CN213277479U

CN213277479U - Power cable for fire-resistant variable frequency motor

Info

Publication number: CN213277479U
Application number: CN202022320446.6U
Authority: CN
Inventors: 鲍时安; 金鑫; 何忠东; 邓标; 吴金; 李俊
Original assignee: Anhui Siait Cable Group Co ltd
Current assignee: Anhui Siait Cable Group Co ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-05-25
Anticipated expiration: 2030-10-16

Abstract

The utility model provides a power cable for fire-resistant variable frequency motor, including the principal line core, the earth core and from inside to outside in proper order cladding at the outside of principal line core and earth core around covering, shielding layer and restrictive coating, principal line core and earth core are equipped with three respectively, and three principal line cores and three earth core intervals strand into the cable core, and the center of cable core is equipped with firm frame, and the cable core is provided with the fine rope filling layer of fire-retardant glass in the clearance around between the covering; the stabilizing frame comprises a central triangular framework, a middle triangular elastic supporting frame and an outer arc-shaped stabilizing piece, the triangular framework is elastically connected with the triangular elastic supporting frame, an elastic cavity is formed between the triangular framework and the triangular elastic supporting frame, the back of the arc-shaped stabilizing piece is fixedly connected with the triangular elastic supporting frame, and the front of the arc-shaped stabilizing piece is wrapped on the periphery of the main wire core; the utility model provides a power cable for fire-resistant variable frequency motor, fire-retardant, fire-resistant, environmental protection, low cigarette, stable, anti extrusion, anti bending property are good.

Description

Power cable for fire-resistant variable frequency motor

Technical Field

The utility model relates to a wire and cable technical field indicates a power cable for fire-resistant variable frequency motor especially.

Background

In the last two decades, variable frequency speed regulating motors have been developed greatly at home and abroad, the annual growth rate is slightly over 10%, and the variable frequency speed regulating motors are widely used in industries such as metallurgy, mines, railways and the like, and are also widely applied to household appliances in recent years. Along with the increasing popularization of the application of the variable frequency speed control technology, correspondingly, higher technical requirements are also put forward on a power cable connected with the variable frequency speed control motor so as to avoid electromagnetic interference of higher harmonics generated by an alternating current circuit in operation on other power supply circuits and control circuits or interference of external electromagnetic waves, and the variable frequency cable special for the variable frequency speed control motor is designed for the purpose.

The structure of the current frequency conversion cable comprises three main line insulated wires and three zero line insulated wires, an inner wrapping layer, a copper tape layer, an outer wrapping layer and an outer sheath layer are sequentially arranged outside the main line insulated wires and the zero line insulation to form a 3+3 wire core structure, so that the cable has stronger voltage impact resistance, can bear pulse voltage during high-speed frequent frequency conversion, and plays a good role in protecting frequency conversion electrical appliances. But current variable frequency cable's fire-retardant, fire-resistant, environmental protection, low cigarette, stable, anti extrusion performance is not enough, for this reason, the utility model provides a fire-resistant variable frequency motor power cable to solve the problem that above-mentioned exists.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art's shortcoming, provide a power cable for fire-resistant inverter motor.

In order to solve the technical problem, the utility model provides a following technical scheme: a power cable for a fire-resistant variable frequency motor comprises main wire cores, ground wire cores, a wrapping layer, a shielding layer and a sheath layer, wherein the wrapping layer, the shielding layer and the sheath layer are sequentially coated outside the main wire cores and the ground wire cores from inside to outside; the stabilizing frame comprises a central triangular framework, a middle triangular elastic supporting frame and an outer arc-shaped stabilizing piece, the triangular framework is elastically connected with the triangular elastic supporting frame, an elastic cavity is formed between the triangular framework and the triangular elastic supporting frame, the back of the arc-shaped stabilizing piece is fixedly connected with the triangular elastic supporting frame, and the front of the arc-shaped stabilizing piece is wrapped on the periphery of the main wire core.

As a preferred technical scheme, the thread core and the earth core are all formed on the conductor by insulating layer, flame retardant coating from outside-in crowded package, the thread core includes copper conductor, flame retardant coating and insulating layer, the flame retardant coating sets up between copper conductor and insulating layer, and the flame retardant coating is two-layer forming around the package for two-sided mica tape, and two-layer mica tape is first mica tape flame retardant coating and second mica tape flame retardant coating respectively.

