Range hood suitable for active noise reduction

Abstract

The utility model discloses a range hood suitable for active noise reduction, which comprises a preset number of reference microphones, error microphones and secondary loudspeakers, and further comprises a smoke collecting cavity and two reducing plates, and a first wind noise prevention assembly for fixing the reference microphone and a second wind noise prevention assembly for fixing the error microphone. According to the range hood suitable for active noise reduction, through the two variable-diameter plates, an airflow channel in the process that airflow in the smoke collecting cavity flows from the smoke inlet to the smoke outlet is gradually reduced, the airflow is smooth, and therefore the effect of reducing turbulent noise is achieved; each microphone is protected through the wind noise prevention assembly, so that the microphones are prevented from being influenced by high temperature and wind noise; and meanwhile, the positions of the microphones and the secondary loudspeakers can be adjusted according to actual requirements, so that the optimal noise reduction effect in different environments is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of range hoods, and in particular relates to a range hood suitable for active noise reduction. Background Art

[0002] Range hoods are almost essential appliances in modern households. They can absorb the fumes generated during cooking in the kitchen to avoid harming human health. When the range hood is turned on, it will generate huge noise, which will reduce the user experience. Therefore, how to reduce the operating noise of the range hood has become an urgent problem that current range hood manufacturers need to solve. The noise of the range hood is mostly broadband noise below 1KHz, and the active noise reduction technology of the range hood is becoming more and more popular. The ANC system in the range hood consists of two parts: a controller and an acoustic device. The acoustic device is a reference microphone, a secondary speaker and an error microphone. The reference microphone collects the noise of the range hood, and the error microphone collects the residual noise. The controller obtains the optimal parameters of the system through calculation based on the signals collected by the reference microphone and the error microphone, and controls the secondary speaker to emit reverse noise to offset the noise of the range hood, thereby achieving noise reduction.

[0003] The existing patent CN 10118997102 A provides an active noise reduction device and method for a range hood, which includes a noise pickup component, a speaker component, and a controller. The active noise reduction device and method for the range hood are designed according to the structural form of the range hood and the noise generation mechanism to achieve spatial noise reduction of the range hood. However, the invention only performs active noise reduction based on the original hood form, without any structural optimization, and does not consider the impact of factors such as oil pollution and high temperature in a real kitchen on the active noise reduction system, so it is difficult to achieve an ideal noise reduction effect.

[0004] The existing patent CN 103994485 A provides an active noise reduction device for a close-suction range hood and a noise reduction method using the device. The air inlet of the range hood is divided into multiple air inlet channels, and an independent active control device is installed in each air inlet channel. Each active control device and the controller adjust the speaker output according to the noise signal and the error signal to achieve active noise reduction. The invention aims to increase the cutoff frequency of each channel to better solve the low- and medium-frequency noise. However, in actual scenes, the sounds of each air inlet channel propagate to each other and cannot be completely isolated; and the placement position of its acoustic components is fixed, which makes it difficult to adapt to various complex real kitchen environments. Utility Model Content

[0005] The purpose of the utility model is to solve the problems raised in the background technology and to provide a range hood suitable for active noise reduction.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model proposes a range hood suitable for active noise reduction, comprising a preset number of reference microphones, error microphones and secondary speakers, the range hood suitable for active noise reduction also comprising a smoke collecting chamber and two diameter reducing plates, and a first wind noise prevention component for fixing the reference microphone and a second wind noise prevention component for fixing the error microphone, wherein:

[0008] A smoke outlet is provided at the top of the smoke collecting chamber, a smoke inlet is provided at the front side of the smoke collecting chamber, each of the reducing plates is installed in the smoke collecting chamber, and two of the reducing plates are connected from two sides of the smoke inlet to two sides of the smoke outlet respectively;

[0009] The first wind noise prevention component and the second wind noise prevention component are both arranged in the smoke collecting chamber, and the first wind noise prevention component is located at the smoke outlet, and the second wind noise prevention component is located at the smoke inlet.

