Metal shielding net device of underwater electromagnetic coupler

Abstract

The invention provides a metal shielding net device of an underwater electromagnetic coupler. The frame comprises a plurality of inner supporting rods and outer supporting rods supporting the metal shielding net between the inner supporting rods and the outer supporting rods. The storage bag in the frame surrounds the transmitting end coil and the receiving end coil inside in the charging process, is attached to the transmitting end coil and the receiving end coil and extrudes the shielding net. The shielding net is wound on the reel and can be unfolded and folded from the reel. When the electromagnetic guide rail in the frame slideway is electrified, the slide block and the pull rod move along the guide rail so as to pull the shielding net to wind circumferentially to change the thickness. The pump fills seawater into the storage bag to enable the storage bag to deform so as to extrude the shielding net to change the appearance of the shielding net. Through the deformable storage bag and the metal shielding net which can change the thickness and change the shape under extrusion of the storage bag, interference of an external electric field is effectively blocked and attenuated, a high-frequency discrete electric field generated by the coil is effectively bound in the space between the couplers, the high-frequency discrete electric field generated by the coil is effectively isolated, and the coupling efficiency is improved. And the underwater wireless charging efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric field shielding of underwater electromagnetic couplers, and in particular relates to a metal shielding net device of an underwater electromagnetic coupler. Background Art

[0002] In the fields of marine engineering, underwater robots and submarine cables, underwater electromagnetic couplers are key components for wireless power transmission and signal transmission. The stability and efficiency of their performance directly affect the operation of the entire system.

[0003] During the wireless power transmission process of underwater equipment, the coupler will be disturbed by the external electric field on the one hand, and on the other hand, a high-frequency discrete electric field will be generated outside the coil coupling area, which will diffuse freely in the water and form eddy currents. The eddy current effect will cause fluctuations in the charging system parameters and energy loss, thereby reducing the efficiency of power transmission.

[0004] As an important component of electromagnetic couplers, the main function of metal shielding is to block and attenuate the interference of external electric fields through its topological shape and material properties, while ensuring the stable transmission of internal electric fields. In underwater environments, due to the conductivity of seawater, the propagation and attenuation characteristics of electric fields are significantly different from those in the air, which requires that the design of metal shielding must fully consider this characteristic.

[0005] Traditional metal shielding nets often adopt simple plane or grid structures. Although they can block external electric field interference to a certain extent, their effects are often limited in the complex and changeable underwater environment. They cannot completely block the penetration of external electric fields, nor can they prevent the internal electric field from scattering outside the coupling area of ​​the coupler. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the underwater electromagnetic coupler in the prior art cannot block the external electric field through the metal shielding net and a high-frequency discrete electric field is generated outside the coupling area, resulting in low charging efficiency, and to provide an underwater electromagnetic coupler metal shielding net device. The device can change the thickness and shape of the metal shielding layer, specifically, the electromagnetic slider and the electromagnetic guide rail drive the pull rod to continuously wrap the metal shielding net around the storage capsule to change the thickness, and then use a pump to fill seawater into the storage capsule to change the shape of the storage capsule, and change the shape of the metal shielding net by squeezing the deformed storage capsule, so as to achieve the best electric field shielding effect.

[0007] To achieve the above purpose, the technical solution provided by the present invention is:

[0008] An underwater electromagnetic coupler metal shielding net device comprises a housing, a metal shielding net, a storage capsule, a shielding net reel, a pull rod, a pump, an electromagnetic slider and an electromagnetic guide rail;

[0009] The housing includes a base plate and a cylindrical frame connected to each other, a transmitting end coil assembly including a transmitting end coil is coaxially mounted to the frame at the bottom inside the frame, the frame includes a plurality of inner support rods and outer support rods uniformly distributed in the circumferential direction, for supporting the metal shielding net therebetween, and the frame is provided with a circumferential slideway at the bottom between the inner support rods and the outer support rods;

[0010] The storage capsule is annular, deformable and coaxially connected to the frame inside the frame, and is used to surround the transmitting end coil and the receiving end coil inside the ring, fit with the two, and squeeze the metal shielding mesh during the charging process;

[0011] The shielding net reel is coaxially arranged on the base plate outside the frame, and the metal shielding net is wound on the shielding net reel and can be unfolded and retracted therefrom, and can be deformed under pressure;

[0012] The pull rod is connected with the electromagnetic slider and the metal shielding net. The electromagnetic guide rail is annular and installed in the slideway. When power is turned on, the electromagnetic slider and the pull rod can move along the electromagnetic guide rail to pull the metal shielding net to unfold and circumferentially wind between the inner support rod and the outer support rod to change the thickness.

