Liquid cooling device for DC terminal of DC charging gun

Abstract

The utility model relates to the technical field of charging guns, in particular to a liquid cooling device for DC terminals of a DC charging gun, which comprises a gun head shell and two DC terminals, the front section of each DC terminal is inserted into the inner cavity of the gun head shell, the middle section of each DC terminal is sleeved with a terminal pressing plate, and the terminal pressing plate covers the rear end of the gun head shell and is in buckled connection with the gun head shell. The rear sections of the two DC terminals are sleeved with liquid cooling sleeves, the liquid cooling sleeves are connected with the terminal pressing plates in a buckled mode, and the rear ends of the DC terminals are connected with conductive connectors. A closed cavity between the liquid cooling sleeve and the DC terminal forms a liquid cooling outer channel, the interior of the DC terminal is hollow to form a liquid cooling inner channel, and a liquid cooling agent circularly flows between the liquid cooling outer channel and the liquid cooling inner channel in the charging process to cool the DC terminal. The direct current charging gun can effectively solve the technical problems that in the charging process of an existing direct current charging gun, a DC terminal is prone to overheating, and the temperature of a conductive jack is high, so that potential safety hazards exist.

Description

Technical Field

[0001] The utility model relates to the technical field of charging guns, and in particular to a liquid cooling device for a DC terminal of a DC charging gun. Background Art

[0002] The DC terminal in a traditional DC charging cable connects to the power source of an external charging station via an integrated cable. This dry-type integrated cable typically consists of 70 mm² flexible conductors capable of carrying a maximum DC charging current of 250A. Charging currents exceeding 250A can cause the dry-type cable and DC terminal to overheat during charging, causing the conductive socket to overheat and potentially posing a fire hazard. Increasing the size of the conductive socket in a DC charging cable to improve its current-carrying capacity would inevitably increase the overall weight of the charging cable, increasing costs and creating inconvenience in actual use. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a liquid cooling device for the DC terminal of a DC charging gun, which is easy to install and has a good cooling effect. The circulating liquid coolant takes away the heat generated by the DC terminal and the cable connection during the charging process, which can effectively solve the technical problem that the DC terminal of the existing DC charging gun overheats and cannot be cooled in time during charging.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] In one technical solution of the present invention, a liquid cooling device for a DC terminal of a DC charging gun is provided, comprising a gun head housing and two DC terminals. The front end of the DC terminal is inserted into the inner cavity of the gun head housing, and the middle end of the DC terminal is covered with a terminal pressure plate. The terminal pressure plate is covered with a rear end of the gun head housing and is snap-connected to the rear end of the gun head housing.

[0006] The rear ends of the two DC terminals are externally sheathed with liquid cooling sleeves, which are snap-connected to the terminal pressure plate, and the rear ends of the DC terminals are connected to conductive connectors; the closed cavity between the liquid cooling sleeves and the DC terminals forms an external liquid cooling channel, and the internal hollow space of the DC terminals forms an internal liquid cooling channel, and the external liquid cooling channel and the internal liquid cooling channel are connected for circulating liquid coolant.

[0007] By adopting the above technical solution, the DC terminal is fixed in the gun head shell by snap-fitting the terminal pressure plate and the liquid cooling sleeve with the gun head shell. A liquid cooling outer channel is formed by sleeved on the outside of the DC terminal, and a liquid cooling inner channel is opened inside the DC terminal. Liquid coolant circulates in the liquid cooling outer channel and the liquid cooling inner channel, thereby quickly cooling the DC terminal and the cable connection during the charging process, so that the charging gun can carry high-power current, improve the charging efficiency of the charging gun, and shorten the charging time.

[0008] In a possible embodiment, each DC terminal has at least two liquid-cooling holes on its sidewall for connecting an outer liquid-cooling channel with an inner liquid-cooling channel. Liquid coolant circulates between the outer and inner liquid-cooling channels through the liquid-cooling holes to prevent overheating of the DC terminal during charging.

