Experimental device and method for measuring pressure bearing capacity of submarine cable

Abstract

The invention relates to the technical field of submarine cables, in particular to an experimental device and method for measuring the pressure bearing capacity of a submarine cable and a sleeve. The submarine cable simulation sample is coaxially arranged in the sleeve in a sleeving manner; the enclosure pieces are symmetrically arranged at the two ends of the sleeve and the detection piece for limiting; the device comprises a sleeve, a detection piece and at least one pressurizing piece, the sleeve penetrates through the detection piece to reach the detection piece, the sleeve, the detection piece and a limiting piece jointly form a closed annular detection flow channel, and gradient pressure loads are established in the annular flow channel through the pressurizing pieces to measure the compression resistance of the detection piece. The radial pressure-bearing capacity of the submarine cable under different radial pressure conditions is explored, the accuracy of a measurement result is ensured, an experimental basis is provided for radial pressure design of a first-aid repair joint or a sealing device, and the experimental cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cables, and in particular to an experimental device and method for measuring the pressure bearing capacity of submarine cables. Background Art

[0002] The armor layer of a submarine cable refers to a protective structure wrapped around the outer layer of a submarine cable, which is made of spirally wound copper bars. The armor layer can enhance the mechanical strength of the cable, enabling it to resist external mechanical damage during laying and operation. In addition, the armor layer can also provide a certain degree of tensile and compressive resistance, ensuring that the internal structure of the submarine cable can still maintain normal electrical transmission functions in harsh environments. When a submarine cable is damaged, a repair joint is usually installed for repair, and the control of the radial extrusion force between the repair joint and the submarine cable is a crucial influencing factor. When the extrusion force is too large, the submarine cable may be damaged, and when the radial extrusion force is small, the repair joint and the submarine cable may slip. Therefore, evaluating the radial bearing capacity of the submarine cable and determining the appropriate radial extrusion force between the repair joint and the submarine cable are one of the key indicators to ensure the design of the submarine cable repair joint.

[0003] For oil-filled submarine cables, traditional experimental equipment lacks the experimental conditions for the internal pressure of the submarine cable insulating oil channel, which is different from the actual working conditions of the submarine cable; and when the computer simulates the radial pressure bearing capacity of the submarine cable, its accuracy depends on the precise input of material properties and the rationality of the model assumptions, which may sometimes deviate from the actual situation. Summary of the Invention

[0004] In view of the fact that the above-mentioned existing traditional experimental equipment lacks the experimental conditions for the internal pressure of the insulating oil channel of the submarine cable, which is different from the actual working conditions of the submarine cable; and when the computer simulates the radial pressure bearing capacity of the submarine cable, its accuracy depends on the precise input of material properties and the rationality of the model assumptions, and sometimes there may be deviations from the actual situation, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide an experimental device for measuring the pressure bearing capacity of a submarine cable.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an experimental device for measuring the pressure bearing capacity of a submarine cable, comprising:

[0007] sleeve;

[0008] A test piece, a submarine cable simulation sample coaxially sleeved in the sleeve;

[0009] The blocking parts are symmetrically arranged at both ends of the sleeve and the detection part for limiting the position; and

[0010] At least one pressurizing member passes through the sleeve to the detection member, wherein the sleeve, the detection member and the limiting member together constitute a closed annular detection flow channel, and the pressurizing member establishes a gradient pressure load in the annular flow channel to measure the pressure resistance of the detection member.

[0011] As a preferred solution of the experimental device for measuring the pressure bearing capacity of a submarine cable according to the present invention, there is a pressure member arranged on one radial side of the sleeve.

[0012] As a preferred solution of the experimental device for measuring the pressure bearing capacity of a submarine cable according to the present invention, at least two of the pressure applying members are evenly arranged on one radial side of the sleeve.

[0013] As a preferred embodiment of the experimental device for measuring the pressure bearing capacity of a submarine cable according to the present invention, the test piece comprises a submarine cable simulation sample consisting of an armor layer, a PE sheath, a lead sheath, and an insulation layer, which is installed along the inner wall of the sleeve in a layered order from the outside to the inside;

[0014] Wherein, a first sealing ring is installed on one side of the armor layer, and a second sealing ring is installed on one side of the lead sheath.

