Novel copper core sheath mineral insulated cable

Abstract

The utility model discloses a novel copper core sheath mineral insulated cable, relates to the technical field of cables, and provides the following scheme aiming at the problems that an internal sheath and a copper core are easy to damage and the practicability is low when the cable is subjected to external pressure due to the fact that a buffer structure is not arranged in the cable in the background technology. Comprising a mineral insulation outer layer and a plurality of copper cores, sheaths are arranged outside the plurality of copper cores, mica tapes are arranged outside the plurality of sheaths, insulation inner layers are arranged outside the plurality of mica tapes, a retaining ring is arranged in the mineral insulation outer layer, a ventilation pipe is arranged on the inner wall of the retaining ring, the ventilation pipe is filled with a dry filler, and the mineral insulation outer layer is filled with a dry filler. And the retaining ring is filled with flame-retardant filler and buffer filler. According to the utility model, the cable can be buffered when the cable is extruded by external pressure, thereby preventing an internal sheath and a copper core of the cable from being damaged, and improving practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a novel copper core sheathed mineral insulated cable. Background Art

[0002] Mineral insulated cable is a cable that wraps a copper conductor core with a copper sheath and uses magnesium oxide powder as an inorganic insulating material to isolate the conductor and the sheath. The outermost layer can be selected as required.

[0003] After searching, a Chinese patent (application number is "201320034341.1") discloses "a new type of copper core copper sheath mineral insulated cable". The above-mentioned cable includes a copper core conductor, an inner insulating layer is arranged on the outside of the copper core conductor, a mica tape is coated on the outside of the inner insulating layer, an inner sheath layer is arranged on the outside of the mica tape, and a shielding layer is arranged on the inner sheath layer. The above-mentioned structure constitutes a cable core, and the outer layers of several cable cores are coated with a copper sheath layer, an armor layer is arranged on the outside of the copper sheath layer, an anti-corrosion sheath layer is arranged on the outside of the armor layer, and a layer of insulating paint is coated on the outside of the anti-corrosion sheath layer. Magnesium oxide crystal powder is filled between the cable core and the copper sheath layer. However, during the use of the above-mentioned cable, no buffer structure is arranged inside the cable, which causes the internal sheath and copper core to be easily damaged when the cable is subjected to external pressure, and the practicality is low. Utility Model Content

[0004] The utility model provides a novel copper core sheathed mineral insulated cable, which solves the problem that the comparative document does not have a buffer structure inside the cable, which makes it easy for the internal sheath and copper core to be damaged when the cable is subjected to external pressure, and has low practicality.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A novel copper core sheathed mineral insulated cable comprises a mineral insulation outer layer and a plurality of copper cores, wherein the outer sides of the plurality of copper cores are provided with sheaths, and the outer sides of the plurality of sheaths are provided with mica tapes, and the outer sides of the plurality of mica tapes are provided with insulating inner layers, a retaining ring is provided inside the mineral insulation outer layer, and a ventilation pipe is provided on the inner wall of the retaining ring, the ventilation pipe is filled with dry filler, and the retaining ring is filled with flame retardant filler and buffer filler.

[0007] Preferably, a flame retardant coating layer is sprayed on the outer wall of the mineral insulation outer layer, and a corrosion resistant coating is sprayed on the outer wall of the flame retardant coating layer.

[0008] Preferably, the copper core is composed of multiple groups of copper wires twisted together, and several mica tapes are respectively wound around the outer wall of the copper core, several sheaths are respectively sleeved on several sheath outer walls, and several insulating inner layers are respectively sleeved on several sheath outer walls.

[0009] Preferably, a filling cavity is provided on the outer wall of the retaining ring, and openings distributed at equal distances are provided on the inner wall of the filling cavity. A through hole is provided on the outer wall at the center of the retaining ring, and the ventilation pipe is sleeved in the through hole.

[0010] Through the above scheme, the insulating outer layer, the insulating inner layer and the sheath are fixed by the retaining ring, and the position of the insulating inner layer and the copper core is kept fixed. At the same time, when the insulating outer layer is squeezed by pressure, the retaining ring buffers the insulating inner layer and the sheath.

[0011] Preferably, a plurality of isolation rings are fixedly provided in the filling cavity, and ventilation holes are opened on the outer walls of the plurality of isolation rings.

[0012] Preferably, the flame retardant filler is filled between the outer inner wall of the filling cavity and the isolation ring, and the buffer filler is filled between the inner inner wall of the inner layer of the filling cavity and the isolation ring.

[0013] Through the above solution, when the insulating outer layer is squeezed by pressure, the retaining ring, the flame-retardant filler, the isolation ring and the buffer filler cooperate with each other to buffer the insulating outer layer.

[0014] The beneficial effects of the utility model are:

[0015] A retaining ring, a ventilation pipe, a dry filler, an isolating ring, a flame retardant filler and a buffer filler are provided. The retaining ring fixes the insulating outer layer, the insulating inner layer and the sheath, and keeps the positions of the insulating inner layer and the copper core fixed. At the same time, when the insulating outer layer is squeezed by pressure, the retaining ring cooperates with the flame retardant filler, the isolating ring and the buffer filler to buffer the insulating outer layer. At the same time, the dry filler dries the air in the small space inside the insulating outer layer to prevent the humid air from corroding the internal sheath and the copper core. It can buffer the cable when the cable is squeezed by external pressure to prevent the internal sheath and the copper core of the cable from being damaged, thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main three-dimensional structure of a novel copper core sheathed mineral insulated cable proposed by the utility model.

