Submarine cable core degassing device

Abstract

The invention relates to the technical field of submarine cable degassing, and provides a submarine cable core degassing device which comprises a degassing chamber, a plurality of air chambers and a plurality of return air heating assemblies. The degassing chamber comprises an inner cylinder, an outer cylinder, a cylinder top and a cylinder bottom, the inner cylinder, the outer cylinder, the cylinder top and the cylinder bottom define a degassing space, and the degassing space is used for placing a submarine cable core. An air inlet hole is formed in the cylinder bottom. And air return holes are formed in the inner cylinder and / or the cylinder top. The multiple air chambers are arranged at the bottom of the degassing chamber and distributed in the circumferential direction of the cylinder bottom. And each air chamber is communicated with the degassing space through the corresponding air inlet hole. The air inlet of each return air heating assembly is communicated with the corresponding return air hole, and the air outlet of each return air heating assembly is communicated with the corresponding air chamber. According to the submarine cable core degassing device, the degassing chamber, the return air heating assembly and the air chamber are sequentially communicated end to end to form the circulating air duct, so that air performs heat convection with the submarine cable core in the degassing space, and each part of the cable core is heated more uniformly.

Description

Technical Field

[0001] The invention relates to the technical field of submarine cable degassing, and in particular to a submarine cable core degassing device. Background Art

[0002] During the production process of high-voltage submarine cables, cross-linked byproducts are produced. These byproducts remain inside the insulation layer, causing local accumulation of space charge in the insulation layer, which can easily lead to breakdown of the insulation during the withstand voltage test. The main components of the byproducts are gaseous and solid byproducts such as methane, cumyl alcohol, acetophenone, and α-methylstyrene. In related technologies, heating and degassing can usually be used to cause byproducts to overflow from the cable core, especially the emission of methane gas. The length of the degassing time and the control of the temperature are closely related to improving the uniformity of the space charge in the insulating material. The cross-linked core after degassing can effectively improve the distribution of space charge in the XLPE (Crosslinked Polyethylene) composite medium. The content of byproduct methane gas will also be reduced. The degassing process can not only improve the electrical performance of the cross-linked core, but also eliminate the internal stress of the material. Its importance is self-evident.

[0003] In the related technology, electric heating is generally used to degas the cross-linked battery cells during the production process, that is, the conductor is heated by applying a certain voltage externally using the conductor's own resistance, and the insulating material is heated by the principle of heat conduction. However, the heat conduction effect is not good, and the uniformity of heating the cable core at different positions cannot be guaranteed. The degassing time is long, which affects the production efficiency. Summary of the invention

[0004] The present invention provides a submarine cable core degassing device to solve the defects in the prior art that the heat conduction effect is poor when degassing the submarine cable, the uniformity of heating the cable core at different positions cannot be guaranteed, the degassing time is long, and the production efficiency is affected.

[0005] The present invention provides a submarine cable core degassing device, comprising: The degassing chamber comprises an inner cylinder, an outer cylinder, a cylinder top and a cylinder bottom, wherein the inner cylinder, the outer cylinder, the cylinder top and the cylinder bottom together form a degassing space, and the degassing space is used to place the cable core of the submarine cable; the cylinder bottom is provided with an air inlet hole; the inner cylinder and / or the cylinder top is provided with an air return hole; A plurality of air chambers, the plurality of air chambers are arranged at the bottom of the degassing chamber, and the plurality of air chambers are arranged along the circumferential direction of the bottom of the cylinder; each of the air chambers is connected to the degassing space through the corresponding air inlet hole; There are multiple return air heating components, the air inlet of each return air heating component is connected to the corresponding return air hole, the air outlet of the return air heating component is connected to the corresponding air chamber, and the return air heating component is used to heat the return air in the degassing space and then send it into the corresponding air chamber.

[0006] According to the submarine cable core degassing device of the present invention, each of the return air heating components includes a return air duct, a fan, a heater and an air supply duct, the air inlet of the fan is connected to the corresponding return air hole through the return air duct, the air outlet of the fan is connected to the air inlet of the heater, and the air inlet of the heater is connected to the corresponding air chamber through the air supply duct.