[0009] In a possible embodiment, the gun head housing is provided with a first jack and a second jack, the DC terminal includes a DC+ terminal and a DC- terminal, and the liquid cooling sleeve includes a first sleeve and a second sleeve;

[0010] The front section of the DC+ terminal is inserted into the first jack, the middle section is connected to the terminal pressure plate, and the rear section is sleeved in the first sleeve; the front section of the DC- terminal is inserted into the second jack, the middle section is connected to the terminal pressure plate, and the rear section is sleeved in the second sleeve.

[0011] In a possible embodiment, a connecting portion is integrally formed between the first sleeve and the second sleeve, and a liquid inlet and a liquid outlet connected to the liquid-cooling external channel are provided on the connecting portion, which are used to transport and output refrigerant into and out of the liquid-cooling external channel to form a liquid cooling cycle, thereby ensuring that the coolant forms an inflow and outflow loop, and the heat generated on the surface of the DC terminal during charging is promptly removed by the flowing coolant for rapid cooling, thereby avoiding accidents caused by high temperature of the DC terminal.

[0012] In a possible embodiment, a first boss is formed around the inner wall surface of the rear end of the liquid cooling sleeve. The first boss is sleeved onto the exterior of the DC terminal. The conductive connector is threadedly connected to the rear end of the DC terminal while abutting the first boss, and the rear end of the conductive connector extends out of the liquid cooling sleeve. By providing the conductive connector with connection to the DC terminal while abutting the first boss, the DC terminal's installation stability within the liquid cooling sleeve is ensured.

[0013] In a possible embodiment, a first sealing sleeve is provided between the first boss and the DC terminal to improve the sealing of the connection between the two and ensure that the liquid coolant in the liquid-cooling external channel does not leak out; the conductive connector is inserted into the rear port of the DC terminal, and a sealing gasket is fitted between the conductive connector and the rear end surface of the DC terminal to ensure the sealing of the conductive connector threaded connection to the DC terminal.

[0014] In a possible embodiment, a second boss is formed on the inner wall of the front end of the liquid-cooling sleeve. The second boss is mounted on the exterior of the DC terminal. A second sealing sleeve is fitted between the second boss and the DC terminal to improve the sealing of the connection between the two and prevent the leakage of liquid coolant in the liquid-cooling external channel. The provision of the second boss ensures sufficient space in the liquid-cooling external channel between the liquid-cooling sleeve and the DC terminal to ensure the circulation of liquid coolant, thereby improving the cooling effect.

[0015] In a possible embodiment, an annular groove and a positioning flange are provided on the outer circumferential surface of the middle section of the DC terminal, an O-ring is sleeved in the annular groove, and the O-ring is located between the gun head shell and the DC terminal to form an interference fit with the two, so as to improve the sealing of the connection between the gun head shell and the DC terminal, and the front end of the liquid cooling sleeve is in contact with the positioning flange.

[0016] In a possible implementation manner, a stop block is abutted between the positioning flange and the gun head housing, and the stop block is engaged with an outer side surface of the DC terminal.

[0017] In a possible embodiment, a card slot is provided on the outer surface of the liquid cooling sleeve, and a card hook matching the card slot is provided on the terminal pressure plate to snap-fit ​​and fix the liquid cooling sleeve and the terminal pressure plate; a slot hole is provided on the rear end side surface of the gun head shell, and a card block matching the slot hole is provided on the terminal pressure plate to snap-fit ​​and fix the terminal pressure plate and the gun head shell.

[0018] The beneficial effects of the utility model are as follows:

[0019] The liquid cooling device for the DC terminal of a DC charging gun provided by the utility model has a simple structure, occupies a small space, is easy to install, and has a good cooling effect. The DC terminal is fixed in the gun head shell by arranging a terminal pressure plate and a liquid cooling sleeve to be snap-connected with the gun head shell; a liquid cooling outer channel is formed by arranging a liquid cooling sleeve on the outside of the DC+ and DC- terminals, and a liquid cooling inner channel is opened inside the DC terminal. By arranging a liquid inlet, a liquid outlet and a liquid cooling through hole, a liquid coolant is circulated in the liquid cooling outer channel and the liquid cooling inner channel, so that the heat generated by the DC terminal during the charging process is taken away in time, and the temperature is quickly reduced, which makes it easier for the charging gun to carry high-power current, improves the charging efficiency of the charging gun, and shortens the charging time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the liquid cooling device for the DC terminal of the DC charging gun;

[0022] Figure 2 This is another three-dimensional structural schematic diagram of the liquid cooling device for the DC terminal of the DC charging gun;

[0023] Figure 3 This is a partially cutaway schematic diagram of the liquid cooling device for the DC terminal of a DC charging gun.

