A preparation method of cross-linked polyethylene insulated power cable and cooling device thereof

Abstract

The present invention relates to the field of cross-linked polyethylene power cable manufacturing, and discloses a method for preparing a cross-linked polyethylene insulated power cable. The cable comprises a conductor core, a filling layer, a tape layer, an inner cushion layer, an armor layer and a protective sheath layer from the inside to the outside, and the conductor core comprises a conductor, an insulating layer and a shielding layer. The present invention has the following advantages and effects: the cooling water of the cooling device is cooled by absorbing heat through a heat exchange mechanism, and the absorbed heat is used to preheat the water supplied to the steam generator, thereby improving the utilization rate of thermal energy; the flexible pipe body connected to both ends of the rigid pipe body allows the circulating water pipe to rotate, and when the cooling temperature does not need to be dispersed through the circulating pipe, the circulating water pipe is rotated by pulling the rope, so that the circulating water pipe is rotated into the positioning groove, thereby improving the thermal insulation effect of the cooling temperature zone that needs to be cooled under high temperature regulation.

Description

Technical Field

[0001] The invention relates to the field of cross-linked polyethylene power cable manufacturing, and in particular to a preparation method of a cross-linked polyethylene insulated power cable and a cooling device thereof. Background Art

[0002] Cross-linked polyethylene insulated power cables have been widely welcomed by users due to their excellent electrical and mechanical properties, simple production process, light structure, large transmission capacity, convenient installation and maintenance, and no restrictions on drop. Especially with the rapid development of my country's national economy and the continuous deepening of infrastructure construction, the demand for electricity has increased sharply, and the use of cross-linked polyethylene insulated power cable products has also increased significantly year by year. When producing cables, the insulating material is melted and attached to the outside of the copper core of the cable to form an insulating layer. For the outer wall of the cable with multiple conductor cores, plastic is extruded on the outside of the completed cable to form an extruded protective sleeve. After the extruded insulating layer and protective sleeve, the cable needs to be cooled by cooling water. In the existing technology, the heat consumed by cooling is directly dissipated into the air, causing waste. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a cross-linked polyethylene insulated power cable, which has the effect of improving the utilization rate of thermal energy.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: a preparation method of a cross-linked polyethylene insulated power cable, the cable comprises a conductor core, a filling layer, a tape layer, an inner cushion layer, an armor layer and a protective sheath layer from the inside to the outside, the conductor core comprises a conductor, an insulating layer and a shielding layer, the conductor comprises a plurality of conductor cores, each conductor core is formed by twisting a plurality of conductors, each conductor core is coated with the insulating layer and the shielding layer, the insulating layer is arranged between the conductor core and the shielding layer, the manufacturing method of the cable comprises the following steps:

[0005] S1 twisting, twisting multiple wires into a conductor core through a disc twisting machine;

[0006] S2 extrudes insulation, adopts a double-layer co-extrusion process to extrude a polyethylene insulation sleeve and a polyethylene shielding sleeve on the conductor core to cover the conductor core, and the extrusion material is cross-linked polyethylene;

[0007] S3 multi-stage cooling, cooling the cable after the insulation extrusion step by means of a cooling device, wherein the cooling device is provided with a plurality of cooling temperature zones, and the temperature of the cooling temperature zones gradually decreases along the moving direction of the cable;

[0008] S4 steam cross-linking, cross-linking the finished grade insulated cable with warm water in a steam room, and a steam generator provides steam to the steam room;

[0009] S5 wrapping shielding layer, wrapping copper tape on the surface of the cable that has completed warm water cross-linking through a metal shield wrapping machine to form a shielding layer;

[0010] S6 twists the wires into cables, and passes the multiple wire cores wrapped with shielding layers through a cabling machine to form cables;

[0011] S7: Wrapping the filling layer, using a wrapping machine to wrap the filling layer around the outer wall of the cable that has completed the cabling step to fill the entire circle, and the wrapping layer material is polypropylene mesh fiber rope;

[0012] S8 wraps the inner cushion layer and uses a wrapping machine to wrap the PVC tape around the outer wall of the cable that has completed the filling layer wrapping step;

[0013] S9 armoring, using a cable armoring machine to armor the outer wall of the cable that has been wrapped around the inner cushion layer, and the armoring material is steel strip;

[0014] S10 extruded sheath, using a plastic extruder to extrude a protective sheath on the outer wall of the completed armored cable. The material of the protective sheath is polyvinyl chloride;

[0015] S11 protective sleeve cooling, cooling the cable after the protective sleeve is extruded by a cooling device, wherein a single cooling temperature zone is arranged in the cooling device;

[0016] The cooling device in step S3 and step S11 is provided with a heat exchange mechanism, and the heat exchange mechanism uses the heat of the cooling water in the cooling device to preheat the water supplied to the steam generator.

