Charging plug for underwater equipment and charging assembly for pool cleaning equipment

Abstract

The present application provides a charging plug (10) for underwater equipment, comprising: a housing (100), the housing comprising an end face (101); the output electrode (200) is located in the shell (100) and extends from the interior of the shell (100) to the end face (101), the output electrode (200) comprises a groove, and the groove is used for containing an external receiving electrode (400) and supplying power to the external receiving electrode (400); the water drop removing device (300) is at least partially located in front of the output electrode (200), so that when the external receiving electrode (400) is inserted into the output electrode (200), the external receiving electrode (400) penetrates through the water drop removing device.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure relates to the technical field of a charging plug for underwater equipment, in particular to a charging plug for underwater equipment and a charging assembly for a pool cleaning device. BACKGROUND

[0002] With the increasing frequency of use and application scenarios of underwater cleaning equipment, charging the underwater cleaning equipment becomes an important step. At present, the charging assembly of the underwater cleaning equipment is in a water environment, and there is a water film between the output electrode and the receiving electrode. In the electrified state, the electrode surface is in contact with water, forming a micro-electrolytic cell. Under the action of the electric field, the positive electrode will be electrolytic corrosion, and the electrode will be corroded quickly, losing the charging function, and the service life of the charging assembly is very short. Therefore, in order to safely, efficiently and durably charge the underwater cleaning equipment, it can only be transported to a dry environment, which is extremely inconvenient to operate and affects the user experience. CONTENT OF THE UTILITY MODEL

[0003] The present application aims at the shortcomings of the prior art and provides a charging plug for underwater equipment, which is not prone to electrolytic corrosion.

[0004] The present application provides a charging plug for underwater equipment, comprising: a shell, the shell comprising an end face; an output electrode, the output electrode being located inside the shell and extending from the inside of the shell to the end face, the output electrode comprising a groove for accommodating an external receiving electrode and supplying power to the external receiving electrode; a water droplet removal device, the water droplet removal device being at least partially located in front of the output electrode, so that when the external receiving electrode is inserted into the output electrode, it has passed through the water droplet removal device.

[0005] Further, the output electrode comprises a first electrode and a second electrode, and the water droplet removal device comprises two water droplet removal rings corresponding to the first electrode and the second electrode respectively.

[0006] Further, the shell is an insulating shell.

[0007] Further, the water droplet removal device is made of a flexible material.

[0008] Further, the water droplet removal device comprises a hole, and the hole allows the receiving electrode to pass through.

[0009] Further, when the receiving electrode passes through the water droplet removal device, the water droplet removal device can deform, so as to squeeze the water droplets off the receiving electrode.

[0010] Further, the water droplet removal device is integrally formed with the shell.

[0011] Furthermore, the water droplet removal device includes a guiding structure that guides the receiving electrode into the water droplet removal device.

[0012] Furthermore, the water droplet remover includes an absorbent material, and when the receiving electrode enters the water droplet remover, at least a portion of the water droplets on the receiving electrode are absorbed by the absorbent material.

[0013] Furthermore, the aperture of the water droplet removal device is adapted to the diameter of the receiving electrode, so that water droplets on the receiving electrode are removed from the receiving electrode when the receiving electrode enters the aperture.

[0014] This application also provides a charging component for a pool cleaning device, including an external receiving electrode and a charging plug as described above, wherein the external receiving electrode is disposed at the charging port of the pool cleaning device.

[0015] Furthermore, the receiving electrode is columnar or sheet-shaped and protrudes relative to the end face of the charging port.

[0016] The embodiments described in this application have the following beneficial effects:

[0017] The charging plug provided in this application can remove water from the surface of the receiving electrode when the output electrode and the receiving electrode are combined using a water droplet removal device inside its casing. This creates a "waterless" environment on the contact surface between the output electrode and the receiving electrode. As a result, the two electrodes will not undergo electrolytic corrosion when energized, greatly extending the life of the electrodes. Thus, the charging plug and the external receiving electrode together form a charging assembly that can be used in pool cleaning equipment, allowing it to be charged without leaving the pool. This simplifies the operation, improves cleaning efficiency, and enhances the user experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings in the following description are merely exemplary embodiments of this disclosure.

