Silencing air duct and power conversion equipment
By setting a bent partition in the main body of the air duct of the charging pile and dividing it into multiple channels, the problem of high noise in traditional charging piles is solved and a better noise reduction effect is achieved.
Patent Information
- Application Number
- CN202420086028.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-12
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-01-12
AI Technical Summary
The inlet and outlet air ducts of traditional charging piles adopt direct inlet and outlet ventilation, which leads to the leakage of the sound of the air-cooling system and the greater environmental noise.
A sound silence air duct is designed, and a bending partition is provided in the main body of the air duct and divided it into at least two channels. Each channel has a segment of different cross-sectional area, increasing the number of sound wave reflections to achieve sound wave attenuation.
It effectively reduces environmental noise, and achieves a good sound silencing effect by increasing the number of sound wave reflections and increasing the sound resistance.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of silencing, in particular to a silencing air duct and a power conversion device. Background Art
[0002] As the main charging equipment for new energy vehicles, charging piles have to have higher power to meet higher charging efficiency. As a result, the demand for heat dissipation performance of internal power modules is getting higher and higher, and the number of fans in the air cooling system is also increasing. The noise generated during the operation of the air cooling system is transmitted to the external environment through the air inlet and exhaust port of the charging pile. However, the inlet and outlet air ducts of traditional charging piles mostly adopt a straight-in and straight-out ventilation method, which can easily cause sound leakage of the air cooling system and lead to relatively large environmental noise. Utility Model Content
[0003] The main purpose of the utility model is to provide a sound-absorbing air duct, aiming at reducing the problem of environmental noise.
[0004] To achieve the above-mentioned purpose, the silencer air duct proposed in the utility model comprises an air duct main body and a bent partition plate; the air duct main body has an air inlet and an air outlet; the bent partition plate is arranged in the air duct main body, and divides the air duct main body into at least two channels, the air inlet end of each channel is connected to the air inlet, and the air outlet end of each channel is connected to the air outlet, and the channel has at least two sections with different cross-sectional areas and connected to each other.
[0005] In one embodiment, at least two of the bent partitions are provided, and at least two of the bent partitions are spaced apart in a direction forming an angle with the direction of the air inlet, and one end of the bent partition away from the air inlet is bent toward the direction of the air outlet.
[0006] In one embodiment, the bent partition has at least two bending angles, and the air duct main body has a first side wall and a second side wall arranged adjacent to the side where the air inlet is located, the first side wall and the second side wall are arranged opposite to each other, and the openings of at least two adjacent bending angles are respectively facing the first side wall and the second side wall.
[0007] In one embodiment, the direction of the air inlet is arranged at an angle to the center line of the air outlet.
[0008] In one embodiment, the air duct body has an opposite wall opposite to the air inlet, and a distance is provided between the bent partition plate and the opposite wall.
[0009] In one embodiment, the air inlet and the air outlet are respectively arranged on two opposite wall surfaces of the air duct body.
[0010] In one embodiment, a vent, a protrusion or a recess is provided on the cavity wall of at least one of the channels.
[0011] In one embodiment, a reinforcement plate is further provided in the silencer air duct, wherein the reinforcement plate is connected to the bent partition plate at an angle, and the reinforcement plate divides the channel into at least two sub-channels, wherein the air inlet end of each sub-channel is connected to the air inlet, and the air outlet end of each sub-channel is connected to the air outlet.
[0012] In one embodiment, a sound absorbing member is fixedly mounted on the bent partition plate.
[0013] In one embodiment, the sound-absorbing air duct further includes a fastener, the fastener is connected to the bent partition plate, and the sound-absorbing member is sandwiched between the fastener and the bent partition plate.
[0014] The utility model also provides a power conversion device, comprising a housing and the above-mentioned silencer air duct, wherein the housing has a plurality of air inlet holes and a plurality of air outlet holes, and the silencer air duct is installed at the air inlet holes and / or the air outlet holes.
[0015] In one embodiment, the air inlet and the air outlet are respectively opened on two opposite sides of the housing.
