Coil assembly, wireless charging device and method for improving underwater wireless charging efficiency

Abstract

In order to solve the technical problem of low power transmission efficiency of existing underwater wireless charging devices, the present invention provides a coil assembly, a wireless charging device and a method for improving underwater wireless charging efficiency. The present invention adds a deformable medium storage bag and an insulating medium charging and discharging device for filling and extracting insulating medium into 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 after docking, thereby minimizing or even eliminating the eddy current loss caused by seawater in the coil coupling area, and improving the power transmission efficiency.

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 wireless power supply of the underwater wireless charging device to the unmanned submersible as an example, the primary coil 2 of the underwater wireless charging device is installed on the upper part of the underwater charging base station 1 through the coil housing flange, the secondary coil 3 is installed on the belly of the unmanned submersible 4, the base station control cabin 11 is arranged on the side of the underwater charging base station 1, and the primary circuit 12 is arranged in the base station control cabin 11 and is electrically connected to the primary coil 2 by wire; when the unmanned submersible 4 falls on the top of the underwater charging base station 1, and the primary coil 2 is aligned with the secondary coil 3, 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 12 and input into the primary coil 2, the primary coil 2 generates an alternating magnetic field under the action of the high-frequency alternating current, the alternating magnetic field is linked with the secondary coil 3 to excite the induced electromotive force, and is converted into direct current through the rectifier in the secondary circuit 13, the direct current is converted into the voltage required for charging the battery pack of the submersible through the battery charger, so that the electric energy output by the underwater charging base station 1 is supplied to the unmanned submersible 4 through the underwater wireless charging device.

[0003] Due to the docking accuracy between the unmanned underwater vehicle 4 and the underwater charging base station 1, the primary coil 2 and the secondary coil 3 cannot be completely fitted together. Therefore, after the unmanned underwater vehicle 4 is docked with the underwater charging base station 1, there will be seawater medium between the primary coil 2 and the secondary coil 3. Since seawater is conductive, the high-frequency alternating electromagnetic field excited by the primary coil 2 of the underwater wireless charging device will generate eddy current loss in the coil coupling area, resulting in a decrease in the power transmission efficiency of the underwater wireless charging device.

[0004] In order to improve the power transmission efficiency of underwater wireless charging devices, the existing method is to reduce eddy current loss by changing the topological structure of the coil or adjusting the coil current. However, these methods have little effect on improving the power transmission efficiency, and the power transmission efficiency is still low. Summary of the invention

[0005] In order to solve the technical problem of low power transmission efficiency of existing underwater wireless charging devices, the present invention provides a coil component, a wireless charging device and a method for improving underwater wireless charging efficiency.

[0006] The technical solution of the present invention is:

[0007] The primary coil assembly for improving underwater wireless charging efficiency is special in that it includes a primary shell, a planar primary coil arranged in the primary shell, and a primary ferrite core, wherein the primary ferrite core is laid under the primary coil;

[0008] The upper end of the primary shell is provided with a deformable medium storage bag, and the lower end is provided with an insulating medium charging and discharging device;

[0009] The insulating medium charging and discharging device is used to fill the deformable medium storage bag with insulating medium to expand it so as to discharge the seawater in the coil coupling area after the secondary coil and the primary coil are docked, and to extract the insulating medium in the deformable medium storage bag and reflow it for storage after charging is completed so as to restore its deformation.

[0010] Furthermore, the insulating medium filling and discharging device is an oil filling and discharging device, the insulating medium is thermally conductive insulating oil, and the deformable medium storage bag is a sealed oil bag.

[0011] 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 below the primary side shell body, 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, in which heat-conducting insulating oil is stored; the oil storage tank cover is also connected to the lower end of the primary side shell body; 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 sealed oil bag, and the control module is integrated in the base station control cabin.

[0012] Furthermore, the upper end of the primary shell is open and the lower end is closed; a rubber cover is provided at the open end of the primary shell, and the two form the sealed oil bag, and the sealed oil bag is pre-filled with heat-conducting insulating oil with an oil pressure equal to the external seawater pressure; the rubber cover is bonded to the primary shell and then fastened with a flange;

[0013] Alternatively, the upper and lower ends of the primary shell are both closed, and a rubber sealing oil bag is provided on the outer surface of the upper end.

