Sound acquisition device for range hood and range hood

Abstract

The sound collection device comprises a sound collection element and further comprises a shell, the shell is provided with a sound transmission channel, the sound transmission channel comprises a first channel section and a second channel section, the first channel section and the second channel section are sequentially connected, and an included angle is formed between the first channel section and the second channel section. The sound collecting element is arranged in the first channel section, a sound inlet communicated with the second channel section is formed in the shell, an installation opening capable of being opened and closed is formed in the position, corresponding to the first channel section, of the shell, and the sound collecting element is installed in the first channel section through the installation opening. When the sound acquisition element needs to be mounted or dismounted (especially under the follow-up maintenance condition that the sound acquisition element is mounted on the range hood), the mounting opening can be opened, the sound acquisition element can be directly placed or taken down, the replacement process of the sound acquisition element is greatly facilitated, and the assembly and maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a sound acquisition device for a range hood and a range hood. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. Noise from range hoods has always been a major problem for users. Active noise cancellation, as a new noise reduction technology, is being considered for application in range hoods. Active noise cancellation devices typically include a microphone and a speaker. The microphone collects the noise generated when the range hood is operating, and the collected noise sound waves are transmitted to the controller as electrical signals. The controller analyzes and processes the signals and sends instructions to the speaker to emit sound waves that match the noise sound waves, thus neutralizing the noise and achieving a noise reduction effect. For example, Chinese invention patent application CN202010935185.0 (publication number CN111928310A) discloses such a range hood with active noise cancellation. In this range hood, the microphone is located inside the casing and arranged in an array around the fan, while the speaker assembly is located below the fan. For example, similar disclosures have been made in the application for "Rainbow Hood and Active Noise Reduction Device" with application number CN202221822214.3 and the application for "Low Noise Range Hood" with application number CN202222650354.3.

[0003] To ensure noise reduction effectiveness, existing active noise cancellation systems often place all microphones and speakers inside the duct of the range hood. However, due to the oily environment of the range hood, the microphones and speakers are often contaminated, which leads to a decrease in noise reduction effectiveness or even malfunction of the active noise cancellation system as it is used for a longer period of time. For example, Chinese invention patent application CN202210185663.X (application publication number: CN114648973A) discloses an active noise reduction device, a range hood, and an active noise reduction method. The active noise reduction device includes a sound signal acquisition device, a processor, a sound signal transmitter, a first cover, and a second cover. The processor is connected to both the sound signal acquisition device and the sound signal transmitter. Each cover forms a cavity, with an open first end and a closed second end. The sound signal acquisition device and the sound signal transmitter are located in their respective cavities, with the openings of the two cavities facing away from each other. When fluid enters any of the cavities through the opening, a pressure cloud is formed within that cavity. This pressure cloud cannot continue to exit from its closed second end, preventing subsequent fluid from flowing into the cavity from the opening. This protects the sound signal acquisition device or the sound signal transmitter within each cavity, preventing oil fumes or water vapor from contaminating or adversely affecting the device within the cavity.

[0004] However, the sound acquisition device of the active noise cancellation device in the aforementioned patent application still has certain shortcomings: First, the PCB board of the microphone assembly needs to be installed from the end opening of the first cover, and then the support frame and oleophobic and hydrophobic sound-permeable membrane are installed at the port. Similarly, during subsequent maintenance, the support frame and oleophobic and hydrophobic sound-permeable membrane need to be removed first, and then the PCB board integrating the microphone chip needs to be taken out from the port. This process of disassembling and assembling the microphone assembly is relatively cumbersome, adding an extra step to production and affecting the efficiency of production assembly. For subsequent testing and maintenance, the entire microphone assembly needs to be removed from the smoke machine, and then the PCB board needs to be taken out from the port of the first cover, which is inconvenient for replacement. Second, the sound propagation channel of the aforementioned microphone assembly is a straight tube structure. This form is not conducive to attenuating high-frequency sounds and cannot improve the accuracy of low-frequency sound acquisition. After long-term use, the sound acquisition element is also prone to oil contamination.

