Charging pile

Abstract

The utility model discloses a charging pile, and relates to the technical field of charging piles, the charging pile comprises a housing, a charging module and an arc-shaped diversion member, the housing comprises a first side plate and a second side plate which are opposite to each other, the bottom of the first side plate is provided with an air inlet, and the bottom of the second side plate is provided with an air outlet; the charging module is installed in the shell and located above the air inlet and the air outlet in the vertical direction of the shell. The charging module comprises a module body and a module fan, and the air inlet direction of the module fan faces the first side plate; the arc-shaped flow guide part is arranged on the inner wall surface of the first side plate and / or the second side plate; the arc-shaped flow guide piece is provided with a curved surface protruding part facing the inner cavity of the shell, and airflow entering the shell from the air inlet flows through the arc-shaped flow guide piece. According to the technical scheme, airflow is attached to the curved surface of the arc-shaped flow guide part to flow through the coanda effect, so that pressure loss is reduced, and the problems of fan power consumption, noise and temperature rise are solved.

Description

Technical Field

[0001] This utility model relates to the field of charging pile technology, and in particular to a charging pile. Background Technology

[0002] Currently, the installation environment of charging piles (such as underground parking lots and residential spaces) may reflect and amplify noise, causing adverse effects. Therefore, it is necessary to ensure that the noise level of charging piles during operation meets the quiet requirements of most scenarios. Charging piles generate a lot of heat when operating at high power. Typically, system fans and module fans are used to cool down the heat-generating components such as charging modules and cables to ensure stable equipment operation.

[0003] In some existing solutions, a system fan (such as an axial fan) is usually set up to exhaust air from the outlet. In order to reduce the noise of the system fan, an air duct is usually set up and sound insulation panels and / or sound-absorbing materials are installed in the air duct to reduce the noise of the fan. These factors cause airflow obstruction, and the fan needs more power to maintain the airflow, thus generating noise and reduced efficiency. Utility Model Content

[0004] The main purpose of this utility model is to propose a charging pile that, by setting an arc-shaped flow guide inside the charging pile, allows the airflow to adhere to the curved surface of the arc-shaped flow guide through the Coanda effect, thus making the fluid flow smoother, reducing energy loss, thereby reducing pressure loss, and further reducing the power consumption, noise and temperature rise of the fan.

[0005] To achieve the above objectives, the charging pile proposed in this utility model includes:

[0006] The housing includes a first side plate and a second side plate opposite to each other, the first side plate having an air inlet at the bottom and the second side plate having an air outlet at the bottom;

[0007] A charging module is installed inside the housing and is positioned above the air inlet and outlet in the vertical direction of the housing; the charging module includes a module body and a module fan, the air inlet direction of the module fan facing the first side plate; and

[0008] An arc-shaped air guide is provided on the inner wall surface of at least the first side plate and / or the second side plate; the arc-shaped air guide has a curved protrusion facing the inner cavity of the housing, and the airflow entering the housing from the air inlet flows through the arc-shaped air guide.

[0009] In one embodiment, the charging pile further includes a heat dissipation duct extending along the inner wall of the second side plate and communicating with the air outlet. The heat dissipation duct is provided with a system fan opposite to the wall of the second side plate. The system fan is arranged opposite to the charging module. The arc-shaped guide is fixed to the inner wall of the second side plate and located inside the heat dissipation duct.

[0010] In one embodiment, the arc-shaped guide has an airfoil or circular arc shape in its cross-sectional shape parallel to the height direction of the housing.

[0011] In one embodiment, the arc-shaped flow guide is configured as a flow guide plate, the two ends of the flow guide plate are connected to the second side plate, and the middle of the flow guide plate protrudes in a direction away from the second side plate to form the curved protrusion.

[0012] In one embodiment, the charging pile further includes a reactive silencer, which is disposed at the air outlet along the airflow direction, and the arc-shaped guide is disposed upstream of the reactive silencer.

[0013] In one embodiment, the resistive silencer has a silencer cavity communicating with the air outlet and a vent communicating with the silencer cavity and the heat dissipation duct, wherein the area of ​​the vent is smaller than the minimum cross-sectional area of ​​the silencer cavity in the direction perpendicular to its axis.

