ES3018111T3 - Dynamic and static submarine cable and manufacturing method therefor - Google Patents

Abstract

The present invention relates to the technical field of submarine cables and provides a dynamic and static submarine cable, as well as its manufacturing method, to solve the technical problem of its long production period. The dynamic and static submarine cable comprises: a continuous core comprising a dynamic section, a static section, and a transition section connecting the two; a first shielding layer, coated on the outer sides of the dynamic section, the static section, and the transition section; a transition device, coated on the outer side of the first shielding layer corresponding to the transition section; and a second shielding layer, coated on the outside of the first shielding layer corresponding to the dynamic section. A first end of the second shielding layer covers part of the transition device and is welded to the peripheral surface thereof. The dynamic and static submarine cable provided by the present invention is used for electrical conduction and communication. (Automatic translation with Google Translate, no legal value)

Description

DESCRIPTION

Dynamic and static submarine cable and method for manufacturing the same

Technical field

The present invention relates to the field of submarine cable technologies and, in particular, to a dynamic and static submarine cable and a method for manufacturing the same.

Background

A dynamic and static submarine cable generally includes a connected dynamic cable and a static cable. The dynamic cable is laid in seawater and constantly moves under the influence of environmental factors such as wind, waves, and currents. The static cable is buried in the seabed and is less affected by environmental factors, so it does not constantly move. With the development and utilization of marine resources, offshore platforms such as offshore oil and gas platforms, offshore wind turbines, wave power generators, and tidal power generators are gradually increasing, and the demand for dynamic and static submarine cables is also gradually increasing.

Due to the different working conditions, the structures of dynamic and static cables differ. Taking the armor layer as an example, dynamic cables are generally subjected to more impact and wear than static cables, so the number of armor layers of dynamic cables is greater than that of static cables. In related technology, dynamic and static cables are generally produced separately, and then a service junction box is used to connect the dynamic and static cables to form a dynamic and static submarine cable.

However, there is a long production cycle for the dynamic and static submarine cables mentioned above.

Document CN111477393A describes a transition assembly for a dynamic submarine cable and a static submarine cable and a preparation method thereof. The transition assembly for a dynamic submarine cable and a static submarine cable is composed of a cable unit, an armored transition unit, and a sheath transition unit. The dynamic submarine cable and the static submarine cable are respectively composed of a cable unit, an armored steel wire, and a sheath. The dynamic submarine cable and the static submarine cable adopt the same cable unit. The cable units are continuous in the production and manufacturing process, and the online transition of the cable units is mainly reflected in the transition of the armored unit and the sheath unit.

Document CA3059844A1 describes a submarine power cable comprising: a feed core including a conductor, wherein the conductor has a conductive joint in a joint region (R) of the feed core, a main shielding layer comprising a plurality of main shielding wires arranged around the feed core and extending in the axial direction of the feed core, and a joint reinforcing shielding layer comprising a plurality of joint reinforcing shielding wires axially locked with respect to the main shielding wires, wherein the joint reinforcing shielding layer is provided only in the joint region and arranged in layers with the main shielding layer, the joint reinforcing shielding layer and the main shielding layer, thereby forming a double layer shielding only in the joint region (R).

Summary

In view of the above problem, the present invention provides a dynamic and static submarine cable according to claim 1 and a method for manufacturing the same, to shorten the production cycle of the dynamic and static submarine cable, according to claim 7.

The present invention is set forth in the appended set of claims.

In order to achieve the above purpose, embodiments of the present invention provide the following technical solutions.

The present invention provides a dynamic and static submarine cable, according to claim 1, which covers part of the transition device and is welded to an outer peripheral surface of the

The dynamic and static submarine cable provided by the present invention has the following advantages:

In the dynamic and static submarine cable provided by embodiments of the present invention, the first armor layer is wrapped outside the dynamic section, the static section, and the transition section of the cable core, and the transition device is wrapped outside the first armor layer corresponding to the transition section. The second armor layer is wrapped outside the first armor layer corresponding to the dynamic section, and the first end of the second armor layer is welded to the outer peripheral surface of the transition device. With such an arrangement, the transition between the armor layer of the dynamic section and the armor layer of the static section can be realized by connecting the transition device and the second armor layer, thereby ensuring the continuity of the production process of the dynamic and static submarine cable. It is not necessary to produce the dynamic cable and the static cable separately when producing the dynamic and static submarine cable, thereby shortening the production cycle.

