CN210429344U - Special long stator cable for magnetic suspension - Google Patents
Special long stator cable for magnetic suspension Download PDFInfo
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- CN210429344U CN210429344U CN201921504358.2U CN201921504358U CN210429344U CN 210429344 U CN210429344 U CN 210429344U CN 201921504358 U CN201921504358 U CN 201921504358U CN 210429344 U CN210429344 U CN 210429344U
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Abstract
The utility model discloses a special long stator cable of magnetic suspension. The cable comprises a conductor positioned in the center, and a conductor shielding layer, an insulating shielding layer, a sheath and a coating are sequentially extruded outside the conductor; the resistivity of the insulating shielding layer is greater than that of the sheath, and the resistivity of the sheath is greater than that of the coating; the conductor comprises a central line, and an annular conductor layer is arranged outside the central line; in the multiple layers of annular conductor layers, the innermost annular conductor layer arranged close to the central line is composed of a plurality of single-core conductors with trapezoidal sections, and the left side and the right side of each single-core conductor are close to the adjacent single-core conductors; in the other annular conductor layers, each annular conductor layer is formed by twisting a plurality of Z-shaped type line single wires or a plurality of S-shaped type line single wires. The utility model discloses a closely knit degree of conductor of cable is high, and it is little to lay bending radius, and the security is high.
Description
Technical Field
The utility model relates to a special long stator cable of magnetic suspension belongs to the cable field.
Background
The conductors designed by the existing magnetic suspension long stator winding cable have three types:
1. the middle core wire is formed by twisting fan-shaped aluminum wires, and the outer layer is formed by twisting aluminum wires.
2. The middle core wire is formed by stranding 7 round aluminum wires, and the outer layer is formed by stranding aluminum type wires.
3. The middle core wire is formed by twisting fan-shaped aluminum molded wires, and the outer layer is formed by twisting trapezoidal molded wires.
The french nixon cable and shanghai cable research adopted 1 st and 2 nd structures, and the far east cable limited company adopted 3 rd structure.
The currently known single-core or multi-core aluminum conductor or aluminum alloy conductor is generally twisted and tightly pressed into a fan-shaped, semicircular and circular structure by a circular single-core wire, the filling coefficient of the conductor is small, the surface is not smooth, the conductor is easy to bulge after the cable is bent, an insulation shield or insulation is easy to enter an insulation conductor gap after extrusion, or burrs of the conductor penetrate into the insulation or insulation shield, so that the electrical insulation performance of the cable is influenced.
The related prior art: CN101697287A discloses a compacted flexible cable conductor, CN202352364U discloses an aluminum alloy cable conductor, CN202976978U discloses a high-transmission-capacity cable conductor, CN104064256B discloses a special-shaped wire stranded cable conductor and a production method thereof, and CN204760064U discloses a graphene modified compacted round large-section cable conductor for smart energy.
During use, the cables have the condition that induced current, capacitance current and leakage current are conducted along the axial direction of the cables, so that the ground potential of the shielding layer of the cables is increased, and safety accidents are easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a long stator cable special for magnetic suspension, the conductor compactness of the cable is high, and the laying bending radius is small; in addition, the induced current, the capacitance current and the leakage current of the long stator cable can be effectively reduced, and the safety is improved.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is:
a special long stator cable for magnetic suspension is structurally characterized in that the long stator cable axially extends on the whole, and viewed from any section perpendicular to the length direction of the special long stator cable for magnetic suspension, the cable comprises a conductor positioned at the central position, and a conductor shielding layer, an insulating shielding layer, a sheath and a coating are sequentially extruded outside the conductor;
the resistivity of the insulating shielding layer is greater than that of the sheath, and the resistivity of the sheath is greater than that of the coating;
the conductor comprises a central line positioned at the central position, and a plurality of annular conductor layers arranged from inside to outside are arranged on the outer circumference of the central line; in the multiple layers of annular conductor layers, the innermost annular conductor layer arranged close to the central line is composed of a plurality of single-core conductors with trapezoidal sections, and the left side and the right side of each single-core conductor are close to the adjacent single-core conductors;
in the other annular conductor layers, each annular conductor layer is formed by twisting a plurality of Z-shaped type line single wires or a plurality of S-shaped type line single wires.
