Sound absorption and noise reduction structure and range hood

Abstract

The utility model relates to the technical field of kitchen appliances, and discloses a sound absorption and noise reduction structure and a range hood. The sound absorption and noise reduction structure is arranged between a volute and an air guide plate in a main case and comprises a filling part and an embedding part, the space between the volute and the top face of the air guide plate is filled with the filling part, the embedding part is embedded into the air guide plate, the filling part is provided with a first oil leakage channel, and the first oil leakage channel is located below an oil leakage hole of the volute. The first oil leakage channel penetrates through the embedded part and communicates with the oil guide opening of the air guide plate. The thickness of the filling part is large enough, the sound absorption coefficient of the filling part in the low and medium frequency range can be remarkably improved, the low and medium frequency sound absorption effect of the range hood is enhanced, oil drops of the volute fall into the first oil leakage channel through the oil leakage hole of the volute and then are discharged into an oil cup of the range hood through the oil guide opening of the air guide plate, and the problems of oil leakage and oil discharge of the volute are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a sound absorption and noise reduction structure and a range hood. Background Art

[0002] As kitchen air quality requirements increase, range hoods are becoming widely used as important ventilation equipment. However, the noise problem of range hoods is also receiving increasing attention. In range hoods, a non-enclosed flow channel structure is used. When the fan is activated, negative pressure suction is generated. The smoke collection chamber collects the oil smoke, which is then sent into the fan for acceleration and exhaust. Under user operating conditions, the noise radiated from the smoke collection chamber is the highest. From the operating noise spectrum, the low- and medium-frequency frequencies below 1000Hz account for the largest proportion. The wavelength of low- and medium-frequency noise easily penetrates the sound absorption and insulation structure, affecting the surrounding environment. Therefore, how to reduce the low- and medium-frequency noise of range hoods has become a key issue in improving kitchen air quality.

[0003] In the existing range hood noise reduction technology, the main method is to set sound-absorbing materials in front and behind the fan. The arranged sound-absorbing structure needs to be a thin-walled structure, that is, it cannot occupy too much air flow channel, otherwise it will lead to loss of range hood air volume. However, the thinner sound-absorbing material mainly absorbs sound in the medium and high frequency bands, but its sound absorption effect in the low frequency range is not ideal. Utility Model Content

[0004] Based on the above problems, the purpose of this utility model is to provide a sound absorption and noise reduction structure and a range hood, which can absorb the reverberation noise in the main box, reduce the noise radiated outward when the volute is running, and enhance the mid- and low-frequency sound absorption effect of the range hood.

[0005] To achieve the above objectives, the following technical solutions are provided:

[0006] In the first aspect, the utility model provides a sound absorption and noise reduction structure, which is arranged between the volute and the air guide plate in the main box. The sound absorption and noise reduction structure includes a filling part and an embedded part. The filling part is filled between the volute and the top surface of the air guide plate, and the embedded part is embedded in the air guide plate. The filling part is provided with a first oil leakage channel, and the first oil leakage channel is located below the oil leakage hole of the volute. The first oil leakage channel runs through the embedded part, and the first oil leakage channel is connected to the oil guide port of the air guide plate.

[0007] As an optional solution to the sound absorption and noise reduction structure provided by the present invention, a second oil leakage channel is provided between the bottom surface of the embedded portion and the air guide plate, and the first oil leakage channel is connected to the oil guide port of the air guide plate through the second oil leakage channel.

[0008] As an optional solution of the sound absorption and noise reduction structure provided by the present invention, the second oil leakage channel is arranged obliquely from the front side to the rear side of the main chassis.

[0009] As an optional solution of the sound absorption and noise reduction structure provided by the present invention, a third oil leakage channel is provided between the side surface of the embedded portion and the air guide plate, and the third oil leakage channel is communicated with the second oil leakage channel.

