CN210865714U - Full water-blocking power cable - Google Patents
Full water-blocking power cable Download PDFInfo
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- CN210865714U CN210865714U CN201921824842.3U CN201921824842U CN210865714U CN 210865714 U CN210865714 U CN 210865714U CN 201921824842 U CN201921824842 U CN 201921824842U CN 210865714 U CN210865714 U CN 210865714U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The utility model discloses a full water-blocking power cable, wherein an insulating layer is coated on a metal cable core, a spiral cable core sealing belt is wound on the metal cable core, and a water-blocking belting layer, a nylon sheath layer, an armor layer and an outer sheath are sequentially coated on the insulating layer from inside to outside; one binding surface of the fan-shaped conductor is provided with a water-blocking groove, the other binding surface is provided with a water-blocking tenon, and the water-blocking tenon and the water-blocking groove on the adjacent fan-shaped conductor are in joggle joint; the armor steel band twines the overlap joint through the overlap joint section of both sides and becomes the armor, all is provided with sealed recess on the overlap joint section of armor steel band both sides, is provided with the armor sealing tape in the sealed recess of relative overlap joint, still is provided with location inserting groove and location inserting tenon on the overlap joint section, and this location inserting groove is identical with the cross sectional shape of location inserting tenon, and corresponding location inserting tenon is pegged graft in location inserting groove. The cable reliably prevents penetration of moisture both radially and longitudinally, and is particularly suitable for medium and high voltage power cables.
Description
Technical Field
The utility model relates to a power cable especially relates to a well high voltage power cable with radial waterproof and vertical block water.
Background
With the rapid growth of the economy of China and the further acceleration of the industrialization and urbanization processes, the power cable is more and more widely applied to the construction of infrastructures such as urban power grids. Due to the continuous progress of science and technology, medium and high voltage power cable lines are widely applied to crosslinked polyethylene insulated cables, crosslinked polyethylene has high electrical performance, high breakdown strength, high insulation resistance, small dielectric constant, and high heat resistance and chemical resistance, so that the transmission capacity of the cable insulated by crosslinked polyethylene is greatly increased, and the cable is light in weight.
However, crosslinked polyethylene power cables also have some disadvantages: the crosslinked power cable has poor pulse resistance and low corona resistance level, and particularly has the problem that the water permeability is always headache in the industry, and once the crosslinked polyethylene power cable is wetted by water, a plurality of hidden dangers are brought to the operation of the cable. After water enters the crosslinked polyethylene power cable, no matter the moisture on the surface of the plastic insulating layer or the surface of the conductor, insulation can cause 'water branches' along the direction of an electric field under the action of a strong electric field, the water branches cause the surface of the insulation to age, and meanwhile, the water branches gradually extend towards the inside of the insulation, and the situation can be accumulated in the inner layer of the insulation to generate an accumulation effect; after the water enters the cross-linked polyethylene power cable through the plastic outer sheath, the metal sheath can enter the water, chemical corrosion and electrochemical corrosion can be generated on the metal sheath, the metal sheath is damaged finally, the insulating layer is soaked by the water, and finally, the insulation aging and breakdown are caused.
The cable is damaged by mechanical stress during installation and use, or the cable is used for a long time in a humid and watery environment, so that external moisture gradually permeates into the cable; the waterproof structure of the cable is mainly a radial water-proof and longitudinal water-proof structure. At present, longitudinal water blocking of a power cable conductor is mainly realized by adding water blocking powder or water blocking yarns among strand layers of the conductor, and the added water blocking powder is complex in process and difficult to ensure uniform distribution, so that water blocking yarns are mostly adopted and are usually wound among the strand layers of metal wires at a certain pitch, and the water blocking yarns are discontinuously embedded into gaps of the metal single wires through a pressing process, so that a discontinuous water blocking structure is formed instead of a continuous conductor water blocking structure. The radial waterproof of the power cable is mainly realized by adopting a polyethylene sheath for waterproofing and longitudinally wrapping a double-sided aluminum-plastic composite belt, the radial waterproof is realized by the combined action of an aluminum-plastic composite belt and a semi-conductive water blocking belt for medium and high voltage power cables, the high voltage cable with higher voltage level is waterproof by adopting a metal sheath structure, but the waterproof of the polyethylene sheath and the semi-conductive water blocking belt is waterproof, the waterproof and water blocking performance of the high voltage power cable is linearly reduced once the high voltage power cable enters an aging period due to the influence of the laying bending of the cable, the formation of water absorption and water trees of an insulating layer can be accelerated, and a real airtight waterproof and water blocking space can not be formed due to the influence of the laying bending of the cable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a power cable blocks water entirely is provided, can not only prevent moisture and moisture reliably and invade along the radial infiltration of cable, also can avoid moisture and moisture effectively to follow the vertical infiltration of cable conductor and insulating direction moreover.
