CN202339757U

CN202339757U - Frequency conversion cable

Info

Publication number: CN202339757U
Application number: CN2011205111765U
Authority: CN
Inventors: 严旭东; 曾庆安; 曾强; 夏杰
Original assignee: Chongqing Pigeon Electric Wire and Cable Co Ltd
Current assignee: Chongqing Pigeon Electric Wire and Cable Co Ltd
Priority date: 2011-12-09
Filing date: 2011-12-09
Publication date: 2012-07-18
Anticipated expiration: 2021-12-09

Abstract

The utility model discloses a frequency conversion cable, which comprises a cable core, a shielding layer and a sheath layer. The cable core consists of three main conductor cores with the cross sections of 120-degree sectors. Each conductor core comprises a conductor and an insulator wrapping the conductor. The shielding layer is divided into a first shielding layer and a second shielding layer, wherein the first shielding layer is an N-braided shielding layer; and the second shielding layer is a polyethylene (PE) braided shielding layer, and is arranged outside the first shielding layer. The technical shortcomings of overload and electromagnetic radiation easily caused by a neutral conductor of the cable in the prior art are overcome; and by the frequency conversion cable, the current-carrying capacity of the neutral conductor is improved, and the electromagnetic radiation can be effectively suppressed.

Description

Frequency-changing cable

Technical field

The utility model belongs to field of cables, is specifically related to a kind of frequency-changing cable.

Background technology

Being applied in of frequency control motor has very big development both at home and abroad in recent years, and annual growth surpasses 10%.Variable-frequency motor has more advantage: few like the equipment investment expense, simple in structure, volume is little, and cost is low, and is energy-conservation, and speed adjustable range is big, has the characteristic of permanent power, permanent rotating speed, easy to use, and capacity is big or the like.Therefore currently obtain more and more arriving use widely at metallurgy, mine, railway and commercial production everyway.

Handling characteristics analysis by frequency-changing cable: variable-frequency control technique is related to variable-frequency motor, variable frequency power supply and stube cable.Wherein frequency-changing cable length is also not very long, and the cross section is also not very big, and insulation property belong to the power cable category, and its actual operating frequency is 30～300 Hz, often abbreviates frequency-changing cable as.Frequency-changing cable is as the electric power transfer carrier of motor and frequency-variable controller; Because its through-put power is big, the power frequency of transmission changes also greatly; The electric power of its transmission simultaneously has not been complete sine wave, but the waveform profiles of a basic frequency, it has comprised many high order harmonic components.This has brought up its distinctive work characteristics: 1. pulse voltage is big to the influence of insulation; 2. the external launching electromagnetic wave of cable body causes electromagnetic pollution to environment; 3. the stack of neutral current.

This will have three big abilities by changes persuing frequency cable: 1. the inhibition higher harmonic voltage adds up and causes the ability of insulation breakdown; 2. suppress the ability that higher harmonic current adds up and causes the neutral line to transship; 3. suppress the ability of frequency electromagnetic waves to the pollution of environment.

Frequency-changing cable comprises cable core, screen and restrictive coating; It is that 3 core leader cables add that the N line cable formation 3+3 symmetrical structure that 3 core apportions are arranged adds copper strips PE shielding that frequency-changing cable commonly used adopts the 3+3 structure more; This kind structure is compact inadequately; The surface area of N line is unfavorable for for a short time dispelling the heat and increases the ampacity of N line, simultaneously because have only one deck shielding, so it is not high to suppress the ability of electromagnetic radiation pollution.

The utility model content

The technical problem that the utility model will solve provides a kind of ampacity of the neutral line and frequency-changing cable that can effectively suppress electromagnetic radiation of increasing.

In order to solve the problems of the technologies described above, the utility model provides following technical scheme:

A kind of frequency-changing cable comprises cable core, screen, and restrictive coating, said cable core are that the fan-shaped master core of 120 degree is formed by three cross sections, wherein master core comprises the insulator of conductor and parcel conductor; Said screen is divided into first screen and secondary shielding layer, and first screen is the N woven shield, and the secondary shielding layer is the PE woven shield, and the secondary shielding layer is located at outside first screen.

Further, be provided with interior lapping layer between the said cable core and first screen.

Further, be provided with insulating barrier between said first screen and the secondary shielding layer.

Further, be provided with outer lapping layer between said secondary shielding layer and the external sheath layer.

Adopt the frequency-changing cable of the utility model, have following beneficial effect: because cable core adopts three cross sections is that the fan-shaped master core of 120 degree is made, and makes construction of cable consolidation more; Because first screen is the N woven shield, so first screen can be used as neutral core again, the change of surface area is beneficial to heat radiation greatly, increases the ampacity of the neutral line again; In addition, adopt two-layer shielding layer structure can more effectively suppress electromagnetic radiation.

Description of drawings

Fig. 1 is the structural representation of the frequency-changing cable of prior art;

Fig. 2 is the structural representation of the utility model.

Embodiment

Below in conjunction with accompanying drawing and embodiment the technical scheme of the utility model is further specified:

Be illustrated in figure 1 as the structural representation of the frequency-changing cable of prior art; Frequency-changing cable shown in Figure 1 adopts the 3+3 structure; Promptly 3 core leader cables add the N line cable formation 3+3 symmetrical structure that 3 core apportions are arranged; Add copper strips PE shielding, specifically comprise conductor 11, insulating layer of conductor 12, filler 13, interior lapping layer 14, metal screen layer 15, outer lapping layer 16, external sheath layer 17.

Be illustrated in figure 2 as the structural representation of the utility model, this frequency-changing cable is followed successively by from inside to outside: the insulator 2, interior lapping layer of conductor 1, parcel conductor 3, first screen 4, insulating barrier 5, secondary shielding layer 6, outer lapping layer 7, external sheath layer 8.Said cable core is that the fan-shaped master core of 120 degree is formed by three cross sections, and wherein master core comprises the insulator 2 of conductor 1 and parcel conductor; Said screen is divided into first screen and secondary shielding layer, and first screen is the N woven shield, and the secondary shielding layer is the PE woven shield, and the secondary shielding layer is located at outside first screen.First screen has two effects: as the effect of screen, be the N woven shield owing to first screen on the other hand, so first screen still is the neutral core of the utility model frequency-changing cable on the one hand.Be provided with insulating barrier 5 between lapping layer 3, the first screens 4 and the secondary shielding layer 6 in being provided with between the cable core and first screen 4, be provided with outer lapping layer 7 between secondary shielding layer 6 and the external sheath layer 8.

Above-described only is the preferred implementation of the utility model; Should be understood that; For a person skilled in the art, under the prerequisite that does not break away from the utility model structure, can also make some distortion and improvement; These also should be regarded as the protection range of the utility model, and these can not influence effect and practical applicability that the utility model is implemented.

Claims

1. a frequency-changing cable comprises cable core, screen and restrictive coating, it is characterized in that: said cable core is that the fan-shaped master core of 120 degree is formed by three cross sections, and wherein master core comprises the insulator of conductor and parcel conductor; Said screen is divided into first screen and secondary shielding layer, and first screen is the N woven shield, and the secondary shielding layer is the PE woven shield, and the secondary shielding layer is located at outside first screen.

2. frequency-changing cable according to claim 1 is characterized in that: be provided with interior lapping layer between the said cable core and first screen.

3. frequency-changing cable according to claim 1 is characterized in that: be provided with insulating barrier between said first screen and the secondary shielding layer.

4. frequency-changing cable according to claim 1 is characterized in that: be provided with outer lapping layer between said secondary shielding layer and the external sheath layer.