[0019] Figure 1 This is a longitudinal cross-sectional view of a charging plug according to an embodiment of this application.

[0020] Figure 2A This is a schematic diagram of a charging component for a pool cleaning device according to an embodiment of this application.

[0021] Figure 2B The illustration schematically shows the charging state of a charging component for a pool cleaning device according to an embodiment of this application.

[0022] Label Explanation

[0023] 10. Charging plug; 100. Housing; 101. End face; 200. Output electrode; 201. First electrode; 202. Second electrode; 300. Water droplet removal device; 400. External receiving electrode; 20. Water tank cleaning equipment. Detailed Implementation

[0024] The embodiments of this disclosure will now be described with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the protection scope of this application. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0025] This application provides a charging plug 10 and a charging component for a pool cleaning device 20. The pool cleaning device 20 can be an automatic cleaning device, a cleaning robot, or a similar device that can clean pool-shaped structures. This application does not limit the specific presentation of the pool cleaning device or the pool-shaped structure.

[0026] The charging plug 10 of this application will now be described in detail with reference to the accompanying drawings.

[0027] Reference Figure 1 This application provides a charging plug 10 for underwater equipment, comprising: a housing 100, the housing 100 including an end face 101; an output electrode 200 located inside the housing 100 and extending from the inside of the housing 100 toward the end face 101, the output electrode 200 including a groove for accommodating and supplying power to an external receiving electrode 400; and a water droplet removal device 300, the water droplet removal device 300 being at least partially located in front of the output electrode 200, such that when the external receiving electrode 400 is inserted into the output electrode 200, the external receiving electrode 400 has passed through the water droplet removal device 300.

[0028] The housing 100 provides support, protection and insulation for the internal components. The housing 100 can be made of insulating and waterproof materials.

[0029] The end face 101 is located at Figure 1 The left end of the housing 100 shown, the end face 101, can be used to fix and connect the water droplet removal device 300. (As shown...) Figure 1As shown, since the housing 100 extends in the left-right direction and the output electrode 200 extends from right to left, the end face 101 is located at the left end of the housing 100. However, the position of the end face described in this application is not limited to the left side of the housing 100. For example, depending on the position of the components inside the housing, the end face may also be located at the right end of the housing 100.

[0030] The output electrode 200 is disposed in the housing 100, and the output electrode 200 may be made of metal or alloy. Figure 1 The diagram shows two output electrodes 200 (i.e., first electrode 201 and second electrode 202), which are mounted in parallel inside the charging plug 10 and connected to two water droplet removal devices 300 respectively. Figure 1 As shown, the output electrode 200 is arranged in the left-right direction inside the housing 100 and extends to the left end face 101. The output electrode 200 has a groove inside, which can be used to accommodate the receiving electrode 400, so that the output electrode 200 and the receiving electrode 400 can contact and fix each other, thereby forming a stable current path. Figure 1 The charging plug 10 is shown to be arranged horizontally in the left-right direction. However, it is understood that the charging plug 10 can also be arranged in other directions and correspondingly contact and fix with the receiving electrode 400, as long as the technical concept described in this application can be realized.

[0031] The water droplet removal device 300 has a ring-shaped, hollow structure that can accommodate the external receiving electrode 400. For example... Figure 1 As shown, the water droplet removal device 300 can be fixed between the end face 101 and the output electrode 200, in the same direction as the output electrode 200 (e.g., ...). Figure 1 (As shown in the left-right direction). When the charging plug 10 is connected to the external receiving electrode 400 and charging is in progress, as the external receiving electrode 400 is gradually inserted into the output electrode, the external receiving electrode has passed through the water droplet removal device 300. During this period, the water droplet removal device 300 wraps around the external receiving electrode 400 and removes water droplets, water films, and / or water droplets adhering to the external receiving electrode 400, ensuring that there are no water droplets, water films, or water droplets between the external receiving electrode 400 and the output electrode 200 (i.e., in a "waterless" or "nearly waterless" state), thus avoiding the formation of a micro-electrolytic cell between the external receiving electrode 400 and the output electrode 200. In this application, unless otherwise specified, the terms water droplet, water film, and water droplet are collectively referred to as water droplets.

