A reinforced cooling device for the landing section of a step-down and phase-change submarine cable

Abstract

The present invention relates to the technical field of cable cooling, and more specifically, to a device for enhancing the cooling of the landing section of a step-down and phase-change-promoting submarine cable, comprising: an evaporation system, the evaporation system includes a water tank for containing liquid water, and two tank surfaces of the water tank are provided with cable perforations for passing through the submarine cable; an atomization system, the atomization system is installed in the water tank to atomize the liquid water contained in the water tank; a condensation and reflux system, the condensation inlet at the upper end of the condensation and reflux system is connected to the water vapor outlet at the upper end of the water tank to collect and condense the water vapor generated after the floating particles cool and dissipate heat from the submarine cable; an on-line monitoring system, the on-line monitoring system is installed on the water tank to monitor the internal pressure and external pressure of the water tank in real time and reduce and adjust the internal pressure of the water tank.

Description

Technical Field

[0001] The present invention relates to the technical field of cable cooling, and more specifically, to a device for enhancing the cooling of the landing section of a step-down and phase-change-promoting submarine cable. Background Art

[0002] Submarine cables are mainly divided into a submarine section, an onshore landing section, and an air section according to the laying environment. Among them, the heat dissipation condition of the cable in the onshore landing section is the worst, which is the key section restricting the transmission current-carrying capacity of the submarine cable. The submarine cable in the onshore landing section not only restricts the transmission current-carrying capacity, but also when the cable operates under excessive heat for a long time, it will accelerate the insulation aging, reduce the operation life, and increase the possibility of failures such as electrical and thermal breakdowns of the submarine cable. Cooling the submarine cable in the onshore landing section can, to a certain extent, improve the transmission capacity of the cable line.

[0003] At present, the cooling of the landing section of submarine cables in engineering is mainly carried out by laying cooling water pipes near the onshore landing section of the submarine cable, using special backfill soil, removing the armor of the submarine cable in the onshore landing section, etc. to improve the current-carrying capacity of the onshore landing section of the submarine cable.

[0004] The main problem with the method of laying cooling water pipes near the onshore landing section of the submarine cable is that the landing section is often remote. Laying cooling water pipes requires building an independent water source and monitoring the water level and water volume of the cooling water in real time. The operation and maintenance of the cooling water pipes are difficult, and high requirements are imposed on the power supply and equipment of the cooling water pump.

[0005] The material cost of using the special backfill soil method is too high, and the cooling effect is limited. The method of removing the armor of the submarine cable will reduce the protection ability of the submarine cable.

[0006] There are also some forced water cooling devices whose principles are similar to the above water cooling methods. They require continuous energy supply from a water pump, resulting in high cost consumption. Moreover, once the water pump is damaged, the device will not be able to work, and the operation and maintenance cost is relatively high. Summary of the Invention

[0007] The present invention can effectively overcome the defects existing in the above-mentioned prior art, and proposes a device for cooling the landing section of a submarine cable by a method of step-down and phase-change-promoting enhanced heat transfer.

[0008] To at least partially solve the above problems, the present invention provides a device for enhancing the cooling of the landing section of a step-down and phase-change-promoting submarine cable, including:

[0009] Evaporation system, the evaporation system includes a water tank for containing liquid water, and there are cable perforations for passing through submarine cables on two tank surfaces of the water tank; an atomization system, which is installed in the water tank to atomize the liquid water contained in the water tank, so as to cool and dissipate heat from the submarine cable passing through the cable perforation through the floating particles obtained by atomization; the atomization system is used to atomize the liquid water in the water tank, improve the phase change efficiency of the liquid water, and thus improve the cooling efficiency of the device; the water vapor in the evaporation system absorbs the heat generated by the submarine cable, undergoes a phase change, and is converted into water vapor;

[0010] Condensation and reflux system, the condensation inlet at the upper end of the condensation and reflux system is connected to the water vapor outlet at the upper end of the water tank to collect and condense the water vapor generated after the floating particles cool and dissipate heat from the submarine cable; the condensation outlet at the lower end of the condensation and reflux system is connected to the liquid water inlet at the lower end of the water tank to enable the liquid water generated after the water vapor condensation treatment to flow back into the water tank;

[0011] Online monitoring system, which is installed on the water tank to monitor the internal pressure and external pressure of the water tank in real time and reduce and adjust the internal pressure of the water tank.

[0012] The online monitoring system includes:

[0013] Oxygen concentration sensor to monitor the oxygen concentration inside the water tank;

[0014] Pressure sensors, at least two pressure sensors are provided to monitor the internal pressure and external pressure of the water tank in real time;

[0015] Normally closed solenoid valve, which is installed in the exhaust port at the top of the water tank to discharge the internal gas of the water tank and reduce the internal pressure of the water tank.

