Mpp cable protection pipe

Abstract

The application provides a MPP cable protection pipe, and relates to the technical field of cable protection pipes.The MPP cable protection pipe comprises an outer pipe, an inner pipe arranged at the center of the outer pipe, and a containing area arranged between the outer pipe and the inner pipe.A plurality of fixed-point shuttle-shaped partitions are equidistantly arranged in the circumferential direction in the containing area.The one end of the fixed-point shuttle-shaped partition is fixedly connected with the inner wall of the outer pipe, and the other end of the fixed-point shuttle-shaped partition is fixedly connected with the outer wall of the inner pipe.The fixed-point shuttle-shaped partition is a shuttle-shaped pipe with a wide middle part and pointed two ends.The fixed-point shuttle-shaped partition is used for limiting the cable in the middle area of the containing area.A movable partition is arranged between adjacent fixed-point shuttle-shaped partitions, and the movable partition is used for matching and isolating different types of cables.

Description

Technical Field

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

[0002] MPP cable protection pipe is a power cable protection pipe made of modified polypropylene as the main raw material. It has the characteristics of high temperature resistance and external pressure resistance, and is widely used in municipal, telecommunications and power pipeline projects.

[0003] Existing MPP cable protection pipes mostly have a single through-slot structure, making it easy for multiple cables to become tangled and pile up when run through the same conduit. This not only leads to cable twisting, compression, and even damage after installation, but also causes great inconvenience for later inspection and maintenance. Although some existing protective pipes use partitions to divide the interior into multiple areas, these partitions are mostly fixed structures, and the number, position, and size of the compartments cannot be adjusted once they are formed. In actual engineering projects, the type, quantity, and thickness of cables often vary, and fixed partitions cannot be flexibly adapted to actual needs, lacking engineering adaptability. Multiple cables running in the same conduit continuously generate heat. If the cables are stacked disorderly or arranged tightly, the heat is difficult to dissipate, causing the temperature inside the conduit to rise continuously. Concentrated heat accumulation accelerates the aging of the cable insulation layer, shortens the cable's service life, and may even cause safety accidents. Existing protective pipes have poor compressive strength. The single-walled pipe structure is prone to deformation or even cracking under external soil pressure, vehicle loads, or construction compaction, making it difficult to provide reliable mechanical protection for the internal cables. Summary of the Invention

[0004] (a) Technical problems to be solved The purpose of this invention is to provide an MPP cable protection pipe, which aims to solve the technical problems in the prior art such as easy cable tangling and accumulation, lack of flexibility in the partition structure, poor heat dissipation performance, and insufficient compressive strength. (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: An MPP cable protection conduit includes an outer tube with an inner tube at its center. A receiving area is provided between the outer and inner tubes. Within the receiving area, a plurality of fixed-point spindle-shaped partitions are equidistantly arranged in a circumferential direction. One end of each fixed-point spindle-shaped partition is fixedly connected to the inner wall of the outer tube, and the other end is fixedly connected to the outer wall of the inner tube. Each fixed-point spindle-shaped partition is a spindle-shaped tube with pointed ends and a wide middle section. The fixed-point spindle-shaped partitions are used to confine the cable in the middle region of the receiving area. A movable partition is provided between adjacent fixed-point spindle-shaped partitions. The movable partitions are used to match and isolate different types of cables.

[0005] Preferably, each of the fixed-point spindle-shaped partitions includes: two first broad arc plates, the two first broad arc plates being symmetrically distributed along the axis of the outer tube, and both ends of the two first broad arc plates being connected to first narrow arc plates. Two first narrow arc plates are provided at the ends of the two first broad arc plates near the inner wall of the outer tube, forming a first pointed plate. Two first narrow arc plates are also provided at the ends of the two first broad arc plates away from the inner wall of the outer tube, forming a second pointed plate. A first fixed locking strip is fixedly connected to one end of the first pointed plate, and a second fixed locking strip is fixedly connected to one end of the second pointed plate. The inner wall of the outer tube is provided with outer grooves at equal intervals in the circumferential direction, and the outer wall of the inner tube is provided with a plurality of inner grooves at equal intervals in the circumferential direction. The first fixed locking strip is engaged and fixedly connected to the outer groove, and the second fixed locking strip is engaged and fixedly connected to the inner groove.