[0014] In one embodiment, the resistive silencer includes two cavity side plates and a cavity back plate. The cavity back plate is opposite to the inner wall of the housing. The two cavity side plates are respectively connected to opposite sides of the cavity back plate. The cavity side plates, the cavity back plate, and the inner wall of the second side plate together enclose the silencer cavity.

[0015] The arc-shaped air guide is located at the end of the silencing cavity away from the air inlet, and the arc-shaped air guide, together with the cavity back plate and the two cavity side plates, defines the ventilation opening.

[0016] In one embodiment, the system fan is configured as a plurality of axial fans disposed on the heat dissipation duct, the plurality of axial fans being arranged at intervals along the height direction of the second side plate, and the air outlet side of the axial fans facing the second side plate.

[0017] In one embodiment, the straight-line distance from the wall of the heat dissipation duct where the axial fan is located to the surface of the second side plate is L3, where L3 ≥ 100 mm.

[0018] In one embodiment, the distance from the upper edge of the air outlet to the bottom of the nearest axial fan is L4, where L4 ≥ 200 mm.

[0019] In one embodiment, the first side plate is provided with an air inlet channel communicating with the air inlet, the air inlet channel having an air passage communicating with the interior of the housing, wherein the area of ​​the air passage is smaller than the minimum cross-sectional area of ​​the air inlet channel perpendicular to the airflow direction.

[0020] In one embodiment, the air vent extends through the air inlet channel along an axis perpendicular to the air inlet channel.

[0021] In one embodiment, the air inlet channel is located below the module fan in the vertical direction.

[0022] The technical solution of this utility model adopts a staggered layout of the charging module and the air inlet / outlet, which, compared to the air inlet / outlet being directly opposite the charging module, extends the direct noise propagation path and reduces external sound energy leakage. Furthermore, the air inlet / outlet at the bottom forces noise to bypass the sound-absorbing structure inside the casing, further reducing fan noise. The relatively arranged first and second side plates enhance natural convection, ensuring the heat dissipation effect of the charging pile. The arc-shaped guide plate utilizes the airflow adhesion characteristics to optimize flow and noise reduction, that is, the airflow adheres to the curved convex part of the guide plate, reducing turbulence separation and reducing fan pressure loss (increased fan power consumption leads to more heat generation, and higher noise at high speeds), thus optimizing flow and noise reduction. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of a charging pile according to an embodiment of the present utility model;

[0025] Figure 2 A schematic diagram of another embodiment of providing an arc-shaped flow guide for the first side plate;

[0026] Figure 3 A schematic diagram of another embodiment of providing an arc-shaped flow guide for the second side plate;

[0027] Figure 4 This is a structural schematic diagram of another embodiment of the charging pile provided by this utility model.

[0028] Explanation of icon numbers:

[0029] 10. Housing; 11. First side panel; 111. Air inlet; 12. Second side panel; 121. Air outlet; 112. First sound absorption area; 122. Second sound absorption area;

[0030] 20. Resistant silencer; 21. Silencing cavity; 211. Ventilation opening; 22. Cavity back plate; 221. Straight edge section; 222. Beveled edge section; 23. Cavity side plate;

[0031] 30. Charging module; 31. Module body; 32. Module fan;

[0032] 40. Arc-shaped air guide; 41. Curved convex part;

[0033] 50. Heat dissipation air duct; 51. Second filter;

[0034] 60. Air inlet channel; 61. Air outlet; 62. First filter screen

[0035] 70. System fan; 71. Axial flow fan;

[0036] 80. Sound-absorbing materials.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] Currently, the installation environment of charging piles (such as underground parking lots and residential spaces) may reflect and amplify noise, causing adverse effects. Therefore, it is necessary to ensure that the noise level of charging piles during operation meets the quiet requirements of most scenarios. Charging piles generate a lot of heat when operating at high power. Typically, system fans and module fans are used to cool down the heat-generating components such as charging modules and cables to ensure stable equipment operation.

[0042] In some existing solutions, a system fan (such as an axial fan) is usually set up to exhaust air from the outlet. In order to reduce the noise of the system fan, an air duct is usually set up and sound insulation panels and / or sound-absorbing materials are installed in the air duct to reduce the noise of the fan. These factors cause airflow obstruction, and the fan needs more power to maintain the airflow, thus generating noise and reduced efficiency.

