A seafloor seismograph

Abstract

The present invention belongs to the technical field of marine equipment, and specifically discloses a seafloor seismograph, including a shell, an instrument mounting frame, a monitoring device and an auxiliary recovery device; the instrument mounting frame includes a mud stop plate and a lifting lug; the monitoring device includes an instrument compartment device and an electromagnetic acoustic release device, the electromagnetic release device is provided with a permanent magnet and an electromagnet, and the magnetic force of the electromagnet and the magnetic force of the permanent magnet are repelled; the seafloor seismograph using the above structural design can efficiently release the counterweight assembly through the setting of the electromagnetic release device to achieve the recovery of the instrument, and can also save electric energy, and only release the counterweight assembly when the instrument needs to be recovered, and the electromagnet needs to be powered. In addition, through the setting of the shell and the instrument mounting frame, many problems caused by the traditional glass float design are effectively changed, thereby greatly reducing the resistance of the seafloor seismograph, effectively improving the noise reduction level, and then also making the quality of the collected data improved to a certain extent.

Description

Technical Field

[0001] The present invention relates to the technical field of marine equipment, and in particular to a seafloor seismograph. Background Art

[0002] Short-period seafloor seismometers are widely used in the fields of oil and gas resource exploration and development, detection of the earth's internal structure, etc. According to the different observation bands of seafloor seismometers, seafloor seismometers can be divided into: broadband seafloor seismometers, short-period seafloor seismometers, etc. Broadband seafloor seismometers are usually used to observe vibrations generated by active sources (natural earthquakes), while short-period seafloor seismometers are more conducive to the observation of passive sources (artificial sources).

[0003] The working process of the seafloor seismometer is as follows: the experimenter reaches the predetermined position through the experimental ship, and after the instrument is checked and GPS time is synchronized, the instrument is released; it sinks freely to the seabed under the action of gravity, and then autonomously performs self-inspection, seismometer leveling, and the data acquisition system starts data collection. After completing the experimental task, the experimenter comes to the release site again and sends a release command through the deck unit (sending acoustic communication commands); after receiving the command, the acoustic release system on the instrument executes the release command, releases the counterweight, and the instrument floats autonomously; after surfacing, the instrument is designed with a flag, strobe light and radio beacon auxiliary recovery system, which can detect whether the instrument has surfaced and the light conditions, and help the experimenter to assist in searching for the instrument at sea; after searching for the instrument, the experimental data can be downloaded for analysis and research by technical personnel.

[0004] At present, the overall structure of the seafloor seismometer mainly adopts a glass float to provide buoyancy and serve as a pressure chamber. All devices are placed inside the glass float. The electrochemical corrosion method is used to release the sinker coupling frame to realize instrument recovery. Its structure is compact, and the glass float has the dual functions of providing buoyancy and pressure chamber, which saves costs. However, due to the particularity of glass material, there are defects such as fracturing, leakage, and inconvenient installation. In addition, the seafloor seismometer with a float design has the problems of large size, poor coupling with the seabed plane, large fluid resistance, and greater impact from the seabed bottom current, which results in large noise and makes it impossible to collect high-quality data. Summary of the invention

[0005] The object of the present invention is to provide a seafloor seismometer which has a compact structure, can be well coupled with the seafloor plane, has low sinking energy consumption and small resistance, can effectively improve the noise reduction level, and then improve the quality of the collected data.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A seafloor seismograph comprising:

[0008] The shell is made of buoyancy material in one piece;

[0009] An instrument mounting frame, matched with the housing, the instrument mounting frame comprising a mud block and a lifting ear fastened to the mud block;

[0010] A monitoring device, comprising an instrument compartment device and an electromagnetic acoustic release device, wherein the electromagnetic acoustic release device comprises a transducer unit, an acoustic control unit and an electromagnetic release device; the instrument compartment device, the transducer unit and the electromagnetic release device are all fastened to the instrument mounting frame, and the acoustic control unit is arranged in the compartment body of the instrument compartment device;

[0011] an auxiliary recovery device, including a flag and a radio beacon respectively fastened to the instrument mounting frame, and a counterweight assembly disposed at the bottom of the fender;

[0012] The electromagnetic release device is provided with a permanent magnet and an electromagnet, and the magnetic force of the electromagnet is arranged to repel the magnetic force of the permanent magnet; when the electromagnet stops supplying power, the counterweight assembly is adsorbed on the lower bottom surface of the mud stop plate by the magnetic force of the permanent magnet.

