Cable locking and sealing structure and charging equipment

Abstract

The utility model discloses a cable locking and sealing structure and charging equipment, the cable locking and sealing structure comprises an installation main body, a cable, a first sealing part and an extrusion part, the installation main body is provided with a first structure part and a second structure part which are arranged in sequence in a first direction, a first through hole and a second through hole are respectively formed in the first structure part and the second structure part; the cable penetrates through the first through hole and the second through hole, and the periphery of the cable is sleeved with an overflow opening. The first sealing part abuts against the first structure part, and the first sealing part covers a gap between the first through hole and the cable; the extrusion part is connected to one side of the second structure part, and the first sealing part is located between the extrusion part and the first structure part and abuts against the extrusion part. According to the invention, the extrusion part pushes the first sealing part to extrude the first structure part, so that the first sealing part seals the gap between the cable and the second through hole to realize the sealing between the cable and the first structure part, the waterproof effect is good, and the cable can bear a certain tensile force.

Description

Technical Field

[0001] The present application relates to the technical field of charging equipment, and in particular to a cable locking and sealing structure and a charging equipment. Background Art

[0002] With the increasing popularity of electric vehicles, the industry has higher and higher requirements for the protection performance of charging equipment and modules. Among them, the cable threading holes have both sealing requirements and tension requirements.

[0003] In the related art, a sealing ring is usually set between the wire and the threading hole to achieve the waterproof function of the shell. However, when the cable is subjected to a certain tension, the sealing effect of the sealing ring is easily deteriorated, which in turn causes the waterproof shell to deteriorate, posing certain safety hazards. Utility Model Content

[0004] The main purpose of this application is to provide a cable locking and sealing structure and a charging device, which aims to solve the problem that when the cable is subjected to a certain tension, the sealing effect of the sealing ring is easily deteriorated, which in turn causes the waterproof shell to deteriorate and poses a safety hazard.

[0005] To achieve the above-mentioned purpose, the present application provides a cable locking and sealing structure, which includes an installation body, a cable, a first sealing part and an extrusion part, wherein the installation body has a first structural part and a second structural part arranged in sequence in a first direction, and the first structural part and the second structural part are respectively provided with a first through hole and a second through hole extending along the first direction, and the first direction is the same as the thickness direction of the first structural part, wherein the orthographic projection of the second through hole on the side of the first structural part facing the second structural part along the first direction covers the first through hole; the cable is passed through the first through hole and the second through hole and has the freedom to rotate around the first direction, and the outer periphery of the cable is provided with an overflow port; the first sealing part is located at the outer periphery of the overflow port, and the side of the first sealing part facing the first structural part is located in the second through hole and conflicts with the first structural part, wherein the first sealing part covers the gap between the first through hole and the cable; the extrusion part is connected to the side of the second structural part facing away from the first structural part, wherein the first sealing part is located between the extrusion part and the first structural part and conflicts with the extrusion part.

[0006] Optionally, the first sealing portion cooperates with the second through hole to lock the rotational freedom of the cable.

[0007] Optionally, in the first direction, the maximum distance between the first sealing portion and the first structural portion is a, the maximum distance between the second structural portion and the first structural portion is b, and a>b.

[0008] Optionally, at least two thread grooves are provided on the side of the second structural part facing away from the first structural part; the extrusion part includes an extrusion plate and a screw, wherein the extrusion plate is provided with a plurality of threaded holes corresponding one-to-one to the thread grooves in the first direction; the screw corresponds one-to-one to the plurality of threaded holes and is passed through the corresponding threaded holes and the corresponding thread grooves.

[0009] Optionally, a U-shaped groove is provided on the extrusion plate, and the cable passes through the U-shaped groove.

[0010] Optionally, there are two extrusion plates and both are provided with arc grooves, the outer peripheries of the overflow ports are respectively fitted with the side walls of the two arc grooves, and the two extrusion plates are arranged opposite to each other in a second direction, and the second direction is perpendicular to the first direction.

[0011] Optionally, part of the structure of the overflow port is located in the first through hole; the cable locking and sealing structure also includes a sealing ring, which is located at the outer periphery of the overflow port and contacts the side wall of the first through hole.

[0012] Optionally, there are multiple sealing rings, and the multiple sealing rings are arranged at intervals in the first direction.

