Noise reduction structure, fresh air module and air conditioner

Abstract

The utility model provides a noise reduction structure, a fresh air module and an air conditioner. The noise reduction structure comprises an air inlet shell with an air inlet cavity and a noise reduction assembly arranged in the air inlet cavity. The noise reduction assembly comprises at least one medium-high frequency sound absorber and at least one low-frequency sound absorber. The medium-high frequency sound absorber and the low-frequency sound absorber are arranged in the airflow direction, a first air layer is arranged between the medium-high frequency sound absorber and the bottom wall of the air inlet cavity, and a second air layer is arranged between the medium-high frequency sound absorber and the low-frequency sound absorber. And / or, the medium-high frequency sound absorber and the low-frequency sound absorber are arranged in the direction perpendicular to the airflow direction, a third air layer is arranged between the medium-high frequency sound absorber and the bottom wall of the air inlet cavity, and a fourth air layer is arranged between the low-frequency sound absorber and the bottom wall of the air inlet cavity. According to the noise reduction structure, the noise reduction frequency band can be widened, the multiple noise reduction effect is achieved, and therefore the operation quality of the fresh air module is effectively improved, and the user experience is improved.

Description

Technical Field

[0001] This application belongs to the technical field of air conditioners, and particularly relates to a noise reduction structure, a fresh air module, and an air conditioner. Background Art

[0002] With the improvement of living standards, people have higher and higher requirements for indoor air quality. Fresh air air conditioners are increasingly favored by consumers because they can realize the circulation of indoor and outdoor air. However, the existing fresh air air conditioners still have the following defects: the fresh air noise of the fresh air air conditioner is large, which affects the user experience. Summary of the Utility Model

[0003] The embodiments of this application provide a noise reduction structure, a fresh air module, and an air conditioner to solve the problem of large fresh air noise of the existing fresh air air conditioners.

[0004] In a first aspect, the embodiments of this application provide a noise reduction structure. The noise reduction structure includes an air inlet housing having an air inlet cavity and a noise reduction component disposed in the air inlet cavity. The noise reduction component includes at least one medium-high frequency sound absorber and at least one low-frequency sound absorber; the medium-high frequency sound absorber and the low-frequency sound absorber are arranged along the air flow direction, and a first air layer is provided between the medium-high frequency sound absorber and the bottom wall of the air inlet cavity, and a second air layer is provided between the medium-high frequency sound absorber and the low-frequency sound absorber; and / or, the medium-high frequency sound absorber and the low-frequency sound absorber are arranged along a direction perpendicular to the air flow direction, a third air layer is provided between the medium-high frequency sound absorber and the bottom wall of the air inlet cavity, and a fourth air layer is provided between the low-frequency sound absorber and the bottom wall of the air inlet cavity.

[0005] Optionally, a plurality of support bosses are provided on the side wall of the air inlet cavity, and the support bosses support the medium-high frequency sound absorber below.

[0006] Optionally, a support plate is provided on the side of the low-frequency sound absorber facing the second air layer, and the support plate is used to support the low-frequency sound absorber.

[0007] Optionally, the thicknesses of the first air layer and the third air layer are each independently 10 mm to 15 mm, and the thicknesses of the second air layer and the fourth air layer are each independently 5 mm to 15 mm.

[0008] Optionally, when the medium-high frequency sound absorber and the low-frequency sound absorber are arranged along the air flow direction, the thickness of the medium-high frequency sound absorber is 10 mm to 20 mm; and / or, when the medium-high frequency sound absorber and the low-frequency sound absorber are arranged along the direction perpendicular to the air flow direction, the thickness of the medium-high frequency sound absorber is 20 mm to 25 mm; and / or, when the medium-high frequency sound absorber and the low-frequency sound absorber are arranged along the direction perpendicular to the air flow direction, the top surface of the low-frequency sound absorber is flush with the top surface of the medium-high frequency sound absorber.

[0009] Optionally, the medium-high frequency sound absorber is a porous sound absorption material, and the low-frequency sound absorber is a perforated plate provided with a plurality of through holes.

[0010] Optionally, the aperture of the through holes of the low-frequency sound absorber is 3 mm to 3.5 mm, the perforation rate of the low-frequency sound absorber is P, 25% ≤ P ≤ 50%, and the center distance between two adjacent through holes is 2 mm to 4 mm.

