CN114974714A

CN114974714A - High-efficient radiating fire prevention medium voltage cable

Info

Publication number: CN114974714A
Application number: CN202210627235.8A
Authority: CN
Inventors: 刘继隆; 刘少强; 马刚; 马孜燕; 袁忠; 郑云鹰
Original assignee: Xinjiang Zhongchao New Energy Electric Power Technology Co ltd
Current assignee: Xinjiang Zhongchao New Energy Electric Power Technology Co ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2022-08-30

Abstract

The invention discloses a high-efficiency heat-dissipation fireproof medium-voltage cable, belonging to the field of cables, which can improve the efficiency of dissipating heat inside the cable outwards under normal conditions and reduce the influence of external high temperature on an internal copper wire during firing, a plurality of control bins are embedded inside a fireproof insulating skin, and metal sheets extending to the outer side of the fireproof insulating skin are fixedly connected with a valve block inside the control bins, so that the heat generated by the working of the copper wire is conveyed outwards, the high-efficiency heat dissipation of the device under normal working is ensured, meanwhile, the valve block is connected inside the control bins in a sliding manner, and liquid heat-conducting silicone grease is filled inside the control bins, so that the exposed metal sheets can be pulled back to the inside of the control bins under flame roasting, and the influence of the metal sheets still exposed outside on the device during firing is avoided, the working stability of the device is effectively guaranteed.

Description

High-efficient radiating fire prevention medium voltage cable

Technical Field

The invention relates to the field of cables, in particular to a fireproof medium-voltage cable with efficient heat dissipation.

Background

The fireproof medium-voltage cable is a power transmission cable with a certain fireproof and combustion-resistant performance and a transmission voltage range between 6KV and 33KV, is generally applied to circuit system construction in the fields of petrifaction, transportation, wastewater treatment, food processing and the like, and is one of cable types which are important in the prior art.

Fireproof medium voltage cable among the prior art, it mainly realizes the fire prevention fire resistance through the parcel at the outmost thick high temperature resistant rubber, receives the influence on thick rubber layer, leads to the inside and outside heat transfer of fireproof medium voltage cable in daily use to be obstructed, and the heat that the cable inside conductor during operation produced is difficult to outside transmission dissipation fast, leads to the inside temperature of cable higher usually to make fireproof medium voltage cable's electrically conductive transmission efficiency reduce.

To this end, we propose a fireproof medium voltage cable with high heat dissipation efficiency to solve some of the above-mentioned problems in the prior art.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a high-efficiency heat-dissipation fireproof medium-voltage cable, which can improve the efficiency of dissipating heat inside the cable outwards in a normal state and reduce the influence of external high temperature on an internal copper wire in a fire, a plurality of control bins are embedded inside a fireproof insulating skin, and metal sheets extending to the outer side of the fireproof insulating skin are fixedly connected with a valve block inside the control bins, so that the heat generated by the working of the copper wire is conveyed outwards, the high-efficiency heat dissipation of the device in the normal working state is ensured, meanwhile, the valve block is connected inside the control bins in a sliding manner, and liquid heat-conducting silicone grease is filled inside the control bins, under the condition of flame roasting, the valve block is pushed by the vaporization of water inside the liquid heat-conducting silicone grease, the exposed metal sheets can be pulled back to the inside of the control bins, and the influence of the exposed metal sheets on the device in the fire is avoided, the working stability of the device is effectively guaranteed.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A fireproof medium-voltage cable with efficient heat dissipation comprises a plurality of groups of copper conductors arranged at the middle position in a surrounding mode, wherein inner insulation covers wrap the outer sides of the plurality of groups of copper conductors, inner metal pipes are sleeved on the outer sides of the inner insulation covers together, and fireproof insulation covers wrap the outer sides of the inner metal pipes tightly;

the inside of fire-resistant insulation skin evenly inlays and has a plurality of control storehouses, and fixed mounting has the interface that flushes mutually with fire-resistant insulation skin external surface on the surface in control storehouse, and the inside sliding connection in control storehouse has the valve piece, and fixedly connected with activity is inserted and is established the inside sheetmetal of interface on the outer end wall of valve piece, and the inside one side packing that is close to in the sheetmetal in control storehouse has liquid heat conduction silicone grease.