[0013] Optionally, the overflow port and the outer covering of the cable are both made of soft rubber material.

[0014] In addition, to achieve the above-mentioned purpose, an embodiment of the present application also provides a charging device, including the above-mentioned cable locking and sealing structure and a shell, wherein a wire threading hole is provided on the side wall of the shell, and the first structural part is installed on the outside of the shell, and the cable passes through the wire threading hole; wherein the second structural part is located on the side of the first structural part away from the shell.

[0015] A cable locking sealing structure proposed in an embodiment of the present application connects an extrusion portion and a second structural portion, where the first sealing portion is located between the extrusion portion and the second structural portion, and the extrusion portion pushes the first sealing portion to squeeze the first structural portion, so that the first sealing portion seals the gap between the cable and the second through hole to achieve sealing between the cable and the first structural portion; at the same time, the two sides of the first sealing portion respectively contact the first structural portion and the second structural portion, and when the cable is subjected to tension, the force of the cable is transmitted to the extrusion portion through the overflow port, so that the cable can withstand a certain tension and will not cause the first sealing portion to move, that is, the sealing effect will not be deteriorated; further, the cable also has the freedom to rotate around the first direction, so it is more convenient to use and has more applicable scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a cable locking and sealing structure provided in an embodiment of the present application;

[0017] Figure 2 A schematic cross-sectional view of a cable locking and sealing structure provided in an embodiment of the present application;

[0018] Figure 3 for Figure 2 A magnified view of the structure in the middle.

[0019] In the figure: 1, first structural part; 11, first through hole; 2, second structural part; 21, second through hole; 22, threaded groove; 3, cable; 31, overflow port; 4, first sealing part; 5, extrusion part; 51, extrusion plate; 511, threaded hole; 512, arc groove; 52, screw; 6, sealing ring; 7, shell.

[0020] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0025] refer to Figure 1 to Figure 3 It should be understood that Figure 1 The connections between the components should be like Figure 2 As compact as in the example, this is just an example. Figure 1 Some components in the middle are disassembled for easy understanding. The embodiment of the present application provides a cable locking and sealing structure and a charging device. The cable locking and sealing structure may include an installation body, a cable 3, a first sealing portion 4 and an extrusion portion 5, wherein the installation body has a first structure portion 1 and a second structure portion 2 arranged in sequence in a first direction, and the first structure portion 1 and the second structure portion 2 are respectively provided with a first through hole 11 and a second through hole 21 extending along the first direction, and the first direction is the same as the thickness direction of the first structure portion 1, wherein the second through hole 21 is on the side of the first structure portion 1 facing the second structure portion 2 along the first direction. The orthographic projection covers the first through hole 11; the cable 3 is inserted into the first through hole 11 and the second through hole 21 and has the freedom to rotate around the first direction, and the outer periphery of the cable 3 is sleeved with an overflow port 31; the first sealing portion 4 is located at the outer periphery of the overflow port 31, and the side of the first sealing portion 4 facing the first structural portion 1 is located in the second through hole 21 and contacts with the first structural portion 1, wherein the first sealing portion 4 covers the gap between the first through hole 11 and the cable 3; the extrusion portion 5 is connected to the side of the second structural portion 2 away from the first structural portion 1, wherein the first sealing portion 4 is located between the extrusion portion 5 and the first structural portion 1 and contacts with the extrusion portion 5.

[0026] A cable locking and sealing structure proposed in an embodiment of the present application connects an extrusion portion 5 and a second structural portion 2, at which time the first sealing portion 4 is located between the extrusion portion 5 and the second structural portion 2, and the extrusion portion 5 pushes the first sealing portion 4 to squeeze the first structural portion 1, so that the first sealing portion 4 seals the gap between the cable 3 and the second through hole 21 to achieve sealing between the cable 3 and the first structural portion 1; at the same time, the two sides of the first sealing portion 4 respectively contact the first structural portion 1 and the second structural portion 2, and when the cable 3 is subjected to tension, the force of the cable 3 is transmitted to the extrusion portion 5 through the overflow port 31, so that the cable 3 can withstand a certain tension and will not drive the first sealing portion 4 to move, that is, it will not cause the sealing effect to deteriorate, and finally the cable 3 and the installation body are fixed and sealed, which can meet the protection requirements of IP67 or above and the tension requirements of the cable 3; further, the cable 3 also has the freedom to rotate around the first direction, so it is more convenient to use and has more applicable scenarios.

