Low-temperature butyronitrile power cable

Abstract

The utility model belongs to the technical field of power cables, in particular to a low-temperature butyronitrile power cable, which comprises an inner core made of nitrile rubber and wrapping a plurality of leads, wrapping strips and hemp ropes, the whole wrapping strips are wrapped outside the leads with the same thickness, the wrapping strips are circumferentially distributed, and the hemp ropes are wound around the inner core. The protective layers are combined outside all the wires in a side surface clinging manner and form an annular closed protective layer; firstly, through the cooperation of the embedding grooves and the hemp ropes and the adoption of the filling strips formed through extrusion molding, it is ensured that the embedding length of the hemp ropes is close to the production length of the cable, waste is avoided, the production efficiency is improved to a certain extent through the embedding assembly mode, and secondly, through the design of the through holes in the inner core and the buffer grooves in the outer sides of the filling strips, material use is reduced, and cost is reduced. And finally, the inner core and the wrapping strips are formed by extruding nitrile rubber, so that the distribution of the wrapping strips is optimized, the wires are uniformly wrapped, and the low-temperature-resistant performance can be uniformly and fully exerted.

Description

Technical Field

[0001] This utility model belongs to the field of power cable technology, and in particular relates to a low-temperature nitrile butadiene power cable. Background Technology

[0002] Low-temperature nitrile butadiene rubber (NBR) power cables are cables with excellent low-temperature resistance and good electrical properties. NBR rubber is typically a synthetic rubber with strong resistance to oil, water, chemicals, and low temperatures, thus maintaining good mechanical and insulation properties even in low-temperature environments.

[0003] In a typical cable, there are several conductors arranged circumferentially, which are eccentrically distributed with respect to the cable. However, nitrile rubber wraps all the conductors at the same time to form a protective layer concentric with the cable. This results in the outer layer of the protective layer between two adjacent conductors being thicker than the other parts. The nitrile rubber is not evenly wrapped around the conductors on the outside, so the temperature resistance effect cannot be fully utilized.

[0004] Secondly, the hemp rope used for tensile strength is generally integrated into the cable by extrusion and wrapping. Although this method can ensure the effectiveness of the hemp rope in the cable, the hemp rope cannot be laid continuously in a straight line, and there are curved sections, which results in the waste of hemp rope. It also cannot increase the cable strength. In addition, this processing method is relatively complicated and requires high fit and precision.

[0005] To address the aforementioned issues, this application proposes a low-temperature nitrile butadiene power cable. Utility Model Content

[0006] The purpose of this invention is to provide a low-temperature nitrile butadiene power cable, which solves the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model relates to a low-temperature nitrile butadiene power cable, comprising an inner core and a wrapping strip made of nitrile butadiene rubber that encloses several conductors, and hemp rope. The wrapping strip is wrapped around the outside of the conductors with the same thickness. The wrapping strip consists of multiple circumferentially distributed strips, which are combined in a side-to-side manner to form a closed annular protective layer outside all conductors. Several hemp ropes are formed in the cable in a circumferentially distributed manner in an interlocking manner. A filler strip is tightly attached to the outside of the wrapping strip, and the hemp rope is disposed in the filler strip.

[0009] Furthermore, the outer ring surface of the filler strip has symmetrically distributed fitting grooves, and the hemp rope is fitted into the filler strip through the fitting grooves. The filler strip consists of several circumferentially distributed strips, and the sides of adjacent filler strips are in close contact with each other, forming a closed loop on the outside of all the wrapping strips.

[0010] Furthermore, the outer side of the closed-loop filler strip is spirally wound with an armor layer, and the outer side of the armor layer is covered with an outer sheath.

[0011] Furthermore, the outer surface of the inner core is provided with a first arc-shaped groove that is the same number as and matches the number of wires, and the inner side of the wrapping strip is formed with a second arc-shaped groove that matches the outer surface of the wires. The first arc-shaped groove and the second arc-shaped groove form a wrap around the outer surface of the wires.

[0012] Furthermore, the inner core has a through hole, and the outer middle of the filler strip has a buffer groove.

[0013] Furthermore, the connection point between the sides of two adjacent wrapping strips is located between two adjacent conductors, and the part of the inner side of the wrapping strip that does not wrap the conductor is in close contact with the outer arc surface of the conductor.

