Charging pile

Abstract

The invention discloses a charging pile, and relates to the technical field of charging piles, the charging pile comprises a shell, a charging module and a reactive silencer, and the peripheral side of the shell is provided with an air inlet and an air outlet; the charging module comprises a module body and a module fan used for cooling the module body. The reactive muffler is arranged at the air inlet and / or the air outlet, and the reactive muffler is provided with a muffling cavity and a ventilation opening communicated with the muffling cavity; the area of the ventilation opening is smaller than the minimum cross sectional area, perpendicular to the axis direction, of the silencing cavity. According to the technical scheme provided by the invention, the reactive silencer is arranged on the noise propagation path, so that the noise is effectively reduced, and the heat dissipation requirement of the charging pile can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a charging pile. Background Art

[0002] The current 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 make the noise during the operation of the charging piles meet the quiet requirements of most scenarios. Summary of the Invention

[0003] The main purpose of the present invention is to propose a charging pile, which aims to use the sudden change of the cross-section of the resistive silencer to reflect sound waves and consume sound energy; and can be combined with sound-absorbing materials to absorb noise in different frequency bands, thereby improving the noise reduction effect while meeting the heat dissipation performance.

[0004] To achieve the above-mentioned purpose, the charging pile proposed by the present invention includes:

[0005] A shell, wherein the circumferential sides of the shell are respectively provided with an air inlet and an air outlet;

[0006] a charging module disposed in the housing, the charging module comprising a module body and a module fan for dissipating heat from the module body; and

[0007] A reactive muffler is provided at the air inlet and / or the air outlet, and has a muffler cavity and a vent communicating with the muffler cavity; wherein the area of the vent is smaller than the minimum cross-sectional area of the muffler cavity in a direction perpendicular to its axis.

[0008] In one embodiment, the area of the ventilation opening is S1, and the minimum cross-sectional area of the muffler cavity in a direction perpendicular to its axis is S2, wherein 2.5S2≤S1≤5S2.

[0009] In one embodiment, the reactive muffler includes a cavity bottom plate, two cavity side plates, and a cavity back plate;

[0010] 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, the cavity bottom plate is connected to the cavity side plates and the end of the cavity back plate away from the air inlet, and the cavity side plates, cavity back plate and cavity bottom plate and the inner wall of the shell together enclose the muffler cavity;

[0011] Wherein, the ventilation openings are provided on both of the cavity side panels; or the ventilation openings are provided on at least one of the cavity side panels and the cavity back panel; or at least one of the ventilation openings is provided on the cavity back panel.

[0012] In one embodiment, the shell includes a first side panel on which the air inlet is opened; the air inlet is close to the bottom of the shell, the resistive silencer is arranged on the first side panel, the air inlet side of the modular fan faces the first side panel, and the resistive silencer is located below the modular fan in the vertical direction.

[0013] In one embodiment, each of the two cavity side panels is provided with a vent, the two vents are arranged opposite to each other, the cavity bottom plate is located below the charging module, and the vent is close to the cavity bottom plate.

[0014] In one embodiment, a vertical distance from a lower edge of the opening of the vent away from the cavity bottom plate to an upper edge of the air inlet is L1, and L1 is ≥ 100 mm.

[0015] In one embodiment, a vertical distance from the upper surface of the cavity bottom plate to the bottom of the charging module is L2, and L2 is ≥ 200 mm.

[0016] In one embodiment, the housing includes a second side panel having the air outlet; the air outlet is close to the bottom of the housing, and the second side panel is provided with a heat dissipation duct, which connects the air outlet and the interior space of the housing;

[0017] The charging pile further includes a system fan arranged on the heat dissipation air duct, wherein the air inlet side of the system fan faces the charging module, and the air outlet side of the system fan faces the second side plate.

[0018] In one embodiment, the system fan includes a plurality of axial fans provided on the heat dissipation duct, the plurality of 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.

[0019] In one embodiment, a straight-line distance from a wall surface of the heat dissipation duct where the system fan is located to a plate surface of the second side plate is L3, and L3 is ≥ 100 mm.

[0020] In one embodiment, a vertical distance from an upper edge of the air outlet to a bottom of the system fan is L4, and L4 is ≥ 200 mm.

[0021] In one embodiment, the air outlet is provided with the reactive muffler, and the reactive muffler is provided in the heat dissipation duct, and the heat dissipation duct is connected with the air outlet through the vent.

