Sound acquisition device and range hood

Abstract

The utility model relates to a sound acquisition device and range hood, the sound acquisition device is arranged in the air duct of the oil smoke suction device, the sound acquisition device comprises a sound acquisition element and also comprises a shell, a sound transmission channel is defined on the shell, the sound transmission channel comprises a first channel section and a second channel section which are connected in sequence and arranged at an included angle, and the first channel section and the second channel section are communicated with each other. The sound collecting element is located in the first channel section, the shell is provided with a flow guide side wall, the extending direction of the flow guide side wall is consistent with the extending direction of the air channel, and the flow guide side wall is provided with a second sound inlet allowing sound in the air channel to enter the second channel section. The device has the advantages that the oil-proof effect is good, wind can be effectively prevented to ensure that target noise signals are fully collected, and then the accuracy of sound collection is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a sound collection device and a range hood. Background Art

[0002] A range hood is a kitchen appliance for purifying the kitchen environment. The noise of the range hood has always been one of the main problems troubling users. As a new noise reduction technology, active noise reduction is also considered to be applied to the range hood for noise reduction. The active noise reduction device usually includes a microphone and a speaker, that is, the microphone collects the noise generated when the range hood is working, and the collected noise sound wave is transmitted to the controller in the form of an electrical signal. After being analyzed and processed by the controller, an instruction is sent to the speaker to control the speaker to emit a sound wave matching the noise sound wave to neutralize the noise sound wave, so as to achieve the noise reduction effect. For example, the Chinese invention patent application with the application number CN202010935185.0 (the application publication number is: CN111928310A) discloses such a range hood with an active noise reduction function. The microphone of this range hood is arranged inside the housing and surrounds the blower in an array distribution manner, and the speaker assembly is distributed below the blower. Another example is the "Range Hood and Its Active Noise Reduction Device" with the application number CN202221822214.3 and the "Low-Noise Range Hood" with the application number CN202222650354.3, which also have similar disclosures.

[0003] In order to ensure the noise reduction effect, the microphones and speakers used in the existing active noise reduction systems are often arranged inside the air duct of the range hood. However, due to the oil pollution environment of the range hood, the microphones and speakers are often contaminated, resulting in the reduction of the noise reduction effect of the active noise reduction system over time and even malfunction. For this reason, the Chinese utility model patent application with the application number CN201820250745.7 discloses an active noise reduction device for a range hood with an oil prevention device, including an input device, a central data processor and a noise reduction unit. The input device includes a microphone, and the microphone is arbitrarily installed at a place on the range hood. The noise reduction unit includes at least two noise reduction boxes, which are arranged at the bottom of the range hood volute and face the air inlet. An oil prevention device is arranged below the noise reduction box, and the oil prevention device is also arranged at the bottom of the volute and covers the noise reduction box. The oil prevention device includes a porous sound-permeable shell and an oil-proof sound-permeable film attached to the surface of the porous sound-permeable shell. At least one noise reduction speaker is arranged in the noise reduction box. The microphone and the noise reduction speaker are both connected to the central data processor. The central data processor loads a self-check module and an oil pollution detection module for the noise reduction device. The oil pollution detection module detects the oil pollution and damage condition of the oil prevention device, and the self-check module receives and processes the self-system signals reported by the device to determine whether there is an increase in the microphone and the noise reduction speaker. At the same time, a timing detection module is arranged in the self-check module.

[0004] However, the oil-proof device of the active noise reduction device in the above patent application still has certain deficiencies. The oil-proof device realizes sound transmission and oil prevention through a porous sound-permeable shell and an oil-proof film attached to the surface of the porous sound-permeable shell, without considering the influence of wind noise in the air duct of the range hood, that is, no effective wind noise prevention treatment is carried out. Especially when the opening direction of the porous sound-permeable shell faces the oncoming direction of the air flow, the wind noise is more obvious, seriously affecting the accuracy of target noise acquisition. Utility Model Content

[0005] The first technical problem to be solved by the present utility model is to provide a sound collection device with good oil-proof effect and capable of effectively preventing wind to ensure that the target noise signal is fully collected and thus ensure the accuracy of sound collection in view of the current situation of the prior art.