[0014] Optionally, 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 a sealed air bag.

[0015] Furthermore, 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 below the primary side shell body, 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 gas storage chamber cover is also connected to the lower end of the primary side shell body; the air pump, the third inner conduit, the second flow valve, the second solenoid valve and the fourth inner conduit are located inside the gas storage chamber body, the second outer conduit is located outside the gas storage chamber body and is connected to the sealed airbag, and the second control module is integrated in the base station control cabin.

[0016] Furthermore, the primary shell has an upper opening and a lower closing; a rubber cover is provided at the open end of the primary shell, and the two form the sealing airbag, and the sealing airbag is pre-filled with insulating gas with a pressure equal to the external seawater pressure; the rubber cover is bonded to the primary shell and then fastened with a flange;

[0017] Alternatively, the upper and lower ends of the primary shell are both closed, and a rubber sealing airbag is provided on the outer surface of the upper end.

[0018] The present invention further provides a wireless charging coil assembly for improving underwater wireless charging efficiency, including a secondary coil assembly; the special feature of the wireless charging coil assembly is that the wireless charging coil assembly also includes the primary coil assembly described above.

[0019] The present invention also provides an underwater wireless charging device, which is special in that it includes the above-mentioned wireless charging coil assembly.

[0020] The present invention also provides a method for improving underwater wireless charging efficiency, which is special in that it includes the following steps:

[0021] Step 1: Replace the wireless charging coil assembly in the existing underwater wireless charging device with the above-mentioned wireless charging coil assembly. If the replaced wireless charging coil assembly does not match the parameters of the existing primary circuit and the secondary circuit, proceed to step 2; if the replaced wireless charging coil assembly matches the parameters of the existing primary circuit and the secondary circuit, proceed to step 3;

[0022] Step 2: Modify the parameters of the primary circuit and the secondary circuit in the existing underwater wireless charging device to match the replaced wireless charging coil assembly;

[0023] Step 3: After the underwater equipment equipped with the secondary coil is docked with the underwater charging base station, the insulating medium is filled into the deformable medium storage bag at the upper end of the primary shell through the insulating medium charging and discharging device in the primary coil assembly to expand it and discharge the seawater in the coil coupling area until the deformable medium storage bag is completely fitted with the secondary shell;

[0024] Step 4: After charging is completed, the insulating medium is drawn out from the deformable medium storage bag at the upper end of the primary shell through the insulating medium charging and discharging device in the primary coil assembly until it recovers its deformation.

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

[0026] 1. The coil assembly of the present invention has the function of discharging seawater in the coil coupling area after 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.

[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 and protect the underwater equipment and 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 minimize or even eliminate the eddy current loss caused by seawater in the coil coupling area, and no modification is required on the underwater equipment end such as unmanned submersibles, which can meet the strict requirements on its weight and size of the technical indicators of long flight time and long range of underwater equipment; 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 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 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 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 primary shell are designed to be relatively independent, when the deformable dielectric storage capsule is damaged, it will only affect the working efficiency of the primary coil but not its normal operation, so the relatively independent design has higher reliability.

[0030] 5. When the insulating medium charging and discharging device in the present invention adopts an oil charging and discharging device and the deformable medium storage bag adopts a sealed 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 sealed oil bag with thermal insulating oil to discharge the seawater in the coil coupling area to reduce eddy current loss. On the other hand, the heat generated by the primary coil can be discharged to the external seawater through the thermal insulating oil, thereby improving the working reliability of the 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 the wireless charging coil assembly of the present invention are planar coil assemblies, which are suitable for underwater equipment of most shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of an unmanned submersible docking with an underwater charging base station during underwater charging.

[0034] Figure 2 This is the schematic diagram of the underwater wireless charging device.

[0035] Figure 3 It is a schematic structural diagram of the first embodiment of the present invention (primary housing-sealing oil bag integrated design).

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

[0037] Figure 5 It is a schematic diagram of the structure of the second embodiment of the present invention (relatively independent design of the primary housing and the sealing oil bag).

