Charging pile

Abstract

The application discloses a charging pile and relates to the technical field of charging piles, wherein the charging pile comprises a shell, a charging module and a resistive muffler, the periphery of the shell is respectively provided with an air inlet and an air outlet; the charging module comprises a module body and a module fan for heat dissipation of the module body; the resistive muffler is arranged at the air inlet and / or the air outlet, the resistive muffler has a muffling cavity and a ventilation opening communicating with the muffling cavity; wherein the area of the ventilation opening is smaller than the minimum cross-sectional area of the muffling cavity perpendicular to the axial direction of the muffling cavity. The technical scheme provided by the application effectively reduces noise by arranging the resistive muffler on the noise propagation path, and the heat dissipation requirement of the charging pile can be met.

Description

Technical Field

[0001] This invention 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. Summary of the Invention

[0003] The main objective of this invention is to propose a charging pile that utilizes the abrupt change in the cross-section of a reactive silencer to reflect sound waves and dissipate sound energy; and can be combined with sound-absorbing materials to absorb noise in different frequency bands, thereby improving noise reduction while meeting heat dissipation requirements.

[0004] To achieve the above objectives, the charging pile proposed in this invention includes: The housing has an air inlet and an air outlet on its periphery; A charging module, disposed within the housing, includes a module body and a module fan for dissipating heat from the module body; and A reactive silencer is provided at the air inlet and / or the air outlet, the reactive silencer having a silencing cavity and a vent communicating with the silencing cavity; wherein the area of ​​the vent is smaller than the minimum cross-sectional area of ​​the silencing cavity in the direction perpendicular to its axis.

[0005] In one embodiment, the area of ​​the vent is S1, and the minimum cross-sectional area of ​​the silencing cavity in the direction perpendicular to its axis is S2, wherein 2.5S1≤S2≤5S1.

[0006] In one embodiment, the resistive silencer includes a cavity bottom plate, two cavity side plates, and a cavity back plate; The cavity back plate is opposite to the inner wall of the shell, the two cavity side plates are respectively connected to the opposite sides of the cavity back plate, and the cavity bottom plate is connected to the cavity side plate and the cavity back plate at the end away from the air inlet. The cavity side plate, cavity back plate and cavity bottom plate together with the inner wall of the shell form the sound-absorbing cavity. The ventilation openings are provided on both of the cavity side plates; or the ventilation openings are provided on at least one cavity side plate and the cavity back plate; or the ventilation openings are provided on the cavity back plate.

[0007] In one embodiment, the housing includes a first side plate with the air inlet provided; the air inlet is near the bottom of the housing, the resistive silencer is disposed on the first side plate, the air inlet side of the modular fan faces the first side plate, and the resistive silencer is located below the modular fan in the vertical direction.

[0008] In one embodiment, each of the two cavity side plates has a ventilation opening, the two ventilation openings are arranged opposite to each other, the cavity bottom plate is located below the charging module, and the ventilation openings are close to the cavity bottom plate.

[0009] In one embodiment, the vertical distance from the lower edge of the vent opening away from the bottom plate of the cavity to the upper edge of the air inlet is L1, where L1 ≥ 100 mm.

[0010] In one embodiment, the vertical distance from the upper surface of the cavity base plate to the bottom of the charging module is L2, where L2 ≥ 200 mm.

[0011] In one embodiment, the housing includes a second side plate with the air outlet provided thereon; the air outlet is located near the bottom of the housing, and the second side plate is provided with a heat dissipation duct that connects the air outlet and the internal space of the housing. The charging pile also includes a system fan installed on the heat dissipation duct, with the air inlet side of the system fan facing the charging module and the air outlet side of the system fan facing the second side plate.

[0012] In one embodiment, the system fan includes 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 inlet side of at least one axial fan corresponding to the charging module.

[0013] In one embodiment, the straight-line distance from the wall of the heat dissipation duct where the system fan is located to the surface of the second side plate is L3, where L3 ≥ 100 mm.