[0014] Furthermore, the cross-section of the fitting groove is U-shaped.

[0015] This utility model has the following beneficial effects:

[0016] This utility model, by setting a fitting groove and cooperating with hemp rope, and the filling strip is formed by extrusion, ensures that the fitting groove is formed with the shortest length, and the embedded length of the hemp rope can be closer to the cable production length. This ensures the cable strength while avoiding hemp rope waste. Moreover, the production requirements of the hemp rope by embedding are lower, which improves the cable production efficiency to a certain extent. At the same time, the through hole formed inside the core and the buffer groove formed outside the filling strip can reduce the material while making the cable more flexible and reducing the impact of low temperature on the cable flexibility.

[0017] The inner core and wrapping strip of this invention are both formed by extrusion of nitrile rubber. Without increasing the amount of material used, the uneven parts of the traditional method are evenly distributed to form the wrapping strip. The wrapping strip can evenly wrap the corresponding wires on the inner side, thereby making the low temperature resistance effect uniform and fully exerted.

[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0021] Figure 2 for Figure 1 Top view of the structure;

[0022] Figure 3 This is a schematic diagram of the cable cross-section;

[0023] Figure 4 This is a magnified schematic diagram of a portion of the inner core.

[0024] Figure 5 This is a magnified schematic diagram of a portion of the packaging strip.

[0025] Figure 6 This is a magnified schematic diagram of the filler strip.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] In the diagram: 1. Inner core; 11. First arc groove; 12. Through hole; 2. Wire; 3. Wrapping strip; 31. Second arc groove; 4. Filler strip; 41. Fitting groove; 42. Buffer groove; 5. Hemp rope; 6. Armor layer; 7. Outer sheath. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Please see Figure 1-6 As shown, this utility model is a low-temperature nitrile butadiene power cable, including an inner core 1 made of nitrile butadiene rubber that wraps around several conductors 2 and a wrapping strip 3, and also includes hemp rope 5. The wrapping strip 3 is wrapped around the outside of the conductors 2 with the same thickness. The wrapping strip 3 consists of multiple circumferentially distributed strips, which are combined in a side-attached manner to the outside of all conductors 2 to form a closed annular protective layer. Several hemp ropes 5 are formed in the cable in an interlocking manner and in a circumferentially distributed manner. A filler strip 4 is tightly attached to the outside of the wrapping strip 3, and the hemp rope 5 is disposed in the filler strip 4.

[0031] The outer ring surface of the filler strip 4 has symmetrically distributed fitting grooves 41. The hemp rope 5 is fitted into the filler strip 4 through the fitting grooves 41. The filler strip 4 consists of several circumferentially distributed strips, and the sides of adjacent filler strips 4 are closely attached to each other and form a closed loop on the outside of all wrapping strips 3. In this embodiment, the wrapping strips are wrapped around the outside of the conductor with the same thickness to form a tight annular protective layer, ensuring uniform low-temperature resistance. By embedding the hemp rope into the filler strip, the overall protection performance of the cable is further enhanced, avoiding external damage.

[0032] The closed-loop filler strip 4 is spirally wound with an armor layer 6, and the armor layer 6 is covered with an outer sheath 7. In this embodiment, the armor layer 6 and the outer sheath 7 provide strong physical protection to prevent the cable from being subjected to external impact or physical damage during use, thereby improving the cable's durability.

[0033] The inner core 1 has a first arc-shaped groove 11 on its outer side that is the same number as and matches the number of conductors 2. The inner side of the wrapping strip 3 has a second arc-shaped groove 31 that matches the outer side of the conductors 2. The first arc-shaped groove 11 and the second arc-shaped groove 31 wrap around the conductors 2. In this embodiment, the inner core 1 and the wrapping strip 3 fully wrap the conductors 2 and provide support for them inside the cable, thus protecting the conductors 2.

[0034] The inner core 1 has a through hole 12 and the outer middle of the filler strip 4 has a buffer groove 42. In this embodiment, the through hole 12 and the buffer groove 42 reduce the material while improving the cable flexibility, reducing the impact of low temperature environment on electrothermal flexibility, and improving the cable's impact resistance under external pressure or vibration, reducing cable damage or decreased conductivity caused by external impact.