The present invention provides a method for manufacturing a dynamic and static submarine cable according to claim 7.

The method for manufacturing the dynamic and static submarine cable provided by the present invention has the following advantages:

In the method for manufacturing the dynamic and static submarine cable provided by embodiments of the present invention, the cable core is produced continuously, and the cable core is divided into the dynamic section, the static section, and the transition section by setting demarcation points. The first armor layer is braided on the outer peripheral surface of the dynamic section, on the outer peripheral surface of the static section, and on the outer peripheral surface of the transition section. The heat transfer unit is formed on the outer peripheral surface of the first armor layer corresponding to the transition section, and the welding unit is wrapped on the outer peripheral surface of the heat transfer unit. The second armor layer is braided on the outer peripheral surface of the first armor layer corresponding to the dynamic section, and the first end of the second armor layer covers part of the welding unit and is welded to the outer peripheral surface of the welding unit. With such an arrangement, the transition between the dynamic section armor layer and the static section armor layer can be realized by the connection of the welding unit and the second armor layer, and the dynamic and static submarine cable can be produced continuously without the need to produce the dynamic cable and the static cable separately, thus shortening the production cycle.

Brief description of the drawing(s)

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the drawings necessary to describe the embodiments or the prior art will be briefly presented below. Obviously, the accompanying drawings described below show some embodiments of the present invention, and those skilled in the art can still derive other drawings from these accompanying drawings without creative effort.

Figure 1 is a cross-sectional diagram of a dynamic and static submarine cable provided by the present invention.

Figure 2 is a schematic structural diagram of a transition region of a dynamic and static submarine cable provided by the present invention.

Figure 3 is a schematic structural diagram of a dynamic and static submarine cable provided by the present invention.

Figure 4 is a schematic structural diagram of a cable core in an embodiment of the present invention. Figure 5 is a schematic structural diagram of an electrical unit in an embodiment of the present invention. Figure 6 is a schematic structural diagram of an optical unit in an embodiment of the present invention. Figure 7 is a schematic diagram of an outer layer structure of a dynamic section according to the present invention.

Figure 8 is a schematic diagram of an outer layer structure of a static section according to the present invention.

Figure 9 is a schematic structural diagram of a half-ring portion according to an embodiment of the present invention.

Figure 10 is a schematic diagram in axial cross-section of a half-ring portion according to the present invention.

Figure 11 is a schematic axial cross-sectional diagram of another half-ring portion in an embodiment of the present invention.

Description of reference numbers

10: cable core; 11: electric unit;

111: conductor; 112: inner semiconductor shielding layer;

113: insulating layer; 114: outer semiconducting shielding layer;

115: water-blocking semiconductor layer; 116: conductor shielding layer;

117: phase-splitting sheath layer; 12: optical unit;

121: optical fiber; 122: water-blocking filler;

123: outer casing; 124: inner semiconducting sheath;

125: Optical unit shielding layer; 126: Water-blocking tape;

127: outer semiconducting sheath; 13: filler;

14: first layer of sheath; 15: dynamic section;

16: static section; 17: transition section;

20: first layer of armor; 30: inner cushioning layer;

40: second layer of armor; 50: second layer of sheath;

60: third layer of sheath; 70: transition device;

71: welding unit; 711: half-ring part;

712: Weld fixation area; 713: Smooth transition area.

