Air-cooled DC charging gun

Abstract

This utility model discloses an air-cooled DC charging gun, relating to the field of charging equipment technology. The air-cooled DC charging gun includes a gun housing and a fan. The gun housing has an inner cavity and an air inlet and an air outlet communicating with the inner cavity, both located on the lower side of the gun housing. The fan is installed in the inner cavity and located at the air outlet. The fan guides air entering from the air inlet to the air outlet. The technical solution provided by this utility model prevents rainwater from entering the gun body and also improves the forced heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of charging equipment technology, and in particular to an air-cooled DC charging gun. Background Technology

[0002] In recent years, with the popularization of new energy electric vehicles, the requirements for supporting charging equipment have also been increasing. In order to meet the needs of electric vehicle range, battery capacity has been gradually increasing, which makes it necessary to use charging equipment with higher power to achieve fast charging.

[0003] The charging rate of conventional DC charging guns can no longer meet the current demand for fast charging. Therefore, DC charging guns with forced cooling structures are gradually gaining attention. Among them, air-cooled DC charging guns that utilize forced cooling with fans have been applied as a technical approach to improve charging speed. This type of air-cooled DC charging gun can effectively reduce the temperature rise of the gun head through forced cooling, thereby improving charging efficiency.

[0004] However, existing air-cooled DC power coolers have the following two drawbacks: 1. Because effective cooling requires passing through the power terminal crimping area or heat-conducting components between the gun heads, the air inlet and outlet are relatively far apart. In conventional designs, the fan outlet faces downwards, while the air inlet is located slightly above the gun head. This design makes it easy for rainwater to enter the gun head, potentially causing electrical malfunctions. 2. To prevent foreign objects from entering, the air inlet is usually designed with a mesh-like perforated structure. However, dust in the air easily accumulates in the air inlet, reducing heat dissipation efficiency and even affecting the normal function of the air-cooled DC power cooler. Utility Model Content

[0005] The main purpose of this invention is to propose an air-cooled DC charging gun, which aims to prevent rainwater from entering the gun body and also improve the forced heat dissipation effect.

[0006] To achieve the above objectives, this utility model proposes an air-cooled DC charging gun, which includes:

[0007] A gun casing, the gun casing having an inner cavity and an air inlet and an air outlet communicating with the inner cavity, the air inlet and the air outlet being spaced apart, and both the air inlet and the air outlet being located on the lower side of the gun casing; and

[0008] A fan is installed in the inner cavity and located at the air outlet; the fan is used to guide the air entering from the air inlet to the air outlet.

[0009] In one embodiment, the gun casing includes a main casing and at least one side casing, the side casing being disposed on the outer side wall of the main casing, and the lower side of the side casing and the main casing enclosing each other to form the air inlet.

[0010] In one embodiment, there are two side shells, which are located on the two outer side walls of the main shell, respectively.

[0011] In one embodiment, the outer wall of the main housing and the side shell enclose each other to form an airflow channel, the airflow channel connects the inner cavity and the air inlet, and the longitudinal cross-sectional shape of the airflow channel is flared.

[0012] In one embodiment, at least one side of the airflow channel is an arc surface.

[0013] In one embodiment, the arc surface is provided with a flow-guiding groove, which is used to guide droplets to flow out from the air inlet.

[0014] In one embodiment, the gun housing further includes a bottom shell, which is disposed on the bottom wall of the main housing, the fan is installed inside the bottom shell, and the bottom shell is provided with the air outlet.

[0015] In one embodiment, the air-cooled DC charging gun further includes a gun head assembly, the gun head assembly comprising:

[0016] Gun head shell, wherein the gun head shell is detachably connected to the gun shell;

[0017] Mounting component, detachably connected to the nozzle housing, used for mounting DC pin terminals; and

[0018] A heat-conducting block is connected to the mounting component and abuts against the DC pin terminal.

[0019] In one embodiment, the mounting component includes a retaining ring and a pressure plate, the retaining ring and the pressure plate being detachably connected to the gun head housing in sequence, and the heat-conducting block being disposed between the retaining ring and the pressure plate.

[0020] In one embodiment, the gun head shell is filled with thermally conductive adhesive.

