CN217405157U - 35KV corrugated pipe metal sheath water-blocking cable - Google Patents

Abstract

The utility model relates to the technical field of power cables, in particular to a 35KV corrugated pipe metal sheath water-blocking cable; its conductor is the conductor of the high filling coefficient that is formed by the fashioned wire transposition of a plurality of monofilaments, insulating layer, metallic shield layer, the isolation layer that keeps off the tide, water blocking layer, bellows sheath and plastics sheath have set gradually outward to the conductor, the water blocking layer is including wrapping swelling water blocking structure and indulging a packet swelling water blocking structure around package, the utility model discloses a compound multiple waterproof construction, this kind of structure is laid and is established at outdoor humid environment, can block the entering of moisture completely, and the effectual water blocking performance who improves the product has improved the safe operation coefficient of cable greatly, has improved the life of cable under the adverse conditions, provides better selection for the user.

Description

35KV corrugated pipe metal sheath water-blocking cable

Technical Field

The utility model relates to a power cable technical field especially relates to a 35KV bellows metal sheath cable that blocks water.

Background

In general, when a high-voltage cable is laid outdoors or in a deep well, most of the high-voltage cable is buried in soil or buried in soil after being protected by a pipe, and therefore, the cable is easily subjected to external force directly, and therefore, the cable has a high risk of being damaged externally due to public error. When local damage appears in the cable, inside moisture among the external environment will be followed the damage position and immersed the cable, constantly to the both ends of far away diffusion up to the cable along the inner wall of cable, long-pending long-term the month, moisture will form water tree, electric water tree in the crosslinked polyethylene is insulating, leads to deterioration of cable electrical property, reduces the life of cable.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a 35KV bellows metal sheath cable that blocks water is applicable to the power transmission of 35KV and following circuit, applicable in damp environment, possesses good radial, vertically the function of blocking water, and inside the product can prevent moisture entering cable, keep insulating core dry to the life of extension cable. The product adopts compound multiple waterproof construction, and this kind of structure lays in outdoor humid environment, can block the entering of moisture completely, and the effectual water blocking performance that has improved the product has improved the safe coefficient of operation of cable greatly, has improved the life of cable under the adverse conditions, provides better selection for the user.

The utility model adopts the technical proposal that: the utility model provides a 35KV bellows metal sheath cable that blocks water, includes the conductor, the conductor is the conductor of the high filling coefficient that is formed by the fashioned wire transposition of a plurality of monofilaments, insulating layer, metallic shield layer, moisture barrier layer, water blocking layer, bellows sheath and plastic sheath have set gradually outward to the conductor, the water blocking layer is including wrapping swelling structure that blocks water and indulging package swelling structure that blocks water.

As a preferable technical scheme: the cross section of the conductor is circular, and the conductor comprises a central conductor layer, a first layer of conductor structure and a second layer of conductor structure; the central conductor layer is a single conductor with a regular hexagonal cross section, the first layer of conductor structure is 6 tightly attached regular hexagonal conductors, and the second layer of conductor structure is formed by tightly twisting a plurality of specially-shaped conductors and the first layer of conductor structure. In the scheme, the surface of the conductor is smoother by adopting a formed conductor, the gaps among single wires and conductors are smaller, and the protective layer is more tightly combined with the conductor in the production process of the cable; during the use process of the cable, moist air and water cost are less prone to enter the conductor from two ends of the cable; by adopting the scheme, the filling coefficient of the conductor reaches more than 98 percent, so that the conductor of the cable has good radial and longitudinal water-blocking functions.

As a preferred technical scheme: the insulating layer comprises a cross-linked conductor shield, a cross-linked polyethylene insulator and a cross-linked insulation shield from inside to outside in sequence.