[0007] According to the submarine cable core degassing device of the present invention, each of the return air heating components comprises a plurality of the air supply ducts and proportional valves corresponding to the air supply ducts one by one, the plurality of the air supply ducts are respectively connected to the corresponding air chambers, and each of the proportional valves is arranged in the corresponding air supply duct to control the opening of the air supply duct.

[0008] According to the submarine cable core degassing device of the present invention, it also includes a temperature control component, which includes a plurality of temperature sensors and a controller. The plurality of temperature sensors are arranged in the degassing space, and the plurality of temperature sensors are arranged at intervals along the circumference of the degassing space; the controller is respectively communicated with each of the temperature sensors, each of the fans, each of the heaters and each of the proportional valves.

[0009] According to the submarine cable core degassing device of the present invention, there are multiple groups of temperature sensors, and each group of temperature sensors is arranged in one-to-one correspondence with the wind chamber; Each group of the temperature sensors is located in the degassing space directly above the corresponding wind chamber, and each group of the temperature sensors includes a plurality of the temperature sensors arranged at intervals along the vertical direction.

[0010] According to the submarine cable core degassing device of the present invention, there are multiple groups of air inlet holes, and the multiple groups of air inlet holes are arranged at intervals along the circumference of the bottom of the cylinder, and each group of air inlet holes includes multiple air inlet holes arranged at intervals along the radial direction of the bottom of the cylinder.

[0011] According to the submarine cable core degassing device of the present invention, the inner wall of the degassing chamber is covered with a thermal insulation layer.

[0012] According to the submarine cable core degassing device of the present invention, the top of the cylinder is provided with an exhaust hole connected to the outside, and an exhaust fan is provided outside the exhaust hole.

[0013] The submarine cable core degassing device according to the present invention further includes a plurality of methane gas detection sensors, which are all arranged in the degassing space and spaced apart in the vertical direction, and are used to detect the methane gas concentration.

[0014] According to the submarine cable core degassing device of the present invention, the wind chamber is fan-shaped, and a plurality of the wind chambers are sequentially spliced ​​along the circumference of the cylinder bottom to cover the cylinder bottom.

[0015] The degassing device for the submarine cable core of the present invention forms a degassing space in the degassing chamber by setting the degassing chamber to a structure formed by an inner tube, an outer tube, a tube top and a tube bottom. The degassing space is used to store the submarine cable core for heating, so that the entire degassing chamber can be adapted to the structure of the ground turntable for collecting the submarine cable. The structure can be directly modified on the ground turntable with the collected submarine cable, which is convenient for installation, and can reduce the heating space and improve the heating efficiency. At the same time, the degassing chamber, the return air heating assembly and the wind chamber are connected end to end in sequence to form a circulating air duct, so that the air circulates after being driven and heated by the return air heating assembly, and convects heat with the submarine cable core in the degassing space, so that the heating efficiency is higher and the heating of various parts of the cable core is more uniform. In addition, multiple return air heating components and multiple independent wind chambers are connected correspondingly, and multiple independent wind chambers are arranged circumferentially at the bottom of the bottom of the cylinder so as to supply air to each area in the degassing space separately. By independently controlling each return air heating component, the air supply of one or more wind chambers can be independently controlled, thereby controlling the air supply volume and air supply temperature of each area of ​​the degassing space, which is conducive to achieving uniform heating of the cable core in each area, and effectively solves the defects of the prior art that the heat conduction effect is poor when degassing the submarine cable, the uniformity of the heating of the cable core at different positions cannot be guaranteed, the degassing time is long, and the production efficiency is affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of a submarine cable core degassing device provided in an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Cross-sectional view at position B in the middle.

[0019] Reference numerals: 1. Submarine cable core degassing device; 11. degassing chamber; 111. inner cylinder; 112. outer cylinder; 113. cylinder top; 114. cylinder bottom; 115. degassing space; 12. Wind chamber; 13. Return air heating assembly; 131. Return air duct; 132. Fan; 133. Heater; 134. Supply air duct. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Combine the following Figure 1-Figure 2 The invention relates to a submarine cable core degassing device.

