Fireproof power cable used in high-temperature environment

Abstract

The utility model relates to the technical field of fire-resistant cables, and discloses a fire-resistant power cable used in a high-temperature environment, which comprises a low-smoke halogen-free flame-retardant outer sheath, a glass fiber flame-retardant belt is arranged in a cavity of the low-smoke halogen-free flame-retardant outer sheath, a steel belt armoring protective layer is arranged in a cavity of the glass fiber flame-retardant belt, and the steel belt armoring protective layer is arranged in a cavity of the glass fiber flame-retardant belt. A cavity of the steel tape armoring protection layer is internally provided with an inner sheath, a cavity of the inner sheath is internally provided with a mineral substance fireproof heat insulation layer, a cavity of the mineral substance fireproof heat insulation layer is internally provided with a mica flame-retardant layer, and a cavity of the mica flame-retardant layer is internally provided with a heat dissipation support which comprises a sealing device. The second polysiloxane sealant and the first polysiloxane sealant are respectively and fixedly arranged at the head and the tail of the low-smoke halogen-free flame-retardant outer sheath; comprising a pressing device. The sealing device can play a sealing role at the joint of the two low-smoke halogen-free flame-retardant outer sheaths, the power cable can be effectively prevented from being heated, and the pressing device can improve the sealing performance of the sealing device.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire-resistant cables, and specifically relates to a fire-resistant power cable used in a high-temperature environment. Background Art

[0002] Electric wires and cables are wire products used to transmit electrical (magnetic) energy, information, and realize the conversion of electrical and magnetic energy. In a broad sense, electric wires and cables are also simply called cables. In a narrow sense, a cable refers to an insulated cable, which can be defined as a collective body composed of the following parts: one or more insulated wire cores, and their respective possible coating layers, total protective layer, and outer protective layer. A cable can also have additional uninsulated conductors. However, in the prior art, the inventor has found the following problems in use:

[0003] The prior art discloses a fire-resistant and high-temperature-resistant copper core armored power cable (201810826258.5), which includes a conductor and a heat dissipation device. Three conductors are stranded by a number of copper wires, and the three conductors are arranged in a triangular shape. The conductor is extruded with a mineral insulation layer, and the mineral insulation layer is extruded with a color separation layer. The outside of the color separation layer is connected to the heat dissipation device. Flame retardant filling is filled between the three color separation layers. A mica flame retardant layer is extruded on the shielding layer to increase the contact area between the surface of the low-smoke and halogen-free flame retardant outer sheath and the outside world. By providing a glass fiber flame retardant belt, a mineral fireproof and heat insulation layer, and a mica flame retardant layer, the cable has excellent fire-resistant and high-temperature-resistant performance, reduces the influence of temperature on the performance of the power cable, and ensures its normal use; a heat dissipation bracket is arranged inside the traditional cable.

[0004] The prior art makes the cable have excellent fire-resistant and high-temperature-resistant performance, and reduces the influence of temperature on the performance of the power cable by setting a low-smoke and halogen-free flame retardant outer sheath, a glass fiber flame retardant belt, a steel strip armored protective layer, an inner sheath, a mineral fireproof and heat insulation layer, a mica flame retardant layer, and a heat dissipation bracket. However, during the working process of the prior art, when two electric wires and cables need to be connected, they are usually connected by means of clamps and other objects. However, clamps and other objects cannot play a sealing role. After connection, heat may enter the connection part of the two power cables through the clamp, which has an impact on the power cable and has certain disadvantages in use.

[0005] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present utility model is:

[0007] A fire-resistant power cable used in a high-temperature environment, the cable:

[0008] It includes a low-smoke and halogen-free flame-retardant outer sheath. Inside the cavity of the low-smoke and halogen-free flame-retardant outer sheath, a fiberglass flame-retardant tape is installed. Inside the cavity of the fiberglass flame-retardant tape, a steel tape armor protection layer is installed. Inside the cavity of the steel tape armor protection layer, an inner sheath is installed. Inside the cavity of the inner sheath, a mineral fireproof and heat-insulating layer is installed. Inside the cavity of the mineral fireproof and heat-insulating layer, a mica flame-retardant layer is installed. Inside the cavity of the mica flame-retardant layer, a heat dissipation bracket is arranged.

