Environment-friendly medium-voltage non-crosslinking modified polypropylene insulated power cable
By employing a special structural design of non-crosslinked modified polypropylene insulated power cable in medium-voltage cables, the problems of conductor breakage and slippage in complex usage scenarios are solved, thereby improving the service life of the cables.
Patent Information
- Application Number
- CN202323662585.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2033-12-29
AI Technical Summary
Existing medium-voltage power cables are prone to conductor breakage, insulation damage, and slippage under conditions such as dragging, bending, and compression, which affects their service life.
The design adopts an environmentally friendly medium-voltage non-crosslinked modified polypropylene insulated power cable, which includes a non-crosslinked modified polypropylene insulation layer on the outside of the conductor, a winding layer, an inner protective layer, and an outer protective layer. The winding layer forms a spiral gap, the spiral protrusion on the outside of the inner protective layer fits tightly with the winding layer, and the protrusion on the inside of the outer protective layer increases the structural strength.
It improves the cable's resistance to bending and tension, prevents conductor breakage and protective layer slippage, and extends its service life.
Smart Images
Figure CN222319790U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of modified polypropylene insulated power cables, in particular to an environmentally friendly medium-voltage non-cross-linked modified polypropylene insulated power cable. Background Art
[0002] Most plastic insulated cables are mainly insulated with cross-linked polyethylene (XLPE), but XLPE cannot be recycled, resulting in resource waste and environmental pollution. Non-cross-linked modified polypropylene (PP) is the most promising material for replacing XLPE insulation due to its excellent insulation and heat resistance. It has been used in medium and high voltage transmission cables. Some high-performance non-cross-linked polypropylene (PP) can also be used in ultra-high voltage power cables.
[0003] Medium-voltage power cables are used in complex scenarios and are often dragged, bent, and squeezed, which can easily lead to internal wire breakage, external insulation damage, and relative slippage between insulation layers, affecting the service life of medium-voltage power cables. Summary of the invention
[0004] The purpose of the utility model is to provide an environmentally friendly medium-voltage non-cross-linked modified polypropylene insulated power cable, which has good bending and tensile resistance and can prevent slippage between two adjacent protective layers during repeated dragging, thereby extending the service life of the utility model.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide an environmentally friendly medium-voltage non-cross-linked modified polypropylene insulated power cable, including a conductor, a non-cross-linked modified polypropylene insulation layer is arranged on the outside of the conductor, a winding layer is arranged on the outside of the non-cross-linked modified polypropylene insulation layer, a spiral gap is formed between two adjacent turns of the winding layer, an inner protective layer is arranged on the outside of the winding layer, a spiral track is arranged on the outside of the inner protective layer, the spiral track forms a second inner spiral protrusion on the inner side of the inner protective layer, the second inner spiral protrusion is located inside the spiral gap, an outer protective layer is arranged on the outside of the inner protective layer, and a first inner spiral protrusion corresponding to the spiral track is arranged on the inside of the outer protective layer.
[0006] Optionally, a wear-resistant protective layer is arranged on the outer side of the outer protective layer, and the wear-resistant protective layer is fixedly connected to the outer protective layer by environmentally friendly glue.
[0007] Optionally, the wear-resistant protective layer is a wear-resistant braided sheath.
[0008] Optionally, the outer protective layer is formed by an EPDM rubber material through an extrusion process.
[0009] Optionally, the inner protective layer is a sheet-like semi-conductive polypropylene insulating shielding material formed by a coating process.
[0010] Optionally, the winding layer is a strip-shaped semi-conductive polypropylene insulating shielding layer formed by spiral winding.
[0011] Optionally, the cross-sectional shape of the first inner spiral protrusion is semicircular.
[0012] Optionally, the conductive wire is formed by spirally winding multiple copper wires.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] The utility model forms a spiral gap by arranging a winding layer, and an inner protective layer is coated on the outer side thereof. The inner protective layer has a second inner spiral protrusion, which can be closely matched with the winding layer, and an outer protective layer is arranged on the outer side of the inner protective layer, and a first inner spiral protrusion is formed on the inner side of the outer protective layer. When the utility model is bent, the first inner spiral protrusion is squeezed, and the elasticity of the first inner spiral protrusion when being squeezed prevents the utility model from bending at a small angle, thereby preventing the wire from being broken, and the outer protective layer and the inner protective layer are closely matched to prevent the two from relative slippage, and the overall thickness of the first inner spiral protrusion is increased by arranging the first inner spiral protrusion, which is not easy to break, thereby improving the performance and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model from a first viewing angle;
[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the winding layer of the utility model;
[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the inner protective layer of the utility model;
[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the outer protective layer of the utility model.