[0010] As an optional solution to the sound absorption and noise reduction structure provided by the utility model, a support pad is provided on the side of the embedded part, and the support pad is clamped between the side of the embedded part and the air guide plate. The side of the embedded part and the air guide plate are separated to form a third oil leakage channel.

[0011] As an optional solution of the sound absorption and noise reduction structure provided by the present invention, the top surface of the filling portion opposite to the volute is an arc-shaped surface, and the bottom surface of the embedded portion opposite to the air guide plate is a trapezoid.

[0012] As an optional solution of the sound absorption and noise reduction structure provided by the present invention, the thickness of the sound absorption and noise reduction structure along the thickness direction of the volute ranges from 30 mm to 200 mm.

[0013] As an optional solution of the sound-absorbing and noise-reducing structure provided by the present invention, the sound-absorbing and noise-reducing structure is made of porous foam.

[0014] As an optional solution to the sound absorption and noise reduction structure provided by the utility model, one end of the air guide plate is fixedly connected to the main box, and the other end of the air guide plate is fixedly connected to the air duct mounting bracket, and the volute is fixedly connected to the main box through the air duct mounting bracket.

[0015] In a second aspect, the utility model further provides a range hood comprising a main housing, an air guide plate, a volute and the above-mentioned sound absorption and noise reduction structure, wherein the air guide plate, the volute and the sound absorption and noise reduction structure are all located in the main housing.

[0016] The beneficial effects of the utility model are:

[0017] The sound absorbing and noise reduction structure and the range hood provided by the utility model are provided with a sound absorbing and noise reduction structure between the volute and the air guide plate in the main box, so that the sound absorbing and noise reduction structure can absorb the reverberation noise in the main box and reduce the noise radiated outward when the volute is running. Since the filling part of the sound absorbing and noise reduction structure is filled between the volute and the top surface of the air guide plate, the thickness of the filling part is large enough, which can significantly improve its sound absorption coefficient in the medium and low frequency range, thereby enhancing the medium and low frequency sound absorption effect of the range hood. Since the embedded part of the sound absorbing and noise reduction structure is embedded in the air guide plate, it can buffer the vibration transmission between the volute and the air guide plate, and does not occupy the gas circulation channel, thereby avoiding the loss of air volume. Since the first oil leakage channel of the filling part passes through the embedded part and is connected with the oil guide port of the air guide plate, and the first oil leakage channel is located below the oil leakage hole of the volute, oil droplets of the volute fall into the first oil leakage channel through the oil leakage hole of the volute, and are then discharged into the oil cup of the range hood through the oil guide port of the air guide plate, thereby effectively solving the problem of oil leakage and oil discharge of the volute and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0019] Figure 1 This is a structural diagram of a range hood including a sound absorption and noise reduction structure provided by a specific embodiment of the utility model;

[0020] Figure 2 This is a structural diagram of the volute, wind guide plate and sound absorption and noise reduction structure provided by a specific embodiment of the utility model;

[0021] Figure 3 This is an exploded schematic diagram of the air guide plate and the sound absorption and noise reduction structure provided in a specific embodiment of the utility model;

[0022] Figure 4 It is a cross-sectional schematic diagram of the volute, wind guide plate and sound absorption and noise reduction structure provided by a specific embodiment of the present utility model.

[0023] In the picture:

[0024] 1. Filling part; 2. Embedding part; 3. First oil leakage channel; 4. Second oil leakage channel; 5. Third oil leakage channel

[0025] Oil channel; 6. Support pad;

[0026] 100. Main chassis; 200. Volute; 300. Air guide plate; 400. Air duct mounting bracket. DETAILED DESCRIPTION

