An underwater electromagnetic coupler metal shielding net device

Abstract

This invention provides a metal shielding mesh device for an underwater electromagnetic coupler. The frame includes multiple inner and outer support rods supporting the metal shielding mesh. During charging, a reservoir within the frame surrounds, adheres to, and compresses the transmitting and receiving coils. The shielding mesh is wound on a reel and can be unwound and retracted. When energized, an electromagnetic guide rail in the frame's slide rail causes a slider and pull rod to move along the rail, pulling the shielding mesh circumferentially and changing its thickness. A pump fills the reservoir with seawater, causing it to deform and compress the shielding mesh, thus changing its shape. This invention, through a deformable reservoir and a metal shielding mesh with variable thickness that can change shape under reservoir compression, not only effectively blocks and attenuates interference from external electric fields but also effectively confines the high-frequency discrete electric field generated by the coils within the space between the couplers, effectively isolating the high-frequency discrete electric field generated by the coils and improving the efficiency of underwater wireless charging.

Description

Technical Field

[0001] This invention belongs to the field of underwater electromagnetic coupler electric field shielding technology, specifically relating to an underwater electromagnetic coupler metal shielding mesh device. Background Technology

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

[0003] During the wireless power transmission process of underwater equipment, the coupler is subject to interference from the external electric field. On the other hand, a high-frequency discrete electric field is generated outside the coil coupling area, which will spread freely in the water and form eddy currents. The eddy current effect will cause fluctuations in the charging system parameters and energy loss, thus reducing the power transmission efficiency.

[0004] Metal shielding mesh, as an important component of electromagnetic couplers, primarily functions to block and attenuate interference from external electric fields through its topological shape and material properties, while ensuring the stable transmission of the internal electric field. In underwater environments, due to the conductivity of seawater, the propagation and attenuation characteristics of the electric field differ significantly from those in air, requiring the design of the metal shielding mesh to fully consider this characteristic.

[0005] Traditional metal shielding meshes often employ simple planar or grid-like structures. While they can block external electric field interference to some extent, their effectiveness is often limited in complex and variable underwater environments. They cannot completely prevent the penetration of external electric fields, nor can they prevent internal electric fields from scattering outside the coupling area of ​​the coupler. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of low charging efficiency caused by the inability of existing underwater electromagnetic couplers to block external electric fields through metal shielding mesh and the generation of high-frequency discrete electric fields outside the coupling area. This invention provides a metal shielding mesh device for underwater electromagnetic couplers. This device can change the thickness and shape of the metal shielding layer. Specifically, an electromagnetic slider and electromagnetic rail cause a pull rod to continuously wind the metal shielding mesh around a reservoir, thus changing its thickness. Seawater is then pumped into the reservoir, changing its shape. The deformation of the reservoir further alters the shape of the metal shielding mesh, achieving optimal electric field shielding.

[0007] To achieve the above objectives, the technical solution provided by this invention is:

[0008] An underwater electromagnetic coupler metal shielding device includes a shell, a metal shielding mesh, a reservoir, a shielding mesh 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 transmitter coil assembly, including a transmitter coil, is coaxially mounted to the frame at the bottom inside the frame. The frame includes a plurality of circumferentially distributed inner support rods and outer support rods for supporting a metal shielding mesh therebetween. A circumferential slide is provided at the bottom between the inner support rods and the outer support rods of the frame.

[0010] The reservoir is ring-shaped, deformable, and coaxially connected to the frame within the frame. It is used to surround, fit against, and compress the metal shielding mesh inside the ring during charging.

[0011] The shielding mesh roll is coaxially mounted on the base plate outside the frame. The metal shielding mesh is wound around the shielding mesh roll and can be unwound and retracted from it, and can be deformed under pressure.