Description of the achievements

A dynamic and static submarine cable generally includes a connected dynamic cable and a static cable. Both the dynamic cable and the static cable include a cable core and an armor layer covering the cable core. Since the dynamic cable is laid in seawater and the static cable is buried in the seabed, the static cable suffers less impact and wear than the dynamic cable. Therefore, the number of armor layers of the static cable is generally fewer than that of the dynamic cable, resulting in different structures between the dynamic and static cables. In related art, the dynamic cable and the static cable are generally produced separately, and then a service junction box is used to connect the cable cores and armor layers of the dynamic cable and the static cable to realize the transition between the dynamic cable and the static cable, thus forming a dynamic and static submarine cable. However, the separate production of the dynamic cable and the static cable increases the production cycle, and the process of connecting the cable cores and the shielding layers is time-consuming, further increasing the production cycle. In addition, the connection of the dynamic cable core and the static cable core by the service junction box increases the transmission loss of the cable cores. In view of the above problems, a dynamic and static submarine cable provided by embodiments of the present invention includes a continuous cable core, wherein a first shielding layer is disposed outside the cable core, a transition device is disposed in the first shielding layer corresponding to a transition section of the cable core, and one end of a second shielding layer is welded to the transition device, thereby realizing the transition from double shielding layers to a single shielding layer and ensuring the continuity of a production process of the dynamic and static submarine cable. Furthermore, the dynamic section and the static section can be in the same cable core, so that the dynamic and static submarine cable can be produced continuously without separate production, and therefore, it is not necessary to connect the dynamic cable core and the static cable core, thereby shortening the production cycle and reducing the transmission loss of the cable core. In order to make the above objectives, features, and advantages of the embodiments according to the present invention clearer and more understandable, the technical solutions in the embodiments according to the present invention are clearly and completely described below with reference to the accompanying drawings in the embodiments according to the present invention. Apparently, the described embodiments are only some, but not all, of the embodiments according to the present invention. All other embodiments obtained by those skilled in the art, without creative efforts based on the embodiments according to the present invention, shall fall within the scope of protection of the present invention.

As shown in Figure 1, an embodiment of the present invention provides a dynamic and static submarine cable, including a cable core 10, a first armor layer 20, a transition device 70, and a second armor layer 40. The cable core 10 includes a dynamic section 15, a static section 16, and a transition section 17 connecting the dynamic section 15 and the static section 16, and the dynamic section 15, the static section 16, and the transition section 17 are of an integral structure. The first armor layer 20 is wrapped outside the dynamic section 15, the static section 16, and the transition section 17. The transition device 70 is wrapped outside the first armor layer 20 corresponding to the transition section 17. The second shielding layer 40 is wrapped outside the first shielding layer 20 corresponding to the dynamic section 15, and has a first end covering part of the transition device 70 and is welded to an outer peripheral surface of the transition device 70.

The first end of the second shielding layer 40 is an end of the second shielding layer 40 near the static section 16, and a dynamic and static submarine cable section corresponding to the static section 16 may be understood as a static cable, such as a section C as shown in Figures 2 and 3; a dynamic and static submarine cable section corresponding to the dynamic section 15 may be understood as a dynamic cable, such as a section A as shown in Figures 2 and 3; and a dynamic and static submarine cable section corresponding to the transition section 17 may be understood as a transition cable, such as a section B as shown in Figures 2 and 3. The transition device 70 may be ring-shaped, and the ring-shaped transition device 70 is wrapped outside the first shielding layer 20 corresponding to the transition section 17.

The dynamic and static submarine cable provided by the embodiment of the present invention has the cable core 10. The dynamic section 15, the static section 16 and the transition section 17 in the cable core 10 are of an integral structure. The first shielding layer 20 is provided on the outside of the cable core 10. By arranging the transition device 70 on the first shielding layer 20 corresponding to the transition section 17, and welding one end of the second shielding layer 40 to the transition device 70, the transition from the shielding layer of the dynamic section to the shielding layer of the static section can be completed, thereby ensuring the continuity of the production process of the dynamic and static submarine cable. With such an arrangement, the dynamic section and the static section can be in the same cable core, so that the dynamic and static submarine cable can be produced continuously without separate production, and therefore, it is not necessary to connect the dynamic cable core and the static cable core, thus shortening the production cycle and reducing the transmission loss of the cable core 10.

Referring to Figure 4, the dynamic and static submarine cable provided by the embodiment of the present invention includes the cable core 10. The cable core 10 includes a plurality of electrical units 11 and a plurality of optical units 12, and the plurality of electrical units 11 and the plurality of optical units 12 are twisted.