[0027] Specifically, Figure 1 As shown, the first direction is the X direction, and the overflow port 31 sleeved on the cable 3 and the first sealing portion 4 sleeved on the outer periphery of the overflow port 31 can be made in one go by injection molding, that is, the overflow port 31 and the first sealing portion 4 are fixed to the outer periphery of the cable 3 in an integral form.

[0028] Among them, the outer periphery of the overflow port 31 has a plurality of skirts spaced apart in the first direction X, the skirt and the overflow port 31 are an integral structure, and are formed by mold injection molding at one time, and the first sealing portion 4 can reuse a skirt on the overflow port 31 that is closest to the first structural portion 1, that is, the corresponding skirt is used as the first sealing portion 4, and the first sealing portion 4, that is, the corresponding skirt, is pushed by the extrusion portion 5 to seal the gap between the cable 3 and the second through hole 21; at the same time, the structure of the overflow port 31 is simple, and mold injection molding is convenient and fast, and easy to mass produce.

[0029] Furthermore, the overflow port 31, the skirt on the overflow port 31 and the outer sheath of the cable 3 are all made of soft rubber materials, such as TPE, TPU, PVC, etc., so that the overflow port 31, the skirt on the overflow port 31 and the cable 3 have a certain flexibility and compressibility, while ensuring the sealing, it can also ensure the bonding force between the overflow port 31 and the cable 3 during injection molding, and the fixing effect is better.

[0030] like Figure 2 As shown, the cable locking and sealing structure can save space in the first direction X to the maximum extent while meeting the requirements of sealing and bearing tension, and is more convenient to use; at the same time, it provides a good technical solution for the miniaturization and lightweight of charging equipment.

[0031] It should be noted that the orthographic projection of the second through hole 21 along the first direction X on the side of the first structure part 1 facing the second structure part 2 covers the first through hole 11, so that when the side of the first sealing part 4 close to the first structure part 1 is located in the second through hole 21, it can cover the gap between the first through hole 11 and the cable 3.

[0032] In an optional scheme, the installation body may also include a third structure part to an nth structure part, where n is a positive integer greater than three, and in the first direction X, the third structure part to the nth structure part are sequentially arranged on the side of the second structure part 2 away from the first structure part 1; similarly, the third structure part to the nth structure part are respectively provided with a third through hole to an nth through hole; and the orthographic projections of the second through hole 21 to the nth through hole on the side of the first structure part 1 facing the second structure part 2 all cover the orthographic projections of the previous through hole on the side of the first structure part 1 facing the second structure part 2; it can be understood here that the installation body has n-level step holes arranged in the first direction.

[0033] Furthermore, the outer periphery of the overflow port 31 may be provided with a second sealing portion to an mth sealing portion, and the second sealing portion to the mth sealing portion may also reuse the skirt of the overflow port 31, m is a positive integer greater than two and m=n-1; the first sealing portion 4 covers the gap between the cable 3 and the first structural portion 1, the second sealing portion covers the gap between the cable 3 and the second structural portion 2, and so on, the mth structural portion seals the gap between the cable 3 and the n-1th structural portion, forming a total of m seals to achieve a higher level of protection.

[0034] It should be understood that when the cable 3 forms m seals with the installation body through the overflow port 31, the first sealing portion 4 to the mth sealing portion are all located between the extrusion portion 5 and the first structural portion 1, and the mth sealing portion is in conflict with the extrusion portion 5. In other words, the extrusion portion 5 drives the remaining sealing portions to fit the corresponding structural portions by extruding the mth sealing portion, so that m seals are formed between the overflow port 31 and the installation body.

[0035] In the exemplary embodiment, the first sealing portion 4 cooperates with the second through hole 21 to lock the rotational freedom of the cable 3 .

