CN207367668U - The full water repellent electric cable of cross linked insulation is pressed in one kind - Google Patents

Abstract

The full water repellent electric cable of cross linked insulation is pressed in one kind, it is made of shielding core and clad, clad cladding shielding core；Shielding core is coated formed successively by conductor wire core, conductor shield, cross linked insulation layer, insulation screen, semiconductor waterstop and metal screen layer from-inner-to-outer；The first water blocking layer is filled in conductor wire core；First water blocking layer is made of water blocking yarn and water-proofing powder, insulation screen outer layer surface attachment water-proofing powder.Possess more preferable waterproof ability, while reduce cable size, simple in structure, saving cost easy to process；Contacted between each layer, thermal diffusivity is good, safe；Service life is grown；It is stronger to shield short circuit current flow ability.

Description

The full water repellent electric cable of cross linked insulation is pressed in one kind

Technical field

The utility model belongs to field of cables, more particularly to a kind of water repellent electric cable.

Background technology

Crosslinked polyetylene insulated medium-pressure power cable showed in terms of electrical property and hot property it is very excellent, but cable transport If internal during row soak or be chronically under wet environment, water tree can be produced inside insulating layer, at this time crosslinked polyetylene insulated electricity The meeting accelerated ageing of power cable insulation, decreasing insulating, the medium-pressure power cable of more than 25 years script projected life will taper to 10 years even shorter.

In more complicated environment, such as the vertical shaft of easy ponding, cable duct requires midium voltage cable when engineering project is laid with Must possess water resistance.General middle pressure water-resistant power cable is by water-blocking conductor, internal shield, insulating layer, external shielding layer, and half 9 Rotating fields such as conductive water blocking layer, metal screen layer, semiconductive water blocking layer, radial direction moisture-proof layer, outer jacket form.Such a electricity that blocks water Power cable employs water-proofing powder, water blocking yarn, waterstop, and waterproofing rope is mutually combined to form longitudinal water-blocking layer, above-mentioned several materials that block water Material active water swelling and produces pasty masses not soluble in water after meeting water, to prevent longitudinal flow of the moisture content along cable, thus Play the role of longitudinal water-blocking.

But the water repellent electric cable structure is complex, in process of production, 6 or 7 procedures need to be divided to be produced, it is right Each operation quality control requirement is higher, and technique is larger.Since material water-proof material initiative water swelling ability is stronger, all Once occur procedure connection interval length in more processes or production base is in the situation of humidity ratio larger area, can easily make The cable core produced makes moist and causes material water-proof material to absorb the moisture content or moisture penetrated into, makes the volume of its own swollen rapidly It is swollen, it may cause to have produced core and scrap or do over again.

Simultaneously as material water-proof material is expensive, and water repellent electric cable is complicated, thus cause material water-proof material expend compared with More, process is numerous and diverse, makes that the production cost increases, and in addition the water-resistant power cable outside diameter of such a structure is larger, construction party mounting and installation Cost increase therewith.

Utility model content

To solve the above-mentioned problems, the utility model adopts the following technical solution：

The full water repellent electric cable of cross linked insulation is pressed in one kind, it is made of shielding core and clad, clad cladding shielding line Core；Core is shielded by conductor wire core, conductor shield, cross linked insulation layer, insulation screen, semiconductor waterstop and metallic shield Layer from-inner-to-outer coats successively to be formed；The first water blocking layer is filled in conductor wire core；First water blocking layer is by water blocking yarn and water-proofing powder group Into insulation screen outer layer surface attachment water-proofing powder, insulation screen outer layer surface is flute profile.

Preferably, conductor wire core is made of multiple conducting wires, and the first water blocking layer is filled between each conducting wire.

Preferably, it is one or more to shield core.

Preferably, when shielding core is one, clad is outer jacket, and outer jacket cladding shields core.

Preferably, when shielding core is more, clad from-inner-to-outer is by waterproofing rope, waterstop and outer jacket composition.

Preferably, the waterstop coats the shielding core, and the waterproofing rope is radially filled in the waterstop and screen Cover between core in gap, the outer jacket is coated on waterstop outer layer.

Preferably, outer jacket is made of MDPE or HDPE material.

Preferably, metal screen layer is single side aluminium-plastic tape.

The beneficial effects of the utility model are：1. cable size is reduced, it is simple in structure, while manufacturing procedure is reduced, It is easy to process, save cost；2. being contacted between each layer, thermal diffusivity is good, safe；3. service life is grown, use cost is low； 4. blocking water at many levels, water-resisting ability is strong.

Brief description of the drawings

Fig. 1 is sectional view of the utility model using single shielding core structure；

Fig. 2 is sectional view of the utility model using more shielding core structures；

Fig. 3 is insulation screen sectional view.

In figure：1 conductor wire core, 2 first water blocking layers, 3 conductor shields, 4 cross linked insulation layers, 5 insulation screens, 6 half lead Electric waterstop, 7 metal screen layers, 8 outer jackets, 9 waterproofing ropes, 10 waterstops.

Embodiment

The utility model is further described below in conjunction with the accompanying drawings：

Such as Fig. 1, shown in 2, shielding core is by conductor wire core 1, conductor shield 3, cross linked insulation layer 4, insulation screen 5, Semiconductor waterstop 6 and metal screen layer 7 become shielding line core from interior for outer coat successively.1 outer cladding conductor of conductor wire core Shielded layer 3, conductor wire core 1 is interior to be formed for multiple conducting wires, and the first water blocking layer 2 is filled between conducting wire and conductor shield 3 Gap, the first water blocking layer 2 are made of water blocking yarn and water-proofing powder, 5 outer layer surface of insulation screen attachment water-proofing powder.