[0016] In the silencer air duct proposed by the utility model, by setting a bent partition in the air duct main body, the bent partition can separate the air duct main body into at least two channels, and each channel has at least two sections with different cross-sectional areas and interconnected with each other, so that when the sound wave passes through the channel in the silencer air duct, the number of reflections of the sound wave can be increased, so that the sound wave is attenuated, and the risk of the sound wave propagating to the outside of the silencer air duct is reduced, thereby achieving a better noise reduction effect. In addition, after the bent partition separates the air duct main body into at least two channels, the cross-sectional area of each channel is smaller than the cross-sectional area of the air duct main body, thereby increasing the sound resistance and effectively achieving the effect of silencer. When the silencer air duct is applied to devices such as charging piles and frequency converters that require heat dissipation, the silencer air duct can fit tightly with the shells of these devices, so that the silencer air duct and the shell together form a silencer cavity with noise reduction effect, and the sound wave can be continuously dissipated and attenuated when the local resonance of the silencer cavity occurs, so as to further achieve a better silencer effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0018] Figure 1 This is a structural schematic diagram of an embodiment of the silencer air duct of the utility model;
[0019] Figure 2 for Figure 1 A longitudinal cross-sectional view of the middle silencer air duct;
[0020] Figure 3 for Figure 1 A schematic structural diagram of an example of a bent partition in a middle sound-absorbing air duct;
[0021] Figure 4 for Figure 1 A schematic structural diagram of another example of a bent partition in a middle sound-absorbing air duct;
[0022] Figure 5 This is a schematic structural diagram of another embodiment of the silencer air duct of the utility model;
[0023] Figure 6 for Figure 5 A longitudinal cross-sectional view of the middle silencer air duct;
[0024] Figure 7 This is a structural schematic diagram of another embodiment of the silencer air duct of the utility model;
[0025] Figure 8 It is a longitudinal cross-sectional view of the silencer air duct of the utility model;
[0026] Fig. 9 This is a structural schematic diagram of another embodiment of the silencer air duct of the utility model;
[0027] Fig.10 for Fig. 9 A longitudinal cross-sectional view of the middle silencer air duct;
[0028] Fig.11 This is a structural schematic diagram of another embodiment of the silencer air duct of the utility model;
[0029] Fig.12 It is a schematic diagram of the assembly structure of the bent partition plate, the silencer and the fastener in the silencer air duct of the utility model;
[0030] Fig.13 It is a structural schematic diagram of an embodiment of the power conversion device of the utility model.
[0031] Description of Figure Numbers:
[0032]
[0033]
[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0038] The utility model provides a sound-absorbing air duct 100 .
[0039] In the embodiments of the present utility model, please refer to Figures 1 to 11 The silencer air duct 100 includes an air duct body 110 and a bent partition plate 120; the air duct body 110 has an air inlet 111 and an air outlet 112; the bent partition plate 120 is arranged in the air duct body 110, and divides the air duct body 110 into at least two channels, the air inlet end of each channel is connected to the air inlet 111, and the air outlet end of each channel is connected to the air outlet 112, and the channel has at least two sections with different cross-sectional areas and connected to each other.
[0040] When used, the silencer air duct 100 can be used in charging piles, household appliances or other devices with relatively high noise.
[0041] The air duct body 110 refers to a collection of all channels for airflow to pass through. The air duct body 110 can be a rectangular box structure, or can be an arc box or a trapezoidal box. The air duct body 110 has an air inlet 111 and an air outlet 112. The air inlet 111 refers to an air inlet 111 with a larger air inlet area, and the air outlet 112 is an outlet for airflow to flow out of the air duct body 110.