[0027] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0029] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0030] like Figures 1 to 4 As shown, this embodiment provides a sound absorption and noise reduction structure, which is arranged between the volute 200 and the air guide plate 300 in the main case 100. It can not only buffer the vibration transmission between the volute 200 and the air guide plate 300 and absorb noise, but also will not occupy the air flow channel, thus avoiding affecting the air volume. The sound absorption and noise reduction structure includes a filling portion 1 and an embedded portion 2. The filling portion 1 is filled between the volute 200 and the top surface of the air guide plate 300, and the embedded portion 2 is embedded in the air guide plate 300. The filling portion 1 is provided with a first oil leakage channel 3. The first oil leakage channel 3 is located below the oil leakage hole of the volute 200. The first oil leakage channel 3 runs through the embedded portion 2, and the first oil leakage channel 3 is connected to the oil guide port of the air guide plate 300. The first oil leakage channel 3 can be a circular hole or a channel of other shapes, which is not limited here.

[0031] A sound-absorbing and noise-reducing structure is provided between the volute 200 and the air guide plate 300 within the main housing 100. The sound-absorbing and noise-reducing structure absorbs reverberant noise within the main housing 100 and reduces the noise radiated outward from the volute 200 during operation. Because the filling portion 1 of the sound-absorbing and noise-reducing structure is located between the volute 200 and the top surface of the air guide plate 300, and the thickness of the filling portion 1 is sufficiently large, the sound absorption coefficient within the low- and medium-frequency range can be significantly increased, thereby enhancing the range hood's low- and medium-frequency sound absorption effect. Because the embedded portion 2 of the sound-absorbing and noise-reducing structure is embedded within the air guide plate 300, it can buffer the vibration transmission between the volute 200 and the air guide plate 300 without occupying the gas circulation channel, thereby avoiding air volume loss. Since the first oil leakage channel 3 of the filling part 1 passes through the embedded part 2 and is connected to the oil guide port of the air guide plate 300, and the first oil leakage channel 3 is located below the oil leakage hole of the volute 200, the oil droplets of the volute 200 fall into the first oil leakage channel 3 through the oil leakage hole of the volute 200, and are then discharged into the oil cup of the range hood through the oil guide port of the air guide plate 300, which effectively solves the oil leakage and oil discharge problems of the volute 200 and improves the user experience.

[0032] Optionally, a second oil leakage channel 4 is provided between the bottom surface of the embedded portion 2 and the air guide plate 300, and the first oil leakage channel 3 is connected to the oil guide port of the air guide plate 300 through the second oil leakage channel 4. The oil droplets in the first oil leakage channel 3 are collected through the second oil leakage channel 4 and eventually flow into the oil cup. The first oil leakage channel 3 can be in a vertical direction, and the second oil leakage channel 4 can be in a slightly inclined horizontal direction. The oil droplets in the first oil leakage channel 3 are guided and buffered by the second oil leakage channel 4, thereby improving the oil discharge efficiency. The second oil leakage channel 4 can be opened on the bottom surface of the embedded portion 2, and / or opened on the inner wall of the air guide plate 300. Of course, it is also possible to form a second oil leakage channel 4 between the embedded portion 2 and the air guide plate 300, which is not limited here.

[0033] In some embodiments, the second oil leakage channel 4 is tilted from the front to the rear of the main chassis 100. To avoid interfering with the user's cooking operations, an oil cup is typically located at the rear of the main chassis 100. The second oil leakage channel 4 is tilted from the front to the rear of the main chassis 100, allowing oil droplets to flow into the oil cup under the influence of gravity. It should be understood that the front of the main chassis 100 refers to the side facing the user, and the rear of the main chassis 100 refers to the side facing the wall.

[0034] Optionally, a third oil leakage channel 5 is provided between the side of the embedded portion 2 and the air deflector 300, and the third oil leakage channel 5 is connected to the second oil leakage channel 4. The oil-water mixture on the outer wall of the volute 200 can flow downward through the third oil leakage channel 5 to the second oil leakage channel 4, ultimately flowing into the oil cup. The third oil leakage channel 5 can be provided on the side of the embedded portion 2 and / or on the sidewall of the air deflector 300. Of course, the third oil leakage channel 5 can also be formed in a space between the embedded portion 2 and the air deflector 300, and this is not limited here.