[0010] Preferably, the smoke collecting chamber includes an upper cover plate, a smoke baffle and a containing frame with an opening, the upper cover plate is installed on the containing frame and covers the upper half of the opening, the smoke baffle and the lower edge of the upper cover plate are hinged by a damping hinge, and when the angle of the smoke baffle is adjusted so that the smoke baffle opens outward, the smoke baffle and the containing frame form the smoke inlet.

[0011] Preferably, the accommodating frame comprises a U-shaped frame and an oil collecting box, and the oil collecting box is detachably mounted on the bottom of the U-shaped frame.

[0012] Preferably, each of the wind noise protection components includes sliders corresponding to the number of corresponding microphones, as well as a long strip and a ventilation net, and a groove opened on the back plate of the U-shaped frame. The long strip is installed on one side of the inner wall of the groove. The long strip is provided with a first sliding groove along the length direction. Each of the sliders is slidably connected to the groove and is located on the rear side of the long strip. The slider is fixed in the groove by screws that pass through the first sliding groove and the first through hole on the slider in sequence and are tightened. Each of the microphones is installed on the slider one by one. The ventilation net is connected to the back plate and covers the groove.

[0013] Preferably, a first noise reduction cotton is provided on one side of each ventilation net close to the groove.

[0014] Preferably, the range hood suitable for active noise reduction also includes a fixing component for fixing each secondary speaker, the fixing component includes a base and a support plate, the base is connected to the back plate, the support plate is vertically installed on the base, a side wall of the secondary speaker is connected to the base, and the bottom is connected to the support plate.

[0015] Preferably, a second sliding groove is provided on the base for facilitating adjustment of the installation position of the base, and the base is fixed by screws passing through the second sliding groove and the second through hole on the back plate in sequence.

[0016] Preferably, wire management grooves for accommodating wires of each microphone and secondary speaker are respectively provided on both sides of the interior of the accommodating frame, and the two wire management grooves pass through both sides of the oil collecting box.

[0017] Preferably, the range hood suitable for active noise reduction also includes a connecting hood, an upper cavity of the range hood and a fan, the connecting hood is connected to the top of the U-shaped frame and is located at the smoke outlet, the bottom of the upper cavity of the range hood is connected to the connecting hood, and the fan is installed in the upper cavity of the range hood.

[0018] Preferably, a preset number of third through holes are formed on each of the variable diameter plates, and a second noise reduction cotton is provided on one side of each of the variable diameter plates.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The range hood suitable for active noise reduction uses two reducing plates to gradually reduce the airflow channel in the smoke collecting chamber from the smoke inlet to the smoke outlet, thereby smoothing the airflow and reducing turbulent noise; each microphone is protected by a wind noise prevention component to ensure that the microphone is not affected by high temperature and wind noise; at the same time, the position of each microphone and secondary speaker can be adjusted according to actual needs to ensure the best noise reduction effect in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the range hood suitable for active noise reduction according to the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the smoke collecting chamber of the utility model;

[0023] Figure 3 This is a schematic diagram of the interior of the smoke collecting chamber of the utility model;

[0024] Figure 4 It is a schematic diagram of the assembly of the accommodating frame of the utility model;

[0025] Figure 5 It is a schematic diagram of the wind noise prevention component of the utility model;

[0026] Figure 6 For this utility model Figure 5 The enlarged view of point A in the middle;

[0027] Figure 7 A schematic diagram of a ventilation net of the utility model;

[0028] Figure 8 It is a schematic diagram of the long strip board of the utility model.

