A DC submarine cable

Abstract

The present invention belongs to the technical field of electric wires and cables, and discloses a DC submarine cable, comprising a wire core, a coating layer, a shielding layer and an outer sheath arranged in sequence from the inside to the outside, an insulating layer wrapped around the wire core, an inner sheath arranged between the shielding layer and the outer sheath, an armor layer arranged between the inner sheath and the outer sheath, a water-blocking layer arranged between the inner sheath and the shielding layer, and the water-blocking layer is a water-blocking yarn wrapped around the shielding layer. The present invention solves the problem that the existing submarine cable is easily squeezed when subjected to a large pressure, thereby affecting the transmission effect.

Description

Technical Field

[0001] The invention belongs to the technical field of electric wires and cables, and in particular relates to a direct current submarine cable. Background Art

[0002] Submarine cables are cables wrapped in insulating materials and laid on the seabed for telecommunication transmission. Submarine cables are mainly used in long-distance communication networks, usually between distant islands, cross-sea military facilities and other important occasions. They are one of the most important equipment in submarine power transmission projects.

[0003] When submarine cables are in use, they are located on the seabed and are subject to great pressure, which will cause compression of the submarine cables, leading to local collapse or deformation, and the internal cores being squeezed, affecting the transmission effect. Moreover, after being squeezed, the probability of breakdown is high, and water will penetrate, leading to corrosion of the internal cores, local leakage, and greater power loss. Summary of the invention

[0004] The present invention is intended to provide a direct current submarine cable to solve the problem that the existing submarine cable is easily squeezed when subjected to a large pressure, thereby affecting the transmission effect.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a DC submarine cable, comprising a core, a coating layer, a shielding layer and an outer sheath arranged in sequence from the inside to the outside, an insulating layer wrapped around the core, an inner sheath arranged between the shielding layer and the outer sheath, an armor layer arranged between the inner sheath and the outer sheath, a water-blocking layer arranged between the inner sheath and the shielding layer, and the water-blocking layer is a water-blocking yarn wrapped outside the shielding layer.

[0006] In the above technical solution, by arranging the armor layer between the inner sheath and the outer sheath, it can withstand greater pressure, reduce the probability of sheath damage, and thus reduce the probability of water ingress. And by arranging the water-blocking layer between the inner sheath and the shielding layer, it can prevent external water from entering the cable, so even if the inner sheath and the outer sheath are damaged, it can still play a waterproof role.

[0007] In another preferred embodiment of the present invention, the water-blocking layer further comprises a reinforcing tube arranged outside the water-blocking yarn, a plurality of water-absorbing holes are arranged on the outer periphery of the reinforcing tube, and the reinforcing tube is filled with molecular sieve.

[0008] In another preferred embodiment of the present invention, the gaps between the reinforcement tubes are filled with a filling layer.

[0009] In another preferred embodiment of the present invention, the armor layer includes a steel frame fixed to the inner wall of the outer sheath and a support member arranged between the steel frame and the inner sheath.

[0010] In another preferred embodiment of the present invention, the support member includes a support rod and a buffer component, and the support rod is arranged obliquely.

[0011] In another preferred embodiment of the present invention, the outer wall of the inner sleeve is provided with grooves whose number is the same as that of the support rods, a sliding sleeve is ball-jointed in the grooves, and the support rod is slidably connected in the sliding sleeve.

[0012] In another preferred embodiment of the present invention, the buffer component includes a buffer barrel fixed on a steel frame, both ends of the buffer barrel are closed, a slide plate is slidably connected inside the buffer barrel, a side wall of the buffer barrel is provided with channels whose two ends are respectively connected to the two ends of the buffer barrel, springs are provided at both ends of the slide plate and the two ends of the buffer barrel, a push rod passing through the buffer barrel is also fixed on the slide plate, the push rod is slidably connected to the buffer barrel, and the end of the push rod away from the slide plate is fixed on the inner sleeve.

[0013] In another preferred embodiment of the present invention, two channels are provided, and one-way valves are provided in both channels, and the flow directions of the two one-way valves are opposite.

