Sound absorption unit, sound absorption module and range hood

Abstract

The utility model relates to the field of range hoods, and provides a sound absorption unit, a sound absorption module and a range hood. The sound absorption unit comprises a 1 / 4 wavelength pipe, a sound absorption cavity is formed in the 1 / 4 wavelength pipe, one end of the 1 / 4 wavelength pipe is open, the other end of the 1 / 4 wavelength pipe is closed, a plurality of small holes communicated with the sound absorption cavity and the outside are formed in the open end, and the width of each small hole is larger than 2 mm. According to the sound absorption unit provided by the utility model, the plurality of small holes are formed in the 1 / 4 wavelength tube, and the width of each small hole is greater than 2mm, so that the sound absorption unit can effectively reduce noise, meanwhile, the structural volume of the sound absorption unit is smaller, oil stains can be prevented from blocking the small holes, and the noise reduction failure of the sound absorption unit is avoided.

Description

Technical Field

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

[0002] In the related art, a sound absorbing module composed of a sound absorbing unit is placed in the cavity where the volute is located in the range hood to absorb and reduce the noise of the range hood. However, when the range hood is used for a long time, oil stains will form on the sound absorbing module, and these oil stains will block the small holes on the sound absorbing unit, making the sound absorbing unit lose the effect of reducing the noise of the range hood. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides a sound absorbing unit to prevent the small holes of the sound absorbing unit from being blocked by oil stains.

[0004] The utility model provides a sound absorbing unit, comprising:

[0005] A 1 / 4 wavelength tube having a sound absorbing cavity formed therein, wherein one end of the 1 / 4 wavelength tube is open and the other end is closed;

[0006] The open end of the 1 / 4 wavelength tube is provided with a plurality of small holes connecting the sound absorbing cavity and the outside, and the widths of the plurality of small holes are respectively greater than 2 mm.

[0007] According to the sound absorbing unit proposed by the utility model, a plurality of small holes are arranged in the 1 / 4 wavelength tube, and the width of the small holes is greater than 2 mm. Thus, the sound absorbing unit can effectively reduce noise while making the structural volume of the sound absorbing unit smaller, and can also prevent oil stains from clogging the small holes, thereby avoiding noise reduction failure of the sound absorbing unit.

[0008] According to an embodiment of the present invention, the width of the small hole is 2mm-4mm.

[0009] According to one embodiment of the present invention, a plurality of said small hole arrays are provided.

[0010] According to an embodiment of the utility model, a perforated plate is provided at the open end, the small holes are provided on the surface of the perforated plate, and the thickness of the perforated plate is 1 mm-3 mm.

[0011] The utility model also provides a sound absorbing module, comprising a plurality of different sound absorbing units mentioned above, wherein the plurality of sound absorbing units are arranged side by side.

[0012] The sound absorbing module proposed in the present invention includes the above-mentioned sound absorbing unit and thus has the effect of the above-mentioned sound absorbing unit, which will not be described in detail here.

[0013] According to an embodiment of the present invention, the sound absorbing unit is L-shaped, straight-strip-shaped or 180° folded.

[0014] According to an embodiment of the present invention, at least two of the straight strip-shaped sound absorbing units of different lengths form a step, and at least one of the L-shaped units is complementary to the step.

[0015] According to an embodiment of the present invention, at least one of the L-shaped sound absorbing units is arranged side by side with the 180-degree foldable sound absorbing unit, and at least two of the 180-degree foldable sound absorbing units are arranged side by side.

[0016] According to an embodiment of the present invention, the sound absorbing module is rectangular.

[0017] The utility model also provides a range hood, comprising:

[0018] case;

[0019] a volute, the volute being disposed in the housing;

[0020] The above-mentioned sound absorbing module is arranged in the dead zone of the flow field formed by the airflow in the shell.

[0021] The range hood proposed in the utility model includes the above-mentioned sound absorbing module and thus also has the beneficial effects of the above-mentioned sound absorbing module, which will not be described in detail here.

