collection chamber (10), and the loudspeaker array (32) is fixed on the loudspeaker bracket (42).

3. The range hood according to claim 2, characterized in that, The smoke machine also includes an error microphone mounting bracket (43), which is fixed on the speaker mounting bracket (42), and the error microphone array (33) is fixed on the error microphone mounting bracket (43).

4. The range hood according to claim 3, characterized in that, Both the reference microphone holder (41) and the error microphone holder (43) include a fixing plate (400) and multiple wind deflectors (410). The fixing plate (400) is parallel to the airflow direction of the air channel, and the wind deflectors (410) are perpendicular to the airflow direction of the air channel. The wind deflectors (410) are fixed on the side of the fixing plate (400) on the windward side. Both the reference microphone array (31) and the error microphone array (33) include a plurality of microphones (300) that are arranged one-to-one with the wind deflector (410). The microphones (300) are fixed on the fixed plate (400), and the projection of the microphones (300) on the corresponding wind deflector (410) along a first direction is located within the wind deflector (410); wherein, the first direction is opposite to the airflow direction of the airflow channel.

5. The range hood according to claim 2, characterized in that, The error microphone array (33) is fixed on the inner wall of the front panel of the smoke collection chamber (10).

6. The range hood according to claim 5, characterized in that, Both the reference microphone array (31) and the error microphone array (33) include multiple microphones (300). Each microphone (300) includes a housing and a microphone body located inside the housing. The housing is provided with a wind deflector (410) on the windward side, and the wind deflector (410) is perpendicular to the airflow direction of the airflow channel.

7. The range hood according to claim 2, characterized in that, The reference microphone mounting bracket (41) includes a main mounting plate (401) and two side mounting plates (402), wherein the two ends of the main mounting plate (401) in the extending direction are integrally connected to the two side mounting plates (402); The reference microphone array (31) includes a plurality of microphones (300), some of which are fixed sequentially on the main fixing plate (401) along the extension direction of the main fixing plate (401), and some of which are disposed on the side fixing plate (402).

8. The range hood according to claim 2, characterized in that, The speaker array (32) includes a plurality of speakers (320), which are arranged and fixed on the speaker mounting bracket (42) in sequence; The range hood also includes a filter screen (50), the plane of which the filter screen (50) is located is parallel to the plane of which the speaker mounting bracket (42) is located, the filter screen (50) is located on the side of the plurality of speakers (320) away from the speaker mounting bracket (42) and is connected to the speaker mounting bracket (42).

9. The range hood according to claim 8, characterized in that, The filter (50) is a detachable filter (50), and the detachable filter (50) is detachably connected to the speaker mounting bracket (42).

10. The smoke hood according to claim 1, characterized in that, The vertical distance H between the reference microphone array (31) and the speaker array (32) satisfies: 10cm≤H≤25cm.

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