Telescopic cord assembly and charging device

Abstract

The utility model discloses telescopic wire assembly and charging equipment, including shell, the reel in the shell, the telescopic wire of winding in the reel and the elastic part, be equipped with connecting shaft in the shell, and the reel is movably sleeved in the connecting shaft, be equipped with the cavity on the reel, and the connecting shaft part is located in the cavity, and the elastic part is received in the cavity, and the both ends of elastic part are connected with connecting shaft and reel respectively, and the cavity has stored damping liquid, and the elastic part is at least partly immersed in the damping liquid. Through setting up damping liquid in the cavity of accommodating elastic part, and the elastic part is at least partly immersed in the damping liquid, and the elastic part drives the reel to rotate in the process of deformation, and the elastic part will agitate damping liquid and produce damping, and then play the role of hindering the deformation of elastic part, thereby reduce the rotation speed of reel, to reduce the recovery speed of telescopic wire, thereby reduce the risk of telescopic wire beating hand.

Description

Technical Field

[0001] This utility model relates to the field of cable storage technology, and in particular to a telescopic cable assembly and charging device. Background Technology

[0002] As people's demands for quality of life increase, products using retractable cords are becoming increasingly common in people's daily lives, such as chargers, clotheslines, and tow ropes. Retractable cords have a telescopic function, allowing people to choose to pull the cord out to the appropriate length when needed, and to store the cord inside the housing when not in use, preventing the cord from taking up space and affecting storage when not in use.

[0003] However, existing retractable cord products retract at a relatively fast speed, which may cause the end of the cord to swing and hit your hand, affecting the user experience. Utility Model Content

[0004] In view of this, the present invention provides a retractable cord assembly and a charging device to solve the problem of hand injury caused by excessively fast cord retraction in the prior art.

[0005] On one hand, this application provides a telescopic cable assembly, including a housing, a spool located inside the housing, a telescopic cable wound on the spool, and an elastic element, wherein a connecting shaft is provided inside the housing, and the spool is movably sleeved on the connecting shaft;

[0006] The reel has a cavity, the connecting shaft is located in the cavity, the elastic element is housed in the cavity, and both ends of the elastic element are connected to the connecting shaft and the reel, respectively. The cavity contains damping fluid, and the elastic element is at least partially immersed in the damping fluid.

[0007] On the other hand, this application also provides a charging device, including a charging component and a retractable cable assembly as described above, wherein the charging component is located inside the housing and electrically connected to the retractable cable.

[0008] Beneficial effects: By placing damping fluid in the cavity containing the elastic element, the elastic element is at least partially immersed in the damping fluid. During the process of the elastic element rotating the reel due to deformation, the elastic element will agitate the damping fluid and generate damping, thereby hindering the deformation of the elastic element and reducing the release speed of the elastic element. Since the release speed of the elastic element is positively correlated with the rotation speed of the reel, reducing the release speed of the elastic element can reduce the rotation speed of the reel, thereby reducing the retraction speed of the telescopic line and thus reducing the risk of the telescopic line hitting the hand. Attached Figure Description

[0009] Figure 1This is a schematic diagram of the structure of a charging device provided in an embodiment of the present invention;

[0010] Figure 2 for Figure 1 An exploded view of the charging device shown;

[0011] Figure 3 for Figure 2 A schematic diagram of the telescopic line assembly shown in the diagram when the cover plate is separated from the enclosure wall;

[0012] Figure 4 for Figure 3 A schematic diagram of the structure of the winding reel shown;

[0013] Figure 5 for Figure 3 The diagram shown is an exploded view of the telescopic cable assembly with the telescopic cable removed.

[0014] Figure 6 for Figure 3 The diagram shows the assembly of the main body of the winding coil, the surrounding wall, the elastic element, the connecting shaft, the sleeve, and the stop bar.

[0015] Figure 7 for Figure 6 The diagram shows an exploded view of the connecting shaft, sleeve, and stop bar.

[0016] In the diagram: 100, charging equipment; 10, telescopic cable assembly; 12, cable reel; 14, telescopic cable; 16, elastic element; 18, outer shell; 20, charging component; 22, cavity; 24, cable reel body; 26, enclosure; 28, cover plate; 30, protrusion; 32, installation notch; 34, buckle body; 36, buckle hole; 38, stop bar; 40, protrusion; 42, guide hole; 44, connecting shaft; 46, sleeve; 48, limiting block; 50, limiting groove; 52, stepped structure; 54, fixing post. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, inside, outside, top, bottom, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0019] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, the component may be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it may be directly connected to the other component or there may be an intervening component present.

