Fireproof and explosion-proof cable

Abstract

A fireproof and explosion-proof cable disclosed by the present invention comprises a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, a filling layer, a belting layer, an armor layer and an outer sheath, the outer wall of the belting layer is sleeved with an isolating layer, the outer wall of the isolating layer is sleeved with a protective layer, and multiple groups of isolating layers and multiple groups of protective layers are arranged and are equidistantly distributed along the length direction of the cable. Through the arrangement of the protection layer, when the temperature around the outer sheath is greatly increased due to a fire, the generated high temperature can be absorbed by the expanded graphite in the first expansion chamber, and the expanded graphite expands to enable the first expansion chamber to drive the concave block to move towards the convex block, so that the vent hole and the communication hole are staggered and blocked to form the heat insulation protection layer; external high temperature is prevented from entering the cable through the vent holes and the communication holes, the high temperature is prevented from entering the guide core, the guide core is prevented from being excessively heated, short circuit is caused, and even the danger of explosion occurs, so that the safety and the service life of the cable are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more specifically, to a fireproof and explosion-proof cable. Background Art

[0002] With the acceleration of the industrialization and urbanization processes, the demand for the safety and reliability of power and signal transmission systems is increasing day by day. In high-risk environments such as petrochemical, mining, power energy, and rail transit, cables not only need to meet basic electrical conductivity requirements but also possess the ability to maintain functional integrity under extreme conditions (such as high temperature, flame, explosion shock, etc.). The deficiencies of traditional cables in fireproof and explosion-proof performance have become potential hidden dangers for major safety accidents. Therefore, the research and development of fireproof and explosion-proof cables have become an important direction in the cable field.

[0003] Chinese Patent with application number CN201610777547.1 discloses a DC intertripping fireproof control cable for rail transit, which relates to the field of cables for rail transit. The cable includes a cable core unit protection layer, inside which there are 5 - 8 cable core units, and inside each cable core unit, there are an even number of cable cores; the cable core unit protection layer and each cable core unit are filled with filling materials; each cable core includes a cable core protection layer and a conductor located inside the cable core protection layer; the cable core protection layer includes a fire-resistant layer, an insulating layer, and an isolating layer arranged in sequence from the inside to the outside; the cable core unit protection layer includes a fire-separating layer, an inner protection layer, an armored layer, and an outer protection layer arranged in sequence from the inside to the outside. The present invention can greatly enhance the fire resistance, impulse voltage resistance, mechanical damage resistance, explosion-proof, electromagnetic interference prevention, mechanical vibration resistance, overload resistance, high temperature resistance, corrosion resistance, etc. of the cable; the present invention can meet relatively high laying conditions and operating environment conditions and is suitable for popularization.

[0004] Although the above invention can meet relatively high laying conditions and operating environment conditions, during long-term power supply, since the heat generated around the conductor cannot be timely conducted to the outside of the cable, the temperature inside the cable is relatively high, which may cause a fire hazard during the use of the cable, thus affecting the use safety of the cable and shortening its service life at the same time; when a fire occurs, the temperature around the cable will rise significantly, and the high temperature will be transmitted into the conductor core, causing the conductor core to overheat, leading to a short circuit and even an explosion hazard.

[0005] Therefore, in order to solve the above problems, a fireproof and explosion-proof cable is needed. Summary of the Invention

[0006] The object of the present invention is to provide a fireproof and explosion-proof cable, aiming to solve the problem that during the long-term power supply process of the cable, since the heat generated around the conductor cannot be timely conducted to the outside of the cable, the temperature inside the cable is relatively high, which may cause a fire hazard during the use of the cable, thus affecting the use safety of the cable and shortening the service life of the cable at the same time; when a fire occurs, the temperature around the cable will rise significantly, and the generated high temperature will be transmitted into the conducting core, causing the conducting core to overheat, leading to a short circuit and even an explosion hazard.

[0007] To achieve the above object, the present invention provides the following technical solution: A fireproof and explosion-proof cable includes a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, a filling layer, a tape layer, an armor layer and an outer sheath. An isolation layer is sleeved on the outer wall of the tape layer, and a protection layer is sleeved on the outer wall of the isolation layer. Both the isolation layer and the protection layer are provided with multiple groups and are equally spaced along the length direction of the cable.