[0011] Optionally, a flow guiding vane is arranged in the air inlet cavity, and the flow guiding vane is used for guiding the incoming air flow to the noise reduction assembly.

[0012] In a second aspect, an embodiment of the present application further provides a fresh air module, and the fresh air module includes the above-mentioned noise reduction structure.

[0013] In a third aspect, an embodiment of the present application further provides an air conditioner, and the air conditioner includes the above-mentioned fresh air module.

[0014] The noise reduction structure, the fresh air module and the air conditioner provided by the embodiments of the present application are provided with a noise reduction assembly in the air inlet cavity. The noise reduction assembly includes at least one medium-high frequency sound absorber and at least one low-frequency sound absorber. The medium-high frequency sound absorber and the low-frequency sound absorber are arranged along the air flow direction. A first air layer is provided between the medium-high frequency sound absorber and the bottom wall of the air inlet cavity, and a second air layer is provided between the medium-high frequency sound absorber and the low-frequency sound absorber; and / or, the medium-high frequency sound absorber and the low-frequency sound absorber are arranged along the direction perpendicular to the air flow direction. A third air layer is provided between the medium-high frequency sound absorber and the bottom wall of the air inlet cavity, and a fourth air layer is provided between the low-frequency sound absorber and the bottom wall of the air inlet cavity. Thereby, the noise reduction frequency band can be broadened to achieve a multiple noise reduction effect, effectively improving the operation quality of the fresh air module and enhancing the user experience. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts. Among them, the same reference numerals represent the same parts in the following description.

[0016] Figure 1 It is a schematic structural diagram of the fresh air module provided by the embodiment of the present application.

[0017] Figure 2 It is the first schematic structural diagram of the noise reduction structure provided by the embodiment of the present application.

[0018] Figure 3 It is Figure 1 the exploded structural diagram of the noise reduction structure shown.

[0019] Figure 4 It is the second schematic structural diagram of the noise reduction structure provided by the embodiment of the present application.

[0020] Figure 5 It is Figure 4 the exploded structural diagram of the noise reduction structure shown.

[0021] Figure 6 It is Figure 4 the cross-sectional schematic diagram of the noise reduction structure shown.

[0022] Figure 7 It is Figure 6 the cross-sectional schematic diagram of the noise reduction structure from another perspective shown.

[0023] Explanation of the reference numerals in the drawings:

[0024] 110, air inlet housing; 111, air inlet cavity; 112, support boss; 113, connector; 121, first air layer; 122, third air layer; 131, second air layer; 132, fourth air layer; 140, medium and high frequency sound absorber; 150, low frequency sound absorber; 160, support plate; 170, guide vane; 210, volute; 220, centrifugal fan; 300, filter device. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0026] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed 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 one or more of the said features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0027] In the present application, the term "exemplary" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "exemplary" in the present application is not necessarily to be construed as more preferred or advantageous than other embodiments. The term "and / or" includes any and all combinations of one or more of the related listed items.

[0028] An embodiment of the present application provides a noise reduction structure, a fresh air module, and an air conditioner. Among them, the fresh air module is applied to the air conditioner to provide fresh air to the indoor environment where the air conditioner is located; the noise reduction structure is applied to the fresh air module to reduce the noise of the fresh air module.

[0029] As Figure 1 shown, the fresh air module provided by the embodiment of the present application includes a noise reduction structure and a fan assembly. Among them, the noise reduction structure includes an air inlet housing 110 having an air inlet cavity 111 and a noise reduction component disposed in the air inlet cavity 111. The noise reduction component includes at least one mid-high frequency sound absorber 140 and at least one low frequency sound absorber 150; the mid-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged along the air flow direction (i.e., the mid-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged in series), and a first air layer 121 is provided between the mid-high frequency sound absorber 140 and the bottom wall of the air inlet cavity 111, and a second air layer 131 is provided between the mid-high frequency sound absorber 140 and the low frequency sound absorber 150; and / or, the mid-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged along a direction perpendicular to the air flow direction (i.e., the mid-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged in parallel), a third air layer 122 is provided between the mid-high frequency sound absorber 140 and the bottom wall of the air inlet cavity 111, and a fourth air layer 132 is provided between the low frequency sound absorber 150 and the bottom wall of the air inlet cavity 111.

