Noise reduction cabinet

Abstract

The utility model discloses a noise reduction cabinet which is provided with an air outlet channel, two ends of the air outlet channel are respectively provided with an air inlet and an air outlet, the air inlet is supplied with air by a first heat dissipation fan, a baffle plate is arranged in the air outlet channel to change the air passing area of the air outlet channel, and the baffle plate is obliquely arranged along the air outlet direction. According to the noise reduction cabinet, the noise transmitted from the interior of the noise reduction cabinet can be reduced, and the heat dissipation efficiency of the noise reduction cabinet is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, specifically to a noise reduction cabinet. Background Technology

[0002] Electrical equipment such as energy storage converters and inverters generate a lot of heat when their internal electrical components are working. Cooling fans are usually installed inside the electrical equipment to draw the heat out of the equipment. However, the cooling fans generate a lot of noise when they are working, which affects the user experience. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background technology and provide a noise reduction cabinet that can reduce the noise transmitted from inside the noise reduction cabinet while ensuring the heat dissipation efficiency of the noise reduction cabinet.

[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 one and its related embodiments provide a noise reduction cabinet, which is provided with an air outlet channel. The two ends of the air outlet channel are respectively provided with an air inlet and an air outlet. The air inlet is supplied with air by a first cooling fan. The air outlet channel is provided with a baffle to change the air passage area of ​​the air outlet channel. The baffle is inclined along the air outlet direction.

[0006] Based on technical solution one, there is also technical solution two. In technical solution two and its related embodiments, the minimum cross-sectional area of ​​the air outlet channel is greater than the cross-sectional area of ​​the air inlet.

[0007] Based on technical solution two, there is also technical solution three. In technical solution three and its related embodiments, the number of baffles is at least two. Each baffle is distributed at intervals on the channel wall of the air outlet channel along the extension direction of the air outlet channel, and two adjacent baffles protrude from the two opposite channel walls of the air outlet channel.

[0008] Based on technical solution three, there is also technical solution four. In technical solution four and its related embodiments, two adjacent baffles located on the same channel wall are parallel to each other, and the extending directions of two adjacent baffles located on opposite channel walls intersect each other.

[0009] Based on technical solution four, there is also technical solution five. In technical solution five and its related embodiments, the channel wall of the air outlet channel is provided with a first air guide wall near the air inlet, and each baffle has a first baffle that is parallel to and opposite to the first air guide wall.

[0010] Based on technical solution four, there is also technical solution six. In technical solution six and its related embodiments, the minimum cross-sectional area of ​​the air outlet channel is greater than the cross-sectional area of ​​the air outlet, and the channel wall of the air outlet channel is provided with a second air guide wall that is inclined along the air outlet direction near the air outlet.

[0011] Based on technical solution one, there is also technical solution seven. In technical solution seven and its related embodiments, a first sound-absorbing layer is fixedly attached to the channel wall of the air outlet channel.

[0012] Based on technical solution seven, there is also technical solution eight. In technical solution eight and its related embodiments, the baffle includes a second sound-absorbing layer and a connecting plate fixedly connected to each other. The connecting plate is fixedly connected to the channel wall of the air outlet channel. The second sound-absorbing layer faces the air inlet, and the connecting plate faces the air outlet.

[0013] Based on any one of technical solutions one to eight, a technical solution nine is also provided. In technical solution nine and its related embodiments, a first enclosure and a noise reduction component are further included. The noise reduction cabinet is also provided with a first ventilation opening communicating with the outside along the X-axis direction. The first enclosure is installed at the ventilation opening and is provided with an air passage opposite to the first ventilation opening and communicating with the outside. The noise reduction component is placed inside the enclosure and is provided with a plurality of sound-absorbing channels arranged along the Z-axis direction. The air outlet channel is located inside the noise reduction cabinet and its air outlet is connected to the first ventilation opening.

