A composite air duct for a charging pile

Abstract

A composite air duct for charging piles includes left and right cabinet doors on the left and right sides of the main structure. A charging module is housed within the main structure. A centrifugal fan and a brushless DC motor are integrated at the outlet of the charging module, with the brushless DC motor and centrifugal fan blades forming a single unit. A guide ring is located at the inlet of the centrifugal fan, and the channel near the fan blades forms the centrifugal air duct. A rotating air duct is positioned tangentially to the centrifugal fan impeller, connecting to the centrifugal air duct. An outlet for the rotating air duct connects to the DC air duct, allowing air to be exhausted outwards. This invention enables more efficient heat dissipation and provides a higher level of protection for the charging pile. This composite air duct structure reduces energy loss from the centrifugal fan, better matches the characteristics of the centrifugal fan, improves the overall performance of the charging pile, and significantly reduces the failure rate.

Description

Technical Field

[0001] This invention relates to a composite air duct for charging piles. Background Technology

[0002] Charging stations for new energy vehicles are a crucial logistical component for maintaining the energy supply of electric vehicles and ensuring their convenient and smooth operation. Currently, there are many types of charging stations on the market, with varying power levels; the technology in the charging station industry is relatively mature. However, significant challenges remain, such as heat dissipation, waterproofing, and dustproofing, which are detailed below.

[0003] Because the charging modules inside charging piles generate significant heat, the internal fans are crucial. Two types of fans are used on the market to address heat dissipation in charging piles: axial fans and centrifugal fans. Axial fans provide limited airflow. While they are suitable for some low-power charging piles, they are insufficient for medium- or high-power charging piles with numerous internal charging modules that generate substantial heat. Medium- and high-power charging piles using axial fans exhibit poor heat dissipation performance, are prone to overheating protection, and in severe cases, malfunction. Therefore, centrifugal fans are used for medium-power and high-power charging piles to improve heat dissipation. Since the main structure of most medium-power and high-power charging piles on the market is made of sheet metal, the sheet metal processing technology cannot accommodate complex curved surfaces. Centrifugal fans, due to centrifugal force, create a vortex-like flow of air within the air chamber before it exits through the outlet. Suitable ventilation duct structures for centrifugal fans are mostly "S-shaped," "Z-shaped," or "L-shaped," but currently, most medium-power and high-power charging piles on the market do not use these types of ducts. It still uses a "straight-through" air duct. When the centrifugal fan is working, the air pressure inside the duct is higher than the outside atmospheric pressure. At the air outlet, the air inside the air chamber is squeezed out to the outside by relying on the air pressure difference on both sides of the air outlet. This method has high requirements for the specifications of the centrifugal fan and has low efficiency and serious energy loss. In addition, since the centrifugal fan is fixed by fixing the motor, this fixing method is more complicated than the fixing method of axial flow fans and has more factors to consider. Therefore, the waterproof and dustproof performance of medium-power or high-power charging piles on the market is also poor. The above is an explanation of the heat dissipation and protection performance of charging piles. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to solve the heat dissipation, waterproofing and dustproofing problems encountered in existing charging piles, and to provide a composite air duct for charging piles.

[0005] The specific technical solution of the present invention is as follows:

[0006] A composite air duct for charging piles includes a main structure of the charging pile, with a left cabinet door and a right cabinet door on the left and right sides of the main structure, respectively. A charging module is installed inside the main structure of the charging pile, with an air inlet and an air outlet on either side of the charging module. When the charging module is working, it draws air from the outside. The right cabinet door of the charging pile is the air inlet of the entire charging pile. Outside air enters through the right cabinet door and enters the air inlet of the charging module. The cool air from the outside carries away the heat inside the charging module and flows out from the air outlet of the charging module.

[0007] A centrifugal fan and a brushless DC motor are installed on the air outlet side of the charging module. The brushless DC motor and the fan blades of the centrifugal fan are integrated into one structure. An air guide ring is installed on the air inlet of the centrifugal fan. The air enters from the air guide ring and flows out from the fan blades of the centrifugal fan. The channel near the fan blades is the centrifugal air duct.

