Submarine cable bending limiting structure with damage early warning device

Abstract

The invention provides a submarine cable bending limiting structure with a damage early warning device, and particularly relates to the technical field of ocean engineering. The structure wraps the outer surface of a submarine cable to be protected and comprises a plurality of unit limiters which are sequentially connected end to end. Each unit limiter is formed by splicing two limiting single bodies which are internally provided with cable through holes and are symmetrical about the central axis; each limiting single body comprises a female head part, a male head part and a neck locking part; the female head part and the male head part are positioned at two ends of the neck locking part; the outer surface of the female head part is of a semicircular convex surface structure; a semicircular concave surface structure is arranged on the inner surface of the male head part, the concave surface structure of the male head part wraps the convex surface structure of the adjacent female head part, and a gap exists between the concave surface structure and the convex surface structure, so that the female head part can rotate in the male head part; the neck locking part of each limiting single body is provided with an injury early warning device. The submarine cable damage early warning device is compact in structure and convenient to install, the position of the damage limiter can be found in time through the damage early warning device, and possible damage risks of the submarine cable can be found in time.

Description

Technical Field

[0001] The invention patent relates to the field of marine engineering technology, and specifically to a submarine cable bending limiting structure with a damage warning device. Background Art

[0002] With the development and utilization of marine resources, the application of submarine cables is becoming more and more extensive. During the laying and operation of submarine cables, they will be affected by various factors such as water flow, waves, and changes in seabed topography, and are prone to bending and deformation. In serious cases, the insulation layer of the submarine cable will be damaged, the internal wire will be broken, and other faults will be caused, affecting the normal transmission function of the submarine cable and even causing the failure of the entire marine power or communication system.

[0003] As an important protective component of submarine cables, bend limiters play a key role in preventing excessive bending of cables. However, due to the complex and harsh submarine environment, such as undercurrents, marine biological activities, geological disasters and other factors, bend limiters may be damaged; once the bend limiter is damaged, if it is not discovered and repaired in time, it may cause the bending radius of the submarine cable to be too small, and then damage the insulation layer, conductor and other structures of the cable, affecting the normal power transmission function of the cable, and even causing power outages, resulting in huge economic losses and energy supply interruptions.

[0004] Traditional submarine cable bend limiters usually take the form of cylindrical discontinuous components nested inside each other outside the submarine cable. The working principle is that when the bending force on the submarine cable reaches a certain curvature, the bend limiter locks at the connection and protects the submarine cable by providing additional bending stiffness. However, the marine environment is extremely complex and in a dynamic state. Submarine cables are frequently subjected to long-term, alternating bending forces, especially extreme loads such as typhoons, which can damage and destroy the submarine cable bend limiters and cause them to fail. However, due to the structure and working characteristics of the connection parts of traditional bend limiters, they lack effective buffering or resistance capabilities when facing such extreme bending forces, and are difficult to meet the all-round protection needs of submarine cables in complex marine environments.

[0005] Therefore, it is of great significance to design a bend limiter that can timely and effectively detect the possible damage risk of submarine cables. Summary of the invention

[0006] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a submarine cable bending limiting structure with a damage warning device, and the specific technical solution is as follows: A submarine cable bending limiting structure with a damage warning device is wrapped around the outer surface of a submarine cable to be protected, and comprises a plurality of unit limiters connected end to end in sequence; each of the unit limiters is formed by splicing two limiting monomers with cable through holes provided therein and symmetrical about the central axis; each of the limiting monomers comprises a female head, a male head and a neck locking portion; the female head and the male head are located at both ends of the neck locking portion; the outer surface of the female head is a semicircular convex structure; the inner surface of the male head is provided with a semicircular concave structure, the concave structure of the male head wraps the convex structure of the adjacent female head inside with a gap, so that the female head can rotate inside the male head; the neck locking portion of each limiting monomer is provided with a damage warning device.

[0007] Preferably, a semi-circular locking boss is provided on the side of the surface of the neck locking portion close to the female head; the end face of the locking boss close to the female head is inclined to form a locking surface; the inclination angle of the locking surface is determined according to the maximum curvature of the submarine cable; a structural concession is provided in the middle of the locking boss; a vacuum glass tube is preset in the locking boss; both ends of the vacuum glass tube are in a closed state; a trigger mounting tube with both ends in an open state is provided on the side of the middle of the vacuum glass tube facing the structural concession, and the trigger mounting tube is connected to the inner cavity of the vacuum glass tube.

[0008] Preferably, the damage warning device includes an automatic inflation device and a diaphragm pressure normally closed spring striker trigger; the automatic inflation device is clamped in the structural yield of the locking boss; the outer surface of the diaphragm pressure normally closed spring striker trigger is covered with a rubber sealing sleeve and then inserted into the trigger mounting tube, and is connected to the automatic inflation device by connecting the trigger mounting tube.

[0009] Preferably, the diaphragm pressure normally closed spring striker trigger includes a cylindrical shell, an elastic diaphragm, a push rod and a striker assembly; the striker assembly includes a connecting seat, a striker vertically arranged on the top of the connecting seat, and two symmetrically arranged limit sliders on the left and right; a first magnet with an annular structure is arranged at the bottom of the connecting seat; a pre-stressed spring is sleeved on the outer surface of the connecting seat; the elastic diaphragm is transversely fixed in a position close to the bottom of the inner cavity of the cylindrical shell; a first through hole is arranged at the center of the top plate of the elastic diaphragm; a second through hole is arranged at the center of the top plate of the cylindrical shell, and the second through hole is sealed by paraffin; the inner wall of the cylindrical shell corresponds to the limit slider A slide groove is axially arranged at the position, and the striker slides up and down along the slide groove through a limiting slider; a partition is arranged at a position above the elastic diaphragm in the inner cavity of the column shell, a through hole is arranged in the middle of the partition, and a second magnet with a ring-shaped structure is installed on the top of the through hole; the first through hole, the through hole, the second through hole, the center hole of the first magnet and the center hole of the second magnet are all on the same straight line, and the needle tip of the striker is facing the second through hole; one end of the push rod is fixed to the inner wall of the bottom plate protruding outward of the elastic diaphragm, and the other end passes through the first through hole, the through hole, the center hole of the second magnet, and the center hole of the first magnet in sequence and is fixed to the bottom of the connecting seat.

[0010] Preferably, the outer diameters of the striker and the push rod are the same and are compatible with the inner diameters of the first through hole, the through hole, the second through hole, the center hole of the first magnet and the center hole of the second magnet.

[0011] Also preferably, the automatic inflation device includes a shell adapted to the structural concession, and the inner cavity of the shell is provided with a pre-pressurized airbag, a liquid medicine bin, a solid medicine bin, an airbag bin and a rope storage bin from left to right in sequence; the inflation pressure in the pre-pressurized airbag is 0.3MPa; a liquid medicine bag containing hydrochloric acid solution and ferric chloride solution is provided in the liquid medicine bin; solid sodium bicarbonate powder is provided in the solid medicine bin; a spring sheet sealing plate is provided on the top of the side wall of the solid medicine bin close to the liquid medicine bin; a micro wireless signal is provided on the inner wall of the solid medicine bin away from the limiting monomer transmitter; an airbag with a volume of 80L is arranged in the airbag compartment; a compartment cover is arranged on the side wall of the airbag compartment away from the limiting monomer, and the compartment cover is snap-connected with the outer shell; the air inlet of the airbag is arranged on the side close to the solid medicine compartment and adopts a one-way inflation nozzle; a tether is stored in the rope body storage compartment, and a rope threading hole is arranged on the side wall of the rope body storage compartment away from the airbag compartment, one end of the tether is fixed to the inner wall of the rope body storage compartment, and the other end passes through the rope threading hole and is fixed to the stainless steel tie point embedded in the neck locking part; the second through hole of the column outer shell is opposite to the side wall of the liquid medicine compartment close to the limiting monomer.

[0012] Also preferably, the concentration of the ferric chloride solution in the liquid medicine package is 2 mol / L; the concentration of the hydrochloric acid solution is 10 mol / L, 400-500 ml; and the mass of the sodium bicarbonate in the solid medicine bin is 400-600 g.

[0013] Further preferably, the limiting monomer is an integrally formed structure; the two limiting monomers of each unit limiter are fastened by bolts.

[0014] It is further preferred that the inner diameter of the vacuum glass tube and the trigger mounting tube is 50 mm, and the wall thickness is 5 mm; the outer diameter of the column shell is 45 mm, and the inner diameter is 40 mm; the length of the column shell is less than or equal to the sum of the diameter of the vacuum glass tube and the length of the trigger mounting tube; the length of the tether is at least twice the distance from the unit limiter to which it belongs to the sea surface.

[0015] More preferably, the limiting monomer is made of polyurethane material by injection molding; the shell of the automatic inflation device is made of soft polyurethane material; the tether is made of Kevlar fiber; the airbag is made of neoprene material; and the column shell and the firing pin are made of stainless steel.

[0016] The beneficial effects of the present invention are: 1. The invention has a compact and reasonable structure, and can effectively limit the bending degree of the submarine cable by arranging a locking boss with an inclined end face on the neck locking part; 2. The present invention effectively realizes the connection between the automatic inflation device and the membrane pressure normally closed spring striker trigger by presetting a vacuum glass tube inside the locking boss; 3. The present invention is provided with an automatic inflation device. When the submarine cable limiter is damaged, the airbag can float to the surface of the sea and send an early warning signal to the monitoring device in combination with a micro wireless signal transmitter, so as to timely discover the possible damage risk of the submarine cable and take timely treatment measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting the description of the present invention are used to provide further understanding of the present application and do not constitute improper limitations to the present application.

[0018] Figure 1 It is a schematic diagram of the overall structure of the unit limiter in the present invention; Figure 2 A cross-sectional view of the application process of the present invention; Figure 3 It is a cross-sectional schematic diagram of the installation position of the limiting unit and the damage warning device; Figure 4 It is a schematic diagram of the structure of a vacuum glass tube; Figure 5 It is a structural schematic diagram of the automatic inflation device; Figure 6 It is a schematic diagram of the overall structure of a diaphragm pressure normally closed spring striker trigger; Figure 7 It is a schematic diagram of the structure of the cylindrical housing in the membrane type pressure normally closed spring firing pin trigger; Figure 8 It is a schematic diagram of the structure of the firing pin assembly and the push rod in the diaphragm pressure normally closed spring firing pin trigger; Fig. 9 This is a state diagram of the damage warning device being activated when the limiter is damaged; In the figure, 1-submarine cable; 2-female head; 3-male head; 4-neck locking part; 401-locking boss; 4011-vacuum glass tube; 4012-trigger mounting tube; 402-structural yield; 5-automatic inflation device; 501-pre-pressurized airbag; 502-liquid medicine package; 503-solid medicine bin; 5031-spring sheet sealing plate; 504-airbag bin; 5041-one-way inflation nozzle; 5042-bin cover; 5043-airbag; 505-rope storage bin; 5051- Tether; 506-mini wireless signal transmitter; 6-stainless steel tie point; 7-cylindrical shell; 701-elastic diaphragm; 7011-first through hole; 702-push rod; 7021-first magnet; 703-partition; 7031-through hole; 7032-second magnet; 704-strike pin; 705-connecting seat; 7051-preload spring; 706-limit slider; 707-second through hole; 7071-paraffin; 8-limiter in normal state; 9-limiter in damage warning state. DETAILED DESCRIPTION

[0019] The specific implementation of a submarine cable bending limiting structure with a damage warning device provided by the present invention is further described in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, a submarine cable bending limiting structure with a damage warning device is wrapped around the outer surface of the submarine cable 1 to be protected, including a plurality of unit limiters connected end to end in sequence; each unit limiter is composed of two limiting monomers with cable through holes built in and symmetrical about the central axis.

[0021] Specifically, each limiting monomer includes a female head 2, a neck locking portion 4 and a male head 3 from front to back. The outer surface of the female head 2 is a semicircular convex structure; the inner surface of the male head 3 is provided with a semicircular concave structure, and the concave structure of the male head 3 wraps the convex structure of the female head 2 of the adjacent limiting monomer with a gap, so that the female head 2 can rotate appropriately in the male head 3, thereby achieving the bending degree of the submarine cable 1 within the limited range; a damage warning device is provided on the neck locking portion 4 of each limiting monomer.

[0022] like Figure 2 As shown, a semi-circular locking boss 401 is provided on the outer surface of the neck locking portion 4 near the female head 2; the end surface of the locking boss 401 near the female head 2 is tilted backward and outward to form a locking surface; the inclination angle of the locking surface is determined according to the maximum curvature of the submarine cable 1; when the curvature reaches the maximum curvature, the end surface of the male head 3 near the adjacent limiting monomer locking boss 401 rotates to the locking surface, and the two are locked and bear the bending moment to prevent the submarine cable from continuing to bend to a larger angle. When locked, the bending stress is transmitted in the form of surface contact to avoid the generation of concentrated stress due to uniform force. In addition, the middle part of the locking boss 401 is also provided with a structural clearance 402 for installing the automatic inflation device 5.

[0023] like Figure 3-4 As shown, a vacuum glass tube 4011 is preset in the locking boss 401; a trigger mounting tube 4012 with both ends in an open state is arranged on one side of the middle of the vacuum glass tube 4011 toward the structural yield 402. It is worth noting here that both ends of the vacuum glass tube 4011 are in a closed state. When the unit limiter is not damaged, the vacuum glass tube 4011 will not be damaged and combined with the blocking of the membrane pressure normally closed spring striker trigger, the inside is always in a vacuum state; when the unit limiter is damaged due to external factors (such as impact, erosion by marine organisms or affected by geological changes), weak parts such as the bend of the wall will first undergo brittle fracture and cracks, until the damage is serious and the unit limiter fails at a certain place, the crack runs through the entire wall, and further causes the internal vacuum glass tube 4011 to break under stress, and at this time, seawater will quickly flow into the vacuum glass tube 4011.

[0024] Preferably, the damage warning device includes an automatic inflating device 5 and a diaphragm pressure normally closed spring striker trigger; wherein the automatic inflating device 5 is clamped at the structural yield 402 of the locking boss 401. The outer surface of the diaphragm pressure normally closed spring striker trigger is covered with a rubber sealing sleeve and then inserted into the trigger mounting tube 4012 (the end provided with the elastic diaphragm 701 faces inward), and is connected to the automatic inflating device 5 by connecting the trigger mounting tube 4012.

