CN118849818B - Coil assembly, wireless charging device and method for improving underwater wireless charging efficiency - Google Patents
Coil assembly, wireless charging device and method for improving underwater wireless charging efficiency Download PDFInfo
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- CN118849818B CN118849818B CN202411351341.3A CN202411351341A CN118849818B CN 118849818 B CN118849818 B CN 118849818B CN 202411351341 A CN202411351341 A CN 202411351341A CN 118849818 B CN118849818 B CN 118849818B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 59
- 239000013535 sea water Substances 0.000 claims abstract description 28
- 230000008878 coupling Effects 0.000 claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 63
- 229920001971 elastomer Polymers 0.000 claims description 21
- 229910000859 α-Fe Inorganic materials 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 210000001503 joint Anatomy 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a coil assembly, a wireless charging device and a method for improving the underwater wireless charging efficiency, aiming at solving the technical problem that the existing underwater wireless charging device is low in power transmission efficiency. According to the invention, the deformable medium storage bag and the insulating medium charging and discharging device for charging and discharging the insulating medium into and from the deformable medium storage bag are additionally arranged in the primary coil assembly positioned at 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 being in butt joint, thereby reducing and even eliminating the eddy current loss caused by the seawater in the coil coupling area to the greatest extent, and improving the electric energy transmission efficiency.
Description
Technical Field
The invention relates to the technical field of power supply circuit devices or systems.
Background
The underwater wireless charging device can realize underwater wireless power supply of underwater equipment such as unmanned underwater vehicle and submerged buoy, and effectively improve the endurance and concealment of the underwater equipment such as unmanned underwater vehicle and submerged buoy. As shown in fig. 1-2, taking an example of wireless electric energy supplementing of an unmanned underwater vehicle by an underwater wireless charging device, a primary coil 2 of the underwater wireless charging device is installed at the upper part of an underwater charging base station 1 through a coil housing flange, a secondary coil 3 is installed at the abdomen of the unmanned underwater vehicle 4, a base station control cabin 11 is arranged at the side surface of the underwater charging base station 1, a primary circuit 12 is arranged in the base station control cabin 11 and is electrically connected with the primary coil 2 in a wired mode, when the unmanned underwater vehicle 4 falls above the underwater charging base station 1, and after the primary coil 2 is aligned with the secondary coil 3, electric energy supplied by the underwater charging base station 1 is firstly inverted to high-frequency alternating current through a high-frequency inverter circuit in the primary coil 12 and is 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 and the secondary coil 3 are in a linked excitation induction electromotive force, and the direct current is converted into direct current through a rectifier in the secondary circuit 13, and the direct current is converted into a battery pack to charge the required voltage, so that the electric energy is output to the underwater wireless charging device 4 through the underwater charging base station.
Because the primary coil 2 and the secondary coil 3 cannot be completely attached to each other due to the accuracy of the docking between the unmanned submersible vehicle 4 and the underwater charging base station 1, a seawater medium exists between the primary coil 2 and the secondary coil 3 after the unmanned submersible vehicle 4 is docked with the underwater charging base station 1. Because the seawater has conductivity, the high-frequency alternating electromagnetic field excited by the primary coil 2 of the underwater wireless charging device can generate eddy current loss in a coil coupling area, so that the electric energy transmission efficiency of the underwater wireless charging device is reduced.
In order to improve the electric energy transmission efficiency of the underwater wireless charging device, the existing methods reduce the eddy current loss by changing the topological structure of the coil or adjusting the coil current, however, the improvement effect of the methods on the electric energy transmission efficiency is not obvious, and the electric energy transmission efficiency is still lower.
Disclosure of Invention
The invention provides a coil assembly, a wireless charging device and a method for improving the underwater wireless charging efficiency, aiming at solving the technical problem that the existing underwater wireless charging device is low in power transmission efficiency.
The technical scheme of the invention is as follows:
The primary coil assembly for improving the underwater wireless charging efficiency is characterized by comprising a primary shell, a planar primary coil and a primary ferrite core, wherein the planar primary coil and the primary ferrite core are arranged in the primary shell, and the primary ferrite core is paved below the primary coil;
The upper end of the primary side shell is provided with a deformable medium storage bag, and the lower end of the primary side shell is provided with an insulating medium charging and discharging device;
the insulating medium charging and discharging device is used for charging insulating medium into the deformable medium storage bag to expand the deformable medium storage bag so as to discharge seawater in the coil coupling area after the secondary coil is in butt joint with the primary coil, and extracting and reflowing the insulating medium in the deformable medium storage bag after charging is finished so as to restore deformation of the deformable medium storage bag.