[0013] The pump is installed on the base plate, and is used to fill seawater into the storage bag after the metal shielding net is wound to a predetermined thickness so that the storage bag is deformed and the metal shielding net is squeezed to change the shape of the metal shielding net, and to discharge the filled seawater after the receiving end coil leaves so that the storage bag can restore its deformation.

[0014] Furthermore, the metal shielding net device also includes a shielding net retracting assembly, which is used to automatically retract the metal shielding net and wind it onto the shielding net reel.

[0015] Furthermore, the shielding net retraction assembly includes a ratchet mechanism, an electromagnet and a spring, and the shielding net reel includes a core shaft, a sleeve and a cover plate; the core shaft is connected to the base plate, the spring and the sleeve are sequentially sleeved on the core shaft, the two ends of the spring are respectively fixed to the core shaft and the sleeve, the sleeve can rotate relative to the core shaft, and the cover plate is connected to the core shaft at the end faces of the core shaft and the sleeve; the electromagnet and the ratchet mechanism have pawls arranged on the cover plate, and the ratchet mechanism has ratchet arranged on the sleeve, and when the electromagnet is not energized, the pawl is stuck in the tooth groove of the ratchet to prevent the ratchet from reversing when the metal shielding net is unfolded and causing the metal shielding net to be retracted; when the electromagnet is energized, the pawl is attracted to leave the ratchet, and the sleeve rotates relative to the core shaft under the action of the restoring force of the spring to retract the metal shielding net.

[0016] Further, the ratchet is an integral part of the sleeve.

[0017] Further, four inner support rods are arranged, and four outer support rods are arranged.

[0018] The advantages of the present invention are:

[0019] 1. The underwater electromagnetic coupler metal shielding net device of the present invention provides a ring-shaped deformable storage capsule and a metal shielding net that can be wound around the storage capsule between the receiving end and the transmitting end. When the receiving end on the underwater equipment is aligned with the transmitting end at the device, the metal shielding net is wound through an electromagnetic slider and an electromagnetic guide rail. When the appropriate thickness is reached, the storage capsule is filled with seawater to deform and expand, and the receiving end coil and the transmitting end coil can be surrounded on the inner side of the ring. The inner wall of the storage capsule fits the two, and at the same time, the outer wall of the storage capsule squeezes the metal shielding net to adjust the shape of the shielding net, thereby achieving the best electric field shielding effect. Therefore, the present invention can not only effectively block and attenuate the interference of the external electric field through a deformable storage bag and a metal shielding net with changeable thickness and shape when the storage bag is squeezed, but also effectively confine the high-frequency discrete electric field generated by the coil during the charging process to the space between the couplers, effectively isolate the high-frequency discrete electric field generated by the coil, and prevent it from freely diffusing in the water outside the coil coupling area and forming eddy currents to cause charging system parameter fluctuations and energy loss, thereby improving the efficiency of underwater wireless charging, shortening the charging time of underwater equipment, and extending the operating time of the equipment underwater.

[0020] 2. During underwater wireless charging, the metal shielding net acts as a solid barrier to isolate the potential impact of high-frequency discrete electric fields on other sensitive components inside the aircraft. This avoids the degradation or damage of component performance caused by electric field interference, ensures the stable operation of various systems of the aircraft, and improves its overall safety and reliability.

[0021] 3. The metal shielding net wrapping the receiving coil and the transmitting coil confines the electric field inside the coupler, greatly reducing the risk of the aircraft being detected by the outside world due to electrical radiation. This feature is particularly important for aircraft performing covert missions, as it can effectively improve the concealment of the aircraft and ensure its safety in complex underwater environments.

