Noise reduction structure and range hood

Abstract

The utility model discloses a noise reduction structure and a range hood, and belongs to the technical field of kitchen appliances. The noise reduction structure comprises a perforated plate, a sound absorption cavity and a sound absorption layer, the side, close to the air channel, of the perforated plate serves as a sound wave incident face, the sound absorption layer is connected with the perforated plate, the perforated plate is used for reducing incident high-frequency sound wave energy, the sound absorption cavity is used for reducing incident low-frequency sound wave energy, and the sound absorption layer is used for reducing incident medium-high-frequency sound wave energy. Compared with the prior art, the composite noise reduction structure in the sandwich form is additionally provided with the sound absorption cavity, low-frequency noise reduction can be achieved, the low and medium frequency noise reduction effect of the noise reduction structure is improved, and therefore the use experience feeling of a user is effectively improved. The range hood disclosed by the utility model comprises a main case and the noise reduction structures, and the noise reduction structures are arranged on the two sides of the main case. According to the range hood, low-frequency noise attenuation is achieved, and the use experience feeling of a user is effectively improved.

Description

Technical Field

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

[0002] A range hood is a kitchen appliance used in every household. During the operation of the range hood, noise will be generated, which becomes an important noise source in the user's home and greatly affects the user experience.

[0003] On the one hand, the distance between the fan part of the range hood and the user is very close, and the working noise of the range hood is relatively large, resulting in a very poor intuitive experience for the user. On the other hand, due to the time difference in cooking among users in the building, during the low peak period of cooking, the resistance of the common flue is small and the exhaust is smooth; during the peak period of cooking, the resistance of the common flue is large and the smoke exhaust is difficult; the floor where the user lives also has an impact. The resistance of the common flue on high floors is small and the smoke exhaust is smooth; the resistance of the common flue on low floors is large and the smoke exhaust is difficult.

[0004] In order to ensure the smoking effect, more and more manufacturers now use variable frequency motors, which can adjust the motor speed in real time according to the change of the flue resistance. When the resistance is large, the speed is increased to ensure the smoking efficiency, but this also brings the problem of increased noise.

[0005] The main transmission path of the range hood noise is the main engine box flow channel → the smoke collecting cavity → the air inlet. At present, the main noise reduction measures of each manufacturer are to absorb or block noise by optimizing the structures such as the air duct, the impeller and the volute. The existing scheme is as Figures 1 to 3 shown. Sound absorption structures 100 are arranged on both sides of the main engine box to reduce the outward transmission of aerodynamic noise. The sound absorption structure 100 is a composite structure composed of a perforated plate 101 and a sound absorption material 102. The perforated plate 101 is on the side close to the air duct 200, and the sound absorption material 102 is on the other side. The perforated plate 101 plays a role in fixing the sound absorption material 102 on the one hand, and its perforation impedance can achieve noise reduction on the other hand. However, the medium and low frequency noise attenuation effect of this sound absorption structure 100 is not good.

[0006] Therefore, it is urgent to design a noise reduction structure and a range hood to solve the above technical problems. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a noise reduction structure and a range hood, which improve the medium and low frequency noise reduction effect.

[0008] To achieve this purpose, on the one hand, the utility model adopts the following technical solutions:

[0009] Noise reduction structure, the noise reduction structure includes a perforated plate, a sound absorption cavity and a sound absorption layer. The side of the perforated plate close to the air duct is used as the sound wave incident surface. The sound absorption layer is connected to the perforated plate. The perforated plate is used to reduce the energy of incident high-frequency sound waves, the sound absorption cavity is used to reduce the energy of incident low-frequency sound waves, and the sound absorption layer is used to reduce the energy of incident medium-high frequency sound waves.

[0010] As a preferred technical solution of the above noise reduction structure, the thickness of the perforated plate ranges from 0.6 mm to 0.8 mm.

[0011] As a preferred technical solution of the above noise reduction structure, the perforation rate of the perforated plate is 5% - 8%.

[0012] As a preferred technical solution of the above noise reduction structure, the thickness of the sound absorption layer ranges from 5 mm to 8 mm.

