Noise reduction protection assembly and electrical equipment assembly

Abstract

The utility model discloses a noise reduction protection assembly and an electrical equipment assembly, the ventilation opening of the electrical equipment is arranged along the X-axis direction and is provided with a waterproof shutter, the waterproof shutter is provided with a plurality of waterproof channels which are parallel to each other and incline outwards, and the noise reduction protection assembly comprises a cover body and a noise reduction member. The cover body is arranged at the ventilation opening and is provided with an air passing opening which is opposite to the ventilation opening and is communicated with the outside; the noise reduction part is arranged in the cover body, flow expanding cavities are formed between the noise reduction part and the waterproof shutters at intervals in the X-axis direction, the noise reduction part is provided with a plurality of noise elimination channels distributed at intervals in the Z-axis direction, included angles are formed between the noise elimination channels and the extension direction of the waterproof channels, and each noise elimination channel is located on the extension line of at least one waterproof channel. The electrical equipment assembly comprises electrical equipment and the noise reduction protection assembly. The noise reduction effect is good when the method is applied.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction, specifically to a noise reduction and protection component and an electrical equipment component. Background Technology

[0002] Electrical equipment such as energy storage converters and inverters often generate noise from their internal electrical components during operation, which can negatively impact users over time. While existing electrical equipment often uses sound-absorbing materials to absorb this noise, it's difficult to effectively place these materials inside the equipment, and doing so can also affect the equipment's heat dissipation efficiency. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and to provide a noise reduction and protection component and an electrical equipment component with good noise reduction effect.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Technical Solution 1 and its related embodiments provide a noise reduction and protection component for installation at the ventilation opening of electrical equipment. The ventilation opening is opened along the X-axis and equipped with waterproof louvers. The waterproof louvers have a plurality of parallel and outwardly inclined waterproof channels. The noise reduction and protection component includes a cover installed at the ventilation opening and having an air outlet opposite to the ventilation opening and communicating with the outside; and a noise reduction component placed inside the cover and spaced apart from the waterproof louvers along the X-axis to form a flow-expanding cavity. The noise reduction component has a plurality of sound-absorbing channels spaced apart along the Z-axis. The extension direction of the sound-absorbing channels is perpendicular to that of the waterproof channels, and each sound-absorbing channel is located on the extension line of at least one waterproof channel.

[0006] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the noise reduction component is provided with a plurality of sound-absorbing bodies arranged at intervals along the Z-axis direction, and a sound-absorbing channel is formed between two adjacent sound-absorbing bodies. The sound-absorbing body is provided with a sound-absorbing layer communicating with the sound-absorbing channel, and the length of the sound-absorbing layer along the Z-axis direction is greater than the length of the sound-absorbing channel along the Z-axis direction.

[0007] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the side of the sound-absorbing body near the air outlet is provided with a protective plate that is fixedly connected to the sound-absorbing layer.

[0008] Based on technical solution three, there is also technical solution four. In technical solution four and its related embodiments, the sound-absorbing layer is also opposite to and connected to the flow-expanding cavity.

[0009] Based on any one of technical solutions two to four, a fifth technical solution is also provided. In the fifth technical solution and its related embodiments, the sound-absorbing bodies located at both ends of the noise reduction component along the Z-axis are defined as the first sound-absorbing body, and the remaining sound-absorbing bodies are defined as the second sound-absorbing body. The first sound-absorbing body is fixed to the cover on one side along the Z-axis, and a perforated plate is provided on the other side. The sound-absorbing layer of the first sound-absorbing body is sandwiched between the cover and the perforated plate. The second sound-absorbing body has perforated plates on both sides that are opposite to each other along the Z-axis, and the sound-absorbing layer of the second sound-absorbing body is sandwiched between the two perforated plates.

[0010] Based on technical solution five, technical solution six is ​​also provided. In technical solution six and its related embodiments, the perforated plates of the two first silencing bodies are micro-perforated plates and perforated plate frames, respectively; the two perforated plates of each second silencing body are micro-perforated plates and perforated plate frames, respectively; and the two sides of each silencing channel along the Z-axis are micro-perforated plates and perforated plate frames, respectively.

[0011] Based on technical solution five, there is also technical solution seven. In technical solution seven and its related embodiments, the perforated plates of the two first sound-absorbing bodies are both microperforated plates; the two perforated plates of the second sound-absorbing body are both microperforated plates.