Further, the insulating medium filling and discharging device is an oil filling and discharging device, the insulating medium is heat conduction insulating oil, and the deformable medium storage bag is a sealing oil bag.
The oil filling and draining device comprises an oil storage cabin cover, an oil storage cabin body, a pump, a first inner conduit, a flow valve, a second inner conduit, an electromagnetic valve, an outer conduit and a control module, wherein the pump, the first inner conduit, the flow valve, the second inner conduit, the electromagnetic valve and the outer conduit are sequentially connected, the control module is used for controlling the pump, the flow valve and the electromagnetic valve, the oil storage cabin body is arranged below the primary side shell, the oil storage cabin cover is arranged at the upper end of the oil storage cabin body and is sealed through a sealing ring in a static mode to form a sealed oil storage cabin, heat conducting insulating oil is stored in the oil storage cabin, the oil storage cabin cover is simultaneously connected with the lower end of the primary side shell, the pump, the first inner conduit, the flow valve, the electromagnetic valve and the second inner conduit are located in the oil storage cabin, the outer conduit is located outside the oil storage cabin body and is communicated with the sealing oil bag, and the control module is integrated in a base station control cabin.
The sealing oil bag is formed by the rubber cover and the rubber cover, and the sealing oil bag is pre-filled with heat conduction insulating oil with the oil pressure equal to the external seawater pressure;
or the upper end and the lower end of the primary side shell are both closed, and the outer surface of the upper end of the primary side shell is provided with a rubber sealing oil bag.
Optionally, the insulating medium charging and discharging device may be a charging and discharging device, the insulating medium is insulating gas, and the deformable medium storage bag is a sealing air bag.
The air pump, the third inner conduit, the second flow valve, the fourth inner conduit, the second electromagnetic valve and the fourth inner conduit are sequentially connected, the second control module is used for controlling the air pump, the second flow valve and the second electromagnetic valve, the air storage cabin is arranged below the primary side shell, the air storage cabin is arranged at the upper end of the air storage cabin and is statically sealed through a sealing ring to form a sealed air storage cabin, insulating air is stored in the air storage cabin, the air storage cabin is also connected with the lower end of the primary side shell, the air pump, the third inner conduit, the second flow valve, the second electromagnetic valve and the fourth inner conduit are located in the air storage cabin, the second outer conduit is located outside the air storage cabin and is communicated with the sealing air bag, and the second control module is integrated in the base station control cabin.
The sealing air bag is formed by the rubber cover and the rubber cover, and insulating gas with the air pressure equal to the external seawater pressure is pre-filled in the sealing air bag;
or the upper end and the lower end of the primary side shell are both closed, and the outer surface of the upper end of the primary side shell is provided with a rubber sealing air bag.
The invention further provides a wireless charging coil assembly for improving the underwater wireless charging efficiency, which comprises a secondary coil assembly and is characterized by further comprising the primary coil assembly.
The invention also provides an underwater wireless charging device which is characterized by comprising the wireless charging coil assembly.
The invention also provides a method for improving the underwater wireless charging efficiency, which is characterized by comprising the following steps:
Step 1, replacing a wireless charging coil assembly in the existing underwater wireless charging device with the wireless charging coil assembly, if the replaced wireless charging coil assembly is not matched with the parameters of the existing primary side circuit and secondary side circuit, entering step 2, and if the replaced wireless charging coil assembly is matched with the parameters of the existing primary side circuit and secondary side circuit, entering step 3;
step 2, modifying parameters of a primary side circuit and a secondary side circuit in the existing underwater wireless charging device to enable the parameters to be matched with the replaced wireless charging coil assembly;
Step 3, after the underwater equipment provided with the secondary coil is in butt joint with the underwater charging base station, filling an insulating medium into a deformable medium storage bag at the upper end of the primary side shell through an insulating medium filling and discharging device in the primary side coil assembly to expand the deformable medium storage bag and discharging seawater in a coil coupling area until the deformable medium storage bag is completely attached to the secondary side shell;
And 4, after the charging is finished, extracting the insulating medium from the deformable medium storage bag at the upper end of the primary side shell through the insulating medium charging and discharging device in the primary side coil assembly until the insulating medium is recovered to deform.