[0022] In one embodiment, the reactive muffler 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, the cavity bottom plate is connected to the cavity side plates and the end of the cavity back plate away from the air inlet, and the cavity side plates, the cavity back plate and the inner wall of the second side plate together enclose the muffler cavity;

[0023] Among them, one end of the cavity bottom plate away from the second side plate is bent toward the air outlet and into the muffler cavity to form an arc guide portion, and the arc guide portion and the cavity back plate and two cavity side plates define the ventilation port.

[0024] The technical solution of the present invention is to set a resistive silencer at the air inlet and / or air outlet of the shell, so that the sound waves are attenuated during the propagation process. The noise is mainly transmitted through air and structural vibration. The air inlet and outlet are the main channels for air propagation. The working principle of the resistive silencer is based on the principle of acoustic filter. Through the design of sudden changes in the pipe cross-section (such as expansion or contraction), the sound waves are reflected and interfered during the propagation process, thereby weakening the sound energy of a specific frequency to achieve the sound elimination effect; and this solution can be further combined with the sound-absorbing material arranged in the shell to form an impedance + resistance composite silencer; in this way, the charging pile provided by this solution can meet the heat dissipation requirements of the charging module, and at the same time can achieve the effect of sound elimination and noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 A schematic cross-sectional view of an embodiment of a charging pile provided by the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of a cross-sectional structure from another perspective;

[0028] Figure 3 for Figure 1 A schematic structural diagram of an embodiment of the first side panel and the second side panel;

[0029] Figure 4 A schematic structural diagram of an embodiment in which a reactive muffler and a charging module are arranged at a height offset;

[0030] Figure 5 for Figure 4Schematic diagram of the cross-section structure in ;

[0031] Figure 6 Schematic diagram of the structure of an embodiment of the second side plate.

[0032] Figure 7 A schematic structural diagram of an embodiment of providing a reactive muffler for the second side plate;

[0033] Figure 8 A structural diagram of an embodiment of forming an arc-shaped guide portion on the cavity bottom plate;

[0034] Figure 9 A structural diagram of another embodiment in which the reactive muffler and the charging module are arranged in a non-offset manner.

[0035] Description of Figure Numbers:

[0036] 10. Housing; 11. First side panel; 111. Air inlet; 12. Second side panel; 121. Air outlet; 112. First sound absorption zone; 122. Second sound absorption zone;

[0037] 20. Resistant muffler; 21. Muffler chamber; 211. Ventilation port; 22. Chamber back panel; 221. Straight edge section; 222. Bevel edge section; 23. Chamber side panel; 24. Chamber bottom panel; 25. First filter screen; 26. Arc-shaped guide portion;

[0038] 30. Charging module; 31. Module body; 32. Module fan;

[0039] 40. Cooling air duct; 41. Second filter;

[0040] 50. System fan; 51. Axial flow fan;

[0041] 60. Sound-absorbing materials.

[0042] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] The current 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 make the noise during the operation of the charging piles meet the quiet requirements of most scenarios.

[0047] Taking DC charging piles as an example, DC charging piles are designed for fast energy replenishment and can provide high-power DC power to electric vehicle power batteries (charge to 80% in 30 minutes). They are suitable for scenarios that require efficient charging, such as highways, public parking lots, and logistics centers.

[0048] 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 panels are set between the charging module and the air outlet to block the direct propagation path of sound waves.

[0049] The present invention proposes a charging pile that primarily utilizes the sudden change in the cross-section of a reactive muffler to reflect sound waves and dissipate sound energy. Furthermore, the muffler can be combined with sound-absorbing materials to absorb noise at different frequencies, thereby enhancing the noise reduction effect while maintaining heat dissipation performance.

[0050] See also Figures 1 to 9 In one embodiment of the present invention, the charging pile includes a housing 10, a charging module 30, and a reactive muffler 20. The charging module 30 is disposed in the housing 10. The charging module 30 includes a module body 31 and a module fan 32 for dissipating heat from the module body 31.

[0051] The housing 10 is also the casing of the DC charging pile. The casing is usually an impact-resistant metal / non-metal shell that protects internal components and optimizes the air duct design to reduce noise.