[0016] Among them, the oxygen concentration sensor is used to monitor the oxygen concentration in real time. When the present invention works, liquid water undergoes a phase change to generate water vapor, and the pressure sensors are used to monitor the internal and external pressure difference of the water tank in real time. When the oxygen concentration is higher than the threshold and the internal and external pressure difference is higher than 100 Pa, the normally closed solenoid valve opens to discharge the gas in the water tank. When the internal and external pressure difference drops below 50 Pa, the pressure sensors close, so that the internal pressure of the water tank decreases, the partial pressure of the non-condensable gas decreases, and the boiling point of the liquid water drops. The system is used to enhance the cooling efficiency of the present invention; the water vapor generated by the phase change of the liquid water in the water tank has a density smaller than that of air and will float above the water tank. When the normally closed solenoid valve opens, the water vapor will be preferentially discharged from the device; when the pressure rises, the dissolved oxygen concentration in the water decreases, so that when the pressure in the water tank rises, the oxygen concentration also rises.

[0017] The two cable perforations are located at the central positions of the two tank surfaces of the water tank.

[0018] The two cable perforations are oppositely arranged on the front and rear side surfaces or the left and right side surfaces of the water tank.

[0019] The height position of the cable perforation is higher than the height position of the liquid water surface contained in the water tank.

[0020] A first communication hole is provided on the side surface of the water tank, and the height position of the first communication hole is higher than the height position of the cable perforation; the first communication hole is connected to the condensation inlet at the upper end of the condensation reflux system.

[0021] A second communication hole is provided on the side surface of the water tank, and the height position of the second communication hole is lower than the height position of the cable perforation; the second communication hole is connected to the condensation outlet at the lower end of the condensation reflux system.

[0022] The condensation reflux system includes a cooling pipe. One end pipe orifice of the cooling pipe is connected and communicated with the first communication hole, and the other end pipe orifice of the cooling pipe is connected and communicated with the second communication hole. The cooling pipe is used to liquefy the water vapor generated in the evaporation system and transfer the heat to the outside at the same time.

[0023] The cooling pipe is of a C-shaped pipe structure.

[0024] Radiating fins are provided on the outer pipe surface of the cooling pipe.

[0025] A plurality of cooling pipes are equidistantly connected to two opposite side surfaces of the water tank.

[0026] The plurality of cooling pipes are arranged along the axial direction of the cable perforation.

[0027] The atomization system includes: piezoelectric ultrasonic vibrators arranged in an array on the inner bottom surface of the water tank to atomize the liquid water in the water tank through the piezoelectric ultrasonic vibrators. The piezoelectric ultrasonic vibrators are made of two piezoelectric wafers and a resonance plate, with a simple structure and low energy consumption required, and the energy obtained from the energy recovery system is sufficient for its normal operation.

[0028] The energy recovery system includes: a transmission device, a power generation device and a high-frequency circuit; the transmission device includes a fan blade rotatably fitted in the cooling pipe and a support connecting rod with one end fixed to the fan blade. The middle part of the support connecting rod is rotatably and sealingly fitted on the pipe wall of the cooling pipe, and the other end of the support connecting rod is drivingly connected to the input shaft of the power generation device. The power generation device is electrically connected to the atomization system and the on-line monitoring system through the high-frequency circuit to convert the mechanical energy generated by the operation of the transmission device into electrical energy and supply power to the atomization system and the on-line monitoring system. The energy recovery system is used to absorb the mechanical energy generated during the operation of the present invention and convert the mechanical energy into electrical energy to provide energy for the water phase change cycle of the present invention, realizing self-power supply.

[0029] The fan blade is arranged at the interface of the cooling pipe and the first communication hole.

[0030] The described enhanced cooling device for the landing section of a step-down and phase-change submarine cable further includes a cable limiting device; a cable limiting device is connected in a mating manner within each cable perforation; the cable limiting device includes a hexagonal mounting plate, a rotating sleeve, a friction drive ring, a friction linkage wheel, a transmission screw, and a limiting mechanism; the hexagonal mounting plate is fixed on the inner side of the water tank by a plurality of bolts, a circular through-hole is provided at the center of the hexagonal mounting plate, the rotating sleeve is rotatably connected in a sealed manner within the circular through-hole, the middle of the rotating sleeve is rotatably connected in a sealed manner within the cable perforation, a screwing block is provided at the outer end of the rotating sleeve, a friction drive ring is fixed at the inner end of the rotating sleeve, the friction drive ring is vertically and frictionally connected to three friction linkage wheels, the three friction linkage wheels are fixedly connected to three transmission screws respectively, the three transmission screws are evenly and rotatably connected to the inner side of the hexagonal mounting plate, and the axis of the transmission screw is perpendicular to the axis of the rotating sleeve; the three transmission screws are in threaded mating connection with three limiting mechanisms respectively, and the three limiting mechanisms are connected within the three inner and outer sliding channels of the hexagonal mounting plate.