[0022] According to an embodiment of the utility model, there are multiple sound absorbing modules, and the multiple sound absorbing modules are arranged on both sides of the volute, or are arranged around the volute.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 is a cross-sectional view of the sound absorbing unit provided by the utility model;

[0026] Figure 2 is a cross-sectional view of the sound absorbing module provided by the utility model;

[0027] Figure 3This is a rear view of the sound absorbing module provided by the utility model;

[0028] Figure 4 It is a partial structural schematic diagram of the range hood provided by the utility model;

[0029] Reference numerals:

[0030] 10. Range hood; 11. Volute; 12. Sound absorption module;

[0031] 120. Sound absorbing unit; 121. 1 / 4 wavelength tube; 122. Sound absorbing cavity; 123. Small hole; 124. Perforated plate. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0033] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0035] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean 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", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] In the related art, the range hood will generate noise, and the main noise source of the range hood comes from the volute. Therefore, a sound absorption module is placed in the cavity where the volute is located. However, after the range hood is used for a long time, oil will accumulate on the wall of the cavity where the volute is located, and some of the oil will accumulate on the surface of the sound absorption module, thereby blocking the small holes on the sound absorption module, reducing the noise reduction ability of the sound absorption module or even losing its noise reduction effect.

[0038] like Figure 1 As shown, the present invention provides a sound absorbing unit 120, including a 1 / 4 wavelength tube 121. It should be noted that the sound absorbing unit 120 can be applied to the above-mentioned sound absorbing module, which is placed in the range hood 10 to absorb sound and reduce noise of the range hood 10.

[0039] Specifically, a sound absorbing cavity 122 is formed inside the 1 / 4 wavelength tube 121, and one end of the 1 / 4 wavelength tube 121 is open and the other end is closed. The open end of the 1 / 4 wavelength tube 121 is provided with a plurality of small holes 123 connecting the sound absorbing cavity 122 and the outside. When the range hood 10 is working, sound waves enter the sound absorbing cavity 122 from the small holes 123, wherein the sound waves of the noise are absorbed by the 1 / 4 wavelength tube 121 after multiple reflections and resonances in the sound absorbing cavity 122, thereby achieving the effect of noise reduction. In addition, when the volume of the sound absorbing cavity 122 is the same, by providing a plurality of small holes 123 on the 1 / 4 wavelength tube 121, the sound absorbing frequency of the 1 / 4 wavelength tube 121 can also be reduced, so that the sound absorbing unit 120 can absorb lower frequency noise.

[0040] The width of the plurality of small holes 123 is greater than 2 mm. When the oil is flowing, its flow in the small holes 123 will be affected by surface tension. Surface tension is the mutual attraction between liquid molecules, which will make the liquid minimize its surface area. When the diameter of the small holes 123 is large, such as greater than 2 mm, the surface tension of the oil is not enough to make the liquid completely fill and block the small holes 123.

[0041] In addition, the flow of oil in the small hole 123 is also affected by capillary action. Capillary action is due to the mutual attraction between the liquid and the wall of the small hole 123, which enables the liquid to rise or fall in the small hole 123. When the diameter of the small hole 123 is large, the influence of capillary action is small, and the liquid is not easy to rise in the small hole 123, so it is not easy to block the small hole 123. Therefore, the width of the small hole 123 is greater than 2mm, which can effectively prevent oil from blocking the small hole 123 and ensure the normal operation of the sound absorbing unit 120.

[0042] The sound absorbing unit 120 of the embodiment of the utility model is provided with a plurality of small holes 123 on the 1 / 4 wavelength tube 121, and the width of the small holes 123 is greater than 2 mm. Thus, the sound absorbing unit 120 can effectively reduce noise while making the structure volume of the sound absorbing unit smaller, and can also prevent oil stains from clogging the small holes 123, thereby avoiding noise reduction failure of the sound absorbing unit 120.

[0043] like Figure 1As shown, in one embodiment of the utility model, the width of the small hole 123 is 2mm-4mm, for example, the width of the small hole 123 can be 3mm. Wider small holes 123 can absorb low-frequency sound waves more effectively. In acoustics, low-frequency sound waves have longer wavelengths. By adjusting the width of the small holes 123, the absorption capacity of the sound-absorbing unit 120 for these low-frequency sound waves can be optimized, so that the noise reduction effect of the sound-absorbing unit 120 in the lower frequency band is better. In addition, within the range of 2mm to 4mm, the small holes 123 are large enough that oil stains are not easy to completely block these holes. Such a size can reduce maintenance problems caused by oil stain accumulation while maintaining the sound absorption effect. When the size of the small hole 123 is large, even if partial blockage occurs, it is easier to remove the oil stains by conventional cleaning means, thereby maintaining the performance of the sound-absorbing unit 120.

