CN213025508U - Water-blocking cable - Google Patents

Abstract

The utility model discloses a water-blocking cable, include electric core and wrap up internal shield layer, insulating layer, outer shielding layer, metallic shield, chain armor, the oversheath outside electric core in proper order, still include first vertical water-blocking layer, the vertical water-blocking layer of second, the vertical water-blocking layer of third, first vertical water-blocking layer parcel is between metallic shield and radial water-blocking layer, the vertical water-blocking layer parcel of second is between radial water-blocking layer and chain armor, the vertical water-blocking layer of third is established between chain armor and oversheath, the radial water-blocking layer that still is equipped with between metallic shield and the chain armor, electric core inner layer parcel has the semi-conductive water-blocking area. The inner layer of the electric core longitudinally wraps the semi-conductive water blocking tape to adhere water blocking powder, so that the conductor is ensured to have a comprehensive good water blocking effect, longitudinal water blocking and radial water blocking are combined, the comprehensive water blocking capability of the cable is enhanced, and the inner and outer shielding layers and the metal shielding layer form good electromagnetic and physical interference resistance.

Description

Water-blocking cable

Technical Field

The utility model relates to a cable field especially relates to a cable blocks water.

Background

With the development of the power industry, the variety of cables is in a diversified development trend, the cables are developed from simple power transmission to multiple functions, and with the deepening of research and understanding on insulation water absorption and water trees, people are more and more aware of the importance of waterproof performance on medium and high voltage power cables and are also concerned. The waterproof cable of prior art adopts the cable of waterproof layers such as cladding thin metal waterproof tape, in case injured, water just invades the cable inside from the injury, thereby infiltrates the cable clearance thereby leads to the unable problem of using of long cable. For example, a "lightweight medium-voltage waterproof cable" disclosed in chinese patent literature includes a copper conductor, a water-blocking powder layer, an outer shielding layer, a metal shielding layer, a water-blocking layer, and a protective sheath are sequentially wrapped outside the copper conductor, the water-blocking layer includes two water-blocking tapes and a plurality of fillers disposed between the two water-blocking tapes, and a gap between the fillers is filled with water-blocking powder. The utility model discloses the copper conductor outside of cable sets up the bisque that blocks water, the powder that blocks water can the inflation solidify when meeting water, play the effect of the division wall that blocks water, can effectively prevent the entering of moisture, and the powder that blocks water is very light when not meeting water, can increase the weight of cable and not increase the external diameter of cable almost, in addition, set up the filling member in the layer that blocks water of cable, the density of filling member can be set for according to the density of the liquid that the cable immerged at the workplace, it can float on the liquid level when can making the cable fall into liquid, further improve waterproof nature. Although the method of wrapping the water absorbing material around the gap part is used, the method saves necessary inner screens in order to reduce weight, and has the problems of weak metal shielding layer, poor anti-interference capability, weak environmental interference resistance and incapability of ensuring the water resistance of long-term underwater laying or direct-buried laying in a wet area.

Disclosure of Invention

The utility model discloses current waterproof cable has mainly been solved, a vertically block water and radially block water and combine together and have the conductor ability of blocking water, the cable that blocks water of electromagnetism and physical interference performance ability soaking aquatic and keeping the ability of blocking water for a long time.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a water-blocking cable, includes electric core and wraps up in proper order at the outer internal shield layer of electric core, insulating layer, outer shielding layer, metallic shield, chain armor, oversheath, still includes first vertical water-blocking layer, the vertical water-blocking layer of second, the vertical water-blocking layer of third, first vertical water-blocking layer parcel is between metallic shield and radial water-blocking layer, the vertical water-blocking layer parcel of second is between radial water-blocking layer and chain armor, the vertical water-blocking layer of third is established between chain armor and oversheath, the radial water-blocking layer that still is equipped with between metallic shield and the chain armor, electric core inner layer parcel has the semi-conductive water-blocking area. The insulating layer is made of crosslinked polyethylene insulating material for crosslinked cables with the voltage of 35kV or below, the crosslinked polyethylene has good physical properties and electrical properties such as tensile property, bending resistance, vibration resistance, torsion resistance and the like, the cable is always kept at a high temperature of about 90 ℃ after stable operation, and the crosslinked polyethylene has good heat resistance.

Preferably, the electric core adopts a compressed regular stranded conductor, and a semi-conductive water-blocking tape is wrapped between stranded layers in the conductor. The conductor chooses 2 types to sticis the conductor for use, adopts the mode of formal transposition, except conductor center layer and outmost, every other intertwist layer interlayer all indulges the package one deck semiconduction water-blocking tape and adds the powder that blocks water, solves the conductor problem of blocking water when realizing the outer comprehensive characteristic that blocks water of cable, because there is the clearance between the electric core conductor transposition layer, guarantees the water-blocking capability of conductor, sticiss to adopt semiconduction water-blocking tape and the powder that blocks water to reach good conductor effect of blocking water mutually between the transposition conductor.

