A fire-resistant insulated cable

Abstract

The present invention discloses a fire-resistant insulated cable, comprising a cable conductor, the outer side of the cable conductor is wrapped with a conductor protection filling layer, the outer side of the conductor protection filling layer is provided with an armored shielding layer, the outer side of the armored shielding layer is provided with a protective insulating layer, the outer side of the protective insulating layer is covered with an insulating fire-resistant jacket, the protective insulating layer comprises an insulating sheath, the interior of the insulating sheath is provided with a plurality of protective ceramic rings linearly distributed along the axis of the insulating sheath, and both ends of the protective ceramic rings are provided with docking grooves. The present invention adds a layer of insulating fire-resistant jacket to the outside of the cable conductor, the main material of the insulating fire-resistant jacket is a fire-resistant cotton woven protective jacket, and the interior of the fire-resistant cotton woven protective jacket is filled with refractory fillers composed of sand, graphite, silicon carbide, refractory aggregates, etc., which can insulate against external heat, and direct flame combustion will not ignite the insulating fire-resistant jacket, thereby improving the fire resistance and heat insulation performance of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, in particular to a fire-resistant insulated cable. Background Art

[0002] A cable is a device for transmitting electrical energy or signals. It is usually a rope-like cable made up of several or several groups of wires (at least two in each group). Each group of wires is insulated from each other and often twisted around a central wire. The entire outer layer is covered with a highly insulating covering. The cable has the characteristics of internal power conduction and external insulation. Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc. Among them, fire-resistant cables are also called fire-resistant insulated cables, which can work continuously for a certain period of time in high temperature environments.

[0003] However, when fire-resistant insulated cables operate in high-temperature environments, heat accumulates around the cables and cannot be dissipated, and enters the interior of the cables along the cable sheath, shortening the cable operation time, and the cable sheath will burn due to external flames; therefore, it does not meet existing needs. We have proposed a fire-resistant insulated cable. Summary of the Invention

[0004] The purpose of the present invention is to provide a fire-resistant insulated cable to solve the problems proposed in the above-mentioned background technology that when the fire-resistant insulated cable is running in a high-temperature environment, the heat accumulated around the cable cannot be dissipated and enters the interior of the cable along the cable sheath, thereby shortening the cable operation time and the cable sheath will burn due to external flames.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a fire-resistant insulated cable, comprising a cable conductor, the outer side of the cable conductor is wrapped with a conductor protection filling layer, the outer side of the conductor protection filling layer is provided with an armored shielding layer, the outer side of the armored shielding layer is provided with a protective insulating layer, the outer side of the protective insulating layer is covered with an insulating fire-resistant jacket, the protective insulating layer comprises an insulating sheath, the interior of the insulating sheath is provided with a plurality of protective ceramic rings linearly distributed along the axis of the insulating sheath, both ends of the protective ceramic rings are provided with docking grooves, an intermediate connecting ceramic body is provided between every two adjacent protective ceramic rings, splicing ceramic rings are fixed on the inner and outer sides of the intermediate connecting ceramic body, and a rubber connecting ring is clamped between two adjacent splicing ceramic rings located on the outer side of the intermediate connecting ceramic body;

[0006] The outer surface of the rubber connecting ring is sprayed with a layer of ceramic particle coating. The intermediate connecting ceramic body includes a ring body. Two inclined contact rings are fixed on both sides of the ring body. The material of the contact ring is spring steel. The two contact rings located on the same side of the intermediate connecting ceramic body are V-shaped. The contact ring is clamped on the inner side of the docking groove, and the cross-section of the part where the contact ring contacts the inner wall of the docking groove is circular.

[0007] Preferably, the insulating fire-resistant outer jacket includes a fire-proof cotton woven protective sleeve, the inner surface of the fire-proof cotton woven protective sleeve is coated with adhesive, the fire-proof cotton woven protective sleeve is bonded and fixed to the insulating outer skin by the adhesive, a reinforced inner tube is fixed inside the fire-proof cotton woven protective sleeve, a plurality of distribution holes are penetrated through the outer surface of the reinforced inner tube, and a refractory filler is filled between the reinforced inner tube and the fire-proof cotton woven protective sleeve.

