A wireless charging and signal transmission device for a deep-sea UUV docking system

Abstract

The application discloses a kind of wireless charging and signal transmission devices of deep-sea UUV interface system, including the transmitting end being installed on the interface platform and the receiving end being installed on the deep-sea UUV;Transmitting end and receiving end include respectively: coil / antenna integrated mounting, bottom is connected with adapter end cover, top is equipped with three recesses, antenna is installed in the first recess, magnetic core is installed in the second recess, coil is installed in the third recess, three recesses are unified by epoxy resin and are filled;Non-metallic sealing cover, cover in the top of antenna / coil integrated mounting;Adapter end cover is connected by water-tight cable and coil / antenna;Cavity, energy and signal output / receiving circuit are installed inside;Bottom end cover is installed with signal and electric composite water-tight connector that is connected with UUV or interface platform;Transmitting end further includes flexible guide cylinder, is fixed on coil / antenna integrated mounting.The device of the application is compact in size, light in weight, reliable in sealing, and can work reliably in deep-sea environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater wireless charging, in particular to a deep-sea UUV docking system wireless charging and signal transmission device. BACKGROUND

[0002] An unmanned underwater vehicle (UUV) is a kind of marine mobile observation platform, which can carry various sensors to carry out observation and detection tasks. However, the UUV is usually powered by a battery, which has limited energy and cannot stay and work underwater for a long time. Therefore, scientists propose to use a seabed docking base or docking platform to recover the UUV autonomously and charge it. Underwater wireless charging technology is a popular research direction of UUV underwater charging technology at present. Domestic and foreign research institutes have proposed different types of underwater wireless charging / signal transmission devices for UUV.

[0003] For example, the Chinese patent document with publication number CN 116714453 A discloses a UUV underwater charging device and charging method. The charging device includes a device shell, a central module is arranged in the device shell, the central module leads out a plurality of sub-modules, a fuel cell is arranged in the central module, the fuel cell is connected with an inverter and a central management module, a communication positioning module is connected to the central management module, a sub-management module is arranged in each sub-module, and the sub-management module is connected with the central management module; a wireless charging module and a guide light are connected to the sub-management module, wherein the wireless charging module is connected with the inverter of the central module and is uniformly distributed in the inner layer of the device shell, and is used for connecting with the external UUV to be charged. The Chinese patent document with publication number CN 116039412 A discloses a wireless charging communication modular cabin section for small UUVs, which includes a secondary side assembly, a pressure-resistant shell, a network connector, a CAN connector, a power connector and a charging communication module. The modular cabin section has zero buoyancy in water. The secondary side assembly is used to induce the magnetic field change of the external primary side coil to form an electric current. The pressure-resistant shell has a cylindrical cavity structure, and a groove is designed on one side of the radial direction of the pressure-resistant shell to accommodate the secondary side assembly and ensure that the secondary side assembly is conformal with the outer surface of the pressure-resistant shell. One end of the network connector, the CAN connector and the power connector is connected to the charging communication module, and the other end is respectively connected to the network switch, the CAN bus data link and the battery on the UUV. The secondary side assembly and the charging communication module are connected through an electrical connection cable.

[0004] At present, underwater wireless charging / transmission devices can be divided into two categories: one is that the coil / antenna is independently packaged, and then connected with the circuit cavity through a water-tight connector. The other is that the coil / antenna is made into an integrated body with the circuit cavity end cover through glue pouring, vulcanization and other ways, and then the wire / signal line of the coil / antenna is directly inserted into the cavity. However, the former has the defects of large volume and non-compact device, and once leakage occurs in the latter, water will directly enter the circuit cavity, which has serious consequences.

[0005] In addition, if it is applied in a deep sea environment, the sealing and pressure bearing comprehensive design is a difficulty regardless of which way is used. If the glue filling sealing scheme is used, stress concentration and leakage phenomenon will occur after the antenna and coil are slightly deformed in the glue, which is easy to damage the coil or antenna; if the oil filling sealing way is used, the device is in an internal and external pressure balance state, and the antenna and coil will directly bear high pressure, so many devices cannot directly bear high pressure; if the external shell directly bears pressure, the quality and volume of the package are very large, and the metal shell will hinder the magnetic field from penetrating, which seriously reduces the energy transmission and communication efficiency, and is not conducive to the integration of the UUV connection system.

