A method for preparing a housing for a deep-sea magnetometer and a deep-sea magnetometer

Abstract

The application discloses a shell preparation method for a deep-sea magnetometer and the deep-sea magnetometer, and belongs to the field of magnetometers. The method comprises the following steps: placing a container containing resin glue in liquid nitrogen to cool to 0 DEG C, and then transferring the container to an ice-water mixture; adding boron with a final mass of 0.8 ‰-1.2 ‰ into the resin glue, stirring uniformly to form a composite glue; transferring the container to a vacuum device to perform vacuumization; when there is no air bubble in the composite glue, transferring the container to the ice-water mixture again for use; taking a hollow mold with ice water flowing in the interior of the mold; alternately uniformly applying the composite glue and winding aramid fibers on the surface of the hollow mold to form a multilayer structure in which the composite glue layer and the aramid fiber layer are alternated, and the innermost layer and the outermost layer are both the composite glue layer; keeping the ice water flowing in the interior of the hollow mold until the multilayer structure is solidified, performing magnetic shielding treatment through a magnetic shielding device, and obtaining a required shell. The shell prepared by the application has the advantages of high pressure resistance depth, high breaking strength, high toughness, and low magnetism.

Description

Technical Field

[0001] This invention relates to the field of magnetometer technology, and in particular to a method for preparing the shell of a deep-sea magnetometer and the deep-sea magnetometer itself. Background Technology

[0002] A marine magnetometer is a magnetometer used to measure the intensity of the Earth's magnetic field. It is a high-precision magnetic anomaly detector suitable for high-precision magnetic measurements in airborne and marine geophysical exploration, and can also be used for airborne magnetic anomaly detection. Marine magnetometers are characterized by digitization, modularity, miniaturization, and system integration. High-sensitivity magnetometers made using optical pumping technology have significant advantages such as no zero-point drift, no need for strict orientation, low sensitivity to surrounding magnetic field gradients, and continuous measurement capabilities. They are currently widely used in airborne and marine geophysical exploration.

[0003] A marine magnetometer consists of a housing and a modem housed within the housing. Use requires the housing to be deployed into the ocean. Existing marine magnetometers typically use resin-coated housings, with a maximum pressure resistance depth of 200m for a 10mm thick housing, rendering the magnetometer unusable in deep-sea environments. Summary of the Invention

[0004] In view of the problem that the mechanical properties of the shell of the deep-sea magnetometer in the prior art are insufficient, the purpose of the present invention is to provide a method for manufacturing the shell of the deep-sea magnetometer and the deep-sea magnetometer, so as to at least partially solve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention provides a method for preparing the shell of a deep-sea magnetometer, the method comprising the following steps:

[0007] The container containing the resin glue was placed in liquid nitrogen for cooling.

[0008] Once the resin has cooled to 0°C, transfer the container to an ice-water mixture.

[0009] Add boron with a final mass of 0.8‰-1.2‰ to the resin adhesive in the container, stir evenly, and form a composite adhesive;

[0010] The container is then transferred to a vacuum device for vacuuming.

[0011] When there are no air bubbles in the composite adhesive in the container, transfer the container to an ice-water mixture for later use.

[0012] Take a hollow mold with ice water circulating inside;

[0013] The composite adhesive is applied evenly to the surface of the hollow mold alternately, and aramid fibers are wound evenly to form a multi-layer structure in which the composite adhesive layer and the aramid fiber layer alternate. The innermost and outermost layers of the multi-layer structure are both composite adhesive layers.

[0014] Maintain the circulation of ice water inside the hollow mold until the multi-layer structure solidifies to obtain a shell for a deep-sea magnetometer.

[0015] During the curing process of the multi-layer structure, the hollow mold and the ice-water mixture flowing inside it are magnetically shielded by a magnetic shielding device.

[0016] In a preferred embodiment, the composite adhesive contains 1‰ of boron by mass.

[0017] In a preferred embodiment, the magnetic shielding device includes a shielding shell made of permalloy material. The shielding shell includes a shell and a cover that are detachably connected to each other. The shell contains an ice-water mixture. The hollow mold is fixed in the shell by a bracket. One end of the hollow mold is connected to the ice-water mixture contained in the shell through a water inlet pipe. A pump is also installed on the shell and connected in series in the water inlet pipe.

