Bending-resistant flexible power cable

Abstract

The utility model provides a bending-resistant flexible power cable, which comprises a flexible cable, a corrugated pipe and a spring, the corrugated pipe is sleeved outside the flexible cable, the spring is arranged in the corrugated pipe, and the spring is positioned between the corrugated pipe and the flexible cable; the corrugated pipe is of a spiral fold type structure, the spring is of a spiral structure, and the spring abuts against the inner wall of the corrugated pipe. According to the bending-resistant flexible power cable, the bending-resistant performance, the reset performance after bending and the like of the corrugated pipe can be improved, and then the service life of the flexible power cable is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable structure technical field especially is related to a kind of flexible power cable of bending resistance. BACKGROUND

[0002] Flexible power cable is a kind of commonly used cable, which is widely used in power transmission, data transmission, communication control and other scenes. The commonly used flexible power cable generally includes an outer protective layer (i.e. an armored layer) and a plurality of core wires arranged in the outer protective layer. In some application scenarios (for example, outdoor application scenarios), in order to improve the waterproof and dustproof, weather resistance and other properties of the flexible power cable, a corrugated pipe is usually provided on the outer sleeve of the flexible power cable to protect the flexible power cable (for details, please refer to CN222338948U and other patents).

[0003] The flexible power cable often needs to be bent, folded, twisted and the like during installation, use and the like. Since the corrugated pipe is usually made of plastic material, when the flexible power cable is repeatedly bent, the corrugated pipe is prone to breakage, cracking and other problems after being folded and cannot be reset, thereby affecting the service life of the flexible power cable. SUMMARY

[0004] The utility model aims to provide a kind of flexible power cable of bending resistance, which can improve the bending resistance of corrugated pipe, reset performance after bending and the like, and thereby improve the service life of the flexible power cable.

[0005] The utility model provides a kind of flexible power cable of bending resistance, including flexible cable, corrugated pipe and spring, the corrugated pipe is set on the outer sleeve of the flexible cable, the spring is arranged in the corrugated pipe, and the spring is located between the corrugated pipe and the flexible cable;The corrugated pipe is spiral pleated structure, the spring is spiral structure, and the spring and the inner wall of the corrugated pipe are in abutment.

[0006] In an implementable manner, the side wall of the corrugated pipe protrudes radially outward to form an outer fold, and the outer fold is a spiral structure;A groove is formed on the inner wall of the corrugated pipe corresponding to the position of the outer fold, the spring is clamped in the groove, and the spring and the inner wall of the groove are in abutment.

[0007] In an implementable manner, the corrugated pipe is made of elastic material, and the diameter of the spring is greater than or equal to the inner diameter of the outer fold.

[0008] In an implementable manner, the pitch of the spring is equal to the pitch of the outer fold, and the total number of turns of the spring is equal to the total number of turns of the outer fold.

[0009] In an implementable mode, the pitch of the spring and the pitch of the outer fold are both 5mm-20mm.

[0010] In an implementable mode, the part of the side wall of the bellows that does not protrude radially outward is formed with an inner fold, and the inner fold is a spiral structure; the outer wall of the flexible cable abuts against the inner wall of the inner fold.

[0011] In an implementable mode, the spring is formed by winding a metal wire, and the diameter of the metal wire is 0.8mm-2mm.

[0012] In an implementable mode, at least one end of the bellows is provided with a connecting part; the connecting part comprises an adapter pipe and a mounting member, one end of the adapter pipe is connected to the end of the bellows; the mounting member comprises a sleeve pipe, the sleeve pipe and the adapter pipe are both sleeved on the outside of the flexible cable, and the sleeve pipe is detachably connected to the adapter pipe.

[0013] The sleeve pipe is used for being inserted into a through hole on the shell of the electrical equipment; a flange part is protruded on the outer wall of the sleeve pipe, and the flange part is used for abutting against the outer wall of the shell and being fixed to the shell.

[0014] In an implementable mode, the sleeve pipe comprises a first pipe segment and a second pipe segment that are integrally connected; the first pipe segment is sleeved with the adapter pipe, and the first pipe segment is detachably connected to the adapter pipe; the second pipe segment is located on the side of the first pipe segment that is away from the adapter pipe, and the second pipe segment is used for being inserted into the through hole on the shell; and the flange part is located between the first pipe segment and the second pipe segment.

[0015] In an implementable mode, the mounting member further comprises a fastening nut, the outer wall of the second pipe segment is provided with an external thread, and the fastening nut is threadedly connected to the second pipe segment; the fastening nut is used for cooperating with the flange part to clamp the shell between the fastening nut and the flange part.

