Silencing device and electrical equipment

Abstract

The application discloses a kind of muffler and electrical equipment, belong to muffler technical field.Muffler is applied to electrical equipment, comprising: multilayer muffling unit, muffling unit has multiple along the first direction spaced apart distribution sound-absorbing cavity, sound-absorbing cavity penetrates muffling unit, and the sound-absorbing cavity of each layer muffling unit is communicated into sound-absorbing passage;Multilayer muffling unit is stacked along the second direction, each layer muffling unit is at least one kind in multiple kinds of muffling unit, and the sound-absorbing frequency corresponding to any two kinds of muffling unit is different, and the first direction and the second direction intersect.In the technical scheme of the application, by changing the combination form of different kinds of muffling unit, different noise reduction demand can be met, and noise reduction demand under specific frequency can also be met.

Description

Technical Field

[0001] This application belongs to the field of noise reduction device technology, and particularly relates to a noise reduction device and electrical equipment. Background Technology

[0002] As energy storage devices and power plants are installed closer to residential areas, noise complaints have become a major concern. Research has revealed that the primary source of noise is the aerodynamic noise generated by the cooling fans of the energy storage system. Common solutions for fan noise include installing noise reduction devices externally to the energy storage equipment to cut off the noise propagation path. However, this approach cannot meet the noise reduction requirements for specific frequencies and only achieves a fixed amount of noise reduction. It also makes subsequent maintenance and replacement difficult, limiting its applicability and leaving room for improvement. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a silencing device and electrical equipment that can meet different noise reduction requirements.

[0004] In a first aspect, this application provides a noise reduction device for use in electrical equipment, comprising: A multi-layer silencing unit, wherein the silencing unit has a plurality of silencing cavities spaced apart along a first direction, the silencing cavities penetrating the silencing unit, and the silencing cavities of each layer of the silencing unit are connected to form a silencing channel; The multiple layers of silencing units are stacked along the second direction, and each layer of silencing units is at least one of multiple types of silencing units. Any two types of silencing units correspond to different silencing frequencies, and the first direction intersects with the second direction.

[0005] In the above technical solutions, by changing the combination of different types of noise reduction units, different noise reduction requirements can be met, as well as noise reduction requirements at specific frequencies.

[0006] According to one embodiment of this application, the silencing device includes multiple layers of silencing units stacked along the second direction, each layer of silencing units being at least one of a first type of silencing unit, a second type of silencing unit, and a third type of silencing unit, and the silencing frequencies corresponding to any two types of silencing units are different.

[0007] According to one embodiment of this application, the flow cross-sectional area of ​​the silencing cavity corresponding to one type of silencing unit is larger than the flow cross-sectional area of ​​the silencing cavity corresponding to another type of silencing unit; or, The projection of the silencing cavity corresponding to one type of silencing unit along the second direction is offset from the projection of the silencing cavity corresponding to another type of silencing unit along the second direction; or, The normals of the silencing cavities corresponding to any two types of silencing units form an angle.

[0008] According to one embodiment of this application, the silencing device includes a first to a third layer of silencing units, wherein the flow cross-sectional area of ​​the silencing cavity corresponding to the first layer of silencing units is smaller than the flow cross-sectional area of ​​the silencing cavity corresponding to the second layer of silencing units, and the flow cross-sectional area of ​​the silencing cavity corresponding to the third layer of silencing units is smaller than the flow cross-sectional area of ​​the silencing cavity corresponding to the second layer of silencing units.

[0009] According to one embodiment of this application, the opening direction of the silencing cavity corresponding to the outermost silencing unit is different from the opening direction of the silencing cavity corresponding to the other silencing units.

[0010] According to one embodiment of this application, the silencing unit includes a cover and a plurality of silencing plates. The plurality of silencing plates are installed on the cover and are spaced apart along the first direction or a third direction, and the silencing cavity is formed between adjacent silencing plates.

[0011] According to one embodiment of this application, the silencing device further includes: The sealing element has a sealing groove and a drainage groove at one end of the cover along the second direction. The sealing element is installed in the sealing groove, and the drainage groove is connected to the sealing groove.

[0012] In the above technical solution, a sealing element can be provided between adjacent silencing units and between the silencing unit and the electrical equipment to improve the sealing performance of the silencing device.

[0013] According to one embodiment of this application, the sound-absorbing sheet includes a substrate and a sound-absorbing member. The substrate is provided with a sound-absorbing hole, and the sound-absorbing member is opposite to the sound-absorbing hole or fills the sound-absorbing hole.

[0014] According to one embodiment of this application, at least a portion of the sound-absorbing plate is wavy; or, The thickness of the middle part of the sound-absorbing sheet is greater than the thickness of the two ends.

