Self-cooled polyethylene insulated power cable

Abstract

The invention relates to the technical field of power cables, and provides a self-cooled polyethylene insulated power cable, which comprises an insulating sheath, a closed shell and a supporting cylinder, a plurality of insulated conductors are twisted in the insulating sheath, one side of each insulated conductor is moved out from one side of the insulating sheath, the closed shell is arranged on one side of the insulating sheath, and the supporting cylinder is arranged on the other side of the insulating sheath. One side of each insulated conductor penetrates through the closed shell, the supporting barrel is arranged in the closed shell, a flexible sleeve is arranged on the outer wall of the supporting barrel, one side of each insulated conductor is arranged on the flexible sleeve in a twisted mode, a heat exchange part is arranged in the supporting barrel and extends out of the supporting barrel, and the heat exchange part is divided into an evaporation area and a heat exchange area. According to the technical scheme, the problem that in the prior art, when a connecting port of a polyethylene insulated power cable is electrically connected with power equipment, heat of a plurality of insulated conductors at the connecting port is gathered in a sheath due to resistance difference is solved.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, and in particular to a self-cooling polyethylene insulated power cable. Background Art

[0002] Polyethylene insulated power cable is also known as YJV cable. Among them, polyethylene insulated power cable has excellent thermal-mechanical properties, excellent electrical properties and chemical corrosion resistance. It also has the advantages of simple structure, light weight, and laying without drop restrictions. It is a new type of cable widely used in urban power grids, mines and factories. The production process of polyethylene insulated power cable is first to twist the metal (mainly copper or aluminum) conductor, and then extrude a layer of polyethylene insulation on the outside of the conductor to form an insulated conductor, and then twist multiple insulated conductors together. After being wrapped with a wrapping layer, a filling layer and an armor layer, a layer of polyvinyl chloride sheath is extruded on the outermost side to complete the production and preparation of polyethylene insulated power cable.

[0003] In the prior art, polyethylene insulated power cables are used to electrically connect multiple large power equipment together. During the laying process of polyethylene insulated power cables, most of the polyethylene insulated power cables are usually moved underground or in cable troughs, but both sides of the polyethylene insulated power cables need to be electrically connected to the power equipment. Because the contact area between the twisted multiple insulated conductors inside the polyethylene insulated power cable is large, during the flow of current, the connection port of the polyethylene insulated power cable has a resistance difference with the power equipment, causing heat accumulation in the sheath of the multiple insulated conductors at the connection port, affecting the long-term use of the polyethylene insulated power cable. Summary of the invention

[0004] The present invention provides a self-cooling polyethylene insulated power cable, which solves the problem in the prior art that when the connection port of the polyethylene insulated power cable is electrically connected to power equipment, heat is accumulated in the sheath of multiple insulated conductors at the connection port due to resistance difference.

[0005] The technical solution of the present invention is as follows: a self-cooling polyethylene insulated power cable, comprising an insulating sheath, wherein a plurality of insulated conductors are twisted in the insulating sheath, and one side of the plurality of insulated conductors are moved out from one side of the insulating sheath, and further comprising: A closed shell, wherein one side of the insulating sheath is provided with the closed shell, and one side of the plurality of insulating conductors all penetrates the closed shell; A support cylinder, the support cylinder is arranged in the closed shell, the outer wall of the support cylinder is provided with a flexible sleeve, one side of the plurality of insulated conductors are twisted and arranged on the flexible sleeve, a heat exchanger is arranged in the support cylinder, the heat exchanger extends from the support cylinder, the heat exchanger is divided into an evaporation area and a heat exchange area, and the evaporation area of ​​the heat exchanger is located in the support cylinder; Wherein, the closed shell is provided with a plurality of extending grooves, and the heat exchange element is a heat exchange element whose heat exchange area extends into the extending grooves.