[0038] Figure 6 It is a schematic diagram of the sealing oil bag after being filled with oil in the second embodiment of the present invention.

[0039] Figure 7 It is a cloud diagram of eddy current loss in the coil coupling area before the sealing oil bag is filled with oil in the present invention.

[0040] Figure 8 This is a cloud diagram of eddy current loss in the coil coupling area after the sealing oil bag is fully filled with oil in the present invention.

[0041] Reference numerals:

[0042] 1- underwater charging base station; 2- primary coil; 3- secondary coil; 4- unmanned submersible;

[0043] 5-Rubber cover;

[0044] 6- oil filling 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;

[0045] 7-primary housing; 8-primary ferrite core; 9-secondary housing; 10-secondary ferrite core; 11-base station control cabin; 12-primary circuit; 13-secondary circuit; 14-sealed oil bag. DETAILED DESCRIPTION

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

[0047] Embodiment 1:

[0048] like Figure 3 As shown, this embodiment provides a wireless charging coil assembly for improving underwater wireless charging efficiency, including a primary coil assembly and a secondary coil assembly. The primary coil assembly includes a primary housing 7, a planar primary coil 2, a primary ferrite core 8, a rubber cover 5, and an oil charging and discharging device 6. The secondary coil assembly includes a secondary housing 9, a planar secondary coil 3, and a secondary ferrite core 10.

[0049] The upper end of the primary housing 7 is an open end, and the lower end is a closed end. The primary coil 2 and the primary ferrite core 8 are both arranged in the primary housing 7, and the primary ferrite core 8 is laid below the primary coil 2 (after installation, the primary ferrite core 8 is closer to the underwater charging base station), and the primary coil 2 is connected to the primary circuit in the base station control cabin by wire. The rubber cover 5 (such as a silicone cover or a thermoplastic elastomer cover) is arranged at the upper end of the primary housing 7, and is fastened with a flange after being adhered to the primary housing 7, and the two form a sealed oil bag; in the initial state, the sealed oil bag is pre-set with heat-conducting insulating oil 610, and the internal oil pressure is equal to the external seawater pressure (on the one hand, it can prevent the seawater pressure from flattening the sealed oil bag and affecting the installation space of the primary coil, and on the other hand, it can shorten the time of discharging the seawater in the coupling area), and the sealed oil bag is separated from the secondary housing; after the sealed oil bag is filled with heat-conducting insulating oil by the oil filling and discharging device, the sealed oil bag will gradually expand and gradually fit with the secondary housing.

[0050] The oil filling and discharging device 6 is arranged below the primary housing 7 and is connected to the sealing oil bag. The oil filling and discharging device can be used to fill the sealing oil bag with heat-conducting insulating oil to expand the rubber cover 5 on the upper part outward, and to draw the heat-conducting insulating oil 610 out of the sealing oil bag to restore the deformation of the rubber cover 5 on the upper part.

[0051] In this embodiment, the oil filling and discharging device 6 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 (such as transformer 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, and the outer conduit 609 is located outside the oil storage tank body 602 and is connected to the primary side shell 7; the primary side shell 7 is arranged at the upper end of the oil storage tank cover 601 and is fixedly connected thereto; the oil inlet and outlet 604 are located below the shell 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.

[0052] The working principle of the oil filling and discharging device 6 is:

[0053] The control module can switch between filling and draining modes by controlling the forward and reverse modes of the pump 603 , can open and close the oil circuit by controlling the solenoid valve 608 , and can adjust the filling and draining rates by controlling the flow valve 606 .

[0054] When filling with oil, the voltage pulse generated by the primary coil 2 is kept unchanged, and the control module monitors the voltage pulse peak generated by the secondary coil 3 in real time. As the sealed 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 generated by the secondary coil 3 gradually increases. When the control module monitors that the voltage pulse peak generated by the secondary coil 3 no longer changes, the eddy current loss has been reduced to the minimum, indicating that the sealed oil bag and the secondary shell 9 are completely fitted and no further oil filling is required. At this time, the control module can control the solenoid valve 608 to close the oil circuit, and calculate the current oil filling amount through the flow rate of the flow valve 606 and the oil filling time.