[0044] like Figure 1 As shown, in one embodiment of the present invention, a plurality of small holes 123 are arranged in an array, and the number of small holes 123 is 4-36, for example, the number of small holes 123 can be 16. In this way, through the reasonable distribution of a plurality of small holes 123, sound waves can enter the sound absorption cavity 122 from different positions, increasing the contact area between the sound wave and the sound absorption material, thereby improving the sound absorption efficiency. The plurality of small holes 123 can make the sound wave experience more reflections and resonances in the sound absorption cavity 122, thereby enhancing the sound absorption effect.

[0045] like Figure 1 and Figure 3 As shown, in one embodiment of the utility model, a perforated plate 124 is provided at the opening end, and small holes 123 are provided on the surface of the perforated plate 124, and the thickness of the perforated plate 124 is 1 mm-3 mm. For example, the thickness of the perforated plate 124 can be 2 mm, which can affect the absorption frequency of the sound waves by the sound absorbing unit 120 to a certain extent, making it more adaptable to a specific noise environment.

[0046] The perforated plate 124 can enhance the overall structural strength of the sound absorbing unit 120, making it more stable and durable. Especially in environments such as kitchens, the sound absorbing unit 120 may be affected by various factors such as oil smoke, steam, and heat. The setting of the perforated plate 124 can improve the pressure resistance and heat resistance of the sound absorbing unit 120. In addition, the small holes 123 are set on the surface of the perforated plate 124, which can prevent oil stains from directly entering the sound absorbing cavity 122, reduce the pollution of oil stains to the inside of the sound absorbing unit 120, and extend the service life of the sound absorbing unit 120.

[0047] Of course, the configuration of the perforated plate 124 is not limited thereto. In other embodiments of the present invention, the perforated plate 124 may cover one side of the 1 / 4 wavelength tube 121 to further enhance the overall structural strength of the sound absorbing unit 120 .

[0048] In one embodiment of the present invention, the perforated plate 124 is detachably connected to the open end, so that after the range hood 10 is used for a long time, the perforated plate 124 can be removed and cleaned to prevent oil accumulation inside the sound absorbing unit 120 and affect the noise reduction effect.

[0049] like Figure 2 and Figure 3 As shown, the utility model also proposes a sound absorbing module 12, comprising a plurality of different sound absorbing units 120, and the plurality of sound absorbing units 120 are arranged side by side. It should be noted that, here, the difference in the sound absorbing unit 120 refers to the difference in the length and aperture of the sound absorbing unit 120. For example, a sound absorbing module 12 can be composed of a plurality of sound absorbing units 120 of different lengths, or a sound absorbing module 12 can be composed of a plurality of sound absorbing units 120 of the same length but different apertures. The length and aperture of the sound absorbing unit 120 will affect its absorption frequency of sound waves, and different sound absorbing units 120 can absorb sound waves of different frequencies. In this way, by combining a plurality of different sound absorbing units 120, a wider frequency range can be covered to achieve broadband sound absorption and noise reduction. Among them, the first-order resonance frequency difference of any adjacent sound absorbing units 120 is between 30-100 Hz. In this way, the resonance frequencies between the sound absorbing units 120 can be prevented from being too close, thereby reducing the interference of sound waves between the sound absorbing units 120 and optimizing the sound absorption performance.

[0050] The sound absorbing module 12 proposed in the present invention includes the above-mentioned sound absorbing unit 120 and thus has the effect of the above-mentioned sound absorbing unit 120 , which will not be described in detail here.

[0051] like Figure 2 As shown, in one embodiment of the utility model, the sound absorbing unit 120 is L-shaped, straight or 180° folded. The sound absorbing units 120 of these shapes can better adapt to various space conditions and improve space utilization. For example, the L-shaped and 180° folded sound absorbing units 120 can adapt to corners or other limited spaces, while the straight sound absorbing units 120 are suitable for use in more spacious spaces. In addition, the sound absorbing units 120 of these shapes can be flexibly configured according to actual needs to adapt to different noise environments and noise reduction requirements. For example, a sound absorbing unit 120 of a suitable shape can be selected according to the location and characteristics of the noise source, or a combination of sound absorbing units 120 of multiple shapes can be used.

[0052] like Figure 2As shown, in one embodiment of the present invention, at least two straight strip-shaped sound absorbing units 120 of different lengths form a ladder, and at least one L-shaped unit complements the ladder. In this way, by using straight strip-shaped sound absorbing units 120 of different lengths to form a ladder-like structure, combined with L-shaped units, it can flexibly adapt to various spatial layouts and needs. This combination can make full use of corners and other irregular spaces, and can also adapt to specific sound absorption needs through different combinations.

