A new type of marine electromagnetic controllable source device

Abstract

The present invention belongs to the technical field of marine seismic exploration equipment and relates to a novel marine electromagnetic controllable vibrator device, comprising: an outer cylinder, two air gap magnetic field assemblies symmetrically arranged within the outer cylinder, and two motion assemblies connected to the ends of the outer cylinder; the air gap magnetic field assembly comprises a bottom magnetic yoke, an outer magnetic yoke, an inner magnetic yoke, a first permanent magnet and a second permanent magnet connected to the ends of the inner magnetic yoke, the first permanent magnet and the second permanent magnet being both axially magnetized but in opposite directions; the motion assembly comprises a vibration radiation plate, a sealing ring, and a coil skeleton, the inner ring of the sealing ring being sealedly connected to the vibration radiation plate, and the outer ring being sealedly connected to the outer cylinder; one end of the coil skeleton being connected to the vibration radiation plate and the other end being inserted into the air gap; the drive coils on the two coil skeletons being connected in series but in opposite winding directions. The present invention utilizes electromagnetic drive to synchronously and oppositely vibrate the two vibration radiation plates, achieving high-energy dynamic pressure excitation of the marine electromagnetic controllable vibrator, thereby overcoming the shortcomings of traditional airgun seismic sources.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine seismic exploration equipment, and in particular relates to a novel marine electromagnetic controllable vibrator device. Background Art

[0002] Oil and natural gas are important strategic resources, crucial not only to the development of the national economy but also to national energy security. As the difficulty and cost of extracting onshore oil and gas resources increase, exploration and production are gradually shifting to the ocean. Seismic methods are the primary method for offshore oil and gas exploration. Using artificial seismic sources to generate seismic waves, exploration not only determines underground structural features and fault distribution, but also provides insights into stratum lithology, reservoir thickness, and other parameters. In marine seismic exploration, the seismic source is the key device for generating these waves, directly impacting the effectiveness of exploration.

[0003] At present, airguns are the main artificial seismic sources commonly used in marine seismic exploration. The basic principle of airgun seismic sources is to stimulate sharp waveforms of dynamic pressure in the water through the instantaneous release of high-pressure gas. However, due to the large instantaneous excitation of high energy, airgun seismic sources have many shortcomings in low-frequency information, energy utilization, signal fidelity and environmental intrusion, and airgun excitation is prone to interfere with the behavior of marine organisms. Summary of the Invention

[0004] In response to the shortcomings of related technologies, the present invention provides a new marine electromagnetic controllable source device, aiming to provide a new source device for marine seismic exploration, so as to solve the shortcomings of traditional air gun sources in marine seismic exploration and realize green and efficient marine seismic exploration.

[0005] The present invention provides a novel marine electromagnetic controllable vibroseis device, comprising:

[0006] The outer cylinder includes a cylinder body and a support plate; the cylinder body is cylindrical with both ends open, and the support plate is connected to the cylinder body and is located in the middle of the cylinder body in the axial direction to divide the inner cavity of the cylinder body into two accommodating cavities;

[0007] Two air gap magnetic field assemblies are respectively arranged in the two accommodating cavities; each air gap magnetic field assembly includes a bottom magnetic yoke, an outer magnetic yoke, an inner magnetic yoke, a first permanent magnet and a second permanent magnet arranged coaxially with the barrel, the axial ends of the inner magnetic yoke are respectively connected to the first permanent magnet and the second permanent magnet, the first permanent magnet and the second permanent magnet are both axially magnetized but in opposite directions, the outer magnetic yoke is sleeved on the outside of the inner magnetic yoke, the first permanent magnet and the second permanent magnet to form an air gap, one end of the bottom magnetic yoke is connected to the support plate, and the other end is connected to the outer magnetic yoke and the second permanent magnet;

[0008] Two motion components are respectively arranged at the two end openings of the barrel; each motion component includes a vibration radiation plate, a sealing ring, and a coil frame arranged coaxially with the barrel, the inner ring of the sealing ring is sealed to the vibration radiation plate, and the outer ring of the sealing ring is sealed to the open end of the barrel; the coil frame includes a base plate and a barrel wall protruding from one side of the base plate, the base plate is connected to the vibration radiation plate, the barrel wall is inserted into the air gap, and a drive coil is wound on the barrel wall; the two drive coils of the two motion components are connected in series but have opposite winding directions;

[0009] When the two driving coils are connected to alternating current, the two coil frames drive the two vibration radiation plates to vibrate synchronously in opposite directions under the action of electromagnetic force, thereby stimulating dynamic pressure in the water area.