As an optimal technical scheme of the utility model, be glass fiber tape band layer around the covering.

As an optimized technical scheme of the utility model, the shielding layer is the copper strips shielding layer, and this copper strips shielding layer is 0.1 mm's oxygen-free pure copper strips for thickness.

As an optimized technical scheme of the utility model, the restrictive coating is the fire-retardant oversheath of low smoke and zero halogen.

As an optimized technical scheme of the utility model, the insulating layer is the crosslinked polyethylene insulating layer.

As an optimal technical scheme of the utility model, the copper conductor adopts the anaerobic copper wire transposition to form, and the cross-section of copper conductor is greater than 6 square millimeters.

The utility model discloses the beneficial effect who reaches is:

1. the utility model provides a power cable for fire-resistant variable frequency motor adopts the anaerobic copper wire transposition to make, has following advantage: (1) the conductivity, bending property, creep resistance and corrosion resistance of the cable are improved, and the connection stability of the cable even if the cable is overloaded and overheated for a long time is ensured; (2) electrical properties: the conductivity of the copper conductor is ensured because the conductivity of the copper conductor is not influenced in the twisting process, and the conductivity of the copper conductor is second to that of the silver; (3) mechanical properties: the copper core cable has good ductility and high strength, and the allowable stress can reach 20N/mm2 at normal temperature; (4) corrosion resistance: the copper core cable has good thermal stability, corrosion resistance and oxidation resistance; (5) the copper core cable is convenient to construct, and the copper core cable is good in flexibility and small in allowable bending radius, so that the copper core cable is convenient to bend and easy to penetrate a pipe; the copper core is anti-fatigue and difficult to break after being repeatedly bent, so that the wiring is convenient.

2. The utility model provides a power cable for fire-resistant variable frequency motor adopts low smoke and zero halogen flame retardant material to make the sheath layer, has fire-retardant, fire-resistant, environmental protection, low smoke, nontoxic characteristic, when the conflagration breaks out, can ensure personal safety;

3. the utility model provides a power cable for fire-resistant variable frequency motor, the printing opacity is high when burning, reaches 99%, only produces trace smog to reduce the harm to human body and instrument equipment, reach the fire-retardant A level requirement of low smoke and zero halogen;

4. the utility model provides a power cable for fire-resistant variable frequency motor through the firm frame that sets up, has not only guaranteed cable internal connection's steadiness, prevents that the sinle silk from shifting at the removal in-process, has still improved the anti extrusion and the anti bending capability of cable.

The present invention will be described in more detail with reference to the accompanying drawings and examples.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of the fixing frame of the present invention;

FIG. 3 is a schematic view of the triangular framework structure of the present invention;

FIG. 4 is a schematic view of the triangular elastic support frame of the present invention;

FIG. 5 is a schematic structural view of the arc-shaped fixing piece of the present invention;

reference numbers in the figures: 1. a main wire core; 11. a copper conductor; 12. an insulating layer; 13. a first mica tape refractory layer; 14. a second mica tape refractory layer; 2. a ground wire core; 3. wrapping a covering; 4. a shielding layer; 5. a sheath layer; 6. a stabilizing frame; 61. a triangular framework; 62. a triangular elastic support frame; 63. an arc-shaped stabilizing sheet; 7. and a flame-retardant glass fiber rope filling layer.

Detailed Description

The terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like in the specification indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b): as shown in fig. 1-5, the utility model provides a fire-resistant power cable for variable frequency motor, including the main line core 1, ground core 2 and from inside to outside in proper order cladding at the outside of main line core 1 and ground core 2 around covering 3, shielding layer 4 and restrictive coating 5, main line core 1 and ground core 2 are equipped with three respectively, and three main line cores 1 and three ground core 2 interval stranding become the cable core, and the center of cable core is equipped with steady frame 6, is provided with fire-retardant glass fiber rope filling layer 7 in the clearance between cable core and around covering 3; the firm piece 63 that stabilizes of triangle skeleton 61, the triangle elastic support frame 62 in middle and the outside arc at center is drawn together to firm frame 6, triangle skeleton 61 elastic connection triangle elastic support frame 62, and form elasticity cavity 64 between triangle skeleton 61 and the triangle elastic support frame 62, the back rigid coupling triangle elastic support frame 62 of arc firm piece 63, the front cladding is in the periphery of thread core 1.