Therefore, the lock catch structure is formed by twisting the Z-shaped profile single wire or a plurality of S-shaped profile single wires,
according to the utility model discloses an embodiment, can also be right the utility model discloses do further optimization, following for optimizing the technical scheme who forms afterwards:
preferably, in the same annular conductor layer, the left side and the right side of each single wire are tightly attached to the adjacent single wires. This allows the outer diameter of the cable to be reduced for the same cross-section.
In order to further improve the smoothness of the long stator cable special for magnetic suspension and prevent the conductor from bulging when bent, all sharp corner parts of a single wire are arc-shaped in the same annular conductor layer;
in two adjacent single lines, the extension part of one single line extends into the gap of the other single line and is matched with the gap of the other single line.
The circular arc design can prevent point discharge.
The left lower part and the right upper part of the single wire extend outwards to form extension parts, the left upper part and the right lower part form gaps, or the left lower part and the right upper part of the single wire extend outwards to form gaps, and the left upper part and the right lower part form extension parts;
according to the utility model discloses a two kinds of embodiments, the central line is single round core or is formed by the sinle silk transposition of many fan-shaped cross-sections. The twisting mode can effectively prevent the conductor from being convex when the conductor is bent.
Preferably, the conductor is made of aluminum or an aluminum alloy.
In order to reduce the outer diameter of the cable on the same section and reduce the production cost, three annular conductor layers are arranged on the outer circumference of the central line, wherein the first annular conductor layer on the innermost layer is composed of a plurality of single-core conductors with trapezoidal sections, and the second annular conductor layer on the outermost layer and the third annular conductor layer on the middle layer are formed by twisting a plurality of Z-shaped line single wires or a plurality of S-shaped line single wires; wherein the second annular conductor layer and the third annular conductor layer have opposite twisting directions.
Preferably, the cable is sequentially provided with an insulating shielding layer, a sheath and a semiconductive coating from inside to outside in the radial direction, the insulating shielding layer, the sheath and the semiconductive coating are all made of semiconductive materials, and the resistivity of the insulating shielding layer, the resistivity of the sheath and the resistivity of the semiconductive coating are sequentially decreased progressively. This further reduces the induced currents, capacitive currents and leakage currents, so that the currents are conducted radially out along the cross-section of the cable.
Preferably, the twisting directions of the same annular conductor layer are the same, and the twisting directions of two adjacent annular conductor layers are opposite.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a long stator cable has reduced induced-current, electric capacity electric current and leakage current to reduce the ground potential of cable, improved the factor of safety that the cable used.
2. The utility model discloses a long stator cable conductor filling coefficient reaches more than 0.95.
3. The utility model discloses a long stator cable bending radius is little, low to 1.5 times's cable diameter.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is an enlarged view of a portion of the conductor of fig. 1.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
A long stator cable for magnetic levitation, as shown in FIG. 1, is longitudinally extended as a whole, and comprises a conductor 10 at a central position, a conductor shield 11 wound around the conductor 10, an insulating layer 12 wound around the conductor shield 11, an insulating shield 13 wound around the insulating layer 12, and a sheath 14 wound around the insulating shield 13, as viewed in any cross section perpendicular to the longitudinal direction of the long stator cable for magnetic levitation. Further, in order to prevent the occurrence of the crack and peeling phenomena of the sheath, a semiconductive coating 15 is coated on the outside of the sheath 14.
The insulating layer 12 is preferably an ethylene propylene rubber based compound. The conductor shield layer 11 and the insulation shield layer 13 are preferably EVA rubber-based mixtures, and the volume resistivity at room temperature should be between 1-100 Ω.
The jacket 14 is preferably a neoprene based compound. The sheath 14 not only has the functions of mechanical protection, ozone resistance, weather aging resistance and the like, but also has the functions of electric field shielding and grounding channels, and capacitance current flows to a grounding end through the conductive sheath and the semi-conductive coating, so the volume resistivity of the conductive sheath at room temperature is smaller and should be between 0.01 and 0.1 omega.
The semiconductive coating 15 is preferably a fluorocarbon-based coating, and is applied and cured to uniformly and closely adhere to the surface of the sheath, so that the sheath does not crack or peel off even if deformed.
