Underwater wireless charging coil assembly, docking method and underwater wireless charging device

Abstract

In order to solve the technical problems that the existing underwater wireless charging devices have low power transmission efficiency due to the difficulty in avoiding eddy current loss in the coil coupling area caused by seawater, and the influence of the misalignment of the primary and secondary coils on the coil parameters is not considered, which is not conducive to the efficient and stable operation of the underwater wireless charging device, the present invention proposes an underwater wireless charging coil assembly, a docking method and an underwater wireless charging device. The present invention adds a deformable medium storage bag and an insulating medium charging and discharging device for filling and extracting insulating medium from the deformable medium storage bag to the primary coil assembly located on the side of the underwater charging base station, so that the coil assembly has the function of discharging seawater in the coil coupling area and automatic centering after docking, thereby improving the power transmission efficiency and stability.

Description

Technical Field

[0001] The invention relates to the technical field of power supply circuit devices or systems. Background Art

[0002] The underwater wireless charging device can realize the underwater wireless power supply of underwater equipment such as unmanned submersibles and buoys, effectively improving the endurance and concealment of underwater equipment such as unmanned submersibles and buoys. Figure 1-2 As shown, taking the underwater wireless charging device for underwater wireless power supply of a rotating unmanned submersible 3 as an example, the annular primary coil 4 of the underwater wireless charging device is installed on the underwater charging base station 1 through the threaded hole of the primary coil shell, the annular secondary coil 5 is installed on the unmanned submersible 3, the base station control cabin 2 is arranged on the side of the underwater charging base station 1, the primary circuit 15 is arranged in the base station control cabin 2 and is electrically connected to the annular primary coil 4 by wire; when the unmanned submersible 3 enters the underwater charging base station 1 and the annular primary coil 4 and the annular secondary coil 5 are basically connected After alignment, the electric energy supplied by the underwater charging base station 1 is first reversed into high-frequency alternating current through the high-frequency inverter circuit in the primary circuit 15 and input into the annular primary coil 4. The annular primary coil 4 generates an alternating magnetic field under the action of the high-frequency alternating current. The alternating magnetic field is linked with the annular secondary coil 5 to excite the induced electromotive force, and is converted into direct current through the rectifier in the secondary circuit 16. The direct current is converted into the voltage required for charging the battery pack of the submersible through the battery charger, and the electric energy output by the underwater charging base station 1 can be supplied to the unmanned submersible 3 through the underwater wireless charging device.

[0003] After the unmanned submersible 3 is docked with the underwater charging base station 1, there will inevitably be a gap between the annular primary shell and the annular secondary shell, causing seawater to enter; since seawater is conductive, during the wireless charging process, seawater will cause eddy current losses in the coil coupling area, resulting in a decrease in the power transmission efficiency of the underwater wireless charging device.

[0004] In order to reduce eddy current losses and improve the efficiency of power transmission, the existing methods are to control the current on the coil or optimize the topology of the coil. However, these methods cannot fundamentally reduce or eliminate the eddy current losses in the coil coupling area, and the effect of improving the power transmission efficiency is not obvious.

[0005] In addition, the existing annular coil structure used in underwater wireless charging devices (such as the annular segmented coil structure disclosed in publication number CN115071462A) does not consider the impact of the misalignment of the annular primary coil and the annular secondary coil on the coil parameters, which is not conducive to the efficient and stable operation of the underwater wireless charging device. Summary of the invention

[0006] In order to solve the technical problems that the existing underwater wireless charging devices have low power transmission efficiency due to the difficulty in avoiding eddy current loss in the coil coupling zone caused by seawater, and fail to consider the influence of misalignment of the primary and secondary coils on coil parameters, which is not conducive to the efficient and stable operation of the underwater wireless charging devices, the present invention proposes an underwater wireless charging coil assembly, a docking method and an underwater wireless charging device.