Furthermore, four groups of copper wires are arranged, and the four groups of copper wires are mutually wound in a spiral structure.

Furthermore, the middle positions of the four inner insulation skins are inserted with separation frames which are arranged in a spiral structure, and the cross sections of the separation frames are arranged in a cross structure.

Furthermore, the section of the metal inner tube is set to be a reciprocating S-shaped curve structure, aluminum foils are uniformly attached to the inner end wall of the metal inner tube, and air bags are filled in the inner and outer concave parts of the metal inner tube.

Furthermore, the inner end wall of the fireproof insulation layer is covered with a wire connecting layer, and the wire connecting layer is formed by interweaving the fireproof fibers which are staggered with each other.

Furthermore, the outer end wall of the control bin close to one side of the copper wire is attached to the outer surface of the metal inner tube, and the control bin is of an arc-shaped structure.

Furthermore, a plurality of control cabins positioned on the same horizontal plane are distributed in the fireproof insulating skin in a surrounding mode, and a plurality of control cabins of the upper layer and the lower layer are arranged in a mutually staggered mode.

Furthermore, the shape of the metal sheet is a sheet-shaped structure, and the outer side size of the metal sheet is matched with the inner size of the interface.

Furthermore, one end of the outer side of the metal sheet is fixedly provided with high-temperature resistant rubber.

Further, the two sides of the high-temperature-resistant rubber are arranged to be of an outward inclined structure, and the size of the high-temperature-resistant rubber close to one side of the metal sheet is smaller than that of the high-temperature-resistant rubber far away from one side of the metal sheet.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) according to the scheme, the control bins are embedded in the fire-resistant insulating skin, the metal sheets extending to the outer side of the fire-resistant insulating skin are fixedly connected with the valve blocks in the control bins, so that heat generated by the operation of copper wires can be conveyed outwards, the high-efficiency heat dissipation performance of the device under normal operation can be guaranteed, meanwhile, the valve blocks are connected in the control bins in a sliding manner, liquid heat-conducting silicone grease is filled in the control bins, under the condition of burning of flames, the exposed metal sheets can be pulled back into the control bins by means of the promotion of the vaporization of water in the liquid heat-conducting silicone grease on the valve blocks, the influence on the device caused by the fact that the metal sheets are still exposed outside when the fire is started is avoided, the working stability of the device is effectively guaranteed, the liquid heat-conducting silicone grease is filled in the control bins, the heat exchange efficiency through the control bins can be guaranteed, and the device is in a dry state after the water in the liquid heat-conducting silicone grease is evaporated, the heat conductivity is reduced, and the heat influence of external fire on the interior of the cable can be further reduced.

(2) Through setting up four group's copper conductor into the structure of the mutual winding of spiral type, can be so that four group's copper conductor intertwine, the structural strength of this cable has been promoted to a certain extent, install between four internal insulation skin through the separation frame that is the cross structure with the cross-section, can separate four group's copper conductor in independent space just, be favorable to reducing the mutual interference between four group's copper conductor, and simultaneously, with the help of the support of separation frame, can reduce four group's copper conductor and receive the probability of external extrusion dislocation, the effectual stability of guaranteeing in this cable use.

(3) Through laminating the aluminium foil on the inner wall of metal inner tube, can carry out the electromagnetism isolation protection to the copper conductor that inside is in operating condition, reduce the influence of external electromagnetism fluctuation to this cable, and simultaneously, establish the outside at a plurality of internal insulation skins through the metal inner tube cover that sets up the cross-section to reciprocal S type curve structure, can protect internal multiunit copper conductor, and ensure the bendability of this cable, through filling the gasbag in the inside and outside depressed part of metal inner tube, can be in the time of guaranteeing its bendability, effectual guarantee metal inner tube and internal insulation skin, laminating compactness between the fire-resistant insulation skin, the structural strength of this cable has been promoted to a certain extent.