[0006] Preferably, both the first and second pointed corner plates are V-shaped plates, and the opening width of the first and second pointed corner plates gradually increases along the radial direction of the outer tube. The opening width of the first and second pointed corner plates at the end closer to the outer tube is smaller than the opening width at the end farther from the outer tube.

[0007] Preferably, the distance between the two first wide arc plates increases first and then decreases along the radial direction of the outer tube, the distance between the middle of the two first wide arc plates is greater than the distance between any other position of the two first wide arc plates, and a cable is adapted to be installed in the space between the two first wide arc plates, the inner diameter of the first wide arc plate is 1.6 to 1.8 times the diameter of the cable.

[0008] Preferably, the moving point partition includes a moving point spindle-shaped partition, a circular wide arc plate, and a straight partition. The moving point spindle-shaped partition, the circular wide arc plate, and the straight partition are all disposed within the receiving area, and at least one of the moving point spindle-shaped partition, the circular wide arc plate, and the straight partition is disposed between adjacent fixed point spindle-shaped partitions.

[0009] Preferably, the moving point spindle-shaped partition includes: two second broad arc plates, which are symmetrically distributed along the axis of the outer tube. Each second broad arc plate is connected to two ends of a second narrow arc plate. Each second narrow arc plate is connected to a first moving clip at the end away from the second broad arc plate. One first moving clip is slidably connected to the outer groove, and the other first moving clip is slidably connected to the inner groove. The moving point spindle-shaped partition is a spindle-shaped tube, and a cable is placed in the open area in the middle of the moving point spindle-shaped partition.

[0010] Preferably, the circular wide arc plate includes: two third wide arc plates, the two third wide arc plates are symmetrically distributed along the axis of the outer tube, and each third wide arc plate has a second moving clip connected to both ends, one of the second moving clips is slidably connected to the outer groove, and the other of the second moving clips is slidably connected to the inner groove.

[0011] Preferably, the diameter of the circular wide arc plate is larger than the diameter of the moving point shuttle-shaped partition, the projection of the circular wide arc plate is nearly circular, and the projection of the moving point shuttle-shaped partition is shuttle-shaped.

[0012] Preferably, the outer tube and the inner tube are coaxially arranged, and the outer tube, the inner tube, the fixed-point spindle-shaped partition and the moving-point partition are all made of modified polypropylene material.

[0013] Preferably, the number of fixed-point shuttle-shaped partitions is 4 to 8, and the number of outer grooves and inner grooves is the same as the number of fixed-point shuttle-shaped partitions and they are set in a one-to-one correspondence. (III) Beneficial Effects Compared with the prior art, the present invention provides an MPP cable protection pipe, which has the following beneficial effects: 1. This invention employs a double-layer tube structure with an outer tube and an inner tube. The outer and inner tubes are fixedly connected by fixed-point spindle-shaped partitions, which act as a supporting framework to firmly connect the outer and inner tubes into one unit. This double-layer tube structure significantly improves the overall compressive strength and impact resistance of the protective tube. The fixed-point spindle-shaped partitions are evenly distributed along the circumference, forming a multi-point support system between the outer and inner tubes, resulting in uniform stress distribution and effectively preventing local deformation and damage to the tube body. Simultaneously, the wedge-shaped structure of the V-shaped corner plate further enhances the connection stability between the fixed-point spindle-shaped partition and the tube wall. When the partition is subjected to an outward pulling force, the V-shaped corner tightens, providing a self-locking function to prevent accidental loosening of the partition and making the entire protective tube structure more reliable.