[0020] Please see Figures 1 to 7 An embodiment of this utility model provides a telescopic cable assembly 10, including a cable reel 12, a telescopic cable 14, an elastic element 16, and a housing 18. A connecting shaft 44 is provided inside the housing 18, and the connecting shaft 44 is fixed relative to the housing 18. The cable reel 12 and the elastic element 16 are located inside the housing 18. The cable reel 12 is movably sleeved on the connecting shaft 44, allowing the cable reel 12 to rotate relative to the housing 18 around the connecting shaft 44. Both ends of the elastic element 16 are connected to the connecting shaft 44 and the cable reel 12, respectively. The telescopic cable 14 is wound around the cable reel 12. When the telescopic cord 14 is pulled outward under the action of external force, the telescopic cord 14 drives the reel 12 to rotate in one direction (i.e., the direction of cord output). The reel 12 rotates relative to the connecting shaft 44. The two ends of the elastic element 16 are connected to the reel 12 and the connecting shaft 44 respectively. Therefore, when the reel 12 rotates in the direction of cord output, it will cause the elastic element 16 to deform and store elastic potential energy. After the telescopic cord 14 is released, the external force acting on the telescopic cord 14 disappears. The elastic element 16 releases the stored elastic potential energy to return to the initial state and drives the reel 12 to rotate in the opposite direction (i.e., the direction of cord retraction), causing the telescopic cord 14 to retract and rewind onto the reel 12, forming an automatic cord retraction effect.

[0021] The retractable cord assembly 10 can be used in electronic products such as chargers or power banks, in which case the retractable cord 14 is a wire. Alternatively, the retractable cord assembly 10 can also be used in everyday items such as clotheslines or tow ropes, in which case the retractable cord 14 is a rope. The following description uses the retractable cord assembly 10 used in charging device 100 as an example.

[0022] The charging device 100 includes a charging component 20 and a retractable cable assembly 10. Both the charging component 20 and the retractable cable assembly 10 are installed inside the housing 18. The retractable cable 14 of the retractable cable assembly 10 is a charging cable. The charging cable is electrically connected to the charging component 20, and one end of the charging cable extends out of the outer side of the housing 18 for connecting to electronic devices such as mobile phones, thereby charging the electronic devices.

[0023] Understandably, the charging device 100 can be a product with its own power source, such as a power bank, or a product that requires an external power source, such as a charger. In this embodiment, the charging device 100 is a charger, which includes prongs and is connected to an external power source through the prongs.

[0024] In one embodiment, the reel 12 has a cavity 22, which is a sealed cavity to prevent liquid leakage. The elastic element 16 is housed inside the cavity 22. The connecting shaft 44 is partially located inside the cavity 22. One end of the elastic element 16 is fixed relative to the reel 12, and the other end is fixed to the portion of the connecting shaft 44 located inside the cavity 22. The cavity 22 stores damping fluid, and the elastic element 16 is at least partially immersed in the damping fluid. When the elastic element 16 returns to its original shape and drives the reel 12 to rotate to achieve the winding process, the deformation of the elastic element 16 agitates the damping fluid and generates damping. The damping can hinder the deformation of the elastic element 16, thereby slowing down the release rate of the elastic potential energy of the elastic element 16 and prolonging the time for the elastic element 16 to return to its original state. This reduces the rotation speed of the reel 12, thereby reducing the winding speed of the telescopic cable 14 and thus reducing the risk of the telescopic cable 14 hitting the hand due to excessive winding speed. Furthermore, the elastic element 16 generates heat when it deforms, which can be transferred to the damping fluid to cool the elastic element 16 and extend its service life.

[0025] In one optional example, the elastic element 16 is a coil spring, which is housed entirely within the cavity 22. When the telescopic cord 14 is pulled outward under external force, causing the reel 12 to rotate, the coil spring gradually tightens and stores elastic potential energy. After the external force disappears, the coil spring releases the stored elastic potential energy and drives the reel 12 to rotate, thereby achieving the effect of automatic cord winding. During the rotation of the reel 12 driven by the coil spring, the release speed of the coil spring is positively correlated with the rotation speed of the reel 12; that is, the faster the release speed of the coil spring, the faster the rotation speed of the reel 12, and the slower the release speed of the coil spring, the slower the rotation speed of the reel 12.

