Low-voltage cable with reinforcing structure

Abstract

The utility model relates to a low-voltage cable with a reinforcing structure, which comprises an inner support bundle, a filler, a rubber layer, a shielding layer, a flame retardant layer, a wear-resistant layer and a protective sleeve which are sequentially arranged from inside to outside, the inner support bundle is composed of a central sleeve and six edge sleeves surrounding the periphery of the central sleeve, conductors are arranged in the central sleeve and the edge sleeves, and the center sleeve and the edge sleeves are sleeved with the rubber layer. According to the technical scheme, the center sleeve is in a hexagonal prism shape, the peripheral face of each edge sleeve is provided with a first axial straight face connected with the center sleeve, two second axial straight faces connected with the two sides of the first axial straight face and an arc face connected between the two second axial straight faces, and the second axial straight faces of the two adjacent edge sleeves are connected. The arc faces of the side sleeves are evenly distributed around the radial direction of the center sleeve, a plurality of axial grooves are evenly formed in the peripheral face of the filler, a plurality of circumferential grooves are evenly formed in the peripheral face of the filler, and hooping rings are arranged in the circumferential grooves. The service life is further prolonged, the production difficulty is reduced, and therefore the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable structures, in particular to a low-voltage cable with a reinforced structure. Background Art

[0002] In power transmission equipment, low-voltage cables are indispensable. They are generally composed of conductors, insulation layers and protective layers, and are used to transmit electrical energy from power sources to various electrical devices.

[0003] CN 221327409 U discloses a low-voltage cable with a reinforced structure, comprising a conductor, an insulating layer fixedly installed on the outer surface of the conductor, the conductor is arranged through the center of a loose tube, a cable core filler is arranged on the outer side of the loose tube, a deformation cavity is arranged in the cable core filler on the outer side of the loose tube, a rubber layer is arranged on the outer side of the cable core filler, a shielding layer is arranged on the outer side of the rubber layer, a flame retardant layer is arranged on the outer side of the shielding layer, a wear-resistant layer is arranged on the outer side of the flame retardant layer, and a protective cover is arranged on the outer side of the wear-resistant layer. The low-voltage cable is intended to increase the structural strength through the loose tube so that the conductor is not easy to be broken, and the rubber layer and the large deformation cavity and the small deformation cavity are arranged to improve the flexibility of the cable. However, the following problems still exist: 1. Multiple loose tubes are prismatic and support each other to increase the structural strength. However, when the edges of the outer surface of the loose tube are subjected to external pressure, they will form indentations on the cable core filler, causing greater damage to the cable core filler after a long time; 2. The deformation cavity in the cable core filler can theoretically increase the flexibility of the cable, but it is not easy to shape and is difficult to manufacture. Utility Model Content

[0004] The purpose of the utility model is to provide a low-voltage cable with a reinforced structure that is reasonable in structure and reliable in use to solve the above-mentioned problems, further extend the service life, reduce the difficulty of production, and thus improve production efficiency.

[0005] The technical solution of the utility model is:

[0006] A low-voltage cable with a reinforced structure comprises an inner support bundle, a filler, a rubber layer, a shielding layer, a flame retardant layer, a wear-resistant layer and a protective sleeve which are arranged in sequence from the inside to the outside. The inner support bundle consists of a central sleeve and six side sleeves surrounding the outer circumference of the central sleeve. Conductors are arranged in the central sleeve and the side sleeves. The technical key points are: the central sleeve is in the shape of a hexagonal prism, the outer circumferential surface of the side sleeve is provided with a first axial straight surface connected to the central sleeve, two second axial straight surfaces connected to both sides of the first axial straight surface, and an arc surface connected between the two second axial straight surfaces, the second axial straight surfaces of two adjacent side sleeves are connected, and the arc surfaces of each side sleeve are uniformly arranged radially around the central sleeve, the outer circumferential surface of the filler is uniformly provided with a plurality of axial grooves and a plurality of circumferential grooves, and a clamping ring is provided in the circumferential groove.

[0007] In the above-mentioned low-voltage cable with a reinforced structure, an insulating layer is provided between the conductor and the inner walls of the central sleeve and the side sleeve.

[0008] The above-mentioned low-voltage cable with a reinforced structure, the axial groove includes six deep grooves evenly arranged on the outer circumferential surface of the filler and a shallow groove arranged between two adjacent deep grooves, the bottom of the deep groove points to the junction of two adjacent side sleeves, and the bottom of the shallow groove points to the middle of the arc surface of the side sleeve.

[0009] In the above-mentioned low-voltage cable with a reinforced structure, the deep groove and the shallow groove of the axial groove are respectively U-shaped grooves.

[0010] In the above-mentioned low-voltage cable with a reinforced structure, the depth of the circumferential groove is smaller than the depth of the axial groove.

[0011] The beneficial effects of the utility model are:

[0012] 1. The side sleeve utilizes the first axial straight surface to stably connect with the central sleeve, and utilizes the second axial straight surface to stably connect with the adjacent side sleeve. Then, each side sleeve and the central sleeve form a stable support to enhance the strength of the cable. At the same time, the arc surface of the side sleeve is connected with the filler, which greatly reduces the pressure loss of the filler and prolongs the service life.

