435 / 750kV crosslinked polyethylene insulation welding corrugated aluminum sheath polymer sheath power cable and processing technology

Abstract

The invention discloses a 435 / 750kV cross-linked polyethylene insulation welding corrugated aluminum sheath polymer sheath power cable and a processing technology, and relates to the technical field of power cables, the 435 / 750kV cross-linked polyethylene insulation welding corrugated aluminum sheath polymer sheath power cable comprises a conductor, an insulation layer I, a heat conduction layer, a heat conduction gas channel, a valve plate and a support ring, the first insulating layers are arranged on the outer sides of the conductors in a sleeving mode, the two heat conduction layers are symmetrically arranged on the outer sides of the first insulating layers, heat conduction gas channels are formed in the inner sides of the two first insulating layers, and the valve plates are fixed to the outer sides of the first insulating layers in a hot pressing mode. Local heat generated by the conductor can be effectively transmitted to other positions of the cable, argon can extrude the valve plate after being heated and expanded to enable argon flow to flow to other positions of the cable, then heat transmission is achieved, and the problem that heat generated by excessively stacked cables cannot be dissipated in time in the occasion that the cables are excessively stacked can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, in particular to a 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable and a processing technology thereof. Background Art

[0002] Power cables are transmission facilities used to transmit electrical energy. In places where cables are entangled and piled up too much, the heat generated by the cables cannot be dissipated in time, which can easily cause local cable overheating, thereby damaging the cables and shortening the cable life.

[0003] The defects of existing power cables are: 1. The prior art EP3221868A1 discloses a power cable, which does not have the function of transferring local heat of the cable to the gas area of the cable for heat dissipation through heat-conducting gas. When the power cables are bent and stacked together, the heat generated by the cables cannot be dissipated in time, which can easily damage the cables. Therefore, there is a need for a 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable that can transfer local heat of the cable to other parts of the cable for heat dissipation through heat-conducting gas to solve this problem.

[0004] 2. The prior art US5006670A discloses a power cable, which does not have the function of transferring local heat of the cable to other parts of the cable through heat-conducting gas. When heat-conducting gas is provided, the heat-conducting gas freely circulates inside the cable and easily escapes, causing the loss of heat-conducting gas. Therefore, a 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable is needed to solve this problem. The 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable can transfer local heat of the cable to other parts through heat-conducting gas and avoid the loss of heat-conducting gas.

[0005] 3. The prior art KR1020140041031A discloses a power cable. When a heat-conducting gas is arranged inside the cable, if a valve for controlling the flow of the gas is provided, the valve is easily compressed when the cable is squeezed, causing the valve to be unable to open under the gas pressure, thereby preventing the gas from flowing inside the cable, and thus failing to achieve the flow of gas to transfer local heat to other places. Therefore, a 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable is needed to solve this problem. The cable can prevent the valve for controlling the flow of gas inside the cable from being squeezed and losing its switching ability.

[0006] 4. The prior art CN112041943B discloses a power cable. When heat-conducting gas is arranged inside the cable, if a silicone valve is provided to control the gas flow, the valve is prone to aging when heated. Therefore, a 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable is needed to solve this problem by improving the aging resistance of the valve that controls the flow of heat-conducting gas. Summary of the Invention

[0007] One purpose of the present application is to provide a 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable and a processing technology, which can solve the technical problems raised in the prior art.

[0008] To achieve the above object, the present invention provides the following technical solution: 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheath polymer sheath power cable, the 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheath polymer sheath power cable comprises, from inside to outside, a conductor, an insulating layer 1, a heat-conducting layer, a heat-conducting gas channel, a valve plate, a support ring, an insulating layer 2, an aluminum alloy sheath and a protective sheath, the insulating layer is set on the outside of the conductor, the two heat-conducting layers are symmetrically arranged on the outside of the insulating layer 1, and the two insulating layers are symmetrically arranged on the outside of the insulating layer 1. A heat-conducting air channel is formed on the inner side of the insulating layer 1, and the multiple valve plates are fixed to the outer side of the insulating layer 1 by hot pressing, and the valve plates are located on the inner side of the heat-conducting air channel, and the outer side of the valve plates is coated with high-temperature resistant paint, and the multiple support rings are fixed to the outer side of the insulating layer 1 by hot pressing, and the support rings are located on the inner side of the heat-conducting air channel. At the same time, two of the support rings are respectively located in front and behind the valve plates, the insulating layer 2 is sleeved on the outer side of the heat-conducting layer, the aluminum alloy sheath is sleeved on the outer side of the insulating layer 2, and the protective sheath is sleeved on the outer side of the aluminum alloy sheath.

