CN116153576B - High-flame-retardance flexible fireproof cable - Google Patents
High-flame-retardance flexible fireproof cable Download PDFInfo
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- CN116153576B CN116153576B CN202310423837.6A CN202310423837A CN116153576B CN 116153576 B CN116153576 B CN 116153576B CN 202310423837 A CN202310423837 A CN 202310423837A CN 116153576 B CN116153576 B CN 116153576B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/40—Insulated conductors or cables characterised by their form with arrangements for facilitating mounting or securing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
- H01B7/423—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation using a cooling fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The invention belongs to the technical field of cables, and particularly relates to a high-flame-retardance flexible fireproof cable; the cable comprises a filling layer, wherein a protective sleeve is arranged on the outer surface of the filling layer, a plurality of groups of inner cavities are uniformly arranged in the filling layer in an array manner, elastic annular pipes are arranged in the inner cavities, an insulating layer is arranged in the elastic annular pipes, and a cable core is arranged in the insulating layer; a central cavity is arranged in the filling layer, and mounting ring sleeves are arranged at the end parts of the two sides of the elastic ring pipe; the device has stronger self-adaptive adjustment capability, and effectively ensures the extrusion force applied by the insulating layer to the cable core, thereby ensuring the electrifying efficiency and electrifying stability of the cable core; meanwhile, the fixed-point cooling flame-retardant efficiency is better, the serious economic and safety losses are effectively avoided, the splicing length can be effectively ensured when the cable is spliced, the splicing efficiency is enhanced, the insulating layer on the outer surface of the cable core to be spliced can be thoroughly and effectively scraped, the operation is simple, and the precision is higher.
Description
Technical Field
The invention belongs to the technical field of cables, and particularly relates to a high-flame-retardance flexible fireproof cable.
Background
The cable is made of one or more mutually insulated conductors and an outer insulating protective layer, wires for transmitting power or information from one place to another, wherein the fire resistance is a central factor for detecting the quality of the cable.
The invention discloses an inorganic material high-flame-retardant fireproof cable, which comprises a plurality of cables, an inorganic material fireproof layer extruded on the cables and a flame-retardant outer sleeve sleeved on the inorganic material fireproof layer, wherein each cable consists of a copper conductor and a ceramic silicon rubber insulating layer extruded on the copper conductor; the fireproof cable has the advantages of simple structure and poor cooling and flame retarding performance.
The Chinese patent 2020103174015 discloses a fireproof cable, which comprises a cable outer coating layer, wherein a cable inner core wire is arranged in the cable outer coating layer, the cable inner core wire comprises a core wire protection layer and a cable core wire, and more than one elastic air bag sleeve is wrapped outside the cable inner core wire; the fireproof cable cannot correspondingly change along with the change of the internal temperature, so that the adaptability is poor, and the fireproof flame-retardant effect is poor.
In the prior art, when the temperature of the cable core inside the cable is increased, the surrounding temperature is synchronously driven to be increased, so that the insulating layer can expand and apply acting force to the cable core inside under the principle of thermal expansion and cold contraction, and the electrifying performance of the cable core is further reduced.
Meanwhile, when the temperature of the cable core is further increased and a fire disaster occurs, the cable core cannot be precisely positioned and cooled in the prior art, so that serious damage to the cable is caused.
When the cable is spliced, the insulating layer is adhered to the outer surface of the cable core by means of the self viscosity of the insulating layer, so that the stripping difficulty is increased, the electrifying performance of the cable core is affected, and the strength and durability of the cable are reduced.
Disclosure of Invention
The invention aims at the problems and provides a high-flame-retardance flexible fireproof cable which is used for solving the problems.
In order to achieve the above purpose, the present invention provides the following technical solutions: the high-flame-retardance flexible fireproof cable comprises a filling layer, wherein a protective sleeve is arranged on the outer surface of the filling layer, a plurality of groups of inner cavities are uniformly arranged in the filling layer in an array mode, elastic annular tubes are arranged in the inner cavities, an insulating layer is arranged in the elastic annular tubes, and cable cores are arranged in the insulating layer;
the inside of the filling layer is provided with a central cavity, the end parts of the two sides of the elastic ring pipe are respectively provided with a mounting ring sleeve, the ends of the mounting ring sleeves, which are far away from the insulating layer, are provided with movable grooves, the inside of each movable groove is connected with a sealing push plate in a sliding manner, and one side of each sealing push plate, which is close to the insulating layer, is provided with an insulating scraper;
a plurality of groups of heat dissipation grooves are uniformly arranged on the outer wall of the insulating layer in an array manner, an exhaust side cavity is formed between the inner wall of the mounting ring sleeve and the outer wall of the insulating layer, and the other end of the exhaust side cavity is communicated with a heat dissipation hole;
when the temperature of the cable core is increased, the expansion of the insulating layer is adaptively adjusted by the elastic ring pipe, and meanwhile, the fixed-point cooling and heat dissipation can be carried out; and the cable core can be subjected to fixed-point fire extinguishment when the temperature is further increased; when the cable is spliced, the insulating layer is scraped by the insulating scraper, so that the splicing efficiency is improved.
Further, the material of the filling layer is glass fiber inorganic matter, the elastic ring pipe is internally provided with stable gas, the material of the insulating layer is high silica glass fiber, the thermal expansion coefficient of the stable gas in the elastic ring pipe is smaller than that of the insulating layer, the material of the cable core is a plurality of copper wires, and the material of the protective sleeve is low-smoke halogen-free polyolefin; the materials of each structure are limited, so that the flexibility and the cooling and fire extinguishing performance of the cable are further improved.