[0022] 4. The shielding net retraction assembly including a ratchet mechanism and a spring is used to realize automatic retraction of the shielding net with a simple structure, making the entire device compact. The shielding net can be retracted by the restoring force of the spring only by energizing the electromagnet, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or other features and advantages of the present invention will become more easily understood through the following description with reference to the accompanying drawings, which are not drawn to scale and some features are exaggerated or reduced to show details of specific components. In the accompanying drawings:

[0024] Figure 1 is a schematic three-dimensional diagram of the underwater electromagnetic coupler metal shielding net device of the present invention;

[0025] Figure 2is a cross-sectional view of the underwater electromagnetic coupler metal shielding net device of the present invention aligned with the receiving end during use;

[0026] Figure 3 is a schematic three-dimensional diagram of a substrate in a housing in the present invention;

[0027] Figure 4 is a cross-sectional view of a substrate in a housing in the present invention;

[0028] Figure 5 is a schematic three-dimensional diagram of the storage capsule of the present invention;

[0029] Figure 6 is a schematic three-dimensional diagram of the shielding net retracting assembly of the present invention;

[0030] Figure 7 is a cross-sectional view of a shielding mesh retraction assembly in the present invention;

[0031] Figure 8 It is a working flow chart of the underwater electromagnetic coupler metal shielding net device of the present invention.

[0032] In the figure: 1-shell, 11-base plate, 111-recess, 112-opening, 113-cavity, 12-frame, 121-inner support rod, 122-outer support rod, 123-slide; 2-metal shielding net; 3-storage capsule, 31-flange; 4-shielding net reel, 41-core shaft, 42-sleeve, 43-cover plate; 5-pull rod; 6-pump; 7-electromagnetic slider; 8-electromagnetic guide rail, 9-shielding net retraction assembly, 91-ratchet mechanism, 911-pawl, 912-ratchet, 92-electromagnet, 93-spring; 100-transmitter magnetic core, 101-transmitter coil, 200-receiver magnetic core, 201-receiver coil. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments of the present invention. It should be noted that the following detailed description of the present invention is only for the purpose of illustration, and is not intended to limit the present invention.

[0034] The present invention provides a metal shielding net device for an underwater electromagnetic coupler, which can be connected to an underwater wireless charging base station to dock with underwater equipment such as UUVs that need to be powered on, thereby performing wireless charging. The receiving end coil assembly is arranged on the underwater equipment, and the transmitting end coil assembly is arranged on the shielding net device. When the UUV needs to be powered on, the two are docked to achieve wireless power transmission. The shielding net device of the present invention is used to effectively confine the high-frequency discrete electric field generated by the coil of the underwater electromagnetic coupler in the process of charging the underwater equipment within the space between the couplers, effectively isolate the high-frequency discrete electric field generated by the coil, and prevent it from freely diffusing in the water outside the coil coupling area and forming eddy currents to cause fluctuations in charging system parameters and energy loss, thereby improving the efficiency of underwater wireless charging.

[0035] Overall reference Figure 1 and Figure 2 As an exemplary embodiment of the present invention, the underwater electromagnetic coupler metal shielding net device includes a housing 1, a metal shielding net 2, a storage capsule 3, a shielding net reel 4, a pull rod 5, a pump 6, an electromagnetic slider 7 and an electromagnetic guide rail 8. The housing 1 is used to support the metal shielding net device, connect it to the base station, and accommodate the transmitting end coil assembly, which may include a transmitting end magnetic core 100 and a transmitting end coil 101 laid thereon. Correspondingly, the receiving end coil assembly may include a receiving end magnetic core 200 and a receiving end coil 201 laid thereon. The storage capsule 3 is used to align with the receiving end coil 201 during charging, and to fit with the transmitting end coil 101 and the receiving end coil 201 at both ends during the charging process. The metal shielding net 2 is wound on the shielding net reel 4, can be unfolded and retracted therefrom, and is wound around the storage capsule 3 for multiple turns during the unfolding process. The pull rod 5, the electromagnetic slider 7 and the electromagnetic guide rail 8 are used to jointly realize the movement of the metal shielding net 2 around the storage capsule 3. The pump 6 can pump seawater and other media into the storage capsule 3 to expand and deform it, and discharge seawater from the storage capsule 3 to restore its deformation. When the storage capsule 3 expands, it can squeeze the surrounding metal shielding net 2, causing the metal shielding net 2 to change its shape to achieve the best shielding effect, thereby effectively blocking and attenuating the interference of the external electric field on the one hand, and effectively confining the high-frequency discrete electric field generated by the coil during the charging process in the space between the couplers on the other hand, effectively isolating the high-frequency discrete electric field generated by the coil. It should be pointed out that the optimal thickness and shape of the metal shielding net 2 can be determined by measuring the electric field strength, specifically by directly measuring the electric field strength in space using an electric field strength meter (electric field meter). When the electric field leaks, the electric field strength near the leak point will change, and by measuring these changes, it can be determined whether there is electric field leakage.