[0008] The isolation layer includes a first expansion chamber. A plurality of first expansion chambers are provided and are equally spaced along the circumference on the outer wall of the tape layer. Each first expansion chamber is filled with a thermally expandable gas. One side of each first expansion chamber is fixedly connected with a first cross block, and the other side of each first expansion chamber is fixedly connected with a second cross block. Each second cross block is fixedly connected to the outer wall of the tape layer, and each first cross block is cross-slidingly connected to the corresponding second cross block.

[0009] Preferably, a plurality of first ventilation grooves evenly distributed along the length direction of the cable are formed through the outer wall of each first cross block. A limiting groove is formed on the outer wall of the first cross block between every two adjacent first ventilation grooves. A plurality of second ventilation grooves with the same number and corresponding positions as the first ventilation grooves are formed through the outer wall of each second cross block.

[0010] Preferably, the protection layer includes a second expansion chamber provided on the outer wall of the isolation layer. The second expansion chamber has the same number and corresponding positions as the first expansion chamber. Each second expansion chamber is filled with expanded graphite. One end of each second expansion chamber close to the first cross block is fixedly connected with a protruding block, and each protruding block is fixedly connected to the inner wall of the armor layer. One end of each second expansion chamber close to the second cross block is fixedly connected with a recessed block, and each recessed block can be slidably inserted into the corresponding protruding block.

[0011] Preferably, both sides of the insertion end of each protruding block are fixedly connected with a plurality of sliding blocks symmetrically arranged and equally spaced along the length direction of the cable. A plurality of ventilation holes equally spaced are formed in the insertion end of each protruding block.

[0012] Preferably, on both sides of each insertion end of the recessed block, sliding grooves with the same number and corresponding positions as the sliding blocks are symmetrically formed. Each sliding block is slidably connected in the corresponding sliding groove, and through holes with the same number and corresponding positions as the ventilation holes are formed through the outer wall of each recessed block.

[0013] Preferably, on one side of each recessed block close to the first cross block, limiting blocks with the same number and corresponding positions as the limiting grooves on the corresponding first cross block are fixedly connected. Each limiting block is slidably connected in the corresponding limiting groove.

[0014] Preferably, when the conductor continuously operates and generates heat, the thermally expanded gas in the first expansion chamber absorbs the heat dissipated by the conductor and expands. The expansion of the first expansion chamber squeezes the first cross block to move towards the second cross block. When the first cross block is squeezed by the first expansion chamber and moves to the limit position of the second cross block, the first ventilation groove and the second ventilation groove communicate with each other.

[0015] Preferably, when the first cross block moves towards the second cross block, the limiting groove on the outer wall of the first cross block drives the recessed block to move through the cooperation with the corresponding limiting block. When the first cross block moves to the limit position towards the second cross block, the ventilation hole and the through hole communicate with each other.

[0016] Preferably, when the high temperature outside the outer sheath enters the cable interior, the high temperature is absorbed by the expanded graphite in the first expansion chamber. After the expanded graphite expands, it causes the first expansion chamber to drive the recessed block to move towards the protruding block direction, causing the ventilation hole and the through hole to be staggered from each other.

[0017] Preferably, the insulating layer is cross-linked polyethylene and the outer sheath is polyvinyl chloride, both of which are flame-retardant and wear-resistant materials.

[0018] The beneficial effects of the present invention are:

[0019] 1. Through the setting of the isolation layer in the present invention, when the conductor continuously operates and generates heat, the heat will enter the first expansion chamber. The heat-expanded gas absorbs the heat and causes the first expansion chamber to expand, which will drive the first cross-block to move towards the second cross-block. When the first cross-block moves, the limiting groove on the outer wall of the first cross-block will drive the recessed block to move through the cooperation with the corresponding limiting block. When the first cross-block moves to the extreme position, the first ventilation groove and the second ventilation groove will communicate with each other. When the recessed block moves to the extreme position, the ventilation hole and the communication hole will communicate with each other. At this time, the heat generated by the conductor can be discharged through the first ventilation groove, the second ventilation groove, the ventilation hole, and the communication hole, which can timely discharge the heat generated around the conductor, prevent the danger of fire caused by the inability to timely discharge the high temperature inside the cable, and thus improve the performance and service life of the cable.