[0014] 2. The fixed-point shuttle-shaped partition divides the conduit into multiple independent areas distributed along the circumference. Each area can hold one or more cables, achieving classified management and orderly arrangement of cables. Moving-point shuttle-shaped partitions, circular wide-arc plates, or straight partitions can be installed between adjacent fixed-point shuttle-shaped partitions as needed, forming a more detailed cable separation system. This multi-layered separation structure effectively prevents multiple cables from tangling, twisting, and piling up inside the conduit. When a specific cable needs maintenance, it can be quickly located and pulled out without the need for laborious searching through tangled wire bundles. The moving-point partition slides through a moving clip and slot, allowing for easy disassembly and reinstallation, facilitating cable replacement and line adjustment, significantly reducing maintenance difficulty and construction time.

[0015] 3. The "pointed at both ends and wide in the middle" structure of the shuttle-shaped partition ensures line contact rather than surface contact between the cable and the broad arc plate. This small contact area exposes most of the cable surface to the air, facilitating heat dissipation. The inner diameter of the broad arc plate is 1.6 to 1.8 times the cable diameter, providing ample air gaps around the cable and preventing tight contact between the cable and the partition, thus providing an effective heat dissipation channel. The containment area between the outer and inner tubes, along with the heat dissipation space inside the inner tube, constitute multiple heat dissipation paths. Heat generated by the cable can be conducted to the broad arc plate through the air gaps, and then transferred to the outer tube wall via the fixed-point shuttle-shaped partitions, dissipating to the external environment. This excellent heat dissipation performance effectively prevents heat accumulation, inhibits accelerated aging of the cable insulation due to high temperatures, and extends the cable's service life.

[0016] 4. Moving point partitions include three different types: moving point shuttle-shaped partitions, circular wide-arc partitions, and straight partitions. Among them, the moving point shuttle-shaped partition is suitable for limiting the position of a conventional single cable; the circular wide-arc partition is suitable for accommodating cables with larger diameters or multiple bundled cables; and the straight partition is suitable for dividing the accommodating area into simple fan-shaped regions. The moving point partition is slidably connected to the outer and inner grooves via moving clips, and can be flexibly installed and adjusted at any position between adjacent fixed-point shuttle-shaped partitions according to actual needs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a front view of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the outer tube, inner tube, and fixed-point spindle-shaped partition of the present invention.

[0020] Figure 4 for Figure 3 A diagram showing the separation of the inner and outer tubes and the internal structure of the outer tube.

[0021] Figure 5 This is a schematic diagram of the structure of the fixed-point spindle-shaped partition of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of the outer tube, inner tube, moving point spindle-shaped partition, ring-shaped partition, and straight partition of the present invention.

[0023] In the diagram: 11 Outer tube, 12 Inner tube, 21 Outer groove, 22 Inner groove, 31 Reception area, 32 Heat dissipation channel, 4 Fixed point spindle-shaped partition, 41 First wide arc plate, 42 Sharp corner plate, 421 First narrow arc plate, 43 Fixed clamping strip, 5 Moving point partition, 51 Moving point spindle-shaped partition, 511 Second wide arc plate, 512 Second narrow arc plate, 513 First moving clamping strip, 52 Circular partition, 521 Third wide arc plate, 522 Second moving clamping strip, 53 Straight partition. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1-6 This invention provides an MPP cable protection pipe, including an outer tube 11, an inner tube 12 coaxially disposed at the center of the outer tube 11, and an annular receiving area 31 formed between the outer tube 11 and the inner tube 12. Both the outer tube 11 and the inner tube 12 are made of modified polypropylene material, which has the characteristics of high strength, corrosion resistance and good insulation performance.

[0026] Within the receiving area 31, 4 to 8 fixed-point spindle-shaped partitions 4 are equidistantly arranged in a circumferential direction. One end of each fixed-point spindle-shaped partition 4 is fixedly connected to the inner wall of the outer tube 11, and the other end is fixedly connected to the outer wall of the inner tube 12. The fixed-point spindle-shaped partition 4 is a spindle-shaped tube structure with pointed ends and a wide middle, used to confine the cable in the central area of ​​the receiving area 31. The fixed-point spindle-shaped partition 4 serves as a supporting frame, firmly connecting the outer tube 11 and the inner tube 12 into a single, stable double-layer tube structure.

