High-temperature-resistant and aging-resistant crosslinked polyethylene cable

Abstract

The invention relates to the technical field of power cables, and provides a high-temperature-resistant and aging-resistant crosslinked polyethylene cable which comprises a butt joint section, locking lantern rings and a heat insulation wrapping mechanism, the two ends of the heat insulation wrapping mechanism are detachably connected with the two locking lantern rings respectively, and the heat insulation wrapping mechanism comprises a protective layer, a plurality of heat exchange section assemblies and a plurality of expansion section assemblies. The multiple heat exchange section assemblies and the multiple expansion section assemblies are arranged on the protection layer in a staggered mode, the heat insulation wrapping mechanism is used for conducting heat insulation on the cable, meanwhile, when the length of the cable changes due to temperature changes, protection on the cable is kept, and the heat exchange section assemblies can diffuse heat of the cable to the outside. The expansion section assembly can expand or contract when the length of the cable changes, and then changes along with the length of the cable, and through the above technical scheme, the problem that an insulating layer is easy to age when a power cable works at a high temperature, especially in an environment where the temperature changes frequently, in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power cable, in particular, it relates to a kind of high-temperature-resistant and ageing-resistant crosslinked polyethylene cable. BACKGROUND

[0002] Power cable is mainly used for transmitting power or signal transmission, and the insulation layer used outside the mainstream cable is mainly crosslinked polyethylene material at present, crosslinked polyethylene material is stable in nature, strong in insulation, and is widely used, but when high temperature is encountered, the insulation layer of crosslinked polyethylene material is prone to melting and ageing, in industry, the temperature of most working environments is high, for example, near boiler, welding equipment, etc., these devices all need to be powered through cable, and the part of cable moving with the device will be exposed to high temperature environment.

[0003] The metal cable core and the insulation layer inside the cable will all produce thermal expansion and cold shrinkage when the temperature changes, and in some high-temperature working environments, the temperature difference between the start and the shutdown of the device is large, and the thermal expansion and cold shrinkage change of the metal cable core and the change of the insulation layer are quite different, so that the insulation layer will accumulate certain stress when the temperature changes repeatedly, and the insulation layer may be thermally oxidized, and the molecular structure changes at the same time, and the expansion coefficients of the cable core and the outer insulation layer inside the cable are different, temperature change will cause mechanical stress inside to cause the insulation layer and the cable core to peel off, crack, etc., which is a common failure of power cable in high-temperature environment, in order to prolong the service life of power cable in high-temperature environment and reduce the short-circuit and open-circuit of equipment, a power cable with longer service life in high-temperature environment is needed. SUMMARY

[0004] The present application provides a kind of high-temperature-resistant and ageing-resistant crosslinked polyethylene cable, to solve the problem that the insulation layer of power cable in prior art is easy to age when working in high temperature, especially in the environment with frequent temperature changes.

[0005] The technical scheme of the present application is as follows: The application discloses a high-temperature-resistant and aging-resistant crosslinked polyethylene cable, which comprises a cable core, an insulation layer and a device joint, and further comprises a butt joint section, locking rings and a heat insulation sleeve mechanism, the butt joint section is detachably sleeved on the insulation layer, the butt joint section is detachably connected with the device joint, a plurality of locking rings are detachably sleeved on the insulation layer, the locking rings are in contact with the insulation layer, a heat insulation sleeve mechanism is arranged between two adjacent locking rings, the locking rings are used for detachably sleeving the heat insulation sleeve mechanism on the cable, two ends of the heat insulation sleeve mechanism are detachably connected with the two locking rings respectively, the heat insulation sleeve mechanism comprises a protective layer, a plurality of heat exchange section assemblies and a plurality of expansion section assemblies, the heat exchange section assemblies and the expansion section assemblies are alternately arranged on the protective layer, the heat insulation sleeve mechanism is used for heat insulation of the cable and simultaneously protecting the cable when the length of the cable changes due to temperature change, the heat exchange section assemblies can diffuse the heat of the cable to the outside, the expansion section assemblies can expand or contract when the length of the cable changes, and then change with the length of the cable, and the butt joint section is detachably connected with the adjacent locking ring.