[0024] Figure 4 yes Figure 3A partial enlarged view of the “A” in the middle;

[0025] Figure 5 This is a side view of the liquid cooling device for the DC terminal of the DC charging gun;

[0026] Figure 6 yes Figure 5 Schematic diagram of the cross-section structure along the "BB" line;

[0027] Figure 7 This is a schematic diagram of the exploded structure of the liquid cooling device for the DC terminal of the DC charging gun.

[0028] Description of the numbers in the figure:

[0029] 1. Gun head shell; 11. First socket; 12. Second socket; 13. Slot; 2. DC terminal; 21. DC+ terminal; 22. DC- terminal; 23. Liquid cooling through hole; 24. Annular groove; 25. Positioning flange; 26. O-ring; 27. Stop block; 3. Terminal pressure plate; 31. Hook; 32. Block; 4. Conductive connector; 5. Liquid cooling sleeve; 51. First sleeve; 52. Second sleeve; 53. Connecting part; 54. First boss; 55. Second boss; 56. Slot; 57. Liquid inlet; 58. Liquid outlet; 6. Liquid cooling outer channel; 7. Liquid cooling inner channel; 8. First sealing sleeve; 9. Second sealing sleeve; 10. Sealing gasket. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand the other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of the present invention are limited to the embodiment.

[0031] In the description of this embodiment, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "front", "back", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to has a specific orientation, is constructed and operates in a specific orientation. Therefore, they should not be understood as limiting the utility model. The terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0032] In the description of this embodiment, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on their specific circumstances.

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] like Figures 1 to 3 As shown, in one embodiment of the present invention, a liquid cooling device for DC terminals of a DC charging gun is provided. The device comprises a gun head housing 1 and two DC terminals 2. The front ends of the DC terminals 2 are inserted into the inner cavity of the gun head housing 1. The middle ends of the DC terminals 2 are externally sleeved with a terminal pressure plate 3. The terminal pressure plate 3 covers the rear end of the gun head housing 1 and is snap-connected thereto to restrict the position of the DC terminals 2 within the gun head housing 1. The rear ends of the two DC terminals 2 are externally sleeved with a liquid cooling sleeve 5, which is snap-connected to the terminal pressure plate 3. The rear ends of the DC terminals 2 are connected to a conductive connector 4. The enclosed cavity between the liquid cooling sleeve 5 and the DC terminals 2 forms an external liquid cooling channel 6. The hollow interior of the DC terminals 2 forms an internal liquid cooling channel 7. The external liquid cooling channel 6 and the internal liquid cooling channel 7 are connected to each other for circulating liquid coolant, thereby rapidly cooling the DC terminals 2 and the cable connection during charging, thereby facilitating the charging gun to carry high-power currents, improving charging efficiency, and shortening charging time.

[0035] refer to Figure 3 and Figure 6 At least two liquid cooling holes 23 are provided on the side wall of each DC terminal 2, which are used to connect the liquid cooling outer channel 6 and the liquid cooling inner channel 7, so that the liquid coolant can circulate between the liquid cooling outer channel 6 and the liquid cooling inner channel 7 through the liquid cooling holes 23, thereby timely cooling the DC terminal.