[0027] Fixed-point shuttle-shaped partitions 4 are evenly distributed along the circumference within the receiving area 31, with equal angles between adjacent fixed-point shuttle-shaped partitions 4, thus uniformly dividing the entire annular receiving area 31 into several sector-shaped units of the same size. This uniformly distributed layout ensures that the cables are evenly arranged in the circumferential direction, avoiding excessive local stress on the pipe body due to concentrated cable distribution on one side, and contributing to the overall balance and stability of the pipe body under stress.

[0028] Each fixed-point spindle-shaped partition 4 includes two first broad arc plates 41, which are symmetrically distributed along the axis of the outer tube 11. Both ends of the two broad arc plates 41 are connected to first narrow arc plates 421. Two first narrow arc plates 421 are provided at the ends of the two broad arc plates 41 closest to the inner wall of the outer tube 11, forming a first pointed plate 42. Two first narrow arc plates 421 are also provided at the ends of the two broad arc plates 41 furthest from the inner wall of the outer tube 11, forming a second pointed plate 42. A first fixed clamping strip 43 is fixedly connected to one end of the first pointed plate 42, and a second fixed clamping strip 43 is fixedly connected to one end of the second pointed plate 42. The inner wall of the outer tube 11 has equidistant outer grooves 21 in the circumferential direction, and the outer wall of the inner tube 12 has equidistant inner grooves 22 in the circumferential direction. The first locking strip 43 is locked to the outer groove 21, and the second locking strip 43 is locked to the inner groove 22, thereby achieving a firm installation of the fixed-point shuttle-shaped partition 4 between the outer tube 11 and the inner tube 12.

[0029] Both the first and second pointed-corner plates 42 are V-shaped plates, with their opening width gradually increasing radially along the outer tube 11. The opening width at the end closer to the outer tube 11 is smaller than that at the end farther from the outer tube 11. When the first or second fixed-position locking strip 43 is inserted into the corresponding slot, the two sidewalls of the V-shaped pointed-corner plate 42 remain stable under the constraint of the slot. When the fixed-point shuttle-shaped partition 4 is subjected to an outward pulling force in the radial direction, a self-locking effect is generated between the wedge-shaped inclined surface of the V-shaped pointed-corner plate 42 and the inner wall of the slot. The greater the force in the pulling direction, the greater the squeezing force between the wedge-shaped surface and the slot, thus making the partition tighter and tighter, effectively preventing the partition from accidentally loosening due to vibration or external force during use.

[0030] The distance between the two first wide arc plates 41 first increases and then decreases radially along the outer tube 11. The distance between the middle of the two first wide arc plates 41 is greater than the distance between any other position of the two first wide arc plates 41. A cable is fitted in the space between the two first wide arc plates 41, and the inner diameter of the first wide arc plate 41 is 1.6 to 1.8 times the diameter of the cable.

[0031] The aforementioned shuttle-shaped structure has multiple functional benefits. First, the shuttle-shaped structure narrows at both ends and widens in the middle. When the cable passes through the space between the two wide arc plates, because the space at the narrow ends is smaller than the wide center, the cable is naturally confined to the central area of ​​the space enclosed by the arc plates, preventing it from sliding towards either end. This structure itself provides axial restraint for the cable, eliminating the need for additional positioning devices. Second, the shuttle-shaped structure ensures that the cable makes line contact with the arc plates. That is, the outer wall of the cable and the inner wall of the arc plates only contact each other near the two narrow ends of the shuttle-shaped structure, while an air gap exists between the cable and the wide center area. Line contact significantly reduces the contact area compared to surface contact. This reduces the compressive strength on the cable surface, preventing damage to the cable insulation layer due to excessive local pressure. Furthermore, since most of the cable surface is exposed to the air, heat can be naturally dissipated through the air gap, improving the cable's heat dissipation. Furthermore, the inner diameter of the wide arc plate is set to 1.6 to 1.8 times the cable diameter to ensure that there is a uniform air gap between the cable and the wide arc plate in the circumferential direction. The gap is neither too large, causing the cable to sway, nor too small, causing poor heat dissipation, thus achieving the optimal balance between installation stability and heat dissipation efficiency.

