A heat dissipation structure of a direct current charger for a two-wheeled vehicle

Abstract

The utility model discloses a two -wheel car direct current charger's heat dissipation structure, including bottom shell, the top shell is installed to the top of bottom shell, the inside installation of bottom shell has the PCB board, install the heat dissipation shell on the PCB board, even install a plurality of heat dissipation fin on the heat dissipation shell, the both sides of top shell are equipped with the concave portion, even set up the heat dissipation hole on the concave portion, the one side mounting of top shell has the heat dissipation fan. Through the profiling design of heat dissipation shell and PCB board, cooperate the filling of insulating heat -conducting silicone grease, shorten the heat transfer path. The active heat dissipation system formed by heat dissipation fin and heat dissipation fan, in combination with the airflow guide effect of isosceles trapezoidal concave portion, ensure that the working temperature of PCB board is in stable range. At the same time, the concave portion of isosceles trapezoid will slide along the waist surface due to gravity when the rainwater contacts the inclined waist surface, and cannot directly enter the heat dissipation hole located on the upper bottom. Avoided the waterlogging corner, ensure that moisture can be discharged quickly.

Description

Technical Field

[0001] This utility model relates to the field of DC charger technology, specifically a heat dissipation structure for a DC charger for two-wheeled vehicles. Background Technology

[0002] As electric two-wheelers develop towards longer range and faster charging, the power density of their matching DC chargers continues to increase, and the heat generated by internal power devices (such as MOSFETs, transformers, rectifier bridges, etc.) increases significantly during the charging process.

[0003] Current mainstream two-wheeled vehicle charger heat dissipation solutions have the following shortcomings:

[0004] Insufficient heat dissipation efficiency: Traditional designs often use a natural convection mode with a PCB board and simple heat sinks, or sometimes a cooling fan. However, the heat transfer path from the device to the environment is long and the thermal resistance is high. This results in the heat dissipation capacity not keeping up with the increased power requirements, especially in high-temperature environments during summer.

[0005] Poor waterproof performance: To enhance heat dissipation, most chargers have large direct ventilation holes on the side or top of the casing. Although this can improve air circulation, rainwater can easily enter the internal contact circuit board through the ventilation holes in rainy weather, causing short circuits and posing certain safety hazards.

[0006] To address this, a heat dissipation structure for a DC charger used in two-wheeled vehicles is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a heat dissipation structure for a DC charger for two-wheeled vehicles, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a heat dissipation structure for a DC charger for two-wheeled vehicles, including a bottom shell, a top shell mounted on the top of the bottom shell, a PCB board mounted inside the bottom shell, a heat dissipation shell mounted on the PCB board, and multiple heat dissipation fins evenly mounted on the heat dissipation shell.

[0009] The top shell has recessed portions on both sides, and heat dissipation holes are evenly distributed on the recessed portions. A cooling fan is installed on one side of the top shell.

[0010] Preferably, the cross-section of the concave portion is an isosceles trapezoid, and the heat dissipation hole is located at the upper base of the isosceles trapezoid.

[0011] Preferably, a support plate is installed inside the top shell, and a receiving chamber is formed between the support plate and the top shell, and the cooling fan is installed inside the receiving chamber.

[0012] Preferably, the heat sink and the PCB board are fixedly connected by bolts and sealed with a sealing ring.

[0013] Preferably, the space between the heat sink and the PCB board is filled with insulating thermally conductive silicone grease.

[0014] Preferably, a filter screen is installed inside the heat dissipation hole.

[0015] Preferably, the joint between the bottom shell and the top shell adopts a stepped structure, and each stepped surface is equipped with a silicone sealing strip.

[0016] Compared with existing technologies, the advantages of this invention are as follows: The heat dissipation shell and PCB board are designed to mimic their shapes, and the use of insulating thermal grease shortens the heat transfer path. The active cooling system formed by the heat dissipation fins and cooling fan, combined with the airflow guidance effect of the concave isosceles trapezoid, ensures that the PCB board's operating temperature remains within a stable range. Simultaneously, when rainwater comes into contact with the sloping waist surface, it will slide down the waist surface due to gravity, preventing it from directly entering the heat dissipation holes located at the top. This avoids water accumulation dead zones and ensures that water can be quickly drained. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the PCB board and heat sink of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the heat dissipation shell and the top shell of this utility model;

[0020] Figure 4 This is a cross-sectional structural diagram of the heat dissipation shell and top shell of this utility model.

