A reinforced inorganic mineral insulated fireproof cable

Abstract

The present application relates to a reinforced inorganic mineral insulated fireproof cable, belonging to the field of cable technology, comprising a conductor and a covering layer for covering the conductor, the covering layer comprising an inner sheath and an outer sheath, the inner sheath comprising an inner shielding layer, a synthetic mica layer, a metal sheath and a ceramic oxygen-isolating layer, a plurality of isolation plates are arranged at intervals on the outer sheath, both sides of the isolation plates are provided with mounting grooves, an installation ring is arranged on the isolation plate and in the mounting groove, a metal bellows is arranged between the isolation plate and the mounting ring, a driving device is arranged in the isolation plate, the driving device is used to drive the installation ring to move along the outer sheath, and drive the metal bellows to sleeve the outer sheath; the fireproof cable also includes a fixing member, which is used to fix and connect the mounting rings on both sides; the fireproof cable also includes a gas cylinder, which is filled with compressed inert gas, the gas cylinder is connected to the mounting groove, and is used to inject compressed inert gas between the metal bellows and the outer sheath. The present application has the advantage of improving the fireproof effect of the cable.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a reinforced inorganic mineral insulated fireproof cable. Background Art

[0002] Cable is a wire that transmits electricity from one place to another, made of one or more mutually insulated conductors and an outer insulating protective layer. Cables are usually rope-like cables twisted together by several or several groups of conductors (at least two in each group). Each group of conductors is insulated from each other and often twisted around a center, and the entire outer layer is covered with a highly insulating covering. Cables have the characteristics of internal power supply and external insulation. Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc. With the continuous and rapid development of my country's economy, more and more combustibles are used in modern office buildings, hotels, restaurants, railway stations and other important public places, and people's dependence on electricity is increasing. There are more and more cables in the cable trench, and the cable trench is getting longer and longer, and the probability of fire accidents is also increasing accordingly. Therefore, cables need to be designed for fire protection.

[0003] Existing power fireproof cables usually use inorganic mineral fireproof cables, most of which use flame-retardant materials to wrap the conductor (copper wire) to adopt passive fire protection when the fire is weak, simply isolating the external combustion, but cannot control the fire caused by short circuit in time, that is, it cannot solve the combustion caused by internal short circuit. At the same time, when the fire is more intense, the cable is difficult to effectively defend, and the fire often spreads along the cable to various places, causing large-scale cable burns. Production cannot be resumed in a short time, and the economic losses are heavy. Summary of the invention

[0004] In order to improve the fire protection effect of cables, the present application provides a reinforced inorganic mineral insulated fire-resistant cable.

[0005] The present application provides a reinforced inorganic mineral insulated fireproof cable adopts the following technical solution:

[0006] A reinforced inorganic mineral insulated fireproof cable, comprising a conductor and a covering layer for covering the conductor, the covering layer comprising an inner sheath and an outer sheath, the inner sheath comprising an inner shielding layer, a synthetic mica layer, a metal sheath and a ceramic oxygen-isolating layer, the inner shielding layer being used for sleeve-connecting the conductor, and the synthetic mica layer, the metal sheath and the ceramic oxygen-isolating layer being sleeved on the inner shielding layer in sequence, the outer sheath being used for sleeve-connecting the ceramic oxygen-isolating layer, a plurality of isolation plates being arranged at intervals on the outer sheath, both sides of the isolation plates being provided with mounting grooves, the isolation plates being provided with mounting rings in the ... A metal bellows is arranged between the isolation plate and the mounting ring, and the metal bellows is crimped in the mounting groove. A driving device is arranged in the isolation plate, and the driving device is used to drive the mounting ring to move along the outer sheath, thereby driving the metal bellows to be sleeved on the outer sheath; the fire-proof cable also includes a fixing part, and the fixing part is used to fix the mounting rings on both sides after the facing mounting rings abut against each other; the fire-proof cable also includes a gas cylinder, and the gas cylinder is filled with compressed inert gas. The gas cylinder is connected to the mounting groove and is used to inject compressed inert gas between the metal bellows and the outer sheath.