[0015] As a preferred solution of the experimental device for measuring the pressure-bearing capacity of submarine cables according to the present invention, the enclosure includes a flange and bolts, and the sleeve and the detection member are positioned by the array-distributed bolts and the flange. A first sealing ring is installed on the inside of the flange, so that the sleeve, the detection member and the limiting member together constitute a closed annular detection flow channel.

[0016] As a preferred solution of the experimental device for measuring the pressure-bearing capacity of a submarine cable according to the present invention, the pressurizing component includes a first injector and a ball valve. The first injector is installed on the sleeve, and the injection end passes through the sleeve to the armor layer of the detection component. The ball valve is used to control the flow rate of the pressurizing agent injected by the first injector.

[0017] As a preferred solution of the experimental device for measuring the pressure bearing capacity of submarine cables of the present invention, it further comprises:

[0018] an inner component, disposed at the axis of the detection component and used to maintain the internal pressure of the simulated submarine cable; and

[0019] The measuring piece passes through the sleeve to the detection piece and is used for real-time monitoring of the pressure in the device.

[0020] As a preferred embodiment of the experimental device for measuring the pressure bearing capacity of a submarine cable according to the present invention, the inner component comprises a core shaft provided in the detection member, one side of the core shaft extends to a portion of the outer surface of the detection member, a shaft cover is installed on the other side of the core shaft, a locking nut is installed on the shaft cover, and a second injector is installed on the core shaft;

[0021] Wherein, an axial flow channel is opened at the axis center of the core shaft, a radial flow channel is opened on one side of the axial flow channel, and a third sealing ring is installed on the shaft cover.

[0022] As a preferred solution of the experimental device for measuring the pressure bearing capacity of a submarine cable of the present invention, the measuring member includes a mounting surface opened on one side of the sleeve, and a pressure sensor is installed on the mounting surface.

[0023] An experimental method for comprehensive verification of sealant performance for oil-filled submarine cables, including an experimental device for measuring the pressure bearing capacity of submarine cables, comprises the following steps:

[0024] The inner component, the detection component and the sleeve are installed in sequence, and then the pressure component and the measuring component are installed at the radial ends of the sleeve respectively to form a complete experimental device;

[0025] By injecting a certain amount of insulating oil into the inner component, the internal pressure of the inner component is stabilized, thereby simulating the internal pressure environment of the submarine cable in actual use;

[0026] Graphite is injected into the device through the pressurizing member, so that the graphite flows in the closed annular detection flow channel formed by the sleeve, the detection member and the limiting member. By controlling the injection amount of graphite, a gradient pressure load is established in the annular flow channel to measure the compressive performance of the detection member;

[0027] The yielding condition of the detection member is observed by controlling the magnitude of the gradient pressure load established by the pressure member in the annular flow channel, thereby completing the experiment of measuring the pressure bearing capacity of the submarine cable.

[0028] The beneficial effects of the present invention are as follows: the device can simulate the internal pressure conditions of the insulating oil channel of the submarine cable, explore the radial pressure bearing capacity of the submarine cable under different radial pressure conditions, ensure the accuracy of the measurement results, provide an experimental basis for the radial pressure design of the emergency joint or sealing device, and reduce the experimental cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] Figure 1 The figure is a schematic diagram of the overall structure of the experimental device for measuring the pressure bearing capacity of submarine cables according to the present invention.

[0031] Figure 2 For attachment Figure 1 Schematic diagram of the enlarged structure of part A.

[0032] Figure 3 The figure is a schematic diagram of the structure of the pressure component of the experimental device for measuring the pressure bearing capacity of the submarine cable according to the present invention.

[0033] Figure 4 This is a schematic diagram of another installation structure of the pressure member of the experimental device for measuring the pressure bearing capacity of a submarine cable according to the present invention.