[0036] The housing 1 includes a base plate 11 and a cylindrical frame 12 connected to each other. Figure 3 and Figure 4The substrate 11 may be in the shape of a plate including an empty cavity 113, and may be provided with a recess 111 and an opening 112. The recess 111 may be used to install the frame 12 and the transmitting coil assembly, and the opening 112 may be used to install the shielding mesh reel 4. The transmitting coil assembly may be coaxially mounted to the frame 12 at the bottom inside the frame 12.

[0037] The frame 12 includes a plurality of inner support rods 121 and outer support rods 122 uniformly distributed in the circumferential direction, which are arranged parallel to the axis of the frame 12 and are used to support the metal shielding net 2 between the inner support rods 121 and the outer support rods 122. The bottom plate of the frame can be placed in the recess 111 of the substrate 11, and the top surface of the frame 12 can also be provided with a groove that cooperates with the receiving end, so that the docking with the receiving end is faster and more reliable. In some embodiments, four inner support rods 121 are arranged and four outer support rods 122 are arranged. On the one hand, this structure can well support the metal shielding net 2, and on the other hand, it can facilitate the storage capsule 3 to partially pass through the inner support rod when expanding to squeeze the metal shielding net 2. The frame 12 is provided with a circumferential slide 123 at the bottom between the inner support rod 121 and the outer support rod 122, and the slide 123 is used to receive the electromagnetic slider 7. However, the number of inner support rods and outer support rods can be different from this, and the number of the two can be different. The number of outer support rods can be more than the inner support rods, and the present invention does not make specific restrictions.

[0038] In an optional embodiment, to facilitate the processing of the frame 12, the frame 12 can be assembled from two parts, which are: a first subframe including a top plate and an outer support rod 122 inserted into the top plate; and a second subframe including a bottom plate and an inner support rod 121 inserted into the bottom plate. The bottom plate is placed in the recess 111 of the base plate 11 and is processed with a slideway 123. The bottom plate is also processed with a structure for accommodating the transmitting end coil assembly.

[0039] Combination Figure 5 The storage capsule 3 is annular, made of a flexible material with good elasticity, is deformable, and is coaxially connected to the frame 12 inside the frame 12, especially connected by a flange 31 protruding inward. The storage capsule 3 is used to surround the transmitting end coil 101 and the receiving end coil 201 inside the ring, fit with the two, and squeeze the metal shielding mesh 2 during the charging process.

[0040] The shielding net reel 4 is coaxially arranged with the frame 12 outside the frame 12 at the opening 112 on the substrate 11. The metal shielding net 2 is wound on the shielding net reel 4 and can be unfolded and retracted therefrom. When unfolding, the shielding net is continuously wound around the storage capsule 3 on the inner support rod 121 and the outer support rod 122, and the thickness of the shielding net increases until a predetermined thickness is reached. When retracting, the shielding net is unwound around the storage capsule 3, and the thickness of the shielding net decreases until the shielding net cannot be pulled. The metal shielding net 2 can be deformed under pressure to change its shape when squeezed by the storage capsule 3.

[0041] The electromagnetic slider 7 is installed in the slide 123, the pull rod 5 is arranged parallel to the inner support rod 121 and the outer support rod 122, one end of which is connected to the electromagnetic slider 7, and the starting section of the metal shielding net 2 is connected to the pull rod 5 to pull the metal shielding net 2 to move and wrap around the storage bag 2.

[0042] The electromagnetic guide rail 8 is annular and installed in the slide 123. When power is turned on, the electromagnetic slider 7 and the pull rod 5 can move along the electromagnetic guide rail 8 to pull the metal shielding net 2 to unfold and wind circumferentially between the inner support rod 121 and the outer support rod 122 to change the thickness. When the metal shielding net 2 reaches the required appropriate thickness, the electromagnetic guide rail 8 is de-energized.

[0043] The pump 6 is mounted on the substrate 11 and can be located in the cavity 113. It is used to fill the seawater into the storage capsule 3 after the metal shielding net 2 is wound to a predetermined thickness so that the storage capsule 3 is deformed and the metal shielding net 2 is squeezed to change the shape of the metal shielding net 2, and the filled seawater is discharged after the receiving end coil leaves so that the storage capsule 3 recovers its deformation. Therefore, during the underwater wireless charging process, the metal shielding net 2 can change its thickness and shape to achieve the best position with the best shielding effect, thereby serving as a solid barrier to isolate the potential impact of high-frequency discrete electric fields on other sensitive components inside the aircraft. This avoids the degradation or damage of component performance caused by electric field interference, ensures the stable operation of various systems of the aircraft, and improves its overall safety and reliability. In addition, the wrapping design of the metal shielding net for the receiving end coil and the transmitting end coil allows the electric field to be bound inside the coupler, greatly reducing the risk of the aircraft being detected by the outside world due to electrical radiation. This feature is particularly important for aircraft performing covert missions. It can effectively improve the concealment of the aircraft and ensure its safety in complex underwater environments.