[0017] By adopting the above technical scheme, in the insulation extrusion step, the cross-linked polyethylene is melt-extruded into a polyethylene insulating sleeve and a polyethylene shielding sleeve through an extruder. In order to ensure the cross-linking effect and the surface gloss of the cable insulation, the head temperature of the extruder in step S2 is controlled at 210°C-240°C. The cross-linked material is suddenly cooled during the extrusion process, which will affect its insulation performance. Therefore, the present invention creates a cooling device with multiple temperature zones, and the temperature of the cooling temperature zone gradually decreases along the moving direction of the cable, so that the cable is gradually cooled; on the other hand, the protective sleeve located in the outermost layer is far away from the conductor core, and the technical requirements of the protective sleeve are relatively low. In step S10, the extrusion temperature of the plastic extruder when extruding the protective sleeve is below 180°C, and only a single cooling temperature zone needs to be directly cooled with cold water; the cooling water of the cooling device is cooled by absorbing heat through a heat exchange mechanism, and the absorbed heat is used to preheat the water supplied to the steam generator, thereby improving the utilization rate of thermal energy.

[0018] The present invention also discloses a cooling device, which is applied to step S3 and step S11 in the above method, including a cooling water trough and a water receiving trough respectively connected to both ends of the cooling water trough, a plurality of partition plates are detachably connected in the cooling water trough, a cooling temperature zone is arranged between two adjacent partition plates, wire troughs for cables to pass through are respectively arranged at both ends of the cooling water trough and the water receiving trough, a guide groove for cables to pass through is arranged on the partition plate, a circulating water pipe located at the bottom of the cooling water trough is connected between the two adjacent partition plates, a circulating water pipe is fixedly connected to the circulating water pipe, a heat exchange trough is fixedly connected to the bottom of the cooling water trough, a water inlet pipe and a water outlet pipe are respectively connected to both ends of the heat exchange trough, and the circulating water pipe extends into the heat exchange trough.

[0019] By adopting the above technical scheme, the detachable partition plate divides the cooling water tank into multiple cooling temperature zones, and cooling water is set in the cooling water tank. By setting cooling water of different temperatures in different cooling temperature zones, the cable passes through the cable trough and is immersed in the cooling water to complete gradual cooling. The temperature of the cooling water that absorbs the heat of the cable increases, and the circulating pump drives the cooling water to circulate in the circulating water pipe so that the temperature distribution of the cooling water in the cooling temperature zone is uniform. At the same time, hot water is set in the heat exchange water tank to flow from the water inlet pipe and out of the water outlet pipe, and the circulating water pipe is immersed in the hot water. The hot water cools the cooling water, and the cooling speed of the cooling water is adjusted by adjusting the flow speed of the cooling water in the circulating water pipe through the circulating pump, and the hot water flowing out of the outlet is supplied to the steam generator.

[0020] The present invention is further configured as follows: return water pipes are fixedly connected to both ends of the cooling water trough, one end of the return water pipe is connected to the bottom of the water receiving trough and the other end is located above the cooling water trough, a return water pump is connected to the return water pipe, and an induction heater is provided on the port of the return water pipe away from the water receiving trough.

[0021] By adopting the above technical solution, the cooling water overflowing from the cooling water tank enters the water receiving tank, and the return water pump continuously inputs the cooling water in the water receiving tank into the cooling water tank through the return water pipe, so that the liquid level in the cooling water tank is higher than the cable tank, and the cooling water can continuously submerge the cable. For step S3, the cable needs to be gradually cooled, and the cooling temperature is from high to low. Therefore, at the beginning of the cooling stage, the cooling temperature zone at the cable entrance needs to be kept at a high temperature. When the cooling water temperature in the cooling temperature zone is too low, the return pipe end of the metal conductor material is heated by the induction heater, thereby increasing the temperature of the cooling water entering the cooling water tank.