[0034] Figure markings: 1. Sleeve; 2. Detection part; 21. Armor layer; 211. First sealing ring; 22. PE sheath; 23. Lead sheath; 231. Second sealing ring; 24. Insulation layer; 3. Enclosure; 31. Flange; 32. Bolt; 4. Pressurized part; 41. First injector; 42. Ball valve; 5. Inner part; 51. Core shaft; 511. Axial flow channel; 512. Radial flow channel; 52. Shaft cover; 521. Third sealing ring; 53. Locking nut; 54. Second injector; 6. Measuring part; 61. Mounting surface; 62. Pressure sensor. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it constitute a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0039] Example 1

[0040] Reference Figure 1 - Figure 2, which is the first embodiment of the present invention, provides an experimental device for measuring the pressure-bearing capacity of a submarine cable, the device comprising a sleeve 1; a detection member 2, a submarine cable simulation specimen coaxially sleeved in the sleeve 1; a retaining member 3, symmetrically arranged at both ends of the sleeve 1 and the detection member 2 for limiting; and at least one pressurizing member 4 passing through the sleeve 1 to the detection member 2, wherein the sleeve 1, the detection member 2 and the limiting member together constitute a closed annular detection flow channel, and a gradient pressure load is established in the annular flow channel by the pressurizing member 4 to measure the compressive performance of the detection member 2.

[0041] Specifically, the test piece 2 includes a submarine cable simulation sample consisting of an armor layer 21, a PE sheath 22, a lead sheath 23, and an insulation layer 24. The test piece 2 is installed along the inner wall of the sleeve 1 in a layered order from the outside to the inside. The PE sheath 22 has elasticity and deforms with the extrusion force, thereby transmitting the extrusion force to the contacting and non-extrusion side.

[0042] A first sealing ring 211 is fixedly installed on one side of the armor layer 21 for sealing the end face of the armor layer 21 , and a second sealing ring 231 is fixedly installed on one side of the lead sheath 23 for sealing the end face of the lead sheath 23 .

[0043] Furthermore, the enclosure 3 includes a flange 31 and bolts 32, and the sleeve 1 and the detection member 2 are positioned by the array-distributed bolts 32 and the flange 31. A first sealing ring 211 is installed on the inner side of the flange 31, and a first sealing ring 211 is fixedly installed between the flange 31 and the armor layer 21, so that the sleeve 1, the detection member 2 and the limiting member together constitute a closed annular detection flow channel, that is, the sleeve 1, the armor layer 21 and the flange 31 together constitute a closed annular detection flow channel, and the annular flow channel is a sealed cavity, and objects can flow in the sealed cavity until they are evenly distributed along the circumferential direction.

[0044] Furthermore, the pressurizing part 4 includes a first injector 41 and a ball valve 42. The first injector 41 is fixedly mounted on the sleeve 1, and the injection end passes through the sleeve 1 to the armor layer 21 of the detection part 2. The ball valve 42 is used to control the flow rate of the pressurizing agent injected by the first injector 41. Graphite is injected through the first injector 41 at the ball valve 42. Graphite has excellent elasticity and can fill the armor layer 21, so that the armor layer 21 forms a closed space, and flows along the sleeve 1, the armor layer 21 and the flange 31 to form a closed annular detection flow channel, and flows in the annular flow channel until it is evenly distributed along the circumferential direction. The amount of graphite injected makes the pressure load in the annular flow channel different.

[0045] During the operation, first, the sleeve 1, the detection part 2 (including the armor layer 21, the PE sheath 22, the lead sheath 23 and the insulation layer 24) and the enclosure 3 (the flange 31 and the bolt 32) are installed in sequence to form a closed annular detection flow channel. Then, the first injector 41 is controlled by the ball valve 42 to inject graphite, so that the graphite flows in the annular flow channel and is evenly distributed along the circumferential direction. At the same time, a gradient pressure load is established in the flow channel. Finally, the yield of the lead sheath 23 in the detection part 2 is observed under different pressure conditions to complete the compressive performance measurement.

[0046] Example 2

[0047] Reference Figure 3 , which is a second embodiment of the present invention, provides an experimental device for measuring the pressure-bearing capacity of a submarine cable. This device has a pressure member 4 arranged on one radial side of a sleeve 1, and graphite injected into the pressure member 4 is evenly distributed along the circumferential direction.

[0048] Among them, a ball valve 42 and a first injector 41 are installed on the radial side of the sleeve 1 of the entire device. The first injector 41 needs to inject a certain amount of graphite into the closed annular detection flow channel formed by the sleeve 1, the armor layer 21 and the flange 31.

[0049] During operation, by opening the ball valve 42 on the first injector 41 on one side of the sleeve 1, graphite begins to be injected into the closed annular detection flow channel formed by the sleeve 1, the armor layer 21 and the flange 31 until it is evenly distributed along the circumference of the armor layer 21.