[0016] The flexible power cable provided by the utility model has the advantages that the bellows is sleeved on the outside of the flexible cable, the bellows can protect the flexible cable, and the waterproof and dustproof performance and weather resistance of the flexible cable are improved; and in addition, the bellows has good flexibility and bending resistance, so that the bending of the flexible cable is not affected.

[0017] Meanwhile, by arranging the spring in the bellows, the bellows is of a spiral fold structure, the spring is of a spiral structure, the spring abuts against the inner wall of the bellows, so that the spring can be profiled with the bellows and support the bellows, that is, the spring is equivalent to the framework of the bellows, thereby improving the structural strength, toughness and the like of the bellows, that is, improving the bending resistance, the reset performance after bending and the like of the bellows, and further improving the service life of the flexible power cable. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a perspective view of a flexible power cable according to an embodiment of the present application.

[0019] Figure 2 FIG. 2 is a partial cross-sectional view of the flexible power cable according to the embodiment of the present application. Figure 1

[0020] Figure 3 FIG. 4 is a perspective view of a spring according to the embodiment of the present application.

[0021] Figure 4 FIG. 5 is an assembly structure view of a mounting member and a housing according to the embodiment of the present application. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0023] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

[0024] The terms "up", "down", "left", "right", "front", "back", "top", "bottom" and the like (if any) in the description and claims of the present application are defined by the position of the structure in the drawing and the position of the structure relative to each other, only to express the technical solution clearly and conveniently. It should be understood that the use of the terms should not limit the scope of the present application.

[0025] As shown in FIG. 1, the present application provides a flexible power cable with bending resistance, which comprises a flexible cable 1, a bellows 2 and a spring 5. Figures 1 to 3 The flexible cable 1 comprises an insulating layer (not shown in the drawing; the insulating layer is generally made of rubber) and a core wire (not shown in the drawing; the core wire serves as a conductor) arranged in the insulating layer.

[0026] ​The corrugated pipe 2 is sleeved on the flexible cable 1, and the spring 5 is arranged in the corrugated pipe 2 and located between the corrugated pipe 2 and the flexible cable 1; the corrugated pipe 2 has a spiral fold structure, and the spring 5 has a spiral structure and abuts against the inner wall of the corrugated pipe 2.

[0027] The flexible power cable provided by the embodiment of the utility model has the corrugated pipe 2 sleeved on the flexible cable 1, the corrugated pipe 2 can protect the flexible cable 1, and the waterproof and dustproof performance and weather resistance of the flexible cable 1 are improved; moreover, the corrugated pipe 2 has good flexibility and bending resistance, so that the bending of the flexible cable 1 is not affected.

[0028] Meanwhile, the spring 5 is arranged in the corrugated pipe 2, the corrugated pipe 2 has a spiral fold structure, the spring 5 has a spiral structure, and the spring 5 abuts against the inner wall of the corrugated pipe 2, so that the spring 5 can be shaped with the corrugated pipe 2 and support the corrugated pipe 2, that is, the spring 5 is equivalent to the framework of the corrugated pipe 2, so that the structural strength and flexibility of the corrugated pipe 2 are improved, that is, the bending resistance and reset performance (that is, after the corrugated pipe 2 is bent and deflated, the corrugated pipe 2 can be quickly reset under the radial elastic force of the spring 5, so that the corrugated pipe 2 cannot be reset after being bent and deflated) of the corrugated pipe 2 are improved, and the service life of the flexible power cable is further improved.

[0029] As shown in FIGS. Figure 1 and Figure 2 As an embodiment, the side wall of the corrugated pipe 2 is outwardly convex along the radial direction to form an outer fold 21, and the outer fold 21 has a spiral structure; the inner wall of the corrugated pipe 2 is formed with a groove 22 at a position corresponding to the outer fold 21, the groove 22 has a spiral structure, the spring 5 is clamped in the groove 22, and the spring 5 abuts against the inner wall of the groove 22. The pitch of the spring 5 is equal to the pitch of the outer fold 21, and the total number of turns of the spring 5 is equal to the total number of turns of the outer fold 21. In this way, the spring 5 is shaped with the corrugated pipe 2, so that the spring 5 can better support the corrugated pipe 2 and avoid axial deviation between the spring 5 and the corrugated pipe 2.

[0030] As an embodiment, the pitch of the spring 5 and the pitch of the outer fold 21 are both 5mm-20mm. Preferably, the pitch of the spring 5 and the pitch of the outer fold 21 are both 5mm-15mm.

