Terminal liquid cooling device low in flow resistance and convenient to assemble and charging gun thereof

Abstract

The utility model discloses a terminal liquid cooling device with low flow resistance and convenient assembly and a charging gun thereof, and the terminal liquid cooling device comprises a liquid cooling support, a plurality of terminal assemblies installed on the liquid cooling support, and liquid inlet and outlet pipelines arranged corresponding to the terminal assemblies. The device is characterized in that liquid cooling sleeves which are in one-to-one correspondence with the terminal assemblies and are separated from each other are fixedly arranged on the liquid cooling bracket side by side; each terminal assembly comprises a terminal arranged in the liquid cooling sleeve in a penetrating mode, the head and the tail of the terminal extend out of the liquid cooling sleeve, the middle of the terminal is fixedly sleeved with a rubber-coated heat conduction sleeve, the front portion and the rear portion of the rubber-coated heat conduction sleeve are fixedly sleeved with terminal sealing rings attached to the inner circumferential wall of the liquid cooling sleeve, and the terminal sealing rings and the inner circumferential wall of the liquid cooling sleeve form a sealed liquid cooling inner cavity surrounding the rubber-coated heat conduction sleeve. The liquid cooling sleeve is provided with a liquid inlet connector and a liquid outlet connector which are communicated with the sealed liquid cooling inner cavity, and quick connectors are pressed into the liquid inlet connector and the liquid outlet connector respectively and used for inserting and fixing a liquid inlet pipeline and a liquid outlet pipeline respectively. The terminal liquid cooling device and the charging gun thereof have the advantages that the flow resistance of the internal liquid cooling flow channel is small, the overall assembly is convenient, and the cooling efficiency is high.

Description

Technical Field

[0001] The utility model discloses a terminal liquid cooling device with low flow resistance and easy assembly, and a charging gun thereof. Background Art

[0002] With the increasing popularity of new energy vehicles, the use of high-power DC charging cables is becoming increasingly popular. It's well known that when charging with a charging cable, especially during fast charging, the (power) terminals on the inside of the charging cable head generate high heat. If this isn't cooled and controlled promptly, this can lead to a decrease in charging efficiency, triggering the charging cable's temperature control to cut off charging, or even causing the charging cable to burn and become damaged. For this reason, more and more charging cables are now being designed with dedicated terminal liquid cooling devices or structures to cool the terminals, better controlling the charging temperature and improving both charging efficiency and safety.

[0003] The basic structure of terminal liquid cooling systems currently available on the market mainly consists of a cooling shell for mounting and securing the terminals. The cooling shell is designed with a liquid cooling channel designed to flow through the terminals. The cooling shell is also equipped with a liquid inlet and outlet connectors on the outside of the cooling shell, which are connected to the internal liquid cooling channel and are used to connect to the inlet and outlet pipes respectively. Known charging guns often have multiple terminals depending on the implementation standard and power design. To enhance the cooling efficiency of each terminal, the terminal liquid cooling system is usually equipped with a corresponding liquid cooling system for each terminal.

[0004] However, the existing terminal liquid cooling device has the following problems during use:

[0005] 1. The liquid cooling channel inside the entire terminal liquid cooling device is long and has a large flow resistance, which causes the pressure of the gun line to be too high. The high pressure operation of the gun line will affect the life of the entire cooling circulation system.

[0006] There are two reasons for this. First, existing terminal liquid cooling systems typically design the inlet and outlet connectors as plug-in connections with a relatively small inner diameter, which are connected by inserting into a liquid pipeline. Because the inner diameter of this plug-in connection structure is typically smaller than that of the liquid pipeline, this results in excessive flow resistance and pressure in the liquid cooling channel within the device. Second, the inlet and outlet connectors must also connect to the intermediate distribution channel built into the cooling housing, which in turn connects to the liquid cooling channel flowing through the terminal through the intermediate distribution channel, resulting in a tortuous and excessively long flow path.