[0008] Preferably, the refractory filler includes sand, graphite, silicon carbide and refractory aggregate, the ratio of the sand, graphite, silicon carbide and refractory aggregate is 8:1:0.5:0.5, the sand is fine sand and does not contain impurities, and the sand is dried.

[0009] Preferably, a cooling protective sheath is provided on the outside of the insulating fire-resistant jacket, and the cooling protective sheath includes a cooling water bag, the cooling water bag is filled with water and wrapped on the outside of the fireproof cotton woven protective sheath, and the outside of the cooling water bag is wrapped with a protective wrapping cloth, and the material of the protective wrapping cloth is fireproof cloth.

[0010] Preferably, a locking strip is fixed to one side edge of the protective wrapping cloth, one side of the locking strip is bent downward in a C shape, and an anti-slip connecting strip is fixed to the other side edge of the protective wrapping cloth, one side of the anti-slip connecting strip is bent upward in an arc shape, and the two side edges of the protective wrapping cloth are fixed by the locking strip and the anti-slip connecting strip.

[0011] Preferably, a plurality of linearly arranged inwardly extending connecting sleeves are fixed inside both sides of the cooling water bag, a cooling pipe is provided in the middle of both sides of the cooling water bag, the cooling pipe is fitted with a fireproof cotton woven protective sleeve and a plurality of metal heat conductors are linearly arranged inside the cooling pipe, and both ends of the metal heat conductors pass through the cooling pipe and extend to the inside of the inwardly extending connecting sleeve.

[0012] Preferably, two symmetrically distributed C-shaped fins are provided in the middle position of the metal heat conductor, and sealing grooves are provided on the outer sides of both side ends of the metal heat conductor. A sealing ring is clamped on the inner side of the sealing groove, and the sealing ring is located between the cooling pipe and the metal heat conductor.

[0013] Preferably, a coolant input pipe is fixedly connected to one end of the cooling pipe, a coolant recovery pipe is fixedly connected to the other end of the cooling pipe, and the other end of the coolant recovery pipe is fixedly connected to a coolant storage tank.

[0014] Preferably, a micro-circulating cooling pump is provided between the end of the coolant inlet pipe away from the cooling pipe and the coolant storage water tank, and the input end and output end of the micro-circulating cooling pump are fixed with connecting hoses, and the micro-circulating cooling pump is connected to the coolant inlet pipe and the coolant storage water tank through connecting hoses.

[0015] Preferably, the contact surface between the protective ceramic ring and the splicing ceramic ring is a spherical surface.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes a protective ceramic ring, a spliced ​​ceramic ring, and an intermediate connecting ceramic body to form a ceramic structure tube body, which is used to isolate external heat. After the insulating outer skin is damaged by flames, the protective ceramic ring, the spliced ​​ceramic ring, and the intermediate connecting ceramic body isolate the external flames, thereby preventing the external flames from damaging the inside of the cable and ensuring the normal operation of the cable.

[0018] 2. In the present invention, the contact surface between the protective ceramic ring and the splicing ceramic ring is a spherical surface. When the cable is bent, the protective ceramic ring can freely rotate in contact with the outer surface of the splicing ceramic ring, and the protective ceramic ring and the splicing ceramic ring always maintain contact during the rotation process, thereby improving the bending resistance of the cable while ensuring that the fire-proof component composed of the protective ceramic ring, the splicing ceramic ring and the intermediate connecting ceramic body will not be damaged by the bending of the cable;

[0019] 3. The present invention adds an insulating fire-resistant jacket on the outside of the cable. The main material of the insulating fire-resistant jacket is a fire-resistant cotton braided protective jacket woven with fire-resistant cotton. The inside of the fire-resistant cotton braided protective jacket is filled with refractory fillers composed of sand, graphite, silicon carbide, refractory aggregate, etc., which can isolate the external heat. The flame will not ignite the insulating fire-resistant jacket directly, thereby improving the fire resistance and heat insulation performance of the cable.