The electric units 11 are applicable to conduct electricity and transmit signals, and the number of the electric units 11 may be 1, 2, 3, etc. In this embodiment, the number of the electric units 11 is 3. The number of the optical units 12 may be 1, 2, 3, etc. In this embodiment, the number of the optical units 12 is 2.

Referring to Figure 5, in a specific embodiment, each electric unit 11 includes, from inside to outside in a radial direction, an electric unit core, an inner semiconductive shielding layer 112, an insulating layer 113, an outer semiconductive shielding layer 114, a semiconductive water blocking layer 115, a metallic shielding layer 116, and a phase dividing sheath layer 117, where the electric unit core includes a plurality of stranded conductors 111. The conductors 111 may be copper conductors, aluminum conductors, or the like.

The inner semiconducting shielding layer 112 covers an outer peripheral surface of the electrical unit core and may be used to prevent partial discharge between the conductors 111 and the insulating layer 113. The insulating layer 113 covers an outer peripheral surface of the inner semiconducting shielding layer 112, and may be used to insulate the electrical unit core from the external environment or from adjacent electrical unit cores, thereby ensuring the electrical performance of the dynamic and static submarine cable. For example, the insulating layer 113 may be formed by extrusion coating.

The outer semiconductor shielding layer 114 covers an outer peripheral surface of the insulating layer 113, and can be used to prevent partial discharge between the insulating layer 113 and the metal shielding layer 116 due to defects such as cracks on a surface of the insulating layer 113. The semiconductor water-blocking layer 115 covers an outer peripheral surface of the outer semiconductor shielding layer 114, and can perform the function of blocking water. The metal shielding layer 116 covers an outer peripheral surface of the semiconductor water-blocking layer 115. The metal shielding layer 116 may be a copper tape shielding layer, a steel tape shielding layer, an aluminum-plastic composite tape shielding layer, and other composite tape shielding layers, and can shield electromagnetic interference. The phase-splitting sheath layer 117 covers an outer peripheral surface of the metal shielding layer 116, which can prevent direct contact between the metal shielding layers 116 of the plurality of electric units, thereby preventing abrasion between the metal shielding layers 116 of the plurality of electric units and playing a role of water resistance and blocking water. In this embodiment, the phase-splitting sheath layer 117 is an extruded sheath layer.

The optical unit 12 provided by an embodiment of the present invention includes an optical fiber 121 and a shielding layer covering an outer peripheral surface of the optical fiber 121, and the optical unit can be used to transmit signals. For example, referring to Figure 6, the optical unit includes an outer casing 123 and a plurality of optical fibers 121 disposed within the outer casing. The outer casing may be a stainless steel tube. Water-blocking fillers 122 are further disposed between the plurality of optical fibers 121 in the outer casing 123. Along a radial direction of the outer casing 123, an outer peripheral surface of the outer casing 123 is sequentially covered with an inner semiconducting sleeve 124, an optical unit shielding layer 125; a water-blocking tape 126; and an outer semiconducting sleeve 127.

In some embodiments, not covered by the claims, the cable core 10 further includes a central reinforcing element, and the plurality of optical units 11 and the plurality of electrical units 12 are braided around the central reinforcing element. The central reinforcing element may be a metallic wire or a non-metallic wire. The tensile strength and balance of the cable core 10 may be improved by providing the central reinforcing element.

Furthermore, in embodiments not covered by the claims, the cable core 10 further includes fillers 13 that fill the braided gaps between the plurality of optical units 12 and the plurality of electrical units 11, and the fillers 13 may be filler strips, filler cords and the like.

Referring to Figure 4, in some specific embodiments, the cable core 10 further includes a first sheath layer 14, and the first sheath layer 14 covers the exterior of the braided electrical units 11 and the optical units 12. The arrangement of the first sheath layer 14, not covered by the claims, can ensure the water-blocking performance of the cable core 10. In this embodiment, the first sheath layer 14 is an extruded sheath layer.