[0006] In order to seal the area where the insulated conductor extends out of the insulating sleeve, the closed shell further includes an annular groove frame, a circular plate body and an arc-shaped sealing plate. The annular groove frame is arranged on the outer wall of the insulating sleeve, and the circular plate body is connected to a plurality of connecting cylinders 24. The insulated conductor extends into the corresponding connecting cylinders 24. Two mounting groove frames are fixedly connected between the circular plate body and the annular groove frame. The supporting cylinder body is fixedly connected to the circular plate body. The number of the arc-shaped sealing plates is set to two. The two arc-shaped sealing plates are arranged between the two mounting groove frames. The annular groove frame and the circular plate body are kept closed by the two arc-shaped sealing plates. The extended groove is connected to the arc-shaped sealing plate.

[0007] In order to keep the insulated conductor fixed in the closed shell, further, a plurality of flexible extrusion strips are arranged on the inner arc surface of the arc-shaped sealing plate, the flexible extrusion strips are in contact with the insulated conductor, a spiral groove is opened on the outer wall of the flexible sleeve, and the insulated conductor is located in the corresponding spiral groove.

[0008] In order to make it easier to fix the insulated conductor on the flexible sleeve, further, the support cylinder and the side of the flexible sleeve close to the insulating sheath are both set to be conical, and a circular cover plate is provided on the side of the support cylinder away from the insulating sheath. The heat exchange element passes through the circular cover plate, and the circular cover plate keeps the support cylinder closed.

[0009] In order to cool the insulated conductor, further, the support cylinder may be filled with heat dissipation filler.

[0010] In order to install the heat exchanger, further, a plurality of mounting ring sleeves are provided in the support cylinder, and the mounting ring sleeves are fixedly connected to the side wall of the support cylinder through connecting rods, and the evaporation area of ​​the heat exchanger is fixedly connected in the plurality of mounting ring sleeves.

[0011] In order to improve the heat exchange effect of the heat exchange element, further, a plurality of heat exchange grooves are opened on the circumference of the evaporation area of ​​the heat exchange element, and the heat exchange grooves are used to increase the surface area of ​​the evaporation area. The heat exchange element is filled with circulating liquid.

[0012] In order to allow the heat in the heat exchanger to evaporate in time, further, a conical cylinder is fixedly connected in the heat exchange area of ​​the heat exchanger, and a plurality of U-shaped tubes are connected between the heat exchange area and the conical cylinder. The U-shaped tube extends into the insertable groove, the input end of the U-shaped tube is connected to the conical cylinder, and the output end of the U-shaped tube is connected to the heat exchange area.

[0013] In order to volatilize the heat of the U-shaped tube, further, a plurality of heat dissipation fins are fixedly connected between the extended groove and the U-shaped tube.

[0014] The working principle and beneficial effects of the present invention are: In the present invention, after a plurality of insulated conductors are electrically connected to an electrical device, in order to solve the problem of heat accumulation at the connection port of the insulated conductors after the insulated conductors are electrically connected to the electrical device, one side area of ​​the plurality of insulated conductors is removed from the insulating sleeve so that the insulated conductors are twisted on the flexible sleeve, one side of the insulated conductor is removed from the closed shell, and the insulated conductor is fixed with an arc-shaped sealing plate. When heat is generated during the operation of the insulated conductor, the heat of the insulated conductor is transferred to the heat dissipation filler in the supporting cylinder, and then the circulating liquid in the evaporation area of ​​the heat dissipation element evaporates into gas, and then during the flow of the evaporated gas in the heat exchange element, the evaporated gas enters a plurality of U-shaped tubes for condensation, so that the condensed circulating liquid flows back into the evaporation area, and the heat exchange operation is performed through the heat exchange element to realize volatilization of the heat generated during the operation of the insulated conductor, thereby effectively solving the problem of heat accumulation at the connection port of the plurality of insulated conductors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of a partial cross-section of the present invention; Figure 3 It is a partial cross-sectional structural diagram of the cooperation of the annular groove frame, the supporting cylinder, the flexible sleeve, the inserted groove and the U-shaped tube in the present invention; Figure 4 It is a schematic diagram of the structure of the flexible sleeve, the inserted groove and the U-shaped tube in the present invention; Figure 5 It is a schematic diagram of a partial cross-section of the structure of the supporting cylinder, the flexible sleeve, the inserted groove and the U-shaped tube in the present invention; Figure 6 It is a schematic diagram of a partial cross-section of the structure of the heat exchange element, the U-shaped tube, the evaporation area and the heat exchange area in the present invention; Figure 7 It is a partial cross-sectional structural diagram of the cooperation of the annular groove frame, the circular plate body, the mounting groove frame and the arc-shaped sealing plate in the present invention.

