A model pipe cable system capable of accurately measuring the forces on a submarine pipe cable

Abstract

This invention belongs to the technical field of subsea pipeline structure stress and in-situ stability. It discloses a model pipeline system capable of accurately measuring the stress on subsea pipelines. The system has a symmetrical structure and includes a model pipeline body, end support structures, a two-dimensional total force sensor measurement assembly, a dynamic pressure measurement sensor, a maintenance window for the model pipeline system, fixed tie rods, and a pressure sensor mounting body. The pressure sensor mounting body is located between the two model pipeline bodies. This invention can highly integrate various sensors into the same model pipeline testing system, greatly improving experimental testing efficiency. Furthermore, this invention enables simultaneous measurement of the hydrodynamic forces and soil resistance experienced by the model pipeline, making research on the in-situ stability of subsea pipelines a practical possibility.

Description

Technical Field

[0001] This invention belongs to the technical field of submarine cable structure stress and in-situ stability, and relates to a model cable system that can accurately measure the stress on submarine cables. Background Technology

[0002] Submarine pipeline structures are widely used in marine resource development, encompassing oil and gas transportation, underwater production system communication and control, submarine communications, and power transmission for clean and renewable energy sources such as offshore wind power, photovoltaic power generation, and wave energy. These projects are extremely costly. Taking offshore oil and gas resource development as an example, submarine pipelines are often referred to as "energy arteries," accounting for 40% to 50% of the total project investment, and this cost is increasing year by year.

[0003] Cable structures laid on the seabed are highly susceptible to localized scouring under the influence of fluids, leading to cantilever formation. When the fluid forces acting on the cantilever exceed the soil resistance provided by the seabed, in-situ instability occurs, inducing structural damage and causing significant economic losses, or even irreparable marine environmental disasters. Therefore, accurately obtaining the stress on subsea cables is a crucial prerequisite for in-situ stability design. Currently, laboratory flume or pool experiments can typically only measure the fluid forces acting on the subsea cable structure, namely the horizontal drag force along the flow direction and the lift force perpendicular to the flow direction. Due to limitations in physical experimental conditions and technology, there is currently no feasible method to simultaneously measure the fluid forces and lateral soil resistance acting on the cable during the development of localized scouring. Lateral soil resistance acting on the cable requires separate experiments; however, these separate experiments cannot account for the scouring effect of fluids on the soil in real-world operating environments, nor can they guarantee the temporal synchronization of the hydrodynamic forces and lateral resistance acting on the cable, thus failing to directly support the in-situ stability design of subsea cables. Therefore, there is an urgent need to develop a model cable system that can accurately measure the stress on submarine cables, and to achieve simultaneous measurement of the fluid forces and lateral resistance of the soil on the cable structure. This would lead to an accurate design method for the in-situ stability of submarine cables, thereby serving the safe design of submarine cables and ensuring their safe service. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies and meet the practical needs of submarine cable design and safe service, the objective of this invention is to provide a model cable system capable of accurately measuring the forces acting on submarine cables, enabling real-time, synchronous, and high-precision measurement of fluid forces and lateral soil resistance acting on submarine cables, thereby conducting a safety assessment of the in-situ stability of submarine cable structures.

[0005] The technical solution of this invention:

[0006] A model cable system capable of accurately measuring the stress on submarine cables is a bilaterally symmetrical structure, comprising a model cable body 1, a model cable end support structure 2, a two-dimensional total force sensor measurement component 3, a dynamic pressure measurement sensor 4, a model cable system maintenance window 5, a fixed tie rod 6, and a pressure sensor mounting body 7; the pressure sensor mounting body 7 is located between the two model cable bodies 1.

[0007] The main body 1 of the model cable system forms the skeleton of the model cable system and is used to support the installation of other parts of the model cable system.

[0008] Model cable end support structure 2 is used to connect the model cable system to the top of the experimental water tank;

[0009] Two-dimensional total force sensor measurement component 3 is used to measure the total force on the model cable system, including hydrodynamic and soil resistance.