[0015] Secondly, this application provides an electrical device, comprising: The housing forms a cavity that houses electrical components and a fan, and the housing has an air outlet. The silencing device as described in any one of the above description is installed in the housing, the silencing cavity is connected to the air outlet and the external environment, and the silencing device is used to reduce noise for the fan.

[0016] In the above technical solution, by installing the silencing device of this application outside the air outlet of the electrical equipment, different noise reduction requirements can be met, as well as noise reduction requirements at specific frequencies.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application; Figure 2 This is one of the structural schematic diagrams of the silencing device provided in the embodiments of this application; Figure 3 This is a second schematic diagram of the structure of the silencing device provided in the embodiments of this application; Figure 4 yes Figure 3 Sectional view at point AA; Figure 5 This is the third schematic diagram of the structure of the silencing device provided in the embodiments of this application; Figure 6 This is one of the exploded schematic diagrams of the silencing unit of the silencing device provided in the embodiments of this application; Figure 7 yes Figure 6 A magnified view of a section at point B in the middle; Figure 8 This is the second exploded schematic diagram of the silencing unit of the silencing device provided in the embodiments of this application; Figure 9 This is the fourth schematic diagram of the structure of the silencing device provided in the embodiments of this application; Figure 10 This is the fifth schematic diagram of the silencing device provided in the embodiments of this application.

[0019] Figure label: Electrical equipment 1; Silencing device 10; Silencing unit 110, silencing cavity 111; Cover 120, boss 121, seal 122, sealing groove 123, drainage groove 124; Silencing plate 130, card slot 131; The first layer of noise reduction unit is 140, the second layer of noise reduction unit is 150, and the third layer of noise reduction unit is 160. The first type of noise reduction unit is 170, the second type of noise reduction unit is 180, and the third type of noise reduction unit is 190; Box 20; First direction X, second direction Y, third direction Z. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a silencing device and electrical equipment that can meet different noise reduction requirements.

[0022] The following is for reference. Figures 1-10 A silencing device 10 according to an embodiment of this application is described.

[0023] like Figure 1 and Figure 2 As shown, the silencing device 10 is applied to electrical equipment 1 and includes: The multi-layer silencing unit 110 has multiple silencing cavities 111 spaced apart along the first direction X. The silencing cavities 111 penetrate the silencing unit 110, and the silencing cavities 111 of each layer of the silencing unit 110 are connected to form a silencing channel. The multi-layer silencing units 110 are stacked along the second direction Y. Each layer of silencing unit 110 is at least one of the multiple types of silencing units. The silencing frequencies corresponding to any two types of silencing units are different. The first direction X intersects with the second direction Y.

[0024] At least one layer of silencing unit 110 is installed at the air outlet of electrical equipment 1. The silencing unit 110 forms multiple silencing cavities 111. The silencing cavities 111 are used to connect the air outlet of electrical equipment 1 with the external environment. The multiple silencing cavities 111 are distributed at intervals along the first direction X. The normal direction of the wall where the air outlet of electrical equipment 1 is located is the second direction Y. The first direction X and the second direction Y intersect.

[0025] In this embodiment, the silencing device 10 is installed at the air outlet of the electrical equipment 1, and the silencing device 10 includes at least one layer of silencing unit 110. The silencing unit 110 forms a plurality of silencing cavities 111. The distribution direction of the plurality of silencing cavities 111 in the silencing unit 110 is defined as the first direction X. The normal direction of the wall where the air outlet of the electrical equipment 1 is located is defined as the second direction Y. The normal direction of the wall where the silencing cavity 111 is parallel to the first direction X is defined as the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other.

[0026] The silencing device 10 may include a single-layer silencing unit 110 or multiple-layer silencing units 110. The silencing chambers 111 of the silencing units 110 are all connected to the air outlet of the electrical equipment 1 along the second direction Y. For example, the silencing unit 110 may have at least one open end along the second direction Y. The open end of the silencing unit 110 and the air outlet of the electrical equipment 1 together realize the connection between the silencing chamber 111 and the internal environment of the electrical equipment 1.

[0027] In addition, each layer of silencing unit 110 can be at least one of the first type of silencing unit 170, the second type of silencing unit 180 and the third type of silencing unit 190, and the silencing frequencies corresponding to any two types of silencing units 110 are different.

[0028] When the silencing device 10 includes a multi-layer silencing unit 110, at least one of the multi-layer silencing units 110 can form an expansion cavity. When a sound wave enters the expansion cavity, the sudden increase in the flow cross-sectional area causes some of the sound wave to be reflected. The reflected sound wave interferes with the original sound wave, thereby reducing noise. At the same time, the ratio of the flow cross-sectional area to the inlet cross-sectional area of ​​the expansion cavity is the expansion ratio. By changing the size of the expansion ratio, noise reduction at a specific frequency can be further achieved.