[0035] In this embodiment, the connection between the sides of two adjacent wrapping strips 3 is located between two adjacent conductors 2. The part of the inner side of the wrapping strip 3 that does not wrap the conductor 2 is tightly attached to the outer arc surface of the conductor 2. In this embodiment, the conductor 2 and the wrapping strip 3 can be tightly attached to each other. After the outer armor layer 6 and outer sheath 7 are formed, the overall internal structure of the cable is reliable and stable.

[0036] The fitting groove 41 has a U-shaped cross section. In this embodiment, the U-shape allows the hemp rope 5 to be easily embedded in the fitting groove 41, and then the positioning is formed by the hemp rope 5 on the outside, which has the advantage of easy docking.

[0037] Understandably, firstly, by using the interlocking groove and hemp rope in conjunction with the extruded filler strip, the embedded length of the hemp rope is ensured to be close to the cable production length, avoiding waste. Moreover, the interlocking assembly method improves production efficiency to a certain extent. Secondly, the through holes inside the inner core and the buffer groove design on the outside of the filler strip not only reduce material usage but also enhance the cable's flexibility and reduce the impact of low temperature. Finally, both the inner core and the wrapping strip are made of nitrile rubber extrusion molding, which optimizes the distribution of the wrapping strip and evenly wraps the conductor, thereby allowing the low temperature resistance performance to be uniformly and fully utilized.

[0038] One specific application of this embodiment is that the inner core 1, the wrapping strip 3, and the filler strip 4 are all extruded and then assembled together by bonding. This method greatly facilitates the assembly and forming of cables.

[0039] According to the appendix Figure 1-2 As shown, the conductor 2 is attached to the first arc groove 11 along this path and in this manner, the second arc groove 31 is attached to the outside of the conductor 2, the filler strip 4 is attached to the outside of the wrapping strip 3, the hemp rope 5 is embedded in the embedding groove 41, the armor layer 6 is spirally wrapped around the outside of the semi-finished product composed of the above, and finally the outer sheath 7 is wrapped around the outside of the armor layer 6 to form the final finished cable.

[0040] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A low-temperature nitrile butadiene rubber power cable, comprising an inner core (1) made of nitrile butadiene rubber and enclosing a plurality of conductors (2) and a wrapping strip (3), and further comprising hemp rope (5), characterized in that: The wrapping strip (3) is wrapped around the outside of the conductor (2) with the same thickness. The wrapping strip (3) consists of multiple strips distributed around the circumference and are combined in a way that is tightly attached to the sides of all conductors (2) to form a closed annular protective layer. Several hemp ropes (5) are formed in the cable in a way that is embedded and distributed around the circumference. The wrapping strip (3) is tightly attached to the outside of the filler strip (4), and the hemp rope (5) is set in the filler strip (4).

2. The low-temperature nitrile butadiene power cable according to claim 1, characterized in that: The outer ring surface of the filling strip (4) is provided with symmetrically distributed fitting grooves (41), and the hemp rope (5) is fitted into the filling strip (4) through the fitting grooves (41). The filling strip (4) consists of several circumferentially distributed strips, and the sides of adjacent filling strips (4) are closely attached to each other and form a closed loop on the outside of all wrapping strips (3).

3. A low-temperature nitrile butadiene power cable according to claim 2, characterized in that: The closed-loop filler strip (4) is spirally wound with an armor layer (6), and the armor layer (6) is covered with an outer sheath (7).

4. The low-temperature nitrile butadiene power cable according to claim 1, characterized in that: The inner core (1) has a first arc-shaped groove (11) on its outside that is the same number as and matches the wire (2). The inner side of the wrapping strip (3) has a second arc-shaped groove (31) that matches the outside of the wire (2). The first arc-shaped groove (11) and the second arc-shaped groove (31) wrap around the outside of the wire (2).

5. A low-temperature nitrile butadiene power cable according to claim 1, characterized in that: The inner core (1) has a through hole (12), and the filling strip (4) has a buffer groove (42) in the middle of its outer side.

6. A low-temperature nitrile butadiene power cable according to claim 1, characterized in that: The connection point of two adjacent wrapping strips (3) is located between two adjacent wires (2), and the part of the wrapping strip (3) that does not wrap the wire (2) is close to the outer arc surface of the wire (2).

7. A low-temperature nitrile butadiene power cable according to claim 2, characterized in that: The cross-section of the fitting groove (41) is U-shaped.

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