[0022] The present invention is further configured as follows: it also includes a controller, a temperature sensor connected to the bottom of the cooling water tank is arranged between two adjacent partitions, and the induction heater, circulation pump, return water pump and temperature sensor are respectively connected to the controller.

[0023] By adopting the above technical solution, the controller controls the return water pump to work continuously, and the temperature sensor senses the water temperature in the cooling temperature zone. When the water temperature in the cooling temperature zone is too high, the controller increases the temperature of the circulation pump. When the water temperature in the cooling temperature zone is too low, the controller controls the induction heater to start heating the cooling water entering the cooling temperature zone.

[0024] The present invention is further configured as follows: a thermal insulation layer is arranged inside the outer walls of the cooling water trough and the water receiving trough, the circulating water pipe comprises a rigid pipe body and a flexible pipe body respectively connected to both ends of the rigid pipe body, the two ends of the flexible pipe body are respectively connected to the bottom of the cooling water trough and the water outlet of the circulating pump, the bottom of the cooling water trough is provided with a positioning groove for the rigid pipe body to be rotatably embedded, a pulling rope is fixedly connected to the outer wall of the rigid pipe body, the bottom of the cooling water trough is provided with a rope cavity located in the thermal insulation layer, the end of the rope cavity is connected to the positioning groove, and the pulling rope passes through and extends out of the rope cavity.

[0025] By adopting the above technical solution, the flexible pipe body connected to the two ends of the rigid pipe body allows the circulating water pipe to rotate. When the cooling temperature does not need to be dissipated through the circulating pipe, the circulating water pipe is rotated by pulling the rope, so that the circulating water pipe rotates into the positioning groove.

[0026] The present invention is further configured as follows: the rigid tube body is configured as a broken line shape.

[0027] The present invention is further configured as follows: an adjusting rod is fixedly connected to the heat exchange water tank, an adjusting frame is fixedly connected to the outer wall of the cooling water tank, an adjusting hole is provided on the adjusting frame for the adjusting rod to pass through, and an adjusting nut is threadedly connected to one end of the adjusting rod extending out of the adjusting hole.

[0028] By adopting the above technical solution, the adjusting rod passes through the adjusting hole and is threadedly connected to the adjusting nut to limit the falling of the heat exchange water tank, thereby realizing the connection of the heat exchange water tank to the bottom of the cooling water tank. The distance between the heat exchange water tank and the cooling water tank is adjusted by rotating the adjusting nut, thereby adjusting the depth of the circulating water pipe immersed in the heat exchange water tank, thereby adjusting the cooling efficiency of the circulating water pipe.

[0029] The present invention is further configured as follows: a support frame located in the guide groove is fixedly connected to the partition plate, and a guide wheel is rotatably connected to the support frame.

[0030] By adopting the above technical solution, the cable immersed in the cooling water contacts the outer wall of the guide wheel, and the guide wheel guides and supports the moving cable.

[0031] The present invention is further configured as follows: a filter screen is provided at the bottom of the cooling water tank and located at the water inlet of the circulating water pipe.

[0032] By adopting the above technical solution, a filter screen is arranged at the end of the circulating water pipe to filter the scale generated in the cooling water.

[0033] The present invention is further configured as follows: the inner wall of the cooling water trough is provided with connecting slide grooves for inserting two sides of the partition plate respectively.

[0034] By adopting the above technical solution, the partition plate is slidably inserted into the connecting groove to realize the detachable connection of the partition plate in the cooling water tank.

[0035] The beneficial effects of the present invention are:

[0036] 1. The cooling water of the cooling device is cooled by absorbing heat through the heat exchange mechanism, and the absorbed heat is used to preheat the water supplied to the steam generator, thereby improving the utilization rate of thermal energy;

[0037] 2. The flexible pipe body connected to both ends of the rigid pipe body allows the circulating water pipe to rotate. When the cooling temperature does not need to be radiated through the circulating pipe, the circulating water pipe is rotated by pulling the rope, so that the circulating water pipe rotates into the positioning groove, thereby improving the insulation effect of the cooling temperature zone that needs to be cooled down under high temperature regulation;

[0038] 3. The distance between the heat exchange water tank and the cooling water tank is adjusted by rotating the adjusting nut, thereby adjusting the depth of the circulating water pipe immersed in the heat exchange water tank, thereby adjusting the cooling efficiency of the circulating water pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 Schematic diagram of the structure of the cable of this embodiment.