Referring to Figure 1, the cable core 10 provided by the embodiment of the present invention includes axially connecting the dynamic section 15, the static section 16, and the transition section 17 connecting the dynamic section 15 and the static section 16, and the dynamic section 15, the static section 16, and the transition section 17 are of an integral structure, where the dynamic section 15 corresponds to a dynamic cable and the static section 16 corresponds to a static cable. With such an arrangement, during the manufacturing process, the cable cores of the dynamic cable and the static cable can be produced continuously without separate manufacturing, thereby shortening the production cycle. It is also not necessary to connect the dynamic cable core and the static cable core, which reduces the transmission loss of the cable core 10 and improves the performance stability of the cable core 10.

The first armor layer 20 is wrapped outside the dynamic section 15, the static section 16 and the transition section 17, and the first armor layer 20 is continuous. Both the first armor layer 20 and the second armor layer 40 can be formed by braiding or interlacing metal wires such as steel wires. With such an arrangement, in the manufacturing process, the first armor layer 20 of the dynamic and static submarine cable can be produced continuously without separate manufacturing, thereby shortening the production cycle.

1, 7 and 8, the dynamic and static submarine cable provided by the embodiment of the present invention further includes the transition device 70 and the second armor layer 40. The transition device 70 is wrapped outside the first armor layer 20 corresponding to the transition section 17. The second armor layer 40 is wrapped outside the first armor layer 20 corresponding to the dynamic section 15. The first end of the second armor layer 40 covers part of the transition device 70 and is welded to the outer peripheral surface of the transition device 70. With such an arrangement, the transition between the armor layer of the dynamic cable and the armor layer of the static cable can be realized.

Furthermore, in embodiments not covered by the claims, an inner cushion layer 30 may also be provided between the second armor layer 40 and the first armor layer 20. With such an arrangement, direct contact between the second armor layer 40 and the first armor layer 20 can be avoided, and thereby mutual abrasion between the second armor layer 40 and the first armor layer 20 is avoided.

Referring to Figure 7, in some embodiments, an outer peripheral surface of the second shielding layer 40 is further covered with a second sheath layer 50. The second sheath layer 50 may be an extruded sheath layer, and the material of the second sheath layer 50 may be PE material. An outer peripheral surface of the first shielding layer 20 corresponding to the static section 16 is further covered with a third sheath layer 60. The third sheath layer 60 may be a wrap-around sheath layer, and the material of the third sheath layer 60 may be a PP winding cord.

According to the invention, referring to Figure 9, the transition device 70 includes a heat transfer unit and a welding unit 71. The heat transfer unit covers an exterior of the first shielding layer 20 corresponding to the transition section 17, and the welding unit 71 is an annular structure and is wrapped outside the heat transfer unit. The first end of the second shielding layer 40 is welded to an outer peripheral surface of the welding unit 71. The heat transfer unit can release heat during a welding process and, at the same time, acts as an insulation buffer layer to ensure the quality of the welding. The heat transfer unit is a metal tape wrapped around an outer peripheral surface of the first shielding layer 20 corresponding to the transition section 17.

In some possible embodiments, an inner peripheral surface and an outer peripheral surface of the welding unit 71 are provided with an anti-corrosion coating, respectively. By providing the anti-corrosion coating, the corrosion resistance of the welding unit 71 can be improved, thereby increasing the service life of the welding unit 71. For example, the material of the anti-corrosion coating is a composite material with good stability, which can maintain good anti-corrosion performance in both high-temperature and low-temperature environments.

Referring to Figure 9, according to the invention, the welding unit 71 is of a half-ring type, including two half-ring portions 711. The two half-ring portions 711 have a split structure. The inner ring surfaces of the two half-ring portions 711 are opposite, and two ends of one half-ring portion 711 along a circumferential direction thereof are connected to two ends of the other half-ring portion 711 along a circumferential direction thereof in a one-to-one relationship. For example, one way of connecting the two half-ring portions 711 is by welding. With such an arrangement, the welding unit 71 can be directly wrapped outside the heat transfer unit, without inserting or moving the welding unit 71 from one end of the dynamic and static submarine cable to the outside of the heat transfer unit along an axis of the dynamic and static submarine cable, and the operation is therefore more convenient.