[0007] Optionally, the driving device includes a spring arranged in the mounting groove, the axial direction of the spring is perpendicular to the isolation plate, the spring is placed in the mounting groove in a compressed state, the mounting ring abuts against the end of the spring, and the driving device also includes a locking member and a releasing member, the locking member is used to fix the mounting ring to the mounting groove and to keep the spring in a compressed state, and the releasing member is used to release the fixing state of the mounting ring, so that the spring drives the mounting ring to move out of the mounting groove and drive the metal bellows to be sleeved on the outer sheath.

[0008] Optionally, the locking member includes a fixing rod arranged on the mounting ring, the fixing rod facing the mounting groove, a fixing groove is provided on the isolation plate and at the bottom wall of the mounting groove, a convex strip is fixed circumferentially on the fixing rod, and an annular groove for the convex strip to be inserted is provided on the circumferential wall of the fixing groove.

[0009] Optionally, the release member includes a bimetallic plate arranged on the bottom wall of the mounting groove, the bimetallic plate includes a steel sheet and a copper sheet, the steel sheet and the copper sheet are fitted and fixedly connected to each other, the steel sheet and the copper sheet are both bent toward the mounting ring and the bent ends abut the mounting ring, and the middle part of the copper sheet is fixedly arranged on the bottom wall of the mounting groove.

[0010] Optionally, the fixing member includes a magnet arranged on a surface of the mounting ring facing away from the mounting groove and a first metal plate arranged in the middle of the isolation plate, and the mounting ring moves toward the first metal plate and is adsorbed on the first metal plate.

[0011] Optionally, a plurality of first through holes are formed on the first metal plate, and projections of the first through holes on the mounting ring are located on the inner side of the magnet. After the magnet is adsorbed on the first metal plate, the first through holes are located on the inner side of the magnet and are used to connect adjacent metal bellows.

[0012] Optionally, an air pipe is provided between the gas cylinder and the isolation plate, an air intake channel is opened in the isolation plate, the air pipe is connected with the air intake channel, the air intake channel is connected with the fixing groove, and after the fixing rod is inserted into the fixing groove, the air intake channel is closed.

[0013] Optionally, a receiving groove is provided in the inner ring of the mounting ring, and the receiving groove is connected end to end to form a ring. A flame retardant is arranged in the receiving groove, and the flame retardant is in a paste form. When the mounting ring slides along the outer sheath, the flame retardant is smeared on the outer wall of the outer sheath. A sealing member is arranged in the mounting ring, and the sealing member is used to close the opening of the receiving groove and seal the flame retardant into the receiving groove.

[0014] Optionally, the sealing member includes a wax plate disposed at the opening of the receiving groove, both sides of the wax plate are heat-sealed at the opening of the receiving groove, and the wax plate is ring-shaped to seal the opening of the receiving groove.

[0015] Optionally, a power supply and a warning broadcast are provided between two installation rings facing each other, and the installation rings, the power supply and the warning broadcast are connected by wires. After the installation rings on both sides are abutted, the power supply and the warning broadcast are electrically connected to emit a warning sound.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] During normal use of the cable, the inner sheath protects and shields the conductor to ensure the normal transmission of electrical energy by the conductor. Under the action of the oxygen barrier, the conductor is separated from oxygen, thereby reducing the possibility of fire caused by the increase in conductor temperature.

[0018] When the cable burns due to the increase in conductor temperature, the driving device drives the installation ring to move along the outer sheath. When the installation ring moves, it drives the metal bellows to expand and connect with the outer sheath. When the adjacent installation rings are abutted, the installation rings are fixedly connected by the fixing parts, so that the metal bellows is connected to the outer sheath between the isolation plates. Under the action of the metal bellows, the outer sheath is separated from the air. At this time, after the combustion of the outer sheath consumes the oxygen in the metal bellows, the combustion of the outer sheath stops, thereby reducing the possibility of continuous combustion of the cable and improving the fire prevention effect of the cable; further, under the action of the isolation plate, the tendency of the fire to spread along the cable is blocked, so that the cable only burns at the place where the fire occurs, rather than spreading along the cable, further improving the fire prevention performance of the cable; further, when the cable is in an environment where a fire occurs, the metal bellows is connected to the outer sheath, and the fire is isolated from the outer sheath, thereby reducing the possibility of the fire causing the outer sheath to burn and improving the fire prevention performance of the cable;