[0030] Among them, the air inlet housing 110 is provided with an air inlet and a ventilation opening. Both the air inlet and the ventilation opening are communicated with the air inlet cavity 111, and the ventilation opening is oppositely arranged with respect to the bottom wall of the air inlet cavity 111. When the fan assembly is started, under the suction of the fan assembly, air enters the air inlet cavity 111 through the air inlet. The air in the air inlet cavity 111 passes through the noise reduction assembly and then is discharged from the ventilation opening.

[0031] As Figure 1 shown, the fan assembly includes a volute 210 and a centrifugal fan 220. The volute 210 and the air inlet housing 110 enclose a accommodating space, and the centrifugal fan 220 is arranged in this accommodating space. Among them, a connector 113 for connecting a fresh air pipe is provided at the air inlet of the air inlet housing 110, and an air outlet communicated with the accommodating space is opened on the volute 210. When the fresh air module is started, the centrifugal fan 220 generates suction. Under the suction of the centrifugal fan 220, outdoor fresh air enters the air inlet cavity 111 through the fresh air pipe. The outdoor fresh air in the air inlet cavity 111 sequentially passes through the noise reduction assembly and the ventilation opening, and finally is discharged from the air outlet on the volute 210 into the room.

[0032] The noise reduction structure provided by the embodiment of the present application, through the noise reduction assembly arranged in the air inlet cavity 111, the noise reduction assembly includes at least one medium-high frequency sound absorber 140 and at least one low frequency sound absorber 150. The medium-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged along the air flow direction. A first air layer 121 is provided between the medium-high frequency sound absorber 140 and the bottom wall of the air inlet cavity 111, and a second air layer 131 is provided between the medium-high frequency sound absorber 140 and the low frequency sound absorber 150; and / or, the medium-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged along the direction perpendicular to the air flow direction. A third air layer 122 is provided between the medium-high frequency sound absorber 140 and the bottom wall of the air inlet cavity 111, and a fourth air layer 132 is provided between the low frequency sound absorber 150 and the bottom wall of the air inlet cavity 111. Thereby, the noise reduction frequency band can be broadened, and a multiple noise reduction effect can be achieved, so as to effectively improve the operation quality of the fresh air module and enhance the user experience.

[0033] Specifically, when both the medium-high frequency sound absorber 140 and the low frequency sound absorber 150 are at least one, and the medium-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged along the air flow direction, the first air layer 121, the medium-high frequency sound absorber 140, the second air layer 131 and the low frequency sound absorber 150 form a series structure.

[0034] When both the high frequency sound absorber 140 and the low frequency sound absorber 150 are at least one, and the medium-high frequency sound absorber 140 and the low frequency sound absorber 150 are arranged along the direction perpendicular to the air flow direction, the third air layer 122 and the medium-high frequency sound absorber 140 form a first sound absorption unit, and the fourth air layer 132 and the low frequency sound absorber 150 form a second sound absorption unit. The first sound absorption unit and the second sound absorption unit form a parallel structure.

[0035] When both the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 are multiple, a part of the medium-high frequency sound absorbers 140 and the low-frequency sound absorbers 150 are arranged along the air flow direction, so that the first air layer 121, the medium-high frequency sound absorber 140, the second air layer 131 and the low-frequency sound absorber 150 form a series structure. At the same time, the remaining medium-high frequency sound absorbers 140 and the low-frequency sound absorbers 150 are arranged along the direction perpendicular to the air flow direction, so that the first sound absorption unit composed of the third air layer 122 and the medium-high frequency sound absorber 140 and the second sound absorption unit composed of the fourth air layer 132 and the low-frequency sound absorber 150 form a parallel structure. When the series structure and the parallel structure are arranged along the air flow direction, that is, the series structure and the parallel structure are connected in series.

[0036] In some technologies, a centrifugal fan includes a fan blade and a motor for driving the fan blade to rotate. When the fresh air module is started, the motor drives the fan blade to rotate at a high speed, and outdoor fresh air is sucked into the centrifugal fan from the fresh air pipe to do work. When the fan blade exchanges energy with the gas, turbulence boundary layer, vortices and vortex splitting and shedding are generated when the gas flows through the fan blade, causing large disturbances during the diffuser flow in the volute, and pressure pulsation on the fan blade generates broadband noise with a relatively wide frequency band. Most of the acoustic noise reduction structures of traditional fresh air modules have a significant noise reduction effect on the peak value of a certain specific narrow frequency band, but they cannot achieve good noise reduction effects on continuous low-frequency broadband.

