Highly efficient heat dissipating crosslinked polyethylene power cable

Abstract

The application discloses a high-efficiency heat-dissipation crosslinked polyethylene power cable, which comprises a sheath unit and a plurality of cable core bodies, the cable core bodies sequentially comprise a flame-retardant layer, an insulating layer and a conductor from outside to inside, the sheath unit comprises a plurality of wrapping layers and a plurality of connecting units, two adjacent wrapping layers are connected through one connecting unit, and each cable core body is wrapped by one wrapping layer; the plurality of cable core bodies are distributed in one row. The power cable can realize protection of the cable core bodies, has good voltage resistance effect, and thus ensures long-term stable work of the cable core bodies. Moreover, the power cable can realize active air-cooling heat dissipation, thereby improving the heat-dissipation efficiency of the cable, prolonging the service life of the cable and reducing the fault risk caused by overheating. In addition, the power cable can realize internal temperature measurement and can timely find that the cable is damaged due to excessive pressure.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically, to a high-efficiency heat-dissipating cross-linked polyethylene power cable. Background Technology

[0002] Power cables have a wide range of applications, not only in power systems, but also in information transmission systems, mechanical equipment, instrumentation systems, and many other fields. With the development of new energy sources, power cables are also being used more and more extensively in renewable energy fields such as wind power and solar power generation.

[0003] Existing power cables have inadequate protection, making the cable core susceptible to damage from the external environment, such as moisture, corrosion, and mechanical damage, which in turn affects the cable's withstand voltage and long-term stability. When subjected to excessive pressure, the cable may experience performance degradation or failure due to internal structural damage. However, due to a lack of effective monitoring methods, such pressure damage is often difficult to detect in a timely manner, posing a threat to the safe operation of the power system. Some power cables may have inefficient heat dissipation. Under high loads and prolonged operation, heat easily accumulates inside the cable, leading to excessively high core temperatures, which accelerates the aging of insulation materials, reduces cable lifespan, and increases the risk of failure due to overheating. If the cable lacks an effective internal temperature measurement mechanism, its operating temperature cannot be monitored in real time. When overheating occurs, it cannot be detected and addressed promptly, increasing the likelihood of failure. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a high-efficiency heat dissipation cross-linked polyethylene power cable.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a power cable, comprising a sheath unit and multiple core bodies, wherein the core bodies comprise, from the outside to the inside, a flame-retardant layer, an insulation layer and a conductor, the sheath unit comprising multiple wrapping layers and multiple connecting units, two adjacent wrapping layers being connected by a connecting unit, and each core body being wrapped by one of the wrapping layers; the multiple core bodies are arranged in a row.

[0006] Furthermore, the top and bottom of the connecting unit are both concave in an arc-shaped cross-section.

[0007] Furthermore, it also includes two heat-conducting units, two protective shell units, and a protective sleeve layer enclosing the two protective shell units; the heat-conducting unit includes multiple first heat-conducting plates with arc-shaped cross-sections and multiple second heat-conducting plates with arc-shaped cross-sections, adjacent two first heat-conducting plates are connected by the second heat-conducting plates, each wrapping layer is wrapped and abutted by the first heat-conducting plates of the two heat-conducting units, and each connecting unit is abutted by the second heat-conducting plates of the two heat-conducting units; the protective shell unit includes a shell with a U-shaped cross-section, two abutting plates with arc-shaped cross-sections, and multiple support strips with circular cross-sections, the abutting plates are connected to the shell by connecting plates, the abutting plates are used to abut the first heat-conducting plates, and the support strips are connected to the shell by support plates; the two protective shell units are respectively a first protective shell unit and a second protective shell unit, the two connecting plates of the first protective shell unit have embedded grooves, the two connecting plates of the second protective shell unit have embedded protrusions that cooperate with the embedded grooves, and the protective sleeve layer is formed by extruding and wrapping the two protective shell units after the two protective shell units are closed.

