Cylindrical electromagnetic transducer

Abstract

The invention discloses a cylindrical electromagnetic transducer. The cylindrical electromagnetic transducer comprises an outer shell and a vibrating tube fixed in the outer shell, the vibration tube comprises a cylindrical shell and a fixing rod penetrating through the cylindrical shell in the axial direction of the cylindrical shell, the two ends of the fixing rod are fixed to the inner wall of the outer shell, and the fixing rod is located in the cylindrical shell, wound with an electrified coil and coaxially provided with a magnetic field concentration mechanism. The magnetic field concentration structure comprises a plurality of supporting rods parallel to the fixing rod and a magnetic field concentrator, the supporting rods are arranged around the fixing rod to form an annular supporting frame, and the magnetic field concentrator is connected to the annular supporting frame in a sleeving mode. Compared with a traditional flat plate type electromagnetic transducer which has the problems of insufficient anti-pressure ability, incompact structure, low working efficiency and the like under the deep sea high pressure condition, the device provided by the invention has the advantages that the anti-pressure ability is higher, and the device is suitable for the detection environment under the deep sea high pressure.

Description

Technical Field

[0001] The present invention belongs to the field of deep - sea resource exploration, and particularly relates to a cylindrical electromagnetic transducer. Background Art

[0002] In the marine environment, sound waves are important tools for marine communication, detection, and monitoring, suitable for transmitting information and detecting targets. Traditional electromagnetic transducers all adopt flat - type coils to excite circular vibrating plates to achieve single - sided or double - sided radiation sound emission. When used in a high - purity water pressure environment, the vibration displacement of traditional flat - plate electromagnetic transducers will be greatly inhibited, thus reducing the sound source level.

[0003] Common flat - plate electromagnetic transducers have limited compressive capacity, making them prone to deformation and even damage in the deep - sea high - pressure environment, affecting their performance and reliability. In addition, in order to obtain a certain sound radiation area, the volume of flat - plate transducers is usually large, and the structural compactness is poor.

[0004] Patent document CN117805881A discloses a deep - water Boomer seismic source transducer and method. The transducer includes a base, a transmitting plate, a pressurized cavity, and a coil; a coil is arranged in a groove of the base; the edge of the transmitting plate is fixed to the base, the coil corresponds to the middle part of the transmitting plate, and when the coil is energized, an induced current is generated inside the transmitting plate, and the same - name magnetic fields are generated at the adjacent ends of the two, causing the transmitting plate to generate outward radiation; a seal is provided between the transmitting plate and the base to form a pressurized cavity in the depression of the transmitting plate, and a pressurizing port and a pressure - relief port communicating with the pressurized cavity are provided on the base, and the pressurizing port and the pressure - relief port are respectively connected to an external pressurizing pipeline and a pressure - relief pipeline; a first pressure sensor is arranged in the pressurized cavity, and a second pressure sensor is arranged outside the base.

[0005] Patent document CN112289290A discloses a membrane - type electromagnetic transducer, including a cylinder enclosing a watertight space, two membrane - type radiation members, and a seal; the membrane - type radiation member is formed by connecting a cylindrical part and a circular - ring part, and the height of the cylindrical part is greater than the height of the circular - ring part; a partition is fixedly arranged on the inner wall of the cylinder, and excitation structures wound with drive coils are fixedly arranged on both side surfaces of the partition. An armature is fixedly arranged on the end surface of the cylindrical part facing the partition, and the armature and the excitation structure in the same sub - space are arranged opposite to each other in the axial direction of the cylinder axis; the membrane - type electromagnetic transducer also includes K first fixing members (K≥3) for fixedly connecting the edge part of the membrane - type radiation member to the cylinder; a reinforcing member is arranged on the outer end surface of each membrane - type radiation member, and the reinforcing member is arranged in the radial direction of the outer end surface of the membrane - type radiation member and / or the reinforcing member is a symmetric structure centered on the center of the outer end surface of the membrane - type radiation member, and the reinforcing member is fixedly connected to the membrane - type radiation member or is an integral structure. Summary of the Invention

[0006] The object of the present invention is to provide a cylindrical electromagnetic transducer, which has stronger compressive resistance and is suitable for the detection environment under deep-sea high pressure compared with the traditional flat electromagnetic transducer, which has problems such as insufficient compressive resistance, non-compact structure and low working efficiency under deep-sea high-pressure conditions.