Preferably, the radial water-blocking layer comprises an aluminum-plastic composite belt and an inner sheath, and the inner sheath is extruded on the outer surface of the aluminum-plastic composite belt. The sheath is longitudinally wrapped with a layer of aluminum-plastic composite tape, the longitudinal wrapping is tight and complete, the longitudinal bending of the lap seam of the longitudinal wrapping, namely the edge of the composite tape, is eliminated, the perfect adhesion of the composite tape to the polyethylene inner sheath and the composite tape seam of the polyethylene inner sheath is ensured, the complete sealing of the composite tape seam is ensured, the moisture can be well blocked, and the radial water blocking capacity required by underwater cable laying or particularly humid environment laying is achieved.

Preferably, the first longitudinal water-blocking layer comprises a double-sided water-blocking tape, and the double-sided water-blocking tape is wrapped on the outer surface of the metal shielding layer. The double-sided water blocking tape is filled between the metal shielding layer and the aluminum-plastic composite layer, a gap between the aluminum-plastic composite tape and the metal shielding layer is filled, the water blocking tape can expand rapidly when meeting water, the process is simple as a water blocking material around the wrapping water blocking tape, construction is convenient, and production efficiency is high.

Preferably, the second longitudinal water-blocking layer comprises a double-layer double-sided water-blocking tape, and the double-layer double-sided water-blocking tape wraps the outer surface of the inner sheath. The double-deck two-sided water-blocking tape fills the space between inner sheath and the chain armor, and the double-deck crooked damage inner sheath of chain armor when preventing that the cable bending from laying around the package, and the water-blocking tape water swelling prevents that moisture from invading the cable, plays the outside radial effect of blocking water of inner sheath.

Preferably, the third longitudinal water-blocking layer comprises a double-sided water-blocking tape, and the double-sided water-blocking tape is arranged between the interlocking armor layer (8) and the outer sheath (10). The clearance between chain armor and the oversheath is filled to two-sided water blocking tape, and the water blocking tape meets water expansion and prevents that moisture from invading the cable, plays the outside vertical effect of blocking water of assurance chain armor.

Preferably, a semi-conductive buffer water-blocking tape is further arranged between the metal shielding layer and the outer shielding layer. On one hand, the semi-conductive buffer water-blocking tape has the same potential as the metal shielding layer and the outer shielding layer, the metal shielding layer passes through capacitance current when the cable normally runs, and when a system short circuit occurs, the metal shielding layer serves as a channel of short circuit current and plays a role in shielding an electric field; on the other hand, the semi-conductive buffering water-blocking tape has the characteristics of good hygroscopicity, large expansion rate, high expansion speed and high instant temperature resistance, and can actively absorb water and rapidly expand when the cable is filled with water, so that a channel for blocking the flow of water in the cable is achieved, and the water is prevented from being immersed into the outer shielding layer.

Preferably, the inner shielding layer and the outer shielding layer both adopt ultra-smooth semi-conductive shielding materials. The cable core is formed by twisting a plurality of conducting wires, an air gap is easily formed between the cable core and the insulating layer, the electric field concentration can be caused due to the unsmooth surface of the cable core, an inner shielding layer made of an ultra-smooth semi-conductive material is additionally arranged on the surface of the cable core, and the inner shielding layer has the same potential as the shielded cable core and is in good contact with the insulating layer, so that the local discharge between the cable core and the insulating layer is avoided; a gap may exist at the contact part of the surface of the insulating layer and the metal shielding layer, which is a factor causing partial discharge, so that an outer shielding layer made of a super-smooth semi-conductive material is added on the outer surface of the insulating layer, the outer shielding layer is in good contact with the shielded insulating layer and has the same potential as the metal shielding layer, and the partial discharge between the insulating layer and the adjacent layer is avoided.

Preferably, the outer sheath is made of halogen-free low-smoke high-flame-retardant olefin material. Compared with the original halogen-free low-smoke material, the halogen-free low-smoke high-flame-retardant olefin material has better moisture resistance, is more tightly wrapped than a halogen welding material, and has the characteristics of low smoke, no halogen, low corrosion, low toxicity and the like.

Preferably, the interlocking armor layer is made of nonmagnetic alloy materials. Chain armor adopts the AL-Mg alloy, and the alloy material has good resistance to compression, anti-electromagnetic interference and bending property on the one hand, and on the other hand, AL, Mg are non-magnetic material, can not produce the vortex, avoids the vortex to cause the cable to generate heat to the armor layer forms mechanical protection layer, improves the ability of preventing corroding, can adopt any kind of mode to lay, has higher mechanical strength.

