Buried cable

Abstract

The utility model discloses a buried cable, relates to the cable technical field, the buried cable comprises a bunched wire pipe, a braid layer, a reinforcing layer and an oversheath which are arranged from inside to outside in order, the braid layer is a multi-layer braid structure and wraps the periphery of the bunched wire pipe, the reinforcing layer comprises an armor tape layer and a plurality of groups of fixing rings, and the armor tape layer and the plurality of groups of fixing rings are arranged on the outer sheath. The armor tape layer is formed by spirally surrounding a plurality of metal sheets on the outer surface of the braid layer, the fixing ring is arranged on the peripheral side of the armor tape layer in a sleeving manner, and the outer sheath is formed by coating insulating rubber on the peripheral side of the reinforcing layer through an extrusion coating process and curing the insulating rubber. According to the technical scheme of the invention, the tensile strength, compression resistance and bending resistance of the cable can be effectively improved, the overall rigidity and mechanical strength of the cable are improved, the cable body can be prevented from being extruded and punctured by an external object in the burying process, and the cable can be prevented from being crushed after being buried for a long time.

Description

Technical Field

[0001] This utility model relates to the technical field of cables, and in particular to a buried cable. Background Technology

[0002] Cables are wires used for power, communication, and related transmission purposes. They are essential basic materials for transmitting electrical energy, transmitting information, performing electromagnetic conversion, and manufacturing various motors, electrical appliances, and instruments. Cables are usually made of one or more groups of conductors (each group has at least two conductors) twisted together. Each group of conductors is insulated from each other and is often twisted around a central conductor. The entire cable is covered with a highly insulating outer layer, which gives it the characteristics of being internally energized and externally insulated.

[0003] Some existing cables are laid underground. Such cables require strong compressive strength. However, the underground cables currently in use are not much different from the above-ground cables. Their compressive strength is relatively weak. When buried deep underground and subjected to greater pressure, coupled with long-term soil erosion, the internal core is easily crushed and prone to leakage. Utility Model Content

[0004] In order to improve the compressive strength of buried cables, this application provides a buried cable.

[0005] The buried cable provided in this application adopts the following technical solution:

[0006] A buried cable includes, from the inside out, a bundled conduit, a braided layer, a reinforcing layer, and an outer sheath;

[0007] The braided layer is a multi-layer braided structure covering the outer periphery of the bundled conduit; the reinforcing layer includes an armored tape layer and several sets of fixing rings. The armored tape layer is formed by several metal sheets spirally wrapped around the outer surface of the braided layer. The fixing rings are sleeved on the periphery of the armored tape layer and arranged sequentially and spaced apart along the extension direction of the cable; the outer sheath is formed by extruding insulating rubber onto the outer periphery of the reinforcing layer and curing it.

[0008] By adopting the above technical solutions, the tensile, compressive and bending resistance of the cable can be effectively improved, while the overall rigidity and mechanical strength of the cable can be increased. This not only helps to prevent the cable body from being squeezed and punctured by external objects during the burial process, but also helps to prevent the cable from being crushed after being buried for a long time.

[0009] Optionally, the space between adjacent fixing rings is a filling area, and the surface of the armor belt layer located in the filling area is covered with a foamed rubber pad, and the outer diameter of the filling area is consistent with the outer diameter of the fixing ring after filling.

[0010] By adopting the above technical solution, the overall cross-section of the cable can be kept circular, which not only helps to improve the structural stability of the cable, but also facilitates the outer sheath wrapping process in subsequent production; in addition, the foamed rubber pad located in the filling area can effectively improve the impact resistance of the cable and help improve the overall performance of the cable.

[0011] Optionally, the metal sheet of the armor belt layer has several sets of snap-fit ​​grooves arranged along the upward extension direction. When the metal sheet surrounds and covers the braided layer, the snap-fit ​​grooves on the metal sheet curl up toward the side away from the braided layer and form snap-fit ​​pieces.

[0012] By adopting the above technical solution, when covering the foamed rubber pad in the filling area, the foamed rubber pad only needs to be rotated in the direction of the snap fastener. At this time, the snap fastener can be fully inserted into the foamed rubber pad and connect and fix the foamed rubber pad in the filling area. This is beneficial to improving the tightness of the foamed rubber pad in the filling area and also to the next step of extruding and covering the outer sheath.