[0010] Dynamic pressure measurement sensor 4 is used to monitor the external dynamic water pressure information of the model cable system;

[0011] Model cable system maintenance window 5 is mainly used for the maintenance of the model cable system;

[0012] Fixed tie rod 6 enhances the rigidity of the entire model cable system;

[0013] Pressure sensor mount 7 is used to measure the fluid force acting on the model cable system;

[0014] The model cable end support structure 2 is connected to the polyurethane board 8 via a small square pressure plate 13 and an internal hex bolt 17; one side of the two-dimensional total force sensor 9 is connected to the polyurethane board 8 via a large square pressure plate 12 and an internal hex bolt 17; the polyurethane board 8 is a flexible structure to prevent the hydrodynamic force on the model cable end support structure 2 from being transmitted to the two-dimensional total force sensor 9, ensuring the accuracy of the experimental measurement; the other side of the two-dimensional total force sensor 9 is connected to the connecting cover 14, and the connecting cover 14 is connected to the connecting carrier 15 via an internal hex bolt 17. An O-ring seal 10 is provided between the connecting cover 14 and the connecting carrier 15 to prevent water from seeping in from the gap between the connecting cover 14 and the connecting carrier 15 during the experiment; the connecting carrier 15 is connected to the end of the model cable body 1 via a cross bolt 11; one end of the fixed tie rod 6 is connected to the connecting carrier 15, and the entire model cable system is a left-right symmetrical structure, with the other end of the fixed tie rod 6 connected to the connecting carrier 15 at the other end;

[0015] The maintenance window 5 of the model cable system is connected to the main body 1 of the model cable system via a cross bolt 18; the dynamic pressure measurement sensor 4 is connected to the main body 1 of the model cable system via a threaded structure.

[0016] The pressure sensor mounting body 7 mainly consists of a pressure sensor mounting body 19, a water-permeable filter plug 20, a pressure sensor 21, and plastic diaphragm fixing bolts 26. The pressure sensor 21 is threadedly connected to the pressure sensor mounting body 19. The water-permeable filter plug 20 and the pressure sensor mounting body 19 are connected by the plastic diaphragm fixing bolts 26. The pressure sensor mounting body 19 is made of aluminum alloy and requires anodizing treatment to prevent rusting in the aquatic environment. The corresponding cross-section is shown below. Figure 7 As shown. The pressure sensor mounting body 19 has a cylindrical structure with symmetrical ends. Each end has a sealing ring mounting groove 24 for installing a rubber sealing ring, serving a water-stopping function. Both ends of the pressure sensor mounting body 19 are embedded mounting platforms with multiple pressure sensor mounting holes 23 for mounting pressure sensors 21. The circumferential surface of the pressure sensor mounting body 19 has uniformly spaced permeable filter plug mounting holes 27 and permeable filter plug fixing bolt holes 22 for mounting the permeable filter plug 20 and the plastic diaphragm fixing bolts 26. The permeable filter plug 20 is fixed to the surface of the pressure sensor mounting body 19 by the plastic diaphragm fixing bolts 26. The permeable filter plug mounting holes 27, the hollow cavity 25, and the pressure sensor mounting holes 23 are cavities pre-reserved during the machining of the pressure sensor mounting body 19. The hollow cavity 25 provides a pressure transmission channel between the permeable filter plug 20 and the pressure sensor 21. Figure 8 As shown, during the use of the sensor installation body, the upper part of the hollow chamber 25 is covered with a plastic diaphragm 29, and the upper part of the plastic diaphragm 29 is covered with a thin stainless steel sheet 28. Together with the hollow chamber 25, these three components constitute a dynamic water pressure transmission system. The specific connection method between the thin stainless steel sheet 28, the plastic diaphragm 29, and the hollow chamber 25 is as follows... Figure 9 As shown, the thin stainless steel sheet 28 provides an installation carrier for the plastic diaphragm 29; the middle part of the thin stainless steel sheet 28 is a circular hollow structure, the diameter of which is slightly smaller than the diameter of the plastic diaphragm 29. The plastic diaphragm 29 is directly adhered to the thin stainless steel sheet 28 with waterproof adhesive. The thin stainless steel sheet and plastic diaphragm fixing bolts 30 pass through the thin stainless steel sheet and plastic diaphragm fixing bolt holes 31 to fix the thin stainless steel sheet 28 to the hollow cavity 25. The structure of the water-permeable filter plug 20 is as follows. Figure 10 As shown, the permeable filter plug 20 is made of aluminum alloy and is anodized to effectively prevent rusting in the underwater environment. The permeable filter plug 20 has a permeable slit 32, which is a curve with a width of 0.1~0.2mm cut through the axis. The permeable slit 32 can prevent sand from entering the hollow cavity 25 without affecting the water inlet and outlet. The inner surface of the permeable filter plug 20 has a notch 33 to avoid the thin stainless steel sheet and the plastic diaphragm fixing bolts 30.