Therefore, the utility model discloses following beneficial effect has: (1) the electric core stranded layer longitudinally wraps the semi-conductive water blocking tape to adhere water blocking powder, so that the conductor is ensured to have a comprehensive and good water blocking effect. (2) Longitudinal water blocking and radial water blocking are combined, and the comprehensive water blocking capability of the cable is enhanced. (3) The inner and outer shielding layers and the metal shielding layer have good electromagnetic and physical interference resistance.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure: 1. the battery comprises a battery core 2, an inner shielding layer 3, an insulating layer 5, a metal shielding layer 6, an aluminum-plastic composite tape 8, a linkage armor layer 10, an outer sheath 11, an outer shielding layer 13 and an inner sheath.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Example (b):

the embodiment provides a medium-voltage single-core waterproof direct-current cable which is suitable for a laying environment with high water resistance requirement when the cable is very wet or needs to be soaked in water for a long time. As shown in fig. 1, the cable core 1 adopts a second type of compressed stranded conductor, the conductor is longitudinally wrapped with a semi-conductive water-blocking tape, and water-blocking powder is adhered to the outer surface of the semi-conductive water-blocking tape. The conductor is formed by twisting and compressing a plurality of monofilaments in a regular twisting mode, a conductor center layer is formed by twisting and compressing 6 monofilaments in a second layer of 1 monofilament, the second layer surrounds the first layer and is tightly twisted, a third layer is 12 monofilaments, a semi-conductive water blocking tape is longitudinally wrapped between the third layer and the second layer and is wrapped with water blocking powder, a fourth layer is formed by twisting 18 monofilaments on the outer surface of the third layer, a semi-conductive water blocking tape is longitudinally wrapped between the fourth layer and the third layer, so that the conductor center layer and the outermost layer are removed, and each other twisting layer is longitudinally wrapped with a layer of water blocking tape and added with water blocking powder. During production, the beam tube directly penetrates through the towing mold, the cavity of the towing mold is filled with water-blocking powder, and the beam tube directly penetrates through the water-blocking powder, so that a layer of water-blocking powder is adhered to the surface of the beam tube, and the electric core 1 is ensured to have good water-blocking performance.

The outer surface of an electric core 1 is extruded and wrapped with a semi-conductive inner shielding layer 2, the outer surface of the inner shielding layer 2 is extruded and wrapped with an insulating layer 3, the outer surface of the insulating layer 3 is extruded and wrapped with a semi-conductive outer shielding layer 11, the insulating layer 3 is made of cross-linked polyethylene insulating material for a cross-linked cable of direct current 35kV and below, the cross-linked polyethylene has good physical properties and electrical properties such as tensile strength, bending resistance, vibration resistance, torsion resistance and the like, the cable is kept at a high temperature of about 90 ℃ after stable operation, the cross-linked polyethylene has good heat resistance, the inner shielding layer 2 and the outer shielding layer 11 are both made of ultra-smooth semi-conductive shielding materials, the cable electric core 1 is formed by twisting a plurality of wires, an air gap is easily formed between the cable core 1 and the insulating layer 3, the electric field concentration can be caused by unsmooth surface of the electric core 1, the inner shielding layer 2 made of the ultra-smooth semi-, thereby avoiding partial discharge between the battery cell 1 and the insulating layer 3; there may be a gap at the contact position between the surface of the insulating layer 3 and the metal shielding layer 5, which is a factor causing partial discharge, so that an outer shielding layer 11 made of ultra-smooth semi-conductive material is added on the outer surface of the insulating layer 3, and the outer shielding layer 11 is in good contact with the shielded insulating layer 3 and has the same potential as the metal shielding layer 5, thereby avoiding the partial discharge between the insulating layer 3 and the adjacent layer.

The outer surface of the outer shielding layer 11 is wrapped with a semi-conductive buffer water-blocking tape, the outer surface of the semi-conductive water-blocking tape is wrapped with a metal shielding layer 5, the metal shielding layer 5 is made of red copper materials, the semi-conductive buffer water-blocking tape has the same potential as the metal shielding layer 5 and the outer shielding layer 3 on one hand, when a cable normally runs, the metal shielding layer 5 passes through capacitance current, and when a system short circuit occurs, the metal shielding layer 5 serves as a short-circuit current channel and plays a role in shielding an electric field; on the other hand, the semi-conductive buffering water-blocking tape has the characteristics of good hygroscopicity, large expansion rate, high expansion speed and high instant temperature resistance, and can actively absorb water and rapidly expand when the cable is filled with water, so that a channel for blocking the flow of water in the cable is achieved, and the water is prevented from being immersed into the outer shielding layer 11.