[0007] The technical solution of the present invention is:

[0008] The underwater wireless charging primary coil assembly is special in that it includes an annular primary shell, an annular primary coil, an annular array of primary ferrite cores, a deformable dielectric storage capsule, and an insulating dielectric charging and discharging device;

[0009] The primary ferrite core annular array and the annular primary coil are both arranged in the annular primary shell, and the primary ferrite core annular array is located outside the annular primary coil;

[0010] In the radial direction, the annular primary shell has a small-diameter inner wall and a large-diameter inner wall; the deformable medium storage bag is an annular structure adapted to the small-diameter inner wall and is arranged on the small-diameter inner wall; the inner ring outer surface of the deformable medium storage bag serves as a surface of the entire primary coil assembly for matching with the secondary coil assembly;

[0011] The insulating medium charging and discharging device is arranged outside the annular primary shell, and is used to fill the insulating medium into the deformable medium storage bag to make it gradually expand and continuously squeeze the secondary coil assembly to provide it with circumferential force to achieve the centering of the primary and secondary coil assemblies, and at the same time discharge the seawater in the coil coupling area, and to extract the insulating medium in the deformable medium storage bag and reflow storage after the charging is completed to restore its deformation.

[0012] Furthermore, the insulating medium charging and discharging device is an oil charging and discharging device, the insulating medium is thermally conductive insulating oil, and the deformable medium storage bag is an oil bag.

[0013] Furthermore, the oil filling and discharging device includes an oil storage tank cover, an oil storage tank body, a pump, a first inner conduit, a flow valve, a second inner conduit, a solenoid valve and an outer conduit connected in sequence, and a control module for controlling the pump, the flow valve and the solenoid valve; the oil storage tank body is arranged outside the annular primary side shell, the oil storage tank cover is arranged at the upper end of the oil storage tank body and is statically sealed by a sealing ring to form a sealed oil storage tank, and the oil storage tank stores heat-conducting insulating oil; the pump, the first inner conduit, the flow valve, the solenoid valve and the second inner conduit are located in the oil storage tank body, the outer conduit is located outside the oil storage tank body and is connected to the oil bag, and the control module is integrated in the base station control cabin.

[0014] Furthermore, the small-diameter inner wall of the annular primary shell is an open structure, a rubber cover is provided on the small-diameter inner wall to form the oil bag, and the oil bag is pre-filled with heat-conducting insulating oil with an oil pressure equal to the external seawater pressure;

[0015] Alternatively, the small-diameter inner wall of the annular primary side housing is a closed structure, and a rubber oil bag is provided on the small-diameter inner wall.

[0016] Furthermore, the insulating medium charging and discharging device may also be a gas charging and discharging device, the insulating medium is insulating gas, and the deformable medium storage bag is an air bag.

[0017] Furthermore, the inflation and deflation device includes an air storage chamber cover, an air storage chamber body, an air pump, a third inner conduit, a second flow valve, a fourth inner conduit, a second solenoid valve, and a second outer conduit connected in sequence, and a second control module for controlling the air pump, the second flow valve, and the second solenoid valve; the air storage chamber body is arranged outside the annular primary side shell, the air storage chamber cover is arranged at the upper end of the air storage chamber body and is statically sealed by a sealing ring to form a sealed gas storage chamber, and insulating gas is stored in the gas storage chamber; the air pump, the third inner conduit, the second flow valve, the second solenoid valve and the fourth inner conduit are located inside the air storage chamber body, the second outer conduit is located outside the air storage chamber body and is connected to the airbag, and the second control module is integrated in the base station control cabin.

[0018] Furthermore, the small-diameter inner wall of the annular primary shell is an open structure, a rubber cover is provided on the small-diameter inner wall to form the airbag, and the airbag is pre-filled with insulating gas with a pressure equal to the external seawater pressure;

[0019] Alternatively, the small-diameter inner wall of the annular primary side housing is a closed structure, and a rubber airbag is provided on the small-diameter inner wall.

[0020] The present invention also provides an underwater wireless charging coil assembly, including a secondary coil assembly; the special feature of the underwater wireless charging coil assembly is that it also includes the above-mentioned primary coil assembly.

[0021] The present invention also provides an underwater wireless charging device, which is special in that it includes the underwater wireless charging coil assembly mentioned above.

[0022] The present invention also provides a docking method based on the above-mentioned underwater wireless charging coil assembly, the special feature of which is that the docking method is:

[0023] When the underwater equipment equipped with the secondary coil assembly is docked with the underwater charging base station, the insulating medium charging and discharging device in the primary coil assembly is used to fill the insulating medium into the deformable medium storage bag on the inner wall of the small diameter of the annular primary shell to gradually expand it, so that the coil is gradually centered and the seawater in the coil coupling area is discharged;

[0024] During the process of filling the insulating medium into the deformable medium reservoir, the fitting state of the deformable medium reservoir and the secondary coil assembly is detected by real-time image acquisition and recognition technology, or by real-time detection of the voltage pulse peak generated by the secondary coil assembly. When it is detected that the deformable medium reservoir and the secondary coil assembly are completely fitted together, the insulating medium charging and discharging device stops working, and the docking of the underwater wireless charging coil assembly is completed.