[0020] 2. Through the setting of the protective layer in the present invention, when a fire occurs and the temperature around the outer sheath rises significantly, the generated high temperature will be absorbed by the expanded graphite in the first expansion chamber. After the expanded graphite expands, the first expansion chamber will drive the recessed block to move towards the protruding block direction, making the ventilation hole and the communication hole stagger and block, forming a heat insulation protective layer, preventing the external high temperature from entering the cable interior through the ventilation hole and the communication hole, preventing the high temperature from being transmitted to the conductor core, causing the conductor core to overheat, leading to a short circuit, and even the danger of explosion, thereby improving the safety and service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structural distribution of the protective layer of the present invention;

[0023] Figure 3 It is a cross-sectional view of the staggered structure of the first ventilation groove, the second ventilation groove, the ventilation hole, and the communication hole of the present invention;

[0024] Figure 4 It is a cross-sectional view of the communicating structure of the first ventilation groove, the second ventilation groove, the ventilation hole, and the communication hole of the present invention;

[0025] Figure 5 It is a schematic diagram of the staggered structure of the first cross-block and the second cross-block of the present invention;

[0026] Figure 6 It is a cross-sectional view of the structure of the limiting groove and the limiting block of the present invention;

[0027] Figure 7 It is a schematic diagram of the exploded structure of the first cross-block and the second cross-block of the present invention;

[0028] Figure 8 It is a schematic diagram of the exploded structure of the protruding block and the recessed block of the present invention;

[0029] Figure 9 This is a cross-sectional view of the explosion structure of the protruding block and the recessed block of the present invention.

[0030] The reference numerals are: 11, conductor; 12, inner shielding layer; 13, insulating layer; 14, outer shielding layer; 15, filling layer; 16, tape layer; 17, armor layer; 18, outer sheath; 2, isolation layer; 21, first expansion chamber; 22, first cross block; 23, second cross block; 24, first ventilation groove; 25, limiting groove; 26, second ventilation groove; 3, protective layer; 31, second expansion chamber; 32, protruding block; 33, recessed block; 34, sliding block; 35, ventilation hole; 36, sliding groove; 37, communication hole; 38, limiting block. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1

[0033] During the long-term power supply of the cable, since the heat generated around the conductor cannot be timely conducted to the outside of the cable, the temperature inside the cable is relatively high, which may cause a fire hazard during the use of the cable, thereby affecting the use safety of the cable and shortening the service life of the cable at the same time.

[0034] As Figures 1 to 4 shown, a fireproof and explosion-proof cable according to an embodiment of the present invention includes a conductor 11, an inner shielding layer 12, an insulating layer 13, an outer shielding layer 14, a filling layer 15, a tape layer 16, an armor layer 17 and an outer sheath 18. An isolation layer 2 is sleeved on the outer wall of the tape layer 16, and a protective layer 3 is sleeved on the outer wall of the isolation layer 2. Both the isolation layer 2 and the protective layer 3 are provided with multiple groups and are equidistantly distributed along the length direction of the cable.

[0035] As Figure 3 and Figure 4 shown, the isolation layer 2 includes a first expansion chamber 21. A plurality of first expansion chambers 21 are provided and are equidistantly distributed along the circumference on the outer wall of the tape layer 16. Each first expansion chamber 21 is filled with a thermally expandable gas. One side of each first expansion chamber 21 is fixedly connected with a first cross block 22, and the other side of each first expansion chamber 21 is fixedly connected with a second cross block 23. Each second cross block 23 is fixedly connected to the outer wall of the tape layer 16, and each first cross block 22 is cross-slidingly connected to the corresponding second cross block 23.

[0036] By arranging thermally expandable gas in the first expansion chamber 21, when the thermally expandable gas absorbs heat and expands, the first expansion chamber 21 will expand, and the expansion of the first expansion chamber 21 will push the first cross block 22 to move towards the second cross block 23.

[0037] As Figures 5 to 7 shown, a plurality of first ventilation grooves 24 evenly distributed along the length direction of the cable are formed through the outer wall of each first cross block 22, and a limiting groove 25 is formed in the outer wall of the first cross block 22 corresponding to each adjacent pair of the first ventilation grooves 24. A plurality of second ventilation grooves 26 with the same number and corresponding positions as the first ventilation grooves 24 are formed through the outer wall of each second cross block 23.

[0038] When the first cross block 22 moves to the extreme position of the second cross block 23, the first ventilation groove 24 and the second ventilation groove 26 will communicate with each other.

