Crosslinked polyethylene insulated power cable

Abstract

The invention relates to a crosslinked polyethylene insulated power cable, which comprises a plurality of wire cores wound together, each wire core comprises a wire and an insulation shielding layer wrapping the periphery of the wire, the periphery of the wire core is provided with an inner sheath, a waterproof filling layer is arranged between the inner sheath and the wire core, and the waterproof filling layer is arranged between the inner sheath and the wire core. The periphery of the inner sheath is wrapped with a steel tape armoring layer, the periphery of the steel tape armoring layer is wrapped with an outer sheath, the top of the outer sheath is provided with an installation plane, the installation plane is detachably provided with a fixed keel, the periphery of the outer sheath is sleeved with a plurality of annular supporting keels, and the annular supporting keels are detachably installed on the installation plane. The supporting keel and the fixing keel are detachably connected together. The application has the advantage of improving the use stability of the cable.

Description

Technical Field

[0001] This application relates to the field of cable design, and in particular, to a cross-linked polyethylene insulated power cable. Background Art

[0002] Cross-linked polyethylene insulated power cable (XLPE Insulated Power Cable) is a high-performance cable widely used in power transmission and distribution. Its insulating layer uses cross-linked polyethylene (XLPE) material, which has excellent electrical properties, heat resistance and mechanical strength, and is suitable for medium and high voltage power transmission systems. Currently, during the laying process of cross-linked polyethylene insulated power cables, when the cables are buried underground, the soil above the cables will exert a downward pressure on the cables. After the cables have endured the pressure from the overlying soil for a long time, the top of the cables will tend to flatten downward, and the side walls of the cables will crack and deform, affecting the normal use of the cables. Summary of the Invention

[0003] In order to improve the problem that after the current cables are buried underground, the soil above the cables will exert a downward pressure on the cables. After the cables have endured the pressure from the overlying soil for a long time, the top of the cables will tend to flatten downward, and the side walls of the cables will crack and deform, affecting the normal use of the cables. This application provides a cross-linked polyethylene insulated power cable, which includes a plurality of cores wound together. The core includes a conductor and an insulating shielding layer wrapped around the periphery of the conductor. An inner sheath is provided outside the core. A waterproof filling layer is arranged between the inner sheath and the core. The inner sheath is wrapped with a steel tape armor layer. The steel tape armor layer is wrapped with an outer sheath. The top of the outer sheath is provided with an installation plane, and a fixing keel is detachably installed on the installation plane. A plurality of annular support keels are sleeved outside the outer sheath, and the support keels are detachably connected to the fixing keel.

[0004] By adopting the above solution, with the cooperation of the fixing keel and the support keel, when the cable is placed on the ground or buried underground, the support keel can support the cable to prevent the cable from deforming under its own gravity or external pressure. When facing uneven potholed ground, the fixing keel can support the cable, and as much as possible avoid that when there are potholes at the bottom of the cable and the cable is directly buried without timely filling and leveling, after the cable is subjected to the pressure from above, the cable above the edge of the pothole will be subjected to a large longitudinal shear force and bend and break, affecting the normal use of the cable.

[0005] Further, the installation plane is provided with an installation groove along the length direction of the cable, the fixing keel comprises a supporting portion and a connecting portion which are integrally arranged up and down, the connecting portion extends into the installation groove, a plurality of fixing holes are provided on the connecting portion, and the plurality of fixing holes correspond one to one with the plurality of supporting keels; The outer sheath is provided with a plurality of through holes, and the plurality of through holes are connected to the plurality of fixing holes in a one-to-one correspondence; The supporting keel comprises two symmetrically arranged arc-shaped supporting members, and a plug-in member adapted to the through hole and the fixing hole is integrally arranged on the top of the supporting member, and the plug-in member passes through the through hole and extends into the fixing hole.

[0006] By adopting the above technical solution, the connector passes through the insertion hole and extends into the fixing hole, realizing the detachable connection between the fixing keel, the outer sheath and the supporting keel, which is simple to operate and easy to install. Furthermore, a plurality of annular grooves are provided on the outer peripheral surface of the outer sheath, and the plurality of annular grooves correspond to the plurality of supporting keels one by one, the through hole is provided to the top of the annular groove, and the supporting keel is located in the annular groove.

