Charging socket terminal drainage structure and charging socket

Abstract

The utility model discloses a charging socket terminal drainage structure and a charging socket. The charging socket terminal drainage structure comprises a drainage flow channel; the charging socket insulating shell comprises an alternating current insulating seat and a direct current insulating seat; the bottom of a terminal cavity of the alternating current insulation seat is provided with a hole I communicated with a drainage channel, the drainage channel is arranged on the back face of the alternating current insulation seat, and the side wall of one side, close to the direct current insulation seat, of the alternating current insulation seat is provided with a middle drainage hole. And the middle drainage hole is used for communicating the drainage flow channel with peripheral flow channels of the alternating current insulating seat and the direct current insulating seat. After the drainage structure is reasonably arranged in the insulating shell of the charging socket, on the basis of ensuring the electrical isolation performance of the insulating shell, water in each terminal cavity can be drained out of the charging socket through the drainage hole in the bottom of the insulator after passing through the alternating current drainage structure and the direct current drainage structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of charging sockets, and in particular relates to a charging socket terminal drainage structure and a charging socket. Background Art

[0002] The charging of new energy vehicles is achieved by cooperating between the charging socket installed on the vehicle and the charging gun on the charging pile to transmit electric energy. Currently, except for home charging piles, most public charging piles are installed in outdoor areas. When charging in rainy and snowy weather, there is a risk of water entering the cavity of the charging socket terminal. Because the European and American standard electric vehicle charging interfaces comply with the requirements of IEC 62196, the cavity where the terminal is located is cylindrical, and it is difficult for water to flow out of the cavity after entering, which affects the service life of the terminal.

[0003] In order to realize the drainage function of the terminal part in the related art, the following measures are adopted, such as Figure 1 As shown, the first type is a terminal-free single-hole drainage structure, which only has a bottom drainage hole. Products without terminal single-hole drainage structures cannot drain the accumulated water in the terminal cavity, affecting the service life of the terminal. In the prior art, although there is a solution to set up a drainage channel to solve the drainage problem inside the terminal cavity, the setting of one part of the drainage channel itself is not reasonable, and the other part does not consider how to achieve good isolation between the drainage channel and the terminal, so it may be difficult to ensure the electrical isolation performance of the charging socket insulation shell. At the same time, the prior art does not consider how to conveniently connect the charging socket drainage port with the outside to ensure that the charging socket is well connected with the external drainage system. At the same time, it also does not consider how to achieve a sealing method for the charging socket drainage port to avoid the influence of adverse factors such as dust and water from the external environment on the reverse invasion of the charging socket. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art and to provide a charging socket terminal drainage structure and a charging socket. The device optimizes the drainage structure and reasonably arranges the drainage structure in the insulating shell of the charging socket. On the basis of ensuring the electrical isolation performance of the insulating shell, the water in each terminal cavity can be discharged from the charging socket through the AC drainage structure and the DC drainage structure, and finally through the drainage port at the bottom of the insulator.

[0005] One of the purposes of the utility model is to provide a charging socket terminal drainage structure, including a drainage channel; the charging socket insulating shell includes an AC insulation seat and a DC insulation seat; a hole I connected to the drainage channel is opened at the bottom of the terminal cavity of the AC insulation seat, the drainage channel is opened on the back of the AC insulation seat, and a middle drainage hole is set on the side wall of the AC insulation seat close to the DC insulation seat. The middle drainage hole is used to connect the drainage channel with the peripheral channels of the AC insulation seat and the DC insulation seat.

[0006] As a preferred embodiment, the AC insulating seat is provided with terminal cavity group I, terminal cavity group II and terminal cavity group III arranged in sequence, wherein terminal cavity group I includes two first terminal cavities, terminal cavity group II includes three second terminal cavities, terminal cavity group III includes two third terminal cavities, and the drainage channels are directly connected to the hole I at the bottom of the first, second and third terminal cavities.