[0014] Based on technical solution nine, technical solution ten is also provided. In technical solution ten and its related embodiments, a second cover is also included; the noise reduction cabinet is also provided with a second ventilation opening that communicates with the outside and is opened along the X-axis direction, and the second ventilation opening is supplied with air by a second cooling fan; the second cover is provided at the second ventilation opening and is provided with a windproof wall opposite to the second ventilation opening, a third sound-absorbing layer is fixedly connected to the windproof wall, and the windproof wall is provided with an exhaust port, and the exhaust port and the second ventilation opening are offset from each other on the projection plane perpendicular to the X-axis direction.

[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, the baffle is inclined along the air outlet direction. This inclination includes not only the inclination of planar structures but also the inclination of curved structures such as arcs. The baffle within the air outlet channel alters the airflow area. As noise from the first cooling fan propagates within the air outlet channel, the change in channel cross-sectional area causes impedance mismatch in the sound waves, leading to reflection and attenuation of noise intensity, thus achieving a noise reduction effect. Furthermore, the baffle extends the sound wave propagation path, also contributing to noise reduction. The baffle's inclination along the air outlet direction, compared to a baffle perpendicular to the air outlet direction, effectively guides airflow within the air outlet channel, reducing wind resistance and facilitating airflow. This prevents heat buildup inside the noise-reducing cabinet, ensuring its heat dissipation efficiency. Therefore, the noise-reducing cabinet of this application achieves good noise reduction while maintaining heat dissipation efficiency.

[0017] In the second technical solution and its preferred embodiment, the minimum cross-sectional area of ​​the air outlet channel is greater than the cross-sectional area of ​​the air inlet. On the one hand, when the airflow enters the air outlet channel from the air inlet, the wind resistance is small, which is beneficial to the air delivery of the first cooling fan. On the other hand, it also causes the sound waves of the noise to be reflected due to the impedance mismatch caused by the change in the cross-sectional area of ​​the channel when the noise enters the air outlet channel from the air inlet, which further causes the noise intensity to be attenuated and thus achieves a noise reduction effect.

[0018] In technical solution three and its preferred embodiments, the number of baffles is at least two. Each baffle is distributed at intervals on the channel wall of the air outlet channel along the extension direction of the air outlet channel, and two adjacent baffles protrude from the two opposite channel walls of the air outlet channel, which prolongs the propagation path of the sound wave and increases the number of noise reflections, thereby further increasing the noise reduction effect.

[0019] In technical solution four and its preferred embodiments, two adjacent baffles located on the same channel wall are parallel to each other, and the extension directions of two adjacent baffles located on opposite channel walls intersect each other. Compared with the solution where all baffles are parallel to each other, this is more conducive to guiding the airflow, thereby further reducing wind resistance and facilitating the air outlet of the air outlet channel, thus ensuring the heat dissipation efficiency of the noise reduction cabinet.

[0020] In technical solution five and its preferred embodiments, the air outlet channel is provided with a first air guide wall near the air inlet, and each baffle has a first baffle that is parallel to and opposite to the first air guide wall. This is more conducive to guiding the airflow entering the air outlet channel from the air inlet, thereby reducing wind resistance. In addition, it is also conducive to the reflection of noise on the first air guide wall and the first baffle, as well as the reflection after passing through the first air guide wall and the first baffle, thus being more conducive to noise attenuation.

[0021] In technical solution six and its preferred embodiments, the minimum cross-sectional area of ​​the air outlet channel is greater than the cross-sectional area of ​​the air outlet. Combined with the fact that the minimum cross-sectional area of ​​the air outlet channel is greater than the cross-sectional area of ​​the air inlet, the air outlet channel is an expanded channel, resulting in better noise reduction. The channel wall of the air outlet channel is provided with a second air guide wall that is inclined along the air outlet direction near the air outlet, which is more conducive to guiding the airflow in the air outlet channel to the air outlet, resulting in less wind resistance.