[0010] In some embodiments, an axially extending inner channel is provided at the center of the inner magnetic yoke, the first permanent magnet, the second permanent magnet and the bottom magnetic yoke in each air gap magnetic field assembly; a guide assembly is provided between the support plate and each vibration radiation plate, and the guide assembly includes a guide sleeve and a guide shaft coaxially arranged with the cylinder body; the guide sleeve is connected to the support plate and passed through the inner channel; one end of the guide shaft is connected to the vibration radiation plate, and the other end passes through the base plate and is inserted into the guide sleeve, and a linear bearing compatible with the guide shaft is embedded in the guide sleeve.

[0011] In some embodiments, a plurality of limit assemblies are provided between the support plate and the seat plate of each coil frame. The plurality of limit assemblies are arranged at intervals around the center of the seat plate and are located between the inner channel and the guide sleeve. Each limit assembly includes a support column and a limit spring. One end of the support column is connected to the seat plate, and the other end extends toward the support plate. The limit spring is clamped between the support column and the support plate.

[0012] In some embodiments, each motion component further includes a connecting seat, one end of which is connected to the vibration radiation plate, and the other end is connected to the seat plate of the coil frame; an avoidance hole is opened through the connecting seat, and the guide shaft passes through the avoidance hole.

[0013] In some embodiments, an acceleration sensor is provided on the side of the vibration radiation plate close to the accommodating cavity; a support plate is protruding from the inner wall of the cylinder close to the opening end, and a displacement sensor is installed on the support plate, and the probe of the displacement sensor is in contact with the vibration radiation plate.

[0014] In some embodiments, two external interfaces are provided on the side wall of the barrel, and the two external interfaces are respectively connected to the two accommodating chambers; a plurality of through holes are provided on the support plate to connect the two accommodating chambers; each external interface is sealed with an interface cover plate, and the interface cover plate is provided with a plurality of watertight interfaces, including a power supply interface for providing alternating current to the driving coil, a signal transmission interface for transmitting monitoring information of the acceleration sensor and the displacement sensor, and an air pressure interface for adjusting the pressure of the accommodating chamber.

[0015] In some embodiments, the sealing ring includes a first mounting portion located at the outer ring, a second mounting portion located at the inner ring, and a flexible portion connected between the first mounting portion and the second mounting portion; the open end of the cylinder body is provided with an outward-folded flange, and the first mounting portion is sealed to the flange of the cylinder body through an outer pressure ring; the second mounting portion is sealed to the end of the vibration radiation plate facing the cylinder body through an inner pressure ring; the flexible portion has the ability to deform with the vibration of the vibration radiation plate.

[0016] In some embodiments, a plurality of axially extending slots are formed in a circumferential direction of the cylindrical wall of each coil bobbin.

[0017] In some embodiments, two stirrups are protruded along the axial direction on the outer wall of the cylinder of each coil skeleton, and the driving coil is wound on the cylinder wall between the two stirrups; insulating paper is pasted on the cylinder wall between the two stirrups.

[0018] In some embodiments, the barrel includes two sub-barrels arranged along its axial direction, and the two sub-barrels are sealed and connected to each other; the support plate includes two support plates, which are respectively connected to the two sub-barrels and close to one end where the two sub-barrels are connected to each other.

[0019] Based on the above technical solution, the new marine electromagnetic controllable source device in the embodiment of the present invention, through the design of double air gap magnetic field components and double motion components, can use electromagnetic drive to synchronize and reversely vibrate two symmetrically arranged vibration radiation plates, thereby realizing large-energy dynamic pressure excitation of the marine electromagnetic controllable source, providing a new source device based on electromagnetic drive for marine seismic exploration, and solving the shortcomings of traditional air gun sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 This is an overall schematic diagram of the novel marine electromagnetic vibroseis device of the present invention;

[0022] Figure 2 A cross-sectional view of the novel marine electromagnetic vibroseis device of the present invention;

[0023] Figure 3 This is a partial exploded view of the novel marine electromagnetic vibroseis device of the present invention;

[0024] Figure 4 Schematic diagram of the outer cylinder in the present invention;

[0025] Figure 5Schematic diagram of the coil skeleton in the present invention;

[0026] Figure 6 Schematic diagram of the sealing ring in the present invention;

[0027] Figure 7 Schematic diagram of the vibration radiation plate and guide shaft in the present invention.