[0017] Figure 2 The utility model proposed Figure 1 Schematic diagram of the structure at point A in the middle.

[0018] Figure 3 The utility model is a partial cross-sectional view of a novel copper core sheathed mineral insulated cable.

[0019] In the figure: 1. Mineral insulation outer layer; 2. Copper core; 3. Mica tape; 4. Sheath; 5. Insulation inner layer; 6. Retaining ring; 7. Ventilation pipe; 8. Dry filler; 9. Isolation ring; 10. Flame retardant filler; 11. Buffer filler; 12. Flame retardant coating layer; 13. Corrosion-resistant coating. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Example 1, reference Figure 1-3 A novel copper core sheathed mineral insulated cable comprises a mineral insulating outer layer 1 and three copper cores 2 which are formed by twisting a plurality of groups of copper wires with each other, the three copper cores 2 are all wound with mica tapes 3 on the outside, the three mica tapes 3 are all sleeved with sheaths 4 on the outside, the three sheaths 4 are all sleeved with insulating inner layers 5 on the outside, a retaining ring 6 is sleeved inside the mineral insulating outer layer 1, a filling cavity is provided on the outer wall of the retaining ring 6, openings are provided on the inner wall of the filling cavity at equal distances, a through hole is provided on the outer wall at the center of the retaining ring 6, a ventilation pipe 7 is sleeved in the through hole, and a The ventilation pipe 7 is made of a hose material and is filled with a dry filler 8. A plurality of isolation rings 9 are fixed in the filling cavity, and ventilation holes are opened on the outer walls of the isolation rings 9. The retaining ring 6 is filled with a flame retardant filler 10 and a buffer filler 11. The flame retardant filler 10 is filled between the inner wall of the outer layer of the filling cavity and the isolation ring 9, and the buffer filler 11 is filled between the inner wall of the inner layer of the filling cavity and the isolation ring 9. A flame retardant coating layer 12 is sprayed on the outer wall of the mineral insulation outer layer 1, and a corrosion-resistant coating 13 is sprayed on the outer wall of the flame retardant coating layer 12.

[0022] Working principle: The retaining ring 6 fixes the insulating outer layer 1, the insulating inner layer 5 and the mica tape 3, and keeps the positions of the insulating inner layer 5 and the copper core 2 fixed. At the same time, when the insulating outer layer 1 is squeezed by external pressure, the retaining ring 6 cooperates with the isolation ring 9, the flame retardant filler 10 and the buffer filler 11 to buffer the insulating outer layer 1. At the same time, the dry filler 8 dries the air in the small space inside the insulating outer layer 1 to prevent the humid air from corroding the internal sheath 4 and the copper core 2.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A novel copper core sheathed mineral insulated cable, comprising a mineral insulating outer layer (1) and a plurality of copper cores (2), characterized in that: A plurality of the copper cores (2) are provided with mica tapes (3) on the outside, and a plurality of the mica tapes (3) are provided with sheaths (4) on the outside, and an insulating inner layer (5) is provided on the outside of a plurality of the sheaths (4). A retaining ring (6) is provided inside the mineral insulating outer layer (1), and a ventilation pipe (7) is provided on the inner wall of the retaining ring (6). The ventilation pipe (7) is filled with dry filler (8), and the retaining ring (6) is filled with flame retardant filler (10) and buffer filler (11).

2. A novel copper core sheathed mineral insulated cable according to claim 1, characterized in that: A flame retardant coating layer (12) is sprayed on the outer wall of the mineral insulation outer layer (1), and a corrosion resistant coating (13) is sprayed on the outer wall of the flame retardant coating layer (12).

3. A novel copper core sheathed mineral insulated cable according to claim 1, characterized in that: The copper core (2) is composed of a plurality of groups of copper wires twisted together, and a plurality of mica tapes (3) are respectively wound around the outer wall of the copper core (2), a plurality of sheaths (4) are respectively sleeved on the outer walls of a plurality of mica tapes (3), and a plurality of insulating inner layers (5) are respectively sleeved on the outer walls of a plurality of sheaths (4).

4. A novel copper core sheathed mineral insulated cable according to claim 1, characterized in that: A filling cavity is provided on the outer wall of the retaining ring (6), and openings are provided on the inner wall of the filling cavity at equal distances. A through hole is provided on the outer wall at the center of the retaining ring (6), and the ventilation pipe (7) is sleeved in the through hole.

5. A novel copper core sheathed mineral insulated cable according to claim 4, characterized in that: A plurality of isolation rings (9) are fixedly arranged in the filling cavity, and ventilation holes are provided on the outer walls of the plurality of isolation rings (9).

6. A novel copper core sheathed mineral insulated cable according to claim 5, characterized in that: The flame retardant filler (10) is filled between the outer inner wall of the filling cavity and the isolation ring (9), and the buffer filler (11) is filled between the inner wall of the inner layer of the filling cavity and the isolation ring (9).

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