[0007] By adopting the above solution, the annular groove can limit the support keel, making the support keel more stable.

[0008] Furthermore, the depth of the annular groove is less than the thickness of the supporting keel.

[0009] By adopting the above solution, when the worker drags the cable to move, the supporting keel can support the cable, avoid the cable from dragging on the ground as much as possible, and reduce the wear and tear on the cable.

[0010] Furthermore, an end surface of the connector away from the support member is provided with an arrangement groove, the arrangement groove extends to the upper surface of the connector, a fixing column is vertically fixed in the arrangement groove, the cross section of the fixing column is semicircular, the connectors on the two support keels are inserted into the fixing holes to form a cylindrical clamping column, and a thread is provided on the outer peripheral surface of the clamping column; The upper wall of the corresponding fixing hole is provided with a circular clamping hole, a clamping piece with a circular cross section is slidably connected in the clamping hole, a screw hole adapted to the clamping column is provided at the bottom end of the clamping piece, and the clamping column is threadedly connected in the screw hole.

[0011] By adopting the above solution, the connecting part of the fixed keel is installed in the installation groove of the installation plane, and a plurality of fixing holes on the fixed keel are aligned with the through holes in a plurality of annular grooves on the outer sheath. Then, a plurality of support keels are sequentially installed in the annular grooves of the outer sheath. During the installation of the support keel, the two support members of the support keel are respectively installed in the annular groove from both sides of the outer sheath in a splicing manner, and the plug-in members on the support members pass through the through holes and extend into the fixing holes to abut against each other. Then, the clamping member passes through the clamping hole and is sleeved on the clamping column, and the clamping member is screwed until the two support members are fixed. In this way, the detachable connection among the support keel, the outer sheath and the fixed keel is realized through a clamping member, and the installation is very convenient, greatly saving the construction period and construction cost.

[0012] Further, an arc-shaped guard plate is installed on the periphery of the support keel.

[0013] By adopting the above solution, the guard plates on both sides of the outer sheath can protect the cable and prevent external insects, mice, etc. from gnawing and damaging the outer sheath.

[0014] Further, the connecting groove is a groove opened along the radian of the support member, and the groove is opened to the end of the connecting groove away from the plug-in member; A notch is vertically provided on the fixed column, and a sliding groove is horizontally opened on the inner wall of the notch; A communication hole communicating with the connecting groove is opened on the inner wall of the arrangement groove; The driving assembly includes an adjusting member slidably connected to the notch. A slider is fixedly connected to the adjusting member, and the slider is slidably connected to the sliding groove. A guiding inclined surface is arranged on one side of the adjusting member, and the guiding inclined surface extends out of the notch; The driving assembly further includes an elastic member arranged in the groove. One end of the elastic member is connected to the connecting member, and the other end of the elastic member is connected to the support member. Under the action of the elastic member, the connecting member is located in the groove; A connecting line is arranged between the connecting member and the adjusting member, and the connecting line passes through the communication hole.

[0015] By adopting the above scheme, during the cable arrangement process, the connection part of the fixed keel is installed in the installation groove of the installation plane, and the several fixing holes on the fixed keel are aligned with the perforations in the several annular grooves on the outer sheath, and then the several supporting keels are installed in the annular groove of the outer sheath in sequence. During the installation of the supporting keel, the two supporting members of the supporting keel are respectively installed in the annular groove from both sides of the outer sheath in a splicing manner, and the plug-in member on the supporting member is inserted into the fixing hole through the perforation and abutted together, and then the clamping member is inserted through the clamping hole to the clamping column and then the clamping member is screwed until the two supporting members are fixed, and then the connecting protrusions of the two guard plates are respectively installed in the connecting grooves on the two left and right symmetrical guard plates, and then the clamping member is continued to be screwed, and the clamping member pushes the adjusting member to move into the notch during the downward movement, and in this process, the adjusting member pulls one end of the connecting member through the connecting line to move into the connecting hole on the connecting protrusion, thereby fixing the guard plate. The operation is simple and convenient.

[0016] Furthermore, an observation window communicating with the groove is provided on the outer peripheral surface of the support member, a hook is fixedly connected to the elastic member, a hanging ring is provided in the groove, and the hook is hooked to the hanging ring; A slideway is vertically provided on the upper wall of the slide groove, and the slideway extends to the upper surface of the fixing column. The outer peripheral surface of the support member and the upper surface of the connector are both provided with through openings connected to the connecting hole for the connection line to pass through.

