Mineral insulated fireproof cable

Abstract

The utility model discloses a mineral insulated fireproof cable, which relates to the technical field of cables and wires, and comprises two groups of conductive inner cores, the outer surfaces of the two groups of conductive inner cores are jointly provided with a tensile mechanism, the tensile mechanism comprises a connecting sleeve, the inner wall of the connecting sleeve is fixedly provided with an elastic strip, and the outer surface of the elastic strip is fixedly provided with two groups of filling layers. The outer surface of each filling layer makes contact with the inner surface of the connecting sleeve, nylon wires arranged at equal intervals are fixedly installed on the inner wall of the elastic strip, two sets of buffering strips are fixedly installed on the inner wall of the connecting sleeve, a fireproof layer is fixedly installed on the outer surface of the connecting sleeve, and a fireproof coating is arranged on the outer surface of the fireproof layer. According to the utility model, the conductive inner core and the anti-stretching mechanism are matched for use, so that the purpose of improving the anti-stretching capability of the cable in use is achieved, the phenomenon that the cable is broken and torn in use is avoided as much as possible, the use strength of the cable is improved, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cables and wires, and particularly relates to a mineral insulated fireproof cable. Background Art

[0002] A mineral insulated cable is a cable with a copper sheath wrapping a copper core conductor wire and using magnesium oxide powder as an inorganic insulating material to isolate the conductor from the sheath, also known as a fireproof cable or a copper core copper sheath magnesium oxide insulated cable.

[0003] According to the utility model with the authorization announcement number CN206225046U, a mineral insulated fireproof cable is disclosed, including: a plurality of copper conductors; an inorganic mineral insulating layer covering each of the copper conductors; a cross-linked polyethylene insulating layer covering the inorganic mineral insulating layer; a ceramized polyolefin filling and an inner sheath covering all the cross-linked polyethylene insulating layers; a polyolefin sheath covering the ceramized polyolefin filling and the inner sheath.

[0004] Although this device can quickly form a hard armor body in case of fire or high temperature, effectively preventing fire and flame retardance, when this device is in use, due to the relatively hard texture of the armor body of this device, it will cause the phenomenon of reduced overall flexibility of the cable, and further the compressive and tensile resistance effects of the cable become worse, making the cable prone to breakage and tearing; for this reason, we provide a mineral insulated fireproof cable to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to make up for the deficiencies of the prior art and provide a mineral insulated fireproof cable.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a mineral insulated fireproof cable, including two groups of conductive inner cores, an anti-tensile mechanism is jointly arranged on the outer surfaces of the two groups of conductive inner cores, the anti-tensile mechanism includes a connecting sleeve, elastic strips are fixedly installed on the inner wall of the connecting sleeve, two groups of filling layers are fixedly installed on the outer surface of the elastic strips, the outer surface of each filling layer is in contact with the inner surface of the connecting sleeve, nylon wires are fixedly installed on the inner wall of the elastic strips at equal intervals, two groups of buffer strips are fixedly installed on the inner wall of the connecting sleeve, a fireproof layer is fixedly installed on the outer surface of the connecting sleeve, and a fireproof coating is arranged on the outer surface of the fireproof layer.

[0007] Furthermore, an inorganic mineral insulating layer is fixedly installed on the outer surface of each conductive inner core, and a shielding layer is fixedly installed on the outer surface of each inorganic mineral insulating layer.

[0008] Furthermore, a wear-resistant coating is arranged on the outside of the connecting sleeve, and a wear-resistant sleeve is arranged inside the wear-resistant coating.

[0009] Furthermore, an insect repellent coating is provided inside the wear-resistant sleeve, and a bitter foam layer is provided inside the insect repellent coating.

[0010] Furthermore, a waterproof coating is provided inside the bitter foam layer, and a waterproof cover is provided inside the waterproof coating.

[0011] Furthermore, a low-smoke zero-halogen sleeve is provided inside the waterproof sleeve, and the inner wall of the low-smoke zero-halogen sleeve is fixedly connected to the outer surface of the fire-retardant coating.

[0012] Compared with the prior art, this mineral insulated fire-resistant cable has the following beneficial effects:

[0013] The utility model is provided with a conductive inner core, a connecting sleeve, a filling layer, an elastic strip and a nylon thread, and utilizes the elastic force of the filling layer, the elastic strip and the nylon thread to increase the overall tensile resistance of the cable; a buffer strip is provided, and utilizes the elastic force of the buffer itself and the gap between the buffer and the connecting sleeve to increase the compressive resistance of the cable, so that when the cable is impacted from the outside, the cable is prevented from breaking as much as possible, thereby further increasing the use strength of the cable; a fireproof layer and a fireproof coating are provided, and a fireproof material with a certain softness is selected to prevent the cable from having a hard texture as much as possible, thereby further increasing the tensile resistance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the conductive inner core of the utility model;

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the filling layer of the utility model;

[0016] Figure 3 It is a three-dimensional structural schematic diagram of a cross-sectional view of the connecting sleeve of the utility model;

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the cross-sectional view of the fireproof layer of the utility model.