[0008] Furthermore, the power cable includes multiple heat dissipation sections, each with an air inlet unit and an air outlet unit installed at both ends. Each air inlet unit and air outlet unit includes two fixedly connected ventilation sections. Each ventilation section includes a U-shaped clamping frame, a ventilation pipe connected to the clamping frame, and multiple insertion tubes connected to the clamping frame and communicating with the ventilation pipe. A sealing ring is fixed to the end of each insertion tube. The upper and lower surfaces at both ends of the heat dissipation section have multiple insertion holes into which the insertion tubes are inserted. The housing has multiple communicating holes communicating with the insertion holes. The insertion tubes are inserted into the insertion holes, and the sealing rings abut against and seal the surface of the housing.

[0009] This allows for a good seal between the sealing ring and the housing.

[0010] Furthermore, multiple heat dissipation sections extend along the length of the cable core body, with the distance between two adjacent heat dissipation sections being less than 20cm.

[0011] Furthermore, each clamp has 6 insertion tubes, the clamp includes two end blocks and a clamping plate connecting the two end blocks, the end blocks have countersunk holes, the two clamps of the air inlet unit are fixedly connected by bolts and nuts, and the two clamps of the air outlet unit are fixedly connected by bolts and nuts.

[0012] Furthermore, each heat dissipation segment has 6 insertion holes on its upper surface and 6 insertion holes on its lower surface, and the diameter of the insertion holes is larger than the diameter of the connecting hole.

[0013] Furthermore, each shell is connected to 5 support plates, which are divided into a first support plate located in the middle and four other second support plates; each shell has 5 support bars, which are divided into a first support bar located in the middle and four other second support bars. The first support plate includes two first buffer plates with arc-shaped cross sections, and the second support plate includes a second buffer plate with an arc-shaped cross section connected to the shell and a third buffer plate with an arc-shaped cross section connecting the second buffer plate and the second support bar; the first support bar has a receiving groove extending along the length of the cable core body, and the receiving groove contains a temperature-sensing optical fiber.

[0014] Therefore, the internal temperature of the cable can be measured through the temperature-measuring optical fiber, and it can also be used to detect whether the cable has been subjected to excessive compression.

[0015] Furthermore, the first buffer plate connects the housing and the first support bar.

[0016] Furthermore, the shell includes a first plate with a straight cross-section and two second plates with straight cross-sections, and a connecting plate with an arc-shaped cross-section connects the second plates and the first plates.

[0017] Furthermore, each connecting plate of the first protective shell unit has two said embedding grooves, which extend along the length direction of the cable core body; each connecting plate of each second protective shell unit has two said embedding protrusions, which extend along the length direction of the cable core body.

[0018] Thus, the two protective shell units can be closed to form a tight and stable connection.

[0019] Furthermore, the conductor is a copper conductor; the insulation layer is a cross-linked polyethylene insulation layer; the flame retardant layer is a low-smoke halogen-free flame retardant layer; and the protective sleeve layer is made of polyethylene.

[0020] Furthermore, the protective shell unit is extruded from PVC material.

[0021] Furthermore, the end of the ventilation pipe has a strip-shaped opening, and the end of the ventilation pipe has a connecting flange.

[0022] Furthermore, a sealing gasket is installed between each ventilation section and the protective sleeve layer. The sealing gasket has multiple through holes into which the tube is inserted, and the clamping plate of the ventilation section has a groove for placing the sealing gasket.

[0023] This allows for a good seal between the gasket and the ventilation section.

[0024] Beneficial effects:

[0025] 1. The power cable of this application can protect the cable core body and has good voltage resistance, thereby ensuring the long-term stable operation of the cable core body.

[0026] 2. The power cable of this application can achieve active air cooling, thereby improving the heat dissipation efficiency of the cable, extending the service life of the cable, and reducing the risk of failure due to overheating.

[0027] 3. The power cable of this application can achieve internal temperature measurement and can detect damage caused by excessive pressure in a timely manner. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the cable.

[0029] Figure 2 This is a magnified view of region A;

[0030] Figure 3 This is a magnified view of region B.