[0013] As a preferred technical solution of the above noise reduction structure, a limiting structure for clamping and fixing the sound absorption layer is provided on the perforated plate.

[0014] As a preferred technical solution of the above noise reduction structure, in the direction from the air duct outwards, the noise reduction structure includes a perforated plate, a sound absorption cavity and a sound absorption layer arranged in sequence. The sound absorption layer and the perforated plate are arranged at intervals, and the cavity between them is the sound absorption cavity.

[0015] As a preferred technical solution of the above noise reduction structure, in the direction from the air duct outwards, the noise reduction structure includes a perforated plate, a sound absorption layer and a sound absorption cavity arranged in sequence. The sound absorption layer and the perforated plate are attached to each other, and the cavity formed between the sound absorption layer and the decorative panel of the main engine box is the sound absorption cavity.

[0016] As a preferred technical solution of the above noise reduction structure, in the direction from the air duct outwards, the noise reduction structure includes a perforated plate, a first sound absorption cavity, a first sound absorption layer, a second sound absorption cavity and a second sound absorption layer arranged in sequence. The first sound absorption layer and the perforated plate are arranged at intervals, and the cavity between them is the first sound absorption cavity. The second sound absorption layer and the first sound absorption layer are arranged at intervals, and the cavity between them is the second sound absorption cavity.

[0017] As a preferred technical solution of the above noise reduction structure, the depths of both the first sound absorption cavity and the second sound absorption cavity are adjustable.

[0018] On the other hand, the present invention adopts the following technical solutions:

[0019] A range hood, including a main engine box, the range hood further includes the above noise reduction structure, and noise reduction structures are provided on both sides of the main engine box.

[0020] The noise reduction structure disclosed by the present utility model includes a perforated plate, a sound absorption cavity, and a sound absorption layer. The side of the perforated plate close to the air duct serves as the sound wave incident surface. The sound absorption layer is connected to the perforated plate. The perforated plate is used to reduce the energy of incident high-frequency sound waves, the sound absorption cavity is used to reduce the energy of incident low-frequency sound waves, and the sound absorption layer is used to reduce the energy of incident medium-high-frequency sound waves. This "sandwich"-type composite noise reduction structure adds a sound absorption cavity compared with the prior art, can achieve low-frequency noise reduction, and improve the noise reduction effect of the middle and low frequencies of this noise reduction structure, thereby effectively improving the user experience.

[0021] The range hood disclosed by the present utility model includes a main cabinet and the above-mentioned noise reduction structure. Noise reduction structures are provided on both sides of the main cabinet. This range hood realizes low-frequency noise attenuation and effectively improves the user experience. Description of the Drawings

[0022] Figure 1 is an installation schematic diagram of the sound absorption structure of the range hood in the prior art;

[0023] Figure 2 is a structural schematic diagram of the sound absorption structure of the range hood in the prior art;

[0024] Figure 3 is Figure 2 a cross-sectional view taken along the line A-A in

[0025] Figure 4 is a structural schematic diagram of the noise reduction structure provided in the first embodiment of the present utility model;

[0026] Figure 5 is Figure 4 a cross-sectional view taken along the line B-B in

[0027] Figure 6 is a structural schematic diagram of the perforated plate of the noise reduction structure provided in the first embodiment of the present utility model;

[0028] Figure 7 is a structural schematic diagram of the noise reduction structure provided in the second embodiment of the present utility model;

[0029] Figure 8 is Figure 7 a cross-sectional view taken along the line C-C in

[0030] Figure 9 is a structural schematic diagram of the noise reduction structure provided in the third embodiment of the present utility model;

[0031] Figure 10 is Figure 9 a cross-sectional view taken along the line D-D in.