(4) The silk thread connecting layer through with grid type structure covers on the inner end wall of fire-resistant insulating skin, when fire-resistant insulating skin receives external force, can connect with the help of the net with the single-point atress to dispersion on every side, can effectually promote the structural strength of fire-resistant insulating skin, has promoted fire-resistant insulating skin tensile resistance to a certain extent and has dragged the performance.

(5) The appearance through will controlling the storehouse sets up to the circular arc type structure for it laminates mutually with this cable cross-section appearance, has ensured the laminating nature of control storehouse and metal inner tube surface to a certain extent, laminates mutually through the surface with one side and the metal inner tube in the control storehouse, and the heat transfer effect between can effectual guarantee control storehouse and the metal inner tube, and then has promoted the effect of the inside and outside heat exchange of the device to a certain extent.

(6) Through will be located a plurality of control storehouse on same horizontal plane evenly around distribute inside fire-resistant insulating skin, be favorable to ensureing the homogeneity of the outside transmission of the inside heat of this cable, simultaneously, set up to crisscross setting each other through a plurality of control storehouse with adjacent two-layer from top to bottom, further ensured the heat transfer equilibrium to receive between the metal sheet from top to bottom when can avoiding this cable bending and block each other, be favorable to ensureing this cable construction stability.

(7) Through the outside size setting with the sheetmetal and the inside size of interface, can be effectual the connection leakproofness between guarantee sheetmetal and the interface, avoid the inside liquid heat conduction silicone grease in control storehouse to outwards reveal, simultaneously, set up to the thin slice type through the appearance with the sheetmetal, can effectively reduce its deformation degree that self expands when being heated, when avoiding on fire, interface and sheetmetal expand deformation simultaneously, lead to the sheetmetal to remove inconveniently, be favorable to guaranteeing the device stability when warping.

(8) Install on the outside one of sheetmetal through with high temperature resistant rubber, when the sheetmetal income to the inside back of interface, the high temperature resistant rubber shutoff is in the outside of interface, the influence of external high temperature to the sheetmetal has been reduced to a certain extent, set up to leaning out the structure through the both sides with high temperature resistant rubber, make high temperature resistant rubber keep away from one side size that the sheetmetal is less than its size that presses close to sheetmetal one side, thereby it is inside to make can closely insert the interface after the high temperature resistant rubber removes, and then carry out the shutoff to the interface, can further carry out the separation to external high temperature, be favorable to avoiding external high temperature inside the sheetmetal influence cable.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a front cross-sectional view of the present invention;

FIG. 4 is a schematic view of the structure at A in FIG. 3;

FIG. 5 is a top view of the present invention;

FIG. 6 is a top cross-sectional view of the present invention;

FIG. 7 is a schematic view of the structure at B in FIG. 6;

FIG. 8 is a schematic view of the structure of the inner insulating sheath according to the present invention;

FIG. 9 is a schematic view of the construction of the barrier frame of the present invention;

FIG. 10 is a schematic view of the structure of the metal inner tube of the present invention.

The reference numbers in the figures illustrate:

1. a copper wire; 101. an inner insulating skin; 102. a barrier frame; 103. a metal inner tube; 104. a refractory insulating skin; 2. a control cabin; 201. an interface; 202. a valve block; 203. a metal sheet; 204. high temperature resistant rubber; 205. liquid heat-conducting silicone grease.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-10, a high-efficient heat-dissipating fireproof medium-voltage cable includes a plurality of groups of copper conductors 1 arranged around a middle position, inner insulating covers 101 are respectively wrapped on outer sides of the plurality of groups of copper conductors 1, inner metal tubes 103 are commonly sleeved on outer sides of the plurality of inner insulating covers 101, and fireproof insulating covers 104 are tightly wrapped on outer sides of the inner metal tubes 103;

the inside of fire-resistant insulating skin 104 evenly inlays and has a plurality of control storehouses 2, fixed mounting has interface 201 that flushes mutually with fire-resistant insulating skin 104 surface on the surface in control storehouse 2, the inside sliding connection in control storehouse 2 has valve block 202, and fixedly connected with activity is inserted and is established the inside sheetmetal 203 of interface 201 on the outer end wall of valve block 202, the inside one side that is close to sheetmetal 203 in control storehouse 2 is filled with liquid heat conduction silicone grease 205.