[0032] A moving point partition 5 is provided between adjacent fixed-point shuttle-shaped partitions 4. The moving point partition 5 includes three types: moving point shuttle-shaped partition 51, circular wide arc plate, and straight partition 53. At least one of the above three types can be provided between adjacent fixed-point shuttle-shaped partitions 4 according to actual needs.

[0033] The movable baffle 5 is slidably connected to the slot via a movable retaining strip, allowing it to slide freely along the circumference of the outer tube 11 or the inner tube 12 within the receiving area 31. The sliding connection is achieved by the movable retaining strip having a cross-sectional shape that matches the slot's cross-sectional shape. The movable retaining strip is embedded in the slot and can slide back and forth along the slot's extension direction, but is constrained by the slot in the radial direction and cannot dislodge. This structure allows the movable baffle 5 to be pushed into the slot from any position during installation and to remain stable once in place. When adjustment is needed, simply push the movable baffle 5 to slide it along the slot to the new position. The entire installation and adjustment process requires no tools and can be completed by hand.

[0034] The moving point spindle-shaped partition 51 includes two second broad arc plates 511, which are symmetrically distributed along the axis of the outer tube 11. Each second broad arc plate 511 has a second narrow arc plate 512 connected to both ends, and each narrow arc plate 512 has a first moving retaining strip 513 connected to its end away from the second broad arc plate 511. One first moving retaining strip 513 is slidably connected to the outer groove 21, and the other first moving retaining strip 513 is slidably connected to the inner groove 22. The moving point spindle-shaped partition 51 is a spindle-shaped tube, with a cable placed in its central open area.

[0035] The shuttle-shaped structure of the moving-point shuttle-shaped partition 51 has similar limiting and heat dissipation functions to the fixed-point shuttle-shaped partition 4. The cable is confined to the open area in the middle, and there is line contact between the cable and the wide arc plate, resulting in a small contact area and good heat dissipation. The difference between the moving-point shuttle-shaped partition 51 and the fixed-point shuttle-shaped partition 4 is that the moving-point shuttle-shaped partition 51 is slidably connected to the slot through the first moving locking strip 513. Its installation position can be freely selected and adjusted at any position between adjacent fixed-point shuttle-shaped partitions 4, while the position of the fixed-point shuttle-shaped partition 4 is fixed. The moving-point shuttle-shaped partition 51 is usually used to accommodate single cables of conventional diameter. Its shuttle-shaped tube structure matches the cable diameter, achieving reliable cable limiting and good heat dissipation.

[0036] The circular wide-arc plate includes two third wide-arc plates 521, which are symmetrically distributed along the axis of the outer tube 11. Each third wide-arc plate 521 has a second movable retaining strip 522 connected to both ends. One second movable retaining strip 522 is slidably connected to the outer groove 21, and the other second movable retaining strip 522 is slidably connected to the inner groove 22. The diameter of the circular wide-arc plate is larger than the diameter of the moving point shuttle-shaped partition 51, and the projection of the circular wide-arc plate is nearly circular, making it suitable for accommodating cables with larger diameters or multiple bundled cables.

[0037] The near-circular structure of the circular wide-arc plate provides a larger internal space than the shuttle-shaped structure, enabling it to accommodate thicker cables with diameters exceeding the conventional range. When multiple smaller-diameter cables need to be bundled, the circular wide-arc plate can also accommodate them as a whole within the same space, achieving bundled management. The circular wide-arc plate is also slidably connected to the slot via the second moving clip 522, allowing for flexible adjustment of its installation position between adjacent fixed-point shuttle-shaped partitions 4.

[0038] The straight partition 53 is a flat plate structure, with locking strips at both ends that engage with the slots to divide the receiving area 31 into simple fan-shaped regions. The straight partition 53 is the simplest type of moving point partition 5 in terms of structure. Its function is to add a partition between adjacent fixed point shuttle-shaped partitions 4, further dividing the originally undivided fan-shaped region in two, thereby improving space utilization and the precision of cable separation.