[0007] To achieve the object of the present invention, the following technical solutions are provided: a cylindrical electromagnetic transducer, comprising an outer housing and a vibration tube fixed within the outer housing; The vibration tube includes a cylindrical housing and a fixing rod axially penetrating the cylindrical housing. Both ends of the fixing rod are fixed to the inner wall of the outer housing. The fixing rod is located within the cylindrical housing and is wound with an energized coil and is coaxially provided with a magnetic field concentration mechanism. The magnetic field concentration structure includes a plurality of support rods arranged parallel to the fixing rod and a magnetic field concentrator. The plurality of support rods are arranged around the fixing rod to form an annular support frame, and the magnetic field concentrator is sleeved on the annular support frame.

[0008] The present invention uses a cylindrical spiral coil and a cylindrical vibration structure in cooperation to realize electromagnetic force driving the radial vibration of the cylinder to generate sound waves.

[0009] Specifically, the outer housing is made of a pressure-resistant and sound-transmitting material, which mainly has good sound wave conduction characteristics and compressive resistance.

[0010] Specifically, the outer housing is filled with a coupling acoustic impedance medium to match the acoustic impedance of the transducer, so as to ensure the effective transmission of sound waves.

[0011] Specifically, a hollow iron core tube is provided between the fixing rod and the energized coil, and the inner wall of the hollow iron core tube is sleeved and fixed to the outer peripheral surface of the fixing rod.

[0012] Specifically, insulating layers are provided on both the inner and outer surfaces of the cylindrical housing to prevent breakdown due to high-voltage discharge.

[0013] Specifically, the inner wall of the cylindrical housing is provided with grooves, and the length of the grooves is less than the axial length of the cylindrical housing to adjust its vibration mode and displacement amplitude and optimize the sound wave radiation effect.

[0014] Specifically, there are a plurality of the grooves, and the plurality of grooves are circumferentially arranged along the inner wall of the cylindrical housing, and a closed induced current loop is reserved along the circumference of the inner wall of the cylindrical housing to ensure that an effective induced current loop can still be formed in the case of various shaped slots, and to ensure the stability and efficiency of the transducer during operation.

[0015] Specifically, the fixing rod is provided with a pair of retaining rings for tightly pressing the energized coil to avoid the problem that the energized coil falls off due to vibration during the operation of the vibration tube.

[0016] Specifically, the vibration tube is further provided with a control unit and a power supply unit. The control unit generates corresponding control instructions according to the preset vibration frequency requirements, and the power supply unit supplies power to the energized coil according to the received control instructions.

[0017] Specifically, the magnetic field concentrator adopts an open-loop circular ring with a slit, and is in sliding contact with the annular support frame through the inner ring wall of the open-loop circular ring. The ratio of the length of the radial cross-section of the open-loop circular ring near the cylindrical shell to the length of the radial cross-section near the fixed rod is 1:4.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The cylindrical structure has stronger compressive resistance and can maintain stable performance under the deep-sea high-pressure environment, improving the reliability and service life of the device; Under the condition of maintaining the same radiation area, the cylindrical structure can be designed to be more compact, which is more convenient for integration and application in occasions with strict space requirements; Compared with the flat structure, the cylindrical structure has more uniform deformation and stress under the deep-sea high-pressure environment, so it can better adapt to the deep-sea environment and is more conducive to the manufacturing process of the corresponding pressure-resistant and sound-transmitting shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic half-sectional structure diagram of the cylindrical electromagnetic transducer provided in this embodiment; Figure 2 It is a schematic cross-sectional view of the vibration tube provided in this embodiment; Figure 3 It is a schematic structural diagram of the magnetic field concentration mechanism provided in this embodiment; Figure 4 It is a schematic structural diagram of the cylindrical shell provided in this embodiment; Figure 5 It is a schematic diagram of the magnetic field strength streamline and current density arrow cloud map provided in this embodiment; Figure 6 It is a distribution curve diagram of the magnetic induction intensity and current density along the axis of the vibration tube provided in this embodiment; In the figure, 1, energized coil; 2, cylindrical shell; 3, outer shell; 5, end cover; 6, magnetic field concentrator; 7, hollow iron core tube; 8, support rod; 9, rubber layer; 10, fixed rod; 11, retaining ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] As Figure 1 and Figure 2 shown, a cylindrical electromagnetic transducer provided in this embodiment includes a housing 3 and a vibration tube fixed inside the housing 3. In this embodiment, the housing 3 is designed in a cylindrical shape and made of a pressure-resistant and sound-transmitting material (such as carbon fiber composite material or glass fiber composite material), which has good sound wave conduction characteristics and compressive capacity. The inside of the housing 3 is filled with a coupling medium (such as seawater, insulating oil, or gel) to match the acoustic impedance of the transducer, thereby ensuring the effective transmission of sound waves, and both ends are sealed by end caps 5.