[0041] Figure 2 It is a schematic diagram of the structure of the cooling device of this embodiment.

[0042] Figure 3 Schematic diagram of the internal structure of the cooling device of this embodiment.

[0043] Figure 4 It is a schematic diagram of the structure of the pulling rope and the circulating water pipe when the circulating water pipe of this embodiment extends into the heat exchange water tank.

[0044] Figure 5 It is a schematic diagram of the structure of the pulling rope and the circulating water pipe when the circulating water pipe of this embodiment extends into the positioning groove.

[0045] Figure 6 It is a schematic diagram of the structure of the circulating water pipe in this embodiment.

[0046] Figure 7 Schematic diagram of the connection relationship of the circulating water pipe in this embodiment.

[0047] Figure 8 It is a schematic diagram of the position relationship of the circulating water pipe when the circulating water pipe of this embodiment extends into the positioning groove.

[0048] In the figure, 1, conductor core; 11, conductor; 12, insulation layer; 121, polyethylene insulation sleeve; 122, polyethylene shielding sleeve; 13, shielding layer; 2, filling layer; 3, tape layer; 4, inner cushion layer; 5, armor layer; 6, protective sleeve layer; 7, cooling water tank; 71, water tank; 711, guide groove; 712, adjustment frame; 714, connecting slide; 715, support frame; 716, guide wheel; 72, partition plate; 721. Wire duct; 73. Cooling temperature zone; 74. Circulating water pipe; 741. Circulating pump; 742. Filter; 743. Rigid pipe body; 744. Flexible pipe body; 75. Return pipe; 751. Return pump; 76. Induction heater; 77. Temperature sensor; 78. Rope cavity; 79. Positioning groove; 8. Heat exchange water tank; 81. Water inlet pipe; 82. Water outlet pipe; 83. Adjustment rod; 84. Adjustment nut; 9. Pull rope. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Embodiment, a method for preparing a cross-linked polyethylene insulated power cable, such as Figure 1 As shown, the cable includes a conductor core 1, a filling layer 2, a tape layer 3, an inner cushion layer 4, an armor layer 5 and a protective sheath layer 6 from the inside to the outside. The conductor core 1 includes a conductor 11, an insulating layer 12 and a shielding layer 13. The conductor 11 includes a plurality of conductor 11 cores, each of which is formed by twisting a plurality of conductors. Each of the conductor 11 cores is coated with an insulating layer 12 and a shielding layer 13. The insulating layer 12 is arranged between the conductor 11 core and the shielding layer 13. The manufacturing method of the cable includes the following steps:

[0051] S1 twisting, twisting multiple wires into a conductor 11 cores through a disc twisting machine, the wires are made of copper or aluminum;

[0052] S2 extruded insulation, using a double-layer co-extrusion process to extrude a polyethylene insulation sleeve 121 and a polyethylene shielding sleeve 122 to cover the conductor 11 core to form an insulation layer 12, and the extrusion material is cross-linked polyethylene;

[0053] The polyethylene insulating sleeve 121 and the polyethylene shielding sleeve 122 are extruded simultaneously by an extruder, and the polyethylene shielding sleeve 122 is arranged inside the polyethylene insulating sleeve 121; the extrusion temperature of the extruder for extruding the polyethylene shielding sleeve 122 is divided into 6 zones, including 4 zones for the body, which are 110℃-130℃, 120℃-140℃, 130℃-150℃ and 140℃-160℃, and 2 zones for the head, which are 145℃-165℃ and 1 50℃-170℃; the extrusion temperature of the extruder for extruding the polyethylene insulating sleeve 121 is divided into 10 zones, 6 zones of the fuselage, respectively 150℃-170℃, 160℃-180℃, 170℃-190℃, 180℃-200℃, 190℃-210℃ and 200℃-220℃, 4 zones of the head, respectively 200℃-220℃, 210℃-230℃, 220℃-240℃ and 230℃-250℃;

[0054] S3 multi-stage cooling, cooling the cable after the insulation extrusion step by a cooling device, wherein the cooling device is provided with four cooling temperature zones 73, which are 90°C-75°C, 65°C-50°C, 45°C-30°C and 30°C-20°C respectively, and the temperature of the cooling temperature zone 73 gradually decreases along the moving direction of the cable;