[0021] The air-cooled DC charging gun of this utility model includes a gun housing and a fan. The gun housing has an inner cavity and a connecting air inlet and outlet, both located on the lower side of the gun housing. The fan is installed in the inner cavity and positioned at the outlet, guiding air from the air inlet to the outlet. By placing the air inlet and outlet on the same lower side, a vertical airflow circulation is formed on the same horizontal plane. This layout not only reduces the airflow path length but also enhances air exchange efficiency and improves forced cooling through the fan's directional airflow guidance. With the air inlet located on the lower side of the gun housing, rainwater flowing along the outer wall of the gun housing is blocked by the edge of the air inlet, and the low-positioned air inlet reduces the intake of high-altitude suspended dust, thereby preventing rainwater from entering the gun housing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an embodiment of the air-cooled DC charging gun provided by this utility model;

[0024] Figure 2 for Figure 1 Schematic diagram of section AA in the diagram;

[0025] Figure 3 Exploded view of the structure of the air-cooled DC charging gun provided by this utility model;

[0026] Figure 4 An exploded view of the gun head assembly of the air-cooled DC charging gun provided by this utility model.

[0027] Explanation of icon numbers:

[0028] 10. Gun casing; 11. Main casing; 12. Side casing; 13. Bottom casing; 10a. Inner cavity; 10b. Air inlet; 10c. Air outlet; 10d. Airflow channel; 20. Fan; 30. Gun head assembly; 31. Gun head shell; 32. Mounting component; 321. Retaining ring; 322. Pressure plate; 33. Heat-conducting block.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] In existing technologies, the widespread adoption of new energy electric vehicles has driven the demand for fast charging equipment. Conventional DC charging guns typically have their air inlet located at the top of the gun body and the air outlet at the bottom. This design results in an excessively long airflow path, affecting heat dissipation efficiency. Furthermore, the high-positioned air inlet makes it easy for rainwater to seep into the gun body, potentially causing circuit malfunctions. While the mesh structure of the air inlet can block foreign objects, long-term dust accumulation can clog the airflow channels, further reducing heat dissipation performance.

[0034] To address the aforementioned issues, we first analyzed the heat dissipation path and waterproofing deficiencies of existing air-cooled charging guns. The vertical distance between the high-position air inlet and the low-position air outlet increases airflow resistance, limiting heat dissipation efficiency. When rainwater flows along the gun's surface, the high-position opening more easily introduces moisture. The dust accumulation at the air inlet stems from the misalignment of airflow direction with the direction of gravity. Therefore, we considered placing both the air inlet and outlet at the bottom of the gun housing, shortening the circulation path by optimizing the airflow direction. Simultaneously, the relationship between the fan position and the air outlet needs to be redesigned to achieve directional airflow guidance.

[0035] Therefore, please see Figures 1 to 3 This application proposes an air-cooled DC charging gun, including a gun housing 10 and a fan 20. The gun housing 10 has an inner cavity 10a and a communicating air inlet 10b and air outlet 10c, with the air inlet 10b and air outlet 10c spaced apart and both located on the lower side of the gun housing 10. The fan 20 is installed in the inner cavity 10a and positioned at the air outlet 10c, for guiding air from the air inlet 10b to the air outlet 10c.

[0036] The inner cavity 10a of the gun casing 10 refers to the sealed space formed inside the gun body. Specifically, it can be formed into an integrated cavity structure using injection molding, serving as an airflow circulation channel. The air inlet 10b and air outlet 10c are located on the lower side, meaning both openings face downwards, utilizing gravity to reduce the probability of liquid intrusion. The fan 20 is installed at the air outlet 10c, meaning its impeller axis coincides with the center line of the air outlet 10c. Specifically, a centrifugal fan 20 can be used, using negative pressure to accelerate airflow from the air inlet 10b and direct it out of the air outlet 10c.

[0037] Specifically, external air enters the inner cavity 10a of the gun housing 10 through the lower air inlet 10b and flows upward along the inner cavity 10a under the negative pressure generated by the fan 20. The airflow absorbs heat as it passes through the electronic component area inside the gun body and is then forcibly guided by the fan 20 to be discharged through the lower air outlet 10c. Because the airflow circulation path of the air inlet 10b and the air outlet 10c forms an inverted U-shape, this structure shortens the airflow distance. Simultaneously, the placement of the air inlet 10b on the lower side of the gun housing 10 makes it difficult for rainwater to flow backward into the inner cavity 10a of the gun housing 10 under the influence of gravity. The installation position of the fan 20 at the air outlet 10c ensures that the exhaust direction is controllable, avoiding a decrease in heat dissipation efficiency due to turbulent airflow.