[0025] The beneficial effects of the present invention are:

[0026] 1. The coil assembly of the present invention has the function of discharging seawater from the coil coupling area and the function of automatic centering of the primary and secondary coils when docking. After the seawater is discharged, there is almost no eddy current loss in the coil coupling area, so the power transmission efficiency is high and the power transmission is stable.

[0027] 2. When the impact of ocean current causes underwater equipment such as unmanned submersibles to shake, the deformable medium storage bag in the present invention can play a buffering role to protect the underwater equipment and the underwater charging base station.

[0028] 3. The present invention only needs to modify the primary coil assembly installed on the side of the underwater charging base station to greatly reduce or even eliminate the eddy current loss in the coil coupling zone and realize automatic centering of the primary and secondary coils. No modification is required on the underwater equipment end such as unmanned submersibles, and the weight and size of underwater equipment such as unmanned submersibles will not be increased, and the strict requirements on the weight and size of the technical indicators of long flight time and long range of underwater equipment can be met. At the same time, since the underwater charging base station is used in a fixed scene, the weight and size requirements are not strict, so the insulating medium charging and discharging device and the deformable medium storage bag added to discharge seawater do not affect the normal operation and performance of the underwater charging base station.

[0029] 4. The present invention can design the annular primary shell and the deformable dielectric storage capsule to be relatively independent. In this case, only the deformable dielectric storage capsule and the insulating dielectric charging and discharging device can be added to the existing underwater wireless charging device, and the circuit parameters can be adjusted to match the coil assembly, without the need to redesign the annular primary shell, coil structure and circuit topology of the original underwater wireless charging device, thereby reducing the cost of improvement and implementation. At the same time, since the deformable dielectric storage capsule and the annular primary shell are relatively independent in design, when the deformable dielectric storage capsule is damaged, it will only affect the working efficiency of the annular primary coil but will not affect its normal operation. Therefore, the relatively independent design has higher reliability.

[0030] 5. When the insulating medium charging and discharging device in the present invention is an oil charging and discharging device and the deformable medium storage bag is an oil bag, the coil assembly and the wireless charging device of the present invention can be used in a deep water environment. On the one hand, the oil charging and discharging device can fill the oil bag with thermally conductive insulating oil to discharge the seawater in the coil coupling area to reduce eddy current losses. On the other hand, the heat generated by the annular primary coil can be discharged to the external seawater through the thermally conductive insulating oil, thereby improving the working reliability of the annular primary coil.

[0031] 6. The primary coil assembly, wireless charging coil assembly and underwater wireless charging device of the present invention can be sold individually or as a set to meet the needs of different usage scenarios.

[0032] 7. The primary coil assembly and underwater wireless charging coil assembly of the present invention are annular coil assemblies, which are suitable for rotating underwater equipment and non-rotating underwater equipment with a cylindrical docking recovery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the docking state when an unmanned submersible is charged underwater using an existing underwater wireless charging device.

[0034] Figure 2 This is a working principle diagram of the underwater wireless charging device.

[0035] Figure 3 It is a schematic structural diagram of Example 1 of the present invention (annular primary housing-oil sac integrated design).

[0036] Figure 4 It is a schematic diagram of the oil bag after being filled with oil in Embodiment 1 of the present invention.

[0037] Figure 5 It is a schematic diagram of the positional relationship between the primary ferrite core annular array and the annular primary coil in Example 1 of the present invention.

[0038] Figure 6 It is a schematic diagram of the positional relationship between the secondary ferrite core annular array and the annular secondary coil in Example 1 of the present invention.

[0039] Figure 7 It is a schematic diagram of the structure of Example 2 of the present invention (relatively independent design of annular primary housing-oil bag).

[0040] Figure 8 It is a schematic diagram of the oil bag after being filled with oil in Embodiment 2 of the present invention.

[0041] Fig. 9 It is a schematic diagram of the docking state of an unmanned submersible when charging underwater using the present invention.

[0042] Fig.10 This is a cloud diagram of eddy current loss before the oil bag is filled with oil in Example 2 of the present invention.