Further, two side ends of the elastic ring pipe are provided with side communication holes, the other ends of the side communication holes penetrate through the mounting ring sleeve and are communicated with the movable groove, the outer surface of the elastic ring pipe is provided with an air pipe, and the other ends of the air pipes penetrate through the filling layer and are communicated with the central cavity; the circulation temporary storage of stable gas in the elastic ring pipe is realized by means of the ventilation pipeline.
Further, connecting springs are symmetrically arranged on the side walls of the central cavity, sealing sliding plates are arranged on the other sides of the connecting springs, a plurality of groups of pressure check valves are uniformly arranged in the sealing sliding plates in an array mode, the pressure check valves are provided with pressure preset values, the outer surfaces of the sealing sliding plates are in sealing sliding connection with the inner wall of the central cavity through sealing rings, a cooling cavity is formed between the sealing sliding plates and the inner wall of the central cavity, and coolant is arranged in the cooling cavity; when the temperature of the cable core further rises, the pressure one-way valve is opened, and the coolant reversely flows into the elastic ring pipe to perform fixed-point cooling and fire extinguishment.
Further, a plurality of groups of vertical grooves are uniformly arranged on the outer surfaces of the filling layer and the protective sleeve in an array manner, vertical rods are connected inside the vertical grooves in a sliding manner, a pressing alarm is arranged at one end, far away from the mounting ring sleeve, of each vertical rod, an elastic friction ring is arranged on the inner wall of each vertical groove, and the elastic friction rings are in elastic friction sliding connection with the side wall of each pressing alarm; meanwhile, when the temperature of the cable core is further increased, the pressing alarm slides out along the vertical groove and alarms by means of the pressing alarm.
Further, a vertical hole is cut at the bottom of the movable groove, the heat dissipation groove is communicated with the exhaust side cavity, one end of the insulating scraper, which is far away from the sealing push plate, penetrates through the vertical hole and is matched with the heat dissipation groove, and one end of the heat dissipation hole, which is far away from the exhaust side cavity, penetrates through the vertical rod and the pressing alarm and is communicated with the outside; the air in the heat dissipation groove is discharged along the exhaust side cavity and the vertical groove.
Further, the mounting ring sleeve is far away from the one end symmetry of elasticity ring canal is equipped with draw-in groove and fixture block respectively, the draw-in groove with fixture block assorted, same the draw-in groove of elasticity ring canal both sides with the position of fixture block is relative, and the concatenation of adjacent elasticity ring canal is realized to draw-in groove and fixture block joint.
Further, a limiting ring is arranged at the top of the inner side wall of the movable groove, the bottom of the limiting ring is matched with the top seal of the sealing push plate, and the outer wall of the sealing push plate is in sealing sliding connection with the inner wall of the movable groove through a sealing ring; further improving the sealability of movement.
Further, the bottom of the vertical rod is in sealing clamping connection with the top of the mounting ring sleeve, a reset spring is arranged at the top of the sealing push plate, and the top of the other end of the reset spring is fixedly connected with the bottom of the vertical rod; the vertical rod is matched with the reset spring to realize the sliding connection of the sealing push plate.
Further, the height value of the insulating scraper is larger than the thickness value of the insulating layer, the distance between the communicating side hole and the bottom in the movable groove is larger than the height value of the sealing push plate, and the volume between the sealing push plate and the bottom in the movable groove is smaller than the internal volume of the elastic ring pipe; when the cable is spliced, an insulating layer on the outer surface of the cable core is scraped by means of an insulating scraper.
Compared with the prior art, the invention has the following beneficial effects:
1. the cable is strong in durability, good in flexibility and good in outdoor wear resistance, the service life and the service adaptability of the cable are effectively improved, meanwhile, the cable is strong in insulation protection performance, high in flame retardance and fireproof performance, and the internal structure is uniformly and reliably arranged and high in strength.
2. According to the invention, by arranging the sealing push plate, the elastic ring pipe and other parts to be matched with each other, the self-adaptive adjusting capability of the device is stronger, and the extrusion force applied to the cable core by the insulating layer is effectively ensured, so that the electrifying efficiency and electrifying stability of the cable core are ensured; meanwhile, the fixed-point cooling flame-retardant efficiency is better, the accuracy is better, and great economic and safety losses are effectively avoided.
3. According to the invention, through the mutual matching of the insulating scraper, the radiating groove and other parts, the device can effectively ensure the splicing length when the cable is spliced, enhance the splicing efficiency, thoroughly and effectively scrape the insulating layer on the outer surface of the cable core to be spliced, and has the advantages of simple operation and higher precision.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic left-hand cross-sectional view of the present invention;
FIG. 3 is an enlarged schematic view of FIG. 1 at A;
FIG. 4 is an enlarged schematic view of FIG. 1 at B;
FIG. 5 is a schematic elevational cross-sectional view of the present invention;
FIG. 6 is an enlarged schematic view of FIG. 5 at C;
fig. 7 is an enlarged schematic view of fig. 5 at D.
