CN210805296U

CN210805296U - Special cable for symmetrical shielding of variable frequency motor

Info

Publication number: CN210805296U
Application number: CN201922391763.4U
Authority: CN
Inventors: 黄美华; 张哲新
Original assignee: CHONGQING KEBAO CABLE CO LTD
Current assignee: CHONGQING KEBAO CABLE CO LTD
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-06-19
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses a special cable for symmetrical shielding of a variable frequency motor, which relates to the field of variable frequency cables, and in order to achieve the purpose, the technical proposal of the utility model is that the special cable comprises a main wire core, a neutral wire core, a filler and a sheath; the cable comprises a main cable core, a neutral cable core, a sheath, a lining layer and an outer shielding layer, wherein the main cable core and the neutral cable core are respectively provided with three wires, the three main cable cores and the three neutral cable cores are symmetrically arranged and twisted to form a cable blank, the sheath is poured and coated on the periphery of the cable blank, the cable cores in the sheath are filled with fillers, and the lining layer and the outer shielding layer are wrapped between the cable blank and the sheath; the main wire cores are wrapped by the inner shielding layers, the main wire cores and the neutral wire cores are isolated by the inner shielding layers, and meanwhile each neutral wire core is located between the peripheries of the two main wire cores. Can avoid neutral sinle silk and the mutual interference between the main line core setting when avoiding the electromagnetic radiation of outer wall to can be effectual keep apart arbitrary two neutral sinle silks through the main line core.

Description

Special cable for symmetrical shielding of variable frequency motor

Technical Field

The utility model relates to a variable frequency motor symmetric shielding special cable mainly relates to frequency conversion cable field.

Background

At present, all aspects of equipment contained in the domestic and overseas variable frequency speed regulation technology reach quite high levels, but a connecting cable between a variable frequency motor and a variable frequency power supply is not paid enough attention. In the past, a general four-core power cable is generally adopted, wherein three main wire cores with larger cross sections and a neutral wire core with smaller cross section form a cable core, fillers are filled between the main wire cores and the neutral wire core, and then a sheath is extruded. The cable has no anti-static coupling and anti-electromagnetic induction capability in the use process, so that the cable has the problems of breakdown and short service life in a short time.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to above prior art, the utility model provides a inverter motor symmetric shielding special cable can avoid neutral sinle silk and the mutual interference between the sinle silk setting when avoiding the electromagnetic radiation of outer wall to can effectually keep apart two arbitrary neutral sinle silks through the sinle silk.

In order to achieve the above purpose, the technical scheme of the utility model is that: the cable comprises a main cable core, a neutral cable core, filler and a sheath; the cable comprises a main cable core, a neutral cable core, a sheath, a lining layer and an outer shielding layer, wherein the main cable core and the neutral cable core are respectively provided with three wires, the three main cable cores and the three neutral cable cores are symmetrically arranged and twisted to form a cable blank, the sheath is poured and coated on the periphery of the cable blank, the cable cores in the sheath are filled with fillers, and the lining layer and the outer shielding layer are wrapped between the cable blank and the sheath; the main wire cores are wrapped by the inner shielding layers, the main wire cores and the neutral wire cores are isolated by the inner shielding layers, and meanwhile each neutral wire core is located between the peripheries of the two main wire cores.

The technical principle and the beneficial effects of the utility model are as follows:

this scheme has set up the internal shield layer between main line core and neutral sinle silk to outside whole outer shielding layer that sets up can avoid neutral sinle silk and main line core to set up mutual interference between when avoiding the electromagnetic radiation of outer wall, is located two respectively through each this neutral sinle silk between the main line core periphery, consequently can effectually keep apart arbitrary two neutral sinle silks through the main line core, avoid neutral sinle silk to appear interfering each other. Through the lower and even positive and negative sequence impedance and zero sequence impedance of the cable, the resistance value of the shielding layer in the zero sequence working state is much lower than that of a common cable, and the cable is more favorable for the safe operation of other related equipment.

Preferably, the internal shielding layer adopts copper wire winding and copper strips to dredge and wind the double-structure shielding layer, can effectual suppression electromagnetic radiation, antistatic coupling, electromagnetic induction etc..

Preferably, the internal shielding layer is a copper wire braided shielding layer, and can effectively inhibit electromagnetic radiation, antistatic coupling, electromagnetic induction and the like.

Preferably, the outer shielding layer adopts the copper strips to wrap around the shielding layer, can effectual suppression electromagnetic radiation, antistatic coupling, electromagnetic induction etc..