[0043] Fig.11 This is a cloud diagram of eddy current loss after the oil bag is fully filled with oil in Example 2 of the present invention.

[0044] Description of reference numerals:

[0045] 1- underwater charging base station; 2- base station control cabin; 3- unmanned underwater vehicle; 4- annular primary coil; 5- annular secondary coil; 6- insulating medium charging and discharging device; 601- oil storage tank cover; 602- oil storage tank body; 603- pump; 604- oil inlet and outlet; 605- first inner conduit; 606- flow valve; 607- second inner conduit; 608- solenoid valve; 609- outer conduit; 610- thermal insulating oil; 7- annular primary shell; 8- primary ferrite core annular array; 9- deformable medium storage capsule; 10- secondary inner shell; 11- rubber cover; 12- secondary ferrite core annular array; 13- secondary baffle cover; 14- secondary shell; 15- primary circuit; 16- secondary circuit. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0047] Reference Figure 3-9 The underwater wireless charging coil assembly provided by the present invention includes a primary coil assembly and a secondary coil assembly.

[0048] The primary coil assembly and the secondary coil assembly are both annular structures as a whole. After docking, the secondary coil assembly is located in the center hole of the primary coil assembly.

[0049] The primary coil assembly includes an annular primary shell 7, an annular primary coil 4, a primary ferrite core annular array 8, a deformable dielectric storage capsule 9 and an insulating medium charging and discharging device 6. The annular primary coil 4 is arranged inside the primary ferrite core annular array 8, and both are arranged inside the annular primary shell 7. In the radial direction, the annular primary shell 7 has a small diameter inner wall and a large diameter inner wall; the deformable dielectric storage capsule 9 is an annular structure adapted to the small diameter inner wall of the annular primary shell 7, and is arranged on the small diameter inner wall of the annular primary shell 7; the inner ring outer surface of the deformable dielectric storage capsule 9 serves as the surface of the entire primary coil assembly for matching with the secondary coil assembly; the deformable dielectric storage capsule 9 can share the cavity of the annular primary shell 7 with the annular primary coil 4 and the primary ferrite core annular array 8, or can be arranged outside the cavity of the annular primary shell 7 and relatively independent therefrom. The insulating medium charging and discharging device 6 is arranged outside the annular primary shell 7, and is used to fill the insulating medium into the deformable medium storage bag 9 to make it gradually expand, so as to discharge the seawater in the coil coupling area after the secondary coil assembly is docked with the primary coil assembly, and to extract the insulating medium in the deformable medium storage bag and reflow it for storage after charging is completed to restore its deformation.

[0050] The secondary coil assembly includes an annular secondary shell, an annular secondary coil 5 and a secondary ferrite core annular array 12; the secondary ferrite core annular array 12 is arranged on the inner side of the annular secondary coil 5, and both are arranged in the annular secondary shell.

[0051] The working principle of the present invention is:

[0052] Reference Figure 3-9 When the underwater equipment (such as the unmanned submersible 3) is docked with the underwater charging base station 1, the secondary coil assembly is located in the central hole of the primary coil assembly. At this time, the insulating medium is filled into the deformable medium storage capsule 9 by the insulating medium charging and discharging device 6. As the pressure inside the deformable medium storage capsule 9 gradually increases to be greater than the external water pressure, it begins to expand outward. The deformable medium storage capsule 9 continuously squeezes the secondary coil assembly and provides a circumferential force to it. Under the action of the circumferential force, the annular primary coil 4 and the annular secondary coil 5 are gradually aligned, and the deformable medium storage capsule 9 gradually expands and gradually fits with the secondary coil assembly, so that the seawater between the two is gradually discharged. When the deformable medium storage capsule 9 is completely fitted with the secondary coil assembly, the annular primary coil 4 and the annular secondary coil 5 are completely aligned, which improves the stability of power transmission; at the same time, since the seawater in the coil coupling area is basically emptied, the eddy current loss generated by the seawater in the coil coupling area is reduced to a minimum or even eliminated, which improves the power transmission efficiency.

[0053] Embodiment 1:

[0054] like Figure 3 As shown, this embodiment provides an underwater wireless charging coil assembly, including a primary coil assembly and a secondary coil assembly.

[0055] The primary coil assembly includes an annular primary shell 7, an annular primary coil 4, a primary ferrite core annular array 8, a deformable medium storage capsule 9 and an insulating medium charging and discharging device 6.