[0006] From the above background analysis, it can be seen that there is an urgent need for a coil / antenna integrated packaging method which is reliable in sealing, can be applied in deep sea high pressure environment, and is compact in volume, to lay a foundation for the underwater wireless charging / transmission technology of UUV in deep sea environment. SUMMARY

[0007] The present application provides a deep sea UUV connection system wireless charging and signal transmission device, which is compact in volume, light in quality, reliable in sealing, and can work reliably in deep sea environment for a long time.

[0008] The technical scheme of the present application is as follows:

[0009] A deep sea UUV connection system wireless charging and signal transmission device, comprising a transmitting end installed on a connection platform and a receiving end installed on a deep sea UUV;

[0010] The transmitting end and the receiving end respectively comprise:

[0011] The coil / antenna integrated mounting member is connected with the adapter end cover at the bottom and is provided with a first recess, a second recess surrounding the first recess, and a third recess surrounding the second recess at the top, the antenna is installed in the first recess, the magnetic core is installed in the second recess, and the coil is installed in the third recess, the first recess and the third recess have through holes at the bottom for installing the water-tight seats of the water-tight cables connected with the antenna and the coil respectively; the first recess, the second recess and the third recess are uniformly poured with epoxy resin; the outer periphery of the third recess is provided with an O-ring;

[0012] The non-metallic sealing cover is covered on the top of the antenna / coil integrated mounting member;

[0013] Adapter end cap, connected via watertight cable and coil / antenna;

[0014] A cavity having an energy and signal output circuit installed therein, or an energy and signal receiving circuit installed therein;

[0015] The bottom end cover is equipped with a telecommunication and electrical composite watertight connector that connects to the UUV or docking platform;

[0016] The transmitting end further comprises a flexible guide tube for guiding the receiving end to dock with the transmitting end, and the flexible guide tube is fixed on the coil / antenna integrated mounting part of the transmitting end.

[0017] Preferably, a support tube for restraining the watertight cable is further provided between the coil / antenna integrated mounting piece and the adapter end cover; the support tube is composed of at least two arc-shaped plates.

[0018] The semicircular support tube must be installed before the flexible guide tube. This is done by inserting a circular array of screws through the integrated coil / antenna mounting assembly, then through the holes arranged around the circumference of the semicircular support tube, and finally connecting to the threaded holes in the adapter end cap. Before installing the semicircular support tube, the integrated coil / antenna mounting assembly must be connected to the watertight seat on the adapter end cap using a watertight cable. The cable is then secured within the support tube, improving connector space utilization.

[0019] Preferably, the top shell thickness of the non-metallic sealing cover is 0.5-1 mm, and the side wall thickness is not less than 5 mm. The thin top shell ensures that the distance between the coils / antennas at the transmitting end and the receiving end is short enough to improve transmission efficiency.

[0020] Preferably, the material of the non-metallic sealing cover is polyetheretherketone (PEEK).

[0021] The cavity of the transmitting end is equipped with an inverter, a primary resonant network circuit, a high / low voltage conversion circuit, and a signal processing circuit; the cavity of the receiving end is equipped with a signal transmission circuit, a secondary resonant network circuit, a high / low voltage conversion circuit, a rectifier, and a charging circuit.

[0022] The receiving end does not need to draw power from the UUV's battery. Instead, it uses the energy transmitted by the transmitting end through the coil for rectification and high and low voltage change conditioning, and then powers the signal transmission circuit of the receiving end and the isolation chip in the charging circuit, avoiding the inability to interact with data due to UUV battery connection failure.

[0023] Preferably, a permanent magnet is provided at the port of the flexible guide tube; a flange is provided on the outer wall of the coil / antenna integrated mounting piece at the receiving end, and a stainless iron ring adapted to the permanent magnet is provided on the flange.

[0024] The stainless steel ring of the receiving end can be adsorbed and locked with the permanent magnet of the end face of the flexible guide cylinder of the transmitting end in any rotating direction.

[0025] The inner wall of one end of the flexible guide cylinder is a cylindrical surface, and the cylindrical surface has an annular boss; the non-metallic sealing cover of the transmitting end is in contact with the annular boss; the other end of the flexible guide cylinder has a tapered inclined surface for guiding the receiving end.

