High-efficiency heat-dissipation crosslinked polyethylene power cable

Abstract

The invention discloses an efficient heat dissipation crosslinked polyethylene power cable which comprises a protective layer unit and a plurality of cable core bodies, each cable core body sequentially comprises a flame retardant layer, an insulating layer and a conductor from outside to inside, the protective layer unit comprises a plurality of wrapping layers and a plurality of connecting units, and every two adjacent wrapping layers are connected through one connecting unit. Each cable core body is wrapped by a wrapping layer; the plurality of cable core bodies are distributed in a row. According to the power cable, the cable core body can be protected, and the voltage withstanding effect is good, so that long-term stable work of the cable core body is ensured. And active air cooling heat dissipation can be realized, so that the heat dissipation efficiency of the cable is improved, the service life of the cable is prolonged, and the fault risk caused by overheating is reduced. And internal temperature measurement can be realized, and damage caused by excessive compression of the cable can be found in time.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more specifically, to a highly heat-dissipating cross-linked polyethylene power cable. Background Art

[0002] Power cables are widely used in various fields, not only limited to the power system, but also involving multiple fields such as information transmission systems, mechanical equipment, and instrumentation systems. With the development of new energy, power cables are also increasingly widely used in renewable energy fields such as wind power and solar power generation.

[0003] Existing power cables have deficiencies in protection, resulting in the cable core being vulnerable to damage from the external environment, such as moisture, corrosion, and mechanical damage, which in turn affects the voltage withstand performance and long-term stability of the cable. When the cable is subjected to excessive compression, its internal structure may be damaged, leading to a decline in performance or a malfunction. However, due to the lack of effective monitoring means, this kind of compression damage is often difficult to detect in a timely manner, posing a hidden danger to the safe operation of the power system. Some power cables may have problems with low heat dissipation efficiency. Under high load and long-term operation conditions, heat is likely to accumulate inside the cable, causing the temperature of the cable core to be too high, which in turn accelerates the aging of the insulating material, reduces the service life of the cable, and increases the risk of failures caused by overheating. If the cable lacks an effective internal temperature measurement mechanism and cannot monitor the operating temperature of the cable in real time, when the cable overheats, it cannot be detected and measures cannot be taken in a timely manner, thus increasing the likelihood of failures. Summary of the Invention

[0004] The present invention aims to overcome the defects of the prior art and provides a highly heat-dissipating cross-linked polyethylene power cable.

[0005] To achieve the above object, the present invention provides the following technical solution: A power cable includes a sheath unit and a plurality of cable core bodies. Each cable core body sequentially includes a flame-retardant layer, an insulating layer, and a conductor from the outside to the inside. The sheath unit includes a plurality of wrapping layers and a plurality of connecting units. Two adjacent wrapping layers are connected by one connecting unit, and each cable core body is wrapped by one of the wrapping layers; the plurality of cable core bodies are arranged in a row.

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

[0007] Further, it further includes two heat conduction units, two protective housing units, and a protective sleeve layer that wraps the two protective housing units; each heat conduction unit includes a plurality of first heat conduction plates with an arc-shaped cross-section and a plurality of second heat conduction plates with an arc-shaped cross-section. Adjacent two first heat conduction plates are connected by a second heat conduction plate. Each wrapping layer is wrapped and abutted by the first heat conduction plates of the two heat conduction units, and each connecting unit is abutted by the second heat conduction plates of the two heat conduction units; each protective housing unit includes a housing with a U-shaped cross-section, two abutting plates with an arc-shaped cross-section, and a plurality of support bars with a circular cross-section. A connecting plate is connected between the abutting plate and the housing. The abutting plate is used to abut the first heat conduction plate, and the support bar and the housing are connected by a support plate; the two protective housing units are respectively a first protective housing unit and a second protective housing unit. Embedding grooves are provided at the two connecting plates of the first protective housing unit, and embedding protrusions that cooperate with the embedding grooves are provided at the two connecting plates of the second protective housing unit. The protective sleeve layer is extruded and wrapped around the two protective housing units after they are closed to form a shape.

