PSFP single-peak and double-peak polyolefin string fiber cable conduit

Abstract

The utility model provides a PSFP single and double-peak polyolefin string fiber cable conduit, and relates to the field of cable conduits. The PSFP single / double-peak polyolefin chord fiber cable conduit comprises a PE inner layer, a PE outer layer and a PSFP outer layer, wherein the PE inner layer is in a straight pipe shape; the thermoplastic chord fiber PE layer is arranged on the outer side of the PE inner layer and provided with a plurality of trough parts and crest parts which are alternately connected, the trough parts are attached to the outer surface of the PE inner layer, and the crest parts protrude outwards in the radial direction of the cable conduit; and the PE outer layer is attached to and covers the outer surface of the thermoplastic chord fiber PE layer. According to the utility model, by arranging the thermoplastic chord fiber PE layer in the shape of the corrugated pipe, the mechanical performance and the anti-fatigue performance of the corrugated cable conduit are improved, and while the excellent performance of the original corrugated cable conduit is maintained, the problems that the existing corrugated cable conduit has lower bearing capacity, easily causes material fatigue in long-term use, and is not easy to damage are solved. The durability cannot meet the requirement.

Description

Technical Field

[0001] The utility model relates to the field of cable conduits, in particular to a PSFP single- and double-modal polyolefin fiber cable conduit. Background Art

[0002] Cable conduits, also known as cable protection tubes, are pipes used to protect cables from mechanical damage, chemical corrosion, environmental factors, etc. They are widely used in construction, industry, transportation, communications and other fields to ensure the safety and reliability of cable lines. Polyolefins are a class of thermoplastics with excellent physical and chemical properties, including polyethylene (PE), polypropylene (PP), etc., which are widely used in the manufacture of cable conduits. In addition, the performance of polyolefin conduits can be improved by adding different additives to improve heat resistance, increase wear resistance, and resist UV rays.

[0003] Corrugated cable conduit is a commonly used polyolefin cable conduit with good bending performance, flexible installation method and high compression resistance.

[0004] However, existing corrugated cable ducts also have some potential disadvantages. On the one hand, compared with smooth ducts of the same size, corrugated ducts are insufficiently rigid and have lower load-bearing capacity, especially when subjected to heavy pressure or dynamic loads. On the other hand, the crests or troughs of the corrugated ducts are susceptible to repeated stress during long-term use, which may cause material fatigue, and their durability does not meet the use requirements of specific occasions. These disadvantages will limit their use in certain specific applications. Utility Model Content

[0005] In order to solve the problems in the prior art that the corrugated cable conduit has a low load-bearing capacity and that the crests or troughs of the corrugated conduit are prone to cause material fatigue during long-term use, and its durability does not meet the requirements, the utility model provides a PSFP single- and double-peak polyolefin black fiber cable conduit that can simultaneously solve the two performance defects.

[0006] The technical solution adopted by the utility model is:

[0007] PSFP single and double peak polyolefin fiber cable conduit, the tube wall contains:

[0008] PE inner layer;

[0009] A thermoplastic PE layer is disposed on the outside of the PE inner layer and has a plurality of alternately connected troughs and crests, wherein the troughs are attached to the outer surface of the PE inner layer and the crests are convex along the radial direction of the cable conduit; and

[0010] The PE outer layer is laminated and covered on the outer surface of the thermoplastic black fiber PE layer.

[0011] Furthermore, the PE inner layer is in the shape of a smooth straight tube.

[0012] Furthermore, a plurality of annular cavities are formed between the plurality of wave crests and the outer surface of the PE inner layer.

[0013] Furthermore, the cross section of the cavity is a trapezoid, and the side close to the PE inner layer is a lower bottom surface of the trapezoid.

[0014] Furthermore, the crest portion includes:

[0015] A double-peak structure with an annular groove on its outer side; and

[0016] The single peak structure has no groove on its outer side.

[0017] Furthermore, the unimodal structure and the bimodal structure are arranged alternately.

[0018] Furthermore, the cable conduit is formed by connecting a plurality of pipe sections, and a connecting device is provided at the connection between the plurality of pipe sections.

[0019] Furthermore, the connecting device at least has:

[0020] Two surrounding members are respectively sleeved on the outer sides of the trough portion on both sides of the connection;

[0021] The sealing ring is connected to the outside of the two surrounding parts and presses the wave crests on both sides of the connection.

[0022] Furthermore, the inner side of the sealing ring has an integrally formed stop structure, and the stop structure extends between adjacent wave crest portions outside the wave trough portion.

[0023] Furthermore, there are two stop structures, which are symmetrically arranged on both sides of the connection.