[0032] In the figure:

[0033] 100, Sound absorption structure; 101, Perforated plate; 102, Sound absorption material; 200, Air duct;

[0034] 1, Perforated plate; 2, Sound absorption cavity; 3, Sound absorption layer; 4, First sound absorption cavity; 5, First sound absorption layer; 6, Second sound absorption cavity; 7, Second sound absorption layer;

[0035] 11, Flange; 12, Support bar; 13, Card slot. Detailed implementation manners

[0036] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the detailed implementation manners of the present utility model in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific implementation manners disclosed below.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0042] Embodiment 1

[0043] This embodiment provides an oil fume machine, which includes a main machine box, and noise reduction structures are provided on both sides of the main machine box. Compared with the prior art, the low-frequency noise attenuation effect is significantly improved, effectively improving the user experience.

[0044] As Figure 4 and Figure 5 shown, the noise reduction structure provided in this embodiment includes a perforated plate 1, a sound absorption cavity 2 and a sound absorption layer 3. The side of the perforated plate 1 close to the air duct serves as the sound wave incident surface. The sound absorption layer 3 is connected to the perforated plate 1. The perforated plate 1 is used to reduce the energy of incident high-frequency sound waves, the sound absorption cavity 2 is used to reduce the energy of incident low-frequency sound waves, and the sound absorption layer 3 is used to reduce the energy of incident medium-high-frequency sound waves.

[0045] The "sandwich"-shaped composite noise reduction structure is provided with a sound absorption cavity 2 compared with the prior art, which can achieve low-frequency noise reduction and improve the noise reduction effect of the middle and low frequencies of the noise reduction structure, thereby effectively improving the user experience.

[0046] The thickness of the perforated plate 1 ranges from 0.6 mm to 0.8 mm, such as 0.6 mm, 0.7 mm or 0.8 mm. In this embodiment, the thickness of the perforated plate 1 is selected as 0.7 mm.

[0047] The perforation rate of the perforated plate 1 ranges from 5% to 8%, such as 5%, 6%, 7% or 8%. In this embodiment, the perforation rate of the perforated plate 1 is selected as 7%. The aperture of the holes on the perforated plate 1 is 2 mm. Of course, the aperture and perforation rate of the perforated plate 1 are not limited to the above values and can be adjusted according to actual needs in actual production.

[0048] The thickness of the sound absorption layer 3 ranges from 5 mm to 8 mm, such as 5 mm, 6 mm, 7 mm or 8 mm. The specific value can be selected according to the actual situation and is not specifically limited in this embodiment.

[0049] The function of the perforated plate 1 is that on the one hand, its perforation impedance can achieve noise reduction, and on the other hand, the perforated plate 1 can also play a role in fixing the sound absorption layer 3. Specifically, the perforated plate 1 in this embodiment is provided with a limiting structure for clamping and fixing the sound absorption layer 3. The sound absorption layer 3 is connected to the perforated plate 1 through the limiting structure, and the fixing of the sound absorption layer 3 can be achieved without setting other fixing structures on the range hood.

[0050] As Figure 6 shown, the limiting structure includes a flanging 11 provided at the edge of the perforated plate 1. The flanging 11 is parallel to the mesh plate of the perforated plate 1, and the sound absorption layer 3 is limited between the mesh plate and the flanging 11. When the area of the sound absorption layer 3 is large, the middle part is prone to collapse, and it may be bent and deformed after a long time. It is difficult to ensure the assembly stability of the overall structure of the sound absorption layer 3 only by the flanging 11 structure at the edge. Therefore, the limiting structure further includes a support bar 12. The support bar 12 is arranged along the width direction of the perforated plate 1. The support bar 12 cooperates with the flanging 11 to jointly support and fix the sound absorption layer 3 and prevent the position of the sound absorption layer 3 from changing.

[0051] The number of the support bars 12 can be one, two or more. When the number of the support bars 12 is one, the support bar 12 is arranged at the middle position in the length direction of the perforated plate 1. When the number of the support bars 12 is two or more, two of the support bars 12 are respectively located at the positions close to both ends in the length direction of the perforated plate 1, and the remaining support bars 12 are evenly arranged at equal intervals between the two support bars 12.

[0052] The limiting structure in this embodiment further includes a card slot 13, which is arranged on the perforated plate 1 and used to fix the support bar 12. Specifically, one card slot 13 is provided at each end of the support bar 12, and the end of the support bar 12 is clamped in the card slot 13.