In the figure: 1. a filling layer; 2. a protective sleeve; 3. an inner cavity; 4. an elastic collar; 5. an insulating layer; 6. a cable core; 7. a central cavity; 8. a connecting spring; 9. a sealing slide plate; 10. a pressure check valve; 11. a cooling chamber; 12. a ventilation duct; 13. a vertical groove; 14. a vertical rod; 15. pressing an alarm; 16. a heat discharging hole; 17. a mounting ring sleeve; 18. a clamping groove; 19. a clamping block; 20. an exhaust side chamber; 21. a side hole is communicated; 22. a heat sink; 23. a movable groove; 24. a return spring; 25. a sealing push plate; 26. an insulating scraper; 27. a vertical hole; 28. an elastic friction ring; 29. and a limiting ring.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First embodiment
As shown in fig. 1 and 2, a high fire-retardant flexible fireproof cable, including filling layer 1, the material of filling layer 1 is glass fiber inorganic matter, filling layer 1 not only can play fire-retardant effect to the cable, filling layer 1 can also improve the flexibility and the intensity of cable simultaneously, the surface of filling layer 1 is equipped with protective sheath 2, protective sheath 2's material is low smoke zero halogen polyolefin, protective sheath 2 possesses dampproofing and wear-resisting property, improve the durability and the environmental suitability of cable, the inside even array of filling layer 1 is equipped with multiunit inner chamber 3, the inside of inner chamber 3 all is equipped with elasticity ring canal 4, the inside of elasticity ring canal 4 is equipped with insulating layer 5, the material of insulating layer 5 is high silica glass fiber, insulating layer 5 possesses insulating effect, the inside of insulating layer 5 is equipped with cable core 6, the material of cable core 6 is many copper wires, consequently, wrap up the insulation to inside cable core 6 with the help of insulating layer 5, avoid inside cable core 6 to appear the short circuit outage and reduce the power transmission performance of cable.
The device wraps up insulating layer 5 with cable core 6 surface in the production process to wrap up insulating layer 5 to the cable core 6 of inside with the help of insulating layer 5, wrap up elastic loop 4 at insulating layer 5's surface simultaneously, elastic loop 4 realizes wrap up protection and elastic connection to insulating layer 5, later adds filling layer 1 at multiunit elastic loop 4's surface and forms the cable structure of completion, wraps up protective sheath 2 at filling layer 1's surface at last, and protective sheath 2's setting further improves the intensity and the wearability of cable, improves the service life of cable.
The cable is strong in durability, good in flexibility, good in outdoor wear resistance, high in insulation protection performance, high in flame retardance and fireproof performance, uniform and reliable in internal structure arrangement and high in strength, and the service life and the service adaptability of the cable are effectively improved.
Second embodiment
As shown in fig. 3 to 7, in actual use, due to the material of the insulating layer 5, when the current flowing in the cable core 6 increases or the cable core 6 is shorted, the heat generated by the cable core 6 increases, the temperature around the insulating layer 5 increases, the insulating layer 5 expands under the principle of expansion and contraction, the extrusion force applied to the cable core 6 increases, and the structure of the cable core 6 changes under the action of the extrusion force, thereby reducing the current performance of the cable core 6; when the external temperature is reduced and the heat generated by the cable core 6 is reduced, the temperature around the insulating layer 5 is reduced, so that the insulating layer 5 contracts under the principles of thermal expansion and cold contraction and is separated from the outer surface of the cable core 6, the insulating wrapping performance of the insulating layer 5 on the cable core 6 is reduced, and meanwhile, the insulating layer is contracted and rubbed with the inside of the filling layer 1 to cause the damage of the structure of the insulating layer 5; when the heat generated by the cable core 6 is continuously increased, the existing cables lack the effect of carrying out fixed-point heat dissipation and cooling on the cables, so that the heat dissipation efficiency of the cables is reduced, the normal power on of the inner cable core 6 is influenced, and the cables are even ignited; when the cable is required to be spliced, the adhesion strength of the insulating layer 5 and the cable core 6 is too high, so that the stripping difficulty of the insulating layer 5 is high, the insulating layer 5 is stripped layer by adopting manpower in the prior art, the stripping difficulty is high, the efficiency is low, and the strength and the electrifying performance of the subsequent cable splicing can be reduced by the part of the insulating layer 5 adhered to the outer surface of the cable core 6; therefore in order to solve the above problem, improve the adaptability of cable under the condition of expend with heat and contract with cold and to insulating layer 5 peel off convenience and thoroughly, this high fire-retardant flexible fireproof cable still includes: the inside of filling layer 1 is equipped with central chamber 7, and central chamber 7 is used for depositing gas temporarily, realizes carrying out the adjustment of adaptability when insulating layer 5 takes place expend with heat and contract with cold.
The both sides tip of elasticity ring canal 4 all is equipped with collar 17, the setting of collar 17 cuts apart a plurality of elasticity ring canal 4 for elasticity ring canal 4 forms a plurality of structures of concatenation each other, thereby effectual precision and the convenience when improving the cable butt joint, collar 17 has kept away from insulating layer 5 end and has seted up movable groove 23, the both sides tip of elasticity ring canal 4 all is equipped with intercommunication side opening 21, the other end of intercommunication side opening 21 passes collar 17 and is linked together with movable groove 23, the inside stable gas that is equipped with of elasticity ring canal 4, inside stable gas of elasticity ring canal 4 can be followed intercommunication side opening 21 and is got into movable groove 23 inside, and then realize the volume change of elasticity ring canal 4.
The bottom of the movable groove 23 is provided with a vertical hole 27, the inside of the movable groove 23 is connected with a sealing push plate 25 in a sliding manner, the outer wall of the sealing push plate 25 is connected with the inner wall of the movable groove 23 in a sealing sliding manner through a sealing ring, so that when stable gas in the elastic ring pipe 4 enters the movable groove 23 along the side hole 21, the air pressure in the movable groove 23 is increased and drives the sealing push plate 25 to move upwards, and the sealing ring is further arranged to improve the moving stability and sealing performance of the sealing push plate 25.
The outer wall uniform array of insulating layer 5 is equipped with multiunit heat dissipation groove 22, one side that sealing push pedal 25 is close to insulating layer 5 is equipped with insulating scraper 26, insulating scraper 26 is kept away from sealing push pedal 25's one end and passes vertical hole 27 and match with heat dissipation groove 22, consequently, when insulating scraper 26 and the mutual sealed joint in heat dissipation groove 22, insulating scraper 26 blocks up heat dissipation groove 22, and when sealing push pedal 25 upwards moves and drive insulating scraper 26 of bottom upwards remove, insulating scraper 26 breaks away from the joint with heat dissipation groove 22, the heat that cable core 6 circular telegram produced is discharged along heat dissipation groove 22, thereby effectual improvement is to the adaptability heat extraction function of cable core 6.