[0014] In another preferred embodiment of the present invention, the one-way valve comprises a conical barrel and a sealing ball capable of sealing the conical barrel, and a spring is arranged between the sealing ball and the conical barrel.

[0015] In another preferred embodiment of the present invention, a plurality of buffer grooves are arranged on the outer side of the inner sheath, a steel wire layer is arranged in the buffer groove, and the push rod is fixed on the steel wire layer.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a longitudinal cross-sectional view of an embodiment of the present application.

[0019] Figure 2 It is a longitudinal cross-sectional view of the buffer component in the embodiment of the present application.

[0020] The figure marks in the drawings of the specification include: wire core 1, coating layer 2, shielding layer 3, water-blocking yarn 4, reinforcing tube 5, molecular sieve 6, filling block 7, inner sheath 8, outer sheath 9, steel frame 10, support rod 11, groove 12, sliding sleeve 13, buffer barrel 14, push rod 15, buffer groove 16, steel wire layer 17, slide plate 18, channel 19, one-way valve 20, conical barrel 21, sealing ball 22. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which 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 invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it is to be understood that the terms “longitudinal”, “lateral”, “vertical”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” 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 invention 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 invention.

[0023] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0024] The present invention provides a DC submarine cable, such as Figure 1 As shown, in a preferred embodiment of the present invention, it includes a core 1, a coating 2, a shielding layer 3, a water blocking layer, an inner sheath 8, an armor layer and an outer sheath 9 arranged in sequence from the inside to the outside. There are multiple cores 1, each of which is wrapped with an insulating layer, and the cores 1 wrapped with the insulating layer are twisted into a cable.

[0025] The water-blocking layer is a water-blocking yarn 4 wrapped outside the shielding layer 3. In this embodiment, the water-blocking yarn 4 is composited with polyester industrial filaments and cross-linked polyacrylic acid expansion materials. A reinforcing tube 5 is also provided on the outside of the water-blocking yarn 4, and the reinforcing tube 5 is wrapped outside the water-blocking yarn 4. A plurality of water absorption holes are provided on the outside of the reinforcing tube 5, and the reinforcing tube 5 is filled with a molecular sieve 6, which can absorb moisture and reduce the occurrence of water intrusion into the cable. A filling layer is provided between the gaps of the reinforcing tube 5, and the filling layer is a filling block 7. The outer side of the filling block 7 is arc-shaped and transitions to the outer arc of the reinforcing tube 5.

[0026] The armor layer includes a steel frame 10 fixed to the inner wall of the outer sheath 9 and a support member arranged between the steel frame 10 and the inner sheath 8. The support member includes a plurality of support rods 11 and a buffer component. The outer ends of the support rods 11 are fixed to the inner wall of the outer sheath 9, and the support rods 11 are all inclined in the same direction.

[0027] The outer periphery of the inner sheath 8 is provided with grooves 12 whose number is the same as the number of the support rods 11 . A sliding sleeve 13 is ball-hinged in the groove 12 , and the inner end of the support rod 11 is slidably connected in the sliding sleeve 13 .

[0028] Combination Figure 2 As shown, the buffer component includes a buffer barrel 14 fixed on the steel frame 10, both ends of the buffer barrel 14 are closed, a slide plate 18 is vertically slidably connected inside the buffer barrel 14, a push rod 15 is fixed to the bottom of the slide plate 18, and the push rod 15 passes through the bottom of the buffer barrel 14 and is vertically slidably connected to the buffer barrel 14. The outer periphery of the inner sheath 8 is provided with buffer grooves 16 with the same number as the push rods 15, and a steel wire layer 17 is provided in the buffer groove 16, and the inner end of the push rod 15 is fixed to the steel wire layer 17.

[0029] Springs are provided between both sides of the slide plate 18 and both ends of the buffer barrel 14. In this embodiment, the springs are compression springs, and the specific model is selected according to actual needs.

[0030] Two channels 19 are provided on the side wall of the buffer barrel 14 , and both ends of the channels 19 are respectively connected to the cavities of the buffer barrel 14 located on both sides of the slide plate 18 . A one-way valve 20 is provided in each of the two channels 19 , and the flow directions of the two one-way valves 20 are opposite.