[0037] When the present application adopts the scheme of arranging the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 in series, a composite acoustic noise reduction structure in series of the low-frequency sound absorber 150, the second air layer 131, the medium-high frequency sound absorber 140 and the first air layer 121 can be formed. Among them, the high-frequency sound absorber 140 and the first air layer 121 form a first sound absorption unit capable of absorbing sound waves in the medium-high frequency band, and the low-frequency sound absorber 150 and the second air layer 131 form a second sound absorption unit capable of absorbing sound waves in the low-frequency band. Therefore, the noise reduction structure of the present application can achieve broadening the sound absorption frequency band, has a good absorption effect on low-frequency sound waves and medium-high frequency sound waves, and achieves a multiple noise reduction effect.

[0038] When the present application adopts the scheme of arranging the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 in parallel, a composite acoustic noise reduction structure in parallel of the first sound absorption unit composed of the low-frequency sound absorber 150 and the second air layer 131 and the second sound absorption unit composed of the medium-high frequency sound absorber 140 and the first air layer 121 can be formed. Among them, the first sound absorption unit composed of the high-frequency sound absorber 140 and the first air layer 121 can absorb sound waves in the medium-high frequency band, and at the same time, the second sound absorption unit composed of the low-frequency sound absorber 150 and the second air layer 131 can absorb sound waves in the low-frequency band. Therefore, the noise reduction component of the present application can achieve broadening the sound absorption frequency band, has a good absorption effect on low-frequency sound waves and medium-high frequency sound waves, and achieves a multiple noise reduction effect.

[0039] Similarly, when the present application adopts the solution of series setting of the series structure and the parallel structure, the first sound absorption unit composed of the high-frequency sound absorber 140 and the first air layer 121 can absorb sound waves in the medium and high frequency bands, and at the same time, the second sound absorption unit composed of the low-frequency sound absorber 150 and the second air layer 131 can absorb sound waves in the low frequency band. Therefore, the noise reduction component of the present application can achieve the broadening of the sound absorption frequency band, has a good absorption effect on low-frequency sound waves and medium and high-frequency sound waves, and achieves a multiple noise reduction effect.

[0040] Optionally, a plurality of support bosses 112 are provided on the side wall of the air inlet cavity 111, and the support bosses 112 support the lower part of the high-frequency sound absorber 140. The high-frequency sound absorber 140 is supported by a plurality of support bosses 112 on the side wall of the air inlet cavity 111, so that a first gap is formed between the high-frequency sound absorber 140 and the bottom wall of the air inlet cavity 111 to form a first air layer 121, or a third gap is formed between the high-frequency sound absorber 140 and the bottom wall of the air inlet cavity 111 to form a third air layer 122.

[0041] Specifically, when the high-frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in series, the first gap between the high-frequency sound absorber 140 and the bottom wall of the air inlet cavity 111 forms a first air layer 121; when the high-frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in parallel, the third gap between the high-frequency sound absorber 140 and the bottom wall of the air inlet cavity 111 forms a third air layer 122.

[0042] Optionally, a support plate 160 is provided on the side of the low-frequency sound absorber 150 facing the second air layer 131, and the support plate 160 is used to support the low-frequency sound absorber 150. The low-frequency sound absorber 150 is supported by the support plate 160, so that a second gap is formed between the low-frequency sound absorber 150 and the high-frequency sound absorber 140 to form a second air layer 131, or a fourth gap is formed between the low-frequency sound absorber 150 and the bottom wall of the air inlet cavity 111 to form a fourth air layer 132.

[0043] Specifically, when the high-frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in series, the second gap between the low-frequency sound absorber 150 and the bottom wall of the air inlet cavity 111 forms a second air layer 131; when the high-frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in parallel, the fourth gap between the low-frequency sound absorber 150 and the high-frequency sound absorber 140 forms a fourth air layer.

[0044] Optionally, the thickness of the first air layer 121 is 10 mm to 15 mm, and the thickness of the second air layer 131 is 5 mm to 15 mm. Through experimental verification, when the thickness of the first air layer 121 is controlled within the range of 10 mm to 15 mm and the thickness of the second air layer 131 is controlled within the range of 5 mm to 15 mm, the absorption effect on low-frequency sound waves and medium-high-frequency sound waves is better. Exemplarily, the thickness of the first air layer 121 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, etc., and the thickness of the second air layer 131 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, etc., and can be specifically set according to actual requirements.

