A noise-absorbing duct device and a charging pile

Abstract

This invention discloses a noise-absorbing duct device and a charging pile. The noise-absorbing duct device is provided with a noise-absorbing duct and a micro-perforated cavity. Both ends of the noise-absorbing duct are open, with one end connected to the outside air and the other end connected to the air inlet or outlet of the device to be noise-reduced. The micro-perforated cavity is located in the gas flow path of the noise-absorbing duct and is connected to the noise-absorbing duct through a connecting hole in the micro-perforated cavity. In use, the noise-absorbing duct device is installed on the device to be noise-reduced, allowing the gas generated by the device to enter the noise-absorbing duct for noise reduction. Because the gas flow path of the noise-absorbing duct is connected to the micro-perforated cavity, the gas can enter the micro-perforated cavity for further noise reduction, thus reducing the noise of the device.

Description

Technical Field

[0001] This invention relates to the field of charging pile technology, and in particular to a noise reduction duct device and a charging pile. Background Technology

[0002] Charging piles are commonly used charging devices for new energy vehicles. To meet the heat dissipation requirements of charging pile operation, axial flow fans are used to force-cool the charging modules inside the charging pile. The axial flow fan is installed inside the charging pile, and the side door panel of the charging pile has grille holes. Under the action of the axial flow fan, external air enters through the grille holes of the side door panel. The operation of the axial flow fan generates noise, which is radiated outward through the grille holes of the side door panel.

[0003] With the continuous development of new energy vehicles, the number of noise reduction devices, such as charging piles used to charge new energy vehicles, is also increasing. They often appear near our homes and have an impact on nearby residents.

[0004] In summary, how to reduce the noise during the operation of the noise reduction device is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the first objective of the present invention is to provide a noise reduction duct device to reduce the noise of the device to be noise-reduced.

[0006] The second objective of this invention is to provide a charging station.

[0007] To achieve the first objective mentioned above, the present invention provides the following solution:

[0008] A noise reduction duct device is used for noise reduction of a device to be noise-reduced. The noise reduction duct device is provided with a noise reduction duct and a micro-perforated cavity.

[0009] The sound-absorbing duct is open at both ends, with one end used to connect to the outside air and the other end used to connect to the air inlet or outlet of the noise reduction device.

[0010] The micro-perforated cavity is disposed on the gas flow path of the silencing duct and is connected to the silencing duct through a connecting hole opened on the micro-perforated cavity.

[0011] In one specific implementation, the number of micro-perforated cavities is at least one, and at least one of the micro-perforated cavities is located within the silencing duct to divide the silencing duct into at least two sections with different cross-sections.

[0012] In another specific embodiment, the silencing duct device includes a clamping plate assembly and side plates;

[0013] The clamping plate assembly includes at least two clamping plates, and the adjacent clamping plates are spaced apart by a preset distance. The side plate blocks and fixes both sides of the clamping plate assembly to form at least one sound-absorbing duct with the clamping plates.

[0014] In another specific implementation, at least one of the adjacent clamps is provided with a micro-perforated cavity on the surface facing the other, so as to divide the sound-absorbing duct into at least two sections with different cross-sections;

[0015] When the number of micro-perforated cavities is greater than or equal to 2, the micro-perforated cavities are spaced apart along the gas flow direction in the silencing duct.

[0016] In another specific implementation, at least one micro-perforated cavity is alternately spaced on the face of each adjacent clamping plate facing the other.

[0017] A first air duct is formed between adjacent micro-perforated cavities to form the silencing air duct, and a second air duct is formed between the micro-perforated cavity and the facing clamp plate to form the silencing air duct. The first air duct and the second air duct are connected, and the cross-section of the first air duct is different from that of the second air duct to form an expansion cavity air duct.

[0018] The connecting hole is formed on the side wall of the micro-perforated cavity surrounding the first air duct, or on the side wall of the micro-perforated cavity surrounding the second air duct.

[0019] In another specific embodiment, the micro-perforated cavity is adjustablely mounted on the clamp along the direction from the inlet to the outlet of the silencing duct.

[0020] In another specific implementation, one of the micro-perforated cavity and the clamping plate is provided with a slide rail, and the other is provided with a slide groove that slides and engages with the slide rail.

