Noise reduction device for power distribution room

Abstract

The invention relates to the technical field of power distribution equipment, in particular to a noise reduction device for a power distribution room. According to the technical scheme, the noise reduction device for the power distribution room comprises the power distribution room, a power distribution cabinet, a sound insulation layer, an air inlet pipe and an air outlet pipe. The air outlet pipe is divided into the first section, the second section and the third section, one end of the first section communicates with the air outlet, the other end of the first section communicates with the second section, and one end of the third section communicates with the second section. Air can flow to the first section from the interior of the containing cavity, then flow to the second section from the first section and finally flow to the third section. In the direction from the first section to the third section, the sectional area of the second section is in an increasing trend, and the accommodating volume of the third section is larger than that of the first section, so that wind can be spread from the first section with the small accommodating volume to the third section with the large accommodating volume, and the energy of sound waves can be dispersed to the third section with a larger area; as the sound needs to cover a larger area in a large space, the sound is heard to be smaller, and the noise reduction function is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution equipment, and in particular to a noise reduction device for a power distribution room. Background Art

[0002] With the development of power distribution equipment technology, power distribution rooms are common equipment in life. Power distribution rooms will generate a lot of noise during use, affecting the lives of people around them. In addition, they will also generate a lot of heat during operation, which requires ventilation and heat dissipation of the power distribution room. Therefore, how to quickly ventilate and dissipate heat in the power distribution room while reducing the impact of noise on people is a technical problem that needs to be solved in power distribution equipment technology. Summary of the invention

[0003] Based on this, the present application provides a noise reduction device for a power distribution room, which can quickly ventilate and dissipate heat in the power distribution room while reducing the impact of noise on people.

[0004] In the first aspect, an embodiment of the present application provides a noise reduction device for a power distribution room, comprising a power distribution room, a power distribution cabinet, a sound insulation layer, an air inlet duct and an air outlet duct. The power distribution room has a accommodating cavity, and an air inlet and an air outlet are respectively provided on the inner walls on both sides of the accommodating cavity. The power distribution cabinet is arranged on the bottom surface of the accommodating cavity. The sound insulation layer is fixedly arranged on at least one inner wall of the accommodating cavity. The air inlet duct is connected to the accommodating cavity by means of the air inlet. The air outlet duct is connected to the accommodating cavity by means of the air outlet, and the air outlet duct includes a first section, a second section and a third section, one end of the first section is connected to the air outlet, and the other end is connected to the second section, and one end of the third section is connected to the second section; along the direction from the first section to the third section, the cross-sectional area of ​​the second section tends to increase. Among them, the accommodating volume of the third section is larger than the accommodating volume of the first section.

[0005] In one embodiment, the cross-sectional area of ​​the second section gradually increases along the direction from the first section to the third section.

[0006] In one embodiment, the cross-section of the second section is a trapezoid, the ratio between the upper base of the trapezoid and the lower base of the trapezoid is 1:2, the upper base of the trapezoid is connected to the first section, and the lower base of the trapezoid is connected to the third section.

[0007] In one of the embodiments, the noise reduction device for the power distribution room further includes a sound absorbing layer, and the sound absorbing layer is installed in the accommodating cavity.

[0008] In one of the embodiments, the noise reduction device for the power distribution room further includes an installation portion, and the installation portion is used to install the sound absorbing layer into the accommodating cavity.

[0009] In one embodiment, the mounting portion includes a mounting section on the inner wall of the accommodating cavity where no sound insulation layer is attached and a first threaded member; the sound absorbing layer is riveted to the mounting section by means of the first threaded member; and / or

[0010] The mounting portion includes a mounting block and a second threaded member, the mounting block is disposed between the sound insulation layer and the sound absorption layer, two opposite side surfaces of the mounting block are respectively in contact with the sound insulation layer and the sound absorption layer, and the sound absorption layer and the mounting block are connected by means of the second threaded member; and / or

[0011] The mounting portion comprises adhesive, and the side surface of the sound absorbing layer and the sound insulating layer which is away from the inner wall of the accommodating cavity is adhered by means of the adhesive.