[0039] In actual construction, the fixed-point shuttle-shaped partition 4 is first fixed to the outer groove 21 and inner groove 22 by fixing strips 43, forming a basic support frame. Then, according to the actual type and quantity of cables in the project, one or more of the following are selected and installed between adjacent fixed-point shuttle-shaped partitions 4: moving-point shuttle-shaped partition 51, circular wide-arc plate, or straight partition 53. Finally, the cables are threaded into the corresponding partition spaces to complete the cable laying.

[0040] The application of the present invention will be further illustrated below through specific embodiments.

[0041] Conventional cable laying: An MPP cable protection conduit with an outer diameter of 200mm is selected, and the inner tube 12 has an outer diameter of 80mm. Six fixed-point shuttle-shaped partitions 4 are equidistantly arranged along the circumference of the receiving area 31, dividing the receiving area 31 into six equal-area sector regions. A movable-point shuttle-shaped partition 51 is installed in each of the six regions between adjacent fixed-point shuttle-shaped partitions 4 to accommodate and limit a single cable. The six cables are respectively threaded into the open central area of ​​the six movable-point shuttle-shaped partitions 51, with each movable-point shuttle-shaped partition 51 limiting one cable. Because there is line contact between the cable and the wide arc plate with sufficient air gap, the heat generated during cable operation can be effectively dissipated to the receiving area 31 and the heat dissipation space of the inner tube 12, ensuring the safe operation of the cable.

[0042] Cable laying with mixed thickness: A power engineering project in an industrial zone requires the simultaneous laying of three thick cables and four thin cables. Protective conduits of the same specifications as those used for conventional cable laying are employed, along with six fixed-point shuttle-shaped partitions 4. A circular, wide-arc plate is installed between the three adjacent fixed-point shuttle-shaped partitions 4 where the thick cables are to be placed, to accommodate them. Moving-point shuttle-shaped partitions 51 are installed in the four areas where the thin cables are to be placed, to accommodate individual thin cables. The thick and thin cables are separated within different partitions, preventing interference. The large space of the circular, wide-arc plate ensures ample allowance for the installation and heat dissipation of the thick cables.

[0043] Cable laying with reserved space for future expansion: Currently, only four cables need to be laid, but future expansion may be required. Six fixed-point shuttle-shaped partitions 4 are installed, and moving-point shuttle-shaped partitions 51 are installed in four areas to thread the cables. The remaining two areas are reserved as spare space, without any moving-point partitions 5. When additional cables are needed in the future, only the corresponding moving-point partitions 5 need to be installed in the spare areas, and the new cables can be threaded through. This eliminates the need to replace the entire protective conduit or re-excavate, facilitating future expansion of the project.

Claims

1. An MPP cable protection pipe, characterized in that, The system includes an outer tube (11), an inner tube (12) at the center of the outer tube (11), a receiving area (31) between the outer tube (11) and the inner tube (12), and a number of fixed-point spindle-shaped partitions (4) are equidistantly arranged in the circumferential direction in the receiving area (31). One end of the fixed-point spindle-shaped partition (4) is fixedly connected to the inner wall of the outer tube (11), and the other end of the fixed-point spindle-shaped partition (4) is fixedly connected to the outer wall of the inner tube (12). The fixed-point spindle-shaped partition (4) is a spindle-shaped tube with pointed ends and a wide middle. The fixed-point spindle-shaped partition (4) is used to limit the cable in the middle area of ​​the receiving area (31). A moving-point partition (5) is arranged between adjacent fixed-point spindle-shaped partitions (4). The moving-point partition (5) is used to match different types of cables and isolate them.