[0007] As a preferred solution, the drainage channel includes two first branch channels, two second branch channels and a main channel, the head ends of the two first branch channels are respectively connected to the hole I at the bottom of the corresponding first terminal cavity, and the two first branch channels respectively surround the two sides of the second terminal cavity located in the middle of the terminal cavity group II and converge at the hole I of the second terminal cavity; the head ends of the two second branch channels are respectively connected to the hole I at the bottom of the corresponding second terminal cavity located on both sides of the terminal cavity group II, and the two second branch channels respectively surround the corresponding third terminal cavity and are connected to the hole I at its bottom;

[0008] The first branch flow channel and the second branch flow channel are respectively connected to the head and tail ends of the main flow channel; the tail end of the main flow channel is also connected to the middle drainage hole of the AC insulation seat.

[0009] As a preferred solution, the drainage channel of the AC insulating seat is sealed by a back sealing gasket, which is adapted to the shape of the notch at the bottom of the AC insulating seat and is used to seal one side end face of the drainage channel and form a semi-closed channel.

[0010] As a preferred embodiment, a plurality of parallel sealing ribs are formed on the entire outer edge of the back sealing gasket; a first through hole is provided at a position corresponding to the first terminal cavity of the back sealing gasket, and an inner sealing convex pattern is formed on the inner wall of the first through hole; a second through hole is provided at a position corresponding to the second terminal cavity of the back sealing gasket, and a sealing rubber sleeve is formed at the cooperation between the second through hole and the bottom of the second terminal cavity, and the outer ring surface of the sealing rubber sleeve has an external sealing rib.

[0011] As a preferred solution, a plug is provided at a position of the back sealing gasket corresponding to the third terminal cavity, and the plug is used to seal the third terminal cavity.

[0012] As a preferred solution, the DC insulation seat is provided with two fourth terminal cavities, and a hole II communicating with the peripheral flow channel is formed at the bottom of the fourth terminal cavity.

[0013] As a preferred solution, a bottom drain outlet is provided at the bottom of the insulating shell of the charging socket, and a drain outlet connector is installed at the bottom drain outlet. The drain outlet connector is connected to the bottom drain outlet by a snap-fit ​​or screw method.

[0014] As a preferred embodiment, the drain outlet connector includes a connecting socket that cooperates with the bottom drain outlet and a drain pipe arranged at the bottom of the connecting socket, and the side wall of the connecting socket is surrounded by a plurality of side panels, and a gap is formed between adjacent side panels; a buckle is provided on the outer side wall of the bottom drain outlet, and a slot that cooperates with the buckle is provided on the side panel.

[0015] As a preferred solution, a first buckle and a second buckle are provided on the outer walls on both sides of the bottom drain outlet, and a first buckle groove corresponding to the first buckle and a second buckle groove corresponding to the second buckle are formed on two opposite side panels of the drain outlet connecting piece; the first buckle and the second buckle have different sizes and / or shapes to ensure the snap-fitting direction of the bottom drain outlet and the drain outlet connecting piece.

[0016] As a preferred solution, at least two dust-proof plates are arranged in the drain pipe, one side of the dust-proof plate is fixed on the inner pipe wall of the drain pipe, and the other side is inclined downward to gradually form a certain slope; the dust-proof plates are arranged along the length direction of the drain pipe to form a curved diversion channel.

[0017] As a preferred solution, a sealing rubber pad is provided at the bottom of the groove body of the connecting socket, and after the drain outlet connector is buckled with the bottom drain outlet, the sealing of the contact end surface is achieved by pressing the sealing rubber pad therebetween.

[0018] A second objective of the present utility model is to provide a charging socket, comprising the charging socket terminal drainage structure described in any one of the above items.

