Improved MPP power cable protection pipe

Abstract

The utility model relates to the technical field of MPP power cables, in particular to an improved MPP power cable protection tube, which comprises a protection tube outer tube and a protection tube inner tube, a protection tube compression resistance structure is arranged on the outer side of the protection tube outer tube, a tube body expansion joint structure is arranged on the outer side of the protection tube inner tube, and a wire through hole is fixedly arranged in the protection tube inner tube. According to the improved MPP power cable protection pipe, the expansion joints are transversely dug in the soft sleeve at intervals, the expansion joints are designed into inverted triangles with openings reduced from inside to outside, the soft sleeve can contract towards the two sides at the expansion joint positions in low temperature in winter, the expansion joints are separated and are not prone to breakage, and the expansion joints can expand towards the triangular gap in the middle after the soft sleeve is heated to expand in hot weather in summer, so that the expansion joints are not prone to breakage. By means of the design of the expansion joints, damage to the protection pipe caused by temperature difference generated by seasonal changes can be effectively reduced, and the service life of the improved MPP power cable protection pipe is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of MPP power cable technology, specifically to an improved MPP power cable protection pipe. Background Technology

[0002] MPP power cable is a special type of pipe made primarily of modified polypropylene. It is mainly used for the protection of power cables. MPP power cable protection pipes have excellent electrical insulation, high heat distortion temperature and low temperature impact resistance, and higher tensile and compressive strength than HDPE.

[0003] For example, the authorization announcement number "CN205489339U" describes an MPP power cable protection pipe. This pipe has a robust structure, is easy to install, and effectively prevents moisture and the increasing electric field inside the pipe from affecting the normal operation of the cable, ensuring safe maintenance of the pipeline later. Existing MPP power cable protection pipes are designed to be sturdy and robust to improve the protective performance of the pipe body. However, these pipes are generally installed outside the MPP cable to be protected and then buried in the soil along with the cable. The temperature difference between winter and summer in the underground soil is significant, so the surface of the protection pipe is easily affected by temperature changes throughout the year. When the temperature is too high, the heated pipe will expand, while in winter, the pipe will contract inward due to the low temperature. Therefore, the thermal expansion and contraction reaction of the pipe body is relatively large, which can lead to cracking or irregular breakage of the protection pipe, affecting the overall service life of the MPP power cable protection pipe. Utility Model Content

[0004] The purpose of this utility model is to solve the problem of the short service life of existing MPP power cable protection pipes, and to propose an improved MPP power cable protection pipe.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A modified MPP power cable protection pipe is designed, comprising an outer protection pipe and an inner protection pipe. The outer protection pipe is provided with a pressure-resistant structure on its outer side, and the inner protection pipe is provided with a pipe expansion joint structure on its outer side. A through hole is fixedly opened inside the inner protection pipe.

[0007] Preferably, the protective pipe pressure-resistant structure includes a lower support layer and pressure-resistant columns. Multiple pressure-resistant columns are fixedly connected to the inner wall of the outer pipe of the protective pipe. Weight-reducing grooves are fixedly opened on the inner side of the multiple pressure-resistant columns. The lower support layer is movably arranged below the outer pipe of the protective pipe. An arch is fixedly connected to the top of the upper support layer.

[0008] Preferably, the tube expansion joint structure includes a metal network layer and a flexible sleeve. The metal network layer is fixedly sleeved on the outside of the inner tube of the protective tube, and the flexible sleeve is fixedly sleeved on the outside of the metal network layer. Multiple expansion joints are fixedly opened on the inside of the flexible sleeve.

[0009] Preferably, the plurality of expansion joints are equidistantly distributed circumferentially along the outer side of the metal network layer, the outer wall of the flexible sleeve is movably connected to the inner side of the weight reduction groove, and the outer wall of the flexible sleeve is fixedly connected to the inner side of the pressure-resistant column.

[0010] Preferably, a fixing rib structure is provided below the lower support layer. The fixing rib structure includes long ribs and short ribs. Multiple long ribs are fixedly connected to both sides of the lower end of the outer wall of the lower support layer, and multiple short ribs are fixedly connected to the bottom end of the lower support layer. Multiple embedded cones are fixedly connected to the lower ends of the long ribs and short ribs.