[0022] In technical solution seven and its preferred embodiment, a first sound-absorbing layer is fixed to the channel wall of the air outlet channel, so that the channel wall of the air outlet channel can also absorb noise, thereby further increasing the noise attenuation effect.

[0023] In technical solution eight and its preferred embodiment, the baffle includes a second sound-absorbing layer and a connecting plate fixedly connected to each other. The connecting plate is fixedly connected to the channel wall of the air outlet channel. Since the connecting plate is easier to process and has better rigidity, it is more conducive to the installation of the baffle by fixing the connecting plate to the channel wall of the air outlet channel. The second sound-absorbing layer facing the air inlet is conducive to the absorption of noise, and the connecting plate facing the air outlet is conducive to the guidance of airflow, thereby reducing wind resistance and increasing the noise attenuation effect.

[0024] In technical solution nine and its preferred embodiments, the first cover and noise reduction component can further attenuate the noise at the air outlet of the air outlet channel. At the same time, the first cover and noise reduction component can also prevent impurities such as wind, sand, rain and snow from entering the noise reduction cabinet, thus improving the protection of the noise reduction cabinet.

[0025] In technical solution ten and its preferred embodiment, a second cover is installed over the second ventilation opening and has a windbreak wall opposite to the second ventilation opening. A third sound-absorbing layer is fixed to the windbreak wall. The windbreak wall has an exhaust port, and the exhaust port and the second ventilation opening are offset from each other on the projection plane perpendicular to the X-axis. This allows the noise emitted from the second ventilation opening to be reflected by the windbreak wall and absorbed by the third sound-absorbing layer before being discharged through the exhaust port, resulting in excellent noise attenuation. Furthermore, because the exhaust port and the second ventilation opening are offset from each other on the projection plane perpendicular to the X-axis, the propagation path of the sound waves is extended, further increasing the noise attenuation effect. In addition, the second cover also improves the protection of the second ventilation opening. 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 side view of the noise reduction cabinet according to an embodiment of this application;

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

[0029] Figure 3 This is a schematic diagram of the air outlet component in an embodiment of this application. Figure 1 ;

[0030] Figure 4 This is a schematic diagram of the air outlet component in an embodiment of this application. Figure 2 ;

[0031] Figure 5 for Figure 3 Front view;

[0032] Figure 6 for Figure 5 Sectional view along the AA direction;

[0033] Figure 7 for Figure 5 Sectional view in the BB direction.

[0034] Explanation of key figure labels:

[0035] Cabinet 10; First ventilation opening 11; Second ventilation opening 12; Waterproof louvers 13; Waterproof channel 01; First cooling fan 21; Second cooling fan 22; Third cooling fan 23; Air outlet 30; Air outlet channel 31; Air inlet 311; Air outlet 312; First channel wall 313; Second channel wall 314; First air guide wall 315; Second air guide wall 316; First sound-absorbing layer 32; Baffle 33; Second sound-absorbing layer 331; Connecting plate 332; Connecting edge 333; First baffle 34; First cover 40; Air vent 41; Noise reduction component 50; Silencing channel 02; Air expansion cavity 03; Second cover 60; Windproof wall 61; Exhaust vent 611; Third sound-absorbing layer 62; First filter 70; Second filter 80. Detailed Implementation

[0036] 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.

[0037] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0038] 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.

[0039] 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, that is, any connection in which there is no displacement relationship or relative rotation relationship between the two, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0040] 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".

[0041] In the claims and description of this utility model, excluding the embodiments, the terms "X-axis direction," "Y-axis direction," and "Z-axis direction" merely refer to a feature having one of the aforementioned directions being perpendicular to a feature having another direction, and do not require implementation 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 into front and back, and the Z-axis direction into up and down.

[0042] See Figure 1-2 , Figure 1 The noise reduction cabinet is shown. Figure 2 A cross-sectional view of a noise reduction cabinet is shown. The noise reduction cabinet includes a cabinet body 10, a first cooling fan 21, a second cooling fan 22 and a third cooling fan 23, an air outlet 30, a first cover 40, a noise reduction component 50, a second cover 60, a first filter 70 and a second filter 80.

