CN210073420U

CN210073420U - Fire-resistant cable

Info

Publication number: CN210073420U
Application number: CN201920006346.0U
Authority: CN
Inventors: 曾昭龙
Original assignee: Guangdong Yuelan Cable & Wire Co Ltd
Current assignee: Guangdong Yuelan Cable & Wire Co Ltd
Priority date: 2019-01-03
Filing date: 2019-01-03
Publication date: 2020-02-14
Anticipated expiration: 2029-01-03

Abstract

The utility model discloses a fire-resistant cable, including conductor, around band, first fire-retardant layer, second fire-retardant layer and oversheath, first inert gas chamber has evenly been seted up to first fire-retardant layer inside, first fire-retardant layer outer wall evenly is seted up and is run through the first gas vent in first inert gas chamber, first fire-retardant layer outer wall has cup jointed the second fire-retardant layer, second inert gas chamber has evenly been seted up to second fire-retardant layer inside, second fire-retardant layer outer wall evenly is seted up and is run through the second gas vent in second inert gas chamber, and this fire-resistant cable burns the oversheath in open fire, and the nitrogen gas in the first inert gas chamber goes out from first gas vent to play the effect of putting out a fire, and after open fire burnt first fire-retardant layer, the nitrogen gas in the second inert gas chamber is released from the second gas vent to play the effect of putting out a fire, the cable is prevented from being burnt by open fire through nitrogen twice, so that the fire resistance of the cable is improved.

Description

Fire-resistant cable

Technical Field

The utility model relates to a fire resisting cable technical field specifically is a fire resisting cable.

Background

The fire-resistant cable is a cable capable of keeping safe operation for a certain time under the condition of flame combustion, and comprises a low-cost halogen-free fire-resistant cable, a polyvinyl chloride fire-resistant cable and the like, the fire-resistant test is divided into A, B levels according to national standard GB12666.6 (such as IEC331) in China, the A-level flame temperature is 950-1000 ℃, the sustained fire supply time is 90min, the B-level flame temperature is 750-800 ℃, the sustained fire supply time is 90min, a sample is required to bear a rated voltage value specified by a product during the whole test period, and the fire-resistant cable is widely applied to places related to fire safety and fire rescue, such as high-rise buildings, underground railways, underground streets, large power stations, important industrial and mining enterprises, for example, power supply lines and control lines of emergency facilities such as fire-fighting equipment.

When an existing fire-resistant cable encounters open fire, the flame-retardant layer of the cable is also made of a combustible material, the flame-retardant layer on the outer side of the cable is slowly burnt by the open fire, and then a conductor in the cable is exposed, so that electric leakage of the cable is caused, and further spreading of fire is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire resisting cable to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a fire-resistant cable, includes the conductor, around the band, first fire-retardant layer, the fire-retardant layer of second and oversheath, it has three conductor to evenly peg graft around the inside of band, the insulating layer has been wrapped up to the conductor outer wall, the packing has the filling layer around packing between insulating layer and the band, around the band outer wall cup jointed first fire-retardant layer, first inert gas chamber has evenly been seted up to first fire-retardant in situ inside, first fire-retardant layer outer wall evenly sets up the first air guide hole that runs through first inert gas chamber, the fire-retardant layer outer wall of first fire-retardant layer has cup jointed the fire-retardant layer of second, the fire-retardant in situ portion of second has evenly set up second inert gas chamber, the fire-retardant layer outer wall of second evenly sets up the second air guide hole that runs through second inert gas chamber, the fire-retardant layer.

Preferably, the first inert gas chamber and the second inert gas chamber are both filled with nitrogen.

Preferably, the first flame-retardant layer and the second flame-retardant layer are both made of silicon rubber materials.

Preferably, the outer sheath is made of a heat-resistant and wear-resistant silica gel glass fiber sleeve.

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

the utility model discloses a set up first fire-retardant layer and the fire-retardant layer of second between the overcoat and around the band, thereby the fire resistance of cable has been increased, when the conflagration takes place around the cable, after the oversheath burns at naked light, the nitrogen gas of first inert gas intracavity portion is released away from first air guide hole, thereby play the effect of putting out a fire, after the naked light burns first fire-retardant layer, the nitrogen gas of second inert gas intracavity portion releases from the second air guide hole, thereby play the effect of putting out a fire, through twice nitrogen gas separation naked light burning cable, thereby the fire resistance of cable has been improved.

Drawings

Fig. 1 is a schematic view of the main sectional structure of the present invention.