[0011] Preferably, the inner wall of the dome is in movable contact with the top end of the outer tube of the protective pipe.

[0012] The improved MPP power cable protection pipe proposed in this utility model has the following advantages: the flexible sleeve is horizontally chiseled at intervals, and the expansion joint is an inverted triangle design with the opening decreasing from the inside to the outside. In winter, when the temperature is low, the flexible sleeve will shrink to both sides at the expansion joint, and the expansion joint will not easily break. In summer, when the weather is hot, the expansion joint will expand towards the central triangular gap after the flexible sleeve is heated and expanded, avoiding the expansion joint from tearing the pipe structure. The expansion joint design can effectively reduce the damage to the protection pipe caused by temperature differences due to seasonal changes, and improve the service life of the improved MPP power cable protection pipe. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 for Figure 1 A frontal sectional view;

[0015] Figure 3 for Figure 1 A side sectional view;

[0016] Figure 4 for Figure 2 Enlarged sectional view of section A in the middle;

[0017] Figure 5 for Figure 2 Enlarged sectional view of section B in the middle;

[0018] Figure 6 for Figure 3 Enlarged sectional view of section C.

[0019] In the diagram: 1. Outer protective tube, 2. Inner protective tube, 3. Protective tube pressure-resistant structure, 31. Lower support layer, 32. Arch, 33. Pressure-resistant column, 34. Weight-reducing groove, 4. Expansion joint structure of the tube body, 41. Metal network layer, 42. Flexible sleeve, 43. Expansion joint, 5. Fixing rib structure, 51. Long rib, 52. Short rib, 53. Embedded cone, 6. Through hole. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Example 1:

[0022] Please see Figure 1-6 In this embodiment, a modified MPP power cable protection pipe includes an outer protection pipe 1 and an inner protection pipe 2. The outer protection pipe 1 is provided with a protective pipe pressure-resistant structure 3 on its outer side, and the inner protection pipe 2 is located inside the outer protection pipe 1. Both the outer protection pipe 1 and the inner protection pipe 2 are made of high-strength pressure-resistant modified polypropylene material, which has good electrical insulation and toughness. The double-layer pipe structure is used to improve the protection effect of the internal cable. The outer side of the inner protection pipe 2 is provided with a pipe body expansion joint structure 4, and a through hole 6 is fixedly opened inside the inner protection pipe 2.

[0023] The protective tube pressure-resistant structure 3 includes a lower support layer 31 and pressure-resistant columns 33. Multiple pressure-resistant columns 33 are fixedly connected to the inner wall of the outer tube 1 of the protective tube. The pressure-resistant columns 33 are made of relatively thick and short aluminum alloy material. The pressure-resistant columns 33 are arranged on the inner circumference to form a stable and firm support for the outer tube 1 of the protective tube. Weight-reducing grooves 34 are fixedly opened on the inner side of the multiple pressure-resistant columns 33.

[0024] The weight-reducing groove 34 is opened between each pressure-resistant column 33 to reduce the input of finished materials. The lower support layer 31 is movably set below the outer tube 1 of the protective tube. The top of the upper support layer 31 is fixedly connected to the arch 32. Both the lower support layer 31 and the arch 32 are semi-circular steel structures welded at the connection. The lower support layer 31, together with the arch 32, wraps the protective tube structure inside, which can effectively improve its compressive strength. The inner wall of the arch 32 is movably fitted with the top of the outer tube 1 of the protective tube.

[0025] The expansion joint structure 4 of the pipe body includes a metal network layer 41 and a flexible sleeve 42. The metal network layer 41 is fixedly sleeved on the outside of the inner tube 2 of the protective pipe. The metal network layer 41 adopts the prior art disclosed in the prior art document authorized by the prior art document with the publication number "CN205489339U" entitled "An MPP Power Cable Protective Pipe". The metal network layer 41 adopts a honeycomb structure design with multiple branches, which can connect the inner and outer sides of the protective pipe and stabilize the main shape of the protective pipe. The flexible sleeve 42 is fixedly sleeved on the outside of the metal network layer 41. The flexible sleeve 42 is a layer of tough polypropylene material sleeved on the outside of the inner tube 2 of the protective pipe.