Referring to fig. 6-7, when the device is used, power transmission is performed through a plurality of groups of copper wires 1 arranged at the innermost part, and in a normal state, the metal sheet 203 fixedly connected with the valve block 202 extends to the outer side of the interface 201, so that the inside of the refractory insulating sheath 104 of the device is communicated with the outside in a heat transmission manner, heat generated when the copper wires 1 work is transmitted to the control cabin 2 through the metal inner pipe 103, and is transmitted to the outside through the interface 201 and the metal sheet 203, and the internal heat dissipation effect of the device when the device works is effectively improved.

When a fire disaster happens to the working position of the device, the fire-resistant insulating skin 104 arranged on the outermost layer can effectively inhibit the flame from burning the device, meanwhile, under the influence of expansion and contraction of heat, the fire-resistant insulating skin is squeezed more tightly between the relatively sealed interface 201 and the metal sheet 203, when the flame burns and rises, water inside the liquid heat-conducting silicone grease 205 vaporizes, so that the valve block 202 is pushed by expansion, the valve block 202 moves inside the control cabin 2 after being pushed, the exposed metal sheet 203 is pulled into the control cabin 2, and even if the metal sheet 203 exposed outside is taken into the control cabin 2, the external high temperature can be prevented from being transmitted to the inside of a cable through the metal sheet 203, and the stability of the device under the flame is effectively guaranteed.

The plurality of inner insulating covers 101 are respectively sleeved on the outer side of each group of copper wires 1, so that a plurality of groups of copper wires 1 can be isolated, the working stability of the device can be guaranteed, the plurality of control cabins 2 are embedded in the fireproof insulating covers 104, the metal sheets 203 extending to the outer sides of the fireproof insulating covers 104 are fixedly connected with the valve blocks 202 in the control cabins 2, the heat generated by the working of the copper wires 1 can be conveyed outwards, the high-efficiency heat dissipation performance of the device under normal working can be guaranteed, meanwhile, the valve blocks 202 are connected in the control cabins 2 in a sliding mode, the liquid heat-conducting silicone grease 205 is filled in the control cabins 2, the valve blocks 202 are pushed by the vaporized moisture in the liquid heat-conducting silicone grease 205 under the condition of flame roasting, the exposed metal sheets 203 can be pulled back to the inside of the control cabins 2, and the influence on the device caused by the fact that the metal sheets 203 are still exposed outside during firing can be avoided, the effectual job stabilization who ensures the device fills liquid heat conduction silicone grease 205 inside control storehouse 2, is favorable to the guarantee to carry out the efficiency of heat exchange through control storehouse 2, and it is in dry state after the inside moisture evaporation of liquid heat conduction silicone grease 205, and heat conductivility reduces, can further reduce the external heat influence of firing to the cable inside.

Referring to fig. 1, four groups of copper wires 1 are arranged, the four groups of copper wires 1 are wound with each other in a spiral structure, and when the device works, the four groups of copper wires 1 are wound with each other in a spiral structure, so that the four groups of copper wires 1 are wound with each other, and the structural strength of the cable is improved to a certain extent.

Referring to fig. 1 and 9, the blocking frame 102 having the spiral structure is inserted into the middle positions of the four inner insulating covers 101, and the cross section of the blocking frame 102 is a cross structure, when the device works, the blocking frame 102 having the cross structure is installed between the four inner insulating covers 101, so that four groups of copper wires 1 can be exactly separated in independent spaces, which is beneficial to reducing mutual interference among the four groups of copper wires 1, and meanwhile, by means of the support of the blocking frame 102, the probability of dislocation of the four groups of copper wires 1 due to external extrusion can be reduced, and the stability of the cable in the using process can be effectively guaranteed.