[0039] As Figure 3 and Figure 4 shown, the protective layer 3 includes a second expansion chamber 31 provided on the outer wall of the isolation layer 2. The second expansion chamber 31 has the same number and corresponding positions as the first expansion chamber 21. A protruding block 32 is fixedly connected to one end of each second expansion chamber 31 close to the first cross block 22, and each protruding block 32 is fixedly connected to the inner wall of the armor layer 17. A recessed block 33 is fixedly connected to one end of each second expansion chamber 31 close to the second cross block 23, and each recessed block 33 can be slidably inserted into the corresponding protruding block 32.

[0040] As Figures 6 to 9 shown, a plurality of sliding blocks 34 evenly distributed at equal intervals and symmetrically arranged along the length direction of the cable are fixedly connected to both sides of the insertion end of each protruding block 32. A plurality of ventilation holes 35 are formed at equal intervals in the insertion end of each protruding block 32. Sliding grooves 36 with the same number and corresponding positions as the sliding blocks 34 are symmetrically formed on both sides of the insertion end of each recessed block 33. Each sliding block 34 is slidably connected in the corresponding sliding groove 36. A plurality of communication holes 37 with the same number and corresponding positions as the ventilation holes 35 are formed through the outer wall of each recessed block 33. A limiting block 38 with the same number and corresponding positions as the limiting grooves 25 on the corresponding first cross block 22 is fixedly connected to one side of each recessed block 33 close to the first cross block 22. Each limiting block 38 is slidably connected in the corresponding limiting groove 25.

[0041] When the first cross block 22 moves, the limiting groove 25 on the outer wall of the first cross block 22 will drive the recessed block 33 to move through the cooperation with the corresponding limiting block 38. When the first cross block 22 moves to the extreme position, the first ventilation groove 24 and the second ventilation groove 26 will communicate with each other. When the recessed block 33 moves to the extreme position, the ventilation hole 35 and the communication hole 37 will communicate with each other.

[0042] As Figures 1 to 9 shown, when the conductor 11 continuously operates and generates heat, the thermally expandable gas in the first expansion chamber 21 absorbs the heat dissipated by the conductor 11 and expands. The expansion of the first expansion chamber 21 squeezes the first cross-block 22 to move towards the second cross-block 23. When the first cross-block 22 is squeezed by the first expansion chamber 21 and moves to the limit position of the second cross-block 23, the first ventilation groove 24 and the second ventilation groove 26 will communicate with each other. When the first cross-block 22 moves towards the second cross-block 23, the limiting groove 25 on the outer wall of the first cross-block 22 will drive the recessed block 33 to move through the cooperation with the corresponding limiting block 38. When the first cross-block 22 moves to the limit position towards the second cross-block 23, the ventilation hole 35 and the communication hole 37 communicate with each other.

[0043] The insulating layer 13 is made of cross-linked polyethylene, and the outer sheath 18 is made of polyvinyl chloride, both of which are flame-retardant and wear-resistant materials.

[0044] During specific use, when the conductor 11 continuously operates and generates heat, the heat will spread around, and the heat will enter the first expansion chamber 21. The first expansion chamber 21 is filled with thermally expandable gas, and the absorption of heat by the thermally expandable gas will cause the first expansion chamber 21 to expand, which will drive the first cross-block 22 to move towards the second cross-block 23. When the first cross-block 22 moves, the limiting groove 25 on the outer wall of the first cross-block 22 will drive the recessed block 33 to move through the cooperation with the corresponding limiting block 38. When the first cross-block 22 moves to the limit position, the first ventilation groove 24 and the second ventilation groove 26 will communicate with each other. When the recessed block 33 moves to the limit position, the ventilation hole 35 and the communication hole 37 will communicate with each other. At this time, the heat generated by the conductor 11 can be discharged through the first ventilation groove 24, the second ventilation groove 26, the ventilation hole 35, and the communication hole 37.