[0006] The locking ring is provided with an anti-skid layer, a connecting component one and a connecting component two, the anti-skid layer is arranged on one side of the locking ring in contact with the insulation layer, a plurality of connecting component ones are circumferentially arranged on the locking ring close to the insulation layer, a plurality of connecting component twos are circumferentially arranged on the side away from the insulation layer, the connecting component twos are used for detachably connecting with the protective layer, and the two sides of the locking ring are provided with the connecting component one and the connecting component two.

[0007] The heat insulation sleeve mechanism further comprises a plurality of metal inner heat conduction plates, the metal inner heat conduction plates are wound on the insulation layer, two ends of the metal inner heat conduction plates are detachably connected with the locking ring through the connecting component one, and the metal inner heat conduction plates can be twisted with the cable when the cable is bent.

[0008] The heat exchange section assembly comprises a plurality of heat exchange grooves which are circumferentially arranged on the protective layer, the metal outer heat conduction plates are connected with the heat exchange grooves, a plurality of strip-shaped protrusions are arranged on the side of the metal outer heat conduction plates away from the heat exchange grooves, and the heat exchange grooves and the metal outer heat conduction plates are spirally arranged on the protective layer.

[0009] The expansion section assembly comprises an inner turning annular groove and an outer turning annular groove, a plurality of inner turning annular grooves are equidistantly arranged on one side of the protective layer close to the metal inner heat conducting sheet, a plurality of outer turning annular grooves are arranged on the other side of the protective layer away from the metal inner heat conducting sheet, and the plurality of outer turning annular grooves are arranged on both sides of the inner turning annular groove, when the heat exchange section assemblies on both sides of the expansion section assembly are close to each other, the position of the inner turning annular groove arranged on the protective layer is bent and expanded towards the side away from the metal inner heat conducting sheet.

[0010] The metal inner heat conducting sheet is attached to the protective layer, when the protective layer is bent, the metal inner heat conducting sheet is bent along with the protective layer, when the position of the expansion section assembly arranged on the protective layer is expanded, a plurality of the metal inner heat conducting sheets are bent and expanded.

[0011] The other side of the protective layer away from the metal inner heat conducting sheet is provided with a threaded groove, the threaded groove is arranged between adjacent heat exchange grooves, and the threaded groove passes through the outer turning annular groove, when the position of the expansion section assembly arranged on the protective layer is expanded, the threaded groove at the expanded position can be opened towards the side away from the metal inner heat conducting sheet.

[0012] The butt joint section is fixedly connected with a protective sleeve layer, the heat exchange groove is arranged in the protective sleeve layer, the metal outer heat conducting sheet is arranged in the heat exchange groove, and the protective sleeve layer is detachably connected with the locking sleeve ring.

[0013] The working principle and beneficial effects of the present application are as follows: 1. In the present application, the locking sleeve ring is arranged on the fixed position of the insulation layer, and can move according to the change of the thermal expansion effect of the cable, thereby driving the heat insulation sleeve mechanism to wrap the cable at any time. 2. In the present application, the heat exchange section assembly is arranged to be in contact with the insulation layer at any time, and the heat is uniformly transmitted, thereby improving the heat dissipation efficiency of the cable. The expansion section assembly can expand to accommodate the excessive length of the protective layer when the cable is shortened, and the heat exchange section can be attached to the insulation layer at any time. The present application is provided with a detachable and adjustable length outer sleeve outside the cable, which can protect the cable from the overheated environment on one hand, and improve the heat dissipation speed of the cable on the other hand. On the other hand, the cable length may change in a large temperature range, and the cable is protected at any time. The range of the cable length change can be reduced by protection, thereby avoiding the influence of the large stress on the service life of the insulation layer. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0015] Figure 1 It is the whole structure schematic diagram in the application; Figure 2 It is another view structure schematic diagram of the whole in the application; Figure 3 It is the local structure schematic diagram of the protective sleeve and the locking ring cooperation in the application; Figure 4 It is the local structure schematic diagram of the everted annular groove and the thread groove cooperation in the application; Figure 5 It is the local internal section structure schematic diagram of the protective layer and the locking ring cooperation in the application; Figure 6 It is the local internal section structure schematic diagram of the inverted annular groove and the everted annular groove cooperation in the application.