[0028] In the figure: 10, outer cylinder; 11, cylinder body; 111, sub-cylinder body; 112, flange; 113, support plate; 12, support plate; 121, support plate; 13, interface cover; 101, accommodating cavity; 102, through hole; 103, external interface; 20, air gap magnetic field assembly; 21, bottom magnetic yoke; 22, external magnetic yoke; 23, internal magnetic yoke; 24, first permanent magnet; 25, second permanent magnet; 201, air gap; 202, internal channel; 30, motion assembly; 31, vibration Dynamic radiation plate; 32. Sealing ring; 321. First mounting part; 322. Second mounting part; 323. Flexible part; 33. Coil skeleton; 331. Seat plate; 332. Cylinder wall; 333. Slot; 334. Hoop reinforcement; 34. Connecting seat; 340. Avoidance hole; 35. Outer pressure ring; 36. Inner pressure ring; 40. Guide assembly; 41. Guide sleeve; 42. Guide shaft; 43. Shaft disk; 50. Limit assembly; 51. Support column; 52. Limit spring; 53. Spring seat. DETAILED DESCRIPTION

[0029] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "top", "bottom", "inside", "outside", "left", "right", "front", "back", "vertical", "horizontal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0031] The terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] refer to Figure 1-Figure 7 As shown, the present invention provides a novel marine electromagnetic controllable vibroseis device, which includes an outer cylinder 10 , two air gap magnetic field assemblies 20 and two motion assemblies 30 .

[0034] The outer cylinder 10 comprises a barrel 11 and a support plate 12. The barrel 11 is cylindrical, open at both ends. The support plate 12 is connected to the barrel 11 and located in the middle of the barrel 11 in the axial direction. The support plate 12 is perpendicular to the axial direction of the barrel 11 and divides the inner cavity of the barrel 11 into two accommodating chambers 101. Furthermore, the barrel 11 is made of non-magnetic stainless steel. While being able to withstand hydrostatic pressure, the wall thickness of the barrel 11 can be minimized to reduce the weight of the outer cylinder 10.

[0035] Two air gap magnetic field assemblies 20 are respectively arranged in the two accommodating cavities 101. Each air gap magnetic field assembly 20 includes a bottom magnetic yoke 21, an outer magnetic yoke 22, an inner magnetic yoke 23, a first permanent magnet 24, and a second permanent magnet 25, which are arranged coaxially with the barrel 11. Specifically, the outer diameters of the inner magnetic yoke 23, the first permanent magnet 24, and the second permanent magnet 25 are equal, and the outer diameters of the outer magnetic yoke 22 and the bottom magnetic yoke 21 are equal but smaller than the inner diameter of the barrel 11. The axial ends of the inner magnetic yoke 23 are respectively connected to the first permanent magnet 24 and the second permanent magnet 25. The first permanent magnet 24 and the second permanent magnet 25 are both axially magnetized but in opposite directions. In other words, the axial ends of the first permanent magnet 24 and the second permanent magnet 25 are respectively north poles and south poles, and the ends of the first permanent magnet 24 and the second permanent magnet 25 connected to the inner magnetic yoke 23 are both north poles or both south poles. The outer yoke 22 is mounted over the inner yoke 23, the first permanent magnet 24, and the second permanent magnet 25 to form an air gap 201. Specifically, the inner diameter of the outer yoke 22 is equal to the sum of the outer diameter of the inner yoke 23 and twice the width of the air gap 201. The axial length of the outer yoke 22 is equal to the sum of the axial lengths of the inner yoke 23 and the two permanent magnets. One end of the bottom yoke 21 is connected to the support plate 12, and the other end is connected to the outer yoke 22 and the second permanent magnet 25. Furthermore, the first permanent magnet 24 and the second permanent magnet 25 are both made of high-energy needle iron boron material with large remanence and strong coercive force; the inner magnetic yoke 23, the outer magnetic yoke 22 and the bottom magnetic yoke 21 are all made of high magnetic permeability materials, and the components of the air gap magnetic field assembly 20 are fixed by magnetic attraction without the need for bolts; the bottom magnetic yoke 21 is provided with a connection structure connected to the support plate 12 at one end facing the support plate 12, thereby connecting the air gap magnetic field assembly 20 as a whole to the support plate 12, and the connection structure includes but is not limited to bolt connection, snap connection, etc.