[0006] The second technical problem to be solved by the present utility model is to provide a range hood applying the above sound collection device in view of the current situation of the prior art.

[0007] The technical solution adopted by the present utility model to solve the first technical problem is as follows:

[0008] A sound collection device is arranged in the air duct of an oil fume extraction device and includes a sound collection element. It is characterized in that: it further includes a housing, a sound transmission channel is defined on the housing, the sound transmission channel includes a first channel section and a second channel section that are connected in sequence and arranged at an angle, the sound collection element is located in the first channel section, the housing has a diversion side wall whose extending direction is the same as the extending direction of the air duct, and a second sound inlet for the sound in the air duct to enter the second channel section is opened on the diversion side wall.

[0009] The above-mentioned "air duct" is understood as any section of the flow path from the air inlet of the smoke collecting hood of the oil fume extraction device (which can be a range hood or an integrated stove) to the position of the fan system. For example, it can refer to the inner cavity space of the smoke collecting hood, or the space inside the fan rack where the fan system is located, or the channel structure between the fan system and the air outlet of the smoke collecting hood.

[0010] As an improvement, the second channel section is arranged along the extending direction of the air duct, and the opening direction of the second sound inlet is perpendicular to the extending direction of the air duct. Arranging the second channel section in the extending direction of the air duct can make the size of the entire sound collection device in the direction perpendicular to the extending direction of the air duct smaller, that is, it occupies less space in the air duct of the oil fume extraction device, and thus the wind resistance at the position of the sound collection device in the air duct is smaller, so it will not affect the stability of the air flow in the air duct and at the same time also reduces the generation of wind noise to a certain extent.

[0011] To ensure that sufficient target noise enters the second channel segment and to reduce wind noise considerations, there are at least two second sound inlets arranged at intervals along the extending direction of the diversion side wall.

[0012] Generally speaking, the opening direction of the first sound inlet can be arranged obliquely upward, obliquely downward, or forward. Generally speaking, in order to minimize the contamination of the sound collection element on the mounting bracket by oil stains, the orientation of the first sound inlet on the mounting bracket should be avoided to be the same as the extending direction of the second channel segment, that is, the opening direction of the first sound inlet and the extending direction of the second channel segment should preferably be set at an angle. However, the angle formed between the orientation of the first sound inlet and the extending direction of the second channel segment also needs to be reasonably designed. If the angle formed between the orientation of the first sound inlet and the extending direction of the second channel segment is too small, the oil fluid will still enter the first channel segment through the first sound inlet and contaminate the sound collection element. If the angle formed between the orientation of the first sound inlet and the extending direction of the second channel segment is too large, the sound propagation path will turn too much, which will have an adverse effect on sound propagation, that is, a part of the sound pressure will be lost, which is not conducive to the accurate collection of noise by the sound collection element. Therefore, in order to better avoid the sound collection element from contacting the oil stain and to minimize the sound pressure loss caused by the excessive turning angle of the sound propagation path, the first channel segment has a first sound inlet communicating with the second channel segment, and the extension line of the opening direction of the first sound inlet is perpendicular to the extending direction of the second channel segment. This structural design enables the entire path of the noise in the air duct to enter the sound collection channel from the second sound inlet and then propagate to the position of the sound collection element in the accommodation groove to be a turning path. This turning path can prevent too much oil stain from directly passing through the sound propagation channel and contacting the sound collection element, but make most of the oil stain adhere to the side wall of the second channel segment or the windproof sound-transmitting member, thereby enabling the sound collection element to be as far away from the oil stain as possible and extending the service life of the sound collection element. On the other hand, the sound propagation path in the sound collection device adopts a turning path design, which has a weakening effect on 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., non-target noises), and has less impact on low-frequency sounds. Therefore, it can be better applied to the propagation of low-frequency noises in the sound collection device, which is conducive to the accurate collection of low-frequency noises by the sound collection element.