[0016] In the figure: 1, cable core; 2, insulation layer; 3, equipment joint; 4, butt joint section; 5, locking ring; 6, protective layer; 7, anti-skid layer; 8, connecting component one; 9, connecting component two; 10, metal inner heat conducting sheet; 11, heat exchange groove; 12, metal outer heat conducting sheet; 13, inverted annular groove; 14, everted annular groove; 15, thread groove; 16, protective sleeve layer. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work, are involved in the protection scope of the application.

[0018] As Figures 1-6As shown, the embodiment proposes a high-temperature-resistant and aging-resistant crosslinked polyethylene cable, which comprises a cable core 1, an insulation layer 2 and a device joint 3, and further comprises a butt joint section 4, a locking collar 5 and a heat insulation wrapping mechanism, the butt joint section 4 is detachably sleeved on the insulation layer 2, the butt joint section 4 is detachably connected with the device joint 3, a plurality of locking collars 5 are detachably sleeved on the insulation layer 2, the locking collars 5 are in contact with the insulation layer 2, a heat insulation wrapping mechanism is arranged between adjacent two locking collars 5, the locking collars 5 are used for detachably sleeving the heat insulation wrapping mechanism on the cable, two ends of the heat insulation wrapping mechanism are detachably connected with the two locking collars 5 respectively, the heat insulation wrapping mechanism comprises a protective layer 6, a plurality of heat exchange section assemblies and a plurality of expansion section assemblies, the plurality of heat exchange section assemblies and the plurality of expansion section assemblies are arranged on the protective layer 6 in an interlaced manner, the heat insulation wrapping mechanism is used for heat insulation of the cable, and meanwhile, the protection of the cable is maintained when the length of the cable changes due to temperature change, the heat exchange section assembly can diffuse the heat of the cable to the outside, the expansion section assembly can expand or contract when the length of the cable changes, and then changes with the length of the cable, the butt joint section 4 is detachably connected with the adjacent locking collar 5, the high-temperature-resistant and aging-resistant cable proposed in the application is mainly applied to the scene of power supply to the device in a high-temperature environment, the temperature of the device is extremely high during use, and when the device is stopped or temporarily reduced in temperature, the temperature of the cable will fluctuate in a large range, so that the aging speed of the insulation layer 2 outside the cable is accelerated, the heat insulation wrapping mechanism is sleeved outside the cable in the application, the whole cable is protected, the butt joint section 4 is fixed with the device joint 3 connected with the device on the cable, the whole cable is heat insulated and protected, when the temperature inside the cable rises, the expansion section assembly is stretched and lengthened, and the heat exchange section assembly tightly grips the cable core 1 inside the cable to dissipate heat, so as to avoid that the external heat has too great influence on the cable and the mechanical stress damage of the heat of the cable inside to the insulation layer 2 is reduced, the heat dissipation of the cable is accelerated, the temperature is adjusted to prolong the service life of the cable.

[0019] As Figures 2-5 shown, the locking collar 5 is provided with an anti-skid layer 7, a connecting component one 8 and a connecting component two 9, the anti-skid layer 7 is arranged on the side of the locking collar 5 in contact with the insulation layer 2, a plurality of connecting component ones 8 are arranged in a circle on the locking collar 5 at the position close to the insulation layer 2, a plurality of connecting component twos 9 are arranged in a circle on the side away from the insulation layer 2, the connecting component two 9 is used for detachable connection with the protective layer 6, the two sides of the locking collar 5 are provided with the connecting component one 8 and the connecting component two 9, the connecting component one 8 and the connecting component two 9 in the embodiment adopt bolts, the connecting component one 8 is connected with the locking collar 5 by the bolts penetrating through the end of the metal inner heat conduction piece 10, the connecting component two 9 is inserted into the protective layer 6 to prevent the protective layer 6 from being separated from the locking collar 5, the protective layer 6 can use a longer length one end, and in the actual production process, a plurality of protective sleeves can also be used.