[0012] Based on technical solution two, there is also technical solution eight. In technical solution eight and its related embodiments, the length of the flow-expanding cavity along the X-axis is less than the length of the silencer along the Z-axis and greater than half the length of the silencer channel along the Z-axis.

[0013] Based on technical solution one, there is also technical solution nine. In technical solution nine and its related embodiments, a filter element is also included; the filter element is installed between the noise reduction element and the air outlet; the filter element includes protective cotton and filter screen fixed to each other, and the filter screen is closer to the air outlet than the protective cotton.

[0014] Technical solution ten provides an electrical equipment component, which includes electrical equipment and a noise reduction and protection component as described in any one of technical solutions one to nine. The electrical equipment is provided with a ventilation opening, which is opened along the X-axis and equipped with waterproof louvers. The waterproof louvers are provided with a plurality of parallel and outwardly inclined waterproof channels. The noise reduction and protection component is installed at the ventilation opening.

[0015] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0016] In technical solution one and its preferred embodiments, by installing the noise reduction and protection components at the ventilation openings of electrical equipment, noise reduction can be achieved from the outside of the electrical equipment without the need for sound-absorbing materials inside, thus ensuring the heat dissipation efficiency of the electrical equipment. The noise reduction components are placed inside the enclosure and spaced along the X-axis between them and the waterproof louvers to form a flow-expanding cavity. The flow-expanding cavity can buffer the airflow entering and exiting the ventilation openings. When noise enters the flow-expanding cavity from the waterproof channel, the channel area changes abruptly, causing impedance mismatch of the sound waves, which can easily lead to some sound waves propagating in the reverse direction towards the waterproof louvers, thereby reducing the energy of the sound waves and achieving noise attenuation. Each silencing channel is located at... With one less waterproof channel extension line, meaning each silencing channel has a straight path to at least one waterproof channel, compared to a scheme where some silencing channels and waterproof channels are staggered, this approach offers several advantages. First, it fully utilizes the structure of the waterproof louvers on the electrical equipment to design the noise reduction and protection components. This allows noise from the waterproof louvers to directly enter each silencing channel and be reflected by the noise reduction components, resulting in multiple reflections and increased sound wave energy loss, thus attenuating the noise. Second, it reduces wind resistance between the silencing channels and the waterproof louvers, thereby reducing wind resistance between the air vents and the ventilation openings, which is beneficial for airflow. Furthermore, the noise reduction and protection components also act as a barrier against external wind, sand, rain, and snow entering the ventilation openings, preventing these impurities from entering the electrical equipment and providing protection.

[0017] In the second technical solution and its preferred embodiment, a sound-absorbing channel is formed between two adjacent sound-absorbing bodies at an angle to the extension direction of the waterproof channel. The sound-absorbing body is provided with a sound-absorbing layer that communicates with the sound-absorbing channel. The noise in the sound-absorbing channel can be absorbed and attenuated by the sound-absorbing layer. The length of the sound-absorbing layer along the Z-axis is greater than the length of the sound-absorbing channel along the Z-axis, so that the noise can also be reflected and refracted inside the sound-absorbing layer, resulting in a better noise attenuation effect.

[0018] In technical solution three and its preferred embodiments, the protective plate allows noise within the sound-absorbing layer to be reflected by the protective plate, making it less likely to be transmitted through the air vents, resulting in better noise reduction. Furthermore, the protective plate can prevent impurities such as wind, sand, rain, and snow from entering the sound-absorbing layer and can also prevent direct sunlight from affecting the sound-absorbing layer and causing it to age, thus improving the protective effect of the sound-absorbing layer.

[0019] In the fourth technical solution and its preferred embodiment, the sound-absorbing layer is also opposite to and connected to the flow-expanding cavity. Since the length of the sound-absorbing layer along the Z-axis is greater than the length of the silencing channel along the Z-axis, when the silencing channel is located on the extension line of at least one waterproof channel, the sound-absorbing layer must also be located on the extension line of at least one waterproof channel. This allows noise transmitted from the waterproof channel to directly enter the sound-absorbing layer and be attenuated within it. In addition, the sound-absorbing layer can also attenuate the noise in the flow-expanding cavity, resulting in excellent noise attenuation.