[0029] As energy storage devices and power plants are installed closer to residential areas, noise complaints have become a major concern. Research has revealed that the primary source of noise is the aerodynamic noise generated by the cooling fans of the energy storage system. Common solutions for fan noise include installing noise reduction devices externally to the energy storage equipment to cut off the noise propagation path. However, this approach cannot meet the noise reduction requirements for specific frequencies and only achieves a fixed amount of noise reduction. It also makes subsequent maintenance and replacement difficult, limiting its applicability and leaving room for improvement.

[0030] The silencing device 10 of this application includes at least one layer of silencing unit 110, and each layer of silencing unit 110 is at least one of the first type of silencing unit 170, the second type of silencing unit 180 and the third type of silencing unit 190. This application can adjust the noise reduction of the silencing device 10 by changing the number of layers of silencing unit 110 in the silencing device 10, thereby meeting different noise reduction requirements. It can also form expansion cavities with different expansion ratios by changing the combination of different types of silencing unit 110. Different expansion ratios correspond to different noise reduction frequencies, thereby meeting the noise reduction requirements at specific frequencies.

[0031] According to the silencing device 10 provided in the embodiments of this application, by changing the combination of different types of silencing units 110, different noise reduction requirements can be met, as well as noise reduction requirements at specific frequencies.

[0032] In some embodiments, such as Figures 2-5As shown, the flow cross-sectional area of ​​the silencing cavity 111 corresponding to one type of silencing unit is larger than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the other type of silencing unit; or, The projection of the silencing cavity 111 corresponding to one type of silencing unit along the second direction Y is offset from the projection of the silencing cavity 111 corresponding to another type of silencing unit along the second direction Y; or, The normals of the silencing cavities 111 corresponding to any two types of silencing units form an angle.

[0033] In other words, the silencing device 10 includes multiple layers of silencing units 110 stacked along the second direction Y. The flow cross-sectional area of ​​the silencing cavity 111 corresponding to any two types of silencing units 110 is different, or the silencing cavity 111 is divided in a different way along the first direction X, or the opening direction of the silencing cavity 111 is different.

[0034] The silencing unit 110 is equipped with silencing plates 130 spaced apart along the first direction X. The silencing plates 130 divide the sound-absorbing cavities 111 with the same flow cross-sectional area. The flow cross-sectional area of ​​the sound-absorbing cavity 111 is related to the number of silencing plates 130. For example, among the multiple silencing units 110, the silencing unit 110 with the smaller flow cross-sectional area of ​​the corresponding sound-absorbing cavity 111 has a larger number of silencing plates 130.

[0035] In this embodiment, the silencing cavities 111 corresponding to any two types of silencing units 110 among the first type of silencing unit 170, the second type of silencing unit 180, and the third type of silencing unit 190 are different. Specifically, the flow cross-sectional area of ​​the silencing cavities 111 corresponding to the first type of silencing unit 170 and the second type of silencing unit 180 is different, the opening direction of the silencing cavities 111 corresponding to the first type of silencing unit 170 and the third type of silencing unit 190 is different, and the flow cross-sectional area and opening direction of the silencing cavities 111 corresponding to the second type of silencing unit 180 and the third type of silencing unit 190 are both different.

[0036] In other words, the opening directions of the silencing cavities 111 corresponding to the first type of silencing unit 170 and the second type of silencing unit 180 are the same, and are different from the opening directions of the silencing cavities 111 corresponding to the third type of silencing unit 190. For example, the first type of silencing unit 170 and the second type of silencing unit 180 are open at both ends along the second direction Y, the third type of silencing unit 190 is open at one end along the second direction Y, and the third type of silencing unit 190 is open at one end along the third direction Z.

[0037] It should be noted that the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first type of silencing unit 170, the second type of silencing unit 180, and the third type of silencing unit 190 is not a fixed value, but is within a certain range, and all values ​​within this range can be obtained. Moreover, the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first type of silencing unit 170 and the third type of silencing unit 190 is within the same range. At the same time, the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first type of silencing unit 170 and the third type of silencing unit 190 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second type of silencing unit 180.

[0038] Furthermore, the layer of silencing unit 110 closest to the air outlet of electrical equipment 1 is defined as the first layer of silencing unit 140, the layer of silencing unit 110 furthest from the air outlet of electrical equipment 1 is defined as the outermost layer of silencing unit 110, and the other layers of silencing units 110 are stacked sequentially in the direction away from the air outlet of electrical equipment 1.

[0039] In the case where the silencing device 10 includes multiple layers of silencing units 110 stacked along the second direction Y, the outermost silencing unit 110 is one of the first type of silencing unit 170, the second type of silencing unit 180 and the third type of silencing unit 190, and the other layers of silencing units 110 are one of the first type of silencing unit 170 and the second type of silencing unit 180.