[0005] Therefore, the existing sound collection devices used in range hoods need further improvement. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to provide a sound acquisition device for range hoods with a convenient sound acquisition element that is easy to assemble and disassemble, in light of the current state of the technology.

[0007] The second technical problem to be solved by this utility model is to provide a range hood that applies the above-mentioned sound acquisition device, in view of the current state of the prior art.

[0008] The technical solution adopted by this utility model to solve the first technical problem is as follows: a sound acquisition device for a range hood, comprising: a sound acquisition element, and a housing, the housing having a sound propagation channel for external sound to enter therein, the sound propagation channel comprising a first channel segment and a second channel segment arranged sequentially at an angle, the sound acquisition element being disposed in the first channel segment, the housing having a sound inlet communicating with the second channel segment and an installation port that can be opened and closed at a position corresponding to the first channel segment, the sound acquisition element being able to be installed into the first channel segment through the installation port.

[0009] The aforementioned "sound inlet connected to the second channel segment" can mean that the sound inlet is opened on the housing at a position corresponding to the second channel segment, that is, the sound inlet is connected to the second open / closed segment, or the sound inlet is connected to the second channel segment through other channels or cavities.

[0010] The housing employs a curved sound propagation path design, which effectively attenuates high-frequency sounds (such as the high-frequency components of wind noise and non-target noise like those generated by the fan system) while having minimal impact on low-frequency sounds. Therefore, it is well-suited for handling low-frequency noise propagating within the acquisition device, facilitating accurate sound acquisition by the sound acquisition element. Furthermore, considering the curved sound propagation path, the sound acquisition element cannot be installed directly through the sound inlet (which would be relatively laborious). Instead, an installation port is provided on the housing of the sound acquisition device at a position corresponding to the first channel section (for placement). This allows for easy installation or removal of the sound acquisition element (especially for subsequent maintenance on an already installed range hood), greatly simplifying the replacement process and improving assembly and maintenance efficiency.

[0011] Generally, the mounting port of the housing can be opened and closed by sliding a cover plate on the housing or rotating a flap on the housing, or it can be achieved by setting a cover that can be detached from the housing. Preferably, in order to simplify the installation structure of the sound acquisition device, a detachable sealing cover installed at the mounting port is also included.

[0012] To improve the sealing performance of the sealing cap at the installation port and to reduce costs, the sealing cap is made of rubber or plastic.

[0013] To further ensure the sealing performance of the sealing cap at the mounting port and the secure installation of the sealing cap, the sealing cap is wrapped around the outer periphery of the mounting port of the housing.

[0014] Generally, the mounting opening does not need to be too large; it only needs to be large enough to easily accommodate the sound acquisition element. The sound acquisition element includes a circuit board body and a microphone chip integrated on the circuit board body. The mounting opening on the housing is designed as a strip-shaped opening that matches the shape of the circuit board body. Using a strip-shaped mounting opening that matches the shape of the circuit board body avoids poor sealing caused by an overly large mounting opening and also ensures a certain degree of reliability in the installation of the sealing cover.

[0015] As an improvement, the sound acquisition device is installed in the air duct of the range hood. Both the first channel section and the second channel section are straight channel sections, and the second channel section extends from the position where it connects with the first channel section to the position where the sound inlet is located along the flow direction of the airflow in the air duct.

[0016] The aforementioned "air duct" can be understood as any segment of the flow path from the air inlet of the fume hood of a self-suction fume extraction device (which can be a range hood or an integrated stove) to the location of the fan system. It can refer to the inner cavity space of the fume hood, the space within the fan frame where the fan system is located, or the channel structure between the fan system and the air outlet of the fume hood.

[0017] The above-mentioned "the second channel segment extends from the position where it connects with the first channel segment to the position where the sound entrance is located along the direction of airflow in the duct" can be understood as the overall extension direction of the second channel segment being consistent with or parallel to the extension direction of the duct, or it can be understood as the overall extension direction of the second channel segment having a slight tilt angle relative to the extension direction of the duct.