In order to solve the technical problem, the utility model aims to solve the technical problem of providing a full water-blocking power cable, which comprises a metal cable core, wherein the metal cable core is formed by twisting a plurality of fan-shaped conductors, an insulating layer is coated on the metal cable core, a spiral cable core sealing tape is wound on the metal cable core, and a water-blocking belting layer, a nylon sheath layer, an armor layer and an outer sheath are sequentially coated on the insulating layer from inside to outside; one attaching surface of each fan-shaped conductor is provided with a water blocking groove, the other attaching surface of each fan-shaped conductor is provided with a water blocking tenon, and the water blocking tenon and the water blocking groove on the adjacent fan-shaped conductors are in joggle joint; the armor steel band twines the overlap joint through the overlap joint section of both sides and becomes the armor, all be provided with sealed recess on the overlap joint section of armor steel band both sides, be provided with the armor sealing strip in relative overlap joint sealed recess, still be provided with location inserting groove and location tenon on the overlap joint section of armor steel band, this location inserting groove is identical with the cross sectional shape of location inserting tenon, be located location inserting groove and location inserting tenon on the homonymy overlap joint section and the mutual parallel arrangement of sealed recess of homonymy overlap joint section, corresponding location inserting tenon is pegged graft in the location inserting groove.
In the structure, firstly, a spiral cable core sealing tape is wound on the metal cable core and is positioned between the metal cable core and the insulating layer, and the cable core sealing tape enables a closed structure to be formed between the metal cable core conductor and the insulating sheath layer, so that longitudinal gaps possibly existing between the periphery of the metal cable core and the insulating sheath are completely eliminated and filled, and the permeation and diffusion of moisture and humidity to the insulating layer, the sheath layer and the metal conductor along the peripheral surface of the metal cable core are effectively prevented. The binding surfaces on the two sides of the fan-shaped conductors are respectively provided with the water-blocking tenon and the water-blocking groove which are mutually inserted, and the water-blocking tenon and the water-blocking groove of two adjacent fan-shaped conductors are mutually joggled, so that a tight water-blocking structure is formed in a joggled mode formed by the tenon and the groove, and then, the water and the moisture are prevented from permeating and diffusing towards the insulating layer and the sheath layer along the twisted binding surface of the cable core conductor, and the longitudinal blocking and swelling function is very tight; even if the power cable enters water due to faults or external reasons, moisture and humidity cannot enter the cable along the cable core conductor, and effective longitudinal water blocking is achieved. And moreover, the sealing grooves are formed in the overlapping sections on the two sides of the armored steel strip, the armored sealing tape is arranged in the oppositely overlapped sealing grooves and is filled in the overlapping section of the armored steel strip, a zero-leakage overlapping structure is formed, so that the wound armored steel strip forms a closed tubular space, the tensile strength and the compressive strength are enhanced, the anti-interference performance of the cable is improved, the extremely high sealing performance is realized, the penetration and the invasion of moisture to the inside of the cable along the radial direction of the cable are completely avoided, and the reliable and tight radial waterproof performance is realized. Still be provided with the identical location plug-in tenon of cross sectional shape and location inserting groove on the overlap joint section of armor steel band, corresponding location plug-in tenon is pegged graft in location inserting groove, and stable winding overlap joint structure of armor steel band has not only been guaranteed to this kind of structure to ensure the reliable mechanical properties and the interference killing feature of cable armor structure, more guaranteed moreover that armor steel band overlap joint section has reliable, stable sealing performance, has good waterproof water-blocking effect. The structure of the utility model also combines the water-blocking belting layer and the nylon sheath layer structure, the water-blocking belting layer forms a multiple waterproof and moistureproof structure, the nylon sheath layer not only enhances the strength and toughness of the cable, but also further improves the waterproof and moistureproof performance of the cable; the waterproof power cable has stable and reliable longitudinal water-blocking and radial waterproof functions, so that the power cable can be used in various complex severe environments for a long time.