[0009] It includes a sealing device, and the sealing device includes a second polysiloxane sealant and a first polysiloxane sealant. The second polysiloxane sealant and the first polysiloxane sealant are respectively fixedly installed at the head and tail of the low-smoke and halogen-free flame-retardant outer sheath.

[0010] It includes a pressing device, and the pressing device includes a plurality of pressing plates. The plurality of pressing plates are all arranged in an arc array on the side wall of the low-smoke and halogen-free flame-retardant outer sheath.

[0011] As a preferred embodiment of the present utility model, a sealing groove is formed on the front side wall of the second polysiloxane sealant. A sealing ring is fixedly installed on the rear side wall surface of the first polysiloxane sealant. The sealing ring is movably connected to the sealing groove. Three limiting grooves are formed in an annular array on the front side wall surface of the heat dissipation bracket. Three limiting rods are fixedly installed in an annular array on the rear side wall surface of the heat dissipation bracket. The corresponding limiting rods are inserted into the cavities of the corresponding limiting grooves.

[0012] As a preferred embodiment of the present utility model, four side plates are fixedly installed in an annular array on the front end side wall of the low-smoke and halogen-free flame-retardant outer sheath. The front and rear side wall surfaces of the plurality of side plates are all in a hollow state. A first translation rod is arranged on the front side wall of the upper and lower two side plates. A T-shaped block is fixedly installed on the rear side wall surface of the first translation rod. The T-shaped block is movably connected to the corresponding side plate through the first translation rod. A resisting rod is fixedly installed at the left and right ends of the side wall surface of the two first translation rods close to each other.

[0013] As a preferred embodiment of the present utility model, a second translation rod is arranged on the front side wall surfaces of the left and right side plates. A T-shaped block is also fixedly installed on the rear side wall surface of the second translation rod. The T-shaped blocks on the left and right sides are respectively movably connected to the corresponding side plates through the second translation rods. A resisting block is fixedly installed on the side wall surface of the two second translation rods away from each other. The side wall surfaces of the two upper and lower corresponding resisting blocks away from each other are both in an inclined state from far to near from the side close to the second translation rod to the side away from the second translation rod. The resisting rod abuts against the second translation rod.

[0014] As a preferred embodiment of the present utility model, two connecting rods are fixedly installed on the front side wall surfaces of the two second translation rods and the two first translation rods, and a plurality of pressing plates are respectively fixedly installed on the side wall surfaces of the two corresponding connecting rods close to the low-smoke halogen-free flame-retardant outer sheath.

[0015] As a preferred embodiment of the present utility model, a threaded hole is formed on the side wall surface of each of the two first translation rods away from each other, and a bolt is commonly threadedly connected between the two corresponding upper and lower threaded holes, and the threads at the upper and lower ends of the bolt are in opposite states.

[0016] As a preferred embodiment of the present utility model, a fixing plate is fixedly installed at each end of the rear side wall surfaces of the two side plates on the left and right sides away from each other, a spring is fixedly installed on the side wall surface of each of the two fixing plates close to each other, and the other ends of the two springs are fixedly connected to the corresponding T-shaped blocks.

[0017] The present utility model has the following beneficial effects compared with the prior art:

[0018] 1. In summary, by providing a sealing device and a pressing device, the sealing device can seal the connection between the two low-smoke halogen-free flame-retardant outer sheaths, effectively preventing the power cable from being heated, and the pressing device can improve the sealing performance of the sealing device. Compared with the prior art, it has the characteristics of convenient use and simple structure.