[0012] In one embodiment, the sound absorbing layer comprises a plurality of sub-sound absorbing parts, and two adjacent sub-sound absorbing parts are connected by a slot structure; and / or

[0013] The sound-absorbing layer adopts a honeycomb porous structure.

[0014] In one of the embodiments, the noise reduction device for the power distribution room further includes a sound absorbing column, which is arranged in the third section.

[0015] In one embodiment, the sound absorbing column includes a plurality of sub-sound absorbing columns.

[0016] In one of the embodiments, the noise reduction device for the power distribution room further includes a fan, and the fan is disposed in the first section or the second section.

[0017] In one of the embodiments, the noise reduction device for the power distribution room further includes a dustproof net, which is arranged at one end of the air inlet duct away from the air inlet.

[0018] In the above-mentioned noise reduction device for the power distribution room, the noise reduction device for the power distribution room includes a power distribution room, a power distribution cabinet, a sound insulation layer, an air inlet pipe and an air outlet pipe. Since the power distribution cabinet is arranged in the accommodating chamber of the power distribution room, the power distribution cabinet will generate heat when working, so that an air inlet and an air outlet are respectively opened on the inner walls on both sides of the accommodating chamber of the power distribution room. Since the air inlet pipe is connected with the accommodating chamber by means of the air inlet, and the air outlet pipe is connected with the accommodating chamber by means of the air outlet, the accommodating chamber can be ventilated and heat can be dissipated. By fixing the sound insulation layer on at least one inner wall of the accommodating chamber, the sound insulation capacity of the power distribution room is improved, and the internal noise of the power distribution room is effectively isolated from being transmitted to the outside. By setting the air outlet pipe into the first section, the second section and the third section, one end of the first section is connected with the air outlet, the other end is connected with the second section, and one end of the third section is connected with the second section. In this way, the wind can flow from the accommodating chamber to the first section, then flow from the first section to the second section and finally flow to the third section. And along the direction from the first section to the third section, the cross-sectional area of ​​the second section tends to increase, and the accommodation volume of the third section is larger than that of the first section. In this way, the wind can propagate from the first section with a small accommodation volume to the third section with a large accommodation volume, and the energy of the sound wave will be dispersed to a larger area of ​​the third section. Since the sound needs to cover a larger area in a large space, the energy density is reduced, making the sound sound smaller, thereby achieving the noise reduction function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a noise reduction device for a power distribution room in some embodiments of the present application.

[0020] Figure 2 for Figure 1 A local enlarged view of point A in the figure.

[0021] Figure 3 for Figure 1 Schematic diagram of the structure of the sound-absorbing layer.

[0022] The reference numerals in the specific implementation manner are as follows:

[0023] A noise reduction device 100 for a power distribution room, a power distribution room 1, a accommodating chamber R, a power distribution cabinet 2, a sound insulation layer 3, an air inlet duct 4, an air outlet duct 5, an air inlet K1, an air outlet K2, a first section 51, a second section 52, a third section 53, a sound absorbing layer 6, a sub-sound absorbing portion 61, a mounting portion 7, a mounting block 7a1, a second threaded member 7a2, a sound absorbing column 8, a sub-sound absorbing column 81, a fan 9, and a dustproof net 10. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is the orientation or position relationship based on the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0030] With the development of power distribution equipment technology, power distribution rooms are common equipment in life. Power distribution rooms will generate a lot of noise during use, affecting the lives of people around them. In addition, they will also generate a lot of heat during operation, which requires ventilation and heat dissipation of the power distribution room. Therefore, how to quickly ventilate and dissipate heat in the power distribution room while reducing the impact of noise on people is a technical problem that needs to be solved in power distribution equipment technology.

[0031] Based on this, in order to reduce the impact of noise in a power distribution room on people's lives, an embodiment of the present application provides a noise reduction device for a power distribution room.