[0031] Figure 4 This is a schematic diagram of the cable cross-section;

[0032] Figure 5 This is a magnified view of region C;

[0033] Figure 6 This is a magnified view of region D;

[0034] Figure 7 This is a schematic diagram showing the separation of the ventilation section;

[0035] Figure 8 This is a magnified view of region E.

[0036] Figure 9 This is a magnified view of region F;

[0037] Figure 10 This is a schematic diagram showing the components of the cable separated.

[0038] Figure 11 This is a magnified view of region G;

[0039] Figure 12 This is a magnified view of region H;

[0040] Figure 13 This is a magnified view of region I;

[0041] Figure 14 This is a magnified view of region J.

[0042] Explanation of reference numerals in the attached drawings: Cable core body 1; Flame retardant layer 1.1; Insulation layer 1.2; Conductor 1.3; Sheath layer 2.1; Connecting unit 2.2; First heat-conducting plate 3.1; Second heat-conducting plate 3.2; Shell 4.1; Connecting hole 4.1.1; Abutting plate 4.2; Support bar 4.3; First support bar 4.3.1; Second support bar 4.3.2; Connecting plate 4.4; Embedded groove 4.5; Embedded protrusion 4.6; First buffer plate 4.7; Second buffer plate 4.8; Third buffer plate 4.9; Protective sleeve layer 5; End block 6.1; Clamping plate 6.2; Groove portion 6.2.1; Ventilation pipe 6.3; Insertion tube 6.4; Sealing ring 6.5; Insertion hole 7; Temperature measuring optical fiber 8; Sealing gasket 9. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0044] The present invention provides a high-efficiency heat dissipation cross-linked polyethylene power cable as shown in the figure, including a sheath unit and multiple cable core bodies 1. The cable core body 1 includes a flame-retardant layer 1.1, an insulation layer 1.2 and a conductor 1.3 from the outside to the inside. The sheath unit includes multiple wrapping layers 2.1 and multiple connecting units 2.2. Two adjacent wrapping layers 2.1 are connected by a connecting unit 2.2. Each cable core body 1 is wrapped by one of the wrapping layers 2.1. The multiple cable core bodies 1 are arranged in a row. The power cable also includes two heat-conducting units, two protective shell units, and a protective sheath 5 enclosing the two protective shell units. Each heat-conducting unit includes multiple first heat-conducting plates 3.1 with arc-shaped cross-sections and multiple second heat-conducting plates 3.2 with arc-shaped cross-sections. Adjacent first heat-conducting plates 3.1 are connected by second heat-conducting plates 3.2. Each sheath 2.1 is wrapped and abutted by the first heat-conducting plates 3.1 of the two heat-conducting units, and each connecting unit 2.2 is abutted by the second heat-conducting plates 3.2 of the two heat-conducting units. The protective shell unit includes a U-shaped shell 4.1, two arc-shaped abutting plates 4.2, and multiple arc-shaped abutting plates 5. A circular support strip 4.3 is provided. A connecting plate 4.4 connects the abutment plate 4.2 and the shell 4.1. The abutment plate 4.2 is used to abut the first heat-conducting plate 3.1. The support strip 4.3 and the shell 4.1 are connected by the support plate. The two protective shell units are the first protective shell unit and the second protective shell unit. The two connecting plates 4.4 of the first protective shell unit have embedded grooves 4.5. The two connecting plates 4.4 of the second protective shell unit have embedded protrusions 4.6 that cooperate with the embedded grooves 4.5. The protective sleeve layer 5 is formed by extruding and wrapping the two protective shell units after the two protective shell units are closed. The power cable includes multiple heat dissipation sections. Each heat dissipation section has an air inlet unit and an air outlet unit installed at both ends. Each air inlet unit and air outlet unit includes two fixedly connected ventilation parts. Each ventilation part includes a U-shaped clamping frame, a ventilation pipe 6.3 connected to the clamping frame, and multiple insertion tubes 6.4 connected to the clamping frame and communicating with the ventilation pipe 6.3. A sealing ring 6.5 is fixed to the end of each insertion tube 6.4. The upper and lower surfaces at both ends of the heat dissipation section have multiple insertion holes 7 into which the insertion tubes 6.4 are inserted. The housing 4.1 has multiple communicating holes 4.1.1 communicating with the insertion holes 7. The insertion tubes 6.4 are inserted into the insertion holes 7, and the sealing rings 6.5 abut against and seal the surface of the housing 4.1.