[0019] Beneficial Effects

[0020] First, the utility model can effectively solve the problem of the charging socket terminal cavity being unable to drain water after water accumulates in it through structural improvement and the terminal single-hole drainage structure. This solution is provided with a hole I at the bottom of the terminal cavity for draining the accumulated water in the terminal cavity, and a drainage channel is provided on the back of the AC insulation seat. The water in the terminal cavity is collected into the main channel and discharged to the peripheral channel through the middle drainage hole, and the water in the peripheral channel and the water discharged from the hole II of the DC insulation seat are collected at the bottom drainage port and then discharged to the outside. In order to achieve the isolation of the drainage channel from the terminal cavity, this solution also designs a matching back sealing gasket for the structure of each terminal cavity group, through which the drainage channel is sealed as a semi-closed drainage channel, and the corresponding sealing isolation effect is achieved between each terminal and the drainage channel through the back sealing gasket.

[0021] Secondly, in this solution, a drain outlet connector is connected at the bottom drain outlet by means of a snap or screw connection, and a hose can also be connected to the drain outlet connector to divert the accumulated water. Therefore, this solution also provides a sealing connection method for the accumulated water diversion member when an external diversion member is required at the bottom drain outlet connection of the charging socket. Through the sealing method of this solution, a gap is formed between the side panels of the drain outlet connector, and a snap-on fastening connection can be achieved through the elastic deformation of the side panels. At the same time, a dustproof plate is provided in the drain pipe, which to a certain extent avoids the influence of the reverse intrusion of external dust or water on the charging socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural diagram of an insulating housing of a charging socket in the prior art;

[0024] Figure 2 The structure of the insulating housing of the charging socket in this scheme Figure 1 ;

[0025] Figure 3 The structure of the insulating housing of the charging socket in this scheme Figure 2 ;

[0026] Figure 4 This is the structural diagram of the drainage channel in this scheme;

[0027] Figure 5 This is a structural diagram of the back sealing pad in this solution;

[0028] Figure 6 This is an exploded schematic diagram of the charging socket insulation housing, back sealing gasket and terminal in this solution;

[0029] Figure 7 This is a cross-sectional view of the charging socket of this solution;

[0030] Figure 8 This is a schematic diagram of the structure of the bottom drain in this scheme. Figure 1 ;

[0031] Fig. 9 The structure diagram of the bottom drain port in this scheme Figure 2 ;

[0032] Fig.10 This is a structural diagram of the drain outlet connector in this solution;

[0033] Fig.11 This is the structural diagram of the sealing gasket in this scheme;

[0034] Fig.12 It is a cross-sectional view of the connection between the bottom drain outlet and the drain outlet connector in this solution;

[0035] Fig.13 is a cross-sectional view of a drain outlet connector with a dust plate;

[0036] Markings in the figure: 1. Charging socket insulation shell, 11. AC insulation seat, 111. Terminal cavity group I, 112. Terminal cavity group II, 113. Terminal cavity group III, 114. Hole I, 12. DC insulation seat, 121. Hole II, 13. Drainage channel, 131. First branch channel, 132. Second branch channel, 133. Main channel, 15. Middle drainage hole, 16. Peripheral channel, 17. Back sealing gasket, 171. First through hole, 172. Second through hole, 173. Plug, 174. Sealant Sleeve, 175, sealing rib, 18, bottom drain port, 181, first buckle, 182, second buckle, 183, partition, 19, drain port connector, 190, connecting base, 191, drain pipe, 192, side plate, 193, annular boss, 194, side plate gap, 195, first slot, 196, second slot, 197, dustproof plate, 198, notch, 199, sealing pad, 100, AC terminal, 200, DC terminal, 300, signal terminal, 400, O-ring. DETAILED DESCRIPTION

[0037] The present invention is described in detail below by means of exemplary embodiments. However, it should be understood that, without further description, the elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0038] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this document shall have the usual meanings understood by people with ordinary skills in the field to which the utility model belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the utility model do not express quantitative limitations, but indicate the existence of at least one. The words "include" or "comprise" and the like indicate that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, but do not exclude other elements or objects with the same function.