[0053] In this embodiment, in the direction from the air duct outwards, the noise reduction structure includes a perforated plate 1, a sound absorption cavity 2, and a sound absorption layer 3 arranged in sequence. The sound absorption layer 3 and the perforated plate 1 are arranged at intervals, and the cavity between the two is the sound absorption cavity 2.

[0054] Under this structure, the sound wave incident surface is the perforated plate 1, then the sound absorption cavity 2, and finally the sound absorption layer 3. The perforated plate 1 is mainly used to improve the high-frequency noise attenuation effect. The sound wave is incident into the sound absorption cavity 2, and standing wave resonance is formed in the cavity to reduce the energy of the incident low-frequency sound wave and achieve low-frequency noise reduction. The sound wave is incident into the sound absorption layer 3, and medium and high-frequency noise reduction is achieved through the friction of the porous medium.

[0055] In this embodiment, the material of the sound absorption layer 3 is a hydrophobic and oleophobic material, and its preparation method is as follows: Soak the already foamed material in distilled water to avoid the influence of impurities on the performance of the foamed material. The distilled water is mixed with a hydrophobic and oleophobic agent, and the foamed material is soaked for 24 hours. Take out the foamed material and let it dry naturally for 24 hours, and then perform vacuum drying, which can ensure the porosity of the foamed material and control the deformation.

[0056] Embodiment Two

[0057] This embodiment provides a noise reduction structure and an oil fume machine having the same. The difference between this noise reduction structure and the noise reduction structure in the first embodiment above lies in the different combination methods of the noise reduction structure. Specifically:

[0058] As Figure 7 and Figure 8 shown, in the direction from the air duct outwards, the noise reduction structure includes a perforated plate 1, a sound absorption layer 3, and a sound absorption cavity 2 arranged in sequence. The sound absorption layer 3 and the perforated plate 1 are attached to each other, and the cavity formed between the sound absorption layer 3 and the decorative panel of the main machine box is the sound absorption cavity 2.

[0059] Under this structure, the sound wave incident surface is the perforated plate 1, then the sound absorption layer 3, and finally the sound absorption cavity 2. The sound absorption layer 3 and the decorative panel of the main machine box are arranged at intervals to form the sound absorption cavity 2. The sound wave is incident into the sound absorption layer 3, and medium and high-frequency noise reduction is achieved through the friction of the porous medium. The low-frequency sound wave passes through the sound absorption layer 3 and enters the sound absorption cavity 2, and standing wave resonance is formed in the sound absorption cavity 2 to achieve low-frequency noise attenuation.

[0060] The oil fume machine provided in this embodiment includes a main machine box, and the above noise reduction structures are provided on both sides of the main machine box. Compared with the prior art, the low-frequency noise attenuation effect is significantly improved, effectively improving the user experience.

[0061] Embodiment III

[0062] This embodiment provides a noise reduction structure and a range hood having the same. The difference between this noise reduction structure and the noise reduction structure in Embodiment I above lies in the combination method of the noise reduction structure. Specifically:

[0063] As Figure 9 and Figure 10 shown, in the direction from the air duct outwards, the noise reduction structure includes a perforated plate 1, a first sound absorption cavity 4, a first sound absorption layer 5, a second sound absorption cavity 6 and a second sound absorption layer 7 arranged in sequence. The first sound absorption layer 5 and the perforated plate 1 are arranged at intervals, and the cavity between the two is the first sound absorption cavity 4. The second sound absorption layer 7 and the first sound absorption layer 5 are arranged at intervals, and the cavity between the two is the second sound absorption cavity 6.

[0064] In this structure, the sound wave incident surface is the perforated plate 1. After the standing wave resonance in the first sound absorption cavity 4, the low-frequency noise attenuation is realized. Then, the medium-high frequency noise attenuation is realized through the first sound absorption layer 5. Then, it passes through the second sound absorption cavity 6 to further realize the low-frequency noise attenuation. Finally, it is incident into the second sound absorption layer 7 to realize the high-frequency noise attenuation.