[0012] The pull rod is connected to the electromagnetic slider and the metal shielding mesh. The electromagnetic guide rail is circular and installed in the slide rail. When energized, the electromagnetic slider and pull rod can move along the electromagnetic guide rail to pull the metal shielding mesh to unfold and circumferentially roll between the inner support rod and the outer support rod, thereby changing the thickness.

[0013] The pump is mounted on the base plate to fill the reservoir with seawater after the metal shielding mesh is wound to a predetermined thickness, so that the reservoir deforms and squeezes the metal shielding mesh to change its shape, and to discharge the filled seawater after the receiving coil leaves so that the reservoir returns to its original shape.

[0014] Furthermore, the metal shielding mesh device also includes a shielding mesh retraction assembly for automatically retracting the metal shielding mesh and winding it onto the shielding mesh reel.

[0015] Furthermore, the shielding mesh retraction assembly includes a ratchet mechanism, an electromagnet, and a spring. The shielding mesh reel includes a spindle, a sleeve, and a cover plate. The spindle is connected to a base plate, and the spring and sleeve are sequentially sleeved on the spindle. The two ends of the spring are fixedly connected to the spindle and the sleeve, respectively. The sleeve can rotate relative to the spindle. The cover plate is connected to the spindle at the end faces of the spindle and the sleeve. The pawl in the electromagnet and ratchet mechanism is set on the cover plate, and the ratchet in the ratchet mechanism is set on the sleeve. When the electromagnet is not energized, the pawl engages in the tooth groove of the ratchet to prevent the ratchet from reversing and causing the metal shielding mesh to retract when it is unfolded. When the electromagnet is energized, it attracts the pawl away from the ratchet, and the sleeve rotates relative to the spindle under the restoring force of the spring to retract the metal shielding mesh.

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

[0017] Furthermore, there are four inner support rods and four outer support rods.

[0018] The advantages of this invention are:

[0019] 1. The underwater electromagnetic coupler metal shielding mesh device of the present invention provides an annular deformable reservoir and a metal shielding mesh that can be wound around the reservoir 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 mesh is wound by an electromagnetic slider and an electromagnetic rail. When a suitable thickness is reached, seawater is filled into the reservoir and deforms and expands, which can surround the receiving end coil and the transmitting end coil inside the ring. The inner wall of the reservoir is in contact with the two coils, while the outer wall of the reservoir squeezes the metal shielding mesh to adjust the shape of the shielding mesh, thereby achieving the best electric field shielding effect. Therefore, this invention, through a deformable reservoir and a metal shielding mesh with variable thickness that can change shape under the compression of the reservoir, can not only effectively block and attenuate interference from external electric fields, but also effectively confine the high-frequency discrete electric field generated by the coil during charging within the space between the couplers. This effectively isolates the high-frequency discrete electric field generated by the coil, preventing it from freely diffusing in the water outside the coil coupling area and forming eddies that would cause fluctuations in charging system parameters and energy loss. This improves the efficiency of underwater wireless charging, shortens the charging time of underwater equipment, and extends the operating time of the equipment underwater.

[0020] 2. During underwater wireless charging, the metal shielding mesh acts as a robust barrier, isolating the potential impact of high-frequency discrete electric fields on other sensitive components inside the vessel. This prevents component performance degradation or damage caused by electric field interference, ensuring the stable operation of all systems within the vessel and improving its overall safety and reliability.

[0021] 3. The metal shielding mesh surrounding the receiver and transmitter coils confines the electric field within the coupler, significantly reducing the risk of the vehicle being detected by external forces due to electromagnetic radiation. This feature is particularly important for vehicles performing stealth missions, effectively enhancing their stealth capabilities and ensuring their safety in complex underwater environments.

[0022] 4. The shielding mesh retraction assembly, which includes a ratchet mechanism and a spring, achieves automatic retraction of the shielding mesh with a simple structure. This makes the entire device compact. The shielding mesh can be retracted by simply energizing the electromagnet and using the restoring force of the spring, making it easy to operate. Attached Figure Description

[0023] The above and / or other features and advantages of the present invention will become more readily understood from the following description with reference to the accompanying drawings, which are not drawn to scale and some features are enlarged or reduced to show details of specific parts.