[0022] like Figure 1 and Figure 2 As shown, the present invention provides a submarine cable core degassing device 1, comprising: a degassing chamber 11, a plurality of wind chambers 12 and a plurality of return air heating assemblies 13. The degassing chamber 11 comprises an inner tube 111, an outer tube 112, a tube top 113 and a tube bottom 114, and the inner tube 111, the outer tube 112, the tube top 113 and the tube bottom 114 together form a degassing space 115, and the degassing space 115 is used to place the submarine cable core. The tube bottom 114 is provided with an air inlet hole. The inner tube 111 and / or the tube top 113 are provided with a return air hole. A plurality of wind chambers 12 are arranged at the bottom of the degassing chamber 11, and the plurality of wind chambers 12 are arranged along the circumference of the tube bottom 114. Each wind chamber 12 is connected to the degassing space 115 through a corresponding air inlet hole. The air inlet of each return air heating assembly 13 is connected to the corresponding return air hole, and the air outlet of the return air heating assembly 13 is connected to the corresponding air chamber 12. The return air heating assembly 13 is used to heat the return air in the degassing space 115 and then send it into the corresponding air chamber 12.

[0023] In this embodiment, the degassing chamber 11 is composed of an inner tube 111, an outer tube 112, a tube top 113 and a tube bottom 114, wherein the outer tube 112 is sleeved outside the inner tube 111, the tube top 113 and the tube bottom 114 are located between the inner tube 111 and the outer tube 112, the tube top 113 connects the top ends of the inner tube 111 and the outer tube 112, and the tube bottom 114 connects the bottom ends of the inner tube 111 and the outer tube 112, thereby forming a degassing space 115 in the degassing chamber 11. The degassing space 115 can be used to store the submarine cable core to be heated and degassed. In addition, the structure of the degassing chamber 11 is also adapted to a ground turntable for gathering the submarine cable. Specifically, after the ground turntable rotates to gather the submarine cable, the fan-shaped plate of the ground turntable used to carry the submarine cable core is used as the bottom 114 of the cylinder, and other structures are built on the bottom 114 to make the degassing space 115 of the degassing chamber 11 closer to the submarine cable core and make the entire heating space smaller, thereby improving the heating efficiency.

[0024] At the same time, by setting an air inlet hole on the bottom 114 of the degassing chamber 11, and setting a return air hole on the inner tube 111 or the top 113, the return air hole, the return air heating assembly 13, the air chamber 12 and the air inlet hole are connected in sequence to form a circulating air duct, so that the air is circulated and heated in the circulating air duct, and the cable core in the degassing space 115 is heated and degassed by thermal convection. Specifically, the air in the degassing space 115 is sucked by the return air heating assembly 13 and passes through the return air heating assembly 13, and is then sent into the air chamber 12 after being heated by the return air heating assembly 13, and enters the degassing space 115 from the air inlet hole on the bottom 114 through the air chamber 12, and rises in the degassing space 115. During the rising process, the hot air convects and exchanges heat with the cable core in the degassing space 115, so that the heating efficiency is higher and the heating is more uniform. The hot air can quickly rise to the position of the return air hole and then pass through the return air heating assembly 13 again to realize the circulating heating of the air. In addition, it is understood that by setting the air inlet holes at the bottom 114 of the cylinder and the return air holes at higher positions such as the inner cylinder 111 or the cylinder top 113, the hot air can naturally rise after entering the degassing space 115 until it reaches the position of the return air holes and is sucked by the return air heating assembly 13. It is understood that the return air holes can be set on the inner cylinder 111 or the cylinder top 113, or some of the return air holes can be set on the inner cylinder 111 and the other part of the return air holes can be set on the cylinder top 113.