[0043] This utility model proposes a charging pile. By setting an arc-shaped flow guide inside the charging pile, the airflow is allowed to flow on the curved surface of the arc-shaped flow guide through the Coanda effect. This makes the fluid flow smoother, reduces energy loss, thereby reducing pressure loss and thus reducing the power consumption, noise and temperature rise of the fan.

[0044] Please see Figures 1 to 4 In one embodiment of this utility model, the charging pile includes a housing 10, a charging module 30, and an arc-shaped air guide 40. The charging module 30 is disposed inside the housing 10 and includes a module body 31 and a module fan 32 for heat dissipation of the module body 31. The housing 10 is also the casing of the DC charging pile. The housing 10 is usually an impact-resistant metal / non-metal shell to protect the internal components, while optimizing the air duct design to reduce noise.

[0045] The housing 10 houses a charging module 30, a main controller, a human-machine interface, a billing system, a cooling system, safety protection devices, a charging gun, and cables. The charging module 30 converts grid AC power into high-voltage DC power to directly charge the electric vehicle's battery. It typically consists of multiple parallel power units, supporting high-power output (e.g., kW-kW). The main controller coordinates the charging process, monitors the charging pile's status (voltage, current, temperature, etc.), and communicates with the vehicle's BMS (Battery Management System) to ensure charging safety and efficiency. The human-machine interface includes a touchscreen or button panel, displaying charging status, fees, fault information, etc.; it supports user interaction such as scanning codes, swiping cards, and inputting commands. The billing system integrates an electricity meter, a billing module, and a payment terminal (supporting Alipay, WeChat, credit cards, etc.) to achieve billing based on electricity consumption or time and generate transaction records.

[0046] DC charging piles generate a significant amount of heat during high-power operation. The cooling system uses fans, heat sinks, or liquid cooling devices to cool the charging module 30, cables, and other heat-generating components, ensuring stable equipment operation. Safety protection devices include leakage protection, overvoltage / overcurrent protection, emergency stop buttons, and surge protection to prevent electrical accidents and personal injury. The charging gun features a high-power DC charging interface (such as CCS, CHAdeMO, or GB / T standards), a built-in temperature sensor, and an electronic lock to ensure reliable connection and charging safety.

[0047] Air enters the housing 10 through the air inlet 111 to dissipate heat from the charging module 30, and then the hot air is discharged through the air outlet 121 to cool down the charging module 30, cables and other heat-generating components, ensuring stable operation of the equipment.

[0048] The first side plate 11 and the second side plate 12 are on opposite sides of the housing 10. The charging module 30 is installed inside the housing 10 and is located above the air inlet 111 and the air outlet 121 in the vertical direction of the housing 10. The air inlet axis of the module fan 32 is perpendicular to the surface of the first side plate 11, and the air outlet direction points to the second side plate 12. Because the air outlet 121 is lower than the charging module 30, it can reduce the noise transmission of the charging module 30 to a certain extent.

[0049] The technical solution of this utility model adopts a staggered layout of the charging module 30 and the air inlet / outlet 121, which, compared to the air inlet / outlet 121 being directly opposite the charging module 30, extends the direct noise propagation path and reduces the leakage of sound energy. Furthermore, the air inlet / outlet 121 at the bottom forces the noise to bypass the sound-absorbing structure inside the housing 10, further reducing the fan noise. The relatively arranged first side plate 11 and second side plate 12 enhance natural convection and ensure the heat dissipation effect of the charging pile. The arc-shaped guide 40 utilizes the airflow adhesion characteristics to optimize flow and noise reduction, that is, the airflow adheres to the curved protrusion 41 of the guide plate, reducing turbulence separation and reducing fan pressure loss (increased fan power consumption leads to more heat generation, and high noise at high speed), thus optimizing flow and noise reduction.

[0050] In one embodiment, reference is made to Figure 2 The arc-shaped guide 40 is disposed on the inner wall surface of the first side plate 11 and is located downstream of the air inlet 111 in the airflow path.

[0051] In one embodiment, reference is made to Figure 1 and Figure 3 and Figure 4 The arc-shaped guide 40 is disposed on the inner wall surface of the second side plate 12 and is located downstream of the air outlet 121 in the airflow path.

[0052] In one embodiment, combined with Figure 1 and Figure 2The arc-shaped guide 40 is disposed on the inner wall surface of the first side plate 11 and the second side plate 12. When the airflow entering the housing 10 from the air inlet 111 flows through the arc-shaped guide 40, it adheres to the curved protrusion 41 due to the Coanda effect, reducing turbulence separation and reducing fan pressure loss (increased fan power consumption will lead to more heat generation and high noise at high speed), thus optimizing flow and reducing noise.