The beneficial effects of the invention are as follows:
1. the coil assembly has the function of discharging the seawater in the coil coupling area after being butted, and the coil coupling area has little eddy current loss after the seawater is discharged, so the electric energy transmission efficiency is high.
2. When underwater equipment such as unmanned submarine vehicles and the like shakes due to ocean current impact, the deformable medium storage bag can play a role in buffering and protecting the underwater equipment and the underwater charging base station.
3. The invention can reduce or even eliminate the eddy current loss caused by the sea water in the coil coupling area to the greatest extent by only changing the primary coil assembly arranged on the side of the underwater charging base station, and does not need to change the underwater equipment end such as the unmanned submarine, thereby meeting the severe requirements of the underwater equipment on the weight and the size of the underwater equipment on the technical index of long voyage.
4. The invention can design the primary side shell and the deformable medium storage bag to be relatively independent, at the moment, the deformable medium storage bag and the insulating medium charging and discharging device can be added on the basis of the existing underwater wireless charging device, the circuit parameters can be adjusted to be matched with the coil assembly, the primary side shell, the coil structure and the circuit topology of the original underwater wireless charging device are not required to be redesigned, and the improvement and implementation cost is reduced.
5. When the insulating medium filling and discharging device adopts the oil filling and discharging device and the deformable medium storage bag adopts the sealing oil bag, the coil assembly and the wireless charging device can be used in a deepwater environment, on one hand, the oil filling and discharging device can fill heat-conducting insulating oil into the sealing oil bag to discharge seawater in a coil coupling area so as to reduce eddy current loss, and on the other hand, heat generated by a primary coil can be led out to external seawater through the heat-conducting insulating oil, so that the working reliability of the primary coil is improved.
6. The primary coil assembly, the wireless charging coil assembly and the underwater wireless charging device can be sold independently/in a set, so that the requirements of different use scenes are met.
7. The primary coil assembly and the wireless charging coil assembly are planar coil assemblies, and are suitable for underwater equipment with most shapes.
Drawings
FIG. 1 is a schematic illustration of docking with an underwater charging base station when an unmanned submersible vehicle is charged underwater.
Fig. 2 is a schematic diagram of an underwater wireless charging device.
Fig. 3 is a schematic structural diagram of a first embodiment of the present invention (primary side housing-seal oil bladder integrated design).
FIG. 4 is a schematic illustration of an embodiment of the present invention after a sealed oil bladder is filled with oil.
Fig. 5 is a schematic structural diagram of a second embodiment of the invention (primary side housing-seal oil bladder versus freestanding design).
FIG. 6 is a schematic diagram of a second embodiment of the present invention after the sealed oil bladder is filled in place.
Fig. 7 is a cloud of eddy current losses in the coil coupling region prior to filling the sealed oil bladder in accordance with the present invention.
Fig. 8 is a cloud of eddy current losses in the coil coupling area after the seal oil bladder is filled in place in the present invention.
Reference numerals:
The device comprises a 1-underwater charging base station, a 2-primary coil, a 3-secondary coil and a 4-unmanned submarine;
5-a rubber cap;
6-an oil filling and discharging device, 601-an oil storage cabin cover, 602-an oil storage cabin body, 603-a pump, 604-an oil inlet and outlet, 605-a first inner conduit, 606-a flow valve, 607-a second inner conduit, 608-an electromagnetic valve, 609-an outer conduit and 610-heat conduction insulating oil;
7-primary side shell, 8-primary side ferrite core, 9-secondary side shell, 10-secondary side ferrite core, 11-base station control cabin, 12-primary side circuit, 13-secondary side circuit and 14-sealing oil bag.
Detailed Description
The invention is further described in detail below with reference to the drawings and examples.
Embodiment one:
As shown in fig. 3, the present embodiment provides a wireless charging coil assembly for improving underwater wireless charging efficiency, which includes a primary coil assembly and a secondary coil assembly. The primary coil assembly comprises a primary shell 7, a planar primary coil 2, a primary ferrite core 8, a rubber cover 5 and an oil filling and discharging device 6. The secondary coil assembly comprises a secondary housing 9, a planar secondary coil 3 and a secondary ferrite core 10.