[0017] By adopting the above solution, the part of the cable that does not need to be installed with the guard plate does not need to be installed with the adjustment piece, the connecting wire, the connecting piece and the elastic piece. For the part of the cable that needs to be installed with the guard plate, the staff can slide the adjustment piece from the top of the fixed column to the bottom of the notch, then pass the connecting wire through the through hole, install the connecting piece and the elastic piece into the groove, and then hook the hook on the elastic piece into the hanging ring through the observation window.

[0018] Furthermore, the connecting line includes a main body and a mounting portion which are integrally arranged, the main body is connected to the connecting member, the mounting portion is connected to the adjusting member, and the diameter of the through hole is larger than the mounting portion but smaller than the main body.

[0019] By adopting the above scheme, during the process of installing the connecting mechanism, the installation part is passed through the through-hole, and then the connecting part is installed in the groove. The main body will be located below the through-hole, and the installation part will be misaligned with the through-hole. Since the diameter of the main body is larger than the through-hole, the connecting line can be prevented from detaching from the through-hole as much as possible at this time, making the connecting line more stable.

[0020] In summary, the present invention has at least the following beneficial effects: 1. By providing a fixed keel and a support keel on the cable, through the cooperation of the fixed keel and the support keel, when the cable is placed on the ground or buried underground, the support keel can support the cable to prevent the cable from deforming under its own gravity or external pressure. When facing an uneven potholed ground, the fixed keel can support the cable, and as much as possible avoid that when there are potholes at the bottom of the cable and the cable is directly buried without timely filling and leveling, after the cable is subjected to the pressure from above, a certain position on the cable is subjected to a large shear force and breaks; 2. By providing a protective plate around the cable, the protective plates on both sides of the cable can protect the cable to prevent external insects, mice, etc. from gnawing and damaging the cable; 3. By providing a connection mechanism between the protective plate and the support member, during the cable layout process, the connection part of the fixed keel is installed in the installation groove of the installation plane, and a plurality of fixing holes on the fixed keel are aligned with the through holes in a plurality of annular grooves on the outer sheath. Then, a plurality of support keels are sequentially installed in the annular grooves of the outer sheath. During the installation of the support keel, the two support members of the support keel are respectively installed in the annular groove in a splicing manner from both sides of the outer sheath, and the plug-in members on the support members pass through the through holes and extend into the fixing holes to abut against each other. Then, the clamping member passes through the clamping hole and is sleeved on the clamping column, and the clamping member is screwed until the two support members are fixed. Then, the connection protrusions of the two protective plates are respectively installed in the connection grooves on the two symmetrically arranged protective plates on the left and right. Then, the clamping member is continuously screwed. During the downward movement of the clamping member, the clamping member pushes the adjusting member to move into the notch. During this process, the adjusting member pulls one end of the connecting member to move into the connecting hole on the connection protrusion through the connecting line, thereby realizing the fixation of the protective plate. The operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram showing the internal structure of the cable in this embodiment; Figure 2 It is a schematic diagram showing the overall structure of the cable in this embodiment; Figure 3 It is a cross-sectional view showing the layout structure of the fixed keel on the outer sheath in this embodiment; Figure 4 It is Figure 3 A partial enlarged schematic diagram of part A in Figure 5 It is a schematic diagram showing the connection structure between the support keel and the protective plate in this embodiment; Figure 6 It is a schematic diagram showing the connection mechanism in this embodiment; Figure 7 It is Figure 5 A partial enlarged schematic diagram of part B in Figure 8 It is a schematic diagram showing the connection structure between the guard plate and the support member in this embodiment; Figure 9 is Figure 8 a partial enlarged schematic diagram of part C in Figure 10 It is a schematic diagram showing the structure of the adjusting member in this embodiment; Figure 11 It is a schematic diagram showing the structure of the adjusting member in this embodiment.