Furthermore, along an axial direction of each half-ring portion 711, each half-ring portion 711 includes a weld attachment area 712 and two smooth transition areas 713 respectively connected to two ends of the weld attachment area 712. The thickness of the weld attachment area 712 is greater than the thickness of the smooth transition areas 713. The first end of the second shielding layer 40 is welded to an outer peripheral surface of the weld attachment area 712. With such an arrangement, heat generated during a welding process of the first end of the second shielding layer 40 can be better transferred.

Referring to Figure 10, in some specific embodiments, along the axial direction of each half-ring portion 711, the thickness of the half-ring portion 711 changes continuously, that is, the thicknesses at the joints between the smooth transition areas 713 and the weld attachment area 712 do not change abruptly.

Furthermore, referring to Figure 10, in an axial cross-section of each half-ring portion 711, the thicknesses of the smooth transition areas 713 decrease linearly along a direction away from the weld attachment area 712. With such an arrangement, the metal wires at the first end of the second shielding layer 40 can better fit the welding unit 71, thereby improving the strength and stability of the weld.

Furthermore, along the axial direction of each half-ring portion 711, the thickness of the solder attachment area does not change. In the axial cross-section of each half-ring portion 711, the minimum thickness of each of the smooth transition areas 713 is 20% of the thickness of the solder attachment area 712. The axial cross-section is a cross-section of an axis passing through the half-ring portion 711. Referring to FIG. 10, the minimum thickness of the smooth transition areas 713 is at the ends of the smooth transition areas 713 remote from the solder attachment area 712. Such an arrangement can not only make the metal wires at the first end of the second shielding layer 40 better fit with the soldering unit 71, but also quickly conduct and reduce the welding heat and avoid damaging the structure of the cable core 10.

In some embodiments, the half-ring portion 711 has an outwardly projecting middle portion in the shape of a circular arc. Along the axial direction of the half-ring portion 711, the thickness of the circular arc-shaped structure located at an edge of the half-ring portion is equal to 20% of the thickness of the circular arc-shaped structure located at the center of the half-ring portion.

For example, a welding point between the first end of the second shielding layer 40 and the weld attachment area 712 is further coated with an anti-corrosion coating to improve the anti-corrosion performance at the welding point. For the material of the anti-corrosion coating, reference may be made to the above description.

In some other specific embodiments, referring to Figure 11, along the axial direction of the half-ring portion 711, the thickness of the weld attachment area 712 and the thicknesses of the smooth transition areas 713 are all constant, and the thicknesses of the smooth transition areas 713 are equal to 20% of the thickness of the weld attachment area 712, and a transition portion is further disposed between the weld attachment area 712 and each smooth transition area 713.

Claim 7 of the present invention further provides a method for manufacturing a dynamic and static submarine cable, including:

providing a cable core, which includes a dynamic section, a static section and a transition section connecting the dynamic section and the static section, where the dynamic section, the static section and the transition section are of an integral structure due to which the cable core can be produced continuously; marking the demarcation points of the dynamic section, the static section and the transition section on an outer peripheral surface of the dynamic section, an outer peripheral surface of the static section and an outer peripheral surface of the transition section, respectively;

braiding a first layer of shielding over an outer peripheral surface of the cable core;

winding a metal tape around an outer peripheral surface of the first shielding layer corresponding to the transition section, to form a heat transfer unit, where, by way of example, the metal tape is wound uniformly around the outer peripheral surface of the first shielding layer corresponding to the transition section;

having a welding unit wrapped on an outer peripheral surface of the heat transfer unit;

braiding a second shielding layer onto an outer peripheral surface of the first shielding layer corresponding to the dynamic section, and causing a first end of the second shielding layer to cover part of the welding unit; and

welding the first end of the second shielding layer to an outer peripheral surface of the welding unit, wherein the welding unit comprises two half-ring portions, and each of the half-ring portions comprises, along its axial direction, a weld attachment area and two smooth transition areas respectively connected to two ends of the weld attachment area; and wherein the thickness of the weld attachment area is greater than the thickness of the smooth transition areas, and the first end of the second shielding layer is welded to an outer peripheral surface of the weld attachment area.