[0017] In the figure: 1. insulating sheath; 2. insulating conductor; 3. supporting cylinder; 4. flexible sleeve; 5. heat exchanger; 6. evaporation area; 7. heat exchange area; 8. extended groove; 9. annular groove frame; 10. circular plate; 11. mounting groove frame; 12. arc-shaped sealing plate; 13. flexible extrusion strip; 14. spiral groove; 15. circular cover plate; 16. mounting ring sleeve; 17. connecting rod; 18. heat exchange groove; 19. conical cylinder; 20. U-shaped tube; 21. heat dissipation fin; 22. connecting piece; 23. rubber gasket; 24. connecting cylinder. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0019] like Figures 1 to 7 As shown, this embodiment proposes a self-cooling polyethylene insulated power cable, including an insulating sheath 1, in which a plurality of insulated conductors 2 are twisted, and one side of the plurality of insulated conductors 2 is moved out from one side of the insulating sheath 1. The insulating sheath 1 is a polyvinyl chloride sheath, which is a commonly used material sheath for polyethylene insulated power cables in the prior art, and the insulated conductor 2 refers to a metal cable with a polyethylene insulation layer extruded on the outside. In addition, according to the actual model of the polyethylene insulated power cable, a filling layer or an armor layer can be added between the insulating sheath 1 and the insulated conductor 2 during the production process.

[0020] The insulating sheath 1 also includes a closed shell, one side of which is provided with a closed shell, and one side of a plurality of insulated conductors 2 all penetrate the closed shell, the closed shell includes an annular groove frame 9, a circular plate body 10 and an arc-shaped sealing plate 12, the annular groove frame 9 is provided on the outer wall of the insulating sheath 1, the circular plate body 10 is connected with a plurality of connecting cylinders 24, and the insulated conductors 2 extend into the corresponding connecting cylinders 24, two mounting groove frames 11 are fixedly connected between the circular plate body 10 and the annular groove frame 9, the supporting cylinder 3 is fixedly connected to the circular plate body 10, and the arc-shaped sealing plate 12 is provided with a plurality of connecting cylinders 24, and the insulated conductors 2 extend into the corresponding connecting cylinders 24, and two mounting groove frames 11 are fixedly connected between the circular plate body 10 and the annular groove frame 9, the supporting cylinder 3 is fixedly connected to the circular plate body 10, and the arc-shaped sealing plate 12 is provided with a plurality of connecting cylinders 24, and the insulating conductors 2 extend into the corresponding ... The number of 2 is set to two, and two arc-shaped sealing plates 12 are arranged between the two mounting slot frames 11. The two arc-shaped sealing plates 12 keep the annular slot frame 9 and the circular plate body 10 closed, and the extended groove 8 is connected to the arc-shaped sealing plate 12. In order to protect the insulated conductor 2 removed from the insulating sleeve, the two arc-shaped sealing plates 12 are installed between the two mounting slot frames 11. A connecting piece 22 is provided on one side of the arc-shaped sealing plate 12 close to the mounting slot frame 11, and the connecting piece 22 is connected to the mounting slot frame 11 using fasteners; The connecting cylinder 24 is made of rubber, and the inner wall of the connecting cylinder 24 is set to a conical tube shape, so that after the insulated conductor 2 passes through the connecting cylinder 24, the inner wall of the connecting cylinder 24 is tightly fitted with the insulated conductor 2 to prevent the insulated conductor 2 from shrinking. A rubber gasket 23 is arranged on the inner arc surface of the annular groove frame 9, and the inner arc surface of the rubber gasket 23 is also set to a conical tube shape. After the rubber gasket 23 is tightly fitted with the outer wall of the insulating sheath 1, the annular groove frame 9 is fixed on the insulating sheath 1.