[0055] S4 steam cross-linking, cross-linking the finished grade insulated cable with warm water in a steam room, with a steam generator providing steam for the steam room; the cross-linking steam temperature is 90±5℃, the time is 6-8 hours, and an insulating layer 12 is formed;

[0056] S5 wrapping the shielding layer 13, wrapping the copper tape on the surface of the cable that has completed warm water cross-linking by a metal shielding wrapping machine to form a shielding layer 13;

[0057] S6: twisting the plurality of conductor cores 1 wrapped with the shielding layer 13 into cables through a cabling machine;

[0058] S7: wrapping the filling layer 2, using a wrapping machine to wrap the filling layer 2 around the outer wall of the cable that has completed the cabling step to fill the entire circle, and the out-of-roundness does not exceed 4%. The wrapping layer material is a polypropylene mesh fiber rope;

[0059] S8 Winding the inner cushion layer 4, using a wrapping machine to wrap the outer wall of the cable that has completed the step of winding the filling layer 2 with 3 layers of 0.4mm thick PVC tapes overlapping each other, with the overlapping gap not less than 20%;

[0060] S9 armoring, using a cable armoring machine to armor the outer wall of the cable that has been wrapped around the inner cushion layer 4, and the armoring material is steel strip;

[0061] S10 extruded sheath, through the plastic extruder to extrude the protective sheath on the outer wall of the completed armored cable, the material of the protective sheath is polyvinyl chloride, the plastic extruder is divided into 6 zones, including 4 zones of the fuselage, which are 120℃-140℃, 130℃-150℃, 140℃-160℃ and 140℃-160℃, and 2 zones of the head, which are 150℃-180℃ and 160℃-180℃ respectively;

[0062] S11: Cooling the protective sleeve, cooling the cable after extruding the protective sleeve by a cooling device, wherein a single cooling temperature zone 73 is provided in the cooling device, and the cooling temperature is 25°C-40°C;

[0063] The cooling device in step S3 and step S11 is provided with a heat exchange mechanism, and the heat exchange mechanism uses the heat of the cooling water in the cooling device to preheat the water supplied to the steam generator.

[0064] A cooling device, such as Figure 2 , Figure 3 As shown, it includes a cooling water tank 7 and water receiving tanks 71 respectively connected to both ends of the cooling water tank 7. A plurality of partition plates 72 are detachably connected in the cooling water tank 7. A cooling temperature zone 73 is provided between two adjacent partition plates 72. A wire groove 721 for cables to pass through is provided at both ends of the cooling water tank 7 and the water receiving tank 71. A guide groove 711 for cables to pass through is provided on the partition plate 72. The cable extends from one end of the cooling water tank 7 and extends from the other end of the cooling water tank 7. A circulating water pipe 74 located at the bottom of the cooling water tank 7 is connected in between, and a circulating pump 741 is fixedly connected to the circulating water pipe 74. A hot water exchange tank 8 is fixedly connected to the bottom of the cooling water tank 7. An inlet pipe 81 and an outlet pipe 82 are respectively connected to the two ends of the hot water exchange tank 8. The inlet pipe 81 is arranged on the hot water exchange tank 8 near the cooling water tank 7 for supplying cables to extend at one end, and the outlet pipe 82 is arranged on the hot water exchange tank 8 near the cooling water tank 7 for supplying cables to extend at one end, and the circulating water pipe 74 extends into the hot water exchange tank 8.

[0065] like Figure 4 , 6As shown, a filter screen 742 located at the water inlet of the circulating water pipe 74 is provided at the bottom of the cooling water tank 7. Return pipes 75 are fixedly connected to both ends of the cooling water tank 7, one end of the return pipe 75 is connected to the bottom of the water receiving tank 71 and the other end is located above the cooling water tank 7. A return pump 751 is connected to the return pipe 75, and an induction heater 76 is sleeved on the port of the return pipe 75 away from the water receiving tank 71. A controller is also included, and a temperature sensor 77 connected to the bottom of the cooling water tank 7 is provided between two adjacent partitions 72. The induction heater 76, the circulating pump 741, the return pump 751 and the temperature sensor 77 are respectively connected to the controller.