[0053] In other embodiments, Figure 1 The first side plate 11 can be adopted Figure 2 The method of setting the arc-shaped guide 40 can also be used in Figure 4 An arc-shaped air guide 40 is further installed inside the air inlet channel 60 of the first side panel 11; or it can be cancelled. Figure 4 In the air inlet channel 60, an arc-shaped guide 40 is provided on the first side plate 11 in the downstream direction of the air inlet 111; that is to say, in the scheme of arranging air ducts for charging piles, the arc-shaped guide 40 can also be set on the inner wall of the air duct.

[0054] Pressure loss, also known as pressure drop, refers to the energy loss of a fluid during flow due to factors such as friction, turbulence, and changes in direction. In the ventilation system of a charging station, factors such as right-angle turns, changes in cross-section, or internal obstacles can obstruct airflow, requiring the fan to have greater power to maintain airflow, thus causing noise and reduced efficiency.

[0055] The Coanda effect refers to the characteristic that high-speed airflow tends to adhere to adjacent convex curved surfaces. For example, when airflow flows through the convex curved surface of the arc-shaped guide 40 at a certain speed, due to the viscosity of the fluid, the airflow will adhere to the curved surface and flow along its contour, avoiding premature separation of the airflow and the formation of turbulence. The adhered flow reduces the pressure loss caused by airflow separation. In addition, it can also force the airflow to flow along a preset path (such as away from sensitive components or noise leakage areas), improving heat dissipation and noise reduction efficiency.

[0056] Some existing solutions typically involve setting up a system fan 70 (such as an axial flow fan) to exhaust air from the air outlet 121. In order to reduce the noise of the system fan 70, an air duct is usually set up and an impedance silencer is formed by installing sound insulation panels and / or sound-absorbing materials 80 in the air duct to reduce the noise of the system fan 70.

[0057] Reference Figure 1 , Figure 3 and Figure 4 Specifically, the charging pile also includes a heat dissipation duct 50 extending along the inner wall of the second side plate 12. The heat dissipation duct 50 is provided with a system fan 70 relative to the wall of the second side plate 12. The arc-shaped guide 40 is fixed to the inner wall of the second side plate 12 and located inside the heat dissipation duct 50.

[0058] The heat dissipation duct 50 connects to the air outlet 121 and extends to the top of the second side plate 12. Normally, hot air rises naturally, and extending the heat dissipation duct 50 to the top of the second side plate 12 can more effectively dissipate heat from the charging module 30 and improve the heat dissipation effect. At the same time, extending the heat dissipation duct 50 to the top and lengthening the airflow path can also increase the noise reduction effect over a certain length (increasing the number of sound wave reflections and absorptions, thereby reducing the noise transmitted to the outside). It can be understood that the charging module 30 is the main heat source. By pointing the air inlet side of the system fan 70 at the charging module 30, the hot air around the charging module 30 can be directly drawn in, improving the heat dissipation efficiency.

[0059] Combination Figure 4 Specifically, the system fan 70 consists of multiple axial fans 71 mounted on the heat dissipation duct 50. The multiple axial fans 71 are arranged at intervals along the height direction of the second side plate 12. The air inlet side of at least one axial fan 71 corresponds to the charging module 30, and the air outlet side of the axial fan 71 faces the second side plate 12.

[0060] The placement of the axial fan 71's outlet side directly opposite the second side plate 12 is related to airflow guidance and noise control. This direct alignment with the side plate encourages airflow along the plate, reducing turbulence and wind shear noise. Simultaneously, the second side plate 12 incorporates sound-absorbing material 80 to further absorb fan noise. Furthermore, this arrangement creates back pressure, optimizing fan efficiency, or guides airflow outwards through the side plate structure (such as duct design), preventing backflow.

[0061] The specific number of axial fans 71 is not limited. For example, multiple groups can be arranged horizontally and vertically, with two or three fans spaced apart along the height of each group.