[0018] In the figure: 1. conductive inner core; 2. anti-stretching mechanism; 201. connecting sleeve; 202. filling layer; 203. elastic strip; 204. nylon thread; 205. buffer strip; 206. fireproof layer; 207. fireproof coating; 208. inorganic mineral insulating layer; 209. shielding layer; 210. wear-resistant coating; 211. wear-resistant sleeve; 212. insect repellent coating; 213. bitter foam layer; 214. waterproof coating; 215. waterproof sleeve; 216. low-smoke halogen-free sleeve. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] This embodiment provides a mineral insulated fireproof cable, which is used to achieve the purpose of increasing the anti-stretching ability of the cable when in use by providing a conductive inner core 1 and an anti-stretching mechanism 2.

[0021] Please refer to Figures 1-4 A mineral insulated fireproof cable comprises two groups of conductive inner cores 1. The outer surfaces of the two groups of conductive inner cores 1 are jointly provided with an anti-stretching mechanism 2. The anti-stretching mechanism 2 comprises a connecting sleeve 201. An inorganic mineral insulating layer 208 is fixedly installed on the outer surface of each conductive inner core 1. A shielding layer 209 is fixedly installed on the outer surface of each inorganic mineral insulating layer 208. The inorganic mineral insulating layer 208 is wrapped with insulating mica and is wrapped around the outer surface of the conductive inner core 1, thereby insulating the conductive inner core 1. The shielding layer 209 is a compressed linear low-density polyvinyl chloride cross-linked material layer, so that the conductive inner cores 1 do not interfere with each other.

[0022] Please refer to Figure 2 and Figure 4 An elastic strip 203 is fixedly installed on the inner wall of the connecting sleeve 201. The elastic strip 203 is made of organic polymer fiber material and has good tensile resistance. A wear-resistant coating 210 is arranged on the outside of the connecting sleeve 201. A wear-resistant sleeve 211 is arranged inside the wear-resistant coating 210. The wear-resistant coating 210 is sprayed with epoxy anti-corrosion paint, and the wear-resistant sleeve 211 is composed of glass fiber and resin. The installation of the wear-resistant coating 210 and the wear-resistant sleeve 211 increases the wear resistance of the cable and avoids the cable from being broken when it rubs on the ground.

[0023] Please refer to Figure 1 , Figure 2 and Figure 4 Two groups of filling layers 202 are fixedly installed on the outer surface of the elastic strip 203, and the outer surface of each filling layer 202 is in contact with the inner surface of the connecting sleeve 201. The filling layer 202 is made of glass fiber. Glass fiber has the advantages of being non-flammable, anti-corrosive, and having good heat insulation properties, and has high tensile strength, which can improve the tensile strength of the cable. An insect repellent coating 212 is arranged inside the wear-resistant sleeve 211, and a bitter foam layer 213 is arranged inside the insect repellent coating 212. The bitter foam layer 213 is made of a fiber layer filled with multiple groups of insect repellent pellets. The insect repellent coating 212 is sprayed on the outer surface of the bitter foam layer 213 with insect repellent. The installation of the insect repellent coating 212 and the bitter foam layer 213 plays a role in expelling animals such as insects and rats that gnaw on the cable, thereby avoiding the phenomenon that the conductive inner core 1 is exposed to the outside world due to the insects and rats and other animals gnawing on the cable as much as possible.

[0024] Please refer to Figure 2 and Figure 4The inner wall of the elastic strip 203 is fixedly installed with nylon threads 204 arranged at equal distances, and the inner wall of the connecting sleeve 201 is fixedly installed with two groups of buffer strips 205, which are made of organic polymer fiber material. The interior of the bitter foam layer 213 is provided with a waterproof coating 214, and the interior of the waterproof coating 214 is provided with a waterproof sleeve 215. The waterproof sleeve 215 is an extruded polyethylene water-blocking layer and a moisture-absorbing cushion layer wrapped inside the cable. The waterproof coating 214 is sprayed on the outer surface of the waterproof sleeve 215 with synthetic polymer, polymer and asphalt, polymer and cement as the main film-forming materials. The installation of the waterproof sleeve 215 and the waterproof coating 214 plays a role in waterproofing the conductive inner core 1, thereby avoiding the conductive inner core 1 from contacting with external water sources as much as possible.