[0031] The one-way valve 20 includes a conical barrel 21 and a sealing ball 22 capable of sealing the conical barrel 21 . A spring is provided between the sealing ball 22 and the conical barrel 21 . The large diameter ends of the conical barrels 21 in the two passages 19 face opposite directions.

[0032] The specific implementation process is as follows:

[0033] After the DC submarine cable is installed on the seabed, the outer sheath 9 on the outside of the cable is squeezed due to the water pressure in the seabed, so that the outer sheath 9 has a tendency to squeeze inward, and under the protection of the armor layer, the squeezing of the inner core 1 of the cable can be reduced, thereby reducing the probability of cable damage; at the same time, under the action of the reinforcing tube 5, the strength of the cable can also be increased, thereby reducing the probability of cable damage. And after the outer sheath 9 is squeezed, the steel frame 10 will move inward, and it will be supported by the support rod 11 and buffered by the buffer component.

[0034] As the steel frame 10 is subjected to the extrusion force, it will squeeze the buffer barrel 14 and cooperate with the push rod 15 to make the slide plate 18 slide relative to the buffer barrel 14. Under the dual buffering of the spring and air pressure, the bracket is prevented from causing impact on the inner sheath 8, thereby reducing the damage to the inner sheath 8 and the outer sheath 9, and thus reducing the probability of moisture penetration.

[0035] During the use of the cable, even if the outer sheath 9 and the inner sheath 8 are damaged and water penetrates, the molecular sieve 6 in the reinforcing tube 5 can absorb the water to prevent it from continuing to penetrate into the interior. At the same time, the water-blocking yarn 4 can also prevent water from penetrating into the interior, thereby increasing the service life of the cable.

[0036] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. 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 invention. 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] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A DC submarine cable, comprising a core, a coating, a shielding layer and an outer sheath arranged in sequence from the inside to the outside, and an insulating layer wrapped around the core, characterized in that: An inner sheath is also arranged between the shielding layer and the outer sheath, and an armor layer is arranged between the inner sheath and the outer sheath, the armor layer includes a steel frame fixed to the inner wall of the outer sheath and a support member arranged between the steel frame and the inner sheath, the support member includes a support rod and a buffer component, the support rod is arranged obliquely, the buffer component includes a buffer barrel fixed to the steel frame, both ends of the buffer barrel are closed, a slide plate is slidably connected in the buffer barrel, a channel is arranged on the side wall of the buffer barrel, both ends of which are connected to the two ends of the buffer barrel respectively, springs are arranged at both ends of the slide plate and the two ends of the buffer barrel, a push rod penetrating the buffer barrel is also fixed on the slide plate, the push rod is slidably connected to the buffer barrel, and one end of the push rod away from the slide plate is fixed to the inner sheath; A water-blocking layer is arranged between the inner sheath and the shielding layer. The water-blocking layer is a water-blocking yarn wrapped outside the shielding layer. A reinforcing tube is also arranged outside the water-blocking yarn. The reinforcing tube is wrapped outside the water-blocking yarn. The reinforcing tube is filled with molecular sieves, and the gaps between the reinforcing tubes are filled with a filling layer.

2. A DC submarine cable according to claim 1, characterized in that: The outer wall of the inner protective sleeve is provided with grooves whose number is the same as that of the support rods, and a sliding sleeve is ball-hinged in the grooves, and the support rod is slidably connected in the sliding sleeve.

3. A DC submarine cable according to claim 2, characterized in that: Two channels are provided, and one-way valves are provided in both channels, and the flow directions of the two one-way valves are opposite.

4. A DC submarine cable according to claim 3, characterized in that: The one-way valve comprises a conical barrel and a sealing ball which can seal the conical barrel, and a spring is arranged between the sealing ball and the conical barrel.

5. A DC submarine cable according to claim 4, characterized in that: A plurality of buffer grooves are arranged on the outer side of the inner sheath, a steel wire layer is arranged in the buffer groove, and the push rod is fixed on the steel wire layer.

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