[0017] Working principle of this invention:

[0018] Once the submarine cable structure is laid to the seabed, localized scouring will occur under the influence of fluids. As this localized scouring progresses, a certain length of cantilever will form. For the cantilever, the support of the seabed soil will be lost, and therefore the cantilevered portion will only be subject to fluid forces. The non-cantilevered portion will be subject to both the lateral resistance of the soil and the fluid forces.

[0019] The fluid forces acting on the submarine cable structure are primarily assessed using high-precision miniature pressure sensors installed at the mid-section of the model cable. Sixteen high-precision miniature pressure sensors are arranged at 22.5° intervals along the circumference of the cable's mid-section. By integrating the pressure along the circumference, the horizontal drag force along the flow direction and the vertical lift force perpendicular to the flow direction can be obtained. The specific calculation formulas are as follows:

[0020]

[0021]

[0022] in, F x ( t )and F y ( t ) represent the horizontal drag force and vertical lift force per unit length of the model cable, which vary with time; L Indicates the length of the model cable; p ( t This represents the time-domain pressure signal obtained by measuring a high-precision miniature pressure sensor. n These are the labels for the pressure sensors; there are a total of 16. D This indicates the diameter of the model cable.

[0023] The total fluid force acting on the model cable system and the lateral resistance exerted by the soil on the model cable can be measured using two-dimensional total force sensors installed at both ends of the cable. Furthermore, the pressure sensors and the two-dimensional total force sensors utilize the same data acquisition system to ensure data synchronization. A single two-dimensional total force sensor can measure the force along half the cable length; therefore, the total force on the cable is a linear superposition of the measurements from the two two-dimensional total force sensors. This sensor is two-dimensional and can simultaneously measure the total force component along the flow direction. F tx ( t and the total force component perpendicular to the direction of the incoming flow. F ty ( t For any total force component, the horizontal component is considered. F tx ( tFor example, the force component includes two parts: 1) the horizontal component of the fluid force. F x ( t ), this component is equal to the force component obtained by integrating the pressure signal measured by the pressure sensor; 2) the lateral resistance component of the soil. F tx-soil ( t ),Right now F tx ( t ) = F x ( t ) + F tx-soil ( t Therefore, by subtracting the horizontal component of the fluid force obtained through pressure integration from the horizontal component measured by the total force sensor, the horizontal component of the soil's resistance can be obtained. The vertical force component acting on the cable is calculated using the same method. Through these steps, the fluid force and soil resistance acting on the cable structure during local scour development can be accurately obtained, enabling in-situ stability design of the submarine cable.

[0024] The beneficial effects of this invention are:

[0025] 1) It can highly integrate various sensors into the same model cable testing system, which can greatly improve the efficiency of experimental testing;

[0026] 2) It can realize the synchronous measurement of hydrodynamic and soil resistance on the model pipeline, making the research on the in-situ stability of submarine pipelines a realistic possibility. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall model cable system for accurately measuring the stress on submarine cables;

[0028] Figure 2 This is a cross-sectional view of a model cable system that allows for accurate measurement of the stress on submarine cables.

[0029] Figure 3 A cross-sectional view showing the connection between the main body of the model cable, the end support structure of the model cable, and the two-dimensional total force sensor measurement system;

[0030] Figure 4 This is a schematic diagram showing the maintenance window of the model cable system and the installation of the dynamic pressure measurement sensor.

[0031] Figure 5 A cross-sectional view showing the maintenance window of the model cable system and the installation of the dynamic pressure measurement sensor;

[0032] Figure 6A schematic diagram of the pressure sensor mounting body;

[0033] Figure 7 A cross-sectional view of the pressure sensor mounting body;

[0034] Figure 8 This is a schematic diagram of the cavity structure;

[0035] Figure 9 This is a schematic diagram of a dynamic water pressure transmission system;

[0036] Figure 10 This is a schematic diagram of a water-permeable filter plug.