[0019] When the metal bellows is fitted onto the outer sheath, the compressed inert gas in the gas cylinder is injected between the outer sheath and the metal bellows, and the cable is rapidly cooled, thereby quickly extinguishing the fire in the cable and improving the fire resistance of the cable; further, after the cable is rapidly cooled, it has a certain hindering effect on the spread of fire, thereby reducing the possibility of rapid spread of the fire along the outer sheath, further improving the fire resistance of the cable; at the same time, after the inert gas is injected into the outer sheath and the metal bellows, the inert gas has a suppressive effect on the fire, and at the same time, the inert gas does not support the combustion of the outer sheath, so that the fire is quickly suppressed and the fire is extinguished, further improving the fire resistance of the cable; at the same time, after the compressed inert gas rapidly cools the outer sheath, the heat at the high temperature of the conductor is transferred toward the outer sheath, thereby reducing the possibility of continued high temperature in the local area of ​​the cable, thereby reducing the possibility of the cable burning again. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an enhanced inorganic mineral insulated fireproof cable according to an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the overall structure of an enhanced inorganic mineral insulated fireproof cable according to an embodiment of the present application;

[0022] Figure 3 This is a vertical cross-sectional view of an enhanced inorganic mineral insulated fireproof cable according to an embodiment of the present application.

[0023] Figure 4 It is a transverse cross-sectional view of a reinforced inorganic mineral insulated fireproof cable according to an embodiment of the present application;

[0024] Figure 5 yes Figure 3 A magnified schematic diagram of part A;

[0025] Figure 6 yes Figure 5 A magnified schematic diagram of part B;

[0026] Figure 7 This is a cross-sectional view of an expanded metal bellows in a reinforced inorganic mineral insulated fire-resistant cable according to an embodiment of the present application;

[0027] Figure 8 yes Figure 7 A magnified schematic diagram of part C;

[0028] Fig. 9 A cross-sectional view of an installation ring in a reinforced inorganic mineral insulated fire-resistant cable according to an embodiment of the present application.

[0029] Description of reference numerals: 1. conductor; 2. cover layer; 21. inner shielding layer; 22. synthetic mica layer; 23. metal sheath; 24. ceramic oxygen barrier layer; 25. outer sheath; 3. isolation plate; 4. mounting groove; 5. mounting ring; 6. metal bellows;

[0030] 7. driving device; 71. spring; 72. fixing rod; 73. convex strip; 75. steel sheet; 76. copper sheet;

[0031] 8. fixing member; 81. magnet; 82. first metal plate;

[0032] 9. Gas cylinder; 10. Fixing groove; 11. Annular groove; 12. First through hole; 13. Gas pipe; 14. Air intake passage; 15. Receiving groove; 16. Flame retardant; 17. Wax plate; 18. Power supply; 19. Warning broadcast; 20. Wire; 26. Contact column. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1 -Attached Fig. 9 This application is described in further detail.

[0034] The present application embodiment discloses a reinforced inorganic mineral insulated fireproof cable. Figure 1 The reinforced inorganic mineral insulated fireproof cable comprises a conductor 1 and a covering layer 2 for covering the conductor 1, the covering layer 2 comprises an inner sheath and an outer sheath 25, the inner sheath comprises an inner shielding layer 21, a synthetic mica layer 22, a metal sheath 23 and a ceramic oxygen-insulating layer 24, the inner shielding layer 21 is used to sleeve the conductor 1, and the synthetic mica layer 22, the metal sheath 23 and the ceramic oxygen-insulating layer 24 are sequentially sleeved with the inner shielding layer 21, and the outer sheath 25 is used to sleeve the ceramic oxygen-insulating layer 24. Under the action of the inner sheath and the outer sheath 25, the conductor 1 is protected.

[0035] Reference Figure 2 , Figure 3 , Figure 4 and Figure 5 In order to improve the fireproof performance of the cable, a plurality of isolation plates 3 are arranged at intervals on the outer sheath 25. The isolation plates 3 are disc-shaped, and the diameter of the isolation plates 3 is larger than the outer diameter of the outer sheath 25. Installation grooves 4 are provided on both sides of the isolation plates 3. The outer sheath 25 is located in the middle of the installation groove 4 and is connected to the installation groove 4. A mounting ring 5 is arranged on the isolation plate 3 and located in the installation groove 4. The mounting ring 5 is annular and is slidably sleeved on the outer sheath 25. A metal bellows 6 is arranged between the isolation plate 3 and the mounting ring 5. The metal bellows 6 is crimped in the mounting groove 4. A driving device 7 is arranged in the isolation plate 3. The driving device 7 is used to drive the mounting ring 5 to move along the outer sheath 25, thereby driving the metal bellows 6 to sleeve the outer sheath 25. The fireproof cable also includes a fixing member 8, which is used to fix the mounting rings 5 ​​on both sides after the facing mounting rings 5 ​​abut against each other.