[0019] 2. In summary, by providing a first polydimethylsiloxane sealant, a second polydimethylsiloxane sealant, a sealing groove, a limiting groove, a sealing ring and a limiting rod, the first polydimethylsiloxane sealant and the second polydimethylsiloxane sealant can be closely attached through the connection of the sealing groove and the sealing ring to achieve a sealing effect. By inserting the limiting rod into the cavity of the limiting groove, the movement of the two low-smoke halogen-free flame-retardant outer sheaths can be prevented, which affects the heat insulation effect. It is convenient to use and has a simple structure.

[0020] 3. In summary, by providing a spring, a fixing plate, a side plate, a T-shaped block, a pressing block, a second translation rod, a pressing plate, a connecting rod, a pressing rod, a threaded hole, a first translation rod and a bolt, the rotation of the two bolts can drive a plurality of pressing plates to fit and squeeze against the second polydimethylsiloxane sealant. By squeezing the second polydimethylsiloxane sealant, the second polydimethylsiloxane sealant and the first polydimethylsiloxane sealant can be more closely attached, thereby improving the sealing effect and effectively controlling the influence of heat on the power cable. It is convenient to use and has a simple structure.

[0021] The following further describes in detail the specific implementation manners of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the drawings:

[0023] Figure 1 This is a three-dimensional view of the head and tail of the low-smoke, halogen-free, flame-retardant outer sheath 10 of the present utility model;

[0024] Figure 2 This is a three-dimensional view of one side of the low-smoke, halogen-free, flame-retardant outer sheath 10 of the present utility model;

[0025] Figure 3 This is a three-dimensional view of one side of the pressing device of the present utility model;

[0026] Figure 4 This is a three-dimensional view of one side of the sealing device of the present utility model;

[0027] Figure 5 This is a three-dimensional view of the sealing device and the pressing device of the present utility model;

[0028] Figure 6 This is a three-dimensional view of one side of a partial pressing plate 31 of the present utility model;

[0029] Figure 7 This is a three-dimensional view of the other side of a partial pressing plate 31 of the present utility model;

[0030] Figure 8 This is a three-dimensional view of the spring 37 of the present utility model.

[0031] In the figure: 10, low-smoke, halogen-free, flame-retardant outer sheath; 12, fiberglass flame-retardant tape; 13, steel tape armor protection layer; 14, inner sheath; 15, mineral fireproof and heat-insulating layer; 16, mica flame-retardant layer; 17, heat dissipation bracket; 18, first polydimethylsiloxane sealant; 19, second polydimethylsiloxane sealant; 20, side plate; 21, first translation rod; 22, bolt; 23, limit groove; 25, sealing ring; 26, limit rod; 27, sealing groove; 29, T-shaped block; 30, connecting rod; 31, pressing plate; 32, threaded hole; 33, abutting rod; 34, second translation rod; 35, abutting block; 36, fixing plate; 37, spring. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model.

[0033] As Figure 1 and Figure 2 shown, a fire-resistant power cable used in a high-temperature environment, wherein:

[0034] It includes a low-smoke and halogen-free flame-retardant outer sheath 10. Inside the cavity of the low-smoke and halogen-free flame-retardant outer sheath 10, a fiberglass flame-retardant tape 12 is installed. Inside the cavity of the fiberglass flame-retardant tape 12, a steel tape armor protection layer 13 is installed. Inside the cavity of the steel tape armor protection layer 13, an inner sheath 14 is installed. Inside the cavity of the inner sheath 14, a mineral fireproof and heat-insulating layer 15 is installed. Inside the cavity of the mineral fireproof and heat-insulating layer 15, a mica flame-retardant layer 16 is installed. Inside the cavity of the mica flame-retardant layer 16, a heat dissipation bracket 17 is arranged;

[0035] It includes a sealing device. The sealing device includes a second polysiloxane sealant 19 and a first polysiloxane sealant 18. The second polysiloxane sealant 19 and the first polysiloxane sealant 18 are respectively fixedly installed at the head and tail of the low-smoke and halogen-free flame-retardant outer sheath 10;

[0036] It includes a pressing device. The pressing device includes a plurality of pressing plates 31. The plurality of pressing plates 31 are all arranged in an arc array on the side wall of the low-smoke and halogen-free flame-retardant outer sheath 10.