[0062] Reference Figure 4 Specifically, to ensure sufficient distance to avoid airflow obstruction, reduce turbulence and noise, and guarantee effective heat dissipation, the minimum straight-line distance from the wall of the cooling duct 50 where the axial fan 71 is located to the surface of the second side plate 12 is L3, where L3 ≥ 100mm. If L3 is too small (e.g., < 50mm), it will restrict airflow diffusion, causing high-speed airflow to directly impact the side plate, inducing turbulence and backflow, increasing pressure loss. L3 ≥ 100mm provides sufficient space for uniform airflow diffusion, reducing pressure loss to within the design threshold.

[0063] The maximum size of L3 is limited by the size of housing 10 and the distance between the power modules.

[0064] Specifically, the distance from the upper edge of the air outlet 121 to the bottom of the nearest axial fan 71 is L4, where L4 ≥ 200mm. Due to the overall height constraint of the unit, L4 allows for more interaction between the airflow and sound-absorbing structures (such as sound-absorbing material 80 and the shape of the air duct) along a longer path, thus reducing noise.

[0065] Regarding the measurement of L3, a point is taken on the inner wall of the heat dissipation duct 50, and the distance is measured at the corresponding point on the normal projection position of the same center point on the inner wall of the second side plate 12 (facing the inner wall of the heat dissipation duct 50).

[0066] Regarding the measurement of L4, the distance is measured at the vertical projection position of the bottom of the nearest axial fan 71 impeller, at the upper edge apex of the effective ventilation area of ​​the air outlet 121 (excluding decorative structures, with the actual highest point of the air outlet 211 as the reference).

[0067] The second side plate 12 is also provided with a second sound-absorbing area 122, which corresponds to the axial fan 71. The second sound-absorbing area 122 is provided with sound-absorbing material 80. In one embodiment, the sound-absorbing material 80 is configured as sound-absorbing cotton (open-pore sound-absorbing cotton, ceramic fiber cotton); in other embodiments, it may also be aluminum foam or a micro-perforated plate + cavity structure.

[0068] The sound-absorbing cotton directly absorbs the sound energy radiated by the axial flow fan. At the same time, the sound-absorbing cotton reduces the noise of the airflow and sound waves mixing in the duct by increasing damping. Through high-frequency directional absorption, duct resonance suppression, and turbulence noise attenuation, the fan noise can be precisely controlled while maintaining heat dissipation efficiency.

[0069] Reference Figure 3 Specifically, a second filter 51 is also provided inside the heat dissipation duct 50, located below the axial fan 71. When the air outlet 121 is not in operation (such as when the machine is stopped or under low load), external foreign objects (leaves, insects, debris) may be sucked in due to airflow pressure. The second filter 51 prevents foreign objects from entering the duct, reducing the risk of fan impeller jamming; moreover, the flow equalization effect of the filter makes the airflow more evenly distributed after passing through the mesh.

[0070] The arc-shaped flow guide 40 has an airfoil or arc shape in its cross-sectional shape parallel to the height direction of the housing 10; in one embodiment, common shapes of the arc-shaped flow guide 40 include curved arcs, tapered or expanded streamlined structures, or flow guides with specific angles.

[0071] In one embodiment, the arc-shaped guide 40 is configured as a guide plate, such as an airfoil profile guide plate, an arc plate, a tapered arc guide plate, an S-shaped hyperbolic guide plate, or a perforated corrugated guide plate (the surface has corrugated protrusions and uniformly distributed micropores).

[0072] In one embodiment, the arc-shaped guide member 40 is configured such that both ends of the guide plate are connected to the second side plate 12, and the middle of the guide plate protrudes in a direction away from the second side plate 12 to form a curved protrusion 41.

[0073] When the airflow entering the housing 10 from the air inlet 111 flows through the arc-shaped guide 40, it adheres to the curved protrusion 41 due to the Coanda effect. The principle is that when the airflow flows through the convex surface of the arc-shaped guide 40 at a certain speed, due to the viscosity of the fluid, the airflow will adhere to the curved surface and flow along its contour, avoiding premature separation of the airflow and the formation of turbulence. The adhered flow reduces the pressure loss caused by airflow separation.