[0036] When a fire occurs in the cable or in the environment where the cable is located, the driving device 7 drives the installation ring 5 to slide out of the installation groove 4, and the installation ring 5 slides along the outer sheath 25. The installation ring 5 drives the metal bellows 6 to move out of the installation groove 4 and sleeve the outer sheath 25. The installation ring 5 runs to the mutually abutting position, and then the abutting installation rings 5 ​​are fixedly connected by the fixing member 8 to complete the isolation of the outer sheath 25; after the outer sheath 25 is isolated in the metal bellows 6, the metal bellows 6 isolates the external fire, thereby preventing the external open fire from igniting the cable outer sheath. At the same time, when a fire occurs in the conductor 1 inside the cable, the metal bellows 6 is sleeved on the outer sheath 25 to isolate the air, so that the outer sheath 25 is in an oxygen-thin environment, so that the fire in the outer sheath 25 is quickly extinguished, thereby improving the fire resistance of the cable; when a cable fire between two isolation plates 3 spreads along the cable, after the fire spreads to the isolation plate 3, the isolation plate 3 blocks the spread of the fire, thereby avoiding the possibility of the fire continuing to spread along the cable and quickly extinguishing the fire.

[0037] In the embodiment of the present application, the isolation plate 3 is made of a metal plate to prevent the isolation plate 3 from burning, thereby facilitating the prevention of the spread of the cable fire.

[0038] Reference Figure 2 , Figure 3 and Figure 5In order to further improve the fireproof performance of the fireproof cable, the fireproof cable also includes a gas cylinder 9, which is filled with compressed inert gas. The gas cylinder 9 is connected to the installation groove 4 and is used to inject compressed inert gas between the metal bellows 6 and the outer sheath 25; after the metal bellows 6 is sleeved on the outer sheath 25, the compressed inert gas in the gas cylinder 9 is injected into the metal bellows 6, and the inert gas surrounds the cable, thereby quickly extinguishing the fire of the cable; at the same time, because the inert gas is in a compressed state, after the inert gas enters the metal bellows 6, the volume of the inert gas expands rapidly, and a large amount of heat is absorbed to quickly cool down the outer sheath 25. After the temperature of the outer sheath 25 is greatly reduced, the flame retardant effect of the outer sheath 25 is improved, and the fireproof performance of the cable is improved; at the same time, after the temperature of the outer sheath 25 is reduced, the temperature of the inner sheath and the conductor 1 is rapidly reduced. The conductor 1 is a conductive metal, so that the entire section of the conductor 1 continues to cool down, thereby avoiding the possibility of the conductor 1 having a fire point again due to the increase in temperature.

[0039] Reference Figure 4 In the embodiment of the present application, the driving device 7 includes a spring 71 arranged in the mounting groove 4, one end of the spring 71 is fixedly arranged on the bottom wall of the mounting groove 4, the axial direction of the spring 71 is perpendicular to the isolation plate 3, the spring 71 is placed in the mounting groove 4 in a compressed state, and the mounting ring 5 abuts against the end of the spring 71. The driving device 7 also includes a locking member and a releasing member. The locking member is used to fix the mounting ring 5 to the mounting groove 4 and to put the spring 71 in a compressed state. The releasing member is used to release the fixed state of the mounting ring 5, so that the spring 71 drives the mounting ring 5 to move out of the mounting groove 4 and bring The movable metal bellows 6 is sleeved on the outer sheath 25; when the cable operates normally or the external environment is normal, the locking piece fixes the mounting ring 5 in the mounting groove 4. When the mounting ring 5 is fixed, the spring 71 is in a compressed state and is placed in the mounting groove 4; when a fire occurs, the releasing piece releases the fixing effect on the mounting ring 5. After the fixing of the mounting ring 5 is released, the spring 71 pushes the mounting ring 5 to slide along the outer sheath 25. When the mounting ring 5 is separated from the spring 71, the mounting ring 5 has a certain initial velocity and continues to slide along the outer sheath 25, so that adjacent mounting rings 5 ​​abut against each other, and the operation is simple and convenient.