[0037] It should be noted that: the low-smoke and halogen-free flame-retardant outer sheath 10, the fiberglass flame-retardant tape 12, the steel tape armor protection layer 13, the inner sheath 14, the mineral fireproof and heat-insulating layer 15, the mica flame-retardant layer 16 and the heat dissipation bracket 17 have all been disclosed in a fire-resistant and high-temperature-resistant copper core armored power cable (201810826258.5), and will not be elaborated here.

[0038] During specific use, the sealing device can play a sealing role in the connection of two low-smoke and halogen-free flame-retardant outer sheaths 10, preventing heat sources from entering the connection of the two low-smoke and halogen-free flame-retardant outer sheaths 10 and causing high-temperature damage to the power cable. The pressing device can improve the sealing effect of the sealing device.

[0039] In summary, by setting the sealing device and the pressing device, the sealing device can play a sealing role at the connection of the two low-smoke and halogen-free flame-retardant outer sheaths 10, effectively preventing the power cable from being heated. The pressing device can improve the sealing performance of the sealing device. Compared with the prior art, it has the characteristics of convenient use and simple structure.

[0040] As Figure 1 、 Figure 3 and Figure 4 shown, a sealing groove 27 is opened on the front side wall of the second polysiloxane sealant 19. A sealing ring 25 is fixedly installed on the rear side wall surface of the first polysiloxane sealant 18. The sealing ring 25 is movably connected with the sealing groove 27. Three limiting grooves 23 are opened in an annular array on the front side wall surface of the heat dissipation bracket 17. Three limiting rods 26 are fixedly installed in an annular array on the rear side wall surface of the heat dissipation bracket 17. The corresponding limiting rods 26 are inserted into the cavities of the corresponding limiting grooves 23.

[0041] During specific use, when the sealing ring 25 is inserted into the cavity of the sealing groove 27, the first polysiloxane sealant 18 and the second polysiloxane sealant 19 can play a sealing role, and the front ends or rear ends of the two low-smoke halogen-free flame-retardant outer sheaths 10 are fitted. By inserting the limiting rod 26 into the cavity of the limiting groove 23, the two low-smoke halogen-free flame-retardant outer sheaths 10 are limited to prevent the two low-smoke halogen-free flame-retardant outer sheaths 10 from rotating and affecting the heat insulation effect.

[0042] In summary, by setting the first polysiloxane sealant 18, the second polysiloxane sealant 19, the sealing groove 27, the limiting groove 23, the sealing ring 25 and the limiting rod 26, the first polysiloxane sealant 18 and the second polysiloxane sealant 19 can be closely fitted through the connection of the sealing groove 27 and the sealing ring 25 to play a sealing role. By inserting the limiting rod 26 into the cavity of the limiting groove 23, the two low-smoke halogen-free flame-retardant outer sheaths 10 are prevented from moving and affecting the heat insulation effect. It is convenient to use and has a simple structure.

[0043] As Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown, four side plates 20 are fixedly installed on the front side wall of the low-smoke halogen-free flame-retardant outer sheath 10 in an annular array. The front and rear side wall surfaces of the plurality of side plates 20 are in a hollow state. A first translation rod 21 is provided on the front side wall of each of the upper and lower two side plates 20. A T-shaped block 29 is fixedly installed on the rear side wall surface of the first translation rod 21. The T-shaped block 29 is movably connected to the corresponding side plate 20 through the first translation rod 21. A pressing rod 33 is fixedly installed at both the left and right ends of the side wall surface of the two first translation rods 21 close to each other.

[0044] A second translation rod 34 is provided on the front side wall surface of the left and right two side plates 20. A T-shaped block 29 is also fixedly installed on the rear side wall surface of the second translation rod 34. The left and right two T-shaped blocks 29 are respectively movably connected to the corresponding side plates 20 through the second translation rods 34. A pressing block 35 is fixedly installed on the side wall surface of the two second translation rods 34 away from each other. The side wall surfaces of the two upper and lower corresponding pressing blocks 35 away from each other are in an inclined state from far to near from the side close to the second translation rod 34 to the side away from the second translation rod 34. The pressing rod 33 abuts against the second translation rod 34.