[0021] In the diagram: 1. Bottom shell; 2. Top shell; 3. Recessed part; 4. Heat dissipation hole; 5. PCB board; 6. Heat dissipation shell; 7. Heat dissipation fins; 8. Support plate; 9. Cooling fan. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a heat dissipation structure for a DC charger for two-wheeled vehicles, including a bottom shell 1, a top shell 2 installed above the bottom shell 1, a PCB board 5 installed inside the bottom shell 1, a heat dissipation shell 6 installed on the PCB board 5, and multiple heat dissipation fins 7 evenly installed on the heat dissipation shell 6.

[0024] like Figure 1As shown: The top shell 2 has recessed portions 3 on both sides, with evenly spaced heat dissipation holes 4 on each recessed portion 3. A cooling fan 9 is installed on one side of the top shell 2. The cross-section of the recessed portion 3 is an isosceles trapezoid, and the heat dissipation holes 4 are located at the upper base of the isosceles trapezoid. Through this arrangement, the two sides of the isosceles trapezoid are symmetrically inclined. When the cooling fan 9 is activated, external cold air is guided along the inclined sides to the upper base area of ​​the recessed portion 3, i.e., the location of the heat dissipation holes 4. The funnel effect formed by the inclined sides accelerates airflow convergence, allowing more cold air to enter the shell through the heat dissipation holes 4.

[0025] Meanwhile, when using two-wheeled vehicles outdoors, rain is inevitable. When rainwater comes into contact with the inclined waist surface, it will slide down the waist surface due to gravity and will not directly impact or seep into the heat dissipation holes 4 located on the upper bottom. At the same time, the junction between the waist surface and the upper bottom is an obtuse angle transition, avoiding dead corners for water accumulation and ensuring that water can be drained quickly.

[0026] The recessed structure of the inner part 3 places the heat dissipation hole 4 in a relatively inner position. Combined with the narrowing design of the isosceles trapezoid, it can reduce the probability of external dust, fallen leaves, insects and other foreign objects directly contacting the heat dissipation hole 4. Combined with the filter screen inside the heat dissipation hole 4, it further improves the stability of equipment operation.

[0027] like Figure 3 and Figure 4 As shown: A support plate 8 is installed inside the top shell 2, and a housing chamber is formed between the support plate 8 and the top shell 2. The cooling fan 9 is installed inside the housing chamber. Through the above arrangement, the housing chamber separates the cooling fan 9 from the heat dissipation fins 7 area inside the shell. When the fan is working, the cold air enters the housing chamber from the heat dissipation hole 4 of the concave part 3 on one side, is accelerated by the fan at the front end of the housing chamber, and is then concentrated and blown towards the heat dissipation fins 7. The hot air is discharged from the heat dissipation hole 4 on the other side, forming a high-efficiency convection.

[0028] like Figure 2 As shown: The heat sink 6 is fixedly connected to the PCB board 5 by bolts and sealed with a sealing ring. Insulating thermally conductive silicone grease, approximately 0.2–0.3 mm thick, fills the space between the heat sink 6 and the PCB board 5. Through this arrangement, the heat sink 6 serves as a conformal shell to the PCB board 5. The core characteristic of the insulating thermally conductive silicone grease lies in its excellent thermal conductivity. Because the electronic components (such as power transistors and transformers) on the surface of the PCB board 5 have uneven surfaces, the contact surface with the heat sink 6 cannot be completely aligned, easily forming air gaps that hinder heat transfer. The silicone grease can fill these gaps, allowing heat to be quickly conducted from the heat-generating points of the PCB board 5 to the heat sink 6, and then dissipated through the heat dissipation fins 7.

[0029] like Figure 3 As shown: A filter screen is installed inside the heat dissipation hole 4; through the above settings, the filter screen can block dust and flying insects, preventing flying insects from entering the casing and affecting the normal operation of the equipment.

[0030] like Figure 1 As shown: The joint between the bottom shell 1 and the top shell 2 adopts a stepped structure, with a silicone sealing strip installed on each stepped surface. Through this design, the mating surfaces of the upper and lower shells are stepped, with a silicone sealing strip installed on each stepped surface. The silicone sealing strip has a circular cross-section with a diameter of 3mm. When tightened with screws, the sealing strip is evenly compressed, forming multiple waterproof lines. The screw holes are countersunk, and a waterproof gasket is added to the screw head to prevent moisture from seeping in through the screw gaps.

