High-temperature-resistant low-voltage cable

Abstract

The utility model discloses a high-temperature-resistant low-voltage cable which comprises a cable core and a sheath used for wrapping the cable core, the cable core comprises a plurality of wire cores and a plurality of heat dissipation pipes, and the heat dissipation pipes are arranged between the wire cores; the structure of the wire core is provided with a conductor, a first insulating layer and a second insulating layer in sequence from inside to outside, and the sheath is provided with a wrapping tape, a fireproof shielding layer, a heat insulation layer and an outer protection layer in sequence from inside to outside. The cable is reasonable in structural design, and has the following beneficial effects: the radiating tube is additionally arranged between the center of the cable core and the wire cores, and the wire cores are separated through the radiating tube, so that the wire cores can be prevented from being mutually extruded, and the service life of the wire cores is prolonged; and when the cable core works for a long time to generate heat, the cable core can be connected in the heat dissipation pipe by utilizing air exhaust equipment, so that the heat in the cable can be quickly discharged, the high-temperature resistance and the heat exchange capability of the cable core are improved, and the current-carrying capability of the cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a high temperature resistant low voltage cable. Background Art

[0002] With the rapid development of my country's economy, the demand for high-temperature cables in special industries has shown a rapid growth stage. The market demand for heat-resistant and high-temperature cables is growing at an annual rate of 20%. As an important component of special cables, high-temperature resistant cables have extremely strong vitality and are in short supply. For this reason, my country needs to import about 2 billion yuan of high-temperature resistant cables from abroad for domestic construction every year.

[0003] Generally speaking, cables can be used for mass production because of the low cost of plastics and rubber, and plastics and rubber are the main raw materials for the insulation sheath of wires and cables. However, for some special industries such as petrochemicals, steel, aerospace, shipbuilding, military industry, pharmaceuticals, food, plastic machinery, boilers and other industries related to heat and high temperature, these special fields require that all supporting facilities can operate normally at high temperatures. Among all the supporting equipment, the most important non-high temperature resistant wires and cables are the ones. Only by equipping with high temperature resistant wires and cables can the normal power supply be ensured. During the current use process, the cables are prone to the following problems: 1. In a high temperature working environment, the electrical performance of the cables is often affected by the cables' inability to withstand high temperatures, thereby affecting the normal use of the cables. 2. The cables have poor anti-aging performance and short service life. 3. The flame retardant and fireproof properties are poor, which can easily lead to loss of life and property in the event of a fire. Therefore, it is urgent to develop a high temperature resistant low voltage cable that can be used in high temperature places and cope with strong fires. Utility Model Content

[0004] The utility model aims to provide a high temperature resistant low voltage cable which can be used in high temperature places and cope with strong fire.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a high-temperature resistant low-voltage cable, including a cable core and a sheath for wrapping the cable core, the cable core including a plurality of wire cores and a plurality of heat dissipation tubes, and heat dissipation tubes are arranged between the wire cores; the structure of the wire core is provided with a conductor, a first insulating layer, and a second insulating layer in sequence from the inside to the outside, and the sheath is provided with a wrapping tape, a fireproof shielding layer, a thermal insulation layer, and an outer protective layer in sequence from the inside to the outside.

[0006] Furthermore, the cable core includes three wire cores and four heat dissipation tubes. A heat dissipation tube is arranged in the center of the cable core, and the remaining three wire cores and the three heat dissipation tubes are symmetrically arranged around the heat dissipation tube at the center position. The wire cores and heat dissipation tubes in the outer circle are arranged at intervals around the heat dissipation tube at the center position of the cable core.

[0007] Furthermore, the conductor is a fifth type of soft copper conductor.

[0008] Furthermore, the conductor is twisted in a concentric and unidirectional bundled and twisted manner.

[0009] Furthermore, the first insulating layer is a calcined mica tape, which is wrapped around the conductor in three overlapping layers, with an overlapping rate of 30%-40% for each layer; the second insulating layer is a high temperature resistant silicone rubber.

[0010] Furthermore, the heat dissipation pipe is a high temperature resistant heat dissipation pipe.

[0011] Furthermore, the wrapping tape is an overlapping wrapping tape of low-smoke, halogen-free and highly flame-retardant tape.

[0012] Furthermore, the fireproof shielding layer is made of copper strip embossed longitudinally wrapped by argon arc welding.

[0013] Furthermore, the thermal insulation layer is a ceramicized polyolefin fireproof sheath.

[0014] Furthermore, the outer protective layer is PTFE (Teflon) polytetrafluoroethylene plastic.