[0038] Compared to existing technologies, traditional solutions employ a vertical layout with a high-positioned air inlet 10b and a low-positioned air outlet 10c, requiring airflow to traverse the entire length of the gun body. This solution places the air inlet 10b and air outlet 10c on the lower side of the gun casing, creating a vertical airflow circulation on the same horizontal plane. This layout not only reduces the airflow path length but also enhances air exchange efficiency through the directional airflow guidance of the fan 20. With the air inlet 10b positioned on the lower side of the gun casing 10, rainwater flowing along the outer wall of the gun body is blocked by the edge of the air inlet 10b, reducing the risk of infiltration. Simultaneously, the low-positioned air inlet 10b reduces the amount of high-altitude suspended dust drawn in.

[0039] Through the above technical solutions, this application effectively reduces the risk of rainwater intruding into the inner cavity 10a of the gun housing 10 and improves the operating efficiency of the heat dissipation system. The optimization of the airflow circulation path shortens the heat exchange time, ensuring that the temperature rise of electronic components is controlled within a safe range. The improvement of the air inlet 10b position reduces the probability of dust accumulation and extends the equipment maintenance cycle. The directional airflow function of the fan 20 enhances airflow stability and avoids the problem of local overheating caused by airflow turbulence in traditional solutions.

[0040] Please see Figures 1 to 3 This application further proposes that the gun casing 10 includes a main casing 11 and at least one side casing 12, the side casing 12 is disposed on the outer side wall of the main casing 11, and the lower side of the side casing 12 and the main casing 11 enclose each other to form an air inlet 10b.

[0041] The main housing 11 refers to the main structure of the charging gun, and its outer wall is used to support the installation of the side housing 12. The interior of the main housing 11 forms a cavity to accommodate the fan 20 and electronic components. The side housing 12 refers to an additional housing structure that is independent of the main housing 11. Specifically, it can be fixed to the side of the main housing 11 by bolts or clips, or the main housing 11 and the side housing 12 can be integrally formed. The air inlet 10b refers to the airflow inlet arranged on the lower side of the side housing 12.

[0042] The side shell 12 forms a low-level air intake channel through the air inlet 10b located on its lower side, ensuring that the direction of outside air intake is lower than the area where electronic components are arranged inside the main shell 11. The mounting interface between the main shell 11 and the side shell 12 forms an isolation structure, preventing rainwater from flowing back up into the air inlet 10b on the lower side of the side shell 12 due to gravity when it flows down the outer wall of the main shell 11. The negative pressure generated when the fan 20 is working draws air in from the air inlet 10b on the lower side of the side shell 12, and after passing between the side shell 12 and the main shell 11, it enters the interior of the main shell 11 for heat dissipation.

[0043] This application effectively reduces the vertical height of the air inlet 10b, allowing rainwater to naturally drain downwards under gravity and preventing it from flowing back into the air inlet 10b. The combined structure of the side shell 12 and the main shell 11 forms a stepped waterproof barrier. After entering from the lower side of the side shell 12, air must pass through a bending path formed by the height difference to reach the internal electronic component area.

[0044] Please see Figures 1 to 3 Preferably, there are two side shells 12, which are located on the two outer side walls of the main shell 11.

[0045] The side shell 12 refers to a structural component that forms a closed or semi-closed space with the main shell 11. Its inner side wall maintains a predetermined distance from the outer side wall of the main shell 11 to form an airflow channel 10d. The setting of this distance must ensure that the pressure drop is controlled within a reasonable range when the airflow passes through, while avoiding the formation of turbulent regions.