[0040] Reference Figure 3 , Figure 5 and Figure 6In the embodiment of the present application, the locking member includes a fixing rod 72 arranged on the mounting ring 5, a plurality of fixing rods 72 are provided, and the fixing rods 72 are perpendicular to the mounting ring 5, the fixing rods 72 face the mounting groove 4, a fixing groove 10 is provided on the isolation plate 3 and located on the bottom wall of the mounting groove 4, a convex strip 73 is fixedly provided on the circumference of the fixing rod 72, the convex strip 73 is made of rubber, and an annular groove 11 is provided on the circumferential wall of the fixing groove 10 for the convex strip 73 to be inserted; the fixing rod 72 is inserted into the mounting groove 4, at this time, the convex strip 73 is clamped in the fixing groove 10 to fix the fixing rod 72 on the isolation plate 3, thereby fixing the mounting ring 5 in the mounting groove 4, and the operation is simple and convenient.

[0041] Reference Figure 3 and Figure 5 In the embodiment of the present application, the release member includes a bimetallic plate arranged on the bottom wall of the mounting groove 4. The bimetallic plates are provided in multiple groups and are evenly arranged along the axis of the mounting groove 4. The bimetallic plates include a steel sheet 75 and a copper sheet 76. The steel sheet 75 and the copper sheet 76 are fixedly connected to each other. The steel sheet 75 and the copper sheet 76 are bent toward the mounting ring 5 and the bent ends abut the mounting ring 5. The middle part of the copper sheet 76 is fixedly arranged on the bottom wall of the mounting groove 4. When a fire occurs in the environment where the cable is located, the temperature of the cable rises. The increase in the temperature of the cable causes the temperature of the isolation plate 3 to rise. After the temperature of the isolation plate 3 rises, the temperature of the bimetallic plate rises. Because the deformation of the steel sheet 75 is less than the deformation of the copper sheet 76, the copper sheet 76 bends toward the mounting ring 5. The copper sheet 76 bends and abuts against the mounting ring 5, driving the mounting ring 5 to move in a direction away from the bottom wall of the mounting groove 4. When the mounting ring 5 moves slowly, the convex strip 73 is driven to gradually move out of the annular groove 11. Then, under the action of the spring 71, the mounting ring 5 is pushed out of the mounting groove 4. The operation is simple and convenient.

[0042] Reference Figure 7 and Figure 8 In the embodiment of the present application, the fixing member 8 includes a magnet 81 arranged on the surface of the mounting ring 5 away from the mounting groove 4 and a first metal plate 82 arranged in the middle of the isolation plate 3. The mounting ring 5 moves toward the first metal plate 82 and is adsorbed on the first metal plate 82. The diameter of the first metal plate 82 is larger than the outer diameter of the mounting ring 5 and smaller than the diameter of the isolation plate 3. The first metal plate 82 is annular and is sleeved on the outer sheath 25. After the mounting ring 5 moves out of the mounting groove 4 and approaches each other, the magnet 81 is adsorbed on the first metal plate 82, thereby fixing the mounting ring 5 on the first metal plate 82, and the operation is simple and convenient. At the same time, after the mounting ring 5 is adsorbed on the first metal plate 82, the mounting ring 5 and the first metal plate 82 are seamlessly fixed, so that it is convenient for the inert gas to be filled in the metal bellows 6, which is convenient for cable fire extinguishing and fire suppression.

[0043] Reference Figure 7 and Figure 8Furthermore, the magnetic poles of the magnets 81 on the mounting rings 5 ​​on both sides of the first metal plate 82 are opposite, and the magnets 81 are neodymium magnets; when the driving force of the spring 71 on the mounting rings 5 ​​disappears, the mounting rings 5 ​​continue to slide and approach each other under the action of inertia, but after the movement trend of the mounting rings 5 ​​tends to disappear, under the action of the mutual attraction of the magnets 81, the mounting rings 5 ​​continue to be driven to approach each other and adsorbed on the first metal plate 82, so that the metal bellows 6 can be sleeved on the outer sheath 25. Neodymium magnets have the advantage of strong magnetism, which makes it easy to drive the mounting rings 5 ​​to approach each other.

