CN212967198U

CN212967198U - Special cable for frequency converter

Info

Publication number: CN212967198U
Application number: CN202022392973.8U
Authority: CN
Inventors: 孙惠民; 施生
Original assignee: Shanghai Yinjian Special Cable Co ltd
Current assignee: Shanghai Yinjian Special Cable Co ltd
Priority date: 2020-10-24
Filing date: 2020-10-24
Publication date: 2021-04-13
Anticipated expiration: 2030-10-24

Abstract

The utility model relates to a converter private cable, including the cable core, the cable core includes three wires and three zero lines, the cable core outward in proper order the cladding have first shielding layer and outer jacket, be provided with the filling layer between first shielding layer and the cable core, be provided with along cable length direction in the filling layer and be used for with three wire detached first cable framework, first cable framework falls into three first separation storehouse with first shielding layer inner space, three wires are located three first separation storehouse respectively, it is used for with wire and zero line detached second cable framework to extend on the first cable framework, form three second separation storehouse between second cable framework and the first shielding layer, three zero lines are located three second separation storehouse respectively. This application separates every wire and zero line through setting up first cable framework and second cable framework, can improve the condition that the wire in the cable twines easily together, has promoted the factor of safety of cable.

Description

Special cable for frequency converter

Technical Field

The application relates to the field of cables, in particular to a special cable for a frequency converter.

Background

Because the frequency converter has excellent speed regulation performance and obvious electricity-saving effect, the operation condition of the existing equipment can be improved, and the safety reliability and the equipment utilization rate of the system are improved, the frequency conversion speed regulation technology is more and more widely applied to motor transmission equipment, such as various industries of electric power, metallurgy, petroleum, chemical industry, paper making, food, textile and the like. With the continuous expansion of the application field, the requirements on the cable for providing a power supply for the frequency converter are also continuously improved.

At present, all universal cables adopt a six-core structure, namely, three leads and three zero lines are contained in one sheath, so that although general requirements of a frequency converter can be met, in the actual use process of the cable, the three leads are easy to twist and intertwine, the insulating sheath of the lead is easy to wear and crack, and even danger occurs.

SUMMERY OF THE UTILITY MODEL

In order to improve the condition that wires in the cable are easy to be intertwined, the application provides a special cable for a frequency converter.

The application provides a special cable for a frequency converter adopts following technical scheme:

the utility model provides a converter private cable, includes the cable core, the cable core includes three wires and three zero lines, the cable core outward in proper order the cladding have first shielding layer and outer jacket, be provided with the filling layer between first shielding layer and the cable core, be provided with along cable length direction in the filling layer and be used for the first cable skeleton divided with three wires, first cable skeleton falls into three first separation storehouse, three with first shielding layer inner space the wire is located three first separation storehouse respectively.

Through adopting above-mentioned technical scheme, first cable framework separates three wires, and the cable is in transportation, laying, use, is difficult to intertwine together on the one hand, and then has improved the insulating skin wearing and tearing of wire, the dangerous condition even takes place for the fracture, and on the other hand sets up first cable framework and has still played certain supporting role to cable inside, has strengthened the intensity of cable.

Optionally, a second cable framework for separating the conducting wire and the zero line is arranged on the first cable framework in an extending mode, three second isolation bins are formed between the second cable framework and the first shielding layer, and the three zero lines are located in the three second isolation bins respectively.

Through adopting above-mentioned technical scheme, set up second cable framework, can separate zero line and wire, improved the condition that zero line and wire intertwine together, wear and tear each other, further promoted the factor of safety of cable, simultaneously, set up the intensity that second cable framework has further strengthened the cable.

Optionally, a first reinforcing layer for preventing the cable framework from damaging the first shielding layer is arranged between the first shielding layer and the filling layer.

Through adopting above-mentioned technical scheme, the cable is in transportation, laying process, and first enhancement layer has played certain guard action to first shielding layer, has improved the condition of cable skeleton wearing and tearing, lacerate first shielding layer, has promoted the life of cable.

Optionally, one side of the cable framework, which is away from the axis of the cable, extends to form a plurality of protruding portions, and the protruding portions are embedded in the first reinforcing layer.

Through adopting above-mentioned technical scheme, the bellying card is established in first enhancement layer, and then makes the whole card of cable skeleton establish in first enhancement layer, has improved the transportation and the laying process of cable, and the relative condition of rotating, misplacing takes place for cable skeleton and first enhancement layer.