An exhaust side cavity 20 is formed between the inner wall of the mounting ring sleeve 17 and the outer wall of the insulating layer 5, the other end of the exhaust side cavity 20 is communicated with a heat discharging hole 16, and the heat radiating groove 22 and the exhaust side cavity 20 are mutually communicated, so that when the insulating scraper 26 is separated from the heat radiating groove 22, heat generated by energizing the cable core 6 is discharged into the exhaust side cavity 20 along the heat radiating groove 22, enters the heat discharging hole 16 along the exhaust side cavity 20 and is finally discharged to the outside.
The outer surface of the elastic ring pipe 4 is provided with a ventilation pipe 12, and the other end of the ventilation pipe 12 penetrates through the filling layer 1 and is communicated with the side wall of the central cavity 7, so that the gas in the elastic ring pipe 4 can be discharged to the inside of the central cavity 7 along the ventilation pipe 12 for temporary storage.
The side wall of the central cavity 7 is symmetrically provided with a connecting spring 8, the other side of the connecting spring 8 is provided with a sealing slide plate 9, the outer surface of the sealing slide plate 9 is in sealing sliding connection with the inner wall of the central cavity 7 through a sealing ring, when the air pressure in the central cavity 7 is increased, the sealing slide plate 9 is driven by the air pressure to extrude the connecting spring 8 and move towards the inner wall end close to the central cavity 7, a plurality of groups of pressure check valves 10 are uniformly arranged in the sealing slide plate 9, the pressure check valves 10 are provided with preset pressure values, when the air pressure in the central cavity 7 is larger than the preset pressure value set by the pressure check valves 10, the pressure check valves 10 are opened, a cooling cavity 11 is formed between the sealing slide plate 9 and the inner wall of the central cavity 7, and the cooling cavity 11 is internally provided with coolant which is mostly dry powder, and particularly, when the pressure check valves 10 are opened according to an actually used cable, the coolant in the cooling cavity 11 flows into the central cavity 7 along the pressure check valves 10 and finally reaches the inside the elastic ring pipe 4 through a ventilation pipeline 12 reversely along the central cavity 7 to realize the fire-extinguishing and flame-retarding effects on the cable core 6.
The even array in surface of filling layer 1 and protective sheath 2 is equipped with multiunit perpendicular groove 13, perpendicular inslot portion sliding connection has montant 14, the montant 14 is kept away from the one end of collar cover 17 and is equipped with presses alarm 15, press alarm 15 mostly can produce the warning device of dazzling light and emergence sound, press alarm 15 and begin work after pressing alarm 15 breaks away from perpendicular groove 13, not only can produce dazzling light but also can send the warning sound simultaneously, thereby remind surrounding personnel to avoid and put out a fire, the inner wall of perpendicular groove 13 is equipped with elastic friction ring 28, elastic friction ring 28 and the lateral wall elastic friction sliding connection of pressing alarm 15, then when pressing alarm 15 and elastic friction ring 28 extrusion contact, not only can make pressing alarm 15 stop the warning, but also can exert spacing frictional force to pressing alarm 15 simultaneously, avoid it to break away from with perpendicular groove 13 easily.
The other end of the heat discharging hole 16 far away from the exhaust side cavity 20 passes through the vertical rod 14 and the pressing alarm 15 and is communicated with the outside, so that heat generated in the heat discharging hole 16 is discharged to the outside through the vertical rod 14 and the pressing alarm 15 in a normal working state, and serious safety accidents such as fire and the like caused by low cooling efficiency in the cable are avoided.
The mounting ring sleeve 17 is far away from the one end symmetry of elasticity ring canal 4 and is equipped with draw-in groove 18 and fixture block 19 respectively, draw-in groove 18 and fixture block 19 assorted, the draw-in groove 18 of same elasticity ring canal 4 both sides is relative with the position of fixture block 19, consequently adjacent elasticity ring canal 4 carries out the card connection with the help of draw-in groove 18 and fixture block 19, and after the inside steady gas of elasticity ring canal 4 discharges, fixture block 19 moves down along with mounting ring sleeve 17 and breaks away from with draw-in groove 18 to effectual improvement is when carrying out the cable concatenation installation effectiveness, and to the peeling efficiency of the insulating layer 5 of cable core 6 surface adhesion.
The bottom of montant 14 and the sealed joint in top of collar 17, guarantee movable groove 23 to be the seal groove body with the help of montant 14, avoid its inside gaseous loss, the top of sealed push pedal 25 is equipped with reset spring 24, the other end top of reset spring 24 and the bottom fixed connection of montant 14, and the reset nature and the stability of further improvement sealed push pedal 25 removal with the help of reset spring 24.