[0013] Optionally, a sheath groove is provided on the outer periphery of the fixing ring. The sheath groove is fishbone shaped, and the fishbone direction of the sheath grooves on adjacent fixing rings is opposite.

[0014] By adopting the above technical solution, it is beneficial to further improve the bonding strength between the outer sheath and the reinforcing layer, and prevent the phenomenon of uneven stress caused by slippage due to the loose fit between the outer sheath and the reinforcing layer.

[0015] Optionally, the braided layer includes a metal shielding layer and a toughening and impact-resistant layer. The metal shielding layer is disposed on the outer periphery of the bundled conduit, and the toughening and impact-resistant layer is disposed on the outer periphery of the metal shielding layer. The metal shielding layer and the toughening and impact-resistant layer are braided using different processes.

[0016] By adopting the above technical solutions and using different weaving processes to set the metal shielding layer and the toughening and impact-resistant layer, a cross-reinforced braided network can be formed. This not only helps to improve the sealing performance and tightness of the braided layer, but also disperses stress and reduces the problem of short fatigue life and easy breakage of the braided layer due to stress concentration in the same direction.

[0017] Optionally, the metal shielding layer is selected from either tin-plated copper strip or galvanized steel strip, and is woven at a 30° weaving angle;

[0018] The toughening and impact-resistant layer is made of either Kevlar fiber tape or ultra-high molecular weight polyethylene fiber tape, and is woven at a 60° weaving angle.

[0019] By adopting the above technical solution, using a smaller weaving angle to weave the inner metal shielding layer is beneficial to improving the weaving tightness and axial tensile strength of the metal shielding layer, while using a larger weaving angle to weave the outer toughened impact-resistant layer is beneficial to improving the flexibility and lateral compressive strength of the toughened impact-resistant layer, thereby improving the overall mechanical strength of the woven layer.

[0020] Optionally, the bundled conduit includes several sets of wire core groups and a bundled conduit strip, the bundled conduit strip surrounding and wrapping around the outer periphery of the several sets of wire core groups; the wire core group includes a cable core, and a silicone layer and a wire core separator sequentially covering the outer periphery of the cable core.

[0021] By adopting the above technical solutions, the silicone layer and the core separator can fully separate different groups of cable cores, preventing short circuits from occurring when different groups of cable cores are twisted together at close range; in addition, by pre-integrating multiple groups of cores into one by the bundled tube, it is beneficial to improve the combination tightness of multiple groups of cores and reduce the overall size of the cable.

[0022] Optionally, cotton yarn is filled between the bundle tube and the core assembly.

[0023] By adopting the above technical solutions, the overall density of the core assembly can be effectively improved, and the overall outer diameter of the core assembly can be made more circular, which is beneficial to improving the mechanical strength and stress uniformity of the bundled tube.

[0024] In summary, the technical solution of this application includes at least one of the following beneficial effects:

[0025] 1. By sequentially setting a braided layer, a reinforcing layer, and an outer sheath on the outside of the bundled conduit, the tensile, compressive, and bending resistance of the cable can be effectively improved. At the same time, the overall rigidity and mechanical strength of the cable are improved. This not only helps to prevent the cable body from being squeezed and punctured by external objects during the burial process, but also helps to prevent the cable from being crushed after being buried for a long time. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of a buried cable in an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the lateral structure of a buried cable in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Bundled conduit; 11. Core assembly; 111. Cable core; 112. Silicone layer; 113. Core separator; 12. Bundled tube tape; 13. Cotton yarn; 2. Braided layer; 21. Metal shielding layer; 22. Toughened and impact-resistant layer; 3. Reinforcing layer; 31. Armor tape layer; 311. Snap-fit ​​groove; 312. Snap-fit ​​piece; 32. Retaining ring; 321. Sheath groove; 33. Filler area; 4. Outer sheath. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0031] This application discloses an underground cable. (Refer to...) Figure 1 and Figure 2 A buried cable includes a bundle conduit 1, a braided layer 2, a reinforcing layer 3, and an outer sheath 4, wherein the braided layer 2, the reinforcing layer 3, and the outer sheath 4 are sequentially arranged from the inside to the outside of the bundle conduit 1.