The primary side casing 7 has an open end at its upper end and a closed end at its lower end. The primary coil 2 and the primary ferrite core 8 are both arranged in the primary shell 7, the primary ferrite core 8 is laid below the primary coil 2 (the primary ferrite core 8 is closer to the underwater charging base station after installation), and the primary coil 2 is connected with a primary circuit in the base station control cabin in a wired mode. The rubber cover 5 (for example, a silica gel cover or a thermoplastic elastomer cover) is arranged at the upper end of the primary side shell 7, is fastened by a flange after being adhered to the primary side shell 7, forms a sealing oil bag, and is internally provided with heat-conducting insulating oil 610 in a preset manner in the sealing oil bag in an initial state, wherein the internal oil pressure is equal to the external seawater pressure (on one hand, the sealing oil bag can be prevented from being flattened by the seawater pressure to influence the installation space of the primary side coil, on the other hand, the time for discharging the seawater in a coupling area can be shortened), the sealing oil bag is separated from the secondary side shell, and after the heat-conducting insulating oil is filled in the sealing oil bag through an oil filling and discharging device, the sealing oil bag is gradually expanded to be gradually adhered to the secondary side shell.
The oil filling and discharging device 6 is arranged below the primary side shell 7 and is communicated with the sealing oil bag. By using the oil filling and discharging device, the heat-conducting insulating oil is filled into the sealing oil bag to expand the upper rubber cover 5 outwards, and the heat-conducting insulating oil 610 is extracted from the sealing oil bag to restore the deformation of the upper rubber cover 5.
In this embodiment, the oil filling and discharging device 6 includes an oil storage hatch 601, an oil storage hatch 602, a pump 603, a first inner pipe 605, a flow valve 606, a second inner pipe 607, an electromagnetic valve 608, and an outer pipe 609, which are connected in this order, and a control module (existing unit, not shown) for controlling the pump 603, the flow valve 606, and the electromagnetic valve 608. The oil storage cabin cover 601 is arranged at the upper end of the oil storage cabin body 602 and is statically sealed through a sealing ring to form a sealed oil storage cabin, heat conduction insulating oil (such as transformer oil) is stored in the oil storage cabin, the pump 603, the first inner conduit 605, the flow valve 606, the electromagnetic valve 608 and the second inner conduit 607 are positioned in the oil storage cabin body 602, the outer conduit 609 is positioned outside the oil storage cabin body 602 and is communicated with the primary side shell 7, the primary side shell 7 is arranged at the upper end of the oil storage cabin cover 601 and is fixedly connected with the primary side shell, the oil inlet and outlet 604 is positioned below the shell of the pump 603, and the control module is integrated in a base station management and control cabin at the side of the underwater charging base station.
The working principle of the oil filling and discharging device 6 is as follows:
The control module can realize the mode switching of oil filling and oil discharging by controlling the forward and reverse rotation mode switching of the pump 603, can realize the opening and closing of an oil path by controlling the electromagnetic valve 608, and can adjust the oil filling and discharging rate by controlling the flow valve 606.
When the oil is filled, the voltage pulse generated by the primary coil 2 is kept unchanged, the control module monitors the voltage pulse peak value generated by the secondary coil 3 in real time, the seawater in the coil coupling area is gradually discharged along with the gradual expansion of the sealing oil bag, the eddy current loss of the coil coupling area is gradually reduced in the process, so that the voltage pulse peak value generated by the secondary coil 3 is gradually increased, when the control module monitors that the voltage pulse peak value generated by the secondary coil 3 is not changed any more, the eddy current loss is reduced to the minimum, the sealing oil bag is completely attached to the secondary shell 9 without continuing oil filling, and at the moment, the control module can control the electromagnetic valve 608 to act to close an oil way, and calculate the current oil filling amount through the flow rate and the oil filling time of the flow valve 606.
When the oil is discharged, the control module calculates the oil discharge flow in real time according to the flow rate of the flow valve 606 and the oil discharge time, and when the oil discharge flow is equal to the oil charge amount, the control module indicates that the sealed oil bag is restored to the initial state, and at the moment, the control module can control the electromagnetic valve 608 to act to close the oil path.
The secondary coil 3 and the secondary ferrite core 10 are both arranged inside the secondary shell 9, the secondary ferrite core 10 is paved below the secondary coil 3, and the secondary ferrite core 10 is arranged closer to underwater equipment after being installed. The secondary side shell 9 is processed by adopting an integrated encapsulating molding technology.