[0022] Explanation of reference numerals: 1. Core; 11. Conducting wire; 12. Insulating shield layer; 2. Inner sheath; 21. Waterproof filling layer; 3. Steel tape armor layer; 4. Outer sheath; 41. Installation plane; 411. Installation groove; 42. Annular groove; 43. Perforation; 5. Fixed keel; 51. Support part; 52. Connection part; 521. Fixed hole; 53. Clamping hole; 54. Clamping part; 541. Screw hole; 6. Support keel; 61. Support member; 611. Insertion part; 6111. Arrangement groove; 612. Connection groove; 613. Groove; 6131. Hanging ring; 614. Communication hole; 615. Observation window; 616. Through hole; 7. Clamping post; 71. Fixed post; 711. Notch; 7111. Slide groove; 7112. Slideway; 8. Guard plate; 9. Connection mechanism; 90. Connection protrusion; 901. Connection hole; 902. Opening; 91. Connecting part; 92. Elastic part; 921. Hook; 93. Adjusting member; 931. Slide block; 932. Guide inclined plane; 94. Connecting wire. Detailed implementation manners

[0023] A cross-linked polyethylene insulated power cable provided by the application embodiment, referring to Figure 1 , includes a plurality of cores 1 wound together. The core 1 includes a conducting wire 11 and an insulating shield layer 12 wrapped around the periphery of the conducting wire 11. An inner sheath 2 is sleeved outside the core 1. A waterproof filling layer 21 is arranged between the inner sheath 2 and the core 1. The outer periphery of the inner sheath 2 is wrapped with a steel tape armor layer 3, and the outer periphery of the steel tape armor layer 3 is wrapped with an outer sheath 4.

[0024] Referring to Figure 1 and Figure 2 , the top of the outer sheath 4 is provided with an installation plane 41. A fixed keel 5 is detachably installed on the installation plane 41. The upper surface of the fixed keel 5 is an arc surface. The fixed keel 5 and the cable are spliced together to form a cylinder. Further, a plurality of annular support keels 6 adapted to the cable are sleeved outside the outer sheath 4. A plurality of annular grooves 42 adapted to the support keel are formed on the outer peripheral surface of the outer sheath 4. The plurality of annular grooves 42 correspond to the plurality of support keels 6 one by one. The support keel 6 is detachably connected to the fixed keel 5.

[0025] With the cooperation of the fixed keel 5 and the support keel 6, after the cable is placed on the ground or buried underground, the support keel 6 can support the cable to prevent the cable from deforming under its own gravity or external pressure. When facing uneven potholed ground, the fixed keel 5 can support the cable, and as much as possible avoid that when there are potholes at the bottom of the cable and the soil burial treatment is directly carried out without timely filling and leveling, after the cable is subjected to the pressure from above, the cable above the edge of the pothole is subjected to a large longitudinal shear force and bends and breaks, affecting the normal use of the cable.

[0026] Specifically, an installation groove 411 is provided on the installation plane 41. The installation groove 411 is arranged along the length direction of the cable. The corresponding fixed keel 5 includes a support part 51 and a connection part 52 which are integrally arranged up and down. The upper surface of the support part 51 is an arc surface. The connection part 52 is adapted to the installation groove 411. The connection part 52 extends into the installation groove 411, and the connection part 52 is in a sliding connection with the cable.

[0027] Refer to Figure 3 and Figure 4 , a number of fixing holes 521 are uniformly opened on the connection part 52 in its own length direction. The number of fixing holes 521 is uniformly arranged along the length direction of the connection part 52, and the number of fixing holes 521 corresponds to the number of support keels 6 one by one. A perforation 43 is opened between the two ends at the top of the annular groove 42. The perforation 43 is aligned and communicated with the fixing hole 521.

[0028] Refer to Figure 5 , the support keel 6 is formed by splicing two symmetrically arranged arc-shaped support members 61. An insertion member 611 adapted to the perforation 43 and the fixing hole 521 is integrally arranged at the top of the support member 61. The insertion member 611 passes through the perforation 43 and extends into the fixing hole 521, so as to realize the detachable connection among the fixed keel 5, the cable and the support keel 6.

[0029] Furthermore, the thickness of the support member 61 is greater than the depth of the annular groove 42. After the support keel 6 is arranged on the cable, the support keel 6 extends out of the annular groove 42. When the staff drags the cable to move, the support keel 6 can effectively support the outer sheath 4 of the cable, and as much as possible avoid the outer sheath 4 of the cable from dragging on the ground, reducing the wear of the outer sheath 4 of the cable.