[0013] Among them, the electromagnetic release device is fastened to the upper surface of the mud barrier, and the electromagnetic release device includes a box body, an electromagnet core body arranged in the box body, a coil matching the electromagnet core body, a connector matching the box body for electrical connection with the coil, and the permanent magnet arranged in the box body.

[0014] The counterweight assembly includes a counterweight block, an armature buried in the middle of the counterweight block, a plurality of coupling columns arranged on the lower bottom surface of the counterweight block, and a circular plate arranged in the cavity of the coupling columns.

[0015] The instrument compartment device is mounted above the electromagnetic release device, and support seats for mounting the instrument compartment device are arranged at both ends of the instrument compartment device, and the support seats are fastened to the mud stopper.

[0016] The lifting ear comprises a first lifting ear vertically fastened to one end of the fender, and a second lifting ear horizontally fastened to the other end of the fender; the flag and the radio beacon are fastened to the first lifting ear, and the end of the second lifting ear is bent upward.

[0017] Wherein, the first hanging ear bracket is provided with a bracket, and the bracket is provided with the transducer unit.

[0018] The instrument chamber device includes a pressure-resistant chamber, a battery pack module and a seismometer module arranged in the cavity of the pressure-resistant chamber.

[0019] The seismometer module comprises an automatic balancing mechanism, a three-component seismometer, a control system and a data acquisition module which are tightly and rotatably connected to the automatic balancing mechanism.

[0020] Among them, the automatic balancing mechanism includes an outer ring frame and an inner ring frame pivotally connected to the outer ring frame, the inner ring frame is rotatably connected to the three-component seismometer through a rotating shaft, and locking mechanisms are provided between the three-component seismometer and the inner ring frame, and between the inner ring frame and the outer ring frame.

[0021] Among them, the control system and data acquisition module are provided on one side wall of the outer ring frame, and the control system and data acquisition module are fastened to the end cover of the pressure-resistant warehouse.

[0022] The beneficial effects of the present invention are as follows: the present invention discloses a seafloor seismograph, comprising a shell, an instrument mounting frame, a monitoring device and an auxiliary recovery device; the shell is integrally processed with buoyancy material; the instrument mounting frame comprises a mud stop plate and a lifting ear fastened to the mud stop plate; the monitoring device comprises an instrument bin device and an electromagnetic acoustic release device, the electromagnetic acoustic release device comprises a transducer unit, an acoustic control unit and an electromagnetic release device; the instrument bin device, the transducer unit and the electromagnetic release device are all fastened to the instrument mounting frame, and the acoustic control unit is arranged in the bin body of the instrument bin device; the auxiliary recovery device comprises a flag and a radio beacon fastened to the instrument mounting frame respectively, and a counterweight assembly arranged at the bottom of the mud stop plate; the electromagnetic release device is provided with a permanent magnet and an electromagnet, and the magnetic force of the electromagnet is arranged to repel the magnetic force of the permanent magnet; when the electromagnet stops supplying power, the counterweight assembly is adsorbed on the lower bottom surface of the mud stop plate by the magnetic force of the permanent magnet. The seafloor seismometer with the above structural design can efficiently release the counterweight assembly through the setting of the electromagnetic release device to achieve the recovery of the instrument, and it can also save electricity. The counterweight assembly is released only when the instrument needs to be recovered, and the electromagnet needs to be powered. In addition, through the setting of the shell and the instrument mounting frame, many problems caused by the traditional glass float design are effectively changed, which greatly reduces the resistance of the seafloor seismometer, effectively improves the noise reduction level, and also improves the quality of the collected data to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an axonometric diagram of an ocean bottom seismograph of the present invention.

[0024] Figure 2 yes Figure 1 Top view of the .

[0025] Figure 3 yes Figure 1 Axonometric view with the shell removed.

[0026] Figure 4 yes Figure 1 Half-section view.

[0027] Figure 5 yes Figure 4 A partial enlarged view of point A in the middle.

[0028] Figure 6 yes Figure 1 Axonometric view of the electromagnetic release device.

[0029] Figure 7 yes Figure 1 Axonometric view of the center counterweight assembly.