[0044] In a preferred embodiment of the present invention, the metal shielding mesh device further comprises a shielding mesh retracting assembly 9 for automatically retracting the metal shielding mesh 2 and winding it onto the shielding mesh reel 4 .

[0045] In particular, refer to Figure 6 and Figure 7 The shielding net retracting assembly 9 includes a ratchet mechanism 91, an electromagnet 92 and a spring 93. The ratchet mechanism 91 includes a pawl 911 and a ratchet 912. The shielding net retracting assembly 9 can cooperate with the shielding net reel 4 to realize the deployment and automatic retraction of the metal shielding net 2. The deployment is triggered by energizing the electromagnetic guide rail 8, thereby causing the electromagnetic slider 7 and the pull rod 5 to move. The shielding net retracting assembly 9 can prevent the metal shielding net 2 from reversing and retract the metal shielding net 2.

[0046] The shielding mesh reel 4 includes a core shaft 41, a sleeve 42 and a cover plate 43. The core shaft 41 is connected to the substrate 11, and optionally connected to the substrate 11 through a protrusion protruding radially outward. The spring 93 and the sleeve 42 are sequentially sleeved on the core shaft 41, the spring 93 is closer to the substrate 11, one end of the spring 93 is fixedly connected to the core shaft 41, specifically the protrusion of the core shaft 41, and the other end is fixedly connected to the sleeve 42, and the sleeve 42 can rotate relative to the core shaft 41. The cover plate 43 is connected to the core shaft 41 at the end faces of the core shaft 41 and the sleeve 42, and can be connected by fasteners such as screws.

[0047] The electromagnet 92 and the ratchet 911 in the ratchet mechanism 91 are arranged on the cover plate 43. The ratchet 911 can be sleeved on a rotating shaft (not shown) fixed on the cover plate 43 and can rotate around the rotating shaft. The ratchet 912 in the ratchet mechanism 91 is arranged on the sleeve 42 and moves together with the sleeve 42. In particular, it can be an integral part of the sleeve 42. This arrangement structure can enhance the strength of the ratchet 912. When the electromagnet 92 is not energized, the ratchet 911 is stuck in the tooth groove of the ratchet 912 to prevent the ratchet 912 from reversing when the metal shielding net 2 is unfolded and causing the metal shielding net 2 to be retracted. In addition, when the metal shielding net 2 is unfolded and wound, the spring is compressed and deformed; when the electromagnet 92 is energized, it can attract the ratchet 911 to rotate around the rotating shaft and leave the ratchet 912. At this time, the ratchet 912 is no longer subjected to the force of the ratchet 911. The sleeve 42 can rotate relative to the core shaft 41 under the restoring force of the spring 93 to retract the metal shielding net 2. Therefore, the present invention utilizes a shielding net retracting assembly including a ratchet mechanism and a spring to realize automatic retraction of the shielding net with a simple structure, making the entire device compact, and the shielding net can be retracted by the restoring force of the spring only by energizing the electromagnet, and the operation is simple. However, those skilled in the art will understand that any other mechanism can be used to realize the deployment and retraction of the metal shielding net, and the present invention is not particularly limited to this.

[0048] Next, Figure 2 The working principle of the underwater electromagnetic coupler metal shielding net device provided by the present invention is explained with reference to the embodiments as examples.

[0049] Reference Figure 8When the UUV needs to be powered, it approaches the underwater wireless charging base station. When the base station receives a signal that the equipment is approaching, the shielding net device starts. When the receiving end is aligned with the transmitting end, the electromagnetic rail is energized, and the electromagnetic slider moves, driving the pull rod to pull the metal shielding net, and the metal shielding net is wound around the storage bag on the inner support rod until the predetermined appropriate thickness is reached. At this time, the pump is driven to fill the storage bag with seawater, change the shape of the storage bag, and the storage bag squeezes the metal shielding net. The metal shielding net changes its shape, and the detection achieves the best shielding effect. The base station starts to emit high-frequency alternating current, and transmits power to the UUV through the divergent magnetic field coupling of the transmitting end coil and the receiving end coil. After the energy transmission is completed, the UUV drives away, and the receiving end is separated from the shielding net device. Then the electromagnet can be energized, and the metal shielding net is automatically retracted. After completion, the device ends its work.