[0021] The support cylinder 3 is arranged in a closed shell, and a flexible sleeve 4 is provided on the outer wall of the support cylinder 3. One side of multiple insulated conductors 2 are twisted and arranged on the flexible sleeve 4. Multiple flexible extrusion strips 13 are arranged on the inner arc surface of the arc-shaped sealing plate 12, and the flexible extrusion strips 13 are in contact with the insulated conductors 2. A spiral groove 14 is opened on the outer wall of the flexible sleeve 4, and the insulated conductors 2 are located in the corresponding spiral grooves 14. After the multiple insulated conductors 2 are removed from the insulating cylinder, in order to avoid looseness between the multiple insulated conductors 2 and to ensure that the support cylinder 3 can effectively transfer the heat of the insulated conductors 2, the insulated conductors 2 are made to fit with the inner walls of the corresponding spiral grooves 14, and after the arc-shaped sealing plate 12 is subsequently installed, the insulated conductors 2 are squeezed and fixed by the flexible extrusion strips 13.

[0022] The support cylinder 3 and the flexible sleeve 4 are both set to be conical on one side close to the insulating sheath 1, so that multiple insulated conductors 2 can be laid on the surface of the flexible sleeve 4 along the outer wall of the tapered flexible sleeve 4. A circular cover plate 15 is set on the side of the support cylinder 3 away from the insulating sheath 1. The heat exchanger 5 passes through the circular cover plate 15. The circular cover plate 15 keeps the inside of the support cylinder 3 closed. The support cylinder 3 can be filled with heat dissipation fillers. The heat dissipation fillers mainly used are plastic fillers and ceramic fillers. In special circumstances, metal fillers or fiber fillers can be used. All of the above heat dissipation fillers have good heat transfer capabilities. After the heat exchanger 5 is installed inside the support cylinder 3, the heat dissipation filler is fully in contact with the heat exchanger 5, so as to timely absorb and volatilize the heat generated by the multiple insulated conductors 2 during operation.