[0040] In some embodiments, such as Figure 5 As shown, the opening direction of the silencing cavity 111 corresponding to the outermost silencing unit 110 is different from the opening direction of the silencing cavity 111 corresponding to the other silencing units 110.

[0041] In this embodiment, when the silencing device 10 includes multiple layers of silencing units 110 stacked along the second direction Y, the outermost silencing unit 110 is a third type of silencing unit 190, and the other layers of silencing units 110 are one of the first type of silencing unit 170 and the second type of silencing unit 180.

[0042] Among them, the first type of silencing unit 170 and the second type of silencing unit 180 are open at both ends along the second direction Y, the third type of silencing unit 190 is open at one end along the second direction Y, and the third type of silencing unit 190 is open at one end along the third direction Z. The third type of silencing unit 190 can offset the air outlet of the electrical equipment 1 from the air outlet of the outermost silencing unit 110, thereby changing the direction of noise propagation and reducing the noise superposition effect.

[0043] In some embodiments, taking the silencing device 10 as an example, which includes a single-layer silencing unit 110, the silencing device 10 has various structural forms, including but not limited to: the silencing device 10 includes one of the following: a first type of silencing unit 170, a second type of silencing unit 180, and a third type of silencing unit 190.

[0044] In this embodiment, the first type of noise reduction unit 170, the second type of noise reduction unit 180 and the third type of noise reduction unit 190 can all include a cover 120 and a plurality of noise reduction plates 130. The plurality of noise reduction plates 130 are installed on the cover 120 and are spaced apart along the first direction X or the third direction Z. A noise reduction cavity 111 is formed between adjacent noise reduction plates 130.

[0045] Among them, the covers 120 of the first type of noise reduction unit 170 and the second type of noise reduction unit 180 are open at both ends along the second direction Y, and the cover 120 of the third type of noise reduction unit 190 is open at one end along the second direction Y and at one end along the first direction X or the third direction Z.

[0046] When the first type of silencing unit 170 or the second type of silencing unit 180 is installed at the air outlet of the electrical equipment 1, the silencing cavity 111 corresponding to the first type of silencing unit 170 or the second type of silencing unit 180 is connected to the air outlet of the electrical equipment 1 and the outside through the open end, respectively. The air flow direction is the same as the second direction Y, and the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first type of silencing unit 170 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second type of silencing unit 180. The noise reduction effects of the first type of silencing unit 170 and the second type of silencing unit 180 are different.

[0047] When the third type of silencing unit 190 is installed at the air outlet of the electrical equipment 1, the silencing cavity 111 corresponding to the second type of silencing unit 180 is connected to the air outlet of the electrical equipment 1 and the outside through its open end. The airflow direction changes within the silencing cavity 111, for example, in... Figure 5 In the middle, the direction of air flow is the same as the second direction Y in the first part, and the same as the third direction Z in the second part.

[0048] In some embodiments, the silencing device 10 includes a multi-layered silencing unit 110 stacked along the second direction Y.

[0049] Taking the silencing device 10, which includes two layers of silencing units 110 stacked along the second direction Y, as an example, the silencing device 10 has various structural forms, including but not limited to: Example 1: The two layers of silencing units 110 are of the same type.

[0050] In this embodiment, the silencing device 10 includes a first layer of silencing units 140 and a second layer of silencing units 150 stacked sequentially along the second direction Y. The two layers of silencing units 110 stacked along the second direction Y are of the same type. For example, the silencing device 10 includes two layers of first-type silencing units 170 stacked along the second direction Y, or the silencing device 10 includes two layers of second-type silencing units 180 stacked along the second direction Y.

[0051] It should be noted that the first layer of the silencing unit 140 of the silencing device 10 does not include the third type of silencing unit 190, so there is no combination of two layers of third type of silencing units 190 stacked along the second direction Y.

[0052] Example 2: The two layers of silencing units 110 are of different types.

[0053] In this embodiment, the silencing device 10 includes a first layer of silencing units 140 and a second layer of silencing units 150 stacked sequentially along the second direction Y. The two layers of silencing units 110 stacked along the second direction Y are of different types. For example, when the first layer of silencing unit 140 of the silencing device 10 is a first type of silencing unit 170, the second layer of silencing unit 150 of the silencing device 10 can be a second type of silencing unit 180 or a third type of silencing unit 190. Or, for example, when the first layer of silencing unit 140 of the silencing device 10 is a second type of silencing unit 180, the second layer of silencing unit 150 of the silencing device 10 can be a first type of silencing unit 170 or a third type of silencing unit 190.