[0008] A rotating air duct is installed in the tangential direction of the centrifugal fan impeller. The rotating air duct is connected to the centrifugal air duct. A rotating air duct outlet is installed at the end of the rotating air duct. The rotating air duct outlet is connected to a direct air duct, and the air is discharged outward from the direct air duct.

[0009] The main structure of the charging pile includes a first vertical sheet metal plate, a second vertical sheet metal plate, and several inclined sheet metal plates located between the two vertical sheet metal plates. The first vertical sheet metal plate, the second vertical sheet metal plate, and the inclined sheet metal plates together form an air cavity. The air guide ring is fixed to the first vertical sheet metal plate, and the bottom edge of the fan blade extends into the air cavity. The air cavity is connected to the rotating air duct.

[0010] The DC air duct is formed by a DC air duct sheet metal structure and is located between the centrifugal fan and the left cabinet door. The DC air duct is equipped with a DC air duct inlet and a DC air duct outlet. Multiple partitions are installed inside the DC air duct, each partition is inclined, and the left side of the partition is tangent to the air outlet of the left cabinet door. The DC air duct is composed of the inner side of the left cabinet door, the inclined surface of the partition, and the four sides of the sheet metal on the left and right sides. An elongated hole is opened on the left cabinet door, and the air passes through the DC air duct and is discharged from the elongated hole on the left cabinet door.

[0011] The partition has an inclination angle of 15°.

[0012] The cross-sectional area of ​​the centrifugal air duct outlet is less than the cross-sectional area of ​​the DC air duct inlet. A small sheet metal window is installed at the DC air duct inlet. After the air comes out of the rotating air duct, it passes through the small sheet metal window and is discharged through the pressure difference between the inside and outside.

[0013] The centrifugal fan is fixed to the sheet metal structure of the DC air duct, and a reinforcing rib is installed on the left cabinet door. The sheet metal structure of the DC air duct is fixed on the reinforcing rib.

[0014] The radius of curvature of the air guide ring is ≥50mm, the radius of curvature of the rotating air duct is ≥50mm, and the ratio of the radius of curvature of the rotating air duct to the radius of curvature of the air guide ring is ≥1.

[0015] The beneficial effects of this invention are: the composite air duct of the charging pile enables more efficient heat dissipation and provides a higher level of protection. This composite air duct structure reduces the energy loss of the centrifugal fan, better matches the characteristics of the centrifugal fan, improves the overall performance of the charging pile, and significantly reduces the failure rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the air intake and exhaust of the charging pile according to the present invention;

[0017] Figure 2 This is a schematic diagram of a centrifugal air duct structure;

[0018] Figure 3 Layout diagrams of centrifugal and direct current air duct structures;

[0019] Figure 4 This is a schematic diagram of a DC air duct structure;

[0020] Figure 5 This is a schematic diagram of the air outlet of a DC air duct.

[0021] Figure 6 The diagram shows the cross-sectional area S1 of the centrifugal air duct outlet and the cross-sectional area S2 of the DC air duct inlet. Detailed Implementation

[0022] 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 creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, a composite air duct for a charging pile includes a main structure 18 of the charging pile. A left cabinet door 10 and a right cabinet door 17 are respectively located on the left and right sides of the main structure 18. A louvered structure 19 is installed on the right cabinet door 17. A charging module 12 is installed inside the main structure 18. An air inlet 13 and an air outlet 14 are located on either side of the charging module 12. The main structure 18 is assembled from sheet metal. When the charging module 12 is working, it draws air from the outside. The right cabinet door 17 serves as the air inlet for the entire charging pile. Outside air enters through the right cabinet door 17, passes through the louvered structure 19, and enters the air inlet 13 of the charging module. The cool outside air carries away the heat inside the charging module 12 and flows out through the air outlet 14.