[0042] The bending partition 120 refers to a non-straight plate-shaped body. The bending partition 120 can be formed by bending a straight plate to form a plate structure with an acute or obtuse bending angle, or bend into an arc-shaped plate with a certain curvature. By arranging the bending partition 120 in the air duct body 110, the bending partition 120 can separate the air duct body 110 into at least two channels for airflow to pass through. Specifically, when there is one bending partition 120 (please refer to Figure 7 and Figure 8 ), the bent partition 120 can separate the air duct body 110 into two channels; when there are two bent partitions 120, and the two bent partitions 120 are arranged in an angled direction with the direction of the air inlet 111 (please refer to Figure 1 and Figure 2 ), the bent partition 120 can divide the air duct body 110 into three channels; when there are three bent partitions 120, and the three bent partitions 120 are arranged in an angled direction with the direction of the air inlet 111 (please refer to Figure 5 and Figure 6 ), the bent partition 120 can divide the air duct main body 110 into four channels, etc. The air inlet end of each channel is connected to the air inlet 111, and the air outlet end of each channel is connected to the air outlet 112, so that each channel can provide airflow at the same time, thereby having little impact on the ventilation area and improving the air intake efficiency. In addition, by arranging the bent partition 120 in the air duct main body 110, after the bent partition 120 divides the air duct main body 110 into at least two channels, the cross-sectional area of each channel is smaller than the cross-sectional area of the air duct main body 110, thereby increasing the sound resistance and effectively achieving the effect of sound elimination. In addition, the channel has at least two segments with different cross-sections and interconnected, that is, at least one position with a sudden change in cross-sectional area, which can increase the number of reflections of sound waves in each channel, thereby attenuating the sound waves, reducing the risk of sound waves propagating outward, and achieving a better noise reduction effect. When the silencer air duct is used in devices that require heat dissipation, such as charging piles and inverters, the silencer air duct can fit tightly with the shells of these devices, so that the silencer air duct and the shell together form a silencer cavity with noise reduction effect. When local resonance occurs in the silencer cavity, the sound waves can be continuously dissipated and attenuated to further achieve a better silencer effect.
[0043] It should be noted that the passage in the technical solution of the utility model has at least two sections with different cross-sectional areas and interconnected, which means that the passage is decomposed into at least two sections with different cross-sectional areas and interconnected along the flow direction of the airflow. Figure 6 For example, when the bending corner of the bending partition 120 is provided with one, the bending corner of the bending partition 120 (for example Figure 6 Of course, in other examples, when there are two bending angles of the bending partition 120, the bending angle of the bending partition 120 can also be used as a dividing point, and the plane cut out by the cross section passing through the dividing point and perpendicular to the direction of the air inlet 111 can be used as the interface between the two segments with different cross-sectional areas and connected to each other. It can be understood that when there are two bending angles, there can be two interfaces, and the channel can be divided into three segments with different cross-sectional areas and connected to each other.
[0044] In the technical solution of the utility model, by setting a bent partition 120 in the air duct main body 110, the bent partition 120 can separate the air duct main body 110 into at least two channels, and each channel has at least two sections with different cross-sectional areas and interconnected with each other, so that when the sound wave passes through the channel in the silencer air duct 100, the number of reflections of the sound wave can be increased, so that the sound wave is attenuated, and the risk of the sound wave propagating to the outside of the silencer air duct 100 is reduced, thereby achieving a better noise reduction effect. By connecting the two ends of each channel to the air inlet 111 and the air outlet 112 of the air duct main body 110 respectively, each channel can be used for airflow to pass, thereby having less impact on the ventilation area. In addition, after the bent partition 120 separates the air duct main body 110 into at least two channels, the cross-sectional area of each channel is smaller than the cross-sectional area of the air duct main body 110, thereby increasing the sound resistance and effectively achieving the effect of silencer. When the silencer duct 100 is applied to devices that require heat dissipation, such as charging piles and inverters, the silencer duct 100 can fit tightly with the shells of these devices, so that the silencer duct 100 and the shell together form a silencer cavity with noise reduction effect. When local resonance occurs in the silencer cavity, the sound waves can be continuously dissipated and attenuated to further achieve a better silencer effect.
[0045] Further, please refer to Figure 1 , Figure 2 , Figure 5 , Figure 6 , Fig. 9 and Fig.10At least two bent partitions 120 are provided, and at least two bent partitions 120 are arranged at intervals along a direction forming an angle with the direction of the air inlet 111, and one end of the bent partition 120 away from the air inlet 111 is bent toward the direction of the air outlet 112.