[0054] It should be noted that the first layer of the silencing unit 140 of the silencing device 10 does not include the third type of silencing unit 190.

[0055] Taking the silencing device 10 as an example, which includes three layers of silencing units 110 stacked along the second direction Y, as follows: Figures 2-5 As shown, the silencing device 10 has various structural forms, including but not limited to: Example 1: The three-layer silencing unit 110 are all of the same type.

[0056] In this embodiment, the silencing device 10 includes a first layer of silencing units 140, a second layer of silencing units 150, and a third layer of silencing units 160 stacked sequentially along the second direction Y. For example, the first layer of silencing units 140, the second layer of silencing units 150, and the third layer of silencing units 160 are all first-type silencing units 170, or the first layer of silencing units 140, the second layer of silencing units 150, and the third layer of silencing units 160 are all second-type silencing units 180.

[0057] It should be noted that neither the first layer of silencing unit 140 nor the second layer of silencing unit 150 of the silencing device 10 includes the third type of silencing unit 190. Therefore, there is no combination of three layers of third type of silencing units 190 stacked along the second direction Y.

[0058] Example 2: Any two layers in the three-layer silencing unit 110 are of the same type.

[0059] like Figure 2As shown, in this embodiment, the silencing device 10 includes a first layer of silencing units 140, a second layer of silencing units 150, and a third layer of silencing units 160 stacked sequentially along the second direction Y. For example, the first layer of silencing units 140 and the second layer of silencing units 150 are first-type silencing units 170, and the third layer of silencing units 160 is a second-type silencing unit 180 or a third-type silencing unit 190. Alternatively, the first layer of silencing units 140 and the second layer of silencing units 150 are second-type silencing units 180 or 190. For example, the first-layer noise reduction unit 180 and the third-layer noise reduction unit 160 are either the first-layer noise reduction unit 170 or the third-layer noise reduction unit 190. Alternatively, the first-layer noise reduction unit 140 and the third-layer noise reduction unit 160 are either the first-layer noise reduction unit 170 or the second-layer noise reduction unit 150 are either the second-layer noise reduction unit 180 or the first-layer noise reduction unit 170.

[0060] It should be noted that neither the first layer silencing unit 140 nor the second layer silencing unit 150 of the silencing device 10 includes the third type of silencing unit 190.

[0061] Example 3: The three-layer silencing units 110 are all of different types.

[0062] like Figure 5 As shown, in this embodiment, the silencing device 10 includes a first layer of silencing units 140, a second layer of silencing units 150, and a third layer of silencing units 160 stacked sequentially along the second direction Y. For example, the first layer of silencing units 140 is a first type of silencing unit 170, the second layer of silencing units 150 is a second type of silencing unit 180, and the third layer of silencing units 160 is a third type of silencing unit 190, or the first layer of silencing units 140 is a second type of silencing unit 180, the second layer of silencing units 150 is a first type of silencing unit 170, and the third layer of silencing units 160 is a third type of silencing unit 190.

[0063] It should be noted that neither the first layer silencing unit 140 nor the second layer silencing unit 150 of the silencing device 10 includes the third type of silencing unit 190.

[0064] In addition, other combinations of layers can refer to the layout of the two-layer silencing unit 110 and the three-layer silencing unit 110 mentioned above.

[0065] In some embodiments, such as Figure 4 As shown, the silencing device 10 can form an expansion cavity, and the inlet cross-sectional area of ​​the expansion cavity is smaller than the flow cross-sectional area of ​​the expansion cavity.

[0066] In this embodiment, the expansion cavity can form a structure in which the flow cross-sectional area suddenly increases in the direction of air flow. When the sound wave enters the expansion cavity, the suddenly increased flow cross-sectional area causes part of the sound wave to be reflected. The reflected sound wave interferes with the original sound wave, thereby reducing noise. At the same time, the ratio of the flow cross-sectional area to the inlet cross-sectional area of ​​the expansion cavity is the expansion ratio. By changing the size of the expansion ratio, noise reduction at a specific frequency can be further achieved.

[0067] Furthermore, the formation of the expansion cavity requires at least three layers of silencing units 110, and the expansion cavity can be formed in various ways, including but not limited to: Example 1: The silencing device 10 forms an expansion cavity.

[0068] In this embodiment, the silencing device 10 may include a first to a third layer of silencing units 160, wherein the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer of silencing unit 140 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer of silencing unit 150, and the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the third layer of silencing unit 160 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer of silencing unit 150.

[0069] The first to third layers of silencing units 160 form an expansion cavity. For example, the second layer of silencing unit 150 can be a second type of silencing unit 180, the first layer of silencing unit 140 can be a first type of silencing unit 170, and the third layer of silencing unit 160 can be a first type of silencing unit 170 or a third type of silencing unit 190.