[0030] Refer to Figure 6 and Figure 7, in order to make the connection between the supporting keel 6, the outer sheath 4 and the fixing keel 5 more stable, an arrangement groove 6111 is formed at the end surface of the end of the plug-in member 611 away from the supporting member 61. The arrangement groove 6111 extends to the upper surface of the plug-in member 611. A fixing column 71 is vertically fixed to the lower wall in the arrangement groove 6111. The cross-section of the fixing column 71 is semi-circular. The plug-in members 611 on two symmetrically arranged supporting members 61 are abutted against each other. At this time, the fixing columns 71 on the two supporting members 61 are spliced together to form a cylindrical clamping column 7. A thread is provided on the outer peripheral surface of the clamping column 7.

[0031] A circular clamping hole 53 is formed in the upper wall of the fixing hole 521. A cylindrical clamping member 54 is slidably connected in the clamping hole 53. A screw hole 541 adapted to the clamping column 7 is formed at the bottom end of the clamping member 54. The clamping column 7 extends into the screw hole 541, and a threaded connection is formed between the clamping column 7 and the clamping member 54. In order to facilitate the screwing of the clamping column 7, a plum blossom groove is formed on the upper end surface of the clamping column 7, which is convenient for the staff to use tools for screwing.

[0032] The connecting portion 52 of the fixing keel 5 is installed in the installation groove 411 of the installation plane 41, and a plurality of fixing holes 521 on the fixing keel 5 are aligned with the through holes 43 in a plurality of annular grooves 42 on the outer sheath 4. Then, a plurality of supporting keels 6 are sequentially installed in the annular grooves 42 of the outer sheath 4. During the installation of the supporting keel 6, the two supporting members 61 of the supporting keel 6 are respectively installed in the annular groove 42 in a splicing manner from both sides of the cable, and the plug-in members 611 on the supporting members 61 pass through the through holes 43 and extend into the fixing holes 521 and are abutted against each other. Then, the clamping member 54 is passed through the clamping hole 53 and sleeved on the clamping column 7, and the clamping member 54 is screwed until the two supporting members 61 are fixed. In this way, the detachable connection among the supporting keel 6, the outer sheath 4 and the fixing keel 5 is realized through one clamping member 54, and the installation is very convenient, greatly saving the construction period and construction cost.

[0033] Furthermore, an arc-shaped guard plate 8 is arranged on the periphery of the supporting keel 6, and the radian of the guard plate 8 is adapted to the outer sheath 4. The guard plates 8 on both sides of the outer sheath 4 can protect the outer sheath 4 and prevent external insects and mice from gnawing and damaging the outer sheath 4.

[0034] Refer to Figure 8 , a connection mechanism 9 is arranged between the guard plate 8 and the supporting member 61. The guard plate 8 is detachably connected to the supporting member 61 through the connection mechanism 9. In this way, during the process of laying the cable, the staff can choose whether to install the guard plate 8 in consideration of the on-site environment to achieve the purpose of cost reduction and efficiency improvement.

[0035] Specifically, a connection groove 612 adapted to the radian of the support member 61 is provided on the outer peripheral surface of the support member 61 of the support keel 6, and a groove 613 is provided on the inner wall of the connection groove 612.

[0036] The connection mechanism 9 includes a connection protrusion 90 adapted to the connection groove 612, and the connection protrusion 90 is inserted into the connection groove 612.

[0037] Refer to Figure 8 and Figure 9 As shown in FIGS. and, a connection hole 901 is provided on the connection protrusion 90, and the connection hole 901 is aligned with the groove 613. The connection mechanism 9 further includes a connection member 91 slidably connected in the groove 613, and a driving assembly for driving the connection member 91 to reciprocate in the groove 613. After the connection protrusion on the guard plate 8 is inserted into the connection groove 612, one end of the connection member 91 is extended into the connection hole 901 through the driving assembly to fix the guard plate 8.

[0038] In order to facilitate the laying of the cable, the groove 613 is opened on the end surface of the connection groove 612 far from the plug-in member 611, and the radian of the groove 613 is adapted to the radian of the support member 61.