[0014] In one embodiment, the vertical distance from the upper edge of the air outlet to the bottom of the system fan is L4, where L4 ≥ 200 mm.

[0015] In one embodiment, the air outlet is provided with the resistive silencer, which is disposed inside the heat dissipation duct, and the heat dissipation duct is connected to the air outlet through the ventilation opening.

[0016] In one embodiment, the resistant silencer includes a cavity bottom plate, two cavity side plates, and a cavity back plate; the cavity back plate is opposite to the inner wall of the second side plate, the two cavity side plates are respectively connected to opposite sides of the cavity back plate, and the cavity bottom plate is connected to the end of the cavity side plates and the cavity back plate away from the air inlet; the cavity side plates, the cavity back plate, and the inner walls of the second side plate together enclose the silencer cavity. Wherein, the end of the cavity bottom plate away from the second side plate is bent into the silencing cavity in the direction of the air outlet to form an arc-shaped guide part, and the arc-shaped guide part, together with the cavity back plate and the two cavity side plates, defines the ventilation opening.

[0017] The technical solution of this invention involves installing reactive silencers at the air inlet and / or outlet of the casing. This attenuates sound waves during propagation. Noise primarily propagates through air and structural vibration, with the air inlet and outlet being the main channels for air propagation. The reactive silencer operates based on the principle of acoustic filters, using abrupt changes in the pipe cross-section (such as expansion or contraction) to cause sound waves to reflect and interfere during propagation, thereby weakening the sound energy at specific frequencies and achieving a noise reduction effect. Furthermore, this solution can be further combined with sound-absorbing materials installed inside the casing to form a composite silencer of impedance and resistance. Thus, the charging pile provided by this solution can meet the heat dissipation requirements of the charging module while achieving noise reduction. Attached Figure Description

[0018] 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 the structures shown in these drawings without creative effort.

[0019] Figure 1 A cross-sectional structural schematic diagram of an embodiment of the charging pile provided by the present invention; Figure 2 for Figure 1 A cross-sectional structural diagram from another perspective; Figure 3 for Figure 1 A structural schematic diagram of an embodiment of the first and second side plates; Figure 4 A schematic diagram of an embodiment in which the resistive muffler and the charging module are arranged at a high degree of misalignment; Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure in the middle; Figure 6 This is a structural schematic diagram of one embodiment of the second side plate.

[0020] Figure 7 A schematic diagram of an embodiment in which a resistant silencer is provided for the second side plate; Figure 8 A schematic diagram of an embodiment in which an arc-shaped guide portion is formed for the bottom plate of the cavity; Figure 9 A schematic diagram of another embodiment in which the resistive muffler and the charging module are not misaligned.

[0021] Explanation of icon numbers: 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; 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; 24. Cavity bottom plate; 25. First filter screen; 26. Arc-shaped guide section; 30. Charging module; 31. Module body; 32. Module fan; 40. Heat dissipation air duct; 41. Second filter; 50. System fan; 51. Axial flow fan; 60. Sound-absorbing materials.

[0022] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0024] It should be noted that if the embodiments of the present invention 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.

[0025] Furthermore, if the embodiments of this invention 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. Thus, 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 invention.

[0026] 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.

[0027] Taking DC charging piles as an example, DC charging piles are designed for rapid energy replenishment and can provide high-power DC power to the power batteries of electric vehicles (charging to 80% capacity in 30 minutes). They are suitable for scenarios that require efficient charging, such as highways, public parking lots, and logistics centers.

[0028] Currently, the main noise reduction methods for DC charging piles are sound insulation materials and structures. Porous sound-absorbing materials (such as polyurethane foam) are pasted inside the casing to absorb high-frequency noise; or, sound insulation boards are installed between the charging module and the air outlet to block the direct propagation path of sound waves.

[0029] This invention proposes a charging pile. It mainly utilizes the abrupt change in the cross-section of a reactive silencer to reflect sound waves and consume sound energy; and can be combined with materials such as sound-absorbing materials to absorb noise in different frequency bands, thereby improving noise reduction while meeting heat dissipation requirements.