[0035] In some embodiments, support blocks 6 are provided on the sides of the embedded portion 2. Support blocks 6 are sandwiched between the sides of the embedded portion 2 and the air deflector 300. The sides of the embedded portion 2 and the air deflector 300 form a third oil leakage channel 5. Support blocks 6 effectively support the embedded portion 2, reducing the contact area between the sides of the embedded portion 2 and the air deflector 300, thereby increasing the flow area of ​​the third oil leakage channel 5. Two support blocks 6 can be provided at intervals, providing stable and reliable support.

[0036] Optionally, the top surface of the filling portion 1 facing the volute 200 is curved, and the bottom surface of the embedded portion 2 facing the air deflector 300 is trapezoidal. The curved top surface of the filling portion 1 matches the shape of the volute 200, allowing the filling portion 1 to completely fill the gap between the volute 200 and the top surface of the air deflector 300, thereby preventing turbulence and eddies from forming in this gap. The trapezoidal bottom surface of the embedded portion 2 matches the V-shape of the volute 200, while also facilitating the formation of a second oil leakage channel 4 between the embedded portion 2 and the air deflector 300.

[0037] Unlike existing sound-absorbing layer designs, the sound-absorbing and noise-reducing structure of this embodiment utilizes a thicker, three-dimensional structure. Optionally, the thickness of the sound-absorbing and noise-reducing structure along the thickness direction of the volute 200 ranges from 30 mm to 200 mm. Experimental research has shown that the thickness of the sound-absorbing material has a critical impact on its sound absorption performance. When the material is thin, increasing the thickness significantly improves the material's low-frequency sound absorption performance. In other words, appropriately increasing the thickness of the sound-absorbing material can significantly improve its sound absorption coefficient in the low- and mid-frequency ranges.

[0038] Optionally, the sound-absorbing and noise-reducing structure is made of porous foam. Porous foam is a polymer with many small pores, which are filled with other gases, giving the material a low foaming rate and high density. Porous foam is a material made of plastic particles that have been foamed, referred to as foam. Of course, the sound-absorbing and noise-reducing structure can also be made of other oil-proof and hydrophobic easy-to-form materials, such as sound-absorbing cotton. Sound-absorbing cotton is generally made of inorganic fiber materials or polymer sound-absorbing materials. It has the characteristics of high temperature tolerance, not susceptible to moisture, and not easy to age. Foam uses polyurethane as the main raw material. It is soft, easy to bend, and can be cut, but its pressure resistance is worse than that of sound-absorbing cotton. Sound-absorbing cotton has better sound absorption effect, while foam is better at sound insulation and noise reduction. Sound-absorbing cotton has a higher porosity and a wider frequency range of sound absorption, while foam has a lower porosity and is more suitable for processing low-frequency sounds.

[0039] Optionally, one end of the air deflector 300 is fixedly connected to the main chassis 100, and the other end of the air deflector 300 is fixedly connected to the air duct mounting bracket 400. The volute 200 is fixedly connected to the main chassis 100 via the air duct mounting bracket 400. The secure fixation of the air deflector 300 ensures that the sound absorption and noise reduction structure between the volute 200 and the air deflector 300 is securely installed, preventing the sound absorption and noise reduction structure from falling off or shifting.