[0046] When there are at least two bent baffles 120, the air duct body 110 can be divided into three or more channels, thereby further reducing the cross-sectional area of each channel, further increasing the acoustic resistance, and effectively improving the silencing effect of the silencing air duct 100. Specifically, the lengths of these bent baffles 120 can be set to be the same, or the lengths of at least two bent baffles 120 can be set to be different. When the air inlet 111 is facing upward, at least two bent baffles 120 can be arranged horizontally in a spaced manner (such as Figure 6 When the air inlet 111 is oriented to the left, at least two bent baffles 120 may be arranged at intervals along the horizontal front-to-back direction, or at least two bent baffles 120 may be arranged at intervals along the vertical direction (as shown). Fig. 9 and Fig.10 As shown). Alternatively, the plate surface of the side of the air duct body 110 provided with the air inlet 111 is inclined downwardly extending in a direction at an acute angle to the horizontal plane, so the air inlet 111 is inclined upwardly arranged. At this time, at least two bent partitions 120 can still be arranged in a horizontal left-right direction, or at least two bent partitions 120 can be arranged in a horizontal front-back direction; or, the spacing direction of at least two bent partitions 120 is arranged perpendicular to the direction of the air inlet 111, etc. Of course, in other examples, it should be noted that the above is only an exemplary embodiment of the arrangement of at least two bent partitions 120. In this example, it is sufficient as long as the bent partitions 120 can separate the air duct body 110 into at least two channels.
[0047] When at least two bent partitions 120 are arranged at intervals, the intervals between every two adjacent bent partitions 120 can be set to be the same or different.
[0048] In this example, by bending the side of at least two bent partitions 120 away from the air inlet 111 toward the air outlet 112, the air outlet end of each channel can be connected to the air outlet 112, so that air can pass through each channel and be blown out from the air outlet 112. Specifically, the side of the bent partition 120 away from the air inlet 111 can be connected to the wall surface provided with the air outlet 112, and can also be connected to other wall surfaces of the air duct body 110 where the air outlet 112 is not provided.
[0049] Further, please refer to Figure 1 , Figure 2, Fig. 9 and Fig.10 The bent partition 120 has at least two bending corners 121a, and the air duct body 110 has a first side wall 110c and a second side wall 110d arranged adjacent to the side where the air inlet 111 is located. The first side wall 110c and the second side wall 110d are arranged opposite to each other, and the openings of at least two adjacent bending corners 121a are respectively facing the first side wall 110c and the second side wall 110d.
[0050] The air duct body 110 may be in the shape of a rectangular parallelepiped. When the air inlet 111 is disposed on the bottom surface of the air duct body 110, the first side wall 110c and the second side wall 110d may be respectively as follows: Figure 2 The left and right side walls shown are perpendicular to the paper plane, or the first side wall 110c and the second side wall 110d can be the front side wall and the rear side wall parallel to the paper plane, respectively. Fig. 9 and Fig.10 As shown, when the air inlet 111 is disposed on the right side wall of the air duct body 110 and the air outlet 112 is disposed on the left side wall of the air duct body 110 , the first side wall 110 c and the second side wall 110 d may be the top wall and the bottom wall of the air duct body 110 , respectively.
[0051] It is understandable that the bend on the bend partition 120 can form two angles, one of which is a superior angle greater than 180° and less than 360°, and the other is an obtuse angle or an acute angle less than 180°, and the sum of these two angles is 360°. It should be noted that the bend angle 121a in this example refers to an obtuse angle or an acute angle less than 180° formed by the bend.
[0052] In addition, in this example, the openings of at least two adjacent bending corners 121a are respectively oriented toward the first side wall 110c and the second side wall 110d. The solutions include: 1. The bending partition 120 has two bending corners 121a, and the openings of the two bending corners 121a are respectively oriented toward the first side wall 110c and the second side wall 110d; 2. The bending partition 120 has three or more bending corners 121a, and the three adjacent bending corners 121a are defined as the first bending corner 121a, the second bending corner 121a and the third bending corner 121a. One of the openings of the first bending angle 121a and the second bending angle 121a faces the first side wall 110c, the other faces the second side wall 110d, and the opening of the third bending angle 121a faces the first side wall 110c or the second side wall 110d; or the opening of the first bending angle 121a faces the first side wall 110c or the second side wall 110d, and one of the openings of the second bending angle 121a and the third bending angle 121a faces the first side wall 110c, and the other faces the second side wall 110d. In addition, the bending angles 121a of at least two bending angles 121a may be the same or different.