The utility model discloses a preferred embodiment, the metal cable core is formed by four fan-shaped conductor transposition, and the fan-shaped angle of each fan-shaped conductor is 90. The good waterproof effect of blocking water is convenient to realize, and the medium-high voltage electric energy transmission is facilitated.
The utility model discloses a further embodiment, the recess that blocks water is the bar recess of isosceles trapezoid cross-section, the tongue that blocks water is the sand grip of semicircle cross-section. The structure has more reliable and stable water resistance performance.
The utility model discloses a preferred embodiment, the cable core sealing tape twines on the metal cable core with the heliciform, and the winding pitch of this cable core sealing tape is less than the transposition pitch of fan-shaped conductor. The ratio of the twisting pitch of the fan-shaped conductor to the winding pitch of the cable core sealing tape is (8-10) to 1. Better longitudinal water blocking can be achieved.
The utility model discloses a preferred embodiment, sealed recess is banding semicircular groove, and this sealed recess is arranged along armor steel band length direction. The positioning insertion groove is a strip-shaped groove with an isosceles trapezoid cross section, the positioning insertion tenon is a strip-shaped tenon with an isosceles trapezoid cross section, and the positioning insertion groove and the positioning insertion tenon are arranged along the length direction of the armored steel belt. The sealing is reliable, the manufacturing and the processing are convenient, and the sealing performance is stable.
The utility model discloses a preferred embodiment, cable core sealing tape is flat rubber sealing tape. The armor sealing tape is a rubber sealing strip with a circular section. The sealing effect is good, and the performance is stable.
In a further embodiment of the present invention, the insulating layer is extruded from cross-linked polyethylene; the water-blocking wrapping tape layer is formed by wrapping a semiconductor water-blocking tape, the overlapping rate of the semi-conductive water-blocking wrapping is 25% -35%, and the nylon sheath is formed by extruding nylon; the outer sheath is formed by extruding and wrapping high-density polyethylene materials.
Drawings
The fully water-blocking power cable of the present invention will be described in further detail with reference to the accompanying drawings and the specific embodiments.
Fig. 1 is a schematic longitudinal sectional structure diagram of one embodiment of the fully water-blocking power cable of the present invention;
FIG. 2 is a schematic cross-sectional structure of the embodiment of FIG. 1;
figure 3 is a schematic cross-sectional view of the metallic cable core of the embodiment of figure 1;
FIG. 4 is an enlarged view of a portion of the structure of section A-A of the structure shown in FIG. 3;
FIG. 5 is a schematic cross-sectional view of the fan-shaped conductor of the embodiment of FIG. 1;
FIG. 6 is a top view of the structure shown in FIG. 5;
FIG. 7 is a left side view of the structure shown in FIG. 5;
FIG. 8 is a schematic cross-sectional view of the armor tape of the embodiment of FIG. 1;
fig. 9 is a schematic partial cross-sectional view of the armor of the embodiment of fig. 1.
In the figure, 1-metal cable core, 11-fan-shaped conductor, 12-water-blocking groove, 13-water-blocking tenon, 14-binding surface, 2-cable core sealing tape, 3-insulating layer, 4-water-blocking tape layer, 5-nylon sheath layer, 6-armor layer, 61-armored steel tape, 62-sealing groove, 63-positioning insertion groove, 64-positioning insertion tenon, 7-outer sheath and 8-armored sealing tape.
Detailed Description
As shown in fig. 1 and 2, the fully water-blocking power cable has a metal cable core 1 formed by twisting 4 copper fan-shaped conductors 11, wherein the fan-shaped central angle of each fan-shaped conductor 11 is 90 °, and an insulating layer 3 formed by extruding crosslinked polyethylene is coated on the periphery of the metal cable core 1. The metal cable core 1 is also wound with a spiral cable core sealing tape 2, the cable core sealing tape 2 is positioned between the insulating layer 3 and the metal cable core 1, and the cable core sealing tape 2 is a rubber sealing tape with a flat section. The winding pitch of the cable core sealing tape 2 is smaller than the twisting pitch of the fan-shaped conductors 11, and the ratio of the twisting pitch of the fan-shaped conductors 11 to the winding pitch of the cable core sealing tape 2 is (8-10): 1, so that the cable has a more reliable longitudinal water-blocking effect.