[0036] refer to Figure 1 and Figure 5 The gun head shell 1 is provided with a first jack 11 and a second jack 12, and the DC terminal 2 includes a DC+ terminal 21 and a DC- terminal 22. Figure 5 and Figure 7The liquid cooling sleeve 5 includes a first sleeve 51 and a second sleeve 52. The front end of the DC+ terminal 21 is inserted into the first socket 11, the middle end is connected to the terminal pressure plate 3, and the rear end is sleeved within the first sleeve 51. The front end of the DC- terminal 22 is inserted into the second socket 12, the middle end is connected to the terminal pressure plate 3, and the rear end is sleeved within the second sleeve 52. A connecting portion 53 is integrally formed between the first sleeve 51 and the second sleeve 52. The connecting portion 53 is provided with a liquid inlet 57 and a liquid outlet 58 connected to the liquid cooling external channel 6, which are used to transport refrigerant into and out of the liquid cooling external channel 6 to form a liquid cooling cycle, rapidly cooling the DC terminal.

[0037] refer to Figure 3 and Figure 6 A first boss 54 is provided on the inner wall surface of the rear end of the liquid cooling sleeve 5. The first boss 54 is sleeved on the outside of the DC terminal 2. The conductive connector 4 is inserted into the rear port of the DC terminal 2 and connected to it through a thread. At the same time, the conductive connector 4 abuts against the outer side of the first boss 54 to lock and fix the position of the DC terminal 2 in the liquid cooling sleeve 5. The rear part of the conductive connector 4 extends out of the liquid cooling sleeve 5 for connecting the charging cable.

[0038] refer to Figure 3 and Figure 6 A first sealing sleeve 8 is provided between the first boss 54 and the DC terminal 2 to improve the sealing of the connection between the two and ensure that the liquid coolant in the liquid-cooling outer channel 6 does not leak out; the conductive connector 4 is inserted into the rear port of the DC terminal 2, and a sealing gasket 10 is fitted between the rear end surface of the conductive connector 4 and the DC terminal 2 to ensure the sealing of the threaded connection of the conductive connector 4 to the DC terminal 2.

[0039] refer to Figure 3 and Figure 4 A second boss 55 is provided on the inner wall surface of the front end of the liquid cooling sleeve 5. The second boss 55 is sleeved on the outside of the DC terminal 2. A second sealing sleeve 9 is fitted between the second boss 55 and the DC terminal 2 to improve the sealing performance of the connection between the two and ensure that the liquid coolant in the liquid cooling outer channel 6 does not leak out. Figure 6 and Figure 7 An annular groove 24 and a positioning flange 25 are formed on the outer circumference of the middle section of the DC terminal 2. An O-ring 26 is sleeved within the annular groove 24. The O-ring 26 is positioned between the gun head housing 1 and the DC terminal 2, forming an interference fit with both, thereby improving the sealing of the connection between the gun head housing 1 and the DC terminal 2. The front end of the liquid cooling sleeve 5 abuts the positioning flange 25. The first and second sealing sleeves 8 and 9 have L-shaped cross-sections and are fitted over the exterior of the DC terminal, respectively covering the outside of the first and second bosses 54 and 55 to improve the sealing of the connection. A stop block 27 also abuts between the positioning flange 25 and the gun head housing 1. The stop block 27 engages the outer surface of the DC terminal 2 to provide support and limit the connection.

[0040] refer to Figure 2 The outer surface of the liquid cooling sleeve 5 is provided with a slot 56, and the terminal pressing plate 3 has a hook 31 that matches the slot 56, which is used to snap-fit ​​the liquid cooling sleeve and the terminal pressing plate together. The rear end side of the gun head housing 1 is provided with a slot 13, and the terminal pressing plate 3 is provided with a block 32 that matches the slot 13, which is used to snap-fit ​​the terminal pressing plate and the gun head housing together.

[0041] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, those skilled in the art should understand that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the specific implementation of the present invention is not limited to these descriptions. Therefore, any technical solution that can be derived by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technologies shall fall within the scope of protection defined by the claims.

