CN203260348U - Composite metal-fiber shielded variable-frequency cable - Google Patents
Composite metal-fiber shielded variable-frequency cable Download PDFInfo
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- CN203260348U CN203260348U CN 201320297697 CN201320297697U CN203260348U CN 203260348 U CN203260348 U CN 203260348U CN 201320297697 CN201320297697 CN 201320297697 CN 201320297697 U CN201320297697 U CN 201320297697U CN 203260348 U CN203260348 U CN 203260348U
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Abstract
The utility model is a composite metal-fiber shielded variable-frequency cable, comprising phase conductors, neutral conductors, a filler, an inside liner, a first shielding layer, a second shielding layer and an outer sheath from inside to outside. The cross section area of each phase conductor is larger than the cross section area of each neutral conductor. The number of the phase conductors is three and the number of the neutral conductors is also three. The phase conductors and the neutral conductors are symmetrically distributed at intervals and are concentrically intertwisted to form a cable. According to the composite metal-fiber shielded variable-frequency cable, conductors are distributed at intervals, and thus the consistency of the electric field phase positions of the conductors is guaranteed effectively, an unbalanced current is prevented from being superposed and amplified on the same lead, and the fact that a common cable can affect and destroy the cable insulation is effectively changed. The composite metal-fiber shielded variable-frequency cable adopts double shielding layers, and thus external emission of electromagnetic waves is effectively inhibited, and influence of an outer magnetic field on electric energy transmission on a cable is eliminated.
Description
Technical field
The utility model relates to field of cables, particularly relates to the delivery of electrical energy cable that a kind of operating frequency changes between 30～800Hz, is applicable to the energy-saving and frequency-variable governing system namely: the cable for connecting circuit of dynamic power transmission between frequency converter and the adjustable-speed motor.
Background technology
66% of front China generating total amount consumes on motor.And not quite only have about 5% by the energy-saving potential that improves the efficient of motor own.The utilization of variable-frequency control technique can make electric-motor drive efficient improve, and energy-saving potential can reach 30%.The ac variable frequency speed regulation power-saving technology is a complete power-saving technique system, this system mainly by 1. frequency converter, 2. alternating current motor, 3. the frequency-changing cable three parts form, and frequency-changing cable is in ac variable frequency speed regulation power-saving technology system, play the effect of delivery of electrical energy, be the important component part of frequency conversion speed-adjusting system, the utility model only relates to cable used in the frequency conversion speed-adjusting system.
The operation principle of frequency conversion speed-adjusting system mainly is: the rotating speed that changes motor by the adjusting to the electric energy frequency.But the power frequency electric energy of 50Hz is come in to realize to exchange (50Hz) → direct current → frequency-changing AC by frequency converter, and (30～800Hz) inversion speed-governing process can make the impact of electric energy transmitting strengthen, and electromagnetic field intensity changes aggravation.
Adopt common cable when this frequency conversion electric energy of transmission, the insulation of cable is easy to destroyed, and in cable laying approach scope, also environment carries out the electromagnetic viscosimeter radiation towards periphery simultaneously, thereby communication system work is produced interference, even the safety that also can threaten communication equipment and personnel.In addition; When extraneous electromagnetic signal and cable electromagnetic viscosimeter radiation signal generation coupling, the voltage and current of cable transmission electric power is changed, further aggravate the unsteadiness of cable transmission power quality.Unsettled dynamic power can cause relaying protection and automatics malfunction or tripping, makes its action lose selectivity, and reliability reduces, and causes easily systematic failures, the operation of serious threat security of system.
The utility model content
The purpose of this utility model is intended to solve the transmission frequency conversion electric energy (deficiency 30～800Hz) time in the existing cable technology.Solved effectively that (30～800Hz) frequency conversion electric energy in transmission course, electric field impacts the destruction to cable insulation, and electromagnetic radiation has improved the stability of frequency conversion delivery of electrical energy simultaneously to the interference of surrounding enviroment and cable itself, has guaranteed power supply quality.
The utility model adopts following technical scheme: a kind of composite metal fiber shielding frequency-changing cable comprises phase conductor, neutral conductor, filler, inner covering, the first screen, secondary shielding layer, oversheath from the inside to the outside; The area of section of described phase conductor is greater than the area of section of neutral conductor, described phase conductor and neutral conductor concentric stranding stranding.
In technique scheme, the quantity of described phase conductor and described neutral conductor all is three respectively.
In technique scheme, it is isolated symmetrical that described phase conductor becomes with neutral conductor.
In technique scheme, the surface of phase conductor and neutral conductor all is provided with insulating barrier.
In technique scheme, described the first screen is to dredge around shielding copper cash or braid shielded copper cash with one heart.
In technique scheme, the spacing in described the first screen between copper cash and the copper cash is not more than 5 ㎜.
In technique scheme, described secondary shielding layer is composite metal fiber conductive shield plastics.
The utility model has the advantage of:
The utility model adopts the construction of cable of optimizing: insulated electric conductor adopts isolated symmetrical concentric cabling structure, an earth connection neutral line in the common cable is divided into three, master core and the independent loop of the earth connection neutral line, it is isolated symmetrical to form three groups of loops, the unbalanced factor of current potential is integrated, guarantee the consistency of electric field phase, unbalanced electric current can not amplified same wire stack, effectively changed the impact failure of common cable transmission frequency conversion electric energy to cable insulation.Compare with existing common cable and to have improved 1 times useful life.