[0065] Among them, the depths of the first sound absorption cavity 4 and the second sound absorption cavity 6 are both adjustable to realize the low-frequency noise attenuation in different frequency bands.

[0066] The specific adjustment method can be but is not limited to adjusting the positions of the first sound absorption layer 5 and / or the second sound absorption layer 7 to change the depth of the first sound absorption cavity 4 and / or the depth of the second sound absorption cavity 6. Both the first sound absorption layer 5 and the second sound absorption layer 7 are connected to the perforated plate 1 through a limiting structure. By changing the connection position between the first sound absorption layer 5 and the perforated plate 1, the depth of the first sound absorption cavity 4 between the perforated plate 1 and the first sound absorption layer 5 is adjusted; by changing the connection position between the second sound absorption layer 7 and the perforated plate 1, the depth of the second sound absorption cavity 6 between the second sound absorption layer 7 and the first sound absorption layer 5 is adjusted.

[0067] The range hood provided in this embodiment includes a main cabinet, and the above noise reduction structures are provided on both sides of the main cabinet. Compared with the prior art, its low-frequency noise attenuation effect is significantly improved, effectively improving the user experience.

[0068] Note that the above is only the preferred embodiment of the present utility model and the technical principles applied. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. Noise reduction structure, characterized in that: The noise reduction structure comprises a perforated plate (1), a sound absorbing cavity (2) and a sound absorbing layer (3); the side of the perforated plate (1) close to the air duct serves as a sound wave incident surface; the sound absorbing layer (3) is connected to the perforated plate (1); the perforated plate (1) is used to reduce incident high-frequency sound wave energy; the sound absorbing cavity (2) is used to reduce incident low-frequency sound wave energy; and the sound absorbing layer (3) is used to reduce incident medium- and high-frequency sound wave energy.

2. The noise reduction structure according to claim 1, characterized in that: The thickness of the perforated plate (1) ranges from 0.6 mm to 0.8 mm.

3. The noise reduction structure according to claim 1, characterized in that: The perforation rate of the perforated plate (1) is 5%-8%.

4. The noise reduction structure according to claim 1, characterized in that: The thickness of the sound absorbing layer (3) ranges from 5 mm to 8 mm.

5. The noise reduction structure according to claim 1, characterized in that: The perforated plate (1) is provided with a limiting structure for clamping and fixing the sound absorbing layer (3).

6. The noise reduction structure according to any one of claims 1 to 5, characterized in that: In the direction outward from the air duct, the noise reduction structure comprises the perforated plate (1), the sound absorbing cavity (2) and the sound absorbing layer (3) which are arranged in sequence; the sound absorbing layer (3) and the perforated plate (1) are arranged at an interval, and the cavity between the two is the sound absorbing cavity (2).

7. The noise reduction structure according to any one of claims 1 to 5, characterized in that: In the direction outward from the air duct, the noise reduction structure comprises the perforated plate (1), the sound absorbing layer (3) and the sound absorbing cavity (2) which are arranged in sequence; the sound absorbing layer (3) and the perforated plate (1) are arranged in close contact with each other; and the cavity formed between the sound absorbing layer (3) and the main box decorative panel is the sound absorbing cavity (2).

8. The noise reduction structure according to any one of claims 1 to 5, characterized in that: In the direction outward from the air duct, the noise reduction structure comprises the perforated plate (1), a first sound absorbing cavity (4), a first sound absorbing layer (5), a second sound absorbing cavity (6) and a second sound absorbing layer (7) which are arranged in sequence, the first sound absorbing layer (5) and the perforated plate (1) are arranged at intervals, and the cavity between the two is the first sound absorbing cavity (4), the second sound absorbing layer (7) and the first sound absorbing layer (5) are arranged at intervals, and the cavity between the two is the second sound absorbing cavity (6).

9. The noise reduction structure according to claim 8, characterized in that: The depth of the first sound absorbing cavity (4) and the depth of the second sound absorbing cavity (6) are both adjustable.

10. A range hood, comprising a main chassis, characterized in that: The range hood also includes the noise reduction structure as described in any one of claims 1 to 9, and the noise reduction structure is provided on both sides of the main chassis.

Images