[0031] As an implementation, the bellows 2 is made of elastic material (such as polyethylene, polypropylene, or other plastic material), and the diameter of the spring 5 is greater than (slightly greater than) or equal to the inner diameter of the outer fold 21, so that the spring 5 can better abut the inner wall of the bellows 2 to better support the bellows 2 (since the bellows 2 is made of elastic material, when the diameter of the spring 5 is slightly greater than the inner diameter of the outer fold 21, the bellows 2 will slightly deform in the radial direction under the radial extrusion of the spring 5, so that the spring 5 is tightly fitted with the inner wall of the bellows 2).

[0032] As an implementation, the spring 5 is formed by winding a metal wire, and the diameter of the metal wire is 0.8mm-2mm (i.e. the wire diameter of the spring 5 is 0.8mm-2mm); wherein the metal wire is generally a steel wire. Preferably, the diameter of the metal wire is 1mm-1.5mm. In this way, the spring 5 has good bendability and structural strength (if the metal wire is too thick, the spring 5 is not easy to bend, thereby affecting the bendability of the flexible power cable; if the metal wire is too thin, the structural strength of the spring 5 is weak and cannot provide sufficient support force for the bellows 2).

[0033] As shown in Figure 1 and Figure 2 As an implementation, the side wall of the bellows 2 does not form an inner fold 23 at the part that does not protrude outward in the radial direction (i.e. the part of the bellows 2 other than the outer fold 21 is the inner fold 23, i.e. the bellows 2 is composed of the outer fold 21 and the inner fold 23), and the inner fold 23 has a spiral structure; the outer wall of the flexible cable 1 abuts the inner wall of the inner fold 23, so that the flexible cable 1 can also support the bellows 2.

[0034] As shown in Figures 1 to 4 As an implementation, the bend-resistant flexible power cable can be connected with the shell 6 of an electrical device, and the shell 6 is provided with a through hole 61; the electrical device can be an electrical box or the like (generally an electrical device with a shell or a box). At least one end of the bellows 2 is provided with a connecting part M; the connecting part M includes an adapter tube 3 and a mounting part 4, one end of the adapter tube 3 is connected with the end of the bellows 2; the mounting part 4 includes a sleeve 41, the sleeve 41 and the adapter tube 3 are both sleeved on the flexible cable 1, and the end of the flexible cable 1 extends out of the sleeve 41, and the sleeve 41 is detachably connected with the adapter tube 3. The sleeve 41 is used for being inserted into the through hole 61 of the shell 6 of the electrical device; a flange part 42 is protruded on the outer wall of the sleeve 41 (i.e. the flange part 42 is formed by protruding the outer wall of the sleeve 41 outward in the radial direction), and the flange part 42 has a disc-shaped structure, and the flange part 42 is used for abutting and fixing with the outer wall of the shell 6.

[0035] Specifically, by arranging the connecting portion M at the end of the bellows 2, during installation, only the sleeve 41 needs to be inserted into the through hole 61 on the shell 6, the flange portion 42 is abutted against the outer wall of the shell 6, and the flange portion 42 is fixed to the shell 6, so that the sealing connection between the mounting member 4 and the shell 6 of the electrical equipment can be achieved. This mounting structure not only facilitates the connection between the bellows 2 and the shell 6 of the electrical equipment, but also ensures the sealing between the bellows 2 and the flexible cable 1 and between the bellows 2 and the shell 6 of the electrical equipment, thereby ensuring the sealing of the shell 6 of the electrical equipment (since the flange portion 42 is abutted against the outer wall of the shell 6, the external water vapor, dust, etc. cannot enter the shell 6 through the gap between the sleeve 41 and the inner wall of the through hole 61).

[0036] Meanwhile, since the sleeve 41 is detachably connected to the adapter pipe 3, not only the disassembly and replacement of the mounting member 4 are facilitated, but also different types of mounting members 4 can be replaced according to different use scenarios, so as to meet the installation requirements of different electrical equipment and improve the versatility of the flexible power cable.

[0037] As shown in Figure 1 and Figure 2 , as an embodiment, the adapter pipe 3 is integrally connected with the bellows 2, i.e. the adapter pipe 3 and the bellows 2 are an integral structure (the adapter pipe 3 and the bellows 2 can be integrally formed by injection molding). The inner wall and the outer wall of the adapter pipe 3 are flat structures (i.e. the adapter pipe 3 is a smooth tubular structure), i.e. the adapter pipe 3 is not a corrugated structure like the bellows 2, so as to facilitate the assembly and connection of the sleeve 41 and the adapter pipe 3.