[0053] In this example, by aligning the openings of at least two adjacent bending corners 121a toward the first side wall 110c and the second side wall 110d respectively, the sound waves can be better reflected when propagating in the channel, thereby increasing the attenuation of the sound waves and enhancing the noise reduction effect.
[0054] In an example, please refer to Figure 1 , Figure 2 , Figures 5 to 8 The direction of the air inlet 111 is set at an angle to the center line of the air outlet 112.
[0055] By setting the direction of the air inlet 111 at an angle to the center line of the air outlet 112, the airflow will turn after entering the silencer duct 100, which can further increase the length of the propagation path of the sound wave in the silencer duct 100, so as to further improve the degree of sound wave attenuation, thereby achieving a better noise reduction effect. Specifically, the direction of the air inlet 111 can be upward, and the center line of the air outlet 112 can be horizontal. For example, the center line of the air outlet 112 can be set in the horizontal left-right direction, or the center line of the air outlet 112 can be set in the horizontal front-to-back direction. Alternatively, the direction of the air inlet 111 can be tilted upward, and the center line of the air outlet 112 can be set in the horizontal left-right direction, or in the horizontal front-to-back direction. Alternatively, when the direction of the air inlet 111 is vertically upward, the center line of the air outlet 112 can be set in any direction that is at an angle to the vertical line.
[0056] Further, please refer to Figure 2 and Figure 6 The air duct body 110 has an opposite wall 110 b opposite to the air inlet 111 , and a distance is provided between the bent partition plate 120 and the opposite wall 110 b.
[0057] By providing a spacing between the bent partition 120 and the relative wall 110b of the air duct main body 110, the end of the bent partition 120 away from the air inlet 111 is closer to the air outlet 112, thereby facilitating better introduction of the airflow to the air outlet 112, so that the airflow can smoothly flow out through the air outlet 112 and enter the interior of power conversion equipment such as charging piles, so as to dissipate heat from power conversion equipment such as charging piles.
[0058] Specifically, the air duct body 110 may be a rectangular parallelepiped, and when the air inlet 111 of the air duct body 110 is disposed on the horizontally disposed bottom wall, the opposite wall 110b may be a top wall of the air duct body 110 that is parallel to the bottom wall. Alternatively, when the air duct body 110 is an irregular shape, if the air inlet 111 is disposed on the bottom wall of the air duct body 110, the opposite wall 110b of the air duct body 110 may be an inclined surface that is disposed opposite to the bottom wall and is disposed at an angle to the horizontal direction; or the opposite wall 110b may be a curved surface or a bent plate, etc.
[0059] In another example, please refer to Fig. 9 and Fig.10 The air inlet 111 and the air outlet 112 are respectively arranged on two opposite walls of the air duct body 110 .
[0060] By arranging the air inlet 111 and the air outlet 112 on two opposite walls of the air duct respectively, the airflow can be straight in and out, thereby improving the efficiency of the airflow through the silencer air duct 100 and further improving the heat dissipation efficiency of power conversion equipment such as charging piles.
[0061] Specifically, when the air duct body 110 is a rectangular parallelepiped, the left side wall is arranged opposite to the right side wall, the front side wall is arranged opposite to the rear side wall, and the top wall is arranged opposite to the bottom wall. The air inlet 111 and the air outlet 112 can be arranged on the left side wall and the right side wall of the air duct body 110, respectively, or the air inlet 111 and the air outlet 112 can be arranged on the front side wall and the rear side wall of the air duct body 110, respectively, or the air inlet 111 and the air outlet 112 can be arranged on the bottom wall and the top wall of the air duct body 110, respectively.
[0062] Further, please refer to Figure 3 and Figure 4 A vent 113, a protrusion 120a or a pit is also provided on the cavity wall of at least one channel.