[0045] In summary, through the setting of the isolation layer 2, when the conductor 11 continuously operates and generates heat, the heat will enter the first expansion chamber 21. The absorption of heat by the thermally expandable gas will cause the first expansion chamber 21 to expand, which will drive the first cross-block 22 to move towards the second cross-block 23. When the first cross-block 22 moves, the limiting groove 25 on the outer wall of the first cross-block 22 will drive the recessed block 33 to move through the cooperation with the corresponding limiting block 38. When the first cross-block 22 moves to the limit position, the first ventilation groove 24 and the second ventilation groove 26 will communicate with each other. When the recessed block 33 moves to the limit position, the ventilation hole 35 and the communication hole 37 will communicate with each other. At this time, the heat generated by the conductor 11 can be discharged through the first ventilation groove 24, the second ventilation groove 26, the ventilation hole 35, and the communication hole 37, which can timely discharge the heat generated around the conductor, prevent the danger of fire caused by the inability to timely discharge the high temperature inside the cable, and thus improve the performance and service life of the cable.

[0046] Embodiment 2

[0047] When a fire occurs, the temperature around the cable will increase significantly. The high temperature generated will be transmitted to the conductor core, causing the conductor core to overheat, which may cause a short circuit or even an explosion. Therefore, this embodiment improves the device described in the above embodiment.

[0048] like Figure 3 and Figure 4 As shown, the protective layer 3 includes a second expansion chamber 31 arranged on the outer wall of the isolation layer 2, the second expansion chamber 31 is the same in number and in position as the first expansion chamber 21, each second expansion chamber 31 is filled with expanded graphite, and each second expansion chamber 31 is fixedly connected to a protruding block 32 at one end close to the first cross block 22, each protruding block 32 is fixedly connected to the inner wall of the armor layer 17, and each second expansion chamber 31 is fixedly connected to a recessed block 33 at one end close to the second cross block 23, and each recessed block 33 can be slidably connected with the corresponding protruding block 32.

[0049] like Figures 6 to 9 As shown, both sides of the plug-in end of each protruding block 32 are fixedly connected with a plurality of sliding blocks 34 equidistantly distributed and symmetrically arranged along the length direction of the cable, and the plug-in end of each protruding block 32 is provided with a plurality of equidistantly distributed ventilation holes 35, and both sides of the insertion end of each recessed block 33 are symmetrically provided with sliding grooves 36 which are the same in number and corresponding in position as the sliding blocks 34, and each sliding block 34 is slidably connected in the corresponding sliding groove 36, and the outer wall of each recessed block 33 is penetrated with connecting holes 37 which are the same in number and corresponding in position as the ventilation holes 35, and the side of each recessed block 33 close to the first cross block 22 is fixedly connected with a limit block 38 which is the same in number and corresponding in position as the upper limit groove 25 of the corresponding first cross block 22, and each limit block 38 is slidably connected in the corresponding limit groove 25.

[0050] like Figures 3 to 9 As shown, when the high temperature outside the outer sheath 18 enters the interior of the cable, the high temperature will be absorbed by the expanded graphite in the first expansion chamber 21. After the expanded graphite expands, the first expansion chamber 21 will drive the recessed block 33 to move toward the protruding block 32, so that the vent hole 35 and the connecting hole 37 are staggered with each other.

[0051] During specific use, when a fire occurs and the temperature around the outer sheath 18 rises significantly, the generated high temperature will enter the interior of the cable through the outer sheath 18, and the high temperature will be absorbed by the expanded graphite in the first expansion chamber 21, causing the expanded graphite to expand. After the expanded graphite expands, the first expansion chamber 21 will drive the recessed block 33 to move toward the protruding block 32, so that the vents 35 and the connecting holes 37 are blocked alternately, forming a heat-insulating protective layer to prevent the external high temperature from entering the interior of the cable through the vents 35 and the connecting holes 37.

[0052] It should be noted that since the fire temperature is much higher than the temperature generated by the conductor 11, during a fire, the high temperature will be absorbed by the expanded graphite in the first expansion chamber 21 and expand, causing the ventilation holes 35 and the communication holes 37 to be staggered and blocked, and the ventilation holes 35 and the communication holes 37 will not be connected due to the temperature generated by the conductor 11.

[0053] In summary, through the setting of the protective layer 3, when a fire causes a significant increase in the temperature around the outer sheath 18, the generated high temperature will be absorbed by the expanded graphite in the first expansion chamber 21. After the expanded graphite expands, the first expansion chamber 21 will drive the concave block 33 to move towards the convex block 32, causing the ventilation holes 35 and the communication holes 37 to be staggered and blocked, forming a heat insulation protective layer to prevent the external high temperature from entering the cable through the ventilation holes 35 and the communication holes 37, preventing the high temperature from being transmitted to the conductor core, causing the conductor core to overheat, triggering a short circuit, and even posing a risk of explosion, thereby improving the safety and service life of the cable.