[0020] In the figure: 1, wear-resistant protective layer; 2, outer protective layer; 201, first inner spiral protrusion; 3, inner protective layer; 301, spiral path; 302, second inner spiral protrusion; 4, winding layer; 401, spiral gap; 5, non-cross-linked modified polypropylene insulation layer; 6, conductor. DETAILED DESCRIPTION
[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0025] The environmentally friendly medium-voltage non-cross-linked modified polypropylene insulated power cable provided by the embodiment of the utility model is now described. An environmentally friendly medium-voltage non-cross-linked modified polypropylene insulated power cable comprises a conductor 6, the conductor 6 is formed by spirally winding a single strand or multiple strands of copper wire, a non-cross-linked modified polypropylene insulation layer 5 is arranged on the outside of the conductor 6, a winding layer 4 is arranged on the outside of the non-cross-linked modified polypropylene insulation layer 5, a spiral gap 401 is formed between two adjacent windings of the winding layer 4, an inner protective layer 3 is arranged on the outside of the winding layer 4, a spiral track 301 is arranged on the outside of the inner protective layer 3, the spiral track 301 forms a second inner spiral protrusion 302 on the inner side of the inner protective layer 3, and the second inner spiral protrusion 302 is located inside the spiral gap 401, an outer protective layer 2 is arranged on the outside of the inner protective layer 3, and a first inner spiral protrusion 201 corresponding to the spiral track 301 is arranged on the inner side of the outer protective layer 2.
[0026] The utility model provides an environment-friendly medium-voltage non-cross-linked modified polypropylene insulated power cable. Compared with the prior art, a winding layer 4 is provided to form a spiral gap 401, an inner protective layer 3 is coated on the outer side thereof, the inner protective layer 3 has a second inner spiral protrusion 302, which can be closely matched with the winding layer 4, and an outer protective layer 2 is provided on the outer side of the inner protective layer 3, and a first inner spiral protrusion 201 is formed on the inner side of the outer protective layer 2. When the utility model is bent, the first inner spiral protrusion 201 is squeezed, and the elasticity of the first inner spiral protrusion 201 when being squeezed prevents the utility model from bending at a small angle, thereby preventing the conductor 6 from being broken, and the outer protective layer 2 and the inner protective layer 3 are closely matched to prevent relative slippage between the two, and the overall thickness is increased by providing the first inner spiral protrusion 201, which is not easy to break, thereby improving the use performance and extending the service life.
[0027] In another embodiment of the present invention, please refer to Figure 1 A wear-resistant protective layer 1 is arranged on the outside of the outer protective layer 2. The wear-resistant protective layer 1 and the outer protective layer 2 are fixedly connected by environmentally friendly glue, so that the wear-resistant protective layer 1 and the outer protective layer 2 are connected more tightly, and the wear-resistant protective layer 1 is used to protect the outer protective layer 2, playing the role of the outermost layer of protection.
[0028] In another embodiment of the present invention, please refer to Figure 1 The wear-resistant protective layer 1 is a wear-resistant braided sheath, and the braided sheath is used to protect the outer protective layer 2.
[0029] In another embodiment of the present invention, refer to Figure 4 The outer protective layer 2 is made of EPDM rubber material and is formed by an extrusion process, and the first inner spiral protrusion 201 inside is naturally formed in close contact with the inner protective layer 3.
[0030] In another embodiment of the present invention, please refer to Figure 3 The inner protective layer 3 is a sheet-like semi-conductive polypropylene insulating shielding material formed by a coating process.
[0031] In another embodiment of the present invention, please refer to Figure 2 The winding layer 4 is a strip-shaped semi-conductive polypropylene insulating shielding layer formed by spiral winding.
[0032] In another embodiment of the present invention, refer to Figure 4 The cross-sectional shape of the first inner spiral protrusion 201 is semicircular.
[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable, comprising a conductor (6), characterized in that: The outer side of the conductor (6) is provided with a non-cross-linked modified polypropylene insulation layer (5), the outer side of the non-cross-linked modified polypropylene insulation layer (5) is provided with a winding layer (4), a spiral gap (401) is formed between two adjacent turns of the winding layer (4), the outer side of the winding layer (4) is provided with an inner protective layer (3), the outer side of the inner protective layer (3) is provided with a spiral track (301), the spiral track (301) forms a second inner spiral protrusion (302) on the inner side of the inner protective layer (3), the second inner spiral protrusion (302) is located inside the spiral gap (401), the outer side of the inner protective layer (3) is provided with an outer protective layer (2), and the inner side of the outer protective layer (2) is provided with a first inner spiral protrusion (201) corresponding to the spiral track (301).
2. The environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable according to claim 1, characterized in that: A wear-resistant protective layer (1) is arranged on the outer side of the outer protective layer (2), and the wear-resistant protective layer (1) and the outer protective layer (2) are fixedly connected by environmentally friendly glue.
3. The environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable according to claim 2, characterized in that: The wear-resistant protective layer (1) is a wear-resistant braided sheath.
4. The environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable according to claim 1, characterized in that: The outer protective layer (2) is made of ethylene propylene rubber material formed by an extrusion process.
5. The environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable according to claim 1, characterized in that: The inner protective layer (3) is a sheet-like semi-conductive polypropylene insulating shielding material formed by a coating process.
6. The environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable according to claim 1, characterized in that: The winding layer (4) is a strip-shaped semi-conductive polypropylene insulating shielding layer formed by spiral winding.
7. The environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable according to claim 1, characterized in that: The cross-sectional shape of the first inner spiral protrusion (201) is semicircular.
8. The environmentally friendly medium voltage non-cross-linked modified polypropylene insulated power cable according to claim 1, characterized in that: The conductor (6) is formed by spirally winding a plurality of copper wires.