[0074] Reference Figure 1 To reduce noise during the operation of the charging pile, in this embodiment, a reactive silencer 20 is also provided in the heat dissipation duct 50. The reactive silencer 20 is located at the air outlet 121, and the arc-shaped guide 40 is located upstream of the reactive silencer along the airflow direction from the heat dissipation duct 50 through the air outlet 121. Generally speaking, in other embodiments, the reactive silencer 20 can be provided independently, such as by placing the reactive silencer 20 at the air outlet 121 and placing the arc-shaped guide 40 upstream of the reactive silencer 20 along the airflow direction to improve the noise reduction effect; alternatively, the reactive silencer 20 can also be provided at the air inlet 111 to improve the noise reduction effect of the charging pile; of course, the reactive silencer 20 can also be provided at the air inlet 111, and the arc-shaped guide 40 can be provided above the air outlet 111, etc.

[0075] The resistive silencer 20 can be combined with the sound-absorbing material 80 in the heat dissipation duct 50 to absorb noise in different frequency bands, thereby improving the noise reduction effect while meeting the heat dissipation performance requirements.

[0076] Specifically, the working principle of the reactive silencer 20 is based on the principle of acoustic filters. By abruptly changing the cross-section of the pipe (such as expansion or contraction), the sound waves are reflected and interfered during propagation, thereby weakening the sound energy at a specific frequency and achieving a noise reduction effect.

[0077] Specifically, the resistive silencer 20 has a silencer cavity 21 that connects to the air outlet 121 and a vent 211 that connects the silencer cavity 21 and the heat dissipation duct 50. The area of ​​the vent 211 is smaller than the minimum cross-sectional area of ​​the silencer cavity 21 in the direction perpendicular to its axis.

[0078] It's important to distinguish that pure impedances (such as expansion chambers / resonant cavities) rely solely on abrupt changes in the pipe cross-section or side resonant cavities to generate reflections / interference to attenuate specific frequency bands. This causes sound waves to reflect and interfere during propagation, thereby weakening the sound energy at specific frequencies and achieving a noise reduction effect.

[0079] To reduce pressure loss caused by the installation of the reactive silencer 20, the reactive silencer 20 includes two cavity side plates 23 and a cavity back plate 22. The cavity back plate 22 is opposite to the inner wall of the housing 10. The two cavity side plates 23 are respectively connected to the opposite sides of the cavity back plate 22. The cavity side plates 23, the cavity back plate 22 and the inner wall of the second side plate 12 together form a silencing cavity 21. An arc-shaped guide 40 is provided at the end of the silencing cavity 21 away from the air inlet 111. The arc-shaped guide 40, the cavity back plate 22 and the two cavity side plates 23 define the ventilation opening 211.

[0080] The cavity back plate 22 includes a straight edge section 221 and a beveled edge section 222. The beveled edge section 222 is connected to the lower edge of the air outlet 121. The straight edge section 221 is arranged opposite to the second side plate 12 and forms part of the cavity side plate 23 silencing cavity 21. The straight edge section 221 and the beveled edge section 222 intersect at an angle, which facilitates gas exhaust and prevents dust and rainwater from entering the heat dissipation air duct 50.

[0081] The system fan 70 reduces fan noise by facing the second side plate 12, and the second side plate 12 is provided with a second sound absorption area 122 corresponding to the second opening. The second sound absorption area 122 is provided with sound absorption material 80, which can further absorb noise.

[0082] The airflow in the air intake and heat dissipation duct 50 enters the silencing cavity 21 through the vent 211. The area of ​​the vent 211 is smaller than the minimum cross-sectional area of ​​the silencing cavity 21 perpendicular to its axis, thus forming an expansion-type resistive silencer 20.

[0083] The airflow and sound waves are forced to pass through the resistive silencer 20 before they can escape from the shell 10 to the outside. The sound waves are repeatedly reflected in the silencer cavity 21, and the energy is consumed, further reducing noise. In this way, the sound-absorbing material 80 forms a dual-channel composite silencer design with impedance and resistance. Through low-frequency reflection and high-frequency absorption, the sound source is isolated, which can reduce noise across the entire frequency band while maintaining heat dissipation efficiency.

[0084] The arc-shaped air guide 40 is located at the end of the silencing cavity 21 away from the air inlet 111. The arc-shaped air guide 40, together with the cavity back plate 22 and the two cavity side plates 23, defines the ventilation opening 211. The arc-shaped air guide 40 guides the airflow flowing in the heat dissipation duct 50 to generate the Coanda effect on the arc-shaped air guide 40. The airflow will adhere to the curved surface and flow along its contour, avoiding premature airflow separation and the formation of turbulence. The adhered flow reduces the pressure loss caused by airflow separation, thereby reducing the pressure loss caused by airflow before entering the silencing cavity 21.