[0023] A heat exchanger 5 is arranged in the support cylinder 3, and the heat exchanger 5 extends out from the support cylinder 3. The heat exchanger 5 is divided into an evaporation area 6 and a heat exchange area 7. The evaporation area 6 of the heat exchanger 5 is located in the support cylinder 3. A plurality of mounting rings 16 are arranged in the support cylinder 3. The mounting rings 16 are fixedly connected to the side wall of the support cylinder 3 through a connecting rod 17. The evaporation area 6 of the heat exchanger 5 is fixedly connected to the plurality of mounting rings 16. When the heat exchanger 5 needs to be installed, the evaporation area 6 of the heat exchanger 5 can be installed between the plurality of mounting rings 16, and then heat dissipation fillers are added into the support cylinder 3 so that the heat dissipation fillers are in close contact with the evaporation area 6 of the heat exchanger 5. A plurality of heat exchange grooves 18 are provided on the circumference of the evaporation region 6 of the heat exchange element 5. The heat exchange grooves 18 are used to increase the surface area of ​​the evaporation region 6. The heat exchange element 5 is filled with circulating liquid. By providing the heat exchange grooves 18, the contact area between the evaporation region 6 and the heat dissipation filler can be increased. When the heat dissipation filler transfers the heat generated by the insulated conductor 2, the heat is transferred to the heat exchange element 5, so that the circulating liquid in the heat exchange element 5 is heated and evaporated into gas, and the evaporated gas is discharged into the heat exchange region 7 of the heat exchange element 5. Among them, a plurality of inserted grooves 8 are provided on the closed shell, and the heat exchange element 5 is a heat exchange area 7 that extends into the inserted grooves 8. A conical cylinder 19 is fixedly connected in the heat exchange area 7 of the heat exchange element 5, and a plurality of U-shaped tubes 20 are connected between the heat exchange area 7 and the conical cylinder 19. The U-shaped tube 20 extends into the inserted groove 8, and the input end of the U-shaped tube 20 is connected with the conical cylinder 19, and the output end of the U-shaped tube 20 is connected with the heat exchange area 7. After the circulating liquid evaporates from the heat exchange element 5 into gas, the gas flows into the heat exchange area 7, and the evaporated gas enters the conical cylinder 19. Then the evaporated gas gathers in the conical cylinder 19, and then the evaporated gas enters the U-shaped tube 20 located on the upper side. After the evaporated gas enters the U-shaped tube 20, the U-shaped tube 20 contacts the outside air, so that the evaporated gas is quickly condensed into circulating liquid and continues to enter the heat exchange area 7, and flows back to the evaporation area 6, thereby completing the effect of automatic cooling of the plurality of insulated conductors 2. A plurality of heat dissipation fins 21 are fixedly connected between the extended groove 8 and the U-shaped tube 20. By providing the heat dissipation fins 21, the efficiency of heat exchange between the evaporated gas flowing in the U-shaped tube 20 and the external environment can be improved, so that the evaporated gas can be condensed into circulating liquid as soon as possible.

[0024] The working principle of this self-cooling polyethylene insulated power cable: First, one side of the plurality of insulated conductors 2 is removed from the insulating sleeve, and then the insulated conductors 2 are fitted to the inner walls of the corresponding spiral grooves 14, and after the arc-shaped sealing plate 12 is subsequently installed, the insulated conductors 2 are squeezed and fixed by the flexible extrusion strip 13, so that the insulated conductors 2 pass through the connecting cylinder 24 and are electrically connected to the power equipment. In actual use, the entire polyethylene insulated power cable is tilted so that the height of the circular plate 10 is higher than the height of the annular groove frame 9, so that the circulating liquid can flow back to the evaporation area 6 as much as possible; Then, in the subsequent process of using the insulated conductor 2 to transmit current, when the insulated conductor 2 overheats, because the insulated conductor 2 is tightly fitted with the supporting cylinder 3, the heat on the insulated conductor 2 can be transferred to the heat dissipation filler as soon as possible, and then the circulating fluid in the heat exchanger 5 is heated and evaporated into gas, and the evaporated gas will be discharged into the heat exchange area 7 of the heat exchanger 5. After the circulating fluid evaporates into gas from the heat exchanger 5, the gas flows into the heat exchange area 7, and the evaporated gas enters the conical cylinder 19. Then the evaporated gas gathers in the conical cylinder 19, and then the evaporated gas enters the U-shaped tube 20 located on the upper side. After the evaporated gas enters the U-shaped tube 20, the U-shaped tube 20 contacts the outside air, so that the evaporated gas is quickly condensed into circulating liquid and continues to enter the heat exchange area 7, and then flows back to the evaporation area 6, completing the automatic cooling of multiple insulated conductors 2.