[0036] To further illustrate, each air gap magnetic field assembly 20 has two main magnetic circuits. This example uses the example of a first permanent magnet 24 and a second permanent magnet 25 with one end connected to the inner yoke 23 having a north pole. One magnetic circuit consists of magnetic flux lines originating from the north pole of the first permanent magnet 24, passing through the inner yoke 23, the air gap 201, the outer yoke 22, and finally returning to the south pole of the first permanent magnet 24. The other magnetic circuit consists of magnetic flux lines originating from the north pole of the second permanent magnet 25, passing through the inner yoke 23, the air gap 201, the outer yoke 22, the bottom yoke 21, and finally returning to the south pole of the bottom permanent magnet. The radial magnetic flux intensities generated by the first and second permanent magnets 24, 25 in the air gap 201 are in the same direction. Each air gap magnetic field assembly 20 utilizes dual permanent magnet excitation. This dual permanent magnet configuration can generate a strong static air gap magnetic field between the inner yoke 23 and the outer yoke 22.

[0037] Two motion assemblies 30 are respectively arranged at the two end openings of the barrel 11. Each motion assembly 30 includes a vibration radiation plate 31, a sealing ring 32, and a coil skeleton 33, which are arranged coaxially with the barrel 11. The inner ring of the sealing ring 32 is sealed to the vibration radiation plate 31, and the outer ring of the sealing ring 32 is sealed to the open end of the barrel 11, thereby achieving a sealed connection between the motion assembly 30 and the barrel 11, making the entire inner cavity of the marine electromagnetic controllable vibrator device in a sealed state. The coil frame 33 is made of aluminum alloy, and the coil frame 33 includes a base plate 331 and a cylindrical wall 332 protruding from one side of the base plate 331; the base plate 331 is connected to the vibration radiation plate 31; the cylindrical wall 332 is a thin-walled cylindrical structure and is inserted into the air gap 201, that is, the inner diameter of the cylindrical wall 332 is larger than the outer diameter of the inner magnetic yoke 23, and the outer diameter of the cylindrical wall 332 is smaller than the inner diameter of the outer magnetic yoke 22; a driving coil (not shown) is wound on the cylindrical wall 332, that is, the driving coil is inserted into the air gap 201; the two driving coils in the two moving components 30 are connected in series but have opposite winding directions.

[0038] When the two drive coils are connected to an alternating current, they are respectively affected by the static air gap magnetic field formed by the two air gap magnetic field assemblies 20, generating an electromagnetic force. Under the action of the electromagnetic force, the drive coils and the coil bobbin 33 drive the vibration radiation plate 31 to move axially. Since the direction and magnitude of the alternating current change periodically with time, the direction of the electromagnetic force also changes with time. Therefore, under the action of the electromagnetic force, the coil bobbin 33 drives the vibration radiation plate 31 to vibrate axially, and the sealing ring 32 undergoes elastic deformation with the vibration of the vibration radiation plate 31, and the sealing ring 32 acts as a dynamic seal. Because the two drive coils are connected in series but with opposite winding directions, the electromagnetic forces on the two coil bobbins 33 are always in opposite directions. Therefore, under the action of the electromagnetic force, the two coil bobbins 33 drive the two vibration radiation plates 31 to vibrate synchronously in opposite directions. That is, the two vibration radiation plates 31 are driven to simultaneously contract inward or extend outward according to the excitation signal waveform of the alternating current. Dynamic pressure is radiated outward by coupling with the seawater, thereby exciting dynamic pressure in the water area, thereby exciting seismic waves for marine seismic exploration. Furthermore, the vibration radiation plate 31 is made of aluminum alloy to reduce the weight of the motion component 30 and improve the ability of the marine electromagnetic controllable vibrator device to radiate dynamic pressure outward.