[0039] A typical embodiment of the utility model provides a charging socket terminal drainage structure, including a drainage channel 13 arranged in a charging socket insulation shell 1, the charging socket insulation shell 1 includes an AC insulation seat 11 and a DC insulation seat 12, and a plurality of terminal cavity groups are arranged on the AC insulation seat 11. For the drainage structure of the AC insulation seat 11, a hole Ⅰ114 is opened at the bottom of the terminal cavity of the AC insulation seat 11, and water discharged through the hole Ⅰ114 is merged into the drainage channel 13 on the back of the AC insulation seat 11 and is led to the middle drainage hole 15 of the AC insulation seat 11, and then the water flows through this opening to the peripheral flow channel 16 of the DC insulator. A hole Ⅰ114 is provided on the side wall of one side near the DC insulating seat 12 at the bottom of each terminal cavity. The hole Ⅰ114 is provided to drain the accumulated water inside the terminal cavity. A drainage channel 13 is provided on the back of the AC insulating seat 11. The drainage channel 13 is located between the gaps of the terminal cavity. The back of the AC insulating seat 11 refers to the opposite end face of the opening side of the terminal cavity. As shown in the figure, an outlet of the drainage channel 13 is provided on the side wall of the AC insulating seat 11 near the DC insulating seat 12. The outlet is the middle drainage hole 15. It can be seen from the above structure that the hole Ⅰ114 at the bottom of each terminal cavity in the AC insulating seat 11 is discharged through the drainage channel 13 and finally through the middle drainage hole 15, thereby entering the peripheral channel 16.

[0040] In this solution, three rows of terminal cavities are arranged in sequence in the AC insulation seat 11, namely, terminal cavity group I 111, terminal cavity group II 112 and terminal cavity group III 113. As shown in the figure, terminal cavity group I includes two first terminal cavities, terminal cavity group II 112 includes three second terminal cavities, and terminal cavity group III 113 includes two third terminal cavities. Each terminal cavity of terminal cavity group I 111, terminal cavity group II 112 and terminal cavity group III 113 is directly connected to the drainage channel 13 through hole I 114.

[0041] In one embodiment, the drainage channel 13 includes a plurality of branch channels located between the side walls of the terminal cavity, and the branch channels all merge into the main channel 133 and are discharged to the peripheral channel 16 through the middle drainage hole 15. The drainage channel 13 specifically includes two first branch channels 131, two second branch channels 132, and the main channel 133. The head ends of the two first branch channels 131 are connected with the hole I 114 at the bottom of the first terminal cavity, and the tail ends of the two first branch channels 131 are connected and intersected to form a U-shaped structure as a whole. The U-shaped structure surrounds the periphery of the second terminal cavity located in the middle position in the terminal cavity group II 112. The two first branch channels 131 are connected at the hole I 114 of the second terminal cavity and then merge into the main channel 133. The head ends of the two second branch channels 132 are respectively connected with the second terminal cavities located on both sides of the terminal cavity group II 112. The second branch channels 132 are respectively arranged around the periphery of the third terminal cavity on one side, and the tail ends of the second branch channels 132 merge with the bottom hole Ⅰ114 of the third terminal cavity and then merge into the main channel 133. In this scheme, the two first branch channels 131 and the two second branch channels 132 are respectively symmetrically arranged, and the end of the main channel 133 is connected to the middle drainage hole 15 on the side wall of the AC insulating shell 1 and merges into the peripheral channel 16.

[0042] In one embodiment, the present solution takes into account that the end face of the drainage channel 13 needs to be closed, and the drainage channel 13 also needs to be isolated from the terminal. The outer periphery of the back side of the AC insulating seat 11 is surrounded by a closed notch, and a back sealing gasket 17 is specially designed to match the notch. The back sealing gasket 17 is consistent with the shape of the inner wall of the notch, and a sealing rib 175 is formed on the outer edge of the back sealing gasket 17. The sealing effect is achieved by the extrusion effect of the sealing rib 175 and the inner wall of the notch, and the sealing fit between the end face of one side of the back sealing gasket 17 and the drainage channel 13 is used to form a semi-closed drainage channel.