[0036] Specifically, the cooperation between the first sealing portion 4 and the second through hole 21 can be a shape cooperation. For example, when the second through hole 21 is a circular hole, that is, when the cross-section of the second through hole 21 perpendicular to the first direction is circular, the outer periphery of the first sealing portion 4 fits with the side wall of the second through hole 21, and the first sealing portion 4 can be driven by the cable 3 to rotate around the first direction X; when the second through hole 21 is a rectangular hole, that is, when the cross-section of the second through hole 21 perpendicular to the first direction is rectangular, at this time, the outer periphery of the first sealing portion 4 fits with the side wall of the second through hole 21 so that the first sealing portion 4 cannot rotate, the first sealing portion 4 is fixed to the overflow port 31, and the overflow port 31 is fixed to the cable 3. In this way, when the first sealing portion 4 cannot rotate, the cable 3 cannot rotate around the first direction X, thereby locking the rotational freedom of the cable 3 and fixing the cable 3, which can be suitable for scenarios where the cable 3 needs to be fixed.

[0037] It should be understood that if the rotational freedom of the cable 3 is to be locked, the second through hole 21 can also be other holes with an anti-rotation function. For example, when the second through hole 21 is a triangular through hole, a pentagonal through hole, a hexagonal through hole, etc., the outer periphery of the first sealing portion 4 fits with the side wall of the second through hole 21, and the cable 3 cannot rotate around the first direction X. It can be understood that when the cross-section of the second through hole 21 perpendicular to the first direction is not circular, the outer periphery of the first sealing portion 4 fits with the side wall of the second through hole 21, and the rotational freedom of the cable 3 is locked.

[0038] Furthermore, when the second through hole 21 is a circular hole, the outer periphery of the first sealing portion 4 can squeeze the side wall of the second through hole 21, that is, the first sealing portion 4 and the second through hole 21 are interference fit, thereby locking the rotational freedom of the first sealing portion 4 and further improving the sealing effect. The specific fitting method to be used can be selected according to actual conditions.

[0039] refer to Figure 1 In an exemplary embodiment, at least two thread grooves 22 are provided on the side of the second structural portion 2 facing away from the first structural portion 1; the extrusion portion 5 may include an extrusion plate 51 and a screw 52, ​​wherein the extrusion plate 51 is provided with a plurality of threaded holes 511 corresponding one-to-one to the thread grooves 22 in the first direction X; the screw 52 corresponds one-to-one to the plurality of threaded holes 511 and is penetrated through the corresponding threaded holes 511 and the corresponding thread grooves 22.

[0040] Specifically, the screw 52 passes through the corresponding threaded hole 511 and is continuously screwed into the corresponding threaded groove 22, which can drive the extrusion plate 51 to continuously approach the second structural part 2 along the first direction X. During the movement of the extrusion plate 51, the first sealing part 4 is pushed to squeeze the first structural part 1, thereby achieving sealing.

[0041] It should be understood that if there are at least two threaded grooves 22, then there are at least two corresponding threaded holes 511 and screws 52. Multiple screws 52 are respectively matched with the corresponding threaded holes 511 and the corresponding threaded grooves 22 to improve the stability of the connection of the extrusion plate 51 and solve the problem that the extrusion plate 51 is prone to rotation when only one screw 52 is matched with the threaded hole 511 and the threaded groove 22.

[0042] In an exemplary embodiment, a U-shaped groove is provided on the pressing plate 51 , and the cable 3 passes through the U-shaped groove.

[0043] Specifically, the extrusion plate 51 can be a single flange pressure plate, which is used to connect with the second structural part 2 on the installation body. The installation body can be a flange. The overflow port 31 on the cable 3 passes through the U-shaped groove on the flange pressure plate. At this time, after the flange pressure plate is connected to the flange by screws 52, the flange pressure plate squeezes the first sealing part 4. In other words, the flange pressure plate squeezes a skirt edge closest to the flange of the overflow port 31, so that the corresponding skirt edge is close to the step surface at the step hole, thereby sealing the gap between the cable 3 and the step hole on the flange; in this way, the flange pressure plate is also convenient to install or disassemble on the periphery of the overflow port 31 through the U-shaped groove, and there can be four threaded grooves 22 that are evenly arranged on the periphery of the cable 3, and there are four corresponding threaded holes 511 and screws 52, so that the position of the extrusion plate 51 fixed by four screws 52 evenly arranged on the periphery of the cable 3 is more stable.

[0044] refer to Figure 1 In an exemplary embodiment, there are two extrusion plates 51 and both are provided with an arc groove 512. The outer periphery of the overflow port 31 is respectively fitted with the side walls of the two arc grooves 512. The two extrusion plates 51 are arranged opposite to each other in the second direction, and the second direction is perpendicular to the first direction X.

[0045] Specifically, Figure 1 As shown, the second direction is the Y direction, and there are two extrusion plates 51, i.e., flange pressure plates. The two flange pressure plates are arranged opposite to each other in the second direction Y, so that the two flange pressure plates and the flange can be connected in sequence. After the connection is completed, compared with the solution of using a single flange pressure plate, the contact area between the two flange pressure plates and the first sealing part 4, i.e., the corresponding skirt is larger. In other words, the two flange pressure plates extrude the corresponding skirt more evenly, and the sealing effect is better.

[0046] Furthermore, the extrusion plate 51 can cooperate with the cable 3 not only through the arc groove 512, but also through the spline and other forms; for example, a through groove is provided on one side of the extrusion plate 51 close to the cable 3, and a strip-shaped external spline cooperating with the through groove is provided on the outer periphery of the cable 3, and the external spline extends along the first direction. When the external spline cooperates with the through groove, the extrusion plate 51 extrude the first sealing part 4 along the first direction and connects with the second structural part 2, so that the first sealing part 4 covers the gap between the cable 3 and the first structural part 1, thereby realizing the sealing between the cable 3 and the flange. At the same time, the external spline conflicts with the side wall of the through groove, and the cable 3 cannot rotate around the first direction, that is, the rotational freedom of the cable 3 is locked.

[0047] It should be understood that when the external spline cooperates with the through slot, it means that the outer periphery of the external spline fits with the side wall of the through slot.

[0048] refer to Figure 3 In the exemplary embodiment, in the first direction X, the maximum distance between the first sealing portion 4 and the first structural portion 1 is a, the maximum distance between the second structural portion 2 and the first structural portion 1 is b, and a>b.

[0049] Specifically, Figure 3 As shown, a is the maximum distance between all points on the first sealing part 4 and the plane where the first structure part 1 is away from the second structure part 2, and b is the maximum distance between all points on the second structure part 2 and the plane where the first structure part 1 is away from the second structure part 2. When a>b, there is a gap between the first sealing part 4 and the extrusion plate 51. The smaller the gap, the greater the force of the first sealing part 4 to squeeze the first structure part 1, and the better the sealing effect, thereby ensuring the reliability of the seal.

[0050] Of course, the value of a may be the same as that of b, but the sealing effect is worse than that of the above solution; if a<b, the extrusion plate 51 cannot push the first sealing part 4 to seal even if it fits the second structural part 2 .

[0051] refer to Figure 1 and Figure 3 In an exemplary embodiment, part of the structure of the overflow port 31 is located in the first through hole 11; the cable locking sealing structure may also include a sealing ring 6, which is located at the outer periphery of the overflow port 31 and contacts the side wall of the first through hole 11.

[0052] It should be understood that when part of the structure of the overflow port 31 is located in the first through hole 11 , the first sealing portion 4 covers the gap between the overflow port 31 and the first structural portion 1 to achieve sealing between the cable 3 and the flange.

[0053] Specifically, the sealing ring 6 and the overflow port 31 may be an integral structure, formed by injection molding at one time, and the sealing ring 6 abuts against the side wall of the first through hole 11 , which can further improve the sealing effect.

[0054] Furthermore, there are multiple sealing rings 6, and the multiple sealing rings 6 are arranged at intervals in the first direction X. The more sealing rings 6 there are, the better the sealing effect is, and the higher the protection level achieved is. The specific number of sealing rings 6 can be selected according to the actual working environment. For example, if the charging equipment is often in a humid environment or in an area with heavy rainfall, the number of sealing rings 6 can be adaptively increased to improve the sealing effect.

[0055] refer to Figure 1 On the basis of the above-mentioned embodiment, the embodiment of the present application further provides a charging device, which may include the above-mentioned cable locking and sealing structure and a shell 7, wherein a threading hole is provided on the side wall of the shell 7, the first structure part 1 is installed on the outer side of the shell 7, and the cable 3 passes through the threading hole; wherein the second structure part 2 is located on the side of the first structure part 1 away from the shell 7.