[0030] Figure 8 yes Figure 1 Axonometric view of the seismometer module.

[0031] In the figure:

[0032] 1. Shell;

[0033] 21. Mud stopper; 22. First lifting eye; 23. Second lifting eye; 24. Support seat;

[0034] 31. Flag; 32. Radio beacon; 33. Counterweight assembly; 331. Counterweight block; 332. Armature; 333. Coupling column; 334. Round plate;

[0035] 4. Instrument compartment device; 41. Pressure-resistant compartment; 42. Battery module; 431. Automatic balancing mechanism; 4311. Outer ring frame; 4312. Inner ring frame; 4313. Locking mechanism; 432. Three-component seismometer; 433. Control system and data acquisition module;

[0036] 51. Transducer unit; 52. Acoustic control unit; 53. Electromagnetic release device; 531. Box body; 532. Electromagnetic core; 533. Coil; 534. Connector; 535. Permanent magnet. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] Combination Figures 1 to 8 As shown, this embodiment provides a seafloor seismograph, including a housing 1, an instrument mounting frame, a monitoring device, and an auxiliary recovery device. Specifically, the housing 1 is made of pressure-resistant synthetic foam and epoxy resin-based glass microspheres as buoyancy materials, which are processed in one piece, thereby providing the whole machine with good rising buoyancy. Compared with the traditional design using glass microspheres, the pressure-resistant buoyancy material has obvious advantages in terms of pressure-resistant reliability and freedom to design into required shapes. In order to better reduce fluid resistance and improve the noise reduction level of the whole machine, the housing 1 in this embodiment preferably adopts a streamlined design.

[0042] Furthermore, in the present embodiment, the instrument mounting frame fastened to the shell 1 includes a mud barrier 21 and a lifting ear fastened to the mud barrier 21; preferably, in order to facilitate lifting, the lifting ear includes a first lifting ear 22 vertically fastened to one end of the mud barrier 21, and a second lifting ear 23 horizontally fastened to the other end of the mud barrier 21. In order to facilitate lifting, it is further preferred that the end of the second lifting ear 23 is bent upward.

[0043] More specifically, the auxiliary recovery device in this embodiment includes a flag 31 and a radio beacon 32 respectively fastened to the instrument mounting frame, and a counterweight assembly 33 arranged at the bottom of the fender 21; preferably, the flag 31 and the radio beacon 32 are vertically fastened to the first lifting ear 22 and exposed to the shell 1, so as to ensure that the instrument can be quickly found on the sea surface after it surfaces. The flag 31 and the strobe light (detection light, flashing light at night) are mainly for visual search. The radio beacon 32 triggers the pressure switch when the instrument floats to the sea surface, and transmits a position signal (within 5-8 kilometers) to the recovery receiver, which facilitates the search for the instrument on the sea surface.

[0044] To be more specific, the electromagnetic release device 53 in this embodiment is fastened to the upper surface of the mud barrier 21, and the electromagnetic release device 53 includes a box body, an electromagnet core 532 arranged in the box body, a coil 533 matched with the electromagnet core 532, a connector 534 matched with the box body for electrical connection with the coil 533, and a permanent magnet 535 arranged in the box body.

[0045] Furthermore, the counterweight assembly 33 includes a counterweight block 331, an armature 332 buried in the middle of the counterweight block 331, a plurality of coupling columns 333 disposed on the bottom surface of the counterweight block 331, and a circular plate 334 disposed in the cavity of the coupling column 333. With this structural design, the plurality of coupling columns 333 are arranged to expand in all directions to increase coupling with the seabed sediment layer, but the mud blocking plate 21 is designed to prevent the weight from sinking too deep into the sediment layer and affecting recovery.

[0046] As a further preference, in order to reduce the energy consumption when the instrument sinks, the practice of using electromagnetic force to adsorb the counterweight assembly 33 when the traditional seafloor seismograph sinks is changed. In this embodiment, the magnetic force of the above-mentioned electromagnet and the magnetic force of the permanent magnet 535 are set to repel each other; when the seafloor seismograph sinks, the electromagnet stops supplying power (that is, the coil 533 is powered off), and the counterweight assembly 33 is adsorbed on the lower bottom surface of the mud barrier 21 by the magnetic force of the permanent magnet 535. Conversely, when the seafloor seismograph floats, the electromagnet is energized (that is, the coil 533 is energized), and under the repulsive effect of the electromagnetic force, the counterweight assembly 33 breaks free from the adsorption of the permanent magnet 535 and then detaches from the seafloor seismograph.