[0025] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-cooling polyethylene insulated power cable, comprising an insulating sheath (1), wherein a plurality of insulated conductors (2) are twisted inside the insulating sheath (1), and one side of the plurality of insulated conductors (2) are moved out from one side of the insulating sheath (1), characterized in that: Also includes: A closed shell, wherein one side of the insulating sheath (1) is provided with the closed shell, and one side of each of the plurality of insulating conductors (2) passes through the closed shell; A support cylinder (3), the support cylinder (3) being arranged in the closed shell, the outer wall of the support cylinder (3) being provided with a flexible sleeve (4), one side of a plurality of the insulated conductors (2) being twisted and arranged on the flexible sleeve (4), a heat exchange element (5) being arranged in the support cylinder (3), the heat exchange element (5) extending from the support cylinder (3), the heat exchange element (5) being divided into an evaporation area (6) and a heat exchange area (7), the evaporation area (6) of the heat exchange element (5) being located in the support cylinder (3); The closed shell is provided with a plurality of extending grooves (8), and the heat exchange element (5) has the heat exchange area (7) extending into the extending grooves (8).

2. A self-cooling polyethylene insulated power cable according to claim 1, characterized in that: The closed housing comprises: An annular groove frame (9), the annular groove frame (9) being arranged on the outer wall of the insulating sheath (1); A circular plate body (10), the circular plate body (10) being connected to a plurality of connecting cylinders (24), the insulated conductors (2) extending into corresponding connecting cylinders (24), two mounting slot frames (11) being fixedly connected between the circular plate body (10) and the annular slot frame (9), and the supporting cylinder (3) being fixedly connected to the circular plate body (10); The arc-shaped sealing plate (12) is provided in two numbers, and the two arc-shaped sealing plates (12) are arranged between the two mounting groove frames (11). The two arc-shaped sealing plates (12) keep the annular groove frame (9) and the circular plate body (10) closed, and the inserted groove (8) is connected to the arc-shaped sealing plate (12).

3. A self-cooling polyethylene insulated power cable according to claim 2, characterized in that: A plurality of flexible extrusion strips (13) are provided on the inner arc surface of the arc-shaped sealing plate (12), the flexible extrusion strips (13) are in contact with the insulating conductor (2), a spiral groove (14) is provided on the outer wall of the flexible sleeve (4), and the insulating conductor (2) is located in the corresponding spiral groove (14).

4. A self-cooling polyethylene insulated power cable according to claim 3, characterized in that: The sides of the support cylinder (3) and the flexible sleeve (4) close to the insulating sheath (1) are both configured to be conical, and a circular cover plate (15) is provided on the side of the support cylinder (3) away from the insulating sheath (1), the heat exchange element (5) passes through the circular cover plate (15), and the circular cover plate (15) keeps the interior of the support cylinder (3) closed.

5. A self-cooling polyethylene insulated power cable according to claim 4, characterized in that: The support cylinder (3) may be filled with heat dissipation filler.

6. A self-cooling polyethylene insulated power cable according to claim 5, characterized in that: A plurality of mounting ring sleeves (16) are arranged in the support cylinder (3); the mounting ring sleeves (16) are fixedly connected to the side wall of the support cylinder (3) via a connecting rod (17); and the evaporation region (6) of the heat exchange element (5) is fixedly connected in the plurality of mounting ring sleeves (16).

7. A self-cooling polyethylene insulated power cable according to claim 6, characterized in that: A plurality of heat exchange grooves (18) are provided on the circumference of the evaporation region (6) of the heat exchange element (5), the heat exchange grooves (18) being used to increase the surface area of ​​the evaporation region (6), and the heat exchange element (5) is filled with circulating liquid.

8. A self-cooling polyethylene insulated power cable according to claim 7, characterized in that: A conical cylinder (19) is fixedly connected to the heat exchange region (7) of the heat exchange element (5); a plurality of U-shaped tubes (20) are connected between the heat exchange region (7) and the conical cylinder (19); the U-shaped tubes (20) extend into the insertion groove (8); the input ends of the U-shaped tubes (20) are connected to the conical cylinder (19); and the output ends of the U-shaped tubes (20) are connected to the heat exchange region (7).

9. A self-cooling polyethylene insulated power cable according to claim 8, characterized in that: A plurality of heat dissipation fins (21) are fixedly connected between the extended groove (8) and the U-shaped tube (20).

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