[0020] In technical solution five and its preferred embodiments, the first silencing body is fixed to the cover on one side along the Z-axis, and a perforated plate is provided on the other side. The sound-absorbing layer of the first silencing body is sandwiched between the cover and the perforated plate, and the cover can reflect the noise inside the first silencing body. The second silencing body has perforated plates on its two opposite sides along the Z-axis, and the sound-absorbing layer of the second silencing body is sandwiched between the two perforated plates. The perforated plates in the first and second silencing bodies allow the sound-absorbing layer to communicate with the silencing channel, thereby allowing the sound-absorbing layer to absorb and attenuate the noise in the silencing channel. The perforated plates can also attenuate noise through reflection. Therefore, both the first and second silencing bodies can achieve noise absorption and reflection, resulting in excellent noise attenuation. In practical applications, the material and wall thickness of the perforated plates can be designed for different noise source frequencies, and corresponding perforation ratios, perforation diameters, and resonant frequencies can be designed on the perforated plates.

[0021] In technical solution six and its related embodiments, the perforated plates of the two first silencing bodies are micro-perforated plates and perforated plate frames, respectively; the two perforated plates of each second silencing body are micro-perforated plates and perforated plate frames, respectively; each silencing channel has micro-perforated plates and perforated plate frames on both sides along the Z-axis, wherein the perforated plate frame is generally a grid structure, which can both fix the sound-absorbing layer and reflect the noise in the silencing channel to a certain extent. Since each silencing channel has micro-perforated plates and perforated plate frames on both sides along the Z-axis, the noise in the silencing channel can enter the sound-absorbing layer through the gaps in the perforated plate frames and be reflected by the micro-perforated plates or the cover. Compared with the silencing channel having micro-perforated plates or perforated plate frames on both sides along the Z-axis, the noise attenuation effect is more uniform.

[0022] In technical solution seven and its related embodiments, the perforated plates of the two first sound-absorbing bodies are both micro-perforated plates; the two perforated plates of the second sound-absorbing body are both micro-perforated plates. Noise passing through the two micro-perforated plates and entering the sound-absorbing layer of the second sound-absorbing body can form a resonance effect. At this time, the sound-absorbing layer is the resonance cavity of the noise, and the noise attenuation effect is good. Moreover, the setting of the two micro-perforated plates makes the wind resistance in the sound-absorbing channel small, and the wind resistance between the air outlet and the ventilation opening small.

[0023] In technical solution eight and its related embodiments, the length of the flow-expanding cavity along the X-axis is less than the length of the silencer along the Z-axis and greater than half the length of the silencer channel along the Z-axis, which can avoid excessive wind resistance.

[0024] In technical solution nine and its related embodiments, the filter element prevents wind, sand, rain, and snow from entering the ventilation opening, thus improving the protection of electrical equipment. The filter element includes protective cotton and a filter screen fixed to each other. Compared with the protective cotton, the filter screen is closer to the air vent, providing better protection and also absorbing and reflecting noise, further improving the noise attenuation effect.

[0025] Technical solution ten has the technical advantages of any one of technical solutions one through nine. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of an electrical equipment assembly according to an embodiment of this application;

[0028] Figure 2 for Figure 1 Sectional view along the AA direction;

[0029] Figure 3 This is a schematic diagram of the noise reduction and protection component according to an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the noise reduction device according to an embodiment of this application;

[0031] Figure 5 for Figure 3 Side view;

[0032] Figure 6 for Figure 5 Sectional view in the BB direction;

[0033] Figure 7 This is a schematic diagram of the second silencer in an embodiment of this application. Figure 1 ;

[0034] Figure 8 This is a schematic diagram of the second silencer in an embodiment of this application. Figure 2 .

[0035] Explanation of key figure labels:

[0036] Electrical equipment 10; Ventilation opening 11; Waterproof louvers 12; Waterproof channel 01; Cover 20; Air vent 21; Noise reduction component 30; Connecting plate 31; Sound absorber 40; Sound absorption layer 41; Microperforated plate 42; Perforated plate frame 43; Protective plate 44; Fixing plate 45; First sound absorber 46; Second sound absorber 47; Flow expansion cavity 02; Sound absorption channel 03; Filter component 50; Filter screen 51; Protective cotton 52. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0038] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0039] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does 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 limiting the specific protection scope of this utility model.