[0030] Please see Figures 1 to 9 In one embodiment of the present invention, the charging pile includes a housing 10, a charging module 30 and a resistive muffler 20. The charging module 30 is disposed inside the housing 10 and includes a module body 31 and a module fan 32 for dissipating heat from the module body 31. The housing 10 is the casing of the DC charging pile. The casing is usually an impact-resistant metal / non-metal shell to protect the internal components, while optimizing the air duct design to reduce noise.

[0031] The casing 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 AC power from the grid 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., 30kW-350kW). 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, and fault information; it supports user interaction via QR code scanning, card swiping, and command input. The billing system integrates an electricity meter, a billing module, and a payment terminal (supporting Alipay, WeChat, credit cards, etc.) to enable billing by electricity consumption or time and generate transaction records.

[0032] 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.

[0033] To reduce the noise of the charging station, a reactive silencer 20 is installed on the charging station.

[0034] Reference Figure 1 and Figure 7 In one embodiment, the resistant silencer 20 is provided at the air inlet 111.

[0035] Reference Figure 7 In one embodiment, the resistant silencer 20 is provided at the air outlet 121.

[0036] Combination Figure 1 and Figure 7 or combination Figure 8 and Figure 9 In one embodiment, the resistive silencer 20 is provided at the air outlet 121 and the air inlet 111, that is, the air inlet 111 is provided with a first resistive silencer and the air outlet 121 is provided with a second resistive silencer.

[0037] Specifically, the resistive silencer 20 has a silencer cavity 21 and a vent 211 communicating with the silencer cavity 21; wherein the area of ​​the vent 211 is smaller than the minimum cross-sectional area of ​​the silencer cavity 21 perpendicular to the airflow direction.

[0038] Specifically, the working principle of the reactive silencer 20 is based on the principle of acoustic filters. Through the design of abrupt changes in the pipe cross section (such as expansion or contraction), sound waves are reflected and interfered during propagation, thereby weakening the sound energy of specific frequencies and achieving a noise reduction effect.

[0039] 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.

[0040] In this embodiment, in order to avoid noise flowing out directly, that is, to avoid noise radiating directly through the air inlet 111 and the air outlet 121, the air inlet 111 and the air outlet 121 are offset from the charging module 30 in the height direction of the housing 10, and the air inlet 111 and the air outlet 121 are located below the charging module 30.

[0041] In other embodiments, the air inlet 111 and the air outlet 121 may also be provided for the charging module 30.

[0042] Reference Figure 1 and Figure 2 In one embodiment, the first side plate 11 and the second side plate 12 are on opposite sides of the housing 10.

[0043] In other embodiments, the first side plate 11 and the second side plate 12 are located on adjacent sides of the housing 10. For example, the two first side plates 11 and the two second side plates 12 enclose each other to form a frame structure of the housing 10. The two first side plates 11 are arranged opposite each other, and the two second side plates 12 are arranged opposite each other and adjacent to each other. The configurable scheme is that both first side plates 11 are provided with a resistive silencer 20, and one of the second side plates 12 is provided with an air outlet 121; or both second side plates 12 are provided with an air outlet 121, and one of the first side plates 11 is provided with a resistive silencer 20; or both first side plates 11 and both second side plates 12 are provided with an air inlet 111 and an air outlet 121.

[0044] Because the air outlet 121 is lower than the charging module 30, it can also reduce the noise transmission of the charging module 30 to a certain extent. In some existing solutions, a system fan 50 (such as an axial fan) is usually set to exhaust air from the air outlet 121. In order to reduce the noise of the system fan 50, an air duct is usually set and sound insulation boards and / or sound-absorbing materials 60 are set in the air duct to form an impedance silencer to reduce the noise of the system fan 50. In the reactive silencer 20 solution, the design of the air outlet 121 can also refer to the existing solution. However, in order to improve the noise reduction effect, this solution has also made improvements to the air outlet 121, as detailed below.