[0024] A centrifugal fan 1 and a brushless DC motor 3 are installed on the air outlet side of the charging module 12. The brushless DC motor 3 drives the centrifugal fan 1 to work. The centrifugal fan 1 is fixed on the side of the brushless DC motor 3, and the brushless DC motor 3 and the fan blades of the centrifugal fan 1 are an integral structure. An air guide ring 2 is installed on the air inlet of the centrifugal fan 1. The air enters from the air guide ring 2 and flows out from the fan blades of the centrifugal fan 1. The channel near the fan blades is the centrifugal air duct 20.

[0025] The main structure 18 of the charging pile includes a first vertical sheet metal plate 22, a second vertical sheet metal plate 23, and several inclined sheet metal plates 24 located between the two vertical sheet metal plates. These components together form an air cavity 4. The air guide ring 2 is fixed to the first vertical sheet metal plate 22, and the bottom edge of the fan blades extends into the air cavity 4.

[0026] Furthermore, there can be multiple inclined sheet metal plates 24 between the two vertical sheet metal plates, and centrifugal fans 1 are provided between adjacent inclined sheet metal plates 24, thus forming multiple air cavities 4, each with the same structure.

[0027] The air chamber 4 is connected to the rotating air duct 5, which is located in the tangential direction of the impeller of the centrifugal fan 1. The front end of the rotating air duct 5 is connected to the centrifugal air duct 20, and the end of the rotating air duct 5 is provided with a rotating air duct outlet 15, which is connected to the DC air duct 7. The DC air duct 7 is provided with a DC air duct inlet 16 and a DC air duct outlet 21.

[0028] It should be noted that the rotating air duct 5 is located at the outlet of the air cavity 4. The rotating air duct 5 is also made of sheet metal, with an arc formed by bending. The sheet metal arc forms the rotation path. Since the air from the centrifugal fan 1 is thrown out tangentially from the impeller of the centrifugal fan, this arc is in the tangential direction. The air passes through this arc, and this arc path is the rotating air duct 5. In other words, the air outlet of the centrifugal fan 1 is located inside the air cavity 4. The air cavity 4 is equipped with a centrifugal air duct 20 and a rotating air duct 5. The centrifugal air duct 20 is formed by the centrifugal air duct sheet metal structure 6, and the end of the centrifugal air duct sheet metal structure 6 is bent to form the rotating air duct 5.

[0029] Furthermore, the DC air duct 7 is formed by the DC air duct sheet metal structure 8, and the DC air duct 7 is located between the centrifugal fan 1 and the left cabinet door 10. A ventilation opening, namely the DC air duct inlet 16, is located at the connection between the DC air duct sheet metal structure 8 and the rotary air duct outlet 15. This allows heated air to enter the DC air duct 7 more efficiently from the rotary air duct outlet 15. A sheet metal window 25 is provided at the DC air duct inlet 16. After the air exits from the rotary air duct 5, it passes through the sheet metal window 25. Due to the uneven pressure inside the sheet metal window 25, the air is discharged through the pressure difference between the inside and outside of the sheet metal window 25.

[0030] Multiple baffles 9 are installed inside the DC air duct 7, each baffle 9 is inclined at an angle of 15°, and the left side of the baffle 9 is tangent to the air outlet of the left cabinet door 10. Thus, the space between the outer side of the sheet metal window 25 and the left cabinet door 10 constitutes the DC air duct 7. The DC air duct 7 is composed of the inner side of the left cabinet door 10, the inclined surface of the baffle 9, and the four sides of the sheet metal. The left cabinet door 10 has an elongated hole, and the air passes through the DC air duct 7 and is discharged from the elongated hole on the left cabinet door 10. The combination of the above structures can achieve high protective performance.

[0031] Furthermore, the centrifugal fan 1 is fixed to the DC air duct sheet metal structure 8, and a reinforcing rib 11 is installed on the left cabinet door 10, with the DC air duct sheet metal structure 8 fixed on the reinforcing rib 11.

[0032] Furthermore, the centrifugal air duct sheet metal structure 6 is bolted and fixed to the DC air duct sheet metal structure 8.