[0026] The elastic element 16 is at least partially immersed in the damping fluid. This can mean that the elastic element 16 is partially immersed in the damping fluid, or it can mean that the elastic element 16 is completely immersed in the damping fluid. No limitation is made here.

[0027] The damping fluid is preferably an insulating and non-corrosive damping oil. The damping oil has good viscosity resistance, which is beneficial to increasing the damping force between it and the elastic element 16. The insulation can prevent the damping fluid from contacting the charging component 20 when it leaks, thus preventing the risk of short circuit and damage. The non-corrosiveness can prevent the damping fluid from corroding the elastic element 16 and affecting its service life.

[0028] In an alternative example, the damping fluid can be silicone oil, which is chemically stable, non-corrosive to metals, and will not affect the mechanical properties of the elastic element 16 with long-term contact, and has high insulation resistance (>10). 12Even if leakage occurs (Ω·cm), it will not cause a short circuit in the charging component 20; alternatively, the damping fluid can be a perfluoropolyether oil, which is chemically stable, completely inert, and compatible with all metals, thus not affecting the mechanical properties of the elastic element 16, and has good insulation properties (volume resistivity > 10 Ω·cm). 14 The perfluoropolyether oil (Ω·cm) will not cause a short circuit in the charging component 20 even if it leaks. At the same time, the perfluoropolyether oil is volatile and will not leave any residue after evaporation, thus not damaging the electronic components on the charging component 20.

[0029] Specifically, this application does not limit the specific composition of the damping liquid; any liquid that can dampen the deformation of the elastic element 16 can be used as the damping liquid in this application. In other embodiments, the damping liquid may also be water (H2O), mineral oil, polyethylene glycol, etc., and is not limited here.

[0030] The reel 12 includes a reel body 24, a surrounding wall 26, and a cover plate 28. The telescopic cable 14 is wound around the reel body 24. The surrounding wall 26 protrudes from the reel body 24 on the side away from the telescopic cable 14 and is annular. The cover plate 28 is located on the side of the surrounding wall 26 away from the reel body 24. The reel body 24, the surrounding wall 26, and the cover plate 28 enclose a cavity 22, with the elastic element 16 located inside the surrounding wall 26. By having the cover plate 28 located on the side of the surrounding wall 26 away from the reel body 24, the damping fluid inside the cavity 22 can be sealed, preventing leakage of the damping fluid from the cavity 22 during the operation of the telescopic cable assembly 10. Furthermore, by providing the surrounding wall 26 on the side of the reel body 24 away from the telescopic cable 14 to accommodate the elastic element 16 and the damping fluid, the elastic element 16 will not be interfered with by the telescopic cable 14 and the reel body 24 during assembly, which helps to reduce the assembly difficulty of the telescopic cable assembly 10.

[0031] The winding body 24 includes a substrate 25 and a mounting portion 27 protruding from one side of the substrate 25. The mounting portion 27 and the surrounding wall 26 are located on opposite sides of the substrate 25, respectively. The mounting portion 27 is located in the middle of the substrate 25 and cooperates with the substrate 25 to form a take-up groove 29. One end of the telescopic wire 14 is fixed to the mounting portion 27 and can be wound around the outer periphery of the mounting portion 27, thereby being housed in the take-up groove 29.

[0032] Optionally, the enclosure 26 and the winding body 24 are integrally formed to avoid gaps between the enclosure 26 and the winding body 24 that could lead to leakage of the damping fluid, thus enhancing the sealing effect of the cavity 22. Alternatively, the enclosure 26 and the winding body 24 can be separately formed, allowing for individual fabrication of the enclosure 26 and the winding body 24, increasing the precision of their fabrication.

[0033] Optionally, the cover plate 28 and the enclosure wall 26 are connected separately. During assembly, the cover plate 28 can be separated from the enclosure wall 26 first, then the elastic element 16 can be installed on the inside of the enclosure wall 26, and damping fluid can be injected. Finally, the cover plate 28 can be put back on for easy assembly. Alternatively, the cover plate 28 and the enclosure wall 26 can be integrally formed, which can further increase the sealing of the cavity 22 and further prevent leakage of damping fluid.