[0055] When draining the oil, the control module calculates the drain flow rate in real time based on 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 sealed oil bag has returned to its initial state. At this time, the control module can control the solenoid valve 608 to close the oil circuit.

[0056] The secondary coil 3 and the secondary ferrite core 10 are both arranged inside the secondary housing 9. The secondary ferrite core 10 is laid below the secondary coil 3. After installation, the secondary ferrite core 10 is closer to the underwater equipment. The secondary housing 9 is processed by integrated potting molding technology.

[0057] Taking the unmanned underwater vehicle 4 as an example, the working principle of this embodiment is as follows:

[0058] When the unmanned submersible 4 needs to be charged and completes docking with the underwater charging base station 1, the pump 603 and the solenoid valve 608 are turned on through the control module, and the thermal insulating oil enters the pump 603 from the oil storage tank 602 through the oil inlet and outlet 604, and then enters the sealed 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 sealed oil bag gradually increases and exceeds the external water pressure, causing the rubber cover 5 to expand outward. Under the pressure of the rubber cover 5, the seawater medium between the primary coil 2 and the secondary coil 3 gradually decreases. When the rubber cover 5 is completely fitted with the secondary shell 9 (such as Figure 4 As shown), the pump 603 and the solenoid valve 608 are turned off to end the oil filling. At this time, the seawater in the coupling area between the primary coil 2 and the secondary coil 3 is basically drained, and efficient wireless charging can be achieved.

[0059] When charging is completed, the pump 603 and the solenoid valve 608 are turned on to drain the oil from the sealed oil bag. The thermally conductive insulating oil 610 in the sealed 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 sealed oil bag gradually recovers its deformation, and the rubber cover 5 gradually separates from the secondary side shell 9.

[0060] During this period, the flow valve 606 can be adjusted to control the speed of oil filling and oil discharge. The oil filling speed should ensure that the unmanned underwater vehicle 4 will not shake due to excessively fast oil filling speed. There is no special requirement for the oil discharge speed to be too fast or too slow.

[0061] Embodiment 2:

[0062] like Figure 5 As shown, this embodiment provides a wireless charging coil assembly for improving the efficiency of underwater wireless charging. The principle of the wireless charging coil assembly of this embodiment is the same as that of the first embodiment and the structure is similar. The difference in structure is that: in this embodiment, the upper and lower ends of the primary shell 7 are closed, and a sealing oil sac 14 which is relatively independent of the primary shell 7 is added to the upper surface of the primary shell 7. The sealing oil sac 14 is adhered to the primary shell 7 and fastened with a flange. Correspondingly, the outer conduit 609 in the oil filling and discharging device is no longer connected to the primary shell 7, but is connected to the independent sealing oil sac 14. Since an independent sealing oil sac is used in this embodiment, whether the sealing oil sac is pre-set with thermal conductive insulating oil in the initial state does not affect the installation space of the primary coil, but only affects the oil filling time required to discharge the seawater in the coupling area. Therefore, the sealing oil sac in this embodiment can be pre-set with thermal conductive insulating oil to balance the external seawater pressure and shorten the oil filling time, or it can be pre-set with thermal conductive insulating oil. After the sealing oil sac 14 is filled with oil in this embodiment, the schematic diagram of the sealing oil sac 14 and the secondary shell 9 are completely fitted as shown in FIG. Figure 6 shown.

[0063] Compared with the integrated oil bag solution of the first embodiment (the sealed oil bag and the primary housing share a cavity), this embodiment does not require redesign of the primary housing of the original wireless charging device, has lower improvement costs, and higher reliability.

[0064] Effect verification:

[0065] Figure 7-8 is the eddy current loss cloud diagram of the coil coupling area before and after the sealing oil bag is filled with oil in this embodiment. Figure 7 It can be seen that the eddy current loss before oil filling is mainly concentrated in the seawater area between the primary coil and the secondary coil. Figure 8 It can be seen that after oil filling, the eddy current loss between the primary coil and the secondary coil is eliminated, and only the eddy current loss caused by the stray electromagnetic field exists outside the coil. The eddy current loss density and loss area of ​​this part are small, and have little effect on the power transmission efficiency.