[0039] It is further explained that because the alternating current is controllable and adjustable and the regulation is efficient and convenient, the marine electromagnetic controllable source device has the following significant advantages compared to traditional air gun seismic sources: it can excite precisely controlled seismic waves; it only excites signals within the effective exploration frequency band, with higher energy utilization rate; it excites continuous vibration signals with low energy density, which is less invasive to the marine ecological environment; the excitation effect is not affected by water depth, and exploration operations can also be carried out in shallow water areas.

[0040] The above-mentioned schematic embodiment significantly enhances the magnetic field strength in each air gap 201 area by setting up dual permanent magnets in each air gap magnetic field component 20, thereby improving the electromagnetic force driving the vibration radiation plate 31; through the symmetrical setting of the two air gap magnetic field components 20 and the symmetrical setting of the two motion components 30, and inserting the driving coil in the motion component 30 into the air gap magnetic field, it is possible to use electromagnetic force to drive the two vibration radiation plates 31 to vibrate synchronously in opposite directions after the driving coil is connected to the alternating current, so that the marine controllable electromagnetic seismic source device can achieve double-sided radiation, enhance its ability to excite dynamic pressure in water areas, and realize high-energy dynamic pressure excitation of the marine electromagnetic controllable seismic source.

[0041] refer to Figure 2-Figure 4 、 Figure 7 As shown, in some embodiments, an axially extending inner channel 202 is provided at the center of the inner magnetic yoke 23, the first permanent magnet 24, the second permanent magnet 25, and the bottom magnetic yoke 21 in each air gap magnetic field assembly 20. A guide assembly 40 is provided between the support plate 12 and each vibration radiation plate 31. The guide assembly 40 includes a guide sleeve 41 and a guide shaft 42 coaxially arranged with the barrel 11. The guide sleeve 41 is connected to the support plate 12 and inserted into the inner channel 202. One end of the guide shaft 42 is connected to the vibration radiation plate 31, and the other end passes through the base plate 331 of the coil bobbin 33 and is inserted into the guide sleeve 41. The guide sleeve 41 is embedded with a linear bearing (not shown) that is compatible with the guide shaft 42. Specifically, the guide shaft 42 is a chrome-plated shaft with high hardness, high wear resistance and good corrosion resistance; a shaft disk 43 is provided at one end of the guide shaft 42, and the diameter of the shaft disk 43 is larger than the guide shaft 42. The shaft disk 43 can be connected to the vibration radiation plate 31 by bolts to realize the installation of the guide shaft 42 on the vibration radiation plate 31.

[0042] In the above-mentioned schematic embodiment, by setting the inner channel 202 in the air gap magnetic field assembly 20, the inner magnetic yoke 23, the bottom magnetic yoke 21, the first permanent magnet 24 and the second permanent magnet 25 are all hollow column structures, which reduces the overall weight of the air gap magnetic field assembly 20 and provides assembly space for the guide assembly 40; through the setting of the guide assembly 40, the vibration radiation plate 31 can be constrained to perform linear reciprocating motion when vibrating, thereby ensuring the reliability and stability of the marine electromagnetic controllable seismic source device during operation.

[0043] refer to Figure 2-Figure 5As shown, in some embodiments, a plurality of limit assemblies 50 are further provided between the support plate 12 and the seat plate 331 of each coil frame 33, and the plurality of limit assemblies 50 are arranged at intervals around the center of the seat plate 331 and are located between the inner channel 202 and the guide sleeve 41; each limit assembly 50 includes a coaxially arranged support column 51 and a limit spring 52, one end of the support column 51 is connected to the seat plate 331, and the other end extends toward the support plate 12, and the limit spring 52 is clamped between the support column 51 and the support plate 12; specifically, the support column 51 and the support plate 12 can each be provided with a spring seat 53, and the two ends of the limit spring 52 are clamped in the spring seat 53. Further explanation: when the vibration radiation plate 31 is in a preset initial vibration position, the limit spring 52 is usually in a natural length state. When the vibration radiation plate 31 vibrates and reciprocates and contracts, the length of the limit spring 52 changes accordingly and is stretched or compressed. Under the action of the spring force of the limit spring 52, the extreme position of the vibration radiation plate 31 when extending outward and contracting inward can be limited.