[0047] As a further preference, the monitoring device in this embodiment includes an instrument compartment device 4 and an electromagnetic acoustic release device, the electromagnetic acoustic release device includes a transducer unit 51, an acoustic control unit 52 and an electromagnetic release device 53; the instrument compartment device 4, the transducer unit 51 and the electromagnetic release device 53 are all fastened to the instrument mounting frame, the acoustic control unit 52 is arranged in the compartment body of the instrument compartment device 4, and the transducer unit 51 is mounted on the first hanging ear 22 through a bracket.

[0048] Preferably, the electromagnetic release device 53 is connected to the watertight connector 534 on the end cover of the instrument compartment device 4 through a deep-sea watertight connector 534, and is internally connected to the acoustic control unit 52. At the same time, the transducer unit 51 is also connected to the acoustic control unit 52 through the watertight connector 534, and together they form a set of electromagnetic acoustic release devices for system control to release the counterweight assembly 33, so as to recover the instrument after the instrument completes the task. When a recovery command is issued (usually on a ship or on the deck through a set of matching underwater acoustic communication systems) and propagates through the water body, the transducer unit 51 on the instrument receives the corresponding command, and the acoustic control unit 52 compiles (demodulates, decodes, etc.) the electromagnetic release device 53 to implement corresponding control, that is, the internal coil 533 of the electromagnetic release device 53 is turned on, generating a magnetic field with the same magnetic field strength and opposite direction as the permanent magnet 535, thereby offsetting its adsorption on the counterweight module.

[0049] More specifically, an instrument compartment device 4 is mounted above the electromagnetic release device 53, and two support seats 24 for mounting the instrument compartment device 4 are provided at both ends of the instrument compartment device 4, and the two support seats 24 are fastened to the mud blocking plate 21. Preferably, the instrument compartment device 4 includes a pressure-resistant compartment 41, a battery module 42 disposed in the cavity of the pressure-resistant compartment 41, and a seismometer module. The pressure-resistant compartment 41 replaces the glass ball as the instrument compartment, and uses pressure-resistant buoyancy materials to provide buoyancy, thereby improving the reliability of the instrument working on the seabed. Traditional instruments use glass balls as the pressure-resistant compartment 41 and provide buoyancy, which has a higher risk factor. To be more specific, the seismometer module includes an automatic balancing mechanism 431, and a three-component seismometer 432 and a control system and data acquisition module 433 that are fastened and rotatably connected to the automatic balancing mechanism 431. The automatic balancing mechanism 431 includes an outer ring frame 4311, and an inner ring frame 4312 pivotally connected to the outer ring frame 4311. The inner ring frame 4312 is rotatably connected to the three-component seismometer 432 via a rotating shaft. Locking mechanisms 4313 are provided between the three-component seismometer 432 and the inner ring frame 4312, as well as between the inner ring frame 4312 and the outer ring frame 4311. A control system and data acquisition module 433 is provided on one side wall of the outer ring frame 4311, and the other side wall of the outer ring frame 4311 is fastened to the end cover of the pressure-resistant chamber 41.

[0050] With the above structural design, the inner ring frame 4312 and the three-component seismometer 432, as well as the inner ring frame 4312 and the outer ring frame 4311 can rotate with each other during leveling; they can also be locked by the locking mechanism 4313 after leveling, that is, the automatic leveling and locking of the instrument is completed, and then normal operation can be performed. (After the seafloor seismograph sinks to the seabed, due to the uncertainty of the inclination of the seabed plane, and the seismometer needs to remain horizontal to record valid data, the instrument needs to be automatically leveled before it sinks to the seabed and officially works). With the automatic balancing mechanism 431, after the seafloor seismograph sinks to the seabed, the main control system uses the inclination sensor to perform automatic posture detection on the seismometer, and automatically levels the seismometer in the vertical direction to ensure that the seismometer remains relatively horizontal when it is working normally, thereby improving the data recording quality of the instrument.

[0051] The specific circuit control principle and circuit arrangement of the monitoring device in the present embodiment have been disclosed in the relevant technology and will not be described in detail here.