[0045] Two connecting rods 30 are fixedly installed on the front side wall surfaces of the two second translation rods 34 and the two first translation rods 21. A plurality of pressing plates 31 are respectively fixedly installed on the side wall surface of the two corresponding connecting rods 30 close to the low-smoke halogen-free flame-retardant outer sheath 10.

[0046] On the side walls of the two first translation rods 21 facing away from each other, a threaded hole 32 is provided. A bolt 22 is commonly threadedly connected between the upper and lower corresponding threaded holes 32, and the threads at the upper and lower ends of the bolt 22 are in opposite states.

[0047] At the ends of the rear side walls of the two side plates 20 on the left and right sides facing away from each other, a fixing plate 36 is fixedly installed. On the side walls of the two fixing plates 36 facing each other, a spring 37 is fixedly installed. The other ends of the two springs 37 are fixedly connected to the corresponding T-shaped blocks 29.

[0048] During specific use, when the staff rotates the two bolts 22, the two first translation rods 21 can be driven to move away from or close to each other through the threaded holes 32 due to the opposite threads at the upper and lower ends of the two bolts 22. When the two first translation rods 21 move towards each other, the upper and lower two groups of connecting rods 30 can be driven to move towards each other. The movement of the upper and lower two groups of connecting rods 30 can drive the upper and lower two pressing plates 31 to move, so that the upper and lower two pressing plates 31 are attached to and press against the wall surface of the second polydimethylsiloxane sealant 19. When the two first translation rods 21 move towards each other, the upper and lower two groups of abutting rods 33 can also be driven to move up and down. The movement of the upper and lower two groups of abutting rods 33 can move the two second translation rods 34 towards each other through the inclined surfaces of the two multiple abutting blocks 35, so as to drive the pressing plates 31 on the left and right sides to move towards each other through the two second translation rods 34, so as to squeeze the left and right sides of the second polydimethylsiloxane sealant 19 through the pressing plates 31 on the left and right sides, making the bonding between the second polydimethylsiloxane sealant 19 and the first polydimethylsiloxane sealant 18 closer, and effectively improving the sealing effect. The connection of the multiple T-shaped blocks 29 to the corresponding side plates 20 can limit the two second translation rods 34 and the two first translation rods 21. When the rotation of the two bolts 22 drives the two first translation rods 21 to move away from each other, the acting force of the two sealing grooves 27 can pull the two corresponding T-shaped blocks 29 towards the position of the fixing plate 36, and the fixing plate 36 can limit the spring 37.

[0049] In summary, by providing the spring 37, the fixing plate 36, the side plate 20, the T-shaped block 29, the abutting block 35, the second translation rod 34, the pressing plate 31, the connecting rod 30, the abutting rod 33, the threaded hole 32, the first translation rod 21 and the bolt 22, the rotation of the two bolts 22 can drive a plurality of pressing plates 31 to be attached to and extrude the second polydimethylsiloxane sealant 19. By extruding the second polydimethylsiloxane sealant 19, the second polydimethylsiloxane sealant 19 and the first polydimethylsiloxane sealant 18 can be more closely attached, thereby improving the sealing effect, effectively controlling the influence of heat on the power cable, being convenient to use, and having a simple structure.