[0045] It should be noted that a resistive silencer is a noise reduction device that uses porous sound-absorbing materials to reduce noise. Its working principle is that sound waves propagate through the porous sound-absorbing material, converting sound energy into heat energy and dissipating it, thereby achieving a noise reduction effect. This type of silencer typically consists of sound-absorbing material fixed to the inner wall of the airflow channel or arranged in a specific way within the pipe, hence the name "resistive" silencer.

[0046] Currently, many resistive noise reduction structures use sound insulation panels. The working principle of sound insulation panels is based on the propagation characteristics of sound waves in a medium: sound waves need a medium to propagate, and the density difference of different media will affect the propagation speed and energy loss of sound waves.

[0047] When a reactive silencer 20 is installed only at the air inlet 111, an impedance silencer can be installed at the air outlet 121, referring to the existing scheme. It is important to distinguish that a pure reactive silencer (such as an expansion chamber) relies solely on the reflection / interference of abrupt changes in the duct cross-section to attenuate a specific frequency band (especially low frequencies) and does not depend on absorbent material, while an impedance silencer requires absorbent material.

[0048] The technical solution of this invention involves installing reactive silencers 20 at the air inlet 111 and air outlet 121 of the housing 10, thereby attenuating sound waves during propagation. Noise mainly propagates through air and structural vibration. The air inlet and outlet (111, 121) are the main channels for air propagation. The working principle of the reactive silencer 20 is based on the principle of acoustic filters. Through the design of abrupt changes in the pipe cross-section (such as expansion or contraction), sound waves are reflected and interfered during propagation, thereby weakening the sound energy of specific frequencies and achieving a noise reduction effect. Furthermore, it can be combined with sound-absorbing material 60 to form a composite silencer of impedance + resistance. In this way, the air inlet 111 and air outlet 121 can meet the heat dissipation requirements of the charging module 30 while achieving a noise reduction effect.

[0049] Reference Figure 1 and Figure 5 In this embodiment, the resistive silencer 20 forms an expansion chamber structure, which forces airflow and sound waves to pass through the silencer cavity 21 before they can flow out of the shell 10 to the outside. The sound waves are repeatedly reflected in the silencer cavity 21, and the energy is consumed. Compared with the current noise reduction scheme that relies on sound-absorbing materials, noise reduction can be achieved by using only metal or plastic structures, avoiding performance degradation caused by aging and dust accumulation of the sound-absorbing material 60. It is suitable for harsh outdoor environments (such as rain, snow, and high temperature) and will not fail due to moisture like the porous sound-absorbing material 60.

[0050] Reference Figure 5Specifically, the total area of ​​the vent 211 is S1, and the minimum cross-sectional area of ​​the silencer 21 perpendicular to the airflow direction along its axis is S2, where 2.5S1≤S2≤5S1. Reactive silencers 20 typically reflect sound waves through cross-sectional changes, especially expansion chamber silencers. The area ratio affects the silencing effect and airflow resistance. A larger S2 / S1 ratio can enhance low-frequency silencing, but an excessively large ratio increases duct size and cost, and may also cause airflow separation, increasing turbulent noise. Conversely, a ratio that is too small results in insufficient silencing and increased airflow velocity, leading to wind noise and pressure drop. Therefore, a balance needs to be struck between silencing performance and heat dissipation efficiency to ensure effective noise reduction without compromising heat dissipation.

[0051] The modular fan 32 needs to maintain a certain airflow velocity (e.g., 2~4 m / s) to cool the charging module 30. If S2 / S1 is too large, the inlet velocity of the air duct will be too low, which may cause airflow backflow or local overheating; if S2 / S1 is too small, the inlet velocity will be too high, which will generate wind shear noise. In addition, the thickness of the charging pile shell 10 is limited. An excessively large area ratio may exceed the installation space of the shell 10 and require more complex sheet metal forming processes (such as multi-stage expansion), increasing production costs.

[0052] It should be noted that the units of S1 and S2 must be consistent, and the projected area of ​​internal guide vanes, reinforcing ribs and other structures must be excluded during measurement.

[0053] Ventilation opening 211 refers to the connection between the air duct of the resistive silencer 20 and the internal space of the casing (i.e., the opening at the end of the air duct leading to the interior of the casing 10).

[0054] The total area S1 of the vent 211 includes the following cases: If the opening is a single hole (such as a circle or rectangle), S1 is the geometric area of ​​the hole. If the opening is a multi-hole or branched structure (such as a honeycomb grid or multiple scattered small holes), S1 is the sum of the effective ventilation areas of all through holes (excluding the projected area of ​​the obstruction structure), that is, S1 is the effective flow area of ​​airflow from the silencer duct into the housing.

[0055] Measurement methods for S1 and S2.

[0056] If S1 and S2 are regular cross sections (rectangular, circular, etc.): S1 can be calculated directly using geometric formulas (such as measuring the length and width of a rectangle, or measuring the diameter of a circle).

[0057] S2 is the geometric area of ​​the throat (minimum cross-sectional area) of the air duct, which needs to be measured perpendicular to the airflow direction.

[0058] If S1 and S2 are irregular cross-sections (such as trapezoids, polygons, or irregular curves): One method is to cover the cross-sectional surface with standard grid paper and estimate the area by counting the effective grids. Alternatively, the cross-sectional profile can be imported into industrial design software, and an area calculation tool can be used to automatically generate accurate area values.

[0059] There are several possible locations for the ventilation opening 211. Specifically, the reactive silencer 20 includes a cavity bottom plate 24, two cavity side plates 23, and a cavity back plate 22. The two cavity side plates 23, the cavity back plate 22, and the cavity bottom plate 24, together with the inner wall of the housing 10, form a silencing cavity 21. The cavity bottom plate 24 is connected to the end of the cavity side plates 23 and the cavity back plate 22 away from the air inlet 111, and the cavity back plate 22 is opposite to the inner wall of the housing 10. Ventilation openings 211 are provided on both cavity side plates 23; or ventilation openings 211 are provided on at least one cavity side plate 23 and the cavity back plate 22; or at least one ventilation opening 211 is provided on the cavity back plate 22.

[0060] In this embodiment, each of the two cavity side plates 23 has a ventilation opening 211, the two ventilation openings 211 are arranged opposite to each other, the cavity bottom plate 24 is located below the power module, and the ventilation openings 211 are close to the cavity bottom plate 24.

[0061] 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 inlet 111. The straight edge section 221 and the first side plate 11 are opposite to each other and form part of the silencing cavity 21. The straight edge section 221 and the beveled edge section 222 intersect at an angle. The cavity bottom plate 24 is located below the module fan 32 in the vertical direction.

[0062] The charging module 30 and the module fan 32 are located above the air inlet 111, which is at the bottom. The airflow needs to flow upward to remove heat. The vent 211 is close to the bottom plate 24 of the cavity, which allows cool air to flow more effectively through the power module and improves the heat dissipation effect.

[0063] Two opposing vents 211 form symmetrical sound sources. The sound waves entering the silencer cavity 21 from the two opposing vents 211 generate destructive interference during propagation, canceling out some of the energy. In addition, the two opposing vents 211, while satisfying the area ratio of the reactive silencer 20, can maintain an appropriate air velocity, avoiding excessively high air velocity that generates noise or excessively low air velocity that affects heat dissipation, ensuring sufficient noise reduction without affecting airflow.

[0064] Ventilation 211 is close to the cavity bottom plate 24, which is located below the charging module 30 and the module fan 32. The cavity bottom plate 24 closes the bottom of the air duct, forcing the sound waves to detour from the side to the ventilation 211. The extended path increases the attenuation of low and medium frequency noise (such as transformer vibration).