[0052] The above-mentioned structure is used to arrange the seafloor seismograph, which is extremely compact and small, has no redundant space, and has a low center of gravity, so that it is easy to couple with the seafloor more effectively. In the short-period seafloor seismograph, an electromagnetic acoustic release device is innovatively used, which has magnetism when the power is off (due to the addition of permanent magnets 535), can adsorb the counterweight component 33, does not consume electricity when working on the seafloor, and only powers on when recovering, with very little power consumption, and its simple and efficient electromagnetic release device 53 realizes the seafloor recovery of the seafloor seismograph.

[0053] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A seafloor seismograph, characterized in that: include: The shell (1) is made of buoyancy material and is integrally processed; An instrument mounting frame, matched with the housing (1), the instrument mounting frame comprising a mud baffle (21) and a hanging ear fastened to the mud baffle (21); A monitoring device, comprising an instrument compartment device (4) and an electromagnetic acoustic release device, wherein the electromagnetic acoustic release device comprises a transducer unit (51), an acoustic control unit (52) and an electromagnetic release device (53); the instrument compartment device (4), the transducer unit (51) and the electromagnetic release device (53) are all fastened to the instrument mounting frame, and the acoustic control unit (52) is arranged in the compartment body of the instrument compartment device (4); an auxiliary recovery device, comprising a flag (31) and a radio beacon (32) respectively fastened to the instrument mounting frame, and a counterweight assembly (33) arranged at the bottom of the fender (21); The electromagnetic release device (53) is provided with a permanent magnet (535) and an electromagnet, and the magnetic force of the electromagnet is arranged to repel the magnetic force of the permanent magnet (535); when the electromagnet stops supplying power, the counterweight assembly (33) is adsorbed on the lower bottom surface of the mud stop plate (21) by the magnetic force of the permanent magnet (535); The counterweight assembly (33) comprises a counterweight block (331), an armature (332) buried in the middle of the counterweight block (331), a plurality of coupling columns (333) arranged on the bottom surface of the counterweight block (331), and a circular plate (334) arranged in the cavity of the coupling columns (333); The instrument chamber device (4) comprises a pressure-resistant chamber (41), a battery module (42) and a seismometer module arranged in a cavity of the pressure-resistant chamber (41).

2. A seafloor seismograph according to claim 1, characterized in that: The electromagnetic release device (53) is fastened to the upper surface of the mud barrier (21), and comprises a box body, an electromagnet core (532) arranged in the box body, a coil (533) matched with the electromagnet core (532), a connector (534) matched with the box body for electrical connection with the coil (533), and the permanent magnet (535) arranged in the box body.

3. A seafloor seismograph according to claim 1, characterized in that: The instrument compartment device (4) is mounted above the electromagnetic release device (53), and support seats (24) for mounting the instrument compartment device (4) are arranged at both ends of the instrument compartment device (4), and the support seats (24) are fastened to the mud blocking plate (21).

4. A seafloor seismograph according to claim 1, characterized in that: The lifting lug comprises a first lifting lug (22) vertically fastened to one end of the fender (21), and a second lifting lug (23) horizontally fastened to the other end of the fender (21); the flag (31) and the radio beacon (32) are fastened to the first lifting lug (22), and the end of the second lifting lug (23) is bent upward.

5. A seafloor seismograph according to claim 4, characterized in that: The first hanging ear (22) is provided with a bracket, and the bracket is provided with the transducer unit (51).

6. The seafloor seismograph according to claim 1, characterized in that: The seismometer module comprises an automatic balancing mechanism (431), a three-component seismometer (432) which is tightly and rotatably connected to the automatic balancing mechanism (431), and a control system and a data acquisition module (433).

7. A seafloor seismograph according to claim 6, characterized in that: The automatic balancing mechanism (431) comprises an outer ring frame (4311) and an inner ring frame (4312) pivotally connected to the outer ring frame (4311); the inner ring frame (4312) is rotatably connected to the three-component seismometer (432) via a rotating shaft; locking mechanisms (4313) are provided between the three-component seismometer (432) and the inner ring frame (4312), and between the inner ring frame (4312) and the outer ring frame (4311).

8. A seafloor seismograph according to claim 7, characterized in that: The control system and data acquisition module (433) is provided on one side wall of the outer ring frame (4311), and the control system and data acquisition module (433) are fastened to the end cover of the pressure-resistant chamber (41).

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