[0020] 4. In the present invention, when the ambient temperature around the cable rises, the heat flows along the protective wrapping cloth into the cooling water bag. The water in the cooling water bag absorbs the external heat and transfers it to the metal heat conductor. Then the coolant flowing in the cooling pipe absorbs the heat in the metal heat conductor, which is used to reduce the heat in the external environment of the cable and prevent the heat from entering the interior of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0022] Figure 2 Schematic diagram of the structure of the protective insulation layer of the present invention;

[0023] Figure 3 for Figure 2 A magnified view of the structure at point A;

[0024] Figure 4 This is a schematic diagram of the assembly of the cooling protection sheath and the cable of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the cooling protection sheath of the present invention;

[0026] Figure 6 for Figure 5 A magnified view of the structure at B in the middle;

[0027] Figure 7 This is a schematic diagram of the structure of the cooling water bag of the present invention;

[0028] Figure 8 for Figure 7 A magnified view of the structure at C in the middle;

[0029] Figure 9 Schematic diagram of the structure of the metal heat conductor of the present invention;

[0030] Figure 10 This is a schematic structural diagram of the insulating fire-resistant jacket of the present invention;

[0031] Figure 11 This is a schematic structural diagram of the reinforced inner tube of the present invention.

[0032] In the figure: 1. Cable conductor; 2. Insulating fire-resistant jacket; 201. Fire-resistant cotton braided protective sleeve; 202. Reinforced inner tube; 203. Refractory filler; 204. Distribution hole; 3. Cooling protection jacket; 301. Protective wrapping cloth; 302. Cooling water bag; 303. Cooling pipe; 304. Cooling liquid inlet pipe; 305. Locking clip; 306. Cooling liquid recovery pipe; 307. Anti-slip clip; 308. Metal heat conductor; 309. Inner connecting sleeve; 310. Sealing slot; 311. Sealing ring; 4. Conductor protection filling layer; 5. Protective insulation layer; 501. Insulating outer skin; 502. Protective ceramic ring; 503. Splicing ceramic ring; 504. Middle connecting ceramic body; 505. Docking groove; 506. Rubber connecting ring; 6. Armored shielding layer. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] The micro-circulation cooling pump (model LFP4024) mentioned in the present invention can be purchased from the market or customized.

[0035] like Figures 1 to 3 As shown, a fire-resistant insulated cable includes a cable conductor 1, the outer side of the cable conductor 1 is wrapped with a conductor protection filling layer 4, the outer side of the conductor protection filling layer 4 is provided with an armored shielding layer 6, the outer side of the armored shielding layer 6 is provided with a protective insulation layer 5, the protective insulation layer 5 includes an insulating sheath 501, the interior of the insulating sheath 501 is provided with a plurality of protective ceramic rings 502 linearly distributed along the axis of the insulating sheath 501, both ends of the protective ceramic rings 502 are provided with docking grooves 505, and an intermediate connecting ceramic body 504 is provided between every two adjacent protective ceramic rings 502, and the inner portion of the intermediate connecting ceramic body 504 is provided with a plurality of protective ceramic rings 502 linearly distributed along the axis of the insulating sheath 501. Spliced ​​ceramic rings 503 are fixed on the side and outside, and a rubber connecting ring 506 is clamped between two adjacent spliced ​​ceramic rings 503 located on the outside of the middle connecting ceramic body 504. The protective ceramic ring 502, the spliced ​​ceramic ring 503, and the middle connecting ceramic body 504 are spliced ​​together to form a ceramic structure tube body, which is used to isolate external heat. After the insulating outer skin 501 is damaged by flames, the protective ceramic ring 502, the spliced ​​ceramic ring 503, and the middle connecting ceramic body 504 isolate the external flames to prevent the external flames from damaging the inside of the cable, thereby ensuring the normal operation of the cable.