[0053] like Figure 2 As shown, in one embodiment of the present invention, at least one L-shaped sound absorbing unit 120 is arranged side by side with the 180-degree folding sound absorbing unit 120, and at least two 180-degree folding sound absorbing units 120 are arranged side by side. Sound absorbing units 120 of different shapes can further adapt to various spatial structures and conditions, especially in environments with limited space or irregular shapes. This design can make the sound absorbing unit 120 more flexibly arranged in the housing of the range hood 10, fully utilize the available space, and improve the sound absorption efficiency.

[0054] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the sound absorbing module 12 is rectangular, and the rectangular sound absorbing module 12 can effectively utilize the space inside the range hood 10, especially when the space is limited. They can be arranged compactly to maximize the coverage area, thereby improving the sound absorption efficiency.

[0055] like Figure 4 As shown, the utility model also provides a range hood 10, comprising a shell, a volute 11 and the above-mentioned sound absorbing module 12. The volute 11 is arranged in the shell, and the sound absorbing module 12 is arranged in a dead zone of the flow field of the airflow in the shell. The dead zone of the flow field is usually an area where the airflow is weak or stagnant. Placing the sound absorbing module 12 here will not affect the normal airflow and suction efficiency of the range hood 10. In this way, the noise generated by the volute 11 can be effectively absorbed and reduced, thereby reducing the overall noise level of the range hood 10. In addition, since the airflow in the dead zone of the flow field is weak, the sound absorbing module 12 is less affected by oil smoke and heat here, which can extend its service life and reduce the need for maintenance and cleaning.

[0056] The range hood 10 proposed in the present invention includes the above-mentioned sound absorbing module 12, and thus also has the beneficial effects of the above-mentioned sound absorbing module 12, which will not be described in detail here.

[0057] like Figure 4As shown, in some embodiments of the present invention, there are multiple sound absorbing modules 12, and multiple sound absorbing modules 12 are arranged on both sides of the volute 11. Of course, the arrangement of the sound absorbing modules 12 is not limited to this. In other embodiments of the present invention, the sound absorbing modules 12 can also be arranged around the volute 11. In this way, the noise generated by the volute 11 can be absorbed and reduced from multiple directions, thereby more effectively reducing the overall noise level of the range hood 10. In addition, arranging the sound absorbing modules 12 on both sides of the volute 11 or surrounding the volute 11 can help optimize the airflow dynamics inside the range hood 10, reduce the impact of the airflow on the sound absorbing modules 12, thereby improving the service life and noise reduction effect of the sound absorbing modules 12.

[0058] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A sound absorbing unit, characterized in that: include: A 1 / 4 wavelength tube having a sound absorbing cavity formed therein, wherein one end of the 1 / 4 wavelength tube is open and the other end is closed; The open end of the 1 / 4 wavelength tube is provided with a plurality of small holes connecting the sound absorbing cavity and the outside, and the width of each of the small holes is greater than 2 mm.

2. The sound absorbing unit according to claim 1, characterized in that: The width of the small hole is 2mm-4mm.

3. The sound absorbing unit according to claim 1, characterized in that A plurality of said small holes are arranged in an array.

4. The sound absorbing unit according to any one of claims 1 to 3, characterized in that: The opening end is provided with a perforated plate, the small holes are provided on the surface of the perforated plate, and the thickness of the perforated plate is 1mm-3mm.

5. A sound absorbing module, characterized in that: The invention comprises a plurality of different sound absorbing units according to any one of claims 1 to 4, wherein the plurality of sound absorbing units are arranged side by side.

6. The sound absorbing module according to claim 5, characterized in that: The sound absorbing unit is L-shaped, straight-strip-shaped or 180° folded.

7. The sound absorbing module according to claim 5, characterized in that: At least two straight sound absorbing units of different lengths form a step, and at least one L-shaped sound absorbing unit is complementary to the step.

8. The sound absorbing module according to claim 5, characterized in that: At least one L-shaped sound absorbing unit is arranged side by side with the 180-degree folded sound absorbing unit, and at least two 180-degree folded sound absorbing units are arranged side by side.

9. The sound absorbing module according to any one of claims 5 to 8, characterized in that: The sound absorbing module is rectangular.

10. A range hood, characterized in that: include: case; a volute, the volute being disposed in the housing; The sound absorbing module described in any one of claims 5 to 9 is arranged in a dead zone of the flow field formed by the airflow in the shell.

11. The range hood according to claim 10, characterized in that: There are multiple sound absorbing modules, and the multiple sound absorbing modules are arranged on both sides of the volute, or the multiple sound absorbing modules surround the volute. set up.

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