Preferably, the conductors of the main wire core and the neutral wire core are conductors of a soft combined structure formed by stranding and complex stranding fine copper wires or stranded and pressed conductors, so that on one hand, the overall strength can be ensured, and on the other hand, the flexibility of the cable can be kept.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only one of the drawings of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

The cable comprises a main cable core 1, a neutral cable core 2, an inner shielding layer 3, an inner lining layer 4, an outer shielding layer 5 and a sheath 6.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely preferred embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

Example 1

The embodiment of the utility model provides an including main core 1, neutral sinle silk 2, filler and sheath 6.

The cable is characterized in that the number of the main cable cores 1 is three, the number of the neutral cable cores 2 is symmetrically arranged and twisted to form a cable blank, a layer of the sheath 6 is poured and coated on the periphery of the cable blank, fillers are filled between the cable cores in the sheath 6, and an inner liner layer 4 and an outer shielding layer 5 are coated between the cable blank and the sheath 6.

The main wire core 1 is wrapped by the inner shielding layer 3, the inner shielding layer 3 isolates the main wire core 1 from the neutral wire core 2, and meanwhile, each neutral wire core 2 is respectively positioned between the peripheries of the two main wire cores 1.

The inner shielding layer 3 is a shielding layer with a double-structure of copper wire winding and copper strip sparse winding, and can effectively inhibit electromagnetic radiation, antistatic coupling, electromagnetic induction and the like. The outer shielding layer 5 is a copper strip wrapped shielding layer, and can effectively inhibit electromagnetic radiation, antistatic coupling, electromagnetic induction and the like. The conductor of the main wire core 1 and the conductor of the neutral wire core 2 adopt a conductor of a soft combined structure of fine copper wire bundle twisting and complex twisting or twisting and pressing the conductors, so that on one hand, the overall strength can be ensured, and on the other hand, the flexibility of the cable can be kept.

This scheme has set up internal shield layer 3 between main core 1 and neutral sinle silk 2 to outside whole set up external shield 5, can be when avoiding the electromagnetic radiation of outer wall, can avoid neutral sinle silk 2 and main sinle silk 1 to set up mutual interference within a definite time, lie in two respectively through each this neutral sinle silk 2 between main sinle silk 1 periphery, consequently can effectually keep apart arbitrary two neutral sinle silks 2 through main sinle silk 1, avoid neutral sinle silk 2 to appear interfering each other. Through the lower and even positive and negative sequence impedance and zero sequence impedance of the cable, the resistance value of the shielding layer in the zero sequence working state is much lower than that of a common cable, and the cable is more favorable for the safe operation of other related equipment.

Three large wire cores and three small wire cores are symmetrically twisted into a cable core, so that the cable core has an interchange effect compared with a common power cable, and interference can be partially suppressed; adopt copper wire winding and copper strips to dredge around double-structure shielding, or copper strips around the package shielding or copper wires weave the shielding, can effectively restrain electromagnetic radiation, antistatic coupling, electromagnetic induction etc.. When the high-order potential wave current component appears on the line, the total current of the shielding layer is zero, and the interference to the outside is avoided.

Example 2

Compared with example 1, example 2 has how to distinguish the technical features: the inner shielding layer 3 is a shielding layer woven by copper wires, and can effectively inhibit electromagnetic radiation, electrostatic coupling resistance, electromagnetic induction and the like.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A special cable for symmetrical shielding of a variable frequency motor comprises a main wire core (1), a neutral wire core (2), filler and a sheath (6);

the cable is characterized in that the number of the main cable cores (1) and the number of the neutral cable cores (2) are three respectively, the three main cable cores (1) and the three neutral cable cores (2) are symmetrically arranged and twisted to form a cable blank, a layer of sheath (6) is poured and coated on the periphery of the cable blank, fillers are filled between the cable cores in the sheath (6), and an inner lining layer (4) and an outer shielding layer (5) are wrapped between the cable blank and the sheath (6);

the method is characterized in that: the main wire core (1) is wrapped by an inner shielding layer (3), and the main wire core (1) and the neutral wire core (2) are isolated by the inner shielding layer (3).

2. The symmetrical shielding special cable for the variable frequency motor according to claim 1, wherein: the inner shielding layer (3) is a shielding layer with a double structure of copper wire winding and copper strip sparse winding.

3. The symmetrical shielding special cable for the variable frequency motor according to claim 1, wherein: the inner shielding layer (3) is a shielding layer woven by copper wires.

4. The symmetrical shielding special cable for the variable frequency motor according to claim 1, wherein: the outer shielding layer (5) is a copper strip wrapped shielding layer.

5. The symmetrical shielding special cable for the variable frequency motor according to claim 1, wherein: the conductor of the main wire core (1) and the conductor of the neutral wire core (2) adopt a soft combined structure of thin copper wire bundle twisting and complex twisting or a twisted and compacted conductor.