[0018] Considering the need for a sufficiently long channel along the sound propagation path to mitigate wind noise and reduce the impact of airflow on sound acquisition, the second channel segment is extended from its junction with the first channel segment to the sound inlet along the direction of airflow within the duct. This allows the entire acquisition device to be smaller in size perpendicular to the duct extension direction, thus occupying less space within the range hood's duct. Consequently, the wind resistance at the acquisition device's location within the duct is reduced, preventing any impact on the stability of airflow within the duct. This also reduces wind noise to some extent, further improving the accuracy of sound acquisition.

[0019] To minimize oil contamination of the sound acquisition element inside the housing, the port orientation of the first channel segment should avoid aligning with the extension direction of the second channel segment (i.e., the extension direction of the air duct). Ideally, the port orientation of the first channel segment and the extension direction of the second channel segment should be set at an angle. However, the angle between these two directions needs careful design. If the angle is too small, oil will still enter the first channel segment through its port, contaminating the sound acquisition element. If the angle is too large, the sound propagation path will bend excessively, negatively impacting sound propagation and resulting in a loss of sound pressure, hindering the accurate noise acquisition by the sound acquisition element. Therefore, the extension direction of the first channel segment is perpendicular to the extension direction of the second channel segment.

[0020] As an improvement, the sound inlet is located on the leeward side of the housing. Positioning the sound inlet at the leeward end of the housing allows the sound acquisition element to directly receive noise from within the air duct, and also significantly reduces wind noise.

[0021] As an improvement, the second channel section is also equipped with a windproof and sound-permeable component made of porous material, and an oil-proof and sound-permeable membrane is also provided at the junction of the first and second channel sections. The windproof and sound-permeable component can be made of conventional sound-absorbing cotton, which can achieve a good wind noise reduction effect, while the oil-proof and sound-permeable membrane can effectively prevent oil entering the second channel section from entering the first channel section and contaminating the sound acquisition element. The oil-proof and sound-permeable membrane can be made of polyethylene film.

[0022] The housing can be a one-piece structure, such as a one-piece bent tube structure. However, for the convenience of installing the windproof and sound-permeable components and the oil-proof and sound-permeable membrane, the housing is preferably a split structure designed to be assembled together using fasteners. Specifically, the housing includes a mounting frame and a windproof cover. The front side wall of the mounting frame has a receiving groove, and the sound acquisition element is placed in the receiving groove. The receiving groove constitutes the first channel segment. The windproof cover covers the mounting frame and defines a sound acquisition channel that communicates with the receiving groove and is located in front of the receiving groove. This sound acquisition channel constitutes the second channel segment. The leeward end of the windproof cover and the mounting frame define the sound inlet. The back of the mounting frame has a rearward protruding boss at a position corresponding to the receiving groove, and the top of the boss has the mounting opening.

[0023] To facilitate the connection and installation of the sound acquisition device with the external mounting body, the left and right sides of the mounting frame are also provided with a first connecting plate and a second connecting plate that extend to the left and right sides respectively to connect with the external mounting body.

[0024] The technical solution adopted by this utility model to solve the second technical problem is: a range hood, including a duct for the passage of smoke and an active noise reduction system disposed in the duct. The active noise reduction system includes a sound acquisition device and a speaker, and the sound acquisition device adopts the aforementioned sound acquisition device.

[0025] Compared with existing technologies, the advantages of this utility model are as follows: The sound propagation path of the housing adopts a turning path design, which can weaken high-frequency sounds (such as the high-frequency sound part in wind noise and the high-frequency sound components generated by the fan system, etc., which are non-target noises) while having little impact on low-frequency sounds. Therefore, it can be well applied to the propagation of low-frequency noise within the acquisition device, facilitating accurate acquisition by the sound acquisition element. Furthermore, considering the turning path design of the sound propagation path of the housing, the sound acquisition element cannot be directly installed through the sound inlet (which is relatively laborious). Instead, an installation port is provided on the housing of the sound acquisition device at a position corresponding to the first channel section (for placement). When it is necessary to install or remove the sound acquisition element (especially in the case of subsequent maintenance on a range hood), the installation port can be opened to directly place or remove the sound acquisition element, greatly simplifying the replacement process and improving assembly and maintenance efficiency. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the sound acquisition device according to an embodiment of the present utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of the sound acquisition device according to an embodiment of the present utility model (the sealing cover is in the removed state);