[0056] The deformable medium storage capsule 9 is an oil capsule, the insulating medium filling and discharging device 6 is an oil filling and discharging device, and the insulating medium filled into the oil capsule is heat-conducting insulating oil, such as transformer oil.

[0057] In this embodiment, an integrated design is adopted in which the oil bag and the annular primary coil share the cavity of the annular primary shell. Specifically, Figure 3As shown, the small-diameter inner wall of the annular primary housing 7 is an open structure, and a rubber cover 11 (such as a silicone cover or a thermoplastic elastomer cover) is provided on the small-diameter inner wall to form an annular oil bag. In the initial state, preferably, thermally conductive insulating oil 610 can be pre-placed in the oil bag, and the internal oil pressure is balanced with the external seawater pressure (on the one hand, it can prevent the seawater pressure from flattening the oil bag and affecting the installation space of the annular primary coil, and on the other hand, it can shorten the time for discharging the seawater in the coupling area and improve the docking efficiency), and the oil bag is separated from the outer wall of the secondary coil assembly; after the thermally conductive insulating oil is filled into the oil bag through the oil filling and discharging device, the oil bag will gradually expand and gradually fit with the outer wall of the secondary coil assembly.

[0058] The oil filling and discharging device includes an oil storage tank cover 601, an oil storage tank body 602, a pump 603, a first inner conduit 605, a flow valve 606, a second inner conduit 607, a solenoid valve 608 and an outer conduit 609 connected in sequence, and a control module (existing unit, not shown in the figure) for controlling the pump 603, the flow valve 606 and the solenoid valve 608. The oil storage tank cover 601 is arranged at the upper end of the oil storage tank body 602 and is statically sealed by a sealing ring to form a sealed oil storage tank, in which heat-conducting insulating oil is stored; the pump 603, the first inner conduit 605, the flow valve 606, the solenoid valve 608 and the second inner conduit 607 are located in the oil storage tank body 602, the outer conduit 609 is located outside the oil storage tank body 602 and is connected to the oil bag, the oil inlet and outlet 604 is located below the housing of the pump 603, and the control module is integrated in the base station control cabin on the side of the underwater charging base station.

[0059] The control principle of the oil filling and discharging device is:

[0060] The control module switches between filling and draining oil modes by controlling the forward and reverse modes of the pump 603 , opens and closes the oil circuit by controlling the solenoid valve 608 , and adjusts the rate of filling and draining the oil bag by controlling the flow valve 606 .

[0061] When filling with oil, the voltage pulse generated by the annular primary coil 4 is kept unchanged, and the control module monitors the voltage pulse peak value generated by the annular secondary coil 5 in real time. As the oil bag gradually expands, the seawater in the coil coupling area is gradually discharged. During this process, the eddy current loss in the coil coupling area gradually decreases, so the voltage pulse peak value generated by the annular secondary coil 5 gradually increases. When the control module detects that the voltage pulse peak value generated by the annular secondary coil 5 no longer changes, the eddy current loss has been reduced to the minimum, indicating that the oil bag and the secondary coil assembly are completely fitted and no further oil filling is required. At this time, the control module controls the solenoid valve 608 to close the oil circuit, and calculates the current oil filling amount through the flow rate of the flow valve 606 and the oil filling time.

[0062] When draining the oil, the control module calculates the drain flow rate in real time according to the flow rate of the flow valve 606 and the drain time. When the drain flow rate is equal to the oil filling amount, it indicates that the oil bag has returned to its initial state. At this time, the control module controls the solenoid valve 608 to close the oil circuit.

[0063] The secondary housing assembly includes an annular secondary housing, an annular secondary coil 5 and an annular secondary ferrite core array 12. The annular secondary housing is composed of an inner secondary housing 10, an outer secondary housing 14 and an annular secondary cover 13; the inner secondary housing 10 and the outer secondary housing 14 are statically sealed by a sealing ring, and the secondary cover 13 is statically sealed with the inner secondary housing 10 and the outer secondary housing 14 by a sealing ring. The annular secondary coil 5 and the annular secondary ferrite core array 12 are arranged between the inner secondary housing 10 and the outer secondary housing 14.