[0036] The outer surface of the rubber connecting ring 506 is sprayed with a layer of ceramic particle coating. The intermediate connecting ceramic body 504 includes a ring body. Two inclined contact rings are fixed on both sides of the ring body. The material of the contact ring is spring steel. The two contact rings on the same side of the intermediate connecting ceramic body 504 are V-shaped. The contact ring is clamped on the inner side of the docking groove 505, and the cross-section of the part where the contact ring contacts the inner wall of the docking groove 505 is circular. The rubber connecting ring 506 after spraying ceramic particle coating has good fire resistance and can always maintain the seal between adjacent spliced ​​ceramic rings 503. When the cable is stretched, the adjacent protective ceramic rings 502 are connected through the intermediate connecting ceramic body 504, which improves the cable's tensile strength while ensuring that the protective ceramic rings 502, the spliced ​​ceramic rings 503, and the intermediate connecting ceramic body 504 will not be misaligned, and the fire resistance of the cable will not be damaged.

[0037] The contact surface between the protective ceramic ring 502 and the spliced ​​ceramic ring 503 is spherical to ensure that when the cable is bent, the protective ceramic ring 502 and the spliced ​​ceramic ring 503 can rotate freely, thereby improving the bending resistance of the cable, and the fire-proof component composed of the protective ceramic ring 502, the spliced ​​ceramic ring 503 and the intermediate connecting ceramic body 504 will not be damaged due to the bending of the cable.

[0038] like Figure 1 、 Figure 4 、 Figure 10and Figure 11 As shown, the outer side of the protective insulating layer 5 is covered with an insulating fire-resistant jacket 2, and the insulating fire-resistant jacket 2 includes a fire-proof cotton braided protective sleeve 201. The inner surface of the fire-proof cotton braided protective sleeve 201 is coated with adhesive, and the fire-proof cotton braided protective sleeve 201 is bonded and fixed to the insulating outer skin 501 by the adhesive. A reinforced inner tube 202 is fixed inside the fire-proof cotton braided protective sleeve 201, and a plurality of distribution holes 204 are penetrated through the outer surface of the reinforced inner tube 202. A fire-resistant filler 203 is filled between the reinforced inner tube 202 and the fire-proof cotton braided protective sleeve 201. The fire-proof cotton braided protective sleeve 201 is used to isolate the flame from the cable to prevent the flame from directly igniting the cable, and the fire-resistant filler 203 is used to isolate the external heat to prevent the external heat from being transferred to the inside of the cable.

[0039] The refractory filler 203 includes sand, graphite, silicon carbide and refractory aggregate. The ratio of sand, graphite, silicon carbide and refractory aggregate is 8:1:0.5:0.5. The sand is fine sand and does not contain impurities. The sand has been dried and has good fire-resistant and heat-insulating effects. After mixing with sand, graphite and silicon carbide can evenly guide and distribute heat in the sand, and the refractory aggregate increases the fire resistance and heat resistance of the sand, thereby preventing flames from igniting cables.

[0040] like Figures 4 to 9 As shown, a cooling protective sheath 3 is provided on the outside of the insulating fire-resistant jacket 2, and the cooling protective sheath 3 includes a cooling water bag 302. The cooling water bag 302 is filled with water and wrapped on the outside of the fireproof cotton woven protective sheath 201. The outside of the cooling water bag 302 is wrapped with a protective wrapping cloth 301. The material of the protective wrapping cloth 301 is fireproof cloth. The fireproof cloth can be selected from acrylic cotton fiber cloth or glass fiber fireproof cloth; a locking clip 305 is fixed on one side of the protective wrapping cloth 301, and one side of the locking clip 305 is bent downward in a C shape, and the other side of the protective wrapping cloth 301 is fixed on the other side of the protective wrapping cloth 301. An anti-slipping connecting strip 307 is fixed, and one side of the anti-slipping connecting strip 307 is bent upward in an arc shape. The two side edges of the protective wrapping cloth 301 are fixed by the locking connecting strip 305 and the anti-slipping connecting strip 307. The two side edges of the protective wrapping cloth 301 are fixed by using the locking connecting strip 305 and the anti-slipping connecting strip 307, so that the protective wrapping cloth 301 tightens the cooling water bag 302 and makes the cooling water bag 302 fit tightly to the outer surface of the fireproof cotton woven protective cover 201, and the cooling water bag 302 is used to absorb external heat, thereby preventing external heat from entering the cable.