[0050] Example 3

[0051] Reference Figure 4 , which is the third embodiment of the present invention, provides an experimental device for measuring the pressure-bearing capacity of a submarine cable. This device has at least two pressure members 4 evenly arranged on one radial side of a sleeve 1. Two or more pressure members 4 are installed on one radial side of the sleeve 1, and graphite is injected simultaneously at different radial directions of the sleeve 1.

[0052] Specifically, two or more pressurizing members 4 are installed at the radial position of the sleeve 1, so that two or more ball valves 42 and first injectors 41 are installed on one radial side of the sleeve 1. Several first injectors 41 need to inject less graphite than only one first injector 41, so the time for graphite to flow into the closed annular detection flow channel formed by the sleeve 1, the armor layer 21 and the flange 31 is also reduced.

[0053] During the operation, by opening the ball valves 42 on several first injectors 41 with different radial directions on one side of the sleeve 1, graphite starts to be injected into the closed annular detection flow channel jointly formed by the sleeve 1, the armored layer 21 and the flange 31 from different directions until it flows into the circumferential direction of the armored layer 21 along the circumferential direction of the armored layer 21 through multi-directional channels.

[0054] Embodiment 4

[0055] Refer to Figure 1 - Figure 2 This is the fourth embodiment of the present invention, which provides an experimental device for measuring the pressure-bearing capacity of submarine cables. This device includes an internal component 5 arranged at the axis of the detection component 2 to maintain the internal pressure of the simulated submarine cable; and a measuring component 6 penetrating through the sleeve 1 to the detection component 2 to monitor the pressure inside the device in real time.

[0056] Specifically, the internal component 5 includes a core shaft 51 arranged inside the detection component 2. One side of the core shaft 51 extends to the outer surface of a part of the detection component 2. The core shaft 51 is embedded in the insulating layer 24 of the detection component 2 in a shape similar to an umbrella. The cross-section of the core shaft 51 is a "T" - shaped structure. The "-" part of the core shaft 51 can block a part of the detection component 2, that is, the insulating layer 24 and a part of the lead sheath 23. A second sealing ring 231 is fixedly installed between the "-" part of the core shaft 51 and the lead sheath 23. An end cover 52 is installed on the other side of the core shaft 51. The "|" part of the core shaft 51 passes through one end of the insulating layer 24 and penetrates through the end cover 52, so that the core shaft 51 and the end cover 52 are slidably connected. The end cover 52 and the "-" part of the core shaft 51 are symmetrically arranged to抵住 the other side of the detection component 2. A locking nut 53 is installed on the end cover 52, and the end cover 52 and the locking nut 53 are threadedly connected. A second injector 54 is installed on the core shaft 51. The second injector 54 is fixedly connected to the center of the "-" part of the core shaft 51 to facilitate injecting insulating oil into the "|" part of the core shaft 51;

[0057] Among them, an axial flow channel 511 is opened at the axis of the core shaft 51. A radial flow channel 512 is opened on one side of the axial flow channel 511. The insulating oil flows into the axial flow channel 511 through the second injector 54 and then to the radial flow channel 512, and then penetrates from the radial flow channel 512 into the insulating layer 24 to maintain the internal pressure in the lead sheath 23. A third sealing ring 521 is installed on the end cover 52. The core shaft 51 cover with the sealing ring of the lead sheath 23 is installed on the core shaft 51, and the core shaft 51 and the end cover 52 are locked by the locking nut 53 to seal the end face of the lead sheath 23.

[0058] Furthermore, the measuring component 6 includes an installation surface 6 on one side of the sleeve 1, a pressure sensor 62 installed on the installation surface 61, and the pressure sensor 62 is fixedly connected to the installation surface 61. The pressure sensor 62 is used to monitor the radial pressure-bearing capacity of the detection component 2.