[0032] Meanwhile, the water droplet removal device 300 forms a sealed cavity with at least a portion of one end of the external receiving electrode 400, preventing external moisture from entering and contacting other parts of the external receiving electrode 400 and the output electrode 200, thus achieving a waterproof effect. When the external receiving electrode 400 is inserted into the charging plug 10, the external receiving electrode 400 first passes through the water droplet removal device 300, and then contacts and is fixed to the output electrode 200. This ensures that the surface of the external receiving electrode 400 is dry and isolated from external moisture while maintaining full contact with the output electrode 200, guaranteeing smooth charging.

[0033] Although Figure 1 The diagram shows that the water droplet removal device 300 is entirely located in front of the output electrode 200 (i.e., Figure 1 (As shown in the diagram, the output electrode 200 is located on the left side). However, the technical principle of this application is not limited to this. The water droplet removal device 300 can be located at least partially in front of the output electrode 200 to remove water droplets or water films adhering to the external receiving electrode 400, thereby achieving the effect of waterproofing. For example, a part of the water droplet removal device 300 is located in front of the output electrode 200, and another part of the water droplet removal device 300 is located in the groove of the output electrode 200. This way, when the external receiving electrode 400 is inserted into the output electrode 200, it will be acted upon by a part of the water droplet removal device 300 located in the groove, thereby further removing water droplets from the surface of the external receiving electrode 400.

[0034] The output electrode 200 includes a first electrode 201 and a second electrode 202, and the water droplet removal device 300 includes two water droplet removal rings corresponding to the first electrode 201 and the second electrode 202, respectively.

[0035] like Figure 1 As shown in the dashed box, the output electrode 200 has two electrodes: a first electrode 201 and a second electrode 202. The first electrode 201 and the second electrode 202 are mounted parallel to each other inside the charging plug 10. The first electrode 201 and the second electrode 202 are arranged in a left-right direction within the housing 100 and extend towards the left end face 101. The first electrode 201 and the second electrode 202 are the positive and negative terminals, respectively, forming a closed loop to transmit electrical energy for charging. It is understood that... Figure 1 The arrangement of the first and second electrodes shown is merely exemplary and is sufficient to achieve the charging function. The charging plug may also include three or more electrodes for charging operations. Those skilled in the art can select the number of output electrodes according to the technical principles of this application, as long as the technical principles of this application are implemented.

[0036] The water droplet removal device 300 includes a water droplet removal ring. The ring is annular in shape, made of waterproof material, and hollow inside to accommodate the external receiving electrode 400. The water droplet removal rings correspond to the first electrode 201 and the second electrode 202, respectively. In other words, one water droplet removal ring can be provided for the first electrode 201 and one for the second electrode 202. As the two receiving electrodes 400 are inserted into the first electrode 201 and the second electrode 202, respectively, the two water droplet removal rings remove water droplets from their respective receiving electrodes 400. As the charging plug 10 gradually connects to the external receiving electrode 400, and the external receiving electrode 400 is gradually inserted into the water droplet removal device 300, the water droplet removal rings can wrap around the external receiving electrode 400 and remove the water droplets adhering to it, thereby achieving the technical effect of the water droplet removal device 300 described above. When the external receiving electrode 400 is inserted into the charging plug 10, the external receiving electrode 400 first passes through the water droplet removal ring in the water droplet removal device 300, and then comes into contact with and is fixed to the first electrode 201 and the second electrode 202. This ensures that the surface of the external receiving electrode 400 is in a "waterless" or "nearly waterless" state when it is in full contact with the first electrode 201 and the second electrode 202, thus isolating it from external moisture and ensuring smooth charging.