In order to facilitate the radial conduction of the induced current, the capacitive current and the leakage current, avoiding axial conduction, the resistivity of said insulating shield 13 is greater than the resistivity of the sheath 14. The resistivity of the jacket 14 is greater than the resistivity of the semiconductive coating 15.
Preferably, the cable is provided with an insulating and shielding layer 13, a sheath 14 and a semi-conductive coating 15 from inside to outside in the radial direction, the insulating and shielding layer 13, the sheath 14 and the semi-conductive coating 15 are all made of semi-conductive materials, and the resistivity of the insulating and shielding layer 13, the resistivity of the sheath 14 and the resistivity of the semi-conductive coating 15 are gradually reduced.
The conductor comprises a center line 1 positioned at the center position, and three annular conductor layers arranged from inside to outside are arranged on the periphery of the center line 1. In the three annular conductor layers, the innermost annular conductor layer arranged close to the central line 1 is composed of a plurality of single-core conductors 3 with trapezoidal sections, and the left side and the right side of each single-core conductor 3 are close to adjacent single-core conductors. In other two-layer annular conductor layer, each layer of annular conductor layer is formed by twisting a plurality of Z-shaped molded line single lines 2 or a plurality of S-shaped molded line single lines 2, the twisting direction of the same annular conductor layer is the same, and the twisting directions of two adjacent layers of annular conductor layers are opposite.
Therefore, the central conductor adopts a rolling-stranding structure, the implementation is easy, the conductors are tightly buckled when the molded line structures are stranded, the filling coefficient of the conductors is improved, the outer diameter of the cable can be reduced due to the same section, the production cost is reduced, the conductors cannot bulge when being bent, the surface of the stranded conductors is smooth, and the electrical insulation performance of the cable is improved.
Preferably, as shown in fig. 2, the conductor of the long stator cable is composed of 1 round element wire, 7 trapezoidal element wires and 30Z element wires (1 +7+12+ 18) to constitute a compact soft aluminum alloy wire or aluminum conductor. Nominal conductor cross-sectional diameter: 300mm2The elongation at break of the conductor is 30% or more.
In the same annular conductor layer, the left side and the right side of each single wire 2 are tightly attached to the adjacent single wires. In the same annular conductor layer, the left lower part and the right upper part of the single wire 2 extend outwards to form extension parts 21, the left upper part and the right lower part form gaps 22, and in two adjacent single wires, the extension part 21 of one single wire extends into the gap 22 of the other single wire and is matched with the other single wire.
The structure in the center can have various structures, wherein, fig. 2 has 1 round single wire central line 1, and the twisted multi-core trapezoidal structure forms a round wire core. In addition, the cable conductor can also be provided with 2-4 fan-shaped wire cores twisted into a central line, and a plurality of trapezoidal structures on the outer layer are twisted into a circular wire core.
The long stator cable special for magnetic suspension in the embodiment is composed of molded line single wires, and the molded line single wires are Z-shaped molded lines or S-shaped molded line single wires, and the adjacent layers are twisted oppositely, when the twisted section is perpendicular to the length direction of the cable. The conductor of the present embodiment is made of aluminum or an aluminum alloy.
The use characteristics of the long stator cable of the present embodiment are as follows:
1. voltage class: 12/20 (24) kV;
2. conductor long-term operation allowable temperature: 90 ℃;
3. lowest temperature allowed during cabling: -15 ℃;
4. the lowest ambient temperature allowed for the cable in use: -40 ℃;
5. minimum bend radius allowed during installation and deployment: 1.5 times the cable diameter.
The above-mentioned embodiments are illustrative and should not be construed as limiting the scope of the invention, which is defined by the appended claims, and all modifications of the equivalent forms of the present invention which are obvious to those skilled in the art after reading the present invention.