[0025] like Figure 6 As shown, the diaphragm pressure normally closed spring striker trigger comprises a cylindrical housing 7, an elastic diaphragm 701, a push rod 702 and a striker assembly; Specific as Figure 8 As shown, the striker assembly includes a connecting seat 705, a striker 704 vertically arranged on the top of the connecting seat 705, and two symmetrically arranged limit sliders 706 on the left and right. A first magnet 7021 with an annular structure is arranged at the bottom of the connecting seat 705; a pre-compression spring 7051 is sleeved on the outer surface of the connecting seat 705; like Figure 7 As shown, the elastic diaphragm 701 is transversely fixed in the inner cavity of the column housing 7 and close to the bottom; the top plate of the elastic diaphragm 701 is provided with a first through hole 7011 in the center. It is worth noting that when the unit limiter is not damaged, the bottom plate of the elastic diaphragm 701 bulges outward away from the side of the top plate of the column housing 7. At this time, the push rod 702 does not push the striker 704, and the membrane pressure normally closed spring striker trigger is in an untriggered state. The top plate of the column housing 7 is provided with a second through hole 707 in the center. Preferably, the second through hole 707 is blocked by paraffin 7071. The inner side wall of the column housing 7 is provided with a slide groove along its axial direction corresponding to the position of the limit slider 706, so that the striker 704 can slide up and down along the slide groove through the limit slider 706 and ensure that the striker 704 will not shift during the sliding process; the inner cavity of the column housing 7 is provided with a partition 703 at a position above the elastic diaphragm 701, and a through hole 7031 is provided in the middle of the partition 703, and a second magnet 7032 with an annular structure is installed on the top of the through hole 7031; Preferably, one end of the push rod 702 is fixed to the inner wall of the bottom plate that bulges outward from the elastic diaphragm 701, and the other end passes through the first through hole 7011, the through hole 7031, the center hole of the second magnet 7032, and the center hole of the first magnet 7021 in sequence and then is fixed to the bottom of the connecting seat 705, thereby realizing the connection between the elastic diaphragm 701 and the striker assembly.

[0026] It is worth emphasizing here that the first through hole 7011, the through hole 7031, the second through hole 707, the center hole of the first magnet 7021 and the center hole of the second magnet 7032 are all on the same straight line, and the outer diameters of the striker 704 and the push rod 702 are the same, which are compatible with the inner diameters of the first through hole 7011, the through hole 7031, the second through hole 707, the center hole of the first magnet 7021 and the second magnet 7032, and the needle tip of the striker 704 is facing the second through hole 707 to ensure that the striker 704 can be smoothly pushed out of the second through hole 707, thereby achieving puncture of the liquid medicine package 502.

[0027] like Figure 5 As shown, the automatic inflation device 5 includes a shell adapted to the structural position 402, and the inner cavity of the shell is provided with a pre-pressurized airbag 501, a liquid medicine compartment, a solid medicine compartment 503, an airbag compartment 504 and a rope storage compartment 505 in sequence from left to right; Preferably, the liquid medicine compartment is provided with a liquid medicine bag 502 containing a hydrochloric acid solution and a ferric chloride solution; wherein the concentration of the ferric chloride solution in the liquid medicine bag 502 is 2 mol / L; the concentration of the hydrochloric acid solution is 10 mol / L, 400-500 ml; Preferably, solid sodium bicarbonate powder is arranged in the solid medicine bin 503, wherein the mass of sodium bicarbonate is 400-600g; a spring sheet type sealing plate 5031 is arranged on the top of the side wall of the solid medicine bin 503 close to the liquid medicine bin; a miniature wireless signal transmitter 506 is arranged on the inner wall of the solid medicine bin 503 away from the limiting monomer side, and when the airbag 5043 is inflated and the automatic inflating device 5 is brought out of the sea, the miniature wireless signal transmitter 506 sends an early warning signal, which facilitates the monitoring receiving end to locate the specific location where the damage occurs.

[0028] Preferably, an airbag 5043 with a volume of 80L is arranged in the airbag bin 504; a bin cover 5042 is arranged on the side wall of the airbag bin 504 away from the limiting monomer, and the bin cover 5042 is clamped with the shell, so that when the airbag 5043 is inflated, it is convenient to detach from the inner cavity of the shell. It is worth emphasizing here that the air inlet of the airbag 5043 is arranged on the side close to the solid medicine bin 503 and a one-way inflation nozzle 5041 is used, so that the generated gas can only enter the airbag 5043 from the side of the solid medicine bin 503 without gas leakage, thereby achieving inflation of the airbag 5043.

[0029] The rope storage compartment 505 contains a tether 5051. Preferably, the length of the tether 5051 is at least twice the distance from the position of the unit limiter to which it belongs to the sea surface, so that the airbag 5043 can drive the automatic inflatable device 5 to completely float out of the sea surface. The side wall of the rope storage compartment 505 away from the airbag compartment 504 is provided with a rope threading hole. One end of the tether 5051 is fixed to the inner wall of the rope storage compartment 505, and the other end passes through the rope threading hole and is fixed to the stainless steel tie point embedded on the neck locking part 4, thereby realizing the connection between the automatic inflatable device 5 and the limiting unit.