[0020] As Figures 5-6 shown, the heat insulation sleeve mechanism further comprises a plurality of metal inner heat conduction sheets 10, which are wound on the insulation layer 2, and the two ends of the metal inner heat conduction sheets 10 are detachably connected with the locking ring 5 through the connecting member 8. When the cable is bent, the plurality of metal inner heat conduction sheets 10 can twist with the cable. In this embodiment, ten metal inner heat conduction sheets 10 are used, which twist and wind on the insulation layer 2. When the cable is bent, the metal inner heat conduction sheets 10 also bend and twist, and the metal inner heat conduction sheets 10 can transfer heat. When the cable generates heat or the ambient temperature is high, only one side has a higher temperature. The metal inner heat conduction sheets 10 can transfer heat to make the heat evenly dispersed, further improving the speed of heat diffusion. At the same time, due to the mutual twisting of the metal inner heat conduction sheets 10 and the smooth surface of the metal sheet, when the cable is elongated under the thermal expansion effect, the protective layer 6 is stretched and elongated by the cable. At this time, the metal inner heat conduction sheets 10 can act as a peristaltic layer to prevent the protective layer 6 from contacting the insulation layer 2. Since they are both made of rubber and are difficult to slide relative to each other, the protective layer 6 slides through the metal inner heat conduction sheets 10.

[0021] As Figures 3-6 shown, the heat exchange section assembly comprises a plurality of heat exchange grooves 11, which are circumferentially provided on the protective layer 6. The metal outer heat conduction sheet 12 is connected in the heat exchange groove 11. The metal outer heat conduction sheet 12 is provided with a plurality of strip-shaped protrusions on the side away from the heat exchange groove 11. The heat exchange groove 11 and the metal outer heat conduction sheet 12 are spirally wound on the protective layer 6. The heat exchange groove 11 is provided on the protective layer 6, which can make the protective layer 6 thinner at this position. The metal outer heat conduction sheet 12 can accelerate the conduction of heat to the air. The strip-shaped protrusions on the metal outer heat conduction sheet 12 can accelerate the diffusion of heat. Since the metal outer heat conduction sheet 12 is arranged in the heat exchange groove 11, when the temperature of the cable core 1 in the cable is low, the cable is shortened due to the thermal expansion effect. At this time, the protective layer 6 of the expansion section expands and becomes thick. The protective layer 6 of the heat exchange section is difficult to expand due to the presence of the metal outer heat conduction sheet 12, so that the metal outer heat conduction sheet 12 still contacts the metal inner heat conduction sheet 10 through the protective layer 6, maintaining the heat dissipation of the cable.

[0022] As Figures 4-6As shown, the expansion section assembly includes an inner turning annular groove 13 and an outer turning annular groove 14, a plurality of inner turning annular grooves 13 are equidistantly arranged on one side of the protective layer 6 close to the metal inner heat-conducting sheet 10, a plurality of outer turning annular grooves 14 are arranged on the side of the protective layer 6 away from the metal inner heat-conducting sheet 10, and the plurality of outer turning annular grooves 14 are arranged on both sides of the inner turning annular groove 13. When the heat exchange section assemblies on both sides of the expansion section assembly approach each other, the position of the protective layer 6 where the inner turning annular groove 13 is arranged bends and expands towards the side away from the metal inner heat-conducting sheet 10. Since the cable will shorten at a lower temperature, the protective layer 6 needs to expand to accommodate the excess part of the protective layer 6. Arranging the annular groove on the protective layer 6 is beneficial to the expansion of the protective layer 6. The position with the largest expansion degree is farthest from the cable, and the protective layer 6 at this position bends towards the cable, while the protective layers 6 on both sides bend away from the cable. The cooperation of the inner turning annular groove 13 and the outer turning annular groove 14 is more beneficial to the expansion of the protective layer 6. The metal inner heat-conducting sheet 10 is attached to the protective layer 6. When the protective layer 6 bends, the metal inner heat-conducting sheet 10 bends with the protective layer 6. When the position of the protective layer 6 where the expansion section assembly is arranged expands, the plurality of metal inner heat-conducting sheets 10 bend and expand.