[0063] The cavity wall of the channel can be the wall surface of the bent partition plate 120, or the wall surface of the air duct body 110. By providing a vent 113 on the cavity wall of the channel, the air inlet area of the muffler air duct 100 is increased, and the air inlet efficiency is improved. And by providing the vent 113, the sound wave can be disturbed at the vent 113 when passing through the muffler air duct 100, thereby further increasing the attenuation degree of the sound wave and improving the noise reduction effect of the muffler air duct 100. Specifically, the vent 113 can be provided with one, two or more. The vent 113 is provided on the cavity wall of one channel of the muffler air duct 100, or the vent 113 is provided on the cavity wall of two channels of the muffler air duct 100; or the vent 113 is provided on the cavity wall of multiple channels of the muffler air duct 100, etc. In addition, the shape of the vent 113 can be a grille hole, a rectangular hole, a circular hole or other special-shaped holes, etc.
[0064] In addition, a protrusion 120a or a concave pit may be provided on the cavity wall of the channel. Such a configuration enables these structures to have a turbulent effect on the sound waves passing therethrough, thereby further attenuating the sound waves and further improving the noise reduction effect. Specifically, one protrusion 120a or a concave pit may be provided, and two or more may be provided at intervals.
[0065] In one embodiment, if Fig.11 As shown, a reinforcing plate 150 is also provided in each channel, and the reinforcing plate 150 is connected to the bent partition plate 120 at an angle, and the reinforcing plate 150 divides the channel into at least two sub-channels, and the air inlet end of each sub-channel is connected to the air inlet 111, and the air outlet end of each sub-channel is connected to the air outlet 112.
[0066] It is understandable that when the surface area of the bending partition 120 is large, its support strength may decrease, which may easily cause the bending partition 120 to deform. In this embodiment, by further providing a reinforcing plate 150 in each channel, and the reinforcing plate 150 is connected to the bending partition 120 at an angle, the reinforcing plate 150 can provide a better support effect on the bending partition 120, thereby reducing the risk of deformation of the bending partition 120. In addition, by providing a gap between at least one side of the reinforcing plate 150 and the cavity wall of the channel, the risk of the reinforcing plate 150 separating the air inlet 111 and the air outlet 112 from each other and affecting the normal passage of the airflow can be avoided, ensuring that the airflow can flow smoothly from the air inlet 111 to the air outlet 112 in the channel.
[0067] Specifically, one side of the reinforcing plate 150 is connected to the bent baffle 120. Alternatively, two sides or three sides of the reinforcing plate 150 are connected to the bent baffle 120, thereby improving the connection strength between the reinforcing plate 150 and the bent baffle 120. The reinforcing plate 150 divides the channel into at least two sub-channels, which makes the cross-sectional area of the sub-channels smaller, thereby further increasing the acoustic resistance to achieve a better noise reduction effect.
[0068] In order to further improve the noise reduction effect, in the technical solution of the utility model, Fig.12 As shown, a sound absorbing member 130 is fixedly mounted on the bent partition plate 120 .
[0069] The sound absorbing member 130 is a porous material, which can be a foam material, porous glass fiber or foam aluminum, etc. By fixing the sound absorbing member 130 on the bent partition 120, the sound absorbing member 130 can further absorb the sound waves, thereby further reducing the risk of sound waves being transmitted to the outside and enhancing the noise reduction effect.
[0070] Specifically, the sound absorbing member 130 may be bonded, clamped or screwed to the bent partition plate 120 .
[0071] In one embodiment, if Fig.12 As shown, the sound-absorbing air duct 100 further includes a fastener 140 , which is connected to the bent partition plate 120 , and the sound-absorbing member 130 is sandwiched between the fastener 140 and the bent partition plate 120 .
[0072] By sandwiching the sound absorbing member 130 between the fastener 140 and the bent partition 120, the stability of the sound absorbing member 130 is improved, and the risk of the sound absorbing member 130 falling from the bent partition 120 is reduced. Specifically, the fastener 140 can be a pressure strip, a screw, a grille plate, a rigid or flexible mesh cover, etc. Specifically, when the fastener 140 and the bent partition 120 are connected, the fastener 140 and the bent partition 120 can be snap-connected. One of the fastener 140 and the bent partition 120 can be provided with a snap hole, and the other one can be provided with a snap, and by snapping the snap into the snap hole, the effect of snap connection between the fastener 140 and the bent partition 120 is achieved. Alternatively, when the fastener 140 is a screw, a threaded hole can be provided on the bent partition 120, and the fastener is threadedly connected to the threaded hole of the bent partition 120, thereby achieving the effect of connecting the fastener 140 and the bent partition 120. In addition, by sandwiching the sound absorbing member 130 between the fastener 140 and the bent partition 120, the sound absorbing member 130 can be stably installed on the bent partition 120, thereby reducing the risk of the sound absorbing member 130 falling. When the fastener 140 is a grille plate or a mesh cover, the fastener 140 and the bent partition 120 can still be screwed or clamped. In this way, on the one hand, the sound absorbing member 130 can be fastened and installed on the bent partition 120, and on the other hand, it can also have a good dustproof effect and reduce the degree of contamination of the sound absorbing member 130.