[0040] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0041] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0042] In the claims and the description other than the embodiments, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" only refer to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require that they be implemented according to the "X-axis direction," "Y-axis direction," and "Z-axis direction" described in the embodiments. In the embodiments, the X-axis direction is perpendicular to both the Y-axis direction and the Z-axis direction. Exemplarily, the X-axis direction can be divided into left and right, the Y-axis direction can be divided into front and back, and the Z-axis direction can be divided into up and down.

[0043] See Figure 1-2 , Figure 1 An electrical equipment assembly is shown. Figure 2 A cross-sectional view of an electrical equipment assembly is shown. The assembly includes electrical equipment 10 and a noise reduction and protection component. The electrical equipment 10 has a ventilation opening 11, which is opened along the X-axis and has waterproof louvers 12. The waterproof louvers 12 have several parallel and outwardly inclined waterproof channels 01. In this embodiment, the waterproof louvers 12 are formed by several inverted V-shaped blades. The noise reduction and protection component is installed at the ventilation opening 11. In this embodiment, the electrical equipment 10 is in the form of an electrical cabinet, and the ventilation opening 11 is located on the side wall of the electrical equipment 10.

[0044] See Figure 2 The noise reduction and protection component includes a cover 20, a noise reduction component 30, and a filter component 50. The cover 20 is installed at the vent 11 and has an air vent 21 that is opposite to the vent 11 and communicates with the outside. For example, the cover 20 is made of sheet metal and is a box-shaped structure that opens along the X-axis. The edge of the box-shaped structure has a flange edge that is fixed to electrical equipment.

[0045] See Figure 2 The noise reduction component 30 is placed inside the cover 20 and forms a flow-expanding cavity 02 with the waterproof louvers 12 along the X-axis direction. See [reference needed]. Figure 3 , Figure 3 A schematic diagram of a noise reduction and protection assembly is shown. The noise reduction component 30 has several sound-absorbing elements 40 spaced apart along the Z-axis. A sound-absorbing channel 03 is formed between two adjacent sound-absorbing elements 40. (See also...) Figure 2 The silencing channel 03 and the waterproof channel 01 extend at an angle, meaning the noise reduction component 30 has several silencing channels 03 spaced apart along the Z-axis, and each silencing channel 03 is located on the extension line of at least one waterproof channel 01. In this embodiment, the length of the flow-expanding cavity 02 along the X-axis is less than the length of the silencing body 40 along the Z-axis but greater than half the length of the silencing channel 03 along the Z-axis. See also... Figure 4 In addition to the silencer 40, the noise reduction component 30 also includes two connecting plates 31 arranged along the Y-axis and extending along the Z-axis. The two connecting plates 31 are located at both ends of each silencer 40 along the Y-axis and are fixedly connected to each silencer 40. The connecting plates 31 are also fixedly connected to the cover 20, thereby fixing the noise reduction component 30 to the cover 20. Accordingly, see Figure 7-8 , Figure 7-8 The structure of the muffler 40 is shown. The muffler 40 is also provided with a fixing plate 45 at both ends along the Y-axis. The fixing plate 45 is used to fix to the corresponding connecting plate 31 so that the position of each muffler 40 is relatively fixed.

[0046] For example, the sound-absorbing body 40 extends along the X-axis direction. The sound-absorbing body 40 is used to absorb and reflect sound waves in the sound-absorbing channel 03. However, it should be understood that the sound-absorbing body 40 may also be arc-shaped, sawtooth-shaped or other shapes. This embodiment does not limit this.