[0025] Please refer to Figure 4 A fireproof layer 206 is fixedly installed on the outer surface of the connecting sleeve 201, and a fireproof coating 207 is arranged on the outer surface of the fireproof layer 206. The fireproof layer 206 is made of fireproof clay, which can achieve the cable having fireproof and heat-insulating properties while having a certain flexibility. The fireproof coating 207 is made of tert-acrylic emulsion water-based material, fire retardant and plasticizer, so that the cable has good fireproof performance. A low-smoke halogen-free sleeve 216 is arranged inside the waterproof sleeve 215, and the inner wall of the low-smoke halogen-free sleeve 216 is fixedly connected to the outer surface of the fireproof coating 207. The low-smoke halogen-free sleeve 216 is made of expandable low-smoke halogen-free flame-retardant polyolefin refractory material, so that the cable will not produce thick smoke when burning in a fire. It is low-smoke, non-toxic, and harmless to the human body, which further increases the practicality of the device.

[0026] Working principle: When the cable is impacted by the outside world, the elastic force of the buffer strip 205 made of organic polymer fiber material and the gap between it and the connecting sleeve 201 provide a certain buffering effect on the conductive inner core 1, thereby increasing the compression resistance of the cable. The elastic force of the elastic strip 203 made of organic polymer fiber material, the filling layer 202 made of glass fiber and the nylon thread 204 make the cable have good tensile resistance, thereby minimizing the cable breakage during traction and further increasing the service life of the cable. When a fire occurs outside, the fireproof layer 206 made of fireproof clay and the fireproof coating 207 made of tert-acrylic emulsion water-based material, fire retardant and plasticizer are used to block the flame, thereby minimizing the flame from burning the cable and causing the conductive inner core 1 to explode. The phenomenon of being exposed to the outside world increases the practicality of the device. At the same time, the wear-resistant coating 210 sprayed with epoxy anti-corrosion paint and the wear-resistant sleeve 211 composed of glass fiber and resin are used to increase the wear resistance of the cable, thereby avoiding the phenomenon of cable skin breakage as much as possible. The bitter foam layer 213 made of a fiber layer filled with multiple groups of insect repellent pellets and the insect repellent coating 212 sprayed on the outer surface of the bitter foam layer 213 by the insect repellent can drive away insects and rodents near the cable. The waterproof sleeve 215 made of an extruded polyethylene water-blocking layer and a moisture-absorbing cushion layer and the waterproof coating 214 sprayed on the outer surface of the waterproof sleeve 215 with synthetic high molecular polymer, high molecular polymer and asphalt, high molecular polymer and cement as main film-forming substances can increase the waterproof effect of the cable and ensure the dryness of the conductive inner core 1.

[0027] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mineral insulated fireproof cable, comprising two groups of conductive inner cores (1), characterized in that: An anti-tensile mechanism (2) is commonly arranged on the outer surfaces of the two groups of the conductive inner cores (1). The anti-tensile mechanism (2) includes a connecting sleeve (201). An elastic strip (203) is fixedly installed on the inner wall of the connecting sleeve (201). Two groups of filling layers (202) are fixedly installed on the outer surface of the elastic strip (203). The outer surface of each filling layer (202) is in contact with the inner surface of the connecting sleeve (201). Nylon filaments (204) arranged at equal distances are fixedly installed on the inner wall of the elastic strip (203). Two groups of buffer strips (205) are fixedly installed on the inner wall of the connecting sleeve (201). A fireproof layer (206) is fixedly installed on the outer surface of the connecting sleeve (201). A fireproof coating (207) is arranged on the outer surface of the fireproof layer (206).

2. A mineral insulated fire resistant cable according to claim 1, characterized in that: An inorganic mineral insulation layer (208) is fixedly installed on the outer surface of each conductive inner core (1). A shielding layer (209) is fixedly installed on the outer surface of each inorganic mineral insulation layer (208).

3. A mineral insulated fireproof cable according to claim 1, characterized in that: A wear-resistant coating (210) is arranged on the outside of the connecting sleeve (201). A wear-resistant sleeve (211) is arranged inside the wear-resistant coating (210).

4. The mineral insulated fire-resistant cable according to claim 3, characterized in that: An insect-repellent coating (212) is arranged inside the wear-resistant sleeve (211). A bitter foam layer (213) is arranged inside the insect-repellent coating (212).

5. A mineral insulated fireproof cable according to claim 4, characterized in that: A waterproof coating (214) is arranged inside the bitter foam layer (213). A waterproof sleeve (215) is arranged inside the waterproof coating (214).

6. A mineral insulated fireproof cable according to claim 5, characterized in that: A low-smoke and halogen-free sleeve (216) is arranged inside the waterproof sleeve (215). The inner wall of the low-smoke and halogen-free sleeve (216) is fixedly connected to the outer surface of the fireproof coating (207).

Images