The method for manufacturing the dynamic and static submarine cable provided by the invention does not require separate production of the dynamic cable and the static cable or connection of the dynamic cable core and the static cable core, which shortens the production cycle and reduces the transmission loss of the cable core.

As an example, for the structures and materials of the cable core and the welding unit in the aforementioned method embodiments, reference can be made to the aforementioned product embodiments, which will not be repeated here.

According to the invention, in the step of having the welding unit wrapped on the outer peripheral surface of the heat transfer unit, the welding unit includes two semi-annular portions. The two half-ring portions have a split structure. The inner ring surfaces of the two half-ring portions are opposite, and two ends of one half-ring portion along a circumferential direction thereof are connected to two ends of the other half-ring portion along a circumferential direction thereof in a one-to-one relationship. For example, a spot welding machine may be used to weld the two half-ring portions, so as to fix a position of the welding unit.

For example, in the step of welding the first end of the second shielding layer to the outer peripheral surface of the welding unit, the first end of the second shielding layer is welded to the welding fixture area of the welding unit, with the weld spots evenly distributed. During the welding process, the metal wires at the first end of the second shielding layer fit snugly into the smooth transition areas to ensure a reliable and stable welding process. Furthermore, a position of the second shielding layer is reserved and confirmed before welding. The welding position is located in the center of the welding fixture area. After welding is completed, an anti-corrosion coating can be applied to the outside of the weld spots.

After the stage of welding the first end of the second shielding layer to the outer peripheral surface of the welding unit, the following is also included:

having a second sheath layer covering an outer peripheral surface of the second armor layer; and

having a third layer of sheath covering an outer peripheral surface of the first layer of armor corresponding to the static section.

By way of example, for the structures of the second sheath layer and the third sheath layer, reference can be made to the product embodiments mentioned above, which will not be repeated here.

In some embodiments, not covered by the claims, the armor layers of the dynamic and static submarine cable include not only the first armor layer and the second armor layer, but also a third armor layer, a fourth armor layer, etc. At this point, after the step of welding the first end of the second armor layer to the outer peripheral surface of the welding unit, the following are further included: having another transition device wrapped outside the second armor layer, so that the further transition device can be sleeved at any position outside the second armor layer, and for the structure of the further transition device, reference may be made to the aforementioned product embodiments, which will not be repeated here; and then braiding the third armor layer onto the outer peripheral surface of the second armor layer and welding a first end of the third armor layer to an outer peripheral surface of this outermost welding unit, with a second end of the third armor layer aligned with an end of the second armor layer. Similarly, the above steps can be repeated when more layers of armor are included, such as a fourth layer of armor and a fifth layer of armor.

Embodiments or implementations of this specification are described in a progressive manner. The description of each embodiment focuses on its differences from other embodiments, and references may be made to each other for identical or similar aspects among the respective embodiments.

It should be understood by those skilled in the art that in describing the present invention, terms such as “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, and “outer”, etc., refer to orientations or positional relationships based upon the orientations or positional relationships illustrated in the accompanying drawings, which are solely for the purpose of facilitating and simplifying descriptions of the present invention, rather than indicating or implying that the system or element referred to must have a particular orientation, or must be constructed and operated in a particular orientation, and therefore, the foregoing terms should not be construed as limiting the present invention.

Reference throughout this specification to “an embodiment”, “some embodiments”, “an illustrative embodiment”, “an example”, “a specific example”, or “some examples” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. Therefore, indicative descriptions of the foregoing terms herein do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims (7)