[0034] Understandably, in order to further enhance the sealing effect of the cavity 22, a sealing treatment can be performed at the connection between the cover plate 28 and the enclosure wall 26. For example, a sealing ring can be provided between the cover plate 28 and the enclosure wall 26, or a waterproof adhesive can be provided at the connection between the cover plate 28 and the enclosure wall 26 to prevent the damping liquid in the cavity 22 from leaking from the gap between the cover plate 28 and the enclosure wall 26.

[0035] The outer periphery of the cover plate 28 is provided with a protrusion 30, and the side of the enclosure wall 26 near the cover plate 28 is provided with an installation notch 32. The shape of the protrusion 30 is adapted to the shape of the installation notch 32. The protrusion 30 is located inside the installation notch 32 to improve the compactness of the structure and to improve the sealing effect of the cavity 22.

[0036] Optionally, there are multiple mounting notches 32 and multiple protrusions 30, each corresponding to the other. Multiple mounting notches 32 are spaced apart along the circumference of the enclosure wall 26, and multiple protrusions 30 are spaced apart along the circumference of the cover plate 28.

[0037] A snap-fit ​​structure is provided between the cover plate 28 and the enclosure wall 26. The snap-fit ​​structure includes a snap-fit ​​body 34 protruding from the outer periphery of the cover plate 28 and a snap-fit ​​hole 36 correspondingly located on the inner side of the enclosure wall 26. The snap-fit ​​body 34 is located between two adjacent protrusions 30. When the cover plate 28 is installed onto the enclosure wall 26, the protrusions 30 are located within the mounting notch 32, and the snap-fit ​​body 34 is located within the snap-fit ​​hole 36. The mounting notch 32 and the protrusions 30 can limit the cover plate 28 in the circumferential direction. The engagement of the snap-fit ​​body 34 and the snap-fit ​​hole 36 can limit the cover plate 28 in the axial direction, thereby enhancing the connection strength between the enclosure wall 26 and the cover plate 28. The enclosure wall 26 is annular, with the circumferential direction being the circumferential direction of the enclosure wall 26 and the axial direction being the direction of the central axis of the enclosure wall 26.

[0038] Optionally, there are multiple buckle bodies 34 and buckle holes 36, each corresponding to the other. A buckle body 34 is provided between each pair of adjacent protrusions 30, and the buckle body 34 is spaced a certain distance from the two adjacent protrusions 30.

[0039] In one embodiment, a stop bar 38 is provided inside the cavity 22. The stop bar 38 is at least partially immersed in damping fluid. The stop bar 38 is fixed relative to the reel 12, or the reel 12 rotates relative to the stop bar 38. The stop bar 38 can be spaced apart from the elastic member 16 in the thickness direction of the telescopic cable assembly 10 to prevent interference between the stop bar 38 and the elastic member 16, which would affect the lead-out and take-up of the telescopic cable 14. There can be one or more stop bars 38.

[0040] The fact that the shift lever 38 is at least partially submerged in the damping fluid can mean that the shift lever 38 is partially submerged in the damping fluid, or it can mean that the shift lever 38 is completely submerged in the damping fluid, without limitation here.

[0041] When the stop lever 38 is fixed relative to the reel 12, the reel 12 can drive the stop lever 38 to rotate together. Since the rotation speed of the stop lever 38 is different from the flow speed of the damping fluid in the cavity 22, relative motion will occur. The stop lever 38 is at least partially inside the damping fluid, and the damping fluid will generate resistance to the stop lever 38. This resistance will hinder the movement of the stop lever 38. Since the stop lever 38 is fixed relative to the reel 12, this resistance will indirectly act on the reel 12 through the stop lever 38. The rotation of the reel 12 needs to overcome the resistance, which will hinder the rotation of the reel 12, thereby reducing the rotation speed of the reel 12 during the winding process, and further reducing the winding speed.