[0038] As shown in Figure 1 , as an embodiment, the bellows 2 is provided with the connecting portion M at each of the opposite ends, so that the two ends of the bellows 2 can be connected to the electrical equipment through the connecting portion M. Of course, in other embodiments, the connecting portion M can be arranged at only one end of the bellows 2.

[0039] As shown in Figure 1 and Figure 2 , as an embodiment, the sleeve 41 and the bellows 2 are both circular tubes, and the difference between the inner diameter of the sleeve 41 and the inner diameter of the inner fold 23 is not more than 3 mm, i.e. the inner diameter of the sleeve 41 is close to the inner diameter of the bellows 2. In this way, since the outer diameter of the flexible cable 1 is close to the inner diameter of the bellows 2, the inner diameter of the sleeve 41 is also close to the outer diameter of the flexible cable 1, so that the sleeve 41 and the flexible cable 1 can be tightly matched, and the connection stability between the sleeve 41 and the flexible cable 1 is improved (the sleeve 41 can be prevented from moving relative to the flexible cable 1).

[0040] As shown in Figures 1 to 4As shown, in one embodiment, the sleeve 41 includes an integrally connected first pipe section 411 and second pipe section 412, with the same inner diameter of the first pipe section 411 and the second pipe section 412. The first pipe section 411 is sleeved with the adapter pipe 3, and the first pipe section 411 and the adapter pipe 3 are detachably connected; the second pipe section 412 is located on the side of the first pipe section 411 away from the adapter pipe 3, and the second pipe section 412 is used to be inserted into the through hole 61 on the housing 6; the flange portion 42 is located between the first pipe section 411 and the second pipe section 412. The mounting component 4 also includes a clamp 43, which is sleeved on the outside of the first pipe section 411 and the adapter pipe 3, and the first pipe section 411 and the adapter pipe 3 are fixed by the clamp 43.

[0041] Specifically, in this embodiment, the adapter pipe 3 is sleeved outside the first pipe section 411, and the clamp 43 is sleeved outside the adapter pipe 3. When assembling the sleeve 41 and the adapter pipe 3, simply connect the first pipe section 411 to the adapter pipe 3 first, and then use the clamp 43 to secure the first pipe section 411 and the adapter pipe 3 together. In another embodiment, the first pipe section 411 and the adapter pipe 3 can also be connected by threads. For example, an external thread can be provided on the outer wall of the first pipe section 411, and an internal thread can be provided on the inner wall of the adapter pipe 3. The external thread and the internal thread are screwed together to achieve a threaded connection between the first pipe section 411 and the adapter pipe 3. Of course, in other embodiments, the first pipe section 411 and the adapter pipe 3 can also be detachably connected in other ways.

[0042] like Figures 1 to 4 As shown, in one embodiment, the mounting component 4 also includes a fastening nut 44. The outer wall of the second pipe section 412 is provided with an external thread 410, and the fastening nut 44 is threadedly connected to the second pipe section 412 (the inner wall of the fastening nut 44 is provided with an internal thread). The fastening nut 44 is used to cooperate with the flange portion 42 to clamp the housing 6 between the fastening nut 44 and the flange portion 42.

[0043] Specifically, the fastening nut 44 and the sleeve 41 are preferably made of insulating material (the sleeve 41 and the fastening nut 44 can be made of polyethylene, polypropylene, etc.) to ensure the insulation between the mounting part 4 and the housing 6. During installation, simply assemble the sleeve 41 and the adapter pipe 3 first, then insert the end of the flexible cable 1 and the second pipe section 412 of the sleeve 41 together into the through hole 61 on the housing 6 (that is, the end of the flexible cable 1 and the second pipe section 412 of the sleeve 41 extend into the housing 6), and make the flange part 42 abut against the outer wall of the housing 6. Then screw the fastening nut 44 onto the second pipe section 412, and make the housing 6 tightly clamped between the fastening nut 44 and the flange part 42, so that the fastening nut 44 and the flange part 42 are fixed to the housing 6, thus fixing the mounting part 4 to the housing 6.

[0044] As another implementation manner, the flange portion 42 is fixed with the shell 6 through screws (not shown in the figure). Specifically, the flange portion 42 is provided with a first screw hole (not shown in the figure), the shell 6 is provided with a second screw hole (not shown in the figure), the inner walls of the first screw hole and the second screw hole are provided with threads, and the first screw hole and the second screw hole are used for fixing the flange portion 42 with the shell 6 through screws. During installation, only the sleeve 41 and the adapter pipe 3 need to be assembled first, then the end of the flexible cable 1 and the second pipe segment 412 of the sleeve 41 are inserted into the through hole 61 of the shell 6 together, the flange portion 42 is abutted with the outer wall of the shell 6, and then the flange portion 42 and the shell 6 are fixed through screws, so that the mounting piece 4 is fixed with the shell 6.