[0066] Embodiment three:

[0067] This embodiment provides a wireless charging coil assembly for improving the efficiency of underwater wireless charging. Its principle is the same as that of the first embodiment and its structure is similar. The difference is that the control module in the oil filling and discharging device 6 in this embodiment needs to use the image of the sealed oil sac and the secondary shell collected by the camera set on the underwater charging base station to control the oil filling and oil discharging amount. Specifically, when filling the oil, the control module recognizes from the image collected by the camera that the sealed oil sac is completely fitted with the secondary shell, and the control module controls the solenoid valve to close the oil circuit and stop filling the oil; when discharging the oil, the control module recognizes from the image collected by the camera that the sealed oil sac has basically returned to its initial state, and the control module controls the solenoid valve to close the oil circuit and stop discharging the oil.

[0068] Embodiment 4:

[0069] The present embodiment provides a wireless charging coil assembly for improving the efficiency of underwater wireless charging. The principle of the present embodiment is the same as that of the first and second embodiments and the structure is similar. The only difference is that the sealed oil bag in the first and second embodiments is replaced by a sealed air bag, and correspondingly, the oil charging and discharging device is replaced by an air charging and discharging device. The structural principle of the air charging and discharging device is similar to that of the oil charging and discharging device. Insulating gas can be filled into the sealed air bag by an air pump, and the insulating gas in the sealed air bag can be extracted and refluxed for storage by the air pump. The opening and closing of the air path is controlled by an electromagnetic valve, and the charging and discharging speed is controlled by a flow valve.

[0070] Embodiment five:

[0071] 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 wireless charging coil assembly provided by the first or second embodiment of the present invention is adopted; or a sealed oil bag is added to the upper end of the primary shell of the existing underwater wireless charging device, and at the same time, an oil filling and discharging device connected to the sealed oil bag is added below the primary shell for filling and discharging oil into the sealed oil bag. At this time, the parameters of the primary circuit and the secondary circuit should be matched and adjusted according to the improved wireless charging coil assembly, and how to adjust the circuit parameters is an existing mature technology.

[0072] Embodiment six:

[0073] This embodiment provides an underwater wireless charging device for use in a shallow water environment. The difference between the underwater wireless charging device and the conventional underwater wireless charging device disclosed in the prior art is that: the wireless charging coil assembly provided by the fourth embodiment of the present invention is adopted; or a sealed airbag is added to the upper end of the primary shell in the existing underwater wireless charging device, and at the same time, a charging and deflation device connected to the sealed airbag is added below the primary shell for inflating and deflation of the sealed airbag. At this time, the parameters of the primary circuit and the secondary circuit should be matched and adjusted according to the improved wireless charging coil assembly, and how to adjust the circuit parameters is an existing mature technology.

[0074] Embodiment seven:

[0075] This embodiment provides a method for improving underwater wireless charging efficiency, including the following steps:

[0076] Step 1: Replace the primary coil assembly in the existing underwater wireless charging device with the primary coil assembly of the present invention, or replace the wireless charging coil assembly in the existing underwater wireless charging device with the wireless charging coil assembly of the present invention; if the replaced wireless charging coil assembly does not match the parameters of the existing primary circuit and the secondary circuit, proceed to step 2; if the replaced wireless charging coil assembly matches the parameters of the existing primary circuit and the secondary circuit, directly proceed to step 3;

[0077] Step 2: Modify the parameters of the primary circuit and the secondary circuit in the existing underwater wireless charging device to match the replaced wireless charging coil assembly;

[0078] Step 3: After the underwater equipment equipped with the secondary coil is connected to the underwater charging base station, the sealing oil bag / sealed air bag at the upper end of the primary shell is filled with heat-conducting insulating oil / insulating gas through the oil-charging / gas-charging device / gas-charging device in the primary coil assembly to expand the sealing oil bag / sealed air bag outward, and the seawater in the coil coupling area is discharged until the sealing oil bag / sealed air bag is completely fitted with the secondary shell;

[0079] Step 4: After charging is completed, the thermal insulating oil / insulating gas is extracted from the sealed oil bag / sealed air bag at the upper end of the primary shell through the oil charging and discharging device / gas charging and discharging device in the primary coil assembly until it recovers its deformation.