[0028] Figure 3 This is a front view of the sound acquisition device according to an embodiment of the present invention;

[0029] Figure 4 This is a vertical sectional view of the sound acquisition device according to an embodiment of the present invention;

[0030] Figure 5 for Figure 4 A schematic diagram of the structure after removing the windproof and sound-permeable components;

[0031] Figure 6 A three-dimensional structural diagram of the air duct used for sound acquisition and decoration installation. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0034] Figures 1-6 This invention illustrates a preferred embodiment of a sound acquisition device for a range hood and a range hood itself. The range hood includes a duct 50 and an active noise reduction system disposed within the duct 50. The active noise reduction system generally includes a sound acquisition device and a speaker. The sound acquisition device includes a microphone, which collects the noise generated when the range hood is operating. The collected noise sound waves are transmitted to a controller in the form of electrical signals. The controller analyzes and processes the signals and sends a command to the speaker to emit sound waves that match the noise sound waves, thereby neutralizing the noise sound waves and achieving a noise reduction effect. In this embodiment, the sound acquisition device can be used to install the aforementioned sound acquisition element 10 and provide protection against oil and wind. The sound acquisition device is an important part of the active noise reduction system and is also disposed within the duct 50 of the range hood. Taking a range hood as an example, the aforementioned "duct 50" can refer to the casing of the range hood or a box structure with a "channel" for the separate passage of fumes, such as the channel between the fan system and the fume collection hood in a ceiling-mounted range hood.

[0035] The sound acquisition device includes a sound acquisition element 10 and a housing 2. The housing 2 defines a sound propagation channel, which includes a first channel segment and a second channel segment connected sequentially. The sound acquisition element 10 is located in the first channel segment, and the second channel segment has a sound inlet 20 for external sound to enter. Both the first and second channel segments are straight channels. The sound acquisition device is generally located below the fan system, meaning that the noise generated by the fan system propagates downwards along the air duct 50, and the sound acquisition device is positioned precisely on the downward propagation path within the air duct 50. In addition to the housing 2, the sound acquisition device also includes an oil-proof sound-permeable membrane 42 and a windproof sound-permeable component 41. This embodiment uses a box with a separate "channel" for oil fumes to pass through as an example to illustrate the specific structure of the sound acquisition device; the channel inside the box serves as the air duct 50.

[0036] The housing 2 includes a mounting bracket 21 and a windproof cover 22. The mounting bracket 21 can be installed on the rear side wall of the air duct 50, and its front side wall has a receiving slot 210 for placing the sound acquisition element 10. This receiving slot 210 constitutes the first channel section of the housing 2. See also Figure 2 The mounting bracket 21 has a right-protruding boss 214 on its back side, corresponding to the aforementioned receiving groove 210. To facilitate the installation of the sound acquisition element 10, the top of the boss 214 of the mounting bracket 21 has a mounting opening 211 at a position corresponding to the receiving groove 210. The opening of the mounting opening 211 faces upwards and is located on the leeward side of the air duct 50. This facilitates the installation and removal of the sound acquisition element 10 by the operator and also reduces wind noise. The rear wall of the receiving groove 210 of the mounting bracket 21 has a forward-extending support column 2101. After the circuit board body 11 is placed in the receiving groove 210, the circuit board body 11 rests against the end of the support column 2101, thus creating a gap between the circuit board body 11 and the rear wall of the receiving groove 210 for heat dissipation. The mounting opening 211 can be opened and closed. When the mounting opening 211 is open, the sound acquisition element 10 can be inserted into the first channel section through the mounting opening 211. Specifically, the sound acquisition element 10 generally includes a circuit board body 11 and a microphone chip (not shown) integrated on the circuit board body 11, and the aforementioned mounting port 211 is designed as a strip-shaped port that matches the shape of the circuit board body 11.