[0007] Taking the patent application "A High-efficiency Charging Plug Cooling Structure and Charging Connector" with publication number 114554797A as an example, the problem is that a pagoda head structure is used to connect the water pipe. The diameter of the water channel inside the connector is limited by the inner diameter of the pagoda head, and the outer ring of the pagoda head is inserted into the inner diameter of the water pipe. Therefore, the inner diameter of the pagoda head will be smaller than the inner diameter of the water pipe, causing the water channel size inside the connector to be smaller than the inner diameter of the water pipe, resulting in higher pressure; and the use of an intermediate distribution system such as a connector and a accommodating cavity extends the flow channel length.

[0008] 2. The entire terminal liquid cooling device has many parts and a complex structure, making installation and disassembly difficult.

[0009] For example, the utility model patent with publication number 219761774U discloses a dual-inlet and dual-outlet water-cooled DC terminal assembly and a national standard DC charging gun. In addition to the above-mentioned problem of the inlet and outlet liquid joints using a pagoda head structure resulting in high internal flow resistance and pressure, the positioning of the terminals and the construction of the internal water cooling system also rely on a large number of structures such as bushings, sealing clamps and raised brackets, resulting in a complex structure, a large number of parts, and complex assembly. This will greatly reduce the production and assembly efficiency of the terminal liquid cooling device and its charging gun, and increase maintenance costs.

[0010] In addition, existing terminal liquid cooling devices often have uneven internal liquid cooling channel designs and often partially wrap the terminals, resulting in poor cooling effects at the terminals and an inability to evenly remove heat from the terminals. Summary of the Invention

[0011] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a terminal liquid cooling device which has low flow resistance, is easy to assemble, and has better cooling performance.

[0012] The technical solution of the utility model is: a terminal liquid cooling device with low flow resistance and easy assembly, comprising a liquid cooling bracket, a plurality of terminal assemblies mounted thereon, and a liquid inlet pipe and a liquid outlet pipe arranged corresponding to each terminal assembly, characterized in that a plurality of liquid cooling sleeves corresponding to the terminal assemblies and separated from each other are fixed side by side on the liquid cooling bracket; each terminal assembly includes a terminal inserted into the liquid cooling sleeve, the head and tail of the terminal both extend out of the liquid cooling sleeve, and the middle part is covered with a rubber-coated heat-conducting sleeve, the front and rear outer peripheries of the rubber-coated heat-conducting sleeve are both covered with terminal sealing rings that are tightly attached to the inner circumferential wall of the liquid cooling sleeve, and a sealed liquid cooling inner cavity surrounding the rubber-coated heat-conducting sleeve is formed between them and the inner circumferential wall of the liquid cooling sleeve; a liquid inlet joint and a liquid outlet joint that are connected to the sealed liquid cooling inner cavity are provided on the liquid cooling sleeve, a quick joint is pressed into the liquid inlet joint for the liquid inlet pipe to be inserted and fixed, and a quick joint is also pressed into the liquid outlet joint for the liquid outlet pipe to be inserted and fixed.

[0013] Furthermore, a fixing clamp is embedded in the outer periphery of the head of the terminal described in the present invention, which abuts against the front end of the liquid cooling sleeve to prevent the terminal from retreating, and a convex rib is formed on the tail of the terminal to abut against the step portion provided on the inner peripheral wall at the rear end of the liquid cooling sleeve to prevent the terminal from moving forward, thereby axially limiting and fixing the terminal in the liquid cooling sleeve.

[0014] Furthermore, the head of the terminal described in the present invention is expanded to form a replaceable terminal head fixing seat, which extends out from the front end of the liquid cooling sleeve, and its outer periphery is provided with an embedding groove for embedding the fixed clamping ring, and at the same time, the replaceable terminal head fixing seat is radially provided with a temperature sensor positioning hole for inserting a fixed temperature sensor; and the tail of the terminal is expanded to form a cable fixing seat for fixing the cable, which extends out from the rear end of the liquid cooling sleeve, and the convex rib is formed at the front part of the cable fixing seat; the rubber-coated thermal sleeve is located between the replaceable terminal head fixing seat and the cable fixing seat in the axial direction of the terminal.

[0015] Furthermore, a stop protrusion is fixed on the fixed clamp ring in the utility model, and a stop groove is formed on the front end of the liquid cooling sleeve to cooperate with the stop protrusion to prevent the fixed clamp ring from rotating, thereby enhancing the positioning stability of the fixed clamp ring and the terminal.