[0039] Refer to Figure 7 As shown in FIG., a notch 711 is vertically provided on the fixing column 71. And a communication hole 614 communicating with the groove 613 is provided on the inner wall of the layout groove 6111.

[0040] Refer to Figure 11 As shown in FIG., the driving assembly includes an elastic member 92 installed in the groove 613. One end of the elastic member 92 is connected to the support member 61, and the other end of the elastic member 92 is connected to the connection member 91. Under the action of the elastic member 92, the connection member 91 is located in the groove 613.

[0041] The driving assembly further includes an adjusting member 93 slidably connected to the notch 711.

[0042] Refer to Figure 6 As shown in FIG., one side of the adjusting member 93 extends out of the notch 711, and a guiding inclined surface 932 is provided on the side of the adjusting member 93 extending out of the notch 711. A sliding groove 7111 is horizontally provided on the inner wall of the notch 711, and a sliding block 931 adapted to the sliding groove 7111 is fixedly connected to the adjusting member 93. The sliding block 931 is slidably connected to the sliding groove 7111.

[0043] A connection line 94 is fixedly connected between the adjusting member 93 and the connection member 91. The connection line 94 can be made of materials such as steel wire. The connection line 94 passes through the communication hole 614 and the connection groove 612. A through hole 902 for the connection line 94 to pass through is provided on the inner peripheral surface of the corresponding connection protrusion 90. The through hole 902 communicates with the connection hole.

[0044] During the cable layout process, the connecting portion 52 of the fixing keel 5 is installed into the installation groove 411 of the installation plane 41, and a number of fixing holes 521 on the fixing keel 5 are aligned with the through holes 43 in a number of annular grooves 42 on the cable. Then, a number of supporting keels 6 are successively installed into the annular groove 42 of the outer sheath 4. During the installation of the supporting keel 6, the two supporting members 61 of the supporting keel 6 are respectively installed into the annular groove 42 from both sides of the outer sheath 4 in a splicing manner, and the plug-in members 611 on the supporting members 61 pass through the through holes 43 and extend into the fixing holes 521 to abut against each other. Then, the clamping member 54 is passed through the clamping hole 53 and sleeved on the clamping post 7, and the clamping member 54 is screwed until the two supporting members 61 are fixed. Then, the connecting protrusions 90 of the two guard plates 8 are respectively installed into the connecting grooves 612 on the two symmetrically arranged guard plates 8. Then, the clamping member 54 is continuously screwed. During the downward movement of the clamping member 54, the pushing adjusting member 93 is pushed into the notch 711. During this process, the adjusting member 93 pulls one end of the connecting member 91 to move into the connecting hole 901 on the connecting protrusion 90 through the connecting line 94, thereby realizing the fixation of the guard plate 8. The operation is simple and convenient.

[0045] Referring to Figure 8 and Figure 10 As shown, an observation window 615 communicating with the groove 613 is formed on the outer peripheral surface of the support member 61, and the diameter of the observation window 615 is smaller than that of the groove 613. A hanging ring 6131 is arranged in the groove 613. Correspondingly, one end of the elastic member 92 away from the connecting member 91 is fixedly connected with a hook 921, and the hook 921 is hooked into the hanging ring 6131 in the groove 613. A slideway 7112 is vertically formed at the upper wall of the chute 7111 in the notch 711, and the slideway 7112 extends to the upper surface of the fixed column 71.

[0046] Referring to Figure 5 As shown, through holes 616 communicating with the communication holes 614 are formed on the outer peripheral surface of the support member 61 and the upper surface of the plug-in member 611. In this way, the detachable installation of the adjusting member 93, the connecting line 94, the connecting member 91 and the elastic member 92 is realized. For the part of the cable where the guard plate 8 does not need to be installed, the adjusting member 93, the connecting line 94, the connecting member 91 and the elastic member 92 do not need to be installed. For the part of the cable where the guard plate 8 needs to be installed, the staff can slide the adjusting member 93 downward from the top of the fixed column 71 to the bottom of the notch 711, then pass the connecting line 94 through the through hole 616, then install the connecting member 91 and the elastic member 92 into the groove 613, and then hook the hook 921 on the elastic member 92 into the hanging ring 6131 through the observation window 615.

