CN109994275B

CN109994275B - Low-smoke halogen-free cable convenient to overhaul

Info

Publication number: CN109994275B
Application number: CN201910234328.2A
Authority: CN
Inventors: 魏月林
Original assignee: Beijing Tianhua Weiye Wire And Cable Co ltd
Current assignee: Beijing Tianhua Weiye Wire And Cable Co ltd
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-08-07
Anticipated expiration: 2039-03-26
Also published as: CN109994275A

Abstract

The invention relates to a low-smoke halogen-free cable convenient for maintenance, which comprises a conductor, an insulating layer sleeved outside the conductor and a protective layer arranged outside the insulating layer, the protective layer comprises a first protective sleeve sleeved outside the insulating layer and a second protective sleeve sleeved outside the first protective sleeve, the first protective sleeve is a fluorescent tube, a plurality of negative pressure tubes are arranged on the negative pressure tubes, the negative pressure tube is internally provided with an air pressure sensor, the fluorescent tube is uniformly provided with a plurality of coils which are closed loops and are electrically connected with the negative pressure tube along the length direction of the fluorescent tube, the coil is connected with a light emitting diode which is coupled with the air pressure sensor in series, and the fluorescent tube is provided with a plurality of capillary tubes communicated with the adjacent negative pressure tubes, and the inner side wall of the second protective sleeve is tightly attached to the outer side wall of the first protective sleeve. The invention has the effect of conveniently overhauling the cable.

Description

Low-smoke halogen-free cable convenient to overhaul

Technical Field

The invention relates to the technical field of low-smoke halogen-free cables, in particular to a low-smoke halogen-free cable convenient to overhaul.

Background

The low-smoke halogen-free wire sheath is composed of thermoplastic or thermosetting materials which are low in smoke discharge amount when heated and do not contain halogen.

The low-smoke halogen-free material can reduce toxic and corrosive gases generated during combustion. In environments with poor ventilation, such as airplanes, train cars, or ships, low smoke, zero halogen materials are often used. Low smoke zero halogen materials are also commonly used in the railway industry because there will be high voltage lines or signal lines that carry train locations under the railway. The low-smoke halogen-free material is used for reducing the accumulated toxic gas when the line is damaged due to fire or short circuit.

In the prior art, a referenced chinese patent with an authorization publication number of CN105976914B discloses a low-smoke halogen-free flame-retardant cable, which includes a wire core, a filling layer wrapping the wire core, a wrapping layer wrapping the filling layer, an inner sheath extruded outside the wrapping layer, an aluminum sheath extruded outside the inner sheath, and an outer sheath extruded outside the aluminum sheath; the cable core is wrapped by the conductor around the package shielding layer outside the conductor, and the extruded package is in around the insulating layer outside the package shielding layer, around the package in the shielding layer outside the insulating layer constitutes.

The above prior art solutions have the following drawbacks: through adopting neotype rubber materials in order to improve the good fire-resistant flame retardant property of cable among the prior art, and present low smoke and zero halogen cable is at the in-process that uses, if its outside protective layer breaks, can lead to unable insulating layer to the conductor outside to protect, it is possible that the insulating layer of this department can take place to damage in the use like this, and lead to this department electric leakage and take place dangerously, and the length of general cable is longer, it wastes time and energy to the inspection of the protective layer in the cable outside, so how more swift crack to the cable inspect just be a problem that needs to solve.

Disclosure of Invention

The invention aims to provide a low-smoke halogen-free cable which is convenient to overhaul.

The above object of the present invention is achieved by the following technical solutions:

a low-smoke halogen-free cable convenient for maintenance comprises a conductor, an insulating layer sleeved outside the conductor and a protective layer arranged outside the insulating layer, the protective layer comprises a first protective sleeve sleeved outside the insulating layer and a second protective sleeve sleeved outside the first protective sleeve, the first protective sleeve is a fluorescent tube, a plurality of negative pressure tubes are arranged on the fluorescent tube, an air pressure sensor is arranged in each negative pressure tube, the pressure sensor is provided with a measuring circuit which outputs high level signals when the air pressure is increased, the fluorescent tube is uniformly provided with a plurality of coils which are closed loops and are electrically connected with the negative pressure tube along the length direction of the fluorescent tube, the coil is connected with a light emitting diode which is coupled with the air pressure sensor in series, and the fluorescent tube is provided with a plurality of capillary tubes communicated with the adjacent negative pressure tubes, and the inner side wall of the second protective sleeve is tightly attached to the outer side wall of the first protective sleeve.