[0085] Reference Figure 4Furthermore, in order to prevent noise from flowing out of the housing 10 from the air inlet 111, the first side plate 11 is provided with an air inlet channel 60 that connects to the air inlet 111. The air inlet channel 60 has an air passage 61 that connects to the interior of the housing 10. The area of ​​the air passage 61 is smaller than the minimum cross-sectional area of ​​the air inlet channel 60 perpendicular to the airflow direction.

[0086] Thus, due to the abrupt changes in the cross-section of the air inlet duct 60 and the air outlet 61 (such as expansion or contraction), the air inlet duct 60 forms a reactive silencer 20, causing sound waves to be reflected and interfered with during propagation, thereby weakening the sound energy at specific frequencies and achieving a noise reduction effect. The airflow is accelerated when entering the duct, and the noise is reflected multiple times when it enters, and the energy is gradually dissipated and reduced, thus achieving multi-objective optimization of heat dissipation efficiency and noise suppression.

[0087] Specifically, the air inlet 61 extends through the air inlet channel 60 along an axis perpendicular to the air inlet channel 60.

[0088] Specifically, the air inlet duct 60 is located vertically below the modular fan 32.

[0089] The charging module 30 and module fan 32 are located at the top, and the air inlet 111 is at the bottom. The airflow needs to flow upward to carry away the heat.

[0090] The air inlet 61 extends through the air inlet channel 60 along the axis perpendicular to the air inlet channel 60. The air inlet channel 60 is located below the charging module 30 in the vertical direction and is closed at the bottom. The ventilation opening 211 extends through the width of the housing 10, forming two opposing ventilation openings 211. The two opposing ventilation openings 211 form a symmetrical sound source, forcing the sound waves to detour from the side to the ventilation opening 211. The extended path increases the attenuation of low and medium frequency noise (such as transformer vibration).

[0091] Charging piles typically have a certain size specification. Under the same specification, the size of the air inlet 111 usually remains unchanged. Specifically, in order to increase the reflection path and dissipate more energy, the vertical distance from the lower edge of the opening of the air outlet 61 away from the bottom plate of the air duct to the upper edge of the air inlet 111 is L1, where L1 ≥ 100mm. If L1 is too small (< 100mm), the airflow entering from the air inlet 111 may flow out directly through the air outlet 61, forming an airflow short circuit, resulting in insufficient airflow for power module heat dissipation. L1 provides distance attenuation for sound wave propagation, reducing noise (such as fan whistling) leakage through the air inlet 111.

[0092] The vertical distance from the upper surface of the air duct base plate to the bottom of the charging module 30 is L2, and L2 ≥ 200mm. L2 provides space for mechanical vibration attenuation, reduces structural vibration transmitted from the base plate to the module, and improves noise reduction effect.

[0093] The upper limit of L1 is constrained by the total height of the chassis; the upper limit of L1 is the total height of the chassis. 30mm high charging module L2.

[0094] Measurements of L1 and L2.

[0095] The upper edge of the air inlet 111 is the lowest point of the top edge of the air inlet 111, and the lower edge of the air outlet 61 is the highest point of the bottom edge of the opening away from the bottom plate.

[0096] The upper surface of the base plate is the center point of the flat area after removing the reinforcing ribs and solder joints, and the bottom of the module is the vertical projection position of the lowest point of the module mounting surface.

[0097] Specifically, the air inlet channel 60 is also equipped with a first filter 62. This can prevent dust or debris from directly entering the air outlet 61, thereby improving the IP protection level. It can also prevent dust or debris from being carried into the housing 10 by the wind when the system is not running.

[0098] Furthermore, the first side panel 11 is also provided with a first sound-absorbing area 112, on which sound-absorbing material 80 is arranged, and the first sound-absorbing area 112 corresponds to the module fan 32.

[0099] The area of ​​the first sound-absorbing area 112 covers the area of ​​the power module. The noise generated from the power module can be absorbed by the sound-absorbing material 80 of the first sound-absorbing area 112. The first sound-absorbing area 112 is rectangular. In one embodiment, the sound-absorbing material 80 is configured as sound-absorbing cotton (open-pore sound-absorbing cotton, ceramic fiber cotton); in other embodiments, it may also be aluminum foam or micro-perforated plate + cavity structure.