[0033] Furthermore, the radius of curvature of the air guide ring 2 is ≥50mm, the radius of curvature of the rotating air duct 5 is ≥50mm, and the ratio of the radius of curvature of the rotating air duct to the radius of curvature of the air guide ring 2 is ≥1.

[0034] Furthermore, the cross-sectional area S1 of the centrifugal air duct outlet is less than the cross-sectional area S2 of the DC air duct inlet.

[0035] The principle of this invention is:

[0036] When the centrifugal fan 1 starts working, it begins to draw air from inside the charging pile. The heated air flows out of the air outlet 14 of the charging module and, driven by the centrifugal fan, enters the air guide ring 2. The edge of the air guide ring 2 is curved and has a radius of curvature, which allows the heated air to enter and exit the air guide ring 2 more effectively. After this part of the air flows out of the air guide ring 2, it enters the air cavity 4. Driven by the centrifugal fan 1, this part of the air circulates in the air cavity 4 and then enters the rotating air duct 5 through the centrifugal air duct 20. The rotating air duct 5 has a radius of curvature, which is the same as or similar to the radius of curvature of the vortex formed by the heated air. This allows the heated air to be more efficiently ejected from the rotating air duct outlet 15 and enter the direct air duct 7. Since the cross-sectional area of ​​the rotating air duct outlet 15 is different from that of the direct air duct inlet 16, and the cross-sectional area S1 of the centrifugal air duct outlet is less than the cross-sectional area S2 of the direct air duct inlet, the air pressure P1 of the centrifugal air duct outlet is greater than the air pressure P2 of the direct air duct inlet. This allows the air in the air cavity 4 to flow more quickly into the direct air duct 7. As this heated air enters the direct air duct 7, the air pressure inside the direct air duct 7 increases. The air pressure P3 inside the direct air duct 7 is greater than the external atmospheric pressure P0. This allows the air inside the direct air duct 7 to flow better to the direct air duct outlet 21 and then to the outside through the unit outlet of the left cabinet door 10.