[0023] As shown in Figures 3-4 , a threaded groove 15 is arranged on the side of the protective layer 6 away from the metal inner heat-conducting sheet 10. The threaded groove 15 is arranged between adjacent heat exchange grooves 11, and the threaded groove 15 passes through the outer turning annular groove 14. When the position of the protective layer 6 where the expansion section assembly is arranged expands, the threaded groove 15 at the expansion position can open towards the side away from the metal inner heat-conducting sheet 10. Arranging the threaded groove 15 can improve the stress of the protective layer 6 under torsion and bending. When the cable shortens under thermal expansion effect, the locking collars 5 at both ends of the protective layer 6 approach each other. At this time, the position of the protective layer 6 where the inner turning annular groove 13 is arranged expands away from the cable. Due to the arrangement of the threaded groove 15, the threaded groove 15 at the expansion position opens at this time. The thickness of the protective layer 6 does not affect the expansion of the protective layer 6 due to the stress between the inner and outer layers of the protective layer 6. At the same time, arranging the threaded groove 15 on the protective layer 6 can make the protective layer 6 better bend and twist with the cable.

[0024] As shown in Figures 1-2As shown, the butt joint section 4 is fixedly connected with a protective sleeve layer 16, the protective sleeve layer 16 has the same composition and structure as the protective layer 6, the protective sleeve layer 16 is not provided with the inner turning annular groove 13 and the outer turning annular groove 14, the heat exchange groove 11 is arranged on the protective sleeve layer 16, the metal outer heat conducting fin 12 is arranged in the heat exchange groove 11, the protective sleeve layer 16 is detachably connected with the locking sleeve ring 5, when installing, the protective sleeve and the locking sleeve ring 5 and the metal inner heat conducting fin 10 can be all sleeved on the cable connected with the equipment, at this time, the equipment connector 3 is arranged on the cable, the butt joint section 4 is connected with the equipment connector 3, so that the end of the cable close to the equipment and the environment temperature is protected.

[0025] In the embodiment, the butt joint section 4 is connected with the equipment connector 3, the locking sleeve ring 5 is fixedly sleeved on the cable, the protective layer 6 is sleeved on the cable, and the two ends of the protective layer 6 are fixed through the connecting component two 9 and the locking sleeve ring 5 and are connected with the metal inner heat conducting fin 10 through the connecting component one 8, when the environment temperature is high, the protective layer 6 isolates the temperature of the outside, reduces the temperature rise of the cable, when the temperature continuously rises or the cable continuously transports a large amount of power to make the temperature of the cable core 1 rise, at this time, due to the thermal expansion principle, the length of the cable in the axial direction becomes long and pulls the two locking sleeve rings 5 away from each other, at this time, the protective layer 6 is stretched, the positions of the protective layer 6 provided with the inner turning annular groove 13 and the outer turning annular groove 14 gradually fit the cable, when the temperature decreases, the length of the cable returns to normal, at this time, the positions of the protective layer 6 provided with the inner turning annular groove 13 and the outer turning annular groove 14 gradually expand and bend away from the cable, the metal inner heat conducting fin 10 contacts the insulation layer 2 and uniformly conducts heat to each position, at the same time, the metal outer heat conducting fin 12 diffuses heat to the air, accelerates the cooling of the cable, and the metal inner heat conducting fin 10 close to the metal outer heat conducting fin 12 is always in contact with the insulation layer 2, so that the heat diffusion efficiency is ensured.

[0026] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high temperature and ageing resistant crosslinked polyethylene cable comprising a core (1), an insulation layer (2) and a device joint (3), characterised in that, Also include: The butt joint section (4) is detachably sleeved on the insulation layer (2), and the butt joint section (4) is detachably connected with the equipment joint (3); A plurality of locking collars (5) are detachably sleeved on the insulation layer (2), the locking collars (5) are in contact with the insulation layer (2), and heat insulation sleeve mechanisms are arranged between adjacent two locking collars (5), and the locking collars (5) are used for fixing the heat insulation sleeve mechanisms on the cable; Two ends of the heat insulation sleeve mechanism are detachably connected with two locking collars (5) respectively, the heat insulation sleeve mechanism comprises a protective layer (6), a plurality of heat exchange section assemblies and a plurality of expansion section assemblies, a plurality of the heat exchange section assemblies and a plurality of the expansion section assemblies are staggered on the protective layer (6), the heat insulation sleeve mechanism is used for heat insulation of the cable, and meanwhile, the protection of the cable is maintained when the length of the cable changes due to temperature change; The heat exchange section assembly can diffuse the heat of the cable to the outside, and the expansion section assembly can expand or contract when the length of the cable changes, so that the length of the cable changes; The butt joint section (4) is detachably connected with the adjacent locking collar (5).