[0037] A wind shield 22 is mounted on the front side of the mounting frame 21. Specifically, the wind shield 22 includes a first sidewall 221 and a second sidewall 222 arranged opposite to each other and spaced apart, and a third sidewall 223 connecting the front edge of the first sidewall 221 and the front edge of the second sidewall 222. The third sidewall 223 of the wind shield 22 is located on the front side of the receiving groove 210 of the mounting frame 21. The wind shield 22 and the front side of the mounting frame 21 form a vertically extending gap channel in the front-rear direction. The upper end of the gap channel (i.e., the end closer to the noise source) is open, and the lower end (i.e., the end away from the noise source) is closed. The gap channel is also the sound acquisition channel 23. The sound acquisition channel 23 is located on the front side of the mounting frame 21, thus constituting the second channel segment of the aforementioned housing 2. More specifically, a sound inlet 20, communicating with the aforementioned sound acquisition channel 23, is defined between the leeward end of the wind shield 22 (i.e., the section near the fan system of the range hood along the extension direction of the air duct 50) and the front side wall of the mounting bracket 21. The lower section of the sound acquisition channel 23 is opposite to the front port of the receiving groove 210 of the mounting bracket 21 in the front-rear direction. See also Figure 5In this embodiment, both the air duct 50 and the sound acquisition channel 23 extend vertically, meaning the extension direction of the sound acquisition channel 23 is consistent with the extension direction B2 of the air duct 50. Considering that if the angle between the front opening of the receiving tank 210 and the extension direction of the sound acquisition channel 23 is too small, oil will still enter the receiving tank 210 through the front port and contaminate the sound acquisition element 10. If the angle between the front port of the receiving tank 210 and the extension direction B3 of the sound acquisition channel 23 is too large, the sound propagation path will have an excessively large bend, which will adversely affect sound propagation, resulting in a loss of sound pressure and hindering the accurate noise acquisition by the sound acquisition element 10, in the preferred embodiment, the orientation of the front port of the receiving tank 210 is perpendicular to the extension direction B3 of the sound acquisition channel 23. Specifically, both the first channel section (accommodation tank 210) and the second channel section (sound acquisition channel 23) are straight channels. The second channel section extends from its connection with the first channel section to the location of the sound inlet 20 along the direction of airflow within the air duct 50. The extension directions of the first channel section and the second channel section are perpendicular.

[0038] The sound acquisition channel 23, which is used to house the windproof and sound-permeable component 41, is arranged in the extension direction of the air duct 50, and the sound propagation path has a turning design. Therefore, the size of the entire sound acquisition device in the direction perpendicular to the extension of the air duct 50 can be made smaller, that is, it occupies less space in the air duct 50 of the range hood. This results in less wind resistance at the location of the sound acquisition device in the air duct 50, so it will not affect the stability of the airflow in the air duct 50, and at the same time, it also reduces the generation of wind noise to a certain extent.

[0039] To improve the oil-proof effect, the windproof cover 22 in this embodiment can be made of plastic or metal.

[0040] The mounting bracket 21 also has a first connecting plate 212 and a second connecting plate 213 extending to the left and right sides respectively, protruding from the wind shield 22 (the first side wall 221 and the second side wall 222). At the bottom of the mounting bracket 21, there is a third connecting plate 215 extending downward and protruding from the wind shield 22 (the third side wall 223). All of the above connecting plates are connected to the side wall of the air duct 50 or the bracket inside the air duct 50 by screws.

[0041] The third sidewall 223 of the wind shield 22 has a guide surface 2230 that gradually slopes inward toward the airflow direction within the air duct 50. Specifically, the guide surface 2230 is located at the lower part of the third sidewall 223, that is, at the windward end of the third sidewall 223 within the air duct 50, and slopes forward from bottom to top. The upper part of the third sidewall 223 is basically vertically extended and is opposite to the portion of the receiving groove 210 of the mounting bracket 21 in the front-back direction. Arranging the guide surface of the wind shield 22 at a lower position also provides sufficient space within the wind shield 22 to arrange components such as the windproof and sound-permeable component 41 and the oil-proof and sound-permeable membrane 42 at the position opposite the front of the receiving groove 210.

