CN215577849U

CN215577849U - High temperature resistant mobile cable

Info

Publication number: CN215577849U
Application number: CN202121095399.8U
Authority: CN
Inventors: 李华斌; 马辽林; 胡湘华; 张滔
Original assignee: Hunan Valin Wire and Cable Co Ltd
Current assignee: Hunan Valin Wire and Cable Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2022-01-18
Anticipated expiration: 2031-05-21

Abstract

The utility model discloses a high-temperature-resistant mobile cable, which comprises a cable core and a sheath wrapped outside the cable core, wherein the cable core is formed by combining a conductor and an insulating layer wrapped outside the conductor, an aluminum alloy interlocking armor layer is armored outside the sheath, a stainless steel wire braid layer is wrapped outside the aluminum alloy interlocking armor layer, the aluminum alloy interlocking armor layer is arranged outside the sheath of the high-temperature-resistant mobile cable, an air heat insulation layer is formed between the aluminum alloy interlocking armor layer and the sheath, heat conduction can be isolated, the temperature outside the sheath of the cable core is kept to be far lower than the working condition temperature, the stable operation of the cable can be kept, and the service life of the cable can be effectively prolonged. The cable is also very flexible and can adapt to the working condition of frequent bending.

Description

High temperature resistant mobile cable

Technical Field

The utility model relates to the technical field of cables, in particular to a high-temperature-resistant mobile cable.

Background

At present, high-temperature-resistant cables (especially soft high-temperature-resistant cables) are generally ensured by adopting organic compounds, such as silicon rubber, fluoroplastic, polyimide and the like, but the temperature resistance level of the organic compounds is generally not more than 300 ℃, and the high-temperature-intermittent places such as steel slag cars still have great limitation, and the technical mode of adding a protective layer outside mica tape wrapping, steel wire weaving and the like is generally adopted, but for the working conditions of surface temperature of 800-900 ℃ and time duration of 1-2 min, the service life of the cable is short, and the problems of insulation resistance reduction, voltage breakdown and the like are caused by frequent use for 1 year or even half year.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art, and provides a high-temperature-resistant mobile cable.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a high temperature resistant travelling cable, includes the cable core and wraps up in the outside sheath of cable core, the cable core is formed by conductor and the insulating layer combination of wrapping up in the conductor outside, the chain armor of outside armor aluminum alloy of sheath, the outside parcel stainless steel wire weaving layer of the chain armor of aluminum alloy.

Specifically, the conductors adopt five types of conductors, and the twisting pitch is controlled to be 6-10 times, so that the stress in the conductors is fully released when the cable is bent.

Preferably, the material of the insulating layer is silicon rubber or fluoroplastic. The fluoroplastic is easy to crack when being extruded out of a large section, but the strength and the surface finish of the fluoroplastic are superior to those of silicon rubber, so that the fluoroplastic is used as an insulating layer material when the section of a cable core is smaller than 25 square millimeters, and the smooth surface of the fluoroplastic can enable an insulating wire core to freely move in a limited range when the cable moves so as to offset internal stress generated during bending, so that the cable is not easy to generate a phenomenon that local insulation is broken until a conductor is broken due to stress concentration after being bent for a long time. When the cross section is larger than 25 square, silicon rubber can be selected as the insulating layer material.

When the cable core is cabled, the ratio of the cabling pitch to the outer diameter of the cable core is controlled to be 6-10 times, so that the stress in the insulated wire core is fully released when the cable is bent.

The sheath is made of high-strength silicon rubber. The general silicone rubber can reach 200 ℃ in long-term service temperature grade, but the application of the silicone rubber in certain occasions is limited due to poor strength, tear resistance and oil resistance. The series products of the utility model adopt the protection measures outside and utilize the soft and high temperature resistance of the silicon rubber, so the silicon rubber is selected as the sheath.

Preferably, if the cable outer diameter is less than 10mm, an extruded fluoroplastic may also be selected as the sheath.

The aluminum alloy chain armor layer is armored outside the sheath in the form of aluminum alloy chain armor, and the inner diameter of the aluminum alloy chain armor is larger than the outer diameter of the silicon rubber sheath layer for insulation of external heat. Preferably, the inner diameter of the aluminum alloy interlocking armor layer is about 10mm larger than the outer diameter of the sheath, so as to ensure that a gap of about 5mm is formed between the aluminum alloy interlocking armor layer and the sheath in an ideal state.