[0018] In a preferred embodiment, the magnetic shielding device further includes a thermal insulation layer covering the outside of the shielding shell, the thermal insulation layer being made of thermal insulation material.

[0019] In a preferred embodiment, the pump includes a pump head and a motor, wherein the pump head is fixedly mounted on one side of the inner wall of the housing, and the motor is fixedly mounted on one side of the outer wall of the housing.

[0020] In a preferred embodiment, in the multilayer structure, the thickness of the composite adhesive layer is 0.2-1 mm, the thickness of the aramid fiber layer is 0.1 mm, and the aramid fiber layer is a single layer of aramid fiber.

[0021] In a preferred embodiment, the thickness of the multilayer structure is 10 mm.

[0022] In a preferred embodiment, the curing time of the multilayer structure is 24-48 hours.

[0023] In a preferred embodiment, the container is made of a material with high thermal conductivity.

[0024] Secondly, the present invention also provides a deep-sea magnetometer comprising a shell prepared according to the above method.

[0025] The beneficial effects of the present invention using the above technical solution are as follows: By controlling the temperature during raw material preparation, processing, and curing, the compressive strength of the outer shell is effectively improved; the toughness and fracture strength of the outer shell are improved due to the aramid fiber layer and the incorporation of boron; and the magnetic shielding device during curing effectively reduces the magnetism of the outer shell itself, thereby improving the accuracy of the magnetometer. In summary, when the outer shell prepared by the method of the present invention is applied to a magnetometer, it can effectively improve the working depth and accuracy of the magnetometer. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating the method for preparing the outer shell of the deep-sea magnetometer in this invention.

[0027] Figure 2 This is a schematic diagram of the magnetic shielding device in this invention;

[0028] Figure 3 This is a cross-sectional schematic diagram of the outer shell of the deep-sea magnetometer used in this invention.

[0029] In the diagram: 1-Shielding shell, 11-Shell, 12-Shell cover, 13-Insulation layer, 2-Hollow mold, 3-Bracket, 4-Water inlet pipe, 5-Pump. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the description of the structure of this invention shown in the accompanying drawings. They are only for the convenience of describing this invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] The terms "first" and "second" in this technical solution are merely designations for corresponding structures that are identical or similar, or that perform similar functions. They do not represent an arrangement of the importance of these structures, nor do they imply any ranking, comparison of size, or other meaning.

[0033] Furthermore, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, a connection 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 a connection within two structures. Those skilled in the art can understand the specific meaning of the above terms in this invention by considering the overall concept of the invention and the specific context of the solution.

[0034] Example 1

[0035] like Figure 1 As shown in the figure, this invention provides a method for preparing the shell of a deep-sea magnetometer, the method comprising the following steps:

[0036] Step S1. Place the container containing the resin glue in liquid nitrogen for cooling treatment;

[0037] Step S2. After the resin has cooled to 0°C, transfer the container to an ice-water mixture;

[0038] Step S3. Add boron with a final mass of 1‰ to the resin glue in the container, stir evenly to form a composite glue;

[0039] Step S4. Transfer the container to a vacuum device for vacuuming.

[0040] Step S5. When there are no air bubbles in the composite adhesive in the container, transfer the container to the ice-water mixture and set aside for later use;

[0041] Step S6. Take a hollow mold with ice water flowing inside;

[0042] Step S7. Alternately and evenly apply composite adhesive and evenly wind aramid fibers on the surface of the hollow mold to form a multi-layer structure in which the composite adhesive layer and the aramid fiber layer alternate. The innermost and outermost layers of the multi-layer structure are both composite adhesive layers.

[0043] Step S8. Maintain the circulation of ice water inside the hollow mold until the multi-layer structure solidifies to obtain the outer shell for the deep-sea magnetometer.

[0044] During the curing process of the multi-layer structure, a magnetic shielding device is used to magnetically shield the hollow mold and the ice-water mixture flowing inside it.

[0045] In this embodiment, the container is made of a material with high thermal conductivity, such as an iron drum, aluminum drum, or copper drum. In step S1, the temperature of the resin is monitored in real time by inserting a temperature sensor or thermometer into the resin. In step S2, the iron drum containing the resin is partially submerged in an ice-water mixture. Partial submersion means that the level of the ice-water mixture is below the top edge of the iron drum but above the top surface of the resin inside. In step S3, the mixture is stirred manually or electrically. The resulting uniformly stirred mixture of boron and resin is called the composite adhesive.

[0046] In step S4, the vacuum device is configured as a vacuum container with a sealable opening, connected to a vacuum pump. When the iron drum containing the composite adhesive is placed into the vacuum container and the vacuum pump is started, a vacuum negative pressure is generated inside the vacuum container, causing the air bubbles generated inside the composite adhesive due to stirring to burst under the vacuum negative pressure. The vacuuming process usually lasts for a certain period of time, depending on the volume of the composite adhesive; the larger the volume, the longer the duration. Typically, the pressure inside the vacuum container needs to be evacuated to -0.1 MPa, i.e., a complete vacuum.

[0047] In this embodiment, as Figure 2 As shown, in step S6, the hollow mold is pre-arranged inside the magnetic shielding device. The magnetic shielding device includes a shielding shell 1 made of permalloy material. The shielding shell 1 includes a shell 11 and a shell cover 12 that are detachably connected to each other. The shell 11 contains an ice-water mixture, and the hollow mold 2 is fixed in the shell 11 by a bracket 3. Typically, the magnetic shielding device also includes a thermal insulation layer 13 covering the outside of the shielding shell. This thermal insulation layer 13 is made of thermal insulation material.

[0048] The bracket 3 has positioning sleeves made of plastic or metal welded to both ends of its top surface. The hollow mold 2 has a tubular structure and is made of a material with high thermal conductivity, such as copper or aluminum tubing. The outer diameter of the hollow mold 2 matches the inner diameter of the positioning sleeve, and the hollow mold 2 is inserted into the positioning sleeve. The positioning sleeve also has positioning through holes, and the hollow mold 2 has corresponding positioning pin holes. When the positioning pin holes are aligned with the positioning through holes, the hollow mold 2 can be fixed to the positioning sleeve by the positioning pins. The hollow mold 2 is arranged horizontally during use.

[0049] One end of the hollow mold 2 is connected to the ice-water mixture contained inside the shell 11 via a water inlet pipe 4. A pump 5 is also installed on the shell 11. In this embodiment, the pump 5 is preferably a peristaltic pump. The water inlet pipe 4 passes through the pump head of the pump 5. When the pump 5 is working, it continuously supplies ice-water to the hollow mold 2, allowing the ice-water to flow through the hollow inner hole of the mold 2 and then flow out from the other end, replenishing the shell 11. A filter screen is also installed at the water inlet end of the water inlet pipe 4 to prevent the pump 5 from sucking in ice from the ice-water mixture.

[0050] Pump 5 specifically includes a pump head and a driver for driving the pump head. The driver is fixedly mounted on one side of the outer wall of the housing, while the pump head extends into the interior of the housing 11 after passing through it. If necessary (e.g., when the pump head is heavy), the pump head can be fixed to the inner wall of the housing 11, and then the input end of the driver is connected to the pump head after passing through the housing 11. This arrangement can prevent the heat emitted by the driver during operation from affecting the ice-water mixture. Of course, in other preferred embodiments, pump 5 can also be independent of the magnetic shielding device. The pipeline for conveying the ice-water mixture can be connected to pump 5 after passing through the magnetic shielding device. Typically, the sidewall of the pipeline located outside the magnetic shielding device is also covered with insulation material.

[0051] In the multilayer structure obtained in step S7, the thickness of the composite adhesive layer should not be too thick or too thin. Too thick a layer will result in too few overlapping layers at the predetermined thickness (i.e., the wall thickness of the outer shell), while too thin a layer will result in too many overlapping layers. Therefore, a composite adhesive layer thickness of 0.2-1 mm is preferable, and in this embodiment, a composite adhesive layer thickness of 0.25 mm is preferred. It is also easy to understand that in the multilayer structure obtained in step S7, the thickness of several composite adhesive layers is configured to be approximately the same, such as... Figure 3 As shown. The aramid fiber layer is a single-layer fiber structure formed by winding aramid fibers along the axial direction. The diameter of the aramid fibers is configured to be 0.1 mm, therefore the thickness of the aramid fiber layer is also 0.1 mm. Furthermore, in this embodiment, the thickness of the multilayer structure obtained in step S7 (i.e., the wall thickness of the final prepared shell) is 10 mm.