[0008] Further, the power cable includes a plurality of heat dissipation sections. An air inlet unit and an air outlet unit are respectively installed at both ends of each heat dissipation section. Both the air inlet unit and the air outlet unit include two fixedly connected ventilation parts. Each ventilation part includes a U-shaped clamping frame, a ventilation pipe connected to the clamping frame, and a plurality of insertion pipes connected to the clamping frame and communicating with the ventilation pipe. A sealing ring is fixed at the end of the insertion pipe; A plurality of insertion holes into which the insertion pipes are inserted are provided on both the upper surface and the lower surface at both ends of the heat dissipation section. A plurality of communication holes communicating with the insertion holes are provided on the housing. The insertion pipe is inserted into the insertion hole, and the sealing ring abuts and seals against the surface of the housing.

[0009] Thus, good sealing can be achieved between the sealing ring and the housing.

[0010] Further, a plurality of heat dissipation sections extend along the length direction of the cable core body, and the distance between adjacent two heat dissipation sections is less than 20 cm.

[0011] Further, each clamping frame has 6 insertion pipes. The clamping frame includes two end blocks and a clamping plate connecting the two end blocks. A counterbore is provided at the end block. The two clamping frames of the air inlet unit are fixedly connected by bolts and nuts, and the two clamping frames of the air outlet unit are fixedly connected by bolts and nuts.

[0012] Further, each heat dissipation section has 6 insertion holes on both the upper surface and the lower surface at both ends, and the diameter of the insertion hole is larger than the diameter of the communication hole.

[0013] Further, each housing is connected to five support plates. The five support plates are divided into a first support plate located in the middle position and the remaining four second support plates. Each housing corresponds to five support bars, which are divided into a first support bar located in the middle position and the remaining four second support bars. The first support plate includes two first buffer plate bodies with an arc-shaped cross-section. The second support plate includes a second buffer plate body with an arc-shaped cross-section connected to the housing and a third buffer plate body with an arc-shaped cross-section connecting the second buffer plate body and the second support bar. An accommodation groove extending along the length direction of the cable core body is provided at the first support bar, and a temperature-measuring optical fiber is accommodated in the accommodation groove.

[0014] Thus, the internal temperature measurement of the cable can be realized through the temperature-measuring optical fiber, and the detection of whether the cable has been excessively squeezed can also be realized.

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

[0016] Further, the housing includes a first plate body with a straight cross-section and two second plate bodies with straight cross-sections. A connecting plate body with an arc-shaped cross-section is connected between the second plate body and the first plate body.

[0017] Further, each connecting plate of the first protective housing unit has two of the embedding grooves, which extend along the length direction of the cable core body. Each connecting plate of each second protective housing unit has two of the embedding protrusions, which extend along the length direction of the cable core body.

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

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

[0020] Further, the protective housing unit is formed by extrusion molding of PVC material.

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

[0022] Further, a sealing gasket is installed between each ventilation part and the protective sheath layer. The sealing gasket has a plurality of through-hole parts into which the insertion pipes are inserted, and a groove part for placing the sealing gasket is provided at the clamping plate of the ventilation part.

[0023] Thus, good sealing can be achieved between the sealing gasket and the ventilation part.

[0024] Beneficial effects: 1. The power cable of the present application can protect the cable core body, has good voltage withstand effect, and thus ensures the long-term stable operation of the cable core body.

[0025] 2. The power cable of the present application can achieve active air-cooled heat dissipation, thereby improving the heat dissipation efficiency of the cable, extending the service life of the cable, and reducing the failure risk caused by overheating.

[0026] 3. The power cable of the present application can achieve internal temperature measurement and can detect in time when the cable is damaged due to excessive pressure. Description of the Drawings

[0027] Figure 1 is a schematic diagram of the cable; Figure 2 is an enlarged view of area A; Figure 3 is an enlarged view of area B; Figure 4 is a schematic cross-sectional view of the cable; Figure 5 is an enlarged view of area C; Figure 6 is an enlarged view of area D; Figure 7 is a separation schematic diagram of the ventilation part; Figure 8 is an enlarged view of area E; Figure 9 is an enlarged view of area F; Figure 10 is a separation schematic diagram of each component of the cable; Figure 11 is an enlarged view of area G; Figure 12 is an enlarged view of area H; Figure 13 is an enlarged view of area I; Figure 14 is an enlarged view of area J.