[0045] Each clamping bracket has six insertion tubes 6.4. The clamping bracket includes two end blocks 6.1 and a clamping plate 6.2 connecting the two end blocks 6.1. The end blocks 6.1 have countersunk holes. The two clamping brackets of the air inlet unit are fixedly connected by bolts and nuts, and the two clamping brackets of the air outlet unit are fixedly connected by bolts and nuts. Each heat dissipation section has six insertion holes 7 on the upper surface and six insertion holes 7 on the lower surface. The diameter of the insertion holes 7 is larger than the diameter of the connecting hole 4.1.1. Each housing 4.1 is connected to five support plates, which are divided into a first support plate located in the middle and four second support plates. Each housing 4.1 also has five support bars 4.3, which are divided into a first support bar 4.3.1 located in the middle and four second support bars 4.3.2. The first support plate includes two first buffer plates 4.7 with arc-shaped cross-sections. The second support plate includes a second buffer plate 4.8 with an arc-shaped cross-section connected to the housing 4.1 and a third buffer plate 4.9 with an arc-shaped cross-section connecting the second buffer plate 4.8 and the second support bar 4.3.2. The first support bar 4.3.1 has a receiving groove extending along the length of the cable core body 1, and the receiving groove contains a temperature-sensing optical fiber 8. The housing 4.1 includes a first plate with a straight cross-section and two second plates with straight cross-sections, and a connecting plate with an arc-shaped cross-section connects the second plates and the first plates. Each connecting plate 4.4 of the first protective shell unit has two embedded grooves 4.5 extending along the length of the cable core body 1; each connecting plate 4.4 of each second protective shell unit has two embedded protrusions 4.6 extending along the length of the cable core body 1. The conductor 1.3 is a copper conductor; the insulation layer 1.2 is a cross-linked polyethylene insulation layer; the flame retardant layer 1.1 is a low-smoke halogen-free flame retardant layer; the protective sleeve layer 5 is made of polyethylene. A sealing gasket 9 is installed between each ventilation section and the protective sleeve layer 5. The sealing gasket 9 has multiple through holes 9.1 into which the insert tube 6.4 is inserted, and the clamping plate 6.2 of the ventilation section has a groove 6.2.1 for placing the sealing gasket 9.

[0046] Working Principle: The power cable of this application comprises multiple cable cores protected by sheath units arranged in a row. These multiple cable cores are actually wrapped by two heat-conducting units and have two protective shell units and a protective sheath. The two protective shell units can be closed together, and a protective sheath is extruded onto the outside. Thus, the protective shell units provide physical protection, and with the help of support bars and plates, the cable cores are protected with better pressure resistance. Furthermore, air-cooled heat dissipation channels are formed between the protective shell units. After the protective sheath is extruded, insertion holes and connecting holes are machined, and ventilation parts are installed, enabling air-cooled heat dissipation within the two protective shell units, thereby achieving better heat dissipation.

[0047] Furthermore, the temperature-sensing optical fiber can measure the temperature of the cable core itself. The support strip housing the temperature-sensing optical fiber has a recessed groove, providing installation space for the fiber. The support strip, with its two first buffer plates, offers enhanced support. If the temperature-sensing optical fiber is damaged (indicating abnormal temperature readings), it means the two first buffer plates have been excessively compressed, indicating that the cable itself has been excessively compressed. Therefore, the temperature-sensing optical fiber can not only measure the temperature within the two protective housing units but also detect whether the cable has been excessively compressed.

[0048] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention without departing from the scope defined by the claims.