[0031] The limiting mechanism includes a displacement slider, a movable sliding plate, a first bracket, a roller press wheel, an inclined connecting rod, a second bracket, a guiding shaft, an arc-shaped pressing block, and a buffer compression spring; the displacement slider is slidably fitted within the limiting chute on the inner side of the hexagonal mounting plate, the displacement slider is fixedly connected to the movable sliding plate that slides within the inner and outer sliding channels of the hexagonal mounting plate, one end of the first bracket is fixedly connected to the outer end of the movable sliding plate, a bracket sliding channel for slidably mating with the second bracket is provided at the other end of the first bracket, the inner end of the second bracket is rotatably connected to one end of the inclined connecting rod, and the other end of the inclined connecting rod is rotatably connected to the hexagonal mounting plate; the inner end of the first bracket is rotatably connected to the roller press wheel; two guiding shafts are slidably fitted on the second bracket, and the axis of the guiding shaft is perpendicular to the axis of the rotating sleeve; the inner ends of the two guiding shafts are fixedly connected to the arc-shaped pressing block, the limiting rings at the outer ends of the two guiding shafts are blocked on the second bracket, and a buffer compression spring is sleeved on the shaft body of the guiding shaft between the second bracket and the arc-shaped pressing block.

[0032] The beneficial effects of the present invention:

[0033] An enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to the present invention has better energy-saving effects compared with traditional forced cooling methods. The device is sleeved outside the submarine cable and has a simple structure. Considering the complexity and randomness of the laying environment of the submarine cable during transportation and landing, it can achieve efficient and safe cooling effects. Compared with previous cooling devices, it has a broader application prospect. Water is used as the liquid working medium of the device, which can be directly obtained, has rich water resources, and low cost, and can continuously provide coolant for the device. An on-line monitoring system is provided inside. The on-line monitoring system is installed on the water tank to monitor the internal and external pressures of the water tank in real time and reduce and adjust the internal pressure of the water tank. During operation, liquid water undergoes a phase change to generate water vapor. A pressure sensor is used to monitor the internal and external pressure difference of the water tank in real time. When the oxygen concentration is higher than the threshold and the internal and external pressure difference is higher than 100 Pa, a normally closed solenoid valve opens to discharge the gas inside the water tank. When the internal and external pressure difference drops below 50 Pa, the pressure sensor closes, reducing the internal pressure of the water tank, lowering the partial pressure of non-condensable gases, and decreasing the boiling point of liquid water, effectively improving the cooling efficiency of the present invention.

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0036] Figure 1 is a schematic structural diagram of the present invention;

[0037] Figure 2 is a schematic connection diagram of each system in the cross-section of the present invention;

[0038] Figure 3 is a schematic structural diagram of the energy recovery system of the present invention;

[0039] Figure 4 is a schematic diagram of the water phase change cycle of the present invention;

[0040] Figure 5 is a working flow chart of the on-line monitoring system of the present invention;

[0041] Figure 6 is a schematic structure of the cable limiting device provided by the embodiment of the present invention Figure 1 ;

[0042] Figure 7 is a schematic structure of the cable limiting device provided by the embodiment of the present invention Figure 2 ;

[0043] Figure 8 The structural schematic diagram of the limiting mechanism provided by the embodiment of the present invention.

[0044] Icons: atomization system 1; piezoelectric ultrasonic vibrator 11; evaporation system 2; water tank 21; cable perforation 211; first communication hole 212; second communication hole 213; condensation reflux system 3; cooling pipeline 31; energy recovery system 4; transmission device 41; power generation device 42; fan blade 411; support connecting rod 412; high-frequency circuit 43; on-line monitoring system 5; cable limiting device 6; hexagonal mounting plate 61; rotating sleeve 62; friction drive ring 63; friction linkage wheel 64; transmission screw 65; limiting mechanism 66; displacement slider 661; movable slide plate 662; first bracket 663; roller press wheel 664; inclined connecting rod 665; second bracket 666; guide shaft 667; arc-shaped pressing block 668; buffer compression spring 669. Detailed implementation manners

[0045] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0047] It should be understood that the terms such as "having", "including" and "comprising" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0048] The following combines the attached Figure 1-8 The present invention will be further described in detail.