[0037] In the diagram: 1. Model cable main body; 2. Model cable end support structure; 3. Two-dimensional total force sensor measurement component; 4. Dynamic pressure measurement sensor; 5. Model cable system maintenance window; 6. Fixed tie rod; 7. Pressure sensor mounting body; 8. Polyurethane board; 9. Two-dimensional total force sensor; 10. O-ring seal; 11. Cross bolt; 12. Large square pressure plate; 13. Small square pressure plate; 14. Connecting cover; 15. Connecting carrier; 16. Nut; 17. Socket head bolt; 18. Cross bolt; 19. Sensor mounting body; 20. Water-permeable filter plug; 21. Pressure sensor; 22. Water-permeable filter plug fixing bolt hole; 23. Pressure sensor mounting hole; 24. Sealing ring mounting groove; 25. Hollow cavity; 26. Plastic diaphragm fixing bolt; 27. Water-permeable filter plug mounting hole; 28. Thin stainless steel sheet; 29. ​​Plastic diaphragm; 30. Thin stainless steel sheet and plastic diaphragm fixing bolt; 31. Thin stainless steel sheet and plastic diaphragm fixing bolt hole; 32. Water-permeable seam; 33. Notch. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] A model cable system capable of accurately measuring the stress on submarine cables mainly consists of a model cable body, a model cable end support structure, a two-dimensional total force sensor measurement component, a dynamic pressure measurement sensor, a model cable system maintenance window, a fixed tie rod, a pressure sensor mounting body, a polyurethane board, and connecting components.

[0040] like Figures 1-2 As shown, the overall structure of the model cable system is symmetrical from left to right. The system includes a model cable body 1 with an outer diameter of 20 cm made of aluminum alloy. The model cable body 1 is the skeleton of the entire model cable system and is used to support the installation of various sensors such as the pressure sensor mounting body 7, the two-dimensional total force sensor measurement component 3, and the dynamic pressure measurement sensor 4.

[0041] like Figures 1-2As shown, the pressure sensor mounting body 7 is located in the middle of the model cable body 1. The model cable body 1 and the pressure sensor mounting body 7 are connected by 16 M5 cross bolts 11 arranged symmetrically on both sides. The 16 pressure sensors arranged axially on the pressure sensor mounting body 7 measure the fluid force on the model cable system.

[0042] like Figures 1-3 As shown, the two sides of the model cable body 1 are connected to two two-dimensional total force sensor measurement components 3 by 16 M5 cross bolts 11 arranged symmetrically. The two-dimensional total force sensor measurement components 3 are used to measure the total force on the model cable system, including hydrodynamic and soil resistance.

[0043] like Figures 1-3 As shown, two symmetrically arranged two-dimensional total force sensor measurement components 3 are connected to the model cable end support structure 2, which is used to connect the entire model cable system to the top of the experimental water tank.

[0044] like Figure 3 As shown, taking the left side of the model cable system as an example, the specific connection methods of the model cable body 1, the two-dimensional total force sensor measurement component 3, and the model cable end support structure 2 are explained. The left side of the model cable body 1 is connected to the connecting carrier 15 via eight M5 cross bolts 11. The connecting carrier 15 is connected to the connecting cover 14 via eight M6 hexagon socket head caps 17. Simultaneously, an O-ring 10 with a width of 6mm and a height of 3mm is placed between the connecting cover 14 and the connecting carrier 15 to prevent water from seeping in through the gap between the connecting cover 14 and the connecting carrier 15 during the experiment. The left side of the connecting cover 14 is connected to the two-dimensional total force sensor 9. The left side of the two-dimensional total force sensor 9 is connected to a polyurethane board 8, and the two are connected via a large square pressure plate 12 with a thickness of 5mm and four M6 hexagon socket head caps 17. The left side of the polyurethane board 8 is connected to the model cable end support structure 2, and the two are connected via two small square pressure plates 13 with a thickness of 5mm arranged symmetrically on top and bottom and four M6 hexagon socket head caps 17. The polyurethane board 8 is a flexible structure, which prevents the hydrodynamic force on the model cable end support structure 2 from being transmitted to the two-dimensional total force sensor 9, thus ensuring the accuracy of the experimental measurement.

[0045] like Figures 1-2 and Figures 4-5 As shown, two symmetrical dynamic pressure measuring sensors 4 are arranged on the main body 1 of the model cable. The dynamic pressure measuring sensors 4 are connected to the main body 1 of the model cable through their own threaded structure to monitor the external dynamic water pressure information of the model cable system.

[0046] like Figures 1-2 and Figures 4-5As shown, two symmetrical maintenance windows 5 for the model cable system are arranged on the main body 1 of the model cable system. Each maintenance window 5 is connected to the main body 1 of the model cable system by 18 cross bolts 18. It is mainly used for maintenance of the model cable system.

[0047] like Figures 2-3 As shown, four fixed tie rods 6 are arranged inside the main body 1 of the model cable system. Each fixed tie rod 6 is connected to the connecting carriers 15 on both sides through its own threaded connecting nut 16, thereby enhancing the rigidity of the entire model cable system.