[0032] Reference Figure 1 The bundled conduit 1 includes core groups 11, a bundled tube 12, and cotton yarn 13. Several core groups 11 are twisted together, and the bundled tube 12 surrounds the outer periphery of the core groups 11, forming a single unit. The cotton yarn 13 fills the gaps between the core groups 11 and the bundled tube 12, effectively improving the tightness of the bundled conduit 1 and making its cross-section closer to a circle, thus improving its mechanical strength and stress uniformity. In this embodiment, four core groups 11 are provided, and these four groups combine to form a rectangular distribution structure.

[0033] Reference Figure 1 The core assembly 11 includes a cable core 111, a silicone layer 112, and a core separator 113. The silicone layer 112 covers the outer periphery of the cable core 111, and the core separator 113 is disposed outside the silicone layer 112. Specifically, to prevent internal short circuits between different core assemblies 11 from occurring due to easy damage to the silicone layer 112 or the core separator 113, the covering thickness of the silicone layer 112 is not less than 10 mm, and the number of winding layers of the core separator 113 is not less than 3. In this embodiment, the silicone layer 112 is specifically made of insulating silicone and is attached to the surface of the cable core 111 by a co-extrusion process, with a covering thickness of 10 mm; the core separator 113 is specifically formed by winding mica tape, and the number of winding layers of mica tape is 3.

[0034] Reference Figure 1 and Figure 2The braided layer 2 includes a metal shielding layer 21 and a toughening and impact-resistant layer 22. The metal shielding layer 21 is woven from metal braided tape around the outer periphery of the core assembly 11 to shield against induced currents and electromagnetic effects generated by the bundled conduit 1. The toughening and impact-resistant layer 22 is woven from non-metallic braided tape around the outer periphery of the metal shielding layer 21 and is used for insulation and to improve the overall tensile and impact resistance of the cable. Specifically, the metal braided tape can be either tin-plated copper tape or galvanized steel tape, and the non-metallic braided tape can be either Kevlar fiber tape or ultra-high molecular weight polyethylene fiber tape. In this embodiment, the metal shielding layer 21 is woven from tin-plated copper tape, and the toughening and impact-resistant layer 22 is woven from ultra-high molecular weight polyethylene fiber tape.

[0035] Furthermore, to improve the sealing performance and tightness of the braided layer 2 and reduce the problem of short fatigue life and easy breakage caused by unidirectional stress concentration, the braiding processes used for the metal shielding layer 21 and the toughened impact-resistant layer 22 are different. In this embodiment, the metal shielding layer 21 is braided at a 30° braiding angle, and the toughened impact-resistant layer 22 is braided at a 60° braiding angle.

[0036] Reference Figure 1 and Figure 2 The reinforcing layer 3 includes an armored tape layer 31, several sets of fixing rings 32, and a filling area 33. The armored tape layer 31 is formed by several aluminum sheets spirally wrapped around the outer periphery of the braided layer 2. The several sets of fixing rings 32 are sleeved around the periphery of the armored tape layer 31 and are arranged sequentially and spaced apart along the extension direction of the cable. The filling area 33 is located between adjacent fixing rings 32. The surface of the armored tape layer 31 in the filling area 33 is covered with a foamed rubber pad. After the foamed rubber pad is completely covered in the filling area 33, the outer diameter of the filling area 33 is consistent with the outer diameter of the fixing rings 32. Specifically, the aluminum sheets of the armored tape layer 31 are arranged with several sets of snap-fit ​​grooves 311 along the upward extension direction. The snap-fit ​​grooves 311 are U-shaped. When the aluminum sheets wrap around the braided layer 2, the snap-fit ​​grooves 311 curl up towards the side away from the braided layer 2, forming several sets of snap-fit ​​pieces 312.

[0037] When the foamed rubber pad is wrapped in the filling area 33, the foamed rubber pad is rotated in the direction where the snap fastener 312 is raised. At this time, several sets of snap fasteners 312 can be fully inserted into the foamed rubber pad and fully fix and connect the foamed rubber pad in the filling area 33. Therefore, it is not necessary to fix the foamed rubber pad again. This is beneficial to improve the tightness of the foamed rubber pad in the filling area 33 and also to facilitate the next step of the outer sheath 4 wrapping process.