[0049] As Figure 1-8 shown, a stepped-down and phase-transition-promoting enhanced cooling device for the landing section of a submarine cable according to the present invention includes:

[0050] An evaporation system 2, the evaporation system 2 includes a water tank 21 for containing liquid water, and two tank surfaces of the water tank 21 are provided with cable perforations 211 for passing through the submarine cable;

[0051] An atomization system 1, the atomization system 1 is installed in the water tank 21 to atomize the liquid water contained in the water tank 21, so as to cool and dissipate heat from the submarine cable passing through the cable perforation 211 through the floating particles obtained by atomization; the atomization system 1 is used for the liquid water in the atomization system to improve the phase transition efficiency of the liquid water, thereby improving the cooling efficiency of the device;

[0052] A condensation reflux system 3, the condensation inlet at the upper end of the condensation reflux system 3 is connected to the water vapor outlet at the upper end of the water tank 21 to collect and condense the water vapor generated after the floating particles cool and dissipate heat from the submarine cable; the condensation outlet at the lower end of the condensation reflux system 3 is connected to the liquid water inlet at the lower end of the water tank 21, so that the liquid water generated after the condensation treatment of the water vapor flows back into the water tank 21;

[0053] An on-line monitoring system 5 is installed on the water tank 21 to monitor the internal pressure and external pressure of the water tank 21 in real time and reduce and regulate the internal pressure of the water tank 21.

[0054] In the working process of the submarine cable landing section of the pressure-reducing and phase-change-promoting submarine cable landing section strengthening cooling device of the present invention, the circuit is connected, the atomization system 1 breaks water into a mist of micron-sized tiny floating particles, and the mist sprays and moves towards the submarine cable in the water tank 21. When the submarine cable landing section is working, the outer surface temperature is very high and a large amount of heat is released. The mist near the submarine cable in the water tank 21 absorbs heat energy and undergoes a primary phase change, converting from liquid water to water vapor. The density of water vapor is less than that of air, so it continues to rise. When it reaches the upper end interface of the condensation reflux system 3, it enters the condensation reflux system 3 under the action of air pressure. A small part of the water vapor has cooled and phase-changed into liquid water at the upper part of the condensation reflux system 3. When the water vapor and liquid water at the upper end of the condensation reflux system 3 reach the inside of the condensation reflux system 3, they fall under the action of gravity. Due to the thin wall of the condensation reflux system 3, the water vapor and liquid water are fully condensed therein. When reaching the lower end interface of the condensation reflux system 3, they have all been converted into liquid water. The condensation reflux system 3 is connected to the water tank 21. Finally, the liquid water formed by the secondary phase change flows back into the water tank 21 to complete the water phase change heat cycle of the device; an on-line monitoring system is provided inside the present invention. The on-line monitoring system is installed on the water tank 21 to monitor the internal pressure and external pressure of the water tank 21 in real time and reduce and regulate the internal pressure of the water tank 21. When the on-line monitoring system 5 is working, the water vapor in the water tank 21 is discharged from the water tank 21, the internal pressure of the water tank 21 decreases, so the boiling point of the liquid water in the water tank 21 decreases, and thus the liquid water is more likely to undergo a phase change to generate water vapor, thereby further improving the cooling effect of the present invention.

[0055] The on-line monitoring system 5 includes:

[0056] An oxygen concentration sensor to monitor the oxygen concentration inside the water tank 21;

[0057] A pressure sensor, at least two pressure sensors are provided to monitor the internal pressure and external pressure of the water tank 21 in real time;

[0058] The normally closed solenoid valve is installed in the exhaust port at the top of the water tank 21 to discharge the gas inside the water tank 21 and reduce the air pressure inside the water tank 21.

[0059] During operation, water vapor is generated by the phase change of liquid water. The pressure sensor is used to monitor the air pressure difference inside and outside the water tank 21 in real time. When the oxygen concentration is higher than the threshold value and the air pressure difference inside and outside is higher than 100 Pa, the normally closed solenoid valve opens to discharge the gas inside the water tank 21. When the air pressure difference inside and outside drops below 50 Pa, the pressure sensor closes, reducing the air pressure inside the water tank 21, lowering the partial pressure of the non-condensable gas, and decreasing the boiling point of the liquid water, effectively improving the cooling efficiency of the present invention.

[0060] The two cable perforations 211 are located at the central positions of two side surfaces of the water tank 21.

[0061] The two cable perforations 211 are oppositely arranged on the front and back side surfaces or the left and right side surfaces of the water tank 21. The two cable perforations 211 are symmetrically arranged to facilitate the installation of the submarine cable without bending the submarine cable.

[0062] The height position of the cable perforation 211 is higher than the height position of the liquid water surface contained in the water tank 21, preventing the liquid water contained in the water tank 21 from overflowing.

[0063] A first communication hole 212 is provided on the side surface of the water tank 21, and the height position of the first communication hole 212 is higher than the height position of the cable perforation 211; the first communication hole 212 is connected to the condensation inlet at the upper end of the condensation reflux system 3.

[0064] A second communication hole 213 is provided on the side surface of the water tank 21, and the height position of the second communication hole 213 is lower than the height position of the cable perforation 211; the second communication hole 213 is connected to the condensation outlet at the lower end of the condensation reflux system 3.

[0065] The condensation reflux system 3 includes a cooling pipe 31. One end of the cooling pipe 31 is connected and communicated with the first communication hole 212, and the other end of the cooling pipe 31 is connected and communicated with the second communication hole 213.