[0032] See also Figure 1 , Figure 1A schematic diagram of the structure of the noise reduction device for a power distribution room in some embodiments of the present application is shown. The noise reduction device 100 for a power distribution room includes a power distribution room 1, a power distribution cabinet 2, a sound insulation layer 3, an air inlet duct 4 and an air outlet duct 5. The power distribution room 1 has a accommodating chamber R, which allows the power distribution cabinet 2 to be arranged on the bottom surface of the accommodating chamber R. An air inlet K1 and an air outlet K2 are respectively provided on the inner walls on both sides of the accommodating chamber R. The air inlet duct 4 and the accommodating chamber R are connected by means of the air inlet K1, and the air outlet duct 5 and the accommodating chamber R are connected by means of the air outlet K2. In this way, the wind can enter the accommodating chamber R from the air inlet duct 4 and then be discharged through the air outlet duct 5, so that the interior of the accommodating chamber R in the power distribution room 1 is ventilated and heat is dissipated.

[0033] The "accommodation cavity R" refers to a space specially designed to accommodate, protect or store something. Here, the accommodation cavity R in the power distribution room 1 is a space for accommodating the power distribution cabinet 2 and various power distribution equipment. The shape of the accommodation cavity R can be a square, a cylinder, etc.

[0034] The above-mentioned air outlet pipe 5 includes a first section 51, a second section 52 and a third section 53. One end of the first section 51 is connected to the air outlet K2, and the other end is connected to the second section 52. The wind can flow from the accommodation chamber R to the first section 51, and then flow from the first section 51 to the second section 52. Then, by connecting one end of the third section 53 to the second section 52, the wind can flow from the second section 52 to the third section 53. And in the direction from the first section 51 to the third section 53, the cross-sectional area of ​​the second section 52 tends to increase, and the accommodation volume of the third section 53 is greater than the accommodation volume of the first section 51. In this way, the wind can flow from the accommodation chamber R to the first section 51, and then flow from the first section 51 to the second section 52 and finally to the third section 53. In addition, along the direction from the first section 51 to the third section 53, the cross-sectional area of ​​the second section 52 tends to increase, and the accommodation volume of the third section 53 is larger than the accommodation volume of the first section 51. In this way, the wind can propagate from the first section 51 with a small accommodation volume to the third section 53 with a large accommodation volume, and the energy of the sound wave will be dispersed to a larger area of ​​the third section 53. Since the sound needs to cover a larger area in a large space, the energy density is reduced, so that the sound sounds smaller, thereby achieving the noise reduction function.

[0035] It should be noted that the "increasing trend" may include staged increases, such as increasing first, then remaining unchanged, and then increasing, etc.; it may also include continuous increases, such as a consistent increase speed or increasing quickly first and then increasing slowly, etc. Taking the increasing trend of increasing first, then remaining unchanged, and then increasing as an example, the increasing trend is divided into three stages: the "increasing first" stage, the "no changing" stage, and the "increasing later" stage.

[0036] In addition, the sound insulation layer 3 is fixed to at least one inner wall of the accommodating cavity R, so as to further reduce the risk of the noise in the accommodating cavity R spreading to the outside of the power distribution room 1 .

[0037] Here, "at least one" means that it can be arranged on one, two or even all inner walls of the accommodation cavity R, but at least one inner wall is required. The size and number of the sound insulation layer 3 can be reasonably designed according to actual factors such as the area and shape of the inner wall of the accommodation cavity R.

[0038] In some embodiments of the present application, continue to refer to Figure 1 , along the direction from the first section 51 to the third section 53, the cross-sectional area of ​​the second section 52 gradually increases.

[0039] The cross-sectional area of ​​the second section 52 gradually increases, which is the case where the cross-sectional area is constantly increasing and the speed of the cross-sectional increase is consistent. Setting the cross-sectional area to be constantly increasing allows the wind to spread to a larger space when flowing, and the energy of the sound wave will be dispersed to a larger area. Since the sound needs to cover a larger area in a large space, the energy density is reduced, so that the sound sounds smaller, achieving a noise reduction function. Setting the speed of the cross-sectional increase to be consistent makes the processing of the second section 52 more convenient, and the flow of the wind is more uniform and fast.