[0009] Preferably, the materials of the first and second insulating layers are cross-linked polyethylene.

[0010] Preferably, the heat-conducting layer material is heat-conducting silicone rubber.

[0011] Preferably, the aluminum alloy sheath is a corrugated aluminum alloy sheath.

[0012] Preferably, the protective cover is made of polyvinyl chloride or polyethylene.

[0013] Preferably, the valve plate is made of silicone and the high-temperature resistant coating on the outside of the valve plate is porcelain coating.

[0014] Preferably, the distance between two adjacent valve plates is 1 to 2 meters.

[0015] Preferably, the gas in the heat-conducting gas channel is argon or helium.

[0016] Preferably, the processing technology of the 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable comprises the following steps: S1. Use a screw extruder to extrude the material onto the outside of the conductor to form an insulating layer. S2. Using a screw extruder, the material is extruded outside the insulating layer to form a symmetrical heat-conducting layer, and a heat-conducting gas channel is formed between the two heat-conducting layers; S3, gluing multiple valve plates with porcelain coating on their outer surfaces to the outer side of the first insulating layer at equal intervals using PA-based hot melt adhesive, with the valve plates located on the inner sides of the two heat-conducting gas channels; S4, using a screw extruder to extrude the material onto the outside of the heat conductive layer to form a second insulating layer; S5. The aluminum alloy sheath is directly put on the outside of the second insulating layer, and then the material is extruded on the outside of the aluminum alloy sheath by a screw extruder to form a protective sheath, and then the heat conducting gas is filled into the heat conducting gas channel.

[0017] Preferably, the step S3 further includes the following steps: S31. Glue multiple support rings to the outside of the insulating layer 1 using PA-based hot melt adhesive, and the support rings are located on the inside of the heat-conducting gas channel. Two adjacent support rings are located in front of and behind the valve plate, respectively.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention can effectively transfer the local heat generated by the conductor to other positions of the cable by arranging a heat-conducting layer and a heat-conducting gas channel on the outside of the insulating layer and storing heat-conducting gas such as argon in the heat-conducting gas channel. After the argon expands due to heat, it can squeeze the valve plate to make the argon flow to other positions of the cable, thereby realizing heat transfer, avoiding the problem of slow heat transfer speed caused by only transferring heat through solids, and reducing the problem of heat generated by the excessively accumulated cables not being able to be dissipated in time in places where there are too many cables.

[0019] The present invention can prevent the heat-conducting gas such as argon in the heat-conducting gas channel from flowing freely and leaking out by disposing the valve plate.

[0020] The present invention can prevent the valve plate from being squeezed by the cable due to external squeezing, thereby preventing the valve plate from being pushed by the argon gas inside the heat-conducting gas channel, by arranging support rings at close distances in front of and behind the valve plate, thereby preventing the heat-conducting gas inside the heat-conducting gas channel from being unable to pass through the valve plate.

[0021] The invention can reduce the aging speed of the valve plate when it is heated by coating the outer surface of the valve plate with a high-temperature resistant ceramic coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the heat-conducting layer and heat-conducting gas channel structure of the present invention; Figure 3 This is a schematic structural diagram of location A of the present invention; Figure 4 It is a process flow chart of the present invention.

[0023] In the figure: 1. Conductor; 2. Insulation layer 1; 3. Heat-conducting layer; 4. Heat-conducting gas channel; 5. Insulation layer 2; 6. Aluminum alloy sheath; 7. Protective cover; 8. Valve plate; 9. Support ring. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4, 435 / 750kV cross-linked polyethylene insulation welded corrugated aluminum sheath polymer sheath power cable, 435 / 750kV cross-linked polyethylene insulation welded corrugated aluminum sheath polymer sheath power cable includes conductor 1, insulation layer 1 2, heat conductive layer 3, heat conductive gas channel 4, valve plate 8, support ring 9, insulation layer 2 5, aluminum alloy sheath 6 and protective sheath 7 from inside to outside, insulation layer 1 2 is sheathed on the outside of conductor 1, two heat conductive layers 3 are symmetrically arranged on the outside of insulation layer 1 2, and the inner side of the two insulation layers 1 2 forms a conductive gas channel. Hot air channel 4, multiple valve plates 8 are fixed on the outside of insulation layer 2 by hot pressing, and valve plate 8 is located on the inside of heat-conducting air channel 4, and the outside of valve plate 8 is coated with high-temperature resistant paint, multiple support rings 9 are fixed on the outside of insulation layer 2 by hot pressing, and support ring 9 is located on the inside of heat-conducting air channel 4. At the same time, two support rings 9 are respectively located in front and behind valve plate 8, insulation layer 2 5 is sleeved on the outside of heat-conducting layer 3, aluminum alloy sheath 6 is sleeved on the outside of insulation layer 2 5, and protective cover 7 is sleeved on the outside of aluminum alloy sheath 6.