[0056] Specifically, the charging device may include a charging pile, a charger, a power module, etc., and the first structural part 1 can be installed on the housing 7 of the above-mentioned charging device, and the cable 3 can pass through the threading hole on the housing 7.

[0057] It should be noted that the first structural part 1 can be installed on the outside of the shell 7, and the cable 3 can be passed through the threading hole; further, the first structural part 1 can also be fixed to the inner periphery of the threading hole, and the outer periphery of the first structural part 1 is fitted with the side wall of the threading hole, which can save space and make the charging device further miniaturized and lightweight.

[0058] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A cable locking and sealing structure, characterized in that: include: The mounting body comprises a first structural part (1) and a second structural part (2) which are arranged in sequence in a first direction, wherein the first structural part (1) and the second structural part (2) are respectively provided with a first through hole (11) and a second through hole (21) extending along the first direction, the first direction being the same as the thickness direction of the first structural part (1), wherein the orthographic projection of the second through hole (21) along the first direction on a side of the first structural part (1) facing the second structural part (2) covers the first through hole (11); A cable (3) is inserted into the first through hole (11) and the second through hole (21) and has the freedom to rotate about the first direction, and an overflow port (31) is sleeved on the outer periphery of the cable (3); a first sealing portion (4) located at the outer periphery of the overflow port (31), wherein a side of the first sealing portion (4) facing the first structural portion (1) is located in the second through hole (21) and contacts the first structural portion (1), wherein the first sealing portion (4) covers a gap between the first through hole (11) and the cable (3); An extrusion portion (5) is connected to a side of the second structural portion (2) facing away from the first structural portion (1), wherein the first sealing portion (4) is located between the extrusion portion (5) and the first structural portion (1) and contacts the extrusion portion (5).

2. The cable locking and sealing structure according to claim 1, characterized in that: The first sealing portion (4) cooperates with the second through hole (21) to lock the rotational freedom of the cable (3).

3. The cable locking and sealing structure according to claim 1, characterized in that: In the first direction, the maximum distance between the first sealing portion (4) and the first structural portion (1) is a, the maximum distance between the second structural portion (2) and the first structural portion (1) is b, and a>b.

4. The cable locking and sealing structure according to claim 1, characterized in that: At least two thread grooves (22) are provided on a side of the second structural portion (2) facing away from the first structural portion (1); the extrusion portion (5) comprises: An extrusion plate (51) is provided with a plurality of threaded holes (511) corresponding one-to-one to the threaded grooves (22) in the first direction; The screws (52) correspond to the plurality of threaded holes (511) one by one and are inserted through the corresponding threaded holes (511) and the corresponding threaded grooves (22).

5. The cable locking and sealing structure according to claim 4, characterized in that: The extrusion plate (51) is provided with a U-shaped groove, and the cable (3) passes through the U-shaped groove.

6. The cable locking and sealing structure according to claim 4, characterized in that: There are two extrusion plates (51), both of which are provided with an arc-shaped groove (512); the outer periphery of the overflow port (31) is respectively fitted with the side walls of the two arc-shaped grooves (512); the two extrusion plates (51) are arranged opposite to each other in a second direction, and the second direction is perpendicular to the first direction.

7. The cable locking and sealing structure according to claim 1, characterized in that: Part of the structure of the overflow port (31) is located in the first through hole (11); the cable locking and sealing structure also includes: A sealing ring (6) is located at the outer periphery of the overflow port (31) and contacts the side wall of the first through hole (11).

8. The cable locking and sealing structure according to claim 7, characterized in that: There are a plurality of sealing rings (6), and the plurality of sealing rings (6) are arranged at intervals in the first direction.

9. The cable locking and sealing structure according to claim 1, characterized in that: The overflow port (31) and the outer covering of the cable (3) are both made of soft rubber material.

10. A charging device, characterized in that: include: The cable locking and sealing structure according to any one of claims 1 to 9; The housing (7) has a wire threading hole on its side wall, the first structural part (1) is mounted on the outside of the housing (7), and the cable (3) passes through the wire threading hole; Wherein, the second structural portion (2) is located on a side of the first structural portion (1) facing away from the housing (7).

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