As a preferable technical scheme: the thickness of the wrapping swelling water-blocking structure is 0.2-0.3 mm, the wrapping swelling water-blocking structure is provided with two layers, and the overlapping portion of the wrapping swelling water-blocking structure is not less than 20% of the width of the belt; the thickness of the longitudinal-wrapping swelling water-blocking structure is 3-4 mm, and the overlapping portion of longitudinal wrapping belts of the longitudinal-wrapping swelling water-blocking structure is not less than 10% of the width of the longitudinal wrapping belts. In the scheme, the water-blocking layer is mainly used for preventing water from entering the cable from the cable head end or the damage part of the corrugated pipe sheath, the water-blocking layer is made of a water-absorbing swelling material, and the water-blocking layer is mainly used for blocking the gap in the cable at the moment when the cable is damaged and soaked in water and the swelling material of the water-approaching part of the cable expands; the wrapping swelling water-blocking structure aims at fixing the metal shield; the strip material thickness of indulging package swelling water blocking structure is thicker, is generally 3 ~ 4mm, forms a buffer gear simultaneously between bellows sheath and metallic shield, prevents that direct high temperature damage to the metallic shield from causing in the bellows sheath manufacturing process.

As a preferred technical scheme: the plastic sheath comprises an inner layer sheath and an outer layer sheath, the inner layer sheath is a polyethylene sheath, and the thickness of the inner layer sheath is 2.5 mm. The outer layer sheath is a polyvinyl chloride sheath, a polyolefin sheath or a flame-retardant polyethylene sheath; in the scheme, the inner layer sheath mainly plays a role in preventing moisture from corroding the corrugated pipe sheath through the outer layer sheath; the material of the outer layer sheath is used in the environment of the cable, and can be a polyvinyl chloride sheath, a polyolefin sheath or a flame-retardant polyethylene sheath.

As a preferred technical scheme: the corrugated pipe sheath adopts an aluminum strip welding embossing process, the embossing depth of the corrugated pipe sheath is 5-6% of the diameter of the corrugated pipe sheath, and the embossing pitch of the corrugated pipe sheath is 40% of the diameter of the corrugated pipe sheath. In the scheme, the control of the embossing depth and the embossing pitch is an important factor of the bending radius of the cable, and by adopting the scheme, the bending radius of the cable is 12-15 times smaller than the outer diameter of the cable.

Compared with the prior art, the 35KV corrugated pipe metal sheath water-blocking cable has the following beneficial effects:

1. the utility model discloses a conductor has set gradually insulating layer, metallic shield layer, fender tide isolation layer, water blocking layer, bellows sheath and plastics sheath outward, the utility model discloses a compound multiple waterproof construction, this kind of structure lay in outdoor humid environment, can block the entering of moisture completely, and the effectual water blocking performance who improves the product has improved the safe coefficient of operation of cable greatly, has improved the life of cable under the adverse conditions, provides better selection for the user.

2. The copper conductor of the utility model adopts a conductor forming process, the filling coefficient of the conductor reaches more than 98 percent, so that the conductor of the cable has good radial and longitudinal water blocking functions;

3. the utility model discloses a design of structure that blocks water has contained moisture barrier isolation layer, water blocking layer, bellows sheath and plastics sheath, the plastics sheath has the performance of anti-oxidant protection cable, and simultaneously, the plastics sheath contains inlayer sheath and outer sheath, the inlayer sheath prevents that moisture from seeing through outer sheath erosion bellows sheath. The water-blocking layer is made of a water-absorbing swelling material, and the water-blocking layer has the main function that when the cable is damaged and soaked in water, the swelling material at the water-approaching part of the cable expands to instantly block the inner gap of the cable; simultaneously, the water blocking layer contains around package swelling water blocking structure and indulges package swelling water blocking structure, bilayer structure the water blocking layer has fixed metallic shield and forms a buffer gear between bellows sheath and metallic shield, effectively protects the metallic shield.

Drawings

Fig. 1 is a schematic structural view of a 35KV corrugated pipe metal sheath water-blocking cable of the present invention.