[0016] Furthermore, the liquid inlet joint of the present invention is provided with an L-shaped liquid inlet channel, which includes a horizontal liquid inlet channel parallel to the liquid cooling sleeve and a vertical liquid inlet channel connecting the horizontal liquid inlet channel and the sealed liquid cooling inner cavity. At the same time, a liquid inlet process hole that is connected to the vertical liquid inlet channel is opened on the liquid inlet joint (its function is to facilitate the process processing of the vertical liquid inlet channel), and the liquid inlet process hole is sealed by a liquid inlet process hole sealing gasket locked by a screw; similarly, an L-shaped liquid outlet channel is provided in the liquid outlet joint, which includes a horizontal liquid outlet channel parallel to the liquid cooling sleeve and a vertical liquid outlet channel connecting the horizontal liquid outlet channel and the sealed liquid cooling inner cavity. At the same time, a liquid outlet process hole that is connected to the vertical liquid outlet channel is opened on the liquid outlet joint (its function is to facilitate the process processing of the vertical liquid outlet channel), and the liquid outlet process hole is sealed by a liquid outlet process hole sealing gasket locked by a screw.

[0017] Furthermore, the liquid inlet joint and the liquid outlet joint on each of the liquid cooling sleeves in the present invention are staggered along the axial direction of the liquid cooling sleeve so that the cooling medium can fully flow through the surface of the rubber-coated heat-conducting sleeve to enhance the cooling and heat dissipation effect.

[0018] Furthermore, the outer periphery of the rubber-coated heat-conducting sleeve in the present invention is formed with spiral guide ribs to enhance the flow uniformity of the cooling medium around the rubber-coated heat-conducting sleeve, so that the terminal can be fully cooled and dissipated.

[0019] Furthermore, the outer periphery of the terminal sealing ring in the present invention is formed with double sealing ribs, which are used to enhance the sealing performance of the sealed liquid cooling cavity and prevent leakage.

[0020] Another object of the present utility model is to provide a charging gun, including a gun head assembly, characterized in that the gun head assembly includes a terminal liquid cooling device with low flow resistance and easy assembly involved in any of the above solutions.

[0021] Furthermore, the gun head assembly also includes replaceable terminal heads corresponding one to one with the terminals, as well as a gun head main board shell and a replaceable gun head panel fixed on the front of the gun head main board shell. The liquid cooling bracket is fixed to the rear of the gun head main board shell. The gun head main board shell is provided with a main board shell terminal hole for the terminal head to extend out corresponding to each terminal. The replaceable terminal head is fixed to the corresponding terminal head, and a terminal head pressing sleeve is formed on the replaceable gun head panel to be covered on the replaceable terminal head; and a gun head sealing gasket corresponding to each replaceable terminal head is clamped between the gun head main board shell and the replaceable gun head panel.

[0022] The advantages of adopting the technical solution of this utility model are as follows:

[0023] 1. The terminal liquid cooling device provided by the present invention eliminates the intermediate flow channel distribution structure and directly connects the inlet and outlet joints to the sealed liquid cooling inner cavity used to cool the terminals, thereby shortening the overall flow channel length. At the same time, quick connectors are pressurized inside the inlet and outlet joints, and the inlet and outlet pipes are directly inserted into the quick connectors inside the inlet and outlet joints to complete the connection, rather than using an insert-type structure (such as a pagoda head) provided on the inlet and outlet joints to insert them into the inlet and outlet pipes respectively as in conventional technology. In comparison, since the inner diameters of the inlet and outlet joints are larger than the inner diameters of the inlet and outlet pipes, low flow resistance is achieved and the internal pressure of the flow channel is reduced, which not only helps to increase the flow rate and improve the liquid cooling effect, but also helps to extend the service life of the entire terminal liquid cooling device.

[0024] 2. The terminal liquid cooling device provided by the present invention has a simple overall structure and few parts. The terminal is directly inserted into the corresponding liquid cooling sleeve of the liquid cooling bracket. The axial limit fixation can be achieved by means of the fixing clamp on the terminal head and the head of the liquid cooling sleeve, as well as the limiting cooperation between the convex rib at the terminal tail and the step portion of the inner peripheral wall at the rear end of the liquid cooling sleeve; in addition, the inlet and outlet pipes can be quickly connected with the help of the quick connectors provided in the inlet and outlet joints, so the installation and disassembly are extremely convenient, which can greatly improve the production and assembly efficiency of the terminal liquid cooling device and its charging gun, and reduce maintenance costs.