[0043] The cabinet 10 is rectangular in shape. Exemplarily, the length of the cabinet 10 is along the X-axis, the width along the Y-axis, and the height along the Z-axis. The cabinet 10 has two opposite side walls along the X-axis, each with a first ventilation opening 11 and a second ventilation opening 12 communicating with the outside. Both the first and second ventilation openings 11 and 12 are located along the X-axis. That is, the noise-reducing cabinet also has a first ventilation opening 11 communicating with the outside along the X-axis, and a second ventilation opening 12 communicating with the outside and located along the X-axis. In this embodiment, waterproof louvers 13 are installed at both the first and second ventilation openings 11 and 12. The waterproof louvers 13 in this embodiment are formed by several inverted V-shaped blades, and each waterproof louver 13 has several parallel and outwardly inclined waterproof channels 01. The first cooling fan 21, the second cooling fan 22, and the third cooling fan 23 are all installed inside the cabinet 10. The first cooling fan 21 and the second cooling fan 22 are both installed at the top of the cabinet 10 with air inlet at the bottom and air outlet at the side. The first cooling fan 21 and the second cooling fan 22 are at the same height and adjacent to each other. The third cooling fan 23 is located below the first cooling fan 21 with air inlet at the bottom and air outlet at the side. In this embodiment, the first cooling fan 21 is connected to the first ventilation port 11 through the air outlet 30, the third cooling fan 23 is indirectly connected to the first ventilation port 11, and the second cooling fan 22 is connected to the second air outlet 312 through its fan box. The first cooling fan 21 and the third cooling fan 23 drive the hot air inside the cabinet 10 to be discharged through the first ventilation port 11, and the second cooling fan 22 drives the hot air inside the cabinet 10 to be discharged through the second ventilation port 12.

[0044] The air outlet component 30 is placed inside the cabinet 10 and forms an air outlet channel 31, that is, the air outlet channel 31 is located inside the cabinet 10. In this embodiment, see [reference needed]. Figure 3-7 , Figure 3-4 The diagram shows a three-dimensional view of the air outlet 30 from different angles. Figure 5 A side view of the air inlet end of the air outlet 30 is shown. Figure 6-7The diagram shows a cross-sectional view of the air outlet 30. Exemplarily, the air outlet 30 is provided with two independent air outlet channels 31 along the Y-axis. It should be understood that in other embodiments, the number of air outlet channels 31 may be greater, or each air outlet channel 31 may be stacked along the Z-axis. Each air outlet channel 31 has an air inlet 311 and an air outlet 312 at both ends. Both air inlets 311 are supplied with air by the first cooling fan 21, and both air outlets 312 are connected to the first ventilation port 11. In this embodiment, the first cooling fan 21 is installed on the top of the cabinet 10, and the first vent 11 and the second vent 12 are also located at the upper end of the cabinet 10. In this embodiment, the air outlet 31 extends along the X-axis direction. However, it should be understood that the extension direction of the air outlet 31 can be adjusted according to the position of the first vent 11 and the first cooling fan 21. For example, when the first cooling fan 21 is located in the middle of the vertical direction of the cabinet 10, the extension direction of the air outlet 31 can be partly the X-axis direction and partly the Z-axis direction. This embodiment does not limit this.