[0073] The utility model also provides a power conversion device, please refer to Figure 1 , Figure 2 as well as Fig.13 The power conversion device includes a housing 200 and a silencer duct 100. The specific structure of the silencer duct 100 refers to the above embodiment. Since the power conversion device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the housing 200 has a plurality of air inlets 210 and a plurality of air outlets 220, and the silencer duct 100 is installed at the air inlet 210 and / or the air outlet 220.
[0074] The power conversion device may be a charging pile, a frequency converter, an inverter or a converter.
[0075] The silencer duct 100 may be installed only at the air inlet 210, or the silencer duct 100 may be installed only at the air outlet 220. For example, when the air inlet 210 faces the residential area, the silencer duct 100 may be arranged on the side of the power conversion device where the air inlet 210 is provided, and the silencer duct 100 is not arranged on the side of the power conversion device where the air outlet 220 is provided. When the air outlet 220 faces the residential area, the silencer duct 100 may be arranged on the side of the power conversion device where the air outlet 220 is provided, and the silencer duct 100 is not arranged on the side of the power conversion device where the air inlet 210 is provided. Alternatively, two silencer ducts 100 are provided, and one of the above-mentioned silencer ducts 100 is installed on both the side of the power conversion device where the air inlet 210 is provided and the side of the air outlet 220 is provided. When the silencer duct 100 is installed at the air inlet 210, the air outlet 112 of the silencer duct 100 can be communicated with the air inlet 210 of the power conversion device, so that the airflow enters the silencer duct 100 from the air inlet 111 and / or the vent 113 of the silencer duct 100, flows into the air inlet 210 of the power conversion device through the air outlet 112 of the silencer duct 100, and further enters the housing 200. When the silencer duct 100 is installed at the air outlet 220 of the power conversion device, the air inlet 111 of the silencer duct 100 can be communicated with the air outlet 220 of the power conversion device, so that the airflow inside the housing 200 flows out from the air outlet 220 of the power conversion device and enters the air inlet 111 of the silencer duct 100, then enters the inside of the silencer duct 100, and finally flows out through the air outlet 112 and the vent 113 of the silencer duct 100. Specifically, all the air inlets 210 can be arranged on the same side of the housing 200, and the air outlets 220 can be arranged on the same side of the housing 200 with the air inlet 210, or can be arranged on a different side from the air inlet 210; or some of the air inlet 210 are arranged on one side of the housing 200, and the other part of the air inlet 210 is arranged on the other side of the housing, and all the air outlets 220 can be arranged on the same side as some of the air inlet 210, or some of the air outlets 220 are arranged on the same side as some of the air inlet 210, and the other part of the air outlets 220 are arranged on different sides from the air inlet 210. There are no specific requirements for the position and opening direction of the air inlet and outlet on the power conversion device in the technical solution of the utility model. When it is necessary to perform noise reduction processing on the power conversion device, it is only necessary to install the aforementioned silencer duct at the air inlet and / or the air outlet. The silencer duct 100 in the technical solution of the utility model has good compatibility. When the air inlet 210 is large or the number of air inlet holes 210 is large, at least two silencer ducts 100 may be provided as appropriate, so that each air inlet 210 can be connected to the silencer duct 100 to achieve a better noise reduction effect. When the air outlet 220 is large or the number of air outlet holes 220 is large, at least two silencer ducts 100 may be provided as appropriate, so that each air outlet 220 can be connected to the silencer duct 100 to achieve a better noise reduction effect.
