CN201374218Y

CN201374218Y - Bearing intertwist type power cable

Info

Publication number: CN201374218Y
Application number: CN200920037444U
Authority: CN
Inventors: 陈晓军; 夏亚芳; 吴丽芳; 卫星
Original assignee: Wuxi Jiangnan Cable Co Ltd
Current assignee: Wuxi Jiangnan Cable Co Ltd
Priority date: 2009-02-13
Filing date: 2009-02-13
Publication date: 2009-12-30
Anticipated expiration: 2019-02-13

Abstract

The utility model discloses a bearing intertwist type power cable which comprises a supporting wire core arranged in the middle and three single cores which are intertwisted along the supporting wire core. The supporting wire core adopts a steel strand or an aluminum alloy strand with higher strength, and has high tensile force, so a cable core of the cable is ensured to not be forced in an installing and laying process, the injury effect to a conductive wire core is reduced, and the running safety of a line is enhanced. The cable is formed by three single cores, the nodal diameter of a finished cable is 50 times of an ordinary cable, every two wire cores are not tightly arranged against with each other and are easy to be separated, and manufacture of a branch joint is convenient.

Description

Carry stranded type power cable

Technical field

The utility model relates to a kind of cable, specifically is the stranded type power cable of a kind of carrying.

Background technology

Along with the high speed development of national economy, the power cable demand is increasing, and the big city adopts the raising of dual-ring network power supply and area, city center underground cable rate will improve the power cable use amount greatly.At present, power cable mostly adopts three-core cable, when installation is laid, generally all be that whole cable drawn, even consider to adopt steel wire that cable core is protected, still can be drawn to the conductor of cable, the tractive effort of general design is no more than 30% of conductor total cross section pull-off force, ideally this, the core of cable there are not much influences; But in the actual installation laid processes; Tractive effort is constantly to change, and particularly starts moment just, and tractive effort is very big, and this just might cause damage to core.Simultaneously, power cable all are manufacturings of carrying out sheath behind three core strandings again, the stranding lay ratio is generally at 30 times, in use, stranded tight between the cable core, be difficult to separately, when constructing at the scene, be difficult to process all kinds of joints when particularly needing branch to connect.

The utility model content

Technical problem to be solved in the utility model provides a kind of safe and reliable, has the stranded type power cable of carrying of high pull-off force, and this cable lay ratio is generally at 50 times, and is easy to separately conveniently carry out the making of branch joint.

The stranded type power cable of carrying described in the utility model, three stranded single cores of core are supported on support core in the middle of comprising and edge, steel strand wire or aluminium alloy stranded conductor in the middle of described support core comprises, skin extrudes polyethylene layer.

Single cored structure described in the utility model, can be single core low-voltage cable or single core midium voltage cable, can be ordinary construction, stop water, fireproof construction or other structures, other of conductor or single core each layer arbitrarily can be any materials known in the art, and these are all same as the prior art.

Single cored structure described in the utility model, a kind of better is to adopt stop water: strand system water blocking yarn between the layer of middle strand system conductor and the layer, the wrapped semiconductive single face of strand guidance volume surrounding waterstop, three-layer co-extruded again conductor shield, insulating barrier and insulation screen outside waterstop, inferior skin is dredged around reaching the wrapped composition metal screen of forming in copper strips gap by copper cash, extrudes polyethylene layer behind the wrapped again waterstop of outermost layer.

In the utility model, supporting core adopts the steel strand wire or the aluminium alloy stranded conductor of higher-strength to make, possesses very high pull-off force, thereby the core of guaranteeing cable in laid processes is installed does not stress, avoided traditional cable and may cause damage to conductor thread core because tractive effort is excessive, reduced injury effect, improved the safety in operation of circuit conductor wire core.The product cable is made up of three single cores, and the stranding lay ratio is generally at 50 times, and core and core are not closely to be close together, and is easy to separately conveniently carry out the making of branch joint.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the structural representation that the utility model list core blocks water.

Embodiment

As shown in Figure 1, single core coil buckling type medium-pressure power cable described in the utility model has adopted a kind of structure of novelty, the construction of cable changes three single cores 1 into by three original cores and carries out coil buckling, add special support core simultaneously, supporting core middle is steel strand wire or aluminium alloy stranded conductor 2, and skin extrudes polyethylene layer 13.

As shown in Figure 2; the core structure is: adopt the strand system conductor 3 that presses; strand system water blocking yarn 4 between the layer of strand system conductor 3 and the layer; the wrapped semiconductive single face of strand guidance volume surrounding waterstop 5; in order to protect core better, also wrapped nonwoven fabrics outside waterstop 5 (when crossing crosslinked machine, it being peeled off by hand).And then three-layer co-extruded conductor shield 6, insulation 7, insulation shielding 8, afterwards again by copper cash dredge around 9 and copper strips gap wrapped 10 form the composition metal screen, extrude black medium density polyethylene 12 behind the wrapped more at last waterstop 11.This structure can play integrated water stop effect preferably.

Compact conductor makes moisture infiltrate the difficulty that conductor becomes, the water blocking yarn water-swellable plays good vertical waterproof action, and the outer wrapped semiconductive single face waterstop of core plays radially waterproof effect, the outer wrapped waterstop of metallic shield can make the metallic shield structure more firm, more makes the effect that radially blocks water of having played, by these several measures, prevent the intrusion of moisture effectively, stoped cable insulation to produce the water tree, improved the security reliability of cable operation.

The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.

Claims

1, the stranded type power cable of a kind of carrying, the stranded three single cores (1) of core are supported on support core and edge in the middle of it is characterized in that comprising.

2, the stranded type power cable of carrying according to claim 1 is characterized in that: the steel strand wire (2) in the middle of described support core comprises, skin extrudes polyethylene layer (13).

3, the stranded type power cable of carrying according to claim 1 is characterized in that: the aluminium alloy stranded conductor (2) in the middle of described support core comprises, skin extrudes polyethylene layer (3).

4, according to claim 1, the stranded type power cable of 2 or 3 described carryings, it is characterized in that described single cored structure is: strand system water blocking yarn (4) between the layer of middle strand system conductor (3) and the layer, strand system conductor (3) outer wrapped semiconductive single face waterstops (5), three-layer co-extruded again conductor shield (6), insulating barrier (7) and insulation screen (8) outside waterstop (5), inferior skin is dredged by copper cash and is formed the composition metal screen around (9) and copper strips gap wrapped (10), extrudes polyethylene layer (12) behind the wrapped again waterstop of outermost layer (11).