[0042] When the reel 12 is not fixed to the stop lever 38, for example, when the stop lever 38 is fixed to the connecting shaft 44, the reel 12 will move relative to the stop lever 38. The damping fluid in the cavity 22 flows under the action of the reel 12, and therefore will also move relative to the stop lever 38. The stop lever 38 will resist the flow of the damping fluid, hindering its flow. The damping fluid flows in the same direction as the reel 12 under the action of the reel 12. When the resistance hinders the flow of the damping fluid, the resistance will indirectly act on the reel 12 through the damping fluid. The rotation of the reel 12 needs to overcome the resistance, thus hindering the rotation of the reel 12. Similarly, it can also reduce the rotation speed of the reel 12 during the winding process, thereby reducing the winding speed. By setting a stop lever 38 inside the cavity 22, and regardless of whether the stop lever 38 can rotate with the winding reel 12, relative movement can be generated between the stop lever 38 and the damping liquid, thereby generating resistance to the rotation of the stop lever 38 or resistance to the flow of the damping liquid. The resistance is indirectly applied to the winding reel 12 through the stop lever 38 or the damping liquid, hindering the rotation of the winding reel 12, thereby reducing the rotation speed of the winding reel 12 and thus reducing the winding speed.

[0043] Understandably, when the stop lever 38 and the reel 12 need to be relatively fixed, the stop lever 38 can be directly fixed to the reel 12, for example, directly fixed to the wall 26 or cover plate 28 of the reel 12, or the stop lever 38 can be fixed to an intermediate element that is relatively fixed to the reel 12, as long as the reel 12 can drive the stop lever 38 to rotate. When the reel 12 needs to rotate relative to the stop lever 38, the stop lever 38 can be fixed to the connecting shaft 44.

[0044] The elastic element 16 has a ring structure, and the stop lever 38 is located on one axial side of the elastic element 16 and is spaced a certain distance from the elastic element 16. The side of the stop lever 38 near the elastic element 16 is provided with a protrusion 40, which is at least partially located in the damping fluid and is spaced apart from the elastic element 16.

[0045] "The protrusion 40 is at least partially located within the damping fluid" can mean that part of the protrusion 40 is located within the damping fluid, or it can mean that all of the protrusion 40 is located within the damping fluid; there is no limitation here.

[0046] The protrusion 40 is located within the damping fluid, thus increasing the contact area between the stop lever 38 and the damping fluid, thereby enhancing the damping force between the stop lever 38 and the damping fluid, and further increasing the rotational speed of the coil 12. Optionally, multiple protrusions 40 may be present to further increase the contact area between the stop lever 38 and the damping fluid.

[0047] In other embodiments, the protrusion 40 may also be located on the side of the stop bar 38 away from the elastic member 16, as long as the protrusion 40 is located within the damping fluid.

[0048] The elastic element 16 is annular, and the stop lever 38 extends radially along the elastic element 16. Multiple protrusions 40 are spaced apart along the length direction of the stop lever 38, forming guide holes 42 between adjacent protrusions 40. When the stop lever 38 moves relative to the damping fluid, the damping fluid passes through the guide holes 42 and comes into contact with the inner wall of the guide holes 42, generating friction. The guide holes 42 increase the effective contact area between the stop lever 38 and the damping fluid. The magnitude of the damping force is proportional to the effective contact area and the relative speed, thus increasing the damping force between the stop lever 38 and the damping fluid, thereby further reducing the take-up speed.

[0049] Optionally, the diameter of each guide hole 42 gradually increases in the direction away from the stop lever 38, making the guide hole 42 arched, i.e., the guide hole 42 is an arched hole. When the stop lever 38 and the damping fluid generate relative motion, the solid structure will only roughly push the fluid away, and the flow path will be relatively chaotic. However, the arched hole is equivalent to a guide vane, which can guide the damping fluid to generate directional vortices, making the damping effect more stable and uniform. Moreover, the generation and maintenance of directional vortices will continuously consume energy, which can increase the damping force between the stop lever 38 and the damping fluid, and further reduce the take-up speed.

[0050] In one alternative example, a guide hole 42 is formed between any two adjacent protrusions 40, and the multiple guide holes 42 are evenly spaced along the length of the stop bar 38, and the multiple guide holes 42 are all the same in shape and size. Specifically, the guide holes 42 are semi-circular.