[0037] To achieve the structure and energy transfer of the water droplet removal ring described above, the water droplet removal ring can have a predetermined length along its axial direction. For example, the water droplet removal ring along... Figure 1 The device has a predetermined length in the left-right direction. The predetermined length can be set according to parameters such as the material of the water droplet removal ring, the length of the output electrode 200, the length of the external receiving electrode 400, and the size of the charging plug 10, as long as the technical principle of this application can be achieved.

[0038] The outer casing 100 is an insulating casing. The outer casing 100 is made of an insulating material (e.g., plastic). The outer casing 100 can cover the output electrode 200 inside the charging plug 10. The outer casing 100, made of insulating material, can prevent the user from contacting the internal circuitry of the charging plug 10 and prevent the charging plug 10 from coming into contact with external moisture and causing a short circuit when charging underwater, thus ensuring smooth charging.

[0039] The water droplet removal device 300 can be made of a flexible material. Flexible materials, for example, possess high flexibility and adaptability, can withstand significant deformation without breaking, and can deform under external force while returning to their original shape after the force disappears. Furthermore, the flexible material retains its performance after repeated stress. The water droplet removal device 300, made of flexible material, can accommodate the external receiving electrode 400. When the external receiving electrode 400 is inserted into the charging plug 10, it first enters the water droplet removal device 300. The water droplet removal device 300 deforms under external force. As the external receiving electrode 400 passes through the water droplet removal device 300, the water droplets carried on it are expelled by squeezing the device. The water droplet removal device 300 then encloses the external receiving electrode 400, forming a sealed environment that prevents external moisture from entering. The sealing ring, made of flexible material, effectively waterproofs the device, protects the internal electrode, and maintains its performance after multiple uses, demonstrating high durability.

[0040] The water droplet removal device 300 may include a hole that allows the receiving electrode 400 to pass through. The hole in the water droplet removal device 300 may be one end of the annular structure of the water droplet removal ring described above, through which the receiving electrode 400 enters the water droplet removal device 300. When the charging plug 10 is connected to the external receiving electrode 400 and charging is performed, as the external receiving electrode 400 is gradually inserted into the water droplet removal device 300, the hole in the water droplet removal device 300 allows the external receiving electrode 400 to pass through, and the water droplet removal device 300 can remove water droplets adhering to the external receiving electrode 400, thereby achieving the technical effect of the water droplet removal device 300 described above.

[0041] The aperture of the water droplet removal device 300 is adapted to the diameter of the receiving electrode 400, so that water droplets on the receiving electrode 400 are removed from the receiving electrode 400 when the receiving electrode 400 enters the aperture.

[0042] The aperture of the hole in the water droplet removal device 300 can be set according to the diameter of the receiving electrode. When the charging plug 10 needs to be connected to the external receiving electrode 400 for charging, as the external receiving electrode 400 is gradually inserted into the water droplet removal device 300, the water droplets on the external receiving electrode 400 will be carried away from the external receiving electrode 400 by the water droplet removal device 300. The smaller the aperture of the hole in the water droplet removal device 300 is relative to the diameter of the receiving electrode 400, the better the water droplet discharge effect is when the water droplet removal device 300 surrounds the external receiving electrode 400 and moves relative to it. The water droplets on the external receiving electrode 400 are more easily detached from the receiving electrode 400, thereby achieving the technical effect of the water droplet removal device 300 described above.

[0043] It is worth noting that if the aperture of the water droplet removal device 300 is too small relative to the diameter of the receiving electrode 400, it will cause difficulty in inserting the external receiving electrode 400 into the water droplet removal device 300. If the aperture of the water droplet removal device 300 is too large relative to the diameter of the receiving electrode 400, it will not be able to effectively remove water droplets from the external receiving electrode 400 when the external receiving electrode 400 enters the aperture. Therefore, the aperture of the water droplet removal device 300 should be matched with the diameter of the receiving electrode 400 to ensure good water droplet removal effect without causing any obstacles in use.

[0044] When the receiving electrode 400 passes through the water droplet removal device 300, the water droplet removal device 300 can deform, thereby squeezing the water droplets away from the receiving electrode 400. As the external receiving electrode 400 gradually passes through the water droplet removal device 300, the external receiving electrode 400 is squeezed by the water droplet removal device 300, pushing the water droplets attached to the external receiving electrode 400 out.