[0045] As another implementation manner, a sealing layer (not shown in the figure) is clamped between the first pipe segment 411 and the adapter pipe 3, so as to further improve the sealing between the first pipe segment 411 and the adapter pipe 3, and avoid the external water vapor, dust and the like from entering between the flexible cable 1 and the bellows 2. The sealing layer can be a raw material belt, a sealing ring, a sealing rubber layer and the like.

[0046] As another implementation manner, the second pipe segment 412 is sleeved with a sealing gasket (not shown in the figure), and the sealing gasket is used for being clamped between the flange portion 42 and the outer wall of the shell 6, so as to further improve the sealing between the flange portion 42 and the shell 6, and avoid the external water vapor, dust and the like from entering the shell 6 through the gap between the sleeve 41 and the inner wall of the through hole 61.

[0047] The above is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A bend-resistant, flexible power cable, characterized by, The flexible cable (1), the bellows (2) and the spring (5) are included, the bellows (2) is sleeved on the flexible cable (1), the spring (5) is arranged in the bellows (2), and the spring (5) is located between the bellows (2) and the flexible cable (1); the bellows (2) is a spiral fold structure, the spring (5) is a spiral structure, and the spring (5) abuts against the inner wall of the bellows (2).

2. The bend resistant, flexible power cable of claim 1, wherein, The side wall of the bellows (2) is outwardly convex in the radial direction to form an outer fold (21), and the outer fold (21) is a spiral structure; a groove (22) is formed on the inner wall of the bellows (2) corresponding to the position of the outer fold (21), the spring (5) is clamped in the groove (22), and the spring (5) abuts against the inner wall of the groove (22).

3. The bend resistant, flexible power cable of claim 2, wherein, The bellows (2) is made of elastic material, and the diameter of the spring (5) is greater than or equal to the inner diameter of the outer fold (21).

4. The bend resistant, flexible power cable of claim 2, wherein, The pitch of the spring (5) is equal to the pitch of the outer fold (21), and the total number of turns of the spring (5) is equal to the total number of turns of the outer fold (21).

5. The bend resistant, flexible power cable of claim 4, wherein, The pitch of the spring (5) and the pitch of the outer fold (21) are both 5mm-20mm.

6. The bend resistant, flexible power cable of claim 2, wherein, The side wall of the bellows (2) is not outwardly convex in the radial direction to form an inner fold (23), and the inner fold (23) is a spiral structure; the outer wall of the flexible cable (1) abuts against the inner wall of the inner fold (23).

7. The bend resistant, flexible power cable of claim 1, wherein, The spring (5) is formed by bending a metal wire, and the diameter of the metal wire is 0.8mm-2mm.

8. The bend-tolerant flexible power cable of any one of claims 1-7, wherein, At least one end of the bellows (2) is provided with a connecting portion (M); the connecting portion (M) includes an adapter pipe (3) and a mounting piece (4), one end of the adapter pipe (3) is connected with the end of the bellows (2); the mounting piece (4) includes a sleeve pipe (41), the sleeve pipe (41) and the adapter pipe (3) are both sleeved on the flexible cable (1), and the sleeve pipe (41) is detachably connected with the adapter pipe (3); The sleeve pipe (41) is used for being inserted into a through hole (61) on a shell (6) of an electrical equipment; a flange portion (42) is protruded on the outer wall of the sleeve pipe (41), and the flange portion (42) is used for abutting against the outer wall of the shell (6) and being fixed with the shell (6).

9. The bend resistant, flexible power cable of claim 8, wherein, The sleeve pipe (41) includes a first pipe segment (411) and a second pipe segment (412) which are integrally connected, the first pipe segment (411) is sleeved with the adapter pipe (3), and the first pipe segment (411) is detachably connected with the adapter pipe (3); the second pipe segment (412) is located on the side, away from the adapter pipe (3), of the first pipe segment (411), and is used for being inserted into the through hole (61) on the shell (6); and the flange portion (42) is located between the first pipe segment (411) and the second pipe segment (412).

10. The bend resistant, flexible power cable of claim 9, wherein, The mounting piece (4) further comprises a fastening nut (44), an outer wall of the second pipe section (412) is provided with an outer thread (410), and the fastening nut (44) is threadedly connected with the second pipe section (412); the fastening nut (44) is used in cooperation with the flange part (42) to clamp the shell (6) between the fastening nut (44) and the flange part (42).

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