Referring to fig. 3 and 10, the cross section of the metal inner tube 103 is set to be a reciprocating S-shaped curve structure, the inner end wall of the metal inner tube 103 is uniformly attached with an aluminum foil, the inner and outer concave parts of the metal inner tube 103 are filled with air bags, when the device works, the aluminum foil is attached to the inner end wall of the metal inner tube 103, so that the copper wires 1 in the working state can be electromagnetically isolated and protected, the influence of external electromagnetic fluctuation on the cable is reduced, meanwhile, the metal inner tube 103 with the cross section set to be the reciprocating S-shaped curve structure is sleeved outside a plurality of inner insulating covers 101, so that a plurality of groups of copper wires 1 inside can be protected, the flexibility of the cable is ensured, and the air bags are filled in the inner and outer concave parts of the metal inner tube 103, so that the flexibility of the metal inner tube 103 and the fitting tightness between the inner insulating covers 101 and the fireproof insulating covers 104 can be effectively ensured, the structural strength of the cable is improved to a certain extent.

The silk thread linkage has been covered on the terminal wall in the fire-resistant insulating skin 104, and the silk thread linkage interweaves through crisscross fire-resistant fibre and constitutes, the device during operation, the crisscross fire-resistant fibre interweaves into grid type structure, through covering the silk thread linkage of grid type structure on the terminal wall in fire-resistant insulating skin 104, when fire-resistant insulating skin 104 receives external force, can be with the help of grid connection with single-point atress to dispersion on every side, can effectual promotion fire-resistant insulating skin 104 structural strength, the anti tensile performance of fire-resistant insulating skin 104 has been promoted to a certain extent.

Please refer to fig. 3 and 4, the outer end wall of the control cabin 2 close to one side of the copper wire 1 is attached to the outer surface of the metal inner tube 103, the shape of the control cabin 2 is set to an arc structure, the device is in operation, the shape of the control cabin 2 is set to an arc structure, so that the control cabin 2 is attached to the outer surface of the cable section, the attachment of the control cabin 2 to the outer surface of the metal inner tube 103 is ensured to a certain extent, the outer surface of the metal inner tube 103 is attached to one side of the control cabin 2, the heat transfer effect between the control cabin 2 and the metal inner tube 103 can be effectively ensured, and further, the effect of the heat exchange inside and outside the device is improved to a certain extent.

Please refer to fig. 6, the plurality of control bins 2 located on the same horizontal plane surround the inside of the fire-resistant insulating sheath 104, the two adjacent control bins 2 on the same horizontal plane are arranged in a staggered manner, when the device works, the control bins 2 located on the same horizontal plane are uniformly distributed inside the fire-resistant insulating sheath 104 in a surrounding manner, which is beneficial to ensuring the uniformity of the heat quantity transferred outwards inside the cable, and meanwhile, the control bins 2 on the upper and lower adjacent layers are arranged in a staggered manner, so that the heat transfer balance is further ensured, and the situation that the upper and lower metal sheets 203 are blocked mutually when the cable is bent can be avoided, which is beneficial to ensuring the structural stability of the cable.

Please refer to fig. 2, the appearance of the metal sheet 203 is set to be a thin sheet structure, the outside dimension of the metal sheet 203 is matched with the inside dimension of the interface 201, the device is in operation, the outside dimension of the metal sheet 203 is set to be the inside dimension of the interface 201, the connection sealing performance between the metal sheet 203 and the interface 201 can be effectively ensured, the liquid heat-conducting silicone grease 205 inside the control bin 2 is prevented from leaking outwards, meanwhile, the appearance of the metal sheet 203 is set to be a thin sheet type, the self-expansion deformation degree of the metal sheet when the metal sheet is heated can be effectively reduced, when fire is avoided, the interface 201 and the metal sheet 203 expand and deform simultaneously, the metal sheet 203 is inconvenient to move, and the stability of the device during deformation is favorably ensured.