[0030] In order to ensure that the liquid in the liquid medicine package 502 can be squeezed into the solid medicine chamber 503 and undergo a chemical reaction after being punctured by the firing pin 704 , the inflation pressure in the pre-pressurized airbag 501 is at least 0.3 MPa.

[0031] It is worth noting here that the second through hole 707 of the column housing 7 is directly opposite to the side wall of the liquid medicine bin close to the limiting monomer. When the membrane pressure normally closed spring striker trigger is triggered, the striker 704 just breaks through the paraffin seal of the second through hole 707 and punctures the liquid medicine bag 502 to make the solution inside flow out. Then, through the extrusion of the pre-pressurized airbag 501, the hydrochloric acid and ferric chloride mixed solution is squeezed into the solid medicine bin 503 from the spring sheet sealing plate 5031, and chemically reacts with the solid sodium bicarbonate powder in the solid medicine bin 503 to generate CO2 gas and inflate the airbag 5043. See the following chemical reaction formulas (1)-(2) for details: (1); (2).

[0032] In addition, in order to ensure the service life of the limiter, the limit monomer is made of high-tension, high-tensile force, strong toughness and aging-resistant polyurethane material by integral injection molding; the two limit monomers of each unit limiter are spliced ​​by bolt fastening.

[0033] Further preferably, the inner diameter of the vacuum glass tube 4011 and the trigger installation tube 4012 is 50 mm, and the wall thickness is 5 mm; the outer diameter of the column shell 7 is 45 mm, and the inner diameter is 40 mm; the gap between the two is sealed by a rubber sealing sleeve sleeved on the outside of the column shell 7, so that the vacuum glass tube 4011 is always in a vacuum state when it is not damaged. The length of the column shell 7 is less than or equal to the sum of the diameter of the vacuum glass tube 4011 and the length of the trigger installation tube 4012.

[0034] More preferably, in order to ensure the service life of each component of the present invention and prevent seawater corrosion, the shell of the automatic inflation device 5 is made of soft polyurethane material; the airbag 5043 is made of high-strength, seawater corrosion-resistant and airtight neoprene material; the tether 5051 is made of high-strength Kevlar fiber; the column shell 7 and the striker 704 are both made of stainless steel.

[0035] When the limiting structure provided by the present invention is in normal use without damage, the elastic diaphragm 701 bulges outward, and the push rod 702 connected thereto does not push the striker, and at the same time, the first magnet 7021 at the bottom of the striker 704 and the second magnet 7032 on the partition 703 are in a magnetic attraction state, the preload spring 7051 is in a compressed state, and the striker 704 is located directly below the second through hole 707 and will not pierce into the paraffin 7071; However, when the limiting structure is cracked due to excessive bending of the submarine cable 1, seawater enters from the crack of the limiter and is then injected into the vacuum glass tube 4011. As the seawater pressure increases, the water pressure acts on the elastic diaphragm 701 and pushes the push rod 702 connected thereto to slide toward the second through hole 707. When the pressure reaches a certain threshold, the push rod 702 pushes open the connecting seat 705 to separate the first magnet 7021 and the second magnet 7032. At this time, the preload spring 7051 opens, and the elastic force of the preload spring 7051 and the continued push of the push rod 702 excite the striker 704 to pierce the paraffin 7071 and enter the liquid medicine chamber, and finally pierces the liquid medicine bag 502 containing the mixture of hydrochloric acid and ferric chloride. Furthermore, the mixed liquid flowing out of the liquid medicine bag 502 is squeezed by the pre-pressed airbag 501, so that the mixed liquid pushes open the spring-type sealing plate 5031 and enters the solid medicine bin 503, and reacts chemically with the solid sodium bicarbonate powder in the solid medicine bin 503 to generate a sufficient amount of CO2 gas. When the generated gas pressure reaches a certain level, the one-way inflation nozzle 5041 of the airbag 5043 opens and starts to inflate the airbag 5043, so that the airbag 5043 expands and pushes out the bin cover 5042, and drives the remaining automatic inflation devices 5 to detach from the corresponding limiter and float to the sea surface. At this time, the micro wireless signal transmitter 506 sends a signal warning to the monitoring receiving end to remind the staff to take timely treatment measures. Fig. 9 .

