Heat dissipation device and heat dissipation method for J-shaped pipe section of submarine cable

Abstract

The invention discloses a heat dissipation device and a heat dissipation method for a J-shaped pipe section of a submarine cable. The heat dissipation device comprises a cable; the J-shaped pipe sleeves the cable, the J-shaped pipe comprises an air section and a seawater section, the air section is higher than the sea surface, and the seawater section is lower than the sea surface; the gravity heat pipe is arranged in the air section and attached to the outer surface of the cable, and the gravity heat pipe can conduct heat with the cable; a heat exchange working medium is loaded in the gravity assisted heat pipe, can evaporate and move upwards when heated, and can condense and move downwards when cooled; and the radiator is connected with the top of the gravity assisted heat pipe and used for transferring cooling capacity to the heat exchange working medium. Local heat exchange is carried out on the cable located at the air section of the J-shaped pipe through the gravity heat pipe, and the influence of high temperature on the cable at the position is relieved; the vertically-arranged cable is subjected to heat exchange and cooling by utilizing the characteristic that the heat exchange medium moves upwards after being heated and evaporated and moves downwards after being cooled and condensed. The invention relates to the technical field of cable heat dissipation.

Description

Technical Field

[0001] The present application relates to the technical field of cable heat dissipation, and in particular to a heat dissipation device and a heat dissipation method for a J-shaped pipe section of a submarine cable. Background Art

[0002] Submarine cables serve as a bridge between offshore wind farms and onshore power grids, and play a role in transmitting and collecting electricity from offshore wind farms. Submarine cables are composed of landing sections, tidal flat sections, seabed sections, and J-shaped pipe sections. The J-shaped pipe section is sheathed on the outside of the cable to protect the cable. The J-shaped pipe section is divided into a platform section, an air section, and a seawater section. The platform section is connected to the offshore platform, the air section is set above the sea surface, and the seawater section is set below the sea surface.

[0003] Unlike the platform section and seawater section where the cables are directly exposed to the wind and seawater, in the air section of the J-shaped tube section, the cables are in a sealed environment with neither air convection nor seawater cooling, resulting in low heat transfer efficiency and poor heat dissipation conditions in the air section, and heat cannot be dissipated in time. Over time, the cable insulation ages faster and its service life is shortened. This phenomenon becomes more serious with the increase of current carrying capacity, making it a bottleneck that limits the safe and stable operation and power transmission capacity of the entire submarine cable.

[0004] Therefore, finding a heat dissipation method for the J-shaped pipe section of the submarine cable is of great significance for the offshore wind power transmission system. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a heat dissipation device for a J-shaped pipe section of a submarine cable, which can efficiently dissipate heat for the air section of the J-shaped pipe section of the submarine cable.

[0006] The present application also proposes a heat dissipation method based on the heat dissipation device of the above-mentioned J-shaped pipe section of the submarine cable.

[0007] According to the first aspect of the present application, a heat dissipation device for a J-shaped pipe section of a submarine cable comprises:

[0008] cable;

[0009] A J-shaped tube, which is sleeved on the outside of the cable, the J-shaped tube includes an air section and a seawater section, the air section is higher than the sea surface, and the seawater section is lower than the sea surface;

[0010] A gravity heat pipe is arranged in the air section and is attached to the outer surface of the cable. The gravity heat pipe can conduct heat with the cable. A heat exchange medium is loaded in the gravity heat pipe. The heat exchange medium can evaporate and move upward when heated, and can condense and move downward when cooled.

[0011] A radiator is connected to the top of the gravity heat pipe and is used to transfer cold energy to the heat exchange medium.

[0012] The heat dissipation device of the J-shaped tube section of the submarine cable according to the embodiment of the present application has at least the following beneficial effects: local heat exchange of the cable located in the air section of the J-shaped tube is carried out through the gravity heat pipe, thereby alleviating the influence of the high temperature here on the cable; the heat exchange and cooling of the vertically arranged cable is carried out by utilizing the characteristics that the heat exchange medium evaporates upward when heated and condenses downward when cooled.

[0013] According to some embodiments of the present application, the gravity heat pipe is arranged along the axial direction of the cable.

[0014] According to some embodiments of the present application, there are at least two gravity heat pipes, each of which is attached to the outer surface of the cable, and the top of each of which is connected to the radiator.

[0015] According to some embodiments of the present application, the gravity heat pipes are distributed in a circular array around the cable.

[0016] According to some embodiments of the present application, the bottom of the gravity heat pipe is higher than the sea surface.