[0024] Figure 1 This is a schematic perspective view of the underwater electromagnetic coupler metal shielding mesh device of the present invention;

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

[0026] Figure 3 This is a schematic perspective view of the substrate in the housing of the present invention;

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

[0028] Figure 5 This is a schematic perspective view of the reservoir in this invention;

[0029] Figure 6 This is a schematic perspective view of the shielding mesh retraction component in this invention;

[0030] Figure 7 This is a cross-sectional view of the shielding mesh retraction component in this invention;

[0031] Figure 8 This is a flowchart illustrating the operation of the underwater electromagnetic coupler metal shielding mesh device of the present invention.

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

[0033] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention.

[0034] This invention provides a metal shielding mesh device for an underwater electromagnetic coupler, which can be connected to an underwater wireless charging base station to interface with underwater equipment such as UUVs that require power replenishment, thereby enabling wireless charging. The receiving coil assembly is mounted on the underwater equipment, and the transmitting coil assembly is mounted on the shielding mesh device. When the UUV needs power replenishment, the two components interface to achieve wireless power transmission. The shielding mesh device of this invention effectively confines the high-frequency discrete electric field generated by the coils during the charging process of the underwater electromagnetic coupler within the space between the couplers. This effectively isolates the high-frequency discrete electric field generated by the coils, preventing it from freely diffusing in the water outside the coil coupling area and forming eddy currents, which would 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 An underwater electromagnetic coupler metal shielding device, as an exemplary embodiment of the present invention, includes a housing 1, a metal shielding mesh 2, a reservoir 3, a shielding mesh reel 4, a pull rod 5, a pump 6, an electromagnetic slider 7, and an electromagnetic guide rail 8. The housing 1 supports the metal shielding mesh device, connects it to a base station, and houses the transmitting coil assembly, which may include a transmitting magnetic core 100 and a transmitting coil 101 laid thereon. Correspondingly, the receiving coil assembly may include a receiving magnetic core 200 and a receiving coil 201 laid thereon. The reservoir 3 is used to align with the receiving coil 201 during charging, and during charging, it is in contact with the transmitting coil 101 and the receiving coil 201 at both ends, respectively. The metal shielding mesh 2 is wound around the shielding mesh reel 4, can be unwound and retracted from it, and is wound multiple times around the reservoir 3 during unwound operation. The pull rod 5, the electromagnetic slider 7, and the electromagnetic guide rail 8 are used together to realize the movement of the metal shielding mesh 2 around the reservoir 3. Pump 6 can pump media such as seawater into the reservoir 3 to expand and deform it, and can also discharge seawater from the reservoir 3 to restore its shape. When the reservoir 3 expands, it can compress the surrounding metal shielding mesh 2, causing it to change shape and achieve optimal shielding. This effectively blocks and attenuates interference from external electric fields, and effectively confines the high-frequency discrete electric field generated by the coil during charging within the space between the couplers, effectively isolating the high-frequency discrete electric field generated by the coil. It should be noted that the optimal thickness and shape of the metal shielding mesh 2 can be determined by measuring the electric field strength, specifically by directly measuring the electric field strength in the space using an electric field strength meter (electric field meter). When electric field leakage occurs, the electric field strength near the leakage point will change; measuring these changes can determine whether electric field leakage exists.

[0036] The housing 1 includes a base plate 11 and a cylindrical frame 12 connected to each other, combined Figure 3 and Figure 4The substrate 11 may be plate-shaped, including a hollow cavity 113, and has a recess 111 and an opening 112. The recess 111 can be used to mount the frame 12 and the transmitter coil assembly, and the opening 112 can be used to mount the shielding mesh roll 4. The transmitter coil assembly can be coaxially mounted to the frame 12 at the bottom inside the frame 12.