[0036] The present invention has a compact and reasonable structure. By arranging a locking boss with an inclined end face on the neck locking part, the bending of the submarine cable can be effectively restricted. By presetting a vacuum glass tube inside the locking boss, the connection between the automatic inflation device and the membrane pressure normally closed spring striker trigger is effectively realized. By arranging the automatic inflation device, when the submarine cable limiter is damaged, the airbag can float to the surface of the sea and combine with the micro wireless signal transmitter to send an early warning signal to the monitoring device, so that the possible damage risk of the submarine cable can be discovered in time.

[0037] In the present invention, the orientation or position relationship indicated by terms such as "upper", "lower", "bottom", "top", etc. is based on the orientation or position relationship shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationship of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention. Terms such as "connected" and "connected" should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present invention can be determined according to specific circumstances, and they cannot be understood as limitations on the present invention.

[0038] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A submarine cable bending limiting structure with a damage warning device, wrapped around the outer surface of the submarine cable to be protected, characterized in that: It comprises a plurality of unit limiters connected end to end in sequence; each of the unit limiters is formed by splicing two limit monomers with cable through holes inside and symmetrical about the central axis; Each of the limiting monomers comprises a female head, a male head and a neck locking portion; the female head and the male head are located at two ends of the neck locking portion; the outer surface of the female head is a semicircular convex structure; the inner surface of the male head is provided with a semicircular concave structure, the concave structure of the male head wraps the convex structure of the adjacent female head with a gap, so that the female head can rotate inside the male head; The neck locking portion of each limiting unit is provided with an injury warning device.

2. The submarine cable bending limiting structure with damage warning device according to claim 1, characterized in that: A semi-circular locking boss is provided on one side of the neck locking portion surface close to the female head; the end surface of the locking boss close to the female head is inclined to form a locking surface; the inclination angle of the locking surface is determined according to the maximum curvature of the submarine cable; a structural give-way is provided in the middle of the locking boss; a vacuum glass tube is preset in the locking boss; Both ends of the vacuum glass tube are in a closed state; a trigger mounting tube with both ends in an open state is provided on the side of the middle of the vacuum glass tube facing the structure, and the trigger mounting tube is communicated with the inner cavity of the vacuum glass tube.

3. The submarine cable bending limiting structure with damage warning device according to claim 2 is characterized in that: The damage warning device includes an automatic inflation device and a diaphragm pressure normally closed spring striker trigger; The automatic inflation device is clamped at the structural yielding position of the locking boss; the outer surface of the membrane pressure normally closed spring striker trigger is covered with a rubber sealing sleeve and then inserted into the trigger mounting tube, and is connected to the automatic inflation device by connecting the trigger mounting tube.