[0013] The housing can be designed with an integrated structure, such as a bent pipe structure with an integrated design. However, for the convenience of installing components such as the sound collection element, the housing preferably adopts a split structure design assembled together by fasteners. The housing includes a mounting frame and a wind shield. A receiving groove is formed on the front side wall of the mounting frame, and the sound collection element is placed in the receiving groove. The receiving groove constitutes the first channel section. The wind shield covers the outside of the mounting frame and defines a sound collection channel that is connected to the receiving groove and located in front of the receiving groove between the wind shield and the mounting frame. This sound collection channel constitutes the second channel section. The wind shield is constructed with the diversion side wall and the second sound inlet.

[0014] As an improvement, the wind shield extends vertically as a whole. It includes a first side wall and a second side wall that are arranged opposite and spaced apart from each other left and right, and a third side wall connected between the front side edges of the first side wall and the front side edges of the second side wall. The first side wall and the second side wall are respectively located on the left and right sides of the mounting frame. The third side wall is opposite to the mounting frame front and back, and is connected to the mounting frame at both the upper and lower ends respectively. The second sound inlets are formed on both the first side wall and the second side wall, that is, both the first side wall and the second side wall constitute the diversion side walls of the housing.

[0015] In order to achieve the connection and fixation between the mounting frame and the wind shield and to reduce the flow resistance of the housing, especially the section facing the wind, both the upper and lower ends of the mounting frame also have connection parts for connecting with the wind shield. The lower side of the third side wall of the wind shield has a lower inclined wall that slopes downward from top to bottom towards the side where the mounting frame is located and is connected to the lower connection part of the mounting frame. The upper side of the third side wall of the wind shield has an upper inclined wall that slopes downward from top to bottom towards the side where the mounting frame is located and is connected to the upper connection part of the mounting frame.

[0016] In order to further improve the anti - oil and anti - wind effects of the sound collection device, an anti - oil and sound - permeable membrane is also provided in the receiving groove, and a wind - proof and sound - permeable member is also provided in the second channel section.

[0017] As an improvement, both the sound collection channel and the air duct extend vertically.

[0018] The technical solution adopted by the present invention to solve the second technical problem is: an oil fume extractor, including an air duct for flue gas to pass through and a sound collection device provided in the air duct. The sound collection device adopts the above - mentioned sound collection device.

[0019] As an improvement, the sound collection element is a microphone.

[0020] Compared with the prior art, the advantages of the present utility model are:

[0021] First, the sound propagation channel of the sound collection device is designed as a first channel section and a second channel section arranged at an angle, and the sound collection element is placed in the first channel section of the sound collection device, which can effectively isolate the interference of external airflows on the sound collection element and prevent the oil pollution in the airflow from contaminating the sound collection element. Among them, the first channel section and the second channel section are arranged at an angle, which also makes the sound propagation channel of the sound collection device a turning path design. It has a weakening effect on high-frequency sounds (such as the high-frequency sound part in wind noise and the high-frequency sound components generated by the fan system and other non-target noises), and has little impact on low-frequency sounds. Therefore, it can be well applied to the propagation of low-frequency noises in the collection device, which is conducive to the accurate collection of low-frequency noises by the sound collection element. Considering the use of the sound collection decoration in the air duct of the oil fume extraction device, an extension wall extending along the opening direction of the second sound inlet is provided at the second sound inlet of the housing, which can form a "flow dead zone" in the corresponding inner area of the extension wall. The airflow at this part is basically stationary, and the airflow pressure fluctuation cannot be transmitted, but it does not affect the transmission of sound waves. That is, the flow dead zone can block the transmission of turbulent vortex pulsations, and at the same time make the turbulent vortex farther away from the sound collection element, reducing the transmission of airflow turbulent pulsations to the sound collection element, while the pressure pulsation of the noise is not affected, improving the accuracy of sound collection.