[0037] The frame 12 includes a plurality of circumferentially distributed inner support rods 121 and outer support rods 122, which are arranged parallel to the axis of the frame 12 and are used to support the metal shielding mesh 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 base plate 11, and the top surface of the frame 12 can also be provided with a groove that mates with the receiving end, so as to make the docking with the receiving end faster and more reliable. In some embodiments, four inner support rods 121 and four outer support rods 122 are arranged. This structure can provide good support for the metal shielding mesh 2 on the one hand, and facilitate the storage bag 3 to partially pass through the inner support rods during expansion to compress the metal shielding mesh 2 on the other hand. A circumferential slide 123 is provided at the bottom between the inner support rods 121 and the outer support rods 122 of the frame 12, 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, and the number of outer support rods can be more than the number of inner support rods. The present invention does not impose a specific limitation.

[0038] In an optional embodiment, to facilitate the fabrication of the frame 12, the frame 12 can be assembled from two components: a first sub-frame including a top plate and an outer support rod 122 inserted into the top plate; and a second sub-frame 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 substrate 11 and is provided with a slide rail 123. The bottom plate is also provided with a structure for accommodating the transmitting coil assembly.

[0039] Combination Figure 5 The reservoir 3 is annular, made of a flexible material with good elasticity, and deformable. It is coaxially connected to the frame 12 within the frame 12, specifically by an inwardly projecting flange 31. The reservoir 3 is used to surround, adhere to, and compress the metal shielding mesh 2 within the ring during charging.

[0040] The shielding mesh reel 4 is coaxially disposed with the frame 12 at the opening 112 on the base plate 11 outside the frame 12. The metal shielding mesh 2 is wound around the shielding mesh reel 4 and can be unwound and retracted from it. When unwound, it continuously winds around the reservoir 3 on the inner support rod 121 and the outer support rod 122, and the thickness of the shielding mesh increases until it reaches a predetermined thickness. When retracted, it unwinds around the reservoir 3, and the thickness of the shielding mesh decreases until it can no longer be pulled. The metal shielding mesh 2 can be deformed under pressure to change its shape when squeezed by the reservoir 3.

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

[0042] The electromagnetic guide rail 8 is ring-shaped and installed in the slide rail 123. When energized, the electromagnetic slider 7 and the pull rod 5 can move along the electromagnetic guide rail 8 to pull the metal shielding mesh 2 to unfold and circumferentially roll between the inner support rod 121 and the outer support rod 122, thereby changing the thickness. When the metal shielding mesh 2 reaches the required suitable thickness, the electromagnetic guide rail 8 is de-energized.

[0043] Pump 6 is mounted to base plate 11 and can be located within cavity 113. It is used to fill the reservoir 3 with seawater after the metal shielding mesh 2 has been wound to a predetermined thickness, causing the reservoir 3 to deform and compress the metal shielding mesh 2, thus changing its shape. After the receiving coil is removed, the pumped seawater is discharged, allowing the reservoir 3 to return to its original shape. Therefore, during underwater wireless charging, the metal shielding mesh 2 can change its thickness and shape to achieve the optimal position for best shielding, thus acting as a solid barrier to isolate the potential impact of high-frequency discrete electric fields on other sensitive components inside the vehicle. This avoids component performance degradation or damage caused by electric field interference, ensuring the stable operation of various systems within the vehicle and improving its overall safety and reliability. Furthermore, the design of the metal shielding mesh wrapping around the receiving and transmitting coils confines the electric field within the coupler, greatly reducing the risk of the vehicle being detected by the outside world due to electric radiation. This characteristic is particularly important for vehicles performing stealth missions, effectively enhancing their stealth capabilities and ensuring their safety in complex underwater environments.

[0044] In a preferred embodiment of the present invention, the metal shielding mesh device further includes a shielding mesh retraction component 9, which is used to automatically retract the metal shielding mesh 2 and wind it onto the shielding mesh roll 4.