[0045] The air outlet component 30 is composed of multiple sheet metal parts, see [link / reference]. Figure 5-7 In this embodiment, the air outlet duct 31 has a rectangular cross-section perpendicular to the X-axis. The minimum cross-sectional area of ​​the air outlet duct 31 is larger than that of the air inlet 311, and the minimum cross-sectional area of ​​the air outlet duct 31 is larger than that of the air outlet 312. It should be understood that the cross-sectional area of ​​the air outlet duct 31 can be adjusted by setting the length, width, and height of the air outlet duct 31. A first sound-absorbing layer 32 is fixedly attached to the channel wall of the air outlet duct 31. In this embodiment, each air outlet duct 31 has two first channel walls 313 opposite each other along the Z-axis and two second channel walls 314 opposite each other along the Y-axis. The first channel walls 313 and the second channel walls 314 are fixedly connected. In this embodiment, the first sound-absorbing layer 32 is fixedly attached to the first channel wall 313 of each air outlet duct 31. The fixing method can be adhesive or fixing with nails. However, it should be understood that the first sound-absorbing layer 32 can also be fixedly attached to the second channel wall 314. A baffle 33 is provided inside the air outlet duct 31 to change the air passage area of ​​the air outlet duct 31. The baffle 33 is inclined along the air outlet direction. It should be understood that the inclination of the baffle 33 along the air outlet direction includes not only the inclination of planar structures, but also the inclination of curved surfaces such as arcs. There are at least two baffles 33, and each baffle 33 is distributed at intervals along the extension direction of the air outlet duct 31 on the channel wall of the air outlet duct 31, and two adjacent baffles 33 protrude from two opposite channel walls of the air outlet duct 31. Figure 6-7The diagram shows the arrangement of three baffles 33. In each air outlet duct 31, two adjacent baffles 33 protrude from two first channel walls 313 and are fixed to two second channel walls 314. Two adjacent baffles 33 on the same channel wall are parallel to each other, and the extending directions of two adjacent baffles 33 on opposite channel walls intersect each other. See also Figure 3-4 and Figure 6 The air outlet duct 31 has a first air guide wall 315 near the air inlet 311. In this embodiment, the first air guide wall 315 is located on the first channel wall 313. Each baffle 33 has a first baffle 34 that is parallel to and opposite to the first air guide wall 315. See also Figure 4 and Figure 7 The channel wall of the air outlet 31 is provided with a second air guide wall 316 inclined along the air outlet direction near the air outlet 312. In this embodiment, the second air guide wall 316 is provided on the second channel wall 314 of each air outlet 31 away from the other air outlet 31 along the Y-axis direction.

[0046] The preferred structure of baffle 33 will be further described below, see [link to relevant documentation]. Figure 6-7 The baffle 33 includes a second sound-absorbing layer 331 and a connecting plate 332 fixedly connected to each other. The connecting plate 332 is fixedly connected to the channel wall of the air outlet channel 31. Both ends of the connecting plate 332 along the Y-axis direction are respectively bent to form connecting edges 333 perpendicular to the Y-axis direction. The baffle 33 can be installed in the air outlet channel 31 by fixing the connecting edges 333 to the second channel wall 314. In this embodiment, the second sound-absorbing layer 331 faces the air inlet 311, and the connecting plate 332 faces the air outlet 312.

[0047] See Figure 2 The first cover 40 is installed at the first vent 11 and has an air vent 41 opposite to the first vent 11 and communicating with the outside. The noise reduction component 50 is placed inside the first cover 40 and has several sound-absorbing channels 02 arranged along the Z-axis. In this embodiment, the sound-absorbing channels 02 and the waterproof channels 01 extend at an angle and are located on the extension line of at least one waterproof channel 01. The noise reduction component 50 and the first vent 11 are also spaced apart along the X-axis to form a flow-expanding cavity 03. The first filter 70 is installed between the noise reduction component 50 and the air vent 41. In this embodiment, the first filter 70 is a composite structure composed of a filter screen and filter cotton. The noise reduction component 50, the first cover 40 and the first filter 70 cooperate to form the first noise reduction structure.