[0044] Reference Figure 7 and Figure 8 In the embodiment of the present application, a plurality of first through holes 12 that are interconnected are provided on the first metal plate 82 and the mounting ring 5. The projection of the first through hole 12 on the mounting ring 5 is located on the inner side of the magnet 81. After the magnet 81 is adsorbed on the first metal plate 82, the first through hole 12 is located on the inner side of the magnet 81 and is used to connect the adjacent metal bellows 6. Under the action of the first through hole 12, the two sides of the first metal plate 82 are connected, so that the inert gas can pass through the first through hole 12 to reach the metal bellows 6 on the other side, thereby achieving the effect of cable fire extinguishing or suppression while reducing the input of gas cylinders 9.

[0045] Reference Figure 3 , Figure 5 and Figure 6 In the embodiment of the present application, an air pipe 13 is arranged between the gas cylinder 9 and the isolation plate 3, and an air inlet channel 14 is opened in the isolation plate 3. The air pipe 13 is connected to the air inlet channel 14, and the air inlet channel 14 is connected to the fixing groove 10. After the fixing rod 72 is inserted into the fixing groove 10, the air inlet channel 14 is closed; the air inlet channel 14 is closed by the fixing rod 72 and the convex strip 73, so that the compressed gas is stored in the gas cylinder 9. When the bimetallic plate pushes out the convex strip 73, the air inlet channel 14 is opened, and the inert gas in the gas cylinder 9 is ejected from the air inlet channel 14 and the fixing groove 10. The ejection speed of the inert gas is greater than the sliding speed of the mounting ring 5, so as to suppress the fire on the cable or extinguish the open flame first, and the inert gas is continuously ejected to compress and extinguish the fire, and the mounting ring 5 then drives the metal bellows 6 to be sleeved on the outer sheath 25, and then the metal bellows 6 is inflated to further improve the fireproof performance of the cable.

[0046] Reference Figure 7 and Fig. 9In the embodiment of the present application, a receiving groove 15 is provided in the inner ring of the mounting ring 5, and the receiving groove 15 opens toward the outer sheath 25. The receiving groove 15 is connected end to end in a ring shape. A flame retardant 16 is arranged in the receiving groove 15, and the flame retardant 16 is in a paste state. When the mounting ring 5 slides along the outer sheath 25, the flame retardant 16 is applied to the outer wall of the outer sheath 25; after the inert gas suppresses or extinguishes the fire on the cable, when the mounting ring 5 drives the metal bellows 6 to sleeve the outer sheath 25, the mounting ring 5 drives the flame retardant 16 to be applied to the outer wall of the outer sheath 25 to provide The fire retardant 16 is applied to the outer sheath 25 to improve the fire retardancy of the cable. At the same time, during the process of applying the flame retardant 16 to the outer sheath 25, the fire on the outer sheath 25 is spread, so that the fire is more evenly applied to the outer sheath 25, and the flame retardant 16 is applied to the fire to extinguish the fire, thereby further improving the fire retardancy of the cable. Furthermore, compared with applying the flame retardant 16 on the outer sheath 25 in advance, because the flame retardant 16 has a certain use time, after a long time, the flame retardant effect of the flame retardant 16 decreases, thereby causing the fire retardancy of the cable to decrease.

[0047] Reference Figure 7 and Fig. 9 In order to increase the storage time of the flame retardant 16, in the embodiment of the present application, a sealing member is provided in the mounting ring 5, and the sealing member is used to close the opening of the receiving groove 15 and seal the flame retardant 16 into the receiving groove 15. The sealing member includes a wax plate 17 arranged at the opening of the receiving groove 15, and both sides of the wax plate 17 are heat-sealed at the opening of the receiving groove 15. The wax plate 17 is annular to seal the opening of the receiving groove 15; under the action of the wax plate 17, the flame retardant 16 is sealed in the receiving groove 15, thereby increasing the service life of the flame retardant 16; at the same time, the wax plate 17 serves as a sealing plate. When the cable burns, the temperature of the mounting ring 5 increases, and the wax plate 17 gradually melts, which facilitates the application of the flame retardant 16 on the outer sheath 25.