[0045] Specifically, refer to Figure 6 and Figure 7 The shielding mesh retraction 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 mesh retraction assembly 9 can cooperate with the shielding mesh reel 4 to realize the unfolding and automatic retraction of the metal shielding mesh 2. Its unfolding is triggered by energizing the electromagnetic guide rail 8, which in turn causes the electromagnetic slider 7 and the pull rod 5 to move. The shielding mesh retraction assembly 9 can prevent the metal shielding mesh 2 from reversing and thus retract the metal shielding mesh 2.

[0046] The shielding mesh reel 4 includes a spindle 41, a sleeve 42, and a cover plate 43. The spindle 41 is connected to the base plate 11, optionally via a radially outwardly protruding portion. A spring 93 and a sleeve 42 are sequentially sleeved on the spindle 41, with the spring 93 closer to the base plate 11. One end of the spring 93 is fixedly connected to the spindle 41, specifically the protruding portion of the spindle 41, and the other end is fixedly connected to the sleeve 42. The sleeve 42 is rotatable relative to the spindle 41. The cover plate 43 is connected to the spindle 41 at the end faces of the spindle 41 and the sleeve 42, and can be connected by fasteners such as screws.

[0047] The pawl 911 in the electromagnet 92 and ratchet mechanism 91 is mounted on the cover plate 43. The pawl 911 can be sleeved on the rotating shaft (not shown in the figure) fixed on the cover plate 43 and can rotate around the rotating shaft. The ratchet 912 in the ratchet mechanism 91 is mounted 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 can enhance the strength of the ratchet 912. When the electromagnet 92 is not energized, the pawl 911 is engaged in the tooth groove of the ratchet 912 to prevent the ratchet 912 from reversing and causing the metal shielding mesh 2 to retract when it is unfolded. In addition, when the metal shielding mesh 2 is unfolded and rolled up, the spring is compressed and deformed. When the electromagnet 92 is energized, it can attract the pawl 911 to rotate around the rotating shaft and move away from the ratchet 912. At this time, the ratchet 912 is no longer subjected to the force of the pawl 911, and the sleeve 42 can rotate relative to the spindle 41 under the restoring force of the spring 93 to retract the metal shielding mesh 2. Therefore, this invention utilizes a shielding mesh retraction assembly including a ratchet mechanism and a spring to achieve automatic retraction of the shielding mesh with a simple structure. This makes the entire device compact, requiring only the application of electricity to the electromagnet to retract the shielding mesh through the restoring force of the spring, making operation simple. However, those skilled in the art will understand that any other mechanism can be used to achieve the unfolding and retraction of the metal shielding mesh, and this invention is not particularly limited in this regard.

[0048] Next Figure 2 The following embodiments are provided as examples to illustrate the working principle of the underwater electromagnetic coupler metal shielding mesh device provided by the present invention.

[0049] Reference Figure 8When the UUV needs recharging, it approaches the underwater wireless charging base station. Upon receiving the signal of approach, the base station activates the shielding device. When the receiver and transmitter are axially aligned, the electromagnetic rail is energized, causing the electromagnetic slider to move and pull the metal shielding mesh around the reservoir on the inner support rod until the desired thickness is achieved. At this point, the pump is activated to fill the reservoir with seawater, changing its shape. The reservoir compresses the metal shielding mesh, causing it to reshape. Once optimal shielding is achieved, the base station emits high-frequency alternating current, transmitting power to the UUV through the magnetic coupling of the transmitting and receiving coils. After power transmission, the UUV departs, and the receiver detaches from the shielding device. Then, the electromagnet can be energized, and the metal shielding mesh automatically retracts. The device then ceases operation.