[0024] The beneficial effects of the utility model are:

[0025] 1. The utility model improves the mechanical properties and fatigue resistance of the corrugated cable conduit by providing a thermoplastic black fiber PE layer in the shape of a corrugated tube. While retaining the excellent performance of the original corrugated cable conduit, it solves the problem in the prior art that the corrugated cable conduit has a low load-bearing capacity and the crests or troughs of the corrugated conduit are prone to material fatigue during long-term use, and its durability does not meet the requirements.

[0026] 2. The utility model also provides a straight tube-shaped PE inner layer and a PE outer layer covering the thermoplastic black fiber PE layer, thereby better protecting the thermoplastic black fiber PE layer as the main body of the cable duct and the cable lines running inside, thereby improving the safety and durability of the cable duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The figure is a cross-sectional schematic diagram of a cable conduit according to an embodiment of the utility model.

[0029] Figure 2 For this utility model Figure 1 Enlarged view of point A in the middle.

[0030] Figure 3 It is a cross-sectional schematic diagram of the connecting device in the embodiment of the utility model.

[0031] Figure 4 For this utility model Figure 1 Enlarged view of point B in the middle.

[0032] Reference numerals:

[0033] 100-PE outer layer;

[0034] 200-thermoplastic black fiber PE layer, 201-cavity, 220-trough, 240-peak, 242-single peak structure, 244-double peak structure, 249-groove;

[0035] 300-PE inner layer;

[0036] 50-connecting device, 52-surrounding member, 54-sealing ring, 56-retaining structure. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0039] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0040] In one or more embodiments, it should be pointed out that the so-called thermoplastic PE layer refers to a pipe wall layer made of thermoplastic polyolefin material reinforced with basalt fiber; the so-called PE outer layer and PE inner layer are both pipe wall layers made of polyolefin material; the so-called inner side refers to the side close to the axial direction of the cable conduit; the so-called outer side refers to the side away from the axial direction of the cable conduit.

[0041] See also Figure 1-2 The first embodiment provides a PSFP single-mode and bimodal polyolefin black fiber cable conduit, the characteristics of which are mainly reflected in its wall structure, and its wall comprises: a PE outer layer 100, a thermoplastic black fiber PE layer 200 and a PE inner layer 300, etc.

[0042] like Figure 1 , Figure 2 As shown in the figure, the PE inner layer 300 is in a smooth straight tube shape and is arranged as the inner side wall of the innermost layer of this embodiment, thereby reducing the collision and friction between the inner wall and the cable conductor during the installation of the cable conduit and reducing mutual wear. At the same time, the PE inner layer 300 adopts a general polyolefin material without adding basalt fiber reinforcement. General polyolefin is an excellent electrical insulation material, which can prevent the cable line in the cable conduit from leaking to a certain extent, and help improve the safety performance of the cable line.

[0043] like Figure 1 , Figure 2As shown in the figure, the thermoplastic black fiber PE layer 200 is arranged on the outside of the PE inner layer 300, and a corrugated tube shape is formed by a number of alternately connected troughs 220 and crests 240. Among them, the trough 220 is attached to the outer surface of the PE inner layer 300, connected by hot melt fusion, and the crest 240 is convex along the radial direction of the cable conduit and is not connected to the outer surface of the PE inner layer 300. In this embodiment, since the PE outer layer 100 is covered on the outside of the thermoplastic black fiber PE layer 200, the corrugated tube shape of the thermoplastic black fiber PE layer 200 determines that the external shape of the cable conduit is also a corrugated tube shape. The external corrugated tube shape provides higher flexibility, can be easily bent into the desired shape, adapt to the complex wiring path of the cable line, and help absorb shock and vibration, thereby protecting the cable from mechanical stress; and the corrugated structure increases the compression resistance of the conduit, so that it can maintain its shape when subjected to external force, protecting the internal cable line from damage. In addition, compared with rigid conduits of equal strength, corrugated tubes are usually lighter and easier to transport and install. At the same time, the thermoplastic PE layer 200 is made of basalt fiber reinforced thermoplastic polyolefin material, which can significantly improve the mechanical properties of polyolefin materials, including tensile strength, compressive strength and impact strength; it can also improve the fatigue resistance of the material, making it more suitable for applications that withstand repeated loading. In this embodiment, the thermoplastic PE layer 200 serves as the thicker main part of the conduit, thereby making up for the shortcomings of the corrugated pipe in terms of load-bearing capacity and fatigue resistance.

[0044] Since the surface properties of the reinforcing material used in the thermoplastic PE layer 200, such as glossiness or color, are not good, and it is prone to chemical or physical degradation in certain environments, in this embodiment, Figure 1 , Figure 2 As shown in , by co-extrusion molding, the PE outer layer 100 is laminated and covered on the entire outer surface of the thermoplastic black fiber PE layer 200, isolating the thermoplastic black fiber PE layer 200 from the external environment. The PE outer layer 100 adopts a general polyolefin material without basalt fiber reinforcement. Compared with the thermoplastic polyolefin material reinforced with basalt fiber, the general polyolefin material not only has better surface properties, but also has high chemical stability, thereby avoiding corrosion damage to the surface of the cable conduit during long-term use. In addition, when the cable conduit is partially damaged and hot-melt repair is required, the general polyolefin material has lower thermal stability, and the PE outer layer 100, as the outermost layer, is more convenient for surface repair.