[0059] During the operation, first install the sleeve 1, the test piece 2 (including the armor layer 21, the PE sheath 22, the lead sheath 23 and the insulating layer 24) and the enclosure 3 (the flange 31 and the bolt 32) in sequence to form a closed annular test flow channel. Then, the core shaft 51 of the inner component 5 is installed in the insulating layer 24 of the test piece 2. The experimental structure of the entire device is completed by the locking nut 53 and the shaft cover 52. Insulating oil is injected into the core shaft 51 through the second injector 54. The insulating oil penetrates into the insulating layer 24 through the axial flow channel 511 and the radial flow channel 512 of the core shaft 51, and the internal pressure is maintained in the lead sheath 23. Then Graphite is injected into the armor layer 21 through the first injector 41. The graphite flows in the annular flow channel and is evenly distributed along the circumferential direction. At the same time, a gradient pressure load is established. The pressure sensor 62 monitors the radial pressure bearing capacity of the detection part 2 in real time. Finally, under the limitation of the internal shape of the detection part 2 by the inner component 5 and the limitation of the external shape of the detection part 2 by the sleeve 1, the yielding of the lead sheath 23 in the detection part 2 is observed under different pressure conditions. If the armor layer 21 in the detection part 2 yields, it will bulge along both sides of the center line of the core shaft 51, which is convenient for directly observing whether the detection part 2 is deformed and completing the pressure resistance measurement.

[0060] Example 5

[0061] In a fifth embodiment of the present invention, an experimental method for comprehensively verifying the performance of a sealant for an oil-filled submarine cable is provided, specifically comprising the following steps:

[0062] S1. Install the inner component 5, the detection component 2, and the sleeve 1 in sequence, and then install the pressure component 4 and the measuring component 6 at the radial ends of the sleeve 1 to form a complete experimental device;

[0063] S2. By injecting a certain amount of insulating oil into the inner component 5 to stabilize the internal pressure of the inner component 5, the internal pressure environment of the submarine cable in actual use is simulated;

[0064] S3. Injecting graphite into the device through the pressure member 4 so that the graphite flows in the closed annular detection flow channel formed by the sleeve 1, the detection member 2, and the limiting member. By controlling the injection amount of graphite, a gradient pressure load is established in the annular flow channel to measure the compressive performance of the detection member 2;

[0065] S4. By controlling the pressure member 4 to establish a gradient pressure load in the annular flow channel, the yielding of the detection member 2 is observed to complete the experiment of measuring the pressure bearing capacity of the submarine cable. The experimental record is shown in Table 1.

[0066] Table 1 Yield of lead sheath under different radial pressures

[0067]

[0068]

[0069] During the operation, the inner component 5 (core shaft 51) is installed at the axis center of the detection component 2. The detection component 2 includes an armor layer 21, a PE sheath 22, a lead sheath 23 and an insulating layer 24, which are installed in the sleeve 1 in sequence. The "T" structure design of the core shaft 51 enables it to be stably embedded in the insulating layer 24 and is sealed with the end face of the lead sheath 23 through the second sealing ring 231. The shaft cover 52 is installed on the other side of the core shaft 51 and is fixed to the core shaft 51 by a locking nut 53 to ensure the sealing of the end face of the lead sheath 23; the pressure component 4 (the first injector 41 and the ball valve 42) and the measuring component 6 (the pressure sensor 62) are respectively installed at the radial ends of the sleeve 1. The pressure component 4 is used to inject graphite into the device, and the measuring component 6 is used to monitor the radial pressure bearing capacity of the detection component 2 in real time;

[0070] A certain amount of insulating oil is injected into the core shaft 51 via the second injector 54. The insulating oil penetrates the insulation layer 24 along the axial and radial channels 511, 512 of the core shaft 51, maintaining a stable internal pressure within the lead sheath 23, simulating the internal pressure environment of a submarine cable in actual use. The first injector 41, controlled by the ball valve 42, injects graphite into the armor layer 21. The graphite flows through the closed annular test channel formed by the sleeve 1, the test piece 2, and the limiting member, and is evenly distributed along the circumference. By controlling the injection rate of graphite, a gradient pressure load is established within the annular channel, which is used to measure the compressive performance of the test piece 2. The pressure sensor 62 monitors the radial pressure bearing capacity of the test piece 2 in real time and feeds this data back to the control system, ensuring accurate recording of pressure changes during the experiment. Under different pressure conditions, the yield of the lead sheath 23 in the test piece 2 is observed. By recording the deformation and failure modes of the test piece 2 under different pressures, its compressive performance and sealing effectiveness are evaluated.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An experimental device for measuring the pressure bearing capacity of a submarine cable, characterized by: include, Sleeve (1); A testing piece (2), a submarine cable simulation sample coaxially sleeved in the sleeve (1); The blocking member (3) is symmetrically arranged at both ends of the sleeve (1) and the detection member (2) for limiting the position; and At least one pressurizing member (4) passes through the sleeve (1) to the detection member (2), wherein the sleeve (1), the detection member (2) and the limiting member together constitute a closed annular detection flow channel, and a gradient pressure load is established in the annular flow channel by the pressurizing member (4) to measure the pressure resistance performance of the detection member (2).