Optionally, the wire sequentially includes a conductor, a second shielding layer, and an insulating layer from inside to outside.

Through adopting above-mentioned technical scheme, the second shielding layer sets up between conductor and insulating layer, can fill the air gap between conductor and the insulating layer to form the equipotential with the conductor, thereby avoided taking place partial discharge's the condition between conductor and the insulating layer, promoted the factor of safety of cable.

Optionally, the outer protective layer is made of a cross-linked polyethylene insulating material.

By adopting the technical scheme, the condition that insulation breakdown is caused by the staggered action of electric and thermal factors after the cable is corroded by various severe factors in the operation process is improved.

Optionally, a second reinforcing layer is disposed between the first shielding layer and the outer sheath.

Through adopting above-mentioned technical scheme, set up the second enhancement layer and further promoted the bulk strength of cable.

Optionally, a plurality of tensile fiber bundles are arranged in the second reinforcing layer along the length direction of the cable.

Through adopting above-mentioned technical scheme, the tensile strength of cable is promoted in setting up of tensile tow, has improved the condition that the cable takes place axial fracture under the exogenic action.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the first cable framework and the second cable framework, the three leads and the three zero lines can be effectively separated, and the conditions that the leads and the zero lines are intertwined together and the insulating skins of the leads are abraded and cracked are improved;

2. by arranging the first reinforcing layer and the second reinforcing layer, on one hand, the overall strength of the cable is enhanced, and on the other hand, a first shielding layer between the first reinforcing layer and the second reinforcing layer plays a certain role in protection;

3. through setting up the bellying on the cable skeleton, the cable skeleton passes through the bellying card to be established in first enhancement layer, has improved the transportation of cable and has laid the in-process, the condition that relative rotation, dislocation take place for cable skeleton and first enhancement layer.

Drawings

Fig. 1 is an axial sectional view showing an internal structure in an embodiment of the present application.

Description of reference numerals: 1. a cable core; 11. a wire; 111. a conductor; 112. a second shielding layer; 113. an insulating layer; 12. a zero line; 2. a filling layer; 3. a first reinforcing layer; 4. a first shielding layer; 5. a second reinforcing layer; 51. a tensile fiber bundle; 6. an outer jacket; 7. a cable framework; 71. a first cable framework; 72. a second cable framework; 721. a raised portion.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a special cable for a frequency converter. Referring to fig. 1, the special cable for the frequency converter sequentially comprises a cable core 1, a filling layer 2, a first reinforcing layer 3, a first shielding layer 4, a second reinforcing layer 5 and an outer protective layer 6 from inside to outside, wherein a cable framework 7 for separating the cable core 1 is arranged in the filling layer 2.

The cable core 1 is embedded in the filling layer 2 along the length direction of the cable, the cable core 1 comprises three wires 11 and three zero lines 12, the three wires 11 are distributed in a circumferential array by taking the axis of the cable as the axis, the three zero lines 12 are also distributed in a circumferential array by taking the axis of the cable as the axis, and a 3+3 core symmetrical structure is integrally formed.

The lead 11 sequentially comprises a conductor 111, a second shielding layer 112 woven by copper wires and a cross-linked polyethylene insulating layer 113 from inside to outside, the second shielding layer 112 is arranged between the conductor 111 and the insulating layer 113, can fill an air gap between the conductor 111 and the insulating layer 113, and forms an equipotential with the conductor 111, so that the situation of partial discharge between the conductor 111 and the insulating layer 113 is avoided, and the safety coefficient of the cable is improved.

The filling layer 2 is the filling layer 2 that the polyurethane material made, and the cladding of filling layer 2 can play certain guard action to cable core 1 outside 1 cable core.

In the process of cable transportation and laying, the three wires 11 are easy to twist and intertwine together, which easily causes abrasion and cracking of the insulation skin of the wires 11, even causes danger, so the cable framework 7 is arranged in the filling layer 2 along the length direction of the cable, the cable framework 7 comprises a first cable framework 71 and a second cable framework 72, the first cable framework 71 is three PVC partition plates formed by extending outwards from the center of the cable, one end of each PVC partition plate departing from the center of the cable continues to extend outwards to form two support plates which form six support plates and form a second cable framework 72, the first cable framework 71 divides the inner space of the first reinforcing layer 3 into three first isolation bins, the three wires 11 are respectively positioned in the three first isolation bins, three second isolation bins are formed between the second cable framework 72 and the first reinforcing layer 3, the three zero lines 12 are respectively positioned in the three second isolation bins, through setting up cable skeleton 7, can effectively separate three wire 11 and three zero line 12, improved wire 11, zero line 12 intertwine together, the condition of 11 insulating skin wearing and tearing of wire, fracture.