The outer surface of the metal shielding layer 5 is wrapped with a double-sided water blocking tape, the outer surface of the double-sided water blocking tape is longitudinally wrapped with the aluminum-plastic composite tape 6, the outer surface of the aluminum-plastic composite tape 6 is extruded with the inner sheath 13, the aluminum-plastic composite tape 6 longitudinally wrapped in the inner sheath 13 is longitudinally wrapped, the longitudinal bending of the longitudinal wrapping lap seam, namely the edge of the composite tape, is eliminated, the perfect adhesion of the aluminum-plastic composite tape 6, the polyethylene inner sheath 13 and the aluminum-plastic composite tape 6 at the seam is ensured, the perfect sealing of the aluminum-plastic composite tape 6 at the seam is ensured, the water can be well blocked, the contact surface between the metal shielding layer 5 and the aluminum-plastic composite tape 6 is smooth, and the good longitudinal water blocking effect can be achieved by wrapping a double-sided water blocking tape.

The inner sheath 13 is wrapped with a double-layer double-sided water-blocking tape, the double-layer double-sided water-blocking tape is wrapped with a linkage armor layer 8, the outer surface of the linkage armor layer 8 is wrapped with a water-blocking tape, the outer surface of the water-blocking tape is wrapped with an outer sheath 10 in an extruded mode, and the outer sheath 10 and the inner sheath 13 are both made of halogen-free low-smoke high-flame-retardant olefin materials. Compared with the original halogen-free low-smoke material, the halogen-free low-smoke high-flame-retardant olefin material has better moisture resistance, is more tightly wrapped than a halogen welding material, and has the characteristics of low smoke, no halogen, low corrosion, low toxicity and the like. Chain armor 8 adopts AL-Mg alloy, and the alloy material has good resistance to compression, anti-electromagnetic interference and bending property on the one hand, and on the other hand, AL, Mg are non-magnetic material, can not produce the vortex, avoids the vortex to cause the cable to generate heat to chain armor 8 forms mechanical protection layer, improves the ability of preventing corroding, can adopt any kind of mode to lay, has higher mechanical strength.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although terms such as cell, insulation, shield, interlocking armor, jacket, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (10)

1. The utility model provides a water-blocking cable, includes electric core (1) and wraps up in proper order at electric core (1) outer internal shield layer (2), insulating layer (3), outer shielding layer (11), metallic shield (5), chain armor (8) and oversheath (10), characterized by still includes first vertical water-blocking layer, the vertical water-blocking layer of second, the vertical water-blocking layer of third, first vertical water-blocking layer parcel is between metallic shield (5) and radial water-blocking layer, the vertical water-blocking layer parcel of second is between radial water-blocking layer and chain armor (8), the vertical water-blocking layer of third is established between chain armor (8) and oversheath (10), the radial water-blocking layer that still is equipped with between metallic shield (5) and chain armor (8), electric core (1) inner wrap up has the semi-conductive water-blocking area.

2. A water-blocking cable according to claim 1, wherein the electric core (1) is a compressed regular stranded conductor, and a semi-conductive water-blocking tape is wrapped between stranded layers in the conductor.

3. A water-blocking cable according to claim 1, wherein said radial water-blocking layer comprises an aluminum-plastic composite tape (6) and an inner sheath (13), said inner sheath (13) being extruded on the outer surface of said aluminum-plastic composite tape (6).

4. A water-blocking cable according to claim 3, wherein the first longitudinal water-blocking layer comprises a double-sided water-blocking tape wrapped around the outer surface of the metallic shielding layer (5).

5. A water-blocking cable according to claim 1 or 3, wherein the second longitudinal water-blocking layer comprises a double-layer double-sided water-blocking tape wrapped around the outer surface of the inner jacket (13).

6. A water-blocking cable according to claim 1 or 4, wherein the third longitudinal water-blocking layer comprises a double-sided water-blocking tape provided between the interlocked armour layer (8) and the outer sheath (10).

7. A water-blocking cable according to claim 1 or 4, wherein a semi-conductive buffer water-blocking tape is further disposed between the metal shielding layer (5) and the outer shielding layer (11).

8. A water-blocking cable according to claim 1 or 4, wherein both the inner shield (2) and the outer shield (11) are made of ultra-smooth semi-conductive shielding material.

9. A water-blocking cable according to claim 1, wherein said outer sheath (10) is made of a halogen-free low-smoke highly flame-retardant olefin material.

10. A water-blocking cable as claimed in claim 1, wherein the interlocked armour layers (8) are of non-magnetic alloy material.

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