[0050] As described above, the underwater electromagnetic coupler metal shielding net device of the present invention can not only effectively block and attenuate the interference of the external electric field through a deformable storage bag and a metal shielding net with changeable thickness and changeable shape under the compression of the storage bag, but also can effectively confine the high-frequency discrete electric field generated by the coil during the charging process to the space between the couplers, effectively isolate the high-frequency discrete electric field generated by the coil, and prevent it from freely diffusing in the water outside the coil coupling area and forming eddy currents to cause charging system parameter fluctuations and energy loss, thereby improving the efficiency of underwater wireless charging, shortening the charging time of underwater equipment, and extending the operating time of the equipment underwater.

[0051] Finally, it should be noted that the features mentioned and / or shown in the above description of the exemplary embodiments of the present invention may be combined in the same or similar manner into one or more other embodiments, combined with the features in other embodiments or substituted for the corresponding features in other implementations. The technical solutions obtained by these combinations or substitutions shall also be deemed to be included in the protection scope of the present invention.

Claims

1. A metal shielding net device for an underwater electromagnetic coupler, characterized in that: It includes a shell, a metal shielding net, a storage capsule, a shielding net reel, a pull rod, a pump, an electromagnetic slider and an electromagnetic guide rail; The housing comprises a base plate and a cylindrical frame connected to each other, a transmitting end coil assembly comprising a transmitting end coil is coaxially mounted to the frame at the bottom inside the frame, the frame comprises a plurality of inner support rods and outer support rods uniformly distributed in the circumferential direction, for supporting the metal shielding net therebetween, and the frame is provided with a circumferential slideway at the bottom between the inner support rods and the outer support rods; The storage capsule is annular, deformable and coaxially connected to the frame in the frame, and is used to surround the transmitting end coil and the receiving end coil inside the ring, fit with the two, and press the metal shielding mesh during the charging process; The shielding mesh reel is coaxially arranged on the base plate outside the frame and with the frame, and the metal shielding mesh is wound on the shielding mesh reel and can be unfolded and retracted therefrom, and can be deformed under pressure; The pull rod is connected to the electromagnetic slider and the metal shielding net, the electromagnetic guide rail is annular and installed in the slideway, and can make the electromagnetic slider and the pull rod move along the electromagnetic guide rail when power is turned on, so as to pull the metal shielding net to unfold and circumferentially wind between the inner support rod and the outer support rod to change the thickness; The pump is installed on the substrate, and is used to fill seawater into the storage bag after the metal shielding net is wound to a predetermined thickness so that the storage bag is deformed and the metal shielding net is squeezed to change the shape of the metal shielding net, and to discharge the filled seawater after the receiving end coil leaves so that the storage bag can restore its deformation.

2. The underwater electromagnetic coupler metal shielding net device according to claim 1, characterized in that: It also includes a shielding net retracting assembly, which is used to automatically retract the metal shielding net and wind it around the shielding net reel.

3. The underwater electromagnetic coupler metal shielding net device according to claim 2, characterized in that: The shielding net retracting assembly includes a ratchet mechanism, an electromagnet and a spring, and the shielding net reel includes a core shaft, a sleeve and a cover plate; The core shaft is connected to the base plate, the spring and the sleeve are sequentially sleeved on the core shaft, two ends of the spring are respectively fixedly connected to the core shaft and the sleeve, the sleeve can rotate relative to the core shaft, and the cover plate is connected to the core shaft at the end surfaces of the core shaft and the sleeve; The electromagnet and the pawl in the ratchet mechanism are arranged on the cover plate, and the ratchet in the ratchet mechanism is arranged on the sleeve. When the electromagnet is not energized, the pawl is stuck in the tooth groove of the ratchet to prevent the ratchet from reversing when the metal shielding net is unfolded and retracting the metal shielding net. When the electromagnet is energized, the pawl is attracted to leave the ratchet, and the sleeve rotates relative to the core shaft under the restoring force of the spring to retract the metal shielding net.

4. The underwater electromagnetic coupler metal shielding net device according to claim 3, characterized in that: The ratchet is an integral part of the sleeve.

5. The underwater electromagnetic coupler metal shielding net device according to claim 1 or 2, characterized in that: The number of the inner support rods is four, and the number of the outer support rods is four.

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