[0022] Compared with the traditional flat design, its cylindrical structure shows better stability in the deep-sea high-pressure environment, thereby improving the reliability and service life of the device. In addition, the cylindrical design is more compact when maintaining the same sound radiation area, adapting to application scenarios with limited space. At the same time, the force and deformation distribution under high-pressure environment are more uniform, which helps to adapt to the complex deep-sea environment and optimize the manufacturing process of the pressure-resistant and sound-transmitting housing.

[0023] More specifically, the vibration tube includes its cylindrical housing 2 and a fixing rod 10 axially penetrating the cylindrical housing 2 along the axis of the cylindrical housing 2. Both ends of the fixing rod 10 are fixed to the end cap 5 of the housing 3 to ensure that the vibration tube is fixed inside the housing 3.

[0024] An energized coil 1 is wound around the fixing rod 10 inside the cylindrical housing 2, and a magnetic field concentration mechanism is provided coaxially, such as Figure 3 shown as the structural schematic diagram of the magnetic field concentration mechanism. It includes several support rods 8 arranged parallel to the fixing rod 10 and a magnetic field concentrator 6. Several support rods 8 are arranged around the fixing rod 10 to form an annular support frame, and the magnetic field concentrator 6 is sleeved on the annular support frame.

[0025] The magnetic field concentrator 6 in this embodiment adopts a non-closed circular ring, and is in sliding contact with the annular bracket through the inner ring wall of the non-closed circular ring. More specifically, the ratio of the length of the radial cross section of the non-closed circular ring close to the cylindrical shell 2 to the length of the radial cross section close to the fixed rod 10 is 1:4, and the slit of the non-closed circular ring can form a current loop inside and outside the circular ring surface.

[0026] A pair of retaining rings 11 are provided on the fixing rod 10, and the retaining rings 11 can support the energized coil 1 wound on the fixing rod 10, so as to avoid the problem of the energized coil falling off due to vibration during the operation of the vibration tube.

[0027] In this embodiment, a plurality of magnetic field concentrators 6 are installed on the annular support frame, and the resonance position of the final vibration tube is adjusted by changing the spacing between the magnetic field concentrators.

[0028] In this embodiment, an iron core hollow tube 7 is provided between the fixing rod 10 and the energized coil 1 , and the inner tube wall of the iron core hollow tube 7 is sleeved and fixed to the outer circumference of the fixing rod 10 .

[0029] like Figure 4 As shown, the cylindrical shell 2 mentioned in this embodiment is provided with a groove inside, and the shape of the groove includes one of a circle, annular ring or strip, so as to adjust the vibration mode, displacement amplitude and equipment weight of the final vibration tube.

[0030] In addition, a plurality of grooves are provided in the cylindrical shell 2, but the length of the grooves is smaller than the axial length of the cylindrical shell 2, thereby ensuring that the cylindrical shell 2 retains a closed induction current loop along the circumferential direction, ensuring that an effective induction current loop can still be formed in the case of grooves of various shapes, thereby ensuring the stability and efficiency of the transducer during operation.

[0031] An insulating layer is provided between the cylindrical shell 2 and the energized coil 1 to prevent high voltage discharge breakdown. In addition, a rubber layer 9 may be coated on the outside of the cylindrical shell 2 to isolate the cylindrical shell 2 from the outer shell 3 .

[0032] The cylindrical shell 2 is in the shape of a hollow tube and is coaxial with the energized coil 1. Grooves of various shapes (such as circular, annular, and strip) can be provided on its surface to adjust its vibration mode and displacement amplitude and optimize the sound wave radiation effect.

[0033] The principle of the vibration tube provided in the above embodiment is as follows: when a pulse current or an alternating current is passed through the energized coil 1, an induced current will be generated inside the vibration tube according to Lenz's law. According to the Biot-Savart law, the magnetic induction intensity dB generated by the current element Idl in the coil at a certain point P in space is proportional to the magnitude of the current element Idl and inversely proportional to the square of the distance between the current element Idl and point P, so that the vibration plate is vibrated by the Lorentz force, thereby generating sound radiation.

[0034] That is, after the energized coil 1 is energized, a magnetic field will be formed, causing the vibration tube to vibrate under the action of the Lorentz force, thereby generating sound radiation. The magnetic field direction generated inside is coaxial with the vibration tube.