[0066] The cooling pipe 31 has a C-shaped pipe structure. The C-shaped pipe structure that is symmetric left and right and is arranged at equal intervals along the side surface of the water tank 21 is installed outside the water tank 21 to liquefy the water vapor generated in the evaporation system 2 and transfer the heat to the outside at the same time.

[0067] Heat dissipation fins are provided on the outer pipe surface of the cooling pipe 31, which is beneficial to improving the cooling and heat dissipation effect.

[0068] A plurality of cooling pipes 31 are evenly connected at equal intervals on two opposite side surfaces of the water tank 21.

[0069] The wall of the cooling pipe 31 is thin, and the heat exchange efficiency with the external air is high, ensuring that the water vapor fully undergoes a phase change.

[0070] A third communication hole is provided at the bottom of the water tank 21 for the wire to pass through.

[0071] Multiple cooling pipes 31 are arranged along the axis direction of the cable perforation 211.

[0072] The atomization system 1 includes: piezoelectric ultrasonic vibrators 11 arranged in an array on the inner bottom surface of the water tank 21 to atomize the liquid water in the water tank 21 through the piezoelectric ultrasonic vibrators 11.

[0073] The piezoelectric ultrasonic vibrator 11 is composed of a stainless steel sheet, a piezoelectric ceramic ring, a shock-proof silica gel ring, a front waterproof solder joint, and a back waterproof solder joint, and is used to atomize the liquid water in the atomization device, improve the phase change efficiency of the liquid water, thereby improving the cooling efficiency of the device; compared with other ultrasonic generators, the piezoelectric ultrasonic vibrator 11 has a lower cost, a simple structure, and can achieve its function with only two piezoelectric ceramic rings and a stainless steel sheet, and the required energy consumption is low, and the energy obtained from the energy recovery system is sufficient for its normal operation.

[0074] The submarine cable passes through the two cable perforations 211 at the center of the water tank 21. The main function of the water tank 21 is to conduct the heat generated during the operation of the submarine cable. The upper part inside is air, and the lower part is water. The piezoelectric ultrasonic vibrator 11 is laid on the bottom of the water tank 21 and mainly functions to atomize the water. After the water is atomized to form a water mist with a relatively large gap and is ejected upward and passes through the submarine cable, it is easily evaporated by heat, improving the phase change efficiency of the liquid water, ensuring the efficiency of phase change heat exchange. The cooling pipe 31 cools the water vapor entering it from the water tank 21, ensuring that the water vapor can be effectively cooled and finally liquefied to form liquid water, and the liquid water finally returns to the water tank 21 to realize the phase change heat exchange cycle of water. The designed access landing section length of this device is 3 - 10m.

[0075] The energy recovery system 4 includes: a transmission device 41, a power generation device 42, and a high-frequency circuit 43; the transmission device 41 includes a fan blade 411 rotatably fitted in the cooling pipe 31 and a support connecting rod 412 fixed to one end of the fan blade 411. The middle part of the support connecting rod 412 is rotatably and sealingly fitted on the pipe wall of the cooling pipe 31. The other end of the support connecting rod 412 is drivingly connected to the input shaft of the power generation device 42. The power generation device 42 is electrically connected to the atomization system 1 and the on-line monitoring system 5 through the high-frequency circuit 43 to convert the mechanical energy generated by the operation of the transmission device 41 into electrical energy and supply power to the atomization system 1 and the on-line monitoring system 5.

[0076] The fan blade 411 is arranged at a position of the cooling pipe 31 close to the first communication hole 212.

[0077] In the power generation device 42, an induction generator is arranged. The fan blade 411 is light in mass. When the present invention works, the water vapor drives the fan blade 411 inside to rotate. The rotation of the fan blade 411 drives the support connecting rod 412 to rotate. When the support connecting rod 412 rotates, it drives the input shaft of the power generation device 42 to rotate, thereby converting the mechanical energy generated by the movement of the water vapor into the mechanical energy of the fan blade 411 and finally into the electrical energy of the high-frequency circuit 43, realizing a self-powered cooling method.