[0052] The housing houses a charging module 30, a main controller, a human-machine interface (HMI), a billing system, a cooling system, safety devices, a charging gun, and cables. The charging module 30 converts alternating current (AC) from the power grid into high-voltage direct current (DC) to directly charge the electric vehicle's power battery. It typically consists of multiple power units connected in parallel, supporting high-power output (e.g., 30kW-350kW). The main controller coordinates the charging process, monitors the status of the charging station (voltage, current, temperature, etc.), and communicates with the vehicle's BMS (battery management system) to ensure charging safety and efficiency. The HMI includes a touchscreen or button-operated panel that displays charging status, fees, and fault information; it supports user interactions such as scanning codes, swiping cards, and entering commands. The billing system integrates an electric meter, a billing module, and a payment terminal (supporting Alipay, WeChat, credit cards, etc.) to enable billing based on power consumption or time, and generates transaction records.

[0053] DC charging piles generate significant heat when operating at high power. The cooling system uses fans, heat sinks, or liquid cooling devices to cool heat-generating components such as the charging module 30 and cables, ensuring stable operation. Safety protection devices include leakage protection, overvoltage / overcurrent protection, an emergency stop button, and a lightning protection device to prevent electrical accidents and personal injury. The charging gun includes a high-power DC charging interface (such as CCS, CHAdeMO, and GB / T standards) with a built-in temperature sensor and electronic lock to ensure connection reliability and charging safety.

[0054] In order to reduce the noise of the charging pile, a reactive muffler 20 is provided at the charging pile.

[0055] Reference Figure 1 and Figure 7 In one embodiment, the reactive muffler 20 is disposed at the air inlet 111 .

[0056] Reference Figure 7 In one embodiment, the reactive muffler 20 is disposed at the air outlet 121 .

[0057] Combine Figure 1 and Figure 7 or combined Figure 8 and Figure 9 In one embodiment, the reactive muffler 20 is disposed at the air outlet 121 and the air inlet 111 .

[0058] Specifically, the reactive muffler 20 has a muffler cavity 21 and a vent 211 communicating with the muffler cavity 21 ; wherein the area of the vent 211 is smaller than the minimum cross-sectional area of the muffler cavity 21 perpendicular to the airflow direction.

[0059] Specifically, the working principle of the reactive silencer 20 is based on the principle of acoustic filter. Through the design of sudden changes in the pipe cross-section (such as expansion or contraction), the sound waves are reflected and interfered during the propagation process, thereby weakening the sound energy of a specific frequency and achieving a sound elimination effect.

[0060] Air enters the housing 10 from the air inlet 111 to dissipate heat for the charging module 30 and is then discharged from the air outlet 121 to cool heating components such as the charging module 30 and cables, thereby ensuring stable operation of the device.

[0061] In this embodiment, in order to prevent the noise from flowing out directly, that is, to prevent the noise from being radiated directly through the air inlet 111 and the air outlet 121, the air inlet 111 and the air outlet 121 are staggered with the charging module 30 in the height direction of the shell 10, and the air inlet 111 and the air outlet 121 are located below the charging module 30.

[0062] In other embodiments, the air inlet 111 and the air outlet 121 may also be disposed corresponding to the charging module 30 .

[0063] 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 .

[0064] In other embodiments, the first side panel 11 and the second side panel 12 are on adjacent sides of the shell 10, for example, the two first side panels 11 and the two second side panels 12 enclose a frame structure of the shell 10, the two first side panels 11 are arranged opposite to each other, the two second side panels 12 are arranged opposite to each other, and the first side panel 11 and the second side panel 12 are arranged adjacent to each other, wherein the configurable scheme is that both first side panels 11 are provided with a resistant silencer 20, and one of the second side panels 12 is provided with an air outlet 121; or the two second side panels 12 are provided with an air outlet 121, and one of the first side panels 11 is provided with a resistant silencer 20; or the two first side panels 11 and the two second side panels 12 are provided with an air inlet 111 and an air outlet 121.

[0065] Because the air outlet 121 is lower than the charging module 30, it can also reduce the noise transmitted by the charging module 30 to a certain extent. In some existing solutions, a system fan 50 (such as an axial flow fan) is usually provided to discharge air from the air outlet 121. To reduce the noise of the system fan 50, an air duct is usually provided, and a sound insulation board and / or sound-absorbing material 60 are provided in the air duct to form an impedance muffler to reduce the noise of the system fan 50. In the solution of the resistive muffler 20, the design of the air outlet 121 can also refer to the existing solution. However, to improve the noise reduction effect, this solution also makes improvements to the air outlet 121, as described below.