The height value of the insulating scraper 26 is larger than the thickness value of the insulating layer 5, therefore, when the cable is spliced, the insulating scraper 26 is inserted into the insulating layer 5 along the heat dissipation groove 22, the stripping efficiency and the stripping thoroughness of the insulating layer 5 on the outer surface of the cable core 6 are realized, the distance between the communicating side holes 21 and the movable groove 23 is larger than the height value of the sealing push plate 25, therefore, when the stable gas in the elastic ring pipe 4 is discharged, the sealing push plate 25 moves downwards to the inner bottom of the movable groove 23, the communicating side holes 21 are correspondingly positioned at the top of the sealing push plate 25, the insulating scraper 26 is further convenient to strip the insulating layer 5, the volume between the sealing push plate 25 and the inner bottom of the movable groove 23 is far smaller than the inner volume of the elastic ring pipe 4, when the heated volume of the insulating layer 5 is increased, the extrusion force applied by the insulating layer 5 to the insulating scraper 26 is smaller than the extrusion force applied by the insulating layer 5 to the bottom of the sealing push plate 25, the sealing push plate 25 can drive the insulating scraper 26 at the bottom to move away from the end of the insulating layer 5, the sealing plug with the insulating scraper 26 is separated from the heat dissipation groove 22, and the heat in the insulating layer 5 can be discharged into the final side cavity 20, and discharged along the heat dissipation hole 16.
The thermal expansion coefficient of the stable gas in the elastic ring pipe 4 is smaller than that of the insulating layer 5, when the cable core 6 is electrified to generate heat, the volume expansion amount of the insulating layer 5 is larger than that of the stable gas in the elastic ring pipe 4 under the condition of being heated, when the stable gas in the elastic ring pipe 4 is extruded by the insulating layer 5, part of the stable gas is discharged to the bottom in the movable groove 23 along the communicating side hole 21 and applies thrust to the bottom of the sealing push plate 25, and the other part of the stable gas in the elastic ring pipe 4 enters the central cavity 7 along the ventilation pipeline 12 to be temporarily stored.
The inside wall top of movable groove 23 is equipped with spacing ring 29, and spacing ring 29's bottom and sealing push pedal 25's top seal phase-match, therefore when sealing push pedal 25 moved to the maximum distance to keeping away from insulating layer 5 end, sealing push pedal 25's top and spacing ring 29's bottom looks joint match, and movable groove 23 still is sealed space, and sealing push pedal 25 can't continue to move to keeping away from insulating layer 5 end.
During the use, the cable installation is accomplished according to the first embodiment, and adjust the change of insulating layer 5 volume with the help of the inside elasticity ring canal 4 of inner chamber 3, specifically, when the volume of letting in of cable core 6 internal current increases and lead to the steady rising around, this temperature can transmit to insulating layer 5 department, insulating layer 5 increases under the principle of expend with heat and contract with cold, then insulating layer 5 increases to the extrusion force of elasticity ring canal 4 inner wall, the inside part steady gas of elasticity ring canal 4 is arranged to the movable groove 23 along intercommunication side opening 21, this steady gas exerts thrust to the bottom of sealing push pedal 25 and drives sealing push pedal 25 and extrudees reset spring 24 and upwards move, sealing push pedal 25 moves the synchronous insulating scraper 26 to keeping away from insulating layer 5 end that drives when upwards, and insulating layer 5 volume's expansion height is less than insulating scraper 26 to keeping away from insulating layer 5 end removal distance, then insulating scraper 26 breaks away from the joint with heat dissipation groove 22, the heat that insulating layer 5 produced is arranged to the exhaust side chamber 20 inside at first, and along exhaust side chamber 20 gets into the inside of exhaust side chamber 16, finally, it is accurate to be arranged to the external heat dissipation efficiency of cable along the heat dissipation, realize accurate heat dissipation performance of cable is realized.
Meanwhile, after the sealing push plate 25 moves a certain distance, the thrust of the stable gas in the elastic ring pipe 4 to the bottom of the sealing push plate 25 is equal to the elastic force of the reset spring 24 to the top of the sealing push plate 25, the position of the sealing push plate 25 is not changed any more, at the moment, other part of gas in the elastic ring pipe 4 enters the central cavity 7 along the ventilation pipeline 12, the stable gas quantity in the central cavity 7 is continuously increased, acting force is applied to the sealing slide plate 9, the volume of the elastic ring pipe 4 is not changed any more when the elastic force of the connecting spring 8 is applied to the other end of the sealing slide plate 9, and therefore, when the insulating layer 5 expands in a high-temperature environment, the volume of the elastic ring pipe 4 is correspondingly reduced, the extrusion force applied to the outer surface of the insulating layer 5 by the elastic ring pipe 4 is further ensured to be reduced, the situation that the acting force is applied to the cable core 6 by the insulating layer 5 in a reverse direction is avoided, the electrifying efficiency of the cable core 6 is influenced, and the cooling efficiency and the working stability of the cable are effectively improved.
When the current of the cable core 6 is reduced, and the external temperature is reduced, the heat applied to the outside of the cable core 6 is reduced, the temperature around the insulating layer 5 is reduced, the volume of the insulating layer 5 is reduced under the principle of thermal expansion and cold contraction, the extrusion force applied to the elastic ring pipe 4 by the insulating layer 5 is reduced, then the elastic force of the return spring 24 drives the sealing push plate 25 to move towards the end close to the insulating layer 5, the sealing push plate 25 drives the insulating scraper 26 to synchronously move towards the end close to the insulating layer 5 and to be in sealing clamping connection with the heat dissipation groove 22, the heat dissipation groove 22 is blocked, further, the heat dissipation efficiency of the insulating layer 5 is effectively prevented from being too high, the protection performance of the cable core 6 is effectively reduced, and when the extrusion force applied to the insulating layer 5 by the elastic ring pipe 4 is reduced, the elastic force applied to the insulating layer 5 is driven to move away from the inner wall end of the central cavity 7 under the action of the elastic force of the connecting spring 8, the sealing slide 9 extrudes the central cavity 7 and enables internal gas to reversely flow into the elastic ring pipe 4 along the ventilation pipeline 12, the volume of the elastic ring pipe 4 is correspondingly increased, further, the extrusion force applied to the outer wall of the insulating layer 5 by the elastic ring pipe 4 is ensured, the insulating layer 6 is further, the insulating layer 6 is applied to the insulating layer 6, the heat dissipation efficiency is effectively prevented from being too high, the protection performance of the cable core 6 is prevented from being damaged under the heat insulation environment, and the cable core 6 is prevented from being damaged.