[0048] See Figure 2 The second enclosure 60 is installed over the second ventilation opening 12 and has a windbreak wall 61 opposite to the second ventilation opening 12. A third sound-absorbing layer 62 is fixedly connected to the windbreak wall 61. It should be understood that, in addition to the windbreak wall 61, other parts of the second enclosure 60 may also be fixedly connected to the third sound-absorbing layer 62. Figure 2 In the middle, a third sound-absorbing layer 62 is also fixed to the top wall of the second cover 60, and the windproof wall 61 is provided with an exhaust port 611, and the exhaust port 611 and the second ventilation port 12 are offset from each other on the projection plane perpendicular to the X-axis direction. Figure 2 In this configuration, the exhaust vent 611 is located below the second ventilation opening 12. A second filter element 80 is installed at the exhaust vent 611; in this embodiment, the second filter element 80 is a filter cotton structure. The second cover 60 and the second filter element 80 work together to form a second noise reduction structure.

[0049] For example, the first sound-absorbing layer 32, the second sound-absorbing layer 331 and the third sound-absorbing layer 62 are made of fibrous sound-absorbing material or particulate sound-absorbing material.

[0050] When the noise reduction cabinet is working, the noise of the first cooling fan 21 can be attenuated by the air outlet 30 and the first noise reduction structure, the noise of the second cooling fan 22 can be attenuated by the second noise reduction structure, and the noise of the third cooling fan 23 can be attenuated by the first noise reduction structure.

[0051] In this embodiment, a baffle 33 is provided inside the air outlet duct 31 to change the air passage area of ​​the air outlet duct 31. When the noise of the first cooling fan 21 propagates in the air outlet duct 31, the change in the cross-sectional area of ​​the duct will cause the impedance mismatch of the noise sound wave to cause reflection, and cause the noise intensity to decrease, thus achieving a noise reduction effect. In addition, the setting of the baffle 33 will also extend the propagation path of the sound wave, which will also have a noise reduction effect. The baffle 33 is inclined along the air outlet direction. Compared with the baffle 33 being set perpendicular to the air outlet direction, it can have a better guiding effect on the airflow in the air outlet duct 31, thereby reducing wind resistance and facilitating air outlet. This avoids heat accumulation inside the noise reduction cabinet, thus ensuring the heat dissipation efficiency of the noise reduction cabinet. Therefore, the noise reduction cabinet of this application has a good noise reduction effect while ensuring heat dissipation efficiency.

[0052] In this embodiment, there are at least two baffles 33. Each baffle 33 is distributed at intervals on the channel wall of the air outlet channel 31 along the extension direction of the air outlet channel 31. The two adjacent baffles 33 protrude from the two opposite channel walls of the air outlet channel 31, which prolongs the propagation path of the sound wave and increases the number of noise reflections, thereby further increasing the noise reduction effect.

[0053] In this embodiment, two adjacent baffles 33 located on the same channel wall are parallel to each other, and the extension directions of two adjacent baffles 33 located on opposite channel walls intersect each other. Compared with the scheme where all baffles 33 are parallel to each other, this is more conducive to the airflow guidance, thereby further reducing wind resistance and facilitating the air outlet of the air outlet channel 31, thus ensuring the heat dissipation efficiency of the noise reduction cabinet.

[0054] In this embodiment, the minimum cross-sectional area of ​​the air outlet channel 31 is greater than that of the air inlet 311. On the one hand, when the air enters the air outlet channel 31 from the air inlet 311, the wind resistance is small, which is beneficial to the air delivery of the first cooling fan 21. On the other hand, it also causes the sound waves of the noise to be reflected due to the impedance mismatch caused by the change in the cross-sectional area of ​​the channel when the noise enters the air outlet channel 31 from the air inlet 311, which further causes the noise intensity to be attenuated and thus achieves a noise reduction effect.

[0055] In this embodiment, the air outlet duct 31 is provided with a first air guide wall 315 near the air inlet 311. Each baffle 33 has a first baffle 34 that is parallel to and opposite to the first air guide wall 315. This is more conducive to guiding the airflow into the air outlet duct 31 from the air inlet 311, thereby reducing wind resistance. In addition, it is also conducive to the reflection of noise on the first air guide wall 315 and the first baffle 34, as well as the reflection after passing through the first air guide wall 315 and the first baffle 34, thus further contributing to the attenuation of noise.