[0025] 3. In this invention, a sealed liquid-cooling cavity surrounds the rubber-coated thermal sleeve within the liquid-cooling sleeve. Spiral ribs are formed on the outer periphery of the rubber-coated thermal sleeve to enhance the uniformity of the cooling medium's flow around the sleeve, ensuring adequate cooling and heat dissipation of the terminal. Furthermore, dual sealing ribs are formed on the outer periphery of the terminal sealing rings at the front and rear of the rubber-coated thermal sleeve to enhance the sealing of the sealed liquid-cooling cavity and prevent leakage.

[0026] 4. The charging gun of the present invention has a convenient fixation between the gun head assembly and the liquid cooling bracket in the terminal liquid cooling device, and the gun head assembly integrates the functions of a replaceable terminal head and a replaceable gun head panel, which can enhance the protection of the terminal and the gun head mainboard shell.

[0027] The objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the terminal liquid cooling device of the present invention in an assembled state;

[0029] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the terminal liquid cooling device with the liquid cooling bracket, terminal assembly, and inlet and outlet pipes disassembled;

[0030] Figure 3 yes Figure 1 Schematic diagram of the separate three-dimensional structure of the liquid cooling bracket;

[0031] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure of the liquid cooling bracket in disassembled state;

[0032] Figure 5 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle terminal assembly;

[0033] Figure 6 yes Figure 1 Main cross-sectional view of the middle terminal assembly;

[0034] Figure 7 This is a schematic diagram of the three-dimensional structure of the charging gun head assembly in the assembled state;

[0035] Figure 8 yes Figure 7 Main section view of

[0036] Figure 9 yes Figure 7 Schematic diagram of the three-dimensional structure of the gun head assembly in the disassembled state.

[0037] 1. Liquid cooling bracket; 101. Liquid cooling sleeve; 101a. Step; 101b. Anti-rotation groove; 102. Liquid inlet connector; 103. Liquid outlet connector; A. Sealed liquid cooling cavity; 2. Liquid inlet pipe; 3. Liquid outlet pipe; 4. Terminal; 401. Interchangeable terminal head fixing seat; 401a. Temperature sensor positioning hole; 402. Cable fixing seat; 4a. Raised rib; 5. Rubber-coated thermal sleeve; 501. Spiral guide rib; 6. Terminal sealing ring; 7. Quick connector; 8. Fixing clamp; 801. Anti-rotation rib Block; 9. Cable; 10. Horizontal liquid inlet channel; 11. Vertical liquid inlet channel; 12. Liquid inlet process hole; 13. Liquid inlet process hole sealing gasket; 14. Horizontal liquid outlet channel; 15. Vertical liquid outlet channel; 16. Liquid outlet process hole; 17. Liquid outlet process hole sealing gasket; 18. Replaceable terminal head; 19. Gun head motherboard shell; 19a. Motherboard shell terminal hole; 20. Replaceable gun head panel; 20a. Terminal head pressing sleeve; 21. Gun head sealing gasket; 22. Liquid cooling bracket fixing screw; 23. Terminal head positioning screw. DETAILED DESCRIPTION

[0038] Example 1: First combine Figures 1 to 6 and Figure 8 The specific structure of the terminal liquid cooling device provided by the utility model is described in detail as follows:

[0039] Like the known technology, this low-flow-resistance and easy-to-assemble terminal liquid cooling device itself is a component of the charging gun's gun head assembly. It has a liquid cooling bracket 1, two terminal assemblies mounted thereon, and a liquid inlet pipe 2 and a liquid outlet pipe 3 corresponding to each terminal assembly. The core improvements of the present invention are as follows:

[0040] Two liquid cooling sleeves 101 corresponding to the terminal assemblies and separated from each other are fixed side by side on the liquid cooling bracket 1 , and each liquid cooling sleeve 101 is used to accommodate a corresponding terminal assembly.