[0035] Such as Figure 5 shown, where Figure 5 in (a) is the magnetic field strength streamline and current density arrow cloud diagram without a magnetic field concentration mechanism. In the figure, (b) in 5 is the magnetic field strength streamline and current density arrow cloud diagram with one magnetic field concentrator, and (c) in 5 in the figure is the magnetic field strength streamline and current density arrow cloud diagram with three magnetic field concentrators.

[0036] From Figure 5 in (a), it can be seen that the magnetic field shapes on both sides are arc-shaped and there is basically no local strong magnetic field, which makes it impossible to achieve a large volume change in the final vibration tube during operation.

[0037] From Figure 5 in (b), it can be seen that local strong magnetic fields have initially formed on both sides, which in actual operation means that it can increase the force received by the vibration tube when it deforms, and at the same time can also achieve a large volume change.

[0038] From Figure 5 in (c), it can be seen that relatively complete local strong magnetic fields have formed on both sides, which in actual operation means that the vibration tube can achieve a large volume change, so as to adapt to a relatively wide range of resonant frequencies.

[0039] Such as Figure 6 shown, where Figure 6 in (a) is the distribution curve of the magnetic induction intensity along the axis of the vibration tube, Figure 6 in (b) is the distribution curve of the current density along the axis of the vibration tube.

[0040] From Figure 6 the two charts in, it can be seen that by adding a magnetic field concentrator, the magnetic induction intensity in a specific area can be effectively increased, and the current density in the specific area can be ensured to increase.

[0041] In summary, based on the above design, the present invention enables the magnetic field concentrator to move freely outside the energized coil, thereby realizing the adjustment of the resonant position. By changing the distance between the magnetic field concentrator and the energized coil, the resonant frequency can be affected. The magnetic field concentrator can be installed on the annular support frame to achieve precise adjustment of the resonant position. The annular support frame can be a linear support frame or a curved support frame, depending on the required adjustment range and accuracy. This design enables the transducer to adapt to different working environments and frequency requirements, improving its flexibility and reliability. In addition, the magnetic field concentrator can be designed with different shapes and sizes to adapt to different resonant frequencies and magnetic field intensities.

[0042] In addition, the terms "upper", "lower", "inner", "outer", "front", and "rear" are for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0043] Of course, the above are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

[0044] Finally, it should be noted that the above embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A cylindrical electromagnetic transducer, characterized in that: It includes an outer shell and a vibration tube fixed in the outer shell; The vibration tube includes a cylindrical shell and a fixing rod which penetrates the cylindrical shell axially, the two ends of the fixing rod are fixed to the inner wall of the outer shell, the fixing rod is located in the cylindrical shell and is wound with an energized coil and is coaxially provided with a magnetic field concentration mechanism, the magnetic field concentration structure includes a plurality of support rods arranged parallel to the fixing rod and a magnetic field concentrator, the plurality of support rods are arranged around the fixing rod to form an annular support frame, and the magnetic field concentrator is sleeved on the annular support frame.

2. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The outer shell is made of pressure-resistant sound-transmitting material.

3. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The outer shell is filled with a coupling acoustic impedance medium.

4. The cylindrical electromagnetic transducer according to claim 1, characterized in that: There are a plurality of magnetic field concentrators, which are arranged at intervals along the axial direction of the hollow tube of the iron core.

5. The cylindrical electromagnetic transducer according to claim 1, characterized in that: An iron core hollow tube is arranged between the fixing rod and the energized coil, and the inner tube wall of the iron core hollow tube is sleeved and fixed to the outer peripheral surface of the fixing rod.

6. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The inner wall of the cylindrical shell is provided with a groove, and the length of the groove is smaller than the axial length of the cylindrical shell.

7. The cylindrical electromagnetic transducer according to claim 6, characterized in that: There are a plurality of grooves, and the plurality of grooves are arranged along the circumference of the inner wall of the cylindrical shell, and the inner wall of the cylindrical shell retains a closed induction current loop along the circumference.

8. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The fixing rod is provided with a pair of retaining rings for tightening the energized coil.

9. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The vibration tube is also provided with a control unit and a power supply unit. The control unit generates corresponding control instructions according to the preset vibration frequency requirements, and the power supply unit supplies power to the energized coil according to the received control instructions.

10. The cylindrical electromagnetic transducer according to claim 1, characterized in that: The magnetic field concentrator adopts a non-closed-loop circular ring with a slit, and is in sliding contact with the annular support frame through the inner ring wall of the non-closed-loop circular ring. The ratio of the length of the radial cross section of the non-closed-loop circular ring close to the cylindrical shell to the length of the radial cross section close to the fixed rod is 1:4.

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