[0029] Explanation of the reference numerals in the accompanying drawings: 1. Smoke collecting chamber; 101. Upper cover plate; 102. Smoke baffle plate; 103. Accommodating frame; 104. U-shaped frame; 105. Oil collecting box; 106. Wire management groove; 2. Variable diameter plate; 3. First wind noise prevention component; 4. Second wind noise prevention component; 5. Smoke outlet; 6. Smoke inlet; 7. Sliding block; 8. Long strip plate; 9. Ventilation net; 10. Groove; 11. First slide groove; 12. Fixing component; 121. Base; 122. Support plate; 123. Second slide groove; 13. Connecting cover; 14. Upper cavity of range hood; 15. Fan. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] It should be noted that when a component is referred to as being "connected" to another component, it may be directly connected to the other component or there may be an intermediate component. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] like Figure 1-Figure 8 As shown, a range hood suitable for active noise reduction includes a preset number of reference microphones, error microphones and secondary speakers (all shown in the accompanying drawings), the range hood suitable for active noise reduction also includes a smoke collecting chamber 1 and two diameter reducing plates 2, and a first wind noise prevention component 3 for fixing the reference microphone and a second wind noise prevention component 4 for fixing the error microphone, wherein:

[0033] A smoke outlet 5 is provided at the top of the smoke collecting chamber 1, a smoke inlet 6 is provided at the front side of the smoke collecting chamber 1, each reducing plate 2 is installed in the smoke collecting chamber 1, and two reducing plates 2 are connected from both sides of the smoke inlet 6 to both sides of the smoke outlet 5;

[0034] The first wind noise protection component 3 and the second wind noise protection component 4 are both arranged in the smoke collecting chamber 1 , and the first wind noise protection component 3 is located at the smoke outlet 5 , and the second wind noise protection component 4 is located at the smoke inlet 6 .

[0035] It should be noted that Figure 1For example, after the oil smoke enters the smoke collecting chamber 1 from the smoke inlet 6, it goes out from the smoke outlet 5. In this embodiment, the two reducer plates 2 are symmetrically arranged, and the top ends of the two reducer plates 2 are fixedly connected to the two sides of the smoke outlet 5, and the bottom ends of the two reducer plates 2 are fixedly connected to the two sides of the upper edge of the smoke inlet 6. In the process of the oil smoke from the smoke inlet 6 to the smoke outlet 5, since the width of the smoke inlet 6 is greater than the width of the smoke outlet 5, the airflow outlet suddenly becomes smaller, which is very easy to generate turbulent noise. Therefore, the two reducer plates 2 are used to smooth the airflow (the two reducer plates 2 form an eight-shaped shape, so that the airflow channel gradually becomes smaller) to reduce noise; and each microphone is protected from oil pollution and wind noise through each wind noise prevention component 3. The above orientation is only for the convenience of description, and no specific orientation restriction is made.

[0036] In one embodiment, Figure 2 As shown, the smoke collecting chamber 1 includes an upper cover plate 101, a smoke baffle plate 102 and a containing frame 103 with an opening. The upper cover plate 101 is installed on the containing frame 103 and covers the upper half of the opening. The smoke baffle plate 102 is hinged to the lower edge of the upper cover plate 101 through a damping hinge, and the angle of the smoke baffle plate 102 is adjusted so that the smoke baffle plate 102 is opened outward, and the smoke baffle plate 102 and the containing frame 103 form a smoke inlet 6.

[0037] It should be noted that the opening of the accommodating frame 103 faces the front, the upper cover 101 is fixedly installed on the front side of the accommodating frame 103, and covers the upper half of the opening, the top of the smoke baffle 102 and the bottom of the upper cover 101 are hinged by a damping hinge (in this embodiment, the upper edge of the smoke baffle 102 is hinged to the lower edge of the upper cover 101 by damping hinges), and the hinged smoke baffle 102 can be adjusted in angle (when the range hood is in use, the smoke baffle 102 is opened outward, and when the range hood is not in use, the smoke baffle 102 is closed to prevent dust from entering), and the opened smoke baffle 102 and the lower half of the accommodating frame 103 form a smoke inlet 6.

[0038] In one embodiment, Figure 4 As shown, the accommodating frame 103 includes a U-shaped frame 104 and an oil collecting box 105 . The oil collecting box 105 is detachably mounted on the bottom of the U-shaped frame 104 .