[0041] A plurality of linearly arranged inner connecting sleeves 309 are fixed inside both sides of the cooling water bag 302. A cooling pipe 303 is provided in the middle of both sides of the cooling water bag 302. The cooling pipe 303 is fitted with the fireproof cotton woven protective sleeve 201 and a plurality of metal heat conductive parts 308 are linearly arranged inside the cooling pipe 303. Both ends of the metal heat conductive parts 308 pass through the cooling pipe 303 and extend to the inside of the inner connecting sleeve 309. The end of the metal heat conductive part 308 extending into the inner connecting sleeve 309 is used to guide the heat absorbed by the water inside the cooling water bag 302, so that the heat absorbed by the cooling water bag 302 is concentrated inside the metal heat conductive part 308.

[0042] Two symmetrically distributed C-shaped fins are provided in the middle position of the metal heat conductor 308, and sealing grooves 310 are provided on the outer sides of the two side ends of the metal heat conductor 308. A sealing ring 311 is clamped on the inner side of the sealing groove 310. The sealing ring 311 is located between the cooling tube 303 and the metal heat conductor 308. The sealing ring 311 is used to seal the connection between the metal heat conductor 308 and the cooling tube 303 to prevent the coolant flowing inside the cooling tube 303 from leaking out from the gap at the connection between the metal heat conductor 308 and the cooling tube 303.

[0043] One end of the cooling pipe 303 is fixedly connected to a coolant input pipe 304, and the other end of the cooling pipe 303 is fixedly connected to a coolant recovery pipe 306. The other end of the coolant recovery pipe 306 is fixedly connected to a coolant storage water tank. A micro-circulation cooling pump is provided between the end of the coolant input pipe 304 away from the cooling pipe 303 and the coolant storage water tank. The input and output ends of the micro-circulation cooling pump are fixed with connecting hoses. The micro-circulation cooling pump is connected to the coolant input pipe 304 and the coolant storage water tank through connecting hoses. The coolant storage water tank stores coolant, and the micro-circulation cooling pump extracts the coolant in the coolant storage water tank through the connecting hose and sends it into the coolant input pipe 304 and the cooling pipe 303. When the coolant flows in the cooling pipe 303, it dissipates the heat inside the metal heat conductor 308. The coolant finally returns to the coolant storage water tank through the coolant recovery pipe 306, realizing the circulation of the coolant and absorbing the heat of the metal heat conductor 308.

[0044] Working principle: insert the reinforcing inner tube 202 into the interior of the fireproof cotton braided protective sleeve 201 from one end of the fireproof cotton braided protective sleeve 201, then close one end of the fireproof cotton braided protective sleeve 201, and adjust the position of the reinforcing inner tube 202 so that the axis of the reinforcing inner tube 202 and the axis of the fireproof cotton braided protective sleeve 201 remain coincident, and fill the refractory filler 203 mixed with sand, graphite, silicon carbide and refractory aggregate in proportion from the closed end of the fireproof cotton braided protective sleeve 201 into the interior of the fireproof cotton braided protective sleeve 201. During the filling process, the outer surface of the fireproof cotton braided protective sleeve 201 is knocked so that the refractory filler 203 is evenly distributed between the fireproof cotton braided protective sleeve 201 and the reinforcing inner tube 202 through the distribution holes 204. After the refractory filler 203 is filled, the unclosed end of the fireproof cotton braided protective sleeve 201 is closed.

[0045] After the fireproof cotton woven protective sleeve 201 is installed, the cooling water bag 302 is wrapped around the outside of the fireproof cotton woven protective sleeve 201, and the cooling pipe 303 is placed between the two side edges of the cooling water bag 302, ensuring that the end of the metal heat conductor 308 outside the cooling pipe 303 is inserted into the inner connecting sleeve 309. After the cooling water bag 302 and the cooling pipe 303 are installed, the protective wrapping cloth 301 is placed under the cooling water bag 302, and the locking clip 305 and the anti-slip clip 307 are pulled so that the protective wrapping cloth 301 wraps the cooling water bag 302 and presses the cooling water bag 302 against the outside of the fireproof cotton woven protective sleeve 201, and the locking clip 305 and the anti-slip clip 307 are clipped and fixed.