[0047] See Figure 5-6 , Figure 5 A side view of the noise reduction and protection components is shown. Figure 6 A cross-sectional view of the noise reduction and protection assembly is shown. The silencer 40 is provided with a sound-absorbing layer 41 communicating with the silencer channel 03. The length of the sound-absorbing layer 41 along the Z-axis is greater than the length of the silencer channel 03 along the Z-axis. The sound-absorbing layer 41 is also opposite to and communicates with the flow-expanding cavity 02. Exemplarily, the sound-absorbing layer 41 is made of fibrous sound-absorbing material or granular sound-absorbing material. A protective plate 44 fixedly connected to the sound-absorbing layer 41 is provided on the side of the silencer 40 near the air outlet 21. The noise-absorbing bodies 40 located at both ends of the noise-reducing component 30 along the Z-axis are defined as first noise-absorbing bodies 46, and the remaining noise-absorbing bodies 40 are defined as second noise-absorbing bodies 47. One side of the first noise-absorbing body 46 along the Z-axis is fixed to the cover 20, and the other side is provided with a perforated plate. The sound-absorbing layer 41 of the first noise-absorbing body 46 is sandwiched between the cover 20 and the perforated plate. The second noise-absorbing bodies 47 have perforated plates on opposite sides along the Z-axis, and the sound-absorbing layer 41 of the second noise-absorbing body 47 is sandwiched between the two perforated plates. In this embodiment, the perforated plates of the two first noise-absorbing bodies 46 are micro-perforated plates 42 and perforated plate frames 43, and the perforated plate frame 43 is a grid structure in practical applications. The two perforated plates of each second noise-absorbing body 47 are micro-perforated plates 42 and perforated plate frames 43, respectively. The two sides of each noise-absorbing channel 03 along the Z-axis are micro-perforated plates 42 and perforated plate frames 43, respectively. See also [reference needed] in this embodiment. Figure 7-8 The protective plate 44 of the second sound-absorbing body 47 is integrated with the micro-perforated plate 42 and the perforated plate frame 43. The projection of the micro-perforated plate 42 onto the projection plane perpendicular to the Z-axis direction covers the sound-absorbing layer 41, and the projection of the protective plate 44 onto the projection plane perpendicular to the X-axis direction also covers the sound-absorbing layer 41. For example, the protective plate 44, micro-perforated plate 42, and perforated plate frame 43 can be made of metal. Similarly, the protective plate 44 of the first sound-absorbing body 46 is integrated with the perforated plate frame 43 or the micro-perforated plate 42. The projection of the micro-perforated plate 42 onto the projection plane perpendicular to the Z-axis direction covers the sound-absorbing layer 41, and the projection of the protective plate 44 onto the projection plane perpendicular to the X-axis direction also covers the sound-absorbing layer 41. Therefore, in this embodiment, the first sound-absorbing body 46 extends along the X-axis direction, which also facilitates the processing of the micro-perforated plate 42, the perforated plate frame 43, and the protective plate 44. In practical applications, the material and wall thickness of the microperforated plate 42 can be designed for different noise source frequencies, and the corresponding perforation rate, perforation diameter and resonant frequency can be designed on the microperforated plate 42.

[0048] It should be understood that, in addition to the above-described embodiments, the perforated plate of the first sound-absorbing body 46 can also be a micro-perforated plate 42; both perforated plates of the second sound-absorbing body 47 are micro-perforated plates 42. Noise passing through the two micro-perforated plates 42 and entering the sound-absorbing layer 41 of the second sound-absorbing body 47 can form a resonance effect. At this time, the sound-absorbing layer 41 is a resonance cavity for noise, with good noise attenuation effect. Moreover, the arrangement of the two micro-perforated plates 42 makes the wind resistance in the sound-absorbing channel 03 small, and the wind resistance between the air outlet 21 and the ventilation outlet 11 small.

[0049] See Figure 6 The filter element 50 is installed between the noise reduction element 30 and the air outlet 21. The filter element 50 includes a protective cotton 52 and a filter screen 51 that are fixed to each other. The filter screen 51 is closer to the air outlet 21 than the protective cotton 52.

[0050] In this embodiment, by installing the noise reduction and protection component at the ventilation opening 11 of the electrical equipment, noise reduction can be achieved from the outside of the electrical equipment without the need to place sound-absorbing materials inside the electrical equipment, thus ensuring the heat dissipation efficiency of the electrical equipment. The noise reduction component 30 is placed inside the cover 20 and forms a flow-expanding cavity 02 with the waterproof louvers 12 along the X-axis. The flow-expanding cavity 02 can buffer the airflow entering and exiting the ventilation opening 11. When noise enters the flow-expanding cavity 02 from the waterproof channel 01, the channel area changes abruptly, and the impedance of the sound wave is mismatched, which can easily cause some sound waves to propagate in the reverse direction to the waterproof louvers 12, thereby reducing the energy of the sound wave and playing a role in noise attenuation. Each silencing channel 03 is located at at least one waterproof channel. On the extension line of channel 01, that is, there is a straight path between each silencing channel 03 and at least one waterproof channel 01. Compared with the scheme where some silencing channels 03 and waterproof channels 01 are staggered, on the one hand, the structure of the waterproof louvers 12 of the electrical equipment is fully utilized for the design of the noise reduction and protection components. This facilitates the direct entry of noise from the waterproof louvers 12 into each silencing channel 03, where it is reflected by the noise reduction components 30, allowing the noise to be reflected multiple times, increasing the energy loss of the sound waves and thus attenuating the noise. On the other hand, it also reduces the wind resistance between the silencing channels 03 and the waterproof louvers 12, thereby reducing the wind resistance between the air vent 21 and the ventilation opening 11, which is beneficial for airflow. In addition, the noise reduction and protection components also act as a barrier to the entry of external wind, sand, rain, snow, etc., into the ventilation opening 11, preventing these impurities from entering the electrical equipment and providing protection for the electrical equipment.

