CN204407075U - Low-voltage variable frequency cable - Google Patents

Abstract

The utility model discloses a low-voltage frequency conversion cable, which comprises a cable core. The cable core is wrapped with a wrapping layer, a shielding layer, an inner lining layer, an interlocking armor layer and a sheath layer from the inside to the outside. The cable core is composed of It consists of three main wire cores and three zero wire cores. Among the three main wire cores, two adjacent main wire cores are tangent to each other, and the connection line of the center of the cross-section of the three main wire cores forms a triangular shape. The zero wire cores are arranged in adjacent Between two main wire cores, and the zero wire core is tangent to the wrapping layer, the main wire core is composed of a first conductor and a first insulating layer arranged on the first conductor, and the first conductor has several strands of aluminum alloy The conductor is twisted and formed, and the first insulating layer is made of cross-linked polyethylene. The beneficial effects of the utility model are: the structure of the utility model ensures that the cable has excellent shielding ability during use, and the service life of the cable Can be significantly improved, thereby significantly improving the safety and reliability of the cable, while also saving the cost of the cable.

Description

Low voltage frequency conversion cable

technical field

The utility model relates to the technical field of power cables, in particular to a low-voltage frequency conversion cable.

Background technique

A cable is usually made of several wires or groups of conductors (at least two per group) twisted around a center, which is shaped like a rope and covered with a high degree of insulation.

Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc. They are all composed of single or multi-strand wires and insulation layers, and are used to connect circuits, electrical appliances, etc.

At present, all aspects of equipment included in the frequency conversion speed regulation technology at home and abroad are relatively mature, but the connection cable between the frequency conversion motor and the frequency conversion power supply has not received enough attention. In the past, a four-core cable was usually used. This cable consists of three sections. Composed of a larger main core and a neutral core with a smaller cross-section, fillers are filled between the main core and the neutral core, and then the sheath is extruded. The anti-static coupling and anti-electromagnetic induction capabilities cause the cable to break down in a short period of time and have a short service life.

Utility model content

The utility model overcomes the problem that the cable in the prior art has no anti-static coupling and anti-electromagnetic induction ability during use, and the cable has a breakdown in a relatively short time and the service life is very short, and provides a shielding effect that is excellent and saves energy. Product cost of low-voltage frequency conversion cables.

In order to achieve the above object, the utility model adopts the following technical solutions:

A low-voltage frequency conversion cable, which includes a cable core, the cable core is wrapped with a wrapping layer, a shielding layer, an inner lining layer, an interlocking armor layer and a sheath layer from the inside to the outside, and the cable core is composed of three main wires core and three zero-line cores, two adjacent main-line cores among the three main-line cores are tangent to each other, and the connection line of the center of the cross-section of the three main-line cores forms a triangle shape, and the zero-line cores are set in adjacent two Between the main wire cores, and the zero wire core is tangent to the wrapping layer, the main wire core is composed of a first conductor and a first insulating layer arranged on the first conductor, and the first conductor has several strands of aluminum alloy conductor strands The first insulating layer is made of cross-linked polyethylene.

In this technical solution, two adjacent main line cores among the three main line cores are firstly tangent to each other, and the connection line of the center of the cross-section of the three main line cores forms a triangle shape, and the zero line core is arranged on the adjacent two main line cores. Between, and the zero wire core is tangent to the wrapping layer, so that the main wire core and the zero wire core are evenly interlaced, so as to achieve the effect of balancing the electric field when transmitting power signals;

The first conductor uses an aluminum alloy conductor to replace the copper wire, which reduces the cost of the product, and at the same time meets the electrical conductivity requirements of the existing cable using a copper wire conductor. Under the same current carrying capacity of the cable, using an aluminum alloy material to make the cable conductor can reduce 30% %the cost of.

In this technical solution, by setting the interlocking armor layer, the interlocking armor layer is made of aluminum alloy material, which can achieve a certain shielding effect, and at the same time has a protective effect on the inner cable core, and can also be used in the process of laying cables. bellows, thereby also reducing installation costs.

A further technical solution is that the neutral core is composed of a second conductor and a second insulating layer arranged on the second conductor, the second conductor is formed by twisting several strands of aluminum alloy conductors, and the second insulating layer Layers are made of cross-linked polyethylene.

In this technical solution, both the first insulating layer and the second insulating layer are made of cross-linked polyethylene, because the cross-linked polyethylene material has a low dielectric coefficient and a small dielectric loss, and its temperature resistance and mechanical properties are also better than polyvinyl chloride. Both organic, electrical, thermal and other excellent properties, so the first insulating layer and the second insulating layer also have the above-mentioned excellent properties.

A further technical solution is that the wrapping layer is made of polyester tape.

A further technical solution is that the shielding layer is made of copper strips.

A further technical solution is that the thickness of the copper strip is 0.1 mm.