[0028] The materials of the insulating layer 1 2 and the insulating layer 2 5 are cross-linked polyethylene.

[0029] The heat conducting layer 3 is made of heat conducting silicone rubber.

[0030] The aluminum alloy sheath 6 is a corrugated aluminum alloy sheath.

[0031] The material of the protective cover 7 is polyvinyl chloride or polyethylene.

[0032] The material of the valve plate 8 is silica gel, and the high temperature resistant coating on the outer side of the valve plate 8 is porcelain coating.

[0033] The distance between two adjacent valve plates 8 is 1 to 2 meters.

[0034] The gas in the heat-conducting gas channel 4 is argon or helium.

[0035] The processing technology of 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable includes the following steps: S1, using a screw extruder to extrude the material onto the outside of the conductor 1 to form an insulating layer 2; S2. Use a screw extruder to extrude the material onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; S3, gluing multiple valve plates 8 with porcelain coating on their outer surfaces to the outside of the insulating layer 1 2 at equal intervals using PA-based hot melt adhesive, with the valve plates 8 located on the inner sides of the two heat-conducting gas channels 4; S4, using a screw extruder to extrude the material onto the outside of the heat-conducting layer 3 to form an insulating layer 5; S5. The aluminum alloy sheath 6 is directly put on the outside of the second insulating layer 5, and then the material is extruded on the outside of the aluminum alloy sheath 6 by a screw extruder to form a protective sheath 7, and then the heat conducting gas is filled into the heat conducting gas channel 4.

[0036] S3 also includes the following steps: S31. Glue multiple support rings 9 to the outside of the insulating layer 2 using PA-based hot melt adhesive, and the support rings 9 are located inside the heat-conducting gas channel 4. At the same time, two adjacent support rings 9 are located in front of and behind the valve plate 8 respectively.

[0037] Example 1: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Glue multiple valve discs 8 made of silicone material with porcelain coating on their outer surfaces to the outside of the insulating layer 1 2 at equal intervals using PA-based hot melt adhesive, with the valve disc 8 located inside the two heat-conducting gas channels 4. Glue multiple support rings 9 to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the support rings 9 located inside the heat-conducting gas channels 4, with two adjacent support rings 9 located in front and behind the valve disc 8, respectively. 4. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the heat conductive layer 3 to form an insulating layer 5; 5. The corrugated aluminum alloy sheath 6 is directly sheathed on the outside of the insulating layer 2 5 , and then the molten polyvinyl chloride is extruded on the outside of the aluminum alloy sheath 6 by a screw extruder to form a protective sheath 7 , and then the heat conducting gas argon is filled into the heat conducting gas channel 4 .

[0038] Example 2: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the heat conductive layer 3 to form the second insulating layer 5; 4. The corrugated aluminum alloy sleeve aluminum alloy sheath 6 is directly sleeved on the outside of the insulating layer 2 5, and then the molten polyvinyl chloride is extruded on the outside of the aluminum alloy sheath 6 by a screw extruder to form a protective sleeve 7, and then the heat conducting gas argon is filled into the heat conducting gas channel 4.

[0039] Example 3: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Glue multiple valve discs 8 made of silicone material with porcelain coating on the outer surface to the outside of the insulating layer 1 2 at equal intervals using PA-based hot melt adhesive, and the valve discs 8 are located on the inner sides of the two heat-conducting gas channels 4; 4. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the heat conductive layer 3 to form an insulating layer 5; 5. The corrugated aluminum alloy sheath 6 is directly sheathed on the outside of the insulating layer 2 5 , and then the molten polyvinyl chloride is extruded on the outside of the aluminum alloy sheath 6 by a screw extruder to form a protective sheath 7 , and then the heat conducting gas argon is filled into the heat conducting gas channel 4 .