[0021] or

[0022] At least one of the micro-perforated cavity and the clamping plate has an elongated hole or a plurality of spaced connecting holes, and is connected to the other in an adjustable position by fasteners.

[0023] In another specific embodiment, the clamp is adjustablely connected to the side plate along a direction close to or away from the adjacent clamp.

[0024] In another specific implementation, one of the clamping plate and the side plate is provided with a guide rail, and the other is provided with a guide groove that is slidably connected to the guide rail;

[0025] or

[0026] At least one of the clamping plate and the side plate has an elongated hole or a plurality of connecting holes arranged at intervals to adjust the relative position of the clamping plate and the side plate.

[0027] In another specific implementation, the number of connecting holes opened on the micro-perforated cavity is multiple;

[0028] The silencing duct device also includes a plug that can be detachably sealed to the connecting hole.

[0029] In another specific implementation, the number of plugs is at least two, and adjacent plugs are connected by a connecting strip.

[0030] In another specific embodiment, the silencing duct device further includes sound-absorbing material layers respectively laid on the inner wall of the silencing duct and the inner wall of the micro-perforated cavity.

[0031] In another specific implementation, the two ends of the silencing duct have a preset height difference;

[0032] When the silencing duct device is installed at the air inlet of the noise reduction device, the inlet of the silencing duct is lower than the outlet of the silencing duct;

[0033] When the silencing duct is installed at the air outlet of the noise reduction device, the outlet of the silencing duct is lower than the inlet of the silencing duct.

[0034] In another specific implementation, the micro-perforated cavity is open at both ends and sealed by the side plate;

[0035] and / or

[0036] The clamping plate is provided with a first flange that connects to the side plate;

[0037] and / or

[0038] The side plate is provided with a second flange that is connected to the noise reduction device.

[0039] The various embodiments of the present invention can be combined arbitrarily as needed, and the resulting embodiments are also within the scope of the present invention and are part of the specific implementation of the present invention.

[0040] The noise reduction duct device provided by this invention, taking a charging pile as an example, is used by installing the noise reduction duct device on the charging pile so that the noise-reducing gas generated by the charging pile can enter the noise reduction duct for noise reduction. Since the gas flow path of the noise reduction duct is connected to a micro-perforated cavity, the gas can enter the micro-perforated cavity for further noise reduction, thereby reducing the noise of the charging pile.

[0041] To achieve the second objective mentioned above, the present invention provides the following solution:

[0042] A charging pile includes a charging pile body and a noise-absorbing duct device as described in any one of the above descriptions.

[0043] The sound-absorbing duct device is installed at least one of the air inlets and outlets of the main body of the charging pile.

[0044] Since the charging pile provided by the present invention includes any of the above-mentioned noise reduction duct devices, the beneficial effects of the above-mentioned noise reduction duct devices are all included in the charging pile disclosed by the present invention. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A three-dimensional structural schematic diagram of the noise-absorbing duct device provided by the present invention;

[0047] Figure 2 An exploded structural diagram of the noise-absorbing duct device provided by the present invention;

[0048] Figure 3 A cross-sectional structural schematic diagram of the noise-absorbing duct device provided by the present invention;

[0049] Figure 4 This is a cross-sectional view of the microperforated cavity provided by the present invention;

[0050] Figure 5 A partial three-dimensional structural diagram of the micro-perforated cavity provided by the present invention when a plug is installed at the connecting hole;

[0051] Figure 6 A three-dimensional structural diagram of the plug and connecting strip connected together according to the present invention;

[0052] Figure 7 This is a three-dimensional structural diagram of a clamping plate and a micro-perforated cavity assembled together according to an embodiment of the present invention;

[0053] Figure 8 A three-dimensional structural diagram of a clamping plate and a micro-perforated cavity assembled together according to another embodiment of the present invention;

[0054] Figure 9A partial cross-sectional view of the noise-absorbing duct device provided by the present invention;

[0055] Figure 10 This is a three-dimensional structural diagram of the microperforated cavity provided by the present invention;

[0056] Figure 11 A three-dimensional structural diagram of the clamp provided by the present invention;

[0057] Figure 12 A partial three-dimensional structural diagram of the slidably connected micro-perforated cavity and clamping plate provided by the present invention;

[0058] Figure 13 A partial three-dimensional structural diagram of the sound-absorbing material layer installed in the sound-absorbing duct device provided by the present invention;

[0059] Figure 14 An exploded structural diagram of the connection between the sound-absorbing duct device and the side door provided by the present invention;

[0060] Figure 15 This is a cross-sectional view of the fan module and the noise-absorbing duct device provided by the present invention when they are assembled together.