[0044] refer to Figure 4 As shown, in some embodiments, an acceleration sensor (not shown) is provided on the side of the vibration radiation plate 31 near the accommodating cavity 101 to monitor the vibration acceleration of the vibration radiation plate 31 in real time. A support plate 113 is provided protruding from the inner wall of the barrel 11 near the open end. A displacement sensor (not shown) is mounted on the support plate 113. The displacement sensor probe contacts the vibration radiation plate 31 to monitor the vibration displacement of the vibration radiation plate 31 in real time. Thus, the provision of a velocity sensor and a displacement sensor enables real-time monitoring of the vibration state of the vibration radiation plate 31.

[0045] refer to Figure 1-Figure 3 As shown, in some embodiments, two external interfaces 103 are provided on the sidewall of the barrel 11, and the two external interfaces 103 are respectively connected to the two accommodating chambers 101. The support plate 12 is provided with multiple through-holes 102 to connect the two accommodating chambers 101. Each external interface 103 is sealed with an interface cover 13, which is provided with multiple watertight interfaces. These interfaces include a power interface for providing alternating current to the drive coil, a signal transmission interface for transmitting monitoring information from the acceleration sensor and displacement sensor, and an air pressure interface for adjusting the pressure of the accommodating chamber 101. It should be noted that the air pressure interface is used to balance the pressure difference between the internal cavity pressure of the marine electromagnetic controllable source device and the static pressure of the water area during operation. After the marine electromagnetic controllable source device is submerged, when the internal cavity pressure is unbalanced with the static pressure of the water area, an air compressor is used to supply compressed air to the internal cavity through the air pressure interface until the vibration radiation plate 31 is adjusted to a preset initial vibration position. This exemplary embodiment enables remote control and communication of the marine electromagnetic controllable source device.

[0046] refer to Figure 2 、 Figure 3 As shown, in some embodiments, each motion component 30 further includes a connecting seat 34 coaxially arranged with the barrel 11; the connecting seat 34 is approximately I-shaped, and one end of the connecting seat 34 can be connected to the vibration radiation plate 31 by bolts, and the other end can be connected to the seat plate 331 of the coil skeleton 33 by bolts. A avoidance hole 340 is provided through the center of the connecting seat 34. The size of the avoidance hole 340 is larger than the outer diameter of the shaft disc 43 at the end of the guide shaft 42. The guide shaft 42 passes through the avoidance hole 340 and the seat plate 331 of the coil skeleton 33 and is then inserted into the guide sleeve 41. This illustrative embodiment appropriately increases the distance between the coil skeleton 33 and the vibration radiation plate 31 through the provision of the connecting seat 34, thereby facilitating the arrangement of various sensors and various cables in the accommodating cavity 101.

[0047] refer to Figure 2 、 Figure 6 As shown, in some embodiments, the sealing ring 32 includes a first mounting portion 321 located on its outer circumference, a second mounting portion 322 located on its inner circumference, and a flexible portion 323 connected between the first mounting portion 321 and the second mounting portion 322. The cross-section of the sealing ring 32 is approximately Z-shaped. The open end of the barrel 11 is provided with an outwardly folded flange 112. The first mounting portion 321 is sealed to the flange 112 of the barrel 11 via an outer pressure ring 35. The second mounting portion 322 is sealed to the end of the vibration radiation plate 31 facing the barrel 11 via an inner pressure ring 36. The flexible portion 323 is capable of deforming with the vibration of the vibration radiation plate 31. Specific shapes of the flexible portion 323 include, but are not limited to, arcuate, accordion, and wavy shapes. When the vibration radiation plate 31 extends outward, the flexible portion 323 of the sealing ring 32 is stretched; when the vibration radiation plate 31 contracts inward, the flexible portion 323 of the sealing ring 32 is compressed. Furthermore, the sealing ring 32 is a shaped vulcanized rubber ring structure with good aging resistance, elasticity and compression resistance. This exemplary embodiment refines the structural design of the sealing ring 32, achieving a dynamic seal between the vibration radiation plate 31 and the outer cylinder 10 and ensuring a reliable seal.

[0048] refer to Figure 5 As shown, in some embodiments, a plurality of axially extending slots 333 are spaced apart in the circumferential direction on the cylindrical wall 332 of each coil skeleton 33; when the driving coil is connected to the alternating current, corresponding eddy currents will be induced on the coil skeleton 33 made of aluminum alloy to generate a thermal effect. By setting the slots 333, the thermal effect generated by the eddy current can be effectively reduced.