[0052] It is easy to understand that when the aramid fiber is wound, the aramid fiber will be embedded in the composite adhesive layer because the composite adhesive layer has not yet cured.

[0053] In step S8, the curing time of the multi-layer structure obtained in step S7 is 24-48 hours. The specific curing time depends on the number and thickness of the composite adhesive layers in the multi-layer structure. Usually, the required shell can be obtained after curing for 48 hours. In addition, it can be removed if the surface does not deform when pressed, but it still needs to be used after 48 hours.

[0054] The mechanical properties of the shell (10mm wall thickness) prepared by the above steps are as follows: tensile strength 70MPa, Rockwell hardness 90, and breaking strength 1000Kg / cm. 3 It has a pressure resistance depth of 9000m.

[0055] In contrast, the mechanical properties of a traditional shell (10mm thick) made solely of resin adhesive are as follows: tensile strength 20.33MPa, Rockwell hardness 70, and breaking strength 200Kg / cm². 3 The pressure resistance depth is 200m.

[0056] It is evident that the shell prepared according to the method provided in the embodiments of the present invention has higher tensile strength, hardness, fracture strength and pressure resistance depth, thereby meeting the requirements for use in deep-sea environments.

[0057] Example 2

[0058] A deep-sea magnetometer comprising a shell prepared according to the method provided in Example 1.

[0059] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A method for manufacturing the outer shell of a deep-sea magnetometer, characterized in that, The method includes the following steps: The container containing the resin glue was placed in liquid nitrogen for cooling. Once the resin has cooled to 0°C, transfer the container to an ice-water mixture. Add boron with a final mass of 0.8‰-1.2‰ to the resin adhesive in the container, stir evenly, and form a composite adhesive; The container is then transferred to a vacuum device for vacuuming. When there are no air bubbles in the composite adhesive in the container, transfer the container to an ice-water mixture for later use. Take a hollow mold with ice water circulating inside; The composite adhesive is applied evenly to the surface of the hollow mold alternately, and aramid fibers are wound evenly to form a multi-layer structure in which the composite adhesive layer and the aramid fiber layer alternate. The innermost and outermost layers of the multi-layer structure are both composite adhesive layers. Maintain the circulation of ice water inside the hollow mold until the multi-layer structure solidifies to obtain a shell for a deep-sea magnetometer. During the curing process of the multi-layer structure, the hollow mold and the ice-water mixture flowing inside it are magnetically shielded by a magnetic shielding device.

2. The method according to claim 1, characterized in that: The mass percentage of boron in the composite adhesive is 1‰.

3. The method according to claim 1, characterized in that: The magnetic shielding device includes a shielding shell made of permalloy material. The shielding shell includes a shell and a cover that are detachably connected to each other. The shell contains an ice-water mixture. The hollow mold is fixed in the shell by a bracket. One end of the hollow mold is connected to the ice-water mixture contained in the shell through a water inlet pipe. A pump is also installed on the shell and connected in series in the water inlet pipe.

4. The method according to claim 3, characterized in that: The magnetic shielding device also includes an insulation layer covering the outside of the shielding shell, the insulation layer being made of insulation material.

5. The method according to claim 3, characterized in that: The pump includes a pump head and a motor, wherein the pump head is fixedly installed on one side of the inner wall of the housing, and the motor is fixedly installed on one side of the outer wall of the housing.

6. The method according to claim 1, characterized in that: In the multilayer structure, the thickness of the composite adhesive layer is 0.2-1 mm, the thickness of the aramid fiber layer is 0.1 mm, and the aramid fiber layer is a single layer of aramid fiber.

7. The method according to claim 6, characterized in that: The thickness of the multi-layer structure is 10 mm.

8. The method according to claim 1, characterized in that: The curing time for the multi-layer structure is 24-48 hours.

9. The method according to claim 1, characterized in that: The container is made of a material with high thermal conductivity.

10. A deep-sea magnetometer, characterized in that: Includes a shell prepared according to the method of any one of claims 1-9.

Images