[0025] In addition, the present embodiment also arranges a plurality of independent air chambers 12 at the bottom of the degassing chamber 11, so that the plurality of air chambers 12 are arranged along the circumference of the bottom 114 of the cylinder, so that hot air is supplied to different areas in the degassing space 115 through different air chambers 12, and each air chamber 12 is supplied with air by a corresponding return air heating assembly 13, so that when necessary, the air supply volume and air supply temperature of each air chamber 12 can be adjusted by adjusting the return air heating assembly 13, so as to independently adjust the hot air temperature and hot air volume of different areas in the degassing space 115, which is conducive to making the cable cores in various areas of the degassing space 115 heated more evenly and achieving better degassing effect. It can be understood that the return air heating assembly 13 can be arranged in a one-to-one correspondence with the air chamber 12, or one return air heating assembly 13 can be connected to multiple air chambers 12 at the same time to supply air to multiple air chambers 12.

[0026] The degassing device 1 for the core of a submarine cable of the present invention is configured such that the degassing chamber 11 is formed by an inner tube 111, an outer tube 112, a tube top 113 and a tube bottom 114, so as to form a degassing space 115 in the degassing chamber 11. The degassing space 115 is used to store the core of the submarine cable for heating, so that the entire degassing chamber 11 can be adapted to the structure of the ground turntable for collecting the submarine cable, and the structure can be directly modified on the ground turntable with the collected submarine cable, which is convenient for installation, and can reduce the heating space and improve the heating efficiency. At the same time, the degassing chamber 11, the return air heating assembly 13 and the wind chamber 12 are connected end to end in sequence to form a circulating air duct, so that the air circulates after being driven and heated by the return air heating assembly 13, and convects heat with the core of the submarine cable in the degassing space 115, so that the heating efficiency is higher and the heating of each part of the cable core is more uniform. In addition, multiple return air heating components 13 and multiple independent wind chambers 12 are correspondingly connected, and multiple independent wind chambers 12 are arranged circumferentially at the bottom of the barrel bottom 114 so as to supply air to each area in the degassing space 115 respectively. By independently controlling each return air heating component 13, it is possible to independently control the air supply of one or more wind chambers 12, thereby controlling the air supply volume and air supply temperature of each area of ​​the degassing space 115, which is conducive to achieving uniform heating of the cable core in each area, and effectively solves the defects of the prior art that the heat conduction effect is poor when degassing the submarine cable, the uniformity of the heating of the cable core at different positions cannot be guaranteed, the degassing time is long, and the production efficiency is affected.

[0027] Specifically, when installing the cylinder top 113, the corresponding lifting tooling can be used to lift the cylinder top 113, which is safer and more convenient.

[0028] Specifically, Figure 1 and Figure 2As shown, each return air heating assembly 13 includes a return air duct 131, a fan 132, a heater 133 and an air supply duct 134. The air inlet of the fan 132 is connected to the corresponding return air hole through the return air duct 131, the air outlet of the fan 132 is connected to the air inlet of the heater 133, and the air inlet of the heater 133 is connected to the corresponding air chamber 12 through the air supply duct 134.

[0029] In this embodiment, by connecting the fan 132, the return air duct 131 and the return air hole of the degassing chamber 11, the fan 132 is used to form a negative pressure environment in the return air duct 131, so as to draw the air in the degassing space 115 into the return air duct 131 and transport it to the heater 133. After the heater 133 heats the air, the air is transported to the wind chamber 12, and the wind chamber 12 supplies air to the degassing chamber 11.

[0030] Optionally, in some embodiments, Figure 1 and Figure 2 As shown, each return air heating assembly 13 includes a plurality of air supply ducts 134 and proportional valves (not shown in the figure) corresponding to the air supply ducts 134 , and the plurality of air supply ducts 134 are respectively connected to the corresponding air chambers 12 , and each proportional valve is arranged in the corresponding air supply duct 134 to control the opening of the air supply duct 134 .

[0031] In this embodiment, by connecting the heater 133 of each return air heating assembly 13 to a plurality of air supply ducts 134, the plurality of air supply ducts 134 can be respectively connected to the corresponding air chambers 12, so that air can be supplied to the plurality of air chambers 12 through a single fan 132 and a heater 133. It can be understood that the air supply ducts 134 can be connected to the air chambers 12 one by one, or a plurality of air supply ducts 134 can be connected to one air chamber 12. At the same time, a proportional valve is installed in each air supply duct 134 to independently control the opening of each air supply duct 134, thereby controlling the air supply volume of each air chamber 12 by the return air heating assembly 13, and further realizing independent control of the air supply volume between different areas of the degassing space 115, so as to adjust the air supply volume of each area when necessary, and realize uniform heating of the cable core in each area.