[0049] refer to Figure 2 、 Figure 5As shown, in some embodiments, two stirrups 334 are provided axially along the outer wall of the cylindrical wall 332 of each coil bobbin 33; the drive coil is a high-temperature-resistant copper enameled wire, which is wound in uniform multiple layers on the outer wall of the cylindrical wall 332 between the two stirrups 334, with the raised height of the stirrups 334 corresponding to the height of the wound drive coil; the two drive coil windings in the two motion components 30 are connected in series and ultimately connected to the power interface on the interface cover 13. When the drive coil is subjected to electromagnetic force, the drive coil does not move relative to the coil bobbin 33 due to the restriction and constraint of the two stirrups 334, and the drive coil and coil bobbin 33 move synchronously; a setting glue can be applied to the outer wall of the cylindrical wall 332 and the drive coil to further ensure that the drive coil and the coil bobbin 33 do not move relative to each other. Furthermore, to prevent the current from being conducted to the coil frame 33 after being energized due to wear of the enameled wire when the drive coil is wound, insulating paper is attached to the cylinder wall 332 between the two stirrups 334 to ensure insulation between the drive coil and the coil frame 33.

[0050] refer to Figures 1-4 Shown, in certain embodiments, barrel 11 comprises two sub-barrels 111 that are axially arranged along it, and two sub-barrels 111 are sealed and connected to each other.Support plate 12 comprises two support plates 121, and two support plates 121 are connected respectively in the two sub-barrels 111 and near an end that two sub-barrels 111 are interconnected, and this moment, whole outer cylinder 10 formed a cavity between two support plates 121, and promptly cavity is between two accommodating chambers 101, and air gap magnetic field assembly 20 is connected on the support plate 121.This illustrative embodiment is by the segmented design of barrel 11 and in each sub-barrel 111, support plate 121 is set respectively, simplified the manufacturing of outer cylinder 10, and is convenient to install air gap magnetic field assembly 20 and motion assembly 30 respectively on two sub-barrels 111, improves assembly efficiency, also is convenient to repair and replace.

[0051] In summary, the new marine electromagnetic controllable vibrator device of the present invention has a simple and compact structure, is easy to manufacture and assemble, and has strong practicality; through the arrangement of dual permanent magnets in each air gap magnetic field component 20, the magnetic field strength in each air gap 201 area is significantly enhanced, thereby improving the electromagnetic force driving the vibration radiation plate 31; through the symmetrical arrangement of the two air gap magnetic field components 20, the symmetrical arrangement of the two motion components 30, and the arrangement of the driving coil in the motion component 30 inserted in the air gap 201 area, the electromagnetic force can be used to drive the two vibration radiation plates 31 to vibrate synchronously in opposite directions after the driving coil is connected to the alternating current, thereby realizing high-energy dynamic pressure excitation of the marine electromagnetic controllable vibrator, providing a new vibrator device based on electromagnetic drive for marine seismic exploration, solving the shortcomings of traditional air gun vibrators in marine seismic exploration, and realizing green and efficient marine seismic exploration.

[0052] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons of ordinary skill in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should be included in the scope of the technical solutions for which protection is sought.