[0048] like Figures 6-10 As shown, the pressure sensor mounting body proposed in this invention operates underwater. Therefore, to prevent material corrosion caused by long-term underwater operation, the pressure sensor mounting body 19 needs to be made of aluminum alloy and undergo anodizing treatment. During the manufacturing process, the pressure sensor mounting body 19 has three interconnected cavities: a water-permeable filter plug mounting hole 27, a hollow chamber 25, and a pressure sensor mounting hole 23. The maximum outer diameter of the pressure sensor mounting body is 20 cm. Symmetrical sealing ring mounting grooves (as shown in 24) are provided at both ends for installing rubber sealing rings, thus providing a water-stopping function. The height of the mounting grooves is 3.0 mm, and the width is 5.0 mm. The sensor mounting body has a water-permeable filter plug mounting hole 27 with a diameter of 30 mm and a depth of 10.0 mm for installing the water-permeable filter plug. The permeable filter plug 20 has a diameter of 30.0 mm and a depth consistent with the depth of the permeable filter plug mounting hole 27. An M4 plastic diaphragm fixing bolt 26 passes through the permeable filter plug fixing bolt hole 22 to install the permeable filter plug 20 into the permeable filter plug mounting hole 27. The pressure sensor 21 is connected to the pressure sensor mounting body 19. The permeable filter plug 20 is also made of aluminum alloy and anodized to prevent corrosion. A curved permeable slit 32 of 0.1 mm to 0.2 mm is cut axially for water permeation and conduction of dynamic water pressure. Furthermore, a notch 33 is provided on the bottom inner surface of the permeable filter plug 20 to avoid the thinned stainless steel sheet and the plastic diaphragm fixing bolt 30. On both sides of the pressure sensor mounting body 19, pressure sensor mounting holes 23 with a diameter of 18.5 mm are provided at 45° intervals along the circumference. That is, 8 opening structures are provided on the left and right ends of the pressure sensor mounting body 19 for mounting pressure sensor 21. The two adjacent pressure sensor mounting holes 23 on the left and right sides of the pressure sensor mounting body 19 are 15° apart.

[0049] like Figures 6-10As shown, the hollow chamber 25 primarily provides a pressure transmission channel between the water-permeable filter plug 20 and the pressure sensor mounting hole 23. The hollow chamber 25 has a cylindrical structure with a height of 14.8 mm and a diameter of 17.5 mm. A plastic diaphragm 29 is sealed at the top of the hollow chamber 25, and a thin stainless steel sheet 28 is sealed above the plastic diaphragm 29. The thin stainless steel sheet 28, the plastic diaphragm 29, and the hollow chamber 25 together form a dynamic water pressure transmission system, transmitting the dynamic water pressure to the pressure sensor 21, thereby achieving accurate measurement of the dynamic water pressure. The thin stainless steel sheet 28 has a diameter of 29.5 mm and a thickness of 1.0 mm. The thin stainless steel sheet and plastic diaphragm fixing bolts 26 pass through the thin stainless steel sheet and plastic diaphragm fixing bolt holes 31 and are fixed to the hollow chamber 25. The thin stainless steel sheet 28 has a circular hollow structure in the middle with a diameter of 18 mm. The plastic diaphragm 29 also has a circular structure with a diameter of 29 mm and is directly glued to the thin stainless steel sheet 28 with waterproof adhesive.