[0031] Working principle: First, the PCB board 5 is precisely fixed to the preset mounting position inside the base shell 1 using bolts, ensuring that there is no looseness between the PCB board 5 and the base shell 1. Then, a layer of insulating thermal grease with a thickness of approximately 0.2-0.3 mm is evenly applied to the inside of the heat sink 6, completely covering the contact area between the heat sink 6 and the PCB board 5. The heat sink 6 is then aligned with the densely packed heat-generating components of the PCB board 5 and tightened to the PCB board 5 using 6-8 circumferentially distributed bolts. Simultaneously, the sealing ring between the two is made of heat-resistant silicone, achieving both sealing and heat conduction effects.

[0032] Before assembling the top shell 2, the cooling fan 9 must be fixed in the housing formed by the support plate 8 and the top shell 2, with the fan outlet facing the inside of the housing. During installation, a gap of 1-2mm must be maintained between the fan and the housing to avoid resonance and noise. When the top shell 2 is snapped into the bottom shell 1, the stepped splicing structure of the two must be aligned. The silicone sealing strip on each stepped surface must have a circular cross-section, a diameter of 3mm, and be wrinkle-free. It is secured with 12-16 M3 countersunk screws, with a 1mm thick nitrile rubber waterproof gasket added to the screw head to form multiple waterproof barriers.

[0033] When the equipment is operating, the heat generated by the PCB board 5 is rapidly conducted to the heat sink 6 through insulating thermal grease, and then diffused into the surrounding air through multiple heat dissipation fins 7 on the surface of the heat sink 6. The fins are 0.8mm thick and spaced 5mm apart. At this time, the cooling fan 9 starts to form a directional airflow. Cool air enters the housing chamber from the heat dissipation hole 4 in the recessed part 3 on one side of the top shell 2, flows through the heat dissipation fins 7 and carries away the heat, and finally exits from the heat dissipation hole 4 in the recessed part 3 on the other side. The inclined waist surface of the isosceles trapezoidal recessed part 3 with an inclination angle of 30° can prevent rainwater from directly intruding.

[0034] In rainy or humid environments, the stepped splicing structure of the silicone sealing strip and the screw waterproof gasket work together to prevent water from seeping in. The isosceles trapezoidal design of the concave part 3 allows rainwater to slide off along the waist surface and not accumulate near the heat dissipation hole 4. In high-temperature environments, the synergistic effect of the heat dissipation fins 7 and the cooling fan 9 can meet the heat dissipation needs of the two-wheeled vehicle when exposed to the sun in summer or charging for a long time.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat dissipation structure for a DC charger for two-wheeled vehicles, comprising a bottom shell (1), characterized in that: A top shell (2) is installed above the bottom shell (1). A PCB board (5) is installed inside the bottom shell (1). A heat sink (6) is installed on the PCB board (5). Multiple heat sink fins (7) are evenly installed on the heat sink (6). The top shell (2) has recessed portions (3) on both sides, and heat dissipation holes (4) are evenly opened on the recessed portions (3). A cooling fan (9) is installed on one side of the top shell (2).

2. The heat dissipation structure of a DC charger for two-wheeled vehicles according to claim 1, characterized in that: The cross-section of the concave portion (3) is an isosceles trapezoid, and the heat dissipation hole (4) is located at the upper base of the isosceles trapezoid.

3. The heat dissipation structure of a DC charger for two-wheeled vehicles according to claim 1, characterized in that: A support plate (8) is installed inside the top shell (2), and a receiving chamber is formed between the support plate (8) and the top shell (2). The cooling fan (9) is installed inside the receiving chamber.

4. The heat dissipation structure of a DC charger for two-wheeled vehicles according to claim 1, characterized in that: The heat sink (6) is fixedly connected to the PCB board (5) by bolts and sealed with a sealing ring.

5. The heat dissipation structure of a DC charger for two-wheeled vehicles according to claim 1, characterized in that: The space between the heat sink (6) and the PCB board (5) is filled with insulating thermally conductive silicone grease.

6. The heat dissipation structure of a DC charger for two-wheeled vehicles according to claim 1, characterized in that: A filter screen is installed inside the heat dissipation hole (4).

7. The heat dissipation structure of a DC charger for two-wheeled vehicles according to claim 1, characterized in that: The joint between the bottom shell (1) and the top shell (2) adopts a stepped structure, and each stepped surface is equipped with a silicone sealing strip.

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