[0026] The flexible sleeve 42 has expansion joints 43 cut horizontally at intervals. The expansion joints 43 are designed as inverted triangles with the opening decreasing from the inside to the outside. In winter, when the temperature is low, the flexible sleeve 42 will shrink to both sides at the expansion joints 43. The expansion joints 43 are separated and are not easy to break. In hot summer weather, the expansion joints 43 will expand towards the middle triangular gap after the flexible sleeve 42 is heated and expanded, so as to avoid prying open the tube structure. Multiple expansion joints 43 are fixedly opened on the inner side of the flexible sleeve 42.

[0027] Multiple expansion joints 43 are distributed equidistantly in a circle along the outer side of the metal network layer 41. The outer wall of the flexible sleeve 42 is movably connected to the inner side of the weight reduction groove 34, and the outer wall of the flexible sleeve 42 is fixedly connected to the inner side of the pressure-resistant column 33.

[0028] The metal network layer 41 adopts a honeycomb structure design with multiple branches, which can connect the inner and outer sides of the protective tube and stabilize the main shape of the protective tube. The flexible sleeve 42 is made of a layer of tough polypropylene material that is sleeved on the outside of the inner tube 2 of the protective tube. The flexible sleeve 42 has expansion joints 43 cut horizontally at intervals. The expansion joints 43 are inverted triangular designs with the opening decreasing from the inside to the outside. In winter, when the temperature is low, the flexible sleeve 42 will shrink to both sides at the expansion joints 43. The expansion joints 43 are not easy to break. In summer, when the temperature is hot, the expansion joints 43 will expand towards the central triangular gap after the flexible sleeve 42 is heated and expanded, avoiding the tube structure from being stretched. The expansion joint design can effectively reduce the damage to the protective tube caused by temperature difference due to seasonal changes and improve the service life of the improved MPP power cable protective tube.

[0029] Working principle:

[0030] The improved MPP power cable protection pipe is used to wrap around the outside of the circuit cable and then bury it underground, so as to achieve a stable and solid protection effect for the cable pipeline in the soil layer.

[0031] Main structure of the improved MPP power cable protection pipe:

[0032] The inner tube 2 of the protective tube is set inside the outer tube 1 of the protective tube. Both the outer tube 1 and the inner tube 2 of the protective tube are made of high-strength and pressure-resistant modified polypropylene material, which has good electrical insulation and toughness. The double-layer tube structure is used to improve the protection effect of the internal cable.

[0033] External protective structure of the improved MPP power cable protection conduit:

[0034] The pressure-resistant column 33 is made of relatively thick and short aluminum alloy material. The pressure-resistant column 33 has a circumference on its inner side to form a stable and firm support for the outer protective tube 1. The weight-reducing groove 34 is opened between each pressure-resistant column 33 to reduce the input of finished materials. The lower support layer 31 and the arch 32 are both semi-circular steel structures welded together at the connection. The lower support layer 31, together with the arch 32, wraps the protective tube structure inside, which can effectively improve its compressive strength.

[0035] The improved MPP power cable protection pipe features an inner expansion and crack resistance structure:

[0036] The metal network layer 41 adopts a honeycomb structure design with multiple branches, which can connect the inner and outer sides of the protective tube and stabilize the main shape of the protective tube. The soft sleeve 42 is made of a layer of tough polypropylene material that is sleeved on the outside of the inner tube 2 of the protective tube. The soft sleeve 42 has expansion joints 43 cut horizontally at intervals. The expansion joints 43 are inverted triangular designs with the opening decreasing from the inside to the outside. In winter, when the temperature is low, the soft sleeve 42 will shrink to both sides at the expansion joints 43. The expansion joints 43 are not easy to break. In hot summer weather, the expansion joints 43 will expand towards the central triangular gap after the soft sleeve 42 is heated and expanded, so as to avoid the tube structure being torn apart.