Taking unmanned submarine 4 as an example, the working principle of this embodiment is as follows:
After the unmanned submersible vehicle 4 needs to be charged and is in butt joint with the underwater charging base station 1, the pump 603 and the electromagnetic valve 608 are started through the control module, heat conduction insulating oil enters the pump 603 from the oil storage cabin 602 through the oil inlet and outlet 604, and then enters the sealing oil bag through the first inner conduit 605, the flow valve 606, the second inner conduit 607, the electromagnetic valve 608 and the outer conduit 609 in sequence. In the oil filling process, the pressure inside the sealed oil bag is gradually increased and is larger than the external water pressure, so that the rubber cover 5 is expanded outwards, and the seawater medium between the primary coil 2 and the secondary coil 3 is gradually reduced under the extrusion of the rubber cover 5. When the rubber cover 5 is fully attached to the secondary side housing 9 (as shown in fig. 4), the pump 603 and the solenoid valve 608 are closed to finish oil filling, and at this time, the sea water in the coupling area between the primary side coil 2 and the secondary side coil 3 is substantially emptied, so that efficient wireless charging can be realized.
After the charging is finished, the pump 603 and the electromagnetic valve 608 are started to drain oil for the sealed oil bag, and the heat conduction insulating oil 610 in the sealed oil bag flows back and is stored in the oil storage cabin 602 after passing through the outer conduit 609, the electromagnetic valve 608, the second inner conduit 607, the flow valve 606, the first inner conduit 605 and the pump 603, the sealed oil bag is gradually recovered to deform, and the rubber cover 5 is gradually separated from the secondary side shell 9.
During this period, the flow valve 606 is adjusted to control the oil filling and discharging speeds, and the oil filling speed should ensure that the unmanned submersible vehicle 4 will not shake due to too high oil filling speed, and no special requirement is imposed on too high oil discharging speed.
Embodiment two:
as shown in fig. 5, the present embodiment provides a wireless charging coil assembly for improving the underwater wireless charging efficiency, and the principle of the wireless charging coil assembly of the present embodiment is the same as that of the first embodiment and has a similar structure, and the difference in structure is that the upper end and the lower end of the primary side housing 7 are both closed, a sealing oil bag 14 which is relatively independent from the primary side housing 7 is added on the upper surface of the primary side housing 7, and the sealing oil bag 14 is fastened with a flange after being adhered to the primary side housing 7. Accordingly, the outer conduit 609 in the oil filling and draining device is no longer in communication with the primary side casing 7, but is in communication with the separate sealing oil bladder 14. Because the independent sealing oil bag is adopted in the embodiment, whether the heat conduction insulating oil is preset in the sealing oil bag in the initial state does not affect the installation space of the primary coil and only affects the oil filling time required by discharging the seawater in the coupling area, the heat conduction insulating oil can be preset in the sealing oil bag in the embodiment to balance the external seawater pressure, shorten the oil filling time and avoid the heat conduction insulating oil. In this embodiment, after filling the sealing oil bag 14 with oil, a schematic diagram of the sealing oil bag 14 when it is completely attached to the secondary side casing 9 is shown in fig. 6.
Compared with the scheme of an integrated oil bag (a cavity shared by a sealed oil bag and a primary side shell), the embodiment does not need to redesign the primary side shell of the original wireless charging device, and has lower improvement cost and higher reliability.
And (3) effect verification:
Fig. 7-8 are eddy current loss cloud diagrams of the coil coupling regions before and after oil filling of the sealed oil bag in the present embodiment, it can be seen from fig. 7 that the eddy current loss before oil filling is mainly concentrated in the sea water region between the primary coil and the secondary coil, and it can be seen from fig. 8 that the eddy current loss between the primary coil and the secondary coil after oil filling is eliminated, and only the eddy current loss caused by the stray electromagnetic field exists outside the coil, and the eddy current loss density and loss region of the portion are smaller, so that the influence on the power transmission efficiency is small.
Embodiment III:
The present embodiment provides a wireless charging coil assembly for improving the underwater wireless charging efficiency, and the principle is the same as that of the first embodiment and the structure is similar to that of the first embodiment, and the difference is that a control module in the oil charging and discharging device 6 in the present embodiment needs to control the oil charging and discharging by means of an image which is acquired by a camera arranged on an underwater charging base station and contains a sealed oil bag and a secondary side shell. Specifically, when oil is filled, the control module controls the electromagnetic valve to act to close the oil path when the control module recognizes that the sealing oil bag is completely attached to the secondary side shell from the image acquired by the camera, and stops oil filling, and when oil is discharged, the control module controls the electromagnetic valve to act to close the oil path and stop oil discharging when the control module recognizes that the sealing oil bag is basically restored to an initial state from the image acquired by the camera.