[0045] Optionally, the thickness of the third air layer 122 is 10 mm to 15 mm, and the thickness of the fourth air layer 132 is 5 mm to 15 mm. Through experimental verification, when the thickness of the third air layer 122 is controlled within the range of 10 mm to 15 mm and the thickness of the fourth air layer 132 is controlled within the range of 5 mm to 15 mm, the absorption effect on low-frequency sound waves and medium-high-frequency sound waves is better. Exemplarily, the thickness of the third air layer 122 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, etc., and the thickness of the fourth air layer 132 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, etc., and can be specifically set according to actual requirements.

[0046] Optionally, the medium-high-frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in the air flow direction, that is, when the medium-high-frequency sound absorber 140 and the low-frequency sound absorber 150 are connected in series, the thickness of the medium-high-frequency sound absorber 140 is 10 mm to 20 mm. Through experimental verification, when the thickness of the medium-high-frequency sound absorber 140 is controlled within the range of 10 mm to 20 mm, the absorption effect on medium-high-frequency sound waves is better. Exemplarily, when the medium-high-frequency sound absorber 140 and the low-frequency sound absorber 150 are connected in series, the thickness of the medium-high-frequency sound absorber 140 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm, etc., and can be specifically set according to actual requirements.

[0047] Optionally, when the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in a direction perpendicular to the air flow direction, that is, when the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in parallel, the thickness of the medium-high frequency sound absorber 140 is 20 mm to 25 mm. Through experimental verification, when the thickness of the medium-high frequency sound absorber 140 is controlled within the range of 20 mm to 25 mm, the absorption effect on medium-high frequency sound waves is better. Exemplarily, when the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in parallel, the thickness of the medium-high frequency sound absorber 140 can be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm or 25 mm, etc., and can be specifically set according to actual requirements.

[0048] In some embodiments of the present application, when the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in a direction perpendicular to the air flow direction, that is, when the medium-high frequency sound absorber 140 and the low-frequency sound absorber 150 are arranged in parallel, the top surface of the low-frequency sound absorber 150 is flush with the top surface of the medium-high frequency sound absorber 140, so as to facilitate the installation of a filter screen at the ventilation opening of the air inlet cavity 111.

[0049] In some embodiments of the present application, the medium-high frequency sound absorber 140 is a porous foamed sound-absorbing material. For example, the medium-high frequency sound absorber 140 can be a porous foamed sound-absorbing material or a porous fibrous sound-absorbing material (such as sound-absorbing cotton); while the low-frequency sound absorber 150 is a perforated plate provided with a plurality of through holes.

[0050] Optionally, the through hole diameter of the perforated plate is 3 mm to 3.5 mm, the perforation rate of the perforated plate is P, and 25% ≤ P ≤ 50%. The center distance between two adjacent through holes (i.e., the hole pitch) is 2 mm to 4 mm. Among them, the "perforation rate" refers to the ratio of the perforated area to the total area of the perforated plate.

[0051] Exemplarily, the through hole diameter of the through holes on the perforated plate can be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm or 3.5 mm, etc., the perforation rate P of the perforated plate can be 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49% or 50%, etc., and the center distance between two adjacent through holes can be 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm or 4 mm, etc., and can be specifically set according to actual requirements.

[0052] Specifically, the sound absorption frequency band of the perforated plate, the structural parameters of the perforated plate, and the thickness of the first air layer 121 or the thickness of the third air layer 122 satisfy the following formula:

[0053]

[0054] In the formula, L is the thickness of the first air layer 121 or the third air layer 122, t is the thickness of the perforated plate, d is the aperture of the through hole, c is the speed of sound, and P is the perforation rate of the perforated plate (perforation rate = perforation area / total area * 100%).

[0055] By adjusting the structure of the noise reduction component (the mid-high frequency absorber 140 and the low frequency absorber 150 are arranged in series, or the mid-high frequency absorber 140 and the low frequency absorber 150 are arranged in parallel, or the series structure and the parallel structure are arranged in series), the thickness of the low frequency absorber 150, the perforation rate of the low frequency absorber 150, the aperture of the through holes on the low frequency absorber 150, and the thickness of the first air layer 121, the peak sound absorption coefficient and the corresponding sound absorption frequency band in the mid-low frequency band can be further regulated, so as to achieve sound absorption in different frequency bands and the effect of broadening the frequency band, and effectively absorb and control the fresh air radiation noise further.