[0045] In this embodiment, the PSFP single- and double-modal polyolefin black fiber cable conduit achieves the improvement of the mechanical properties and fatigue resistance of the corrugated cable conduit by setting a thermoplastic black fiber PE layer 200 in the shape of a corrugated tube. While retaining the excellent performance of the original corrugated cable conduit, it solves the problem that the corrugated cable conduit in the prior art has a low load-bearing capacity and the crests or troughs of the corrugated conduit are prone to cause material fatigue during long-term use, and its durability does not meet the requirements.

[0046] At the same time, in this embodiment, a straight tubular PE inner layer 300 and a PE outer layer 100 covering the thermoplastic black fiber PE layer 200 are provided to better protect the thermoplastic black fiber PE layer 200 as the main body of the cable conduit and the cable lines running inside, thereby improving the safety and durability of the cable conductors.

[0047] In addition, in this embodiment, the following preferred technical solution is also adopted, thereby further solving some problems existing in the basic technical solution on the basis of solving the original technical problems.

[0048] As a first preferred mode, in this embodiment, due to the use of a three-layer composite structure of a PE outer layer 100, a thermoplastic black fiber PE layer 200, and a PE inner layer 300, and the high strength of the black fiber PE layer 200 as the main body, the PSFP single and bimodal polyolefin black fiber cable conduit of this embodiment has high strength, especially the ring stiffness is greatly improved, so the material consumption of the black fiber PE layer 200 can be reduced. Figure 1 , Figure 2 As shown in , the thickness of the crest part 240 is set to be the same as that of the trough part 220, and the crest part 240 protrudes outward and is not connected to the outer surface of the PE inner layer 300, so that a number of annular cavities 201 are formed between the inside of the crest parts 240 and the outer surface of the PE inner layer 300. By setting the cavity 201, not only the raw materials are saved and the economy of the cable conduit is improved, but also the weight of the overall structure is reduced, making the transportation and installation of the cable conduit more convenient; at the same time, the cavity structure therein can be used as an energy absorption area to disperse and absorb energy when impacted, thereby reducing damage to the pipeline system.

[0049] Furthermore, the cross section of the cavity 201 is set to be a trapezoid, and the side close to the PE inner layer 300 is the lower bottom surface of the trapezoid. Due to its large section modulus, the trapezoidal cross section can provide good bending resistance and torsion resistance, and is more suitable for structures of corrugated cable ducts that withstand large bending moments and torsional moments. At the same time, the two side surfaces of the trapezoidal cross section are inclined, so that the connection between the crest part 240 and the trough part 220 can transition more smoothly, reducing the destructive effect of external impact on the cavity structure and improving the impact resistance. In addition, compared with a circular or square cross section, a trapezoidal cavity can also reduce the use of materials while maintaining the same strength, increase the ring stiffness, and further reduce the weight of the overall structure.

[0050] As a second preferred mode, in this embodiment, the peak portion 240 is also set as a single peak structure 242 and a double peak structure 244. Among them, an annular groove 249 is set on the outer side of the double peak structure 244, while there is no annular groove 249 on the outer side of the single peak structure 242. By setting the annular groove 249, the stress concentration on the double peak structure 244 can be reduced, the ring stiffness can be increased, and the risk of fatigue cracks in the cable conduit when subjected to repeated bending or pressure can be reduced; at the same time, the groove 249 can make the cable conduit more flexible when bending, reduce the resistance during the bending process, and facilitate the laying of the conduit in a narrow space. The single peak structure 242 is not provided with a groove 249 on the outer side, which can maintain the overall strength of the cable conduit. Further, the single peak structure 242 and the double peak structure 244 are alternately arranged, that is, one of any two adjacent peaks is a single peak structure and the other is a double peak structure, so that in the cable conduit, the strength of the overall structure and the stress fatigue resistance and bending laying performance of each part are balanced, so that the cable conduit of this embodiment has better comprehensive mechanical properties and can meet the application needs in multiple scenarios.

[0051] However, in the above embodiment, the entire cable conduit only considers the technical solution of a one-section cable conduit. In actual applications, the distance of the cable conduit is sometimes long and the line is relatively complex. The PSFP single- and bimodal polyolefin black fiber cable conduit in the above embodiment needs to be divided into multiple sections for transportation. The connection between the sections is prone to misalignment, resulting in loose joints and seals, and the cable line is exposed and damaged. In order to further solve the problem in long-distance applications based on the first embodiment, a second embodiment is provided below.