Because the melting point of the aluminum alloy is only about 660 ℃ (different aluminum alloy types have different melting points), molten steel or steel slag falls on the aluminum alloy chain armor layer to be easily melted, and the interlocking connection part of the chain armor is easily clamped into substances such as external steel slag, a protective layer is woven outside the aluminum alloy chain armor layer by adopting stainless steel wires to be used as a part directly contacting with high-temperature steel slag, so that a stainless steel wire woven layer is formed. Considering that the cable needs to be bent and moved frequently, the weaving angle of the stainless steel wire braided layer is controlled to be 45-60 degrees, and the weaving density is 90-95%.

After the cable is laid, due to the dead weight of the cable, the cable is generally arranged at the lower part of the cylindrical space in the aluminum alloy chain armor layer, and the steel slag generally falls off and stays on the upper surface of the aluminum alloy chain armor layer, so that an air heat insulation layer with the thickness of 5mm-10mm is arranged outside the sheath of the cable except for the stainless steel wire braid layer and the aluminum alloy chain armor layer, and the temperature of the sheath is far lower than 200 ℃. Thus, the role of aluminum alloy interlocking armor includes the following two aspects: on one hand, gaps are generated inside the aluminum alloy interlocking armor layer to isolate heat conduction; on the other hand, the aluminum alloy chain armor layer can be used for supporting the stainless steel wire braid layer, and the process limitation that the cable braid layer can only be tightly woven outside the sheath during weaving is broken.

Tests and practical use prove that when steel slag with the temperature of 900 ℃ is placed on the surface of the cable for 2min for multiple times, the highest temperature of the cable sheath layer is only 170 ℃, which is lower than the long-term use temperature of the silicon rubber and the fluoroplastic, and the contact time of the steel slag is short, so that the accelerated aging of the cable sheath is avoided, and the service life of the cable is not influenced.

Compared with the prior art, the utility model has the beneficial effects that:

this high temperature resistant travelling cable's sheath outside sets up the chain armor of aluminum alloy, forms the air insulation layer between chain armor of aluminum alloy and the sheath, can completely cut off the heat conduction, keeps the outside temperature of cable core sheath far below the operating mode temperature, can keep the steady operation of cable, can effectively promote the life of cable simultaneously. The cable is also very flexible and can adapt to the working condition of frequent bending.

The high-temperature-resistant mobile cable adopts a mode of combining the galvanized stainless steel wire weaving with the aluminum alloy belt interlocking armor, and isolates a cable body from an external high-temperature environment, so that the cable can be bent and moved for a long time under the working condition of 800-900 ℃ and the time duration of 1-2 min, the problems that the cable cannot be moved frequently and the service life is short when the cable is used at an ultrahigh temperature are solved, and the service life is more than 5 times longer than that of the conventional cable.

Drawings

Fig. 1 is a schematic structural diagram of the high-temperature resistant mobile cable.

In the figure: 1. a wire; 2. an insulating layer; 3. a sheath; 4. an air insulation layer; 5. an aluminum alloy interlocking armor layer; 6. stainless steel wire braid layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1, the high temperature resistant mobile cable comprises a cable core and a sheath 3 wrapped outside the cable core, wherein the cable core is formed by combining a conductor 1 and an insulating layer 2 wrapped outside the conductor 1, an aluminum alloy chain armor layer 5 is armored outside the sheath 3, and a stainless steel wire braid layer 6 is wrapped outside the aluminum alloy chain armor layer 5.

Specifically, the conductor 1 adopts five types of conductors, and the twisting pitch is controlled to be 6-10 times, so that the stress in the conductor is fully released when the cable is bent.

In this embodiment, the material of the insulating layer 2 is fluoroplastic. The fluoroplastic is easy to crack when being extruded out of a large section, but the strength and the surface finish of the fluoroplastic are superior to those of silicon rubber, so that the fluoroplastic is used as an insulating layer material when the section of a cable core is smaller than 25 square millimeters, and the smooth surface of the fluoroplastic can enable an insulating wire core to freely move in a limited range when the cable moves so as to offset internal stress generated during bending, so that the cable is not easy to generate a phenomenon that local insulation is broken until a conductor is broken due to stress concentration after being bent for a long time.