[0051] In one embodiment, the stop lever 38 is mounted on the connecting shaft 44, that is, the stop lever 38 is fixedly mounted on the connecting shaft 44, so that the stop lever 38 and the connecting shaft 44 remain relatively fixed and cannot rotate relative to each other. The winding reel 12 rotates relative to the connecting shaft 44 and the stop lever 38. Alternatively, the stop lever 38 is movably connected to the connecting shaft 44, so that the stop lever 38 can rotate relative to the connecting shaft 44. In this case, the stop lever 38 can be fixedly connected to the winding reel 12, and the winding reel 12 drives the stop lever 38 to rotate relative to the connecting shaft 44.

[0052] A sleeve 46 is provided on the outer side of the connecting shaft 44. The sleeve 46 is fitted onto the outer side of the connecting shaft 44 and is relatively fixed to the connecting shaft 44. The stop lever 38 is fixed on the outer side of the sleeve 46, and the stop lever 38 is indirectly installed on the connecting shaft 44 through the sleeve 46. By simply fitting the sleeve 46 onto the outer side of the connecting shaft 44, the stop lever 38 can be installed onto the connecting shaft 44. The installation operation is simple and can reduce the assembly difficulty.

[0053] A limiting block 48 is provided on the inner side of the sleeve 46, and a limiting groove 50 is provided on the connecting shaft 44. The limiting block 48 is inserted into the limiting groove 50, thereby keeping the connecting shaft 44 and the sleeve 46 relatively fixed in the circumferential direction and preventing possible slippage between the sleeve 46 and the connecting shaft 44. Moreover, by setting the limiting block 48, it is only necessary to align the limiting block 48 on the sleeve 46 with the limiting groove 50 on the connecting shaft 44, and then push the limiting block 48 along the connecting shaft 44 to complete the circumferential fixation of the limiting groove 50. This eliminates the need for complex tooling and greatly improves the difficulty of production and assembly. Furthermore, the simple structure of the sleeve 46 and the connecting shaft 44 forming a circumferential fixation further reduces the difficulty of production and assembly.

[0054] The limiting block 48 extends radially along the sleeve 46, and the two ends of the limiting block 48 are respectively connected to the opposite sides of the sleeve 46, thereby enhancing the overall strength of the sleeve 46 and improving the reliability of the connection between the sleeve 46 and the connecting shaft 44.

[0055] One end of the connecting shaft 44 is provided with a stepped structure 52, and the sleeve 46 is sleeved on the outside of the connecting shaft 44 and located inside the stepped structure 52. The stepped structure 52 can limit the sleeve 46 in the axial direction of the connecting shaft 44.

[0056] The outer side of the sleeve 46 is provided with a plurality of stops 38, which are spaced apart circumferentially along the sleeve 46 and extend radially along the sleeve 46. Each stop 38 is at least partially located within the damping fluid to further increase the contact area with the damping fluid, thereby increasing the damping force. In an optional example, the outer side of the sleeve 46 is provided with two stops 38, and the two stops 38 form an obtuse angle between them.

[0057] Optionally, the sleeve 46, the stop bar 38, and the limit block 48 are integrally formed to ensure overall strength and eliminate the need for assembly.

[0058] In other embodiments, the sleeve 46 may also be movably fitted onto the outside of the connecting shaft 44. When the stop lever 38 is fixed relative to the reel 12, for example, when the end of the stop lever 38 away from the sleeve 46 is fixed to the reel 12, the reel 12 can drive the sleeve 46 and the stop lever 38 to rotate relative to the connecting shaft 44.

[0059] In an optional example, a mounting plate 53 is installed inside the housing 18 and is fixedly connected to the housing 18. The charging assembly 20 and the cable reel 12 are located on opposite sides of the mounting plate 53. One end of the connecting shaft 44 is fixedly connected to the mounting plate 53, and the other end is inserted into or passes through the cavity 22. A stepped structure 52 is provided at the end of the connecting shaft 44 near the mounting plate 53. The cable reel 12 is movably sleeved on the connecting shaft 44. The stepped structure 52 supports the cable reel 12 and keeps the cable reel 12 a certain distance away from the mounting plate 53, thereby rotatably mounting the cable reel 12 inside the housing 18. The cable reel 12 can rotate relative to the housing 18 around the connecting shaft 44.

[0060] In one embodiment, a fixed post 54 protrudes from the cavity 22. One end of the elastic element 16 is connected to the fixed post 54. When the reel 12 rotates under tension, it drives the fixed post 54 to rotate as well. The fixed post 54 then drives the end of the elastic element 16 connected to it to move, thereby tightening the elastic element 16 and generating elastic force. After the tension disappears, the elastic element 16 releases the elastic force and drives the fixed post 54 to move, which in turn drives the reel 12 to move, realizing the winding operation.