[0064] Reference Figure 3-4 9. Taking the rotating unmanned underwater vehicle 3 as an example, the working principle of this embodiment is:

[0065] When the unmanned submersible 3 is docked with the underwater charging base station 1, the control module in the present invention turns on the pump 603 and the solenoid valve 608, and the thermally conductive insulating oil enters the pump 603 from the oil storage tank body 602 through the oil inlet and outlet 604, and then enters the oil bag through the first inner conduit 605, the flow valve 606, the second inner conduit 607, the solenoid valve 608 and the outer conduit 609 in sequence. During the oil filling process, the pressure inside the oil bag gradually increases. When the internal pressure of the oil bag is greater than the external water pressure, the rubber cover 11 begins to expand outward. Under the action of the circumferential force of the rubber cover 11 on the secondary outer shell 14, the annular primary coil 4 and the annular secondary coil 5 are gradually aligned, and the seawater between the two is gradually reduced, so that the underwater wireless charging device gradually reaches the optimal working state. When the peak value of the voltage pulse generated by the annular secondary coil 5 no longer changes, it indicates that the rubber cover 11 is completely in contact with the secondary outer shell 14 (such as Figure 4 As shown), at this time, the control module turns off the pump 603 and the solenoid valve 608 to end the oil filling, thereby achieving efficient and stable wireless charging.

[0066] When charging is completed, the control module turns on the pump 603 and the solenoid valve 608 to drain the oil from the oil bag. The thermal insulating oil 610 in the oil bag flows back and is stored in the oil storage tank 602 after passing through the outer conduit 609, the solenoid valve 608, the second inner conduit 607, the flow valve 606, the first inner conduit 605 and the pump 603. The oil bag gradually recovers its deformation, and the rubber cover 11 gradually separates from the secondary side shell 14.

[0067] During this period, adjusting the flow valve 606 can control the speed of oil filling and oil discharge. The oil filling speed needs to be slower to ensure that the unmanned underwater vehicle 3 will not shake due to excessively fast oil filling speed, while the oil discharge speed being too fast or too slow has no effect.

[0068] Embodiment 2:

[0069] like Figure 7 As shown, this embodiment provides an underwater wireless charging coil assembly, the principle of which is the same as that of embodiment 1 and the structure is similar, the only difference is that this embodiment adopts an independent oil bag design, specifically as shown in Figure 7 As shown, the small-diameter inner wall of the annular primary shell 7 is closed, and a relatively independent oil sac is arranged on the small-diameter inner wall of the annular primary shell 7 (that is, the oil sac is located outside the cavity of the annular primary shell 7, and does not share the cavity with the annular primary coil 4). Since an independent oil sac is adopted in this embodiment, whether the oil sac is pre-filled with thermal conductive insulating oil in the initial state does not affect the installation space of the annular primary coil 4, but only affects the oil filling time required to discharge the seawater in the coupling area. Therefore, in this embodiment, the oil sac may be pre-filled with thermal conductive insulating oil to balance the external seawater pressure, or may not be pre-filled with thermal conductive insulating oil. After the oil sac is filled with oil in this embodiment, the schematic diagram of the oil sac and the secondary shell being fully fitted is shown as follows. Figure 8 shown.

[0070] Compared with the integrated oil bag solution in Example 1, this embodiment does not require redesign of the original annular primary shell of the underwater wireless charging device, and has lower improvement costs and higher reliability.

[0071] Effect verification:

[0072] Figure 10-11 is the eddy current loss cloud diagram before and after the oil bag is filled with oil in this embodiment. Fig.10 It can be seen that the eddy current loss before oil filling is mainly concentrated in the seawater area between the primary coil assembly and the secondary coil assembly (coupling area). Fig.11 It can be seen that after oil filling, the eddy current loss between the primary coil assembly and the secondary coil assembly (coupling area) is eliminated.

[0073] Embodiment 3:

[0074] This embodiment provides an underwater wireless charging coil assembly, which has the same principle and similar structure as that of Embodiment 1, except that the control module in the oil filling and discharging device in this embodiment needs to control the oil filling and discharging amount with the help of the image of the oil sac and the secondary housing captured by the camera set on the underwater charging base station. Specifically, when filling the oil, the control module recognizes from the image captured by the camera that the oil sac and the secondary housing are completely fitted together, and the control module controls the solenoid valve to operate to close the oil circuit and stop filling the oil; when discharging the oil, the control module recognizes from the image captured by the camera that the oil sac has basically returned to its original state, and the control module controls the solenoid valve to operate to close the oil circuit and stop discharging the oil.