Meanwhile, when the temperature of the cable core 6 is continuously increased due to overlarge electrified current, the volume expansion amount of the insulating layer 5 is continuously increased, the acting force exerted by the insulating layer 5 on the outer wall of the elastic ring pipe 4 is continuously increased, part of stable gas in the elastic ring pipe 4 enters the movable groove 23 along the ventilation pipeline 12 when the elastic ring pipe 4 is extruded, the air pressure in the movable groove 23 is increased and drives the sealing push plate 25 to move far away from the end of the insulating layer 5, the acting force is exerted on the bottom of the vertical rod 14 through the reset spring 24 when the sealing push plate 25 moves, the acting force is exerted on the pressing alarm 15 at the top by the vertical rod 14, when the acting force is larger than the friction resistance between the pressing alarm 15 and the elastic friction ring 28, the pressing alarm 15 moves upwards and is separated from the vertical groove 13, and simultaneously, after the pressing alarm 15 is separated from the pressing state, the alarm starts to alarm, surrounding personnel are reminded of cooling the cable to extinguish the fire.
Meanwhile, when the sealing push plate 25 drives the insulating scraper 26 to move towards the end far away from the insulating layer 5, the blocking degree of the insulating scraper 26 on the heat dissipation groove 22 is gradually reduced, and heat generated by the cable core 6 is continuously discharged to the inside of the exhaust side cavity 20 along the heat dissipation groove 22 and finally is discharged along the exhaust side cavity 20 and the heat discharging hole 16, so that the heat discharging efficiency and the fixed-point cooling accuracy are effectively improved.
Meanwhile, when the sealing push plate 25 moves upwards to the maximum distance along the movable groove 23, the bottoms of the sealing push plate 25 and the limiting ring 29 are clamped and limited, the sealing push plate 25 cannot move upwards continuously, the air pressure in the movable groove 23 reaches the maximum, redundant stable air in the elastic ring pipe 4 enters the central cavity 7 along the air duct 12, the sealing slide plate 9 in the central cavity 7 continuously extrudes the connecting spring 8 to move towards the end close to the cooling cavity 11 under the action of the air pressure, the air pressure in the cooling cavity 11 is continuously increased, when the air pressure value in the cooling cavity 11 reaches a preset air pressure value, the pressure one-way valve 10 is opened, the coolant in the cooling cavity 11 reversely enters the central cavity 7 and reversely enters the elastic ring pipe 4 from the central cavity 7 along the air duct 12, the inside of the elastic ring pipe 4 continuously cools the insulating layer 5 and the cable core 6 at fixed points under the action of the coolant, and therefore the situation that the temperature of the cable core 6 is too high is avoided, and serious safety accidents and economic losses are caused.
When the cable part is worn and broken and needs to be spliced for a long time, an operator firstly strips the protective sleeve 2 and the filling layer 1 of the cable and respectively processes a plurality of inner cable cores 6, particularly, when the cable is actually installed, as a plurality of groups of elastic annular pipes 4 are uniformly spliced on the outer surface of the same cable core 6, and the plurality of groups of elastic annular pipes 4 are spliced by means of clamping grooves 18 and clamping blocks 19, the distance of one section of elastic annular pipe 4 is the splicing length, the operator firstly presses the mounting ring sleeve 17 at the end part, the mounting ring sleeve 17 synchronously limits the sealing push plate 25 by virtue of the limiting rings 29 when moving downwards, the sealing push plate 25 drives the insulating scraper 26 at the bottom to move towards the end part close to the insulating layer 5 and cut off the insulating layer 5 and the cable core 6, in order to improve the cutting depth of the insulating scraper 26 in the cutting process, the sealing push plate 25 is downwards pressed in the movable groove 23, the insulating scraper 26 at the bottom is driven to move downwards and improve the depth of the insulating layer 5 and the cable core 6, when the insulating scraper 26 reaches the bottom in the movable groove 23, the insulating scraper 26 is used for accurately adjusting the splicing length of the end part of the cable to be spliced, and the cable is further accurate, and the splicing length of the cable is ensured.
And after the sealing push plate 25 reaches the inner bottom of the movable groove 23, the sealing push plate 25 is misplaced with the communicating side hole 21, the communicating side hole 21 is opposite to the top of the sealing push plate 25, the stable gas in the elastic ring pipe 4 is continuously discharged into the movable groove 23 along the communicating side hole 21 and finally discharged along the top of the movable groove 23, the stable gas in the elastic ring pipe 4 is continuously reduced and the volume is continuously reduced, the stable gas in the mounting ring sleeve 17 at the other end is correspondingly reduced, and the sealing push plate 25 drives the insulating scraper 26 to extend into the heat dissipation groove 22 and be mutually clamped and matched.
And need when needs splice cable core 6 with the insulating layer 5 of cable core 6 surface even thorough clean to avoid insulating layer 5 to cause the influence to follow-up concatenation, then because the inside steady gaseous exhaust volume of elasticity ring canal 4 reduces this moment, then the collar 17 of the other end is to being close to insulating layer 5 end and remove, adjacent draw-in groove 18 and fixture block 19 break away from the joint each other, and insulating scraper 26 and the mutual joint of heat dissipation groove 22 match, the top of sealing push pedal 25 and the bottom of spacing ring 29 are fixed each other, only need rotate insulating scraper 26 this moment, make insulating scraper 26 and insulating layer 5 rotate and strike off, simultaneously insulating scraper 26's lateral shifting realizes striking off cable core 6 surface insulating layer 5, at this in-process insulating scraper 26 and insulating layer 5 spiral match strike off, and insulating scraper 26's strike off distance is the distance of elasticity ring canal 4, then the concatenation length of cable core 6 corresponds to be the distance of an elasticity ring canal 4, strike off to insulating layer 5 more thoroughly, the cable core 6 surface is cleaner, the concatenation efficiency is higher, the effect is better.