[0041] Specific as Figure 5 、 Figure 6 and Figure 8As shown, each terminal assembly is composed of a terminal 4, a rubber-coated thermally conductive sleeve 5, and two terminal sealing rings 6. The terminal 4 is inserted into the liquid cooling sleeve 101. The head and tail of the terminal 4 extend out of the liquid cooling sleeve 101, while the middle portion is covered with a rubber-coated thermally conductive sleeve 5. The front and rear peripheries of the rubber-coated thermally conductive sleeve 5 are covered with terminal sealing rings 6 that are tightly attached to the inner circumference of the liquid cooling sleeve 101. The two terminal sealing rings 6 and the inner circumference of the liquid cooling sleeve 101 form a sealed liquid cooling cavity A surrounding the rubber-coated thermally conductive sleeve 5. In this embodiment, the outer periphery of the rubber-coated thermally conductive sleeve 5 is formed with spiral guide ribs 501 to enhance the uniformity of the flow of the cooling medium around the rubber-coated thermally conductive sleeve 5, so that the terminal 4 is fully cooled and dissipated. At the same time, the outer periphery of the terminal sealing ring 6 in this embodiment is formed with double sealing ribs to enhance the sealing of the sealed liquid cooling cavity A and prevent leakage.

[0042] Recombination Figures 1 to 4 and Figure 8 As shown, in this embodiment, the upper portion of the liquid-cooling sleeve 101 is provided with a liquid inlet connector 102 that communicates with the sealed liquid-cooling inner cavity A, while the lower portion is provided with a liquid outlet connector 103 that communicates with the sealed liquid-cooling inner cavity A. A quick connector 7 is pressed into the liquid inlet connector 102 to allow the liquid inlet pipe 2 to be inserted and fixed, and a quick connector 7 is also pressed into the liquid outlet connector 103 to allow the liquid outlet pipe 3 to be inserted and fixed.

[0043] Furthermore, in this embodiment, the liquid inlet joint 102 and the liquid outlet joint 103 on each of the liquid cooling sleeves 101 are staggered along the axial direction of the liquid cooling sleeve 101 .

[0044] A fixing collar 8 is embedded around the outer periphery of the head of the terminal 4. This fixing collar 8 abuts against the front end of the liquid-cooling sleeve 101 to prevent the terminal 4 from retreating. A rib 4a is formed on the tail of the terminal 4, abutting against a step 101a provided on the inner wall at the rear end of the liquid-cooling sleeve 101 to prevent the terminal 4 from advancing, thereby axially limiting and fixing the terminal 4 within the liquid-cooling sleeve 101. Furthermore, a rotation-stopping protrusion 801 is fixed to the fixing collar 8, while a rotation-stopping groove 101b is formed at the front end of the liquid-cooling sleeve 101 to cooperate with the rotation-stopping protrusion 801 to prevent the fixing collar 8 from rotating.

[0045] Still combined Figure 5 、 Figure 6 and Figure 8As shown, in this embodiment, the head of the terminal 4 is enlarged to form a replaceable terminal head fixing seat 401. This replaceable terminal head fixing seat 401 extends from the front end of the liquid-cooling sleeve 101 and is provided with an embedding groove on its outer periphery for embedding the fixing collar 8. At the same time, the replaceable terminal head fixing seat 401 is radially provided with a temperature sensor positioning hole 401a for inserting and fixing the temperature sensor. The tail of the terminal 4 is enlarged to form a cable fixing seat 402 for fixing the cable 9. This cable fixing seat 402 extends from the rear end of the liquid-cooling sleeve 101, and the rib 4a is formed on the front of the cable fixing seat 402. The rubber-coated thermal conductive sleeve 5 is located between the replaceable terminal head fixing seat 401 and the cable fixing seat 402 in the axial direction of the terminal 4.