[0056] In this embodiment, the minimum cross-sectional area of ​​the air outlet 31 is greater than that of the air outlet 312. Combined with the fact that the minimum cross-sectional area of ​​the air outlet 31 is greater than that of the air inlet 311, the air outlet 31 is an expanded channel with better noise reduction effect. The channel wall of the air outlet 31 is provided with a second air guide wall 316 inclined along the air outlet direction near the air outlet 312, which is more conducive to guiding the airflow in the air outlet 31 to the air outlet 312 and reducing wind resistance.

[0057] In this embodiment, a first sound-absorbing layer 32 is fixedly attached to the channel wall of the air outlet channel 31, so that the channel wall of the air outlet channel 31 can also absorb noise, thereby further increasing the noise attenuation effect.

[0058] In this embodiment, the baffle 33 includes a second sound-absorbing layer 331 and a connecting plate 332 fixedly connected to each other. The connecting plate 332 is fixedly connected to the channel wall of the air outlet duct 31. Since the connecting plate 332 is easier to process and has better rigidity, it is more conducive to the installation of the baffle 33 by fixing the connecting plate 332 to the channel wall of the air outlet duct 31. The second sound-absorbing layer 331 facing the air inlet 311 is conducive to the absorption of noise, while the connecting plate 332 facing the air outlet 312 is conducive to the guidance of airflow, thereby reducing wind resistance and increasing the noise attenuation effect.

[0059] In this embodiment, the first cover 40 and the noise reduction component 50 can further attenuate the noise at the air outlet 312 of the air outlet channel 31. Simultaneously, the first cover 40 and the noise reduction component 50 can prevent impurities such as wind, sand, rain, and snow from entering the noise reduction cabinet, improving its protective properties. The noise reduction component 50 is placed inside the first cover 40 and forms a flow-expanding cavity 03 along the X-axis between it and the waterproof louver 13. The flow-expanding cavity 03 can buffer the airflow discharged from the first vent 11. Furthermore, when noise enters the flow-expanding cavity 03 from the waterproof channel 01, the channel area changes abruptly, causing an impedance mismatch in the sound waves. This can easily lead to some sound waves propagating in the reverse direction towards the waterproof louver 13, thereby reducing the energy of the sound waves and attenuating the noise. Each silencing channel 02 is located on the extension line of at least one waterproof channel 01; that is, each silencing channel 02 is located on the extension line of at least one waterproof channel 01. The linear path between the two channels, compared to the scheme where the silencing channels 02 and the waterproof channels 01 are staggered, makes full use of the structure of the waterproof louvers 13 to design the noise reduction component 50. This allows the noise transmitted from the waterproof louvers 13 to directly enter each silencing channel 02 and be reflected by the noise reduction component 50, thus allowing the noise to be reflected multiple times, increasing the energy loss of the sound waves and attenuating the noise. On the other hand, it also reduces the wind resistance between the silencing channels 02 and the waterproof louvers 13, thereby reducing the wind resistance between the air vent 41 and the first ventilation opening 11, which is beneficial for airflow.

[0060] In this embodiment, the second enclosure 60 is installed over the second ventilation opening 12 and has a windbreak wall 61 opposite to the second ventilation opening 12. A third sound-absorbing layer is fixed to the windbreak wall 61. The windbreak wall 61 has an exhaust port 611, and the exhaust port 611 and the second ventilation opening 12 are offset from each other on the projection plane perpendicular to the X-axis. This allows the noise emitted from the second ventilation opening 12 to be reflected by the windbreak wall 61 and absorbed by the third sound-absorbing layer 62 after being discharged through the exhaust port 611, resulting in excellent noise attenuation. Furthermore, since the exhaust port 611 and the second ventilation opening 12 are offset from each other on the projection plane perpendicular to the X-axis, the propagation path of the sound waves is extended, further increasing the noise attenuation effect. In addition, the second enclosure 60 also improves the protection of the second ventilation opening. As a result, the noise of the first cooling fan 21, the second cooling fan 22, and the third cooling fan 23 inside the noise reduction cabinet is effectively attenuated, and the noise reduction cabinet still maintains a high air outlet efficiency, thus having a high heat dissipation efficiency.

