A low temperature resistant cable structure and preparation method thereof

Abstract

The invention discloses a low-temperature resistant cable structure, comprising a conductor at the center and an outer sheath at the outermost layer, wherein an electric heating wire is arranged on the inner wall of the outer sheath; the electric heating wire is in a spiral shape; the number of the electric heating wires is an even number, wherein two electric heating wires with diameters larger than the remaining electric heating wires serve as busbars, the two busbars are adjacent, and the busbars are connected to an external power supply through a temperature control switch to form a loop. The low-temperature resistant cable is provided with an electric heating wire, which can withstand low temperatures and effectively delay the aging and embrittlement of the outer sheath of the rubber material under low-temperature working conditions. The electric heating wire is controlled by a temperature control switch arranged outside the cable, and can automatically operate according to the ambient temperature, so as to save electric energy when the temperature is high. An even number of electric heating wires are spirally arranged on the inner wall of the outer sheath of the cable, forming a mesh contact surface with the outer sheath, and evenly transferring heat to the outer sheath, so as to avoid problems such as accelerated aging, catalysis, and cracking of the outer sheath due to low temperature, and effectively prolong the service life of the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to a low-temperature resistant cable structure and a preparation method thereof. Background Art

[0002] In northern and western my country, low temperatures last for a long time, with a large temperature difference between morning and evening, especially in winter, when the outdoor temperature in some areas can reach around -50°C. When ordinary cables are laid or operated under such conditions, the cable insulation and sheath will crack, which is not conducive to the transmission of cable power, reduces the service life of the cable, and also poses a safety hazard. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects, provide a low-temperature resistant cable structure and a preparation method thereof, effectively delay the aging and embrittlement of the outer sheath of the rubber material, and effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-temperature resistant cable structure, comprising a conductor at the center and an outer sheath at the outermost layer, wherein a heating wire is arranged on the inner wall of the outer sheath; the heating wire is spiral-shaped; the number of the heating wires is an even number, wherein two heating wires have diameters larger than the other heating wires and serve as busbars, the two busbars are adjacent, and the busbars are connected to an external power supply through a temperature control switch to form a loop.

[0005] As a preferred technical solution of the present invention, the conductor is coated with an inner tape, a shielding layer, an outer tape and an outer sheath in sequence, the heating wire is spirally wound on the outer tape, and the outer sheath completely covers the heating wire.

[0006] As a preferred technical solution of the present invention, the conductor is coated with an inner tape, a shielding layer, an outer tape, an inner sheath, an armor layer, and an outer sheath in sequence. The heating wire is spirally wound on the armor layer, and the outer sheath completely covers the heating wire.

[0007] As a preferred technical solution of the present invention, the conductor is coated with an insulating layer

[0008] The preparation method of the low temperature resistant cable comprises the following steps:

[0009] Step 1: Drawing

[0010] Under the action of external force, the metal is forced through the die, the metal cross-sectional area is compressed, and the required cross-sectional area shape and size are obtained to obtain the conductor;

[0011] Step 2: Twisting

[0012] Two or more conductors are interwoven together in a specified direction to form the cable core;

[0013] Step 3: Tie it tight

[0014] Wrap the inner core of the conductor with a paper tape, mica tape, alkali-free glass fiber tape, non-woven fabric or plastic tape and tie it tightly to form an inner sheath;

[0015] Step 4: Vertical Packing

[0016] Wrap the strip copper sheet longitudinally around the inner cladding to form a shielding layer;

[0017] Step 5: Isolation

[0018] Wrapping the shielding layer with a strip of paper tape, mica tape, alkali-free glass fiber tape, non-woven fabric or plastic tape to form an outer layer that plays an isolating role;

[0019] Step 6: Embed

[0020] Binding the end of the heating wire to the end of the semi-finished cable with the outer sheath so that the heating wire is wrapped around the outer sheath;

[0021] Step 7: Squeeze the bag

[0022] The hot-melt rubber is extruded and coated on the outside of the outer sheath, so that it completely covers the outer sheath and the heating wire to form an outer sheath. At this point, a complete low-temperature resistant cable is obtained.

[0023] As a preferred technical solution of the present invention, in step six, before wrapping the heating wire, hot-melt rubber is first extruded outside the outer sheath to form an inner sheath, and a steel belt is wrapped outside the inner sheath to form an armor layer, and the heating wire is wrapped outside the armor layer.

[0024] As a preferred technical solution of the present invention, in step six, when wrapping the heating wire, a guide ring is provided, and guide holes are arranged on the guide ring. The number of guide holes is consistent with the number of heating wires to be wrapped and are arranged at equal angles. After the heating wire passes through the guide holes, it is wrapped on the outer sheath.