Claims

1. A new type of marine electromagnetic vibroseis device, characterized in that: include: The outer cylinder comprises a cylinder body and a support plate; the cylinder body is cylindrical with two ends open, and the cylinder body comprises two sub-cylinder bodies arranged along its axial direction, and the two sub-cylinder bodies are sealed and connected to each other; the support plate comprises two support plates, and the two support plates are respectively connected to the two sub-cylinder bodies and close to the ends where the two sub-cylinder bodies are connected to each other, and the two support plates divide the inner cavity of the cylinder body into two accommodating cavities and a cavity between the two accommodating cavities; Two air gap magnetic field assemblies, which are respectively arranged in the two accommodating cavities; each of the air gap magnetic field assemblies includes a bottom magnetic yoke, an outer magnetic yoke, an inner magnetic yoke, a first permanent magnet and a second permanent magnet coaxially arranged with the barrel, the axial ends of the inner magnetic yoke are respectively connected to the first permanent magnet and the second permanent magnet, the first permanent magnet and the second permanent magnet are both axially magnetized but in opposite magnetization directions, the outer magnetic yoke is sleeved on the outside of the inner magnetic yoke, the first permanent magnet and the second permanent magnet to form an air gap, one end of the bottom magnetic yoke is connected to the support plate, and the other end is connected to the outer magnetic yoke and the second permanent magnet; Two motion components are respectively arranged at the two end openings of the barrel; each motion component includes a vibration radiation plate, a sealing ring, and a coil skeleton arranged coaxially with the barrel, the inner ring of the sealing ring is sealed with the vibration radiation plate, and the outer ring of the sealing ring is sealed with the open end of the barrel; the coil skeleton includes a base plate and a barrel wall protruding from one side of the base plate, the base plate is connected to the vibration radiation plate, the barrel wall is inserted into the air gap, and a driving coil is wound on the barrel wall; the two driving coils of the two motion components are connected in series but have opposite winding directions; A guide assembly is provided between the support plate and each vibration radiation plate, the guide assembly comprising a guide sleeve and a guide shaft coaxially arranged with the barrel; an axially extending inner channel is provided at the center of the inner magnetic yoke, the first permanent magnet, the second permanent magnet, and the bottom magnetic yoke in each of the air gap magnetic field assemblies; the guide sleeve is connected to the support plate and inserted into the inner channel; one end of the guide shaft is connected to the vibration radiation plate, and the other end passes through the base plate and is inserted into the guide sleeve, wherein a linear bearing adapted to the guide shaft is embedded in the guide sleeve; A plurality of limiting assemblies are provided between the support plate and the base plate of each coil skeleton. The plurality of limiting assemblies are arranged at intervals around the center of the base plate and are located between the inner channel and the guide sleeve. Each limiting assembly includes a support column and a limiting spring. One end of the support column is connected to the base plate, and the other end extends toward the support plate. The limiting spring is sandwiched between the support column and the support plate. When the two driving coils are connected to an alternating current, the two coil frames drive the two vibration radiation plates to vibrate synchronously and in opposite directions under the action of electromagnetic force, so as to stimulate dynamic pressure in the water area.

2. The novel marine electromagnetic vibroseis device according to claim 1, characterized in that: Each of the motion components further includes a connecting seat, one end of which is connected to the vibration radiation plate, and the other end is connected to the seat plate of the coil frame; an avoidance hole is formed through the connecting seat, and the guide shaft passes through the avoidance hole.

3. The novel marine electromagnetic vibroseis device according to claim 1, characterized in that: An acceleration sensor is provided on the side of the vibration radiation plate close to the accommodating cavity; a support plate is protruded on the inner wall of the cylinder body close to the opening end, and a displacement sensor is installed on the support plate, and the probe of the displacement sensor is in contact with the vibration radiation plate.

4. The novel marine electromagnetic vibroseis device according to claim 3, characterized in that: Two external interfaces are provided on the side wall of the barrel, and the two external interfaces are respectively connected to the two accommodating chambers; a plurality of through holes are provided on the support plate to connect the two accommodating chambers; an interface cover is sealedly connected to each of the external interfaces, and a plurality of watertight interfaces are provided on the interface cover, including a power supply interface for providing alternating current to the driving coil, a signal transmission interface for transmitting monitoring information of the acceleration sensor and the displacement sensor, and an air pressure interface for adjusting the pressure of the accommodating chamber.

5. The novel marine electromagnetic vibroseis device according to claim 1, characterized in that: The sealing ring includes a first mounting portion located at the outer ring, a second mounting portion located at the inner ring, and a flexible portion connected between the first mounting portion and the second mounting portion; the open end of the cylinder body is provided with an outward-folded flange, and the first mounting portion is sealed to the flange of the cylinder body through an outer pressure ring; the second mounting portion is sealed to the end of the vibration radiation plate facing the cylinder body through an inner pressure ring; the flexible portion has the ability to deform with the vibration of the vibration radiation plate.

6. The novel marine electromagnetic vibroseis device according to claim 1, characterized in that: A plurality of axially extending slots are spaced apart in the circumferential direction on the cylindrical wall of each coil skeleton.

7. The novel marine electromagnetic vibroseis device according to claim 1, characterized in that: Two stirrups are protruded along the axial direction of the outer wall of the cylinder wall of each coil skeleton, and the driving coil is wound on the cylinder wall between the two stirrups; insulating paper is pasted on the cylinder wall between the two stirrups.

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