Through adopting above-mentioned technical scheme, the electricity allies oneself with the in-process of using, when the cable circular telegram, the coil produces self-inductance current under the effect of conductor, if outer second protective sheath is because wearing and tearing, the collision, when fish tail etc. produced the gap, can lead to first protective sheath to be located the capillary tube contact external air of gap department, the air enters into in the adjacent negative-pressure pipe through a plurality of capillaries, atmospheric pressure increase in the negative-pressure pipe like this, baroceptor senses the atmospheric pressure increase like this and exports high level signal behind the measuring circuit of self, emitting diode gets to the electricity and begins to give out light, thereby the staff can more conveniently find cracked position according to luminous position and repair the crack, it is more convenient.

The invention is further configured to: the conductor is total a plurality of, the insulating layer is including the first insulating cover of respectively the cover locating on a plurality of conductors and the second insulating cover of a plurality of first insulating cover outsides is located to the cover, first insulating cover is insulating polyethylene low smoke and zero halogen cable.

Through adopting above-mentioned technical scheme, establish first insulating cover and second insulating cover through the conductor overcoat and improve the insulating degree of conductor, first insulating cover is made by low cigarette polyethylene material in order to guarantee that the cable can not produce smog and harmful gas when burning because of the short circuit, environmental protection more.

The invention is further configured to: and a heat-insulating flame-retardant sheath is sleeved on the outer side of each first insulating sleeve.

Through adopting above-mentioned technical scheme, through set up thermal-insulated fire-retardant band in order to prevent the inboard burning of cable in the outside of first insulating boot.

The invention is further configured to: and both sides of the negative pressure pipe are in a wave shape expanding from the middle part to both sides of the negative pressure pipe.

By adopting the technical scheme, the negative pressure pipe is designed into a wave shape so as to improve the sealing property of the negative pressure pipe and prevent the outside air from directly entering the inner side of the negative pressure pipe.

The invention is further configured to: the coils are spirally distributed in the fluorescent tube.

By adopting the technical scheme, the number of turns of the coil is increased by designing the coil into a wave shape, and the current intensity of the coil is increased.

The invention is further configured to: the second insulating sleeve is made of a radiation cross-linked polyolefin material.

By adopting the technical scheme, the conductor is further insulated by adopting the irradiation crosslinking polyolefin material, the strength of the cable is improved by the crosslinking polyolefin material, the environmental protection performance is good, and after the cable is manufactured by the irradiation process, the tensile property of the cable is higher and more stable.

The invention is further configured to: the second protective sheath is made by transparent PVC material.

Through adopting above-mentioned technical scheme, through making transparent material with the second protective sheath, when appearing the gap on the lateral wall of second protective sheath like this, emitting diode's the department of illuminating is more obvious, and it is more convenient when looking for the staff.

The invention is further configured to: and a low-smoke halogen-free flame-retardant polyolefin filler is filled between the second insulating sleeve and the first insulating sleeve.

Through adopting above-mentioned technical scheme, fix the position of conductor through setting up the stopping between second insulating cover and first insulating cover, prevent that a plurality of conductors from twisting together to the stopping prevents that the cable from burning for fire-retardant material.

In conclusion, the beneficial technical effects of the invention are as follows:

1. according to the invention, the fluorescent tube is arranged on the outer side of the insulating layer, the plurality of coils are arranged in the fluorescent tube, the negative pressure tube is arranged on the fluorescent tube, the air pressure sensor connected with the coils is arranged in the negative pressure tube, the air pressure sensor is connected with the light emitting diode in series, when the second protective sleeve cracks, the air pressure change can be generated at the position and the light emitting diode can be lightened, and a worker can conveniently find the position and overhaul the position;

2. the first insulating sleeve and the second insulating sleeve are arranged to enhance the insulating property of the conductor, and the first insulating sleeve is a low-smoke halogen-free cable to ensure that the cable does not generate smoke and harmful gas during combustion, so that the cable is more environment-friendly;

3. the negative pressure pipe is arranged in a wave shape to improve the sealing performance of the negative pressure pipe and prevent outside air from directly entering the inner side of the negative pressure pipe.