[0043] In this solution, in order to achieve a sealed fit with the terminals, a number of structures for different terminal cavity groups are formed on the back sealing gasket 17. The back sealing gasket 17 includes two first through holes 171. An inner sealing convex pattern is formed on the inner wall of the first through hole 171. The first through hole 171 is arranged at a position corresponding to the first terminal cavity, and the inner sealing convex pattern seals with the cylindrical surface of the signal terminal 300; three second through holes 172 are arranged at the back sealing gasket 17 corresponding to the second terminal cavity. A sealing rubber sleeve 174 is formed at the position where the second through hole 172 cooperates with the bottom of the second terminal cavity. The outer annular surface of the sealing rubber sleeve 174 has an outer sealing rib, which is sealed with the opening on the shell of the AC insulating seat 11, and the inner sealing convex pattern arranged in the second through hole 172 seals with the outer wall of the AC terminal 100. Two plugs 173 can be arranged at the back sealing gasket 17 corresponding to the third terminal cavity, which are not opened here. hole This is because when the product is single-phase, there are no L2 and L3 phases, and the L2 and L3 holes need to be blocked to achieve the sealing of the terminal cavity there.

[0044] In this solution, the DC insulation seat 12 is provided with two fourth terminal cavities, and a hole II121 communicating with the peripheral flow channel 16 is provided at the bottom of the fourth terminal cavity. The accumulated water in the fourth terminal cavity can be directly discharged into the peripheral flow channel 16 through the hole II121, and finally discharged from the bottom drain port 18 of the charging socket insulation housing 1. For the drainage structure of the DC insulation seat 12, a hole II121 is provided at the bottom of the terminal cavity of the insulation seat 12, and the water flows directly out of the charging socket through the bottom drain port 18 of the charging socket insulation housing 1; and the DC terminal 200 and the insulator are sealed with an O-ring 400.

[0045] It should be pointed out that the top of the charging socket insulating shell 1 in this solution refers to the side close to the AC insulating seat 11, while the bottom of the charging socket insulating shell 1 refers to the side close to the DC insulating seat 12.

[0046] In a typical embodiment of the present invention, considering that the bottom drain outlet 18 requires an external drain outlet connector 19 to achieve external drainage of accumulated water in the insulating shell 1 of the charging socket, this solution proposes the following connection method between the external drain outlet connector 19 and the bottom drain outlet 18.

[0047] The drain outlet connector 19 can be detachably connected to the bottom drain outlet 18 by means of a snap or screw connection.

[0048] The first embodiment is a snap-on connection method, and the specific structure is as follows: the tube cavity of the bottom drain port 18 is a square opening structure, and a partition 183 is arranged in the tube cavity to divide the tube cavity into two along the axial direction. A first clamping block 181 and a second clamping block 182 are arranged on at least two opposite surfaces of the tube cavity side wall, and a first and a second clamping groove 195, 196 cooperating with the first and second clamping blocks 181, 182 are formed on the side wall of the docking interface of the drain port connector 19. The structure of the drain port connector 19 is as follows. As shown in the figure, the drain port connector 19 includes a connecting base 190 and a drain pipe 191, wherein the drain pipe 191 is arranged at the bottom of the connecting base 190, wherein the connecting base 190 includes a bottom plate and a plurality of side plates 192 arranged at the edge of the bottom plate to surround and form a side plate gap 194 between adjacent side plates 192. The purpose of setting the side plate gap 194 is to enable the side plates 192 of the connecting base 190 to be able to when the bottom drain port 18 and the drain port connector 19 are snap-fitted. The side plate 192 is able to be deformed by pressure. When the block enters the slot smoothly, the side plate 192 is reset from the deformed state, so that the side plate 192 can apply a clamping force to the bottom drain port 18 from the outside in the opposite direction, thereby realizing a fastened connection between the block and the slot. Considering the sealing performance of the sealing surface between the bottom drain port 18 and the bottom inner bottom of the connecting card seat 190, a sealing pad 199 is provided at the bottom of the connecting card seat 190. The sealing pad 199 is squeezed from the upper and lower sides by the drain port connector 19 and the bottom drain port 18 to achieve sealing at the connection.