[0040] In some embodiments of the present application, continue to refer to Figure 1 The cross section of the second section 52 is a trapezoid, the ratio between the upper base of the trapezoid and the lower base of the trapezoid is 1:2, the upper base of the trapezoid is connected to the first section 51, and the lower base of the trapezoid is connected to the third section 53. In this way, the design of the trapezoidal cross section helps the wind to smoothly transition when passing through different cross sections, reduce resistance, and improve the efficiency of wind flow. And the ratio between the upper base of the designed trapezoid and the lower base of the trapezoid is designed to be 1:2, which can optimize the use of materials, facilitate the processing and production of the second section 52, and also make the second section 52 have a certain aesthetics.

[0041] It is understandable that in some other embodiments, the cross section of the second section 52 may be a curved cross section including a curve. The cross section of the second section 52 may also be a trapezoidal cross section with different ratios between the upper base and the lower base, for example, the ratio of the upper base to the lower base may be designed to be 1:3, 1:4 or 2:3, etc., but the upper base must be smaller than the lower base, that is, the ratio of the upper base to the lower base must be less than 1.

[0042] In some embodiments of the present application, see Figure 1 The power distribution room noise reduction device 100 further includes a sound absorbing layer 6, and the sound absorbing layer 6 is installed in the accommodating cavity R. The sound absorbing layer 6 is provided to absorb the noise in the power distribution room 1, thereby further reducing the risk of the noise in the power distribution room 1 being transmitted outward.

[0043] In some embodiments of the present application, reference may be made to Figure 1 , and combined with reference Figure 2 , Figure 2 Shows Figure 1The noise reduction device 100 for the power distribution room further includes a mounting portion 7 for mounting the sound absorbing layer 6 into the accommodation cavity R. The arrangement of the mounting portion 7 enables the sound absorbing layer 6 to be mounted into the accommodation cavity R.

[0044] In some embodiments of the present application, continue to refer to Figure 1 and Figure 2 The mounting portion 7 includes a mounting section on which the sound insulation layer 3 is not attached to the inner wall of the accommodating chamber R and a first threaded component, and the sound absorbing layer 6 is riveted to the mounting section by means of the first threaded component; and / or, the mounting portion 7 includes a mounting block 7a1 and a second threaded component 7a2, the mounting block 7a1 is arranged between the sound insulation layer 3 and the sound absorbing layer 6, and the two opposite side surfaces of the mounting block 7a1 are respectively in contact with the sound insulation layer 3 and the sound absorbing layer 6, and the sound absorbing layer 6 is connected to the mounting block 7a1 by means of the second threaded component 7a2; and / or, the mounting portion 7 includes adhesive, and the side of the sound absorbing layer 6 and the sound insulation layer 3 that is away from the inner wall of the accommodating chamber R is adhered by means of adhesive.

[0045] The sound absorbing layer 6 is installed on the inner wall of the accommodating cavity R through the installation part 7. The installation part 7 may include an installation section on the inner wall of the accommodating cavity R where the sound insulation layer 3 is not attached and a first threaded member, and the sound absorbing layer 6 is directly riveted to the accommodating cavity R of the power distribution room 1 through the first threaded member, so that the sound absorbing layer 6 is installed in the power distribution room 1. In this way, when setting the sound insulation layer 3, it is necessary to first reserve the installation section of the inner wall of the accommodating cavity R, and the installation section refers to the part that is not connected and matched with other parts, and then directly set the sound absorbing layer 6 on the inner wall by riveting, which is convenient for installing the sound absorbing layer 6. During the installation process, it is not necessary to cooperate with the sound insulation layer 3, and the installation and use of the sound insulation layer 3 will not be damaged.

[0046] The mounting portion 7 may also be provided with a mounting block 7a1 and a second screw member 7a2, and the two opposite sides of the mounting block 7a1 are respectively abutted against the sound insulation layer 3 and the sound absorption layer 6, and the sound absorption layer 6 and the mounting block 7a1 are fixedly connected together by the second screw member 7a2, and the friction between the mounting block 7a1 and the sound insulation layer 3 and the friction between the mounting block 7a1 and the sound absorption layer 6 make the mounting block 7a1 stably located between the sound absorption layer 6 and the sound insulation layer 3. In this way, the sound absorption component is installed in the power distribution room 1 without damaging the sound insulation layer 3, and the sound insulation layer 3 can be maximally covered on the inner wall of the accommodating cavity R, so as to maximize the noise reduction effect.