The insulating layer 3 is coated with a water-blocking belting layer 4, a nylon sheath layer 5, an armor layer 6 and an outer sheath 7 from inside to outside in sequence. The water-blocking wrapping tape layer 4 is formed by wrapping a semi-conductive water-blocking tape, the overlapping rate of the semi-conductive water-blocking wrapping is 30%, and the wrapping overlapping rate is preferably 25% -35%. The nylon sheath 5 is formed by extruding nylon. The outer sheath 7 is extruded from high density polyethylene material.
As shown in fig. 3 and 4, the metal cable core 1 is formed by twisting four fan-shaped conductors 11. The planes on both sides of the sector conductors 11 are binding surfaces 14, and two adjacent sector conductors 11 are bound with each other by the corresponding binding surfaces 14 and twisted into the metal cable core 1.
As shown in fig. 5, 6 and 7, a water blocking groove 12 is formed on a binding surface 14 on one side of the fan-shaped conductor 11, the water blocking groove 12 is a strip-shaped groove, and the cross section of the water blocking groove is an isosceles trapezoid; a water blocking tenon 13 is arranged on a binding surface 14 on the other side of the fan-shaped conductor 11, and the water blocking tenon 13 is a convex strip with a semicircular section. As shown in fig. 4, the convex strip with semicircular section of the water blocking tenon 13 is inserted into the strip-shaped groove with isosceles trapezoid section of the water blocking groove 12, so that the water blocking tenon 13 and the water blocking groove 12 form a joggle structure, thereby blocking the penetration and intrusion of moisture and humidity along the binding surface of the fan-shaped conductor.
As shown in fig. 8 and 9, the armor layer 6 is formed by winding and overlapping sections on both sides of the armor steel tape 61. The material, width and thickness of armor steel tape 61 are common armor steel tape structural style, and its difference all is provided with sealed recess 62 on the overlap joint section of armor steel tape 61 both sides, and the opening direction of the sealed recess 62 of both sides is carried on the back mutually. The sealing grooves 62 are strip-shaped semicircular grooves, and the sealing grooves 62 are arranged on two sides of the steel belt body along the length direction of the armored steel belt 61. Two opposite sealing grooves 62 are formed in opposite directions during winding to form a circular sealing groove, and an armor sealing tape 8 is arranged in the circular sealing groove, wherein the armor sealing tape 8 is a rubber sealing tape with a circular cross section.
The overlapping sections on the two sides of the armor steel strip 61 are also provided with a positioning insertion groove 63 and a positioning insertion tenon 64, the positioning insertion groove 63 and the positioning insertion tenon 64 on the same side are formed by mould pressing, and the cross-sectional shapes of the positioning insertion groove 63 and the positioning insertion tenon 64 are identical. The positioning insertion groove 63 and the positioning insertion tenon 64 in the shape of long strips are arranged on the overlapping sections at two sides of the armored steel strip 61 along the length direction of the steel strip. The positioning plug-in groove 63 and the positioning plug-in tenon 64 on the same side lap joint section are arranged in parallel with the sealing groove 62 on the same side. As shown in fig. 8, the opposing positioning plug groove 63 and positioning plug tongue 64 are both located on the right side of the same side sealing groove 62. When the armor steel strip 61 is wound and lapped, the positioning inserting tenon 64 is rightly inserted into the corresponding positioning inserting groove 63, so that the reliable positioning connection effect of the wound steel strip is realized, and the integral strength of the armor steel strip is enhanced.