[0049] In the present embodiment, in order to prevent the drain outlet connector 19 from being incorrectly installed, the sizes of the first and second clamping blocks 181 and 182 may be inconsistent, and the sizes of the first and second clamping grooves 195 and 196 that match them may also be inconsistent. When installing, the clamping blocks can only be installed in the corresponding clamping grooves, which can avoid incorrect installation. Of course, the shapes of the first and second clamping blocks 181 and 182 can also be set to different structures, and the shapes of the first and second clamping grooves 195 and 196 that match them may be inconsistent, which can also play a role in ensuring the assembly direction.

[0050] In this embodiment, in order to ensure the convenience of disassembly of the drain outlet connector 19, a notch 198 is provided at the edge of the side panel where the first and second clamping blocks 181 and 182 are provided. The notch 198 can leave space for the insertion of a disassembly tool to facilitate the disassembly of the drain outlet connector 19.

[0051] The second embodiment is to use a screw connection method. In an embodiment not shown in the figure, a screw connection hole is provided on the tube cavity of the bottom drain outlet 18, and a corresponding screw through-hole is provided on the edge of the docking interface of the drain outlet connector 19. The screw is passed through the screw through-hole and then screwed into the screw connection hole, thereby achieving the fixation of the two docking interfaces. The drain outlet connector includes a connecting seat and a drain pipe, wherein the drain pipe is arranged at the bottom of the connecting seat, and the shape of the docking interface of the connecting seat is adapted to the shape of the tube cavity of the bottom drain outlet. The two are connected by the above-mentioned screw method, and a sealing rubber pad is provided at the bottom of the connecting seat. The sealing rubber pad is squeezed from the upper and lower sides by the drain outlet connector 19 and the bottom drain outlet 18 to achieve sealing at the connection.

[0052] In this solution, since the drain pipe 191 of the drain port connector needs to be connected to a hose for external drainage, in order to achieve sealing at the hose connection, a circle of annular bosses 193 are formed at the circular end of the drain port connector, and the annular bosses 193 are also provided with a conical surface, which can facilitate the connection of the hose, and achieve sealing between the hose and the drain port connector 19 by forced installation or bundling. The hose nozzle can be sealed and connected with the annular bosses 193, so as to finally achieve external drainage of the accumulated water in the charging socket through the hose.

[0053] In this solution, a sealing structure is also provided in the drain pipe 191, including more than two dustproof plates 197, wherein one fixed side of the dustproof plate 197 is connected to the inner wall of the drain pipe 191, and the other side is inclined downward to form a certain slope. The multiple dustproof plates 197 are arranged along the axial length direction of the drain pipe 191, so that an approximately S-shaped labyrinth-like diversion channel is formed inside the drain pipe 191, which can prevent dust or water from invading the charging socket from the drain pipe 191 in reverse to a certain extent.

[0054] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A charging socket terminal drainage structure, characterized in that: including drainage channels; The charging socket insulating housing includes an AC insulating seat and a DC insulating seat; A hole I connected to a drainage channel is provided at the bottom of the terminal cavity of the AC insulation seat. The drainage channel is provided on the back of the AC insulation seat. An intermediate drainage hole is provided on the side wall of the AC insulation seat close to the DC insulation seat. The intermediate drainage hole is used to connect the drainage channel with the peripheral channels of the AC insulation seat and the DC insulation seat.

2. A charging socket terminal drainage structure according to claim 1, characterized in that: The AC insulating seat is provided with terminal cavity group I, terminal cavity group II and terminal cavity group III arranged in sequence, wherein terminal cavity group I includes two first terminal cavities, terminal cavity group II includes three second terminal cavities, terminal cavity group III includes two third terminal cavities, and the drainage channels are directly connected to the hole I at the bottom of the first, second and third terminal cavities.