[0051] In this embodiment, a sound-absorbing channel 03 is formed between two adjacent sound-absorbing bodies 40 at an angle to the extension direction of the waterproof channel 01. The sound-absorbing body 40 is provided with a sound-absorbing layer 41 that communicates with the sound-absorbing channel 03. The noise in the sound-absorbing channel 03 can be absorbed and attenuated by the sound-absorbing layer 41. The length of the sound-absorbing layer 41 along the Z-axis is greater than the length of the sound-absorbing channel 03 along the Z-axis, so that the noise can also be reflected and refracted inside the sound-absorbing layer 41, and the noise attenuation effect is better.

[0052] In this embodiment, the protective plate 44 is set so that the noise in the sound-absorbing layer 41 can be reflected by the protective plate 44 and is not easy to be transmitted through the air vent 21, resulting in better noise reduction effect. In addition, the protective plate 44 can also prevent impurities such as wind, sand, rain and snow from entering the sound-absorbing layer 41 and can also prevent direct sunlight from shining on the sound-absorbing layer 41, which will cause the sound-absorbing layer 41 to age, thus improving the protective effect of the sound-absorbing layer 41.

[0053] In this embodiment, the sound-absorbing layer 41 is also opposite to and connected to the flow-expanding cavity 02. Since the length of the sound-absorbing layer 41 along the Z-axis is greater than the length of the silencing channel 03 along the Z-axis, when the silencing channel 03 is located on the extension line of at least one waterproof channel 01, the sound-absorbing layer 41 must also be located on the extension line of at least one waterproof channel 01. This allows the noise transmitted from the waterproof channel 01 to directly enter the sound-absorbing layer 41 and be attenuated within the sound-absorbing layer 41. In addition, the sound-absorbing layer 41 can also attenuate the noise in the flow-expanding cavity 02, resulting in excellent noise attenuation.

[0054] In this embodiment, the first silencing body 46 is fixed to the cover 20 on one side along the Z-axis, and a perforated plate is provided on the other side. The cover 20 can reflect the noise inside the first silencing body 46. The sound-absorbing layer 41 of the first silencing body 46 is sandwiched between the cover 20 and the perforated plate. The second silencing body 47 has perforated plates on its two opposite sides along the Z-axis. The sound-absorbing layer 41 of the second silencing body 47 is sandwiched between the two perforated plates. The perforated plates in the first silencing body 46 and the second silencing body 47 allow the sound-absorbing layer 41 to communicate with the silencing channel 03, so that the sound-absorbing layer 41 can absorb and attenuate the noise in the silencing channel 03. The perforated plates can also attenuate noise through reflection. Therefore, both the first silencing body 46 and the second silencing body 47 can absorb and reflect noise, resulting in excellent noise attenuation.

[0055] In this embodiment, the perforated plates of the two first sound-absorbing bodies 46 are micro-perforated plates 42 and perforated plate frames 43, respectively; the two perforated plates of each second sound-absorbing body 47 are micro-perforated plates 42 and perforated plate frames 43, respectively; the two sides of each sound-absorbing channel 03 along the Z-axis direction are micro-perforated plates 42 and perforated plate frames 43, respectively. The perforated plate frame 43 is generally a grid structure. The perforated plate frame 43 can not only fix the sound-absorbing layer 41, but also reflect the noise in the sound-absorbing channel 03 to a certain extent. Compared with the sound-absorbing channel 03 having micro-perforated plates 42 or perforated plate frames 43 on both sides along the Z-axis direction, the noise attenuation effect is more uniform.

[0056] In this embodiment, the length of the flow-expanding cavity 02 along the X-axis is less than the length of the silencer 40 along the Z-axis and greater than half the length of the silencer channel 03 along the Z-axis, which can avoid excessive wind resistance.