[0046] When a fire occurs outside and causes the temperature of the environment around the cable to rise, the heat in the environment around the cable will pass through the protective wrapping cloth 301 and the cooling water bag 302 and enter the water inside the cooling water bag 302. After the water absorbs the heat, its temperature rises. Since one end of the metal heat conductor 308 extends into the inner connecting sleeve 309, the heat absorbed by the water is transferred to the metal heat conductor 308. At the same time, the micro-circulation cooling pump is powered on and starts to extract the coolant from the coolant storage tank through the connecting hose. The coolant enters the coolant input pipe 304 and enters the cooling pipe 303. When the coolant flows in the cooling pipe 303 and passes through the metal heat conductor 308, the coolant absorbs and takes away the heat inside the metal heat conductor 308, delaying the time for the water temperature inside the cooling water bag 302 to rise, delaying the influence of the heat in the external environment on the cable, and extending the operation time of the cable.

[0047] When the cooling protective sheath 3 fails or is damaged, the fire-resistant filler 203 filled inside the fireproof cotton woven protective sheath 201 isolates the cable from the external environment, preventing the heat in the external environment from passing through the fire-resistant filler 203 and entering the cable. When the flame burns and causes the protective wrapping cloth 301 and the cooling water bag 302 to be damaged, the water inside the cooling water bag 302 leaks to reduce the flame. At the same time, the fire-resistant filler 203 has a non-combustible property, and the external flame is blocked by the insulating fire-resistant jacket 2, so that the cable will not be directly burned due to the influence of the external flame.

[0048] At the same time, the inside of the insulating sheath 501 is provided with a ceramic fireproof component formed by a protective ceramic ring 502, a spliced ​​ceramic ring 503, and an intermediate connecting ceramic body 504. The protective ceramic ring 502, the spliced ​​ceramic ring 503, and the intermediate connecting ceramic body 504 can isolate the heat generated by the external flame to ensure that the cable conductor inside the cable will not be affected by the external flame. After the cooling protection sheath 3 and the insulating sheath 501 are damaged, the ceramic fireproof component composed of the protective ceramic ring 502, the spliced ​​ceramic ring 503, and the intermediate connecting ceramic body 504 seals and protects the cable conductor 1, the conductor protection filling layer 4, and the armored shielding layer 6 inside the cable to avoid the flame from directly affecting the inside of the cable to ensure the normal operation of the cable.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A fire-resistant insulated cable, comprising a cable conductor (1), the outer side of the cable conductor (1) being wrapped with a conductor protection filling layer (4), the outer side of the conductor protection filling layer (4) being provided with an armored shielding layer (6), characterized in that: The armored shielding layer (6) is provided with a protective insulating layer (5) on the outside, and the protective insulating layer (5) is covered with an insulating fire-resistant jacket (2) on the outside, and the protective insulating layer (5) includes an insulating outer skin (501), and the inside of the insulating outer skin (501) is provided with a plurality of protective ceramic rings (502) linearly distributed along the axis of the insulating outer skin (501), and both ends of the protective ceramic rings (502) are provided with docking grooves (505), and an intermediate connecting ceramic body (504) is provided between each two adjacent protective ceramic rings (502), and splicing ceramic rings (503) are fixed on the inside and outside of the intermediate connecting ceramic body (504), and a rubber connecting ring (506) is clamped between two adjacent splicing ceramic rings (503) located on the outside of the intermediate connecting ceramic body (504); The outer surface of the rubber connecting ring (506) is sprayed with a layer of ceramic particle coating. The intermediate connecting ceramic body (504) includes a ring body. Two inclined contact rings are fixed on both sides of the ring body. The material of the contact rings is spring steel. The two contact rings located on the same side of the intermediate connecting ceramic body (504) are V-shaped. The contact rings are clamped on the inner side of the docking groove (505), and the cross-section of the part where the contact ring contacts the inner wall of the docking groove (505) is circular.