Referring to fig. 4, the high temperature resistant rubber 204 is fixedly mounted on one end of the outer side of the metal sheet 203, and when the device works, the high temperature resistant rubber 204 is mounted on one end of the outer side of the metal sheet 203, and after the metal sheet 203 is received in the interface 201, the high temperature resistant rubber 204 is blocked on the outer side of the interface 201, so that the influence of the external high temperature on the metal sheet 203 is reduced to a certain extent.

Please refer to fig. 7, two sides of the high temperature rubber 204 are set to be of an outward-inclined structure, the size of the high temperature rubber 204 close to one side of the metal sheet 203 is smaller than the size of the metal sheet 203 far away from the metal sheet 203, when the device works, the two sides of the high temperature rubber 204 are set to be of an outward-inclined structure, the size of one side of the high temperature rubber 204 far away from the metal sheet 203 is smaller than the size of one side of the metal sheet 203 close to the metal sheet 203, the high temperature rubber 204 can be tightly inserted into the interface 201 after moving, and then the interface 201 is plugged, so that the external high temperature can be further blocked, and the external high temperature is favorably avoided from influencing the inside of the cable through the metal sheet 203.

The above are merely preferred embodiments of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. The utility model provides a high-efficient radiating fire prevention medium voltage cable, includes that the encircleing sets up multiunit copper conductor (1) in intermediate position department, its characterized in that: inner insulating skins (101) are wrapped on the outer sides of the multiple groups of copper conductors (1), inner metal pipes (103) are sleeved on the outer sides of the inner insulating skins (101) together, and fireproof insulating skins (104) are tightly wrapped on the outer sides of the inner metal pipes (103);

the inside uniform mosaic of fire-resistant insulating skin (104) has a plurality of control storehouses (2), fixed mounting has interface (201) that flushes mutually with fire-resistant insulating skin (104) surface on the surface in control storehouse (2), the inside sliding connection of control storehouse (2) has valve piece (202), and fixedly connected with activity inserts sheetmetal (203) of establishing inside interface (201) on the outer end wall of valve piece (202), the inside one side packing that is close to sheetmetal (203) in control storehouse (2) has liquid heat conduction silicone grease (205).

2. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 1, wherein: the copper wires (1) are provided with four groups, and the four groups of copper wires (1) are mutually wound in a spiral structure.

3. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 2, wherein: and the middle positions of the four inner insulating skins (101) are inserted with the blocking frames (102) which are arranged in a spiral structure, and the cross sections of the blocking frames (102) are arranged in a cross structure.

4. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 1, wherein: the cross section of the metal inner tube (103) is set to be a reciprocating S-shaped curve structure, aluminum foils are uniformly attached to the inner end wall of the metal inner tube (103), and air bags are filled in the inner and outer concave parts of the metal inner tube (103).

5. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 1, wherein: the inner end wall of the fireproof insulation skin (104) is covered with a silk thread connecting layer, and the silk thread connecting layer is formed by interweaving mutually staggered fireproof fibers.

6. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 1, wherein: the outer end wall that control storehouse (2) are close to copper conductor (1) one side is laminated with the surface of metal inner tube (103) mutually, the appearance of control storehouse (2) sets up to the arc type structure.

7. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 1, wherein: the control bins (2) located on the same horizontal plane are distributed in the refractory insulating skin (104) in a surrounding mode, and the control bins (2) of the upper layer and the lower layer are arranged in a staggered mode.

8. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 1, wherein: the outer shape of the metal sheet (203) is a thin sheet structure, and the outer size of the metal sheet (203) is matched with the inner size of the interface (201).

9. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 8, wherein: and one end of the outer side of the metal sheet (203) is fixedly provided with high-temperature resistant rubber (204).

10. An efficient heat dissipating fire-resistant medium voltage cable as claimed in claim 9, wherein: the two sides of the high-temperature-resistant rubber (204) are arranged to be of an outward inclined structure, and the size of the high-temperature-resistant rubber (204) close to one side of the metal sheet (203) is smaller than that of the high-temperature-resistant rubber far away from one side of the metal sheet (203).