[0070] The expansion ratio is the ratio of the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer silencing unit 140 to the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer silencing unit 150. By changing the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer silencing unit 140 within a certain range, the noise reduction requirements at a specific frequency can be met.

[0071] In addition, the silencing device 10 may also include more than three layers of silencing units 110, such as stacking other types of silencing units 110 outside the adjacent three layers of silencing units 110 that form the expansion cavity.

[0072] Example 2: The silencing device 10 forms multiple expansion cavities.

[0073] In this embodiment, taking a combination of two expansion cavities formed by the silencing device 10 as an example, the silencing device 10 may include a first to a fifth layer of silencing units 110, wherein the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer of silencing unit 140 and the third layer of silencing unit 160 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer of silencing unit 150, and the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the third layer of silencing unit 160 and the fifth layer of silencing unit 110 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the fourth layer of silencing unit 110.

[0074] The first to third layers of silencing units 160 form an expansion cavity, and the third to fifth layers of silencing units 110 also form an expansion cavity. For example, the second layer of silencing unit 150 and the fourth layer of silencing unit 110 can be second-type silencing units 180, the first layer of silencing unit 140 and the third layer of silencing unit 160 can be first-type silencing units 170, and the fifth layer of silencing unit 110 can be either first-type silencing unit 170 or third-type silencing unit 190.

[0075] The expansion ratio of the expansion cavity formed by the first to third layers of silencing units 160 is the ratio of the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer of silencing unit 140 to the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer of silencing unit 150. The expansion ratio of the expansion cavity formed by the third to fifth layers of silencing units 110 is the ratio of the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the third layer of silencing unit 160 to the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the fourth layer of silencing unit 110. By changing the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer of silencing unit 140 within a certain range, the noise reduction requirements at a specific frequency can be met.

[0076] In addition, the silencing device 10 may also include more than five layers of silencing units 110, such as stacking other types of silencing units 110 outside the adjacent five layers of silencing units 110 that form the expansion cavity.

[0077] In some embodiments, such as Figures 2-4 As shown, the silencing device 10 may include a first to a third layer of silencing units 160, wherein the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer of silencing unit 140 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer of silencing unit 150, and the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the third layer of silencing unit 160 is smaller than the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer of silencing unit 150.

[0078] In this embodiment, the first to third silencing units 160 form an expansion cavity.

[0079] The upper cutoff frequency for effective noise reduction by the expansion cavity satisfies:

[0080] Where c is a coefficient and D is the equivalent diameter of the expansion cavity cross section, that is, the equivalent diameter of the silencing cavity 111 corresponding to the second layer silencing unit 150.

[0081] The lower cutoff frequency for effective noise reduction by the expansion cavity satisfies:

[0082] Where c is a coefficient, S1 is the inlet cross-sectional area of ​​the expansion cavity, that is, the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer silencing unit 140, V is the volume of the expansion cavity, that is, the volume of the silencing cavity 111 corresponding to the second layer silencing unit 150, and l1 is the length of the silencing cavity 111 corresponding to the first layer silencing unit 140 along the second direction Y.

[0083] The noise reduction of the expansion cavity satisfies:

[0084] in, Where m is the expansion ratio, S1 is the inlet cross-sectional area of ​​the expansion cavity, i.e., the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the first layer silencing unit 140, S2 is the flow cross-sectional area of ​​the expansion cavity, i.e., the flow cross-sectional area of ​​the silencing cavity 111 corresponding to the second layer silencing unit 150, l is the length of the silencing cavity 111 corresponding to the second layer silencing unit 150 along the second direction Y, and k is the wavenumber. .

[0085] The frequency corresponding to the expansion cavity when the maximum noise reduction is achieved satisfies:

[0086] Where c is a coefficient, and l is the length of the silencing cavity 111 corresponding to the second layer silencing unit 150 along the second direction Y.

[0087] The passage frequency of the expansion cavity satisfies:

[0088] Where c is a coefficient, and l is the length of the silencing cavity 111 corresponding to the second layer silencing unit 150 along the second direction Y.

[0089] In some embodiments, such as Figure 6 As shown, the silencing unit 110 includes a cover 120 and a plurality of silencing plates 130. The plurality of silencing plates 130 are installed on the cover 120 and are spaced apart along the first direction X. A silencing cavity 111 is formed between adjacent silencing plates 130.

[0090] In this embodiment, a plurality of sound-absorbing plates 130 are detachably installed between the side plates of the cover 120 facing the third direction Z, dividing the space inside the cover 120 into a plurality of sound-absorbing cavities spaced apart along the first direction X.