[0026] The non-metallic sealing cover of the receiving end is in contact with the non-metallic sealing cover of the transmitting end under the guiding action of the flexible guide cylinder; if there is no obvious butt joint guiding deviation, the front end planes of the two non-metallic sealing covers will be in close contact; if there is butt joint guiding deviation (the UUV docking position deviation is too large), the front end of the two sealing covers will be in contact by relying on the deformation of the flexible guide cylinder, but cannot be completely in close contact, at this time, the permanent magnet and the stainless steel ring can still be adsorbed, and can overcome the interference of sea currents and the like.

[0027] The manufacturing method of the coil / antenna integrated mounting member comprises:

[0028] (1) winding the Litz wire into a cylindrical coil, winding the coil inductance value to half of the desired value, and then placing the coil after insulation treatment into the third groove;

[0029] (2) placing a plurality of magnetic cores into the second groove; after covering the non-metallic sealing cover, adjusting the size of the magnetic core and the number of turns of the coil according to whether the mutual inductance of the two coils of the transmitting end and the receiving end meets the requirements, until the mutual inductance of the two coils meets the requirements;

[0030] (3) installing a water-tight connector in the bottom of the integrated mounting member, and welding the wire inside the water-tight connector with the coil wire;

[0031] (4) smearing the vacuumized silicone liquid on the surface layer of the coil with a thickness of 0.5-1mm; smearing the vacuumized silicone liquid on the outer surface of the ceramic antenna with a thickness of 0.5-1mm;

[0032] (5) connecting the feed line of the ceramic antenna with the water-tight connector; after the silicone liquid is dry, installing the ceramic antenna in the first groove and fixing it;

[0033] (6) pouring the vacuumized epoxy resin liquid into the first groove, the second groove and the third groove, so that the epoxy resin liquid is slightly higher than the top of the integrated mounting member;

[0034] (7) after the epoxy resin is cured, turning the protruding epoxy resin part to be flush with the top of the packaging member, then covering the non-metallic sealing cover, and fixing it with radial screws.

[0035] Thus, the antenna / coil integrated packaging structure is completed.

[0036] When the non-metallic sealing cover bears external high pressure, the non-metallic sealing cover produces a slight deformation, close to the outer circumference of the integrated mounting member in the radial direction, and close to the top end face of the epoxy resin in the axial direction. Through the extrusion fit of the epoxy resin and the radial sealing O-ring, it is ensured that the deformation amount of the sealing cover is small enough when it bears high pressure, and the stress generated meets the strength requirement, realizing the lightweight high pressure sealing.

[0037] Compared with the prior art, the beneficial effects of the present application are:

[0038] (1) The coil and antenna integrated packaging technology of the present application uses a non-metallic thin shell sealing cover on one side to form an O-ring sealing structure for the internal epoxy resin pouring body, and the internal epoxy resin also provides structural support for the external sealing cover shell, avoiding the crushing of the shell under high pressure, and further enabling the package to have the advantages of high pressure bearing capacity, compact size, reliable sealing and no leakage;

[0039] (2) The antenna, magnetic core and coil packaging method of the present application uses soft glue pretreatment and then uses environmental resin pouring to solve the stress concentration and crushing problem of ceramic antenna and coil magnetic core packaging under high pressure deformation;

[0040] (3) The wireless energy and signal transmission device of the present application is locked by flexible guide cylinder, avoiding mechanical interference when UUV exists docking deviation. In the case of position offset of plug-in, the magnetic core can also constrain the coil magnetic field outside the antenna, that is, it has enough coupling coefficient in the case of coil misalignment, and can also suppress the interference brought by the magnetic field passing through the antenna, overcoming the problem that the plug-in type underwater wireless charging device requires high docking precision of UUV. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a schematic diagram of the UUV underwater wireless power / signal transmission device in use;

[0042] Figure 2 is a schematic diagram of the external structure of the device;

[0043] Figure 3 is a schematic diagram of the integrated installation of the coil and the antenna;

[0044] Figure 4 is a side view of the coil and antenna integrated mounting member;

[0045] Figure 5 is a sectional view of the flexible guide cylinder;

[0046] Figure 6 is a schematic diagram of the circuit architecture of the wireless power / signal transmission device. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be noted that the following examples are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0048] like Figure 1 As shown, a deep-sea UUV docking system consists of a UUV 1 and a docking platform 5. The UUV's wireless charging and signal transmission device includes a transmitter 3 and a receiver 2. The transmitter is raised and lowered by a hydraulic cylinder 4 to connect to the receiver.