[0047] Further, the connecting line 94 includes a main body portion and a mounting portion which are integrally provided. One end of the main body portion is connected to the mounting portion, and the other end of the main body portion is fixedly connected to the adjusting member 93. One end of the mounting portion is connected to the main body portion, and the other end of the mounting portion is fixedly connected to the connecting member 91. The diameter of the through-hole 616 is larger than that of the mounting portion and smaller than that of the main body portion. In this way, during the installation process of the connection mechanism 9, the mounting portion is passed through the through-hole 616, and then the connecting member 91 is installed into the groove 613. At this time, the main body portion will be located below the through-hole 616, and the mounting portion will be misaligned with the through-hole 616. Since the diameter of the main body portion is larger than that of the through-hole 616, it is possible to avoid the connecting line 94 disengaging from the through-hole 43 as much as possible at this time, making the connecting line 94 more stable.

[0048] The implementation principle of this case is as follows: During the cable layout process, the connecting portion 52 of the fixing keel 5 is installed into the installation groove 411 of the installation plane 41, and several fixing holes 521 on the fixing keel 5 are aligned with the through-holes 43 in several annular grooves 42 on the cable. Then, several support keels 6 are sequentially installed into the annular grooves 42 of the cable. During the installation process of the support keel 6, the two support members 61 of the support keel 6 are respectively installed into the annular groove 42 from both sides of the cable in a splicing manner, and the plug-in members 611 on the support members 61 pass through the through-holes 43 and extend into the fixing holes 521 to abut against each other. Then, the clamping member 54 is passed through the clamping hole 53 and sleeved on the clamping post 7, and the clamping member 54 is screwed until the two support members 61 are fixed. Then, the connecting protrusions 90 of the two guard plates 8 are respectively installed into the connecting grooves 612 on the two symmetrically arranged guard plates 8. Then, the clamping member 54 is continuously screwed. During the downward movement of the clamping member 54, it pushes the adjusting member 93 to move into the notch 711. During this process, the adjusting member 93 pulls one end of the connecting member 91 to move into the connecting hole 901 on the connecting protrusion 90 through the connecting line 94, thereby realizing the fixation of the guard plate 8. The operation is simple and convenient.

[0049] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all effective changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A cross-linked polyethylene insulated power cable, comprising a plurality of cores (1) wound together, the core (1) including a conductor (11) and an insulating shielding layer (12) wrapped around the periphery of the conductor (11), an inner sheath (2) is provided outside the core (1), a waterproof filling layer (21) is arranged between the inner sheath (2) and the core (1), a steel tape armor layer (3) is wrapped around the outside of the inner sheath (2), and an outer sheath (4) is wrapped around the outside of the steel tape armor layer (3), characterized in that: The top of the outer sheath (4) is provided with a mounting plane (41), and a fixing keel (5) is detachably mounted on the mounting plane (41). A plurality of annular support keels (6) are sleeved around the outer sheath (4), and the support keels (6) are detachably connected to the fixing keel (5).

2. The cross-linked polyethylene insulated power cable according to claim 1, characterized in that, The mounting plane (41) is provided with a mounting groove (411) along the length direction of the cable. The fixing keel (5) includes a support part (51) and a connecting part (52) which are integrally arranged up and down. The connecting part (52) extends into the mounting groove (411), and a plurality of fixing holes (521) are formed in the connecting part (52). The plurality of fixing holes (521) correspond to the plurality of support keels (6) one by one; A plurality of through holes (43) are formed in the outer sheath (4), and the plurality of through holes (43) are in one-to-one correspondence and communication with the plurality of fixing holes (521); The support keel (6) includes two symmetrically arranged arc-shaped support members (61). The top of the support member (61) is integrally provided with a plug-in member (611) adapted to the through hole (43) and the fixing hole (521). The plug-in member (611) passes through the through hole (43) and extends into the fixing hole (521).

3. The cross-linked polyethylene insulated power cable according to claim 2, characterized in that, A plurality of annular grooves (42) are formed on the outer peripheral surface of the outer sheath (4). The plurality of annular grooves (42) correspond to the plurality of support keels (6) one by one. The through hole (43) is opened to the top of the annular groove (42), and the support keel (6) is located in the annular groove (42).

4. A cross-linked polyethylene insulated power cable according to claim 3, characterized in that, The depth of the annular groove (42) is less than the thickness of the support keel (6).