4. The submarine cable bending limiting structure with damage warning device according to claim 3 is characterized in that: The diaphragm type pressure normally closed spring striker trigger comprises a cylindrical housing, an elastic diaphragm, a push rod and a striker assembly; The striker assembly includes a connecting seat, a striker vertically arranged on the top of the connecting seat, and two symmetrically arranged limit sliders on the left and right; a first magnet with an annular structure is arranged at the bottom of the connecting seat; and a pre-compression spring is sleeved on the outer surface of the connecting seat; The elastic diaphragm is transversely fixed at a position close to the bottom of the inner cavity of the cylindrical shell; a first through hole is provided at the center of the top plate of the elastic diaphragm; A second through hole is provided at the center of the top plate of the cylindrical shell, and the second through hole is sealed by paraffin; a slide groove is axially provided on the inner side wall of the cylindrical shell corresponding to the position of the limit slider, and the striker slides up and down along the slide groove through the limit slider; a partition is provided at a position above the elastic diaphragm in the inner cavity of the cylindrical shell, a through hole is provided in the middle of the partition, and a second magnet with an annular structure is installed on the top of the through hole; The first through hole, the through hole, the second through hole, the center hole of the first magnet and the center hole of the second magnet are all on the same straight line, and the needle tip of the striker faces the second through hole; One end of the push rod is fixed to the inner wall of the bottom plate protruding outward from the elastic diaphragm, and the other end passes through the first through hole, the through hole, the center hole of the second magnet, and the center hole of the first magnet in sequence and is fixed to the bottom of the connecting seat.

5. The submarine cable bending limiting structure with damage warning device according to claim 4, characterized in that: The outer diameters of the striker and the push rod are the same and are compatible with the inner diameters of the first through hole, the through hole, the second through hole, the center hole of the first magnet and the center hole of the second magnet.

6. The submarine cable bending limiting structure with damage warning device according to claim 4, characterized in that: The automatic inflation device comprises a shell adapted to the structural give way, and the inner cavity of the shell is provided with a pre-pressurized air bag, a liquid medicine compartment, a solid medicine compartment, an air bag compartment and a rope body storage compartment from left to right in sequence; The inflation pressure in the pre-compression airbag is 0.3MPa; The liquid medicine compartment is provided with a liquid medicine bag containing hydrochloric acid solution and ferric chloride solution; Solid sodium bicarbonate powder is arranged in the solid medicine bin; a spring sheet sealing plate is arranged on the top of the side wall of the solid medicine bin close to the liquid medicine bin; a micro wireless signal transmitter is arranged on the inner side wall of the solid medicine bin away from the limiting monomer; An airbag with a volume of 80L is arranged in the airbag compartment; a compartment cover is arranged on the side wall of the airbag compartment away from the limiting monomer, and the compartment cover is clamped with the shell; the air inlet of the airbag is arranged on the side close to the solid medicine compartment and adopts a one-way inflation nozzle; A tether is stored in the rope storage compartment, and a tether hole is provided on the side wall of the rope storage compartment away from the airbag compartment. One end of the tether is fixed to the inner wall of the rope storage compartment, and the other end passes through the tether hole and is fixed to a stainless steel tie point pre-buried in the neck locking part; The second through hole of the column shell faces the side wall of the liquid medicine bin close to the limiting monomer.

7. The submarine cable bending limiting structure with damage warning device according to claim 6, characterized in that: The concentration of the ferric chloride solution in the liquid medicine package is 2 mol / L; the concentration of the hydrochloric acid solution is 10 mol / L, 400-500 ml; The mass of sodium bicarbonate in the solid medicine bin is 400-600g.

8. The submarine cable bending limiting structure with damage warning device according to claim 1, characterized in that: The limiting monomer is an integrally formed structure; The two limiting monomers of each unit limiter are fastened by bolts.

9. The submarine cable bending limiting structure with damage warning device according to claim 6, characterized in that: The inner diameter of the vacuum glass tube and the trigger mounting tube is 50 mm, and the wall thickness is 5 mm; The outer diameter of the cylindrical shell is 45 mm, and the inner diameter is 40 mm; The length of the cylindrical shell is less than or equal to the sum of the diameter of the vacuum glass tube and the length of the trigger mounting tube; The length of the tether is at least twice the distance between the location of the unit limiter and the sea surface.

10. The submarine cable bending limiting structure with damage warning device according to claim 6, characterized in that: The limiting monomer is made of polyurethane material by injection molding; the shell of the automatic inflation device is made of soft polyurethane material; the tether is made of Kevlar fiber; the airbag is made of neoprene material; the column shell and the firing pin are both made of stainless steel.

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