[0065] The area of ​​the silencing cavity 21 decreases abruptly at the vent 211, the airflow is accelerated when it enters the air duct, and the noise is reflected multiple times when it enters, so that the energy is gradually dissipated and reduced. In this way, the optimization of multiple objectives such as heat dissipation efficiency and noise suppression is achieved.

[0066] Reference Figure 1 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 vent 211 away from the bottom plate 24 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 vent 211, 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.

[0067] The vertical distance from the upper surface of the cavity base plate 24 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.

[0068] The upper limit of L1 is constrained by the total height of housing 11. The upper limit of L1 = (total height of housing 11) - (height of charging module 30 L2).

[0069] Measurements of L1 and L2.

[0070] 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 vent 211 is the highest point of the bottom edge of the opening away from the bottom plate.

[0071] 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.

[0072] Specifically, the silencing cavity 21 is also equipped with a first filter 25. This can prevent dust or debris from directly entering the ventilation port 211, 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 machine is not running.

[0073] Furthermore, referring to Figure 1 , Figure 2 and Figure 4 The first side plate 11 is also provided with a first sound-absorbing area 112, and a sound-absorbing material 60 is arranged on the first sound-absorbing area 112. The first sound-absorbing area 112 corresponds to the module fan 32.

[0074] 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 60 of the first sound-absorbing area 112. The first sound-absorbing area 112 is rectangular. In one embodiment, the sound-absorbing material 60 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.

[0075] 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.

[0076] Specifically, to improve the noise absorption effect of the sound-absorbing cotton, the first sound-absorbing area 112 is located above the resistive silencer 20 on the first side plate 11, and the sound-absorbing area extends to the top edge of the resistive silencer 20. In other embodiments, it may also be disposed within the silencing cavity 21; or disposed on other side plates of the housing 10.

[0077] Understandably, the same reactive silencer 20 can be installed at both the air inlet 111 and the air outlet 121; the following describes a scheme in which the aforementioned reactive silencer 20 is installed at the air inlet 111, and a heat dissipation duct 40 is installed at the air outlet 121.

[0078] Specifically, the housing 10 includes a second side plate 12 with an air outlet 121; the air outlet 121 is near the bottom of the housing 10, and the second side plate 12 is provided with a heat dissipation duct 40, which connects the air outlet 121 and the internal space of the housing 10; a system fan 50 is mounted on the heat dissipation duct 40, with the air inlet side of the system fan 50 facing the charging module 30 and the air outlet side of the system fan 50 facing the second side plate 12. The heat dissipation duct 40 connects to the air outlet 121 and extends to the top of the second side plate 12. In this embodiment, the system fan 50 consists of multiple axial fans 51 disposed on the heat dissipation duct 40. The multiple axial fans 51 are arranged at intervals along the height direction of the second side plate 12. The air inlet side of at least one axial fan 51 corresponds to the charging module 30, and the air outlet side of the axial fan 51 faces the second side plate 12.

[0079] Normally, hot air rises naturally. Extending the heat dissipation duct 40 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 40 to the top lengthens the airflow path and 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 intake side of the fan at it, the hot air around the module can be directly drawn in, improving the heat dissipation efficiency.

[0080] The arrangement of aligning the exhaust side of the axial fan 51 directly with the second side plate 12 is related to airflow guidance and noise control. This alignment encourages airflow along the side plate, reducing turbulence and wind shear noise. Furthermore, this arrangement creates back pressure, optimizing fan efficiency, guiding airflow outwards, and preventing backflow.

[0081] The specific number of axial fans 51 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.

[0082] Reference Figure 1 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 40 where the axial fan 51 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.

[0083] The maximum size of L3 is limited by the size of housing 10 and the distance between the power modules.

[0084] Specifically, the distance from the upper edge of the air outlet 121 to the bottom of the nearest axial fan 51 is L4, and L4 ≥ 200mm. Due to the height constraint of the whole machine, the airflow will have more opportunities to interact with the sound-absorbing structure (such as the sound-absorbing material 60 and the shape of the air duct) in the longer path, thus attenuating the noise (such as setting the sound-absorbing material 60 on the second side plate 12 to further absorb the noise generated by the fan).