[0048] Reference Figure 7 When a fire occurs in a part of the cable or in the environment, in order to facilitate timely discovery, a power supply 18 and a warning broadcast 19 are arranged between the two installation rings 5 ​​facing each other, and the installation rings 5, the power supply 18 and the warning broadcast 19 are connected by a wire 20. Further, contact columns 26 are arranged on the surfaces of the installation rings 5 ​​close to each other, and the contact columns 26 are electrically connected to the wire 20. After the installation rings 5 ​​on both sides abut against each other, the contact columns 26 on both sides abut against each other, and the power supply 18 and the warning broadcast 19 are electrically connected to emit a warning sound; after the cable fire occurs, the installation ring 5 slides toward the first metal plate 82 under the action of the spring 71, the magnet 81 and the inert gas. When the two installation rings 5 ​​abut against each other, the power supply 18 is connected to the warning broadcast 19, and the metal broadcast starts to play a warning sound, which facilitates timely discovery of the fire.

[0049] The implementation principle of the enhanced inorganic mineral insulated fireproof cable in the embodiment of the present application is:

[0050] When a fire occurs in the cable or the environment, the temperature of the cable rises, and the temperature of the isolation plate 3 rises. After the temperature of the isolation plate 3 rises, the temperature of the bimetallic plate rises. Since the deformation of the steel sheet 75 is smaller than the deformation of the copper sheet 76, the copper sheet 76 bends toward the mounting ring 5. The copper sheet 76 bends and abuts against the mounting ring 5, driving the mounting ring 5 to move away from the bottom wall of the mounting groove 4. When the mounting ring 5 moves slowly, the convex strip 73 is driven to gradually move out of the annular groove 11, and then the mounting ring 5 is pushed out of the mounting groove 4 under the action of the spring 71.

[0051] Under the action of the spring 71, the mounting ring 5 drives the metal bellows 6 to be sleeved on the outer sheath 25 and adsorbed on the first metal plate 82. At this time, the power supply 18 is connected to the warning broadcast 19, and the metal broadcast starts to play the warning sound;

[0052] At the same time, after the fixing rod 72 is moved out of the fixing groove 10, the inert gas in the gas cylinder 9 is injected into the metal bellows 6 through the air inlet channel 14 to cool the outer sheath 25; at the same time, after the temperature of the isolation plate 3 increases, the temperature of the mounting ring 5 increases, the wax plate 17 gradually melts, and the opening of the accommodating groove 15 is opened, so that when the mounting ring 5 moves, the flame retardant 16 is coated on the surface of the outer sheath 25.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A reinforced inorganic mineral insulated fireproof cable, characterized in that: The invention comprises a conductor (1) and a covering layer (2) for covering the conductor (1), wherein the covering layer (2) comprises an inner sheath and an outer sheath (25), wherein the inner sheath comprises an inner shielding layer (21), a synthetic mica layer (22), a metal sheath (23) and a ceramic oxygen-isolating layer (24), wherein the inner shielding layer (21) is used for sleeve-connecting the conductor (1), and the synthetic mica layer (22), the metal sheath (23) and the ceramic oxygen-isolating layer (24) are sleeve-connected to the inner shielding layer (21) in sequence, wherein the outer sheath (25) is used for sleeve-connecting the ceramic oxygen-isolating layer (24), wherein a plurality of isolation plates (3) are arranged on the outer sheath (25) at intervals, wherein mounting grooves (4) are provided on both sides of the isolation plates (3), wherein mounting rings (5) are arranged on the isolation plates (3) and in the mounting grooves (4), wherein the isolation plates (3) are provided with mounting rings (5) and are located in the mounting grooves (4). A metal bellows (6) is arranged between the separation plate (3) and the mounting ring (5), and the metal bellows (6) is crimped into the mounting groove (4). A driving device (7) is arranged in the separation plate (3), and the driving device (7) is used to drive the mounting ring (5) to move along the outer sheath (25), thereby driving the metal bellows (6) to be sleeved onto the outer sheath (25); the fireproof cable also includes a fixing member (8), and the fixing member (8) is used to fix the mounting rings (5) on both sides after the facing mounting rings (5) abut against each other; the fireproof cable also includes a gas cylinder (9), and the gas cylinder (9) is filled with compressed inert gas. The gas cylinder (9) is connected to the mounting groove (4) and is used to inject compressed inert gas into the space between the metal bellows (6) and the outer sheath (25); The driving device (7) comprises a spring (71) arranged in the mounting groove (4), the axial direction of the spring (71) is perpendicular to the isolation plate (3), the spring (71) is placed in the mounting groove (4) in a compressed state, the mounting ring (5) abuts against the end of the spring (71), and the driving device (7) also comprises a locking member and a releasing member, the locking member is used to fix the mounting ring (5) in the mounting groove (4) and to put the spring (71) in a compressed state, and the releasing member is used to release the fixing state of the mounting ring (5), so that the spring (71) drives the mounting ring (5) to move out of the mounting groove (4) and drive the metal bellows (6) to be sleeved on the outer sheath (25); The locking member comprises a fixing rod (72) arranged on the mounting ring (5), the fixing rod (72) faces the mounting groove (4), a fixing groove (10) is provided on the isolation plate (3) and located on the bottom wall of the mounting groove (4), a convex strip (73) is fixedly provided in the circumferential direction of the fixing rod (72), and an annular groove (11) is provided on the circumferential wall of the fixing groove (10) for the convex strip (73) to be inserted; An air pipe (13) is provided between the gas cylinder (9) and the isolation plate (3); an air intake passage (14) is provided in the isolation plate (3); the air pipe (13) is in communication with the air intake passage (14); the air intake passage (14) is in communication with the fixing groove (10); and after the fixing rod (72) is inserted into the fixing groove (10), the air intake passage (14) is closed.