[0037] The core of this invention is as follows: To improve heat dissipation in charging piles, centrifugal fans are required. To maximize the performance of these fans and reduce energy loss, a suitable and compatible heat dissipation structure must be designed inside the charging pile. This means the charging pile needs a rotating air duct suitable for the centrifugal fan. Since the airflow path within the centrifugal fan cavity is vortex-shaped and aligned with the direction of centrifugal force during operation, a rotating air duct must be designed so that its curvature aligns with the airflow direction within the cavity, allowing for more efficient air ejection. Furthermore, the overall airflow direction of the charging pile should be aligned with the fixed direction of the centrifugal fan; that is, the overall airflow direction of the charging pile should be aligned with the central axis of the vortex formed by the airflow within the cavity. Since both directions satisfy the "right-hand rule," the direction of the air ejected by the rotating air duct must be carefully controlled. The direction of airflow needs to be changed to align with the overall airflow direction of the unit, requiring the design of a DC air duct. This DC air duct structure exists at the rear end of the centrifugal air duct. Air from the air chamber is thrown out along the centrifugal air duct. Due to the radius of curvature of the rotating air duct, the air in the air chamber can be more effectively thrown out of the rotating air duct and into the DC air duct. Because the cross-sectional area of ​​the centrifugal air duct outlet is different from that of the DC air duct inlet (C1 < C2), the air pressure at the centrifugal air duct outlet (P1) is greater than the air pressure at the DC air duct inlet (P2), allowing the air in the air chamber to circulate more quickly into the DC air duct. When air enters the DC air duct, the air pressure inside rises, and the air pressure P3 inside the DC air duct is greater than the external atmospheric pressure P0, thus allowing the air in the DC air duct to circulate more effectively to the outside. The DC air duct is also designed with a flow channel. The partition 9 of the DC air duct 7 is inclined at an angle of 15°. When water enters the charging pile air outlet from the outside, the water will not accumulate in the DC air duct and will flow to the outside along the partition 9, which has good waterproof performance. At the same time, important components such as centrifugal fans are located on the side of the centrifugal air duct, and the cross-sectional area S1 of the centrifugal air duct outlet is less than the cross-sectional area S2 of the DC air duct inlet. The difference between S1 and S2 is large, and the important components are far away from the centrifugal air duct outlet and there is a rotation path, which has good dust prevention performance. The above is the basic concept of this technical solution.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A composite ventilation duct for charging piles, characterized in that: The charging pile includes a main structure (18), with a left cabinet door (10) and a right cabinet door (17) on the left and right sides of the main structure (18). A charging module (12) is installed inside the main structure (18), with a charging module air inlet (13) and a charging module air outlet (14) on the two sides of the charging module (12). When the charging module (12) is working, the charging module (12) draws air from the outside. The right cabinet door (17) of the charging pile is the air inlet of the entire charging pile. Outside air enters from the right cabinet door (17) and enters the charging module air inlet (13). The cool air from the outside carries away the heat inside the charging module (12) and flows out from the charging module air outlet (14). A centrifugal fan (1) and a brushless DC motor (3) are provided on the air outlet side of the charging module (12). The brushless DC motor (3) and the fan blades of the centrifugal fan (1) are integrated. A guide ring (2) is provided on the air inlet of the centrifugal fan (1). The air enters from the guide ring (2) and flows out from the fan blades of the centrifugal fan (1). The channel near the fan blades is a centrifugal air duct (20). A rotating air duct (5) is set in the tangential direction of the impeller of the centrifugal fan (1). The rotating air duct (5) is connected to the centrifugal air duct (20). A rotating air duct outlet (15) is set at the end of the rotating air duct (5). The rotating air duct outlet (15) is connected to the direct air duct (7). The air is discharged outward from the direct air duct (7). The main structure (18) of the charging pile is provided with a first vertical sheet metal plate (22), a second vertical sheet metal plate (23) and several inclined sheet metal plates (24) located between the two vertical sheet metal plates. The first vertical sheet metal plate (22), the second vertical sheet metal plate (23) and the inclined sheet metal plates (24) together form a wind cavity (4); wherein, the air guide ring (2) is fixed on the first vertical sheet metal plate (22), the bottom edge of the fan blade extends into the wind cavity (4), and the wind cavity (4) is connected to the rotating air duct (5); The DC air duct (7) is formed by the DC air duct sheet metal structure (8) and is located between the centrifugal fan (1) and the left cabinet door (10). The DC air duct (7) is provided with a DC air duct inlet (16) and a DC air duct outlet (21). Multiple partitions (9) are provided inside the DC air duct (7). Each partition (9) is inclined. The left side of the partition (9) is tangent to the outlet of the left cabinet door (10). The DC air duct (7) is composed of the inner side of the left cabinet door (10), the inclined surface of the partition (9), and the four sides of the sheet metal on the left and right sides. The left cabinet door (10) has an elongated hole. The air passes through the DC air duct (7) and is discharged from the elongated hole on the left cabinet door (10). The cross-sectional area of ​​the centrifugal air duct outlet is less than the cross-sectional area of ​​the DC air duct inlet. A sheet metal window (25) is provided at the DC air duct inlet (16). After the air comes out from the rotating air duct (5), it passes through the sheet metal window (25) and is discharged through the pressure difference between the inside and outside.

2. The composite ventilation duct for charging piles according to claim 1, characterized in that: The tilt angle of the partition (9) is 15°.

3. The composite ventilation duct for charging piles according to claim 1, characterized in that: The centrifugal fan (1) is fixed to the DC air duct sheet metal structure (8), and the left cabinet door (10) is equipped with a reinforcing rib (11). The DC air duct sheet metal structure (8) is fixed on the reinforcing rib (11).

4. The composite ventilation duct for charging piles according to claim 1, characterized in that: The radius of curvature of the air guide ring (2) is ≥50mm, the radius of curvature of the rotating air duct (5) is ≥50mm, and the radius of curvature of the rotating air duct / the radius of curvature of the air guide ring (2) is ≥1.

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