[0056] Optionally, a flow guiding piece 170 is arranged in the air inlet cavity 111. The flow guiding piece 170 and the noise reduction component are respectively located on two opposite sides of the air inlet of the air inlet cavity 111. The flow guiding piece 170 has a flow guiding surface, and the flow guiding surface is perpendicular to the bottom wall of the air inlet cavity 111 and faces the noise reduction component, so as to guide the incoming air flow to the noise reduction component through the flow guiding surface, so that the noise reduction component can perform noise reduction more effectively.

[0057] Optionally, as Figure 1 shown, a filtering device 300 can also be installed at the connection between the air inlet housing and the volute, so as to filter the outdoor fresh air and then transport it indoors to meet the fresh air purification needs of users.

[0058] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0059] The above has introduced the noise reduction structure and the fresh air module provided by the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A noise reduction structure, characterized in that, It includes an air inlet housing (110) having an air inlet cavity (111) and a noise reduction component disposed within the air inlet cavity (111), the noise reduction component including at least one medium-high frequency sound absorber (140) and at least one low-frequency sound absorber (150); The medium-high frequency sound absorber (140) and the low-frequency sound absorber (150) are arranged along the air flow direction, and a first air layer (121) is provided between the medium-high frequency sound absorber (140) and the bottom wall of the air inlet cavity (111), and a second air layer (131) is provided between the medium-high frequency sound absorber (140) and the low-frequency sound absorber (150); And / or, the medium-high frequency sound absorber (140) and the low-frequency sound absorber (150) are arranged along a direction perpendicular to the air flow direction, a third air layer (122) is provided between the medium-high frequency sound absorber (140) and the bottom wall of the air inlet cavity (111), and a fourth air layer (132) is provided between the low-frequency sound absorber (150) and the bottom wall of the air inlet cavity (111).

2. The noise reduction structure according to claim 1, wherein, A plurality of support bosses (112) are provided on the side wall of the air inlet cavity (111), and the support bosses (112) support the lower part of the medium-high frequency sound absorber (140).

3. The noise reduction structure according to claim 1, characterized in that, A support plate (160) is provided on one side of the low-frequency sound absorber (150) facing the second air layer (131), and the support plate (160) is used to support the low-frequency sound absorber (150).

4. The noise reduction structure according to claim 1, wherein The thicknesses of the first air layer (121) and the third air layer (122) are each independently 10 mm to 15 mm, and the thicknesses of the second air layer (131) and the fourth air layer (132) are each independently 5 mm to 15 mm.

5. The noise reduction structure according to claim 1, wherein When the medium-high frequency sound absorber (140) and the low-frequency sound absorber (150) are arranged along the air flow direction, the thickness of the medium-high frequency sound absorber (140) is 10 mm to 20 mm; and / or, when the medium-high frequency sound absorber (140) and the low-frequency sound absorber (150) are arranged along a direction perpendicular to the air flow direction, the thickness of the medium-high frequency sound absorber (140) is 20 mm to 25 mm; And / or, when the medium-high frequency sound absorber (140) and the low-frequency sound absorber (150) are arranged along a direction perpendicular to the air flow direction, the top surface of the low-frequency sound absorber (150) is flush with the top surface of the medium-high frequency sound absorber (140).

6. The noise reduction structure according to any one of claims 1 to 5, characterized in that, The medium-high frequency sound absorber (140) is a porous sound-absorbing material, and the low-frequency sound absorber (150) is a perforated plate provided with a plurality of through holes.

7. The noise reduction structure according to claim 6, characterized in that, The through hole diameter of the perforated plate is 3 mm to 3.5 mm, the perforation rate of the perforated plate is P, 25% ≤ P ≤ 50%, and the center distance between two adjacent through holes is 2 mm to 4 mm.

8. The noise reduction structure according to any one of claims 1 to 5, characterized in that, A flow guide vane (170) is provided within the air inlet cavity (111), and the flow guide vane (170) is used to direct the incoming air flow to the noise reduction component.

9. A fresh air module, characterized in that, The fresh air module includes the noise reduction structure according to any one of claims 1 to 8.

10. An air conditioner, characterized in that, The air conditioner includes the fresh air module according to claim 9.

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