[0013] 2. Compared with the deformation cavity in the prior art, the axial grooves and circumferential grooves on the surface of the filler are easy to realize and have low manufacturing difficulty. At the same time, the axial grooves on the surface of the filler and the inner wall of the rubber layer can form a deformable cavity, which plays a buffering role and increases the flexibility of the cable. In addition, the setting of the circumferential groove and the tightening ring therein limits the excessive deformation of the deformable cavity and ensures the strength of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of middle part I;

[0016] Figure 3 yes Figure 1 AA section view.

[0017] In the figure: 1. protective sleeve, 2. wear-resistant layer, 3. flame retardant layer, 4. shielding layer, 5. rubber layer, 6. filler, 7. shallow groove, 8. deep groove, 9. edge sleeve, 901. first axial straight surface, 902. second axial straight surface, 903. arc surface, 10. conductor, 11. center sleeve, 12. insulating layer, 13. clamping ring, 14. circumferential groove. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings of the specification.

[0019] like Figure 1 to Figure 3 As shown, the low-voltage cable with a reinforced structure includes an inner support bundle, a filler 6, a rubber layer 5, a shielding layer 4, a flame retardant layer 3, a wear-resistant layer 2 and a protective sleeve 1 arranged in sequence from the inside to the outside. The inner support bundle is composed of a central sleeve 11 and six side sleeves 9 surrounding the outer periphery of the central sleeve 11. Conductors 10 are arranged in the central sleeve 11 and the side sleeves 9. Insulating layers 12 are arranged between the conductor 10 and the inner walls of the central sleeve 11 and the side sleeves 9.

[0020] The central sleeve 11 is in the shape of a hexagonal prism. The outer peripheral surface of the edge sleeve 9 is provided with a first axial straight surface 901 connected to the central sleeve 11, two second axial straight surfaces 902 connected to both sides of the first axial straight surface 901, and an arc surface 903 connected between the two second axial straight surfaces 902. The second axial straight surfaces 902 of two adjacent edge sleeves 9 are connected, and the arc surfaces 903 of each edge sleeve 9 are uniformly arranged around the radial direction of the central sleeve 11.

[0021] The outer circumference of the filler 6 is evenly provided with a plurality of axial grooves and a plurality of circumferential grooves 14, wherein a clamping ring 13 is provided in the circumferential groove 14. The axial groove includes six deep grooves 8 evenly provided on the outer circumference of the filler 6 and a shallow groove 7 arranged between two adjacent deep grooves 8, wherein the bottom of the deep groove 8 points to the junction of two adjacent edge sleeves 9, and the bottom of the shallow groove 7 points to the middle of the arc surface 903 of the edge sleeve 9. The deep groove 8 and the shallow groove 7 of the axial groove are U-shaped grooves respectively. The depth of the circumferential groove 14 is less than the depth of the axial groove.

[0022] Working principle:

[0023] 1. The central sleeve 11 and the six side sleeves 9 are stably supported together by the first axial straight surface 901 and the second axial straight surface 902 to enhance the strength of the cable. The arc surface 903 of the side sleeve 9 is connected to the filler 6, which greatly reduces the pressure loss of the filler 6 and prolongs the service life.

[0024] 2. The axial groove on the surface of the filler 6 and the inner wall of the rubber layer 5 form a deformable cavity, which plays a buffering role and increases the flexibility of the cable. The circumferential groove 14 and the clamping ring 13 therein limit the excessive deformation of the deformable cavity and ensure the strength of use.

[0025] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A low-voltage cable with a reinforced structure, comprising an inner support bundle, a filler, a rubber layer, a shielding layer, a flame retardant layer, a wear-resistant layer and a protective sleeve arranged in sequence from the inside to the outside, wherein the inner support bundle is composed of a central sleeve and six side sleeves surrounding the outer periphery of the central sleeve, and conductors are arranged in the central sleeve and the side sleeves, characterized in that: The central sleeve is in the shape of a hexagonal prism, the outer circumferential surface of the side sleeve is provided with a first axial straight surface connected to the central sleeve, two second axial straight surfaces connected to both sides of the first axial straight surface, and an arc surface connected between the two second axial straight surfaces, the second axial straight surfaces of two adjacent side sleeves are connected, and the arc surfaces of each root side sleeve are uniformly arranged around the radial direction of the central sleeve, the outer circumferential surface of the filler is uniformly provided with a plurality of axial grooves and a plurality of circumferential grooves, and a clamping ring is provided in the circumferential groove; an insulating layer is provided between the conductor and the inner walls of the central sleeve and the side sleeve; the axial groove includes six deep grooves uniformly provided on the outer circumferential surface of the filler and a shallow groove arranged between two adjacent deep grooves, the bottom of the deep groove points to the junction of two adjacent side sleeves, and the bottom of the shallow groove points to the middle of the arc surface of the side sleeve; the deep groove and the shallow groove of the axial groove are U-shaped grooves respectively; the depth of the circumferential groove is less than the depth of the axial groove.

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