5. The cross-linked polyethylene insulated power cable according to claim 3, characterized in that, An arrangement groove (6111) is provided on the end face of the end of the plug-in member (611) far from the support member (61). The arrangement groove (6111) extends to the upper surface of the plug-in member (611). A fixing column (71) is vertically fixed in the arrangement groove (6111). The cross section of the fixing column (71) is semicircular. The plug-in members (611) on the two support keels (6) are inserted into the fixing holes (521) to form a cylindrical clamping column (7) by splicing. A thread is provided on the outer peripheral surface of the clamping column (7); A circular clamping hole (53) is formed in the upper wall of the corresponding fixing hole (521). A clamping member (54) with a circular cross section is slidably connected in the clamping hole (53). A screw hole (541) adapted to the clamping column (7) is formed at the bottom end of the clamping member (54). The clamping column (7) is threadedly connected in the screw hole (541).

6. A cross-linked polyethylene insulated power cable according to claim 4, wherein, An arc-shaped guard plate (8) is installed around the support keel (6).

7. An XLPE insulated power cable according to claim 6, characterized in that: A connecting mechanism (9) is arranged between the guard plate (8) and the support keel (6). The guard plate (8) is detachably connected to the support keel (6) through the connecting mechanism (9); A connecting groove (612) is formed on the outer peripheral surface of the support keel (6), and a groove (613) is formed on the inner side wall of the connecting groove (612); The connecting mechanism (9) includes a connecting member (91) adapted to the groove (613), and a connecting protrusion (90) fixedly installed on the inner peripheral surface of the guard plate (8); The connecting member (91) is slidably connected to the groove (613), the connecting protrusion (90) is inserted into the connecting groove (612), and a connecting hole (901) adapted to the connecting member (91) is provided on the connecting protrusion (90); The connecting mechanism (9) further includes a driving assembly for driving the connecting member (91) to reciprocate in the groove (613). Under the action of the driving assembly, one end of the connecting member (91) extends into the connecting hole (901).

8. A cross-linked polyethylene insulated power cable according to claim 7, characterized in that, The connecting groove (612) is a groove (613) opened along the arc of the support member (61), and the groove (613) is opened to one end of the connecting groove (612) away from the plug-in member (611); A notch (711) is vertically provided on the fixed column (71), and a sliding groove (7111) is horizontally opened on the inner wall of the notch (711); A communication hole (614) communicating with the connecting groove (612) is opened on the inner wall of the arrangement groove (6111); The driving assembly includes an adjusting member (93) slidably connected to the notch (711). A slider (931) is fixedly connected to the adjusting member (93), the slider (931) is slidably connected to the sliding groove (7111), a guiding inclined surface (932) is provided on one side of the adjusting member (93), and the guiding inclined surface (932) extends out of the notch (711); The driving assembly further includes an elastic member (92) disposed in the groove (613). One end of the elastic member (92) is connected to the connecting member (91), and the other end of the elastic member (92) is connected to the support member (61). Under the action of the elastic member (92), the connecting member (91) is located in the groove (613); A connecting line (94) is provided between the connecting member (91) and the adjusting member (93), and the connecting line (94) passes through the communication hole (614).

9. A cross-linked polyethylene insulated power cable according to claim 7, characterized in that, An observation window (615) communicating with the groove (613) is provided on the outer peripheral surface of the support member (61). A hook (921) is fixedly connected to the elastic member (92), and a hanging ring (6131) is provided in the groove (613), and the hook (921) is hooked to the hanging ring (6131); A sliding track (7112) is vertically opened on the upper wall of the sliding groove (7111), and the sliding track (7112) extends to the upper surface of the fixed column (71). Through holes (616) for the connecting line (94) to pass through and communicating with the communication hole (614) are opened on the outer peripheral surface of the support member (61) and the upper surface of the plug-in member (611).

10. A cross-linked polyethylene insulated power cable according to claim 8, characterized in that, The connecting line (94) includes a main body portion (941) and a mounting portion (942) which are integrally provided. The main body portion (941) is connected to the connecting member (91), and the mounting portion (942) is connected to the adjusting member (93). The diameter of the through hole (616) is larger than the mounting portion (942) and smaller than the main body portion (941).

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