[0015] In summary, the device structure of the utility model is reasonably designed, and the use of the technical scheme of the utility model has the following beneficial effects: the technical scheme of the utility model provides a high-temperature resistant low-voltage cable, whose cable core includes a plurality of wire cores and a plurality of heat dissipation tubes, and heat dissipation tubes are arranged between the wire cores; compared with traditional cables, the utility model has a unique structural design, and a heat dissipation tube is added between the center of the cable core and the wire core. The heat dissipation tube is used to separate the various wire cores, which can prevent the wire cores from being squeezed against each other and improve the service life of the wire core; and when the cable core generates heat during long-term operation, an exhaust device can be used to connect to the heat dissipation tube, so that the heat inside the cable can be quickly discharged, and the heat will not accumulate inside the cable core, thereby improving the high temperature resistance and heat exchange capacity of the cable core, thereby improving the current carrying capacity of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model high temperature resistant low voltage cable;

[0017] Explanation of the reference numerals: 1 - conductor; 2 - first insulating layer; 3 - second insulating layer; 4 - heat dissipation pipe; 5 - wrapping tape; 6 - fireproof shielding layer; 7 - thermal insulation layer; 8 - outer protective layer. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0019] In the present invention, for a clearer description, the following explanation is made: the observer faces the attached Figure 1 For observation, the left front side of the observer is set as the front, the right rear side of the observer is set as the rear, the left rear side of the observer is set as the left, the right front side of the observer is set as the right, the top of the observer is set as the top, and the bottom of the observer is set as the bottom. It should be pointed out that the terms "front end", "rear end", "left side", "right side", "middle", "top", "bottom" and the like in the text indicate the orientation or position relationship based on the orientation or position relationship set in the drawings, which is only for the convenience of clearly describing the utility model, and does not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clarifying or simplifying the description, and cannot be understood as indicating or implying relative importance or quantity.

[0020] See also Figure 1 The utility model provides a high temperature resistant low voltage cable, including a cable core and a sheath for wrapping the cable core, the cable core includes a plurality of wire cores and a plurality of heat dissipation tubes 4, and heat dissipation tubes 4 are arranged between the wire cores; the structure of the wire core is sequentially provided with a conductor 1, a first insulating layer 2, and a second insulating layer 3 from the inside to the outside, and the sheath is sequentially provided with a wrapping tape 5, a fireproof shielding layer 6, a heat insulation layer 7, and an outer protective layer 8 from the inside to the outside.

[0021] As a preferred embodiment of the utility model, the cable core includes three wire cores and four heat dissipation tubes 4. A heat dissipation tube 4 is arranged in the center of the cable core, and the other three wire cores and the three heat dissipation tubes 4 are symmetrically arranged around the heat dissipation tube 4 at the center position. The wire cores and the heat dissipation tubes 4 of the outer circle are arranged at intervals around the heat dissipation tube 4 at the center position of the cable core.

[0022] Specifically, the conductor 1 is a fifth type of soft copper conductor, and the conductor 1 is twisted in a concentric and unidirectional bundled and twisted manner. The conductor 1 is a fifth type of soft copper conductor, and the concentric and unidirectional bundled and twisted manner is selected, which is not only resistant to bending and compact in structure, but also helps to reduce the outer diameter of the conductor.

[0023] As a preferred embodiment of the utility model, the first insulating layer 2 is a calcined mica tape, which is wrapped around the conductor 1 in three overlapping layers, with an overlapping rate of 30%-40% for each layer; the second insulating layer 3 is a high temperature resistant silicone rubber.

[0024] The first insulating layer 2 is a calcined mica tape. The traditional fire-resistant insulation structure - fire-resistant layer + insulating extruded layer is abandoned in the process design. Three layers of calcined mica tape are overlapped and wrapped around the conductor 1. The overlap rate of each layer reaches 30%-40%. The setting of the mica tape fully meets the high temperature resistance requirements of this type of cable. At the same time, the material is soft, easy to process, high temperature resistant and has excellent fire resistance.

[0025] The second insulating layer 3 is made of high temperature resistant silicone rubber, which ensures good insulation resistance and electrical safety performance. It is also soft, has good heat aging resistance, long service life, and is low smoke, halogen-free and flame retardant.

[0026] Specifically, the heat dissipation pipe 4 is a high temperature resistant heat dissipation pipe. The heat dissipation pipe 4 is a high temperature resistant heat dissipation pipe, and a high temperature resistant heat dissipation pipe is added between the cable core center and the wire core. The heat dissipation pipe 4 separates the wire cores to prevent the wire cores from squeezing each other, thereby increasing the service life of the wire cores. When the cable core generates heat during long-term operation, the heat dissipation pipe 4 can be connected to the exhaust device, so that the heat inside the cable can be quickly discharged without accumulating heat inside the cable core, thereby improving the high temperature resistance of the cable core, improving the heat exchange capacity, and thus improving the current carrying capacity of the cable.