First enhancement layer 3 is first enhancement layer 3 that rubber made, can play certain guard action to first shielding layer 4, prevent the wearing and tearing of cable skeleton 7, rip first shielding layer 4, simultaneously, second cable skeleton 72 deviates from the one end at cable center and continues to extend to first enhancement layer 3 in and form six bellyings 721, bellyings 721 inlays to be established in first enhancement layer 3, improved the transportation at the cable and laid the in-process, relative rotation takes place for cable skeleton 7 and first enhancement layer 3, the condition of dislocation.

The first shielding layer 4 is woven by copper wires, so that the electromagnetic wave emission is inhibited, the first shielding layer can be used as a short-circuit current channel, and a certain protection effect can be achieved.

The second reinforcing layer 5 is formed by weaving semiconductor 111 fiber yarns, the overall strength of the cable can be improved, meanwhile, in order to further improve the tensile strength of the cable, a plurality of tensile fiber bundles 51 are arranged in the second reinforcing layer 5 along the length direction of the cable, and the tensile fiber bundles 51 are distributed in a circumferential array mode by taking the axis of the cable as the axis, so that the condition that the cable is axially broken under the action of external force is improved.

Considering the influence of high-frequency pulse voltage on the outer protective layer 6, the outer protective layer 6 is made of the cross-linked polyethylene insulating material, and the condition that insulation breakdown is caused by the staggered action of electrical and thermal factors after the cable is corroded by various severe factors in the operation process is improved.

The implementation principle of the cable special for the frequency converter in the embodiment of the application is as follows:

the cable framework 7 can effectively separate the three leads 11 and the three zero lines 12, and the conditions that the leads 11 and the zero lines 12 are intertwined together and the insulating skins of the leads 11 are abraded and cracked are improved; by arranging the first reinforcing layer 3 and the second reinforcing layer 5, on one hand, the overall strength of the cable is enhanced, and on the other hand, the first shielding layer 4 between the first reinforcing layer 3 and the second reinforcing layer 5 is protected to a certain extent.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a converter private cable, includes cable core (1), cable core (1) includes three wire (11) and three zero line (12), the cladding is provided with first shielding layer (4) and outer jacket (6), its characterized in that outward in proper order in cable core (1): be provided with filling layer (2) between first shielding layer (4) and cable core (1), be provided with along cable length direction in filling layer (2) and be used for three wire (11) divided first cable skeleton (71), first cable skeleton (71) divide into three first separation storehouse, three with first shielding layer (4) inner space wire (11) are located three first separation storehouse respectively.

2. The special cable for the frequency converter according to claim 1, wherein: a second cable framework (72) used for separating the lead (11) and the zero line (12) is arranged on the first cable framework (71) in an extending mode, three second isolation bins are formed between the second cable framework (72) and the first shielding layer (4), and the three zero lines (12) are located in the three second isolation bins respectively.

3. The cable special for the frequency converter according to claim 2, wherein: a first reinforcing layer (3) used for preventing the cable framework (7) from damaging the first shielding layer (4) is arranged between the first shielding layer (4) and the filling layer (2).

4. A cable dedicated to a frequency converter according to claim 3, characterized in that: one side of the cable framework (7) departing from the axis of the cable extends to form a plurality of protrusions (721), and the protrusions (721) are embedded in the first reinforcing layer (3).

5. The special cable for the frequency converter according to claim 1, wherein: the lead (11) sequentially comprises a conductor (111), a second shielding layer (112) and an insulating layer (113) from inside to outside.

6. The special cable for the frequency converter according to claim 1, wherein: the outer protective layer (6) is made of cross-linked polyethylene insulating materials (6).

7. The special cable for the frequency converter according to claim 1, wherein: and a second reinforcing layer (5) is arranged between the first shielding layer (4) and the outer protective layer (6).

8. The cable special for the frequency converter according to claim 7, wherein: and a plurality of tensile fiber bundles (51) are arranged in the second reinforcing layer (5) along the length direction of the cable.