3. A charging socket terminal drainage structure according to claim 2, characterized in that: The drainage channel includes two first branch channels, two second branch channels and a main channel. The head ends of the two first branch flow channels are respectively connected to the hole I at the bottom of the corresponding first terminal cavity, and the two first branch flow channels respectively surround the two sides of the second terminal cavity located in the middle position of the terminal cavity group II and converge at the hole I of the second terminal cavity; The head ends of the two second branch flow channels are respectively connected to the holes I at the bottom of the corresponding second terminal cavities located on both sides of the terminal cavity group II, and the two second branch flow channels respectively surround the corresponding third terminal cavity and are connected to the holes I at the bottom thereof; The first branch flow channel and the second branch flow channel are respectively connected to the head and tail ends of the main flow channel; the tail end of the main flow channel is also connected to the middle drainage hole of the AC insulation seat.

4. A charging socket terminal drainage structure according to claim 2, characterized in that: The drainage channel of the AC insulation seat is sealed by a back sealing gasket, which is adapted to the shape of the notch at the bottom of the AC insulation seat and is used to seal one side end face of the drainage channel and form a semi-closed channel.

5. A charging socket terminal drainage structure according to claim 4, characterized in that: A plurality of parallel sealing ribs are formed on the entire outer edge of the back sealing gasket; a first through hole is provided at the position of the back sealing gasket corresponding to the first terminal cavity, and an inner sealing convex pattern is formed on the inner wall of the first through hole; a second through hole is provided at the position of the back sealing gasket corresponding to the second terminal cavity, a sealing rubber sleeve is formed at the cooperation between the second through hole and the bottom of the second terminal cavity, and the outer ring surface of the sealing rubber sleeve has an external sealing rib.

6. A charging socket terminal drainage structure according to claim 5, characterized in that: A plug is provided at a position corresponding to the back sealing gasket and the third terminal cavity, and the plug is used to seal the third terminal cavity.

7. A charging socket terminal drainage structure according to claim 1, characterized in that: The DC insulation seat is provided with two fourth terminal cavities, and a hole II communicating with the peripheral flow channel is formed at the bottom of the fourth terminal cavity.

8. A charging socket terminal drainage structure according to claim 2, characterized in that: A bottom drain outlet is provided at the bottom of the insulating shell of the charging socket, and a drain outlet connector is installed at the bottom drain outlet. The drain outlet connector is connected to the bottom drain outlet by a snap-fit ​​method or a screw method.

9. A charging socket terminal drainage structure according to claim 8, characterized in that: The drain outlet connector includes a connecting socket that cooperates with the bottom drain outlet and a drain pipe arranged at the bottom of the connecting socket. The side wall of the connecting socket is surrounded by a plurality of side panels, and a gap is formed between adjacent side panels. A buckle is provided on the outer side wall of the bottom drain outlet, and a slot that cooperates with the buckle is provided on the side panel.

10. A charging socket terminal drainage structure according to claim 9, characterized in that: A first buckle and a second buckle are provided on the outer walls on both sides opposite to each other of the bottom drain outlet, and a first buckle groove and a second buckle groove are formed on two opposite side panels of the drain outlet connector respectively corresponding to the first buckle; the first buckle and the second buckle have different sizes and / or shapes to ensure the snap-fitting direction of the bottom drain outlet and the drain outlet connector.

11. A charging socket terminal drainage structure according to claim 9, characterized in that: At least two dust-proof plates are arranged in the drain pipe, one side of the dust-proof plate is fixed on the inner pipe wall of the drain pipe, and the other side is inclined downward to gradually form a certain slope; the dust-proof plates are arranged along the length direction of the drain pipe to form a curved diversion channel.

12. A charging socket terminal drainage structure according to claim 9, characterized in that: A sealing rubber pad is arranged at the bottom of the groove body of the connecting card seat. After the drain outlet connector is buckled with the bottom drain outlet, the sealing rubber pad is pressed between the two to achieve sealing of the contact end surface.

13. A charging socket, characterized in that: It includes the charging socket terminal drainage structure as described in any one of claims 1-12.

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