[0028] Description of the reference numerals: cable core body 1; flame retardant layer 1.1; insulating layer 1.2; conductor 1.3; wrapping layer 2.1; connecting unit 2.2; first heat conducting plate 3.1; second heat conducting plate 3.2; housing 4.1; communication 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; embedding groove 4.5; embedding protrusion 4.6; first buffer plate body 4.7; second buffer plate body 4.8; third buffer plate body 4.9; protective sleeve layer 5; end block 6.1; clamping plate 6.2; groove part 6.2.1; ventilation pipe 6.3; insertion pipe 6.4; sealing ring 6.5; insertion hole 7; temperature measuring optical fiber 8; sealing gasket 9. Detailed Description of the Invention

[0029] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where 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 drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] The present invention provides an efficient heat-dissipating cross-linked polyethylene power cable as shown in the figure, which includes a sheath unit and a plurality of cable core bodies 1. The cable core body 1 sequentially includes a flame-retardant layer 1.1, an insulating layer 1.2, and a conductor 1.3 from the outside to the inside. The sheath unit includes a plurality of wrapping layers 2.1 and a plurality of connecting units 2.2. Two adjacent wrapping layers 2.1 are connected by one connecting unit 2.2, and each cable core body 1 is wrapped by one of the wrapping layers 2.1; the plurality of cable core bodies 1 are arranged in a row. The power cable further includes two heat-conducting units, two protective shell units, and a protective sleeve layer 5 that wraps the two protective shell units; the heat-conducting unit includes a plurality of first heat-conducting plates 3.1 with an arc-shaped cross-section and a plurality of second heat-conducting plates 3.2 with an arc-shaped cross-section. Two adjacent first heat-conducting plates 3.1 are connected by a second heat-conducting plate 3.2. Each wrapping layer 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 housing 4.1 with a U-shaped cross-section, two abutting plates 4.2 with an arc-shaped cross-section, and a plurality of support bars 4.3 with a circular cross-section. A connecting plate 4.4 is connected between the abutting plate 4.2 and the housing 4.1. The abutting plate 4.2 is used to abut the first heat-conducting plate 3.1, and the support bar 4.3 and the housing 4.1 are connected by a support plate; the two protective shell units are respectively a first protective shell unit and a second protective shell unit. The two connecting plates 4.4 of the first protective shell unit have an embedding groove 4.5, and the two connecting plates 4.4 of the second protective shell unit have an embedding protrusion 4.6 that cooperates with the embedding groove 4.5. The protective sleeve layer 5 is extruded and wrapped around the two protective shell units after they are closed to form a shape. The power cable includes a plurality of heat-dissipating sections, and an air inlet unit and an air outlet unit are respectively installed at both ends of each heat-dissipating section. The air inlet unit and the air outlet unit each include two fixedly connected ventilation parts. The ventilation part includes a U-shaped clamping frame, a ventilation pipe 6.3 connected to the clamping frame, and a plurality of insertion pipes 6.4 connected to the clamping frame and communicating with the ventilation pipe 6.3. A sealing ring 6.5 is fixed at the end of the insertion pipe 6.4; a plurality of insertion holes 7 into which the insertion pipe 6.4 is inserted are provided on the upper and lower surfaces at both ends of the heat-dissipating section. A plurality of communication holes 4.1.1 communicating with the insertion holes 7 are provided on the housing 4.1. The insertion pipe 6.4 is inserted into the insertion hole 7, and the sealing ring 6.5 abuts and seals against the surface of the housing 4.1.