2. The MPP cable protection pipe according to claim 1, characterized in that, Each of the fixed-point spindle-shaped partitions (4) includes: two first broad arc plates (41), the two first broad arc plates (41) are symmetrically distributed along the axis of the outer tube (11), and both ends of the two first broad arc plates (41) are connected to first narrow arc plates (421). Two first narrow arc plates (421) are provided at the ends of the two first broad arc plates (41) near the inner wall of the outer tube (11), and the two first narrow arc plates (421) form a first pointed plate (42). Two first narrow arc plates (421) are also provided at the ends of the two first broad arc plates (41) away from the inner wall of the outer tube (11). 21), the two first narrow arc plates (421) form a second pointed plate (42). One end of the first pointed plate (42) is fixedly connected to a first fixed strip (43), and one end of the second pointed plate (42) is fixedly connected to a second fixed strip (43). The inner wall of the outer tube (11) is provided with an outer groove (21) at equal intervals in the circumferential direction. The outer wall of the inner tube (12) is provided with a plurality of inner grooves (22) at equal intervals in the circumferential direction. The first fixed strip (43) is fixedly engaged with the outer groove (21), and the second fixed strip (43) is fixedly engaged with the inner groove (22).

3. The MPP cable protection pipe according to claim 2, characterized in that, The first pointed plate (42) and the second pointed plate (42) are both V-shaped plates. The opening width of the first pointed plate (42) and the second pointed plate (42) gradually increases along the radial direction of the outer tube (11). The opening width of the first pointed plate (42) and the second pointed plate (42) near the outer tube (11) is smaller than the opening width of the end away from the outer tube (11).

4. The MPP cable protection pipe according to claim 2, characterized in that, The distance between the two first wide arc plates (41) increases first and then decreases along the radial direction of the outer tube (11). The distance between the middle of the two first wide arc plates (41) is greater than the distance between any other position of the two first wide arc plates (41). A cable is adapted to be installed in the space between the two first wide arc plates (41). The inner diameter of the first wide arc plate (41) is 1.6 to 1.8 times the diameter of the cable.

5. The MPP cable protection pipe according to claim 1, characterized in that, The moving point partition (5) includes a moving point spindle-shaped partition (51), a circular wide arc plate and a straight partition (53). The moving point spindle-shaped partition (51), the circular wide arc plate and the straight partition (53) are all arranged in the receiving area (31). At least one of the moving point spindle-shaped partition (51), the circular wide arc plate and the straight partition (53) is arranged between adjacent fixed point spindle-shaped partitions (4).

6. The MPP cable protection pipe according to claim 5, characterized in that, The moving point spindle-shaped partition (51) includes: two second wide arc plates (511), which are symmetrically distributed along the axis of the outer tube (11). Each second wide arc plate (511) is connected to two ends of a second narrow arc plate (512). Each second narrow arc plate (512) is connected to a first moving clip (513) at one end away from the second wide arc plate (511). One first moving clip (513) is slidably connected to the outer groove (21), and the other first moving clip (513) is slidably connected to the inner groove (22). The moving point spindle-shaped partition (51) is a spindle-shaped tube, and a cable is placed in the open area in the middle of the moving point spindle-shaped partition (51).

7. The MPP cable protection pipe according to claim 5, characterized in that, The circular wide arc plate includes two third wide arc plates (521), which are symmetrically distributed along the axis of the outer tube (11). Each third wide arc plate (521) has a second moving clip (522) connected to both ends. One second moving clip (522) is slidably connected to the outer groove (21), and the other second moving clip (522) is slidably connected to the inner groove (22).

8. An MPP cable protection pipe according to claim 7, characterized in that, The diameter of the circular wide arc plate is larger than the diameter of the moving point shuttle-shaped partition (51). The projection of the circular wide arc plate is nearly circular, and the projection of the moving point shuttle-shaped partition (51) is shuttle-shaped.

9. An MPP cable protection pipe according to claim 1, characterized in that, The outer tube (11) and the inner tube (12) are coaxially arranged. The outer tube (11), the inner tube (12), the fixed-point shuttle-shaped partition (4) and the moving-point partition (5) are all made of modified polypropylene material.

10. An MPP cable protection pipe according to claim 1, characterized in that, The number of fixed-point shuttle-shaped partitions (4) is 4 to 8, and the number of outer grooves (21) and inner grooves (22) is the same as the number of fixed-point shuttle-shaped partitions (4) and they are set in a one-to-one correspondence.

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