[0017] According to some embodiments of the present application, the radiator includes an air collecting pipe, a liquid collecting pipe and a flow channel, the air collecting pipe is arranged above the liquid collecting pipe, there are multiple flow channels, and both ends of the flow channel are respectively connected to the air collecting pipe and the liquid collecting pipe; the air collecting pipe is connected to the air outlet end of the gravity heat pipe, and the liquid collecting pipe is connected to the liquid inlet end of the gravity heat pipe.

[0018] According to some embodiments of the present application, the heat sink further includes fins, and the fins are multiple in number and installed on the outside of each of the flow channels.

[0019] According to some embodiments of the present application, the heat exchange medium is R134a.

[0020] According to some embodiments of the present application, the pipe material of the gravity heat pipe is a copper pipe.

[0021] According to the heat dissipation method of the second aspect of the present application, the heat dissipation device of the J-shaped pipe section of the submarine cable is performed based on the above-mentioned method, including:

[0022] Install the gravity heat pipe on the surface of the cable, and make sure that the gravity heat pipe is set in the air section of the J-shaped tube;

[0023] The cable starts to generate heat during operation, and the heat exchange medium in the gravity heat pipe evaporates due to the heat, taking away the heat emitted by the cable, and the gaseous heat exchange medium moves upward;

[0024] The gaseous heat exchange medium enters the radiator to condense, and the condensed heat exchange medium returns to the gravity heat pipe in liquid form;

[0025] The liquid heat exchange medium slides to the bottom of the gravity heat pipe due to gravity, and circulates to exchange heat with the cable.

[0026] The heat dissipation method according to the embodiment of the present application has at least the following beneficial effects: the heat exchange medium in the gravity heat pipe is cooled again by the radiator, so that the radiator and the gravity heat pipe together constitute a heat exchange cycle, continuously cooling and dissipating the heat of the cable located in the air section of the J-tube.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide further understanding of the technical solution disclosed in the present application and constitute a part of the specification. Together with the embodiments disclosed in the present application, they are used to explain the technical solution disclosed in the present application and do not constitute a limitation on the technical solution disclosed in the present application.

[0029] Figure 1 This is a cross-sectional view of a heat dissipation device of a J-shaped pipe section of a submarine cable according to an embodiment of the first aspect of the present application;

[0030] Figure 2 This is a cross-sectional view of a collector in a heat dissipation device for a J-shaped pipe section of a submarine cable according to an embodiment of the first aspect of the present application.

[0031] Reference numerals: 100 - cable, 200 - J-tube, 210 - air section, 220 - seawater section, 300 - gravity heat pipe, 400 - radiator, 410 - air collecting pipe, 420 - liquid collecting pipe, 430 - flow channel, 440 - fin. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0036] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] Submarine cables serve as a bridge between offshore wind farms and onshore power grids, and play a role in transmitting and collecting electricity from offshore wind farms. Submarine cables are composed of landing sections, tidal flat sections, seabed sections, and J-shaped pipe sections. The J-shaped pipe section is sheathed on the outside of the cable to protect the cable. The J-shaped pipe section is divided into a platform section, an air section, and a seawater section. The platform section is connected to the offshore platform, the air section is set above the sea surface, and the seawater section is set below the sea surface.

[0038] Unlike the platform section and seawater section where the cables are directly exposed to the wind and seawater, in the air section of the J-shaped tube section, the cables are in a sealed environment with neither air convection nor seawater cooling, resulting in low heat transfer efficiency and poor heat dissipation conditions in the air section, and heat cannot be dissipated in time. Over time, the cable insulation ages faster and its service life is shortened. This phenomenon becomes more serious with the increase of current carrying capacity, making it a bottleneck that limits the safe and stable operation and power transmission capacity of the entire submarine cable.

[0039] Therefore, finding a heat dissipation method for the J-shaped pipe section of the submarine cable is of great significance for the offshore wind power transmission system.

[0040] In this regard, the present application proposes a heat dissipation device for a J-shaped tube section of a submarine cable, which performs local heat exchange on the cable 100 located in the air section 210 of the J-shaped tube 200 through a gravity heat pipe 300, thereby alleviating the impact of the high temperature here on the cable 100; and utilizes the characteristics of the heat exchange medium that evaporates and moves upward when heated, and condenses and moves downward when cooled to perform heat exchange and cooling of the vertically arranged cable 100.

[0041] In addition, the present application also proposes a working method of the heat dissipation device for the J-type pipe section of the above-mentioned submarine cable, using the radiator 400 to cool the heat exchange medium in the gravity heat pipe 300 again, so that the radiator 400 and the gravity heat pipe 300 together constitute a heat exchange cycle, continuously cooling and dissipating the cable 100 located in the air section 210 of the J-type pipe 200.