i. A dynamic and static submarine cable, comprising: a cable core (10) comprising: a dynamic section (15), a static section (16), and a transition section (17) connecting the dynamic section (15) and the static section (16), wherein the dynamic section (15), the static section (16) and the transition section (17) have an integral structure; a first layer (20) of shielding wrapped outside the dynamic section (15), the static section (16) and the transition section (17); and a second layer (40) of shielding wrapped outside the first layer (20) of shielding corresponding to the dynamic section (15), characterized by also including: a transition device (70) wrapped outside the first shielding layer (20) corresponding to the transition section (17); and the second shielding layer (40) has a first end that covers part of the transition device (70) and is welded to an outer peripheral surface of the transition device (70); wherein the transition device (70) comprises a heat transfer unit and a welding unit (71), and the heat transfer unit covers an exterior of the first shielding layer (20) corresponding to the transition section (17); the welding unit (71) comprises an annular structure and is wrapped outside the heat transfer unit; and the first end of the second shielding layer (40) is welded to an outer peripheral surface of the welding unit (71); wherein the welding unit (71) comprises two half-ring portions (711), and each of the half-ring portions (711) comprises, along its axial direction, a weld fixing area (712) and two smooth transition areas (713) respectively connected to two ends of the weld fixing area (712); and wherein the thickness of the weld fixing area (712) is greater than the thickness of the smooth transition areas (713), and the first end of the second shielding layer (40) is welded to an outer peripheral surface of the weld fixing area (712). 2. The dynamic and static submarine cable according to claim 1, wherein an inner peripheral surface and the outer peripheral surface of the welding unit (71) are respectively provided with an anti-corrosion coating. 3. The dynamic and static submarine cable according to claim 1, wherein, in an axial cross section of each of the half-ring portions (711), thicknesses of the smooth transition areas (713) decrease linearly along a direction away from the weld attachment area (712). 4. The dynamic and static submarine cable according to claim 3, wherein the minimum thickness of each of the smooth transition areas (713) is 20% of the thickness of the weld fixation area (712). 5. The dynamic and static submarine cable according to any one of claims 1 to 4, wherein the cable core (10) comprises a plurality of electrical units (11) and a plurality of optical units (12), and the plurality of electrical units (11) and the plurality of optical units (12) are twisted; Each of the electric units (11) comprises, from inside to outside in a radial direction, an electric unit core, an inner semiconductive shielding layer (112), an insulating layer (113), an outer semiconductive shielding layer (114), a semiconductive water-blocking layer (115), a metallic shielding layer (116), and a phase-dividing sheath layer (117), wherein the electric unit core comprises a plurality of stranded conductors (111); and Each of the optical units (12) comprises an optical fiber (121) and a protective layer covering an outer peripheral surface of the optical fiber (121). 6. The dynamic and static submarine cable according to claim 5, wherein the cable core (10) further comprises a first sheath layer (14), and the first sheath layer (14) covers the exterior of the braided electrical units (11) and optical units (12). 7. A method for manufacturing a dynamic and static submarine cable, comprising the following steps: providing a cable core (10) comprising a dynamic section (15), a static section (16) and a transition section (17) connecting the dynamic section (15) and the static section (16), wherein the dynamic section (15), the static section (16) and the transition section (17) have an integral structure; marking the demarcation points of the dynamic section (15), the static section (16) and the transition section (17) on an outer peripheral surface of the cable core (10); braiding a first layer (20) of shielding on an outer peripheral surface of the dynamic section (15), on an outer peripheral surface of the static section (16) and on an outer peripheral surface of the transition section (17); wrapping a metal tape around an outer peripheral surface of the first shielding layer (20) corresponding to the transition section (17), to form a heat transfer unit; wrapping a welding unit (71) on an outer peripheral surface of the heat transfer unit; braiding a second shielding layer (40) onto an outer peripheral surface of the first shielding layer (20) corresponding to the dynamic section (15), and causing a first end of the second shielding layer (40) to cover part of the welding unit (71); and welding the first end of the second shielding layer (40) to an outer peripheral surface of the welding unit (71); wherein the welding unit (71) comprises two half-ring portions (711), and each of the half-ring portions (711) comprises, along its axial direction, a welding fixing area (712) and two smooth transition areas (713) respectively connected to two ends of the welding fixing area (712); and wherein the thickness of the weld fixing area (712) is greater than the thickness of the smooth transition areas (713), and the first end of the second shielding layer (40) is welded to an outer peripheral surface of the weld fixing area (712). The method for manufacturing the dynamic and static submarine cable according to claim 7, wherein after the step of welding the first end of the second shielding layer (40) to the welding unit (71), the method further comprises: covering with a second layer (50) of sheath an outer peripheral surface of the second shielding layer (40); and cover with a third layer of sheath (60) an outer peripheral surface of the first layer (20) of shielding corresponding to the static section (16).