Coating conductor shielded layer can reduce the diameter of cable entirety behind space between first water blocking layer 2 filling conducting wire. Metal screen layer 7 uses single side aluminium-plastic tape.

Cross linked insulation layer 4 uses cross-linking polyethylene materials, plays the role of insulation.

As shown in figure 3,5 outer layer of insulation screen is direct tooth type, its outer surface is dispersed with uniform groove so that water-proofing powder It is easier to be attached on the outer layer of insulation screen 5.After water-proofing powder adheres to, then one layer of semiconductor waterstop 6 is coated, can made It is more firm to obtain water-proofing powder attachment.On the other hand, the insulation screen 5 of equidistant straight-tooth shape can keep semiconductor waterstop 6, gold Belong to good contact between shielded layer 7 and insulation screen 5, avoid cable and shelf depreciation occurs, ensure the safety of cable system Property.

When the shielding core of cable is single, directly in shielding core outer cladding outer jacket 8.When the shielding core of cable For more when, first it is each shielding core between fill waterproofing rope 9, and waterproofing rope 9 and shielding core arrange in the same direction, then outside Layer coats waterstop 10 and outer jacket 8 successively.

Outer jacket 8 uses MDPE or HDPE material, can possess more preferable wear-resisting property, further increase blocking water for cable Ability.

Semiconductor waterstop, water blocking yarn, waterproofing rope are longitudinal water-blockings；Aluminium-plastic tape, MDPE or HDPE are radial water-resistings.

The conductor wire core 1 that the utility model is blocked water using copper conductor or aluminum conductor, water blocking yarn and water-proofing powder composition；Using this Kind of combination the reason is that：If all it can increase conductor diameter and easily block water using water blocking yarn between conductor monofilament Phenomena such as yarn jumps stock, and conductive surface is rough；When all using water-proofing powder, there are larger sky between conductor single line and stranded layer Gap, attached powder are difficult.Therefore water blocking yarn is used, water-proofing powder combination, is not increased, conductor longitudinal water-blocking effect with reaching outside diameter.

The utility model uses single side aluminium-plastic tape, and single side aluminium-plastic tape plays shielding in the utility model, radially hinders Water double action.For general water-resistant power cable, shielded layer uses copper strip shielding, by taking 12/20kV water-resistant power cables as an example, 95mm²~800mm²Water-resistant power cable, the single side aluminium-plastic tape of general water-resistant power cable copper strip shielding and the utility model It is as shown in table 1 to shield short circuit current flow correction data,

Table 1

It can thus be seen that single side aluminium-plastic tape, can when short circuit occurs for system in 20kV midium voltage cables described herein Also play the role of metallic shield as nonmagnetic substance instead of passage of the copper strips as short circuit current flow, aluminium-plastic tape sheet completely.

In addition, single side aluminium-plastic tape is made of aluminium strip and plastic film, in production, in a manner of longitudinal wrap and spray gun is used Molten plastic layer closely makes cable radially totally-enclosed to bond, to play the role of radial water-resisting.Such a aluminium for possessing double action Plastic composite strip longitudinal wrap layer, not only instead of copper strip shielding layer and reaches same shield effectiveness, longitudinal wrap aluminium-plastic tape is extruded outer at the same time Sheath, and without installation copper strip shielding layer and subsequent process, can be exposed to the open air to avoid conductor wire core 1 before cladding metal screen layer 7 The long time contacts moisture and expands in atmosphere, improves the reliability of water repellent electric cable, reduces production, the cost of raw material.

It these are only the preferred embodiment of the utility model, but the design concept of the present invention is not limited thereto, it is all The insubstantial modifications made using this design to the utility model, are also each fallen within the scope of protection of the utility model.

Claims (8)

1. the full water repellent electric cable of cross linked insulation is pressed in one kind, it is characterised in that：It is made of shielding core and clad, the cladding Layer coats the shielding core；The shielding core is by conductor wire core（1）, conductor shield（3）, cross linked insulation layer（4）, insulation Shielded layer（5）, semiconductor waterstop（6）And metal screen layer（7）From-inner-to-outer coats form successively；The conductor wire core（1） The first water blocking layer of middle filling（2）；First water blocking layer（2）It is made of water blocking yarn and water-proofing powder, the insulation screen（5）Outside Aspect adheres to water-proofing powder, the insulation screen（5）Outer layer surface is flute profile.

2. press the full water repellent electric cable of cross linked insulation in one kind according to claim 1, it is characterised in that：The conductor wire core （1）It is made of multiple conducting wires, first water blocking layer（2）It is arranged between each conducting wire.

3. press the full water repellent electric cable of cross linked insulation in one kind according to claim 1, it is characterised in that：It is described shielding core be One or more.

4. press the full water repellent electric cable of cross linked insulation in one kind according to claim 3, it is characterised in that：It is described shielding core be An at piece, the clad is outer jacket（8）, the outer jacket（8）Coat the shielding core.

5. press the full water repellent electric cable of cross linked insulation in one kind according to claim 3, it is characterised in that：It is described shielding core be At more, the clad from-inner-to-outer is by waterproofing rope（9）, waterstop（10）And outer jacket（8）Composition.

6. press the full water repellent electric cable of cross linked insulation in one kind according to claim 5, it is characterised in that：The waterstop（10） Coat the shielding core, the waterproofing rope（9）Radially fill in the waterstop（10）Between shielding core in gap, institute State outer jacket（8）It is coated on waterstop（10）Outer layer.

7. press the full water repellent electric cable of cross linked insulation in one kind according to claim 4 or 5, it is characterised in that：Outer jacket（8）For MDPE or HDPE material are made.

8. press the full water repellent electric cable of cross linked insulation in one kind according to claim 1, it is characterised in that：The metal screen layer （7）For single side aluminium-plastic tape.