[0022] Secondly, a guiding side wall consistent with the extension direction of the air duct is constructed on the housing, and a second sound inlet for the sound in the air duct to enter the second channel section is opened on the guiding side wall, which can effectively reduce the flow resistance of the airflow at the position of the second sound inlet on the housing, reduce the generation of wind noise, effectively reduce the influence of the shedding vortex pressure pulsation on the noise collection of the sound collection element, and improve the accuracy of sound collection. Description of the Drawings

[0023] Figure 1 Schematic perspective view of the sound collection device according to an embodiment of the present utility model;

[0024] Figure 2 Exploded view of the sound collection device according to an embodiment of the present utility model;

[0025] Figure 3 Vertical sectional view of the sound collection device according to an embodiment of the present utility model;

[0026] Figure 4 is Figure 3 Schematic structural view after removing the windproof sound-permeable part;

[0027] Figure 5 Schematic perspective view of the sound collection device according to an embodiment of the present utility model installed in the air duct. Detailed Description of the Invention

[0028] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0029] In the description and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention. However, these terms are used herein only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions should be regarded as illustrative rather than restrictive. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity.

[0030] Figures 1 - 5 A preferred embodiment of the sound collection device and the range hood of the present invention is shown.

[0031] The sound collection device 4 includes a sound collection element 11 and a housing 2. A sound propagation channel is defined on the housing 2. Among them, the sound propagation channel includes a first channel segment and a second channel segment connected in sequence. Among them, the sound collection element 11 is located in the first channel segment. The first channel segment has a first sound inlet 211 communicating with the second channel segment. The second channel segment has a second sound inlet 45 for external sound to enter therein. The extension line of the opening direction of the first sound inlet 211 intersects with the extension line of the opening direction of the second sound inlet 45.

[0032] The active noise reduction system is usually arranged in the air duct 10 of a range hood device (such as a range hood or a kitchen appliance such as an integrated stove with a range hood function). The sound collection device is an important part of the active noise reduction system and is also correspondingly arranged in the air duct 10 of the range hood device. Taking the range hood as an example, the above-mentioned "air duct" can refer to the casing of the range hood or a box structure with a "channel" for the oil fume to pass through alone, such as the channel between the fan system and the smoke collecting hood of a ceiling-mounted range hood. The active noise reduction system generally includes a sound collection element 11 (microphone) and a speaker. That is, the microphone collects the noise generated when the range hood works. The collected noise sound wave is transmitted to the controller in the form of an electrical signal. After being analyzed and processed by the controller, an instruction is sent to the speaker to control the speaker to emit a sound wave matching the noise sound wave to neutralize the noise sound wave, thereby achieving the effect of noise reduction. The sound collection device of the present embodiment can be used to install the above-mentioned sound collection element 11 and provide protection against oil and wind.

[0033] The sound collection device 4 is generally located below the fan system, that is, the noise generated by the fan system propagates downward along the air duct 10, and the sound collection device is exactly arranged on the downward propagation path in the air duct 10. In addition to the housing, the sound collection device 4 further includes an oil-proof sound-permeable membrane 28 and a wind-proof sound-permeable member 30. The housing includes a mounting frame 20 and a wind-proof cover 40.

[0034] In this embodiment, taking the box body 1 with a "channel" for the separate passage of oil fume as an example, the specific structure of the sound collection device will be described. The channel in the box body 1 serves as the air duct 10. The mounting frame 20 can be mounted on the rear side wall of the air duct 10, and a receiving groove 21 for placing the sound collection element 11 is provided on its front side wall. The receiving groove 21 constitutes the first channel section of the above-mentioned housing 2. The front part of the receiving groove 21 has an opening as the first sound inlet 211 for sound to enter the receiving groove 21.

[0035] The mounting frame 20 is vertically arranged, and both its upper and lower ends are connected to the side wall of the air duct 10 by screws. On the front side of the mounting frame 20, connection parts 260 for connecting with the wind-proof cover are also provided near its upper and lower ends. Specifically, connection columns extending forward are provided on both the upper and lower connection parts of the mounting frame, and the wind-proof cover 40 can be connected to the connection columns of the mounting frame 20 by screws 50.