[0045] The diameter of the water droplet removal ring in the water droplet removal device 300 is smaller than the diameter of the external receiving electrode 400. The water droplet removal ring needs to be subjected to external force to deform the internal cavity of the water droplet removal ring, so that the external receiving electrode 400 can pass through and be accommodated in a certain length direction. At this time, the water droplets adhering to the surface of the external receiving electrode are better discharged by the insertion action of the external receiving electrode 400. The gap between the water droplet removal ring and the external receiving electrode 400 is smaller, and the sealed environment formed has a stronger waterproof effect, avoiding the formation of a micro-electrolysis cell after the electrode surface comes into contact with water.

[0046] The water droplet removal device 300 is integrally formed with the outer shell 100.

[0047] The water droplet removal device 300 is enclosed within the housing 100, and can be integrally molded with the housing 100, reducing the number of parts and assembly steps, minimizing seams and connection points, resulting in a robust overall structure and enhanced durability. When the external receiving electrode 400 is inserted into the charging plug 10 and forms a sealed environment with the water droplet removal device 300, the integrally molded water droplet removal device 300 and housing 100 prevent external moisture from seeping into the charging cavity through the seams, further enhancing the waterproofness of the charging plug 10.

[0048] The water droplet removal device 300 may include a guiding structure that can guide the receiving electrode 400 into the water droplet removal device 300.

[0049] The guiding structure of the water droplet removal device 300 can be made of, for example, a waterproof and insulating sealing ring, which has good sealing performance and wear resistance. When the external receiving electrode 400 first contacts the water droplet removal device 300, the guiding structure (e.g., the sealing ring) first contacts the external receiving electrode 400, and the sealing ring can align the orientation of the external receiving electrode 400 with the extension direction of the internal structure of the water droplet removal device 300 (e.g., the water droplet removal ring in the water droplet removal device 300), thereby facilitating the smooth entry of the external receiving electrode 400 into the internal structure of the water droplet removal device 300. The guiding structure can be disposed on the outside of the water droplet removal device 300; in other words, the guiding structure can be disposed between the water droplet removal device 300 and the end face 101. The entrance of the guide structure can be set at a certain angle of cone so that the external receiving electrode 400 can further squeeze the guide structure (e.g., sealing ring) when it enters the guide structure, thereby enhancing the waterproof performance of the water droplet removal device. The external receiving electrode 400 can also be guided to enter the water droplet removal device 300 in the correct direction by the certain angle of cone at the entrance of the guide structure.

[0050] The water droplet remover 300 includes a water-absorbing material. When the external receiving electrode 400 enters the water droplet remover 300, at least a portion of the water droplets on the external receiving electrode 400 are absorbed by the water-absorbing material.

[0051] The absorbent material can adsorb water droplets carried on the external receiving electrode 400, preventing some water droplets from entering the groove of the output electrode even if they are not discharged by the water droplet removal device 300. Before the external receiving electrode 400 fully contacts the output electrode 200, it is squeezed by the water droplet removal device 300, pushing out the water droplets attached to it. At this time, the water droplets that are not successfully discharged will be absorbed by the absorbent material, further enhancing the waterproof effect of the water droplet removal device.

[0052] This application also provides a charging component for a pool cleaning device 20, please refer to... Figure 2A The charging component includes an external receiving electrode 400 and a charging plug 10 as described in any of the above embodiments, wherein the external receiving electrode 400 is disposed at the charging port of the pool cleaning device 20.

[0053] like Figure 2A As shown, the two external receiving electrodes 400 correspond to the first electrode 201 and the second electrode 202 in the output electrode 200, respectively, and the external receiving electrodes 400 can be made of metal or alloy. The output electrode 200 can also be made of metal or alloy. It is understood that the external receiving electrodes 400 can also be arranged in other directions and correspondingly contact and be fixed to the output electrode 200, as long as the technical concept described in this application is realized.