2. The experimental device for measuring the pressure bearing capacity of a submarine cable according to claim 1, characterized in that: One of the pressurizing members (4) is arranged on one radial side of the sleeve (1).

3. The experimental device for measuring the pressure bearing capacity of a submarine cable according to claim 1 or 2, characterized in that: At least two of the pressurizing members (4) are evenly arranged on one radial side of the sleeve (1).

4. The experimental device for measuring the pressure bearing capacity of a submarine cable according to claim 1 or 2, characterized in that: The detection piece (2) includes a submarine cable simulation sample consisting of an armor layer (21), a PE sheath (22), a lead sheath (23) and an insulation layer (24), and is installed along the inner wall of the sleeve (1) in a layered order from the outside to the inside; Wherein, a first sealing ring (211) is installed on one side of the armor layer (21), and a second sealing ring (231) is installed on one side of the lead sheath (23).

5. The experimental device for measuring the pressure bearing capacity of a submarine cable according to claim 4, characterized in that: The enclosure member (3) includes a flange (31) and bolts (32). The sleeve (1) and the detection member (2) are positioned by the array-distributed bolts (32) and the flange (31). A first sealing ring (211) is installed on the inner side of the flange (31), so that the sleeve (1), the detection member (2) and the limiting member together form a closed annular detection flow channel.

6. The experimental device for measuring the pressure bearing capacity of a submarine cable according to claim 5, characterized in that: The pressurizing member (4) comprises a first injector (41) and a ball valve (42); the first injector (41) is mounted on the sleeve (1), and the injection end passes through the sleeve (1) to the armor layer (21) of the detection member (2); the ball valve (42) is used to control the flow rate of the pressurizing agent injected by the first injector (41).

7. The experimental device for measuring the pressure bearing capacity of a submarine cable according to any one of claims 1 to 6, characterized in that: Also includes, an inner component (5) disposed at the axis of the detection component (2) for maintaining the internal pressure of the simulated submarine cable; and The measuring member (6) passes through the sleeve (1) to the detection member (2) and is used for real-time monitoring of the pressure in the device.

8. The experimental device for measuring the pressure bearing capacity of a submarine cable according to claim 7, characterized in that: The inner component (5) includes a core shaft (51) arranged in the detection component (2), one side of the core shaft (51) extends to a portion of the outer surface of the detection component (2), a shaft cover (52) is installed on the other side of the core shaft (51), a locking nut (53) is installed on the shaft cover (52), and a second injector (54) is installed on the core shaft (51); An axial flow channel (511) is provided at the axis center of the core shaft (51), a radial flow channel (512) is provided on one side of the axial flow channel (511), and a third sealing ring (521) is installed on the shaft cover (52).

9. The experimental device for measuring the pressure bearing capacity of a submarine cable according to claim 8, characterized in that: The measuring member (6) comprises a mounting surface (61) opened on one side of the sleeve (1), and a pressure sensor (62) mounted on the mounting surface (61).

10. An experimental method for comprehensive verification of sealant performance for oil-filled submarine cables, characterized by: An experimental device for measuring the pressure bearing capacity of a submarine cable according to any one of claims 8 to 9, comprising , the following steps: The inner component (5), the detection component (2) and the sleeve (1) are installed in sequence, and then the pressure component (4) and the measuring component (6) are installed at the radial ends of the sleeve (1) respectively to form a complete experimental device; By injecting a certain amount of insulating oil into the inner component (5), the internal pressure of the inner component (5) is stabilized, thereby simulating the internal pressure environment of the submarine cable in actual use; Graphite is injected into the device through the pressurizing member (4), so that the graphite flows in a closed annular detection flow channel formed by the sleeve (1), the detection member (2) and the limiting member. By controlling the injection amount of the graphite, a gradient pressure load is established in the annular flow channel, which is used to measure the compressive performance of the detection member (2); By controlling the pressure member (4) to establish a gradient pressure load in the annular flow channel and observing the yielding condition of the detection member (2), an experiment for measuring the pressure bearing capacity of the submarine cable is completed.

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