[0075] Embodiment 4:

[0076] The present embodiment provides an underwater wireless charging coil assembly for use in a shallow water environment, which has the same principle and similar structure as those of Embodiment 1 and Embodiment 2, with the only difference being that the present embodiment replaces the oil bag in Embodiment 1 and Embodiment 2 with an air bag, and correspondingly replaces the oil charging and discharging device with an air charging and discharging device, the structural principle of which is similar to that of the oil charging and discharging device, and can fill the air bag with insulating gas through an air pump, and extract, reflux and store the insulating gas in the air bag through the air pump, control the opening and closing of the air path through an electromagnetic valve, and control the charging and discharging speed through a flow regulating valve.

[0077] Embodiment 5:

[0078] This embodiment provides an underwater wireless charging primary coil assembly, and the structure of the primary coil assembly is the same as the primary coil assembly in Embodiment 1, 2, 3 or 4.

[0079] Embodiment 6:

[0080] This embodiment provides an underwater wireless charging device, which can be used in shallow water environment, and is more suitable for deep water environment; the difference between the underwater wireless charging device and the existing conventional underwater wireless charging device is that: the underwater wireless charging coil assembly provided by embodiment 1 or embodiment 2 of the present invention is adopted; or an oil bag is added to the outer wall of the inner ring of the annular primary shell in the existing underwater wireless charging device, and at the same time, an oil filling and discharging device for filling and discharging oil into the oil bag is added outside the annular primary shell. At this time, the parameters of the primary circuit and the secondary circuit should be matched and adjusted according to the improved coil assembly, and the specific adjustment is an existing mature technology.

[0081] Embodiment 7:

[0082] This embodiment provides an underwater wireless charging device for use in a shallow water environment. The underwater wireless charging device is different from the conventional underwater wireless charging device disclosed in the prior art only in that: the coil assembly provided in Embodiment 4 of the present invention is used; or an air bag is added to the outer wall of the inner ring of the annular primary shell in the existing underwater wireless charging device, and at the same time, a charging and discharging device for inflating and deflation of the air bag is added outside the annular primary shell. At this time, the parameters of the primary circuit and the secondary circuit should be matched and adjusted according to the improved coil assembly, and the specific adjustment is an existing mature technology.

[0083] Embodiment 8:

[0084] This embodiment provides a docking method for an underwater wireless charging coil assembly based on Embodiment 1, 2, 3, or 4, and the method is specifically as follows:

[0085] When the underwater equipment equipped with the secondary coil assembly is docked with the underwater charging base station, the insulating medium (thermal insulating oil / insulating gas) is filled into the deformable medium storage bag (oil bag / air bag) on ​​the outer side wall of the inner ring of the annular primary shell through the insulating medium charging and discharging device in the primary coil assembly to gradually expand it, so that the coil is gradually centered and the seawater in the coil coupling area is discharged;

[0086] During the process of filling the insulating medium into the deformable medium reservoir, the fitting state of the deformable medium reservoir and the secondary coil assembly is detected by real-time image acquisition and recognition technology, or by real-time detection of the voltage pulse peak generated by the secondary coil assembly. When it is detected that the deformable medium reservoir and the secondary coil assembly are completely fitted together, the insulating medium charging and discharging device stops working, and the docking of the underwater wireless charging coil assembly is completed.

Claims

1. Underwater wireless charging primary coil assembly, characterized by: It includes an annular primary shell, an annular primary coil, an annular array of primary ferrite cores, a deformable medium storage capsule and an insulating medium charging and discharging device; The primary ferrite core annular array and the annular primary coil are both arranged in the annular primary shell, and the primary ferrite core annular array is located outside the annular primary coil; In the radial direction, the annular primary shell has a small-diameter inner wall and a large-diameter inner wall; the deformable medium storage bag is an annular structure adapted to the small-diameter inner wall and is arranged on the small-diameter inner wall; the inner ring outer surface of the deformable medium storage bag serves as a surface of the entire primary coil assembly for matching with the secondary coil assembly; The insulating medium charging and discharging device is arranged outside the annular primary shell, and is used to fill the insulating medium into the deformable medium storage bag to make it gradually expand and continuously squeeze the secondary coil assembly to provide it with circumferential force to achieve the centering of the primary and secondary coil assemblies, and at the same time discharge the seawater in the coil coupling area, and to extract the insulating medium in the deformable medium storage bag and reflow storage after the charging is completed to restore its deformation.