[0042] Reference Figure 1 The heat dissipation device of the J-type tube section of the submarine cable in the embodiment of the first aspect of the present application comprises a cable 100, a J-type tube 200, a gravity heat pipe 300 and a radiator 400. The cable 100 is arranged vertically, and the J-type tube 200 is sleeved on the outside of the cable 100 to protect the cable 100. The gravity heat pipe 300 is arranged in the J-type tube 200 and attached to the surface of the cable 100, and performs heat exchange on the cable 100 to cool it. The radiator 400 is connected to the gravity heat pipe 300, and is used to cool down and condense the heat exchange medium in the gravity heat pipe 300 to complete the circulation cooling of the cable 100.

[0043] Specifically, the J-tube 200 includes an air section 210 and a seawater section 220, wherein the air section 210 is above the sea surface and the seawater section 220 is below the sea surface. The gravity heat pipe 300 is disposed in the air section 210 and is attached to the outer surface of the cable 100, and the gravity heat pipe 300 can conduct heat with the cable 100. The gravity heat pipe 300 is loaded with a heat exchange medium, which can evaporate and move upward when heated, and can condense and move downward when cooled.

[0044] The radiator 400 is connected to the top of the gravity heat pipe 300 to transfer cold energy to the heat exchange medium.

[0045] The working principle of the heat dissipation device of the J-shaped pipe section of the submarine cable is as follows: the cable 100 generates heat during operation, and the heat is transferred to the gravity heat pipe 300 and absorbed by the heat exchange medium. At the same time, the heat exchange medium is heated and evaporated into gas and moves upward until it moves to the radiator 400 at the top. The radiator 400 cools and condenses the gaseous heat exchange medium, and the condensed liquid heat exchange medium moves downward and falls back into the gravity heat pipe 300, and conducts heat to the cable 100 again and absorbs heat.

[0046] Furthermore, the gravity heat pipe 300 is arranged along the axial direction of the cable 100, so as to increase the contact area between the gravity heat pipe 300 and the cable 100 as much as possible, thereby improving the heat conduction efficiency.

[0047] Furthermore, there are at least two gravity heat pipes 300, each of which is attached to the outer surface of the cable 100, and the top of each gravity heat pipe 300 is connected to the radiator 400. By increasing the number of gravity heat pipes 300, the heat exchange efficiency of the cable 100 can be improved, so that the cable 100 can be cooled faster.

[0048] Specifically, the gravity heat pipes 300 are distributed in a circular array around the cable 100 , so that the cable 100 is cooled evenly as a whole, thereby avoiding the situation where the cable 100 is damaged due to excessive differences in the extent of temperature reduction in different areas.

[0049] Furthermore, the bottom of the gravity heat pipe 300 is higher than the sea surface, thereby preventing the gravity heat pipe 300 from being corroded due to contact with seawater, thereby extending the service life of the gravity heat pipe 300.

[0050] Specifically, for the heat dissipation method of the radiator 400, air cooling, water cooling or other cooling methods can be used to cool and condense the heat exchange medium, which is used to re-condense the heat exchange medium into liquid and input it into the gravity heat pipe 300, forming a circulating flow of the heat exchange medium.

[0051] In this embodiment, the radiator 400 uses air cooling to condense the heat exchange medium. Figure 2 , the radiator 400 includes an air collecting pipe 410, a liquid collecting pipe 420 and a flow channel 430. The air collecting pipe 410 is arranged above the liquid collecting pipe 420, and there are multiple flow channels 430. Both ends of the flow channels 430 are respectively connected to the air collecting pipe 410 and the liquid collecting pipe 420. Among them, the air collecting pipe 410 is connected to the air outlet end of the gravity heat pipe 300, and the liquid collecting pipe 420 is connected to the liquid inlet end of the gravity heat pipe 300. During operation, the gaseous heat exchange medium evaporated by heat in the gravity heat pipe 300 enters the air collecting pipe 410 from the air outlet end. As the heat exchange medium moves in the radiator 400, its heat is gradually absorbed by the radiator 400 and condensed. Under the influence of gravity, the liquid heat exchange medium slides to the liquid collecting pipe 420 through the flow channel 430. Finally, the liquid heat exchange medium flows to the liquid inlet end of the gravity heat pipe 300 through the liquid collecting pipe 420 , and re-enters the gravity heat pipe 300 to continue cooling the cable 100 .

[0052] Furthermore, the heat sink 400 further includes fins 440, and the number of fins 440 is multiple and installed on the outside of each flow channel 430. Each fin 440 is parallel to each other and equidistantly arranged, and on the one hand, is used to guide air to flow through the gaps between each flow channel 430, and take away the heat on the flow channel 430 during the air flow; on the other hand, the fin 440 is also used to increase the contact area between the flow channel 430 and the air, and the heat on the flow channel 430 is transferred to the flowing air through the fin 440, and the heat is dissipated, thereby improving the heat dissipation efficiency of the heat sink 400.