[0039] It should be noted that the bottom sides of the U-shaped frame 104 are respectively provided with L-shaped bending parts (arranged oppositely, the bending parts are as shown in FIG. Figure 4 As shown in a), the structure of the oil collecting box 105 can be a groove-shaped structure, or other structures can be adopted. The oil collecting box 105 is inserted between the two bent parts to achieve the installation of the oil collecting box 105 on the U-shaped frame 104, thereby achieving quick installation and disassembly, and facilitating the cleaning of the oil collecting box 105.

[0040] In one embodiment, Figure 5-Figure 6As shown, each wind noise protection component includes sliders 7 corresponding to the number of corresponding microphones, as well as long boards 8 and ventilation nets 9, and grooves 10 opened on the back plate of the U-shaped frame 104. The long boards 8 are installed on one side of the inner wall of the grooves 10. The long boards 8 are provided with first sliding grooves 11 along the length direction. Each slider 7 is slidably connected with the grooves 10 and is located on the rear side of the long boards 8. The sliders 7 are fixed in the grooves 10 by screws passing through the first sliding grooves 11 and the first through holes on the sliders 7 and tightening them in turn. The microphones are installed on the sliders 7 one by one. The ventilation net 9 is connected to the back plate and covers the grooves 10.

[0041] It should be noted that the U-shaped frame 104 includes a back plate and three side plates, and the structure of the U-shaped frame 104 is formed by screws. The first wind noise protection component 3 is located at the upper edge of the back plate, and the second wind noise protection component 4 is located at the lower edge of the back plate. The grooves 10 in each wind noise protection component are arranged along the width direction of the back plate (horizontally penetrate), and the long strip 8 is also arranged along the width direction of the back plate and fixedly connected to the inner wall of one side of the groove 10. The slider 7 slides in the groove 10 (the number of sliders 7 in the first wind noise protection component 3 corresponds to the number of reference microphones, and each reference microphone is fixedly installed on the slider 7 in the first wind noise protection component 3 one by one, and the number of sliders 7 in the second wind noise protection component 4 corresponds to the number of error microphones, and each error microphone is fixedly installed on the second wind noise protection component 4 one by one). The slider 7 is located on the rear side of the long board 8. The long board 8 is provided with a first slide groove 11 along the length direction. Under the action of the slider 7, the microphones are driven to slide to adjust the position of each microphone (it can be adjusted according to actual needs to achieve the best noise reduction effect). After the adjustment is completed, the screws are passed through the second slide groove 11 and the through holes on the slider 7 to tighten them to fix the sliders and then fix the microphones. The ventilation net 9 is fixedly mounted on the back plate to block the groove 10. The ventilation net 9 has multiple holes. The setting of the ventilation net 9 breaks up the airflow entering the groove 10 to ensure that the microphone is not affected by wind noise. At the same time, the microphones are blocked to prevent the high temperature from affecting the microphone. Because the airflow is located between the two reducing plates 2 under the action of the two reducing plates 2, the length of the ventilation net 9 in the first wind noise prevention component 3 can be set to be exactly located between the two reducing plates 2.

[0042] In one embodiment, a first noise reduction cotton is provided on one side of each ventilated net 9 close to the groove 10. A first noise reduction cotton (i.e., sound-absorbing cotton or sound-insulating cotton) is fixedly installed on the rear side of each ventilated net 9 to help break up the airflow and improve the noise reduction effect.

[0043] In one embodiment, Figure 5As shown, the range hood suitable for active noise reduction also includes a fixing component 12 for fixing each secondary speaker, the fixing component 12 includes a base 121 and a support plate 122, the base 121 is connected to the back plate, the support plate 122 is vertically installed on the base 121, a side wall of the secondary speaker is connected to the base 121, and the bottom is connected to the support plate 122.

[0044] It should be noted that the number of fixing components 12 corresponds to the number of secondary speakers, each fixing component 12 is arranged in the horizontal direction, the base 121 is fixedly mounted on the back plate, the support plate 122 is perpendicular to the base 121 and fixedly connected to the base 121, the secondary speakers are fixedly connected to the base with side walls, and fixedly connected to the support plate with the bottom. Each secondary speaker is wrapped with an oleophobic film on the outside to avoid the influence of oil pollution.