[0050] As described above, the underwater electromagnetic coupler metal shielding device of the present invention, through a deformable reservoir and a metal shielding mesh with variable thickness that can change shape under the compression of the reservoir, can not only effectively block and attenuate the interference of external electric fields, but also effectively confine the high-frequency discrete electric field generated by the coil during charging within the space between the couplers. This effectively isolates the high-frequency discrete electric field generated by the coil, preventing it from freely diffusing in the water outside the coil coupling area and forming eddy currents, thus causing fluctuations in charging system parameters and energy loss. This improves the efficiency of underwater wireless charging, shortens the charging time of underwater equipment, and extends 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 exemplary embodiments of the present invention can be combined in the same or similar manner with one or more other embodiments, combined with features in other embodiments, or substituted for corresponding features in other embodiments. These combined or substituted technical solutions should also be considered to be included within the scope of protection of the present invention.

Claims

1. A metal shielding mesh device for an underwater electromagnetic coupler, characterized in that: It includes a housing, a metal shielding mesh, a reservoir, a shielding mesh reel, a tie rod, a pump, an electromagnetic slider, and an electromagnetic rail. The housing includes a base plate and a cylindrical frame connected to each other. A transmitter coil assembly including a transmitter coil is coaxially mounted to the frame at the bottom of the frame. The frame includes a plurality of circumferentially distributed inner support rods and outer support rods for supporting the metal shielding mesh between the inner support rods and the outer support rods. A circumferential slide is provided at the bottom of the frame between the inner support rods and the outer support rods. The reservoir is annular, deformable, and coaxially connected to the frame within the frame, used to surround the transmitting coil and the receiving coil inside the ring during charging, to fit against the transmitting coil and the receiving coil, and to compress the metal shielding mesh. The shielding mesh roll is coaxially disposed on the base plate outside the frame and the frame. The metal shielding mesh is wound around the shielding mesh roll and can be unwound and retracted from the shielding mesh roll, and can be deformed under pressure. The pull rod is connected to the electromagnetic slider and the metal shielding mesh. The electromagnetic guide rail is circular and installed in the circumferential slide rail. When energized, the electromagnetic slider and the pull rod can move along the electromagnetic guide rail to pull the metal shielding mesh to unfold and circumferentially roll between the inner support rod and the outer support rod, thereby changing the thickness of the metal shielding mesh. The pump is installed on the substrate and is used to fill the reservoir with seawater after the metal shielding mesh is wound to a predetermined thickness, so that the reservoir deforms and squeezes the metal shielding mesh to change its shape, and to discharge the filled seawater after the receiving coil leaves, so that the reservoir returns to its original shape.

2. The underwater electromagnetic coupler metal shielding mesh device according to claim 1, characterized in that: It also includes a shielding mesh retraction assembly for automatically retracting the metal shielding mesh and winding it onto the shielding mesh reel.

3. The underwater electromagnetic coupler metal shielding mesh device according to claim 2, characterized in that: The shielding mesh retraction assembly includes a ratchet mechanism, an electromagnet, and a spring; the shielding mesh reel includes a spindle, a sleeve, and a cover plate. The mandrel is connected to the substrate, the spring and the sleeve are sequentially sleeved on the mandrel, the two ends of the spring are respectively fixed to the mandrel and the sleeve, the sleeve is rotatable relative to the mandrel, and the cover plate is connected to the mandrel at the end face of the mandrel and the sleeve. The electromagnet and the pawl in the ratchet mechanism are disposed on the cover plate, and the ratchet in the ratchet mechanism is disposed on the sleeve. When the electromagnet is not energized, the pawl is engaged in the tooth groove of the ratchet to prevent the ratchet from reversing and causing the metal shielding mesh to retract when the metal shielding mesh is unfolded. When the electromagnet is energized, it attracts the pawl away from the ratchet, and the sleeve rotates relative to the spindle under the restoring force of the spring to retract the metal shielding mesh.

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

5. The underwater electromagnetic coupler metal shielding mesh device according to claim 1 or 2, characterized in that: There are four inner support rods and four outer support rods.

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