[0053] Specifically, in the present application, the heat exchange medium in the gravity heat pipe 300 is R134a, which has a boiling point of -26.1°C at a standard atmospheric pressure and a suitable pressure, and is suitable as a working medium for the gravity heat pipe 300. The pipe material of the gravity heat pipe 300 is a copper pipe, which has better thermal conductivity. It is easy to understand that the pipe material of the gravity heat pipe 300 can also be a brass pipe or other pipe materials with thermal conductivity, which will not be repeated here.

[0054] A heat dissipation method based on the heat dissipation device of the J-shaped pipe section of the submarine cable in the second embodiment of the present application comprises the following steps:

[0055] S100. Install the gravity heat pipe 300 on the surface of the cable 100, and pay attention to setting the gravity heat pipe 300 in the air section of the J-tube 200 to prevent the bottom end of the gravity heat pipe 300 from contacting the seawater;

[0056] S200. The cable 100 starts to heat up during operation, and the heat exchange medium in the gravity heat pipe 300 evaporates due to the heat, while taking away the heat emitted by the cable 100, and the gaseous heat exchange medium moves upward;

[0057] S300. The gaseous heat exchange medium enters the radiator 400 and condenses. The condensed heat exchange medium returns to the gravity heat pipe 300 in liquid form;

[0058] S400. The liquid heat exchange medium slides to the bottom of the gravity heat pipe 300 due to gravity, and circulates to perform heat exchange on the cable 100.

[0059] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A heat dissipation device for a J-shaped pipe section of a submarine cable, characterized in that: include: cable; A J-shaped tube, which is sleeved on the outside of the cable, the J-shaped tube includes an air section and a seawater section, the air section is higher than the sea surface, and the seawater section is lower than the sea surface; A gravity heat pipe is arranged in the air section and is attached to the outer surface of the cable. The gravity heat pipe can conduct heat with the cable. A heat exchange medium is loaded in the gravity heat pipe. The heat exchange medium can evaporate and move upward when heated, and can condense and move downward when cooled. A radiator is connected to the top of the gravity heat pipe and is used to transfer cold energy to the heat exchange medium.

2. The heat dissipation device for the J-shaped pipe section of a submarine cable according to claim 1 is characterized in that: The gravity heat pipe is arranged along the axial direction of the cable.

3. The heat dissipation device for the J-shaped pipe section of a submarine cable according to claim 1 is characterized in that: There are at least two gravity heat pipes, each of which is attached to the outer surface of the cable, and the top of each of which is connected to the radiator.

4. The heat dissipation device for the J-shaped pipe section of a submarine cable according to claim 3 is characterized in that: The gravity heat pipes are distributed in a circular array around the cable.

5. The heat dissipation device for a J-shaped section of a submarine cable according to claim 1, characterized in that: The bottom of the gravity heat pipe is higher than the sea surface.

6. The heat dissipation device for a J-shaped pipe section of a submarine cable according to claim 1, characterized in that: The radiator includes an air collecting pipe, a liquid collecting pipe and a flow channel. The air collecting pipe is arranged above the liquid collecting pipe. There are multiple flow channels, and both ends of the flow channels are respectively connected to the air collecting pipe and the liquid collecting pipe; the air collecting pipe is connected to the air outlet end of the gravity heat pipe, and the liquid collecting pipe is connected to the liquid inlet end of the gravity heat pipe.

7. The heat dissipation device for the J-shaped pipe section of a submarine cable according to claim 6 is characterized in that: The heat sink further comprises fins, and the fins are in plurality and are installed on the outside of each of the flow channels.

8. The heat dissipation device for a J-shaped pipe section of a submarine cable according to claim 1, characterized in that: The heat exchange medium is R134a.

9. The heat dissipation device for a J-shaped pipe section of a submarine cable according to claim 1, characterized in that: The pipe material of the gravity heat pipe is a copper pipe.

10. A heat dissipation method based on the heat dissipation device of the J-shaped pipe section of a submarine cable according to any one of claims 1 to 9, characterized in that: include: Install the gravity heat pipe on the surface of the cable, and make sure that the gravity heat pipe is set in the air section of the J-shaped tube; The cable starts to generate heat during operation, and the heat exchange medium in the gravity heat pipe evaporates due to the heat, taking away the heat emitted by the cable, and the gaseous heat exchange medium moves upward; The gaseous heat exchange medium enters the radiator to condense, and the condensed heat exchange medium returns to the gravity heat pipe in liquid form; The liquid heat exchange medium slides to the bottom of the gravity heat pipe due to gravity, and circulates to exchange heat with the cable.

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