[0027] Specifically, the wrapping tape 5 is a low-smoke halogen-free high flame retardant tape that is overlapped and wrapped. The wrapping tape 5 is a low-smoke halogen-free high flame retardant tape that is overlapped and wrapped. It can absorb a lot of heat energy during the combustion process, and form a carbon shell layer to isolate the air, hindering further combustion of the cable, and effectively playing the role of fire and oxygen isolation.

[0028] Specifically, the fireproof shielding layer 6 is made of copper strip embossing longitudinally wrapped by argon arc welding. The fireproof shielding layer 6 is welded by copper strip, and the metal fireproof layer and the shielding layer are combined into one. The copper strip embossing longitudinally wrapped by argon arc welding can effectively prevent the burning of external flames, that is, it can ensure its fire resistance, and it is a full shielding structure without losing its shielding effect, so as to realize its signal transmission, which is more obvious in the occasion of medium and high frequency signals.

[0029] Specifically, the heat insulation layer 7 is a ceramic polyolefin fireproof sheath. The heat insulation layer 7 is a ceramic polyolefin fireproof sheath material, which has excellent flame retardant properties, is halogen-free, more environmentally friendly, and effectively protects the shielding layer from damage. It can generate a hard ceramic-like hard shell under flame burning or high temperature conditions. The hard shell does not melt or drip, can resist water spray and mechanical vibration, and has very good heat insulation and fireproof effects, which can ensure the smooth flow of power and information control in the event of a fire, and buy precious time for personnel escape and fire rescue.

[0030] Specifically, the outer protective layer 8 is PTFE Teflon polytetrafluoroethylene plastic. The outer protective layer 8 is PTFE Teflon polytetrafluoroethylene plastic, which makes the cable high temperature resistance level reach 250 degrees and low temperature resistance -60 degrees, and has excellent cold resistance, high temperature resistance, corrosion resistance, weather resistance, acid and alkali resistance, environmental protection and other characteristics.

[0031] The utility model adds a heat dissipation pipe between the center of the cable core and the wire core, and separates each wire core through the heat dissipation pipe, which can prevent the wire cores from being squeezed against each other and increase the service life of the wire core; and when the cable core generates heat when working for a long time, an exhaust device can be connected to the heat dissipation pipe, so that the heat inside the cable can be quickly discharged, and the heat will not be accumulated inside the cable core, thereby improving the high temperature resistance and heat exchange capacity of the cable core, thereby improving the current carrying capacity of the cable; at the same time, the insulation layer and the outer sheath material are made of high temperature resistant material, and a heat insulation layer and a fireproof layer are added, so that the high temperature resistance level of the cable reaches 250 degrees, and it has a high-efficiency fire retardant effect.

[0032] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A high temperature resistant low voltage cable, comprising a cable core and a sheath for wrapping the cable core, characterized in that: The cable core includes a plurality of wire cores and a plurality of heat dissipation tubes, and heat dissipation tubes are arranged between the wire cores; the structure of the wire core is provided with a conductor, a first insulating layer, and a second insulating layer in sequence from the inside to the outside, and the sheath is provided with a wrapping tape, a fireproof shielding layer, a heat insulation layer, and an outer protective layer in sequence from the inside to the outside.

2. A high temperature resistant low voltage cable according to claim 1, characterized in that: The cable core includes three wire cores and four heat dissipation tubes. A heat dissipation tube is arranged at the center of the cable core, and the other three wire cores and the three heat dissipation tubes are symmetrically arranged around the heat dissipation tube at the center position. The wire cores and heat dissipation tubes in the outer circle are arranged at intervals around the heat dissipation tube at the center position of the cable core.

3. A high temperature resistant low voltage cable according to claim 1, characterized in that: The conductor is a fifth type soft copper conductor.

4. A high temperature resistant low voltage cable according to claim 1, characterized in that: The conductors are twisted in a concentric and unidirectional bundled and multiple-twisted manner.

5. The high temperature resistant low voltage cable according to claim 1, characterized in that: The first insulating layer is a calcined mica tape, which is wrapped around the conductor in three overlapping layers, with an overlapping rate of 30%-40% for each layer; the second insulating layer is a high temperature resistant silicone rubber.

6. A high temperature resistant low voltage cable according to claim 1, characterized in that: The heat dissipation pipe is a high temperature resistant heat dissipation pipe.

7. The high temperature resistant low voltage cable according to claim 1, characterized in that: The wrapping tape is a low-smoke, halogen-free and highly flame-retardant tape that is wrapped in an overlapping manner.

8. The high temperature resistant low voltage cable according to claim 1, characterized in that: The fireproof shielding layer is made of copper strip embossed longitudinally wrapped by argon arc welding.

9. The high temperature resistant low voltage cable according to claim 1, characterized in that: The heat insulation layer is a ceramicized polyolefin fireproof sheath.

10. The high temperature resistant low voltage cable according to claim 1, characterized in that: The outer protective layer is PTFE Teflon polytetrafluoroethylene plastic.

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