[0066] It should be noted that a resistive muffler is a type of noise reduction device that uses porous sound-absorbing materials to reduce noise. Its operating principle is to convert sound energy into heat energy through the propagation of sound waves through the porous sound-absorbing material, which is then dissipated, thereby achieving the noise reduction effect. This type of muffler is usually composed of sound-absorbing materials fixed to the inner wall of the airflow channel or arranged in a certain pattern within the pipe, hence the name "resistive" muffler.

[0067] Currently, many resistive sound-absorbing structures are implemented using sound insulation panels. The working principle of sound insulation panels is based on the propagation characteristics of sound waves in a medium: sound waves require a medium to propagate, and the density differences between different media will affect the propagation speed and energy loss of sound waves.

[0068] When only the reactive muffler 20 is installed at the air inlet 111, an impedance muffler can be installed at the air outlet 121 in accordance with existing solutions. It should be noted that pure reactive mufflers (such as expansion chambers) rely solely on reflection / interference caused by sudden changes in the pipe cross-section to attenuate specific frequency bands (especially low frequencies) and do not rely on the absorber material, while impedance mufflers do rely on the absorber material.

[0069] The technical solution of the present invention is to set the air inlet 111 and the air outlet 121 of the shell 10 with a resistive silencer 20, so that the sound waves are attenuated during the propagation process. Noise is mainly transmitted through air and structural vibration. The air inlet and outlet (111, 121) are the main channels for air propagation. The working principle of the resistive silencer 20 is based on the principle of acoustic filter. Through the design of sudden changes in the pipe cross section (such as expansion or contraction), the sound waves are reflected and interfered during the propagation process, thereby weakening the sound energy of a specific frequency and achieving a sound elimination effect. It can also be further combined with the sound-absorbing material 60 to form an impedance + resistance composite silencer; in this way, the air inlet 111 and the air outlet 121 can meet the heat dissipation requirements of the charging module 30 and achieve a sound elimination effect.

[0070] Reference Figure 1 and Figure 5 In this embodiment, the resistant silencer 20 forms an expansion chamber structure, forcing the airflow and sound waves to pass through the silencer cavity 21 before flowing out of the shell 10 to the outside world. The sound waves are repeatedly reflected in the silencer cavity 21, and the energy is consumed. Compared with the current noise reduction solution that relies on absorbing materials, noise reduction can be achieved only through metal or plastic structures, avoiding the 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.

[0071] Reference Figure 5Specifically, the total area of the vent 211 is S1, and the minimum cross-sectional area of the silencer cavity 21 in its axial direction, perpendicular to the direction of airflow flow, is S2, wherein 2.5S2≤S1≤5S2. The reactive silencer 20 usually reflects sound waves by changing the cross section, especially the expansion chamber silencer. The area ratio will affect the silencer effect and airflow resistance. A larger S1 / S2 ratio can enhance the low-frequency silencer effect, but a too large ratio will increase the size and cost of the air duct, and may cause airflow separation and increase turbulent noise. If the ratio is too small, the silencer effect is insufficient, and the airflow velocity increases, resulting in wind noise and pressure loss. Therefore, it is necessary to balance the silencer performance and heat dissipation efficiency to ensure that the heat dissipation is not affected while effectively reducing the noise.

[0072] The module fan 32 must maintain a certain wind speed (e.g., 2-4 m / s) to cool the charging module 30. If the ratio S1 / S2 is too large, the airflow velocity at the air duct inlet will be too low, potentially causing backflow or localized overheating. If S1 / S2 is too small, the inlet velocity will be too high, generating wind shear noise. Furthermore, the thickness of the charging pile housing 10 is limited. A larger area ratio than the corresponding expansion chamber depth may exceed the installation space of the housing 10 and require more complex sheet metal forming processes (e.g., multi-stage expansion), increasing production costs.

[0073] It should be noted that the units of S1 and S2 must be consistent, and the projected area of internal guide plates, reinforcement ribs and other structures must be excluded during measurement.

[0074] The vent 211 refers to a connection port between the air duct of the reactive muffler 20 and the interior space of the housing (ie, an opening where the end of the air duct leads to the interior of the housing 10 ).