[0025] Compared with the prior art, the invention has the following beneficial effects: the low-temperature resistant cable is provided with a heating wire, which can withstand low temperatures and effectively delay the aging and embrittlement of the outer sheath of the rubber material under low-temperature working conditions; the heating wire is controlled by a temperature control switch arranged outside the cable, and can automatically operate according to the ambient temperature, saving electric energy when the temperature is high; an even number of heating wires are spirally arranged on the inner wall of the outer sheath of the cable to form a mesh contact surface with the outer sheath, uniformly transferring heat to the outer sheath, avoiding problems such as accelerated aging, catalysis, and cracking of the outer sheath due to low temperatures, and effectively extending the service life of the cable;

[0026] The preparation method of the low-temperature resistant cable is also relatively simple, and any cable production line with a wrapping process can produce it, which greatly reduces the investment in production equipment and ensures the production efficiency of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure without armor of the present invention;

[0028] Figure 2 This is a schematic diagram of the non-armored cross-section structure of the present invention;

[0029] Figure 3 It is a schematic diagram of the armored cross-section structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the working state of the guide ring of the present invention;

[0031] Figure 5 It is a schematic diagram of the heating wire forming a loop of the present invention.

[0032] In the figure: 1 conductor, 2 inner sheath, 3 shielding layer, 4 outer sheath, 5 outer sheath, 6 heating wire, 7 guide ring, 8 armor layer, 9 inner sheath. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-5 The present invention provides a technical solution: a low-temperature resistant cable structure, comprising a conductor 1 at the center and an outer sheath 5 at the outermost layer, the conductor 1 is coated with an insulating layer to improve the insulation effect of the cable, the conductor 1 is coated with an inner tape 2, a shielding layer 3, an outer tape 4, and an outer sheath 5 in sequence, the heating wire 6 is spirally wound on the outer tape 4, and the outer sheath 5 completely covers the heating wire 6, and an inner sheath 9 and an armor layer 8 can also be added between the outer tape 4 and the outer sheath 5, and the heating wire 6 is spirally wound on the armor layer 8 to obtain an armored low-temperature resistant cable;

[0035] In the above two cable structures, the heating wire 6 is in contact with the inner wall of the outer sheath 5;

[0036] The heating wire 6 is spiral-shaped, and the number of the heating wires 6 is an even number. Two of the heating wires 6 have a diameter larger than that of the other heating wires 6 and serve as busbars. The two busbars are adjacent to each other. The busbars are connected to an external power supply through a temperature control switch to form a loop, and can automatically operate according to the ambient temperature. The heating wire 6 and the outer sheath 5 form a mesh contact surface, which evenly transfers heat to the outer sheath, avoiding problems such as accelerated aging, catalysis, and cracking of the outer sheath due to low temperature, thereby effectively extending the service life of the cable.

[0037] The preparation method of the low temperature resistant cable comprises the following steps:

[0038] Step 1: Drawing

[0039] Under the action of external force, the metal is forced to pass through the die, the cross-sectional area of ​​the metal is compressed, and the required cross-sectional area shape and size are obtained to obtain the conductor 1;

[0040] Step 2: Twisting

[0041] Two or more conductors 1 are interwoven together in a specified direction to form a cable core;

[0042] Step 3: Tie it tight

[0043] A paper tape, mica tape, alkali-free glass fiber tape, non-woven fabric or plastic tape is wrapped around the inner core of the conductor 1 and tied tightly to form an inner cladding 2;

[0044] Step 4: Vertical Packing

[0045] Wrap the strip copper sheet longitudinally outside the inner cladding 2 to form a shielding layer 3;

[0046] Step 5: Isolation

[0047] A paper tape, mica tape, alkali-free glass fiber tape, non-woven fabric or plastic tape is wrapped around the shielding layer 3 to form an outer covering layer 4 that plays an isolating role;

[0048] Step 6: Embed

[0049] Bind the end of the heating wire 6 to the end of the semi-finished cable with the outer sheath 4, so that the heating wire 6 is wrapped around the outer sheath 4;

[0050] Before wrapping the heating wire 6, firstly, hot-melt rubber is extruded outside the outer sheath 4 to form an inner sheath 9, and a steel tape is wrapped outside the inner sheath 9 to form an armor layer 8, and the heating wire 6 is wrapped outside the armor layer 8 to make an armored low-temperature resistant cable;

[0051] When wrapping the heating wire 6, a guide ring 7 is provided, and guide holes are arranged on the guide ring 7. The number of the guide holes is consistent with the number of the heating wires 6 to be wrapped and arranged at equal angles. The heating wire 6 passes through the guide holes and is wrapped on the outer sheath 4, so that the pitch of the wrapped heating wire 6 is uniform, so that the outer sheath 5 is heated more evenly.