2. The underwater wireless charging primary coil assembly according to claim 1, characterized in that: The insulating medium charging and discharging device is an oil charging and discharging device, the insulating medium is heat-conducting insulating oil, and the deformable medium storage bag is an oil bag.

3. The underwater wireless charging primary coil assembly according to claim 2, characterized in that: The oil filling and discharging device includes an oil storage tank cover, an oil storage tank body, a pump, a first inner conduit, a flow valve, a second inner conduit, a solenoid valve and an outer conduit connected in sequence, and a control module for controlling the pump, the flow valve and the solenoid valve; the oil storage tank body is arranged outside the annular primary side shell, the oil storage tank cover is arranged at the upper end of the oil storage tank body and is statically sealed by a sealing ring to form a sealed oil storage tank, and the oil storage tank stores heat-conducting insulating oil; the pump, the first inner conduit, the flow valve, the solenoid valve and the second inner conduit are located inside the oil storage tank body, the outer conduit is located outside the oil storage tank body and is connected to the oil bag, and the control module is integrated in the base station control cabin.

4. The underwater wireless charging primary coil assembly according to claim 2 or 3, characterized in that: The small-diameter inner wall of the annular primary shell is an open structure, and a rubber cover is provided on the small-diameter inner wall to form the oil bag, and the oil bag is pre-filled with heat-conducting insulating oil with an oil pressure equal to the external seawater pressure; Alternatively, the small-diameter inner wall of the annular primary side housing is a closed structure, and a rubber oil bag is provided on the small-diameter inner wall.

5. The underwater wireless charging primary coil assembly according to claim 1, characterized in that: The insulating medium charging and discharging device is a gas charging and discharging device, the insulating medium is insulating gas, and the deformable medium storage bag is an air bag.

6. The underwater wireless charging primary coil assembly according to claim 5, characterized in that: The gas charging and discharging device includes a gas storage chamber cover, a gas storage chamber body, an air pump, a third inner conduit, a second flow valve, a fourth inner conduit, a second solenoid valve, and a second outer conduit connected in sequence, and a second control module for controlling the air pump, the second flow valve, and the second solenoid valve; the gas storage chamber body is arranged outside the annular primary side shell, the gas storage chamber cover is arranged at the upper end of the gas storage chamber body and is statically sealed by a sealing ring to form a sealed gas storage chamber, and insulating gas is stored in the gas storage chamber; the air pump, the third inner conduit, the second flow valve, the second solenoid valve and the fourth inner conduit are located in the gas storage chamber body, the second outer conduit is located outside the gas storage chamber body and is connected to the airbag, and the second control module is integrated in the base station control cabin.

7. The underwater wireless charging primary coil assembly according to claim 5 or 6, characterized in that: The small-diameter inner wall of the annular primary shell is an open structure, and a rubber cover is provided on the small-diameter inner wall to form the airbag, and the airbag is pre-filled with insulating gas with a pressure equal to the external seawater pressure; Alternatively, the small-diameter inner wall of the annular primary side housing is a closed structure, and a rubber airbag is provided on the small-diameter inner wall.

8. An underwater wireless charging coil assembly, comprising a secondary coil assembly; characterized in that: It also includes the underwater wireless charging primary coil assembly as described in any one of claims 1-7.

9. An underwater wireless charging device, characterized in that: Includes the underwater wireless charging coil assembly as described in claim 8.

10. The method for docking an underwater wireless charging coil assembly according to claim 8, characterized in that: The docking method is: When the underwater equipment equipped with the secondary coil assembly is docked with the underwater charging base station, the insulating medium charging and discharging device in the primary coil assembly is used to fill the insulating medium into the deformable medium storage bag on the inner wall of the small diameter of the annular primary shell to gradually expand it, so that the coil is gradually centered and the seawater in the coil coupling area is discharged; During the process of filling the insulating medium into the deformable medium reservoir, the fitting state of the deformable medium reservoir and the secondary coil assembly is detected by real-time image acquisition and recognition technology, or by real-time detection of the voltage pulse peak generated by the secondary coil assembly. When it is detected that the deformable medium reservoir and the secondary coil assembly are completely fitted together, the insulating medium charging and discharging device stops working, and the docking of the underwater wireless charging coil assembly is completed.

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