[0061] 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 cabinet, comprising an air outlet duct (31), wherein an air inlet (311) and an air outlet (312) are respectively provided at both ends of the air outlet duct (31), and the air inlet (311) is supplied with air by a first cooling fan (21), characterized in that, The air outlet channel (31) is provided with a baffle (33) to change the air passage area of ​​the air outlet channel (31), and the baffle (33) is inclined along the air outlet direction.

2. The noise reduction cabinet as described in claim 1, characterized in that, The minimum cross-sectional area of ​​the air outlet channel (31) is greater than the cross-sectional area of ​​the air inlet (311).

3. A noise reduction cabinet as described in claim 2, characterized in that, The number of baffles (33) is at least two. Each baffle (33) is distributed at intervals on the channel wall of the air outlet channel (31) along the extension direction of the air outlet channel (31), and two adjacent baffles (33) protrude from the two opposite channel walls of the air outlet channel (31).

4. A noise reduction cabinet as described in claim 3, characterized in that, Two adjacent baffles (33) located on the same channel wall are parallel to each other, and the extension directions of two adjacent baffles (33) located on opposite channel walls intersect each other.

5. A noise reduction cabinet as described in claim 4, characterized in that, The air outlet channel (31) has a first air guide wall (315) near the air inlet (311), and each baffle (33) has a first baffle (34) that is parallel to and opposite to the first air guide wall (315).

6. A noise reduction cabinet as described in claim 4, characterized in that, The minimum cross-sectional area of ​​the air outlet channel (31) is greater than the cross-sectional area of ​​the air outlet (312), and the channel wall of the air outlet channel (31) is provided with a second air guide wall (316) inclined along the air outlet direction near the air outlet (312).

7. A noise reduction cabinet as described in claim 1, characterized in that, A first sound-absorbing layer (32) is fixed to the wall of the air outlet duct (31).

8. A noise reduction cabinet as described in claim 7, characterized in that, The baffle (33) includes a second sound-absorbing layer (331) and a connecting plate (332) fixedly connected to each other. The connecting plate (332) is fixedly connected to the channel wall of the air outlet channel (31). The second sound-absorbing layer (331) faces the air inlet (311), and the connecting plate (332) faces the air outlet (312).

9. A noise reduction cabinet as described in any one of claims 1-8, characterized in that, It also includes a first enclosure (40) and a noise reduction component (50); the noise reduction cabinet is also provided with a first ventilation opening (11) communicating with the outside along the X-axis direction, the first enclosure (40) is installed at the ventilation opening and is provided with an air passage (41) opposite to the first ventilation opening (11) and communicating with the outside, the noise reduction component (50) is placed in the enclosure and is provided with several sound-absorbing channels (02) arranged along the Z-axis direction; the air outlet channel (31) is located in the noise reduction cabinet and its air outlet (312) is connected to the first ventilation opening (11).

10. A noise reduction cabinet as described in claim 9, characterized in that, It also includes a second enclosure (60); the noise reduction cabinet is also provided with a second ventilation opening (12) that communicates with the outside and is opened along the X-axis direction, the second ventilation opening (12) is supplied with air by a second cooling fan (22); the second enclosure (60) covers the second ventilation opening (12) and is provided with a windproof wall (61) opposite to the second ventilation opening (12), a third sound-absorbing layer (62) is fixed on the windproof wall (61), the windproof wall (61) is provided with an exhaust port (611) and the exhaust port (611) and the second ventilation opening (12) are offset from each other on the projection plane perpendicular to the X-axis direction.

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