[0078] Figure 4 It is a schematic diagram of the water phase change cycle of the present invention. Figure 4 The arrow in it is a schematic diagram of the heat exchange cycle of the phase change of the liquid water inside the water tank 21. When the present invention works in the submarine cable landing section, the high-frequency circuit 43 is turned on, and high-frequency electricity is applied to both ends of the piezoelectric ultrasonic vibrator 11. The piezoelectric ultrasonic vibrator 11 starts to vibrate, breaking the water into micron-sized tiny floating particles. The water mist sprays out and moves towards the submarine cable in the water tank 21. When the submarine cable landing section works, the outer surface temperature is very high and releases a large amount of heat. The water mist near the submarine cable in the water tank 21 absorbs the heat energy and undergoes a primary phase change, converting from liquid water to water vapor. Since the density of water vapor is less than that of air, it continues to rise. When it reaches the upper end interface of the cooling pipe 31, it enters the cooling pipe 31 under the action of air pressure. A small part of the water vapor has cooled and changed into liquid water at the upper part of the cooling pipe 31. When the water vapor and liquid water at the upper end of the cooling pipe 31 reach the inside of the cooling pipe 31, they fall under the action of gravity. Since the wall of the cooling pipe 31 is thin, the water vapor and liquid water are fully condensed inside it. When they reach the lower end interface of the cooling pipe 31, they have all been converted into liquid water. The cooling pipe 31 is connected to the water tank 21. Finally, the liquid water formed by the secondary phase change flows back to the water tank 21, completing the heat exchange cycle of the phase change of the device in the water; as Figure 5 As shown, when the online monitoring system working flowchart works, the liquid water undergoes a phase change to generate water vapor. The air pressure sensor is used to monitor the air pressure difference inside and outside the water tank 21 in real time. When the oxygen concentration is higher than the threshold and the air pressure difference inside and outside is higher than 100 Pa, the normally closed solenoid valve opens to discharge the gas inside the water tank 21. When the air pressure difference drops below 50 Pa, the air pressure sensor closes, reducing the air pressure inside the water tank 21, reducing the partial pressure of the non-condensable gas, and lowering the boiling point of the liquid water, effectively improving the cooling efficiency of the present invention.

[0079] The described enhanced cooling device for the landing section of a step-down and phase-change submarine cable further includes a cable limiting device 6; one cable limiting device 6 is fitted and connected in each cable through-hole 211; the cable limiting device 6 includes a hexagonal mounting plate 61, a rotating sleeve 62, a friction drive ring 63, a friction linkage wheel 64, a drive screw 65, and a limiting mechanism 66; the hexagonal mounting plate 61 is fixed to the inner side surface of the water tank 21 by a plurality of bolts, a circular through-hole is provided at the center of the hexagonal mounting plate 61, the rotating sleeve 62 is sealingly and rotatably connected in the circular through-hole, the middle part of the rotating sleeve 62 is sealingly and rotatably connected in the cable through-hole 211, a screwing block is provided at the outer end of the rotating sleeve 62, the friction drive ring 63 is fixed to the inner end of the rotating sleeve 62, the friction drive ring 63 is vertically and frictionally connected to three friction linkage wheels 64, the three friction linkage wheels 64 are fixedly connected to three drive screws 65 one by one, the three drive screws 65 are evenly and rotatably connected to the inner side surface of the hexagonal mounting plate 61, and the axis of the drive screw 65 is perpendicular to the axis of the rotating sleeve 62; the three drive screws 65 are in threaded fit connection with three limiting mechanisms 66 one by one, and the three limiting mechanisms 66 are connected in the three inner and outer sliding channels of the hexagonal mounting plate 61.

[0080] The described enhanced cooling device for the landing section of a step-down and phase-change submarine cable further includes a cable limiting device 6; two cable limiting devices 6 can be installed inside the present invention to provide a more stable support connection for the contact points between the two ends of the cable and the box body 21. The hexagonal mounting plate 61 inside the cable limiting device 6 can be fixed to the inner side surface of the water tank 21 by a plurality of bolts. The middle part of the rotating sleeve 62 is sealingly and rotatably connected in the cable through-hole 211. The inner side of the rotating sleeve 62 is used for passing through the submarine cable. After passing through the submarine cable, it can be clamped on the submarine cable by a plurality of limiting mechanisms 66 to achieve the stable fixation of the submarine cable. When it is necessary to clamp the submarine cable or release the clamping state, it is controlled by rotating the rotating sleeve 62. Rotating the rotating sleeve 62 can drive the friction drive ring 63 to rotate. When the friction drive ring 63 rotates, it can frictionally drive the three friction linkage wheels 64 to rotate. When the three friction linkage wheels 64 rotate, they drive the three drive screws 65 to rotate. When the three drive screws 65 rotate, they can change their contact positions with the three limiting mechanisms 66, thereby driving the three limiting mechanisms 66 to perform sliding movements in the inner and outer directions in the three inner and outer sliding channels of the hexagonal mounting plate 61, and finally achieving clamping or releasing the clamping of the submarine cable.