In the figure: 10. a conductor; 11. an insulating layer; 12. a filling layer; 13. wrapping a tape; 20. a first flame retardant layer; 21. a first inert gas chamber; 22. a first air guide hole; 30. a second flame retardant layer; 31. a second inert gas chamber; 32. a second air guide hole; 40. an outer sheath.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a fire-resistant cable comprises a conductor 10, a wrapping tape 13, a first flame-retardant layer 20, a second flame-retardant layer 30 and an outer sheath 40, three conductors 10 are uniformly inserted into the wrapping tape 13, the outer wall of each conductor 10 is wrapped by an insulating layer 11, a filling layer 12 is filled between the insulating layer 11 and the wrapping tape 13, a first flame-retardant layer 20 is sleeved on the outer wall of the wrapping tape 13, the first flame retardant layer 20 is uniformly provided with a first inert gas cavity 21 inside, the outer wall of the first flame retardant layer 20 is uniformly provided with a first gas guide hole 22 penetrating through the first inert gas cavity 21, the outer wall of the first flame-retardant layer 20 is sleeved with a second flame-retardant layer 30, a second inert gas cavity 31 is uniformly arranged inside the second flame-retardant layer 30, the outer wall of the second flame-retardant layer 30 is uniformly provided with second air guide holes 32 penetrating through the second inert gas cavity 31, and the outer wall of the second flame-retardant layer 30 is sleeved with an outer sheath 40.

Wherein, the first inert gas cavity 21 and the second inert gas cavity 31 are both filled with nitrogen, and because nitrogen belongs to inert gas and has the characteristic of not supporting combustion, the nitrogen can play a role in extinguishing fire.

The first flame-retardant layer 20 and the second flame-retardant layer 30 are made of silicon rubber materials, and the silicon rubber materials have good electrical insulation, high temperature resistance, oxidation resistance, aging resistance, light resistance, mildew resistance and chemical stability, so that the service lives of the first flame-retardant layer 20 and the second flame-retardant layer 30 are prolonged.

The outer sheath 40 is made of a heat-resistant and wear-resistant silica gel glass fiber sleeve, and the heat-resistant and wear-resistant silica gel glass fiber sleeve has the advantages of being good in high temperature resistance, wear-resistant and the like, so that the service life of the outer sheath 40 is prolonged.

The working principle is as follows: when using, set up first fire-retardant layer 20 and the fire-retardant layer 30 of second between overcoat 40 and around band 13, protect the cable inside through first fire-retardant layer 20 and the fire-retardant layer 30 of second, thereby the fire resistance of cable has been increased, when the conflagration takes place around the cable, after the overcoat 40 burns at open fire, the inside nitrogen gas in first inert gas chamber 21 is released from first air guide hole 22, thereby play the effect of putting out a fire, burn the back with first fire-retardant layer 20 at open fire, the inside nitrogen gas in second inert gas chamber 31 is released from second air guide hole 32, thereby play the effect of putting out a fire, burn the cable through twice nitrogen gas separation open fire, thereby the fire resistance of cable has been improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a fire-resistant cable, includes conductor (10), around band (13), first fire-retardant layer (20), fire-retardant layer of second (30) and oversheath (40), its characterized in that: three conductors (10) are uniformly inserted into the wrapping tape (13), the outer wall of each conductor (10) is wrapped with an insulating layer (11), a filling layer (12) is filled between the insulating layer (11) and the wrapping tape (13), a first flame-retardant layer (20) is sleeved on the outer wall of the wrapping tape (13), first inert gas cavities (21) are uniformly formed in the first flame-retardant layer (20), the outer wall of the first flame-retardant layer (20) is uniformly provided with first air vents (22) penetrating through the first inert gas cavity (21), a second flame-retardant layer (30) is sleeved on the outer wall of the first flame-retardant layer (20), a second inert gas cavity (31) is uniformly formed in the second flame-retardant layer (30), and the outer wall of the second flame-retardant layer (30) is uniformly provided with second air guide holes (32) penetrating through the second inert gas cavity (31), and the outer wall of the second flame-retardant layer (30) is sleeved with an outer sheath (40).

2. The fire resistant cable of claim 1, wherein: and nitrogen is filled in the first inert gas cavity (21) and the second inert gas cavity (31).

3. The fire resistant cable of claim 1, wherein: the first flame-retardant layer (20) and the second flame-retardant layer (30) are both made of silicon rubber materials.

4. The fire resistant cable of claim 1, wherein: the outer sheath (40) is made of a heat-resistant wear-resistant silica gel glass fiber sleeve.