Description of the reference numerals

1-conductor, 11-central conductor layer, 12-first layer conductor structure, 13-second layer conductor structure; 2-insulating layer, 21-cross-linked conductor shield, 22-cross-linked polyethylene insulation, 23-cross-linked insulation shield; 3-metal shielding layer, 4-moisture barrier layer, 5-water-resistant layer, 51-wrapping swelling water-resistant structure and 52-longitudinal wrapping swelling water-resistant structure; 6-corrugated pipe sheath, 7-plastic sheath, 71-inner layer sheath, and 72-outer layer sheath.

Detailed Description

The following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and is not intended to limit the scope of the invention.

As shown in fig. 1, the 35KV corrugated pipe metal sheath water-blocking cable of the embodiment includes a conductor 1, and an insulating layer 2, a metal shielding layer 3, a moisture-blocking isolation layer 4, a water-blocking layer 5, a corrugated pipe sheath 6 and a plastic sheath 7 are sequentially disposed outside the conductor 1;

the conductor 1 is a conductor with high filling coefficient formed by stranding a plurality of single-wire molded wires, the section of the conductor 1 is circular, and the conductor 1 comprises a central conductor layer 11, a first layer conductor structure 12 and a second layer conductor structure 13; the central conductor layer 11 is a single wire with a regular hexagonal cross section, the first layer conductor structure 12 comprises 6 tightly attached regular hexagonal wires, and the regular hexagonal wires of the first layer conductor structure 12 are tightly attached to the regular hexagonal wires of the central conductor layer 11; the second layer conductor structure 13 is formed by tightly attaching a plurality of wires with special-shaped structures to the first layer conductor structure 12, the section of the conductor 1 is circular, the surface of the conductor 1 is smoother, gaps among single wires are smaller, and the filling coefficient of the conductor 1 reaches more than 98%;

the insulating layer 2 comprises a cross-linked conductor shield 11, a cross-linked polyethylene insulator 12 and a cross-linked insulation shield 13 from inside to outside in sequence, the utility model adopts the water tree resistant cross-linked polyethylene YJ-35, which has better inhibiting effect on water and inhibits the formation of water branches;

a moisture barrier layer 4 is arranged outside the metal shield 3, and the moisture barrier layer 4 is preferably made of polyethylene material;

the water-resistant layer 5 is mainly used for preventing water from entering the cable from the damage part of the head end of the cable or the corrugated pipe sheath 6, the water-resistant layer 5 is made of a material capable of absorbing water and swelling, and the main principle of the water-resistant layer 5 is that when the cable is damaged and immersed in water, the swelling material at the water-approaching part of the cable expands to instantly block the gap in the cable; the waterproof layer 5 comprises a wrapping swelling waterproof structure 51 and a longitudinal wrapping swelling waterproof structure 52, the thickness of the wrapping swelling waterproof structure 51 is 0.2-0.3 mm, the wrapping swelling waterproof structure 51 comprises two layers, and the wrapping overlapping part is not less than 20% of the bandwidth; the thickness of the longitudinal swelling water-blocking structure 52 is 3-4 mm, the overlapping part of the longitudinal wrapping tape of the longitudinal swelling water-blocking structure 52 is not less than 10% of the width of the longitudinal wrapping tape, and the metal shield 3 is fixed around the swelling water-blocking structure 51; the thickness of the strip material longitudinally wrapped with the swelling water-blocking structure 52 is thicker, generally 3-4 mm, and the longitudinally wrapped swelling water-blocking structure 52 forms a buffer mechanism between the corrugated pipe sheath 6 and the metal shield 3, so that high-temperature damage to the metal shield 3 in the manufacturing process of the corrugated pipe sheath 6 is prevented.