[0066] like Figure 4-5 As shown, the outer walls of the cooling water tank 7 and the water receiving tank 71 are provided with a heat preservation layer, and the circulating water pipe 74 includes a rigid pipe body 743 and a flexible pipe body 744 respectively connected to both ends of the rigid pipe body 743, and the rigid pipe body 743 is arranged in a broken line shape. The ends of the two flexible pipe bodies 744 are respectively connected to the bottom of the cooling water tank 7 and the water outlet of the circulating pump 741, and the bottom of the cooling water tank 7 is provided with a positioning groove 79 for the rigid pipe body 743 to rotate and embed, and the outer wall of the rigid pipe body 743 is fixedly connected with a pulling rope 9, and the bottom of the cooling water tank 7 is provided with a rope cavity 78 located in the heat preservation layer, and the end of the rope cavity 78 is connected to the positioning groove 79, and the pulling rope 9 passes through and extends out of the rope cavity 78.

[0067] like Figure 1 , Figure 2 As shown, an adjusting rod 83 is fixedly connected to the heat exchange water tank 8, and an adjusting frame 712 is fixedly connected to the outer wall of the cooling water tank 7. An adjusting hole for the adjusting rod 83 to pass through is provided on the adjusting frame 712, and an adjusting nut 84 is threadedly connected to one end of the adjusting rod 83 extending out of the adjusting hole. By rotating the adjusting nut 84, the distance between the heat exchange water tank 8 and the cooling water tank 7 is adjusted, thereby adjusting the depth of the circulating water pipe 74 immersed in the heat exchange water tank 8, and adjusting the cooling efficiency of the circulating water pipe 74.

[0068] like Figure 2 , Figure 3 As shown, the inner wall of the cooling water tank 7 is provided with connecting slide grooves 714 for inserting the two sides of the partition plate 72 respectively, and the partition plate 72 is fixedly connected to a support frame 715 located in the guide groove 711, and the support frame 715 is rotatably connected to a guide wheel 716.

[0069] When the cooling device is applied to step S3, Figure 7 , Figure 8As shown, cooling water of corresponding temperature is injected into each temperature zone in the cooling water tank 7, and the cooling water overflows from the line grooves 721 at both ends of the cooling water tank 7. The return pump 751 drives the cooling water from the water receiving groove 71 back to the cooling water tank 7, so that the liquid level of the cooling water in the cooling water tank 7 is continuously higher than the line groove 721, so as to keep the cooling water to keep the cable stably submerged. The circulating pump 741 drives the cooling water to circulate in the circulating water pipe so that the temperature distribution of the cooling water in the cooling temperature zone 73 is uniform. At the same time, room temperature hot water is set in the hot water tank 8 to flow into the water inlet pipe 81 and out of the water outlet pipe 82. The circulating water pipe is immersed in the hot water, and the hot water cools the cooling water. The cooling speed of the cooling water is adjusted by adjusting the flow speed of the cooling water in the circulating water pipe 74 by the circulating pump 741, and the hot water flowing out of the outlet is supplied to the steam generator. During use, the cooling water in the 90℃-75℃ temperature zone loses heat during the circulation between the cooling water trough 7 and the water receiving trough 71, and the 90℃-75℃ temperature zone and the 65℃-50℃ temperature zone lose heat at the connected wire trough 721, and the heating of the cooling water by the cable cannot heat the cooling water to more than 90℃. By pulling the rope located below the 90℃-75℃ temperature zone to pull the circulating water pipe 74 to rotate, the rigid tube body 743 is embedded in the positioning groove 79, thereby improving the thermal insulation effect of the 90℃-75℃ temperature zone. When the temperature sensor 77 detects that the temperature of the 90℃-75℃ temperature zone is lower than 75℃, the controller controls the induction heater 76 to heat the cooling water entering the 90℃-75℃ temperature zone.

[0070] When the cooling device is applied to step S11, Figure 3 As shown, the partition plate 72 between each temperature zone is taken out from the connecting slide 714, and the wire grooves 721 located at both ends of the cooling water tank 7 are used for the cable of the completed extruded sheath to pass through. Cooling water with a temperature of room temperature is set in the cooling water tank 7, and cooling water with a temperature of room temperature is introduced into the heat exchange water tank 8 from the water inlet pipe 81. The cable of the completed extruded sheath passes through the wire groove 721 of the cooling water tank 7, and the circulating pump 741 drives the cooling water to circulate in the circulating water pipes respectively so that the temperature distribution of the cooling water in the cooling temperature zone 73 is uniform. At the same time, room temperature heat exchange water is set in the heat exchange water tank 8 to flow into from the water inlet pipe 81 and out from the water outlet pipe 82. All the circulating water pipes are immersed in the heat exchange water, and the heat exchange water cools the cooling water. The cooling speed of the cooling water is adjusted by adjusting the flow speed of the cooling water in the circulating water pipe 74 by the circulating pump 741, and the heat exchange water flowing out from the outlet is supplied to the steam generator.