[0075] The total area S1 of the ventilation opening 211 includes the following situations: 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 bifurcated 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 obstructing structure). In other words, S1 is the effective flow area of air from the muffler air duct into the interior of the housing.

[0076] About the measurement method of S1 and S2.

[0077] If S1 and S2 are regular cross-sections (rectangular, circular, etc.):

[0078] S1 can be directly calculated using geometric formulas (e.g., length and width for rectangles, and diameter for circles).

[0079] S2 is the geometric area of the duct throat (minimum cross-sectional area) and must be measured perpendicular to the airflow direction.

[0080] If S1 and S2 are irregular cross-sections (e.g., trapezoidal, polygonal, or irregularly curved): One method is to cover the cross-section surface with standard grid paper and estimate the area by counting the number of valid grid cells. Alternatively, import the cross-section profile into industrial design software and use area calculation tools to automatically generate accurate area values.

[0081] There are many possible locations for the vent 211. Specifically, the reactive muffler 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, the cavity bottom plate 24, and the inner wall of the shell 10 enclose a muffler 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 shell 10. The vent 211 is provided on both cavity side plates 23; or at least one cavity side plate 23 and cavity back plate 22 is provided with a vent 211; or at least one vent 211 is provided on the cavity back plate 22.

[0082] In this embodiment, each of the two cavity side plates 23 defines a vent 211 . The two vents 211 are disposed opposite to each other. The cavity bottom plate 24 is located below the power module, and the vent 211 is close to the cavity bottom plate 24 .

[0083] The cavity back panel 22 includes a straight edge section 221 and a bevel section 222. The bevel section 222 is connected to the lower edge of the air inlet 111. The straight edge section 221 and the first side panel 11 constitute part of the silencer cavity 21. The straight edge section 221 and the bevel section 222 intersect at an angle, and the cavity bottom plate 24 is located below the module fan 32 in the vertical direction.

[0084] The charging module 30 and module fan 32 are located above the air inlet 111. The air inlet 111 is at the bottom, and airflow needs to flow upward to remove heat. The vent 211 is located near the cavity floor 24, allowing cool air to flow more efficiently through the power module, improving heat dissipation.

[0085] The two opposing vents 211 form a symmetrical sound source. Sound waves entering the muffler chamber 21 through the two opposing vents 211 produce destructive interference during propagation, canceling out some of their energy. Furthermore, the two opposing vents 211 maintain appropriate air velocity while meeting the area ratio of the reactive muffler 20, avoiding excessively high flow rates that generate noise or excessively low flow rates that affect heat dissipation, ensuring sufficient sound attenuation without compromising airflow.

[0086] The vent 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 vent 211. The extended path increases the attenuation of medium and low frequency noise (such as transformer vibration).

[0087] The area of the silencer cavity 21 suddenly decreases at the vent 211, the airflow is accelerated when entering the air duct, the noise is reflected multiple times when entering, and the energy is gradually dissipated and reduced, thus achieving multi-objective optimization of heat dissipation efficiency and noise suppression.

[0088] Reference Figure 1 Charging piles usually have certain size specifications. Under the same specifications, the size of the air inlet 111 is usually 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 cavity bottom plate 24 to the upper edge of the air outlet of the air inlet 111 is L1, and 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 heat dissipation of the power module. L1 provides distance attenuation for sound wave propagation, reducing noise (such as fan whistling, etc.) from leaking out through the air inlet 111.

[0089] The vertical distance from the upper surface of the cavity floor 24 to the bottom of the charging module 30 is L2, which is ≥ 200 mm. L2 provides a space for mechanical vibration attenuation, reducing the structural vibration transmitted from the floor to the module and improving the noise reduction effect.

[0090] The upper limit of L1 is constrained by the total height of the housing 11 , and the upper limit of L1 = (total height of the housing 11 ) - (height L2 of the charging module 30 ).

[0091] Regarding the measurement of L1 and L2.

[0092] 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 in a direction away from the bottom plate.

[0093] The upper surface of the base plate is the center point of the flat area after removing the reinforcement ribs and welding points, and the bottom of the module is the vertical projection position of the lowest point of the module installation surface.

[0094] Specifically, a first filter 25 is further provided in the muffler chamber 21. This can prevent dust or debris from directly entering the vent 211, thereby improving the IP protection level, and also prevent wind from driving dust or debris into the housing 10 when the device is not started.