[0042] The sound acquisition channel 23 is equipped with a windproof and sound-permeable component 41. The windproof and sound-permeable component 41 extends from the front opening of the receiving groove 210 (covering the front opening of the receiving groove 210) to the location of the sound inlet 20. The windproof and sound-permeable component 41 can be a sound-permeable component made of porous sound-absorbing material, such as polyurethane foam or melamine foam sponge, wherein the porosity of the windproof and sound-permeable component 41 is greater than 70%. In this embodiment, the windproof and sound-permeable component 41 can not only prevent airflow from impacting the oil-proof and sound-permeable membrane 42 and thus generating additional noise, but also, due to its porous material properties, can absorb high-frequency components in the sound energy, thereby achieving a filtering function for noise signals.

[0043] Since the windproof cover 22 is also correspondingly installed outside the windproof and sound-permeable component 41, it can effectively prevent high-speed oil fume airflow (airflow direction such as...) Figure 4 The hollow arrow indicates that the airflow directly impacts the windproof and sound-permeable component 41, greatly reducing the pollution of the windproof and sound-permeable component 41 by the oil fumes. At the same time, after the windproof cover 22 and the mounting bracket 21 are combined, only the upper sound inlet 20 is retained, which directly isolates the noise of the lower airflow and the noise interference of the secondary turbulence. This makes the noise entering the windproof and sound-permeable component 41 mainly come from the top, that is, the direction of the main noise source of the range hood, thus ensuring the accuracy of noise collection.

[0044] An oil-resistant and sound-permeable membrane 42 covers the front port of the receiving groove 210 of the mounting bracket 21. To facilitate the installation of the oil-resistant and sound-permeable membrane 42 and ensure its sealing after installation, an annular step is formed at the edge of the front port of the receiving groove 210, and the oil-resistant and sound-permeable membrane 42 is disposed on this annular step. To ensure the oil-resistant performance of the oil-resistant and sound-permeable membrane 42 while enabling it to effectively transmit sound waves, the oil-resistant and sound-permeable membrane 42 in this embodiment is preferably a polyethylene film. There are gaps (i.e., no contact) between the oil-resistant and sound-permeable membrane 42, the windproof and sound-permeable component 41, and the sound acquisition element 10.

[0045] Generally, the mounting port 211 of the housing 2 can be opened and closed by sliding a cover plate on the housing 2 or rotating a flap on the housing 2, or by setting a cover that can be detached from the housing 2. In a preferred embodiment, a sealing cover 30 installed at the mounting port 211 is used to seal the mounting port 211. When it is necessary to disassemble or assemble the sound acquisition element 10, the sealing cover 30 can be removed to open the mounting port 211. After the sound acquisition element 10 is installed in place, the sealing cover 30 can be installed at the mounting port 211 to close the mounting port 211 and achieve the purpose of sealing and preventing oil.

[0046] The sealing cap 30 can be made of rubber or plastic, and its top also has an upwardly extending handle 31 for easy gripping by the user. During installation, the sealing cap 30 can be wrapped around the outer periphery of the mounting opening 211 of the housing 2, such as... Figure 4 As shown, the edge of the sealing cap 30 is lower than the outer periphery of the mounting opening 211. Therefore, oil is less likely to enter the receiving groove 210 through the gap between the sealing cap 30 and the mounting opening 211, further ensuring the sealing performance of the sealing cap 30 at the mounting opening 211. Since the sealing cap 30, made of rubber or plastic, has a certain degree of deformation capability, it can fit well around the outer periphery of the mounting opening 211, improving the reliability of the sealing cap 30's installation. Furthermore, since the mounting opening 211 of the housing 2 adopts a strip-shaped opening that matches the shape of the circuit board body 11, it avoids the problem of poor sealing effect caused by the mounting opening 211 being too large, and also ensures the reliability of the sealing cap 30's installation to a certain extent.