[0031] There are 6 insertion tubes 6.4 at each clamping frame. The clamping frame includes two end blocks 6.1 and a clamping plate 6.2 connecting the two end blocks 6.1. There are counterbores at the end blocks 6.1. The two clamping frames of the air inlet unit are fixedly connected by bolts and nuts, and the two clamping frames of the air outlet unit are fixedly connected by bolts and nuts. There are 6 jacks 7 on the upper surface at both ends of each heat dissipation section, and 6 jacks 7 on the lower surface. The diameter of the jack 7 is larger than the diameter of the communication hole 4.1.1. Each housing 4.1 is connected with 5 support plates. The 5 support plates are divided into a first support plate located in the middle position and the remaining four second support plates; there are 5 support bars 4.3 corresponding to each housing 4.1. The 5 support bars 4.3 are divided into a first support bar 4.3.1 located in the middle position and the remaining four second support bars 4.3.2. The first support plate includes two first buffer plate bodies 4.7 with an arc-shaped cross section. The second support plate includes a second buffer plate body 4.8 with an arc-shaped cross section connected to the housing 4.1 and a third buffer plate body 4.9 with an arc-shaped cross section connecting the second buffer plate body 4.8 and the second support bar 4.3.2; there is a receiving groove extending along the length direction of the cable core body 1 at the first support bar 4.3.1, and a temperature measuring optical fiber 8 is received in the receiving groove. The housing 4.1 includes a first plate body with a straight cross section and two second plate bodies with a straight cross section. A connecting plate body with an arc-shaped cross section is connected between the second plate body and the first plate body. Each connecting plate 4.4 of the first protective shell unit has two of the embedding grooves 4.5, and the embedding grooves 4.5 extend along the length direction of the cable core body 1; each connecting plate 4.4 of each second protective shell unit has two of the embedding protrusions 4.6, and the embedding protrusions 4.6 extend along the length direction of the cable core body 1. The conductor 1.3 is a copper conductor; the insulating layer 1.2 is a cross-linked polyethylene insulating layer; the flame retardant layer 1.1 is a low-smoke and halogen-free flame retardant layer; the protective sheath layer 5 is made of polyethylene. A sealing gasket 9 is installed between each ventilation part and the protective sheath layer 5. The sealing gasket 9 has a plurality of through-hole parts 9.1 into which the insertion tubes 6.4 are inserted, and there is a groove part 6.2.1 for placing the sealing gasket 9 at the clamping plate 6.2 of the ventilation part.

[0032] Working principle: For the power cable of the present application, its multiple cable core bodies are protected by the sheath unit and are distributed in a row. And the multiple cable core bodies are actually abutted and wrapped by two heat conduction units, and there are two protective shell units and a protective sheath layer. The two protective shell units can be closed together, and a protective sheath layer is extrusion molded outside, so that the protective shell units not only form physical protection, and with the help of the support bars and support plates, the cable core bodies are protected and have a better voltage resistance effect, and an air-cooled heat dissipation channel is formed between the protective shell units. After the protective sheath layer is extrusion molded, the jacks and communication holes are processed, and after the ventilation parts are installed, the air-cooled heat dissipation for the two protective shell units can be realized, so as to achieve a better heat dissipation effect.

[0033] Moreover, the temperature-measuring optical fiber can measure the temperature at the location of the cable core body. The support bar where the temperature-measuring optical fiber is located has a receiving groove, thereby providing an installation space for the temperature-measuring optical fiber. And the support bar with the installation temperature-measuring space has two first buffer plates, thus having a stronger support effect. If the temperature-measuring optical fiber is damaged (indicating abnormal temperature measurement), it means that the two first buffer plates are overly squeezed, which means that the cable body is overly squeezed. Therefore, the temperature-measuring optical fiber can not only measure the temperature in the two protective shell units, but also detect whether the cable is overly squeezed.

[0034] Although the present invention has been illustrated and described with respect to the preferred embodiments, those skilled in the art should understand that various changes and modifications can be made to the present invention as long as they do not exceed the scope defined by the claims of the present invention.

Claims

1. An efficient heat-dissipating cross-linked polyethylene power cable, characterized in that, It includes a sheath unit and multiple cable core bodies. The cable core bodies sequentially include a flame-retardant layer, an insulating layer, and a conductor from outside to inside. The sheath unit includes multiple wrapping layers and multiple connecting units. Two adjacent wrapping layers are connected by one connecting unit, and each cable core body is wrapped by one of the wrapping layers; the multiple cable core bodies are arranged in a row.

2. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 1, wherein It further includes two heat-conducting units, two protective shell units, and a protective sleeve layer that wraps the two protective shell units; the heat-conducting unit includes multiple first heat-conducting plates with an arc-shaped cross-section and multiple second heat-conducting plates with an arc-shaped cross-section. Two adjacent first heat-conducting plates are connected by a second heat-conducting plate. 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 U-shaped housing, two abutting plates with an arc-shaped cross-section, and multiple support bars with a circular cross-section. A connecting plate is connected between the abutting plate and the housing. The abutting plate is used to abut the first heat-conducting plate, and the support bar and the housing are connected by a support plate; the two protective shell units are respectively a first protective shell unit and a second protective shell unit. Embedding grooves are provided at the two connecting plates of the first protective shell unit, and embedding protrusions that cooperate with the embedding grooves are provided at the two connecting plates of the second protective shell unit. The protective sleeve layer is extrusion-molded to wrap the two protective shell units after the two protective shell units are closed.

3. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 2, wherein The power cable includes multiple heat-dissipating sections. An air inlet unit and an air outlet unit are respectively installed at both ends of each heat-dissipating section. The air inlet unit and the air outlet unit both include two fixedly connected ventilation parts. The ventilation part includes a U-shaped clamping frame, a ventilation pipe connected to the clamping frame, and multiple insertion pipes connected to the clamping frame and communicating with the ventilation pipe. A sealing ring is fixed at the end of the insertion pipe; multiple insertion holes into which the insertion pipes are inserted are provided on the upper surface and the lower surface at both ends of the heat-dissipating section. Multiple communication holes communicating with the insertion holes are provided on the housing. The insertion pipe is inserted into the insertion hole, and the sealing ring abuts and seals against the surface of the housing.

4. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 3, characterized in that, Six insertion pipes are provided at each clamping frame. The clamping frame includes two end blocks and a clamping plate connecting the two end blocks. Counterbores are provided at the end blocks. The two clamping frames of the air inlet unit are fixedly connected by bolts and nuts, and the two clamping frames of the air outlet unit are fixedly connected by bolts and nuts.

5. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 3, wherein Six insertion holes are provided on the upper surface at both ends of each heat-dissipating section, and six insertion holes are provided on the lower surface. The diameter of the insertion hole is larger than the diameter of the communication hole.

6. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 3, wherein, Each housing is connected with five support plates, and the five support plates are divided into a first support plate located at the middle position and the remaining four second support plates; each housing corresponds to five support bars, and the five support bars are divided into a first support bar located at the middle position and the remaining four second support bars. The first support plate includes two first buffer plate bodies with an arc-shaped cross section, and the second support plate includes a second buffer plate body with an arc-shaped cross section connected to the housing and a third buffer plate body with an arc-shaped cross section connecting the second buffer plate body and the second support bar; a receiving groove extending along the length direction of the cable core body is provided at the first support bar, and a temperature-measuring optical fiber is received in the receiving groove.

7. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 3, wherein The housing includes a first plate body with a straight cross section and two second plate bodies with a straight cross section, and a connecting plate body with an arc-shaped cross section is connected between the second plate body and the first plate body.

8. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 3, characterized in that, Each connecting plate of the first protective housing unit has two of the embedding grooves, and the embedding grooves extend along the length direction of the cable core body; each connecting plate of each second protective housing unit has two of the embedding protrusions, and the embedding protrusions extend along the length direction of the cable core body.

9. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 3, wherein The conductor is a copper conductor; the insulating layer is a cross-linked polyethylene insulating layer; the flame-retardant layer is a low-smoke and halogen-free flame-retardant layer; the protective sheath layer is made of polyethylene.

10. The high-efficiency heat-dissipating cross-linked polyethylene power cable according to claim 3, characterized in that, A sealing gasket is installed between each ventilation part and the protective sheath layer. The sealing gasket has a plurality of through-hole parts inserted by the insertion pipes, and a groove part for placing the sealing gasket is provided at the clamping plate of the ventilation part.

Images