[0032] Further, in some embodiments, the submarine cable core degassing device 1 further includes a temperature control assembly (not shown in the figure), the temperature control assembly includes a plurality of temperature sensors and a controller, the plurality of temperature sensors are arranged in the degassing space 115, and the plurality of temperature sensors are arranged at intervals along the circumference of the degassing space 115. The controller is respectively connected to each temperature sensor, each fan 132, each heater 133, and each proportional valve in communication.

[0033] In this embodiment, a plurality of temperature sensors are arranged at intervals along the circumference of the degassing space 115 so as to monitor the temperature at various circumferential positions in the degassing space 115, and the corresponding temperature data is transmitted to the controller. The controller is used to adjust the rotation speed of the fan 132 supplying air to the area, the power of the heater 133 and the proportional valve of the corresponding air supply duct 134 according to the temperature data of various positions in the degassing space 115, so as to adjust the air supply volume and air supply temperature of the corresponding area, and minimize the temperature difference of various positions in the degassing space 115, so as to evenly heat the cable core in each area.

[0034] Specifically, in some embodiments, there are multiple groups of temperature sensors, each group of temperature sensors is arranged one-to-one with the wind chamber 12. Each group of temperature sensors is located in the degassing space 115 directly above the corresponding wind chamber 12, and each group of temperature sensors includes multiple temperature sensors arranged at intervals in the vertical direction.

[0035] In this embodiment, a group of temperature sensors are arranged in the degassing space 115 directly above each wind chamber 12. The group of temperature sensors includes a plurality of temperature sensors arranged at intervals in the vertical direction, so that the temperatures of the areas in the degassing space 115 directly above each wind chamber 12 at different heights can be detected respectively, so that the controller can adjust the operating parameters of the fan 132, the heater 133 and the proportional valve on the air supply duct 134 corresponding to the wind chamber 12.

[0036] It is understandable that in order to fully utilize the degassing space 115, the submarine cable cores can be stacked in the degassing space 115, and each group of multiple temperature sensors can be correspondingly arranged at the upper, middle and lower parts of the stacked submarine cable cores.

[0037] Optionally, in some embodiments, there are multiple groups of air inlet holes, and the multiple groups of air inlet holes are arranged at intervals along the circumference of the cylinder bottom 114, and each group of air inlet holes includes a plurality of air inlet holes arranged at intervals along the radial direction of the cylinder bottom 114.

[0038] In this embodiment, the air inlet holes are divided into multiple groups, and the multiple groups of air inlet holes are arranged circumferentially along the bottom 114 of the cylinder. The multiple air inlet holes in each group are arranged radially at intervals along the bottom 114 of the cylinder, so that the air inlet holes can cover the bottom 114 of the cylinder as evenly as possible, so as to supply air more evenly to the entire degassing space 115.

[0039] In some embodiments, the inner wall of the degassing chamber 11 is covered with an insulation layer. In this embodiment, by covering the inner wall of the degassing chamber 11 with an insulation layer, the heat exchange between the gas in the degassing space 115 and the inner wall of the degassing chamber 11 is reduced, the heat lost from the inner wall of the degassing chamber 11 is reduced, and the heating efficiency is improved. It is understandable that the surfaces of the inner cylinder 111, the outer cylinder 112, the cylinder top 113 and the cylinder bottom 114 can be covered with insulation layers of different materials as needed. For example, 100mm insulation cotton is pasted on the surface of the inner cylinder 111 and the outer cylinder 112, and the surface of the cylinder bottom 114 is covered with an EVA board (ethylene-vinyl acetate copolymer). Furthermore, the outer cylinder 112 can be composed of a plurality of rock wool insulation boards, and the plug-in between the insulation boards is sealed by a sealing strip that is resistant to high temperature and has good insulation performance, so as to achieve a heat insulation effect and prevent heat from being absorbed and lost by the chamber body of the degassing chamber 11.