The sheath 3 is made of high-strength silicon rubber. The general silicone rubber can reach 200 ℃ in long-term service temperature grade, but the application of the silicone rubber in certain occasions is limited due to poor strength, tear resistance and oil resistance. The series products of the utility model adopt the protection measures outside and utilize the soft and high temperature resistance of the silicon rubber, so the silicon rubber is selected as the sheath.

The form armor that the chain armor of aluminum alloy 5 adopted the chain armor of aluminum alloy is in the outside of sheath 3, and for guaranteeing outside thermal isolated, the internal diameter of the chain armor of aluminum alloy is greater than silicon rubber sheath layer external diameter. Preferably, the inner diameter of the aluminum alloy interlocking sheath 5 is about 10mm larger than the outer diameter of the sheath 3, so as to ensure that a gap of about 5mm is formed between the aluminum alloy interlocking sheath 5 and the sheath 3 in an ideal state.

Because the melting point of the aluminum alloy is only about 660 ℃ (different aluminum alloy types have different melting points), molten steel or steel slag falls on the aluminum alloy chain armor layer 5 and is easy to melt, and the interlocking connection part of the chain armor is easy to clamp substances such as external steel slag, a protective layer is woven outside the aluminum alloy chain armor layer 5 by adopting stainless steel wires to be used as a part directly contacting with high-temperature steel slag, and a stainless steel wire woven layer 6 is formed. Considering that the cable needs to be bent and moved frequently, the weaving angle of the stainless steel wire braid layer 6 is controlled to be 45-60 degrees, and the weaving density is 90-95%.

After the cable is laid, due to the dead weight of the cable, the cable is generally arranged at the lower part of the cylindrical space in the aluminum alloy interlocking armor layer 5, and the steel slag generally falls off and stays on the upper surface of the aluminum alloy interlocking armor layer 5, so that the outer part of the sheath 3 of the cable is provided with the air heat insulation layer 4 with the thickness of 5mm-10mm besides the stainless steel wire braid layer 6 and the aluminum alloy interlocking armor layer 5, and the temperature of the sheath 3 is far lower than 200 ℃. Thus, the role of the aluminum alloy interlocking armor 5 includes the following two aspects: on one hand, gaps are generated inside the aluminum alloy interlocking armor layer 5 to isolate heat conduction; on the other hand, the aluminum alloy interlocking armor layer 5 can be used for supporting the stainless steel wire braid layer 4, and the process limitation that the cable braid layer can only be tightly woven outside the sheath 3 when being woven is broken.

The sheath outside of the high temperature resistant mobile cable in this embodiment sets up the chain armor of aluminum alloy 5, forms air insulation layer 4 between chain armor of aluminum alloy 5 and the sheath, can completely cut off heat conduction, keeps the outside temperature of cable core sheath far below the operating mode temperature, can keep the steady operation of cable, can effectively promote the life of cable simultaneously. The cable is also very flexible and can adapt to the working condition of frequent bending.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides a high temperature resistant mobile cable, its characterized in that includes the cable core and wraps up in sheath (3) of cable core outside, the cable core is formed by conductor (1) and the insulating layer (2) combination of wrapping up in conductor (1) outside, there is the clearance between the outer wall of sheath (3) and the inner wall of the chain armor of aluminum alloy (5) in the chain armor of outside armor aluminum alloy (5) armor (5) of sheath (3), outside parcel stainless steel wire weaving layer (6) of the chain armor of aluminum alloy (5).

2. High temperature resistant mobile cable according to claim 1, characterized in that the conductors (1) are of five types, the stranding pitch being controlled between 6 and 10 times.

3. The high temperature resistant mobile cable according to claim 1, characterized in that the material of the insulating layer (2) is silicone rubber or fluoroplastic.

4. The high-temperature-resistant mobile cable according to claim 1, wherein the ratio of the cabling pitch to the outer diameter of the cable core is controlled to be 6-10 times.

5. The high-temperature resistant mobile cable according to claim 1, wherein the material of the sheath (3) is silicone rubber or fluoroplastic.

6. A high temperature resistant mobile cable according to claim 1, wherein the inner diameter of the aluminium alloy interlocking armour layer (5) is 9-11 mm larger than the outer diameter of the sheath (3).

7. The high temperature resistant mobile cable according to claim 6, wherein the stainless steel wire braid layer (6) is braided by stainless steel wires, the braiding angle is controlled to be 45-60 degrees, and the braiding density is 90-95%.