[0085] Regarding the measurement of L3, a point is taken on the inner wall of the heat dissipation duct 40, 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 40).

[0086] Regarding the measurement of L4, the distance is measured at the vertical projection position of the bottom of the nearest axial fan 51 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).

[0087] The second side plate 12 is also provided with a second sound-absorbing area 122, which corresponds to the axial fan 51. The second sound-absorbing area 122 is provided with sound-absorbing material 60. In one embodiment, the sound-absorbing material 60 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.

[0088] 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.

[0089] Combination Figure 6 Specifically, a second filter 41 is also provided inside the heat dissipation duct 40, located below the axial fan 51. 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 41 can prevent 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.

[0090] Based on the cooling air duct 40 set at the air outlet 121, the above-mentioned anti-muffler 20 structure can also be set in the cooling air duct 40. After the hot air is blown into the cooling air duct 40 by the axial fan 51, the air resistance can be increased and the noise of the axial fan 51 can be reduced because it is directly opposite the second side plate 12. Furthermore, the sound-absorbing material 60 of the second sound-absorbing area 122 can further reduce the noise.

[0091] Combination Figure 7 On this basis, a reactive silencer 20 is further installed, and hot air enters the silencer cavity 21 from the vents on both sides, which further attenuates the noise and can effectively reduce the noise from the transmission path.

[0092] Reference Figure 8 In order to reduce the resistance of the cavity bottom plate 24 in the heat dissipation duct 40, specifically, the end of the cavity bottom plate 24 away from the second side plate 12 is bent inward towards the air outlet 121 to form an arc-shaped guide part 26. The arc-shaped guide part 26, the cavity back plate 22, and the two cavity side plates 23 define the ventilation opening 211. The arc-shaped guide part 26 guides the airflow flowing in the heat dissipation duct 40 to generate the Coanda effect on the arc-shaped guide part 26.

[0093] The Coanda effect refers to the phenomenon that fluids adhere to convex curved surfaces and flow. This can be used to control the direction of airflow, reduce separation and turbulence, thereby reducing noise and pressure loss.

[0094] The principle is that when the airflow flows through the convex surface of the arc-shaped guide 26 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.

[0095] The arc-shaped guide section 26 can be formed by bending the cavity bottom plate 24, so that the cavity bottom plate 24 forms a curved surface on the surface facing the heat dissipation air duct 40 away from the second side plate 12. Common shapes of the curved surface include curved arc, tapered or expanded streamlined structure, or guide plate with a specific angle.

[0096] In other words, the cross-section of the cavity bottom plate 24 in the height direction of the shell 10 is formed as an airfoil section, a circular arc section, a tapered arc section, or an S-shaped hyperbolic section, etc.

[0097] In the above-described scheme, the resistive silencer 20 is positioned vertically below the modular fan 32. Combined with... Figure 9 The resistive silencer 20 can also be configured in other ways.

[0098] Specifically, in this embodiment, the silencing cavity 21 extends from the first side plate 11 to the charging module 30, the vent 211 is at a similar height to the charging module 30, and the air inlet side of the module fan 32 of the charging module 30 is provided corresponding to the vent 211; in addition, a filter or grille can be further provided in the vent 211. Alternatively, porous sound insulation material can be provided in the vent 211.

[0099] This makes the area of ​​the vent 211 smaller than the minimum cross-sectional area of ​​the anechoic chamber 21 perpendicular to the airflow direction. The smaller area of ​​the vent 211 than the minimum cross-sectional area of ​​the anechoic chamber 21 enhances the impedance change, thereby more effectively attenuating noise of a specific frequency.

[0100] Because the anechoic cavity 21 is longer in the direction of airflow (that is, the sound wave reflection path is extended), the sound wave can be attenuated after more reflections in the anechoic cavity 21; and the sound-absorbing material 60 lining (such as a micro-perforated plate or sound-absorbing cotton) can be provided on the first side plate 11 to further attenuate the sound wave energy.