2. The high temperature resistant and aging resistant crosslinked polyethylene cable according to claim 1, characterized in that, The locking collar (5) is provided with: An antiskid layer (7) is arranged on the side of the locking collar (5) in contact with the insulation layer (2); A plurality of connection components one (8) are circumferentially arranged on the locking collar (5) close to the insulation layer (2); A plurality of connection components two (9) are circumferentially arranged on the side away from the insulation layer (2), and the connection components two (9) are used for detachably connecting with the protective layer (6); The two sides of the locking collar (5) are provided with the connection components one (8) and the connection components two (9).

3. A high temperature and ageing resistant crosslinked polyethylene cable according to claim 2, characterized in that, The heat insulation sleeve mechanism further comprises a plurality of metal inner heat conducting sheets (10), a plurality of the metal inner heat conducting sheets (10) are wrapped around the insulation layer (2), and the two ends of the metal inner heat conducting sheet (10) are detachably connected with the locking collar (5) through the connection components one (8), when the cable is bent, a plurality of the metal inner heat conducting sheets (10) can be twisted with the cable.

4. The high temperature and aging resistant crosslinked polyethylene cable according to claim 3, characterized in that, The heat exchange section assembly comprises a plurality of heat exchange grooves (11) circumferentially arranged on the protective layer (6), and a metal outer heat conducting sheet (12) is connected in each heat exchange groove (11), a plurality of strip-shaped protrusions are arranged on the side of the metal outer heat conducting sheet (12) away from the heat exchange groove (11), and the heat exchange groove (11) and the metal outer heat conducting sheet (12) are spirally arranged on the protective layer (6).

5. A high temperature and ageing resistant crosslinked polyethylene cable according to claim 4, characterized in that, The expansion section assembly comprises: A plurality of inner turning annular grooves (13) are equidistantly arranged on the side of the protective layer (6) close to the metal inner heat conducting sheet (10); A plurality of outer turning annular grooves (14) are arranged on the side of the protective layer (6) away from the metal inner heat conducting sheet (10), and a plurality of the outer turning annular grooves (14) are arranged on the two sides of the inner turning annular groove (13) respectively; When the heat exchange section assemblies on both sides of the expansion section assembly are close to each other, the position of the inner annular groove (13) on the protective layer (6) is bent and expanded towards the side away from the metal inner heat conducting sheet (10).

6. A high temperature and ageing resistant crosslinked polyethylene cable according to claim 5, characterized in that, The metal inner heat conducting sheet (10) is attached to the protective layer (6), when the protective layer (6) is bent, the metal inner heat conducting sheet (10) is bent along with the protective layer (6), when the position of the expansion section assembly on the protective layer (6) is expanded, multiple metal inner heat conducting sheets (10) are bent and expanded.

7. A high temperature and ageing resistant crosslinked polyethylene cable according to claim 6, characterized in that, The side of the protective layer (6) away from the metal inner heat conducting sheet (10) is provided with a threaded groove (15), the threaded groove (15) is arranged between adjacent heat exchange grooves (11), and the threaded groove (15) passes through the outer annular groove (14), when the position of the expansion section assembly on the protective layer (6) is expanded, the threaded groove (15) at the expansion position can be opened towards the side away from the metal inner heat conducting sheet (10).

8. A high temperature and ageing resistant crosslinked polyethylene cable according to claim 7, characterized in that, The butt joint section (4) is fixedly connected with a protective sleeve layer (16), the protective sleeve layer (16) is provided with the heat exchange groove (11), the heat exchange groove (11) is provided with the metal outer heat conducting sheet (12), and the protective sleeve layer (16) is detachably connected with the locking sleeve ring (5).

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