2. A fire-resistant insulated cable according to claim 1, characterized in that: The insulating fire-resistant outer jacket (2) includes a fire-resistant cotton braided protective sleeve (201), the inner surface of the fire-resistant cotton braided protective sleeve (201) is coated with an adhesive, and the fire-resistant cotton braided protective sleeve (201) is bonded and fixed to the insulating outer skin (501) by the adhesive, and a reinforced inner tube (202) is fixed inside the fire-resistant cotton braided protective sleeve (201), and a plurality of distribution holes (204) are provided through the outer surface of the reinforced inner tube (202), and a fire-resistant filler (203) is filled between the reinforced inner tube (202) and the fire-resistant cotton braided protective sleeve (201).

3. A fire-resistant insulated cable according to claim 2, characterized in that: The refractory filler (203) comprises sand, graphite, silicon carbide and refractory aggregate, wherein the ratio of the sand, graphite, silicon carbide and refractory aggregate is 8:1:0.5:0.5, the sand is fine sand and does not contain impurities, and the sand is dried.

4. A fire-resistant insulated cable according to claim 1, characterized in that: A cooling protective sheath (3) is provided on the outside of the insulating fire-resistant outer jacket (2), and the cooling protective sheath (3) includes a cooling water bag (302). The cooling water bag (302) is filled with water and wrapped on the outside of the fireproof cotton woven protective sheath (201). The cooling water bag (302) is wrapped on the outside of the cooling water bag (302), and the protective wrapping cloth (301) is made of fireproof cloth.

5. A fire-resistant insulated cable according to claim 4, characterized in that: A locking clip (305) is fixed to one side edge of the protective wrapping cloth (301), one side of the locking clip (305) is bent downward in a C-shape, and an anti-slipping clip (307) is fixed to the other side edge of the protective wrapping cloth (301), one side of the anti-slipping clip (307) is bent upward in an arc shape, and the two side edges of the protective wrapping cloth (301) are fixed by the locking clip (305) and the anti-slipping clip (307).

6. A fire-resistant insulated cable according to claim 4, characterized in that: A plurality of linearly arranged inner connecting sleeves (309) are fixed inside both sides of the cooling water bag (302), a cooling pipe (303) is provided in the middle of both sides of the cooling water bag (302), the cooling pipe (303) is fitted with a fireproof cotton woven protective sleeve (201), and a plurality of metal heat conducting members (308) are linearly arranged inside the cooling pipe (303), and both ends of the metal heat conducting member (308) pass through the cooling pipe (303) and extend into the inner connecting sleeve (309).

7. A fire-resistant insulated cable according to claim 6, characterized in that: Two symmetrically distributed C-shaped fins are provided in the middle of the metal heat conducting member (308), and sealing grooves (310) are provided on the outer sides of both end portions of the metal heat conducting member (308). A sealing ring (311) is clamped inside the sealing groove (310), and the sealing ring (311) is located between the cooling pipe (303) and the metal heat conducting member (308).

8. A fire-resistant insulated cable according to claim 7, characterized in that: One end of the cooling pipe (303) is fixedly connected to a cooling liquid input pipe (304), the other end of the cooling pipe (303) is fixedly connected to a cooling liquid recovery pipe (306), and the other end of the cooling liquid recovery pipe (306) is fixedly connected to a cooling liquid storage tank.

9. A fire-resistant insulated cable according to claim 8, characterized in that: A micro-circulating cooling pump is provided between the end of the cooling liquid input pipe (304) away from the cooling pipe (303) and the cooling liquid storage water tank. Connecting hoses are fixed to the input and output ends of the micro-circulating cooling pump. The micro-circulating cooling pump is connected to the cooling liquid input pipe (304) and the cooling liquid storage water tank via the connecting hoses.

10. The fire-resistant insulated cable according to claim 1, characterized in that: The contact surface between the protective ceramic ring (502) and the spliced ​​ceramic ring (503) is a spherical surface.

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