[0046] Two side shells 12 are symmetrically mounted on the left and right sides of the main shell 11, forming a dual-side air intake structure. After air enters parallel from the side air inlets 10b, it forms opposing airflows within the symmetrical channel enclosed by the main shell 11 and the side shells 12. This dual-channel design allows the airflow to form a laminar flow inside the gun body, effectively reducing flow resistance. The air inlets 10b are concentrated on both sides of the lower part of the gun body, making it difficult for rainwater to enter from the horizontally distributed air inlets 10b when it flows downward along the shell surface under the action of gravity.

[0047] This design shortens the airflow path through symmetrical double-sided air intakes, allowing air to flow directly to the air outlet 10c via independent channels on both sides. This application solves the problem of low airflow efficiency caused by a single-sided air intake layout. The symmetrical arrangement of the double-sided air intakes 10b makes the airflow distribution more uniform and avoids local overheating.

[0048] Please see Figure 1 and Figure 3 This application further proposes that the outer wall of the main shell 11 and the side shell 12 enclose each other to form an airflow channel 10d, the airflow channel 10d connects the inner cavity 10a and the air inlet 10b, and the longitudinal cross-sectional shape of the airflow channel 10d is flared.

[0049] The outer wall of the main shell 11 and the side shell 12 enclose an airflow channel 10d, meaning that the space between the main shell 11 and the side shell 12 forms a continuous airflow path. This airflow channel 10d forms a directional airflow guiding structure to reduce resistance during airflow. The longitudinal cross-sectional shape of the airflow channel 10d is flared, meaning that the cross-sectional area of ​​the airflow channel 10d gradually increases along the vertical direction. This can be achieved by designing the inner wall of the side shell 12 as an outwardly inclined curved or sloping surface. This structure utilizes the airflow acceleration effect to enhance heat dissipation while simultaneously guiding droplet discharge.

[0050] The longitudinal cross-sectional shape of the airflow channel 10d is flared, which gradually widens the airflow channel 10d in the vertical direction, using the Venturi effect to accelerate airflow and enhance heat dissipation efficiency. At the same time, the flared structure guides the airflow direction through inclination or curvature, causing droplets to flow outward along the inner wall of the channel under the action of gravity, thus preventing droplets from accumulating in the channel.

[0051] Please see Figure 1 and Figure 3 This application further proposes that at least one side of the airflow channel 10d is an arc surface.

[0052] A curved surface refers to a channel sidewall structure with an arc-shaped curvature, which can be achieved using a semi-circular, parabolic, or continuously curving curved surface structure. This structure eliminates the abrupt changes in flow resistance caused by right-angle turns, allowing the airflow to transition smoothly along the curved surface.

[0053] When air flows over the curved surface, the airflow boundary layer extends along the curved surface, avoiding flow separation caused by right-angle structures. Droplets, driven by the airflow, move along the curved surface towards the outlet 10c and are accelerated out through the capillary action path formed by the guide indentation. Simultaneously, the continuous smooth surface of the curved surface reduces the unevenness of the wall structure, making it less likely for dust particles to deposit under the shear force of the airflow, thus maintaining the effective ventilation area of ​​the channel cross-section.

[0054] This application enables efficient discharge of droplets within the channel, preventing the risk of electrical short circuits caused by water accumulation, while also reducing the problem of decreased heat dissipation efficiency due to dust adhesion, ensuring the long-term stable operation of the air-cooled system.

[0055] Please see Figure 1 and Figure 3This application further proposes to provide flow-guiding indentations on the arc surface of the airflow channel 10d, which are used to guide droplets out of the air inlet 10b. The flow-guiding indentations refer to recessed patterns on the arc surface, which can be implemented using transverse grooves, spiral grooves, or wavy texture structures. The flow-guiding indentations form a directional drainage path through surface tension and droplet gravity, while simultaneously increasing the contact disturbance between the airflow and the wall surface.

[0056] When airflow containing droplets enters the flared channel, boundary layer separation occurs in the arc-shaped area. The guide grooves alter surface wetting properties, creating a contact angle difference between the droplets at the groove edges, thus generating a surface tension gradient pointing towards the inlet 10b. Guided by the grooves, the droplets move along a predetermined path and are eventually discharged from the inlet 10b. This process creates a flow counter-current to the airflow direction, but the shallow groove structure of the grooves does not significantly increase airflow resistance. The density of the guide grooves gradually decreases along the airflow direction, balancing the requirements for liquid removal and airflow stability.