[0036] The wind-proof cover 40 includes a first side wall 411 and a second side wall 412 that are relatively arranged left and right and spaced apart, and a third side wall 413 connected between the front side edges of the first side wall 411 and the second side wall 412. The third side wall 413 of the wind-proof cover 40 is located on the front side of the receiving groove 21 of the mounting frame 20 and is opposite to the first sound inlet 211 on the mounting frame 20. The first side wall 411 and the second side wall 412 of the wind-proof cover are respectively connected to the left and right side walls of the mounting bracket. The upper and lower ends of the third side wall 413 of the wind-proof cover 40 respectively have an upper inclined wall 4132 and a lower inclined wall 4131 that are inclined towards the two connection parts 260 of the mounting frame 20. Specifically, the lower inclined wall 4131 is inclined downward and toward the side where the lower connection part 260 of the mounting frame 20 is located and is connected to the connection part 260. The upper inclined wall 4132 is inclined upward and toward the side where the upper connection part 260 of the mounting frame 20 is located and is connected to the connection part 260. Thus, a sound collection channel arranged along the extension direction of the air duct 10 is formed between the mounting frame 20 and the wind-proof cover 40, and the sound collection channel 200 is closed at both the upper and lower ends. The lower inclined wall of the wind-proof cover 40 faces the oncoming flow direction of the air flow in the air duct 10, and it can serve as a guiding surface that gradually inclines toward the inside of the air duct 10 along the air flow direction in the air duct 10 (such as Figure 3 the direction indicated by the hollow arrow in the figure), which can effectively reduce the air flow resistance.

[0037] To improve the anti-oil pollution effect, the wind deflector 40 in this embodiment can be made of plastic or metal parts.

[0038] The sound collection channel 200 formed between the wind deflector 40 and the front side of the mounting bracket 20 in this embodiment also constitutes the second channel section of the above-mentioned housing 2. Second sound inlets 45 for the sound in the air duct 10 to enter the second channel section are provided on both the first side wall 411 and the second side wall 412 of the wind deflector 40. The opening direction of the second sound inlet (45) is perpendicular to the extending direction of the air duct 1, that is, both the first side wall 411 and the second side wall 412 constitute the flow guiding side walls of the housing 2.

[0039] The opening direction of the first sound inlet 211 intersects with the extending direction B3 of the sound collection channel 200 to form a first included angle M. Considering that if the included angle formed between the orientation B1 of the first sound inlet 211 and the extending direction B3 of the sound collection channel 200 is too small, the oil fluid will still enter the accommodation groove 21 through the first sound inlet 211 to contaminate the sound collection element 11. If the included angle formed between the orientation B1 of the first sound inlet 211 and the extending direction B3 of the sound collection channel 200 is too large, the sound propagation path will turn too much, which will have an adverse effect on sound propagation, that is, a part of the sound pressure will be lost, and it is not conducive to the accurate collection of noise by the sound collection element. Therefore, in this embodiment, the opening direction B1 of the first sound inlet 211 faces forward and is perpendicular to the extending direction B3 of the sound collection channel 200, that is, the value of the above-mentioned first included angle M is 90°. In this way, the noise in the air duct 10 can enter the sound collection channel 200 from the second sound inlet 45 and then propagate to the position of the sound collection element 11 in the accommodation groove 21, and the entire sound propagation path is a turning path. This turning path can prevent too much oil stain from directly passing through the sound collection channel 200 and contacting the sound collection element 11, but make most of the oil stain adhere to the side wall of the sound collection channel 200 or the windproof sound-transmitting member 30, so that the sound collection element 11 can be as far away from the oil stain as possible, and the service life of the sound collection element 11 is prolonged. On the other hand, considering that the target noise (mainly from the fan system) that the active noise reduction system needs to collect is low-frequency noise, and the sound propagation path in the sound collection device adopts a turning path design, which has a weakening effect on high-frequency sounds (such as the high-frequency sound part of the wind noise and the high-frequency sound components generated by the fan system and other non-target noises), and has little impact on low-frequency sounds. Therefore, it can be better applied to the propagation of low-frequency noise in the sound collection device, which is conducive to the accurate collection of the low-frequency noise by the sound collection element 11. The main reason is that the wavelength of low-frequency noise is longer, and it can better adapt to the bending and irregular shapes of the pipeline. When low-frequency noise propagates in a bent pipeline, due to its longer wavelength, it is not easily blocked and reflected by the pipeline, so it can better propagate and spread. While the wavelength of high-frequency noise is shorter, it is easily reflected and absorbed by the shape and bending of the pipeline, so it is more difficult to propagate and spread in the pipeline than low-frequency noise.

[0040] After the windproof cover 40 is provided, it can effectively prevent the high-speed oil fume airflow from directly impacting the windproof sound-transmitting member 30, greatly reducing the pollution of the oil fume to the windproof sound-transmitting member 30. At the same time, after the windproof cover 40 is combined with the mounting rack 20, only the second sound inlet 45 in the upper part is reserved, directly isolating the noise interference of the lower airflow noise and the secondary turbulent flow, so that the noise entering the windproof sound-transmitting member 30 mainly comes from above, that is, the direction of the main noise source of the range hood, thus ensuring the accuracy of noise collection.

[0041] Since the sound collection element 11 is installed in the accommodation groove 21 of the mounting bracket 20 and a windproof cover 40 is provided outside the mounting bracket 20, it is possible to effectively isolate the interference of the airflow in the air duct 10 on the sound collection element 11, prevent the oil stain in the airflow from contaminating the sound collection element 11, and at the same time, a windproof and sound-transmitting member 30 is provided in the sound collection channel formed between the mounting bracket 20 and the windproof cover 40, which can effectively reduce the influence of wind noise. Even if a small amount of airflow enters the sound collection channel 200, the pressure pulsation can be weakened in the windproof and sound-transmitting member 30, thereby reducing the influence on the sound collection accuracy of the microphone. Considering that a windproof and sound-transmitting member 30 with a sufficient length needs to be provided on the sound propagation path to prevent wind noise, so as to reduce the influence of the airflow in the air duct 10 on sound collection, in this embodiment, the sound collection channel 200 for placing the windproof and sound-transmitting member 30 is arranged in the extending direction of the air duct 10. Therefore, the size of the entire sound collection device in the direction perpendicular to the extending direction of the air duct can be made smaller, that is, it occupies less space in the air duct 10 of the range hood, and further makes the wind resistance at the position where the sound collection device is located in the air duct 10 smaller. Therefore, it will not affect the stability of the airflow in the air duct 10 and at the same time reduces the generation of wind noise to a certain extent.

[0042] The oil-proof and sound-transmitting film 28 covers the first sound inlet 211 of the accommodation groove 21 of the mounting bracket 20, specifically at the position of the edge of the front opening of the accommodation groove 21 of the mounting bracket 20. More specifically, in order to facilitate the installation of the oil-proof and sound-transmitting film 28 and ensure its sealing performance after installation, an annular step portion 210 is further formed at the edge position of the first sound inlet 211 of the accommodation groove 21, and the oil-proof and sound-transmitting film 28 is arranged on the annular step portion 210. In order to ensure the oil-proof performance of the oil-proof and sound-transmitting film 28 and enable it to effectively transmit sound waves, the oil-proof and sound-transmitting film 28 of this embodiment is preferably a polyethylene film. There is a spacing between the oil-proof and sound-transmitting film 28 and the sound collection element 11.

[0043] In order to effectively slow down the air flow and eliminate the air flow impact, the windproof sound transmission member 30 is a sleeve member made of porous sound-absorbing material. For example, the windproof sound transmission member 30 can be made of polyurethane foam, melamine foam sponge, etc. Among them, the porosity of the windproof sound transmission member 30 is greater than 70%. The windproof sound transmission member 30 of this embodiment can not only prevent the air flow from impacting the oil-proof sound transmission film 28 and generating additional noise, but also, due to the property of its porous material itself, can absorb the high-frequency components in the sound energy and realize the filtering function of filtering the noise signal. Specifically, the front side wall of the windproof sound transmission member 30 is attached to the rear side wall of the third side wall 413 of the windproof cover 40, so that the windproof sound transmission member 30 is in a compressed state. By compression, the material density can be increased, and the possibility of the penetration of the air flow pressure pulsation can be effectively reduced, thereby further improving the windproof effect. In order to prevent the oil-proof sound transmission film 28 from contacting the windproof sound transmission member 30 and affecting the sound transmission effect here, there is also a distance between the oil-proof sound transmission film 28 and the windproof sound transmission member 30.

[0044] After installing the sound collection element 11 in the accommodation groove 21 of the installation frame 20 in this embodiment, an oil-proof sound transmission film 28 is provided at its first sound inlet 211, a windproof sound transmission member 30 is provided outside it, and a windproof cover 40 is provided outside the windproof sound transmission member 30. This kind of sound collection device adopts the above three-layer protection to effectively eliminate the wind noise and achieve the purpose of preventing oil pollution.

[0045] This embodiment also relates to a range hood, which includes a flue 10 for the flue gas to pass through and an active noise reduction system provided in the flue 10. The active noise reduction system includes the above-mentioned sound collection device.

Claims

1. A sound collection device is disposed in the air duct (10) of an oil fume suction device and includes a sound collection element (11), characterized in that: It further includes a housing (2) on which a sound propagation channel is defined. The sound propagation channel includes a first channel section and a second channel section that are sequentially connected and arranged at an angle. The sound collection element (11) is located in the first channel section. The housing (2) has a guiding side wall whose extending direction is the same as that of the air duct (10), and a second sound inlet (45) is provided on the guiding side wall for the sound in the air duct (10) to enter the second channel section.

2. The sound collection device according to claim 1, wherein: The second channel section is arranged along the extending direction of the air duct (10), and the opening direction of the second sound inlet (45) is perpendicular to the extending direction of the air duct (10).

3. The sound collection device according to claim 2, characterized in that: There are at least two second sound inlets (45) that are sequentially arranged at intervals along the extending direction of the guiding side wall.

4. The sound collection device according to claim 1, characterized in that: The first channel section has a first sound inlet (211) communicating with the second channel section, and the extension line of the opening direction of the first sound inlet (211) is perpendicular to the extending direction of the second channel section.

5. The sound collection device according to any one of claims 1 to 4, characterized in that: The housing (2) includes a mounting frame (20) and a wind shield (40). A receiving groove (21) is provided on the front side wall of the mounting frame (20). The sound collection element (11) is placed in the receiving groove (21), and the receiving groove (21) constitutes the first channel section. The wind shield (40) covers outside the mounting frame (20), and a sound collection channel (200) that is connected to the receiving groove (21) and is located in front of the receiving groove (21) is defined between the wind shield (40) and the mounting frame (20). The sound collection channel (200) constitutes the second channel section. The guiding side wall and the second sound inlet (45) are constructed on the wind shield (40).

6. The sound collection device according to claim 5, characterized in that: The wind shield (40) extends vertically as a whole. It includes a first side wall (411), a second side wall (412) that are arranged opposite and spaced from each other left and right, and a third side wall (413) connected between the front side edges of the first side wall (411) and the second side wall (412). The first side wall (411) and the second side wall (412) are respectively located on the left and right sides of the mounting frame (20). The third side wall (413) is opposite to the mounting frame (20) front and back, and is connected to the mounting frame (20) at the upper and lower ends respectively. The second sound inlet (45) is provided on both the first side wall (411) and the second side wall (412), that is, both the first side wall (411) and the second side wall (412) constitute the guiding side wall of the housing.

7. The sound collection device according to claim 6, wherein: Both the upper and lower ends of the mounting bracket (20) further have connecting portions (260) for connecting to the wind shield (40). The lower side of the third side wall (413) of the wind shield (40) has a lower inclined wall (4131) that slopes downward from top to bottom toward the side where the mounting bracket (20) is located and is connected to the connecting portion on the lower side of the mounting bracket (20). The upper side of the third side wall (413) of the wind shield (40) has an upper inclined wall (4132) that slopes downward from top to bottom toward the side where the mounting bracket (20) is located and is connected to the connecting portion (260) on the upper side of the mounting bracket (20).

8. The sound collection device according to claim 5, wherein: An oil-proof sound-transmitting membrane (28) is further provided in the accommodation groove (21), and a wind-proof sound-transmitting member (30) is further provided in the second channel section.

9. The sound collection device according to claim 5, wherein: Both the sound collection channel (200) and the air duct (10) extend vertically.

10. A range hood, comprising an air duct (10) for flue gas to pass through and a sound collection device provided in the air duct (10), characterized in that: The sound collection device described above uses the sound collection device according to any one of claims 1 to 9.

11. The range hood according to claim 10, wherein: The sound collection element (11) described above is a microphone.

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