[0047] The mounting portion 7 may also be configured as adhesive, and the side of the sound absorbing layer 6 and the sound insulation layer 3 that is away from the inner wall of the accommodating cavity R is bonded together by the adhesive, so that the sound absorbing layer 6 is installed in the power distribution room 1. With this design, the cost of the adhesive is low and the operation is convenient and fast by pasting.

[0048] In some embodiments of the present application, continue to refer to Figure 1 , and combined with reference Figure 3 , Figure 3 Shows Figure 1 The sound absorbing layer 6 comprises a plurality of sub-sound absorbing parts 61, and two adjacent sub-sound absorbing parts 61 are connected by a slot structure; and / or the sound absorbing layer 6 adopts a honeycomb porous structure.

[0049] Here, "plurality" means at least two, and can be three, four, five, etc. In practical applications, the number of sub-sound absorbing parts 61 can be arranged to be three, and three are sufficient to provide the effect of absorbing the remaining noise. If the number of sub-sound absorbing parts 61 is less than three, it may not provide sufficient noise reduction effect. If the number of sub-sound absorbing parts 61 is greater than three, it may result in waste of material of the sound absorbing column 8 and make the weight of the third section 53 too large, which may cause stress concentration and damage to the distribution room 1.

[0050] By configuring the sound absorbing layer 6 to be composed of a plurality of sub-sound absorbing parts 61 connected in a plug-in manner, when the sound absorbing layer 6 needs to be repaired or replaced, the part that needs to be repaired can be quickly replaced without affecting the use of other parts. The slot structure refers to configuring one of two adjacent sub-sound absorbing parts 61 to have a protrusion and the other to have a groove, and the two can be spliced ​​and installed together.

[0051] The sound absorbing layer 6 is set to a honeycomb porous structure. The honeycomb structure has a large number of pores, which can capture and absorb sound waves, reduce the reflection and propagation of sound, and thus improve the sound absorption efficiency. The honeycomb structure is light in weight, and this structure does not increase too much weight while ensuring the sound absorption effect. The honeycomb structure has high compressive strength and rigidity, which increases the durability of the sound absorbing layer 6, and the honeycomb porous structure allows air circulation, reducing the risk of mold and bacteria growth.

[0052] In some embodiments of the present application, reference may be made to Figure 1 The noise reduction device 100 for the power distribution room further includes a sound absorbing column 8 , which is disposed in the third section 53 .

[0053] In order to further improve the noise reduction effect of the distribution room 1 device, the distribution room noise reduction device 100 is provided with a sound-absorbing column 8, which is arranged in the third section 53 of the air outlet duct 5 with a larger accommodating space, so as to absorb the noise on the final path of the noise transmission to the external space of the distribution room 1 device, thereby further reducing the risk of noise propagation outward.

[0054] In some embodiments of the present application, continue to refer to Figure 1 The sound-absorbing column 8 includes a plurality of sub-sound-absorbing columns 81, and the plurality of sub-sound-absorbing columns 81 can further increase the sound-absorbing effect, wherein "plurality" means at least two, which can be two, three, four, etc. The installation position and spacing distance of the sub-sound-absorbing columns 81 are not limited here, and can be reasonably arranged according to the space of the third section 53.

[0055] In some embodiments of the present application, continue to refer to Figure 1 The power distribution room noise reduction device 100 further includes a fan 9 disposed in the first section 51 or the second section 52. By disposing the fan 9 in the exhaust duct, wind can be quickly blown from the accommodating chamber R to the exhaust duct, thereby allowing the accommodating chamber R to quickly dissipate heat.

[0056] In some embodiments of the present application, continue to refer to Figure 1 The noise reduction device 100 for the power distribution room further includes a dustproof net 10, which is arranged at one end of the air inlet pipe 4 away from the air inlet K1.