[0046] Combine Figure 3 、 Figure 4 and Figure 8 As shown, in this embodiment, the liquid inlet joint 102 is provided with an L-shaped liquid inlet channel, which includes a horizontal liquid inlet channel 10 parallel to the liquid-cooling sleeve 101 and a vertical liquid inlet channel 11 connecting the horizontal liquid inlet channel 10 and the sealed liquid-cooling inner cavity A. At the same time, the liquid inlet joint 102 is provided with a liquid inlet process hole 12 that passes through the vertical liquid inlet channel 11, and the liquid inlet process hole 12 is sealed by a liquid inlet process hole sealing gasket 13 locked by a screw (not marked in the figure); similarly, the liquid outlet joint 103 is provided with an L-shaped liquid outlet channel, which includes a horizontal liquid outlet channel 14 parallel to the liquid-cooling sleeve 101 and a vertical liquid outlet channel 15 connecting the horizontal liquid outlet channel 14 and the sealed liquid-cooling inner cavity A. At the same time, the liquid outlet joint 103 is provided with a liquid outlet process hole 16 that passes through the vertical liquid outlet channel 15, and the liquid outlet process hole 16 is sealed by a liquid outlet process hole sealing gasket 17 locked by a screw (not marked in the figure).

[0047] Example 2: Recombination Figures 7 to 9 As shown, a charging gun has a gun head assembly, which includes a terminal liquid cooling device with low flow resistance and easy assembly in the above embodiment 1.

[0048] The gun head assembly further includes replaceable terminal heads 18 corresponding one-to-one to the terminals 4, a gun head mainboard shell 19, and a replaceable gun head panel 20 fixed to the front of the gun head mainboard shell 19 with screws.

[0049] The liquid cooling bracket 1 is provided with positioning holes at both the top and bottom, and is fixed to the positioning posts on the rear of the gun head mainboard housing 19 by passing liquid cooling bracket fixing screws 22 through it. The gun head mainboard housing 19 has a mainboard housing terminal hole 19a corresponding to each terminal 4, through which the head of the terminal 4 extends. The replaceable terminal head 18 is fixed to the corresponding terminal head 4 by the terminal head fixing screw 23. The replaceable gun head panel 20 is formed with a terminal head pressing sleeve 20a that fits over the replaceable terminal head 18. A gun head sealing gasket 21 corresponding to each replaceable terminal head 18 is sandwiched between the gun head mainboard housing 19 and the replaceable gun head panel 20.

[0050] Of course, the above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

Claims

1. A terminal liquid cooling device with low flow resistance and easy assembly, comprising a liquid cooling bracket (1), a plurality of terminal assemblies mounted thereon, and a liquid inlet pipe (2) and a liquid outlet pipe (3) provided corresponding to each terminal assembly, characterized in that A plurality of liquid cooling sleeves (101) corresponding to the terminal assemblies and separated from each other are fixed side by side on the liquid cooling bracket (1); each terminal assembly includes a terminal (4) inserted into the liquid cooling sleeve (101); the head and tail of the terminal (4) extend out of the liquid cooling sleeve (101), and the middle is covered with a rubber-coated heat-conducting sleeve (5); the front and rear outer peripheries of the rubber-coated heat-conducting sleeve (5) are covered with terminal sealing rings (6) that are tightly attached to the inner peripheral wall of the liquid cooling sleeve (101). A sealed liquid cooling inner cavity (A) surrounding the rubber-coated heat-conducting sleeve (5) is formed between them and the inner peripheral wall of the liquid cooling sleeve (101); a liquid inlet joint (102) and a liquid outlet joint (103) communicating with the sealed liquid cooling inner cavity (A) are provided on the liquid cooling sleeve (101); a quick connector (7) is pressed into the liquid inlet joint (102) for the liquid inlet pipe (2) to be inserted and fixed, and a quick connector (7) is also pressed into the liquid outlet joint (103) for the liquid outlet pipe (3) to be inserted and fixed.

2. A terminal liquid cooling device with low flow resistance and easy assembly according to claim 1, characterized in that A fixing collar (8) is embedded in the outer periphery of the head of the terminal (4), and the fixing collar (8) abuts against the front end of the liquid cooling sleeve (101) to prevent the terminal (4) from retreating, while a convex rib (4a) is formed on the tail of the terminal (4) to abut against a step (101a) provided on the inner peripheral wall of the rear end of the liquid cooling sleeve (101) to prevent the terminal (4) from advancing, thereby axially limiting and fixing the terminal (4) in the liquid cooling sleeve (101).