[0100] The noise from the modular fan 32 is primarily high-frequency, and the sound-absorbing cotton directly absorbs the high-frequency sound energy radiated by the fan. At the same time, the sound-absorbing cotton reduces the noise from the mixing of airflow and sound waves in the duct by increasing damping. The first sound-absorbing zone 112 achieves precise control of fan noise through high-frequency directional absorption, duct resonance suppression, and turbulence noise attenuation, while maintaining heat dissipation efficiency.

[0101] Specifically, to improve the noise absorption effect of the sound-absorbing cotton, the first sound-absorbing area 112 is located above the air inlet channel 60 on the first side plate 11, and the first sound-absorbing area 112 extends to the top edge of the air inlet channel 60. In other embodiments, it may also be disposed within the air inlet channel 60; or disposed on other side plates of the housing 10.

[0102] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A charging pile, characterized in that, include: The housing includes a first side plate and a second side plate opposite to each other, the first side plate having an air inlet at the bottom and the second side plate having an air outlet at the bottom; A charging module is installed inside the housing and is located above the air inlet and air outlet in the vertical direction of the housing; the charging module includes a module body and a module fan, and the air inlet direction of the module fan is towards the first side plate; as well as An arc-shaped air guide is provided on the inner wall surface of at least the first side plate and / or the second side plate; the arc-shaped air guide has a curved protrusion facing the inner cavity of the housing, and the airflow entering the housing from the air inlet flows through the arc-shaped air guide.

2. The charging pile as described in claim 1, characterized in that, The charging pile also includes a heat dissipation duct extending along the inner wall of the second side plate and connecting to the air outlet. The heat dissipation duct is provided with a system fan opposite to the wall of the second side plate. The system fan is arranged opposite to the charging module. The arc-shaped guide is fixed to the inner wall of the second side plate and located inside the heat dissipation duct.

3. The charging pile as described in claim 1, characterized in that, The arc-shaped flow guide has an airfoil or arc shape in its cross-section parallel to the height direction of the housing; and / or, the arc-shaped flow guide is configured as a flow guide plate, the two ends of the flow guide plate are connected to the second side plate, and the middle of the flow guide plate protrudes in a direction away from the second side plate to form the curved convex part.

4. The charging pile as described in claim 2, characterized in that, The charging pile also includes a reactive silencer, which is located at the air outlet along the airflow direction, and the arc-shaped air guide is located upstream of the reactive silencer.

5. The charging pile as described in claim 4, characterized in that, The resistive silencer has a silencer cavity that connects to the air outlet and a vent that connects the silencer cavity and the heat dissipation duct. The area of ​​the vent is smaller than the minimum cross-sectional area of ​​the silencer cavity in the direction perpendicular to its axis.

6. The charging pile as described in claim 5, characterized in that, The resistive silencer includes two cavity side plates and a cavity back plate. The cavity back plate is opposite to the inner wall of the housing. The two cavity side plates are respectively connected to opposite sides of the cavity back plate. The cavity side plates, the cavity back plate, and the inner wall of the second side plate together enclose the silencer cavity. The arc-shaped air guide is located at the end of the silencing cavity away from the air inlet, and the arc-shaped air guide, together with the cavity back plate and the two cavity side plates, defines the ventilation opening.

7. The charging pile as described in claim 2, characterized in that, The system fan is configured as multiple axial fans installed on the heat dissipation duct. The multiple axial fans are arranged at intervals along the height direction of the second side plate, and the air outlet side of the axial fans faces the second side plate.

8. The charging pile as described in claim 7, characterized in that, The straight-line distance from the wall of the heat dissipation duct where the axial fan is located to the surface of the second side plate is L3, where L3 ≥ 100 mm. And / or, the distance from the upper edge of the air outlet to the bottom of the nearest axial fan is L4, where L4 ≥ 200 mm.

9. The charging pile as described in claim 1, characterized in that, The first side plate is provided with an air inlet channel that connects to the air inlet. The air inlet channel has an air passage that connects to the interior of the housing. The area of ​​the air passage is smaller than the minimum cross-sectional area of ​​the air inlet channel perpendicular to the airflow direction.

10. The charging pile as described in claim 9, characterized in that, The air vent extends through the air inlet channel along an axis perpendicular to the air inlet channel; and / or, the air inlet channel is located below the module fan in the vertical direction.

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