[0095] Furthermore, refer to Figure 1 、 Figure 2 and Figure 4 A first sound absorbing area 112 is further provided on the first side panel 11 . 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 .

[0096] The area of the first sound-absorbing zone 112 covers the area of the power module. Noise generated by the power module can be absorbed by the sound-absorbing material 60 of the first sound-absorbing zone 112. The first sound-absorbing zone 112 is rectangular. In one embodiment, the sound-absorbing material 60 is configured as sound-absorbing cotton (open-hole sound-absorbing cotton, ceramic fiber cotton); in other embodiments, it can also be foam aluminum or a micro-perforated plate + cavity structure.

[0097] 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. Simultaneously, the sound-absorbing cotton reduces the noise generated by the combined airflow and sound waves within the duct by increasing damping. The first sound-absorbing zone 112 achieves precise control of fan noise while maintaining heat dissipation efficiency through directional high-frequency absorption, suppression of duct resonance, and attenuation of turbulent noise.

[0098] Specifically, to enhance the noise absorption effect of the sound-absorbing cotton, the first sound-absorbing zone 112 is located above the resistant muffler 20 on the first side panel 11, and the sound-absorbing zone extends to the top edge of the resistant muffler 20. In other embodiments, the first sound-absorbing zone 112 may be provided within the muffler cavity 21 or on other side panels of the housing 10.

[0099] It is understandable that the same reactive muffler 20 can be provided at both the air inlet 111 and the air outlet 121 . The following describes a solution in which the reactive muffler 20 is provided at the air inlet 111 and a heat dissipation duct 40 is provided at the air outlet 121 .

[0100] Specifically, the housing 10 includes a second side panel 12 having an air outlet 121. The air outlet 121 is located near the bottom of the housing 10. The second side panel 12 is provided with a heat dissipation duct 40, which connects the air outlet 121 with the interior of the housing 10. The system fan 50 is disposed 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 panel 12. The heat dissipation duct 40 connects to the air outlet 121 and extends to the top of the second side panel 12.

[0101] In this embodiment, the system fan 50 is a plurality of axial fans 51 arranged on the heat dissipation duct 40. The plurality of axial fans 51 are arranged at intervals along the height direction of the second side panel 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 panel 12.

[0102] Usually, hot air will rise naturally, and the heat dissipation duct 40 extending to the top of the second side panel 12 can more effectively discharge the heat from the charging module 30 and improve the heat dissipation effect; at the same time, the heat dissipation duct 40 extends to the top, extending the airflow path, and can also increase the sound insulation effect over a certain length (increasing the number of reflections and absorptions of sound waves, thereby reducing the noise transmitted to the outside). It can be understood that the charging module 30 is the main heat source, and pointing the air inlet side of the fan at it can directly extract the hot air around the module to improve the heat dissipation efficiency.

[0103] Positioning the outlet side of the axial fan 51 facing the second side panel 12 is crucial for airflow guidance and noise control. This helps ensure airflow flows along the side panel, reducing turbulence and wind shear noise. Furthermore, this arrangement creates a certain amount of back pressure, optimizing fan efficiency and guiding airflow outward to avoid backflow.

[0104] The specific number of the axial flow fans 51 is not limited. For example, multiple groups are arranged horizontally and vertically, with two or three fans in each group spaced apart in the height direction.

[0105] Reference Figure 1 Specifically, in order to have sufficient distance to avoid airflow obstruction, reduce turbulence and noise, and ensure heat dissipation effect. The minimum straight-line distance from the wall of the heat dissipation duct 40 where the axial fan 51 is located to the plate surface of the second side panel 12 is L3, and L3 ≥ 100mm. If L3 is too small (such as < 50mm), it will limit the diffusion of airflow, causing high-speed airflow to directly impact the side panel, causing turbulence and backflow, and increasing pressure loss. L3 ≥ 100mm provides sufficient space for the airflow to diffuse evenly, reducing the pressure loss to within the design threshold.

[0106] The maximum size of L3 is limited by the size of the housing 10 and the distance between the power modules.

[0107] Specifically, the distance from the upper edge of the air outlet 121 to the bottom of the nearest axial fan 51 is L4, which is ≥ 200 mm. L4 is limited by the height of the entire machine, and the airflow has more opportunities to interact with the sound-absorbing structure (such as the sound-absorbing material 60 and the shape of the air duct) along the longer path, thereby attenuating the noise (for example, the sound-absorbing material 60 provided on the second side panel 12 further absorbs the noise generated by the fan).

[0108] 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 a corresponding point on the inner wall of the second side plate 12 (facing the inner wall of the heat dissipation duct 40) corresponding to the normal projection position of the same center point.

[0109] Regarding the measurement of L4, the distance is measured at the upper edge vertex of the effective ventilation area of the air outlet 121 (excluding the decorative structure, the highest point of the actual ventilation outlet 211 is used as the standard) and at the vertical projection position of the bottom of the impeller of the nearest axial flow fan 51.

[0110] The second side panel 12 also includes a second sound-absorbing area 122, corresponding to the axial fan 51. Sound-absorbing material 60 is provided in the second sound-absorbing area 122. In one embodiment, the sound-absorbing material 60 is sound-absorbing cotton (open-cell sound-absorbing cotton, ceramic fiber cotton); in other embodiments, it can also be foamed aluminum or a micro-perforated plate + cavity structure.

[0111] The sound-absorbing cotton directly absorbs the sound energy radiated by the axial flow fan. At the same time, it reduces the noise of the mixture of airflow and sound waves in the air duct by increasing damping. Through high-frequency directional absorption, air duct resonance suppression, and turbulent noise attenuation, it achieves precise control of fan noise while maintaining heat dissipation efficiency.

[0112] Combine Figure 6 Specifically, a second filter 41 is located below the axial fan 51 within the heat dissipation duct 40. When the air outlet 121 is not in operation (e.g., shut down or under low load), air pressure may draw in foreign matter (leaves, insects, debris) due to external forces. The second filter 41 prevents foreign matter from entering the duct, reducing the risk of the fan impeller becoming stuck. Furthermore, the filter's flow-balancing effect ensures a more even distribution of airflow through the mesh.

[0113] In addition to providing a heat dissipation duct 40 at the air outlet 121, the aforementioned resistant muffler 20 structure may also be provided within the heat dissipation duct 40. After the hot air flow is blown into the heat dissipation duct 40 by the axial flow fan 51, the air resistance is increased due to the hot air flow facing the second side panel 12, thereby reducing the noise of the axial flow fan 51. Furthermore, the sound-absorbing material 60 in the second sound-absorbing area 122 further reduces the noise.

[0114] Combine Figure 7 On this basis, a resistive silencer 20 is further provided, and hot air enters the silencer cavity 21 from the air vents on both sides, further attenuating the noise, which can effectively reduce the noise from the propagation path.

[0115] Reference Figure 8 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 toward the air outlet 121 in the muffler cavity 21 to form an arc-shaped guide portion 26. The arc-shaped guide portion 26, the cavity back plate 22, and the two cavity side plates 23 define a ventilation opening 211. The arc-shaped guide portion 26 guides the airflow flowing in the heat dissipation duct 40 to produce a Coanda effect on the arc-shaped guide portion 26.

[0116] The Coanda effect refers to the phenomenon that fluid tends to adhere to and flow along a convex curved surface. This can be used to control the direction of airflow, reduce separation and turbulence, and thus reduce noise and pressure loss.

[0117] The principle is that when the airflow flows through the convex surface of the arc-shaped guide portion 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 to form turbulence. The attached flow reduces the pressure loss caused by airflow separation.

[0118] The arc-shaped guide portion 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 duct 40 away from the second side plate 12. Common shapes of the curved surface include a curved arc, a gradually shrinking or expanding streamlined structure, or a guide plate with a specific angle.

[0119] That is, the cross section of the cavity bottom plate 24 in the height direction of the shell 10 is formed into an airfoil section, a circular arc section, a tapered arc section, an S-shaped hyperbolic section, etc.

[0120] In the above-described solution, the reactive muffler 20 is located below the module fan 32 in the vertical direction. Figure 9 The reactive muffler 20 may also be arranged in other ways.

[0121] Specifically, in this embodiment, the muffler chamber 21 extends from the first side panel 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 corresponding to the vent 211. Furthermore, a filter or grille can be further provided at the vent 211. Alternatively, porous sound insulation material can be provided at the vent 211.