Embodiment four:
The embodiment provides a wireless charging coil assembly for improving the underwater wireless charging efficiency, the principle of the embodiment is similar to that of the first embodiment and the second embodiment, and the difference is that a sealing oil bag in the first embodiment and the second embodiment is replaced by a sealing air bag, correspondingly, an oil filling and discharging device is replaced by an oil filling and discharging device, the structure principle of the oil filling and discharging device is similar to that of the oil filling and discharging device, insulating gas can be filled into the sealing air bag through an air pump, the insulating gas in the sealing air bag is extracted and stored in a backflow mode through the air pump, the opening and closing of an air path are controlled through an electromagnetic valve, and the air filling and discharging speed is controlled through a flow valve.
Fifth embodiment:
The embodiment provides an underwater wireless charging device which can be used in shallow water environments and is more suitable for deep water environments, and the underwater wireless charging device is different from the conventional underwater wireless charging device disclosed in the prior art in that the wireless charging coil assembly provided by the first embodiment or the second embodiment of the invention is adopted, or a sealing oil bag is additionally arranged at the upper end of an original side shell of the conventional underwater wireless charging device, and meanwhile, an oil charging and discharging device communicated with the sealing oil bag is additionally arranged below the original side shell and used for charging oil into the sealing oil bag and discharging oil from the sealing oil bag. At this time, the primary side circuit and the secondary side circuit parameters should be adjusted in a matching manner according to the improved wireless charging coil assembly, and specifically how to adjust the circuit parameters to be the existing mature technology.
Example six:
The embodiment provides an underwater wireless charging device used in a shallow water environment, which is different from the conventional underwater wireless charging device disclosed in the prior art in that the wireless charging coil assembly provided by the fourth embodiment of the invention is adopted, or a sealing air bag is additionally arranged at the upper end of an original side shell in the conventional underwater wireless charging device, and meanwhile, an air charging and discharging device communicated with the sealing air bag is additionally arranged below the original side shell and used for charging and discharging air into and from the sealing air bag. At this time, the primary side circuit and the secondary side circuit parameters should be adjusted in a matching manner according to the improved wireless charging coil assembly, and specifically how to adjust the circuit parameters to be the existing mature technology.
Embodiment seven:
The embodiment provides a method for improving underwater wireless charging efficiency, which comprises the following steps:
Step 1, replacing a primary coil assembly in the existing underwater wireless charging device with the primary coil assembly of the invention, or replacing the wireless charging coil assembly in the existing underwater wireless charging device with the wireless charging coil assembly of the invention, if the replaced wireless charging coil assembly is not matched with the parameters of the existing primary circuit and secondary circuit, entering step 2, if the replaced wireless charging coil assembly is matched with the parameters of the existing primary circuit and secondary circuit, directly entering step 3;
step 2, modifying parameters of a primary side circuit and a secondary side circuit in the existing underwater wireless charging device to enable the parameters to be matched with the replaced wireless charging coil assembly;
Step 3, after the underwater equipment provided with the secondary coil is in butt joint with the underwater charging base station, filling heat-conducting insulating oil/insulating gas into a sealing oil bag/sealing air bag at the upper end of the primary side shell through an oil filling and discharging device/gas filling and discharging device in the primary side coil assembly to enable the sealing oil bag/sealing air bag to expand outwards, and discharging seawater in a coil coupling area until the sealing oil bag/sealing air bag is completely attached to the secondary side shell;
And 4, after the charging is finished, extracting heat conduction insulating oil/insulating gas from the sealing oil bag/sealing air bag at the upper end of the primary side shell through the oil charging and discharging device/the gas charging and discharging device in the primary side coil assembly until the heat conduction insulating oil/insulating gas recovers deformation.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411351341.3A CN118849818B (en) | 2024-09-26 | 2024-09-26 | Coil assembly, wireless charging device and method for improving underwater wireless charging efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411351341.3A CN118849818B (en) | 2024-09-26 | 2024-09-26 | Coil assembly, wireless charging device and method for improving underwater wireless charging efficiency |
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