Claims

1. A liquid cooling device for a DC terminal of a DC charging gun, comprising a gun head shell (1) and two DC terminals (2), characterized in that: The front section of the DC terminal (2) is inserted into the inner cavity of the gun head shell (1), the middle section of the DC terminal (2) is sleeved with a terminal pressing plate (3), and the terminal pressing plate (3) is covered on the rear end of the gun head shell (1) and is snap-connected thereto; The rear sections of the two DC terminals (2) are externally sleeved with a liquid cooling sleeve (5), the liquid cooling sleeve (5) is snap-connected to the terminal pressing plate (3), and the rear end of the DC terminal (2) is connected to a conductive connector (4); a closed cavity between the liquid cooling sleeve (5) and the DC terminal (2) forms an external liquid cooling channel (6), the internal hollow of the DC terminal (2) forms an internal liquid cooling channel (7), and the external liquid cooling channel (6) is connected to the internal liquid cooling channel (7).

2. A liquid cooling device for a DC charging gun DC terminal according to claim 1, characterized in that: At least two liquid cooling through holes (23) are provided on the side wall of each DC terminal (2) for connecting the liquid cooling outer channel (6) with the liquid cooling inner channel (7).

3. A liquid cooling device for a DC charging gun DC terminal according to claim 1, characterized in that: The gun head shell (1) is provided with a first jack (11) and a second jack (12), the DC terminal (2) comprises a DC+ terminal (21) and a DC- terminal (22), and the liquid cooling sleeve (5) comprises a first sleeve (51) and a second sleeve (52); The front section of the DC+ terminal (21) is inserted into the first plug hole (11), the middle section is connected to the terminal pressing plate (3), and the rear section is sleeved in the first sleeve (51); the front section of the DC- terminal (22) is inserted into the second plug hole (12), the middle section is connected to the terminal pressing plate (3), and the rear section is sleeved in the second sleeve (52).

4. A liquid cooling device for a DC charging gun DC terminal according to claim 3, characterized in that: A connecting portion (53) is integrally formed between the first sleeve (51) and the second sleeve (52), and a liquid inlet (57) and a liquid outlet (58) which are connected to the liquid cooling external channel (6) are provided on the connecting portion (53).

5. The liquid cooling device for a DC charging gun DC terminal according to claim 1, characterized in that: A first boss (54) is provided on the inner wall surface of the rear end of the liquid cooling sleeve (5), the first boss (54) is sleeved on the outside of the DC terminal (2), the conductive connector (4) is threadedly connected to the rear port of the DC terminal (2) and abuts against the first boss (54), and the rear part of the conductive connector (4) extends out of the liquid cooling sleeve (5).

6. A liquid cooling device for a DC charging gun DC terminal according to claim 5, characterized in that: A first sealing sleeve (8) is sleeved between the first boss (54) and the DC terminal (2), the conductive connector (4) is inserted into the rear port of the DC terminal (2), and a sealing gasket (10) is fitted between the conductive connector (4) and the rear end surface of the DC terminal (2).

7. The liquid cooling device for a DC charging gun DC terminal according to claim 1, characterized in that: A second boss (55) is provided on the inner wall surface of the front end of the liquid cooling sleeve (5), the second boss (55) is sleeved on the outside of the DC terminal (2), and a second sealing sleeve (9) is sleeved between the second boss (55) and the DC terminal (2).

8. The liquid cooling device for a DC charging gun DC terminal according to claim 1, characterized in that: An annular groove (24) and a positioning flange (25) are provided on the outer circumferential surface of the middle section of the DC terminal (2), an O-ring (26) is sleeved in the annular groove (24), the O-ring (26) is located between the gun head shell (1) and the DC terminal (2) to form an interference fit with the two, and the front end of the liquid cooling sleeve (5) is in contact with the positioning flange (25).

9. A liquid cooling device for a DC charging gun DC terminal according to claim 8, characterized in that: A stop block (27) is abutted between the positioning flange (25) and the gun head shell (1), and the stop block (27) and the outer side surface of the DC terminal (2) are mutually clamped.

10. The liquid cooling device for a DC charging gun DC terminal according to claim 1, characterized in that: The outer surface of the liquid cooling sleeve (5) is provided with a card slot (56), and the terminal pressing plate (3) is provided with a card hook (31) that matches the card slot (56); the rear end side surface of the gun head shell (1) is provided with a slot hole (13), and the terminal pressing plate (3) is provided with a card block (32) that matches the slot hole (13).

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