Further, the main line core 1 and the ground wire core 2 are formed by extruding and wrapping insulating layers and fire-resistant layers on conductors from outside to inside, the main line core 1 comprises a copper conductor 11, a fire-resistant layer and an insulating layer 12, the fire-resistant layer is arranged between the copper conductor 11 and the insulating layer 12, the fire-resistant layer is formed by wrapping two layers of double-faced mica tapes, and the two layers of mica tapes are respectively a first mica tape fire-resistant layer 13 and a second mica tape fire-resistant layer 14.

Furthermore, the wrapping layer 3 is a glass fiber tape wrapping layer, and the fire resistance is good.

Furthermore, the shielding layer 4 is a copper strip shielding layer, and the copper strip shielding layer is an oxygen-free pure copper strip with the thickness of 0.1 mm.

Furthermore, the sheath layer 5 is a low-smoke halogen-free flame-retardant outer sheath, has the characteristics of flame retardance, fire resistance, environmental protection, low smoke and no toxicity, and can ensure personal safety when a fire disaster occurs.

Further, the insulating layer 12 is a crosslinked polyethylene insulating layer.

Furthermore, the copper conductor 11 is formed by twisting oxygen-free copper wires, and the cross section of the copper conductor 11 is larger than 6 square millimeters, so that the conductivity, the bending property, the creep resistance and the corrosion resistance of the cable are improved, and the connection stability of the cable even if the cable is overloaded and overheated for a long time is ensured.

The above embodiments are merely to describe the preferred embodiments of the present invention, and are not to limit the scope of the present invention, and various modifications and improvements made by the technical solutions of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.

Claims

1. The power cable for the fire-resistant variable frequency motor is characterized by comprising three main wire cores (1), three ground wire cores (2), a wrapping layer (3), a shielding layer (4) and a sheath layer (5), wherein the wrapping layer (3), the shielding layer and the sheath layer are sequentially coated outside the main wire cores (1) and the ground wire cores (2) from inside to outside, the three main wire cores (1) and the three ground wire cores (2) are twisted into a cable core at intervals, a stabilizing frame (6) is arranged at the center of the cable core, and a flame-retardant glass fiber rope filling layer (7) is arranged in a gap between the cable core and the wrapping layer (3); the stable frame (6) includes triangle skeleton (61), middle triangle elastic support frame (62) and the arc firm piece (63) of outside at center, triangle skeleton (61) elastic connection triangle elastic support frame (62), and form elasticity cavity (64) between triangle skeleton (61) and triangle elastic support frame (62), the periphery at main line core (1) is wrapped in to the back rigid coupling triangle elastic support frame (62) of arc firm piece (63), positive cladding.

2. The power cable for the fire-resistant variable frequency motor according to claim 1, wherein the main wire core (1) and the ground wire core (2) are formed by extruding an insulating layer and a fire-resistant layer from outside to inside on a conductor, the main wire core (1) comprises a copper conductor (11), a fire-resistant layer and an insulating layer (12), the fire-resistant layer is arranged between the copper conductor (11) and the insulating layer (12), the fire-resistant layer is formed by wrapping two layers of double-sided mica tapes, and the two layers of mica tapes are respectively a first mica tape fire-resistant layer (13) and a second mica tape fire-resistant layer (14).

3. A power cable for a fire-resistant variable frequency motor according to claim 1, characterized in that the wrapping layer (3) is a glass fiber tape wrapping layer.

4. A power cable for a fire-resistant inverter motor according to claim 1, characterized in that the shielding layer (4) is a copper tape shielding layer, which is an oxygen-free pure copper tape with a thickness of 0.1 mm.

5. The power cable for the fire-resistant variable frequency motor according to claim 1, wherein the sheath layer (5) is a low-smoke halogen-free flame-retardant outer sheath.

6. A power cable for a fire-resistant variable frequency motor according to claim 2, characterized in that the insulating layer (12) is a crosslinked polyethylene insulating layer.

7. The power cable for the fire-resistant variable frequency motor according to claim 2, wherein the copper conductor (11) is formed by stranding oxygen-free copper wires, and the cross section of the copper conductor (11) is larger than 6 square millimeters.