[0045] In one embodiment, a second slide groove 123 is provided on the base 121 to facilitate adjusting the installation position of the base 121 , and the base 121 is fixed by screws passing through the second slide groove 123 and the second through hole on the back plate in sequence.

[0046] It should be noted that since the position of the second through hole on the back panel is fixed, the relative position of the screw in the second slide groove 123 is changed by moving the base 121, and then the screw passes through the second slide groove 123 and the second through hole to position the base 121, thereby adjusting the horizontal installation position of the base 121, and then adjusting the installation position of the secondary speaker, which can be adjusted according to actual needs to achieve the optimal noise reduction effect.

[0047] In one embodiment, two sides of the interior of the accommodating frame 103 are respectively provided with wire management slots 106 for accommodating wires of each microphone and the secondary speaker, and the two wire management slots 106 pass through two sides of the oil collecting box 105 .

[0048] It should be noted that two wire management grooves 106 are respectively arranged on both sides of the U-shaped frame 104 to store the wires of each microphone or secondary speaker, and the wire management groove 106 passes through the oil collecting box 105, and the wires are passed to the outside of the accommodating frame 103 to prevent the wires from being blown by the airflow and swinging arbitrarily, causing secondary noise.

[0049] In one embodiment, the range hood suitable for active noise reduction also includes a connecting hood 13, an upper cavity 14 of the range hood and a fan 15. The connecting hood 13 is connected to the top of the U-shaped frame 104 and is located at the smoke outlet 5. The bottom of the upper cavity 14 of the range hood is connected to the connecting hood 13, and the fan 15 is installed in the upper cavity 14 of the range hood.

[0050] It should be noted that the connecting cover 13 is located at the smoke outlet 5 and is fixedly connected to the top of the U-shaped frame 104. The connecting cover 13 is located in the upper cavity 14 of the range hood and the two are fixedly connected. The fan 15 is fixedly installed in the upper cavity 14 of the range hood, and the fan 15 is of small size, which is conducive to satisfying the causality of the active noise reduction system.

[0051] In one embodiment, a preset number of third through holes are provided on each variable diameter plate 2, and a second noise reduction cotton (i.e., sound-absorbing cotton or sound-insulating cotton) is provided on one side of each variable diameter plate 2. The aperture and hole spacing of the third through hole are not specifically limited, such as the aperture is 5 mm and the hole spacing is 5 mm. The second noise reduction cotton is located on the outside of the variable diameter plate 2 (i.e., the second noise reduction cotton on the left variable diameter plate 2 is located on the left side of the variable diameter plate 2, and the second noise reduction cotton on the right variable diameter plate 2 is located on the right side of the variable diameter plate 2). The thickness is not limited, such as 1 cm, and is used to absorb high-frequency noise and reduce noise.

[0052] The range hood suitable for active noise reduction uses two reducing plates to gradually reduce the airflow channel in the smoke collecting chamber from the smoke inlet to the smoke outlet, thereby smoothing the airflow and reducing turbulent noise; each microphone is protected by a wind noise prevention component to ensure that the microphone is not affected by high temperature and wind noise; at the same time, the position of each microphone and secondary speaker can be adjusted according to actual needs to ensure the best noise reduction effect in different environments.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments only express the more specific and detailed embodiments described in this application, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of this application, which all belong to the protection scope of this application. Therefore, the protection scope of the patent application shall be based on the attached claims.