[0091] The sound-absorbing sheet 130 can be made of porous sound-absorbing material. The porous sound-absorbing material can absorb the sound wave energy in the airflow. When the sound wave enters the interior of the porous sound-absorbing material through the pores, the sound wave will be absorbed and converted into heat energy, thereby reducing the propagation of noise and achieving the effect of noise reduction.

[0092] In addition, such as Figure 2 , Figure 9 and Figure 10 As shown, the sound-absorbing plate 130 has various structural forms, including but not limited to: Example 1: The cross-section of the sound-absorbing plate 130 can be rectangular.

[0093] like Figure 2 As shown, among the multiple sides of the sound-absorbing plate 130, the side of the sound-absorbing plate 130 directly opposite to the first direction X has the largest surface area and forms a sound-absorbing cavity, which can improve the sound-absorbing efficiency of the sound-absorbing plate 130.

[0094] Example 2: At least a portion of the cross-section of the sound-absorbing plate 130 may be wavy.

[0095] like Figure 9 As shown, at least a portion of the sound-absorbing sheet 130 has a wavy projection along the third direction Z on the side facing the first direction X, which can increase the number of sound wave reflections and achieve a better noise reduction effect.

[0096] Example 3: The cross-section of the sound-absorbing plate 130 can be irregular.

[0097] like Figure 10 As shown, the projection of the side of the sound-absorbing sheet 130 facing the first direction X along the third direction Z is an irregular shape, which can increase the number of sound wave reflections and achieve a better noise reduction effect.

[0098] For example, the thickness of the middle part of the sound-absorbing sheet 130 can be greater than the thickness of the two ends.

[0099] In some embodiments, such as Figure 8 As shown, the sound-absorbing plate 130 is provided with a slot 131, and the cover 120 is provided with a boss 121. The slot 131 is used to limit the engagement with the boss 121.

[0100] In this embodiment, multiple sound-absorbing plates 130 are spaced apart along the first direction X. The side wall of the cover 120 facing the third direction Z is used to install the sound-absorbing plates 130. The side wall of the cover 120 facing the third direction Z has a boss 121 on the inner side. The end of the sound-absorbing plate 130 along the third direction Z has a slot 131. The slot 131 is used to pull and fasten with the boss 121 to realize the detachable installation of the sound-absorbing plate 130.

[0101] When the sound-absorbing plate 130 is installed and disassembled, it can be relatively displaced with the cover 120 along the second direction Y, thereby realizing the assembly and separation of the sound-absorbing plate 130 and the cover 120.

[0102] In addition, the end of the muffler 130 along the second direction Y may be provided with a lifting structure to reduce the difficulty of disassembling the muffler 130.

[0103] In some embodiments, such as Figure 6 and Figure 7 As shown, the silencing device 10 may also include a sealing element 122. The cover 120 is provided with a sealing groove 123 and a drainage groove 124 at one end along the second direction Y. The sealing element 122 is installed in the sealing groove 123, and the drainage groove 124 is connected to the sealing groove 123.

[0104] In this embodiment, a sealing element 122 may be provided between adjacent silencing units 110 and between the silencing unit 110 and the electrical equipment 1 to improve the sealing performance of the silencing device 10.

[0105] The cover 120 of the silencing unit 110 is provided with a sealing groove 123 at the end along the second direction Y. The sealing member 122 can be installed in the sealing groove 123 and the sealing member 122 protrudes from the opening of the sealing groove 123. At the same time, the side of the sealing member 122 away from the sealing groove 123 is used to abut against the adjacent silencing unit 110.

[0106] In addition, the cover 120 is provided with a drainage groove 124 at one end of the sealing groove 123. The drainage groove 124 connects the sealing groove 123 and the outside along the first direction X, and the drainage groove 124 may include multiple drainage grooves, which are spaced apart along the third direction Z.

[0107] In some embodiments, the sound-absorbing sheet 130 includes a substrate and a sound-absorbing member, the substrate having sound-absorbing holes, and the sound-absorbing member facing the sound-absorbing holes.

[0108] In this embodiment, the sound-absorbing sheet 130 may include a substrate and a sound-absorbing component. The substrate is made of materials including, but not limited to, metal, and has sound-absorbing holes. The sound-absorbing component is in contact with the outside world through the sound-absorbing holes. The sound-absorbing component is made of materials including, but not limited to, sound-absorbing cotton, asbestos, and fiber materials. Sound waves are absorbed by the sound-absorbing component through the sound-absorbing holes on the substrate, thereby achieving the purpose of noise reduction.

[0109] This application embodiment also provides an electrical device 1, such as... Figure 1 As shown, electrical equipment 1 includes: The housing 20 forms a receiving cavity, which houses electrical components and a fan, with the fan facing the air outlet. The silencer 10 is installed in the housing 20 and is connected to the receiving cavity through the air outlet. The silencer 10 is used to reduce the noise of the fan.