[0040] Specifically, in some embodiments, the cylinder top 113 is provided with an exhaust hole connected to the outside, and an exhaust fan is provided outside the exhaust hole.

[0041] In this embodiment, an exhaust hole is provided at the top of the cylinder 113, and an exhaust fan is provided outside the exhaust hole so that part of the gas in the degassing chamber 11 can be discharged from the exhaust hole, so that the methane and other impurity gases overflowing from the core of the submarine cable can be discharged as much as possible, and the concentration of methane or other gases in the degassing chamber 11 can be reduced to avoid excessive concentration of methane and other gases, which may cause danger, and it is also convenient to continuously heat and degas the cable core.

[0042] Specifically, in some embodiments, the submarine cable core degassing device 1 also includes a plurality of methane gas detection sensors, which are all arranged in the degassing space 115 and arranged at intervals in the vertical direction, and the methane gas detection sensors are used to detect the methane gas concentration.

[0043] In this embodiment, multiple methane gas detection sensors are arranged at intervals in the vertical direction in the degassing space 115 so as to detect the methane gas concentration at different heights in the degassing space 115. It can be understood that the methane gas concentration detection sensor can be connected to the control system of the entire submarine cable core degassing device 1, so that the control system can judge the degassing effect according to the methane concentration in the degassing space 115, and at the same time, when the methane concentration in the degassing space 115 is too high, the exhaust fan can be controlled to discharge methane.

[0044] It is understandable that in order to fully utilize the degassing space 115, the submarine cable cores can be stacked in the degassing space 115, and the methane gas concentration detection sensors can be correspondingly arranged at the upper, middle and lower parts of the stacked submarine cable cores.

[0045] Specifically, in some embodiments, the air chamber 12 is in a fan-shaped ring shape, and multiple air chambers 12 are sequentially spliced ​​along the circumference of the cylinder bottom 114 to cover the cylinder bottom 114. In this embodiment, by setting the air chamber 12 in a fan-shaped ring shape, so that the top of the air chamber 12 can be adapted to the cylinder bottom 114, multiple air chambers 12 are sequentially spliced ​​to form a circular ring with the same top area and the bottom side area of ​​the cylinder bottom 114 to cover the entire cylinder bottom 114, and air is uniformly supplied to the entire cylinder bottom 114 through each air chamber 12. Multiple air inlet holes in the cylinder bottom 114 are used to uniformly supply air to the degassing space 115.

[0046] In a specific embodiment, the air chamber 12 is in the shape of a fan ring, and the arc of each fan ring is 30°. There are twelve air chambers 12 in total, and the twelve air chambers 12 are spliced ​​to form a circular ring, which is arranged at the bottom of the cylinder bottom 114. The inner side of the inner cylinder 111 is in the shape of a hollow cylinder, and the return air heating assembly 13 is arranged on the inner side of the inner cylinder 111 to reduce the occupied space of the entire submarine cable core degassing device 1. Specifically, there are four return air heating assemblies 13, and each return air heating assembly 13 is evenly arranged along the circumference of the degassing chamber 11. The heater 133 of each return air heating assembly 13 is connected to three air supply ducts 134, and the three air supply ducts 134 are respectively connected to the three air chambers 12 one by one, so as to supply air to the three air chambers 12. A proportional valve is arranged in each air supply duct 134 to control the opening.

[0047] In some embodiments, a maintenance ladder is provided outside the degassing chamber 11, through which operators enter the degassing chamber 11 to arrange the cable core of the submarine cable. It can also serve as an auxiliary facility for equipment maintenance personnel to repair the degassing device.

[0048] In addition, in this application, a large amount of experimental data was obtained by infrared spectroscopy and gas chromatography to verify the degassing effect of the submarine cable core degassing device 1 on the cross-linked core byproducts (i.e., impurity gases such as methane), and a mathematical calculation model for degassing the AC and DC submarine cable insulation core was constructed. Through this mathematical calculation model, the optimal theoretical degassing time and degassing temperature can be determined according to the thickness of the insulation layer of the submarine cable core.

[0049] Specifically, the present application establishes the gas diffusion equation of the byproducts through Fick's law.