Drawings

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

Fig. 2 is a schematic cross-sectional view of a cable according to the invention.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic view of the cable of the present invention without a second protective sheath.

FIG. 5 is a schematic view of the structure of the protective stripping layer and the second insulating sleeve of the present invention.

In the figure, 1, a conductor; 2. an insulating layer; 21. a first insulating sleeve; 22. a second insulating sleeve; 23. a heat-insulating flame-retardant sheath; 3. a protective layer; 31. a first protective sheath; 311. a negative pressure tube; 312. a coil; 313. an air pressure sensor; 314. a light emitting diode; 32. a second protective sheath.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the invention discloses a low smoke zero halogen cable convenient for maintenance, which comprises a conductor 1, an insulating layer 2 and a protective layer 3. The conductor 1 is total three and set up side by side, and insulating layer 2 includes three first insulating cover 21 and a second insulating cover 22, and first insulating cover 21 and second insulating cover 22 are low smoke and zero halogen cable, and three first insulating cover 21 is established respectively on three conductor 1, and first insulating cover 21 is made by insulating polyethylene low smoke and zero halogen material, and the outside cover of first insulating cover 21 is equipped with thermal-insulated fire-retardant canning piece 23.

Through establish first insulating cover 21 and second insulating cover 22 at conductor 1 overcoat and improve conductor 1's insulating degree, first insulating cover 21 is made by low smoke polyethylene material and can not produce smog, environmental protection more when guaranteeing that the cable burns because of the short circuit. The inner side of the cable is prevented from burning by providing a heat-insulating flame-retardant wrapping tape on the outer side of the first insulating sheath 21.

The second insulating sleeve 22 is sleeved outside the three heat-insulating flame-retardant sheaths 23, the second insulating sleeve 22 is made of irradiation cross-linked polyolefin material, and the irradiation cross-linked polyolefin material has good strength and tensile property, does not contain halogen, does not generate toxic gas during combustion, and is more environment-friendly. The low-smoke halogen-free flame-retardant polyolefin filler is filled between the second insulating sleeve 22 and the three heat-insulating flame-retardant sheath 23, so that the position of the conductor 1 is fixed, the plurality of conductors 1 are prevented from being twisted together, the filler is made of a flame-retardant material to prevent cable combustion, and the filler is made of a low-smoke halogen-free material and is more environment-friendly.

As shown in fig. 2 and 3, the protection layer 3 includes a first protection cover 31 and a second protection cover 32, the first protection cover 31 is sleeved on the second insulation cover 22, the second protection cover 32 is sleeved on the first protection cover 31, and the inner side of the second protection cover is tightly attached to the outer side wall of the first protection cover 31, the first protection cover 31 is a fluorescent tube, the fluorescent tube is made of a transparent material and is filled with a pigment, and the pigment can be in a color with a prominent color such as red, green, yellow, etc.

With reference to fig. 4, a plurality of rows of negative pressure tubes 311 are disposed on the outer side wall of the first protection cover 31, the plurality of rows of negative pressure tubes 311 are uniformly distributed along the outer circumferential surface of the first protection cover 31, each row of negative pressure tubes 311 is provided with a plurality of negative pressure tubes and is uniformly distributed along the length direction of the first protection cover 31, the negative pressure tubes 311 are radially disposed along the first protection cover 31, and two side edges of the negative pressure tubes 311 are both in a wave shape expanding from the middle of the negative pressure tubes 311 to two sides.

