RU176966U1 - POWER FLEXIBLE CABLE - Google Patents

Abstract

The utility model relates to cable technology, namely, flexible shielded power cables intended for connecting self-propelled cars with an electric drive to electric networks for a rated alternating voltage of alternating current up to 1140 V at a nominal frequency of 50 Hz on main conductors and up to 220 V on an auxiliary core. A flexible power cable contains three main conductive conductors, each of which is coated with rubber insulation and an electrically conductive rubber screen, an auxiliary core coated with rubber insulation and an electrically conductive rubber screen, a grounding conductor and an outer sheath, while these conductors are twisted around a polymer core with filling the inter-core space.

Description

The technical field to which the utility model relates.

The utility model relates to cable technology, namely, flexible shielded power cables intended for connecting self-propelled cars with an electric drive to electric networks for a rated alternating voltage of alternating current up to 1140 V at a nominal frequency of 50 Hz on main conductors and up to 220 V on an auxiliary core.

State of the art

A flexible power cable is known, containing three main conductive cores, with internal and external screens of electrically conductive rubber, between which there is rubber insulation, an auxiliary core insulated with high rigidity polymer, a grounding conductor and a two-layer sheath (patent RU No. 27965 U1, IPC Н01В 7 / 04, published February 27, 2003).

Signs of the known cable, which are common with the features of the claimed utility model, are that the flexible power cable contains three main conductive wires with rubber insulation and an external screen of conductive rubber, an auxiliary core coated with insulation, and a sheath.

The reason that prevents obtaining the claimed technical result in a known cable is that the insulation of the auxiliary core is made of high rigidity polymer, as well as in the absence of a screen on top of the insulation.

The closest known technical solutions (prototype) is a flexible power cable, consisting of three main shielded conductors with rubber insulation, an earth conductor, an auxiliary shielded core with rubber insulation of equal cross section with the main conductors, in a rubber sheath that does not spread combustion, insulated and shielded cores are twisted around a grounding conductor with filling the gaps between the cores with reinforcing rubber tows based on synthetic threads (patent RU No. 49346 U1, IPC Н01В9 / 00, published but November 10, 2005).

Signs of a known cable that are common with the claimed utility model are that the cable contains three main shielded conductors with rubber insulation, a ground conductor, an auxiliary shielded core with rubber insulation and a sheath.

The reason that prevents obtaining the claimed technical result in a known cable is that the cable with the indicated arrangement of cores is made: insulated and shielded main cores and insulated and shielded auxiliary cores are twisted around the ground conductor with filling the gaps between the cores. With the indicated location of the grounding conductor in the center of the cable, there is a probability of destruction of a large number of core wires (more than 30%) with repeated bending of the cable.

The technical problem is the need to strengthen the cable design and to expand the arsenal of power flexible cables.

Utility Model Disclosure

The technical result consists in improving the operational characteristics of the cable, in increasing the resistance of the cable to repeated bending (the number of destroyed ground wires is less than 30%).

The technical result is achieved in that the power flexible cable contains three main conductive cores, each of which is coated with rubber insulation and an electrically conductive rubber shield, an auxiliary core coated with rubber insulation and an electrically conductive rubber shield, a ground conductor and an outer sheath, while these conductors are twisted around a polymer core with filling the intervein space.

Distinctive features of the claimed technical solution lies in the fact that the main conductors, auxiliary core and ground conductor are twisted around the core, while the ground conductor is located in the coil.

Utility Model Implementation

Due to the fact that the technical result is achieved by the indicated arrangement of the conductors, namely: the main conductors, auxiliary conductors and ground conductors are twisted around the core, cable modifications with additional structural elements do not affect the achievement of the technical result.

Within the claimed patent rights, the following embodiments of the utility model are possible.

A flexible power cable contains three main conductive conductors, each of which is coated with rubber insulation and an electrically conductive rubber screen, an auxiliary core coated with rubber insulation and an electrically conductive rubber screen, a grounding conductor and an outer sheath, while these conductors are twisted around a polymer core with filling the inter-core space.

The inter-core space of the cable can be filled with three rubber reinforcing plaits or the inner layer of a two-layer sheath.

The outer sheath of the cable can be made of two-layer and hardened with synthetic filaments in the form of a braid.

The polymer core can be made on the basis of polyester yarns.

The ground conductor may be coated with a layer of conductive rubber.

The outer shell may be made of thermoplastic polyurethane.

The manufacture of the cable is as follows.

Conductors are made of copper round, 5 classes of flexibility in accordance with GOST 22483, from the wire, traditional for electric cables, the strands are twisted using ordinary twisting equipment.

Rubber insulation and a shield of electrically conductive rubber are superimposed on the main conductive wires on the continuous vulcanization unit.

On the auxiliary core on the continuous vulcanization unit, rubber insulation and a shield of electrically conductive rubber are superimposed.

A layer of electrically conductive rubber may be applied to a ground conductor on a continuous vulcanization unit.

The insulated shielded main conductors, the uninsulated ground conductor and the insulated shielded auxiliary conductor are twisted alternately around the polymer core on a general twisting machine.

The inter-core space can be filled with polymer strands, which are alternately twisted with strands around the polymer core in a general twisting machine.

On top of the twisted cores on the extrusion line, an outer sheath is applied.

Flexible power cable has been successfully tested under production conditions. Samples of the power flexible cable were tested for resistance to repeated bending according to GOST 12182.1 (after exposure, the insulation and sheath should not have cracks, and the number of broken wires in each core should not exceed 30%). Flexible power cable has been tested successfully.

Claims (6)

1. A flexible power cable, comprising three main conductive cores, each coated with rubber insulation and an electrically conductive rubber shield, an auxiliary core coated with rubber insulation and an electrically conductive rubber shield, a ground conductor and an outer sheath, characterized in that said cores are twisted around a polymer core with filling the inter-core space. 2. The cable according to claim 1, characterized in that the inter-core space is filled with three rubber reinforcing ropes. 3. The cable according to claim 1, characterized in that the outer shell is made of a two-layer rubber and reinforced with synthetic threads in the form of a braid. 4. The cable according to claim 1, characterized in that the core is made on the basis of polyester threads. 5. The cable according to claim 1, characterized in that the grounding conductor is covered with a layer of conductive rubber. 6. The cable according to claim 1, characterized in that the outer sheath is made of thermoplastic polyurethane.