[0049] like Figure 2 As shown, the transmitting end of the device includes:

[0050] The flexible guide tube 11 is made of high-hardness silicone rubber material and is used to guide the device to dock and guide it to the receiving end 2, while avoiding interference problems caused by UUV misalignment;

[0051] The permanent magnet 12 is fixed to the end face of the flexible guide tube and fastened by a countersunk screw. The number of permanent magnets used is determined by the insertion and extraction force that the lifting hydraulic cylinder 4 can provide;

[0052] The transmitting coil / antenna integrated mounting member 16 is provided on both the transmitting and receiving ends. The bottom of the mounting member is a flange structure, and its through hole is used for bolting to the flexible guide tube. The outer circumference has threaded holes 28 for mounting and fixing the non-metallic sealing cover 14.

[0053] like Figure 3 、 Figure 4 As shown, there are three grooves on the top of the above-mentioned integrated mounting part: the middle square-like groove is used to install the ceramic antenna 26, and there is a through hole at the bottom of the groove for installing the coaxial cable bending watertight seat 29. The thickness of the through hole is preferably 5 to 10 mm to ensure that the thread of the watertight seat can extend into the groove, thereby adjusting the bending direction of the watertight seat; the outer circular groove 22 is used to install the coil 23, and there is a through hole at the bottom of the groove for installing the bent 2-core watertight seat 30. Four circumferentially distributed grooves are set in the middle of the raised structure 24 between the two grooves for installing the magnetic core 25, which increases the self-inductance and mutual inductance of the coil, and constrains the direction of the magnetic field to prevent the magnetic field from passing through the middle ceramic antenna 26. The above three grooves are uniformly encapsulated with epoxy resin;

[0054] The non-metallic sealing cover 14 is placed on top of the transmitter antenna / coil integrated mounting assembly 15. The encapsulated coil / antenna structure is then secondary sealed via an O-ring 27 around the outer circumference of the integrated mounting assembly. The top shell of the sealing cover is preferably 0.5-1mm thick, with a radial thickness of no less than 5mm. This ensures that the distance between the transmitting and receiving coils / antennas is sufficiently short to improve transmission efficiency. The sealing cover is preferably made of a hard, strong non-metallic material such as PEEK.

[0055] Half-cylinder support cylinder 10, single-sided with 2 pieces, installed between the launch end adapter end cover and the launch end coil / antenna integrated mounting. The installation of the half-cylinder support cylinder 10 needs to be carried out before the installation of the flexible guide cylinder 11. The method is: through the circumferential array of screws, successively through the through hole 21 on the coil / antenna integrated mounting, the through hole arranged on the circumference of the half-cylinder support cylinder, and finally connected with the threaded hole on the adapter end cover 9. Before carrying out the installation of the half-cylinder support cylinder, the two water-tight seats need to be connected, that is, the water-tight seat on the coil / antenna integrated mounting and the water-tight seat on the adapter end cover 9 are connected through a water-tight cable, and then the cable is constrained in the cylinder through the half-cylinder support cylinder, thereby improving the space utilization of the connector.

[0056] Launch end adapter end cover 9, connected through a water-tight cable and a coil / antenna, transmits energy and signals in the cavity to the coil 23 and the antenna 26.

[0057] Launch end cavity 8, used for installing an inverter (including a main circuit and a driving circuit), a primary resonance network circuit, a high / low voltage conversion circuit, and a signal processing circuit.

[0058] Launch end bottom end cover 7, used for installing a signal and power composite water-tight connector 6, thereby connecting with a UUV docking platform 5. The UUV docking platform 5 provides energy for the launch end and communicates with the launch end through a network.

[0059] The receiving end includes a non-metallic sealing cover, an antenna / coil integrated mounting, a coil, an antenna, a magnetic core, a stainless steel ring, a half-cylinder support cylinder, a water-tight connector, a receiving end adapter end cover, a receiving end cavity, a receiving end bottom end cover, and a signal and power composite water-tight connector.

[0060] The external structure of the receiving end 2 is different from that of the launch end 3 in that there is no flexible guide cylinder 11 and permanent magnet 12, but a stainless steel ring 16 is installed on the bottom flange of the antenna / coil integrated mounting of the receiving end, so that it can be adsorbed and locked with the permanent magnet 12 on the end face of the guide cylinder of the launch end in any rotating direction.

[0061] The receiving end cavity is installed with a signal transmission circuit, a secondary resonance network, a high / low voltage conversion circuit, a rectifier, and a charging circuit.

[0062] The above charging circuit and signal transmission circuit are connected with a UUV through a signal and power composite water-tight connector, thereby completing charging and signal transmission.

[0063] The manufacturing process flow of the antenna / coil integrated packaging structure is as follows:

[0064] First step, use the litz wire to wind the cylindrical coil. Choose a cylinder tool, wind the first layer coil on the outer surface of the cylinder. Every time a circle is wound, use 502 glue to soak the wire, and wait for it to solidify; then, paste the insulating tape on the surface of the layer, and the insulating tape is not less than 5mm higher or lower than the bottom of the coil, to prevent cross breakdown; according to the above steps, wind the coil inductance value to half of the desired value;

[0065] Second step, take the coil off the cylinder tool, and completely wrap the inner and outer surfaces with insulating tape; then, put the coil into the ring groove of the antenna / coil integrated packaging, put a certain number of non-metallic ring gaskets at the bottom of the coil, and raise the height of the top of the coil to 2mm from the top of the integrated packaging. The transmitting end and the receiving end coil are operated in the same way according to the above steps;

[0066] Third step, place several magnetic cores in the four circumferentially distributed grooves in the middle of the integrated packaging, with the top of the magnetic core located 2mm below the top of the groove. Glue the magnetic cores in the groove and test the self-inductance of the coil. When the self-inductance of the coil meets the requirements, align the two sides of the packaging cover with the non-metallic sealing cover, and test whether the mutual inductance of the two coils meets the requirements. Continuously adjust the size of the magnetic core and the number of turns of the coil until the mutual inductance meets the requirements.

[0067] Fourth step, remove the two non-metallic sealing covers, and install the waterproof connector on the bottom of the two integrated packaging. Weld the inside wires of the connector with the coil wires, and wrap the welding part with insulating tape;

[0068] Fifth step, apply the vacuumed silicone liquid to the surface of the coil, with a thickness of 0.5-1mm;

[0069] Sixth step, apply the vacuumed silicone liquid to the outer surface of the ceramic antenna, with a thickness of 0.5-1mm. Connect the antenna feed line with the waterproof connector, and also use silicone liquid to coat the SMA joint. After the silicone liquid is dry, install the ceramic antenna at a distance of 1-2mm from the top of the packaging, and fix it;

[0070] Seventh step, pour the vacuumed epoxy resin liquid into all the grooves, and fill the liquid to make it slightly higher than the top of the integrated packaging under the action of tension;

[0071] Eighth step, after the epoxy resin is solidified, use a lathe to turn the protruding epoxy resin part to be completely flush with the top of the packaging. Then, put on the non-metallic sealing cover and fix it with radial screws.

[0072] At this point, the antenna / coil integrated packaging structure is completed.

[0073] When the non-metallic sealing cover bears external high pressure, the sealing cover produces a slight deformation, close to the outer circumference of the integrated package in the radial direction, and close to the top end face of the epoxy resin in the axial direction. By turning the epoxy resin and extruding the radial sealing O-ring, it is ensured that the deformation of the sealing cover is small enough when it bears high pressure, and the stress generated meets the strength requirement, realizing lightweight high-pressure sealing.

[0074] The flexible guide tube in the device is used as follows:

[0075] As shown in Figure 5 , the transmitting end coil sealing cover is installed from the non-tapered side, and the front end of the sealing cover is in contact with the bottom 31 of the cylindrical groove on the non-tapered side of the flexible guide tube. The receiving end coil sealing cover is guided by the flexible guide tube and contacts the transmitting end coil sealing cover along the tapered slope 33. If there is no obvious butt joint deviation, the front ends of the two non-metallic sealing covers will be in close contact. If there is butt joint deviation (UUV docking position deviation is too large), the deformation of the flexible guide tube will guide the contact of the front ends of the two sealing covers, but they cannot be completely in close contact. At this time, the permanent magnet installed in the hole 34 and the stainless steel ring on the other side can still be attracted, overcoming the interference of factors such as ocean currents.

[0076] As shown in Figure 6 , the power flow method of the UUV connection system is as follows:

[0077] The receiving end does not need to take power from the UUV battery, but uses the energy transmitted by the transmitting end coil to rectify, change the high and low voltage, and then supply power to the isolation chip in the signal transmission circuit and the charging circuit of the receiving end, avoiding the failure of the UUV battery connection that causes the data to be unable to interact.

[0078] The above embodiments have described the technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, supplement and equivalent replacement within the scope of the principles of the present application should be included in the protection scope of the present application.

Claims

1. A wireless charging and signal transmission device for a deep-sea UUV docking system, characterized in that: It includes a transmitter installed on the docking platform and a receiver installed on the deep-sea UUV; The transmitting end and the receiving end respectively include: The coil / antenna integrated mounting component is connected to the adapter end cap at the bottom and has a first groove, a second groove surrounding the first groove, and a third groove surrounding the second groove at the top. The antenna is installed in the first groove, the magnetic core is installed in the second groove, and the coil is installed in the third groove. The bottoms of the first and third grooves have through holes for installing watertight seats for watertight cables connecting the antenna and coil, respectively. The first, second, and third grooves are uniformly potted with epoxy resin; an O-ring is provided on the periphery of the third groove. A non-metallic sealing cover is placed on top of the antenna / coil integrated mounting assembly; Adapter end cap, connected via watertight cable and coil / antenna; A cavity having an energy and signal output circuit installed therein, or an energy and signal receiving circuit installed therein; The bottom end cover is equipped with a telecommunication and electrical composite watertight connector that connects to the UUV or docking platform; The transmitting end further comprises a flexible guide tube for guiding the receiving end to dock with the transmitting end, and the flexible guide tube is fixed on the coil / antenna integrated mounting part of the transmitting end.

2. The deep-sea UUV docking system wireless charging and signal transmission device according to claim 1, characterized in that: A support tube for restraining the watertight cable is further provided between the coil / antenna integrated mounting piece and the adapter end cover; the support tube is composed of at least two arc-shaped plates.

3. The deep-sea UUV docking system wireless charging and signal transmission device according to claim 1, characterized in that: The thickness of the top shell of the non-metallic sealing cover is 0.5-1 mm; the thickness of the side wall is not less than 5 mm.

4. The deep-sea UUV docking system wireless charging and signal transmission device according to claim 1, characterized in that: The material of the non-metallic sealing cover is polyetheretherketone.

5. The deep-sea UUV docking system wireless charging and signal transmission device according to claim 1, characterized in that: The cavity of the transmitting end is equipped with an inverter, a primary resonant network circuit, a high / low voltage conversion circuit, and a signal processing circuit; the cavity of the receiving end is equipped with a signal transmission circuit, a secondary resonant network circuit, a high / low voltage conversion circuit, a rectifier, and a charging circuit.

6. The deep-sea UUV docking system wireless charging and signal transmission device according to claim 1, characterized in that: The port of the flexible guide tube is provided with a permanent magnet; the outer wall of the coil / antenna integrated mounting piece at the receiving end is provided with a flange, and the flange is provided with a stainless iron ring adapted to the permanent magnet.

7. The deep-sea UUV docking system wireless charging and signal transmission device according to claim 1, characterized in that: The inner wall of one end of the flexible guide tube is a cylindrical surface with an annular boss on the cylindrical surface, and the non-metallic sealing cover of the transmitting end contacts the annular boss; the other end of the flexible guide tube has a conical inclined surface for guiding the receiving end.

8. The deep-sea UUV docking system wireless charging and signal transmission device according to claim 1, characterized in that: The manufacturing method of the coil / antenna integrated mounting assembly includes: (1) Winding the Litz wire into a cylindrical coil, reducing the coil inductance to half of the desired value, insulating the coil, and placing it into the third groove; (2) placing a plurality of magnetic cores into the second groove; after covering with a non-metallic sealing cover, adjusting the size of the magnetic cores and the number of coil turns according to whether the mutual inductance of the transmitting and receiving coils meets the requirements, until the mutual inductance of the two coils meets the requirements; (3) Install a watertight connector at the bottom of the integrated mounting piece, and weld the inner wire of the watertight connector to the coil wire; (4) Apply the vacuumized silicone liquid to the surface of the coil with a thickness of 0.5 to 1 mm; apply the vacuumized silicone liquid to the outer surface of the ceramic antenna with a thickness of 0.5 to 1 mm; (5) Connect the feeder of the ceramic antenna to the watertight connector; after the silicone liquid dries, install the ceramic antenna in the first groove and fix it; (6) Pour the vacuumed epoxy resin liquid into the first groove, the second groove, and the third groove so that the epoxy resin liquid is slightly higher than the top of the integrated mounting part; (7) After the epoxy resin is cured, the raised epoxy resin part is turned until it is flush with the top of the package, and then the non-metallic sealing cover is put on and fixed with radial screws.

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