[0038] Reference Figure 1 and Figure 2The outer sheath 4 is formed by extruding and coating insulating rubber onto the outer periphery of the reinforcing layer 3 and then curing it. Specifically, the outer periphery of the fixing ring 32 has a sheath groove 321. During the extrusion coating of the outer sheath 4, the insulating rubber of the outer sheath 4 can be fully embedded in the sheath groove 321, and after curing, the outer sheath 4 and the fixing ring 32 are fully bonded. Furthermore, the sheath groove 321 on the fixing ring 32 is fishbone shaped, and the fishbone direction of the sheath groove 321 on adjacent fixing rings 32 is opposite, which helps to further improve the bonding strength between the outer sheath 4 and the reinforcing layer 3, and can effectively prevent uneven stress caused by the outer sheath 4 and the reinforcing layer 3 not being securely fitted together and slipping.

[0039] The implementation principle of a buried cable in this application embodiment is as follows:

[0040] By sequentially setting a braided layer 2, a reinforcing layer 3, and an outer sheath 4 on the outside of the bundled conduit 1, the tensile, compressive, and bending resistance of the cable can be effectively improved. At the same time, the overall rigidity and mechanical strength of the cable are improved. This not only helps to prevent the cable body from being squeezed and punctured by external objects during the burial process, but also helps to prevent the cable from being crushed after being buried for a long time.

[0041] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A buried cable, characterized by: It includes, from the inside out, a bundled conduit (1), a braided layer (2), a reinforcing layer (3), and an outer sheath (4); The braided layer (2) is a multi-layer braided structure covering the outer periphery of the bundled conduit (1); the reinforcing layer (3) includes an armored tape layer (31) and several sets of fixing rings (32). The armored tape layer (31) is formed by several metal sheets spirally wrapped around the outer surface of the braided layer (2). The fixing rings (32) are sleeved on the outer periphery of the armored tape layer (31) and arranged sequentially and spaced apart along the extension direction of the cable; the outer sheath (4) is formed by insulating rubber covering the outer periphery of the reinforcing layer (3) and curing it.

2. A buried cable according to claim 1, characterized in that: Between adjacent fixing rings (32) is a filling area (33), and the surface of the armor belt layer (31) located in the filling area (33) is covered with a foamed rubber pad, and after filling, the outer diameter of the filling area (33) is consistent with the outer diameter of the fixing ring (32).

3. A buried cable according to claim 2, characterized in that: The metal sheet of the armor belt layer (31) has several sets of snap-fit ​​cuts (311) arranged along the upward extension direction. When the metal sheet surrounds and covers the braided layer (2), the snap-fit ​​cuts (311) on the metal sheet lift up toward the side away from the braided layer (2) and form snap-fit ​​pieces (312).

4. A buried cable according to claim 1, characterized in that: The outer periphery of the fixing ring (32) is provided with a sheath groove (321), the sheath groove (321) is fishbone shaped, and the fishbone direction of the sheath groove (321) on adjacent fixing rings (32) is opposite.

5. A buried cable according to claim 1, characterized in that: The braided layer (2) includes a metal shielding layer (21) and a toughening and impact-resistant layer (22). The metal shielding layer (21) is disposed on the outer periphery of the bundled conduit (1), and the toughening and impact-resistant layer (22) is disposed on the outer periphery of the metal shielding layer (21). The metal shielding layer (21) and the toughening and impact-resistant layer (22) are made using different braiding processes.

6. A buried cable according to claim 5, characterized in that: The metal shielding layer (21) is selected from either tin-plated copper strip or galvanized steel strip, and is woven at a braiding angle of 30°. The toughened and impact-resistant layer (22) is made of either Kevlar fiber tape or ultra-high molecular weight polyethylene fiber tape and is woven at a 60° weaving angle.

7. A buried cable according to claim 1, characterized in that: The bundled conduit (1) includes several sets of core groups (11) and a bundled tube strip (12), the bundled tube strip (12) surrounding and wrapping around the outer periphery of several sets of core groups (11); the core group (11) includes a cable core (111), and a silicone layer (112) and a core separator (113) sequentially covering the outer periphery of the cable core (111).

8. A buried cable according to claim 7, characterized in that: The space between the bundle tube (12) and the core group (11) is filled with cotton yarn (13).

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