The corrugated pipe sheath 6 adopts an aluminum strip welding embossing process, the embossing depth of the corrugated pipe sheath 6 is 5-6% of the diameter of the corrugated pipe sheath 6, and the embossing pitch of the corrugated pipe sheath 6 is 40% of the diameter of the corrugated pipe sheath 6. The control of the embossing depth and the embossing pitch is an important factor for the size of the bending radius of the cable, and by adopting the scheme, the bending radius of the cable is less than 15 times of the outer diameter of the cable.

A plastic sheath 7 is arranged outside the corrugated pipe sheath 6, the plastic sheath 7 comprises an inner layer sheath 71 and an outer layer sheath 72, the inner layer sheath 71 is a polyethylene sheath, and the thickness of the inner layer sheath 71 is 2.5 mm; the outer sheath 72 is used in the environment of the cable, and can be a polyvinyl chloride sheath, a polyolefin sheath or a flame-retardant polyethylene sheath; in this arrangement, the inner jacket 71 serves primarily to prevent moisture from eroding the bellows jacket 6 through the outer jacket 72.

The utility model discloses a compound multiple waterproof construction, this kind of structure lay in outdoor humid environment, can block the entering of moisture completely, the effectual water blocking performance who improves the product has improved the safe running coefficient of cable greatly, has improved the life of cable under the adverse conditions, provides better selection for the user.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (7)

1. The utility model provides a 35KV bellows metal sheath cable that blocks water, includes the conductor, its characterized in that: the conductor is the conductor of the high filling coefficient that is formed by the fashioned wire transposition of a plurality of monofilaments, insulating layer, metallic shield layer, the isolation layer that keeps off the tide, water blocking layer, bellows sheath and plastics sheath have set gradually outward to the conductor, the water blocking layer is including wrapping the swelling structure of blocking water and indulging the swelling structure of blocking water of package.

2. The 35KV corrugated pipe metal sheath water-blocking cable as claimed in claim 1, wherein: the cross section of the conductor is circular, and the conductor comprises a central conductor layer, a first layer of conductor structure and a second layer of conductor structure; the central conductor layer is a single conductor with a regular hexagonal cross section, the first layer of conductor structure is 6 tightly attached regular hexagonal conductors, and the second layer of conductor structure is formed by tightly twisting a plurality of specially-shaped conductors and the first layer of conductor structure.

3. The 35KV corrugated tube metal sheath water-blocking cable of claim 1, wherein: the insulating layer comprises a cross-linked conductor shield, a cross-linked polyethylene insulator and a cross-linked insulation shield from inside to outside in sequence.

4. The 35KV corrugated tube metal sheath water-blocking cable of claim 1, wherein: the thickness of the wrapping swelling water-blocking structure is 0.2-0.3 mm, the wrapping swelling water-blocking structure is provided with two layers, and the overlapping portion of the wrapping swelling water-blocking structure is not less than 20% of the width of the belt; the thickness of the longitudinal-wrapping swelling water-blocking structure is 3-4 mm, and the overlapping portion of longitudinal wrapping belts of the longitudinal-wrapping swelling water-blocking structure is not less than 10% of the width of the longitudinal wrapping belts.

5. The 35KV corrugated tube metal sheath water-blocking cable of claim 1, wherein: the plastic sheath comprises an inner layer sheath and an outer layer sheath, the inner layer sheath is a polyethylene sheath, and the thickness of the inner layer sheath is 2.5 mm.

6. The 35KV corrugated tube metal sheath water-blocking cable of claim 5, wherein: the outer layer sheath is a polyvinyl chloride sheath, a polyolefin sheath or a flame-retardant polyethylene sheath.

7. The 35KV corrugated tube metal sheath water-blocking cable of claim 1, wherein: the corrugated pipe sheath adopts an aluminum strip welding embossing process, the embossing depth of the corrugated pipe sheath is 5-6% of the diameter of the corrugated pipe sheath, and the embossing pitch of the corrugated pipe sheath is 40% of the diameter of the corrugated pipe sheath.

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