[0076] Further, a power module 300 is provided in the housing 200 of the power conversion device, the number of the power modules 300 is the same as the number of channels formed in the muffler air duct 100, and each channel is provided corresponding to a power module 300. Alternatively, a fan 400 is provided in the housing 200, and the fan 400 is used to dissipate heat from the power module 300, the number of the fans 400 corresponds to the number of the power modules 300, and each fan 400 is connected to a channel in the muffler air duct 100, so that the flow distributed to each channel is more uniform, avoiding the phenomenon of wind grabbing, and improving the heat dissipation performance of the power conversion device.
[0077] Furthermore, the air inlet 210 and the air outlet 220 are respectively opened on two opposite sides of the housing 200 .
[0078] Specifically, one of the air inlet 210 and the air outlet 220 is opened on the front side of the shell 200, and the other one is opened on the rear side of the shell 200; or, one of the air inlet 210 and the air outlet 220 is opened on the left side of the shell 200, and the other one is opened on the right side of the shell 200.
[0079] By respectively opening the air inlet 210 and the air outlet 220 on opposite sides of the housing 200, the airflow inside the housing 200 can flow in and out directly, thereby achieving a better heat dissipation effect. In this example, by respectively opening the air inlet 210 and the air outlet 220 on opposite sides of the housing 200, compared with the case where the air inlet 210 and the air outlet 220 are opened on the same side of the housing 200, the noise is smaller and the risk of hot air backflow can be reduced.
[0080] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A sound-absorbing air duct, characterized in that: include: An air duct body, wherein the air duct body has an air inlet and an air outlet; and A bent partition is arranged in the air duct main body and divides the air duct main body into at least two channels, the air inlet end of each channel is connected to the air inlet, and the air outlet end of each channel is connected to the air outlet, and the channel has at least two sections with different cross-sectional areas and connected to each other.
2. The sound-absorbing air duct according to claim 1, characterized in that: At least two of the bent partitions are provided, and at least two of the bent partitions are spaced apart in a direction forming an angle with the direction of the air inlet, and one end of the bent partition away from the air inlet is bent toward the direction of the air outlet.
3. The sound-absorbing air duct according to claim 1, characterized in that: The bent partition has at least two bending angles, and the air duct main body has a first side wall and a second side wall arranged adjacent to the side where the air inlet is located, the first side wall and the second side wall are arranged opposite to each other, and the openings of at least two adjacent bending angles are respectively facing the first side wall and the second side wall.
4. The sound-absorbing air duct according to any one of claims 1 to 3, characterized in that: The direction of the air inlet is arranged at an angle to the center line of the air outlet.
5. The sound-absorbing air duct according to claim 4, characterized in that: The air duct body has an opposite wall opposite to the air inlet, and a distance is provided between the bent partition plate and the opposite wall.
6. The sound-absorbing air duct according to any one of claims 1 to 3, characterized in that: The air inlet and the air outlet are respectively arranged on two opposite wall surfaces of the air duct main body.
7. The sound-absorbing air duct according to claim 1, characterized in that: A vent, a protrusion or a recess is also provided on the cavity wall of at least one of the channels.
8. The sound-absorbing air duct according to claim 1, characterized in that: A reinforcing plate is also provided in the silencer air duct, which is connected to the bent partition plate at an angle, and the reinforcing plate divides the channel into at least two sub-channels, the air inlet end of each sub-channel is connected to the air inlet, and the air outlet end of each sub-channel is connected to the air outlet.
9. The sound-absorbing air duct according to claim 1, characterized in that: A sound absorbing component is fixedly mounted on the bent partition plate.
10. The sound-absorbing air duct according to claim 9, characterized in that: The sound-absorbing air duct further comprises a fastener, wherein the fastener is connected to the bent partition plate, and the sound-absorbing member is sandwiched between the fastener and the bent partition plate.
11. A power conversion device, characterized in that: It comprises a shell and a sound-absorbing air duct as described in any one of claims 1 to 10, wherein the shell has a plurality of air inlet holes and a plurality of air outlet holes, and the sound-absorbing air duct is installed at the air inlet holes and / or the air outlet holes.
12. The power conversion device according to claim 11, characterized in that: The air inlet and the air outlet are respectively arranged on two opposite sides of the shell.