[0061] in, Figures 1-15 middle:

[0062] Silencing duct 101, silencing duct device 100, micro-perforated cavity 102, connecting hole 102a, clamping plate 103a, clamping plate assembly 103, side plate 104, first air duct 101a, second air duct 101b, slide rail 102b, slide groove 103a-1, limiting hole 103a-3, plug 105, connecting strip 106, sound-absorbing material layer 107, second flange 104a, first flange 103a-2, fan module 200, side door 300. Detailed Implementation

[0063] The following will refer to the appendices in the embodiments of the present invention. Figure 1-15 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0064] In the description of this invention, it should be understood that the terms "upper," "lower," "top surface," "bottom surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] Combination Figures 1-3 As shown, the first aspect of the present invention provides a noise reduction duct device 100 for reducing the noise of a device to be noise-reduced. The device to be noise-reduced can be a fan module in a charging pile or other noise-generating devices.

[0066] The silencing duct device 100 is provided with a silencing duct 101 and a micro-perforated cavity 102. The number of silencing ducts 101 and micro-perforated cavities 102 is unlimited and can be set according to specific needs.

[0067] The silencing duct 101 is open at both ends, with one end connecting to the outside air and the other end connecting to the air inlet or outlet of the noise reduction device. It should be noted that the silencing duct 101 can be any duct capable of achieving noise reduction, and its specific shape and length are determined according to the required installation space.

[0068] The micro-perforated cavity 102 is disposed on the gas flow path of the silencing duct 101 and is connected to the silencing duct 101 through a connecting hole 102a opened on the micro-perforated cavity 102, wherein there is at least one connecting hole 102a. Figure 4 As shown, with the diameter of the connecting hole 102a as d, the number of connecting holes 102a as N, the internal volume of the micro-perforated cavity 102 as V, and the wall thickness of the sidewall of the micro-perforated cavity 102 where the connecting holes 102a are located as t, then the frequency at which the micro-perforated cavity 102 silences is... ,in, G is the conductivity and c is the speed of sound. The frequency of noise reduction is adjusted by adjusting the aperture of the connecting hole 102a, the number of connecting holes 102a, the wall thickness of the sidewall of the micro-perforated cavity 102 with the connecting holes 102a, and the internal volume of the micro-perforated cavity 102.

[0069] When there are multiple connecting holes 102a, and the number of connecting holes 102a needs to be adjusted to achieve the desired adjustment of the noise reduction frequency, the present invention discloses that the noise reduction duct device 100 also includes a plug 105, such as... Figure 5As shown, the plug 105 can be detachably used to block the connecting hole 102a. It should be noted that the plug 105 can be an elastic plug made of rubber material to facilitate the installation and removal of the plug from the connecting hole 102a. Of course, the plug 105 can also be made of rigid material and snapped into the connecting hole 102a.

[0070] When the number of plugs 105 is at least two, in order to improve the efficiency of assembling and disassembling the plugs 105 and the connecting hole 102a, this invention discloses that adjacent plugs 105 are connected by a connecting strip 106, such as... Figure 6 As shown.

[0071] The connecting strip 106 may be made of the same material as the plug 105 and integrally formed, or it may be made of other materials, and / or the connecting strip 106 and the plug 105 may be detachably connected.

[0072] The silencing duct device 100 provided by the present invention achieves noise reduction in two ways by setting a silencing duct 101 and a micro-perforated cavity 102, thereby achieving noise reduction of the device to be noise-reduced.

[0073] In some embodiments, the number of micro-perforated cavities 102 is at least one, and at least one micro-perforated cavity 102 is located within the silencing duct 101 to divide the silencing duct 101 into at least two sections with different cross-sections, thereby forming an expansion cavity duct. That is, in addition to its silencing function, the micro-perforated cavity 102 also serves to change a portion of the cross-sectional area of ​​the silencing duct 101, thereby forming an expansion cavity duct. This avoids the need for additional protrusions or other components within the silencing duct 101 to alter its cross-section, reducing the number of components, simplifying the structure, and saving costs.