[0081] The limiting mechanism 66 includes a displacement slider 661, a movable slide plate 662, a first bracket 663, a roller 664, an inclined connecting rod 665, a second bracket 666, a guide shaft 667, an arc-shaped pressing block 668 and a buffer compression spring 669; the displacement slider 661 is slidably fitted in the limiting chute on the inner side of the hexagonal mounting plate 61, the displacement slider 661 is fixedly connected to the movable slide plate 662 that slides in the inner and outer slideways of the hexagonal mounting plate 61, one end of the movable slide plate 662 is fixedly connected to one end of the first bracket 663, the other end of the first bracket 663 is provided with a bracket slideway that slidably cooperates with the second bracket 666, the inner end of the second bracket 666 is rotatably connected to one end of the inclined connecting rod 665, and the other end of the inclined connecting rod 665 is rotatably connected to the hexagonal mounting plate 61; the inner end of the first bracket 663 is rotatably connected to the roller 664; two guide shafts 667 are slidably fitted on the second bracket 666, and the axis of the guide shaft 667 is perpendicular to the axis of the rotating sleeve 62; the inner ends of the two guide shafts 667 are fixedly connected to the arc-shaped pressing block 668, and the limit rings at the outer ends of the two guide shafts 667 are blocked on the second bracket 666, and a buffer compression spring 669 is sleeved on the shaft body of the guide shaft 667 between the second bracket 666 and the arc-shaped pressing block 668.

[0082] When the limiting mechanism 66 is in use, the displacement slider 661 inside it can slide in the limiting chute on the inner side of the hexagonal mounting plate 61 driven by the transmission screw 65, thereby driving the movable slide plate 662 to perform a sliding movement in the inner and outer directions in the inner and outer slideways of the hexagonal mounting plate 61, and further driving the first bracket 663 and the second bracket 666 to move in the inner and outer directions. The first bracket 663 drives the roller 664 to roll on the submarine cable, and the second bracket 666 drives the arc-shaped pressing block 668 to press tightly on the submarine cable. As the pressing amplitude increases, when the first bracket 663 gradually moves towards the axis of the rotating sleeve 62, the included angle between the second bracket 666 and the inclined connecting rod 665 gradually becomes larger, thereby pushing the second bracket 666 to move outward in the bracket slideway at the other end of the first bracket 663 through the inclined connecting rod 665, that is, controlling the second bracket 666 to move towards the center of the water tank 21, so as to expand the distance between the roller 664 and the arc-shaped pressing block 668 and improve the stability of its support for the submarine cable; a plurality of buffer compression springs 669 are provided between the arc-shaped pressing block 668 and the second bracket 666, which can play a buffering role and reduce the probability of damage when the submarine cable moves around, while ensuring a certain range of movement of the submarine cable and ensuring the relative fixation of the submarine cable; the setting of the roller 664 effectively supports the submarine cable without affecting the pulling of the submarine cable.

[0083] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0084] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the examples shown and described herein.

Claims

1. A reinforced cooling device for the landing section of a step-down and phase-change submarine cable, characterized in that, Including: An evaporation system (2), the evaporation system (2) includes a water tank (21) for containing liquid water, and cable through-holes (211) for passing through submarine cables are provided on two side surfaces of the water tank (21); An atomization system (1), the atomization system (1) is installed in the water tank (21) to atomize the liquid water contained in the water tank (21), so as to cool and dissipate heat from the submarine cable passing through the cable through-hole (211) through the floating particles obtained by atomization; A condensation and reflux system (3), the condensation inlet at the upper end of the condensation and reflux system (3) is connected to the water vapor outlet at the upper end of the water tank (21) to collect and condense the water vapor generated after the floating particles cool and dissipate heat from the submarine cable; the condensation outlet at the lower end of the condensation and reflux system (3) is connected to the liquid water inlet at the lower end of the water tank (21) to enable the liquid water generated after the water vapor condensation treatment to flow back into the water tank (21); An on-line monitoring system (5), the on-line monitoring system (5) is installed on the water tank (21) to monitor the internal pressure and external pressure of the water tank (21) in real time and reduce and regulate the internal pressure of the water tank (21).

2. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 1, characterized in that, The on-line monitoring system (5) includes: An oxygen concentration sensor to monitor the oxygen concentration inside the water tank (21); A pressure sensor, at least two pressure sensors are provided to monitor the internal pressure and external pressure of the water tank (21) in real time; A normally closed solenoid valve is installed in the exhaust port at the top of the water tank (21) to discharge the internal gas of the water tank (21) and reduce the internal pressure of the water tank (21).

3. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 1, wherein, The two cable through-holes (211) are located at the central positions of two side surfaces of the water tank (21).

4. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 3, characterized in that, The two cable through-holes (211) are oppositely arranged on the front and rear side surfaces or the left and right side surfaces of the water tank (21).

5. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 4, characterized in that, The height position of the cable through-hole (211) is higher than the height position of the liquid water surface contained in the water tank (21).

6. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 5, characterized in that, A first communication hole (212) is provided on the side surface of the water tank (21), and the height position of the first communication hole (212) is higher than the height position of the cable through-hole (211); the first communication hole (212) is connected to the condensation inlet at the upper end of the condensation and reflux system (3).

7. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 6, wherein, A second communication hole (213) is provided on the side surface of the water tank (21), and the height position of the second communication hole (213) is lower than the height position of the cable through-hole (211); the second communication hole (213) is connected to the condensation outlet at the lower end of the condensation and reflux system (3).

8. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 7, characterized in that, The condensation and reflux system (3) includes a cooling pipe (31), one end pipe orifice of the cooling pipe (31) is connected and communicated with the first communication hole (212), and the other end pipe orifice of the cooling pipe (31) is connected and communicated with the second communication hole (213).

9. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 8, characterized in that, The cooling pipe (31) is of a C-shaped pipe structure.

10. A reinforced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 8, characterized in that, Radiating fins are provided on the outer pipe surface of the cooling pipe (31).

11. A reinforced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 8, characterized in that, A plurality of cooling pipes (31) are evenly connected to two opposite side surfaces of the water tank (21); the plurality of cooling pipes (31) are arranged along the axial direction of the cable through-hole (211).

12. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 8, wherein It further includes an energy recovery system (4), and the energy recovery system (4) includes: a transmission device (41), a power generation device (42), and a high-frequency circuit (43); the transmission device (41) includes a fan blade (411) rotatably fitted in the cooling pipe (31) and a support connecting rod (412) with one end fixed to the fan blade (411), the middle of the support connecting rod (412) is sealingly and rotatably fitted on the pipe wall of the cooling pipe (31), the other end of the support connecting rod (412) is drivingly connected to the input shaft of the power generation device (42), and the power generation device (42) is electrically connected to the atomization system (1) and the on-line monitoring system (5) through the high-frequency circuit (43) to convert the mechanical energy generated by the operation of the transmission device (41) into electrical energy and supply power to the atomization system (1) and the on-line monitoring system (5).

13. A reinforced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 12, characterized in that, The fan blade (411) is arranged at the interface between the cooling pipe (31) and the first communication hole (212).

14. A reinforced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 1, characterized in that, The atomization system (1) includes: piezoelectric ultrasonic vibrators (11) arranged in an array on the inner bottom surface of the water tank (21) to atomize the liquid water in the water tank (21) through the piezoelectric ultrasonic vibrators (11).

15. The enhanced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 1, characterized in that, It further includes a cable limiting device (6); one cable limiting device (6) is fitted and connected in each cable through-hole (211); the cable limiting device (6) includes a hexagonal mounting plate (61), a rotating sleeve (62), a friction driving ring (63), a friction linkage wheel (64), a driving screw (65), and a limiting mechanism (66); the hexagonal mounting plate (61) is fixed to the inner side surface of the water tank (21) by a plurality of bolts, a circular through-hole is provided at the center of the hexagonal mounting plate (61), the rotating sleeve (62) is sealingly and rotatably connected in the circular through-hole, the middle of the rotating sleeve (62) is sealingly and rotatably connected in the cable through-hole (211), a screwing block is provided at the outer end of the rotating sleeve (62), the friction driving ring (63) is fixed to the inner end of the rotating sleeve (62), the friction driving ring (63) is vertically and frictionally drivingly connected to three friction linkage wheels (64), the three friction linkage wheels (64) are fixedly connected to the three driving screws (65) one by one, the three driving screws (65) are evenly and rotatably connected to the inner side surface of the hexagonal mounting plate (61), and the axis of the driving screw (65) is perpendicular to the axis of the rotating sleeve (62); the three driving screws (65) are threadedly fitted and connected to the three limiting mechanisms (66) one by one, and the three limiting mechanisms (66) are connected in the three inner and outer sliding channels of the hexagonal mounting plate (61).

16. A reinforced cooling device for the landing section of a step-down and phase-change submarine cable according to claim 15, characterized in that, The limiting mechanism (66) includes a displacement slider (661), a movable slide plate (662), a first bracket (663), a roller (664), an inclined connecting rod (665), a second bracket (666), a guide shaft (667), an arc-shaped pressing block (668), and a buffer compression spring (669); the displacement slider (661) is slidably fitted in the limiting chute on the inner side of the hexagonal mounting plate (61), the displacement slider (661) is fixedly connected to the movable slide plate (662) that slides in the inner and outer slideways of the hexagonal mounting plate (61), one end of the movable slide plate (662) is fixedly connected to one end of the first bracket (663), the other end of the first bracket (663) is provided with a bracket slideway that slidably cooperates with the second bracket (666), the inner end of the second bracket (666) is rotatably connected to one end of the inclined connecting rod (665), and the other end of the inclined connecting rod (665) is rotatably connected to the hexagonal mounting plate (61); the inner end of the first bracket (663) is rotatably connected to the roller (664); two guide shafts (667) are slidably fitted on the second bracket (666), and the axis of the guide shaft (667) is perpendicular to the axis of the rotating sleeve (62); the inner ends of the two guide shafts (667) are fixedly connected to the arc-shaped pressing block (668), the limiting rings at the outer ends of the two guide shafts (667) are blocked on the second bracket (666), and a buffer compression spring (669) is sleeved on the shaft body of the guide shaft (667) between the second bracket (666) and the arc-shaped pressing block (668).

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