2. A reinforced inorganic mineral insulated fireproof cable according to claim 1, characterized in that: The release member comprises a bimetallic plate arranged on the bottom wall of the mounting groove (4), the bimetallic plate comprising a steel sheet (75) and a copper sheet (76), the steel sheet (75) and the copper sheet (76) being fitted and fixedly connected to each other, the steel sheet (75) and the copper sheet (76) are both bent toward the mounting ring (5) and the bent ends abut against the mounting ring (5), and the middle part of the copper sheet (76) is fixedly arranged on the bottom wall of the mounting groove (4).

3. The reinforced inorganic mineral insulated fireproof cable according to claim 1, characterized in that: The fixing member (8) comprises a magnet (81) arranged on the surface of the mounting ring (5) facing away from the mounting groove (4) and a first metal plate (82) arranged in the middle of the isolation plate (3); the mounting ring (5) moves toward the first metal plate (82) and is adsorbed on the first metal plate (82).

4. A reinforced inorganic mineral insulated fireproof cable according to claim 3, characterized in that: The first metal plate (82) is provided with a plurality of first through holes (12), the projections of the first through holes (12) on the mounting ring (5) being located on the inner side of the magnet (81), and after the magnet (81) is adsorbed on the first metal plate (82), the first through holes (12) are located on the inner side of the magnet (81) and are used to connect adjacent metal bellows (6).

5. The reinforced inorganic mineral insulated fireproof cable according to claim 1, characterized in that: The inner ring of the mounting ring (5) is provided with a receiving groove (15), the receiving groove (15) is connected end to end to form a ring, a flame retardant (16) is arranged in the receiving groove (15), the flame retardant (16) is in a paste state, when the mounting ring (5) slides along the outer sheath (25), the flame retardant (16) is smeared on the outer wall of the outer sheath (25), and a sealing member is arranged in the mounting ring (5), the sealing member is used to close the opening of the receiving groove (15) and seal the flame retardant (16) into the receiving groove (15).

6. A reinforced inorganic mineral insulated fireproof cable according to claim 5, characterized in that: The sealing member comprises a wax plate (17) arranged at the opening of the receiving groove (15), both sides of the wax plate (17) are heat-sealed at the opening of the receiving groove (15), and the wax plate (17) is annular to seal the opening of the receiving groove (15).

7. The reinforced inorganic mineral insulated fireproof cable according to claim 1, characterized in that: A power source (18) and a warning broadcast (19) are provided between two mutually opposite mounting rings (5); the mounting ring (5), the power source (18) and the warning broadcast (19) are connected by a wire (20); when the mounting rings (5) on both sides are in contact, the power source (18) and the warning broadcast (19) are electrically connected to emit a warning sound.

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