[0057] In this embodiment, the filter element 50 prevents wind, sand, rain, snow, and other pollutants from entering the ventilation opening 11, thus improving the protection of electrical equipment. The filter element 50 includes a protective cotton 52 and a filter screen 51 fixedly connected to each other. The filter screen 51 is closer to the air outlet 21 than the protective cotton 52, providing better protection and also absorbing and reflecting noise, further improving the noise attenuation effect.

[0058] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A noise reduction and protection component for installation in a ventilation opening (11) of electrical equipment, the ventilation opening (11) being opened along the X-axis and equipped with waterproof louvers (12), the waterproof louvers (12) having a plurality of parallel and outwardly inclined waterproof channels (01), characterized in that, The noise reduction and protection components include The cover (20) is installed at the vent (11) and has an air vent (21) that is opposite to the vent (11) and communicates with the outside. The noise reduction component (30) is placed inside the cover (20) and forms a flow-expanding cavity (02) with the waterproof louvers (12) along the X-axis direction. The noise reduction component (30) is provided with a plurality of sound-absorbing channels (03) arranged at intervals along the Z-axis direction. The sound-absorbing channels (03) and the extension directions of the waterproof channels (01) are at an angle, and each sound-absorbing channel (03) is located on the extension line of at least one waterproof channel (01).

2. The noise reduction and protection component as described in claim 1, characterized in that, The noise reduction component (30) is provided with a plurality of silencers (40) spaced apart along the Z-axis direction. The silencer channel (03) is formed between two adjacent silencers (40). The silencer (40) is provided with a sound-absorbing layer (41) that communicates with the silencer channel (03). The length of the sound-absorbing layer (41) along the Z-axis direction is greater than the length of the silencer channel (03) along the Z-axis direction.

3. The noise reduction and protection component as described in claim 2, characterized in that, The silencer (40) has a protective plate (44) fixed to the sound-absorbing layer (41) on the side near the air outlet (21).

4. A noise reduction and protection component as described in claim 3, characterized in that, The sound-absorbing layer (41) is also opposite to and connected to the flow-expanding cavity (02).

5. A noise reduction and protection component as described in any one of claims 2-4, characterized in that, a definition is provided. The first silencer (46) is located at both ends of the noise reduction component (30) along the Z-axis direction among the silencers (40), and the remaining silencers (40) are the second silencers (47). The first silencer (46) is fixed to the cover (20) on one side along the Z-axis direction, and has a perforated plate on the other side. The sound-absorbing layer (41) of the first silencer (46) is sandwiched between the cover (20) and the perforated plate. The second silencer (47) has perforated plates on both sides that are opposite to each other along the Z-axis direction, and the sound-absorbing layer (41) of the second silencer (47) is sandwiched between the two perforated plates.

6. A noise reduction and protection component as described in claim 5, characterized in that, The perforated plates of the two first silencers (46) are a micro-perforated plate (42) and a perforated plate frame (43), respectively; the two perforated plates of each second silencer (47) are a micro-perforated plate (42) and a perforated plate frame (43), respectively; the two sides of each silencer channel (03) along the Z-axis are a micro-perforated plate (42) and a perforated plate frame (43), respectively.

7. A noise reduction and protection component as described in claim 5, characterized in that, Both of the first silencers (46) have microporous plates (42); both of the second silencers (47) have microporous plates (42).

8. A noise reduction and protection component as described in claim 2, characterized in that, The length of the amplification cavity (02) along the X-axis is less than the length of the silencer (40) along the Z-axis and greater than half the length of the silencer channel (03) along the Z-axis.

9. A noise reduction and protection component as described in claim 1, characterized in that, It also includes a filter element (50); the filter element (50) is installed between the noise reduction element (30) and the air outlet (21); the filter element (50) includes a protective cotton (52) and a filter screen (51) fixed to each other, the filter screen (51) being closer to the air outlet (21) than the protective cotton (52).

10. An electrical equipment assembly, characterized in that, It includes electrical equipment and a noise reduction and protection component according to any one of claims 1-9, wherein the electrical equipment is provided with a vent (11), the vent (11) is opened along the X-axis and is equipped with a waterproof louver (12), the waterproof louver (12) is provided with a plurality of waterproof channels (01) that are parallel to each other and inclined outward; the noise reduction and protection component is installed at the vent (11).

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