After the stripping of the insulating layer 5 on the outer surface of the cable core 6 is finished, the adjacent cable cores 6 are spliced by the prior art, the insulating tape is used for winding after the splicing is finished, the elastic ring pipe 4 can be installed on the outer surface of the cable core after the winding is finished, the adjacent direct installation is realized by means of mutual clamping of clamping grooves 18 and clamping blocks 19 at the two ends of the elastic ring pipe 4, the splicing efficiency is high, and finally the filling layer 1 and the protective sleeve 2 are repeatedly installed on the plurality of groups of the elastic ring pipes 4, and the splicing of the cable is finished.
In particular, the device correspondingly adjusts the heat dissipation efficiency of the insulating layer 5 by means of the extrusion degree of the insulating layer 5 on the elastic ring pipe 4, has stronger adaptability and higher stability, and simultaneously ensures the extrusion force applied to the cable core 6 by the insulating layer 5 by means of temporary storage of stable gas in the elastic ring pipe 4, thereby effectively ensuring the power-on efficiency and power-on stability of the cable core 6; when the temperature generated by the cable core 6 reaches a certain value, the temperature can be given out to give an alarm at fixed points, so that the flame retardant efficiency and the flame retardant accuracy are improved; can also inject the concatenation length of cable when needs splice the cable, the precision is higher, and the operation is faster, can also thoroughly effectually strike off insulating layer 5 of cable core 6 surface simultaneously, avoids insulating layer 5 to cause the influence to the concatenation stability of follow-up cable and the circular telegram efficiency of cable core 6, improves concatenation accuracy and concatenation stability.
The device has stronger self-adaptive adjustment capability, effectively ensures the extrusion force applied by the insulating layer 5 to the cable core 6, and thereby improves the power-on efficiency and power-on stability of the cable core 6; meanwhile, the fixed-point cooling flame-retardant efficiency is better, the accuracy is better, and the serious economic and safety loss is effectively avoided; the splicing length can be effectively guaranteed when the cables are spliced, the splicing efficiency is enhanced, the insulating layer 5 on the outer surface of the cable core 6 to be spliced can be thoroughly and effectively scraped, the operation is simple, and the precision is higher.
Third embodiment
The cooling flame-retardant method for the high-flame-retardant flexible fireproof cable utilizes the high-flame-retardant flexible fireproof cable to cool and flame the high-flame-retardant flexible fireproof cable, and comprises the following steps of:
s1, when the heat generated by the cable core 6 is increased, the volume of the insulating layer 5 is increased, the elastic annular pipe 4 is extruded, part of stable gas in the elastic annular pipe 4 enters the movable groove 23 along the communicating side hole 21, the sealing push plate 25 drives the insulating scraper 26 to move towards the end far away from the insulating layer 5, and the insulating scraper 26 is separated from the heat dissipation groove 22.
S2, when the heat generated by the cable core 6 is further increased, part of stable gas in the elastic ring pipe 4 enters the central cavity 7 along the ventilation pipeline 12, the pressure value at the end of the pressure one-way valve 10 is continuously increased and opened, and the coolant in the cooling cavity 11 reversely enters the elastic ring pipe 4 to cool and retard flame.
And S3, when the cable cores 6 are spliced, air in the elastic ring pipe 4 is discharged, the insulating scraper 26 is clamped with the heat dissipation groove 22, and the mounting ring 17 is rotated to drive the insulating scraper 26 to spirally scrape the insulating layer 5.
The application limits the cooling flame-retardant method of the cable, effectively improves the adaptability and stability of the cable, and ensures the cooling flame-retardant performance of the cable in the actual use process.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The high-flame-retardance flexible fireproof cable comprises a filling layer, wherein a protective sleeve is arranged on the outer surface of the filling layer, and the high-flame-retardance flexible fireproof cable is characterized in that a plurality of groups of inner cavities are uniformly arranged in the filling layer in an array mode, elastic annular pipes are arranged in the inner cavities, an insulating layer is arranged in the elastic annular pipes, and cable cores are arranged in the insulating layer;
the inside of the filling layer is provided with a central cavity, the end parts of the two sides of the elastic ring pipe are respectively provided with a mounting ring sleeve, the ends of the mounting ring sleeves, which are far away from the insulating layer, are provided with movable grooves, the inside of each movable groove is connected with a sealing push plate in a sliding manner, and one side of each sealing push plate, which is close to the insulating layer, is provided with an insulating scraper;
a plurality of groups of heat dissipation grooves are uniformly arranged on the outer wall of the insulating layer in an array manner, an exhaust side cavity is formed between the inner wall of the mounting ring sleeve and the outer wall of the insulating layer, and the other end of the exhaust side cavity is communicated with a heat dissipation hole;
the two side ends of the elastic ring pipe are respectively provided with a communicating side hole, the other ends of the communicating side holes penetrate through the mounting ring sleeve and are communicated with the movable groove, the outer surface of the elastic ring pipe is provided with a ventilation pipeline, and the other ends of the ventilation pipelines penetrate through the filling layer and are communicated with the central cavity;
the side wall of center chamber all symmetry is equipped with connecting spring, connecting spring's opposite side is equipped with sealed slide, the inside uniform array of sealed slide is equipped with multiunit pressure check valve, pressure check valve is equipped with the pressure default, sealed slide the surface pass through the sealing ring with the inner wall sealing sliding connection of center chamber, sealed slide with form the cooling chamber between the inner wall of center chamber, the cooling intracavity portion is equipped with the coolant.