[0052] Step 7: Squeeze the bag

[0053] Extruding hot-melt rubber to coat the outside of the outer sheath 4, so that it completely covers the outer sheath 4 and the heating wire 6, forming an outer sheath 5, so that a complete low-temperature resistant cable is obtained;

[0054] The low-temperature resistant cable usually needs to be cut off when in use. How to connect an even number of heating wires 6 into a loop is a difficulty in the technical solution. After continuous attempts, the solution is as follows: During production, two thicker heating wires 6 are selected as marked busbars for connecting to the temperature control switch and the power supply. The busbars are adjacent when wrapped, and the remaining adjacent heating wires 6 are staggered to form a loop. Taking 6 heating wires 6 as an example, the specific connection method is as follows Figure 5 shown.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low temperature resistant cable structure, comprising a conductor (1) at the center and an outer sheath (5) at the outermost layer, characterized in that: The inner wall of the outer sheath (5) is provided with a heating wire (6); The heating wire (6) is in a spiral shape; The number of the heating wires (6) is an even number, wherein two heating wires (6) have a diameter larger than that of the remaining heating wires (6) and serve as busbars. The two busbars are adjacent to each other, and the busbars are connected to an external power source via a temperature control switch to form a loop.

2. A low temperature resistant cable structure according to claim 1, characterized in that: The conductor (1) is coated with an inner wrapping tape (2), a shielding layer (3), an outer wrapping tape (4), and an outer sheath (5) in sequence; the heating wire (6) is spirally wound around the outer wrapping tape (4); and the outer sheath (5) completely covers the heating wire (6).

3. A low temperature resistant cable structure according to claim 1, characterized in that: The conductor (1) is coated with an inner wrapping tape (2), a shielding layer (3), an outer wrapping tape (4), an inner sheath (9), an armor layer (8), and an outer sheath (5) in sequence; the heating wire (6) is spirally wound around the armor layer (8), and the outer sheath (5) completely covers the heating wire (6).

4. A low temperature resistant cable structure according to claim 2 or 3, characterized in that: The conductor (1) is coated with an insulating layer.

5. A method for preparing a low-temperature resistant cable, characterized in that: The following steps are involved: Step 1: Drawing Under the action of external force, the metal is forced through the die, the cross-sectional area of ​​the metal is compressed, and the required cross-sectional area shape and size are obtained to obtain a conductor (1); Step 2: Twisting Two or more conductors (1) are interwoven together in a specified direction to form a cable core; Step 3: Tie it tight A paper tape, a mica tape, an alkali-free glass fiber tape, a non-woven fabric or a plastic tape is wrapped around the inner core of the conductor (1) and tied tightly to form an inner cladding (2); Step 4: Vertical Packing Wrapping the strip copper sheet longitudinally outside the inner cladding (2) to form a shielding layer (3); Step 5: Isolation A paper tape, a mica tape, an alkali-free glass fiber tape, a non-woven fabric or a plastic tape is wrapped around the shielding layer (3) to form an outer covering layer (4) that plays an isolating role; Step 6: Embed The end of the heating wire (6) is bound to the end of a semi-finished cable having an outer sheath (4), so that the heating wire (6) is wrapped around the outside of the outer sheath (4); Step 7: Squeeze the bag The hot-melt rubber is extruded and coated on the outside of the outer sheath (4) so ​​as to completely cover the outer sheath (4) and the heating wire (6) to form an outer sheath (5). Thus, a complete low-temperature resistant cable is obtained.

6. The method for preparing a low-temperature resistant cable structure according to claim 5, characterized in that: In the step six, before wrapping the heating wire (6), firstly, hot-melt rubber is extruded outside the outer sheath (4) to form an inner sheath (9), and a steel strip is wrapped outside the inner sheath (9) to form an armor layer (8), and the heating wire (6) is wrapped outside the armor layer (8).

7. The method for preparing a low-temperature resistant cable structure according to claim 5, characterized in that: In the step six, when wrapping the electric heating wire (6), a guide ring (7) is provided, and guide holes are arranged on the guide ring (7). The number of the guide holes is consistent with the number of the electric heating wires (6) to be wrapped and are arranged at equal angles. The electric heating wire (6) passes through the guide holes and is wrapped on the outer sheath (4).

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