[0052] See also Figure 1-4 The cable conduit in the second embodiment is formed by connecting a plurality of pipe sections, wherein a connecting device 50 is provided at the connection between the plurality of pipe sections.

[0053] The connecting device 50 is mainly used to stabilize the connection between the pipe sections to prevent the cable line from being exposed and damaged. Figure 3 , Figure 4As shown in , the connection device 50 mainly includes two surrounding members 52 and a sealing ring 54. The two surrounding members 52 are respectively sleeved on the outside of the two troughs 220 on both sides of the cable duct connection, and fix the sealing ring 54 on the outside. The sealing ring 54 is cylindrical, and its inner wall is adapted to the size of the outer wall of the cable duct. It is fixedly connected to the outside of the two surrounding members 52 and is located in two opposite radial directions. Through the fixation of the two surrounding members 52, the sealing ring 54 presses the multiple peaks 240 on both sides of the cable duct connection, so that the cable ducts on both sides of the connection are more tightly combined to prevent them from being misaligned. In this embodiment, the surrounding member 52 can adopt a common rubber ring, and the outer sealing ring 54 is tightened by its elasticity.

[0054] Furthermore, if Figure 3 As shown in the figure, in the second embodiment, an annular stop structure 56 with an inclined strip cross section is provided on the inner side wall of the sealing ring 54 contacting the crest portion 240 and at symmetrical positions on both sides of the cable conduit connection. The stop structure 56 is integrally formed with the sealing ring 54 and extends between adjacent crest portions 240 outside the trough portion 220. By providing the stop structure 56, the axial movement of the cable conduit is limited, the cable conduit is prevented from retracting, and the cable line at the connection is avoided from being exposed, further improving the safety and stability of the cable conduit of this embodiment.

[0055] In addition, in addition to the structure shown in the second embodiment, the connection device 50 is not limited to the above structure, and other structures of the cable guide suitable for this embodiment with similar functions can also be adopted.

[0056] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. PSFP single and double peak polyolefin fiber cable conduit, characterized in that: The tube wall contains: PE inner layer (300); a thermoplastic black fiber PE layer (200) disposed on the outside of the PE inner layer (300) and having a plurality of alternately connected trough portions (220) and crest portions (240), wherein the trough portions (220) are attached to the outer surface of the PE inner layer (300), and the crest portions (240) are convex outwardly along the radial direction of the cable conduit; and The PE outer layer (100) is laminated and covered on the outer surface of the thermoplastic black fiber PE layer (200).

2. The PSFP single- and double-modal polyolefin black fiber cable conduit according to claim 1, characterized in that: The PE inner layer (300) is in the shape of a smooth straight tube.

3. The PSFP single- and double-modal polyolefin black fiber cable conduit according to claim 1, characterized in that: A plurality of annular cavities (201) are formed between the plurality of wave peaks (240) and the outer surface of the PE inner layer (300).

4. The PSFP single- and bimodal polyolefin black fiber cable conduit according to claim 3, characterized in that: The cross section of the cavity (201) is a trapezoid, and the side close to the PE inner layer (300) is a trapezoidal bottom surface.

5. The PSFP unimodal and bimodal polyolefin black fiber cable conduit according to claim 1, characterized in that: The crest portion (240) comprises: A double-peak structure (244) having an annular groove (249) disposed on its outer side; and The single peak structure (242) does not have the groove (249) on its outer side.

6. The PSFP unimodal and bimodal polyolefin fiber cable conduit according to claim 5, characterized in that: The single peak structure (242) and the double peak structure (244) are arranged alternately.

7. The PSFP unimodal and bimodal polyolefin fiber cable conduit according to any one of claims 1 to 6, characterized in that: The cable conduit is formed by connecting a plurality of pipe sections, and a connecting device (50) is provided at the connection between the plurality of pipe sections.

8. The PSFP unimodal and bimodal polyolefin fiber cable conduit according to claim 7, characterized in that: The connecting device (50) at least comprises: Two surrounding members (52) are respectively sleeved on the outside of the trough portion (220) on both sides of the connection; The sealing ring (54) is connected to the outside of the two surrounding members (52) and simultaneously presses the wave crests (240) on both sides of the connection.

9. The PSFP unimodal and bimodal polyolefin fiber cable conduit according to claim 8, characterized in that: The inner side of the sealing ring (54) has an integrally formed stop structure (56), and the stop structure (56) extends between adjacent wave crest portions (240) outside the wave trough portion (220).

10. The PSFP unimodal and bimodal polyolefin fiber cable conduit according to claim 9, characterized in that: There are two stop structures (56), which are symmetrically arranged on both sides of the connection.

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