[0040] Example 4: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Glue multiple valve discs 8 made of silicone material with porcelain coating on their outer surfaces to the outside of the insulating layer 1 2 at equal intervals using PA-based hot melt adhesive, with the valve disc 8 located inside the two heat-conducting gas channels 4. Glue multiple support rings 9 to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the support rings 9 located inside the heat-conducting gas channels 4, with two adjacent support rings 9 located in front and behind the valve disc 8, respectively. 4. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the heat conductive layer 3 to form an insulating layer 5; 5. The corrugated aluminum alloy sleeve is directly sleeved on the outside of the insulating layer 2 5 , and then the molten polyvinyl chloride is extruded on the outside of the aluminum alloy sleeve 6 by a screw extruder to form a protective sleeve 7 .

[0041] Embodiment 5: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Glue multiple silicone valve discs 8 at equal intervals to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the valve disc 8 located inside the two heat-conducting gas channels 4. Glue multiple support rings 9 to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the support rings 9 located inside the heat-conducting gas channels 4, and with two adjacent support rings 9 located in front and behind the valve disc 8, respectively. 4. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the heat conductive layer 3 to form an insulating layer 5; 5. The corrugated aluminum alloy sheath 6 is directly sheathed on the outside of the insulating layer 2 5 , and then the molten polyvinyl chloride is extruded on the outside of the aluminum alloy sheath 6 by a screw extruder to form a protective sheath 7 , and then the heat conducting gas argon is filled into the heat conducting gas channel 4 .

[0042] Example 6: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Glue multiple silicone valve discs 8 at equal intervals to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the valve disc 8 located inside the two heat-conducting gas channels 4. Glue multiple support rings 9 to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the support rings 9 located inside the heat-conducting gas channels 4, and with two adjacent support rings 9 located in front and behind the valve disc 8, respectively. 4. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the heat conductive layer 3 to form an insulating layer 5; 5. The corrugated aluminum alloy sleeve is directly sleeved on the outside of the insulating layer 2 5 , and then the molten polyvinyl chloride is extruded on the outside of the aluminum alloy sleeve 6 by a screw extruder to form a protective sleeve 7 .

[0043] Embodiment seven: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Glue multiple valve discs 8 made of silicone material with porcelain coating on their outer surfaces to the outside of the insulating layer 1 2 at equal intervals using PA-based hot melt adhesive, with the valve disc 8 located inside the two heat-conducting gas channels 4. Glue multiple support rings 9 to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the support rings 9 located inside the heat-conducting gas channels 4, with two adjacent support rings 9 located in front and behind the valve disc 8, respectively. 4. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the heat conductive layer 3 to form an insulating layer 5; 5. Use a screw extruder to extrude molten polyvinyl chloride onto the outer side of the second insulating layer 5 to form a protective cover 7 , and then fill the heat-conducting gas argon into the heat-conducting gas channel 4 .

[0044] Embodiment 8: 1. Using a screw extruder, molten cross-linked polyethylene is extruded onto the outside of the conductor 1 to form an insulating layer 2; 2. Using a screw extruder, molten heat-conducting silicone rubber is extruded onto the outer side of the insulating layer 1 2 to form a symmetrical heat-conducting layer 3, and a heat-conducting gas channel 4 is formed between the two heat-conducting layers 3; 3. Glue multiple valve discs 8 made of silicone material with porcelain coating on their outer surfaces to the outside of the insulating layer 1 2 at equal intervals using PA-based hot melt adhesive, with the valve disc 8 located inside the two heat-conducting gas channels 4. Glue multiple support rings 9 to the outside of the insulating layer 1 2 using PA-based hot melt adhesive, with the support rings 9 located inside the heat-conducting gas channels 4, with two adjacent support rings 9 located in front and behind the valve disc 8, respectively. Fourth, a screw extruder is used to extrude molten cross-linked polyethylene onto the outside of the heat conductive layer 3 to form the second insulating layer 5.

[0045] Performance testing: Heat dissipation performance test: 4-meter-long products of each embodiment were selected. Then, heating rods of the same power were inserted into the heat-conducting air channel 4 at one end of the product for heating. Then, a thermometer was used to continuously detect temperature changes in the heat-conducting air channel 4 at the other end of the product, and the temperature value of the thermometer was recorded after 2 minutes.

[0046] Test data of each embodiment under the same test conditions It can be seen from the experimental data that by arranging a heat-conducting layer 3 and a heat-conducting gas channel 4 on the outside of the insulating layer 1 and storing heat-conducting gases such as argon in the heat-conducting gas channel 4, the local heat generated by the conductor 1 can be effectively transferred to other positions of the cable. After the argon expands due to heat, it can squeeze the valve plate 8 so that the argon gas flows to other positions of the cable, thereby realizing heat transfer, avoiding the problem of slow heat transfer caused by only transferring heat through solids. In the case of excessive accumulation of cables, the problem of the heat generated by the excessive accumulation of cables cannot be dissipated in time can be reduced. In addition, the provision of the valve plate 8 can prevent the heat-conducting gas such as argon in the heat-conducting gas channel 4 from flowing freely and leaking out. The provision of support rings 9 at close distances in front and behind the valve plate 8 can prevent the valve plate 8 from being squeezed by the external squeezing of the cable, resulting in the valve plate 8 being unable to be pushed by the argon gas in the heat-conducting gas channel 4, thereby avoiding the heat-conducting gas in the heat-conducting gas channel 4 from being unable to pass through the valve plate 8. At the same time, coating the outer surface of the valve plate 8 with high-temperature resistant ceramic coating can reduce the aging rate of the valve plate 8 due to heat.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the rights involved.

Claims

1. 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable, characterized by: The 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable comprises, from the inside to the outside, a conductor (1), an insulating layer 1 (2), a heat-conducting layer (3), a heat-conducting gas channel (4), a valve plate (8), a support ring (9), an insulating layer 2 (5), an aluminum alloy sheath (6) and a protective sheath (7), wherein the insulating layer 1 (2) is sheathed on the outside of the conductor (1), the two heat-conducting layers (3) are symmetrically arranged on the outside of the insulating layer 1 (2), and the inner sides of the two insulating layers 1 (2) form a heat-conducting gas channel (4), and the multiple valve plates (8) are formed by hot pressing. The valve plate (8) is fixed on the outside of the insulating layer (2), and the valve plate (8) is located on the inside of the heat-conducting gas channel (4), and the outside of the valve plate (8) is coated with a high-temperature resistant coating. The plurality of support rings (9) are fixed on the outside of the insulating layer (2) by hot pressing, and the support ring (9) is located on the inside of the heat-conducting gas channel (4). At the same time, two of the support rings (9) are respectively located in front of and behind the valve plate (8). The insulating layer (5) is sleeved on the outside of the heat-conducting layer (3), the aluminum alloy sheath (6) is sleeved on the outside of the insulating layer (5), and the protective sleeve (7) is sleeved on the outside of the aluminum alloy sheath (6).

2. The 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that: The materials of the insulating layer 1 (2) and the insulating layer 2 (5) are cross-linked polyethylene.

3. The 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that: The material of the heat-conducting layer (3) is heat-conducting silicone rubber.

4. The 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that: The aluminum alloy sheath (6) is a corrugated aluminum alloy sheath.

5. The 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that: The material of the protective cover (7) is polyvinyl chloride or polyethylene.

6. The 435 / 750 kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to any one of claims 1 to 5, characterized in that: The material of the valve plate (8) is silica gel, and the high-temperature resistant coating on the outer side of the valve plate (8) is porcelain coating.

7. The 435 / 750 kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that: The distance between two adjacent valve plates (8) is 1 to 2 meters.

8. The 435 / 750 kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that: The gas in the heat-conducting gas channel (4) is argon or helium.

9. The processing technology of the 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that: The processing technology of the 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable comprises the following steps: S1, using a screw extruder to extrude the material onto the outside of the conductor (1) to form an insulating layer (2); S2, using a screw extruder to extrude the material onto the outer side of the insulating layer 1 (2) to form a symmetrical heat-conducting layer (3), and forming a heat-conducting gas channel (4) between the two heat-conducting layers (3); S3, gluing multiple valve plates (8) with porcelain coating on their outer surfaces to the outer side of the insulating layer 1 (2) at equal intervals using PA-based hot melt adhesive, and the valve plates (8) are located on the inner sides of the two heat-conducting gas channels (4); S4, using a screw extruder to extrude the material onto the outside of the heat-conducting layer (3) to form a second insulating layer (5); S5. The aluminum alloy sheath (6) is directly placed on the outside of the second insulating layer (5), and then the material is extruded on the outside of the aluminum alloy sheath (6) by a screw extruder to form a protective sheath (7), and then the heat-conducting gas is filled into the heat-conducting gas channel (4).

10. The processing technology of the 435 / 750kV cross-linked polyethylene insulated welded corrugated aluminum sheathed polymer sheathed power cable according to claim 9, characterized in that: The S3 also includes the following steps: S31. Glue a plurality of support rings (9) to the outside of the insulating layer 1 (2) using a PA-based hot melt adhesive, with the support rings (9) being located inside the heat-conducting gas channel (4) and two adjacent support rings (9) being located in front of and behind the valve plate (8), respectively.

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