Claims

1. A cooling device for a cross-linked polyethylene insulated power cable, characterized in that: The invention comprises a cooling water trough (7) and water receiving troughs (71) respectively connected to both ends of the cooling water trough (7), a plurality of partition plates (72) are detachably connected in the cooling water trough (7), a cooling temperature zone (73) is arranged between two adjacent partition plates (72), a wire groove (721) for cables to pass through is respectively arranged at both ends of the cooling water trough (7) and the water receiving trough (71), and a guide groove (711) for cables to pass through is arranged on the partition plate (72), and the cooling water trough (7) is characterized in that: a heat exchange mechanism is arranged at the bottom of the cooling water trough (7) The heat exchange mechanism comprises a circulating water pipe (74) arranged between two adjacent partition plates (72) and located at the bottom of the cooling water tank (7); the circulating water pipe is connected to the bottom of the cooling water tank (7); a circulating pump (741) is fixedly connected to the circulating water pipe (74); a heat exchange tank (8) is fixedly connected to the bottom of the cooling water tank (7); two ends of the heat exchange tank (8) are respectively connected to a water inlet pipe (81) and a water outlet pipe (82); the circulating water pipe (74) extends into the heat exchange tank (8); The two ends of the cooling water trough (7) are respectively fixedly connected with a return water pipe (75), one end of the return water pipe (75) is connected to the bottom of the water receiving trough (71) and the other end is located above the cooling water trough (7), the return water pipe (75) is connected to a return water pump (751), and an induction heater (76) is sleeved on the end of the return water pipe (75) away from the water receiving trough (71); It also includes a controller, wherein a temperature sensor (77) connected to the bottom of the cooling water tank (7) is provided between two adjacent partition plates (72), and the induction heater (76), the circulation pump (741), the return water pump (751) and the temperature sensor (77) are respectively connected to the controller; The outer walls of the cooling water trough (7) and the water receiving trough (71) are provided with a heat-insulating layer. The circulating water pipe (74) comprises a rigid pipe body (743) and a flexible pipe body (744) respectively connected to the two ends of the rigid pipe body (743). The ends of the two flexible pipe bodies (744) are respectively connected to the bottom of the cooling water trough (7) and the water outlet of the circulating pump (741). The bottom of the cooling water trough (7) is provided with a positioning groove (79) for the rigid pipe body (743) to be rotatably embedded. The outer wall of the rigid pipe body (743) is fixedly connected with a pulling rope (9). The bottom of the cooling water trough (7) is provided with a rope cavity (78) located in the heat-insulating layer. The end of the rope cavity (78) is connected to the positioning groove (79). The pulling rope (9) passes through and extends out of the rope cavity (78).

2. The cooling device for a cross-linked polyethylene insulated power cable according to claim 1, characterized in that: The rigid tube body (743) is configured in a broken line shape.

3. The cooling device for a cross-linked polyethylene insulated power cable according to claim 1, characterized in that: An adjusting rod (83) is fixedly connected to the heat exchange water tank (8), an adjusting frame (712) is fixedly connected to the outer wall of the cooling water tank (7), an adjusting hole for the adjusting rod (83) to pass through is provided on the adjusting frame (712), and an adjusting nut (84) is threadedly connected to one end of the adjusting rod (83) extending through the adjusting hole.

4. The cooling device for a cross-linked polyethylene insulated power cable according to claim 1, characterized in that: A support frame (715) located in the guide groove (711) is fixedly connected to the partition plate (72), and a guide wheel (716) is rotatably connected to the support frame (715).

5. The cooling device for a cross-linked polyethylene insulated power cable according to claim 1, characterized in that: A filter screen (742) is provided at the bottom of the cooling water tank (7) and is located at the water inlet of the circulating water pipe (74).

6. The cooling device for a cross-linked polyethylene insulated power cable according to claim 1, characterized in that: The inner wall of the cooling water tank (7) is provided with connecting sliding grooves (714) for inserting two sides of the partition plate (72) respectively.

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