[0057] Please see Figure 1 and Figure 3 This application further proposes that the gun casing 10 also includes a bottom casing 13, which is located on the bottom wall of the main casing 11. The fan 20 is installed inside the bottom casing 13, and the bottom casing 13 is provided with an air outlet 10c.

[0058] The bottom shell 13 refers to an independent shell structure connected to the bottom of the main shell 11. It can be integrally molded using injection molding or fixed by bolts. Its internal space is used to accommodate the fan 20. The air outlet 10c refers to a ventilation opening provided on the side wall or bottom of the bottom shell 13, used to guide airflow out.

[0059] This design integrates the air outlet 10c into the bottom of the base shell 13, allowing rainwater entering the outlet 10c to flow out naturally under gravity, preventing accumulation within the cavity. Furthermore, in existing technologies, the fan 20 is typically installed inside the main housing 11, causing the airflow path to pass through multiple bends. This design, however, uses an independent structure in the base shell 13 to ensure a straight airflow path, reducing turbulence.

[0060] Please see Figure 3 and Figure 4 This application further proposes that the air-cooled DC charging gun also includes a gun head assembly 30, which includes: a gun head shell 31, which is detachably connected to the gun shell 10; a mounting member 32, which is detachably connected to the gun head shell 31 and is used to install DC pin terminals; and a heat-conducting block 33, which is connected to the mounting member 32 and abuts against the DC pin terminals.

[0061] The gun head shell 31 refers to the shell structure covering the electrical components at the front end of the charging gun, forming an external protective barrier through a detachable design. The mounting component 32 refers to the positioning component that carries the DC pin terminals, which can be implemented using a metal frame structure with threaded holes, forming an internal isolation layer through independent installation. The heat-conducting block 33 refers to the solid medium for transferring heat, which can be implemented using copper alloy or aluminum-based composite materials, establishing a heat conduction path through rigid contact.

[0062] The detachable connection between the gun head housing 31 and the gun housing 10 is configured to form a waterproof interface through the cooperation of a sealing ring and a slot. When external moisture seeps in along the gaps in the gun housing 10, the sealing ring can prevent moisture from entering the gun head housing 31. The detachable installation of the mounting component 32 within the gun head housing 31 is configured to utilize a limiting boss that fits with the inner wall of the gun head housing 31 to form a dust blocking area. When external airflow carries dust in, the limiting boss can trap particles to prevent them from contacting the DC pin terminals. The heat-conducting block 33 is configured to be rigidly connected to the mounting component 32 through a stepped contact surface, while simultaneously abutting the end of the DC pin terminal in a planar contact manner. When the terminal generates heat due to current transmission, the heat is conducted to the heat-conducting block 33 through the contact surface, and then dissipated through convection between the surface of the heat-conducting block 33 and the air.

[0063] This solution uses a detachable gun head shell 31 to form an independent maintenance unit. The mounting part 32 and the heat-conducting block 33 are combined to form a directional heat dissipation channel, which can not only achieve periodic cleaning of internal dust, but also avoid the negative impact of colloid filling on heat dissipation efficiency.

[0064] Please see Figure 3 and Figure 4 This application further proposes that the mounting component 32 includes a retaining ring 321 and a pressure plate 322, which are detachably connected to the gun head housing 31 in sequence, and the heat-conducting block 33 is disposed between the retaining ring 321 and the pressure plate 322.

[0065] The retaining ring 321 is an annular positioning component whose outer diameter forms an interference fit with the inner wall of the gun head housing 31, providing an axial positioning reference for the pressure plate 322. The pressure plate 322 is a plate-shaped fixing component with a through hole, the edge of which is provided with a limiting boss for elastically pressing the heat-conducting block 33. The detachable connection refers to a non-permanent assembly method, which can be achieved using threaded fastening or snap-fit ​​engagement, creating a reversible disassembly and reassembly relationship between the retaining ring 321 and the gun head housing 31. The heat-conducting block 33, located between the retaining ring 321 and the pressure plate 322, ensures that the heat-conducting medium is confined within the sealed space formed by the two fixed structures. Specifically, a rectangular copper block can be used to form surface contact with the bottom surface of the pressure plate 322, utilizing the pre-tightening force generated by the downward deformation of the pressure plate 322 to maintain contact pressure.