[0057] By providing a dustproof net 10, dust and other particles can be prevented from entering the room or the interior of the equipment. By setting it at the end of the air inlet pipe 4 away from the air inlet K1, the wind can enter the receiving chamber R of the power distribution room 1 after being filtered, thereby keeping the air clean. By reducing the risk of dust directly entering the interior of the air inlet pipe 4, the wear of the dust on the inner wall of the pipe can be reduced, and the service life of the air inlet pipe 4 can be extended. In addition, the dustproof net 10 is set at the end of the air inlet pipe 4 away from the air inlet K1, which is usually easier to approach and inspect, and is convenient for cleaning and maintenance.

[0058] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A noise reduction device for a power distribution room, It is characterized in that include: The power distribution room has a receiving cavity, and an air inlet and an air outlet are respectively provided on the inner walls on both sides of the receiving cavity; A power distribution cabinet, arranged on the bottom surface of the accommodating cavity; A sound insulation layer, fixedly disposed on at least one inner wall of the accommodating cavity; An air inlet pipe, the air inlet pipe is connected to the accommodating chamber via the air inlet; an air outlet pipe, the air outlet pipe is connected to the accommodating cavity via the air outlet, the air outlet pipe comprises a first section, a second section and a third section, one end of the first section is connected to the air outlet, the other end is connected to the second section, and one end of the third section is connected to the second section; along the direction from the first section to the third section, the cross-sectional area of ​​the second section tends to increase; Wherein, the accommodation volume of the third section is greater than the accommodation volume of the first section.

2. The noise reduction device for a power distribution room according to claim 1, It is characterized in that Along the direction from the first section to the third section, the cross-sectional area of ​​the second section gradually increases.

3. The noise reduction device for a power distribution room according to claim 1, It is characterized in that The cross-section of the second section is a trapezoid, the ratio between the upper base of the trapezoid and the lower base of the trapezoid is 1:2, the upper base of the trapezoid is connected to the first section, and the lower base of the trapezoid is connected to the third section.

4. The noise reduction device for a power distribution room according to claim 1, It is characterized in that The noise reduction device for the power distribution room also includes a sound absorbing layer, which is installed in the accommodating cavity.

5. The noise reduction device for a power distribution room according to claim 4, It is characterized in that The noise reduction device for the power distribution room further includes an installation portion, which is used to install the sound absorbing layer into the accommodating cavity.

6. The noise reduction device for a power distribution room according to claim 5, It is characterized in that The mounting portion comprises a mounting section on the inner wall of the accommodating cavity where the sound insulation layer is not attached and a first threaded member; the sound absorbing layer is riveted to the mounting section by means of the first threaded member; and / or The mounting portion comprises a mounting block and a second threaded member, the mounting block is disposed between the sound insulation layer and the sound absorption layer, two opposite side surfaces of the mounting block are respectively in contact with the sound insulation layer and the sound absorption layer, and the sound absorption layer and the mounting block are connected by means of the second threaded member; and / or The mounting portion includes adhesive, and the side surfaces of the sound-absorbing layer and the sound-insulating layer that are away from the inner wall of the accommodating cavity are adhered to each other by means of the adhesive.

7. The noise reduction device for a power distribution room according to claim 4, It is characterized in that The sound absorbing layer comprises a plurality of sub-sound absorbing parts, and two adjacent sub-sound absorbing parts are connected by a slot structure; and / or The sound absorbing layer adopts a honeycomb porous structure.

8. The noise reduction device for a power distribution room according to any one of claims 1 to 6, It is characterized in that The noise reduction device for the power distribution room also includes a sound absorbing column, which is arranged in the third section.

9. The noise reduction device for a power distribution room according to claim 8, It is characterized in that The sound absorbing column comprises a plurality of sub-sound absorbing columns.

10. The noise reduction device for a power distribution room according to any one of claims 1 to 6, It is characterized in that The power distribution room noise reduction device further comprises a fan, wherein the fan is arranged in the first section or the second section, and / or The noise reduction device for the power distribution room further comprises a dustproof net, which is arranged at one end of the air inlet pipe away from the air inlet.

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