[0054] The pool cleaning equipment 20 can be, for example, an automatic pool cleaning robot or an automatic pool sweeping robot.

[0055] Figure 2B The demonstration shows the robot in charging mode, with the external receiving electrode 400 inserted into the charging plug 10 via the water droplet removal device 300 and in contact with the output electrode 200. As the external receiving electrode 400 is gradually inserted into the water droplet removal device 300, the water droplet removal ring surrounds the external receiving electrode 400, and the water droplets on the external receiving electrode 400 are discharged by the water droplet removal ring. This ensures that the external receiving electrode 400 is in a "waterless" or "nearly waterless" state when it reaches the output electrode 200 and combines with it. This guarantees that there is no water film in the charging chamber, avoiding the formation of a micro-electrolysis cell. Furthermore, the two sealing rings and the external receiving electrode 400 form a sealed environment, preventing external moisture from entering and ensuring smooth charging.

[0056] The external receiving electrode 400 is columnar or sheet-shaped and protrudes from the end face of the charging port.

[0057] The receiving electrode 400 can be made of metal or alloy. The receiving electrode 400 is columnar or sheet-shaped and protrudes from the end face of the charging port, and is arranged in the direction corresponding to the output electrode 200. It can be smoothly inserted into the water droplet removal device 300 (e.g., the hole of the water droplet removal device 300), so that the external receiving electrode 400 is squeezed by the water droplet removal device 300, thereby expelling the water droplets on the surface of the external receiving electrode 400. The external receiving electrode 400 is in a dry state and combines with the groove of the output electrode 200 to form a stable current path.

[0058] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0061] In this application, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0062] The above description is merely an exemplary embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope described in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging plug (10) for an underwater device, comprising: a housing (100) comprising an end face (101); an output electrode (200) located inside the housing (100) and extending from inside the housing (100) to the end face (101), the output electrode (200) comprising a groove for accommodating and powering an external receiving electrode (400); a water bead removing device (300) located at least partially in front of the output electrode (200) such that the external receiving electrode (400) has passed through the water bead removing device when the external receiving electrode (400) is inserted into the output electrode (200).

2. The charging plug (10) according to claim 1, wherein the output electrode (200) comprises a first electrode (201) and a second electrode (202), and the water bead removing device (300) comprises two water bead removing rings corresponding to the first and second electrodes respectively.

3. The charging plug (10) of claim 1, wherein, the housing (100) is an insulating housing.

4. The charging plug (10) according to claim 3, wherein the water bead removing device (300) is made of a flexible material.

5. The charging plug (10) according to claim 1 or 4, wherein the water bead removing device (300) comprises a hole allowing the external receiving electrode (400) to pass through.

6. The charging plug (10) according to claim 5, wherein the water bead removing device (300) is capable of deforming when the external receiving electrode (400) passes through the water bead removing device (300) so as to squeeze water beads off the external receiving electrode (400).

7. The charging plug (10) of claim 1, wherein, the water bead removing device (300) is integrally formed with the housing (100).

8. The charging plug (10) of claim 1, wherein, the water bead removing device (300) comprises a guiding structure capable of guiding the external receiving electrode (400) into the water bead removing device (300).

9. The charging plug (10) of claim 1, wherein, the water bead removing device (300) comprises a water absorbing material capable of absorbing water beads on at least a portion of the external receiving electrode (400) when the external receiving electrode (400) enters the water bead removing device (300).

10. The charging plug (10) of claim 5, wherein, the hole of the water bead removing device (300) has a diameter matching the diameter of the external receiving electrode (400) so as to allow water beads on the external receiving electrode (400) to be squeezed off the external receiving electrode (400) when the external receiving electrode (400) enters the hole.

11. A charging assembly for a pool cleaning device, comprising an external receiving electrode (400) and a charging plug (10) as claimed in any one of claims 1-10, the external receiving electrode (400) being arranged at a charging port of the pool cleaning device (20).

12. The charging assembly of claim 11, wherein, the external receiving electrode (400) is in the shape of a column or a sheet and protrudes relative to the end face of the charging port.

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