Since the shielding layer made of copper tape has a better shielding effect than the shielding layer formed of copper wire braiding, copper tape is selected in this technical solution. Since the copper tape is thinner, the shielding suppression coefficient is also very low, and the shielding The effect is not good, as the thickness of the copper strip increases, the shielding effect will also increase, but when the copper strip reaches a certain thickness, the change of the shielding coefficient will not be too obvious, so the copper strip with a thickness of 0.1mm is used in this technical solution , to achieve the best shielding effect.

A further technical solution is that the inner lining layer is made of polyvinyl chloride.

A further technical solution is that the sheath layer is made of halogen-free flame-retardant polyolefin.

A further technical solution is that a filler is provided between the main wire core and the zero wire core, and the filler is a PP mesh filler rope.

Compared with the prior art, the beneficial effects of the utility model are:

The structure of the utility model ensures that the cable has excellent shielding ability during use, so that the service life of the cable is significantly improved, thereby significantly improving the safety and reliability of the cable, and at the same time saving the cost of the cable.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the main wire core in the utility model.

Fig. 3 is a structural schematic diagram of the neutral wire core in the utility model.

In the figure, the corresponding reference numerals are:

1 main core, 2 neutral core, 3 filler, 4 wrapping layer, 5 shielding layer, 6 inner lining layer, 7 chain armor layer, 8 sheath layer, 11 first conductor, 12 first insulating layer, 21 The second conductor, 22 the second insulating layer.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further elaborated.

A low-voltage frequency conversion cable as shown in Figure 1-3, which includes a cable core, and the cable core is wrapped with a wrapping layer 4, a shielding layer 5, an inner lining layer 6, and an interlocking armor layer 7 in sequence from the inside to the outside. and a sheath layer 8, the cable core is composed of three main cores 1 and three zero cores 2, two adjacent main cores 1 of the three main cores 1 are tangent to each other, and the center of the cross section of the three main cores 1 The connecting line forms a triangular shape, the neutral core 2 is arranged between two adjacent main cores 1, and the neutral core 2 is tangent to the wrapping layer 4, and the main core 1 is set by the first conductor 11 and The first insulating layer 12 is formed on the first conductor 11, the first conductor 11 is formed by twisting several aluminum alloy conductors, the first insulating layer 12 is made of cross-linked polyethylene, and the neutral core 2 is composed of a second conductor 21 and a second insulating layer 22 arranged on the second conductor 21, the second conductor 21 is formed by twisting several strands of aluminum alloy conductors, and the second insulating layer 22 is made of cross-linked polyethylene Made, the filler 3 is provided between the main core 1 and the zero core 2, and the filler 3 is a PP mesh filler rope.

According to one embodiment of the present invention, the wrapping layer 4 is made of polyester tape, the shielding layer 5 is made of copper tape, the thickness of the copper tape is 0.1mm, and the inner lining layer 6 is made of It is made of polyvinyl chloride, and the sheath layer 8 is made of halogen-free flame-retardant polyolefin.

The above specific embodiments describe the essence of the utility model in detail, but can not limit the protection scope of the utility model. Obviously, under the enlightenment of the utility model, those of ordinary skill in the art can also make many improvements and modifications. It should be noted that these improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims (8)

1. a low-voltage variable frequency cable, it is characterized in that: it comprises cable core, described cable core is enclosed with lapping layer (4) from the inside to the outside successively, screen (5), inner covering (6), chain armour (7) and restrictive coating (8), described cable core is made up of three master cores (1) and three zero line cores (2), two master cores (1) adjacent in three master cores (1) are tangent between two, and the line in three master core (1) cross section centers of circle is formed triangular shaped, described zero line core (2) is arranged between two adjacent master cores (1), and zero line core (2) is tangent with lapping layer (4), described master core (1) is made up of the first conductor (11) and the first insulating barrier (12) be arranged on the first conductor (11), described first conductor (11) has the some bursts of stranded formation of aluminium alloy conductor, described first insulating barrier (12) adopts crosslinked polyethylene to make.

2. low-voltage variable frequency cable according to claim 1, it is characterized in that, described zero line core (2) is made up of the second conductor (21) and the second insulating barrier (22) be arranged on the second conductor (21), described second conductor (21) is formed by some strands of aluminium alloy conductors are stranded, and described second insulating barrier (22) adopts crosslinked polyethylene to make.

3. low-voltage variable frequency cable according to claim 1, is characterized in that, described lapping layer (4) adopts polyester belt to make.

4. low-voltage variable frequency cable according to claim 1, is characterized in that, described screen (5) adopts copper strips to make.

5. low-voltage variable frequency cable according to claim 4, is characterized in that, the thickness of described copper strips is 0.1mm.

6. low-voltage variable frequency cable according to claim 1, is characterized in that, described inner covering (6) adopts polyvinyl chloride to make.

7. low-voltage variable frequency cable according to claim 1, is characterized in that, described restrictive coating (8) adopts halogen-free anti-flaming polyolefin to make.

8. low-voltage variable frequency cable according to claim 1, is characterized in that, is provided with filler (3) between described master core (1) and zero line core (2), and described filler (3) is the netted gasket for packing of PP.