[0074] In some embodiments, the silencing duct device 100 includes a clamping plate assembly 103 and a side plate 104. The clamping plate assembly 103 includes at least two clamping plates 103a, and the adjacent clamping plates 103a are spaced apart by a preset distance. It should be noted that the preset distance is specifically set according to the frequency band to be silenced.

[0075] Side plates 104 block and fix both sides of the clamping plate assembly 103. Specifically, side plates 104 can be a single piece of plate, capable of fixing one side of all clamping plates 103a. Alternatively, they can connect only two or three adjacent clamping plates 103a. The side plates 104 and clamping plates 103a form at least one silencing air duct 101. That is, when there are two clamping plates 103a, the side plates 104 and two clamping plates 103a form one silencing air duct 101; the side plates 104 and three clamping plates 103a form two silencing air ducts 101, and so on. The specific number of clamping plates 103a is set according to the specific structure of the noise reduction device to be noise-reduced. When there are two or more silencing air ducts 101, regenerated noise caused by airflow competition between the air ducts of the noise reduction device is avoided.

[0076] In some embodiments, at least one micro-perforated cavity 102 is provided on the surface of each adjacent clamping plate 103a facing the other. That is, the micro-perforated cavity 102 may be provided on only one clamping plate 103a facing the other, or the micro-perforated cavity 102 may be provided on both clamping plates 103a facing the other.

[0077] When the number of micro-perforated cavities 102 within a single silencing duct 101 is greater than or equal to two, the micro-perforated cavities 102 are spaced apart along the gas flow direction within the silencing duct 101 to divide the silencing duct 101 into at least two segments with different cross-sections. In other words, the micro-perforated cavities 102 within the silencing duct 101 configure it as an expansion cavity duct containing at least two segments with different cross-sections. This avoids the need to separately install protrusions on the clamping plate 103a to alter the cross-section of the silencing duct 101 to form an expansion cavity duct, saving material and improving the silencing effect. Furthermore, the expansion cavity duct is suitable for low-to-mid-frequency silencing, while the micro-perforated cavities 102 are suitable for mid-to-high-frequency silencing, achieving omnidirectional silencing coverage from low to high frequencies.

[0078] Furthermore, in adjacent clamping plates 103a, at least one micro-perforated cavity 102 is provided on the surface facing each other, and the micro-perforated cavities 102 on the surfaces facing each other in adjacent clamping plates 103a are alternately arranged, such as... Figure 3 As shown, taking two adjacent clamping plates 103a, each with a micro-perforated cavity 102 on its face facing the other, and these two micro-perforated cavities 102 located at different ends of the two clamping plates 103a respectively, the clamping plates 103a are divided into two types. Type 1 clamping plates 103a located at both ends of the clamping plate assembly 103 have micro-perforated cavities 102 on only one side, such as... Figure 7 As shown; another type is located in the middle of the clamping plate assembly 103. This type of clamping plate 103a has micro-perforated cavities 102 on both sides, such as... Figure 8 As shown.

[0079] It should be noted that different micro-perforated cavities 102 within the same anechoic duct can be identical to eliminate noise in the same frequency band, or they can be different to eliminate noise in different frequency bands. Similarly, micro-perforated cavities 102 within different anechoic ducts can be identical to eliminate noise in the same frequency band, or they can be different to eliminate noise in different frequency bands.

[0080] A first air duct 101a is formed between adjacent micro-perforated cavities 102 to create a sound-absorbing air duct 101, specifically, as shown in... Figure 9 As shown, the projection of the micro-perforated cavity 102 onto the adjacent micro-perforated cavity 102 falls on the micro-perforated cavity 102, thus making the sidewalls of the adjacent micro-perforated cavities 102 form a first air duct 101a.