[0061] The fixing post 54 is fixed to the base plate of the winding body 24 and is disposed near the enclosure wall 26. The length of the stop bar 38 is less than the distance between the fixing post 54 and the connecting shaft 44. That is, the distance between the end of the stop bar 38 away from the connecting shaft 44 and the connecting shaft 44 is less than the distance between the fixing post 54 and the connecting shaft 44, so as to prevent the fixing post 54 from interfering with the stop bar 38 during the rotation of the winding reel 12.

[0062] In one embodiment, the winding body 24 is provided with a through hole that passes through the mounting part and the substrate and communicates with the cavity 22. One end of the connecting shaft 44 is located outside the winding reel 12, and the other end passes through the through hole on the mounting part and the substrate in sequence and extends into or through the cavity 22. The connecting shaft 44, the mounting part and the substrate are coaxially arranged, that is, the central axes of the three are collinear.

[0063] A sealing ring is provided between the connecting shaft 44 and the winding body 24. The sealing ring surrounds the outer periphery of the connecting shaft 44 to enhance the sealing performance of the cavity 22 and prevent the damping fluid in the cavity 22 from flowing out from the gap between the connecting shaft 44 and the inner wall of the perforation.

[0064] Optionally, a through hole is provided at the center of the cover plate 28, one end of the connecting shaft 44 passes through the through hole on the cover plate 28 and is connected to the housing 18 of the charging device, and the sleeve 46 is located between the connecting shaft 44 and the cover plate 28. A sealing ring is provided between the cover plate 28 and the sleeve 46 to prevent the damping fluid in the cavity 22 from flowing out from the gap between the connecting shaft 44 and the cover plate 28.

[0065] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A telescopic cable assembly, characterized in that, It includes a housing, a reel located inside the housing, a telescopic cord wound around the reel, and an elastic element. The housing is provided with a connecting shaft, and the reel is movably sleeved on the connecting shaft. The reel has a cavity, the connecting shaft is located in the cavity, the elastic element is housed in the cavity, and both ends of the elastic element are connected to the connecting shaft and the reel, respectively. The cavity contains damping fluid, and the elastic element is at least partially immersed in the damping fluid.

2. The telescopic cable assembly according to claim 1, characterized in that, The cavity is provided with a stop lever, which is at least partially located within the damping fluid. The stop bar is fixed relative to the winding reel, or the winding reel is rotatable relative to the stop bar.

3. The telescopic cable assembly according to claim 2, characterized in that, The stop lever has a protrusion on the side near or away from the elastic element, and the protrusion is at least partially located within the damping fluid.

4. The telescopic cable assembly according to claim 3, characterized in that, The number of protrusions is multiple, and the multiple protrusions are arranged at intervals along the length direction of the stop bar, forming a guide hole between adjacent protrusions.

5. The telescopic cable assembly according to claim 2, characterized in that, The stop bar is fixed relative to the connecting shaft, or the winding reel drives the stop bar to rotate relative to the connecting shaft.

6. The telescopic cable assembly according to claim 5, characterized in that, A sleeve is fitted on the outside of the connecting shaft, and the stop bar is fixed on the outside of the sleeve.

7. The telescopic cable assembly according to claim 6, characterized in that, The sleeve has a limiting block inside, and the connecting shaft has a corresponding limiting groove. The limiting block is inserted into the limiting groove to keep the sleeve and the connecting shaft circumferentially fixed.

8. The telescopic cable assembly according to claim 5, characterized in that, The cavity is provided with a fixed post, one end of the elastic element is connected to the fixed post, and the length of the stop bar is less than the distance between the fixed post and the connecting shaft.

9. The telescopic cable assembly according to any one of claims 1-8, characterized in that, The reel includes a reel body for winding the telescopic cord, a wall protruding from the reel body on the side away from the telescopic cord, and a cover plate disposed on the side of the wall away from the reel body. The reel body, the wall, and the cover plate together form the cavity.

10. A charging device, characterized in that, It includes a charging component and a retractable cable assembly as described in any one of claims 1-9, wherein the charging component is located within the housing and is electrically connected to the retractable cable.

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