2. The high-flame-retardant flexible fireproof cable according to claim 1, wherein the material of the filling layer is glass fiber inorganic matter, the inside of the elastic ring pipe is provided with stable gas, the material of the insulating layer is high-silica glass fiber, the thermal expansion coefficient of the stable gas inside the elastic ring pipe is smaller than that of the insulating layer, the material of the cable core is a plurality of copper wires, and the material of the protective sleeve is low-smoke halogen-free polyolefin.
3. The high-flame-retardant flexible fireproof cable according to claim 1, wherein a plurality of groups of vertical grooves are uniformly arranged on the outer surfaces of the filling layer and the protective sleeve in an array manner, vertical rods are connected inside the vertical grooves in a sliding manner, a pressing alarm is arranged at one end, away from the mounting ring sleeve, of each vertical rod, an elastic friction ring is arranged on the inner wall of each vertical groove, and the elastic friction ring is in elastic friction sliding connection with the side wall of the pressing alarm.
4. A high flame retardant flexible fireproof cable according to claim 3, wherein a vertical hole is cut at the bottom of the movable groove, the heat dissipation groove is communicated with the exhaust side cavity, one end of the insulating scraper, which is far away from the sealing push plate, passes through the vertical hole and is matched with the heat dissipation groove, and one end of the heat dissipation hole, which is far away from the exhaust side cavity, passes through the vertical rod and the pressing alarm and is communicated with the outside.
5. The high-flame-retardant flexible fireproof cable according to claim 1, wherein the mounting ring sleeve is symmetrically provided with clamping grooves and clamping blocks at one end far away from the elastic ring sleeve, the clamping grooves are matched with the clamping blocks, and the clamping grooves at two sides of the same elastic ring sleeve are opposite to the clamping blocks.
6. The high-flame-retardant flexible fireproof cable according to claim 3, wherein a limiting ring is arranged at the top of the inner side wall of the movable groove, the bottom of the limiting ring is matched with the top seal of the sealing push plate, and the outer wall of the sealing push plate is in sealing sliding connection with the inner wall of the movable groove through a sealing ring.
7. The high-flame-retardant flexible fireproof cable according to claim 6, wherein the bottom of the vertical rod is clamped with the top of the mounting ring sleeve in a sealing manner, a reset spring is arranged at the top of the sealing push plate, and the top of the other end of the reset spring is fixedly connected with the bottom of the vertical rod.
8. The high-flame-retardant flexible fireproof cable according to claim 1, wherein the height value of the insulating scraper is larger than the thickness value of the insulating layer, the distance between the communicating side hole and the bottom in the movable groove is larger than the height value of the sealing push plate, and the volume between the sealing push plate and the bottom in the movable groove is smaller than the internal volume of the elastic ring pipe.
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| CN214505085U (en) * | 2021-04-14 | 2021-10-26 | 青岛海裕隆电子股份有限公司 | Compound stranded fire prevention type cable |
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| IT1043874B (en) * | 1974-02-01 | 1980-02-29 | Felten & Guilleaume Kabelwerk | WATER COOLED CABLE FOR THE TRANSMISSION OF HIGH VOLTAGE ENERGY WITH A CENTRAL CORROSION RESISTANT COOLING TUBE |
| CN202134252U (en) * | 2011-08-08 | 2012-02-01 | 蒋菊生 | Parallel cable |
| CN110246615B (en) * | 2019-06-21 | 2020-08-11 | 宁波卡倍亿新材料科技有限公司 | High-strength impact-resistant flame-retardant insulated cable |
| CN211628753U (en) * | 2019-12-03 | 2020-10-02 | 福建通宇电缆有限公司 | High temperature resistant ageing resistance copper wire |
| CN111210939B (en) * | 2020-02-12 | 2020-11-03 | 重庆西野电线电缆科技有限公司 | Polyvinyl chloride insulation fire-resistant power cable |
| CN212303182U (en) * | 2020-06-10 | 2021-01-05 | 江苏华远电缆有限公司 | Cross-linked polyethylene insulated fire-resistant power cable |
| CN212136027U (en) * | 2020-06-12 | 2020-12-11 | 广州市广惠通线缆有限公司 | Fireproof cable with continuous flexible sheath |
| CN213339734U (en) * | 2020-09-14 | 2021-06-01 | 无锡市登峰电缆有限公司 | Insulating fire prevention fire-retardant power cable |
| CN213183708U (en) * | 2020-11-20 | 2021-05-11 | 河南省建云线缆有限公司 | High-reliability heat-resistant cable |
| CN112927850B (en) * | 2021-02-01 | 2022-07-26 | 浙江正泰电缆有限公司 | Fireproof flame-retardant cable and preparation method thereof |
| CN116612928A (en) * | 2021-09-18 | 2023-08-18 | 丁明亮 | Flame-retardant power cable |
| CN215933223U (en) * | 2021-10-29 | 2022-03-01 | 盐城永丹电器有限公司 | Insulated cable with elastic extension function |
| CN114864170B (en) * | 2022-05-07 | 2023-08-22 | 济南圣通电力线缆有限公司 | Explosion-proof cable for power engineering |
| CN115036073B (en) * | 2022-06-01 | 2023-07-04 | 虹峰电缆股份有限公司 | Flame-retardant fire-resistant power cable |
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| CN214505085U (en) * | 2021-04-14 | 2021-10-26 | 青岛海裕隆电子股份有限公司 | Compound stranded fire prevention type cable |
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