[0040] This embodiment also provides a range hood, comprising a main case 100, an air guide plate 300, a volute 200, and the above-mentioned sound absorption and noise reduction structure, wherein the air guide plate 300, the volute 200, and the sound absorption and noise reduction structure are all located within the main case 100. A sound absorption and noise reduction structure is provided between the volute 200 and the air guide plate 300 within the main case 100. The sound absorption and noise reduction structure can absorb the reverberation noise within the main case 100 and reduce the noise radiated outward from the volute 200 during operation. Since the filling portion 1 of the sound absorption and noise reduction structure is filled between the volute 200 and the top surface of the air guide plate 300, the thickness of the filling portion 1 is large enough to significantly improve its sound absorption coefficient in the medium and low frequency range, thereby enhancing the medium and low frequency sound absorption effect of the range hood. Since the embedded portion 2 of the sound absorption and noise reduction structure is embedded in the air guide plate 300, it can buffer the vibration transmission between the volute 200 and the air guide plate 300, and does not occupy the gas circulation channel, thereby avoiding air volume loss. Since the first oil leakage channel 3 of the filling part 1 passes through the embedded part 2 and is connected to the oil guide port of the air guide plate 300, and the first oil leakage channel 3 is located below the oil leakage hole of the volute 200, the oil droplets of the volute 200 fall into the first oil leakage channel 3 through the oil leakage hole of the volute 200, and are then discharged into the oil cup of the range hood through the oil guide port of the air guide plate 300, which effectively solves the oil leakage and oil discharge problems of the volute 200 and improves the user experience.

[0041] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. A sound absorption and noise reduction structure, characterized in that: The sound absorption and noise reduction structure is arranged between the volute (200) and the air guide plate (300) in the main box (100), and the sound absorption and noise reduction structure comprises a filling portion (1) and an embedding portion (2), wherein the filling portion (1) is filled between the volute (200) and the top surface of the air guide plate (300), and the embedding portion (2) is embedded in the air guide plate (300), and the filling portion (1) is provided with a first oil leakage channel (3), wherein the first oil leakage channel (3) is located below the oil leakage hole of the volute (200), the first oil leakage channel (3) passes through the embedding portion (2), and the first oil leakage channel (3) is communicated with the oil guide port of the air guide plate (300).

2. The sound absorption and noise reduction structure according to claim 1, characterized in that: A second oil leakage channel (4) is provided between the bottom surface of the embedded portion (2) and the air guide plate (300), and the first oil leakage channel (3) is communicated with the oil guide port of the air guide plate (300) through the second oil leakage channel (4).

3. The sound absorption and noise reduction structure according to claim 2, characterized in that: The second oil leakage channel (4) is arranged obliquely from the front side to the rear side of the main box (100).

4. The sound absorption and noise reduction structure according to claim 2, characterized in that: A third oil leakage channel (5) is provided between the side surface of the embedded portion (2) and the air guide plate (300), and the third oil leakage channel (5) is communicated with the second oil leakage channel (4).

5. The sound absorption and noise reduction structure according to claim 4, characterized in that: A support pad (6) is provided on the side of the embedded portion (2), and the support pad (6) is sandwiched between the side of the embedded portion (2) and the air guide plate (300). The side of the embedded portion (2) and the air guide plate (300) are spaced apart to form the third oil leakage channel (5).

6. The sound absorption and noise reduction structure according to claim 1, characterized in that: The top surface of the filling portion (1) opposite to the volute (200) is an arc-shaped surface, and the bottom surface of the embedded portion (2) opposite to the air guide plate (300) is a trapezoid.

7. The sound absorption and noise reduction structure according to claim 1, characterized in that: The thickness of the sound absorption and noise reduction structure along the thickness direction of the volute (200) ranges from 30 mm to 200 mm.

8. The sound absorption and noise reduction structure according to claim 1, characterized in that: The sound absorption and noise reduction structure is made of porous foam.

9. The sound absorption and noise reduction structure according to claim 1, characterized in that: One end of the air guide plate (300) is fixedly connected to the main box (100), and the other end of the air guide plate (300) is fixedly connected to the air duct mounting bracket (400). The volute (200) is fixedly connected to the main box (100) via the air duct mounting bracket (400).

10. A range hood, characterized in that: The invention comprises a main box (100), an air guide plate (300), a volute (200), and a sound absorption and noise reduction structure according to any one of claims 1 to 9, wherein the air guide plate (300), the volute (200), and the sound absorption and noise reduction structure are all located in the main box (100).

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