[0047] In this embodiment, the sound propagation path of the housing 2 adopts a turning path design, which can weaken high-frequency sounds (such as the high-frequency sound part in wind noise and the high-frequency sound components generated by the fan system, etc., which are non-target noises) while having little impact on low-frequency sounds. Therefore, it is well-suited for the propagation of low-frequency noise within the acquisition device, facilitating accurate acquisition by the sound acquisition element 10. Furthermore, considering the turning path design of the sound propagation path of the housing 2, the sound acquisition element 10 cannot be directly installed through the sound inlet 20 (which would be relatively laborious). Instead, an installation port 211 is provided on the housing 2 of the sound acquisition device at a position corresponding to the first channel section (used for placement). When it is necessary to install or remove the sound acquisition element 10 (especially in the case of subsequent maintenance on a range hood), the installation port 211 can be opened to directly place or remove the sound acquisition element 10, greatly simplifying the replacement process and improving assembly and maintenance efficiency.

Claims

1. A sound acquisition device for a range hood, comprising: The sound collecting element (10) is characterized in that: further comprising a shell (2) having a sound propagation channel for external sound to enter, the sound propagation channel comprises a first channel segment and a second channel segment arranged in sequence and at an angle, the sound collecting element (10) is arranged in the first channel segment, the shell (2) is provided with a sound inlet (20) communicated with the second channel segment and an installation opening (211) capable of being opened and closed at a position corresponding to the first channel segment, and the sound collecting element (10) can be installed into the first channel segment through the installation opening (211).

2. The sound collecting device for a range hood according to claim 1, characterized in that: Further comprising a sealing cover (30) detachably installed at the installation opening (211).

3. The sound collecting device for a range hood according to claim 2, characterized in that: The sealing cover (30) is a rubber or plastic part.

4. The sound collecting device for a range hood according to claim 3, characterized in that: The sealing cover (30) is wrapped outside the outer peripheral edge of the installation opening (211) of the shell (2).

5. The sound collecting device for a range hood according to claim 1, characterized in that: The sound collecting element (10) comprises a circuit board body (11) and a microphone chip integrated on the circuit board body (11), and the installation opening (211) on the shell (2) is designed as a strip-shaped opening matched with the shape of the circuit board body (11).

6. The sound collecting device for the extractor hood according to any one of claims 1 to 5, characterized in that: The sound collecting device is arranged in an air duct (50) of a range hood, the first channel segment and the second channel segment are both straight channel segments, and the second channel segment is arranged in extension from a position where the second channel segment is connected with the first channel segment to a position where the sound inlet (20) is located along the flow direction of airflow in the air duct (50).

7. The sound collecting device for a range hood according to claim 6, characterized in that: The extension direction of the first channel segment is perpendicular to the extension direction of the second channel segment.

8. The sound collecting device for a range hood according to claim 7, characterized in that: The sound inlet (20) is located on the leeward side of the shell (2).

9. The sound collecting device for the extractor hood according to any one of claims 1 to 5, characterized in that: The second channel segment is further provided with a windproof sound-permeable part (41) made of a porous material, and the first channel segment and the second channel segment are further provided with an oil-proof sound-permeable film (42) at the connecting position.

10. The sound collecting device for a range hood according to any one of claims 1 to 5, characterized in that: The shell (2) comprises a mounting rack (21) and a wind shield (22), the front side wall of the mounting rack (21) is provided with a receiving groove (210), the sound collecting element (10) is placed in the receiving groove (210), the receiving groove (210) constitutes the first channel segment, the wind shield (22) is arranged outside the mounting rack (21) and defines a sound collecting channel (23) communicated with the receiving groove (210) and located in front of the receiving groove (210) with the mounting rack (21), the sound collecting channel (23) constitutes the second channel segment, the leeward end of the wind shield (22) and the mounting rack (21) define the sound inlet (20), and the back surface of the mounting rack (21) has a boss (214) protruding rearward at a position corresponding to the receiving groove (210), and the top of the boss (214) is provided with the installation opening (211).

11. The sound collecting device for a range hood according to claim 10, characterized in that: The left and right side portions of the mounting rack (21) are further provided with a first connecting plate (212) and a second connecting plate (213) respectively extending to the left and right sides to be connected with an external mounting body.

12. An extractor hood comprising an air duct (50) for the passage of fumes and an active noise reduction system provided in the air duct (50), the active noise reduction system comprising sound acquisition means and a loudspeaker, characterised in that: The sound collecting device adopts the sound collecting device in any one of claims 1-11.

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