[0081] A second air duct 101b is formed between the micro-perforated cavity 102 and the facing clamp 103a, creating a sound-absorbing air duct 101. The first air duct 101a and the second air duct 101b are connected, and the cross-sections of the first air duct 101a and the second air duct 101b are different to form an expansion cavity air duct. Specifically, the cross-section of the first air duct 101a can be larger than the cross-section of the second air duct 101b, or the cross-section of the second air duct 101b can be larger than the cross-section of the first air duct 101a. Taking the case where the cross-section of the first air duct 101a is larger than the cross-section of the second air duct 101b as an example... Figure 9 As shown, the first air duct 101a and the second air duct 101b connected at both ends are not on a straight line, which realizes the change of wind direction and further reduces noise.

[0082] The connecting hole 102a is formed on the side wall of the micro-perforated cavity 102 surrounding the first air duct 101a. Of course, it can also be formed on the side wall of the micro-perforated cavity 102 surrounding the second air duct 101b.

[0083] It should be noted that the number of connecting holes 102a, the hole diameter, and the inner volume of the micro-perforated cavity 102 on different micro-perforated cavities 102 can be set to be the same or different.

[0084] Furthermore, the present invention discloses that the micro-perforated cavity 102 is open at both ends and sealed by the side plate 104. It can be understood that the micro-perforated cavity 102 is positioned at both ends along the vertical side plate 104. It should be noted that the micro-perforated cavity 102 can also be configured as a closed cavity with both ends closed.

[0085] In some embodiments, the micro-perforated cavity 102 is adjustablely mounted on the clamping plate 103a along the direction from the inlet to the outlet of the silencing duct 101, thereby realizing the adjustment of the distance between the micro-perforated cavities 102, which is convenient for silencing the gas to be silencing in different frequency bands.

[0086] At the abrupt change in sound waves between the first air duct 101a and the second air duct 101b, reflection occurs due to impedance mismatch, causing noise attenuation. Acoustic performance is the most important evaluation indicator for noise reduction, with transmission loss L... TL As an important physical quantity for evaluating attenuation, the transmission loss L in each frequency band TL Calculated using the following formula:

[0087]

[0088] In the formula, L pi The incident sound pressure level, dB; L pt The transmitted sound pressure level is dB; K i The background noise correction value for the incident sound, in dB; K t This is the correction value for the background noise of transmitted sound, in dB; S i The cross-sectional area upstream of the silencing channel is m. 2 S t The cross-sectional area downstream of the silencing channel is m. 2 In this embodiment, S t Corresponding to the cross-section of the second air duct 101b, S i Corresponding to the cross-section of the first air duct 101a, it can be seen that adjusting S t It can eliminate noise in different frequency bands; adjust S i It can also eliminate noise in different frequency bands.

[0089] In order to achieve the adjustment of S t This invention discloses a micro-perforated cavity 102 and a clamping plate 103a, one of which is provided with a slide rail 102b, and the other is provided with a sliding groove 103a-1. The slide rail 102b and the sliding groove 103a-1 are slidably engaged. Figures 10-12 As shown. In order to avoid the slide rail 102b falling off from the slide groove 103a-1, the present invention discloses that the cross-section of the slide rail 102b is T-shaped, and correspondingly, the cross-section of the slide groove 103a-1 is also T-shaped.

[0090] When the micro-perforated cavity 102 is moved into place, it can be fixed at that position on the clamping plate 103a by fasteners such as bolts.

[0091] Furthermore, the present invention discloses that limiting holes 103a-3 are opened on the clamping plate 103a, and the sliding length of the micro-perforated cavity 102 is limited by the cooperation of the limiting holes 103a-3 and fasteners. Specifically, there are multiple limiting holes 103a-3 arranged at intervals along the sliding groove 103a-1, and the sliding distance of the micro-perforated cavity 102 is adjusted by setting fasteners in different limiting holes 103a-3.

[0092] It is understood that the connection method between the micro-perforated cavity 102 and the clamping plate 103a disclosed above is only one specific embodiment of the present invention. In practical applications, it can also be set in other ways. For example, at least one of the micro-perforated cavity 102 and the clamping plate 103a is provided with an elongated hole or a plurality of connecting holes arranged at intervals, and is connected to the other in an adjustable position by fasteners.

[0093] In order to adjust S i The present invention discloses that the clamping plate 103a is adjustablely connected to the side plate 104 along the direction of being close to or far from the adjacent clamping plate 103a.

[0094] Furthermore, the present invention discloses that in the clamping plate 103a and the side plate 104, one is provided with a guide rail and the other is provided with a guide groove, wherein the guide rail and the guide groove are slidably connected.

[0095] Of course, at least one of the clamping plate 103a and the side plate 104 can be provided with an elongated hole or a plurality of spaced connecting holes to adjust the relative position of the clamping plate 103a and the side plate 104. For ease of connection, this invention discloses that the clamping plate 103a is provided with a first flange 103a-2, and the first flange 103a-2 is provided with an elongated hole or a plurality of spaced connecting holes to achieve the connection between the clamping plate 103a and the side plate 104.

[0096] In some embodiments, the silencing duct device 100 further includes a sound-absorbing material layer 107, such as Figure 13 As shown, it should be noted that the sound-absorbing material layer 107 is laid on the inner wall of the silencing duct 101 and the inner wall of the micro-perforated cavity 102. Understandably, the sound-absorbing material layer 107 may or may not be laid on the surface of the micro-perforated cavity 102 where the connecting hole 102a is opened. When the sound-absorbing material layer 107 is laid, it does not obstruct the connecting hole 102a.

[0097] The present invention eliminates high and mid frequency noise by laying a sound-absorbing material layer 107 on the inner wall of the silencing duct 101 and the inner wall of the micro-perforated cavity 102.

[0098] In some embodiments, the two ends of the silencing duct 101 have a preset height difference. Through reasonable arrangement, external rainwater and other external water can be prevented from entering the silencing duct 101 and then entering the noise reduction device, causing damage to the noise reduction device.

[0099] When the silencer duct device 100 is installed at the air inlet of the noise reduction device, the inlet of the silencer duct 101 is lower than the outlet of the silencer duct 101.

[0100] When the silencer duct 101 is installed at the air outlet of the noise reduction device, the outlet of the silencer duct 101 is lower than the inlet of the silencer duct 101.

[0101] In some embodiments, the side plate 104 is provided with a second flange 104a that is connected to the noise reduction device, so that the whole can be connected to the noise reduction device through the second flange 104a.

[0102] A second aspect of the present invention provides a charging pile, including a charging pile body and a noise-absorbing duct device 100 as described in any of the above embodiments.

[0103] At least one of the air inlets and outlets of the charging pile body is equipped with a sound-absorbing air duct device 100.

[0104] like Figure 14 As shown, the silencing duct device 100 is installed inside the charging pile body and connected to the side door 300 of the charging pile body. The number of silencing channels in the silencing duct device 100 is equal to the number of fan modules 200 inside the charging pile body, and they are arranged in a one-to-one correspondence. The air flow direction is as follows: Figure 15 The arrow in the image indicates the direction.

[0105] Since the charging pile provided by the present invention includes the noise reduction duct device 100 in any of the above embodiments, the beneficial effects of the noise reduction duct device 100 are all included in the charging pile disclosed by the present invention.

[0106] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0107] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and inventive features disclosed herein.

[0108] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0109] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A noise-absorbing duct device (100), characterized in that, For noise reduction of the device to be noise-reducing, the silencing duct device (100) is provided with a silencing duct (101) and a micro-perforated cavity (102). The silencing duct (101) is open at both ends, with one end for connecting to the outside air and the other end for connecting to the air inlet or outlet of the noise reduction device. The micro-perforated cavity (102) is disposed on the gas flow path of the silencing duct (101) and is connected to the silencing duct (101) through a connecting hole (102a) opened on the micro-perforated cavity (102). The number of the micro-perforated cavities (102) is at least one, and at least one of the micro-perforated cavities (102) is located in the silencing duct (101) to divide the silencing duct (101) into at least two sections with different cross sections to form an expansion cavity duct. The position of the micro-perforated cavity (102) along the direction from the inlet to the outlet of the silencing duct (101) is adjustable to achieve the distance adjustment between the micro-perforated cavities (102).

2. The silencing duct device (100) according to claim 1, characterized in that, Includes a clamping plate assembly (103) and a side plate (104); The clamping plate assembly (103) includes at least two clamping plates (103a), and the adjacent clamping plates (103a) are spaced apart by a preset distance. The side plate (104) blocks and fixes both sides of the clamping plate assembly (103) to form at least one of the sound-absorbing air ducts (101) together with the clamping plates (103a).

3. The silencing duct device (100) according to claim 2, characterized in that, In the adjacent clamps (103a), at least one of the micro-perforated cavities (102) is provided on the surface of the clamps facing each other, so as to divide the sound-absorbing duct (101) into at least two sections with different cross sections; When the number of the micro-perforated cavities (102) is greater than or equal to 2, the micro-perforated cavities (102) are spaced apart along the gas flow direction in the silencing duct (101).

4. The silencing duct device (100) according to claim 2, characterized in that, In each of the adjacent clamps (103a), at least one micro-perforated cavity (102) is alternately arranged on the face facing the other. A first air duct (101a) of the silencing air duct (101) is formed between adjacent micro-perforated cavities (102), and a second air duct (101b) of the silencing air duct (101) is formed between the micro-perforated cavity (102) and the facing clamp (103a). The first air duct (101a) and the second air duct (101b) are connected, and the cross-section of the first air duct (101a) is different from the cross-section of the second air duct (101b) to form an expansion cavity air duct. The connecting hole (102a) is opened on the side wall of the micro-perforated cavity (102) surrounding the first air duct (101a), or the connecting hole (102a) is opened on the side wall of the micro-perforated cavity (102) surrounding the second air duct (101b).

5. The silencing duct device (100) according to claim 4, characterized in that, The micro-perforated cavity (102) is adjustablely mounted on the clamp (103a) along the direction from the inlet to the outlet of the silencing duct (101).

6. The silencing duct device (100) according to claim 5, characterized in that, In the micro-perforated cavity (102) and the clamping plate (103a), one is provided with a slide rail (102b), and the other is provided with a slide groove (103a-1) that slides with the slide rail (102b). or At least one of the micro-perforated cavity (102) and the clamping plate (103a) is provided with an elongated hole or a plurality of connecting holes arranged at intervals, and is connected to the other in an adjustable position by fasteners.

7. The silencing duct device (100) according to claim 2, characterized in that, The clamping plate (103a) is arbitrarily connected to the side plate (104) along a direction that is close to or far from the adjacent clamping plate (103a).

8. The silencing duct device (100) according to claim 7, characterized in that, Of the clamping plate (103a) and the side plate (104), one is provided with a guide rail, and the other is provided with a guide groove that is slidably connected to the guide rail; or At least one of the clamping plate (103a) and the side plate (104) is provided with an elongated hole or a plurality of connecting holes arranged at intervals, so as to adjust the relative position of the clamping plate (103a) and the side plate (104).

9. The silencing duct device (100) according to claim 1, characterized in that, The number of connecting holes (102a) opened on the micro-perforated cavity (102) is multiple; The silencing duct device (100) also includes a plug (105) that can be detachably sealed to the connecting hole (102a).

10. The silencing duct device (100) according to claim 9, characterized in that, The number of plugs (105) is at least 2, and adjacent plugs (105) are connected by connecting strips (106).

11. The silencing duct device (100) according to claim 1, characterized in that, It also includes sound-absorbing material layers (107) respectively laid on the inner wall of the silencing duct (101) and the inner wall of the micro-perforated cavity (102).

12. The silencer duct device (100) according to any one of claims 1-11, characterized in that, The two ends of the silencing duct (101) have a preset height difference; When the silencing duct device (100) is installed at the air inlet of the noise reduction device, the inlet of the silencing duct (101) is lower than the outlet of the silencing duct (101); When the silencing duct (101) is installed at the air outlet of the noise reduction device, the outlet of the silencing duct (101) is lower than the inlet of the silencing duct (101).

13. The silencing duct device (100) according to any one of claims 2-8, characterized in that, The micro-perforated cavity (102) is open at both ends and sealed by the side plate (104); and / or The clamping plate (103a) is provided with a first flange (103a-2) that is connected to the side plate (104). and / or The side plate (104) is provided with a second flange (104a) that is connected to the noise reduction device.

14. A charging pile, characterized in that, It includes the charging pile body and the noise-absorbing duct device (100) as described in any one of claims 1-13. At least one of the air inlet and air outlet of the charging pile body is equipped with the noise reduction duct device (100).

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