Claims (10)
1. The utility model provides a power cable blocks water entirely, includes metal cable core (1), and this metal cable core (1) is formed by a plurality of fan-shaped conductor (11) transposition, and the cladding has insulating layer (3), its characterized in that on metal cable core (1): a spiral cable core sealing tape (2) is wound on the metal cable core (1), and a water-blocking belting layer (4), a nylon sheath layer (5), an armor layer (6) and an outer sheath (7) are sequentially coated on the insulating layer (3) from inside to outside; one binding surface (14) of each fan-shaped conductor (11) is provided with a water-blocking groove (12), the other binding surface (14) of each fan-shaped conductor (11) is provided with a water-blocking tenon (13), and the water-blocking tenons (13) and the water-blocking grooves (12) on the adjacent fan-shaped conductors (11) are mutually joggled; armor steel band (61) are twined and lapped into through the overlap joint section of both sides armor (6), all be provided with sealed recess (62) on the overlap joint section of armor steel band (61) both sides, be provided with armor sealing tape (8) in relative lapped sealed recess (62), still be provided with location inserting groove (63) and location tenon (64) on the overlap joint section of armor steel band (61), the cross sectional shape of this location inserting groove (63) and location tenon (64) is identical, be located location inserting groove (63) and location tenon (64) on homonymy overlap joint section and the mutual parallel arrangement of sealed recess (62) of homonymy overlap joint section, corresponding location inserting tenon (64) are pegged graft in location inserting groove (63).
2. The fully water-blocking power cable of claim 1, wherein: the metal cable core (1) is formed by twisting four fan-shaped conductors (11), and the fan-shaped angle of each fan-shaped conductor (11) is 90 degrees.
3. The fully water-blocking power cable of claim 1, wherein: the water blocking groove (12) is a strip-shaped groove with an isosceles trapezoid cross section, and the water blocking tenon (13) is a convex strip with a semicircular cross section.
4. A fully water-blocking power cable according to claim 1, 2 or 3, characterized in that: the cable core sealing tape (2) is spirally wound on the metal cable core (1), and the winding pitch of the cable core sealing tape (2) is smaller than the stranding pitch of the fan-shaped conductors (11).
5. The fully water-blocking power cable of claim 4, wherein: the ratio of the twisting pitch of the fan-shaped conductor (11) to the winding pitch of the cable core sealing tape (2) is (8-10) to 1.
6. The fully water-blocking power cable of claim 1, wherein: the sealing groove (62) is a strip-shaped semicircular groove, and the sealing groove (62) is arranged along the length direction of the armor steel strip (61).
7. The fully water-blocking power cable according to claim 1 or 6, wherein: the positioning insertion groove (63) is a strip-shaped groove with an isosceles trapezoid cross section, the positioning insertion tenon (64) is a strip-shaped tenon with an isosceles trapezoid cross section, and the positioning insertion groove (63) and the positioning insertion tenon (64) are arranged along the length direction of the armored steel belt (61).
8. The fully water-blocking power cable of claim 1, wherein: the cable core sealing tape (2) is a flat rubber sealing tape.
9. The fully water-blocking power cable of claim 1, wherein: the armor sealing tape (8) is a rubber sealing tape with a circular section.
10. The fully water-blocking power cable of claim 1, wherein: the insulating layer (3) is formed by extruding crosslinked polyethylene; the water-blocking wrapping tape layer (4) is formed by wrapping a semiconductor water-blocking tape, the overlapping rate of the semi-conductive water-blocking wrapping is 25% -35%, and the nylon sheath layer (5) is formed by extruding nylon; the outer sheath (7) is formed by extruding and wrapping high-density polyethylene materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921824842.3U CN210865714U (en) | 2019-10-28 | 2019-10-28 | Full water-blocking power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921824842.3U CN210865714U (en) | 2019-10-28 | 2019-10-28 | Full water-blocking power cable |
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| Publication Number | Publication Date |
|---|---|
| CN210865714U true CN210865714U (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921824842.3U Active CN210865714U (en) | 2019-10-28 | 2019-10-28 | Full water-blocking power cable |
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| CN (1) | CN210865714U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113031179A (en) * | 2021-03-22 | 2021-06-25 | 杭州富通通信技术股份有限公司 | Built-in water-blocking joint and semi-dry optical cable |
-
2019
- 2019-10-28 CN CN201921824842.3U patent/CN210865714U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113031179A (en) * | 2021-03-22 | 2021-06-25 | 杭州富通通信技术股份有限公司 | Built-in water-blocking joint and semi-dry optical cable |
| CN113031179B (en) * | 2021-03-22 | 2022-09-16 | 杭州富通通信技术股份有限公司 | Built-in water-blocking joint and semi-dry optical cable |
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