[0054] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fireproof and explosion-proof cable, comprising a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, a filling layer, a tape layer, an armor layer and an outer sheath, characterized in that: The outer wall of the tape layer is covered with an isolation layer, and the outer wall of the isolation layer is covered with a protective layer. The isolation layer and the protective layer are both provided with multiple groups and are equidistantly distributed along the length direction of the cable; The isolation layer includes a first expansion chamber, and the first expansion chamber is provided with a plurality of first expansion chambers which are equidistantly distributed along the circumference on the outer wall of the wrapping layer, each of the first expansion chambers is filled with hot expansion gas, one side of each of the first expansion chambers is fixedly connected to a first cross block, the other side of each of the first expansion chambers is fixedly connected to a second cross block, each of the second cross blocks is fixedly connected to the outer wall of the wrapping layer, and each of the first cross blocks is cross-slidably connected to the corresponding second cross block.

2. The fireproof and explosion-proof cable according to claim 1, characterized in that: The outer wall of each of the first cross blocks is penetrated by a plurality of first ventilation grooves evenly distributed along the length direction of the cable, a limiting groove is provided on the outer wall of the corresponding first cross block between every two adjacent first ventilation grooves, and the outer wall of each of the second cross blocks is penetrated by second ventilation grooves which are the same in number and corresponding in position as the first ventilation grooves.

3. A fireproof and explosion-proof cable according to claim 2, characterized in that: The protective layer includes a second expansion chamber arranged on the outer wall of the isolation layer, the second expansion chambers are the same in number and in corresponding positions as the first expansion chambers, each of the second expansion chambers is filled with expanded graphite, each of the second expansion chambers is fixedly connected to a protruding block at one end close to the first cross block, each of the protruding blocks is fixedly connected to the inner wall of the armor layer, and each of the second expansion chambers is fixedly connected to a recessed block at one end close to the second cross block, and each of the recessed blocks can be slidably connected to the corresponding protruding block.

4. The fireproof and explosion-proof cable according to claim 3, characterized in that: Both sides of the plug-in end of each protruding block are fixedly connected with a plurality of sliding blocks which are evenly distributed and symmetrically arranged along the length direction of the cable, and the plug-in end of each protruding block is provided with a plurality of evenly distributed ventilation holes.

5. The fireproof and explosion-proof cable according to claim 4, characterized in that: Both sides of the insertion end of each recessed block are symmetrically provided with sliding grooves of the same number and corresponding positions as the sliding blocks, each sliding block is slidably connected in the corresponding sliding groove, and the outer wall of each recessed block is penetrated by connecting holes of the same number and corresponding positions as the ventilation holes.

6. The fireproof and explosion-proof cable according to claim 5, characterized in that: A side of each of the recessed blocks close to the first cross block is fixedly connected with a limiting block having the same number and corresponding position as the limiting grooves on the corresponding first cross block, and each of the limiting blocks is slidably connected in the corresponding limiting groove.

7. The fireproof and explosion-proof cable according to claim 6, characterized in that: When the conductor continues to run and generate heat, the hot expansion gas in the first expansion chamber will absorb the heat dissipated by the conductor and expand. The expansion of the first expansion chamber will squeeze the first cross block to move toward the second cross block. When the first cross block is squeezed by the first expansion chamber and moves to the extreme position of the second cross block, the first ventilation groove and the second ventilation groove are connected to each other.

8. The fireproof and explosion-proof cable according to claim 7, characterized in that: When the first cross block moves toward the second cross block, the limit groove on the outer wall of the first cross block will drive the recessed block to move by cooperating with the corresponding limit block. When the first cross block moves to the extreme position toward the second cross block, the vent hole and the connecting hole are connected to each other.

9. The fireproof and explosion-proof cable according to claim 8, characterized in that: When the high temperature outside the outer sheath enters the cable, the high temperature will be absorbed by the expanded graphite in the first expansion chamber. After the expanded graphite expands, the first expansion chamber will drive the recessed block to move toward the protruding block, so that the vent hole and the connecting hole are staggered.

10. The fireproof and explosion-proof cable according to claim 9, characterized in that: The insulating layer is made of cross-linked polyethylene and the outer sheath is made of polyvinyl chloride, both of which are flame-retardant and wear-resistant materials.

Images