The utility model has adopted the double-layer shielding structure of optimizing: conductive shield plastics (EMI screening conductive plastics) and thin dual shield structure around copper cash that electro-magnetic screen layer adopts metallic fiber and PVC plastics to be composited, because cable has adopted the structure of double layer screen, cable can anti-electromagnetic induction, has solved the problem of the radiated interference in the bad and conduct electrical energy process of cable internal leakage current earthing; Make cable internal electromagnetic induction little, effectively stoped because of induced electromotive force excessive, on the impact of cable life.The double layer screen layer had both played and had suppressed the externally effect of emission of electromagnetic wave simultaneously, had got rid of again the impact of external magnetic field on the cable delivery of electrical energy.And common cable does not arrange screen, thereby can't prevent that electromagnetic interference is on the impact of cable body and surrounding environment.The stability of transmission of electricity electric energy is also far away from this this cable.
The utility model adopts new material, has reduced largely the manufacturing cost of cable, has optimized the manufacturing process of frequency-changing cable.Copper cash screen gap-Shi (being not more than 5 ㎜ by spacing) dredges on the bunchy cable core with one heart, not only plays the effect of electromagnetic shielding and leakage ground connection, has also reduced largely the use amount of copper cash; The mode that employing extrudes is coated on composite metal fiber conductive shield plastics (EMI screening conductive plastics) and dredges on copper cash, and the conductive plastics that this metallic fiber and PVC plastics are composited extrudes the efficient height, and screening effectiveness is strong, and cost is lower.It is the substitution material of the metal copper wire woven shield that adopts of conventional shielded electric wire.
Description of drawings
The utility model will illustrate by embodiment and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the axial cutaway view of Fig. 1;
Wherein: the 1st, oversheath 2 is that secondary shielding layer 3 is that the first screen 4 is that inner covering 5 is that insulating barrier 6 is that phase conductor 7 is that neutral conductor 8 is fillers.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
As depicted in figs. 1 and 2, the conductor structure that a kind of composite metal fiber shielding frequency-changing cable, the phase conductor 6 that three identical twisted copper wires of sectional area that arrange are in turn from inside to outside formed and the neutral conductor 7 that three identical twisted copper wires of sectional area are formed form; 7 one-tenth isolated symmetrical and concentric stranding bunchys of phase conductor 6 and neutral conductor, surface coverage one layer insulating 5 of each root phase conductor 6 and neutral conductor 7; Add filler 8 at the phase conductor 6 behind the stranding bunchy and the gap between the neutral conductor 7, to guarantee the rounding property of cable.Coat one deck inner covering 4 at the cable bundle, inner covering 4 can be to extrude the PVC plastics, also wrapped PVC band; At inner covering 4 the first screen 3, the first screens 3 are set and can adopt and dredge around the shielding copper cash, also can adopt the braid shielded copper cash, spacing is not more than 5 ㎜ and evenly concentric thin on the bunchy cable core between the copper cash in the screen and the copper cash; On the first screen 3, secondary shielding layer 2 is set again, secondary shielding layer 2 adopt the mode that extrudes with composite metal fiber conductive shield plastic overmold on the copper cash of the first screen 3; Adopt at last polyurethane elastomer (TPU) to be coated on the secondary shielding layer 2, form oversheath 1.
By implementing the cable of the utility model gained, electric energy transmitting wide frequency range (30～800Hz); The anti-electromagnetic-radiation interference performance is strong; The electric current effective grounding that electromagnetic induction can be produced; Can make the unbalanced electric current that produces in the three-phase power supply system give balance, stop the electrical breakdown of electric current stack to cable insulation, increase the useful life (the long-term use reaches: 30 years) of cable; Production efficiency is high; Low cost of manufacture.It is a kind of delivery of electrical energy circuit cable the most useful in the frequency conversion speed-adjusting system.
Disclosed all features in this specification except mutually exclusive feature, all can make up by any way.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. a composite metal fiber shields frequency-changing cable, it is characterized by to comprise from the inside to the outside phase conductor, neutral conductor, filler, inner covering, the first screen, secondary shielding layer, oversheath; The area of section of described phase conductor is greater than the area of section of neutral conductor, described phase conductor and neutral conductor concentric stranding stranding.
2. a kind of composite metal fiber according to claim 1 shields frequency-changing cable, and the quantity that it is characterized by described phase conductor and described neutral conductor all is three respectively.
3. a kind of composite metal fiber shielding frequency-changing cable according to claim 2 is characterized by described phase conductor and becomes isolated symmetrical with neutral conductor.
4. a kind of composite metal fiber according to claim 2 shields frequency-changing cable, and the surface that it is characterized by described phase conductor and neutral conductor all is provided with insulating barrier.
5. a kind of composite metal fiber shielding frequency-changing cable according to claim 1 is characterized by described the first screen for dredging around shielding copper cash or braid shielded copper cash with one heart.
6. a kind of composite metal fiber shielding frequency-changing cable according to claim 5 is characterized by that the spacing between the copper cash and copper cash is not more than 5 ㎜ in described the first screen.
7. a kind of composite metal fiber according to claim 1 shields frequency-changing cable, and it is characterized by described secondary shielding layer is composite metal fiber conductive shield plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320297697 CN203260348U (en) | 2013-05-28 | 2013-05-28 | Composite metal-fiber shielded variable-frequency cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320297697 CN203260348U (en) | 2013-05-28 | 2013-05-28 | Composite metal-fiber shielded variable-frequency cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203260348U true CN203260348U (en) | 2013-10-30 |
Family
ID=49472894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320297697 Expired - Fee Related CN203260348U (en) | 2013-05-28 | 2013-05-28 | Composite metal-fiber shielded variable-frequency cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203260348U (en) |
-
2013
- 2013-05-28 CN CN 201320297697 patent/CN203260348U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |