CN115954152B

CN115954152B - Fireproof cable

Info

Publication number: CN115954152B
Application number: CN202310046045.1A
Authority: CN
Inventors: 曹永超; 高楼; 李晓昭; 高梦飞
Original assignee: Hebei Fangke Cable Co ltd
Current assignee: Hebei Fangke Cable Co ltd
Priority date: 2023-01-30
Filing date: 2023-01-30
Publication date: 2023-05-09
Anticipated expiration: 2043-01-30
Also published as: CN115954152A

Abstract

The invention provides a fireproof cable, and relates to the technical field of cables; the cable comprises a cable core and a protection unit coated on the outer side of the cable core; the protection unit is provided with a plurality of blocking units, and the blocking units are arranged at intervals along the length direction of the cable core; each blocking unit comprises a fixed sleeve fixedly sleeved on the protective unit and blocking pieces respectively arranged at two ends of the fixed sleeve; the blocking piece comprises a plurality of baffles, one end of each baffle is hinged with the fixed sleeve, and a driving unit is arranged between each baffle and the fixed sleeve; one of the two adjacent baffles is provided with a socket part, and the other baffle is provided with an inserting part; the plug-in mounting part can be inserted into the corresponding socket and spigot part, so that each baffle plate is enclosed into a cylinder shape which is held on the protection unit, and after the protection unit is heated, the plug-in mounting part is driven by the driving unit and can be separated from the corresponding socket and spigot part, so that each baffle plate is opened into an umbrella shape. The fireproof cable can better prevent the spread of fire on the fireproof cable.

Description

Fireproof cable

Technical Field

The invention relates to the technical field of cables, in particular to a fireproof cable.

Background

A cable is a device for power or signal transmission, and generally includes a conductive cable core and an insulating layer coated on the outside of the cable core.

In order to reduce the occurrence of the above problems, the existing fireproof cable is generally made of an insulating layer material of the cable, however, the insulating layer containing the flame retardant has limited flame retardant effect, and the fire may spread when the fire exists for a long time. In order to solve the problems, a structure for preventing fire spreading or actively extinguishing fire is also arranged on the cable in the prior art; for example, the chinese patent application No. 2019109999004 provides a fire-proof hanging cable, which falls down actively by a fire-proof ring sleeved on the cable main body when the cable burns, so as to quickly extinguish the flame on the cable outer coating in a friction manner with the cable main body through the inner wall of the fire-proof ring, and the defect is that: on the one hand, because the fireproof ring protrudes out of the cable main body, the installation difficulty of the cable is increased, on the other hand, the fireproof ring has shorter fire extinguishing time, and after the fireproof ring falls down, the cable main body still has the possibility of reburning.

Also for example, chinese patent application No. 201910764191.1 provides a composite fire-resistant cable in which an air storage chamber is formed in the cable and filled with inert gas to rapidly extinguish a fire by the continuously flushed inert gas after the cable burns; the defects are that: the size of the burned notch on the cable is uncertain after the cable burns, and when the notch is large, inert gas can be quickly dissipated, and after the inert gas is completely dissipated, the cable can still be reburning.

In summary, the structure of the existing cable that prevents the spread of fire and actively extinguishes the fire is less effective.

Disclosure of Invention

Therefore, the invention provides a fireproof cable which has a good fireproof effect.

The technical scheme of the invention is as follows:

the fireproof cable comprises a cable core and protection units coated on the outer side of the cable core, wherein a plurality of blocking units are arranged on the protection units, and the blocking units are arranged at intervals along the length direction of the cable core; each blocking unit comprises a fixed sleeve sleeved on the protective unit and blocking pieces respectively arranged at two ends of the fixed sleeve, each blocking piece comprises a plurality of baffles, one end of each baffle is respectively hinged with the fixed sleeve, and a driving unit is arranged between each baffle and the fixed sleeve;

one of the two adjacent baffles is provided with a socket part, and the other baffle is provided with a plug part; the inserting and mounting parts can be inserted into the adjacent socket and spigot parts, so that each baffle plate is enclosed into a cylinder shape which is held on the protection unit, and after the protection unit is heated, the protection unit is driven by the driving unit, and the inserting and mounting parts can be separated from the adjacent socket and spigot parts, so that each baffle plate is unfolded into an umbrella shape.

Further, the protection unit comprises a first protection layer coated on the outer side of the cable core, a plurality of supporting pieces arranged on the outer side of the first protection layer at intervals along the length direction of the cable core, and a second protection layer arranged on each supporting piece, wherein a gap is arranged between the first protection layer and the second protection layer.

Further, the support member includes two separators arranged at intervals along the length direction of the cable core; and a first cavity for storing fire extinguishing gas is enclosed between the two adjacent partition plates, the first protective layer and the second protective layer in the two adjacent supporting pieces.

Further, each partition board is provided with a first exhaust hole, and each first exhaust hole is internally provided with a first sealing plug; each blocking unit is arranged corresponding to each supporting piece, the fixing sleeve is positioned between the two corresponding baffle plates of the supporting piece, and when the baffle plates are enclosed into a cylinder shape, the free ends of the baffle plates exceed the corresponding baffle plates.

Further, at least one second exhaust hole is respectively arranged on the fixed sleeve corresponding to the blocking pieces at the two ends of the fixed sleeve, a second rope body which is connected with the first blocking piece at the opposite side and passes through the second exhaust hole is arranged on at least one baffle plate of the blocking piece, and a second blocking piece capable of blocking the second exhaust hole is arranged on the second rope body;

when the baffle rotates from the position surrounding the cylinder to the position surrounding the umbrella, the second rope body can be pulled, so that the first sealing plug is separated from the first exhaust hole, and the second sealing plug is separated from the second exhaust hole.

Further, the first plugs on the two partition boards of the same supporting piece are connected through a first rope; the second rope body is connected with the first rope body.

Further, the first plugs on the supporting pieces are connected through third ropes, and the second ropes are respectively connected with the third ropes; when the baffle rotates from a position surrounding a cylinder to a position surrounding an umbrella, the second rope body has a first stroke for pulling the second sealing plug and not pulling the third rope body, and a second stroke for pulling the third rope body.

Further, a plurality of heat conducting wires which can be attached to the inner wall of the second protective layer are arranged between two adjacent partition plates in the two adjacent support pieces, and the heat conducting wires are arranged at intervals along the circumferential direction of the support pieces.

Further, the driving unit comprises a sliding sleeve which is slidably sleeved on the fixed sleeve, a traction rope which is respectively connected with the sliding sleeve and each baffle plate, and an elastic piece which supports the fixed sleeve; the elastic piece applies elastic force to the sliding sleeve to enable the sliding sleeve to be far away from the baffle.

Further, the baffle plates at two ends of the same fixed sleeve and the traction ropes between the corresponding sliding sleeves are arranged in a crossing mode, and the elastic piece is abutted between the two sliding sleeves.

The working principle and the beneficial effects of the invention are as follows:

according to the fireproof cable provided by the invention, each baffle can be switched between being enclosed into a cylinder shape which is held on the protection unit and being unfolded into an umbrella shape; when the baffles are enclosed into a cylinder, the influence on the outer diameter of the fireproof cable can be reduced, so that the fireproof cable is convenient to install and arrange; moreover, flame propagation delay occurs on the fireproof cable, and each baffle can be opened to be umbrella-shaped, so that each baffle has a larger flame-retarding area, and flame can be better prevented from continuing to spread.

Drawings

The invention will be described in further detail with reference to the drawings and the detailed description.

Fig. 1 is a perspective view of a fireproof cable provided by the invention;

fig. 2 is a cross-sectional view of a fire-resistant cable provided by the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

fig. 4 is a schematic view of an internal structure of a fireproof cable provided by the invention;

fig. 5 is a cross-sectional view of a fire-resistant cable provided by the present invention;

FIG. 6 is a partial enlarged view at B in FIG. 5;

fig. 7 is a schematic diagram of fig. 6 under another scheme.

In the figure:

100-cable cores;

200-protection units, 210-first protection layers, 220-second protection layers, 230-support pieces, 231-bodies, 232-partition boards, 233-first plugs, 240-first rope bodies, 250-third rope bodies, 201-first cavities and 202-first exhaust holes;

300-blocking units, 310-fixing sleeves, 320-blocking pieces, 321-baffle plates, 322-socket parts, 323-plug parts, 330-second ropes, 340-second plugs, 301-second cavities and 302-second exhaust holes;

400-a driving unit, 410-a sliding sleeve, 411-a first sliding sleeve, 412-a second sliding sleeve, 420-a traction rope, 430-an elastic piece;

500-heat conducting wire.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The embodiment provides a fireproof cable, referring to fig. 1 and 2, which comprises a cable core 100 and a protection unit 200 coated on the outer side of the cable core 100, wherein a plurality of blocking units 300 are arranged on the protection unit 200, and the blocking units 300 are arranged at intervals along the length direction of the cable core 100; each blocking unit 300 comprises a fixing sleeve 310 sleeved on the protection unit 200, and blocking pieces 320 respectively arranged at two ends of the fixing sleeve 310; the blocking member 320 includes a plurality of blocking plates 321, one end of each blocking plate 321 is hinged to the fixing sleeve 310, and a driving unit 400 is disposed between each blocking plate 321 and the fixing sleeve 310.

One of the two adjacent baffles 321 is provided with a socket part 322, and the other is provided with a plug part 323; the plug-in portion 323 can be inserted into the corresponding socket portion 322, so that each baffle 321 is enclosed into a cylinder shape embracing the protection unit 200, after the protection unit 200 is heated, the drive unit 400 drives the plug-in portion 323 to be separated from the corresponding socket portion 322, and each baffle 321 is opened into an umbrella shape.

Briefly, in the fireproof cable of the present embodiment, a plurality of blocking units 300 are disposed at intervals outside the protection unit 200. In a natural state, as shown on the right side of fig. 3, each of the shutters 321 of the barrier unit 300 is caught on the shielding unit 200, so that the barrier unit 300 can reduce the influence on the outer diameter of the fireproof cable to facilitate the installation and arrangement of the fireproof cable.

After the protection unit 200 is ignited and the fire spreads to the blocking unit 300, the blocking unit 300 can prevent the fire from spreading on the fire prevention unit because the blocking unit 300 is made of a nonflammable material such as metal; in addition, by enabling each of the baffles 321 to be opened in an umbrella shape as shown on the left side in fig. 3, the area for blocking the flame can be increased to avoid the flame from transmitting fire across the blocking unit 300; further, by opening each of the shutters 321 in an umbrella shape, the directional injection of the fire extinguishing gas described below is facilitated.

Referring to fig. 2 and 4, the protection unit 200 of the present embodiment includes a first protection layer 210 covering the outside of the cable core 100, a plurality of supporting members 230 disposed at intervals along the length direction of the cable core 100 outside the first protection layer 210, and a second protection layer 220 disposed on each supporting member 230, and a gap is provided between the first protection layer 210 and the second protection layer 220. The cable core 100 and the first protective layer 210 covering the outer side of the cable core 100 can refer to the existing cable, and the fireproof cable of the present embodiment is to add each supporting member 230 and the second protective layer 220 disposed on each supporting member 230.

Referring to fig. 4, the supporting member 230 of the present embodiment includes a body 231 having a fixing sleeve 310 provided on the first protective layer 210, and two spacers 232 provided on the outer circumference of the body 231 and spaced apart in the direction of the length of the cable core 100; a first chamber 201 for storing fire-extinguishing gas is enclosed between two adjacent separators 232, the first protection layer 210 and the second protection layer 220 in two adjacent supports 230.

Briefly, in the fireproof cable of the present embodiment, a first sealed cavity 201 is enclosed between two adjacent supporting members 230, a first protective layer 210 and a second protective layer 220, and a gas for extinguishing fire, for example, an inert gas or other gas capable of extinguishing fire, is stored in the first cavity 201.

Referring to fig. 4 to 6, in the present embodiment, first exhaust holes 202 are provided in each partition 232, and first plugs 233 are provided in each first exhaust hole 202. The blocking units 300 of the present embodiment are in one-to-one correspondence with the supporting members 230, wherein the fixing sleeve 310 is fixedly arranged between the two partition plates 232, and the fixing sleeve 310, the two partition plates 232 and the body 231 define a second cavity 301.

In this embodiment, the blocking members 320 at two ends of the fixing sleeve 310 have the same structure and operation principle, and the opening directions are different only when the fixing sleeve is opened into an umbrella shape, and one of the blocking members 320 will be described as an example in this embodiment. Referring to fig. 3, in this embodiment, each of the baffles 321 of the blocking member 320 is hinged to the fixed sleeve 310 at one end and is free at the other end. The structure of the hinge connection between the baffle 321 and the fixing sleeve 310 may refer to the prior art, and will not be described herein.

In this embodiment, a binding unit is disposed between the free end of each of the baffles 321 and the second protection layer 220, and the binding unit is used to bind the free end of each of the baffles 321 to the second protection layer 220, and the binding unit can fail after being heated, so that each of the baffles 321 can be opened under the driving of the driving unit 400 described below.

The binding unit of the present embodiment is a hot melt adhesive disposed between the barrier 321 and the second protection unit 200, which can adhere each barrier 321 to the second protection layer 220 at low temperature and can fail at high temperature, so that each barrier 321 can be opened. The binding unit of the present embodiment is not shown in the drawings since it does not affect understanding.

In some embodiments, the binding unit may be a rubber string bound to the outside of each barrier 321, and the rubber string may be broken when the temperature of each barrier 321 increases, so that each barrier 321 may be opened.

In order to facilitate understanding of the operation principle of each of the baffles 321 in the same barrier 320, referring to fig. 3, the baffles 321 provided with the socket portion 322 are referred to as first baffles, and the baffles 321 provided with the plug portion 323 are referred to as second baffles in this embodiment, and the first baffles and the second baffles are alternately arranged on the fixed sleeve 310.

Referring to fig. 3, the socket portion 322 of the present embodiment is a slot disposed on the lower side surface of the first baffle, the plug portion 323 is a plug board disposed on the side wall of the second baffle, and each plug board can be inserted into a corresponding slot, so that each baffle 321 can be enclosed into a cylindrical shape that is wrapped around the second protection layer 220 as shown in each baffle 321 on the right side of fig. 3; and after the restraint unit fails, the baffles 321 can be driven to rotate by the driving unit 400 described below, and each plugboard is separated from the corresponding slot, so that each baffle 321 is opened into an umbrella shape as shown by each baffle 321 on the left side in fig. 3.

Referring to fig. 3, the driving unit 400 of the present embodiment includes a sliding sleeve 410 slidably sleeved on the fixing sleeve 310, a traction rope 420 respectively connecting the sliding sleeve 410 and each of the baffles 321, and an elastic member 430 supporting the fixing sleeve 310, wherein the elastic member 430 applies an elastic force to the sliding sleeve 410 to keep the sliding sleeve 410 away from the baffles 321.

Referring to fig. 3, in this embodiment, the baffle plates 321 at two ends of the same fixing sleeve 310 are crossed with the traction ropes 420 between the corresponding sliding sleeves 410, and the elastic member 430 is abutted between the two sliding sleeves 410. For convenience of description, the sliding bush 410 coupled to the left-hand barrier 321 is referred to as a first sliding bush 411 in the direction shown in fig. 3; and the sliding sleeve 410 connected to the right-hand side barrier 321 is referred to as a second sliding sleeve 412. The aforementioned crossing arrangement of the traction ropes 420 means that the first sliding sleeve 411 is located between the right-hand blocking plate 321 and the second sliding sleeve 412, and the second sliding sleeve 412 is located between the left-hand blocking plate 321 and the first sliding sleeve 411.

In this embodiment, by arranging the driving unit 400 in the above manner, when the corresponding baffles 321 of the two sliding sleeves 410 are enclosed into a cylinder, the distance between the two sliding sleeves 410 is the shortest, and after the baffles 321 at any side are separated from the constraint of the constraint unit, the elastic member 430 can drive the corresponding sliding sleeves 410 to move; the same elastic member 430 drives the two sliding sleeves 410 to slide when needed, so that the structure of the protection unit 200 can be simplified, the assembly of the fireproof cable is facilitated, and the cost is reduced;

in some embodiments, a set of elastic members 430 may be disposed corresponding to the first sliding sleeve 411 and the second sliding sleeve 412, but the structure is more complex and the cost is higher than that of the solution of the present embodiment.

Referring to fig. 3, the elastic member 430 of the present embodiment is a spring disposed between the first sliding sleeve 411 and the second sliding sleeve 412.

In some embodiments, the elastic member 430 may be other elastic members such as a disc spring.

Referring to fig. 5 and 6, in the present embodiment, the blocking members 320 corresponding to two ends of the fixing sleeve 310 are respectively provided with a second air vent 302 on the fixing sleeve 310, a second rope 330 connected to the opposite first air vent 233 and passing through the second air vent 302 is provided on one baffle 321 of the two blocking members 320, and a second air vent 340 capable of blocking the second air vent 302 is provided on the second rope 330; after the baffle 321 rotates from the position surrounding the cylindrical shape to the position surrounding the umbrella shape, the second rope 330 can be pulled, so that the first blocking plug 233 is separated from the first exhaust hole 202, and the second blocking plug 340 is separated from the second exhaust hole 302.

In the present embodiment, referring to fig. 5 and 6, the first blocking plugs 233 on the two separators 232 of the same support 230 are connected via the first string 240; the second ropes 330 are connected to the first ropes 240, respectively. Through setting up this first rope body 240, the baffle 321 of this support 230 both sides can all be through pulling first rope body 240 when rotating to the first shutoff piece 233 of pulling both sides, through adopting this kind of mode to pull first shutoff piece 233, comparatively make things convenient for this fireproof cable's shaping.

In some embodiments, two first exhaust holes 202 may be respectively disposed on each partition 232, and two corresponding second exhaust holes 302 and first ropes 240 are disposed on two baffles 321 of the same blocking member 320, which has the same principle and is not described herein.

As shown in fig. 5 and 6, when the fire of the protection unit 200 on the left side of the blocking unit 300 propagates to the blocking unit 300, each of the baffles 321 on the left side of the blocking unit 300 is opened to drive the second exhaust holes 302 below and the two first exhaust holes 202 on the support 230 to open, so that the fire extinguishing gas in the first cavities 201 on both sides of the blocking unit 300 is exhausted through the second exhaust holes 302 and is blocked by each of the baffles 321 to blow to the left side, thereby preventing the fire of the protection unit 200 on the left side.

Compared with the existing fireproof cable storing fire extinguishing gas, on the one hand, in the fireproof cable of the embodiment, the direction of the fire extinguishing gas can be changed by arranging each baffle 321 which can be opened into an umbrella shape, so that the fire extinguishing gas can be better blown to the burning position. On the other hand, by providing a plurality of independent first chambers 201 on the fireproof cable, as shown in fig. 5, when the second protective layer 220 on the left side of the blocking unit 300 is broken, the fire extinguishing gas in the first chamber 201 on the left side leaks rapidly, and the fire extinguishing gas in the first chamber 201 on the right side can still play a role in extinguishing a fire.

In some embodiments, as shown in fig. 7, the first plugs 233 on the partition 232 of each support 230 may be connected via a third rope 250; each second rope 330 is connected to the third rope 250; when the shutter 321 rotates from the cylindrical position to the umbrella-shaped position, the second rope 330 has a first stroke in which the second plug 340 is pulled and the third rope 250 is not pulled, and a second stroke in which the third rope 250 is pulled.

Referring to fig. 7, in a natural state, a connection point of the second blocking plug 340 and the second rope 330, and a connection point of the second rope 330 and the third rope 250 have a linear distance therebetween smaller than a length of the second rope 330 therebetween, such that when the barrier 321 pulls the second rope 330, there is a first stroke in which the third rope 250 is not pulled after the second blocking plug 340 is pulled; the second string 330 continues to be pulled a distance before the third string 250 begins to be pulled. The second rope 330 shown in fig. 7 is in a position just to pull out the second plugs 340, and thereafter, when the shutter 321 continues to rotate, the second rope 330 is straightened, and then each of the first plugs 233 is pulled out.

By providing the second rope 330 in the above manner, it is possible to prevent the third rope 250 from receiving the reverse tension of the second rope 330 to the third rope 250 at the rest when the second rope 330 at a certain position pulls the third rope 250. That is, in the fireproof cable of the present embodiment, the third rope 250 can be pulled by any one of the second ropes 330 without being hindered by the other second ropes 330. In the case of the first rope 240, the two second ropes 330 connected to the first rope 240 are closer to each other, and thus the two second ropes 330 do not provide opposite tensile forces.

By connecting each first blocking plug 233 via the third rope 250 and connecting each second rope 330 with the third rope 250, after the baffle 321 connected with one of the second ropes 330 opens, each first cavity 201 can be communicated, thereby providing more fire extinguishing gas, further prolonging the fire extinguishing time and preventing afterburning.

Referring to fig. 4, in this embodiment, a plurality of heat conductive wires 500 capable of being attached to the inner wall of the second protective layer 220 are disposed between two adjacent separators 232 in two adjacent support members 230, and each heat conductive wire 500 is disposed at intervals along the circumferential direction of the support member 230.

By arranging the above-mentioned heat conductive wires 500, on one hand, the armor can be wrapped on each heat conductive wire 500, and the second protective layer 220 is extruded outside the armor, so that the second protective layer 220 is convenient to be formed; on the other hand, because the fireproof cable adopts the metal material capable of conducting heat rapidly, heat can be conducted to the support piece 230 rapidly to dissipate heat, so that the temperature of the fireproof cable is reduced, the probability of fire of the fireproof cable can be reduced, and the natural service life of the fireproof cable can be prolonged.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The fireproof cable comprises a cable core (100) and a protection unit (200) coated on the outer side of the cable core (100), and is characterized in that a plurality of blocking units (300) are arranged on the protection unit (200), and the blocking units (300) are arranged at intervals along the length direction of the cable core (100); each blocking unit (300) comprises a fixed sleeve (310) sleeved on the protective unit (200), and blocking pieces (320) respectively arranged at two ends of the fixed sleeve (310), each blocking piece (320) comprises a plurality of baffles (321), one end of each baffle (321) is hinged with the fixed sleeve (310), and a driving unit (400) is arranged between each baffle (321) and the fixed sleeve (310);

one of the two adjacent baffles (321) is provided with a socket part (322), and the other baffle is provided with an inserting part (323); the inserting and mounting part (323) can be inserted into the adjacent socket and spigot parts (322), so that each baffle plate (321) is enclosed into a cylinder shape which is held on the protection unit (200), after the temperature of the protection unit (200) rises, the driving unit (400) drives the inserting and mounting part (323) to be separated from the adjacent socket and spigot parts (322), and each baffle plate (321) is unfolded into an umbrella shape;

the protection unit (200) comprises a first protection layer (210) coated on the outer side of the cable core (100), a plurality of supporting pieces (230) arranged at intervals on the outer side of the first protection layer (210) along the length direction of the cable core (100), and a second protection layer (220) arranged on each supporting piece (230), wherein a gap is arranged between the first protection layer (210) and the second protection layer (220);

the support (230) comprises two baffles (232) arranged at intervals along the length direction of the cable core (100); a first cavity (201) for storing fire extinguishing gas is enclosed between two adjacent partition plates (232), the first protective layer (210) and the second protective layer (220) in two adjacent supporting pieces (230);

each partition board (232) is provided with a first exhaust hole (202), and each first exhaust hole (202) is respectively provided with a first sealing plug (233); each blocking unit (300) is arranged corresponding to each supporting piece (230), the fixing sleeve (310) is positioned between two corresponding baffle plates (232) of the supporting piece (230), and when the baffle plates (321) are enclosed into a cylinder shape, the free ends of the baffle plates (321) exceed the corresponding baffle plates (232) at the corresponding side;

the blocking pieces (320) corresponding to the two ends of the fixing sleeve (310), at least one second exhaust hole (302) is respectively arranged on the fixing sleeve (310), a second rope body (330) which is connected with the first blocking piece (233) at the opposite side and passes through the second exhaust hole (302) is arranged on at least one baffle (321) of the blocking piece (320), and a second blocking piece (340) which can block the second exhaust hole (302) is arranged on the second rope body (330);

when the baffle plate (321) rotates from a cylindrical surrounding position to an umbrella-shaped surrounding position, the second rope body (330) can be pulled, so that the first sealing plug (233) is separated from the first exhaust hole (202), and the second sealing plug (340) is separated from the second exhaust hole (302);

the first blocking plugs (233) on the supporting pieces (230) are connected through third rope bodies (250), and the second rope bodies (330) are respectively connected with the third rope bodies (250); when the baffle plate (321) rotates from a cylindrical position to an umbrella-shaped position, the second rope body (330) has a first stroke for pulling the second sealing plug (340) and not pulling the third rope body (250), and a second stroke for pulling the third rope body (250).

2. The fireproof cable according to claim 1, wherein a plurality of heat conducting wires (500) capable of being attached to the inner wall of the second protective layer (220) are arranged between two adjacent partition plates (232) in two adjacent supporting members (230), and each heat conducting wire (500) is arranged at intervals along the circumferential direction of the supporting member (230).

3. The fire protection cable according to claim 1 or 2, characterized in that the driving unit (400) comprises a sliding sleeve (410) slidably sleeved on the fixing sleeve (310), a traction rope (420) respectively connecting the sliding sleeve (410) and each baffle (321), and an elastic member (430) supporting the fixing sleeve (310); the elastic member (430) applies an elastic force to the sliding sleeve (410) to move the sliding sleeve (410) away from the baffle plate (321).

4. A fire protection cable according to claim 3, characterized in that said baffles (321) at both ends of the same fixed sleeve (310) are arranged crosswise to said traction ropes (420) between the corresponding sliding sleeves (410), said elastic element (430) being abutted between two sliding sleeves (410).