[0050] Where C is the concentration, D is the diffusion coefficient of the gas, 2 is the Laplace operator, t is the diffusion time, and the diffusion coefficient D is calculated as follows: D = D0 × exp (-Ea / (RT)) Where D0 is the prefactor, Ea is the activation energy, R is the gas constant, and T is the absolute temperature.

[0051] Combined with the above formula, by determining the geometric dimensions of the submarine cable core (including the cable core size, the thickness of the insulation layer, etc.) and the residual gas concentration threshold finally obtained by degassing, the optimal heating temperature and the required heating time in the degassing process can be determined, so as to control the return air heating assembly 13 and achieve a better degassing effect.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A submarine cable core degassing device, characterized in that: include: The degassing chamber comprises an inner cylinder, an outer cylinder, a cylinder top and a cylinder bottom, wherein the inner cylinder, the outer cylinder, the cylinder top and the cylinder bottom together form a degassing space, and the degassing space is used to place the cable core of the submarine cable; the cylinder bottom is provided with an air inlet hole; the inner cylinder and / or the cylinder top is provided with an air return hole; A plurality of air chambers, the plurality of air chambers are arranged at the bottom of the degassing chamber, and the plurality of air chambers are arranged along the circumferential direction of the bottom of the cylinder; each of the air chambers is connected to the degassing space through the corresponding air inlet hole; There are multiple return air heating components, the air inlet of each return air heating component is connected to the corresponding return air hole, the air outlet of the return air heating component is connected to the corresponding air chamber, and the return air heating component is used to heat the return air in the degassing space and then send it into the corresponding air chamber.

2. The submarine cable core degassing device according to claim 1, characterized in that: Each of the return air heating components includes a return air duct, a fan, a heater and an air supply duct. The air inlet of the fan is connected to the corresponding return air hole through the return air duct, the air outlet of the fan is connected to the air inlet of the heater, and the air inlet of the heater is connected to the corresponding air chamber through the air supply duct.

3. The submarine cable core degassing device according to claim 2, characterized in that: Each of the return air heating components includes a plurality of the air supply ducts and proportional valves corresponding to the air supply ducts one by one. The plurality of air supply ducts are respectively connected to the corresponding air chambers. Each of the proportional valves is arranged in the corresponding air supply duct to control the opening of the air supply duct.

4. The submarine cable core degassing device according to claim 3, characterized in that: It also includes a temperature control component, which includes multiple temperature sensors and a controller. The multiple temperature sensors are arranged in the degassing space, and the multiple temperature sensors are arranged at intervals along the circumference of the degassing space; the controller is respectively communicated with each of the temperature sensors, each of the fans, each of the heaters and each of the proportional valves.

5. The submarine cable core degassing device according to claim 4, characterized in that: There are multiple groups of temperature sensors, and each group of temperature sensors is arranged in one-to-one correspondence with the wind chamber; Each group of the temperature sensors is located in the degassing space directly above the corresponding wind chamber, and each group of the temperature sensors includes a plurality of the temperature sensors arranged at intervals along the vertical direction.

6. The submarine cable core degassing device according to claim 1, characterized in that: There are multiple groups of air inlet holes, and the multiple groups of air inlet holes are arranged at intervals along the circumference of the bottom of the cylinder. Each group of air inlet holes includes multiple air inlet holes arranged at intervals along the radial direction of the bottom of the cylinder.

7. The submarine cable core degassing device according to claim 1, characterized in that: The inner wall of the degassing chamber is covered with a thermal insulation layer.

8. The submarine cable core degassing device according to claim 1, characterized in that: The top of the cylinder is provided with an exhaust hole connected to the outside, and an exhaust fan is provided outside the exhaust hole.

9. The submarine cable core degassing device according to claim 8, characterized in that: It also includes a plurality of methane gas detection sensors, which are all arranged in the degassing space and spaced apart in the vertical direction, and are used to detect the concentration of methane gas.

10. The submarine cable core degassing device according to claim 1, characterized in that: The air chamber is fan-shaped, and a plurality of the air chambers are sequentially spliced ​​along the circumference of the cylinder bottom to cover the cylinder bottom.

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