3. A terminal liquid cooling device with low flow resistance and easy assembly according to claim 2, characterized in that The head of the terminal (4) is expanded to form a replaceable terminal head fixing seat (401), which extends out of the front end of the liquid cooling sleeve (101) and has an outer circumference provided with an embedding groove for embedding the fixing clamp (8), and the replaceable terminal head fixing seat (401) is radially provided with a temperature sensor positioning hole (401a) for inserting a fixed temperature sensor; and the tail of the terminal (4) is expanded to form a cable fixing seat (402) for fixing a cable (9), which extends out of the rear end of the liquid cooling sleeve (101), and the rib (4a) is formed at the front of the cable fixing seat (402); the rubber-coated heat-conducting sleeve (5) is located between the replaceable terminal head fixing seat (401) and the cable fixing seat (402) in the axial direction of the terminal (4).

4. A terminal liquid cooling device with low flow resistance and easy assembly according to claim 2, characterized in that A rotation-stopping protrusion (801) is fixed on the fixed clamping ring (8), and a rotation-stopping groove (101b) is formed on the front end of the liquid cooling sleeve (101) and cooperates with the rotation-stopping protrusion (801) to prevent the fixed clamping ring (8) from rotating.

5. The terminal liquid cooling device with low flow resistance and easy assembly according to claim 1, characterized in that The liquid inlet joint (102) is provided with an L-shaped liquid inlet channel, which includes a horizontal liquid inlet channel (10) parallel to the liquid cooling sleeve (101) and a vertical liquid inlet channel (11) connecting the horizontal liquid inlet channel (10) and the sealed liquid cooling inner cavity (A). At the same time, the liquid inlet joint (102) is provided with a liquid inlet process hole (12) that is connected to the vertical liquid inlet channel (11). The liquid inlet process hole (12) is sealed by a liquid inlet process hole sealing gasket (13) that is locked with a screw; The liquid outlet joint (103) is provided with an L-shaped liquid outlet channel, which includes a horizontal liquid outlet channel (14) parallel to the liquid cooling sleeve (101) and a vertical liquid outlet channel (15) connecting the horizontal liquid outlet channel (14) and the sealed liquid cooling inner cavity (A). At the same time, the liquid outlet joint (103) is provided with a liquid outlet process hole (16) that is connected to the vertical liquid outlet channel (15). The liquid outlet process hole (16) is sealed by a liquid outlet process hole sealing gasket (17) locked by a screw.

6. A terminal liquid cooling device with low flow resistance and easy assembly according to claim 1 or 5, characterized in that The liquid inlet joint (102) and the liquid outlet joint (103) on each liquid cooling sleeve (101) are staggered along the axial direction of the liquid cooling sleeve (101).

7. A terminal liquid cooling device with low flow resistance and easy assembly according to claim 1 or 5, characterized in that Spiral flow-guiding ribs (501) are formed on the outer periphery of the rubber-coated heat-conducting sleeve (5).

8. The terminal liquid cooling device with low flow resistance and easy assembly according to claim 1, characterized in that The outer periphery of the terminal sealing ring (6) is formed with double sealing ribs.

9. A charging gun, comprising a gun head assembly, characterized in that The gun head assembly includes a terminal liquid cooling device with low flow resistance and easy assembly as described in any one of claims 1 to 8.

10. The charging gun according to claim 9, characterized in that The gun head assembly also includes a replaceable terminal head (18) corresponding to the terminal (4), a gun head mainboard shell (19) and a replaceable gun head panel (20) fixed to the front of the gun head mainboard shell (19), the rear of the gun head mainboard shell (19) is fixed to the liquid cooling bracket (1), and the gun head mainboard shell (19) is provided with a mainboard shell terminal hole (19a) for the head of the terminal (4) to extend corresponding to each terminal (4), the replaceable terminal head (18) is fixed to the corresponding terminal (4) head, and the replaceable gun head panel (20) is formed with a terminal head pressing sleeve (20a) that is sleeved on the replaceable terminal head (18); and a gun head sealing gasket (21) that is sleeved on each replaceable terminal head (18) is sandwiched between the gun head mainboard shell (19) and the replaceable gun head panel (20).

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