[0122] This makes the area of the vent 211 smaller than the minimum cross-sectional area of the muffler cavity 21 perpendicular to the airflow direction. The area of the vent 211 is smaller than the minimum cross-sectional area of the muffler cavity 21, which can enhance the impedance change and thus more effectively attenuate noise of a specific frequency.

[0123] Because the length of the silencer chamber 21 in the direction of air flow is longer (that is, the sound wave reflection path is extended), the sound waves can be attenuated after more reflections in the silencer chamber 21; and a sound-absorbing material 60 lining (such as a micro-perforated plate or sound-absorbing cotton) can be set on the first side panel 11 to further attenuate the sound wave energy.

[0124] 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 transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A charging pile, characterized in that: include: A shell, wherein the circumferential sides of the shell are respectively provided with an air inlet and an air outlet; a charging module disposed in 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 muffler is provided at the air inlet and / or the air outlet, and has a muffler cavity and a vent communicating with the muffler cavity; wherein the area of the vent is smaller than the minimum cross-sectional area of the muffler cavity in a direction perpendicular to its axis.

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

3. The charging pile according to claim 1, characterized in that: The reactive muffler comprises 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, the cavity bottom plate is connected to the cavity side plates and the end of the cavity back plate away from the air inlet, and the cavity side plates, cavity back plate and cavity bottom plate and the inner wall of the shell together enclose the muffler cavity; Wherein, the ventilation openings are provided on both of the cavity side panels; or the ventilation openings are provided on at least one of the cavity side panels and the cavity back panel; or at least one of the ventilation openings is provided on the cavity back panel.

4. The charging pile according to claim 3, characterized in that: Each of the two cavity side panels is provided with a vent, and the two vents are arranged opposite to each other. The cavity bottom plate is located below the charging module, and the vent is close to the cavity bottom plate.

5. The charging pile according to claim 3, characterized in that: The vertical distance from the lower edge of the opening of the vent away from the cavity bottom plate to the upper edge of the air inlet is L1, and L1 is ≥ 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, and L2 is ≥ 200 mm.

6. The charging pile according to claim 1, characterized in that: The shell includes a first side panel with the air inlet; the air inlet is close to the bottom of the shell, the resistive silencer is arranged on the first side panel, the air inlet side of the modular fan faces the first side panel, and the resistive silencer is located below the modular fan in the vertical direction.

7. The charging pile according to claim 1, characterized in that: The housing includes a second side plate having the air outlet; the air outlet is close to the bottom of the housing, and the second side plate is provided with a heat dissipation duct, which connects the air outlet and the interior space of the housing; The charging pile further includes a system fan arranged on the heat dissipation air duct, wherein the air inlet side of the system fan faces the charging module, and the air outlet side of the system fan faces the second side plate.

8. The charging pile according to claim 7, characterized in that: The system fan includes a plurality of axial flow fans provided on the heat dissipation duct, the plurality of axial flow fans are arranged at intervals along the height direction of the second side plate, and the air inlet side of at least one axial flow fan corresponds to the charging module; And / or, the straight-line distance between the wall surface of the heat dissipation duct where the system fan is located and the plate surface of the second side plate is L3, and L3 is ≥ 100 mm; And / or, the vertical distance from the upper edge of the air outlet to the bottom of the system fan is L4, L4 ≥ 200mm; And / or, a second sound absorbing area is further provided on the second side panel, the second sound absorbing area corresponds to the system fan, and the second sound absorbing area is provided with sound absorbing material.

9. The charging pile according to claim 7, characterized in that: The air outlet is provided with the reactive muffler, and the reactive muffler is arranged in the heat dissipation duct. The heat dissipation duct is communicated with the air outlet through the vent.

10. The charging pile according to claim 9, characterized in that: The reactive muffler comprises a cavity bottom plate, two cavity side plates and a cavity back plate; The cavity back panel is opposite to the inner wall of the second side panel, the two cavity side panels are respectively connected to the opposite sides of the cavity back panel, the cavity bottom panel is connected to the cavity side panel and the end of the cavity back panel away from the air inlet, and the cavity side panel, the cavity back panel and the inner wall of the second side panel together enclose the muffler cavity; Among them, one end of the cavity bottom plate away from the second side plate is bent toward the air outlet and into the muffler cavity to form an arc guide portion, and the arc guide portion and the cavity back plate and two cavity side plates define the ventilation port.

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