[0066] This solution, through the combined design of the split retaining ring 321 and the pressure plate 322, not only enables graded control of axial pressure, but also allows for the replacement of the heat-conducting block 33 by disassembling the pressure plate 322 without removing the retaining ring 321, significantly shortening maintenance time.

[0067] Please see Figure 3 and Figure 4 This application further proposes that the gun head shell 31 is filled with thermally conductive adhesive.

[0068] The charging head shell 31 refers to the outer shell component that constitutes the front end structure of the charging gun. It is used to house the mounting component 32 and internal components such as the DC pin terminals, and forms a sealed fit with the charging head shell 10 through a detachable connection. Thermally conductive adhesive refers to a filler material with thermal conductivity properties. Specifically, it can be a silicone-based thermally conductive adhesive or an epoxy resin-based thermally conductive adhesive. After curing, it forms an elastic thermally conductive bonding layer that connects the DC pin terminals and the heat-conducting block 33.

[0069] The thermally conductive adhesive, in its liquid state, is injected into the cavity at the tail of the nozzle housing 31, encapsulating components such as the mounting component 32, DC pin terminals, and heat-conducting block 33. The cured adhesive fills the gap between the DC pin terminals and the heat-conducting block 33, eliminating channels for liquid to seep in from the outside along the assembly gaps. Simultaneously, through direct contact with the mounting component 32 and the DC pin terminals, the thermally conductive adhesive rapidly dissipates heat generated during operation via convection between the nozzle housing 31 and the external air, preventing charging power limitations due to excessively high local temperatures.

[0070] Through the above technical solution, the thermally conductive adhesive filling in this application can effectively prevent external liquids from entering the DC pin terminals and the interior of the heat-conducting block 33 assembly, avoiding the risk of electrical short circuits. Simultaneously, by establishing a continuous heat-conducting channel, heat dissipation efficiency is improved, ensuring the stability of the charging gun under prolonged high-power operation.

[0071] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A wind-cooled DC charging gun, characterized in that, The air-cooled DC charging gun includes: A gun casing, the gun casing having an inner cavity and an air inlet and an air outlet communicating with the inner cavity, the air inlet and the air outlet being spaced apart, and both the air inlet and the air outlet being located on the lower side of the gun casing; and A fan is installed in the inner cavity and located at the air outlet; the fan is used to guide the air entering from the air inlet to the air outlet.

2. The air-cooled DC charging gun as described in claim 1, characterized in that, The gun casing includes a main casing and at least one side casing. The side casing is disposed on the outer side wall of the main casing, and the lower side of the side casing and the main casing together form the air inlet.

3. The air-cooled DC charging gun as described in claim 2, characterized in that, The outer wall of the main housing and the side shell enclose each other to form an airflow channel, the airflow channel connects the inner cavity and the air inlet, and the longitudinal cross-sectional shape of the airflow channel is flared.

4. The air-cooled DC charging gun as described in claim 3, characterized in that, At least one side of the airflow channel is an arc surface.

5. The air-cooled DC charging gun as described in claim 4, characterized in that, The arc surface is provided with a flow-guiding indentation, which is used to guide droplets to flow out from the air inlet.

6. The air-cooled DC charging gun as described in claim 2, characterized in that, The gun casing also includes a bottom shell, which is disposed on the bottom wall of the main casing. The fan is installed inside the bottom shell, and the bottom shell is provided with the air outlet.

7. The air-cooled DC charging gun as described in claim 1, characterized in that, The air-cooled DC charging gun also includes a gun head assembly, which includes: Gun head shell, wherein the gun head shell is detachably connected to the gun shell; Mounting component, detachably connected to the nozzle housing, used for mounting DC pin terminals; and A heat-conducting block is connected to the mounting component and abuts against the DC pin terminal.

8. The air-cooled DC charging gun as described in claim 7, characterized in that, The mounting component includes a retaining ring and a pressure plate, which are detachably connected to the gun head housing in sequence, and the heat-conducting block is disposed between the retaining ring and the pressure plate.

9. The air-cooled DC charging gun as described in claim 7, characterized in that, The gun head shell is filled with thermally conductive adhesive.

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