Claims

1. A range hood suitable for active noise reduction, comprising a preset number of reference microphones, error microphones and secondary speakers, characterized in that: The range hood suitable for active noise reduction further comprises a smoke collecting chamber (1) and two diameter reducing plates (2), as well as a first wind noise prevention component (3) for fixing a reference microphone and a second wind noise prevention component (4) for fixing an error microphone, wherein: The top of the smoke collecting chamber (1) is provided with a smoke outlet (5), the front side of the smoke collecting chamber (1) is provided with a smoke inlet (6), each of the reducing plates (2) is installed in the smoke collecting chamber (1), and the two reducing plates (2) are respectively connected from the two sides of the smoke inlet (6) to the two sides of the smoke outlet (5); The first wind noise prevention component (3) and the second wind noise prevention component (4) are both arranged in the smoke collecting chamber (1), and the first wind noise prevention component (3) is located at the smoke outlet (5), and the second wind noise prevention component (4) is located at the smoke inlet (6).

2. The range hood suitable for active noise reduction according to claim 1, characterized in that: The smoke collecting chamber (1) comprises an upper cover plate (101), a smoke baffle plate (102) and a receiving frame (103) with an opening, wherein the upper cover plate (101) is mounted on the receiving frame (103) and covers the upper half of the opening, the smoke baffle plate (102) and the lower edge of the upper cover plate (101) are hingedly connected via a damping hinge, and when the angle of the smoke baffle plate (102) is adjusted so that the smoke baffle plate (102) is opened outward, the smoke baffle plate (102) and the receiving frame (103) form the smoke inlet (6).

3. The range hood suitable for active noise reduction according to claim 2, characterized in that: The accommodating frame (103) comprises a U-shaped frame (104) and an oil collecting box (105), and the oil collecting box (105) is detachably mounted on the bottom of the U-shaped frame (104).

4. The range hood suitable for active noise reduction according to claim 3, characterized in that: Each of the wind noise prevention components comprises sliders (7) corresponding to the number of corresponding microphones, as well as a long strip (8) and a ventilated net (9), and a groove (10) provided on the back plate of the U-shaped frame (104). The long strip (8) is installed on one side of the inner wall of the groove (10). The long strip (8) is provided with a first slide groove (11) along the length direction. Each of the sliders (7) is slidably connected with the groove (10) and is located on the rear side of the long strip (8). The slider (7) is fixed in the groove (10) by screws passing through the first slide groove (11) and the first through hole on the slider (7) and tightening them. Each of the microphones is installed on the slider (7) in a one-to-one correspondence. The ventilated net (9) is connected to the back plate and covers the groove (10).

5. The range hood suitable for active noise reduction according to claim 4, characterized in that: A first noise reduction cotton is provided on one side of each of the ventilation nets (9) close to the groove (10).

6. The range hood suitable for active noise reduction according to claim 4, characterized in that: The range hood suitable for active noise reduction further comprises a fixing assembly (12) for fixing each secondary speaker, wherein the fixing assembly (12) comprises a base (121) and a support plate (122), wherein the base (121) is connected to a back plate, and the support plate (122) is vertically mounted on the base (121), and a side wall of the secondary speaker is connected to the base (121), and a bottom is connected to the support plate (122).

7. The range hood suitable for active noise reduction according to claim 6, characterized in that: The base (121) is provided with a second sliding groove (123) for facilitating adjustment of the installation position of the base (121), and the base (121) is fixed by screws passing through the second sliding groove (123) and the second through hole on the back plate in sequence.

8. The range hood suitable for active noise reduction according to claim 2, characterized in that: Wire management grooves (106) for accommodating wires of each microphone and secondary speaker are respectively provided on both sides of the interior of the accommodating frame (103), and the two wire management grooves (106) pass through both sides of the oil collecting box (105).

9. The range hood suitable for active noise reduction according to claim 3, characterized in that: The range hood suitable for active noise reduction further comprises a connection cover (13), an upper cavity (14) of the range hood and a fan (15); the connection cover (13) is connected to the top of the U-shaped frame (104) and is located at the smoke outlet (5); the bottom of the upper cavity (14) of the range hood is connected to the connection cover (13); and the fan (15) is installed in the upper cavity (14) of the range hood.

10. The range hood suitable for active noise reduction according to claim 1, characterized in that: A preset number of third through holes are provided on each of the variable diameter plates (2), and a second noise reduction cotton is provided on one side of each of the variable diameter plates (2).

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