Claims

1. A model cable system capable of accurately measuring the stress on submarine cables, characterized in that, The model cable system has a symmetrical structure, including the model cable body (1), the model cable end support structure (2), the two-dimensional total force sensor measurement component (3), the dynamic pressure measurement sensor (4), the model cable system maintenance window (5), the fixed tie rod (6), and the pressure sensor mounting body (7); the pressure sensor mounting body (7) is located between the two model cable bodies (1). The main body of the model cable system (1) is the skeleton of the model cable system and is used to support the installation of other parts of the model cable system. Model cable end support structure (2) is used to connect the model cable system to the top of the experimental water tank; Two-dimensional total force sensor measurement component (3) is used to measure the total force on the model cable system, including hydrodynamic and soil resistance; A dynamic pressure measurement sensor (4) is used to monitor the external dynamic water pressure information of the model cable system; The model cable system maintenance window (5) is mainly used for the maintenance of the model cable system; Fixed tie rod (6) to enhance the rigidity of the entire model cable system; Pressure sensor mounting body (7) is used to measure the fluid force on the model cable system; The model cable end support structure (2) is connected to the polyurethane board (8); the two-dimensional total force sensor (9) is connected to the polyurethane board (8) on one side and to the connecting cover (14) on the other side. The connecting cover (14) is connected to the connecting carrier (15). An O-ring (10) is set between the connecting cover (14) and the connecting carrier (15) to prevent water from seeping in through the gap between the connecting cover (14) and the connecting carrier (15) during the experiment. The connecting carrier (15) is connected to the end of the model cable body (1). One end of the fixed tie rod (6) is connected to the connecting carrier (15). The entire model cable system is a left-right symmetrical structure. The other end of the fixed tie rod (6) is connected to the connecting carrier (15) at the other end. The dynamic pressure measurement sensor (4) is connected to the model cable body (1); The maintenance window (5) of the model cable system is located on the main body (1) of the model cable system; Sixteen miniature pressure sensors are arranged at equal intervals of 22.5° along the circumference of the middle section of the model cable body (1). By integrating the pressure along the circumference, the horizontal drag force and vertical lift force perpendicular to the incoming flow direction of the cable are obtained. The total fluid forces acting on the model cable system and the lateral resistance exerted by the soil on the model cable system are measured by two-dimensional total force sensors installed at both ends of the cable. In addition, the pressure sensor and the two-dimensional total force sensor use the same data acquisition system to ensure the synchronization of data acquisition.

2. The model cable system according to claim 1, characterized in that, The pressure sensor mounting body (7) is mainly composed of a sensor mounting body (19), a water-permeable filter plug (20), a pressure sensor (21), and water-permeable filter plug fixing bolts (26). The pressure sensor (21) is connected to the sensor mounting body (19) by threads. The water-permeable filter plug (20) and the sensor mounting body (19) are connected by water-permeable filter plug fixing bolts (26). The sensor mounting body (19) is a cylindrical structure with symmetrical structures at both ends. The ends are provided with sealing ring mounting grooves (24) for installing rubber sealing rings to stop water flow. The two ends of the sensor mounting body (19) are embedded mounting platforms with multiple pressure sensor mounting holes (23) for installing the pressure sensor (21). The circumferential surface of the sensor mounting body (19) has uniform water-permeable filter plug mounting holes (27) and water-permeable filter plug fixing bolts. Hole (22) is used for the installation of the permeable filter plug (20) and the permeable filter plug fixing bolt (26). The permeable filter plug (20) is fixed to the surface of the sensor mounting body (19) by the permeable filter plug fixing bolt (26). The permeable filter plug mounting hole (27), the hollow cavity (25) and the pressure sensor mounting hole (23) are cavities reserved during the processing of the sensor mounting body (19). The hollow cavity (25) provides a pressure transmission channel between the permeable filter plug (20) and the pressure sensor (21). The permeable filter plug (20) has a permeable slit (32), which is a curve with a width of 0.1~0.2mm cut through the axial direction. The permeable slit (32) can prevent sand from entering the hollow cavity (25) without affecting the water inlet and outlet. The inner surface of the permeable filter plug (20) has a notch (33) to avoid the thin stainless steel sheet and the plastic diaphragm fixing bolt (30).

3. The model cable system according to claim 1, characterized in that, During the use of the sensor mounting body (19), the upper part of the hollow chamber (25) is covered with a plastic diaphragm (29), and the upper part of the plastic diaphragm (29) is covered with a thin stainless steel sheet (28). The three constitute a dynamic water pressure transmission system. The thin stainless steel sheet (28) provides a mounting carrier for the plastic diaphragm (29). The middle part of the thin stainless steel sheet (28) is a circular hollow structure. The diameter of the hollow structure is slightly smaller than the diameter of the plastic diaphragm (29). The plastic diaphragm (29) is directly pasted onto the thin stainless steel sheet (28) with waterproof glue. The thin stainless steel sheet and plastic diaphragm fixing bolts (30) pass through the holes (31) of the thin stainless steel sheet and plastic diaphragm fixing bolts to fix the thin stainless steel sheet (28) onto the hollow chamber (25).

4. The model cable system according to claim 1, characterized in that, The sensor mounting body (19) is made of aluminum alloy and requires anodizing to prevent rusting in aquatic environments.

5. The model cable system according to claim 1, characterized in that, The permeable filter plug (20) is made of aluminum alloy and is anodized to effectively prevent rusting in the underwater environment.

Images