Claims (8)
1. The long stator cable special for magnetic suspension is characterized in that the long stator cable extends axially on the whole, and viewed on any section perpendicular to the length direction of the long stator cable special for magnetic suspension, the cable comprises a conductor (10) positioned at the central position, and a conductor shielding layer (11), an insulating layer (12), an insulating shielding layer (13), a sheath (14) and a coating (15) are sequentially extruded outside the conductor (10);
the resistivity of the insulating shielding layer (13) is greater than that of the sheath (14), and the resistivity of the sheath (14) is greater than that of the coating (15);
the conductor comprises a center line (1) positioned at the center position, and a plurality of annular conductor layers arranged from inside to outside are arranged on the periphery of the center line (1) in the circumferential direction; in the multiple layers of annular conductor layers, the innermost annular conductor layer arranged close to the central line (1) is composed of a plurality of single-core conductors (3) with trapezoidal sections, and the left side and the right side of each single-core conductor (3) are close to the adjacent single-core conductors;
in the other annular conductor layers, each annular conductor layer is formed by twisting a plurality of Z-shaped type line single wires or a plurality of S-shaped type line single wires.
2. The long stator cable special for magnetic suspension according to claim 1, characterized in that, in the same annular conductor layer, the left and right sides of each single wire (2) are tightly attached to the adjacent single wires.
3. The long stator cable special for magnetic suspension as claimed in claim 1, wherein in the same annular conductor layer, all the sharp corner parts of the single wire (2) are arc-shaped;
the extension part (21) of one single wire extends into the gap (22) of the other single wire and is matched with the other single wire.
4. The long stator cable for magnetic suspension as claimed in any one of claims 1-3, wherein the central line (1) is a single round core or is formed by twisting a plurality of cores with sector cross-section.
5. The long magnetic levitation stator cable as claimed in any one of claims 1 to 3, wherein the conductor is made of aluminum or aluminum alloy.
6. The long stator cable special for magnetic suspension according to any one of claims 1 to 3, wherein three annular conductor layers are arranged on the periphery of the center line (1), wherein the innermost first annular conductor layer is composed of a plurality of single-core conductors (3) with trapezoidal cross sections, and the outermost second annular conductor layer and the middle third annular conductor layer are both formed by twisting a plurality of Z-shaped single-wire or a plurality of S-shaped single-wire; wherein the second annular conductor layer and the third annular conductor layer have opposite twisting directions.
7. The long stator cable special for magnetic suspension according to any one of claims 1 to 3, wherein the cable is sequentially provided with an insulating shielding layer (13), a sheath (14) and a semi-conductive coating from inside to outside in the radial direction, the insulating shielding layer (13), the sheath (14) and the semi-conductive coating are all made of semi-conductive materials, and the resistivity of the insulating shielding layer (13), the resistivity of the sheath (14) and the resistivity of the semi-conductive coating are gradually decreased.
8. The long stator cable for magnetic suspension dedicated to any one of claims 1 to 3, wherein the twisting directions of the same annular conductor layer are the same, and the twisting directions of two adjacent annular conductor layers are opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921504358.2U CN210429344U (en) | 2019-09-11 | 2019-09-11 | Special long stator cable for magnetic suspension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921504358.2U CN210429344U (en) | 2019-09-11 | 2019-09-11 | Special long stator cable for magnetic suspension |
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| Publication Number | Publication Date |
|---|---|
| CN210429344U true CN210429344U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921504358.2U Active CN210429344U (en) | 2019-09-11 | 2019-09-11 | Special long stator cable for magnetic suspension |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459353A (en) * | 2019-09-11 | 2019-11-15 | 金杯电工股份有限公司 | The dedicated long stator cable of magnetic suspension |
| CN113192698A (en) * | 2021-03-26 | 2021-07-30 | 胜利油田胜利泵业有限责任公司 | Positioning device and stranding device for long stator winding cable wires of magnetic suspension train |
-
2019
- 2019-09-11 CN CN201921504358.2U patent/CN210429344U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459353A (en) * | 2019-09-11 | 2019-11-15 | 金杯电工股份有限公司 | The dedicated long stator cable of magnetic suspension |
| CN113192698A (en) * | 2021-03-26 | 2021-07-30 | 胜利油田胜利泵业有限责任公司 | Positioning device and stranding device for long stator winding cable wires of magnetic suspension train |
| CN113192698B (en) * | 2021-03-26 | 2023-03-28 | 胜利油田胜利泵业有限责任公司 | Cable conductor stranding device for long stator winding of magnetic suspension train |
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