[0110] In this embodiment, the electrical equipment 1 includes, but is not limited to, energy storage equipment and large energy storage containers. Taking the electrical equipment 1 as an example including a large energy storage container, as shown in the figure, the air inlet of the large energy storage container is located at the bottom, the air outlet of the large energy storage container is located on the side, and the container body 20 forms a receiving cavity at the bottom. The receiving cavity contains at least electrical components and a fan. The fan is used to dissipate heat from the electrical components and will generate noise during operation.

[0111] A silencer 10 is installed outside the air outlet of the electrical equipment 1. The silencer 10 is connected to the receiving cavity through the air outlet. The sound waves generated by the operation of the fan enter the silencer 10 through the air outlet. The sound waves are absorbed and interfered in the silencer 10, thereby achieving the noise reduction effect.

[0112] According to the electrical equipment 1 provided in the embodiments of this application, by installing the silencing device 10 of this application outside the air outlet of the electrical equipment 1, different noise reduction requirements can be met, and noise reduction requirements at specific frequencies can also be met.

[0113] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0114] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0115] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0116] In the description of this application, "multiple" means two or more.

[0117] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0118] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0119] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0120] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A noise reduction device (10) applied to electrical equipment (1), characterized in that, include: A multi-layer silencing unit (110) has a plurality of silencing cavities (111) spaced apart along a first direction (X). The silencing cavities (111) penetrate the silencing unit (110), and the silencing cavities (111) of each layer of the silencing unit (110) are connected to form a silencing channel. The multiple layers of silencing units (110) are stacked along the second direction (Y). Each layer of silencing unit (110) is at least one of multiple types of silencing units. The silencing frequencies corresponding to any two types of silencing units are different. The first direction (X) intersects with the second direction (Y).

2. The silencing device (10) according to claim 1, characterized in that, The flow cross-sectional area of ​​the silencing cavity (111) corresponding to one type of silencing unit is larger than the flow cross-sectional area of ​​the silencing cavity (111) corresponding to the other type of silencing unit; or, The projection of the silencing cavity (111) corresponding to one type of silencing unit along the second direction (Y) is offset from the projection of the silencing cavity (111) corresponding to another type of silencing unit along the second direction (Y); or, The normals of the silencing cavities (111) corresponding to any two types of silencing units form an angle.

3. The silencing device (10) according to claim 2, characterized in that, The silencing device (10) includes a first to a third layer of silencing units (140-160), wherein the flow cross-sectional area of ​​the silencing cavity (111) corresponding to the first layer of silencing unit (140) is smaller than the flow cross-sectional area of ​​the silencing cavity (111) corresponding to the second layer of silencing unit (150), and the flow cross-sectional area of ​​the silencing cavity (111) corresponding to the third layer of silencing unit (160) is smaller than the flow cross-sectional area of ​​the silencing cavity (111) corresponding to the second layer of silencing unit (150).

4. The silencing device (10) according to claim 2, characterized in that, The opening direction of the silencing cavity (111) corresponding to the outermost silencing unit (110) is different from the opening direction of the silencing cavity (111) corresponding to the other layers of silencing units (110).

5. The silencing device (10) according to any one of claims 1-4, characterized in that, The silencing unit (110) includes a cover (120) and a plurality of silencing plates (130). The plurality of silencing plates (130) are installed on the cover (120) and are spaced apart along the first direction (X) or the third direction (Z). The silencing cavity (111) is formed between adjacent silencing plates (130).

6. The silencing device (10) according to claim 5, characterized in that, The silencing device (10) further includes a sealing element (122). The cover (120) is provided with a sealing groove (123) and a drainage groove (124) at one end along the second direction (Y). The sealing element (122) is installed in the sealing groove (123), and the drainage groove (124) is connected to the sealing groove (123).

7. The silencing device (10) according to claim 5, characterized in that, The sound-absorbing sheet (130) includes a substrate and a sound-absorbing component. The substrate has a sound-absorbing hole, and the sound-absorbing component is opposite to the sound-absorbing hole or fills the sound-absorbing hole.

8. The silencing device (10) according to claim 5, characterized in that, At least a portion of the sound-absorbing plate (130) is wavy; or, The thickness of the middle portion of the sound-absorbing sheet (130) is greater than the thickness of the two ends.

9. An electrical device (1), characterized in that, include: The housing (20) forms a receiving cavity, which houses electrical components and a fan. The housing (20) is provided with an air outlet, and the fan faces the air outlet. The silencing device (10) as described in any one of claims 1-8 is installed in the housing (20), the silencing cavity (111) is connected to the air outlet and the external environment, and the silencing device (10) is used to reduce noise for the fan.

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