[0101] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A charging pile, characterized in that, include: The housing has an air inlet and an air outlet on its periphery; A charging module is disposed within the housing, the charging module comprising a module body and a module fan for dissipating heat from the module body; as well as A reactive silencer is provided at the air inlet and the air outlet. The reactive silencer has a silencer cavity and a vent communicating with the silencer cavity. The area of ​​the vent is smaller than the minimum cross-sectional area of ​​the silencer cavity in the direction perpendicular to its axis. The air inlet is equipped with a first resistive silencer, which includes a cavity bottom plate, two cavity side plates and a cavity back plate; The cavity back plate is opposite to the inner wall of the shell, the two cavity side plates are respectively connected to the opposite sides of the cavity back plate, and the cavity bottom plate is connected to the cavity side plate and the cavity back plate at the end away from the air inlet. The cavity side plate, cavity back plate and cavity bottom plate together with the inner wall of the shell form the sound-absorbing cavity. Each of the two cavity side plates has a ventilation opening, the two ventilation openings are arranged opposite to each other, the cavity bottom plate is located below the charging module, and the ventilation openings are close to the cavity bottom plate; The housing includes a second side plate with the air outlet; the air outlet is near the bottom of the housing, and the second side plate is provided with a heat dissipation duct, which connects the air outlet and the internal space of the housing; the charging pile also includes a system fan installed on the heat dissipation duct, with the air inlet side of the system fan facing the charging module and the air outlet side of the system fan facing the second side plate. The air outlet is equipped with a second resistance silencer, which is located inside the heat dissipation duct. The heat dissipation duct is connected to the air outlet through the ventilation opening. The second reactive silencer includes a cavity bottom plate, two cavity side plates, and a cavity back plate; The inner walls of the cavity back plate and the second side plate are opposite to each other. The two cavity side plates are respectively connected to the opposite sides of the cavity back plate. The cavity bottom plate is connected to the cavity side plate and the cavity back plate at the end away from the air outlet. The cavity side plate, the cavity back plate and the inner walls of the second side plate together enclose the sound-absorbing cavity. Wherein, the end of the cavity bottom plate away from the second side plate is bent into the silencing cavity in the direction of the air outlet to form an arc-shaped guide part, and the arc-shaped guide part, together with the cavity back plate and the two cavity side plates, defines the ventilation opening.

2. The charging pile as described in claim 1, characterized in that, The area of ​​the ventilation opening is S1, and the minimum cross-sectional area of ​​the silencing cavity in the direction perpendicular to its axis is S2, wherein 2.5S1≤S2≤5S1.

3. The charging pile as described in claim 1, characterized in that, The vertical distance from the lower edge of the vent opening away from the bottom plate of the cavity to the upper edge of the air inlet is L1, where L1 ≥ 100 mm. And / or, the vertical distance from the upper surface of the cavity bottom plate to the bottom of the charging module is L2, where L2 ≥ 200 mm.

4. The charging pile as described in claim 1, characterized in that, The housing includes a first side plate with the air inlet; the air inlet is close to the bottom of the housing, the first resistive silencer is disposed on the first side plate, the air inlet side of the modular fan faces the first side plate, and the first resistive silencer is located below the modular fan in the vertical direction.

5. The charging pile as described in claim 1, characterized in that, The system fan includes multiple axial fans disposed 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 inlet side of at least one axial fan corresponds to the charging module. And / or, the straight-line distance from the wall of the heat dissipation duct where the system fan is located to the surface of the second side plate is L3, where L3 ≥ 100 mm; And / or, the vertical distance from the upper edge of the air outlet to the bottom of the system fan is L4, where L4 ≥ 200 mm; And / or, the second side panel is further provided with a second sound-absorbing area, the second sound-absorbing area corresponding to the system fan, and the second sound-absorbing area is provided with sound-absorbing material.

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