Claims

1. A primary coil assembly for improving underwater wireless charging efficiency, characterized in that: It comprises a primary shell, a planar primary coil and a primary ferrite core arranged in the primary shell, wherein the primary ferrite core is laid under the primary coil; The upper end of the primary shell is provided with a deformable medium storage bag, and the lower end is provided with an insulating medium charging and discharging device; The insulating medium charging and discharging device is used to charge the insulating medium into the deformable medium storage bag to expand it so as to discharge the seawater in the coil coupling area after the secondary coil and the primary coil are docked, and to extract the insulating medium in the deformable medium storage bag and reflow it for storage after charging is completed so as to restore its deformation; 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 a sealed oil bag; The oil filling and discharging device comprises 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 below the 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, in which heat-conducting insulating oil is stored; the oil storage tank cover is also connected to the lower end of the primary side shell; 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 sealed oil bag, and the control module is integrated in the base station control cabin; The primary housing has an open upper end and a closed lower end; a rubber cover is provided at the open end of the primary housing, and the two form the sealed oil bag, and the sealed oil bag is pre-filled with heat-conducting insulating oil with an oil pressure equal to the external seawater pressure; the rubber cover is bonded to the primary housing and then fastened with a flange; Alternatively, the upper and lower ends of the primary shell are both closed, and a rubber sealing oil bag is provided on the outer surface of the upper end.

2. A primary coil assembly for improving underwater wireless charging efficiency, characterized in that: It comprises a primary shell, a planar primary coil and a primary ferrite core arranged in the primary shell, wherein the primary ferrite core is laid under the primary coil; The upper end of the primary shell is provided with a deformable medium storage bag, and the lower end is provided with an insulating medium charging and discharging device; The insulating medium charging and discharging device is used to charge the insulating medium into the deformable medium storage bag to expand it so as to discharge the seawater in the coil coupling area after the secondary coil and the primary coil are docked, and to extract the insulating medium in the deformable medium storage bag and reflow it for storage after charging is completed so as to restore its deformation; The insulating medium charging and discharging device is a gas charging and discharging device, the insulating medium is an insulating gas, and the deformable medium storage bag is a sealed air bag; The gas charging and discharging device comprises 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 below the 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 gas storage chamber cover is also connected to the lower end of the primary side shell; 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 sealed airbag, and the second control module is integrated in the base station control cabin; The primary shell has an upper opening and a lower closing. The open end of the primary shell is provided with a rubber cover, and the two form the sealing airbag, and the sealing airbag is pre-filled with insulating gas with a pressure equal to the external seawater pressure. The rubber cover is bonded to the primary shell and then fastened with a flange. Alternatively, the upper and lower ends of the primary shell are both closed, and a rubber sealing airbag is provided on the outer surface of the upper end.

3. A wireless charging coil assembly for improving underwater wireless charging efficiency, comprising a secondary coil assembly; characterized in that: It also includes the primary coil assembly described in any one of claims 1-2.

4. An underwater wireless charging device, characterized in that: Includes the wireless charging coil assembly as described in claim 3.

5. A method for improving underwater wireless charging efficiency, characterized in that: The following steps are involved: Step 1: Replace the wireless charging coil assembly in the existing underwater wireless charging device with the wireless charging coil assembly described in claim 3. If the replaced wireless charging coil assembly does not match the parameters of the existing primary circuit and the secondary circuit, proceed to step 2; if the replaced wireless charging coil assembly matches the parameters of the existing primary circuit and the secondary circuit, proceed to step 3; Step 2: Modify the parameters of the primary circuit and the secondary circuit in the existing underwater wireless charging device to match the replaced wireless charging coil assembly; Step 3: After the underwater equipment equipped with the secondary coil is docked with the underwater charging base station, the insulating medium is filled into the deformable medium storage bag at the upper end of the primary shell through the insulating medium charging and discharging device in the primary coil assembly to expand it and discharge the seawater in the coil coupling area until the deformable medium storage bag is completely fitted with the secondary shell; Step 4: After charging is completed, the insulating medium is drawn out from the deformable medium storage bag at the upper end of the primary shell through the insulating medium charging and discharging device in the primary coil assembly until it recovers its deformation.

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