As shown in fig. 3 and 5, a plurality of coils 312 are disposed inside the first protective sleeve 31, the coils 312 are uniformly distributed along the length direction of the first protective sleeve 31, the coils 312 are spirally and coaxially disposed with the first protective sleeve 31, and are connected end to end, a light emitting diode 314 is connected to each coil 312 in series, an air pressure sensor 313 is disposed at the bottom of each negative pressure tube 311, the air pressure sensor 313 is coupled to the light emitting diode 314 in series, a plurality of capillaries are disposed on the fluorescent tube, and each capillary is communicated with the adjacent negative pressure tube 311.

When the cable is used, when the cable is electrified, the coil 312 generates self-induced current under the action of the conductor 1, if the outer second protection layer 3 generates gaps due to abrasion, collision, scratch and the like, the capillary tubes of the first protection layer 3 at the gaps can be caused to contact with the outside air, the air enters the adjacent negative pressure tube 311 through the capillary tubes, so that the air pressure in the negative pressure tube 311 is increased, the air pressure sensor 313 outputs a high-level signal after sensing the increased air pressure through a measuring circuit of the air pressure sensor 313, the light-emitting diode 314 is electrified and starts to emit light, and a worker can conveniently find the position of the gap according to the light-emitting position so as to repair the gap, and the method is more convenient.

The negative pressure tube 311 is formed in a wave shape to improve the sealing performance of the negative pressure tube 311, and prevent outside air from directly entering the inside of the negative pressure tube 311. The current strength of the coil 312 is increased by designing the coil 312 in a wave shape to increase the number of turns of the coil 312.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a convenient low smoke and zero halogen cable who overhauls, includes conductor (1), the insulating layer (2) of locating the conductor (1) outside and locates protective layer (3) in the insulating layer (2) outside, its characterized in that: the protective layer (3) comprises a first protective sleeve (31) sleeved outside the insulating layer (2) and a second protective sleeve (32) sleeved outside the first protective sleeve (31), the first protective sleeve (31) is a fluorescent tube, a plurality of negative pressure tubes (311) are arranged on the fluorescent tube, an air pressure sensor (313) is arranged in the negative pressure tube (311), a measuring circuit for outputting a high level signal when the air pressure is increased is arranged on the air pressure sensor (313), a plurality of coils (312) which are closed loops and are electrically connected with the negative pressure tube (311) are uniformly distributed on the fluorescent tube along the length direction of the fluorescent tube, a light emitting diode (314) is connected to the coil (312), the light emitting diode (314) is coupled in series with a barometric pressure sensor (313), the fluorescent tube is provided with a plurality of capillary tubes communicated with the adjacent negative pressure tubes (311), the inner side wall of the second protective sleeve (32) is tightly attached to the outer side wall of the first protective sleeve (31).

2. The low smoke zero halogen cable convenient for overhaul according to claim 1, which is characterized in that: the conductor (1) is a plurality of in total, insulating layer (2) are located the first insulating cover (21) in a plurality of conductors (1) and are located the second insulating cover (22) in a plurality of first insulating cover (21) outsides including the cover respectively, first insulating cover (21) are insulating polyethylene low smoke and zero halogen cable.

3. The low smoke zero halogen cable convenient for overhaul according to claim 2, which is characterized in that: the outer side of each first insulating sleeve (21) is sleeved with a heat-insulating flame-retardant sheath (23).

4. The low smoke zero halogen cable convenient for overhaul according to claim 1, which is characterized in that: and both side edges of the negative pressure pipe (311) are in a wave shape expanding from the middle part of the negative pressure pipe (311) to both sides.

5. The low smoke zero halogen cable convenient for overhaul according to claim 1, which is characterized in that: the coils (312) are distributed helically within the fluorescent tube.

6. The low smoke zero halogen cable convenient for overhaul according to claim 2, which is characterized in that: the second insulating sleeve (22) is made of a radiation cross-linked polyolefin material.

7. The low smoke zero halogen cable convenient for overhaul according to claim 1, which is characterized in that: the second protective sleeve (32) is made of transparent PVC materials.

8. The low smoke zero halogen cable convenient for overhaul according to claim 2, which is characterized in that: and a low-smoke halogen-free flame-retardant polyolefin filler is filled between the second insulating sleeve (22) and the first insulating sleeve (21).