[0050] It can be understood that the present utility model is described by way of some embodiments. Those skilled in the art will know that, without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A refractory power cable used in a high-temperature environment, characterized in that, It is described that: It includes a low-smoke and halogen-free flame-retardant outer sheath (10). Inside the cavity of the low-smoke and halogen-free flame-retardant outer sheath (10), a fiberglass flame-retardant tape (12) is installed. Inside the cavity of the fiberglass flame-retardant tape (12), a steel tape armored protective layer (13) is installed. Inside the cavity of the steel tape armored protective layer (13), an inner sheath (14) is installed. Inside the cavity of the inner sheath (14), a mineral fireproof and heat-insulating layer (15) is installed. Inside the cavity of the mineral fireproof and heat-insulating layer (15), a mica flame-retardant layer (16) is installed. Inside the cavity of the mica flame-retardant layer (16), a heat dissipation bracket (17) is arranged. It includes a sealing device. The sealing device includes a second polysiloxane sealant (19) and a first polysiloxane sealant (18). Both the second polysiloxane sealant (19) and the first polysiloxane sealant (18) are respectively fixedly installed at the head and tail of the low-smoke and halogen-free flame-retardant outer sheath (10). It includes a pressing device. The pressing device includes a plurality of pressing plates (31). The plurality of pressing plates (31) are all arranged in an arc-shaped array on the side wall of the low-smoke and halogen-free flame-retardant outer sheath (10).

2. The fire-resistant power cable used in a high-temperature environment according to claim 1, wherein A sealing groove (27) is formed on the front side wall of the second polysiloxane sealant (19). A sealing ring (25) is fixedly installed on the rear side wall surface of the first polysiloxane sealant (18). The sealing ring (25) is movably connected to the sealing groove (27). Three limiting grooves (23) are formed in an annular array on the front side wall surface of the heat dissipation bracket (17). Three limiting rods (26) are fixedly installed in an annular array on the rear side wall surface of the heat dissipation bracket (17). The corresponding limiting rods (26) are inserted into the cavities of the corresponding limiting grooves (23).

3. The fire-resistant power cable used in a high-temperature environment according to claim 2, wherein Four side plates (20) are fixedly installed in an annular array on the front end side wall of the low-smoke and halogen-free flame-retardant outer sheath (10). The front and rear side wall surfaces of the plurality of side plates (20) are all in a hollow state. A first translation rod (21) is arranged on the front side wall of the upper and lower two side plates (20). A T-shaped block (29) is fixedly installed on the rear side wall surface of the first translation rod (21). The T-shaped block (29) is movably connected to the corresponding side plate (20) through the first translation rod (21). A pressing rod (33) is fixedly installed at both the left and right ends of the side wall surface of the two first translation rods (21) close to each other.

4. The fire-resistant power cable used in a high-temperature environment according to claim 3, wherein A second translation rod (34) is arranged on the front side wall surface of the left and right side plates (20). A T-shaped block (29) is also fixedly installed on the rear side wall surface of the second translation rod (34). The left and right T-shaped blocks (29) are respectively movably connected to the corresponding side plates (20) through the second translation rod (34). A pressing block (35) is fixedly installed on the side wall surface of the two second translation rods (34) away from each other. The side wall surfaces of the two upper and lower corresponding pressing blocks (35) away from each other are both in an inclined state from far to near from the side close to the second translation rod (34) to the side away from the second translation rod (34). The pressing rod (33) abuts against the second translation rod (34).

5. The fire-resistant power cable used in a high-temperature environment according to claim 4, wherein Two connecting rods (30) are fixedly installed on the front side wall surfaces of the two second translation rods (34) and the two first translation rods (21), and a plurality of pressing plates (31) are respectively fixedly installed on the side wall surfaces of the two corresponding connecting rods (30) close to the low-smoke and halogen-free flame-retardant outer sheath (10).

6. The fire-resistant power cable used in a high-temperature environment according to claim 5, characterized in that, A threaded hole (32) is formed in each of the mutually remote side wall surfaces of the two first translation rods (21), and a bolt (22) is commonly threadedly connected between the upper and lower corresponding threaded holes (32), and the threads at the upper and lower ends of the bolt (22) are in opposite states.

7. The fire-resistant power cable used in a high-temperature environment according to claim 6, wherein, A fixing plate (36) is fixedly installed at each of the mutually remote ends of the rear side wall surfaces of the two side plates (20) on the left and right sides, a spring (37) is fixedly installed on each of the side wall surfaces of the two fixing plates (36) close to each other, and the other ends of the two springs (37) are fixedly connected to the corresponding T-shaped blocks (29).

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