[0037] Example 2:

[0038] Please see Figure 1-6 In this embodiment, an improved MPP power cable protection pipe further includes a fixing rib structure 5 provided below the lower support layer 31. The fixing rib structure 5 includes long ribs 51 and short ribs 52. Multiple long ribs 51 are fixedly connected to the lower ends of the outer wall of the lower support layer 31 on both sides. The long ribs 51 of the fixing ribs are arranged on the outer wall near the two sides of the lower support layer 31, and the short ribs 52 of the fixing ribs are arranged on the outer wall near the middle of the lower support layer 31.

[0039] The lower ends of the short ribs 52 and the long ribs 51 are flush, so the lower support layer 31 can be stably and flatly placed at the location where power cables need to be laid. The lower end of the embedding cone 53 is designed with a pointed tip so that it can be driven deep into the soil to help stabilize it. Multiple short ribs 52 are fixedly connected to the bottom of the lower support layer 31, and multiple embedding cones 53 are fixedly connected to the lower ends of the long ribs 51 and the short ribs 52.

[0040] Working principle:

[0041] The long ribs 51 of the fixing ribs are set on the outer walls on both sides of the lower support layer 31, and the short ribs 52 of the fixing ribs are set on the outer wall of the lower support layer 31 near the middle. The lower ends of the short ribs 52 and the long ribs 51 are flush, so the lower support layer 31 can be stably and flatly placed in the position where power cables need to be laid. The lower end of the embedding cone 53 is designed with a pointed tip so that it can be driven deep into the soil to help stabilize it.

[0042] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A modified MPP electric power cable protection pipe comprising a protection pipe outer tube (1) and a protection pipe inner tube (2), characterized in that: The outer tube (1) of the protective tube is provided with a protective tube pressure-resistant structure (3), the outer tube (2) of the protective tube is provided with a tube body expansion joint structure (4), and the inner tube (2) of the protective tube is fixedly provided with a through hole (6).

2. The modified MPP electric cable protection pipe according to claim 1, characterized in that: The protective pipe pressure-resistant structure (3) includes a lower support layer (31) and pressure-resistant columns (33). Multiple pressure-resistant columns (33) are fixedly connected to the inner wall of the outer pipe (1) of the protective pipe. Weight-reducing grooves (34) are fixedly opened on the inner side of the multiple pressure-resistant columns (33). The lower support layer (31) is movably arranged below the outer pipe (1) of the protective pipe. An arch (32) is fixedly connected to the top of the lower support layer (31).

3. The modified MPP electric cable protection pipe according to claim 1, characterized in that: The expansion joint structure (4) of the tube body includes a metal network layer (41) and a soft sleeve (42). The metal network layer (41) is fixedly sleeved on the outside of the inner tube (2) of the protective tube. The soft sleeve (42) is fixedly sleeved on the outside of the metal network layer (41). Multiple expansion joints (43) are fixedly opened on the inside of the soft sleeve (42).

4. The modified MPP electric cable protection pipe according to claim 3, characterized in that: Multiple expansion joints (43) are distributed equidistantly in a circle along the outer side of the metal network layer (41). The outer wall of the soft sleeve (42) is movably connected to the inner side of the weight reduction groove (34), and the outer wall of the soft sleeve (42) is fixedly connected to the inner side of the pressure-resistant column (33).

5. The modified MPP electric cable protection pipe according to claim 2, characterized in that: The lower support layer (31) is provided with a fixing rib structure (5), which includes long ribs (51) and short ribs (52). Multiple long ribs (51) are fixedly connected to both sides of the lower end of the outer wall of the lower support layer (31), and multiple short ribs (52) are fixedly connected to the bottom end of the lower support layer (31). Multiple embedded cones (53) are fixedly connected to the lower ends of the long ribs (51) and short ribs (52).

6. The modified MPP electric cable protection pipe according to claim 2, characterized in that: The inner wall of the arch (32) is in contact with the top of the outer tube (1) of the protective tube.

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