Claims

1. A high-efficiency heat-dissipating cross-linked polyethylene power cable, characterized in that, The cable core includes a sheath unit and multiple cable core bodies. The cable core bodies, from the outside to the inside, include a flame-retardant layer, an insulation layer, and a conductor. The sheath unit includes multiple wrapping layers and multiple connecting units. Two adjacent wrapping layers are connected by a connecting unit. Each cable core body is wrapped by one of the wrapping layers. The multiple cable core bodies are arranged in a row. It also includes two heat-conducting units, two protective shell units, and a protective sleeve layer covering the two protective shell units; the heat-conducting unit includes multiple first heat-conducting plates with arc-shaped cross-sections and multiple second heat-conducting plates with arc-shaped cross-sections, adjacent two first heat-conducting plates are connected by the second heat-conducting plates, each sleeve layer is wrapped and abutted by the first heat-conducting plates of the two heat-conducting units, and each connecting unit is abutted by the second heat-conducting plates of the two heat-conducting units; the protective shell unit includes a shell with a U-shaped cross-section, two abutting plates with arc-shaped cross-sections, and multiple support strips with circular cross-sections, the abutting plates are connected to the shell by connecting plates, the abutting plates are used to abut the first heat-conducting plates, and the support strips are connected to the shell by support plates; the two protective shell units are a first protective shell unit and a second protective shell unit, the two connecting plates of the first protective shell unit have embedding grooves, the two connecting plates of the second protective shell unit have embedding protrusions that cooperate with the embedding grooves, and the protective sleeve layer is formed by extruding and wrapping the two protective shell units after the two protective shell units are closed; Each housing is connected to 5 support plates, which are divided into a first support plate located in the middle and four second support plates. Each housing also has 5 support bars, which are divided into a first support bar located in the middle and four second support bars. The first support plate includes two first buffer plates with arc-shaped cross sections. The second support plate includes a second buffer plate with an arc-shaped cross section connected to the housing and a third buffer plate with an arc-shaped cross section connecting the second buffer plate and the second support bar. The first support bar has a receiving groove extending along the length of the cable core body, and the receiving groove contains a temperature-sensing optical fiber.

2. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 1, characterized in that, The power cable includes multiple heat dissipation sections. Each heat dissipation section has an air inlet unit and an air outlet unit installed at both ends. Each air inlet unit and air outlet unit includes two fixedly connected ventilation parts. Each ventilation part includes a U-shaped clamping frame, a ventilation pipe connected to the clamping frame, and multiple insertion tubes connected to the clamping frame and communicating with the ventilation pipe. A sealing ring is fixed to the end of each insertion tube. The upper and lower surfaces at both ends of the heat dissipation section have multiple insertion holes into which the insertion tubes are inserted. The housing has multiple communicating holes communicating with the insertion holes. The insertion tubes are inserted into the insertion holes, and the sealing rings abut against the surface of the housing for sealing.

3. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 2, characterized in that, Each clamp has 6 tubes. The clamp includes two end blocks and a clamping plate connecting the two end blocks. The end blocks have countersunk holes. The two clamps of the air inlet unit are fixedly connected by bolts and nuts. The two clamps of the air outlet unit are fixedly connected by bolts and nuts.

4. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 2, characterized in that, Each heat dissipation section has 6 holes on its upper surface and 6 holes on its lower surface, and the diameter of the holes is larger than the diameter of the connecting holes.

5. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 2, characterized in that, The shell includes a first plate with a straight cross-section and two second plates with straight cross-sections, and a connecting plate with an arc-shaped cross-section connects the second plates and the first plate.

6. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 2, characterized in that, Each connecting plate of the first protective shell unit has two said embedding grooves, which extend along the length direction of the cable core body; each connecting plate of each second protective shell unit has two said embedding protrusions, which extend along the length direction of the cable core body.

7. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 2, characterized in that, The conductor is a copper conductor; the insulation layer is a cross-linked polyethylene insulation layer; the flame retardant layer is a low-smoke halogen-free flame retardant layer; and the protective sleeve is made of polyethylene.

8. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 2, characterized in that, A sealing gasket is installed between each ventilation section and the protective sleeve. The sealing gasket has multiple through holes into which the tube is inserted, and the clamping plate of the ventilation section has a groove for placing the sealing gasket.

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